CN102111074A - Method and device for reducing switching loss of phase-shifting full-bridge converter - Google Patents
Method and device for reducing switching loss of phase-shifting full-bridge converter Download PDFInfo
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- CN102111074A CN102111074A CN2011100788478A CN201110078847A CN102111074A CN 102111074 A CN102111074 A CN 102111074A CN 2011100788478 A CN2011100788478 A CN 2011100788478A CN 201110078847 A CN201110078847 A CN 201110078847A CN 102111074 A CN102111074 A CN 102111074A
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Abstract
The invention provides a method and a device for reducing the switching loss of a phase-shifting full-bridge converter. The device comprises a resonant capacitor voltage detection unit, a judgment unit, a control arithmetic unit and a signal production unit, wherein the signal production unit comprises a phase-shifting signal production unit, a dead zone signal production unit and a phase-shifting trigger pulse production unit. The method comprises the following steps of: detecting resonant capacitor voltage signals by the resonant capacitor voltage detection unit; judging the size of the voltage signals by the judgment unit; calculating the optimum dead zone time of an upper switching tube and a lower switching tube of the same bridge arm in two bridge arms by the control arithmetic unit; and producing phase-shifting trigger pulse signals by the signal production unit to ensure that the withstand voltage is the lowest when the switching tubes are switched on, so the aim of reducing the switching loss is achieved. A phase-shifting control technique which is fixed relative to the dead zone time can provide the optimum dead zone time, and according to the technique, the switching loss is reduced to the lowest, the soft switching range is enlarged, and the working efficiency of the converter is improved; and the phase-shifting control technique is particularly suitable for high-power phase-shifting full-bridge converters.
Description
Technical field
The present invention relates to direct current DC-DC converter converter technique field, particularly relate to the method and the device that reduce the phase-shifted full-bridge converter switching loss.
Background technology
Along with the release of full-bridge ZVS phase shift technology, this technology has obtained using widely in high-power field.By in phase-shifted full-bridge converter, introducing resonant inductance and Dead Time, make switching tube realize that no-voltage is open-minded, but switching tube is difficult to realize that no-voltage is open-minded when underloading, still has bigger switching loss, is not suitable for load and the bigger occasion of mains fluctuations scope.
Converter lagging leg under the underloading situation is difficult to realize ZVS, the Dead Time of this and resonant inductance, resonant capacitance size and switching tube trigger impulse has relation, and leading arm is easy to realize ZVS, this is because when switching tube turn-offs on the leading arm, output filter also participates in resonance, has enough big electric currents to finish leading arm is leaked discharging and recharging of last two resonant capacitances.
The basic reason that causes this problem is the defective of PSFB-ZVS converter topology structure itself, has problems such as loading range that soft switch realizes and duty-cycle loss, and the factor that influences these problems is resonant inductance and resonant capacitance.Usually the Dead Time that adopts is fixed, and when resonant parameter changed, converter lagging leg pipe can not be finished no-voltage when underloading even heavy duty open-minded.
Summary of the invention
The objective of the invention is to overcome the prior art above shortcomings, the method and the device that reduce the phase-shifted full-bridge converter switching loss are provided, concrete technical scheme is as follows.
Reduce the device of phase-shifted full-bridge converter switching loss, it comprises: resonant capacitance voltage detection unit, judging unit, control and calculation unit and the signal generating unit of Lian Jieing in turn, and signal generating unit comprises phase shift signal generating unit, dead band signal generating unit and phase shift trigger impulse generating unit; The resonant capacitance voltage detection unit detects the resonant capacitance voltage signal and transforms this signal delivers to judging unit; Type under the signal of judgment unit judges resonant capacitance voltage detection unit conversion; Control and calculation unit calculates the optimum dead zone time according to the judgment unit judges signal type; Signal generating unit output phase-shifting full-bridge two brachium pontis that control and calculation unit calculated are managed the phase shift trigger impulse of the Dead Time of switch up and down.
