CN101064476B - Resonant DC/DC converter and its control method - Google Patents
Resonant DC/DC converter and its control method Download PDFInfo
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Abstract
The invention discloses a resonance direct current/ direct current converter and control method, it adjusts output voltage by changing conducting frequency of input switch of the resonance circuit, adjusts the shift angle of said switch according to feedback signal of load circuit to extend the output range of voltage of the resonance circuit. The invention also provides structure of the resonance direct current/ direct current converter with said method. The advantages of the invention are following: adopting frequency modulation and frequency modulation+ shift phase control mode to control the resonance direct current/ direct current converter, using frequency modulation when operating frequency of power source is low, using frequency modulation+ shift phase when operating frequency of power source is too high, the problem of resonance converter is resolved, that is problem of high operating frequency and big spoilage, and the output voltage adjustment capability of resonance circuit increased greatly, the output voltage range is extended efficiently.
Description
[technical field]
The present invention relates to the DC power supply converter technique, specifically relate to a kind of resonance DC/DC converter and control method thereof.
[background technology]
Miniaturization and high frequencyization are current power supply Development Trend, but the rising of switching frequency has brought the excessive problem of switching tube loss, and this is that traditional B UCK converter is insurmountable, and controlled resonant converter then can address this problem preferably.
With the series resonant converter is example, series-resonant direct-current/direct-current (DC/DC) converter using resonant transformation technology, because resonant element is operated in the sinusoidal resonance state, the voltage natural zero-crossing on the switching tube can realize that no-voltage is open-minded, and the loss of power is very little.This topology adopts Frequency-variable Modulation (Pulse frequency modulation is called for short PFM) mode usually, comes regulated output voltage through changing operating frequency.Fig. 1 is the citation form of full-bridge SRC series-resonant direct-current/direct-current converter; When this circuit is adopted PFM control; Two groups of switching tube S1, S4 and S2, the complementary symmetries of S3 drive, the switch periods of each conducting 50% (this is an ideal value, should be like the setting of considering the dead band and is slightly less than 50%).The relation of electric power output voltage gain M and operating frequency f is:
Wherein, V
oWith V
InBe respectively output, input voltage, f is an operating frequency,
f
rBe resonance frequency, L
rBe resonant inductance value, C
rBe resonant capacitance value, P
oBe power output.
From formula (1), can find, when operating frequency f greater than resonance frequency f
rThe time, operating frequency is high more, and voltage gain M is low more; In like manner, when operating frequency f less than resonance frequency f
rThe time, operating frequency is low more, and voltage gain M is low more.Series resonance topology control frequency f and output voltage V
oRelation curve as shown in Figure 2.Can find that by Fig. 2 main difficult point problem of series resonant converter is that output voltage is difficult to stablize under underloading and the idle condition.When control frequency greater than resonance frequency fr, the output voltage of series resonance topology reduces along with the rising of control frequency, when load is decreased to light condition; Output voltage tends towards stability; For burning voltage, operating frequency need rise very highly like this, but the wide meeting of operating frequency range brings magnetic device to be difficult to optimum problem; And operating frequency is high more, and circuit loss is also big more; In addition, approaching unloaded when load, output voltage might rise on the contrary, causes carrying out negative feedback control.Therefore in the power supply industry, there is the people to add fixing load, utilizes this method regulated output voltage under underloading and idle condition, but can increase no-load loss like this, reduce power-efficient at output.
In a word, simple VFC can cause operating frequency range wide even lost efficacy, and brings magnetic element to be difficult to optimum problem, and the FEEDBACK CONTROL problem that is difficult to design, so simple frequency modulation control can't satisfy underloading or the requirement of output voltage stabilizing when unloaded.
Be that example has been explained the defective that the frequency modulation control mode exists with the full-bridge series resonance circuit above, same, theoretically, all there is similar problem in the resonant circuit of all frequency modulation control.
[summary of the invention]
The object of the present invention is to provide a kind of control method and device thereof of resonance DC/DC converter, adopt frequency modulation control to have the problem that is difficult to voltage stabilizing in underloading or when unloaded to solve in the prior art loaded work piece.
