CN105281574B - A kind of LC parallel connection two-way resonance DC/DC converter and its control method - Google Patents
A kind of LC parallel connection two-way resonance DC/DC converter and its control method Download PDFInfo
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Abstract
The present invention relates to a kind of LC parallel connection two-way resonance DC/DC converter and its control method, the converter is suitable for high-power occasion；The converter includes sequentially connected converter module 1, resonant element and converter module 2；The variator module 1 respectively includes DC power supply in parallel, filter capacitor and converter bridge arm with the converter module 2；The bridge arm includes two branches being composed in series by two switching tubes in parallel；The resonant element is separately connected between two switching tubes in each branch.The method is the buck-boost mode for cut-offfing eight stages of realization by control switch pipe.The present invention has to and fro flow of power ability, can be realized the different demands of boosting and decompression.
Description
Technical field:
The present invention relates to a kind of two-way resonance DC/DC converter and its control methods, are more particularly to a kind of suitable for height
Press powerful LC parallel connection two-way resonance DC/DC converter and its control method.
Background technique:
Sensitive load, important load with the high speed development of city size increased rapidly with information technology, in power grid
And nonlinear-load is more and more, AC distribution net will face big line loss, power supply corridor anxiety and voltage transient and fall
Fall, voltage fluctuation, mains by harmonics, three-phase imbalance phenomenon aggravation etc. a series of power quality problems, it is existing there is an urgent need to change
Distribution net work structure and with (confessions) electricity mode.
Had in terms of transmission capacity, controllability and raising based on the power distribution network of direct current more better than exchanging
Performance can effectively improve power quality, the use for reducing power electronics inverter, reduce electric energy loss and operating cost, association
The contradiction between power grid and distributed generation resource is tuned up, the value and benefit of distributed energy are given full play to.
Loss is that an important consideration factor, soft switch technique can be reduced out largely in high power transmission
The loss of device is closed, power transmission efficiency is improved, moreover it is possible to effectively prevent switching device to damage due to generating heat excessive, it is proposed that one
Kind is suitable for powerful LC parallel connection two-way resonance DC/DC converter and its control method.
Summary of the invention:
The object of the present invention is to provide a kind of LC parallel connection two-way resonance DC/DC converter and its control method, the present invention is real
The buck of high power converter in DC distribution net is showed.
To achieve the above object, the invention adopts the following technical scheme: a kind of LC parallel connection two-way resonance DC/DC converter,
The converter is suitable for high-power occasion；The converter include sequentially connected converter module 1, resonant element and
Converter module 2；The variator module 1 and the converter module 2 respectively include DC power supply in parallel, filter capacitor and
Converter bridge arm；The bridge arm includes two branches being composed in series by two switching tubes in parallel；The resonant element difference
It connects between two switching tubes in each branch.
A kind of LC parallel connection two-way resonance DC/DC converter provided by the invention, each equal reverse parallel connection of switching tube
Diode；Branch in the variator module 1 includes concatenated upper tube Q2 and down tube Q4 and concatenated upper tube Q1 and down tube
Q3；Branch in the variator module 2 includes concatenated Q6 and Q8 and concatenated Q5 and Q7.
A kind of LC parallel connection two-way resonance DC/DC converter provided by the invention, the resonant element include inductance in parallel
Lr and capacitor Cr；The first end of the resonant element is separately connected between switching tube Q1 and Q3 between switching tube Q6 and Q8；Institute
The second end for stating resonant element is separately connected between switching tube Q2 and Q4 between switching tube Q5 and Q7.
Another preferred a kind of LC parallel connection two-way resonance DC/DC converter provided by the invention, in the variator module 2
Converter bridge arm and its filter capacitor between tandem tap pipe Q9, the switching tube Q9 anti-parallel diodes D9.
The present invention provides a kind of controlling party of LC parallel connection two-way resonance DC/DC converter comprising above-mentioned technical proposal
Method, the method includes eight stages；When being depressured work in the first phase, the switching tube Q1 and switching tube Q4 conducting, institute
State the voltage V1 of the DC power supply for the converter module 1 that the voltage VCr of capacitor Cr is negative；
It is defeated that the inductance Lr electric current is linearly reduced to zero and then is reversely increased to I1 again until I1 is greater than I0 by positive I0
Enter to the process of inductance supplement energy, output electric current is provided by filter capacitor C2；
When boosting work, the switching tube Q5 and switching tube Q8 are connected, and the voltage VCr of the capacitor in the resonant element is
Voltage on the voltage V2, the inductance Lr of the DC power supply of the converter module 2 is equal to input voltage, the inductive current
It linearly increases；The stage is the process for inputing to inductance supplement energy, and inductive current increases linearly to I1 since I0, is exported
Electric current is provided by filter capacitor.