In the device of above-mentioned reduction phase-shifted full-bridge converter switching loss, described resonant capacitance voltage detection unit comprises with phase-shifting full-bridge two brachium pontis manages two first series resistance and second series resistances that resonant capacitance is in parallel down, two level shifting circuits and the memory cell of sampling; First series resistance comprises first divider resistance and second divider resistance of series connection, and second series resistance comprises the 3rd divider resistance and the 4th divider resistance of series connection; First divider resistance, one end ground connection, the other end is connected with second divider resistance, one end; Described the 3rd divider resistance one end ground connection, the other end is connected with the 4th divider resistance one end.
In the device of above-mentioned reduction phase-shifted full-bridge converter switching loss, described level shifting circuit comprises two cascade discharge circuits: first order through transport discharge road and second level through transport discharge road; Wherein first order through transport discharge road comprises that first amplifier, second amplifier, the first amplifier end of oppisite phase input resistance, the first amplifier positive terminal input resistance, the first feedback adjustable resistance, the first amplifier end of oppisite phase land resistance, the second amplifier end of oppisite phase input resistance, the second amplifier positive terminal input resistance, second feedback resistance and the second amplifier end of oppisite phase and land circuit; Described second level through transport discharge road comprises that the 3rd amplifier, four high guaily unit, the 3rd amplifier end of oppisite phase input resistance, the 3rd amplifier positive terminal input resistance, the 3rd feedback adjustable resistance, the 3rd amplifier end of oppisite phase land circuit, four high guaily unit end of oppisite phase input resistance, four high guaily unit positive terminal input resistance, the 4th feedback resistance and four high guaily unit end of oppisite phase earth resistance.
In the device of above-mentioned reduction phase-shifted full-bridge converter switching loss, in the first order through transport discharge road, the first amplifier end of oppisite phase input resistance, one end, first divider resistance, one end is connected with second divider resistance, one end, the first amplifier end of oppisite phase input resistance other end, the inverting input of first feedback adjustable resistance one end and first amplifier is connected, the first amplifier positive terminal input resistance, one end, the first amplifier end of oppisite phase lands the normal phase input end of resistance one end and first amplifier and is connected, the first amplifier end of oppisite phase lands resistance other end ground connection, and the first amplifier positive terminal input resistance other end connects reference voltage V
Ref1The output of the second amplifier end of oppisite phase input resistance, one end, first amplifier is connected with the first feedback adjustable resistance other end, the inverting input of the second amplifier end of oppisite phase input resistance other end, second feedback resistance, one end and second amplifier is connected, the second amplifier positive terminal input resistance, one end, the second amplifier end of oppisite phase land the normal phase input end of circuit one end and first amplifier and are connected, the second amplifier end of oppisite phase lands circuit other end ground connection, and the second amplifier positive terminal input resistance other end connects another reference voltage V
Ref2In the through transport discharge road, the described second level, the 3rd amplifier end of oppisite phase input resistance one end, the 3rd divider resistance one end and the 4th divider resistance one end are connected, the inverting input of the 3rd amplifier end of oppisite phase input resistance other end, the 3rd feedback adjustable resistance one end and the 3rd amplifier is connected, the 3rd amplifier positive terminal input resistance one end, the 3rd amplifier end of oppisite phase land the normal phase input end of circuit one end and the 3rd amplifier and are connected, the 3rd amplifier end of oppisite phase lands circuit other end ground connection, and the first amplifier positive terminal input resistance other end connects reference voltage V
Ref1', the output of four high guaily unit end of oppisite phase input resistance one end, first amplifier is connected with the 3rd feedback adjustable resistance other end, the inverting input of the four high guaily unit end of oppisite phase input resistance other end, the 4th feedback resistance one end and second amplifier is connected, and the four high guaily unit positive terminal input resistance other end connects reference voltage V
Ref2', the second feedback resistance other end is connected with the output of second amplifier, and the 4th feedback resistance other end is connected with the output of four high guaily unit.
