CN108768176A

CN108768176A - Three level Boost circuits of one kind and inversion system

Info

Publication number: CN108768176A
Application number: CN201810726495.4A
Authority: CN
Inventors: 王鹏; 别伟; 张兵; 文鹏; 李春
Original assignee: Sungrow Power Supply Co Ltd
Current assignee: Sungrow Power Supply Co Ltd
Priority date: 2018-07-04
Filing date: 2018-07-04
Publication date: 2018-11-06
Anticipated expiration: 2038-07-04
Also published as: CN108768176B

Abstract

The present invention provides three level Boost circuits of one kind and inversion system, and Boost circuit includes third switching tube, and the first end of third switching tube connects the anode of power supply, and the second end of third switching tube passes through the 5th capacitance connection first node；Third switching tube includes anti-paralleled diode；When Boost circuit works, third switching tube is complementary with the first switch tubulose state；When Boost circuit does not work, third switching tube is closed.The circuit is realized by the on or off of first switch pipe and second switch pipe boosts the input voltage of the circuit, and, the circuit also connects sizable second capacitance of capacitance and the 5th capacitance, make the second capacitance and the 5th capacitance series average-voltage, since first switch pipe and the 5th capacitance are in parallel, and second switch pipe is in parallel with the second capacitance, is pressed to make first switch pipe and second switch pipe realize.

Description

Three level Boost circuits of one kind and inversion system

Technical field

The present invention relates to power electronics fields, more particularly to a kind of three level Boost circuits and inversion system.

Background technology

With the growth of energy-consuming, the deterioration of ecological environment and the raising of mankind's environmental consciousness, solar energy is as one The green energy resource of kind sustainable development and efficient pollution-free, is increasingly taken seriously.There is high development in applied solar energy technology The technology of future is photovoltaic technology.Photovoltaic technology is a kind of technology directly converting the solar into electric energy.

Solar energy can be converted to direct current energy by photovoltaic cell using photovoltaic effect, still, due to single light It is limited to lie prostrate the electric current that battery provides, multiple photovoltaic cells are usually connected and composed into photovoltaic array in practical applications.Photovoltaic array The direct current of generation need using inverter by DC conversion at alternating current for load use or it is grid-connected.

In order to improve the working range of inverter input voltage, MPPT maximum power point tracking (Maximum Power are improved Point Tracking, MPPT) efficiency, Boost circuit is used usually in inverter, using Boost circuit by photovoltaic array Output voltage is supplied to inverter after increasing.

However, when the input voltage of Boost circuit is higher, the voltage stress of the single switching transistor in Boost circuit has Limit, it is therefore desirable to be connected using two switching tubes, still, when Boost circuit works, how realize that two switching tubes are pressed then It is the technical barrier that Boost circuit faces.

Invention content

Of the existing technology in order to solve the problems, such as, the present invention provides three level Boost circuits of one kind and inversion system, energy Enough make in three level Boost circuits two switching tubes bear voltage realization to press.

To achieve the goals above, the present invention uses following technical scheme：

A kind of three level Boost circuits, including：First switch pipe, second switch pipe, the first inductance, the second capacitance, third Capacitance, the 4th capacitance, the 5th capacitance, the first diode, the second diode and third switching tube；The capacitance of second capacitance and The capacitance of 5th capacitance is equal；

The input terminal of the Boost circuit connects the first capacitance；First capacitance is connected in parallel on both ends of power；

The first end of the first switch pipe connects the anode of the power supply, the second end connection of the first switch pipe the One node；The first end of the second switch pipe connects the first node, and the second end of the second switch pipe is described in The cathode of power supply described in first inductance connection；

The first end of the third capacitance connects the anode of the power supply, the second section of second end connection of the third capacitance Point；The first end of 4th capacitance connects the second node, and the second end of the 4th capacitance connects the Boost circuit Output negative pole；

The first end of second capacitance connects the first node, and the second end of second capacitance connects third section Point；

The anode of first diode connects the third node, the cathode connection described second of first diode The second end of switching tube；The anode of second diode connects the output negative pole of the Boost circuit, second diode Cathode connect the third node；

The first end of the third switching tube connects the anode of the power supply, and the second end of the third switching tube passes through institute State first node described in the 5th capacitance connection；The third switching tube includes anti-paralleled diode；

When the Boost circuit work, the third switching tube is complementary with the first switch tubulose state；The Boost When circuit does not work, the third switching tube is closed.

Optionally, the third switching tube is controlled tr tube, and the controlled tr tube anti-paralleled diode is described controllable Switching tube is：IGBT, MOSFET, JFET or relay.

Optionally, in the three level Boost circuits, when the first switch pipe is closed, second switch pipe disconnects, When third switching tube disconnects, current path is：The-the first electricity of the anode of power supply-the-the first diode of the-the second capacitance of first switch pipe Sense；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the 5th capacitance and the second capacitance The sum of voltage when being more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are respectively：Power supply Anode-third capacitance the-the four capacitance the-the second diode the-the first inductance of the-the first diode；Second the-the five capacitances of capacitance-third Switching tube-third capacitance the-the second diode of the-the four capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the 5th capacitance and the second capacitance The sum of voltage when being less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The anode of power supply-third switch Manage-the five capacitance the-the second capacitance the-the first inductance of the-the first diode；

When the first switch pipe disconnects, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply Anode-third capacitance the-the four capacitance the-the second diode the-the first inductance of the-the first diode；

When the first switch pipe disconnects, second switch pipe is closed, and third switching tube is closed, the 5th capacitance and the second capacitance The sum of voltage when being more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are respectively：Power supply The-the second capacitance of anode-third capacitance the-the second diode of the-the four capacitance-the-the first inductance of second switch pipe；Second capacitance-the five Capacitance-third switching tube-third capacitance the-the second diode of the-the four capacitance；

When the first switch pipe disconnects, second switch pipe is closed, and third switching tube is closed, the 5th capacitance and the second capacitance The sum of voltage when being less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The anode of power supply-third switch Manage the-the five capacitances-the-the first inductance of second switch pipe；

When the first switch pipe disconnects, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply The-the second capacitance of anode-third capacitance the-the second diode of the-the four capacitance-the-the first inductance of second switch pipe；

When the first switch pipe is closed, second switch pipe is closed, and third switching tube disconnects, and current path is：Power supply Anode-first switch pipe-the-the first inductance of second switch pipe.

Optionally, the three level Boost circuits further include：4th diode；

The anode of 4th diode connects the output negative pole of the Boost circuit, the cathode of the 4th diode Connect the cathode of the power supply.

