CN103326587A - Light load control method and device of LLC (Liquid Level Control) resonant converter - Google Patents
Light load control method and device of LLC (Liquid Level Control) resonant converter Download PDFInfo
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Abstract
The invention provides a light load control method and device of an LLC (Liquid Level Control) resonant converter, belongs to the field of power conversion, and solves the problem that soft switching environments of a zero-voltage switch and a zero-current switch are lost. The method comprises the following steps of: A, judging whether the device works at a light load state or not; B, when the device does not work at the light load state, carrying out frequency adjusting control mode; C, when the device works at the light load state, carrying out fixed frequency pulse width control mode; and D, outputting a control signal of a corresponding switching tube. The device comprises a controller, a frequency modulation module and a width modulation module, a current detection unit and a voltage detection unit, wherein the controller is connected with a feedback compensating error amplifier; the voltage detection unit is connected with the feedback compensating error amplifier; the current detection unit is connected with the controller; the controller is connected with a working module switching unit; the frequency modulation module and the width modulation module are respectively connected with the controller and the working mode switching unit; and the working module switching unit is connected with the switching tube. The device and the method realize optimization of the soft switching environments and resonance parameters in a full-load range.
Description
Technical field
The invention belongs to the power conversion field, relate to a kind of LLC controlled resonant converter underload control method and device.
Background technology
Along with the development of switch power technology, high efficiency and high power density become development trend.Therefore the LLC controlled resonant converter is used and is given birth to also more and more extensive.The LLC controlled resonant converter realizes that in wider frequency range the no-voltage of primary side switching tube opens and secondary side rectifying tube zero-current switching.But along with alleviating of load, in order to obtain identical DC current gain, the LLC controlled resonant converter need to improve switching frequency.The rising of switching frequency has increased switching loss on the one hand; On the other hand, also will cause the electric current of rectification side diode just not turn-off when having back zero, the soft switch environment forfeiture of Zero Current Switch further increases switching loss.Simultaneously, underloading reduces quality factor of circuit Q value, and load variations can have a strong impact on voltage gain.Therefore, along with the increase of switching frequency, the efficient of transducer will be affected under the LLC controlled resonant converter underloading, compare its heavily loaded high efficiency, and the efficient when being difficult to take into account underloading simultaneously improves.
Along with the requirements at the higher level to supply convertor efficient, the LLC converter need to obtain higher light-load efficiency, prior art often adopts the output sluggishness with the control method of comparison circuit, on-off switching tube control signal when output voltage is elevated to a certain higher limit, and converter enters idle condition; Produce switching tube frequency modulation(FM) control signal when output voltage is reduced to a certain lower limit, converter enters the operating state of power output.The method is only suitable in utmost point underload or holding state.Other light load efficiency improves strategy also has increases switching tube or diode auxiliary branch in the primary and secondary level scheme, and the fixing PWM control program of duty ratio is also arranged.Loss when these schemes can make zero load or underload reduces, but realizes owing to increasing hardware in main circuit, and the reliability of circuit is brought certain impact, and the efficient when also being difficult to take into account heavy duty simultaneously improves.
It is 200910221471.4 a kind of LLC controlled resonant converter control method and device that Chinese patent literature discloses application number, this device is judged load condition by input switch pipe turn-on frequency, carry out respectively frequency conversion, transfer wide control according to load condition again, reduced to a certain extent circuit loss, but this frequency conversion transfers wide control without any constraints, can make the soft switch environment forfeiture of switch tube zero voltage switch and the rectifying tube Zero Current Switch of LLC controlled resonant converter, thereby make the cavity voltage gain uncertain.
Summary of the invention
The present invention is directed to existing technology and have the problems referred to above, a kind of LLC controlled resonant converter underload control method and device have been proposed, the method and device adopt surely frequency pulse width control of underload, thereby realize soft switch environment and the resonance parameter optimization of full-load range, the efficient of raising converter is light-load efficiency especially.