The another preferred method provided by the invention, when being depressured work in second stage, the switching tube Q1
It is simultaneously turned off with switching tube Q4, parallel resonance occurs for the inductance Lr and capacitor Cr until the switching tube Q9 is connected, the electricity
The voltage VCr for holding Cr is equal to the voltage V2；In the stage, the input terminal and output end of the converter do not have energy transmission,
Output electric current is still provided by filter capacitor C2；The energy of converter is transmitted between the inductance Lr and capacitor Cr, but
Gross energy on inductance Lr and capacitor Cr is constant；
When boosting work, the switching tube Q5 and switching tube Q8 are simultaneously turned off, and parallel connection occurs for the inductance Lr and capacitor Cr
The voltage V1 that resonance is negative until the voltage VCr；The input terminal and output end of converter described at this stage do not have
Energy transmission, output electric current are still provided by filter capacitor C1, and energy is transmitted between the inductance Lr and capacitor Cr, institute
The gross energy for stating inductance and capacitor is constant.
The another preferred method provided by the invention, when being depressured work in the phase III, the switching tube Q5
Anti- and diode D5 and switching tube Q8 anti-and diode D8 conducting, the electric current in the inductance Lr flows through the anti-of switching tube Q5
And the anti-and diode D8 of diode D5 and switching tube Q8 is filter capacitor C2 charging, and provides load current；In the stage, institute
The voltage for stating capacitor Cr remains unchanged, and the inductance Lr powers on cleanliness reduction；The energy of converter input is exactly at this stage
It is transmitted to terminating until the switching tube Q9 is turned off for load；
When boosting work, the anti-and diode D4 conducting of the anti-and diode D1 and switching tube Q4 of the switching tube Q1, institute
It states the electric current in inductance Lr and flows through anti-and diode D1, the anti-and diode D4 charges to filter capacitor C1, and provides load
Electric current, interior at this stage, the capacitor VCr is remained unchanged, and the inductance Lr powers on cleanliness reduction, the converter input
Energy is transmitted to load until the inductance Lr electric current is zero end at this stage.
The another preferred method provided by the invention, when being depressured work in fourth stage, the resonant inductance
The electric current iLr of Lr is I3, and the voltage VCr of the capacitor Cr is the output voltage V2, the anti-and diode of the switching tube Q5
The anti-and diode D8 of the D5 and switching tube Q8 is turned off, and parallel resonance occurs for the inductance Lr and capacitor Cr until the voltage
VCr is equal to the voltage V1；In the stage, energy and constant on the inductance Lr and capacitor Cr；
When boosting work, electric current iLr=I3=0, the anti-and diode D1 of the resonant inductance Lr, anti-simultaneously diode
The V2 that parallel resonance is negative until the voltage Cr occurs for D4 shutdown, the inductance Lr and capacitor Cr, described in the stage
Gross energy on inductance Lr and capacitor Cr is constant.
The another preferred method provided by the invention, when being depressured work in the 5th stage, the switching tube Q2
It is connected with switching tube Q3, the voltage VCr is the voltage V1, and the voltage on the inductance Lr is equal to input voltage V1, described
Inductance Lr electric current is linearly reduced to zero by negative I4 and then reversely increases to I5 again until I5 is greater than I4；
The stage is the process that the converter inputs to inductance supplement energy, and the inductance Lr electric current is since reversed I4
It is linearly reduced to zero and then reversely increases to I5, the output electric current of the converter is provided by filter capacitor C2；
When boosting work, the switching tube Q6 and switching tube Q7 conducting, the voltage V2 that the voltage Cr is negative are described
Voltage on inductance Lr is equal to negative input voltage, and the inductance Lr electric current linearly reversely increases, this stage is to input to electricity
The process of sense supplement energy, inductance Lr electric current reverse linear since I4 increase to I5, export electric current by filter capacitor C1
It provides.