The present invention also provides another technical solutions：

The input terminal of the Boost circuit connects power supply；First capacitance is connected in parallel on the both ends of the power supply；

The first end of the first switch pipe passes through the anode of power supply described in first inductance connection, the first switch The second end of pipe connects first node；The first end of the second switch pipe connects the first node, the second switch pipe Second end connect the cathode of the power supply；

The first end of the third capacitance connects the output cathode of the Boost circuit, and the second end of the third capacitance connects Connect second node；The first end of 4th capacitance connects the second node, and the second end connection of the 4th capacitance should The output negative pole of Boost circuit；

The first end of second capacitance connects fourth node, and the second end of second capacitance connects first node；

The anode of first diode connects the first end of the first switch pipe, and the cathode of first diode connects Connect the fourth node；The anode of second diode connects the fourth node, the cathode connection of second diode The output cathode of the Boost circuit；

The first end of the third switching tube connects the first node, and the second end of the third switching tube is described in The cathode of power supply described in 5th capacitance connection；The third switching tube includes anti-paralleled diode；

Optionally, in the three level Boost circuits, when the first switch pipe is closed, second switch pipe disconnects, Third switching tube is closed, and the sum of voltage of the second capacitance and the 5th capacitance is more than the sum of the voltage of third capacitance and the 4th capacitance When, corresponding two current paths are respectively：Two or two pole of the-the first inductance of anode of power supply-the-the second capacitance of first switch pipe-the The-the four capacitance of pipe-third capacitance；The-the four electricity of the-the second diode of five capacitances-third the-the second capacitance of switching tube-third capacitance Hold；

When the first switch pipe is closed, second switch pipe disconnects, and third switching tube is closed, the second capacitance and the 5th capacitance The sum of voltage when being less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The-the first inductance of anode-of power supply The-the five capacitance of first switch pipe-third switching tube；

When the first switch pipe is closed, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply The-the first inductance of anode-the-the second diode of the-the second capacitance of first switch pipe-the-the four capacitance of third capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the second capacitance and the 5th capacitance The sum of voltage when being more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are：The anode-of power supply First the-the second diode of the-the first diode of inductance-the-the four capacitance of third capacitance；The-the second electricity of five capacitances-third switching tube Hold the-the second diode-third the-the four capacitance of capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the second capacitance and the 5th capacitance The sum of voltage when being less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The-the first inductance of anode-of power supply The-the five capacitance of first the-the second capacitance of diode-third switching tube；

When the first switch pipe disconnects, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply The-the second diode of anode the-the first diode of the-the first inductance-the-the four capacitance of third capacitance；

When the first switch pipe disconnects, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply The-the second capacitance of anode the-the first diode of the-the first inductance-second switch pipe；

When the first switch pipe is closed, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply The-the first inductance of anode-first switch pipe-second switch pipe-power supply cathode.

Optionally, the three level Boost circuits further include：4th diode；

The anode of 4th diode connects the anode of the power supply, described in the cathode connection of the 4th diode The output cathode of Boost circuit.

The present invention also provides a kind of inversion systems, including three above-mentioned level Boost circuits, further include：Photovoltaic array And inverter；

The photovoltaic array connects the defeated of the three level Boosts circuit as power supply, the output end of the photovoltaic array Enter end；

The output end of the three level Boosts circuit connects the input terminal of the inverter；

The three level Boosts circuit, the voltage for exporting the photovoltaic array boost；

The inverter, for being that alternating current is supplied to electricity by the DC inverter of the three level Boosts circuit output Net or load.

Compared with prior art, the present invention has at least the following advantages：

The present invention provides a kind of three level Boost circuits, which includes：First switch pipe, second switch pipe, first Inductance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the first diode, the second diode and third switching tube；Institute The capacitance of the capacitance and the 5th capacitance of stating the second capacitance is equal；The input terminal of the Boost circuit connects the first capacitance；Described One capacitance is connected in parallel on both ends of power；The first end of the first switch pipe connects the anode of the power supply, the first switch pipe Second end connect first node；The first end of the second switch pipe connects the first node, the second switch pipe The cathode that second end passes through power supply described in first inductance connection；The first end of the third capacitance is connecting the power supply just The second end of pole, the third capacitance connects second node；The first end of 4th capacitance connects the second node, described The second end of 4th capacitance connects the output negative pole of the Boost circuit；The first end of second capacitance connects the first segment The second end of point, second capacitance connects third node；The anode of first diode connects the third node, described The cathode of first diode connects the second end of the second switch pipe；The anode of second diode connects the Boost The cathode of the output negative pole of circuit, second diode connects the third node；The first end of the third switching tube connects The anode of the power supply is connect, the second end of the third switching tube passes through first node described in the 5th capacitance connection；It is described Third switching tube includes anti-paralleled diode；When the BOOST circuits work, the third switching tube and the first switch pipe State is complementary；When the BOOST circuits do not work, the third switching tube is closed.The circuit passes through first switch pipe and second The input voltage of the circuit is boosted in the on or off realization of switching tube, moreover, the circuit is also by capacitance sizableness The second capacitance and the 5th capacitance series connection so that the second capacitance and the 5th capacitance series average-voltage, due to first switch pipe and the 5th Capacitance is in parallel, and second switch pipe is in parallel with the second capacitance, is pressed to make first switch pipe and second switch pipe realize.

Description of the drawings

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments described in application, for those of ordinary skill in the art, without creative efforts, It can also be obtained according to these attached drawings other attached drawings.

Fig. 1 is a kind of traditional Boost circuit structural schematic diagram provided by the present application；

Fig. 2 is the three level Boost electrical block diagrams that the embodiment of the present application one provides；

Fig. 3 is the first working condition current path schematic diagram that the embodiment of the present application one provides；

Fig. 4 is the first sub- working condition current path signal of second of working condition that the embodiment of the present application one provides Figure；

Fig. 5 is the second sub- working condition current path signal of second of working condition that the embodiment of the present application one provides Figure；

Fig. 6 is the third working condition current path schematic diagram that the embodiment of the present application one provides；

Fig. 7 is the first sub- working condition current path signal of the 4th kind of working condition that the embodiment of the present application one provides Figure；

Fig. 8 is the second sub- working condition current path signal of the 4th kind of working condition that the embodiment of the present application one provides Figure；

Fig. 9 is the 5th kind of working condition current path schematic diagram that the embodiment of the present application one provides；

Figure 10 is the 6th kind of working condition current path schematic diagram that the embodiment of the present application one provides；

Figure 11 is the three level Boost electrical block diagrams that the embodiment of the present application two provides；

Figure 12 is the three level Boost electrical block diagrams that the embodiment of the present application three provides；

Figure 13 is the first sub- working condition current path signal of the first working condition that the embodiment of the present application three provides Figure；

Figure 14 is the second sub- working condition current path signal of the first working condition that the embodiment of the present application three provides Figure；

Figure 15 is second of working condition current path schematic diagram that the embodiment of the present application three provides；

Figure 16 is the first sub- working condition current path signal of the third working condition that the embodiment of the present application three provides Figure；

Figure 17 is the second sub- working condition current path signal of the third working condition that the embodiment of the present application three provides Figure；

Figure 18 is the 4th kind of working condition current path schematic diagram that the embodiment of the present application three provides；

Figure 19 is the 5th kind of working condition current path schematic diagram that the embodiment of the present application three provides；

Figure 20 is the 6th kind of working condition current path schematic diagram that the embodiment of the present application three provides；

Figure 21 is the three level Boost electrical block diagrams that the embodiment of the present application four provides；

Figure 22 is inversion system structural schematic diagram provided by the embodiments of the present application.