The present invention realizes by following technical proposal: a kind of LLC controlled resonant converter underload control method, it is characterized in that, the hardware circuit and the load control circuit that comprise the LLC controlled resonant converter, the concrete steps of described LLC controlled resonant converter underload control method are as follows:
Whether A, the output of judging controlled resonant converter according to output voltage signal and the output current signal of the conditioning of the hardware circuit of LLC controlled resonant converter work under the light-load state;
B, when the output of controlled resonant converter be not that load control circuit carries out the frequency adjustment control model when working in light-load state;
C, when the output of controlled resonant converter works in light-load state, load control circuit carries out deciding frequency pulse width control pattern;
D, output respective switch management and control signal processed are to the switching tube of LLC controlled resonant converter.
Whether the output voltage signal of the hardware circuit conditioning by the LLC controlled resonant converter and the output that output current signal is judged controlled resonant converter work under the light-load state, and wherein the operating state of the output of controlled resonant converter has three kinds of states such as heavy duty, nominal load and underload.When the output of controlled resonant converter worked in heavy duty, nominal load, load control circuit carried out the frequency adjustment control model.When the output of controlled resonant converter worked in light-load state, load control circuit carried out deciding frequency pulse width control pattern.This process implementation the zero voltage switch of switching tube and the Zero Current Switch software environment of rectifying tube in the full-load range.Thereby greatly reduced switching loss.
In above-mentioned LLC controlled resonant converter underload control method, output voltage signal calculates error voltage signal and output current signal judges whether the output of controlled resonant converter works under the light-load state through feedback compensation in the described steps A.Here calculating corresponding error voltage signal and output current signal by feedback compensation can be more accurately judge the operating state of the output of controlled resonant converter.
In above-mentioned LLC controlled resonant converter underload control method, among the described step C, in deciding the processing of frequency pulse width control pattern cycle, fixed switching frequency is resonance frequency, and according to different load output voltage voltage stabilizing requirements, calculates PWM duty ratio D.PWM is pulse-width regulated, and the frequency pulse width control pattern of deciding in this method is the pulse-width regulated control mode that is fixed frequency.Here determine that fixed switching frequency and load output voltage stabilizing requires the relation that exists with PWM duty ratio D, has the effect of optimizing the resonant network parameter.
In above-mentioned LLC controlled resonant converter underload control method, described PWM duty ratio is used for regulating the gain of controlled resonant converter interior resonance network voltage, and at this moment, underload resonant network voltage gain computing formula is
In above-mentioned LLC controlled resonant converter underload control method, the duty ratio D excursion of described adjusting underload resonant network voltage gain is
Wherein fr is resonance frequency, i.e. fixed switching frequency, f
R2It is the second resonance frequency.Proportion is regulated control model when nominal load, and this moment, switching frequency was at f
R2＜f≤f
rInterior change.Here the duty ratio D excursion of determining underload resonant network voltage gain is connected with nominal load with heavy duty and makes the fixed frequency value more stable.
In above-mentioned LLC controlled resonant converter underload control method, described controlled resonant converter interior resonance network works in the switching frequency f=f under the nominal load
r, switching frequency f=f
rBe frequency adjustment control model and the fixed frequently critical working point of pulse width control pattern.Here the switching frequency under the nominal load operating state is the fixed switching frequency under the underload operating state, and as frequency adjustment control model and the fixed frequently critical working point of pulse width control pattern.Be convenient to optimize the resonant parameter of controlled resonant converter interior resonance network.
In above-mentioned LLC controlled resonant converter underload control method, switching in the Dead Time after the switch periods end of described frequency adjustment control model and fixed frequently pulse width control pattern carried out.Here realized that the impact that is not subjected to a switch periods in Dead Time that frequency adjustment control model and fixed frequently pulse width control pattern are switched makes control more accurate.