In the device of above-mentioned reduction phase-shifted full-bridge converter switching loss, adopt the signal of memory cell incoming level change-over circuit to store, for judging unit provides digital signal, adopt a receiving terminal of memory cell to be connected with the output of second amplifier, another receiving terminal is connected with the output of four high guaily unit.
In the device of above-mentioned reduction phase-shifted full-bridge converter switching loss, sampling memory cell and judging unit, control and calculation unit and signal generating unit adopt the TMS320F2812DSP of TI company to realize.
Utilize said apparatus to reduce the method for phase-shifted full-bridge converter switching loss, comprise the steps:
(1) the resonant capacitance voltage detection unit is delivered to judging unit after detecting conversion resonant capacitance voltage signal;
(2) utilize in the phase-shifted full-bridge converter that judgment unit judges detects by detecting unit the two brachium pontis type of pipe resonant capacitance voltage signal down;
(3) control and calculation unit is according to the optimum dead zone time of two switching tubes about the same brachium pontis in real-time respectively calculating two brachium pontis of the type of judgment unit judges; Described Dead Time comprises the Dead Time between two switching tubes up and down of leading arm and lagging leg in the same brachium pontis of phase-shifting full-bridge, and the optimum dead zone time of two brachium pontis independently produces;
(4) Dead Time that produces through signal generating unit is that the phase shift trigger impulse of optimum dead zone time bears the voltage minimum when switching tube is opened, thereby reduces the switching loss of switching tube.
In the above-mentioned method, judgment unit judges two brachium pontis are managed the size of resonant capacitance voltage down in the step (2), classify then; Control and calculation unit to the classification of pipe resonant capacitance voltage swing down of two brachium pontis, calculates in two brachium pontis same brachium pontis optimum dead zone time of two switching tubes up and down according to judging unit in real time in the step (3).
In the above-mentioned method, the dead band signal that the dead band signal generating unit produces in the step (4) is that a series of Dead Times are the pulse of optimum dead zone time, by this series of pulses being injected in the described phase-shift pulse generating unit, produce the phase-shift pulse signal of Adjustable real-time and Dead Time the best.
In the above-mentioned method, step (4) phase-shift pulse generating unit is by Collaborative Control, and the control optimum dead zone time can be in harmonious proportion controls the trigger impulse phase shift.
In the above-mentioned method, step (1) sampling is stored rule and is, under the normal operating conditions, has no progeny when leading arm switch pipe closes in the monocycle, begins sampling, and timing, up to all open-minded with another switching tube of brachium pontis, and duration Δ t, sampling number 50; The sampling of switch monocycle continues 1/6 power frequency period, promptly samples for totally 6 times in a power frequency period; A power frequency period storage data update all once.
In the above-mentioned method, the dead band signal generating unit adopts the TMS320F2812DSP of TI company, and it is a series of pulses of switching frequency for optimum dead zone time, frequency that the dead band signal generating unit goes out size according to resonant capacitance voltage signal classified calculating.
Compared with prior art, the present invention is according to voltage variation tendency on the switching tube, Dead Time by real-time adjustment leading-bridge and lagging leg, need not too pay close attention to whether matching problem of resonant parameter, enlarge the realization scope of soft switch, make the switching loss minimum of switching tube, reach and reduce switching tube loss purpose, improve the efficient of converter.The resonant capacitance voltage signal that the present invention detects by the resonant capacitance voltage detection unit, judge the size of this voltage signal then by judging unit, again by the optimum dead zone time of control and calculation unit calculating with brachium pontis two switching tubes, when the trigger impulse of the optimum dead zone time that signal generating unit produces is opened switching tube, bear the voltage minimum, thereby reach the purpose that reduces switching loss.
Description of drawings
Fig. 1 is the flow chart of control method of the present invention.
Fig. 2 is the circuit diagram of resonant capacitance voltage detection unit.