Method described in another preferred one kind provided by the invention, when being depressured work in the 6th stage, the switch
Pipe Q2 and the switching tube Q3 are simultaneously turned off, and parallel resonance occurs for the inductance Lr and capacitor Cr until the switching tube Q9 is led
It is logical, the voltage V2 that the voltage VCr is negative；In the stage, the input terminal and output end of the converter do not have energy biography,
Output electric current is still provided by filter capacitor C2；The energy of the converter is transmitted between inductance and capacitor, the electricity
The gross energy felt on Lr and capacitor Cr is constant；
When boosting work, the switching tube Q6 and the 7th switching tube Q7 are simultaneously turned off, and the inductance Lr and capacitor Cr occur
Parallel resonance is the voltage V1 until the voltage VCr, and input terminal and output end do not have energy transmission in this stage, output
Electric current is still provided by filter capacitor C1, and energy is transmitted between inductance Lr and capacitor Cr, on the inductance and capacitor
Gross energy is constant.
Method described in another preferred one kind provided by the invention, when being depressured work in the 7th stage, the voltage
VCr is equal to negative the voltage V2, seven D7 of anti-and diode of anti-and diode six D6 and switching tube Q7 of the switching tube Q6
It is connected, it is institute that the electric current in the inductance Lr, which flows through the anti-and diode D7 of the anti-and diode D6 and switching tube Q7 of switching tube Q6,
Filter capacitor C2 charging is stated, and load current is provided；In the stage, the voltage VCr is remained unchanged, electric current on the inductance Lr
It is linear to reduce；The energy of the input of the converter be exactly be transmitted to inside at this stage load until the switching tube turn off
Terminate the stage；
When boosting work, the voltage VCr is equal to the voltage V1, the anti-and diode D2 and switch of the switching tube Q2
The anti-and diode D3 of pipe Q3 is connected, and the electric current in the inductance Lr flows through anti-and diode D2, and described instead simultaneously diode D3 gives
Filter capacitor C1 charging, and load current is provided, interior at this stage, the voltage VCr is remained unchanged, electric current on the inductance Lr
Linear to reduce, the energy of the input of the converter is transmitted to load until the inductive current is zero end at this stage.
Method described in another preferred one kind provided by the invention, when being depressured work in the 8th stage, the resonance
The electric current iLr of inductance Lr is equal to I7, the anti-and diode D6 of the voltage V2 that the voltage VCr is negative, the switching tube Q6
It is turned off with the anti-and diode D7 of switching tube Q7, parallel resonance occurs for the inductance Lr and capacitor Cr until the voltage VCr is
The negative voltage V1；In the stage, energy and constant on the inductance Lr and capacitor Cr；
When boosting work, the electric current iLr=I7=0, the voltage VCr of the resonant inductance Lr is the voltage V1, institute
Anti- and diode D2 and anti-and diode D3 shutdown are stated, parallel resonance occurs for the inductance Lr and capacitor Cr until the voltage
VCr is equal to the voltage V2, and in the stage, the gross energy on the inductance and capacitor is constant.
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, the present invention has to and fro flow of power ability, can be realized the different demands of boosting and decompression；
2, all switching tubes of the present invention can realize that Sofe Switch, diode are all zero-current switching, and seldom, efficiency is very for loss
Height is suitble to high power transmission；
3, switching frequency variation range of the present invention is smaller, is easy to optimization design magnetic element；
4, component used in the present invention is less, and the diode-built-in of switching tube is made full use of to use as rectifier diode.
Detailed description of the invention
Fig. 1 is LC two-way resonance DC/DC conversion device topological structure schematic diagram of the invention；
Fig. 2 is correlation element manipulation waveform diagram when converter of the invention works in decompression mode；
Fig. 3 is first stage operation mode figure when converter of the invention works in decompression mode；
Fig. 4 is eight stage work modal graphs second, four, 6 when converter of the invention works in decompression mode；
Fig. 5 is phase III operation mode figure when converter of the invention works in decompression mode；
Fig. 6 is the 5th stage work modal graph when converter of the invention works in decompression mode；
Fig. 7 is the 7th stage work modal graph when converter of the invention works in decompression mode；
Fig. 8 is correlation element manipulation waveform diagram when converter of the invention works in boost mode；
Fig. 9 is first stage operation mode figure when converter of the invention works in boost mode；
Figure 10 is eight stage work modal graphs second, four, 6 when converter of the invention works in boost mode；
Figure 11 is phase III operation mode figure when converter of the invention works in boost mode；
Figure 12 is the 5th stage work modal graph when converter of the invention works in boost mode；
Figure 13 is the 7th stage work modal graph when converter of the invention works in boost mode.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment 1:
As shown in figures 1-13, the invention LC parallel connection two-way resonance DC/DC converter of this example, the converter are suitable for high pressure
Large-power occasions；The converter includes sequentially connected converter module 1, resonant element and converter module 2；The variation
Device module 1 respectively includes DC power supply in parallel, filter capacitor and converter bridge arm with the converter module 2；The transformation
Device bridge arm is made of first to the 9th switching tube Q1~Q9 with backward dioded；The bridge arm includes two in parallel by two
The branch that a switching tube is composed in series；The resonant element is separately connected between two switching tubes in each branch.This hair
Bright LC parallel resonance two-way DC-DC converter connection direct-current input power supplying and load, resonant element connection first to the
The bridge arm that the bridge arm and the 5th to the 8th switching tube that four switching tubes are constituted are constituted.Resonant element is by an inductance Lr and a capacitor
Cr is composed in parallel.The series arm of first switch tube Q1 and third switching tube Q3 and the second switch Q2 and the 4th switching tube
Direct-current input power supplying is connected after the series arm of Q4 is parallel with one another.The series arm of 5th switching tube Q5 and the 7th switching tube Q7
The 9th switching tube Q9 and output are connect after parallel with one another with the series arm of the 6th switching tube Q6 and the 8th switching tube Q8
Filter capacitor.The first end of resonant element is connected in the abutment end of first switch tube Q1 and third switching tube Q3 while being connected in the 6th and opens
Close the abutment end of pipe Q6 and the 8th switching tube Q8；The second end of resonant element is connected in second switch Q2's and the 4th switching tube Q4
Abutment end is connected in the abutment end of the 5th the switching tube Q5 and the 7th switching tube Q7 simultaneously.9th switching tube Q9, mono- end Jie the 5th
The abutment end of switching tube Q5 and the 6th switching tube Q6, the another of the 9th switching tube Q9 terminate at the one of two C2 of filter capacitor
End.One end of 9th switching tube Q9 described in the first end Jie of two C2 of filter capacitor, the second end the filter capacitor C2 Jie institute
State the 7th switching tube Q7 and the 8th switching tube Q8 abutment end.
LC parallel resonance two-way DC-DC converter control method of the present invention is described in detail below.
When it works in decompression mode:
As shown in Figures 2 and 3, the first stage:
At the t0 moment, first switch tube Q1 and the 4th switching tube Q4 conducting, vCr=-V1, vCr are indicated in resonant element
The voltage of capacitor, V1 indicate the voltage of input DC power, are on first switch tube Q1 and the 4th switching tube Q4 when due to conducting
There is no voltage, it is achieved that the no-voltage of first switch tube Q1 and the 4th switching tube Q4 are connected.Input terminal current loop by
Direct-current input power supplying, first switch tube Q1, inductance Lr, the 4th switching tube Q4 are constituted, and the voltage on inductance Lr is equal to negative input
Voltage, inductive current are linearly reduced to zero by positive I0 and then reversely increase to I1 again, and final I1 is greater than I0, this stage is defeated
Enter to the process of inductance supplement energy, inductive current is linearly reduced to zero since positive I0 and then reversely increases to I1, exports
Electric current is provided by filter capacitor C2.
As shown in Figure 2 and Figure 4, second stage:
At the t1 moment, first switch tube Q1 and the 4th switching tube Q4 are simultaneously turned off, and hereafter inductance Lr and capacitor Cr occurs simultaneously
Join resonance, until the 9th switching tube Q9 is connected, vCr=V2 at this time, wherein V2 indicates output voltage, in this process input terminal
There is no energy transmission with output end, output electric current is still provided by filter capacitor C2.Energy between inductance Lr and capacitor Cr into
Row transmitting, but the gross energy on inductance Lr and capacitor Cr is constant.
As shown in Figure 2 and Figure 5, the phase III:
At the t2 moment, vCr=V2, the hereafter anti-and diode D5 and the 8th switching tube Q8 of the 5th switching tube Q5 anti-and two
Pole pipe D8 is connected, and the electric current in inductance flows through anti-and diode D5 and anti-and two poles of the 8th switching tube Q8 of the 5th switching tube Q5
Pipe D8 charges to filter capacitor C2, and provides load current.During this period of time, vCr is remained unchanged, and inductance Lr powers on cleanliness
It reduces.The energy of input is exactly to be transmitted to load during this period, this process just terminates until the 9th switching tube Q9 shutdown.
As shown in Figure 2 and Figure 4, fourth stage:
At the t3 moment, iLr=I3, vCr=V2, wherein iLr indicates that the electric current of resonant inductance Lr, I3 indicate resonant inductance Lr
In the electric current at t3 moment, hereafter the anti-and diode D8 of the anti-and diode D5 and the 8th switching tube Q8 of the 5th switching tube Q5 are closed
Disconnected, hereafter parallel resonance occurs for inductance Lr and capacitor Cr, until in vCr=V1, this period, energy on inductance Lr and capacitor Cr
Be constant.
