CN103944402A - Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter - Google Patents
Control method of excited push-pull converter with zero-voltage switching and excited push-pull converter Download PDFInfo
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Abstract
The invention discloses a control method of an excited push-pull converter with zero-voltage switching and the excited push-pull converter. According to the magnitude of exciting current of a coupling transformer in the excited push-pull converter, the dead time of two main power MOS tube driving signals output by a controller is adjusted, in the dead time, the energy of the exciting current of the coupling transformer is used for completely releasing charges stored in a parasitic capacitor of one main power MOS tube, needing to be switched from the switch-off state to the switch-on state, in the excited push-pull converter, when diodes which are arranged in the main power MOS tube and are connected in an anti-parallel mode are switched on, the controller outputs a driving signal to control the main power MOS tube to be switched on, and zero-voltage switching is realized. The conditions for realizing zero-voltage switching of the primary MOS tube are irrelevant to the range of an input voltage and an output load, and it can be ensured that zero-voltage switching of a circuit is realized within the full-load range.
Description
Technical field
The present invention relates to a kind of push-pull converter, particularly a kind of independent-excited push-pull converter with zero voltage switch characteristic, also relates to the control method of the independent-excited push-pull converter of zero voltage switch in addition.
Background technology
Push-pull converter circuit structure is simple, drive circuit is without isolation, transformer bi-directional excitation when circuit working, the utilance of magnetic core is high, therefore this converter has advantages of that volume is little, efficiency is high and dynamic response is good, but because the voltage stress of converter switching tube in the time of work is 2 times of input voltage, so this converter is often applied in the middle large-power occasions of low pressure input.
Push-pull converter circuit topology as shown in Figure 1, two switching tube Q1 in circuit are connected with the armature winding two ends with centre tapped isolating transformer respectively with Q2, transformer secondary is by rectifier diode D1 and D2, energy storage inductor L1 and filter capacitor C1 composition full-wave rectifier filter circuit, some output voltages without regulate or the application scenario not high to output voltage required precision, inductance L 1 in circuit can be omitted, in this case, push-pull converter is mainly by regulating the mode of transformer turn ratio to realize simple input and output voltage conversion.
Push-pull converter is in the process of work, by driving Signal-controlled switch pipe Q1 and Q2 to realize conducting in turn, when switching tube Q1 conducting, input voltage vin is added in by switching tube Q1 on the former limit winding Np1 of transformer, due to the effect of transformer, now the voltage at the switching tube Q2 two ends in off state is 2Vin, and within the time of switching tube Q1 conducting, input power Vin provides energy by transformer primary side winding Np1, secondary winding Ns2 to load.In like manner, in the time that switching tube Q1 switches to off state from conducting state, switching tube Q2 starts conducting, and now input power Vin provides energy by transformer primary side winding Np2, secondary winding Ns1 for load.In the process of switching in working order for fear of switching tube Q1 and Q2, there is the situation of conducting simultaneously, require to arrange a certain size " Dead Time " in the control procedure of switching tube Q1 and Q2.So-called " Dead Time ", is in a switch periods, drives Signal-controlled switch pipe Q1 and the Q2 duration in off state simultaneously.Dead Time control is mainly to drive the duty ratio size of signal to realize by adjusting.
Efficiency and volume are two important indexs that judge Switching Power Supply performance quality, in Switching Power Supply design, improving switching frequency is the important means that realizes Switching Power Supply miniaturization, but high frequencyization will make the core loss of transformer or inductance increase, the switching loss of power switch pipe is strengthened, also will bring the problem of more electromagnetic interference aspect simultaneously.Soft switch technique is to make power inverter be able to one of important technology of high frequency, it utilizes the resonance principle of electric capacity and inductance, and the electric current (or voltage) that makes switching device is by sinusoidal or approach sinusoidal rule variation, in the time of current over-zero, device is turn-offed, realize zero-current switching (ZCS, Zero Current Switching), or in the time of voltage zero-cross, make device open-minded, realize no-voltage and open (ZVS, Zero Voltagt Switching), thereby reduce switching loss.
Publication number 103078514A, on May 1 2013 publication date, name is called " a kind of push-pull converter with multiplication of voltage resonance ability " and has proposed a kind of secondary rectifier diode and have the push-pull converter of zero-current switching characteristic, and circuit structure is as shown in Figure 2.This circuit former limit part and conventional push-pull converter are basic identical, and transformer secondary adopts the mode of simplex winding output, and current rectifying and wave filtering circuit doubly flows rectification mode by adopting realizes.Meanwhile, in order to allow circuit have soft switching characteristic, the size of multiplication of voltage capacitor C s need to be carried out suitable choosing according to the equivalent leakage inductance of transformer secondary winding.The shortcoming of this implementation be the value of capacitor C s and the equivalent leakage inductance of transformer secondary winding closely related, manufacture process in, the leakage inductance precision of transformer primary secondary be difficult to control, while therefore batch production in batches the soft switching characteristic of circuit will be difficult to guarantee.Meanwhile, in order to realize zero-current switching, main power circuit need to add a multiplication of voltage electric capacity that has larger electric current tolerance, and the cost of circuit and volume are all increased to some extent.
Publication number 1592061, March 9 2005 publication date, name is called " push-pull converter and the method for power supply unit, uninterrupted power supply system " and has proposed a kind of former limit switching tube and have the push-pull converter of zero voltage switch characteristic, and circuit structure as shown in Figure 3.The circuit structure of this implementation and common push-pull converter are basic identical, and it is mainly to drive the mode of signal dutyfactor size to realize by change that the no-voltage of former limit switching tube is opened.The moments that two master power switch pipe operating states are switched on former limit, utilize the size of transformer excitation electric current, the switching tube parasitic capacitance that is about to switch to conducting state from off state is discharged, realize zero voltage switch with this.The control method of this scheme is: lower or be output as heavily loaded in the situation that at input voltage, push-pull converter need be operated in and drive signal dutyfactor to approach under 0.5 condition; And higher or be output as underloading in the situation that, push-pull converter is operated in PWM pattern at input voltage, the driving signal dutyfactor of now controlling two switching tubes in former limit obviously reduces, and under this mode of operation, circuit cannot be realized zero voltage switch.It is relevant with the size of output loading all the time that the shortcoming of this implementation is that circuit is realized the condition of zero voltage switch, and higher or be output as under the condition of underloading at input voltage, this control mode cannot realize zero voltage switch, especially under the condition of high frequency, will bring larger switching loss.
Summary of the invention
The technological deficiency existing for prior art, the object of this invention is to provide a kind of control method of independent-excited push-pull converter of zero voltage switch, the size that makes to realize the condition of former limit metal-oxide-semiconductor zero voltage switch and the scope of input voltage, output loading is irrelevant, can ensure that circuit realizes zero voltage switch in full-load range.
Another object of the present invention is to provide the independent-excited push-pull converter of above-mentioned control method.
To achieve these goals, first object of the present invention can realize by following technical measures: a kind of control method of independent-excited push-pull converter of zero voltage switch, regulate two of the controller output Dead Times that drive signal according to the size of transformer excitation electric current in push-pull converter, in Dead Time, by push-pull converter, one of them need to switch to the electric charge that the main power MOS pipe parasitic capacitance of conducting state stores from off state and discharges complete the energy that utilizes described transformer excitation electric current, when this main power MOS pipe inner counter is after parallel diode conducting, this main power MOS pipe conducting of described controller output drive signal control, realize zero voltage switch.
Two main power MOS pipes of controller control of the present invention drive the Dead Time scope Tdt of signal:
T
onmaxbe the maximum ON time of main power MOS pipe, Lm is expressed as the former limit magnetizing inductance amount of coupling transformer, C
sit is the parasitic capacitance size of main power MOS pipe.The parameter of two main power MOS pipes of push-pull circuit is all the same.
Another object of the present invention can realize by technical measures once: a kind of independent-excited push-pull converter of the zero voltage switch that adopts described control method, comprising:
One transformer, it comprises and has centre tapped the first former limit winding and the second former limit winding and at least one secondary winding;
An input voltage source, its positive pole is connected with the centre cap of transformer primary side winding, and negative pole is connected to ground;
The first main power MOS pipe, its drain electrode is connected with one end of the former limit of transformer first winding, and source electrode is connected to ground;
The second main power MOS pipe, its drain electrode is connected with one end of the former limit of transformer second winding, and source electrode is connected to ground;
The first described main power MOS pipe and the second main power MOS pipe have the diode of a parasitic capacitance and a reverse parallel connection separately;
One rectification filtering unit, it is connected with the second secondary winding with the first secondary winding of transformer, and the alternating voltage that secondary winding is produced is converted to direct voltage and provides energy for output loading;
Characterized by further comprising the controller for realizing two the main power MOS pipe zero voltage switch in former limit, described controller has the first driving signal output port and second and drives signal output port, first drives signal output port to be connected with the grid of the first main power MOS pipe, and second drives signal output port to be connected with the grid of the second main power MOS pipe;
Regulate two of the controller output Dead Times that drive signal according to the size of transformer excitation electric current in push-pull converter, in Dead Time, by push-pull converter, one of them need to switch to the electric charge that the main power MOS pipe parasitic capacitance of conducting state stores from off state and discharges complete the energy that utilizes described transformer excitation electric current, when this main power MOS pipe inner counter is after parallel diode conducting, this main power MOS pipe conducting of described controller output drive signal control, realizes zero voltage switch.
The Dead Time scope Tdt of two driving signals of described controller output:
Preferential, described controller drives the driving signal of 180 ° of two phase phasic differences of signal output port output, and the duty ratio equal and opposite in direction of two driving signals.
Preferential, described rectification filtering unit is a full-wave rectifying circuit, described transformer includes the first secondary winding and the second secondary winding, and described full-wave rectifying circuit is converted to direct voltage by the alternating voltage of the first secondary winding and the second secondary winding output and provides energy for output loading.
Further, in described full-wave rectifying circuit, adopt devices.
Preferential, described rectification filtering unit is a bridge rectifier, and described transformer comprises a secondary winding, and these secondary winding two ends connect bridge rectifier.
Preferential, described rectification filtering unit is a current-doubling rectifier, and described transformer comprises a secondary winding, and these secondary winding two ends connect current-doubling rectifier.
Beneficial effect of the present invention is: according to the size of transformer excitation electric current, by the zero voltage switch that regulates two to drive the Dead Time of signal to realize former limit metal-oxide-semiconductor, in circuit without adding any device in the situation that, only need just can realize former limit metal-oxide-semiconductor zero voltage switch by specific Dead Time control, can reduce on the one hand the volume of circuit, also reduce the total cost of circuit simultaneously.The exciting curent of transformer can not change along with the variation of output loading, and the condition and the output loading that therefore realize zero voltage switch are irrelevant, so can maintain higher conversion efficiency under full-load range.
Brief description of the drawings
Fig. 1 is prior art push-pull converter circuit theory diagrams;
Fig. 2 is the push-pull converter circuit theory diagrams that prior art has multiplication of voltage resonance ability;
Fig. 3 is the push-pull converter circuit theory diagrams that the former limit of prior art switching tube has zero voltage switch characteristic;
Fig. 4 is first embodiment of the invention circuit theory diagrams;
Fig. 5 is the work wave that first embodiment of the invention circuit test results draws;
Fig. 6 is first embodiment of the invention at the operating voltage waveform of two driving signal Dead Times circuit larger in the situation that;
Fig. 7 is second embodiment of the invention circuit theory diagrams;
Fig. 8 is third embodiment of the invention circuit theory diagrams;
Fig. 9 is fourth embodiment of the invention circuit theory diagrams.
Embodiment
Fig. 4 is first embodiment of the invention circuit theory diagrams, and as shown in the figure, this circuit comprises an input voltage source Vin, and its positive pole is connected with the former limit winding centre cap of transformer T1, and its negative pole is connected to ground; Also comprise the first main power MOS pipe Q11 and the second main power MOS pipe Q12 that connect with push pull mode, the drain electrode of the first main power MOS pipe Q11 is connected with one end of the former limit of transformer first winding, and source electrode is connected to ground; The drain electrode of the second main power MOS pipe Q12 is connected with one end of the former limit of transformer second winding, and source electrode is connected to ground; The grid of Q11 and Q12 is connected respectively the driving signal output port of controller.The secondary of coupling transformer T1 is connected with full-wave rectifier filter circuit, and full-wave rectifier filter circuit is mainly made up of diode D11, D12 and filter capacitor Co, and resistance R o is output loading.Above-mentioned controller drives the driving signal of 180 ° of two phase phasic differences of signal output port output, and the duty ratio equal and opposite in direction of two driving signals.Drive signal can utilize programmable digital signal processing chip (DSP) or single-chip microcomputer to draw, also can draw by special power management IC (as TL494 or SG3525).
Carrying out according to the size of transformer excitation electric current Dead Time that two of conditioning controller output drive signals is limited in the scope that formula specifies, in Dead Time, the energy that utilizes transformer excitation electric current need to switch to the electric charge that the main power MOS pipe parasitic capacitance of conducting state stores from off state by one of them and discharge complete, when metal-oxide-semiconductor inner counter is after parallel diode conducting, this main power MOS pipe conducting of controller output drive signal control, realizes zero voltage switch.
In Fig. 4, capacitor C s11 and Cs12, diode Ds11 and Ds12 are respectively parasitic capacitance and the body diodes of metal-oxide-semiconductor Q11 and Q12, and Lk11, Lk12, Lk13, Lk14 are respectively self the equivalent leakage inductances of winding Np11, Np12, Np13, Np14.In order to allow circuit more easily realize zero voltage switch, can allow between two, the former limit winding Np11 of coupling transformer T1 and Np12 coupling better, two winding coupled of former limit and secondary are poor, reaching Lk11, Lk12 is less, and the relatively large object of Lk13 and Lk14, the method that increases leakage inductance Lk13 and Lk14 can realize by the winding method that changes transformer.
Fig. 5 is the work wave that first embodiment of the invention circuit test results draws, in figure, Vgs is the main power MOS pipe Q11 of control of controller output and the driving voltage waveform signal of Q12 turn-on and turn-off, Vds1 and Vds2 are respectively the operating voltage waveform at main power MOS pipe Q1 and drain in the course of the work-source electrode of Q2 two ends, ID is secondary rectifier diode D11 and D12 current waveform in the course of the work, and IQ is the main power M0S pipe Q11 in former limit and Q12 current waveform in the course of the work.Utilize transformer excitation electric current to realize the operation principle of former limit metal-oxide-semiconductor zero voltage switch below by the course of work explanation of introducing this circuit.
T0～t1 moment: before the t0 moment, the exciting curent of transformer reaches reverse maximum, be Im(t0)=-Im, in the t0 moment, main power MOS pipe Q11 conducting, input voltage vin is through former limit winding Np11, leakage inductance Lk11, main power MOS pipe Q11 is to ground, because leakage inductance Lk11 is very little with respect to the magnetizing inductance of former limit, therefore input voltage vin is almost all added on former limit winding Np11, this moment transformer forward is excitatory, the different name end of former limit winding Np11 is for just, Same Name of Ends is for negative, can be drawn by transformer principle, transformer primary side winding Np12, secondary winding Ns11, the Same Name of Ends polarity of Ns12 is for negative, different name end is for just, the induced voltage of former limit winding Np12 is Vin, the voltage of main power MOS pipe Q12 is the input voltage of 2 times, be 2Vin, secondary diode D11 oppositely ends, D12 forward conduction, secondary winding Ns12 is by diode D12, leakage inductance Lk14 provides energy to load.In the t1 moment, main power MOS pipe Q11 turn-offs, t0-t1 stage, the exciting curent Im(t of transformer) rise to forward maximum+Im from reverse maximum-Im.
The t1-t2 moment: main power MOS pipe Q11 and Q12 are all in off state, and circuit enters Dead Time.In the t1 moment, main power MOS pipe Q11 turn-offs, and the exciting curent of transformer reaches forward maximum, i.e. Im(t1)=+ Im, if Dead Time is very short, can think that exciting curent remains unchanged in Dead Time, be equivalent to a constant-current source.Because inductive current can not suddenly change, the now polarity upset of former limit winding Np11, the Same Name of Ends of Np11 is being for just, and different name end is for negative, and the Same Name of Ends polarity of former limit winding Np12, secondary winding Ns11, Ns12 is also for just simultaneously, and different name end polarity is for bearing.Coupling transformer T1 degaussing in Dead Time, former limit winding Np11 gives the parasitic capacitance Cs11 charging of main power MOS pipe Q11, Np12 gives the parasitic capacitance Cs12 electric discharge of main power MOS pipe Q12 simultaneously, because the former limit winding Np11 of coupling transformer T1 and Np12 coupling are better, therefore the size of current of the charging and discharging of Cs11, Cs12 is identical, and its electric current is the half of transformer excitation electric current.In this process, the drain source voltage Vds1 of Q11 starts linear rising from 0V, and the drain source voltage Vds2 of Q12 is from linear decline of size of 2Vin.In the time that drain source voltage Vds1, the Vds2 of two main power MOS pipe Q11 and Q12 reach Vin, the voltage at former limit winding Np11 and Np12 two ends is 0V, can to maintain Vin constant for the voltage of Vds1 and Vds2 in theory, but because there is the existence of leakage inductance, Cs11, Cs12 can continue respectively charging and discharging.To the t2 moment, parasitic capacitance Cs12 is discharged to 0V, the body diode Ds12 conducting in parallel with it, and the no-voltage of this moment Q12 is opened condition and is established.Can draw according to the principle of electric capacity constant current charge (or electric discharge), the minimum interval that allows Vds2 drop to 0V in the t1-t2 stage is:
The trailing edge that wherein t12 is expressed as the driving signal 1 of realizing the main power MOS pipe zero voltage switch in former limit in the embodiment of the present invention is to minimum Dead Time between the rising edge of driving signal 2, Vin is the size of input voltage, Cs is the parasitic capacitance size of main power MOS pipe, is denoted as Cs11 and Cs12 in circuit theory diagrams shown in Fig. 4.Push-pull circuit requires to use the metal-oxide-semiconductor of same parameter conventionally, and therefore two parasitic capacitances are the same.Im is the maximum exciting curent of transformer, and this electric current can represent with following formula:
In above-mentioned expression formula, Tonmax is the maximum ON time of main power MOS pipe Q11, because the maximum ON time of two main power MOS pipes is consistent, the maximum exciting curent Imsat that the size of Tonmax will allow to pass through according to transformer excitation inductance L m, magnetic core of transformer determines, specifically can be according to formula
calculate; Lm is expressed as the former limit magnetizing inductance amount of coupling transformer, can show that the size of the minimum Dead Time of two driving signals is according to above two computing formula:
The t2-t3 moment: in the t2 moment, the junction capacitance Cs12 of main power MOS pipe Q12 is discharged to 0V, body diode Ds12 conducting, the condition of zero voltage switch is founded, meanwhile, the voltage of secondary winding Ns11 is greater than output voltage, secondary rectifier diode D11 conducting, the demagnetizing current of transformer provides energy through leakage inductance Ls13, rectifier diode D11 to load, when after secondary rectifier diode D11 conducting, secondary winding Ns11 is output voltage clamping, and the voltage Vs11 at its two ends can think to equal the big or small Vo of output voltage.Can know that according to the operation principle of transformer input voltage vin and output voltage V o exist following relation:
Wherein Nps is the turn ratio of former limit winding Np11 and secondary winding Ns11, and Vp11 and Vs11 are respectively the voltage of former limit winding Np11 and secondary winding Ns11.Can know from above-mentioned relation, in the t2-t3 moment, former limit winding Np11 voltage swing is approximately Vin, because of the turn ratio of transformer primary side winding Np11 and Np12 identical, the size of the voltage Vp12 of former limit winding Np12 is also approximately Vin, the drain source voltage Vds1 of main power MOS pipe Q11 is 2Vin, and the drain source voltage Vds2 of Q12 is 0V.Therefore, if ensure transformer in Dead Time also in degaussing, can realize former limit metal-oxide-semiconductor zero voltage switch.Because former limit leakage inductance Lk11, Lk12 are relatively little compared with secondary leakage inductance Lk13, Lk14, therefore in this process, the demagnetizing current major part of transformer all circulates on former limit, the body diode Ds12 of main power MOS pipe Q12 can realize reliable conducting, ensures that next stage Q12 its drain source voltage of conducting moment Vds2 is in minimum value.In the t3 moment, main power MOS pipe Q12 conducting, this stage finishes.
The t3-t4 moment: in the t3 moment, it is open-minded that main power MOS pipe Q12 realizes no-voltage, turn-on consumption is realized and being minimized, now input voltage arrives ground through former limit winding Np12, leakage inductance Lk12, main power MOS pipe Q12, transformer inverse-exciting, and secondary winding Ns11 provides energy by leakage inductance Lk13 and rectifier diode D11 to output loading, to the t4 moment, transformer excitation electric current reaches reverse maximum, i.e. Im(t4)=-Im, main power MOS pipe Q12 turn-offs.
After the t4 moment, by repeating the course of work of next cycle, just repeat no more at this.
Can draw from above-mentioned analysis, the present invention realizes the condition of zero voltage switch:
1, minimum ON time restriction:
According to law of conservation of energy, the energy that transformer stores must be greater than or equal to the summation of the junction capacitance storage power of two main power MOS pipes, if ON time is too short, the energy that transformer stores is too little, in Dead Time, the junction capacitance electric charge of main power MOS pipe just can not discharge complete, can not reach the condition of zero voltage switch, therefore the minimum ON time of main power MOS pipe must limit to some extent, its minimum ON time T
onmincan calculate by following formula:
Above two formulas of simultaneous can draw the minimum ON time of main power MOS pipe:
2, maximum Dead Time restriction:
Can learn from the course of work in t2-t3 moment, the condition that main power MOS pipe Q12 realizes zero voltage switch appears in the demagnetization process of coupling transformer T1, if but the Dead Time of two driving signals is oversize, allowing transformer have time enough to complete degaussing resets, the body diode Ds12 of the main power MOS pipe Q12 in former limit, secondary rectifier diode D11 can because demagnetizing current drop to zero and naturally shutoff, transformer secondary winding Ns11 is no longer output voltage clamping, now input voltage source Vin will pass through former limit winding Np12, leakage inductance Lk11 gives the parasitic capacitance Cs12 charging of main power MOS pipe Q12, its drain source voltage Vds2 starts to rise from 0V, in like manner the drain source voltage Vds1 at Q11 two ends starts to decline from 2Vin, in this process, circuit will produce vibration, under this condition, the work wave of circuit as shown in Figure 6.
Therefore, under the condition of growing at two driving signal Dead Times, circuit can not be realized zero voltage switch, in order to realize high efficiency power conversion, must be limited the maximum of transformer dead zone time.And according to weber equilibrium principle can show that it is the half of main power MOS pipe Q11 ON time that transformer demagnetizing current is released into time of zero from forward maximum+Im, that is:
Wherein T13 is expressed as the degaussing time of transformer, is also the maximum Dead Time that controller control two of the present invention drives signal simultaneously.
The present invention realizes zero voltage switch by the Dead Time size of controlling two the main power MOS pipes in former limit, can be drawn the scope of two driving signal Dead Time sizes by above analysis, in the time of circuit design, first determine the maximum ON time of two main power MOS pipes, just can obtain the Dead Time scope of two main power MOS pipes of controller control, represent with symbol Tdt at this:
Can find out from expression formula, the realization condition of the independent-excited push-pull circuit zero voltage switch shown in Fig. 4 and output loading are irrelevant, therefore as long as ensure that Dead Time that two of controller output drive signals is in the above in the scope of expression formula, circuit just can be realized zero voltage switch in full-load range, makes circuit have higher conversion efficiency.
Be second embodiment of the present invention circuit theory diagrams as shown in Figure 7, this embodiment is the self-powered synchronous rectification scheme of the first embodiment.As shown in the figure, be with the difference of the first embodiment, rectifier diode D11 and D12 in the first embodiment are replaced with devices Q23 and Q24 by the rectification circuit of secondary, the drain electrode of synchronous rectifier Q23 is connected with the Same Name of Ends of the secondary winding Ns21 of coupling transformer T2, source electrode is connected to the output of circuit, its grid is connected to the different name end of another winding of secondary Ns22, the drain electrode of Q24 is connected with the Same Name of Ends of the secondary winding Ns22 of coupling transformer T2, source electrode is connected to output, and its grid is connected to the Same Name of Ends of secondary winding Ns21.The synchronous rectification of push-pull circuit self-powered is current comparatively conventional known technology, because length is limit, just its operation principle is not described in detail at this.Second embodiment of the invention secondary adopts the mode of self-powered synchronous rectification can reduce the loss of rectifying part circuit, in conjunction with the control method of the driving of two described in the first embodiment signal Dead Time, can further improve the overall conversion efficiency of circuit.
The second main power MOS pipe in the former limit of embodiment is realized the operation principle of zero voltage switch with the first embodiment, just repeats no more at this.
Third embodiment of the present invention circuit theory diagrams as shown in Figure 8, as shown in the figure, be with the difference of the first embodiment, the coupling transformer T3 secondary of independent-excited push-pull circuit only has a winding Ns31, what be connected with secondary winding Ns31 two ends is a bridge rectifier, third embodiment of the invention secondary adopts bridge rectifier, drive the control method of signal Dead Time in conjunction with two described in the first embodiment, can realize higher conversion efficiency, simultaneously, transformer secondary is reduced to a winding, can better simplify the technique for coiling of transformer, reduce the man-hour of coiling transformer, thereby enhance productivity.
The 3rd main power MOS pipe in the former limit of embodiment is realized the operation principle of zero voltage switch with the first embodiment, just repeats no more at this.
Fourth embodiment of the present invention circuit theory diagrams as shown in Figure 9, as shown in the figure, be with the difference of the first embodiment, the coupling transformer T4 secondary of independent-excited push-pull circuit only has a winding Ns41, what be connected with secondary winding two ends is a current-doubling rectifier, four embodiment of the invention secondary adopts current-doubling rectifier, drive the control method of signal Dead Time in conjunction with two described in the first embodiment, higher conversion efficiency can be realized in application scenario at low-voltage, high-current, transformer secondary is reduced to a winding simultaneously, can better simplify the technique for coiling of transformer, reduce the man-hour of coiling transformer, thereby enhance productivity.
The 4th main power MOS pipe in the former limit of embodiment is realized the operation principle of zero voltage switch with the first embodiment, just repeats no more at this.
Below be only the preferred embodiment of the present invention; it should be noted that; above-mentioned preferred implementation should not be considered as limitation of the present invention; for those skilled in the art; without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention; here no longer repeat with embodiment, protection scope of the present invention should be as the criterion with claim limited range.
Claims (8)
1. a control method for the independent-excited push-pull converter of zero voltage switch, is characterized in that:
Regulate two main power MOS pipes of a controller output to drive the Dead Time of signal according to the size of coupling transformer exciting curent in push-pull converter, in Dead Time, the energy that utilizes described coupling transformer exciting curent by push-pull converter one need to switch to the electric charge that the main power MOS pipe parasitic capacitance of conducting state stores from off state and discharge complete, when this main power MOS pipe inner counter is after parallel diode conducting, this main power MOS pipe conducting of described controller output drive signal control, realizes zero voltage switch;
Two main power MOS pipes of described controller control drive the Dead Time scope Tdt of signal:
Tonmax is the maximum ON time of main power MOS pipe, and Lm is expressed as the former limit magnetizing inductance amount of coupling transformer, the parasitic capacitance size that Cs is main power MOS pipe.
2. control method according to claim 1, is characterized in that: two described driving signals are the driving signal of 180 ° of two phase phasic differences, and the duty ratio equal and opposite in direction of two driving signals.
3. an independent-excited push-pull converter that adopts the zero voltage switch of control method described in claim 1, comprising:
One transformer, it comprises and has centre tapped the first former limit winding and the second former limit winding and at least one secondary winding;
An input voltage source, its positive pole is connected with the centre cap of transformer primary side winding, and negative pole is connected to ground;
The first main power MOS pipe, its drain electrode is connected with one end of the former limit of transformer first winding, and source electrode is connected to ground;
The second main power MOS pipe, its drain electrode is connected with one end of the former limit of transformer second winding, and source electrode is connected to ground;
The first described main power MOS pipe and the second main power MOS pipe have the diode of a parasitic capacitance and a reverse parallel connection separately;
One rectification filtering unit, it is connected with the second secondary winding with the first secondary winding of transformer, and the alternating voltage that secondary winding is produced is converted to direct voltage and provides energy for output loading;
Characterized by further comprising the controller for realizing two the main power MOS pipe zero voltage switch in former limit, described controller has the first driving signal output port and second and drives signal output port, first drives signal output port to be connected with the grid of the first main power MOS pipe, and second drives signal output port to be connected with the grid of the second main power MOS pipe;
Regulate two of the controller output Dead Times that drive signal according to the size of coupling transformer exciting curent in push-pull converter, in Dead Time, by push-pull converter, one of them need to switch to the electric charge that the main power MOS pipe parasitic capacitance of conducting state stores from off state and discharges complete the energy that utilizes described coupling transformer exciting curent, when this main power MOS pipe inner counter is after parallel diode conducting, this main power MOS pipe conducting of described controller output drive signal control, realizes zero voltage switch;
Two of described controller outputs drive the Dead Time scope Tdt of signal:
Tonmax is the maximum ON time of main power MOS pipe, and Lm is expressed as the former limit magnetizing inductance amount of coupling transformer, the parasitic capacitance size that Cs is main power MOS pipe.
4. independent-excited push-pull converter according to claim 3, is characterized in that: described controller drives the driving signal of 180 ° of two phase phasic differences of signal output port output, and the duty ratio equal and opposite in direction of two driving signals.
5. independent-excited push-pull converter according to claim 3, it is characterized in that: described rectification filtering unit is a full-wave rectifying circuit, described transformer includes the first secondary winding and the second secondary winding, and described full-wave rectifying circuit is converted to direct voltage by the alternating voltage of the first secondary winding and the second secondary winding output and provides energy for output loading.
6. independent-excited push-pull converter according to claim 5, is characterized in that: in described full-wave rectifying circuit, adopt synchronous rectification mode to carry out rectification.
7. independent-excited push-pull converter according to claim 3, is characterized in that: described rectification filtering unit is a bridge rectifier, and described transformer comprises a secondary winding, and these secondary winding two ends connect bridge rectifier.
8. independent-excited push-pull converter according to claim 3, is characterized in that: described rectification filtering unit is a current-doubling rectifier, and described transformer comprises a secondary winding, and these secondary winding two ends connect current-doubling rectifier.
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