A kind of LLC controlled resonant converter underload control device, it is characterized in that, this device comprises controller, be used for making controlled resonant converter be operated in the frequency modulation module under the frequency adjustment control model and be used for that controlled resonant converter is operated in deciding the wide module of accent under the frequency pulse width control pattern, for the output voltage signal of the hardware circuit conditioning that detects respectively the LLC controlled resonant converter and voltage detection unit and the current detecting unit of output current signal, described controller also is connected with the feedback compensation error amplifier, described voltage detection unit and reference voltage power supply connect respectively the input of feedback compensation error amplifier, described current detecting unit connects the input of controller, the output of described controller is connected with the operational module switch unit, described frequency modulation module be connected wide module to connect respectively controller and operational module switch unit, described operational module switch unit connects controlled resonant converter switch controlled end, and the output current signal that the error voltage signal that the output voltage that described controller detects according to voltage detection unit is exported behind the feedback compensation error amplifier and current detecting unit detect judges whether the LLC controlled resonant converter works in light-load state; If be not operated in underload, then select the work of frequency modulation module by the operational module switch unit, carry out the frequency adjustment control model; If be operated in underload, then select to transfer wide module work by the operational module switch unit, carry out deciding frequency pulse width control pattern, realize the duty cycle adjustment voltage gain, and export corresponding switch controlled signal to the switch controlled end through the operational module switch unit.
LLC controlled resonant converter hardware circuit bussed supply voltage is direct voltage.Load control circuit comprises controller, voltage detection unit, current detecting unit, frequency modulation module and transfer wide module.Voltage detection unit gathers the direct current output loading voltage signal of LLC controlled resonant converter hardware circuit, send to the feedback compensation error amplifier, and compare with reference voltage, the error voltage signal after relatively sends to controller through the feedback compensation error amplifier.The output current signal of simultaneously received current detecting unit collection of controller, controller judges that according to the error voltage signal that receives and output current signal load is nominal load, heavy duty or underload, selects corresponding control model through the operational module switch unit; If be operated in heavy duty or nominal load, then select the work of frequency modulation module by the operational module switch unit, carry out the frequency adjustment control model; If be operated in underload, then select to transfer wide module work by the operational module switch unit, carry out deciding frequency pulse width control pattern, realize the duty cycle adjustment voltage gain, and export corresponding switch controlled signal to the switch controlled end through the operational module switch unit.
In above-mentioned LLC controlled resonant converter underload control device, the wide module of described accent is fixed for generation of frequency and is decided frequency pulse width signal, the symmetrical output form of the up and down arm switch pipe of described controlled resonant converter according to what the controlled resonant converter output voltage signal was regulated change in duty cycle.Here realized under the underload situation, the control signal that controlled resonant converter receives is the two-way pwm signal that same frequency, same duty cycle and sequential differ half switch periods.
In above-mentioned LLC controlled resonant converter underload control device, described LLC resonant transformation is that the interior resonance network is low magnetizing inductance.Low magnetizing inductance higher circulating current in the time of can causing transformer primary side underloading on the one hand is on the other hand again so that when the heavy duty resonance current is larger, bring more conducting and switching loss.Low magnetizing inductance can obtain switching frequency narrower under the identical gain, has certain effect to optimizing transformer size and control circuit tool.
Compared with prior art, this LLC controlled resonant converter underload control method and device have the following advantages:
1, this device and method adopts surely frequency pulse width control of underload, realizes soft switch environment and the resonance Parameters Optimal Design of full-load range, and the efficient of raising controlled resonant converter is light-load efficiency especially.
2, this device and method directly carries out the selection of mode of operation by voltage, the current condition of load.Simultaneously, the present invention has also explicitly pointed out the critical switching point of two kinds of mode of operations at nominal load resonance frequency place.Guarantee switch tube zero voltage switch in the whole control procedure and the soft switch environment of rectifying tube Zero Current Switch, thereby effectively determine the cavity voltage gain.