As shown in Figure 2 and Figure 6, the 5th stage:
It is carved in t4, second switch Q2 and third switching tube Q3 conducting, vCr=V1, vCr indicate the capacitor in resonant element
The voltage of Cr, V1 indicate input DC power voltage, due to conducting when second switch Q2 and third switching tube Q3 on be not have
There is voltage, it is achieved that the no-voltage of second switch Q2 and third switching tube Q3 are connected.Input terminal current loop is by straight
Stream input power, second switch Q2, inductance, third switching tube Q3 are constituted, and the voltage on inductance Lr is equal to input voltage, inductance
Lr electric current is linearly reduced to zero by negative I4 and then reversely increases to I5 again, and final I5 is greater than I4, this stage is to input to electricity
The process of sense supplement energy, inductance Lr electric current are linearly reduced to zero since reversed I4 and then reversely increase to I5, export electric current
It is provided by filter capacitor C2.
As shown in Figure 2 and Figure 4, the 6th stage:
At the t5 moment, second switch Q2 and third switching tube Q3 are simultaneously turned off, and hereafter inductance Lr and capacitor Cr occurs simultaneously
Join resonance, until the 9th switching tube Q9 is connected, vCr=-V2 at this time, wherein V2 indicates output voltage, inputs in this process
End and output end do not have energy biography, and output electric current is still provided by filter capacitor C2.Energy is passed between inductance and capacitor
It passs, but the gross energy on inductance Lr and capacitor Cr is constant.
As shown in Figure 2 and Figure 7, the 7th stage:
At the t6 moment, vCr=-V2, hereafter anti-and diode six D6's and the 7th switching tube Q7 of the 6th switching tube Q6 is anti-
And seven D7 of diode is connected, the electric current in inductance Lr flows through the anti-and diode D6's and the 7th switching tube Q7 of the 6th switching tube Q6
Anti- and diode D7 charges to filter capacitor C2, and provides load current.During this period of time, vCr is remained unchanged, on inductance Lr
Electric current is linearly reduced.The energy of input is exactly to be transmitted to load during this period, this process is turned off until the 9th switching tube
Just terminate.
As shown in Figure 2 and Figure 4, the 8th stage:
At the t7 moment, iLr=I7, vCr=-V2, wherein iLr indicates that the electric current of resonant inductance Lr, I7 indicate resonant inductance
Electric current of the Lr at the t7 moment, hereafter the anti-and diode D7 of the anti-and diode D6 and the 7th switching tube Q7 of the 6th switching tube Q6 are closed
Disconnected, hereafter parallel resonance occurs for inductance Lr and capacitor Cr, until in vCr=-V1, this period, energy on inductance Lr and capacitor Cr
It measures and is constant.
When it works in boost mode:
As shown in Figure 8 and Figure 9, the first stage:
At the t0 moment, the 5th switching tube Q5 and the 8th switching tube Q8 conducting, vCr=V2, wherein vCr is indicated in resonant element
Capacitor voltage, V2 indicates the voltage of input DC power, do not have when conducting on the 5th switching tube Q5 and the 8th switching tube Q8
Voltage, realizes the no-voltage conducting of the 5th switching tube Q5 and the 8th switching tube Q8, and input terminal current loop inputs electricity by direct current
Source, nine Q9 of switching tube anti-and diode D9, the 5th switching tube Q5, inductance Lr, the 8th switching tube Q8 are constituted, the electricity on inductance Lr
Pressure is equal to input voltage, and inductive current linearly increases, this stage is the process for inputing to inductance supplement energy, inductive current
I1 is increased linearly to since I0, output electric current is provided by filter capacitor.
As shown in figs, second stage:
At the t1 moment, the 5th switching tube Q5 and the 8th switching tube Q8 are simultaneously turned off, inductance Lr, and capacitor Cr occurs in parallel humorous
Vibration, until vCr=-V1, wherein V1 indicates output voltage, and input terminal and output end do not have energy transmission in this process, defeated
Electric current is still provided by filter capacitor C1 out, and energy is transmitted between inductance Lr and capacitor Cr, but on inductance and capacitor
Gross energy is constant.
