CN107846140B - Power supply circuit of auxiliary power supply - Google Patents
Power supply circuit of auxiliary power supply Download PDFInfo
- Publication number
- CN107846140B CN107846140B CN201610836158.1A CN201610836158A CN107846140B CN 107846140 B CN107846140 B CN 107846140B CN 201610836158 A CN201610836158 A CN 201610836158A CN 107846140 B CN107846140 B CN 107846140B
- Authority
- CN
- China
- Prior art keywords
- unit
- power supply
- signal
- circuit
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
A power supply circuit of an auxiliary power supply can determine the working state of a supplied unit by a control unit, and inputs a conducting signal to a switch unit in the starting stage of the supplied unit, so that the switch unit is conducted, and a first power supply current charges a boosting unit through a current limiting unit to drive the supplied unit; after the power supply unit works normally, a cut-off signal is input to the switch unit, so that the switch unit is switched off, the loss of a soft start circuit of the auxiliary power supply, especially the loss of a current limiting unit in the soft start circuit, can be reduced on the basis of not influencing the normal start of the switch power supply, and the power density and the conversion efficiency of the switch power supply are further improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a power supply circuit of an auxiliary power supply.
Background
Generally, a switching power supply has an auxiliary power supply for providing functions such as control, protection, and driving. The starting of the switch power supply needs to start the auxiliary power supply firstly, and the output power of the auxiliary power supply is consumed and cannot participate in energy transmission, so that the auxiliary power supply directly influences the conversion efficiency of the switch power supply.
As shown in fig. 1, which is a structural diagram of a power supply circuit of an auxiliary power supply, the auxiliary power supply is connected to a main circuit bus of a switching power supply through a soft start circuit, and is connected to a main circuit output through a bootstrap power supply circuit. When the machine is started, the main circuit bus voltage charges a capacitor C through a starting resistor R, and when the capacitor C is charged to the rated starting voltage of the control chip, the control chip is started; after the control chip works, an output pin of the control chip starts to output a pulse-driven power Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), the main circuit of the switching power supply starts to output and feed back voltage, and the control chip starts to be powered by the voltage output by the main circuit. That is to say, after the switching power supply normally works, the control chip of the auxiliary power supply does not need the soft start circuit to supply power to the switching power supply, and at this time, the power consumption of the soft start circuit causes the waste of power, thereby reducing the power density and the conversion efficiency of the switching power supply.
Disclosure of Invention
The embodiment of the invention provides a power supply circuit of an auxiliary power supply, which is used for solving the problem that the power density and the conversion rate of a switching power supply are lower due to higher power consumption of the power supply circuit of the conventional auxiliary power supply.
The embodiment of the invention provides a power supply circuit of an auxiliary power supply, which comprises a bootstrap power supply circuit and a soft start circuit, wherein in the normal working stage of a powered unit, the output voltage of a main circuit supplies power to the powered unit through the bootstrap power supply circuit; in a starting phase of the powered unit, a first power supply current drives the powered unit through the soft start circuit, the soft start circuit comprises a control unit, a switch unit, a current limiting unit and a boosting unit, wherein:
the control unit is used for determining the working state of the power supply unit and outputting a control signal to the switch unit according to the determined working state of the power supply unit; the power supply system comprises a power supply unit, a switching unit and a power supply unit, wherein the power supply unit outputs a conducting signal to the switching unit in a starting stage and outputs a stopping signal to the switching unit in a normal working stage;
the switch unit is used for being switched on when receiving the switching-on signal and being switched off when receiving the switching-off signal;
the current limiting unit is used for limiting the current flowing through the current limiting unit when the switch unit is conducted;
and the boosting unit is used for charging to the rated driving voltage of the power supply unit when the switching unit is conducted, and driving the power supply unit.