Fig. 3 is the judging unit program flow diagram.
Fig. 4 a and Fig. 4 b are the optimum dead zone time waveform figures of leading arm switch pipe switch.
Fig. 4 c and Fig. 4 d are the optimum dead zone time waveform figures of lagging leg switching tube switch.
Fig. 5 is fixing tube voltage oscillogram under the driving voltage during Dead Time and the lagging leg.
Fig. 6 is that the present invention adopts Dead Time to adjust tube voltage oscillogram under rear drive voltage and the lagging leg in real time.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is described further, but enforcement of the present invention and protection range are not limited thereto.
As Fig. 1, reduce the device of phase-shifted full-bridge converter switching loss, it comprises: resonant capacitance voltage detection unit, judging unit, control and calculation unit and the signal generating unit of Lian Jieing in turn, and signal generating unit comprises phase shift signal generating unit, dead band signal generating unit and phase shift trigger impulse generating unit; The resonant capacitance voltage detection unit detects the resonant capacitance voltage signal and transforms this signal delivers to judging unit; Type under the signal of judgment unit judges resonant capacitance voltage detection unit conversion; Control and calculation unit calculates the optimum dead zone time according to the judgment unit judges signal type; Signal generating unit output phase-shifting full-bridge two brachium pontis that control and calculation unit calculated are managed the phase shift trigger impulse of the Dead Time of switch up and down.
As Fig. 2, described resonant capacitance voltage detection unit comprises with phase-shifting full-bridge two brachium pontis manages two resonant capacitance (C down
3, C
4) first series resistance and second series resistance in parallel, two level shifting circuits and the memory cell of sampling; First series resistance comprises the first divider resistance R of series connection
D1With the second divider resistance R
D2, second series resistance comprises the 3rd divider resistance R of series connection
D3With the 4th divider resistance R
D4The first divider resistance R
D1One end ground connection, the other end and the second divider resistance R
D2One end connects; Described the 3rd divider resistance R
D3One end ground connection, the other end and the 4th divider resistance R
D4One end connects.
Described level shifting circuit comprises two cascade discharge circuits: first order through transport discharge road and second level through transport discharge road; Wherein first order through transport discharge road comprises the first amplifier A
1, the second amplifier A
2, the first amplifier end of oppisite phase input resistance R
1, the first amplifier positive terminal input resistance R
2, the first feedback adjustable resistance R
3, the first amplifier end of oppisite phase lands resistance R
4, the second amplifier end of oppisite phase input resistance R
5, the second amplifier positive terminal input resistance R
6, the second feedback resistance R
7Land circuit R with the second amplifier end of oppisite phase
8Through transport discharge road, the described second level comprises the 3rd amplifier, four high guaily unit, the 3rd amplifier end of oppisite phase input resistance R
1', the 3rd amplifier positive terminal input resistance R
2', the 3rd feedback adjustable resistance R
3', the 3rd amplifier end of oppisite phase lands circuit R
4', four high guaily unit end of oppisite phase input resistance R
5', four high guaily unit positive terminal input resistance R
6', the 4th feedback resistance R
7' and four high guaily unit end of oppisite phase earth resistance R
8'.