To achieve these goals; The technical scheme that the present invention taked is: a kind of control method of resonance DC/DC converter; Be to regulate output voltage through the turn-on frequency that changes its resonant circuit input switch pipe; Also the feedback signal according to load circuit makes converter get into phase-shift control mode, adjusts the phase shifting angle of said switching tube, makes the voltage output range of resonant circuit expand.
Said resonant circuit input switch pipe can be controlled through drive circuit by driving pulse, and the acquisition of said driving pulse comprises the steps,
1) obtains the feedback signal of load circuit;
2) judge according to said feedback signal whether load is operated in underloading or Light Condition;
3) the common pulse signal of regulating makes resonant circuit be operated in phase shifting control and controls mixed mode with PFM as the driving pulse of drive circuit if loaded work piece at underloading or Light Condition, then changes frequency and phase shifting angle with feedback signal; Otherwise the pulse signal that the stable and frequency of phase shifting angle is changed with feedback signal makes resonant circuit be operated in the PFM control model as the driving pulse of drive circuit.
Said step 1) can comprise the steps:
1a) sampling feedback voltage from load circuit;
1b) said feedback voltage is carried out the negative feedback compensation operation and obtain feedback signal.
PFM control is preferably realized by following process with the selection of PFM+ phase shifting control in the above-mentioned control method: said step 2) feedback signal is obtained frequency change control signal and phase-shifted control signal respectively after calculation process; The calculation process process that obtains said phase-shifted control signal comprises the feedback signal after the computing and first reference voltage are compared to judge whether load is operated in the step of underloading or Light Condition, and said first reference voltage is confirmed according to the electrical characteristic of said load; When loaded work piece during, promptly produce in the said step 3) by frequency change control signal and the common driving pulse of regulating of phase-shifted control signal at underloading or Light Condition; Otherwise, produce the stable and driving pulse that regulate separately by frequency change control signal of phase shifting angle.
Also can further increase the selection of independent employing phase shifting control in the above-mentioned control method: the calculation process process that obtains said frequency change control signal said step 2) comprises the feedback signal after the computing and second reference voltage compared judges whether load is operated in the step of approximate Light Condition; Said second reference voltage is confirmed according to the electrical characteristic of said load; And said second reference voltage satisfies, if load then must be operated in underloading or Light Condition according to the judgement of first reference voltage according to the judgment task of second reference voltage at approximate Light Condition; When loaded work piece during, promptly produce frequency stabilization and the driving pulse regulated separately by phase-shifted control signal in the said step 3) at approximate Light Condition.
Be the object of the invention, a kind of resonance DC/DC converter also is provided, comprise
Drive circuit resonant circuit, said drive circuit is according to the input switch pipe of the driving pulse control resonant circuit of input, and resonant circuit offers load circuit with the power supply after the conversion under the control of said drive circuit, and
Negative feedback compensated regulator, the feedback voltage that will from load circuit, sample carry out obtaining feedback signal behind the negative feedback compensation operation;
Discriminator is according to the load condition of the feedback signal judgement load circuit of importing, output driving pulse modulation signal;
Drive-pulse generator, according to the driving pulse modulation signal modulation and the output driving pulse of input: if loaded work piece at underloading or Light Condition, the frequency of the driving pulse of output and phase shifting angle change with feedback signal and common adjusting; Otherwise the stable and frequency of the phase shifting angle of the driving pulse of output changes with the variation of feedback signal.
A kind of possibility that above-mentioned resonance DC/DC converter carries out PFM control and PFM+ phase shifting control is to adopt two relatively independent drive signal generation circuit modules; That is, said drive-pulse generator comprises frequency conversion control circuit and VFC+phase-shift control circuit; If said discriminator is judged loaded work piece at underloading or Light Condition, then, control its output frequency and phase shifting angle and change and the common driving pulse of regulating with feedback signal to VFC+phase-shift control circuit output driving pulse modulation signal; Otherwise,, control the driving pulse that the stable and frequency of its output phase shifting angle changes with the variation of feedback signal then to frequency conversion control circuit output driving pulse modulation signal.