The invention has the following beneficial effects:
according to the power supply circuit of the auxiliary power supply, the control unit can determine the working state of the power supply unit, and in the starting stage of the power supply unit, a conducting signal is input to the switch unit, so that the switch unit is conducted, and the first power supply current charges the boosting unit through the current limiting unit to drive the power supply unit; after the power supply unit works normally, a cut-off signal is input to the switch unit, so that the switch unit is switched off, the loss of a soft start circuit of the auxiliary power supply, especially the loss of a current limiting unit in the soft start circuit, can be reduced on the basis of not influencing the normal start of the switch power supply, and the power density and the conversion efficiency of the switch power supply are further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
FIG. 1 is a block diagram of a prior art power supply circuit for an auxiliary power supply;
fig. 2 is a structural diagram of a power supply circuit of an auxiliary power supply according to an embodiment of the present invention;
fig. 3 is a detailed structural diagram of a power supply circuit of an auxiliary power supply according to an embodiment of the present invention;
fig. 4 is a detailed structural diagram of a power supply circuit of an auxiliary power supply according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a power supply circuit of an auxiliary power supply, and specifically, as shown in fig. 2, the power supply circuit of the auxiliary power supply in the embodiment of the present invention is a structural diagram, and includes a bootstrap power supply circuit and a soft start circuit, wherein, in a normal working stage of a unit to be powered, an output voltage of a main circuit supplies power to the unit to be powered through the bootstrap power supply circuit; in a start-up phase of the powered unit, a first power current drives the powered unit through the soft start circuit, which may include a control unit 21, a switching unit 22, a current limiting unit 23, and a voltage boosting unit 24, wherein:
the control unit 21 is configured to determine an operating state of the power-supplied unit 25, and output a control signal to the switch unit 22 according to the determined operating state of the power-supplied unit 25; wherein, an on signal is output to the switching unit 22 at a start-up stage of the supplied unit 25, and an off signal is output to the switching unit 22 at a normal operation stage of the supplied unit 25;
the switching unit 22 is configured to be turned on when receiving the on signal and turned off when receiving the off signal;
the current limiting unit 23 is configured to limit a current flowing through the current limiting unit 23 when the switch unit 22 is turned on;
the boosting unit 24 is charged to a rated driving voltage of the power-supplied unit 25 when the switching unit 22 is turned on, and drives the power-supplied unit 25.
That is to say, in the power supply circuit of the auxiliary power supply provided in the embodiment of the present invention, the control unit may determine the operating state of the powered unit, and, in the starting stage of the powered unit, input the conducting signal to the switching unit, so that the switching unit is conducting, and the first power supply current charges the voltage boosting unit through the current limiting unit to drive the powered unit; after the power supply unit works normally, a cut-off signal is input to the switch unit, so that the switch unit is switched off, the loss of a soft start circuit of the auxiliary power supply, especially the loss of a current limiting unit in the soft start circuit, can be reduced on the basis of not influencing the normal start of the switch power supply, and the power density and the conversion efficiency of the switch power supply are further improved.
Optionally, the first power supply may be an independent power supply or another power output port of the switching power supply where the auxiliary power supply is located, so as to achieve more flexible power supply mode; preferably, the first power source may be a main circuit bus, that is, in a starting stage of the powered unit 25, the powered unit 25 may be driven by the soft start circuit through a main circuit bus current, which is not described herein again.
The control unit 21 may specifically include a sampling unit 211 and an execution unit 212, where:
the sampling unit 211 is configured to determine an operating state of the powered unit 25; when the powered unit 25 is determined to be in the starting stage, outputting a first signal to the execution unit 212, and when the powered unit 25 is determined to be in the normal working stage, outputting a second signal to the execution unit 212;
the execution unit 212 is configured to output an on signal to the switch unit 22 when receiving the first signal, and output an off signal to the switch unit 22 when receiving the second signal.
Optionally, the sampling unit 211 may be specifically configured to sample the main circuit output voltage; and when the main circuit output voltage is lower than a set voltage value (which can be flexibly set according to actual conditions), determining that the powered unit 25 is in a starting stage, and when the main circuit output voltage is not lower than the set voltage value, determining that the powered unit 25 is in a normal working stage.
Further alternatively, the sampling unit 211 may be implemented by a DSP (Digital Signal Processor) module, and may also be implemented by a sampling circuit. When the voltage output by the main circuit of the switching power supply is lower than the set voltage value, it indicates that the switching power supply does not work normally, and the control signal output by the sampling unit 211 is a first signal; when the voltage output by the main circuit of the switching power supply is not lower than the set voltage value, it indicates that the switching power supply has normally operated, and the control signal output by the sampling unit 211 is the second signal, which is not described herein again.