Description of drawings
Fig. 1 is circuit diagram of the present invention;
Fig. 2 is control flow chart of the present invention;
The crucial current waveform figure of the switch controlled signal resonant cavity that Fig. 3 transfers wide module to produce when being underload regulation and control of the present invention.T wherein
r=1/f
r, a=DT
r
Fig. 4 is the present invention's resonant cavity normalized gain performance diagram when deciding frequency pulse width control pattern;
Fig. 5 is the present invention crucial electric current experimental waveform of resonant cavity figure when deciding frequency pulse width control pattern.
Embodiment
Below be specific embodiments of the invention, and by reference to the accompanying drawings technical scheme of the present invention be further described, but the present invention is not limited to these embodiment.
Shown in Fig. 1-5, this LLC controlled resonant converter underload control method comprises hardware circuit and the load control circuit of LLC controlled resonant converter, and the concrete steps of LLC controlled resonant converter underload control method are as follows:
Whether A, the output of judging controlled resonant converter according to output voltage signal and the output current signal of the conditioning of the hardware circuit of LLC controlled resonant converter work under the light-load state; Output voltage signal calculates error voltage signal through feedback compensation and output current signal judges whether the output of controlled resonant converter works under the light-load state.
B, when the output of controlled resonant converter be not that load control circuit carries out the frequency adjustment control model when working in light-load state;
C, when the output of controlled resonant converter works in light-load state, load control circuit carries out deciding frequency pulse width control pattern.In deciding the processing of frequency pulse width control pattern cycle, fixed switching frequency is resonance frequency, and according to different load output voltage voltage stabilizing requirements, calculates PWM duty ratio D.
D, output respective switch management and control signal processed are to the switching tube of LLC controlled resonant converter.
The PWM duty ratio is used for regulating the gain of controlled resonant converter interior resonance network voltage, and at this moment, underload resonant network voltage gain computing formula is
The duty ratio D excursion of regulating underload resonant network voltage gain is
f
rBe resonance frequency, i.e. fixed switching frequency, f
R2Be the switch low-limit frequency under the frequency adjustment control model, i.e. the second resonance frequency.Controlled resonant converter interior resonance network works in the switching frequency f=f under the nominal load
r, switching frequency f=f
rBe frequency adjustment control model and the fixed frequently critical working point of pulse width control pattern.Here the switching frequency under the nominal load operating state is the fixed switching frequency under the underload operating state, and as frequency adjustment control model and the fixed frequently critical working point of pulse width control pattern.Be convenient to optimize the resonant parameter of controlled resonant converter interior resonance network.Switching in the Dead Time after the switch periods end of frequency adjustment control model and fixed frequently pulse width control pattern carried out.
This LLC controlled resonant converter underload control device comprises controller, be used for making controlled resonant converter be operated in the frequency modulation module under the frequency adjustment control model and be used for that controlled resonant converter is operated in deciding the wide module of accent under the frequency pulse width control pattern, for the output voltage signal of the hardware circuit conditioning that detects respectively the LLC controlled resonant converter and voltage detection unit and the current detecting unit of output current signal, described controller also is connected with the feedback compensation error amplifier, described voltage detection unit and reference voltage power supply connect respectively the input of feedback compensation error amplifier, described current detecting unit connects the input of controller, the output of described controller is connected with the operational module switch unit, described frequency modulation module be connected wide module to connect respectively controller and operational module switch unit, described operational module switch unit connects controlled resonant converter switch controlled end, and the output current signal that the error voltage signal that the output voltage that described controller detects according to voltage detection unit is exported behind the feedback compensation error amplifier and current detecting unit detect judges whether the LLC controlled resonant converter works in light-load state; If be not operated in underload, then select the work of frequency modulation module by the operational module switch unit, carry out the frequency adjustment control model; If be operated in underload, then select to transfer wide module work by the operational module switch unit, carry out deciding frequency pulse width control pattern, realize the duty cycle adjustment voltage gain, and export corresponding switch controlled signal to the switch controlled end through the operational module switch unit.