A kind of preferred version that above-mentioned resonance DC/DC converter carries out PFM control and PFM+ phase shifting control then can only adopt a drive signal generation circuit module: said discriminator comprises first computing circuit and second computing circuit; Said first computing circuit is set with first reference voltage, and said driving pulse modulation signal comprises frequency change control signal and phase-shifted control signal; Said feedback signal through first computing circuit carry out computing, with first reference voltage relatively after, be output as phase-shifted control signal; Said feedback signal carries out being output as frequency change control signal after the computing through second computing circuit; Said first reference voltage confirms according to the electrical characteristic of load, makes that the phase-shifted control signal of output changes with the variation of feedback signal when loaded work piece during at underloading or Light Condition; Otherwise, then keep stable; Said drive-pulse generator comprises frequency conversion control circuit and phase-shift control circuit; Said frequency conversion control circuit produces the variable-frequency pulse of frequency by frequency change control signal control, and said phase-shift control circuit carries out said variable-frequency pulse to export driving pulse after the phase shifting control according to phase-shifted control signal.
Said phase-shift control circuit can be with phase-shifted control signal and the relatively more synthetic back output of variable-frequency pulse driving pulse.
For realizing the pure phase shifting control control under the approximate Light Condition, further preferably, said second computing circuit is set with second reference voltage; Said feedback signal through second computing circuit carry out computing, with second reference voltage relatively after, be output as frequency change control signal; Said second reference voltage confirms according to the electrical characteristic of load, makes that the frequency change control signal of output keeps stablizing when loaded work piece during at approximate Light Condition; Otherwise then the variation with feedback signal changes; And said second reference voltage satisfies, if load then must be operated in underloading or Light Condition according to the judgement of first reference voltage according to the judgment task of second reference voltage at approximate Light Condition;
Said frequency conversion control circuit can adopt such structure, comprises the voltage-frequency oscillator and the triangular-wave generator that connect successively; Said its frequency of oscillation of frequency change control signal input voltage-frequency oscillator control, the controlled variable-frequency pulse of said triangular-wave generator output frequency.
Adopt technique scheme, beneficial technical effects of the present invention is:
1) in the control mode of resonance DC/DC converter, introduce phase-shift control mode, realize PFM and two kinds of control modes of PFM+ phase shifting control, when the power work frequency is low, adopt PFM control, introduce the PFM+ phase-shift control mode when power work frequency is too high.Also can be when frequency be higher fixed frequency; Get into phase-shift control mode, thereby solved the difficult point problem of controlled resonant converter, promptly unloaded and problem that underloading is difficult to voltage stabilizing; Greatly increase the output voltage regulating power of resonant circuit, effectively expanded voltage output range.
Traditional phase whole-bridging circuit is the outstanding DC-DC variator of a kind of ten minutes, utilizes the resonant inductance energy to realize the ZVT of switching tube equally, has reduced the switching loss of switching tube.It has, and circuit is simple with control, switching tube is realized advantages such as soft switch, circuit efficiency is high, EMI is little easily; Be described as one of best DC to DC converter; And phase shifting control is under the situation of underloading and zero load; Input voltage and load are fixed, and phase shifting angle and output voltage have monotonic relationshi preferably.Though this kind circuit is in order to realize soft switch; Need bigger output differential mode inductance to realize the soft switch of leading-bridge, and can not be excessive for the volume that guarantees resonant inductance, can only on a fixed load (like 50% load), could realize the soft switch of lagging leg; On off state before is hard switching; Cause soft switch condition harsh, efficient and thermal design are in hard switching attitude difficulty, still because the present invention also keeps the part characteristic of resonance DC/DC converter; Therefore its soft switch condition is still relatively easy, and can not bring difficulty owing to the introducing of phase-shift circuit.