Optionally, the first signal is a low level signal, and the second signal is a high level signal; the on signal is a high level signal and the off signal is a low level signal. Of course, according to different specific implementations of the circuit, the first signal may be a high level signal, and the second signal may be a low level signal, or the on signal may be a low level signal, and the off signal may be a high level signal, which is not limited herein.
Specifically, in the power supply circuit of the auxiliary power supply provided in the embodiment of the present invention shown in fig. 2, one end 2301 of the current limiting unit 23 is a first power supply terminal, the other end 2302 is connected to the first end 2201 of the switching unit 22, the second end 2202 of the switching unit 22 is connected to the first end 2401 of the voltage boosting unit 24, the second end 2402 of the voltage boosting unit 24 is connected to the first end 2501 of the powered unit 25, and the third end 2403 of the voltage boosting unit 24 and the second end 2502 of the powered unit 25 are common ground terminals;
the first terminal 2101 of the control unit 21 is a main circuit output terminal, the second terminal 2102 is a second power supply terminal, the third terminal 2103 is connected with the third terminal 2203 of the switching unit 22, and the fourth terminal 2104 is a common ground terminal.
It should be noted that the second power supply is configured to provide a pull-up voltage for the control unit 21, and optionally, the second power supply may be an independent power supply or another power output port of the switching power supply where the auxiliary power supply is located, so as to achieve a more flexible power supply manner; preferably, to simplify the circuit structure, the second power source may be a main circuit bus, which is not described herein again.
Optionally, the control unit 21 may include a sampling unit 211 and an execution unit 212, wherein a first end 2111 of the sampling unit 211 serves as a first end 2101 of the control unit 21, and a second end 2112 is connected to a first end 2121 of the execution unit 212; the second end 2122 of the execution unit 212 serves as the second end 2102 of the control unit 21, the third end 2123 serves as the third end 2103 of the control unit 21, and the fourth end 2124 serves as the fourth end 2104 of the control unit 21.
Further optionally, the execution unit 212 may include a first resistor, a second resistor, a third resistor, a first capacitor, a first NPN transistor, and a zener diode, wherein:
one end of the first resistor serves as a first end 2121 of the execution unit 212;
the other end of the first resistor is connected with one end of the second resistor, one end of the first capacitor and the first end of the first NPN type triode;
one end of the third resistor is used as the second end 2122 of the execution unit 212, and the other end of the third resistor is connected to the second end of the first NPN transistor and the negative electrode of the zener diode, and is used as the third end 2123 of the execution unit 212;
the other end of the second resistor is connected to the other end of the first capacitor, the third end of the first NPN transistor, and the anode of the zener diode, and serves as the fourth end 2124 of the execution unit 212;
the base electrode of the first NPN type triode is the first end of the first NPN type triode, the collector electrode of the first NPN type triode is the second end of the first NPN type triode, and the emitter electrode of the first NPN type triode is the third end of the first NPN type triode.
Wherein the boosting unit 24 may include a diode and a second capacitor, wherein:
the anode of the diode is used as the first end 2401 of the boosting unit 24, and the cathode of the diode is connected with one end of the second capacitor and is used as the second end 2402 of the boosting unit 24;
the other end of the second capacitor is used as a third terminal 2403 of the boosting unit 24.
Alternatively, the switch unit 22 may be specifically a transistor, a first terminal of the transistor is used as the first terminal 2201 of the switch unit 22, a second terminal of the transistor is used as the second terminal 2202 of the switch unit 22, and a third terminal of the transistor is used as the third terminal 2203 of the switch unit 22.
Further alternatively, the transistor may be specifically a power field effect transistor, a drain of the power field effect transistor is used as the first terminal of the transistor, a source of the power field effect transistor is used as the second terminal of the transistor, and a gate of the power field effect transistor is used as the third terminal of the transistor.
Further optionally, the transistor may specifically be a second NPN type triode, a collector of the second NPN type triode is used as the first end of the transistor, an emitter of the second NPN type triode is used as the second end of the transistor, and a base of the second NPN type triode is used as the third end of the transistor.