Transfer wide module to fix for generation of frequency and decide frequency pulse width signal, the symmetrical output form of the up and down arm switch pipe of described controlled resonant converter according to what the controlled resonant converter output voltage signal was regulated change in duty cycle.
LLC controlled resonant converter underload control method of the present invention and device are applicable to the resonance type power converter of full-bridge, half-bridge or push-pull configuration.Controlled resonant converter generally comprises electronic switch, the output of half-bridge or full bridge structure, armature winding or electromagnetic induction coil series connection by resonant inductance, resonant capacitance and transformer consist of, and wherein resonant inductance can be integrated with transformer magnetic, perhaps individualism.The LLC controlled resonant converter of selecting in the present embodiment be LLC half bridge resonant as shown in Figure 1, comprising: input direct voltage V
In, by the squarer of switching tube Q1, switching tube Q2 driving, by the series resonance capacitor C
r, series resonance inductor L
rWith the shunt excitation inductance L
mThe resonant network that forms, no-load voltage ratio is the ideal transformer T of n:1:1, diode VD
1, diode VD
2The rectification circuit that forms, filter capacitor C
OAnd load resistance R
OSeries resonance inductor L wherein
rCan be an independent component, also can be integrated with transformer T magnetic.Drawn switching tube Q among the figure
1, switching tube Q
2Control signal control and Working mould block selection signal mode at the timing waveform of critical point.Above-mentioned voltage detection unit, current detecting unit can be made of resistance, also can be made of Hall element or voltage, current transformer; Its middle controller, frequency modulation module, the wide module of accent and Working mould block selection circuit can adopt analog circuit to realize, also can adopt digital circuit to realize, comprise the programmable controller with software operational capability.
As shown in Figure 1, 2, FM represents the frequency adjustment control model among the figure, and PWM represents solid frequency pulse-width regulated control model, and LLC controlled resonant converter hardware circuit bussed supply voltage is direct voltage.Load control circuit comprises controller, voltage detection unit, current detecting unit, frequency modulation module and transfer wide module.Voltage detection unit gathers the direct current output loading voltage signal of LLC controlled resonant converter hardware circuit, send to the feedback compensation error amplifier, and compare with reference voltage, the error voltage signal after relatively sends to controller through the feedback compensation error amplifier.The output current signal of simultaneously received current detecting unit collection of controller, controller judges that according to the error voltage signal that receives and output current signal load is nominal load, loyal load or underload, selects corresponding control model through the operational module switch unit; If be operated in heavy duty or nominal load, then select the work of frequency modulation module by the operational module switch unit, carry out the frequency adjustment control model; If be operated in underload, then select to transfer wide module work by the operational module switch unit, carry out deciding frequency pulse width control pattern, realize the duty cycle adjustment voltage gain, and export corresponding switch controlled signal to the switch controlled end through the operational module switch unit.If select solid frequently pulse width control pattern, controller is in the period treatment of transferring wide module, and fixed switching frequency is resonance frequency, and according to the voltage gain formula calculating PWM duty ratio of different load output voltages by solid frequency pulse width control pattern; Controller is in the period treatment of frequency modulation module, and fixed duty cycle is that 1/2(ignores Dead Time), switching frequency calculates according to the voltage gain formula of different load output voltages by the FM pattern; Controller selects to transfer wide module or the work of frequency modulation module, output switch management and control signal processed according to loading condition.Controller is exchanged wide module and is carried out the duty ratio adjustment according to different error voltage values, thereby the voltage gain of regulating circuit makes the output loading voltage of LLC controlled resonant converter keep stable.Concrete adjustment process comprises:
Proportion is regulated the frequency adjustment control model of gain when nominal load, and switching frequency is at f
R2＜f≤f
rInterior change represents Q on the signal flow graph in the drawings
1, Q
2Be Fig. 1 switching tube Q1 and driving signal corresponding to switching tube Q2.The driving signal Q of switching tube
1, Q
2Duty ratio is fixed as 1/2.The resonant network voltage gain is:
Wherein
Quality factor
C in the formula
rBe the series resonance capacitor C
rCapacitance, L
rInductance value, L for series resonance inductor Lr
mBe magnetizing inductance L
mInductance value, K is the ratio of magnetizing inductance and resonant inductance.