As shown in Figure 8 and Figure 11, the phase III:
At the t2 moment, vCr=-V1, hereafter the anti-and diode D1 and the 4th switching tube Q4 of first switch tube Q1 it is anti-simultaneously
Diode D4 is connected, and the electric current in inductance Lr flows through anti-and diode D1, and anti-and diode D4 gives filter capacitor C1 charging, and mentions
For load current, during this period of time, vCr is remained unchanged, and inductance Lr powers on cleanliness reduction, and the energy of input is in this period
In be transmitted to load, this process is zero end until inductance Lr electric current.
As shown in figs, fourth stage:
At the t3 moment, iLr=I3=0, vCr=V1, wherein iLr indicates that the electric current of resonant inductance Lr, I3 indicate resonance electricity
Feel electric current of the Lr at the t3 moment, hereafter anti-and diode D1, anti-and diode D4 shutdown realizes the zero current of rectifier diode
Shutdown, hereafter parallel resonance occurs for inductance Lr and capacitor Cr, until in vCr=-V2, this period, on inductance Lr and capacitor Cr
Gross energy it is constant.
As shown in figs. 8 and 12, the 5th stage:
At the t4 moment, the 6th switching tube Q6 and the 7th switching tube Q7 conducting, vCr=-V2, when conducting the 6th switching tube Q6 and
No voltage on 7th switching tube Q7 realizes the no-voltage conducting of the 6th switching tube Q6 and the 7th switching tube Q7, input terminal electricity
Flow back to routing direct-current input power supplying, anti-and the diode D9, the 6th switching tube Q6, inductance Lr of nine Q9 of switching tube, the 7th switching tube
Q7 is constituted, and the voltage on inductance Lr is equal to negative input voltage, and inductance Lr electric current linearly reversely increases, this stage is to input to
Inductance supplements the process of energy, and inductance Lr electric current reverse linear since I4 increases to I5, and output electric current is mentioned by filter capacitor C1
For.
As shown in figs, the 6th stage:
At the t5 moment, the 6th switching tube Q6 and the 7th switching tube Q7 are simultaneously turned off, and hereafter inductance Lr and capacitor Cr occurs simultaneously
Join resonance, until vCr=V1, input terminal and output end do not have energy transmission in this process, export electric current still by filtering
Capacitor C1 is provided, and energy is transmitted between inductance Lr and capacitor Cr, but the gross energy on inductance and capacitor is constant.
As shown in figure 8 and 13, the 7th stage:
At the t6 moment, vCr=V1, the hereafter anti-and diode D2 and third switching tube Q3 of second switch Q2 anti-and two
Pole pipe D3 is connected, and the electric current in inductance Lr flows through anti-and diode D2, and anti-and diode D3 gives filter capacitor C1 charging, and provides
Load current, during this period of time, vCr remain unchanged, and inductance Lr powers on cleanliness reduction, and the energy of input is during this period
It is transmitted to load, this process is zero end until inductive current.
As shown in figs, the 8th stage:
At the t7 moment, iLr=I7=0, vCr=V1, I7 indicate electric current of the resonant inductance Lr at the t7 moment, hereafter anti-and two
Pole pipe D2 and anti-and diode D3 shutdown, realize the zero-current switching of rectifier diode, hereafter inductance Lr and capacitor Cr occurs
Parallel resonance, until in vCr=V2, this period, the gross energy on inductance and capacitor is constant.
Such as controlled resonant converter, it works in boost mode:
Input voltage V1 is 100V, output voltage 1kV, output power 1kW, and resonant inductance Lr is 630uH, resonance electricity
Appearance Cr is 0.5uF, and duty cycle 170uS, all switching tubes realize no-voltage conducting and near zero voltage turns off, rectification
Diode is zero-current switching, and very little is lost, and efficiency is very high.