That is to say, each functional unit in the power supply circuit of the auxiliary power supply can adopt a discrete component, so that the power supply circuit also has the advantages of high compatibility and low cost.
The following describes the power supply circuit in detail with specific embodiments, taking the power-supplied unit as a control chip as an example, for different implementations of the switching unit and the sampling unit.
The first embodiment is as follows:
the first embodiment of the invention provides a power supply circuit of an auxiliary power supply, which comprises a bootstrap power supply circuit and a soft start circuit, wherein in the normal working stage of a powered unit, the output voltage of a main circuit supplies power to the powered unit through the bootstrap power supply circuit; in a starting phase of the powered unit, a first power current drives the powered unit through the soft start circuit, which includes a control unit 21, a switch unit 22, a current limiting unit 23 and a voltage boosting unit 24, wherein:
the control unit 21 is configured to determine an operating state of the power-supplied unit 25, and output a control signal to the switch unit 22 according to the determined operating state of the power-supplied unit 25; wherein, an on signal is output to the switching unit 22 at a start-up stage of the supplied unit 25, and an off signal is output to the switching unit 22 at a normal operation stage of the supplied unit 25;
the switching unit 22 is configured to be turned on when receiving the on signal and turned off when receiving the off signal;
the current limiting unit 23 is configured to limit a current flowing through the current limiting unit 23 when the switch unit 22 is turned on;
the boosting unit 24 is charged to a rated driving voltage of the power-supplied unit 25 when the switching unit 22 is turned on, and drives the power-supplied unit 25.
A detailed structure of the power supply circuit of the auxiliary power supply according to the first embodiment of the present invention is shown in fig. 3.
The powered unit is a control chip.
One end 2301 of the current limiting unit 23 is a first power supply terminal, the other end 2302 is connected with the first end 2201 of the switching unit 22, the second end 2202 of the switching unit 22 is connected with the first end 2401 of the boosting unit 24, the second end 2402 of the boosting unit 24 is connected with the first end 2501 of the control chip, and the third end 2403 of the boosting unit 24 and the second end 2502 of the control chip are common ground terminals;
the first terminal of the control unit 21 is a main circuit output terminal, the second terminal is a second power supply terminal, the third terminal is connected to the third terminal 2203 of the switch unit 22, and the fourth terminal is a common ground terminal.
Further alternatively, the control unit 21 may comprise a sampling unit and an execution unit 212, wherein a first end 2111 of the sampling unit is used as a first end of the control unit 21, and a second end 2112 is connected to a first end 2121 of the execution unit 212; a second end 2122 of the execution unit 212 serves as a second end of the control unit 21, a third end 2123 serves as a third end of the control unit 21, and a fourth end 2124 serves as a fourth end of the control unit 21. Wherein, the sampling unit can be realized by a DSP module (the DSP module and other terminals of the control chip are not shown in FIG. 3).
The execution unit 212 may include a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first NPN transistor T1, and a zener diode D1, wherein:
one end of the first resistor R1 is used as the first end 2121 of the execution unit 212;
the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the first capacitor C1 and a first end of the first NPN transistor T1;
one end of the third resistor R3 is used as the second end 2122 of the execution unit 212, and the other end is connected to the second end of the first NPN transistor T1 and the negative electrode of the zener diode D1 and is used as the third end 2123 of the execution unit 212;
the other end of the second resistor R2 is connected to the other end of the first capacitor C1, the third end of the first NPN transistor T1, and the anode of the zener diode D1, and serves as the fourth end 2124 of the execution unit 212;
a base b of the first NPN transistor T1 is a first end of the first NPN transistor T1, a collector c of the first NPN transistor T1 is a second end of the first NPN transistor T1, and an emitter e of the first NPN transistor T1 is a third end of the first NPN transistor T1.
Wherein the boosting unit 24 may include a diode D2 and a second capacitor C2, wherein:
the anode of the diode D2 is used as the first end 2401 of the voltage boost unit 24, and the cathode is connected to one end of the second capacitor C2 and is used as the second end 2402 of the voltage boost unit 24;
the other end of the second capacitor C2 is used as the third terminal 2403 of the voltage boost unit 24.