When load lightens, adopt switching frequency to be fixed as f=f
rSolid frequency pulse width control pattern, come regulation voltage gain by PWM duty ratio D.Resonant network circuit gain computing formula is
Wherein duty ratio D excursion is
When duty ratio is the pwm signal of D when removing to control LLC controlled resonant converter half-bridge switch pipe, by fourier decomposition, bussed supply direct voltage V
InThe fundametal compoment amplitude that is input to resonant network is:
And the fundametal compoment amplitude under traditional frequency adjustment control model is
Per half switch periods is T, and load current Io is by resonance current i
CrWith exciting current i
LmDifference obtain through transformer coupled, satisfy:
I
oWith i
CrAnd i
LmThe area that surrounds is directly proportional.During power output, exciting current i
LmBecause rectification side clamped kept constant linear change.Therefore, when load reduction, resonance current i
CrMust reduce to adapt to this variation.Because switching frequency is fixed on f=f
r, do not change the impedance operator of resonant network, can adapt to resonance current i by PWM duty ratio D control inputs voltage
CrReduce.
Can demonstrate fully the result that the present invention obtains according to above-mentioned analysis in Fig. 3,4,5, the operational modal analysis of carrying out solid frequency pulse-width regulated control model such as Fig. 3 under light-load state is as follows:
In Fig. 3, can see, at t
0Constantly, drive signal Q
2Turn-off exciting current i
LmOppositely, beginning is linear rises resonance current i
CrBy resonance frequency f
rRise resonance current i
CrExciting current i
Lm, rectification side diode VD
1Conducting, output has obtained energy.Because the existence of duty ratio, at this moment Q
1Driving signal does not arrive;
At resonance current i
CrT before the zero passage
1Constantly, apply Q
1Drive signal; Because underload makes resonance current i
CrLow during than nominal load, resonance current i
Cr=exciting current i
LmOccur in the t that arrived before the half period
2Constantly, rectification this moment side diode VD
1Cut-off, energy is cut off from the input stage to the output stage.Resonance current i
CrWith exciting current i
LmSerial connection, resonant network is pressed f
R2Frequency resonance.See diode VD
1For Zero Current Switch turn-offs;
At t
3Constantly, Q
1The driving signal turn-offs, exciting current i
LmOppositely, beginning is linear descends resonance current i
CrBy resonance frequency f
rDescend resonance current i
Cr＜exciting current i
Lm, rectification side diode VD
2The conducting rectification;
At i
CrT before the zero passage
4Constantly, apply Q
2Drive signal; Resonance current i
Cr=exciting current i
LmOccur in the t that arrived before the half period
5Constantly, rectification this moment side diode VD
2Cut-off, energy is cut off from the input stage to the output stage.Resonance current i
CrWith exciting current i
LmSerial connection, resonant network is pressed f
R2Frequency resonance.Diode VD
2For Zero Current Switch turn-offs;
At t
6Constantly, Q
2The driving signal turn-offs, i
LmOppositely, enter next work period.
To sum up can find out under light-load state the analysis of Fig. 3 and realize that with solid frequently pulse-width regulated control model the Zero Current Switch of rectification side diode turn-offs, if driving signal can guarantee to apply before the resonance current zero passage, then the switch tube zero voltage switch turn-offs and also can realize, Gu frequently pulse-width regulated control mould realizes that the zero voltage switch shutoff is guaranteed by duty ratio D span.