In the first order through transport discharge road, the first amplifier end of oppisite phase input resistance R
1One end, the first divider resistance R
D1One end and the second divider resistance R
D2One end connects, the first amplifier end of oppisite phase input resistance R
1The other end, the first feedback adjustable resistance R
3One end and the first amplifier A
1Inverting input connect the first amplifier positive terminal input resistance R
2One end, the first amplifier end of oppisite phase land resistance R
4One end and the first amplifier A
1Normal phase input end connect, the first amplifier end of oppisite phase lands resistance R
4Other end ground connection, the first amplifier positive terminal input resistance R
2The other end connects reference voltage V
Ref1, the second amplifier end of oppisite phase input resistance R
5One end, the first amplifier A
1The output and the first feedback adjustable resistance R
3The other end connects, the second amplifier end of oppisite phase input resistance R
5The other end, the second feedback resistance R
7One end and the second amplifier A
2Inverting input connect the second amplifier positive terminal input resistance R
6One end, the second amplifier end of oppisite phase land circuit R
8One end and the first amplifier A
1Normal phase input end connect, the second amplifier end of oppisite phase lands circuit R
8Other end ground connection, the second amplifier positive terminal input resistance R
6The other end connects another reference voltage V
Ref2, in the described second level through transport discharge road, the 3rd amplifier end of oppisite phase input resistance R
1' one end, the 3rd divider resistance R
D3One end and the 4th divider resistance R
D4One end connects, the 3rd amplifier end of oppisite phase input resistance R
1' other end, the 3rd feedback adjustable resistance R
3' one end and the 3rd amplifier A
3Inverting input connect the 3rd amplifier positive terminal input resistance R
2' one end, the 3rd amplifier end of oppisite phase land circuit R
4' one end and the 3rd amplifier A
3Normal phase input end connect, the 3rd amplifier end of oppisite phase lands circuit R
4' other end ground connection, the first amplifier positive terminal input resistance R
2The other end connects reference voltage V
Ref1', four high guaily unit end of oppisite phase input resistance R
5' one end, the first amplifier A
1Output and the 3rd feedback adjustable resistance R
3' other end connection, four high guaily unit end of oppisite phase input resistance R
5' other end, the 4th feedback resistance R
7' one end and the second amplifier A
2Inverting input connect four high guaily unit positive terminal input resistance R
6' other end connection reference voltage V
Ref2', the second feedback resistance R
7The other end is connected with the output of second amplifier, the 4th feedback resistance R
7' other end is connected with the output of four high guaily unit.
Phase-shifted full-bridge converter in the Dead Time that switching tube all turn-offs, utilizes resonant inductance L by introducing resonant inductance
rAnd resonant capacitance (C
1～C
4) voltage step evolution not, realize that no-voltage is open-minded.When converter is in underloading, L
rCan not finish C
rDischarge and recharge, the pipe that therefore lags behind can not be realized the ZVS conducting; If resonant inductance L
rAnd C
rParameter does not match, and may there be potential path (sneak circuit) in circuit so, improper operation mode occurs, will cause the switching tube of lagging leg to be difficult to realize ZVS.Above situation all can not realize that ZVS increases switching loss because of switching tube.
Switching loss is determined by following expression formula:
i
p: the primary resonant inductive current.
Δ t turn-offs the time that another switching tube is opened with the brachium pontis switching tube.
The solution of the present invention is, still be that the circuit resonance parameter does not match under the situation no matter circuit is in underloading, before the lagging leg switching tube turn-offs, and detection resonant capacitance C
3Voltage
Have no progeny in the lagging leg pass, during the primary inductance current over-zero, detect resonant capacitance C
4Voltage
Judge respectively
Residing Status Type, real-time regulated be with brachium pontis switching tube Dead Time, the voltage minimum when switching tube is opened, and this moment, the junction capacitance electric current of switching tube parallel connection can not go up therewith, promptly guaranteed the switching loss minimum.
Fig. 1 is the flow chart of control method of the present invention.Sampling memory cell and judging unit, control and calculation unit and signal generating unit adopt the TMS320F2812DSP of TI company.Detecting unit detects phase-shifted full-bridge converter two brachium pontis pipe resonant capacitance (C down
3, C
4) voltage, level shifting circuit is 0～3V with voltage transitions, and delivers to the A/D interface of TMS320F2812 DSP, starts sampling, reads AdcRegs.RESULTX.Rule is stored in sampling, under the normal operating conditions, has no progeny when leading arm switch pipe closes in the monocycle, begins sampling and timing t
1, all open-minded up to another to switching tube, duration Δ t, sampling number 50; Switch monocycle sampling continues 1/6 power frequency period, promptly in power frequency period totally 6 times; A power frequency period storage data update all once.