Specific implementation mode

Referring to Fig. 1, which is a kind of traditional Boost circuit structural schematic diagram provided by the present application.

The Boost circuit of Fig. 1 includes inductance L, metal-oxide-semiconductor M, diode D and capacitance C.

Boost circuit operation principle is：First, metal-oxide-semiconductor M is made to be in on-state, power supply V charges to inductance L, and power supply V It charges and powers to the load to capacitance C；Then, metal-oxide-semiconductor M is made to disconnect, due to the electric current retention performance of inductance, power supply V and inductance L It charges and powers to the load to capacitance C simultaneously, so as to improve capacitance both end voltage；Finally, the mistake of metal-oxide-semiconductor M break-makes is repeated Journey so that the voltage at capacitance both ends is improved to the input voltage of inverter.

However, when the input voltage of Boost circuit is higher, the voltage stress of the single switching transistor in Boost circuit has Limit, therefore, may be used two switching tubes in above-mentioned Boost circuit.But when Boost circuit works, how to realize two Switching tube is pressed, and is the technical barrier that Boost circuit faces.

In order to solve the problems, such as that above-mentioned Boost circuit exists, the embodiment of the present application provides a kind of three level Boosts electricity Road, the circuit include：First switch pipe, second switch pipe, the first inductance, the second capacitance, third capacitance, the 4th capacitance, the 5th Capacitance, the first diode, the second diode and third switching tube；The capacitance phase of the capacitance and the 5th capacitance of second capacitance Deng；The input terminal of the Boost circuit connects the first capacitance；First capacitance is connected in parallel on both ends of power；The first switch The first end of pipe connects the anode of the power supply, and the second end of the first switch pipe connects first node；The second switch The first end of pipe connects the first node, and the second end of the second switch pipe passes through power supply described in first inductance connection Cathode；The first end of the third capacitance connects the anode of the power supply, the second section of second end connection of the third capacitance Point；The first end of 4th capacitance connects the second node, and the second end of the 4th capacitance connects the Boost circuit Output negative pole；The first end of second capacitance connects the first node, and the second end of second capacitance connects third section Point；The anode of first diode connects the third node, and the cathode of first diode connects the second switch The second end of pipe；The anode of second diode connects the output negative pole of the Boost circuit, and second diode is born Pole connects the third node；The first end of the third switching tube connects the anode of the power supply, the third switching tube Second end passes through first node described in the 5th capacitance connection；The third switching tube includes anti-paralleled diode；It is described When Boost circuit works, the third switching tube is complementary with the first switch tubulose state；When the Boost circuit does not work, The third switching tube is closed.

Three level Boosts circuit provided by the present application includes：First switch pipe, second switch pipe, the first inductance, the second electricity Appearance, third capacitance, the 4th capacitance, the 5th capacitance, the first diode, the second diode and third switching tube.The circuit passes through The input voltage of the circuit is boosted in the realization of the on or off of one switching tube and second switch pipe, moreover, the circuit is also Sizable second capacitance of capacitance and the 5th capacitance are connected so that the second capacitance and the realization of the 5th capacitance are pressed, due to the One switching tube and the 5th capacitance are in parallel, and second switch pipe is in parallel with the second capacitance, to make first switch pipe and second switch Pipe realization is pressed.

In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist The every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.

Embodiment one：

Referring to Fig. 2, which is the three level Boost electrical block diagrams that the embodiment of the present application one provides.

Three level Boosts circuit provided by the embodiments of the present application, which is characterized in that including：First switch pipe Q1, second open Close pipe Q2, the first inductance L, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the first diode D1, the Two diode D2 and third switching tube Q3；The capacitance of the second capacitance C2 and the capacitance of the 5th capacitance C5 are equal；

The input terminal of the Boost circuit connects the first capacitance C1；The first capacitance C1 is connected in parallel on both ends of power；

The first end of the first switch pipe Q1 connects the anode of the power supply, and the second end of the first switch pipe Q1 connects Connect first node；The first end of the second switch pipe Q2 connects the first node, the second end of the second switch pipe Q2 The cathode of the power supply is connected by the first inductance L；

The first end of the third capacitance C3 connects the anode of the power supply, the second end connection of the third capacitance C3 the Two nodes；The first end of the 4th capacitance C4 connects the second node, and the second end connection of the 4th capacitance C4 should The output negative pole of Boost circuit；

The first end of the second capacitance C2 connects the first node, and the second end of the second capacitance C2 connects third Node；

The anode of the first diode D1 connects the third node, described in the cathode connection of the first diode D1 The second end of second switch pipe Q2；The anode of the second diode D2 connects the output negative pole of the Boost circuit, and described The cathode of two diode D2 connects the third node；

The first end of the third switching tube Q3 connects the anode of the power supply, and the second end of the third switching tube Q3 is logical Cross the 5th capacitance C5 connections first node；The third switching tube Q3 includes anti-paralleled diode；

When the Boost circuit work, the third switching tube Q3 is complementary with the first switch pipe Q1 states；It is described When Boost circuit does not work, the third switching tube Q3 is closed.

It should be noted that due to the second capacitance C2 and the 5th capacitance C5 series connection and capacitance is equal, first switch pipe Q1 with Second capacitance C2 is in parallel and second switch pipe Q2 is in parallel with the 5th capacitance C5, thus, when first switch pipe Q1 and second switch When pipe Q2 is disconnected, first switch pipe Q1 and second switch pipe Q2 are pressed.

The third switching tube Q3 is controlled tr tube, the controlled tr tube anti-paralleled diode, the controllable switch Guan Wei：IGBT, MOSFET, JFET or relay.

For example, third switching tube Q3 can be IGBT in Fig. 2, and need inverse parallel third diode D3.

Three level Boosts circuit provided by the embodiments of the present application has six kinds of working conditions, wherein the first working condition It is closed for first switch pipe Q1, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected；Second of working condition is opened for first Close pipe Q1 disconnections, second switch pipe Q2 is disconnected and third switching tube Q3 is closed；The third working condition is disconnected for first switch pipe Q1 It opens, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected；4th kind of working condition is that first switch pipe Q1 is disconnected, second opens Pipe Q2 is closed to be closed and third switching tube Q3 closures；5th kind of working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is closed It closes and third switching tube Q3 is disconnected；6th kind of working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is closed and third Switching tube Q3 is disconnected.