Resonant network is designed to work under the nominal load switching frequency f=f
r, this also is the critical working point that frequency modulation mode and fixed pulse width are regulated pattern.Frequency modulation mode and the solid frequently switching of pulse-width regulated control model are to carry out in the Dead Time after a switch periods finishes.Fixed pulse width adjusting pattern has the upper underarm symmetrical drive form same with frequency modulation mode.
The selection of operational module and the calculating of error voltage signal can be adopted analog circuit or digital control PI algorithm.
Fig. 4 is resonant cavity normalized gain performance diagram when using solid frequently pulse-width regulated control model among the utility model embodiment.The selected parameter of curve is: L
r=46 μ H, Lm=1.38mH, C
r=55nF, Q=0.126, K=30.X-axis is duty ratio D, and Y-axis is the normalized voltage gain, switching frequency f=f among the figure
r, by duty ratio minimum value D
MinDetermine the minimum voltage gain G
MinD
MinCan when design resonant network parameter, determine.As can be seen from the figure can effectively determine the cavity voltage gain by this gain computing formula.Conventional frequency modulation mode can make quality factor of circuit change when load variations, cause circuit gain to change along with load, use underload gain characteristic curve as shown in Figure 4, can effectively improve above-mentioned impact, make circuit gain and load switch, controlled by duty ratio D.
Fig. 5 uses the crucial electric current experimental waveform of solid frequently pulse-width regulated control model resonant cavity figure in the present embodiment.As scheme to have shown driving signal Q
1Be 5V/div, Q
2Be the lower i of 5V/div effect
CrVoltage and rectifier diode VD for resonance current 500mA/div, switching tube Q1, switching tube Q2
1, diode VD
2Current waveform figure, Fig. 5 has further verified the analysis of above-mentioned Fig. 3.Wherein X-axis is i
Cr=0.Experimental results show that such as figure underload adopts PWM duty ratio D control voltage gain, make the LLC controlled resonant converter realize that the zero voltage switch of switching tube is turn-offed and the Zero Current Switch of rectifying tube turn-offs, represent that with ZVS zero voltage switch is turn-offed and the ZCS table is that Zero Current Switch turn-offs respectively in the drawings.Drive signal Q as having shown among Fig. 5 in solid frequency pulse-width regulated control model
1, Q
2The lower resonance current i of effect
Cr, rectifying tube VD
1, VD
2Current waveform.Gu the pulse-width regulated control model makes converter realize ZCS when underloading frequently, as shown in Figure 5, Q
1Drive signal and turn-off front certain moment, i
VD2Arrive 0 and realize zero-current switching, after this Q
1The driving signal turn-offs, resonance current i
CrBeginning oppositely descends i behind the phase delay voltage
VD1Rise, at i
CrBefore the zero passage, Q
2The driving signal arrives.Therefore, this pattern had both realized switching tube ZVS, had realized again rectifying tube ZCS.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (10)
1. a LLC controlled resonant converter underload control method is characterized in that, comprises hardware circuit and the load control circuit of LLC controlled resonant converter, and the concrete steps of described LLC controlled resonant converter underload control method are as follows:
Whether A, the output of judging controlled resonant converter according to output voltage signal and the output current signal of the conditioning of the hardware circuit of LLC controlled resonant converter work under the light-load state;
B, when the output of controlled resonant converter be not that load control circuit carries out the frequency adjustment control model when working in light-load state;
C, when the output of controlled resonant converter works in light-load state, load control circuit carries out deciding frequency pulse width control pattern;
D, output respective switch management and control signal processed are to the switching tube of LLC controlled resonant converter.
2. LLC controlled resonant converter underload control method according to claim 1, it is characterized in that, in the described steps A, output voltage signal calculates error voltage signal through feedback compensation and output current signal judges whether the output of controlled resonant converter works under the light-load state.