2) PFM control logically is optional parallelly connected relation with PFM+ phase shifting control dual mode; But can adopt the mode of preferred frequency conversion control circuit and phase-shift control circuit series connection to realize; The preferred circuit of realizing has been avoided the use of many logic gating devices and multichannel negative feedback compensated regulator; Circuit is simple, and two kinds of control modes switchings are level and smooth, and its reliability and dynamic characteristic are very good.
The present invention is suitable for the distortion topology of resonant circuits such as full-bridge series and parallel resonant circuit and LLC, and stronger engineering significance is arranged.
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description:
[description of drawings]
Fig. 1 is a kind of existing typical full-bridge series resonance circuit diagram
Fig. 2 is the output characteristic curve figure under the circuit PFM control mode among Fig. 1.
Fig. 3 is that the output characteristic curve after the circuit employing control method of the present invention compares sketch map among Fig. 1.
Fig. 4 is a kind of theory diagram of DC to DC converter of the present invention.
Fig. 5 A is the refinement block diagram of circuit in Fig. 4 frame of broken lines.
Fig. 5 B is the physical circuit instance graph of pi regulator among Fig. 5 A, first computing circuit and second computing circuit.
Fig. 5 C is that phase shifting angle produces circuit diagram.
Fig. 6 be among Fig. 4 DC to DC converter feedback signal and frequency and phase shifting angle concern sketch map.
Fig. 7 is drive pulse waveform figure.
Fig. 8 is the theory diagram of another kind of DC to DC converter of the present invention.
[embodiment]
A kind of control method of resonance DC/DC converter; Be to regulate output voltage through the turn-on frequency that changes its resonant circuit input switch pipe; Also adjust the phase shifting angle of said switching tube, make the voltage output range of resonant circuit expand according to the feedback signal (obtaining) of load circuit from the output voltage or the output current sampling of controlled resonant converter.
Be example still with the full-bridge series resonance circuit among Fig. 1; Curve A 1～A3 among Fig. 3 adopts independent PFM control mode under the different loads situation; Phase shifting angle is the output voltage V o of 0 degree and the characteristic curve sketch map of frequency f, can find out, along with alleviating of load; Vo tends towards stability, and is difficult to stablize through the mode that improves operating frequency.Curve B 1 among Fig. 3, B2, B3 be respectively the switching frequency of curve A 1～A3 when being elevated to fa in the PFM control mode characteristic curve sketch map of output voltage V o and phase shifting angle α and frequency f under the comprehensive system mode after the incision phase shifting control; Control to phase shifting angle α is spent till 180 degree since 0.Can find out that by curve B 1, B2, B3 after having introduced the PFM+ phase shifting control, output voltage can begin greater than fa at control frequency, to control frequency fb rapidly to 0, compare output characteristic with simple PFM control mode and obtained very big improvement.
Control to resonant circuit input switch pipe is carried out through drive circuit by driving pulse; Therefore the switching from PFM to the PFM+ phase shifting control leans on the variation of driving pulse to realize; Because the switching of control mode is directly related with loading condition, so following method is adopted in the acquisition of driving pulse:
1) obtain the feedback signal of load circuit, said feedback signal is obtained through the negative feedback compensation operation by the feedback voltage of from load circuit, sampling;
2) judge the operating state of load according to said feedback signal, this deterministic process through to the computing of feedback signal and with relatively the carrying out of reference voltage: feedback signal is obtained frequency change control signal and phase-shifted control signal respectively after calculation process.The calculation process process of phase-shifted control signal is feedback signal to be carried out compare with first reference voltage of setting after the computings such as ratio or plus-minus; (or be higher than reference voltage if be lower than reference voltage; Logic behaviour according to circuit is confirmed; Here suppose that feedback signal is directly proportional with load voltage, feedback signal is low more, and load is light more) then directly export feedback signal after the computing as phase-shifted control signal.Otherwise export the first stable reference voltage as phase-shifted control signal, because the phase-shifted control signal of this moment does not change the situation of therefore controlling corresponding to simple PFM.First reference voltage need be confirmed according to the electrical characteristic of said load, makes whether the reaction load that can be in the main true of relatively judging of carrying out based on first reference voltage is operated in light condition.