For the ease of those skilled in the art to three level Boosts circuit different working condition provided by the embodiments of the present application Understanding, the first working condition will be discussed in detail successively below to the 6th kind of working condition.

The first working condition：First switch pipe Q1 is closed, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected.

Referring to Fig. 3, which is the first working condition current path schematic diagram that the embodiment of the present application one provides.

When first switch pipe Q1 is closed, first switch pipe Q1 is equivalent to conducting wire, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit turn-on；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between first inductance L of two ends connection disconnects；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to disconnected Road, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnect.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is disconnected, when third switching tube Q3 is disconnected, electric current Path is：The anode of power supply-first switch pipe Q1- the second capacitance C2- the first diode the first inductance of D1- L.

Second of working condition：First switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is closed.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between first inductance L of two ends connection disconnects；When third switching tube Q3 is closed, third switching tube Q3, which is equivalent to, to be led Line, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit turn-on.

Three level Boost circuits under the working condition, according to the 5th capacitance C5 and the second capacitance C2 the sum of voltage with The relative size of the sum of the voltage of third capacitance C3 and the 4th capacitance C4 further comprises two seed work states, wherein second First sub- working condition of kind working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is closed It closes, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is more than the sum of the voltage of third capacitance C3 and the 4th capacitance C4；The Second sub- working condition of two kinds of working conditions is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 It is closed, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4.

First sub- working condition of second of working condition：

Referring to Fig. 4, which is the first sub- working condition electric current of second of working condition that the embodiment of the present application one provides Path schematic diagram.

The sum of voltage due to the 5th capacitance C5 and the second capacitance C2 is more than the voltage of third capacitance C3 and the 4th capacitance C4 The sum of, thus, the second capacitance C2 and the 5th capacitance C5 will be to third capacitance C3 and the 4th capacitance C4 electric discharges.Due to electric in the circuit Source is also third capacitance C3 and the 4th capacitance C4 chargings, thus in this state, this circuit includes two current paths.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the 5th electricity When holding voltage the sum of of the sum of the voltage of C5 and the second capacitance C2 more than third capacitance C3 and the 4th capacitance C4, corresponding two electricity Flow path is respectively：The 4th capacitance C4- the second diode the first diodes of D2- D1- first of the anode of power supply-third capacitance C3- Inductance L；The 4th the second diodes of capacitance C4- D2 of the 5th capacitance C5- third switching tube Q3- third capacitances C3- of second capacitance C2-.

Second sub- working condition of second of working condition：

Referring to Fig. 5, which is the second sub- working condition electric current of second of working condition that the embodiment of the present application one provides Path schematic diagram.

The sum of voltage due to the 5th capacitance C5 and the second capacitance C2 is less than the voltage of third capacitance C3 and the 4th capacitance C4 The sum of, thus, the second capacitance C2 and the 5th capacitance C5 need to charge, then power supply is the second capacitance C2 and the 5th capacitance C5 chargings.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the 5th electricity When holding voltage the sum of of the sum of the voltage of C5 and the second capacitance C2 less than third capacitance C3 and the 4th capacitance C4, current path is： The 5th capacitance C5- the second capacitance C2- the first diode the first inductance of D1- L of the anode of power supply-third switching tube Q3-.

The third working condition：First switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected.

Referring to Fig. 6, which is the third working condition current path schematic diagram that the embodiment of the present application one provides.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between first inductance L of two ends connection disconnects；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to disconnected Road, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnect.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, when third switching tube Q3 is disconnected, electric current Path is：The 4th capacitance C4- the second diode D2- the first diode the first inductance of D1- L of the anode of power supply-third capacitance C3-.

4th kind of working condition：First switch pipe Q1 is disconnected, second switch pipe Q2 is closed and third switching tube Q3 is closed.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is closed When, second switch pipe Q2 is equivalent to conducting wire, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit turn-on between first inductance L of two ends connection；When third switching tube Q3 is closed, third switching tube Q3, which is equivalent to, to be led Line, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit turn-on.

Three level Boost circuits under the working condition, according to the 5th capacitance C5 and the second capacitance C2 the sum of voltage with The relative size of the sum of the voltage of third capacitance C3 and the 4th capacitance C4 further comprises two seed work states, wherein second First sub- working condition of kind working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is closed and third switching tube Q3 is closed It closes, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is more than the sum of the voltage of third capacitance C3 and the 4th capacitance C4；The Second sub- working condition of two kinds of working conditions is that first switch pipe Q1 is disconnected, second switch pipe Q2 is closed and third switching tube Q3 It is closed, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4.

First sub- working condition of the 4th kind of working condition：

Referring to Fig. 7, which is the first sub- working condition electric current of the 4th kind of working condition that the embodiment of the present application one provides Path schematic diagram.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is closed, and third switching tube Q3 is closed, the 5th electricity When holding voltage the sum of of the sum of the voltage of C5 and the second capacitance C2 more than third capacitance C3 and the 4th capacitance C4, corresponding two electricity Flow path is respectively：The 4th capacitance C4- the second diode the second capacitances of D2- C2- second of the anode of power supply-third capacitance C3- are opened Close pipe the first inductance of Q2- L；The 4th capacitance C4- of the 5th capacitance C5- third switching tube Q3- third capacitances C3- of second capacitance C2- Two diode D2.

Second sub- working condition of the 4th kind of working condition：

Referring to Fig. 8, which is the second sub- working condition electric current of the 4th kind of working condition that the embodiment of the present application one provides Path schematic diagram.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is closed, and third switching tube Q3 is closed, the 5th electricity When holding voltage the sum of of the sum of the voltage of C5 and the second capacitance C2 less than third capacitance C3 and the 4th capacitance C4, current path is： The 5th capacitance C5- second switch pipe the first inductance of Q2- L of the anode of power supply-third switching tube Q3-.

5th kind of working condition：First switch pipe Q1 is disconnected, second switch pipe Q2 is closed and third switching tube Q3 is disconnected.

Referring to Fig. 9, which is the 5th kind of working condition current path schematic diagram that the embodiment of the present application one provides.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is closed When, second switch pipe Q2 is equivalent to conducting wire, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit turn-on between first inductance L of two ends connection；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to disconnected Road, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnect.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is closed, when third switching tube Q3 is disconnected, electric current Path is：The 4th capacitance C4- the second diode D2- the second capacitance C2- second switch pipes Q2- of the anode of power supply-third capacitance C3- First inductance L.

6th kind of working condition：First switch pipe Q1 is closed, second switch pipe Q2 is closed and third switching tube Q3 is disconnected.

Referring to Figure 10, which is the 6th kind of working condition current path schematic diagram that the embodiment of the present application one provides.