3. LLC controlled resonant converter underload control method according to claim 1 and 2 is characterized in that, among the described step C, in deciding the processing of frequency pulse width control pattern cycle, fixed switching frequency is resonance frequency, and according to different load output voltage voltage stabilizing requirements, calculates PWM duty ratio D.
4. LLC controlled resonant converter underload control method according to claim 3 is characterized in that, described PWM duty ratio D is used for regulating the gain of controlled resonant converter interior resonance network voltage, and underload resonant network voltage gain computing formula is
5. LLC controlled resonant converter underload control method according to claim 4 is characterized in that, the duty ratio D excursion of described adjusting underload resonant network voltage gain is
F wherein
rBe resonance frequency, i.e. fixed switching frequency, f
R2It is the second resonance frequency.
6. LLC controlled resonant converter underload control method according to claim 5 is characterized in that, described controlled resonant converter interior resonance network works in the switching frequency f=f under the nominal load
r, switching frequency f=f
rBe frequency adjustment control model and the fixed frequently critical working point of pulse width control pattern.
7. LLC controlled resonant converter underload control method according to claim 6 is characterized in that, switching in the Dead Time after the switch periods end of described frequency adjustment control model and fixed frequently pulse width control pattern carried out.
8. LLC controlled resonant converter underload control device, it is characterized in that, this device comprises controller, be used for making controlled resonant converter be operated in the frequency modulation module under the frequency adjustment control model and be used for that controlled resonant converter is operated in deciding the wide module of accent under the frequency pulse width control pattern, be used for detecting respectively voltage detection unit and the current detecting unit of LLC controlled resonant converter output voltage signal and output current signal, described controller also is connected with the feedback compensation error amplifier, described voltage detection unit and reference voltage power supply connect respectively the input of feedback compensation error amplifier, described current detecting unit connects the input of controller, the output of described controller is connected with the operational module switch unit, described frequency modulation module be connected wide module to connect respectively controller and operational module switch unit, described operational module switch unit connects controlled resonant converter switch controlled end.
9. LLC controlled resonant converter underload control device according to claim 8, it is characterized in that, the wide module of described accent is fixed for generation of frequency and is decided frequency pulse width signal, the symmetrical output form of the up and down arm switch pipe of described controlled resonant converter according to what the controlled resonant converter output voltage signal was regulated change in duty cycle.
10. LLC controlled resonant converter underload control device according to claim 9 is characterized in that, described resonant network parameter is large magnetizing inductance value and little resonant inductance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310301554.0A CN103326587B (en) | 2013-07-17 | 2013-07-17 | LLC resonant converter underload control method and device |
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| CN103683940A (en) * | 2013-12-13 | 2014-03-26 | 华为技术有限公司 | DC-DC converting circuit, device and working method |
| CN104518693A (en) * | 2013-09-30 | 2015-04-15 | 三垦电气株式会社 | Current resonance type power supply device |
| CN104540310A (en) * | 2015-01-15 | 2015-04-22 | 苏州市纽克斯照明有限公司 | Output resonant converter of ballast for plant light-compensating light and control method thereof |
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| CN107196512A (en) * | 2017-06-21 | 2017-09-22 | 国电南瑞科技股份有限公司 | The wide range output control method of LLC resonant transform circuits |
| CN108667299A (en) * | 2017-03-31 | 2018-10-16 | 沃尔缇夫能源系统公司 | A kind of method and relevant apparatus improving LLC resonant converter reliability |
| CN109156058A (en) * | 2016-04-14 | 2019-01-04 | 飞利浦照明控股有限公司 | Half bridge resonant converter, the circuit using them and corresponding control method |
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| US11038430B2 (en) | 2019-08-02 | 2021-06-15 | Analog Devices International Unlimited Company | LLCC secondary overtone resonant power converter |
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