The calculation process process of frequency change control signal can adopt dual mode; The one, directly feedback signal is carried out exporting as frequency change control signal after the computings such as ratio or plus-minus; Like this; Frequency change control signal changes with the variation of feedback signal all the time, so resonant circuit has remained the PFM control mode.Another is the compute mode of copying above-mentioned phase-shifted control signal; After computings such as ratio or plus-minus, also second reference voltage of result and setting is compared; If being higher than second reference voltage (or is lower than reference voltage, confirms according to the logic behaviour of circuit, suppose that here feedback signal is directly proportional with load voltage; Feedback signal is low more, and load is light more) then directly export feedback signal after the computing as frequency change control signal.Therefore otherwise export the second stable reference voltage as frequency change control signal, because the frequency change control signal of this moment do not change, corresponding to the situation of simple phase shifting control.Second reference voltage need be confirmed according to the electrical characteristic of said load equally, makes whether the reaction load that can be in the main true of relatively judging of carrying out based on second reference voltage is operated in approximate Light Condition.And; In order to guarantee to control to PFM+ phase shifting control taking over seamlessly to phase shifting control again from PFM; If load then must be operated in light condition according to the judgement of first reference voltage according to the judgment task of second reference voltage at approximate Light Condition; This has also just guaranteed under any situation, has at least one to be that variation with feedback signal changes in phase-shifted control signal and the frequency change control signal.
3) according to step 2) judged result; If loaded work piece is in non-light condition; Phase-shifted control signal stabilizes to first reference voltage; And frequency change control signal changes with the variation of feedback signal, therefore under the control of these two signals output be stable and the driving pulse that frequency changes with feedback signal of phase shifting angle, resonant circuit is operated in the PFM control model at this moment; If loaded work piece is in light condition; Phase-shifted control signal and frequency change control signal all change with the variation of feedback signal; What therefore under the control of these two signals, export is that frequency and phase shifting angle all change and the common driving pulse of regulating with feedback signal, and this moment, resonant circuit was operated in PFM+ phase shifting control pattern; If loaded work piece is at approximate Light Condition; Phase-shifted control signal changes with the variation of feedback signal; And frequency change control signal stabilizes to second reference voltage; Therefore under the control of these two signals output be frequency stabilization and driving pulse that phase shifting angle changes with feedback signal, resonant circuit is operated in the phase shifting control pattern at this moment.
Introduce a kind of resonance DC/DC converter that adopts above-mentioned control method below in detail,, comprise in conjunction with Fig. 4 and Fig. 5 A, 5B, 5C
Drive circuit resonant circuit, said drive circuit is according to the input switch pipe of the driving pulse control resonant circuit of input, and resonant circuit offers load circuit with the power supply after the conversion under the control of said drive circuit, and
The negative feedback compensated regulator is served as by pi regulator, and the given voltage of the feedback voltage that will from load circuit, sample and setting carries out obtaining feedback signal behind the negative feedback compensation operation;
Discriminator comprises first computing circuit 1 and second computing circuit 2, and said first computing circuit 1 and second computing circuit 2 are set with first reference voltage and second reference voltage respectively; Feedback signal through first computing circuit carry out computing, with first reference voltage relatively after, be output as phase-shifted control signal; Feedback signal is carried out computing, is output as frequency change control signal with second reference voltage after relatively through second computing circuit; First reference voltage and second reference voltage all confirm that according to the electrical characteristic of load its setting principle is identical with the description in the aforementioned control method, repeats no more at this.Its establishing method can adopt measurement method; Such as: make loaded work piece at underloading and approximate unloaded two states artificially respectively; Measure the size of the input feedback signal of in first computing circuit and second computing circuit, comparing with first reference voltage and second reference voltage respectively under this two states respectively, this value promptly can be used as the value of first reference voltage and second reference voltage.When loaded work piece during at approximate Light Condition, frequency change control signal (i.e. second reference voltage) that discriminator output is stable and the phase-shifted control signal that changes with feedback signal; When loaded work piece during in light condition, phase-shifted control signal and frequency change control signal that discriminator output all changes with feedback signal; In addition, the frequency change control signal that changes with feedback signal of discriminator output and stable phase-shifted control signal (i.e. first reference voltage).
Drive-pulse generator comprises frequency conversion control circuit and phase-shift control circuit.Frequency conversion control circuit comprises voltage-frequency oscillator and the triangular-wave generator that connects successively; Phase-shift control circuit is that phase shifting control produces circuit.Its frequency of oscillation of frequency change control signal input voltage-frequency oscillator control; The voltage-frequency oscillator becomes the square-wave signal that output frequency changes with the voltage signal of frequency change control signal, and the square-wave signal that triangular-wave generator receives this frequency change produces the triangular signal of frequency change and outputs to the synchronous end that phase shifting control produces circuit; Phase shifting control produces circuit according to the phase-shifted control signal V from the input of comp end
CompFrequency conversion triangular signal to input carries out exporting driving pulse after the phase shifting control.Work as V
CompStablize when being output as first reference voltage, the phase shifting angle of driving pulse no longer changes, and has only frequency change, promptly gets into PFM control; Work as V
CompWhen all changing output with frequency change control signal, the phase shifting angle and the frequency of driving pulse change simultaneously, promptly get into the PFM+ phase shifting control; When frequency change control signal is stable when being output as second reference voltage, the frequency of driving pulse no longer changes, and has only phase shifting angle to change, and promptly gets into phase shifting control.
Generally making reference signal 1 is the half the of triangular wave peak value, and the driving pulse of when the PFM control model, exporting like this has 50% duty ratio.Certainly, according to application need, also can cancel independent PWM control mode, make the output frequency of driving pulse relevant with feedback signal all the time, this just is equivalent to reference signal 2 is set to 0.
The module that can realize frequency conversion control circuit and pulse-width modulation circuit function is integrated in the chip piece usually; Difference according to use chip internal function structure; Physical circuit relation between them can have more situation, and for example pulse-width modulation circuit also can be with pulse-width signal and the relatively more synthetic back output of frequency conversion triangular signal driving pulse.That but simplifies it seems that frequency conversion control circuit and pulse-width modulation circuit always may be summarized to be the circuit relationships of series connection, and promptly frequency conversion control circuit produces pulse signal and controls its frequency, and pulse-width modulation circuit is then further confirmed the duty ratio of pulse signal.
As shown in Figure 6, be the feedback signal V of the negative feedback compensated regulator output of above-mentioned resonance DC/DC converter
fWith the functional relation of resonant circuit operating frequency f and resonant circuit output V,
Wherein, transverse axis is represented the feedback signal V of negative feedback compensated regulator output
f, and the highest output of supposition negative feedback compensated regulator 12v.The operating state of above-mentioned resonance DC/DC converter is described below:
When feedback signal when a～b changes, control frequency is constant, is f=fmax, phase shifting angle changes to α from 180 degree
0Degree; Resonant circuit output V changes to V1 from 0; Mode of operation is a phase shifting control.
When feedback signal when b～c changes, control frequency and duty ratio change simultaneously: phase shifting angle is from α
0Degree changes to 0 degree, causes output voltage to continue to rise; Simultaneously, control frequency also is reduced to f0 from fmax, and this variation also causes rise of output voltage; When loop voltage rose to b, phase shifting angle reached maximum 0 degree, and output voltage rises to V2; Working method is the PFM+ phase shifting control.
When feedback signal when b～12V changes, phase shifting angle is constant, control frequency continues to drop to fmin from f0, output voltage continues to rise, when f=fmin, output voltage reaches maximum V3; Mode of operation is PFM control.
As can be seen from Figure 6, feedback signal raises, and output voltage also raises, so can do closed-loop control.The corresponding reference signal 1 of confirming first computing circuit of c among Fig. 6, the corresponding reference signal 2 of confirming second computing circuit of b; When control system does not comprise pure pwm pattern, b=0.
The waveform of driving pulse is as shown in Figure 7 under the different control models; Waveform A is the drive pulse waveform that stabilizes to 0 degree phase shifting angle under the PFM control; Waveform B is the drive pulse waveform under the PFM+ phase shifting control; The phase shifting angle of driving pulse and frequency change with output voltage regulates, and is 180 degree up to phase shifting angle.
Above-mentioned resonance DC/DC converter has adopted the frequency conversion control circuit and the phase-shift control circuit structure of connecting on the circuit to realize in logic optional side by side PFM control and PFM+ phase shifting control scheme; In fact also can adopt alternative dispensing means; As shown in Figure 8; Promptly adopt two relatively independent drive signal generation circuit modules, set up frequency conversion control circuit and VFC+phase-shift control circuit respectively; Make discriminator optionally control one of them output then and satisfy the driving pulse that the present invention controls requirement according to the load judgment situation; That is: if said discriminator judges that loaded work piece is at underloading or Light Condition; Then, control its output frequency and phase shifting angle and change and the common driving pulse of regulating with feedback signal to VFC+phase-shift control circuit output driving pulse modulation signal; Otherwise,, control the driving pulse that the stable and frequency of its output phase shifting angle changes with the variation of feedback signal then to frequency conversion control circuit output driving pulse modulation signal.This possibility can be realized the object of the invention equally, only compares with aforementioned preferred version to have more complicated form.
Used negative feedback compensation operation is not only can realize with pi regulator among the present invention, also available PID adjuster and more flexibly adjuster wait and realize.
Control mode of the present invention is applicable to the circuit that uses resonance principle work, comprises series resonance, parallel resonance, series parallel resonance etc., and circuit topology can be a full-bridge.When the operating frequency of resonant circuit is hanged down, make converter be operated in the VFC mode; And when operating frequency is higher, make converter be operated in VFC+phase-shift control mode, and so just avoided under unloaded and the underloading condition, the problem that switching frequency is too high, output voltage is stable when helping underloading.The present invention can be realized that when circuit switched, switching was level and smooth, had guaranteed the reliability of circuit working by simple circuit configuration between the state of different control modes.
VFC+phase shifting control of the present invention, VFC and discriminator circuit etc. both can adopt hardware circuit to build also and can realize through the chip with the corresponding function module is programmed with software according to control method of the present invention, this part work be those of ordinary skill in the art according to above-mentioned technical scheme institute easily derivation come out.
Claims (10)
1. the control method of a resonance DC/DC converter, the resonant circuit input switch pipe of said converter can be controlled through drive circuit by driving pulse, and the acquisition of said driving pulse comprises the steps,
A, obtain the feedback signal of load circuit;
B, judge according to said feedback signal whether load is operated in underloading or Light Condition;
If the C loaded work piece is at underloading or Light Condition, then frequency and phase shifting angle are changed with feedback signal and the common pulse signal of regulating as the driving pulse of drive circuit, make resonant circuit be operated in phase shifting control and control mixed mode with PFM; Otherwise the pulse signal that the stable and frequency of phase shifting angle is changed with feedback signal makes resonant circuit be operated in the PFM control model as the driving pulse of drive circuit.
2. the control method of resonance DC/DC converter as claimed in claim 1, it is characterized in that: said steps A comprises the steps:
A1, from load circuit sampling feedback voltage;
A2, said feedback voltage is carried out the negative feedback compensation operation obtain feedback signal.
3. the control method of resonance DC/DC converter as claimed in claim 1 is characterized in that: among the said step B feedback signal is obtained frequency change control signal and phase-shifted control signal respectively after calculation process; The calculation process process that obtains said phase-shifted control signal comprises the feedback signal after the computing and first reference voltage are compared to judge whether load is operated in the step of underloading or Light Condition, and said first reference voltage is confirmed according to the electrical characteristic of said load.
4. the control method of resonance DC/DC converter as claimed in claim 3; It is characterized in that: the calculation process process that obtains said frequency change control signal among the said step B comprises the feedback signal after the computing and second reference voltage compared judges whether load is operated in the step of approximate Light Condition; Said second reference voltage is confirmed according to the electrical characteristic of said load; And said second reference voltage satisfies, if load then must be operated in underloading or Light Condition according to the judgement of first reference voltage according to the judgment task of second reference voltage at approximate Light Condition; When loaded work piece during, promptly produce frequency stabilization and the driving pulse regulated separately by phase-shifted control signal among the said step C at approximate Light Condition.
5. resonance DC/DC converter; Comprise drive circuit resonant circuit; Said drive circuit is according to the input switch pipe of the driving pulse control resonant circuit of input; Resonant circuit offers load circuit with the power supply after the conversion under the control of said drive circuit, it is characterized in that: also comprise:
Negative feedback compensated regulator, the feedback voltage that will from load circuit, sample carry out obtaining feedback signal behind the negative feedback compensation operation;
Discriminator is according to the load condition of the feedback signal judgement load circuit of importing, output driving pulse modulation signal;
Drive-pulse generator, according to the driving pulse modulation signal modulation and the output driving pulse of input: if loaded work piece at underloading or Light Condition, the frequency of the driving pulse of output and phase shifting angle change with feedback signal and common adjusting; Otherwise the stable and frequency of the phase shifting angle of the driving pulse of output changes with the variation of feedback signal.
6. resonance DC/DC converter as claimed in claim 5 is characterized in that: said drive-pulse generator comprises frequency conversion control circuit and VFC+phase-shift control circuit; If said discriminator is judged loaded work piece at underloading or Light Condition, then, control its output frequency and phase shifting angle and change and the common driving pulse of regulating with feedback signal to VFC+phase-shift control circuit output driving pulse modulation signal; Otherwise,, control the driving pulse that the stable and frequency of its output phase shifting angle changes with the variation of feedback signal then to frequency conversion control circuit output driving pulse modulation signal; Perhaps said drive-pulse generator comprises frequency conversion control circuit and phase-shift control circuit; Said frequency conversion control circuit produces the variable-frequency pulse of frequency by frequency change control signal control, and said phase-shift control circuit carries out said variable-frequency pulse to export driving pulse after the phase shifting control according to phase-shifted control signal.
7. resonance DC/DC converter as claimed in claim 5; It is characterized in that: said discriminator comprise first computing circuit and with second computing circuit; Said first computing circuit is set with first reference voltage, and said driving pulse modulation signal comprises frequency change control signal and phase-shifted control signal; Said feedback signal through first computing circuit carry out computing, with first reference voltage relatively after, be output as phase-shifted control signal; Said feedback signal carries out being output as frequency change control signal after the computing through second computing circuit; Said first reference voltage confirms according to the electrical characteristic of load, makes that the phase-shifted control signal of output changes with the variation of feedback signal when loaded work piece during at underloading or Light Condition; Otherwise, then keep stable.
8. like the said resonance DC/DC converter of claim 6, it is characterized in that: said phase-shift control circuit is with phase-shifted control signal and the relatively more synthetic back output of variable-frequency pulse driving pulse.
9. like the said resonance DC/DC converter of claim 7, it is characterized in that: said second computing circuit is set with second reference voltage; Said feedback signal through second computing circuit carry out computing, with second reference voltage relatively after, be output as frequency change control signal; Said second reference voltage confirms according to the electrical characteristic of load, makes that the frequency change control signal of output keeps stablizing when loaded work piece during at approximate Light Condition; Otherwise then the variation with feedback signal changes; And said second reference voltage satisfies, if load then must be operated in underloading or Light Condition according to the judgement of first reference voltage according to the judgment task of second reference voltage at approximate Light Condition.
10. like the said resonance DC/DC converter of claim 6, it is characterized in that: said frequency conversion control circuit comprises voltage-frequency oscillator and the triangular-wave generator that connects successively; Said its frequency of oscillation of frequency change control signal input voltage-frequency oscillator control, the controlled variable-frequency pulse of said triangular-wave generator output frequency.
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