The switch unit 22 may be specifically a transistor, a first terminal of the transistor is used as the first terminal 2201 of the switch unit 22, a second terminal of the transistor is used as the second terminal 2202 of the switch unit 22, and a third terminal of the transistor is used as the third terminal 2203 of the switch unit 22.
Further alternatively, the transistor may be embodied as a power field effect transistor Q1, the drain d of the power field effect transistor Q1 being the first terminal of the transistor, the source s of the power field effect transistor Q1 being the second terminal of the transistor, and the gate g of the power field effect transistor Q1 being the third terminal of the transistor.
Optionally, the first signal is a low level signal, and the second signal is a high level signal; the on signal is a high level signal and the off signal is a low level signal.
In order to further explain the start-up circuit provided in the first embodiment of the present invention, the operation principle thereof is explained in detail below.
When the switching power supply is started, the DSP module detects that the voltage output by the main circuit is lower than a set voltage value, outputs a first signal low level signal, the first NPN type transistor T1 is turned off, the voltage between the gate and the source of the electric field effect transistor Q1 is at a high level, the electric field effect transistor Q1 is in a conducting state, and the first supply current drives the control chip after charging the second capacitor C2 to a rated starting voltage of the control chip through the current limiting unit 23 (the current limiting unit here is a resistor); when the switching power supply normally works, the DSP module detects that the voltage output by the main circuit is not lower than the set voltage value, outputs a second signal high level signal, the first NPN transistor T1 is turned on, the voltage between the gate and the source of the electric field effect transistor Q1 is at a low level, the electric field effect transistor Q1 is in a cut-off state, and the control chip is powered by the main circuit output voltage of the switching power supply through the bootstrap power supply circuit.
In summary, in the power supply circuit of the auxiliary power supply provided in the embodiment of the present invention, the control unit may determine the working state of the powered unit, and, in the starting stage of the powered unit, input the conducting signal to the switching unit, so that the switching unit is conducting, and the first power current charges the voltage boosting unit through the current limiting unit to drive the powered unit; after the power supply unit works normally, a cut-off signal is input to the switch unit, so that the switch unit is switched off, the loss of a soft start circuit of the auxiliary power supply, especially the loss of a current limiting unit in the soft start circuit, can be reduced on the basis of not influencing the normal start of the switch power supply, and the power density and the conversion efficiency of the switch power supply are further improved. In addition, each functional unit in the power supply circuit can adopt discrete elements, so that the power supply circuit has the advantages of high compatibility and low cost.
Example two:
the second embodiment of the invention provides a power supply circuit of an auxiliary power supply, which comprises a bootstrap power supply circuit and a soft start circuit, wherein in the normal working stage of a powered unit, the output voltage of a main circuit supplies power to the powered unit through the bootstrap power supply circuit; in a starting phase of the powered unit, a first power current drives the powered unit through the soft start circuit, which includes a control unit 21, a switch unit 22, a current limiting unit 23 and a voltage boosting unit 24, wherein:
the control unit 21 is configured to determine an operating state of the power-supplied unit 25, and output a control signal to the switch unit 22 according to the determined operating state of the power-supplied unit 25; wherein, an on signal is output to the switching unit 22 at a start-up stage of the supplied unit 25, and an off signal is output to the switching unit 22 at a normal operation stage of the supplied unit 25;
the switching unit 22 is configured to be turned on when receiving the on signal and turned off when receiving the off signal;
the current limiting unit 23 is configured to limit a current flowing through the current limiting unit 23 when the switch unit 22 is turned on;
the boosting unit 24 is charged to a rated driving voltage of the power-supplied unit 25 when the switching unit 22 is turned on, and drives the power-supplied unit 25.
A detailed structure of the power supply circuit of the auxiliary power supply according to the second embodiment of the present invention is shown in fig. 4.
The powered unit is a control chip.
One end 2301 of the current limiting unit 23 is a first power supply terminal, the other end 2302 is connected with the first end 2201 of the switching unit 22, the second end 2202 of the switching unit 22 is connected with the first end 2401 of the boosting unit 24, the second end 2402 of the boosting unit 24 is connected with the first end 2501 of the control chip, and the third end 2403 of the boosting unit 24 and the second end 2502 of the control chip are common ground terminals;
the first terminal of the control unit 21 is a main circuit output terminal, the second terminal is a second power supply terminal, the third terminal is connected to the third terminal 2203 of the switch unit 22, and the fourth terminal is a common ground terminal.