Such as controlled resonant converter, it works in decompression mode:
Input voltage V1 is 300V, output voltage 20V, output power 40W, and resonant inductance Lr is 3.6mH, resonance electricity
Appearance Cr be 0.23uF, duty cycle 440uS, all switching tubes realize near zero voltage shutdown, rectifier diode zero
Switch off current, is lost very little, and efficiency is very high.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (1)
1. a kind of control method of LC parallel connection two-way resonance DC/DC converter, the converter is suitable for high-power situation；
It is characterized by: the converter includes sequentially connected converter module 1, resonant element and converter module 2；The transformation
Device module 1 respectively includes DC power supply in parallel, filter capacitor and converter bridge arm with the converter module 2；The bridge arm
Including two branches being composed in series by two switching tubes in parallel；The resonant element is separately connected in each branch
Between two switching tubes；
Each switching tube has the diode of reverse parallel connection；Branch in the converter module 1 includes concatenated switch
Pipe Q2 and switching tube Q4 and concatenated switching tube Q1 and switching tube Q3；Branch in the converter module 2 includes concatenated
Switching tube Q6 and switching tube Q8 and concatenated switching tube Q5 and switching tube Q7；The resonant element include in parallel inductance Lr and
Capacitor Cr；The first end of the resonant element is separately connected between switching tube Q1 and Q3 between switching tube Q6 and Q8；It is described humorous
The second end of vibration unit is separately connected between switching tube Q2 and Q4 between switching tube Q5 and Q7；
Tandem tap pipe Q9, the switching tube Q9 are reversed between converter bridge arm and its filter capacitor in the converter module 2
Parallel diode D9；
The method includes 8 stages；When being depressured work in the first phase, the switching tube Q1 and switching tube Q4 conducting, institute
State the voltage V1 of the DC power supply for the converter module 1 that the voltage VCr of capacitor Cr is negative；
The inductance Lr electric current is by positive I0It is linearly reduced to zero and then reversely increases to I again1Until I1Greater than I0It is to input to electricity
The process of sense supplement energy, output electric current are provided by filter capacitor C2；
When boosting work, the switching tube Q5 and switching tube Q8 are connected, and the voltage VCr of the capacitor in the resonant element is described
Voltage on the voltage V2, the inductance Lr of the DC power supply of converter module 2 is equal to input voltage, and inductive current linearly increases
Add；The stage is the process for inputing to inductance supplement energy, and inductive current is from I0Start to increase linearly to I1, electric current is exported by filtering
Wave capacitor provides；
When being depressured work in second stage, the switching tube Q1 and switching tube Q4 are simultaneously turned off, the inductance Lr and capacitor Cr
Parallel resonance occurs until the switching tube Q9 is connected, the voltage VCr of the capacitor Cr is equal to the voltage V2；In the stage,
The input terminal and output end of the converter do not have energy transmission, and output electric current is still provided by filter capacitor C2；Converter
Energy is transmitted between the inductance Lr and capacitor Cr, but the gross energy on inductance Lr and capacitor Cr is constant；
When boosting work, the switching tube Q5 and switching tube Q8 are simultaneously turned off, and parallel resonance occurs for the inductance Lr and capacitor Cr
Until the voltage V1 that the voltage VCr is negative；The input terminal and output end of converter described at this stage do not have energy
Transmission, output electric current are still provided by filter capacitor C1, and energy is transmitted between the inductance Lr and capacitor Cr, the electricity
The gross energy for feeling Lr and capacitor Cr is constant；
When being depressured work in the phase III, the anti-and diode D8 of the anti-and diode D5 and switching tube Q8 of the switching tube Q5
It is connected, the electric current in the inductance Lr flows through the anti-and diode D8 of the anti-and diode D5 and switching tube Q8 of switching tube Q5 for filter
Wave capacitor C2 charging, and load current is provided；In the stage, the voltage of the capacitor Cr is remained unchanged, and the inductance Lr is powered on
Cleanliness is reduced；The energy of converter input is exactly to be transmitted to terminating until the switching tube Q9 is turned off for load at this stage；
When boosting work, the anti-and diode D4 conducting of the anti-and diode D1 and switching tube Q4 of the switching tube Q1, the electricity
Electric current in sense Lr flows through anti-and diode D1, and the anti-and diode D4 charges to filter capacitor C1, and provides load current,
In at this stage, the voltage VCr is remained unchanged, and the inductance Lr powers on cleanliness reduction, the energy of the converter input
Load is transmitted at this stage until the inductance Lr electric current is zero end；
When being depressured work in fourth stage, the electric current iLr of the resonant inductance Lr is I3, the voltage VCr of the capacitor Cr is institute
Output voltage V2 is stated, the anti-and diode D8 shutdown of the anti-and diode D5 and the switching tube Q8 of the switching tube Q5 are described
Parallel resonance occurs for inductance Lr and capacitor Cr until the voltage VCr is equal to the voltage V1；In the stage, the inductance Lr and
Energy and constant on capacitor Cr；
When boosting work, the electric current iLr=I of the resonant inductance Lr3=0, the anti-and diode D1, anti-and diode D4 are closed
Disconnected, the V2 that parallel resonance is negative until the voltage VCr occurs for the inductance Lr and capacitor Cr, in the stage, the electricity
The gross energy felt on Lr and capacitor Cr is constant；
When being depressured work in the 5th stage, the switching tube Q2 and switching tube Q3 conducting, the voltage VCr is the voltage
Voltage on V1, the inductance Lr is equal to input voltage V1, and the inductance Lr electric current is by negative I4It is linear to be reduced to zero then again
Reversely increase to I5Until I5Greater than I4；
The stage is the process that the converter inputs to inductance supplement energy, and the inductance Lr electric current is from reversed I4Start linear
It is reduced to zero and then reversely increases to I5, the output electric current of the converter provides by filter capacitor C2；
When boosting work, the switching tube Q6 and switching tube Q7 conducting, the voltage V2 that the voltage VCr is negative, the electricity
The voltage felt on Lr is equal to negative input voltage, and the inductance Lr electric current linearly reversely increases, this stage is to input to inductance
The process of energy is supplemented, the inductance Lr electric current is from I4Starting reverse linear increases to I5, export electric current and mentioned by filter capacitor C1
For；
When being depressured work in the 6th stage, the switching tube Q2 and the switching tube Q3 are simultaneously turned off, the inductance Lr and electricity
Appearance Cr generation parallel resonance is connected until the switching tube Q9, the voltage V2 that the voltage VCr is negative；In the stage, institute
The input terminal and output end for stating converter do not have energy biography, and output electric current is still provided by filter capacitor C2；The converter
Energy is transmitted between inductance and capacitor, and the gross energy on the inductance Lr and capacitor Cr is constant；
When boosting work, the switching tube Q6 and the 7th switching tube Q7 are simultaneously turned off, and the inductance Lr is in parallel with capacitor Cr generation
Resonance is the voltage V1 until the voltage VCr, and input terminal and output end do not have energy transmission in this stage, exports electric current
It is still provided by filter capacitor C1, energy is transmitted between inductance Lr and capacitor Cr, on the inductance Lr and capacitor Cr
Gross energy is constant；
When being depressured work in the 7th stage, the voltage VCr is equal to the negative voltage V2, the switching tube Q6 anti-and two
The anti-and diode D7 of pole pipe D6 and switching tube Q7 is connected, and the electric current in the inductance Lr flows through the anti-and diode of switching tube Q6
The anti-and diode D7 of D6 and switching tube Q7 is filter capacitor C2 charging, and provides load current；In the stage, the electricity
Pressure VCr is remained unchanged, and the inductance Lr powers on cleanliness reduction；The energy of the input of the converter be exactly at this stage lining
Be transmitted to load just terminates the stage until the switching tube turns off；
When boosting work, the voltage VCr is equal to the voltage V1, the anti-and diode D2 and switching tube Q3 of the switching tube Q2
Anti- and diode D3 be connected, the electric current in the inductance Lr flows through anti-and diode D2, and the anti-and diode D3 is to filtering
Capacitor C1 charging, and load current is provided, interior at this stage, the voltage VCr is remained unchanged, and the inductance Lr powers on cleanliness
It reduces, the energy of the input of the converter is transmitted to load until inductive current is zero end at this stage；
When being depressured work in the 8th stage, the electric current iLr of the resonant inductance Lr is equal to I7, the voltage VCr is negative described
The anti-and diode D7 of the anti-and diode D6 and switching tube Q7 of voltage V2, the switching tube Q6 are turned off, the inductance Lr and electricity
Hold Cr and the voltage V1 that parallel resonance is negative until the voltage VCr occurs；In the stage, on the inductance Lr and capacitor Cr
Energy and constant；
When boosting work, the electric current iLr=I of the resonant inductance Lr7=0, the voltage VCr are the voltage V1, it is described it is anti-simultaneously
Parallel resonance occurs for diode D2 and anti-and diode D3 shutdown, the inductance Lr and capacitor Cr until the voltage VCr is equal to
The voltage V2, in the stage, the gross energy on the inductance Lr and capacitor Cr is constant.
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| CN101577489A (en) * | 2009-05-14 | 2009-11-11 | 湖南银河电气有限公司 | Soft switching converter suitable for sensitive bidirectional current loads |
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| TWI397250B (en) * | 2009-04-28 | 2013-05-21 | Univ Southern Taiwan | Two way full bridge zero-voltage and zero-current switching dc-dc converter |
| US8363427B2 (en) * | 2010-06-25 | 2013-01-29 | Greecon Technologies Ltd. | Bi-directional power converter with regulated output and soft switching |
| US8988900B2 (en) * | 2011-06-03 | 2015-03-24 | Texas A&M University System | DC capacitor-less power converters |
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