Program judgment unit judges resonant capacitance C among the DSP
3, C
4Voltage
With
(1) judges lagging leg resonant capacitance C
3Voltage
Before lagging leg turn-offs, judge
Type under the size;
(2) judge leading arm resonant capacitance C
4Voltage
Have no progeny in hysteresis switching tube pass, judge i
pDrop to the resonant capacitance C in zero moment
4Voltage
Type under the size;
Referring to Fig. 3, when resonant capacitance voltage
The time, it is judged to the I class; Resonant capacitance voltage
It is judged to the II class; Further judge, if resonant capacitance voltage
Then it is judged to the III class, if
Then it is judged to the IV class.Control and calculation unit is according to result (the resonant capacitance C of back judging unit real-time judge
3, C
4Voltage
Type under the voltage), calculate lagging leg and leading arm optimum dead zone time respectively.
II class: have no progeny in leading arm (lagging leg) switching tube pass, at resonant capacitance C
3(C
4) voltage
First minimum point place opens with another switching tube of brachium pontis, i.e. t
3Constantly open the lagging leg switching tube.Leading arm: t in Fig. 4 a, 0＜t≤T/2
d=Δ t
2=t
1-t
0Lagging leg: t in Fig. 4 c, T/2＜t＜T
d=Δ t
2=t
3-t
2
III class: close the resonant capacitance C that has no progeny at leading arm (lagging leg) switching tube
3(C
4) voltage
Reduce to
The time, open another switching tube, i.e. t
4Constantly open the lagging leg switching tube.Leading arm: t in Fig. 4 a, 0＜t≤T/2
d=Δ t
3=t
3-t
0Lagging leg: t in Fig. 4 c, T/2＜t＜T
d'=Δ t
3'=t
4-t
2
IV class: at resonant capacitance C
3(C
4) voltage
Open leading arm (lagging leg) switching tube after reducing to zero.Leading arm in Fig. 4 b, 0＜t≤T/2: get
Lagging leg in Fig. 4 (d), T/2＜t＜T: get
Fig. 4 is under II, III, the IV class situation
With the primary inductance current waveform.Dotted portion is the resonant capacitance C of Dead Time when enough big
3(C
4) voltage
Waveform, solid line are partly opened leading arm (lagging leg) switching tube by calculating the optimum dead zone time
Waveform.
According to the optimum dead zone time of calculating, dead band signal phonation unit directly generates the train pulse that the high frequency width is an optimum dead zone time size.
Adopt cooperative control method, DSP produces phase shift signal simultaneously according to load and input variation, the phase shift signal pulse is injected in dead band time series pulse generate the phase shift trigger impulse that Dead Time is adjusted in real time.
According to above experimental verification, Fig. 5 manages the fixedly driving voltage V of Dead Time under the lagging leg
gWith resonance capacitance voltage V
C4Oscillogram, Fig. 6 is that lagging leg is managed Dead Time real-time regulated rear drive voltage V down after adopting the present invention
gWith voltage V
C4Oscillogram, comparison diagram 5 and Fig. 6 as can be known, under identical ruuning situation, method of the present invention has reduced the voltage when switching tube is opened, thereby reduces the switching loss of phase-shifted full-bridge converter greatly.
Claims (10)
1. reduce the device of phase-shifted full-bridge converter switching loss, it is characterized in that comprising: resonant capacitance voltage detection unit, judging unit, control and calculation unit and the signal generating unit of Lian Jieing in turn, signal generating unit comprises phase shift signal generating unit, dead band signal generating unit and phase shift trigger impulse generating unit; The resonant capacitance voltage detection unit detects the resonant capacitance voltage signal and transforms this signal delivers to judging unit; Type under the signal of judgment unit judges resonant capacitance voltage detection unit conversion; Control and calculation unit calculates the optimum dead zone time according to the judgment unit judges signal type; Signal generating unit output phase-shifting full-bridge two brachium pontis that control and calculation unit calculated are managed the phase shift trigger impulse of the Dead Time of switch up and down.