Further alternatively, the control unit 21 may comprise a sampling unit and an execution unit 212, wherein a first end 2111 of the sampling unit is used as a first end of the control unit 21, and a second end 2112 is connected to a first end 2121 of the execution unit 212; a second end 2122 of the execution unit 212 serves as a second end of the control unit 21, a third end 2123 serves as a third end of the control unit 21, and a fourth end 2124 serves as a fourth end of the control unit 21. Wherein, the sampling unit can be realized by a sampling circuit (the specific circuit structure of the sampling circuit and other terminals of the control chip are not shown in fig. 4).
The execution unit 212 may include a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a first NPN transistor T1, and a zener diode D1, wherein:
one end of the first resistor R1 is used as the first end 2121 of the execution unit 212;
the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the first capacitor C1 and a first end of the first NPN transistor T1;
one end of the third resistor R3 is used as the second end 2122 of the execution unit 212, and the other end is connected to the second end of the first NPN transistor T1 and the negative electrode of the zener diode D1 and is used as the third end 2123 of the execution unit 212;
the other end of the second resistor R2 is connected to the other end of the first capacitor C1, the third end of the first NPN transistor T1, and the anode of the zener diode D1, and serves as the fourth end 2124 of the execution unit 212;
a base b of the first NPN transistor T1 is a first end of the first NPN transistor T1, a collector c of the first NPN transistor T1 is a second end of the first NPN transistor T1, and an emitter e of the first NPN transistor T1 is a third end of the first NPN transistor T1.
Wherein the boosting unit 24 may include a diode D2 and a second capacitor C2, wherein:
the anode of the diode D2 is used as the first end 2401 of the voltage boost unit 24, and the cathode is connected to one end of the second capacitor C2 and is used as the second end 2402 of the voltage boost unit 24;
the other end of the second capacitor C2 is used as the third terminal 2403 of the voltage boost unit 24.
The switch unit 22 may be specifically a transistor, a first terminal of the transistor is used as the first terminal 2201 of the switch unit 22, a second terminal of the transistor is used as the second terminal 2202 of the switch unit 22, and a third terminal of the transistor is used as the third terminal 2203 of the switch unit 22.
The transistor may be specifically a second NPN transistor T2, a collector c of the second NPN transistor T2 serves as a first terminal of the transistor, an emitter e of the second NPN transistor T2 serves as a second terminal of the transistor, and a base b of the second NPN transistor T2 serves as a third terminal of the transistor.
Optionally, the first signal is a low level signal, and the second signal is a high level signal; the on signal is a high level signal and the off signal is a low level signal.
The working principle of the start-up circuit provided by the second embodiment of the present invention is similar to that of the above-mentioned embodiments, and is not described herein again.
In summary, in the power supply circuit of the auxiliary power supply provided in the embodiment of the present invention, the control unit may determine the working state of the powered unit, and, in the starting stage of the powered unit, input the conducting signal to the switching unit, so that the switching unit is conducting, and the first power current charges the voltage boosting unit through the current limiting unit to drive the powered unit; after the power supply unit works normally, a cut-off signal is input to the switch unit, so that the switch unit is switched off, the loss of a soft start circuit of the auxiliary power supply, especially the loss of a current limiting unit in the soft start circuit, can be reduced on the basis of not influencing the normal start of the switch power supply, and the power density and the conversion efficiency of the switch power supply are further improved. In addition, each functional unit in the power supply circuit can adopt discrete elements, so that the power supply circuit has the advantages of high compatibility and low cost.
It should be noted that, without being limited to the solutions provided in the first and second embodiments, the switching unit of the power supply circuit of the auxiliary power supply may also adopt other switching devices, and the present embodiment is not limited in any way herein.
