CN104218806A - Method and circuit for controlling fly-back switching power supplies of zero-voltage switches - Google Patents
Method and circuit for controlling fly-back switching power supplies of zero-voltage switches Download PDFInfo
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Abstract
The invention discloses a scheme for controlling fly-back switching power supplies of zero-voltage switches. The scheme for controlling the fly-back switching power supplies has the advantages that the traditional rectifying tubes of auxiliary power supplies are replaced by controllable auxiliary power switching tubes by the design, the auxiliary power switching tubes are turned on for a period of time before a main power switching tube is turned on, accordingly, a primary winding of a transformer is reversely excited to generate negative currents, parasite diodes of the main power switching tube are turned on, the main power switching tube can be turned on at zero voltage, turn-on loss of the main power switching tube can be reduced, redundant energy of the auxiliary power supplies can be fed to input ends, and the efficiency of a circuit can be improved.
Description
Technical field
The present invention relates to inverse-excitation type switch power-supply field, particularly relate to a kind of inverse-excitation type switch power-supply control method and the circuit with zero voltage switch.
Background technology
Along with the development of technology, high frequency has become a kind of trend of Switching Power Supply development, high frequency effectively can reduce the volume of Switching Power Supply, but high frequency also causes the switching tube loss of switching device to increase, so how to realize the emphasis that switching device no-voltage, zero current turning-on, shutoff also become high frequency research while high frequency.
Have that circuit structure is simple, with low cost, the reverse excitation circuit of excellent performance topology is widely used in the Switching Power Supply of middle low power, inverse-excitation type switch power-supply has continuous mode and discontinuous mode two kinds of mode of operations, generally continuous mode realizes no-voltage, Zero Current Switch difficulty is larger, therefore there be limited evidence currently of has the technology of this aspect, and rectifying tube can realize zero-current switching under discontinuous mode, and the requirement can opened by simple control realization master power switch pipe no-voltage.
Application number is teach a kind of control mode realizing main switch no-voltage and open in patent of invention " the ZERO VOLTAGE SWITCHING IN FLYBACK CONVERTERS WITH VARIABLE INPUT VOLTAGES " patent of US2013/0148385A1, in this patent mainly for can not realize completely under quasi-resonance control model low pressure input and high input voltage under no-voltage open-minded, a kind of new control mode is proposed, circuit of synchronous rectification basis increases a control signal and realizes following function, before former limit switching tube is opened, first secondary rectifying tube is opened one end time, realize the reverse excitation of former limit winding, produce negative current, then former limit switch tube zero voltage is realized open-minded, and detect the service time length that input voltage height controls secondary rectifying tube.This patent formula can realize former limit switching tube in theory, and can to realize no-voltage when high-low pressure open-minded, but have following shortcomings:
1. by secondary rectifying tube secondary capacitance stores energy released and be fed back to former limit, realize main power tube no-voltage open-minded, the power output of circuit is caused to reduce on the one hand, the efficiency of circuit reduces, synchronous rectification switch pipe is a kind of hard switching when releasing energy on the other hand,, output voltage comparatively large at reverse current will certainly cause larger switching loss higher, also increases the voltage stress of synchronous rectification switch pipe simultaneously.Both integrate and cause energy loss to open large many of the power consumption of saving than switch tube zero voltage possibly, although it is open-minded to achieve no-voltage like this, circuit efficiency is not still improved.
2. voltage needs, by detecting the reverse excitation time of input voltage regulation, to which increase the complexity of control circuit.
3., when the coupling of transformer primary vice-side winding is poor, when leakage inductance is larger, shortcoming 1 is even more serious by what become, easily causes whole module converts efficiency significantly to decline.
4. with reference to the method for designing mentioned in this patent, when high input voltage, if Vin>nVo will realize former limit, switch tube zero voltage is open-minded, then synchronous rectifier will open the longer time, storage capacitor discharges abundant energy, produce enough negative current open-minded to realize former limit switch tube zero voltage for former limit resonance, although also mention in the patent like this, can realize no-voltage opens minimizing turn-on consumption, but have lost more secondary energy, need during design to consider that no-voltage opens the power consumption of saving and the compromise of opening the energy of institute's loss in order to realize no-voltage.
Be published in the paper " capacitor-clamped zero voltage switch synchronous rectification flyback converter " on volume the 4th phase April the 29th in 2014 " electrotechnics journal " and talk about by the larger capacitive absorption transformer leakage inductance of capacitance in parallel between master power switch pipe drain-source pole, the effect utilizing the similar control scheme told about in patent US2013/0148385A1 " ZERO VOLTAGE SWITCHING IN FLYBACK CONVERTERS WITH VARIABLE INPUT VOLTAGES " to realize main power tube no-voltage to open.Although the leakage inductance energy of capacitive absorption is fed back to power input by the program, same when breaking in former frontier juncture, control secondary rectifying tube is opened and is realized the reverse excitation of transformer by output voltage, former limit winding produces reverse current, and then realize the effect that main power tube no-voltage opens, so also there is the low problem of conversion efficiency, under large leakage inductance situation cannot be solved equally, apply limited phenomenon.
Inverse-excitation type switch power-supply transformer at least has three windings, be respectively former limit input winding, secondary output winding and auxiliary power supply winding, wherein auxiliary power supply winding is for control IC in control system and other dissipative cell provide energy, this winding needs the energy that provides less relative to output, and this winding output end voltage allows the relative secondary output of excursion to want large.When transformer leakage inductance is larger, the meeting of auxiliary power supply winding is because two kinds of situations below the appearance of cross regulation rate: 1. when output load is lighter, because cross regulation rate causes auxiliary power supply, output voltage is lower, cannot meet the normal need of work of circuit; 2. during output heavier loads, because cross regulation rate causes auxiliary power supply, output voltage is higher, exceeds specified scope and damages device.Generally the method for solving the problem is: design auxiliary power supply winding voltage, even if when output end voltage is unloaded, accessory power supply voltage also can meet job requirement, then by voltage-stabiliser tube or use linear voltage regulator by force by auxiliary power supply limiting voltage in certain voltage range.Causing system normally to work although the method can solve because of cross regulation rate, there is following problem in above scheme:
1. the power limited of voltage-stabiliser tube, long-term work can obvious reduction of service life in breakdown conditions, affects reliability;
2. there is larger power loss when auxiliary winding voltage is higher in linear power supply, affects the operating efficiency of circuit, too increases the complexity of system simultaneously.
Summary of the invention
The object of the invention is, a kind of inverse-excitation type switch power-supply control method realizing no-voltage and open is provided, open-minded to realize no-voltage in master power switch Guan Quan input voltage range, promote circuit transmission efficiency, solve the wide fluctuations problem that accessory power supply causes because of cross regulation rate.
Corresponding therewith, another object of the present invention is, a kind of inverse-excitation type switch power-supply control circuit realizing no-voltage and open is provided, open-minded to realize no-voltage in master power switch Guan Quan input voltage range, promote circuit transmission efficiency, solve the wide fluctuations problem that accessory power supply causes because of cross regulation rate.
With regard to method, the invention provides a kind of inverse-excitation type switch power-supply control method of zero voltage switch, its rate-determining steps is as follows,
When the drive singal of main switch becomes low level from high level, the energy that transformer stores is transferred to the 3rd electric capacity by the first vice-side winding, and exports through the output plus terminal of inverse-excitation type switch power-supply circuit;
Meanwhile, give the second capacitance stores energy by the energy in transformer by the parasitic diode of auxiliary switch, and power to control system, with by complete for fault offset in transformer;
When the drive singal that control system exports auxiliary switch is high level by low transition, make auxiliary switch conducting, the energy stored in the second electric capacity carries out reverse excitation energy storage by auxiliary switch to the auxiliary winding of transformer;
When the drive singal that control system exports auxiliary switch is converted to low level by high level, auxiliary switch is turned off, the negative current that former limit winding produces flows to power supply input anode by the parasitic diode of main switch;
Before negative current direction overturns, the drive singal that control system exports main switch is high level by low transition, makes main switch conducting.
Preferably, the time (Δ t1) that the conducting of the relative auxiliary switch of the conducting of described main switch postpones is greater than the conducting duration (Δ t2) of auxiliary switch.
Preferably, described auxiliary switch closes has no progeny, before overturning to negative current direction during this period of time for auxiliary switch closes resonance time (the Δ t had no progeny
,), resonance time is by formula
determine.
Preferably, the relative auxiliary switch conducting of described main switch conducting postpone time (Δ t1), auxiliary switch conducting duration (Δ t2) and auxiliary switch close resonance time (the Δ t had no progeny
,) relation be, Δ t1=Δ t2+ Δ t, Δ t=1 ~ 1.5 Δ t
,; Meanwhile, the relative auxiliary switch conducting of main switch conducting postpone time (Δ t1), auxiliary switch conducting duration (Δ t2) and auxiliary switch close resonance time (the Δ t had no progeny
,) relation meet Δ t2+ Δ t
,< Δ t1< Δ t2+1.5 Δ t
,.
With regard to circuit, the invention provides the inverse-excitation type switch power-supply control circuit that a kind of no-voltage is opened, it is characterized in that, comprise inverse-excitation type switch power-supply circuit, for when the drive singal of main switch becomes low level from high level, the energy that transformer stores is transferred to the 3rd electric capacity by the first vice-side winding, and exports through the output plus terminal of inverse-excitation type switch power-supply circuit; Auxiliary power supply circuit, for the drive singal of main switch becomes low level from high level while, give the second capacitance stores energy by the energy in transformer by the parasitic diode of auxiliary switch, and power to control system, with by complete for fault offset in transformer; When the drive singal that control system exports auxiliary switch is high level by low transition, make auxiliary switch conducting, the energy stored in the second electric capacity carries out reverse excitation energy storage by auxiliary switch to the auxiliary winding of transformer; When the drive singal that control system exports auxiliary switch is converted to low level by high level, auxiliary switch is turned off, the negative current that former limit winding produces flows to power supply input anode by the parasitic diode of main switch; Before negative current direction overturns, the drive singal that control system exports main switch is high level by low transition, makes main switch conducting.
Preferably, described inverse-excitation type switch power-supply circuit, comprise the first resistance, main switch, the transformer with former limit winding and vice-side winding, the first diode and the 3rd electric capacity, the drain electrode of main switch is connected with the different name end of former limit winding, the Same Name of Ends of former limit winding is connected with input anode, the source electrode of main switch is connected with input negative terminal, the first resistance in parallel between main switch source electrode and grid; The different name end of vice-side winding is connected with the anode of the first diode, and the negative electrode of the first diode is connected with the 3rd electric capacity and output plus terminal respectively, and the other end of the 3rd electric capacity is connected with output negative terminal, and the Same Name of Ends of vice-side winding is connected with output negative terminal; Described auxiliary power supply circuit, comprise auxiliary switch, the auxiliary winding of transformer, the second resistance, the second electric capacity, control system and there is the sampling feedback circuit of signal input part and output, control system has Vcc end, the first drive singal end, the second drive singal end and FB end, the concrete annexation of described auxiliary power supply circuit is, the source electrode of auxiliary switch is connected with the different name end of auxiliary winding, the termination input negative terminal of the same name of auxiliary winding; The drain electrode of auxiliary switch is held with the Vcc of the second electric capacity and control system respectively and is connected, another termination input negative terminal of the second electric capacity; The grid of auxiliary switch is connected with the second drive singal end of control system, the second resistance in parallel between the grid of auxiliary switch and source electrode; The signal input part of sampling feedback circuit is connected with the negative electrode of the first diode, and the output of sampling feedback circuit is held with the FB of control system and is connected.
Preferably, control system, comprise Switching Power Supply control IC and signal processing circuit, described Switching Power Supply control IC exports the former drive singal of the certain duty ratio of certain frequency to signal processing circuit according to the signal of sampling feedback electronic feedback, the former drive singal of input is decomposed into the first drive singal and the second drive singal and point is exported by two-way by signal processing circuit, wherein the second drive singal is narrow spaces signal, its pulse duration is Δ t2, be used for driving auxiliary switch, the rising edge of the relatively former drive singal of the second drive singal is without time delay, and the first drive singal is relative to the rising edge time delay Δ t1 of former drive singal, the pulse duration of the first drive singal is consistent with the pulse duration of former drive singal, be used for driving main switch.
Preferably, signal processing circuit in the inverse-excitation type switch power-supply control circuit of described zero voltage switch, comprise, former drive singal end, first drive singal end, second drive singal end, Vcc holds, 5th diode, 5th electric capacity, 6th electric capacity, 6th resistance, 7th resistance, first N-channel MOS pipe, second N-channel MOS pipe, one P channel MOS tube, 2nd P channel MOS tube, its concrete annexation is, former drive singal end is connected to the 7th resistance, one end of 6th electric capacity and the 5th diode, wherein the 7th resistance and the 5th diodes in parallel, the other end of the 7th resistance and the 5th diode is connected to the 5th electric capacity, the grid of the one P channel MOS tube and the grid of the first N-channel MOS pipe, the other end ground connection of the 5th electric capacity, the source ground of the one P channel MOS tube, the drain electrode of the one P channel MOS tube is connected with the source electrode of the first N-channel MOS pipe and the first drive singal end respectively, the drain electrode of the first N-channel MOS pipe connects VCC end, the other end of the 6th electric capacity is connected to the negative electrode of voltage stabilizing didoe, the 6th resistance, the grid of the 2nd P channel MOS tube and the grid of the second N-channel MOS pipe, the other end of the 6th resistance and the plus earth of voltage stabilizing didoe, the source ground of the 2nd P channel MOS tube, the drain electrode of the 2nd P channel MOS tube is connected with the source electrode of the second N-channel MOS pipe and the second drive singal end respectively, and the drain electrode of the second N-channel MOS pipe connects VCC end.
Compared with prior art, the present invention has following technique effect:
Owing to have employed above control program, winding rectifying tube auxiliary in reverse exciting switching voltage regulator is designed to controlled switching tube device, switching tube device has two-way admittance and controllable characteristics, both the normal power supply of accessory power supply can have been realized, again can effectively by energy feedback unnecessary for accessory power supply to input, by controlling reverse excitation time, it is open-minded that lifting conversion efficiency realizes realizing no-voltage in master power switch Guan Quan input voltage range simultaneously, effectively reduce the turn-on consumption of master power switch pipe, the efficiency of further lifting circuit, the turn-on consumption of master power switch pipe significantly can be reduced when particularly input voltage is higher.Because accessory power supply in each switch periods needs to provide reverse magnetization energy to auxiliary winding; realize master power switch pipe no-voltage open-minded; from the angle analysis of ability conservation; be actually the load adding accessory power supply; the load increase of accessory power supply has following benefit: when output heavier loads; effectively inhibit because cross regulation rate causes accessory power supply voltage to raise, under the condition of dynamic load, particularly reduce the risk because of load variations triggering accessory power supply overvoltage protection.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention;
Fig. 2 is the circuit block diagram of the control system of the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention;
Fig. 3 is the concrete sequential chart of the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention;
Fig. 4 is the circuit theory diagrams of the first embodiment of the signal processing circuit of control system in the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention;
Fig. 5 is the circuit theory diagrams of the second embodiment of the signal processing circuit of control system in the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention.
Embodiment
Refer to Fig. 1, be the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention, it comprises: inverse-excitation type switch power-supply circuit and auxiliary power supply circuit,
Wherein, inverse-excitation type switch power-supply circuit, comprise resistance R1, the first switching tube Q1, there is transformer T1, diode D1 and the electric capacity C3 of former limit winding Np1 and vice-side winding Ns1, the drain electrode of the first switching tube Q1 is connected with the different name end of former limit winding Np1, the Same Name of Ends of former limit winding Np1 is connected with input anode Vi+, the source electrode of the first switching tube Q1 is connected with input negative terminal Vi-, the grid of the first switching tube Q1 is held with the drive singal DRV1 of control system and is connected, parallel resistance R1 between the first switching tube Q1 source electrode and grid; The different name end of vice-side winding Ns1 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected with electric capacity C3 and output plus terminal Vo+ respectively, and the other end of electric capacity C3 is connected with output negative terminal Vo-, and the Same Name of Ends of vice-side winding Ns1 is connected with output negative terminal.
Auxiliary power supply circuit, comprise second switch pipe Q2, auxiliary winding Np2, the resistance R2 of transformer T1, electric capacity C2, control system U1 and there is the sampling feedback circuit U 2 of signal input part and output, control system U1 has Vcc end, drive singal DRV1 end, drive singal DRV2 end and FB end, and (FB end is also known as signal feedback end, below unified referred to as FB end), the concrete annexation of this auxiliary power supply circuit is, the source electrode of second switch pipe Q2 is connected with the different name end of auxiliary winding Np2, the termination input negative terminal Vi-of the same name of auxiliary winding Np2; The drain electrode of second switch pipe Q2 is held with the Vcc of electric capacity C2 and control system U1 respectively and is connected, another termination input negative terminal Vi-of electric capacity C2; The grid of second switch pipe Q2 is held with the drive singal DRV2 of control system U1 and is connected; The drive singal DRV1 end of control system U1 is connected with the grid of switching tube Q1; Parallel resistance R2 between the grid of second switch pipe Q2 and source electrode; The signal input part of sampling feedback circuit U 2 is connected with the negative electrode of diode D1, and the output of sampling feedback circuit U 2 is held with the FB of control system U1 and is connected.Wherein, the accessory power supply VCC that electric capacity C2 provides as accessory power supply, change within the scope of VCCmin ~ VCCmax, voltage design meets
wherein, VCCmin meets the requirement of circuit minimum, and VCCmax meets the requirement of circuit maximum working voltage.
Refer to Fig. 2, control system U1, comprise Switching Power Supply control IC and signal processing circuit, Switching Power Supply control IC exports the drive singal DRV of the certain duty ratio of certain frequency to signal processing circuit according to the signal of sampling feedback electronic feedback, the drive singal DRV of input is done following process by signal processing circuit: signal processing circuit drive singal DRV is decomposed into drive singal DRV1 and DRV2 two-way exports, and the concrete sequential chart of each drive singal as shown in Figure 3.Wherein, DRV2 signal is narrow spaces signal, and its pulse duration is Δ t2, is used for driving switch pipe Q2, and the rising edge of the relative DRV signal of DRV2 signal is without time delay, and that is, when DRV signal changes high level into, DRV2 signal also changes high level into simultaneously.And DRV1 signal is relative to the rising edge time delay Δ t1 of DRV signal, Δ t1 also reflects the time of delay of DRV1 signal relative to DRV2 signal, the pulse duration of DRV1 signal and the pulse duration of DRV signal completely the same, be used for driving switch pipe Q1.Open master power switch pipe Q1 to realize no-voltage, Δ t1 time of delay of DRV1 signal need be greater than the pulse duration Δ t2 of DRV2 signal.
Refer to Fig. 3, the specific works process prescription of the inverse-excitation type switch power-supply control circuit of this zero voltage switch is as follows: when DRV1 signal becomes low level from high level, the vice-side winding Ns1 polarity upset of transformer T1, rectifier diode D1 conducting, the energy stored by transformer T1 is transferred to storage capacitor C3 by vice-side winding Ns1, and export to load resistance Ro through output plus terminal and power that (load resistance Ro can be connected to output plus terminal and export between negative terminal, because load resistance Ro is External connecting part, thus not shown in Figure 3).Auxiliary winding Np2 polarity also overturns simultaneously, the auxiliary switch Q2 parasitic diode conducting be connected with auxiliary winding Np2, and the energy in transformer T1 passes through auxiliary switch Q2 parasitic diode to accessory power supply electric capacity C2 energy storage, and powers to control system.In this process lasts to transformer T1, fault offset is complete, and in Δ t0 time before this process terminates, drive singal DRV is low level always.
When drive output signal DRV is high level by low transition, drive singal DRV1 and DRV2 is produced after control system processing of circuit, the relative DRV signal of DRV2 signal is without time delay, when DRV2 signal is high level, auxiliary switch Q2 conducting, the energy stored in accessory power supply storage capacitor C2 carries out reverse excitation energy storage by switching tube Q2 to the auxiliary winding Np1 of transformer T1, and vice-side winding Ns1 induced voltage is lower than output voltage Vo, and diode D1 is in cut-off state; Auxiliary switch Q2 is turned off after the Δ t2 time, auxiliary switch Q2 closes auxiliary winding Np2 polarity upset of having no progeny, just lower negative on former limit winding Np1, the negative current produced flows to power supply input anode Vi+ by the parasitic diode of master power switch pipe Q1, and the energy be stored in accessory power supply electric capacity C2 feeds back to input anode Vi+ in the process effectively.
After the Δ t1 time, namely before negative current direction overturns, opening master power switch pipe Q1, can to realize master power switch pipe Q1 no-voltage open-minded.Master power switch pipe Q1 opens rear former limit winding and starts forward excitation until drive singal DRV2 level is become from height low, and this process terminates.
Because auxiliary power supply circuit set up by the inverse-excitation type switch power-supply control circuit of this zero voltage switch, the conducting sequential of this auxiliary power supply circuit is ahead of master power switch pipe Q1's, the dump energy retained during so that switching tube Q1 is turned off, transfer foldback returns power input, and non-rigid shutoff, thus the no-voltage realizing switching tube Q1 is open-minded, effectively reduce the turn-on consumption of master power switch pipe Q1, the efficiency of further lifting circuit, particularly when output load is lighter, auxiliary power supply circuit is the resilience of power input foldback, thus greatly can improve the low problem of accessory power supply output voltage that cross regulation rate causes.And when input voltage is higher, because accessory power supply electric capacity C2 in each switch periods needs to provide reverse magnetization energy to auxiliary winding Np2, realize master power switch pipe Q1 no-voltage open-minded, from the angle analysis of ability conservation, be actually the load adding auxiliary power supply circuit, the load increase of auxiliary power supply circuit has following benefit: when output heavier loads, effectively inhibit because cross regulation rate causes accessory power supply voltage to raise, thus the turn-on consumption of master power switch pipe Q1 can be reduced significantly, particularly under the condition of dynamic load, reduce the risk because of load variations triggering auxiliary power supply circuit overvoltage protection.Again because the rectifying tube of winding Np2 auxiliary in inverse-excitation type switch power-supply circuit is designed to controlled switching tube device, switching tube device has two-way admittance and controllable characteristics, both the normal power supply of accessory power supply electric capacity C2 can have been realized, effectively the dump energy stored by accessory power supply electric capacity C2 can be fed back to input again, and the inverse-excitation type switch power-supply control circuit of this zero voltage switch is by controlling reverse excitation time, can realizing master power switch pipe Q1 while lifting conversion efficiency, in full input voltage range, realize no-voltage open-minded, the design of integrated circuit, debug simple.
Fig. 4 is the first embodiment of signal processing circuit in the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention, this signal processing circuit comprises, drive singal DRV holds, drive singal DRV1 holds, drive singal DRV2 holds, Vcc holds, diode D5, electric capacity C5, C6, resistance R6, R7, N-channel MOS pipe Q1A, Q2A, P channel MOS tube Q1B, Q2B, its concrete annexation is, drive singal DRV end is connected to resistance R7, one end of electric capacity C6 and diode D5, wherein resistance R7 and diode D5 is in parallel, the other end of resistance R7 and diode D5 is connected to electric capacity C5, the grid of metal-oxide-semiconductor Q1B and the grid of metal-oxide-semiconductor Q1A, the other end ground connection of electric capacity C5, the source ground of metal-oxide-semiconductor Q1B, the drain electrode of metal-oxide-semiconductor Q1B is held with the source electrode of metal-oxide-semiconductor Q1A and drive singal DRV1 respectively and is connected, the drain electrode of metal-oxide-semiconductor Q1A meets accessory power supply VCC and holds.The other end of electric capacity C6 is connected to the negative electrode of voltage stabilizing didoe D6, resistance R6, the grid of metal-oxide-semiconductor Q2B and the grid of metal-oxide-semiconductor Q2A, the other end of resistance R6 and the plus earth of voltage stabilizing didoe D6, the source ground of metal-oxide-semiconductor Q2B, the drain electrode of metal-oxide-semiconductor Q2B is held with the source electrode of metal-oxide-semiconductor Q2A and drive singal DRV2 respectively and is connected, and the drain electrode of metal-oxide-semiconductor Q2A meets accessory power supply VCC and holds.
The foregoing circuit course of work is described below:
When DRV input signal is high level, DRV signal forms charge circuit through electric capacity C6, resistance R6, is less than metal-oxide-semiconductor turning-on voltage V in resistance R6 both end voltage
gsthbefore, metal-oxide-semiconductor Q2A is conducting state always, and its ON time is Δ t2,
Δ t2=-RCln (V
gsth/ V
dRV) (formula 1)
In above-mentioned formula 1, R is resistance R6, and C is electric capacity C6, V
dRVfor the magnitude of voltage of enter drive signal DRV, V
gsthfor the switch threshold level of metal-oxide-semiconductor Q2A.
Switching tube Q2 conducting within the Δ t2 time, accessory power supply VCC is by assisting winding Np2 to the reverse excitation of transformer T1, on-off switching tube Q2 after the Δ t2 time, the each winding polarity of transformer T1 overturns, its limit, Central Plains winding Np1 polarity is upper just lower negative, former limit winding Np1 produces negative current, this negative current is through Δ t, after the electric charge stored in the junction capacitance of the drain-source interpolar of master power switch pipe Q1 being found time completely after time, the parasitic diode conducting of master power switch pipe drain-source interpolar parallel connection can be realized, opening master power switch pipe Q1 afterwards again, can to realize no-voltage open-minded.
When DRV input signal is high level, carry out time delay by resistance R7 and C5, delay time is Δ t1,
Δ t1=-RCln [(V
dRV-V
gsth)/V
dRV] (formula 2)
Wherein in above-mentioned formula 2, R is resistance R7, and C is electric capacity C5, V
dRVfor the magnitude of voltage of enter drive signal DRV, V
gsthfor the threshold level of metal-oxide-semiconductor Q1A, with reference to following formula
Δ t
,for auxiliary switch closes the resonance time of having no progeny, wherein L is the inductance value of transformer T1 former limit winding Np1, and C is the collector junction capacitance of master power switch pipe Q1.
Wherein, Δ t1, Δ t2 and Δ t
,relation be, Δ t1=Δ t2+ Δ t, Δ t=1 ~ 1.5 Δ t
,.
Open-minded in order to master power switch pipe no-voltage in full input voltage range can be realized, Δ t2, Δ t1, Δ t
,need following relationship be met:
Δt2+Δt
、<Δt1<Δt2+1.5Δt
、
When DRV signal changes low level into by high level, on electric capacity C5, voltage is dragged down rapidly by diode D5, and metal-oxide-semiconductor Q1A turns off, and Q1B is open-minded, and DRV1 signal is dragged down, and master power switch pipe Q1 turns off,
Fig. 5 is the second embodiment of signal processing circuit in the inverse-excitation type switch power-supply control circuit of zero voltage switch of the present invention, and design and the operation principle of this circuit are basically identical with Fig. 4, does not describe one by one at this.
Embodiments of the present invention are not limited thereto according to foregoing of the present invention; utilize ordinary technical knowledge and the customary means of this area; do not departing under the present invention's above-mentioned basic fundamental thought prerequisite; in the present invention, concrete implementing circuit can also make the amendment of other various ways, replacement or change, all drops within rights protection scope of the present invention.
Claims (8)
1. an inverse-excitation type switch power-supply control method for zero voltage switch, its rate-determining steps is as follows,
When the drive singal of main switch becomes low level from high level, the energy that transformer stores is transferred to the 3rd electric capacity by the first vice-side winding, and exports through the output plus terminal of inverse-excitation type switch power-supply circuit;
Meanwhile, give the second capacitance stores energy by the energy in transformer by the parasitic diode of auxiliary switch, and power to control system, with by complete for fault offset in transformer;
When the drive singal that control system exports auxiliary switch is high level by low transition, make auxiliary switch conducting, the energy stored in the second electric capacity carries out reverse excitation energy storage by auxiliary switch to the auxiliary winding of transformer;
When the drive singal that control system exports auxiliary switch is converted to low level by high level, auxiliary switch is turned off, the negative current that former limit winding produces flows to power supply input anode by the parasitic diode of main switch;
Before negative current direction overturns, the drive singal that control system exports main switch is high level by low transition, makes main switch conducting.
2. the inverse-excitation type switch power-supply control method opened of no-voltage according to claim 1, it is characterized in that, the time (Δ t1) that the conducting of the relative auxiliary switch of conducting of described main switch postpones is greater than the conducting duration (Δ t2) of auxiliary switch.
3. the inverse-excitation type switch power-supply control method opened of no-voltage according to claim 1, it is characterized in that, described auxiliary switch closes has no progeny, before overturning to negative current direction during this period of time for auxiliary switch closes resonance time (the Δ t had no progeny
,), resonance time is by formula
determine.
4. the inverse-excitation type switch power-supply control method opened of no-voltage according to claim 1, it is characterized in that, the time (Δ t1) that the relative auxiliary switch conducting of described main switch conducting postpones, the conducting duration (Δ t2) of auxiliary switch close with auxiliary switch resonance time (the Δ t had no progeny
,) relation be, Δ t1=Δ t2+ Δ t, Δ t=1 ~ 1.5 Δ t
,; Meanwhile, the relative auxiliary switch conducting of main switch conducting postpone time (Δ t1), auxiliary switch conducting duration (Δ t2) and auxiliary switch close resonance time (the Δ t had no progeny
,) relation meet Δ t2+ Δ t
,< Δ t1< Δ t2+1.5 Δ t
,.
5. the inverse-excitation type switch power-supply control circuit opened of no-voltage, is characterized in that, comprise
Inverse-excitation type switch power-supply circuit, for when the drive singal of main switch becomes low level from high level, the energy that transformer stores is transferred to the 3rd electric capacity by the first vice-side winding, and exports through the output plus terminal of inverse-excitation type switch power-supply circuit;
Auxiliary power supply circuit, for the drive singal of main switch becomes low level from high level while, give the second capacitance stores energy by the energy in transformer by the parasitic diode of auxiliary switch, and power to control system, with by complete for fault offset in transformer; When the drive singal that control system exports auxiliary switch is high level by low transition, make auxiliary switch conducting, the energy stored in the second electric capacity carries out reverse excitation energy storage by auxiliary switch to the auxiliary winding of transformer; When the drive singal that control system exports auxiliary switch is converted to low level by high level, auxiliary switch is turned off, the negative current that former limit winding produces flows to power supply input anode by the parasitic diode of main switch; Before negative current direction overturns, the drive singal that control system exports main switch is high level by low transition, makes main switch conducting.
6. the inverse-excitation type switch power-supply control circuit opened of no-voltage according to claim 5, is characterized in that,
Described inverse-excitation type switch power-supply circuit, comprise the first resistance, main switch, the transformer with former limit winding and vice-side winding, the first diode and the 3rd electric capacity, the drain electrode of main switch is connected with the different name end of former limit winding, the Same Name of Ends of former limit winding is connected with input anode, the source electrode of main switch is connected with input negative terminal, the first resistance in parallel between main switch source electrode and grid; The different name end of vice-side winding is connected with the anode of the first diode, and the negative electrode of the first diode is connected with the 3rd electric capacity and output plus terminal respectively, and the other end of the 3rd electric capacity is connected with output negative terminal, and the Same Name of Ends of vice-side winding is connected with output negative terminal;
Described auxiliary power supply circuit, comprise auxiliary switch, the auxiliary winding of transformer, the second resistance, the second electric capacity, control system and there is the sampling feedback circuit of signal input part and output, control system has Vcc end, the first drive singal end, the second drive singal end and FB end, the concrete annexation of described auxiliary power supply circuit is, the source electrode of auxiliary switch is connected with the different name end of auxiliary winding, the termination input negative terminal of the same name of auxiliary winding; The drain electrode of auxiliary switch is held with the Vcc of the second electric capacity and control system respectively and is connected, another termination input negative terminal of the second electric capacity; The grid of auxiliary switch is connected with the second drive singal end of control system, the second resistance in parallel between the grid of auxiliary switch and source electrode; The signal input part of sampling feedback circuit is connected with the negative electrode of the first diode, and the output of sampling feedback circuit is held with the FB of control system and is connected.
7. the inverse-excitation type switch power-supply control circuit opened of no-voltage according to claim 6, is characterized in that,
Described control system, comprise Switching Power Supply control IC and signal processing circuit, described Switching Power Supply control IC exports the former drive singal of the certain duty ratio of certain frequency to signal processing circuit according to the signal of sampling feedback electronic feedback, the former drive singal of input is decomposed into the first drive singal and the second drive singal and point is exported by two-way by signal processing circuit, wherein the second drive singal is narrow spaces signal, its pulse duration is Δ t2, be used for driving auxiliary switch, the rising edge of the relatively former drive singal of the second drive singal is without time delay, and the first drive singal is relative to the rising edge time delay Δ t1 of former drive singal, the pulse duration of the first drive singal is consistent with the pulse duration of former drive singal, be used for driving main switch.
8. the inverse-excitation type switch power-supply control circuit opened of no-voltage according to claim 7, it is characterized in that, signal processing circuit in the inverse-excitation type switch power-supply control circuit of described zero voltage switch, comprises, former drive singal end, first drive singal end, second drive singal end, Vcc holds, 5th diode, 5th electric capacity, 6th electric capacity, 6th resistance, 7th resistance, first N-channel MOS pipe, second N-channel MOS pipe, one P channel MOS tube, 2nd P channel MOS tube, its concrete annexation is, former drive singal end is connected to the 7th resistance, one end of 6th electric capacity and the 5th diode, wherein the 7th resistance and the 5th diodes in parallel, the other end of the 7th resistance and the 5th diode is connected to the 5th electric capacity, the grid of the one P channel MOS tube and the grid of the first N-channel MOS pipe, the other end ground connection of the 5th electric capacity, the source ground of the one P channel MOS tube, the drain electrode of the one P channel MOS tube is connected with the source electrode of the first N-channel MOS pipe and the first drive singal end respectively, and the drain electrode of the first N-channel MOS pipe connects VCC end, the other end of the 6th electric capacity is connected to the negative electrode of voltage stabilizing didoe, the 6th resistance, the grid of the 2nd P channel MOS tube and the grid of the second N-channel MOS pipe, the other end of the 6th resistance and the plus earth of voltage stabilizing didoe, the source ground of the 2nd P channel MOS tube, the drain electrode of the 2nd P channel MOS tube is connected with the source electrode of the second N-channel MOS pipe and the second drive singal end respectively, and the drain electrode of the second N-channel MOS pipe connects VCC end.
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