2. the device of reduction phase-shifted full-bridge converter switching loss as claimed in claim 1 is characterized in that described resonant capacitance voltage detection unit comprises and two resonant capacitance (C of the following pipe of phase-shifting full-bridge two brachium pontis
3, C
4) first series resistance and second series resistance in parallel, two level shifting circuits and the memory cell of sampling; First series resistance comprises the first divider resistance (R of series connection
D1) and the second divider resistance (R
D2), second series resistance comprises the 3rd divider resistance (R of series connection
D3) and the 4th divider resistance (R
D4); First divider resistance (the R
D1) an end ground connection, the other end and the second divider resistance (R
D2) end connection; Described the 3rd divider resistance (R
D3) an end ground connection, the other end and the 4th divider resistance (R
D4) end connection.
3. the device of reduction phase-shifted full-bridge converter switching loss as claimed in claim 2 is characterized in that described level shifting circuit comprises two cascade discharge circuits: first order through transport discharge road and second level through transport discharge road; Wherein first order through transport discharge road comprises the first amplifier (A
1), the second amplifier (A
2), the first amplifier end of oppisite phase input resistance (R
1), the first amplifier positive terminal input resistance (R
2), the first feedback adjustable resistance (R
3), the first amplifier end of oppisite phase lands resistance (R
4), the second amplifier end of oppisite phase input resistance (R
5), the second amplifier positive terminal input resistance (R
6), the second feedback resistance (R
7) and the second amplifier end of oppisite phase land circuit (R
8); Through transport discharge road, the described second level comprises the 3rd amplifier, four high guaily unit, the 3rd amplifier end of oppisite phase input resistance (R
1'), the 3rd amplifier positive terminal input resistance (R
2'), the 3rd feedback adjustable resistance (R
3'), the 3rd amplifier end of oppisite phase lands circuit (R
4'), four high guaily unit end of oppisite phase input resistance (R
5'), four high guaily unit positive terminal input resistance (R
6'), the 4th feedback resistance (R
7') and four high guaily unit end of oppisite phase earth resistance (R
8').
4. the device of reduction phase-shifted full-bridge converter switching loss as claimed in claim 3 is characterized in that in the first order through transport discharge road the first amplifier end of oppisite phase input resistance (R
1) end, the first divider resistance (R
D1) end and the second divider resistance (R
D2) end connection, the first amplifier end of oppisite phase input resistance (R
1) other end, the first feedback adjustable resistance (R
3) end and the first amplifier (A
1) inverting input connect the first amplifier positive terminal input resistance (R
2) end, the first amplifier end of oppisite phase land resistance (R
4) end and the first amplifier (A
1) normal phase input end connect, the first amplifier end of oppisite phase lands resistance (R
4) other end ground connection, the first amplifier positive terminal input resistance (R
2) other end connection reference voltage (V
Ref1), the second amplifier end of oppisite phase input resistance (R
5) end, the first amplifier (A
1) the output and the first feedback adjustable resistance (R
3) other end connection, the second amplifier end of oppisite phase input resistance (R
5) other end, the second feedback resistance (R
7) end and the second amplifier (A
2) inverting input connect the second amplifier positive terminal input resistance (R
6) end, the second amplifier end of oppisite phase land circuit (R
8) end and the first amplifier (A
1) normal phase input end connect, the second amplifier end of oppisite phase lands circuit (R
8) other end ground connection, the second amplifier positive terminal input resistance (R
6) other end connects another reference voltage (V
Ref2), in the described second level through transport discharge road, the 3rd amplifier end of oppisite phase input resistance (R
1') end, the 3rd divider resistance (R
D3) end and the 4th divider resistance (R
D4) end connection, the 3rd amplifier end of oppisite phase input resistance (R
1') other end, the 3rd feedback adjustable resistance (R
3') end and the 3rd amplifier (A
3) inverting input connect the 3rd amplifier positive terminal input resistance (R
2') end, the 3rd amplifier end of oppisite phase land circuit (R
4') end and the 3rd amplifier (A
3) normal phase input end connect, the 3rd amplifier end of oppisite phase lands circuit (R
4') other end ground connection, the first amplifier positive terminal input resistance (R
2) other end connection reference voltage (V
Ref1'), four high guaily unit end of oppisite phase input resistance (R
5') end, the first amplifier (A
1) output and the 3rd feedback adjustable resistance (R
3') other end connection, four high guaily unit end of oppisite phase input resistance (R
5') other end, the 4th feedback resistance (R
7') end and the second amplifier (A
2) inverting input connect four high guaily unit positive terminal input resistance (R
6') other end connection reference voltage (V
Ref2'), the second feedback resistance (R
7) other end is connected the 4th feedback resistance (R with the output of second amplifier
7') other end is connected with the output of four high guaily unit; A receiving terminal of employing memory cell (/
1) and the second amplifier (A
2) output connect, another receiving terminal (/
2) be connected with the output of four high guaily unit.
5. utilize the described device of claim 1 to reduce the method for phase-shifted full-bridge converter switching loss, it is characterized in that comprising the steps:
(1) the resonant capacitance voltage detection unit is delivered to judging unit after detecting conversion resonant capacitance voltage signal;
(2) utilize in the phase-shifted full-bridge converter that judgment unit judges detects by detecting unit the two brachium pontis type of pipe resonant capacitance voltage signal down;
(3) control and calculation unit is according to the optimum dead zone time of two switching tubes about the same brachium pontis in real-time respectively calculating two brachium pontis of the type of judgment unit judges; Described Dead Time comprises the Dead Time between two switching tubes up and down of leading arm and lagging leg in the same brachium pontis of phase-shifting full-bridge, and the optimum dead zone time of two brachium pontis independently produces;
(4) Dead Time that produces through signal generating unit is that the phase shift trigger impulse of optimum dead zone time bears the voltage minimum when switching tube is opened, thereby reduces the switching loss of switching tube.
6. method according to claim 5 is characterized in that middle judgment unit judges two brachium pontis of step (2) size of pipe resonant capacitance voltage down, classifies then; Control and calculation unit to the classification of pipe resonant capacitance voltage swing down of two brachium pontis, calculates in two brachium pontis same brachium pontis optimum dead zone time of two switching tubes up and down according to judging unit in real time in the step (3).
7. method according to claim 5, it is characterized in that the dead band signal that the dead band signal generating unit produces in the step (4) is that a series of Dead Times are the pulse of optimum dead zone time, by this series of pulses being injected in the described phase-shift pulse generating unit, produce the phase-shift pulse signal of Adjustable real-time and Dead Time the best.
8. method according to claim 5 is characterized in that step (4) phase-shift pulse generating unit by Collaborative Control, and the control optimum dead zone time can be in harmonious proportion controls the trigger impulse phase shift.
9. method according to claim 5 is characterized in that step (1) sampling storage rule is, under the interior normal operating conditions of monocycle, have no progeny when leading arm switch pipe closes, begin sampling and timing, up to all open-minded with another switching tube of brachium pontis, duration Δ t, sampling number 50; The sampling of switch monocycle continues 1/6 power frequency period, promptly samples for totally 6 times in a power frequency period; A power frequency period storage data update all once.
10. method according to claim 5, it is characterized in that the dead band signal generating unit, adopt the TMS320F2812DSP of TI company, it is a series of pulses of switching frequency for optimum dead zone time, frequency that the dead band signal generating unit goes out size according to resonant capacitance voltage signal classified calculating.
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| CN2011100788478A CN102111074B (en) | 2011-03-30 | 2011-03-30 | Method and device for reducing switching loss of phase-shifting full-bridge converter |
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