Furthermore, any number of elements in the drawings and description are to be regarded as illustrative in nature and not as restrictive, and any naming is intended to be distinguishing rather than limiting.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A power supply circuit of an auxiliary power supply comprises a bootstrap power supply circuit and a soft start circuit, wherein in the normal working stage of a power supply unit, the output voltage of a main circuit supplies power to the power supply unit through the bootstrap power supply circuit; in a starting phase of the powered unit, a first power current drives the powered unit through the soft start circuit, wherein the soft start circuit includes a control unit, a switch unit, a current limiting unit and a voltage boosting unit, wherein:
the control unit is used for determining the working state of the power supply unit and outputting a control signal to the switch unit according to the determined working state of the power supply unit; the power supply system comprises a power supply unit, a switching unit and a power supply unit, wherein the power supply unit outputs a conducting signal to the switching unit in a starting stage and outputs a stopping signal to the switching unit in a normal working stage;
the switch unit is used for being switched on when receiving the switching-on signal and being switched off when receiving the switching-off signal;
the current limiting unit is used for limiting the current flowing through the current limiting unit when the switch unit is conducted;
the boosting unit is used for charging to the rated driving voltage of the power supply unit when the switching unit is conducted, and driving the power supply unit;
the control unit specifically comprises a sampling unit and an execution unit, wherein:
the sampling unit is used for determining the working state of the power supply unit; when the powered unit is determined to be in a starting stage, outputting a first signal to the execution unit, and when the powered unit is determined to be in a normal working stage, outputting a second signal to the execution unit;
the execution unit is used for outputting a conducting signal to the switch unit when receiving the first signal, and outputting a stopping signal to the switch unit when receiving the second signal.
2. The circuit of claim 1,
one end of the current limiting unit is a first power supply terminal, the other end of the current limiting unit is connected with the first end of the switch unit, the second end of the switch unit is connected with the first end of the boosting unit, the second end of the boosting unit is connected with the first end of the powered unit, and the third end of the boosting unit and the second end of the powered unit are common-ground terminals;
the first end of the control unit is a main circuit output terminal, the second end of the control unit is a second power supply terminal, the third end of the control unit is connected with the third end of the switch unit, and the fourth end of the control unit is a common ground terminal.
3. The circuit of claim 1,
the sampling unit is specifically used for sampling the output voltage of the main circuit; and when the main circuit output voltage is lower than a set voltage value, determining that the power supply unit is in a starting stage, and when the main circuit output voltage is not lower than the set voltage value, determining that the power supply unit is in a normal working stage.
4. The circuit of claim 1,
the first signal is a low level signal, and the second signal is a high level signal;
the on signal is a high level signal and the off signal is a low level signal.
5. The circuit of claim 1,
the first end of the sampling unit is used as the first end of the control unit, and the second end of the sampling unit is connected with the first end of the execution unit;
the second end of the execution unit is used as the second end of the control unit, the third end is used as the third end of the control unit, and the fourth end is used as the fourth end of the control unit.
6. The circuit of claim 5, wherein the execution unit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a first NPN transistor, and a zener diode, wherein:
one end of the first resistor is used as a first end of the execution unit;
the other end of the first resistor is connected with one end of the second resistor, one end of the first capacitor and the first end of the first NPN type triode;
one end of the third resistor is used as a second end of the execution unit, and the other end of the third resistor is connected with the second end of the first NPN type triode and the negative electrode of the voltage stabilizing diode and is used as a third end of the execution unit;
the other end of the second resistor is connected with the other end of the first capacitor, the third end of the first NPN type triode and the anode of the voltage stabilizing diode and serves as the fourth end of the execution unit;
the base electrode of the first NPN type triode is the first end of the first NPN type triode, the collector electrode of the first NPN type triode is the second end of the first NPN type triode, and the emitter electrode of the first NPN type triode is the third end of the first NPN type triode.
7. The circuit of claim 1, wherein the boost unit comprises a diode and a second capacitor, wherein:
the anode of the diode is used as the first end of the boosting unit, and the cathode of the diode is connected with one end of the second capacitor and is used as the second end of the boosting unit;
and the other end of the second capacitor is used as a third end of the boosting unit.
8. The circuit of claim 1, wherein the switching unit is a transistor, wherein:
the first terminal of the transistor is used as the first terminal of the switch unit, the second terminal of the transistor is used as the second terminal of the switch unit, and the third terminal of the transistor is used as the third terminal of the switch unit.