When first switch pipe Q1 is closed, first switch pipe Q1 is equivalent to conducting wire, then first switch pipe Q1 first ends connect Positive pole and first switch pipe Q1 second ends connection first node between circuit turn-on；When second switch pipe Q2 is closed When, second switch pipe Q2 is equivalent to conducting wire, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit turn-on between first inductance L of two ends connection；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to disconnected Road, then between the positive pole of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnect.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is closed, and third switching tube Q3 is disconnected, electric current road Diameter is：The anode of power supply-first switch pipe Q1- second switch pipe the first inductance of Q2- L.

According to the analysis of the working condition of the above three level Boosts circuit：When three level Boost circuits work, Electric current flows through the first inductance LL, then carries out different operations, Ke Yifang according to the size of the induced electromotive force on the first inductance LL Electricity can also accumulate induced electromotive force, can be with attonity.In addition, as the work of three level Boost circuits and third switching tube Q3 When closure, if the sum of voltage of the 5th capacitance C5 and the second capacitance C2 more than third capacitance C3 and the 4th capacitance C4 voltage it With then the 5th capacitance C5 and the second capacitance C2 is to third capacitance C3 and the 4th capacitance C4 electric discharges；If the 5th capacitance C5 and second The sum of voltage of capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4, then power supply is the 5th capacitance C5 and second Capacitance C2 chargings.However, the voltage of the second capacitance C2 is then the closure by first switch pipe Q1 or disconnects and second switch pipe The closure of Q2 disconnects control, due to the second capacitance C2 and the 5th capacitance C5 and power sources in parallel, thus, when the second capacitance C2's When voltage is controllable, the voltage of the 5th capacitance C5 is also controllable.

Three level Boosts circuit provided by the embodiments of the present application includes first switch pipe Q1, second switch pipe Q2, the first electricity Feel L, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the first diode D1, the second diode D2 and the Three switching tube Q3, and the capacitance of the second capacitance C2 and the capacitance of the 5th capacitance C5 are equal.The circuit by first switch pipe Q1 and The input voltage of the circuit is boosted in the on or off realization of second switch pipe Q2, moreover, the circuit is also big by capacitance Small comparable second capacitance C2 and the 5th capacitance C5 series connection so that the second capacitance C2 and the 5th capacitance C5 realizations are pressed, due to the One switching tube Q1 and the 5th capacitance C5 are in parallel, and second switch pipe Q2 is in parallel with the second capacitance C2, to make first switch pipe Q1 It is pressed with the Q2 realizations of second switch pipe.

Based on the three level Boost circuits that above example provides, which is also applied for Boost circuit to input voltage The application scenarios of low-loss transmission are carried out, following example provides a kind of three level Boost circuits, which can be to input electricity Pressure carries out low-loss transmission.

Embodiment two：

Referring to Figure 11, which is the three level Boost electrical block diagrams that the embodiment of the present application two provides.

Knot of the three level Boosts circuit provided by the present application in addition to the three level Boost circuits provided including embodiment one Outside structure, further include：4th diode D4；

The anode of the 4th diode D4 connects the output negative pole of the Boost circuit, the 4th diode D4's Cathode connects the cathode of the power supply.

The working condition of three level Boosts circuit provided by the embodiments of the present application, the six kinds of works provided in addition to embodiment one Make outside state, further includes the 7th kind of working condition.

The electric circuit characteristic of 7th kind of working condition is：First switch pipe Q1, second switch pipe Q2 and third switching tube Q3 are equal It disconnects, and the current path of the circuit is：Positive pole-the 4th diode D4 of the 4th capacitance C4- of third capacitance C3-.

The application scenarios of 7th kind of working condition are：The input voltage of Boost circuit is higher, meets the input electricity of inverter The requirement of pressure, thus, the voltage of power supply need not then boost, and only need to input inversion by the 4th diode D4 of Boost circuit Device.

Three level Boosts circuit provided by the embodiments of the present application further includes the 4th diode D4, when the input of Boost circuit When voltage reaches the height of the input voltage of inverter, when which is in seven working conditions, the electric current of power supply output will flow The 4th diode D4 through the circuit reaches inverter, effectively reduces loss, inverter efficiency is improved, to improve inverter Generated energy.

A kind of three level Boost circuits of anode altogether are provided based on above example, the embodiment of the present application also provides one Three level Boost circuits of the total cathode of kind, are described in detail below in conjunction with the accompanying drawings.

Embodiment three：

Referring to Figure 12, which is the three level Boost electrical block diagrams that the embodiment of the present application three provides.

Three level Boosts circuit provided by the present application includes：First switch pipe Q1, second switch pipe Q2, the first inductance L, Second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the first diode D1, the second diode D2 and third are opened Close pipe Q3；The capacitance of the second capacitance C2 and the capacitance of the 5th capacitance C5 are equal；

The input terminal of the Boost circuit connects power supply；First capacitance C1 is connected in parallel on the both ends of the power supply；

The first end of the first switch pipe Q1 connects the anode of the power supply by the first inductance L, and described first The second end of switching tube Q1 connects first node；The first end of the second switch pipe Q2 connects the first node, and described the The second end of two switching tube Q2 connects the cathode of the power supply；

The first end of the third capacitance C3 connects the output cathode of the Boost circuit, and the second of the third capacitance C3 End connection second node；The first end of the 4th capacitance C4 connects the second node, the second end of the 4th capacitance C4 Connect the output negative pole of the Boost circuit；

The first end of the second capacitance C2 connects fourth node, and the second end of the second capacitance C2 connects first segment Point；

The anode of the first diode D1 connects the first end of the first switch pipe Q1, the first diode D1's Cathode connects the fourth node；The anode of the second diode D2 connects the fourth node, the second diode D2 Cathode connect the output cathode of the Boost circuit；

The first end of the third switching tube Q3 connects the first node, and the second end of the third switching tube Q3 passes through The 5th capacitance C5 connects the cathode of the power supply；The third switching tube Q3 includes anti-paralleled diode；

When the BOOST circuits work, the third switching tube Q3 is complementary with the first switch pipe Q1 states；It is described When BOOST circuits do not work, the third switching tube Q3 is closed.

For example, third switching tube Q3 can be IGBT in Figure 12, and need inverse parallel third diode D3.

Three level Boosts circuit provided by the embodiments of the present application has six kinds of working conditions, wherein the first working condition It is closed for first switch pipe Q1, second switch pipe Q2 is disconnected and third switching tube Q3 is closed；Second of working condition is opened for first Close pipe Q1 closures, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected；The third working condition is disconnected for first switch pipe Q1 It opens, second switch pipe Q2 is disconnected and third switching tube Q3 is closed；4th kind of working condition is that first switch pipe Q1 is disconnected, second opens Pipe Q2 is closed to disconnect and the Q3 disconnections of third switching tube；5th kind of working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is closed It closes and third switching tube Q3 is disconnected；6th kind of working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is closed and third Switching tube Q3 is disconnected.

The first working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is disconnected and third switching tube Q3 is closed.

When first switch pipe Q1 is closed, first switch pipe Q1 is equivalent to conducting wire, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit turn-on；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between the power cathode of two ends connection disconnects；When third switching tube Q3 is closed, third switching tube Q3 is equivalent to conducting wire, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit turn-on.

Three level Boost circuits under the working condition, according to the 5th capacitance C5 and the second capacitance C2 the sum of voltage with The relative size of the sum of the voltage of third capacitance C3 and the 4th capacitance C4 further comprises two seed work states, wherein first First sub- working condition of kind working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is disconnected and third switching tube Q3 is closed It closes, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is more than the sum of the voltage of third capacitance C3 and the 4th capacitance C4；The A kind of second sub- working condition of working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is disconnected and third switching tube Q3 It is closed, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4.

First sub- working condition of the first working condition：

Referring to Figure 13, which is the first sub- working condition electric current of the first working condition that the embodiment of the present application three provides Path schematic diagram.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the second electricity When holding voltage the sum of of the sum of the voltage of C2 and the 5th capacitance C5 more than third capacitance C3 and the 4th capacitance C4, corresponding two electricity Flow path is respectively：Anode the-the first inductance L- first switch pipe Q1- the second capacitance C2- the second diode D2- third electricity of power supply Hold the 4th capacitance C4 of C3-；5th capacitance C5- third switching tube Q3- the second capacitance C2- the second diode D2- third capacitances C3- Four capacitance C4.

Second sub- working condition of the first working condition：

Referring to Figure 14, which is the second sub- working condition electric current of the first working condition that the embodiment of the present application three provides Path schematic diagram.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the second electricity When holding voltage the sum of of the sum of the voltage of C2 and the 5th capacitance C5 less than third capacitance C3 and the 4th capacitance C4, current path is： The 5th capacitance C5 of anode the-the first inductance L- first switch pipe Q1- third switching tubes Q3- of power supply.

Second of working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected.

Referring to Figure 15, which is second of working condition current path schematic diagram that the embodiment of the present application three provides.

When first switch pipe Q1 is closed, first switch pipe Q1 is equivalent to conducting wire, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit turn-on；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between the power cathode of two ends connection disconnects；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to open circuit, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnects.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is disconnected, when third switching tube Q3 is disconnected, electric current Path is：Anode the-the first inductance L- first switch pipe Q1- the second capacitance C2- the second diode D2- third capacitances C3- of power supply 4th capacitance C4；

The third working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is closed.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between the power cathode of two ends connection disconnects；When third switching tube Q3 is closed, third switching tube Q3 is equivalent to conducting wire, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit turn-on.

Three level Boost circuits under the working condition, according to the 5th capacitance C5 and the second capacitance C2 the sum of voltage with The relative size of the sum of the voltage of third capacitance C3 and the 4th capacitance C4 further comprises two seed work states, wherein third First sub- working condition of kind working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is closed It closes, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is more than the sum of the voltage of third capacitance C3 and the 4th capacitance C4；The Second sub- working condition of three kinds of working conditions is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 It is closed, and the sum of voltage of the 5th capacitance C5 and the second capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4.

First sub- working condition of the third working condition：

Referring to Figure 16, which is the first sub- working condition electric current of the third working condition that the embodiment of the present application three provides Path schematic diagram.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the second electricity When holding voltage the sum of of the sum of the voltage of C2 and the 5th capacitance C5 more than third capacitance C3 and the 4th capacitance C4, corresponding two electricity Flow path is：The 4th capacitances of anode the-the first inductance L- the first diode D1- the second diode D2- third capacitances C3- of power supply C4；The 4th capacitance C4 of 5th capacitance C5- third switching tube Q3- the second capacitance C2- the second diode D2- third capacitances C3-.

Second sub- working condition of the third working condition：

Referring to Figure 17, which is the second sub- working condition electric current of the third working condition that the embodiment of the present application three provides Path schematic diagram.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, and third switching tube Q3 is closed, the second electricity When holding voltage the sum of of the sum of the voltage of C2 and the 5th capacitance C5 less than third capacitance C3 and the 4th capacitance C4, current path is： The 5th capacitance C5 of anode the-the first inductance L- the first diode D1- the second capacitance C2- third switching tubes Q3- of power supply.

4th kind of working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected and third switching tube Q3 is disconnected.

Referring to Figure 18, which is the 4th kind of working condition current path schematic diagram that the embodiment of the present application three provides.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is disconnected When, second switch pipe Q2 is equivalent to open circuit, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit between the power cathode of two ends connection disconnects；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to open circuit, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnects.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is disconnected, when third switching tube Q3 is disconnected, electric current Path is：The 4th capacitance C4 of anode the-the first inductance L- the first diode D1- the second diode D2- third capacitances C3- of power supply.

5th kind of working condition is that first switch pipe Q1 is disconnected, second switch pipe Q2 is closed and third switching tube Q3 is disconnected.

Referring to Figure 19, which is the 5th kind of working condition current path schematic diagram that the embodiment of the present application three provides.

When first switch pipe Q1 is disconnected, first switch pipe Q1 is equivalent to open circuit, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit disconnect；When second switch pipe Q2 is closed When, second switch pipe Q2 is equivalent to conducting wire, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit turn-on between the power cathode of two ends connection；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to open circuit, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnects.

Thus, when the first switch pipe Q1 is disconnected, second switch pipe Q2 is closed, when third switching tube Q3 is disconnected, electric current Path is：Anode the-the first inductance L- the first diode D1- the second capacitance C2- second switch pipes Q2 of power supply.

6th kind of working condition is that first switch pipe Q1 is closed, second switch pipe Q2 is closed and third switching tube Q3 is disconnected.

Referring to Figure 20, which is the 6th kind of working condition current path schematic diagram that the embodiment of the present application three provides.

When first switch pipe Q1 is closed, first switch pipe Q1 is equivalent to conducting wire, then first switch pipe Q1 first ends connect The first inductance L and first switch pipe Q1 second ends connection first node between circuit turn-on；When second switch pipe Q2 is closed When, second switch pipe Q2 is equivalent to conducting wire, then the first node and second switch pipe Q2 the of second switch pipe Q2 first ends connection Circuit turn-on between the power cathode of two ends connection；When third switching tube Q3 is disconnected, third switching tube Q3 is equivalent to open circuit, Then between the first node of third switching tube Q3 first ends connection and the 5th capacitance C5 of third switching tube Q3 second ends connection Circuit disconnects.

Thus, when the first switch pipe Q1 is closed, second switch pipe Q2 is closed, when third switching tube Q3 is disconnected, electric current Path is：The cathode of anode the-the first inductance L- first switch pipe Q1- second switch pipe Q2- power supplys of power supply.

According to the analysis of the working condition of the above three level Boosts circuit：When three level Boost circuits work, Electric current flows through the first inductance L, then carries out different operations according to the size of the induced electromotive force on the first inductance L, can discharge, Induced electromotive force can also be accumulated, it can be with attonity.In addition, working as, three level Boost circuits work and third switching tube Q3 is closed When conjunction, if the sum of voltage of the 5th capacitance C5 and the second capacitance C2 more than third capacitance C3 and the 4th capacitance C4 voltage it With then the 5th capacitance C5 and the second capacitance C2 is to third capacitance C3 and the 4th capacitance C4 electric discharges；If the 5th capacitance C5 and second The sum of voltage of capacitance C2 is less than the sum of the voltage of third capacitance C3 and the 4th capacitance C4, then power supply is the 5th capacitance C5 and second Capacitance C2 chargings.However, the voltage of the second capacitance C2 is then the closure by first switch pipe Q1 or disconnects and second switch pipe The closure of Q2 disconnects control, due to the second capacitance C2 and the 5th capacitance C5 and power sources in parallel, thus, when the second capacitance C2's When voltage is controllable, the voltage of the 5th capacitance C5 is also controllable.

Three level Boosts circuit provided by the embodiments of the present application includes first switch pipe Q1, second switch pipe Q2, the first electricity Feel L, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the first diode D1, the second diode D2 and the Three switching tube Q3, and the capacitance of the second capacitance C2 and the capacitance of the 5th capacitance C5 are equal.The circuit by first switch pipe Q1 and The input voltage of the circuit is boosted in the on or off realization of second switch pipe Q2, moreover, the circuit is also big by capacitance Small comparable second capacitance C2 and the 5th capacitance C5 series connection so that the second capacitance C2 and the 5th capacitance C5 realizations are pressed, due to the One switching tube Q1 and the second capacitance C2 are in parallel, and second switch pipe Q2 is in parallel with the 5th capacitance C5, to make first switch pipe Q1 It is pressed with the Q2 realizations of second switch pipe.

Based on embodiment three provide three level Boost circuits, the circuit be also applied for Boost circuit to input voltage into The application scenarios of row low-loss transmission, following example provide a kind of three level Boost circuits, which can be to input voltage Carry out low-loss transmission.

Example IV：

Referring to Figure 21, which is the three level Boost electrical block diagrams that the embodiment of the present application four provides.

Knot of the three level Boosts circuit provided by the present application in addition to the three level Boost circuits provided including embodiment three Outside structure, further include：4th diode D4；

The anode of the 4th diode D4 connects the anode of the power supply, and the cathode of the 4th diode D4 connects institute State the output cathode of Boost circuit.

The working condition of three level Boosts circuit provided by the embodiments of the present application, the six kinds of works provided in addition to embodiment three Make outside state, further includes the 7th kind of working condition.

The electric circuit characteristic of 7th kind of working condition is：First switch pipe Q1, second switch pipe Q2 and third switching tube Q3 are equal It disconnects, and the current path of the circuit is：The 4th capacitance C4 of the four diode D4- third capacitances C3- of positive pole-the.

Based on the three level Boost circuit of one kind that above example provides, the embodiment of the present application also provides a kind of contravariant system System, is described in detail below in conjunction with the accompanying drawings.

Embodiment five：

Referring to Figure 22, which is inversion system structural schematic diagram provided by the embodiments of the present application.

Inversion system provided by the embodiments of the present application includes the three level Boost circuit of one kind that above-described embodiment provides 2201, further include：Photovoltaic array 2202 and inverter 2203；

The photovoltaic array 2202 is used as power supply, the output end of the photovoltaic array 2202 to connect three level Boost The input terminal of circuit 2201；

The output end of the three level Boosts circuit 2201 connects the input terminal of the inverter 2203；

The three level Boosts circuit 2201, the voltage for exporting the photovoltaic array 2202 boosts；

The inverter 2203, the DC inverter for exporting the three level Boosts circuit 2201 are alternating current It is supplied to power grid or load 2204.

It should be noted that 2202 exportable direct current of photovoltaic array, and the voltage of the direct current is relatively low；Inverter 2203 Input voltage it is higher.

Inversion system provided by the embodiments of the present application includes：Photovoltaic array 2202, three level Boost circuits 2201 and inversion Device 2203.Photovoltaic array 2202 is used as power supply, first converts solar energy to direct current energy, is then input to three level Boosts In circuit 2201, the voltage that three level Boost circuits 2201 are inputted the direct current of end input boosts, then will boosting DC supply input afterwards is to inverter 2203, and the direct current that inverter 2203 then exports the three level Boosts circuit 2201 Electric inversion is that alternating current is supplied to power grid or load 2204.

Inversion system provided by the embodiments of the present application includes photovoltaic array 2202, three level Boost circuits 2201 and inversion Device 2203.The photovoltaic array 2202 is used as power supply, the output end of the photovoltaic array 2202 to connect the three level Boosts electricity The input terminal on road 2201；The output end of the three level Boosts circuit 2201 connects the input terminal of the inverter 2203；It is described Three level Boost circuits 2201, the voltage for exporting the photovoltaic array 2202 boost；The inverter 2203, DC inverter for exporting the three level Boosts circuit 2201 is that alternating current is supplied to power grid or load 2204.It should The three level Boost circuits 2201 that inversion system uses can boost low-voltage DC so that high efficiency is low-loss, improve The working range and MPPT of 2203 input voltage of inverter, improves the generated energy of inverter 2203.

It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two More than a."and/or", the incidence relation for describing affiliated partner indicate may exist three kinds of relationships, for example, " A and/or B " It can indicate：A is only existed, B is only existed and exists simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word It is a kind of relationship of "or" that symbol "/", which typicallys represent forward-backward correlation object,.At least one of " following (a) " or its similar expression refers to Arbitrary combination in these, including individual event (a) or the arbitrary combination of complex item (a).At least one of for example, in a, b or c (a) can indicate：A, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", wherein a, b, c can be single, also may be used To be multiple.

The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention Technical solution makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent Variation and modification, still fall within technical solution of the present invention protection in the range of.

Claims

1. a kind of three level Boost circuits, which is characterized in that including：First switch pipe, second switch pipe, the first inductance, second Capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the first diode, the second diode and third switching tube；Second electricity The capacitance of appearance and the capacitance of the 5th capacitance are equal；

The first end of the first switch pipe connects the anode of the power supply, and the second end of the first switch pipe connects first segment Point；The first end of the second switch pipe connects the first node, and the second end of the second switch pipe passes through described first The cathode of power supply described in inductance connection；

The first end of the third capacitance connects the anode of the power supply, and the second end of the third capacitance connects second node； The first end of 4th capacitance connects the second node, and the second end of the 4th capacitance connects the defeated of the Boost circuit Go out cathode；

The first end of second capacitance connects the first node, and the second end of second capacitance connects third node；

The anode of first diode connects the third node, and the cathode of first diode connects the second switch The second end of pipe；The anode of second diode connects the output negative pole of the Boost circuit, and second diode is born Pole connects the third node；

The first end of the third switching tube connects the anode of the power supply, and the second end of the third switching tube passes through described First node described in five capacitance connections；The third switching tube includes anti-paralleled diode；

When the Boost circuit work, the third switching tube is complementary with the first switch tubulose state；The Boost circuit When not working, the third switching tube is closed.

2. three level Boosts circuit according to claim 1, which is characterized in that the third switching tube is controllable switch Pipe, the controlled tr tube anti-paralleled diode, the controlled tr tube are：IGBT, MOSFET, JFET or relay.

3. three level Boosts circuit according to claim 1 or 2, which is characterized in that when the first switch pipe be closed, Second switch pipe disconnects, and when third switching tube disconnects, current path is：The anode of power supply-the-the second capacitance-the of first switch pipe One the-the first inductance of diode；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the electricity of the 5th capacitance and the second capacitance When the sum of pressure is more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are respectively：The anode-of power supply Third capacitance the-the four capacitance the-the second diode the-the first inductance of the-the first diode；Second the-the five capacitances of capacitance-third switch Pipe-third capacitance the-the second diode of the-the four capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the electricity of the 5th capacitance and the second capacitance When the sum of pressure is less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The anode of power supply-third switching tube-the Five capacitance the-the second capacitance the-the first inductance of the-the first diode；

When the first switch pipe disconnects, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply is just Pole-third capacitance the-the four capacitance the-the second diode the-the first inductance of the-the first diode；

When the first switch pipe disconnects, second switch pipe is closed, and third switching tube is closed, the electricity of the 5th capacitance and the second capacitance When the sum of pressure is more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are respectively：The anode-of power supply The-the second capacitance of third capacitance the-the second diode of the-the four capacitance-the-the first inductance of second switch pipe；Second the-the five capacitance of capacitance- Third switching tube-third capacitance the-the second diode of the-the four capacitance；

When the first switch pipe disconnects, second switch pipe is closed, and third switching tube is closed, the electricity of the 5th capacitance and the second capacitance When the sum of pressure is less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The anode of power supply-third switching tube-the Five capacitances-second switch the-the first inductance of pipe；

When the first switch pipe disconnects, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply is just The-the second capacitance of pole-third capacitance the-the second diode of the-the four capacitance-the-the first inductance of second switch pipe；

When the first switch pipe is closed, second switch pipe is closed, and third switching tube disconnects, and current path is：The anode-of power supply First switch pipe-the-the first inductance of second switch pipe.

4. three level Boosts circuit according to claim 1 or 2, which is characterized in that further include：4th diode；

The anode of 4th diode connects the output negative pole of the Boost circuit, the cathode connection of the 4th diode The cathode of the power supply.

5. a kind of three level Boost circuits, which is characterized in that including：First switch pipe, second switch pipe, the first inductance, second Capacitance, third capacitance, the 4th capacitance, the 5th capacitance, the first diode, the second diode and third switching tube；Second electricity The capacitance of appearance and the capacitance of the 5th capacitance are equal；

The first end of the first switch pipe by the anode of power supply described in first inductance connection, the first switch pipe Second end connects first node；The first end of the second switch pipe connects the first node, and the of the second switch pipe Two ends connect the cathode of the power supply；

The first end of the third capacitance connects the output cathode of the Boost circuit, the second end connection of the third capacitance the Two nodes；The first end of 4th capacitance connects the second node, and the second end of the 4th capacitance connects Boost electricity The output negative pole on road；

The anode of first diode connects the first end of the first switch pipe, and the cathode of first diode connects institute State fourth node；The anode of second diode connects the fourth node, and the cathode connection of second diode should The output cathode of Boost circuit；

The first end of the third switching tube connects the first node, and the second end of the third switching tube passes through the described 5th The cathode of power supply described in capacitance connection；The third switching tube includes anti-paralleled diode；

6. three level Boosts circuit according to claim 5, which is characterized in that it is characterized in that, the third switching tube For controlled tr tube, the controlled tr tube anti-paralleled diode, the controlled tr tube is：IGBT, MOSFET, JFET or after Electric appliance.

7. three level Boosts circuit according to claim 5 or 6, which is characterized in that when the first switch pipe be closed, Second switch pipe disconnects, and third switching tube is closed, and the sum of voltage of the second capacitance and the 5th capacitance is more than third capacitance and the 4th When the sum of voltage of capacitance, corresponding two current paths are respectively：The-the first inductance of anode of power supply-first switch pipe-the second The-the four capacitance of the-the second diode of capacitance-third capacitance；Five capacitances-third switching tube the-the second diode-the of the-the second capacitance Three the-the four capacitances of capacitance；

When the first switch pipe is closed, second switch pipe disconnects, and third switching tube is closed, the electricity of the second capacitance and the 5th capacitance When the sum of pressure is less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The-the first inductance-the first of anode of power supply The-the five capacitance of switching tube-third switching tube；

When the first switch pipe is closed, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply is just The-the first inductance of pole-the-the second diode of the-the second capacitance of first switch pipe-the-the four capacitance of third capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the electricity of the second capacitance and the 5th capacitance When the sum of pressure is more than the sum of the voltage of third capacitance and the 4th capacitance, corresponding two current paths are：The anode-the first of power supply The-the second diode of the-the first diode of inductance-the-the four capacitance of third capacitance；Five capacitances-third the-the second capacitance-the of switching tube The-the four capacitance of two diodes-third capacitance；

When the first switch pipe disconnects, second switch pipe disconnects, and third switching tube is closed, the electricity of the second capacitance and the 5th capacitance When the sum of pressure is less than the sum of the voltage of third capacitance and the 4th capacitance, current path is：The-the first inductance-the first of anode of power supply The-the five capacitance of the-the second capacitance of diode-third switching tube；

When the first switch pipe disconnects, second switch pipe disconnects, and when third switching tube disconnects, current path is：Power supply is just Pole the-the second diode of the-the first diode of the-the first inductance-the-the four capacitance of third capacitance；

When the first switch pipe disconnects, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply is just Pole the-the second capacitance of the-the first diode of the-the first inductance-second switch pipe；

When the first switch pipe is closed, second switch pipe is closed, and when third switching tube disconnects, current path is：Power supply is just The cathode of the-the first inductance of pole-first switch pipe-second switch pipe-power supply.

8. three level Boosts circuit according to claim 5 or 6, which is characterized in that further include：4th diode；

The anode of 4th diode connects the anode of the power supply, and the cathode of the 4th diode connects the Boost The output cathode of circuit.

9. a kind of inversion system, which is characterized in that including three level Boost circuit of claim 1-8 any one of them, also wrap It includes：Photovoltaic array and inverter；

For the photovoltaic array as power supply, the output end of the photovoltaic array connects the input terminal of the three level Boosts circuit；

The inverter, for by the DC inverter of the three level Boosts circuit output be alternating current be supplied to power grid or Load.