9. The circuit of claim 8,
the transistor is specifically a power field effect transistor, a drain of the power field effect transistor is used as a first end of the transistor, a source of the power field effect transistor is used as a second end of the transistor, and a gate of the power field effect transistor is used as a third end of the transistor; or the like, or, alternatively,
the transistor is specifically a second NPN type triode, a collector of the second NPN type triode is used as a first end of the transistor, an emitter of the second NPN type triode is used as a second end of the transistor, and a base of the second NPN type triode is used as a third end of the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836158.1A CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836158.1A CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107846140A CN107846140A (en) | 2018-03-27 |
| CN107846140B true CN107846140B (en) | 2020-07-28 |
Family
ID=61657367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610836158.1A Active CN107846140B (en) | 2016-09-20 | 2016-09-20 | Power supply circuit of auxiliary power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107846140B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414748A (en) * | 2007-10-19 | 2009-04-22 | 深圳迈瑞生物医疗电子股份有限公司 | Method for starting control circuit and protecting power supply control chip |
| CN204442165U (en) * | 2015-03-20 | 2015-07-01 | 北京益弘泰科技发展有限责任公司 | A kind of low power consumption switch power starting circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060087302A1 (en) * | 2001-08-22 | 2006-04-27 | Anadigics, Inc. | MMIC DC-to-DC converter |
| KR100809269B1 (en) * | 2006-10-31 | 2008-03-03 | 삼성전기주식회사 | Control circuit of dc-dc convertor |
| CN103475206B (en) * | 2013-09-23 | 2016-02-17 | 深圳科士达科技股份有限公司 | A kind of start-up circuit of PWM chip of wide-voltage auxiliary power source |
| CN205142002U (en) * | 2015-09-30 | 2016-04-06 | 广州金升阳科技有限公司 | Switching power supply from supply circuit |
-
2016
- 2016-09-20 CN CN201610836158.1A patent/CN107846140B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101414748A (en) * | 2007-10-19 | 2009-04-22 | 深圳迈瑞生物医疗电子股份有限公司 | Method for starting control circuit and protecting power supply control chip |
| CN204442165U (en) * | 2015-03-20 | 2015-07-01 | 北京益弘泰科技发展有限责任公司 | A kind of low power consumption switch power starting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107846140A (en) | 2018-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2014524232A (en) | Power supply apparatus and method, and user apparatus | |
| JP2008026947A (en) | Voltage regulator | |
| CN102754336B (en) | Digital amplifier | |
| US8866339B2 (en) | Power management circuit | |
| CN111601422A (en) | Starting circuit and electronic equipment | |
| JPWO2016001976A1 (en) | Power converter | |
| CN112636732B (en) | Power-off delay protection circuit and device | |
| CN109494978B (en) | Integrated circuit of power supply switching circuit and power supply switching controller | |
| US20170093389A1 (en) | Driver circuit | |
| CN108811279B (en) | Flash lamp driving method and electronic equipment | |
| CN109901689B (en) | Hardware switch circuit | |
| CN107846140B (en) | Power supply circuit of auxiliary power supply | |
| US20240310100A1 (en) | Control Circuit Including a Controller and an Enable Module, Signal Conversion Circuit Coupled to the Controller, and Control Method | |
| US8250391B2 (en) | Method and system of improving memory power efficiency | |
| CN104038194B (en) | A kind of power switch circuit | |
| US11264864B2 (en) | Flat-motor driving method and drive circuit, and electronic device | |
| CN105072756A (en) | Light-emitting diode (LED) constant current driving circuit, driving chip and control method of driving chip | |
| CN109639116B (en) | Power device and electric appliance | |
| CN103107577B (en) | Battery management circuit and terminal | |
| CN116667713A (en) | Motor pre-driving circuit and motor control system | |
| CN213780904U (en) | Power supply switching system | |
| CN112711320A (en) | Power switching system and method, computer readable storage medium and processor | |
| JP4041763B2 (en) | Charge control device and charge control method | |
| US10305302B2 (en) | Apparatus for controlling power mode of battery pack | |
| CN114865908B (en) | I-type three-level circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |