CN103346678A - Auxiliary switching tube isolating driver circuit of active clamping flyback circuit - Google Patents
Auxiliary switching tube isolating driver circuit of active clamping flyback circuit Download PDFInfo
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Abstract
An auxiliary switching tube isolating driver circuit of an active clamping flyback circuit comprises a tertiary winding, a drive processing circuit, a time delay circuit and a dead zone control circuit, wherein the tertiary winding, the drive processing circuit, the time delay circuit and the dead zone control circuit are arranged on the secondary side of a main transformer of the active clamping flyback circuit. When a main control circuit generates PWM signals to control a main switching tube to be connected, after voltages of the tertiary winding pass through the drive processing circuit, the voltages serve as turn-off logic level signals to be transmitted to the signal acquisition end of the dead zone control circuit, and thus the output end of the dead zone control circuit can output PWM2 signals which control an auxiliary switching tube to be cut-off. When the main switching tube is cut-off, after the voltages of the tertiary winding pass through the drive processing circuit, the voltages serve as turn-on logic level signals to be transmitted to the signal acquisition end of the dead zone control circuit, meanwhile, the voltages are transmitted to the input end of the dead zone control circuit through the time delay circuit, and when level signals of the input end of the dead zone control circuit are arranged between the top limitation and the bottom limitation of a comparison voltage threshold value, the output end of the dead zone control circuit outputs PWM2 signals which control the auxiliary switching tube to be connected. The auxiliary switching tube isolating driver circuit of the active clamping flyback circuit is simple and capable of saving cost and decreasing the size.
Description
Technical field
The present invention relates to the drive circuit technical field, particularly a kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation.
Background technology
In the middle of common multi-channel driver circuit, because switching tube is not altogether, need usually to adopt isolation drive to realize the control of switching tube.Be illustrated in figure 1 as active clamp circuit of reversed excitation theory diagram commonly used, power stage and main control loop are formed classical inverse and are swashed part, and auxiliary switch pipe and capacitor C are formed the active clamp part, and the pwm signal that main control circuit produces circuit of reversed excitation drives each switching tube work.Because main switch source ground, the floating ground of auxiliary switch pipe source electrode, therefore the signal demand that drives the auxiliary switch pipe is isolated, and in order to prevent that the conducting simultaneously of auxiliary switch pipe and main switch from destroying the course of work that classical inverse swashs, the driving signal that drives two switching tubes also needs to carry out dead band control simultaneously.Be illustrated in figure 2 as the adjustable isolated drive circuit in two-way band dead band, comprise the signal isolation circuit of differential circuit, dead band control circuit, pulse transformer transformer T1, capacitor C 3, C4 and the diode D1 composition of integrating circuit, R2 and C1 composition that R1 and C2 form.Wherein integration produces the different signal of two-way sequential with differential circuit, and output is as the input signal of dead band control circuit.Dead band control circuit feeder ear Vin is powered by the winding in the main control loop, its cut-away view is shown in Fig. 2-1, comprise voltage comparator and driving amplifier, Vin voltage is through Ra, the Rb dividing potential drop, a voltage comparison signal is provided for the negative terminal of comparator A and the anode of comparator B, two-way input signal Vi1, Vi2 carries out the signal conversion and amplifies the back output voltage signal through two comparators and two driving amplifiers respectively, resistance R a, the different values of Rb can change the comparative voltage upper threshold lower limit Vth of dead band control circuit, the size of Vtl, regulate the parameter of integrating circuit and differential circuit simultaneously, obtain the different dead band control times.A NPN S1 and a PNP S2 triode are formed No. one driving amplifier, and the signal demand that obtains after relatively through comparator improves driving force through driving amplifier.
When pwm signal was imported, signal produced the different signal of two-way sequential through integration with differential circuit, as the input signal of dead band control circuit, after the dead band control circuit is handled, formed the two-way that has the dead band and drove signal.Because of this two paths of signals in IC inside altogether, so one road signal must could the driving switch plumber be done through isolating, signal isolation circuit as shown in Figure 2, the PWM1 signal is not through isolating the main switch that can directly drive common ground, signal PWM2 through isolation processing then drives not the auxiliary switch pipe on ground altogether, can also drive main switch work by the pwm signal that main control circuit produces in addition.
Isolated drive circuit circuit shown in Figure 2 is simple, drive the influence that signal PWM2 amplitude is not subjected to duty ratio during stable state, but under the bigger situation of change in duty cycle, capacitor C 4 electric charges can't discharge immediately, cause the false triggering of auxiliary switch pipe easily, extra electric charge need be set usually discharge the loop, it is quite complicated that circuit becomes, and reliability is not high.Being connected as patent publication No. between the output PWM2 of Fig. 2 circuit and ground is discharge metal-oxide-semiconductor Q and the auxiliary winding of CN101621246, constitute the discharge loop of capacitor C 4, but the winding both end voltage of former secondary disappears at once when the former limit of transformer winding enters saturation condition because of original edge voltage, switching tube then can turn-off immediately, to lose C4 capacitance discharges function this moment, and also can have the risk that drives deficiency than hour tertiary winding in duty ratio.Being connected between the PWM of Fig. 2 circuit and PWM2 as patent publication No. is that discharge circuit is turn-offed in acceleration among the CN102307003, control discharges capacitor C 4 electric charge switching tubes, this circuit has solved the less problem that drives deficiency of duty ratio, but increased a pulse transformer and capacitance etc. newly, strengthened the design complexities of product; Fig. 2 realizes that PWM2 and the isolation of PWM1 signal need pulse transformer TI, capacitance C3, level to shift elements such as capacitor C 4, increase the volume of product to a certain extent simultaneously; Transformer T1, capacitor C 3, C4 respond time-delay in addition, and the dead band control circuit generates has dead band control time two-way and drive needs and suitably adjust, debug difficulties, and can influence the efficient of circuit even unusually when unreasonable when parameter arranges.
Summary of the invention
Purpose of the present invention just provides a kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation, and simple and saving cost is saved volume.
For achieving the above object, the present invention proposes a kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation, comprising:
Tertiary winding N3 is located at the main transformer primary side of active clamp circuit of reversed excitation;
Drive treatment circuit, the induced voltage of tertiary winding N3 is imported as it;
Delay circuit is to coming the signal lag of self-driven treatment circuit;
Dead band control circuit, its input Vi input are from the signal of delay circuit, and its signals collecting end A input comes the signal of self-driven treatment circuit, and its output end vo output drives second pwm signal of auxiliary switch pipe;
When main control circuit produces the conducting of first pwm signal control main switch, the voltage of tertiary winding N3 is after driving treatment circuit, for turn-offing logic level signal, deliver to the signals collecting end A of dead band control circuit, make the output end vo output of dead band control circuit control second pwm signal that the auxiliary switch pipe ends, when main control circuit produce first pwm signal control main switch by the time, the induced voltage of tertiary winding N3 is after driving treatment circuit, be the turn-on logic level signal, deliver to the signals collecting end A of dead band control circuit, simultaneously, the level signal of this driving treatment circuit output is delivered to the input Vi of dead band control circuit after the delay circuit time-delay, the level signal that receives as this input Vi is at comparative voltage threshold values bound Vth, in the time of between the Vtl, make second pwm signal of the output end vo output control auxiliary switch pipe conducting of dead band control circuit.
Further, also can comprise the power supply circuits that drive treatment circuit and the required operating voltage of dead band control circuit be used to providing, the induced voltage of tertiary winding N3 is as the input voltage of described power supply circuits.In one embodiment, these power supply circuits comprise rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1, the end of the same name of described tertiary winding N3 connects anode and the simulation ground of voltage-stabiliser tube Z1, the different name end connects the anode of rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1 parallel connection, the negative electrode of rectifier diode D1 connects the negative electrode of voltage-stabiliser tube Z1, and this tie point is supply power voltage end Vin; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, and rectifier diode D1 ends, and simulation ground is high level, capacitor C 1 discharge power supply, when main switch turn-offed, it was negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, rectifier diode D1 conducting power supply, simulation ground is low level, capacitor C 1 charging.Certainly, driving treatment circuit and the required supply power voltage of dead band control circuit also can be provided by other power supply circuits.
Preferentially, driving treatment circuit of the present invention comprises field effect transistor NMOS pipe Q1 and PMOS pipe Q2, the different name end of described tertiary winding N3 connects the grid of NMOS pipe Q1 and PMOS pipe Q2, the drain electrode of NMOS pipe Q1 connects supply power voltage end Vin, the drain electrode of PMOS pipe Q2 connects simulation ground, NMOS pipe Q1 links to each other with the source electrode of PMOS pipe Q2, and its tie point is for driving the output for the treatment of circuit; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, PMOS pipe Q2 conducting, then drive treatment circuit output low level signal, this low level signal is for turn-offing logic level signal, when main switch turn-offs, it is negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, NMOS pipe Q1 conducting, drive treatment circuit output high level signal, this high level signal is the turn-on logic level signal.
Preferentially, driving treatment circuit of the present invention comprises triode NPN pipe Q1 and PNP pipe Q2, the different name end of described tertiary winding N3 connects the base stage of NPN pipe Q1 and PNP pipe Q2 through resistance R 2, the collector electrode of NPN pipe Q1 connects supply power voltage end Vin, the collector electrode of PNP pipe Q2 connects simulation ground, NPN pipe Q1 links to each other with the emitter of PNP pipe Q2, and its tie point is for driving the output for the treatment of circuit; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, PNP pipe Q2 conducting, then drive treatment circuit output low level signal, this low level signal is for turn-offing logic level signal, when main switch turn-offs, it is negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, NPN pipe Q1 conducting, drive treatment circuit output high level signal, this high level signal is the turn-on logic level signal.
As seen, described NMOS pipe and PMOS pipe can be equal to alternative with NPN type triode and positive-negative-positive triode respectively, simultaneously in order to limit the base current of NPN type triode and positive-negative-positive triode, between the base stage tie point of NPN type triode and positive-negative-positive triode and tertiary winding different name end, be connected a resistance.
Preferentially, delay circuit of the present invention can comprise resistance R 1 and capacitor C 2, and an end of resistance R 1 connects the output that drives treatment circuit, and the other end connects an end of capacitor C 2, another termination simulation ground of this capacitor C 2, the tie point of resistance R 1 and capacitor C 2 is the output of delay circuit; When the main switch conducting, drive treatment circuit output low level signal, capacitor C 2 discharges, the signal voltage of delay circuit output reduces, when main switch turn-offs, drive treatment circuit output high level signal, to capacitor C 2 chargings, the signal voltage of delay circuit output rises this high level signal by resistance R 1.In order to solve the problem that capacitor discharge not exclusively under the underloading situation, the driving duty ratio diminishes, electric capacity is perishable, this delay circuit also comprises the diode D2 that releases, the negative electrode of this diode D2 that releases connects the output that drives treatment circuit, and anode connects the tie point of resistance R 1 and capacitor C 2.
Compared with prior art, the present invention satisfies when realizing isolation drive at the same time, also has following outstanding advantage:
1, by being set, the tertiary winding realizes main switch and auxiliary switch electrical isolation, can save elements such as isolating transformer and capacitance, solve the problem that traditional isolated drive circuit needs extra auxiliary circuit to discharge in the duty ratio sudden change, circuit is simple, volume reduces, cost reduces;
2, auxiliary switch drives and takes from the tertiary winding, power supply circuits, driving treatment circuit, delay circuit, dead band control circuit voltage signal processed, and amplitude is not influenced by the duty ratio size, does not have the not enough problem that drives;
3, tertiary winding design easily, need not to consider parameter setting in traditional isolated drive circuit, the reliability of circuit working is improved, and the dead band control time does not need to discharge and recharge time-delay adjustment according to elements such as isolating transformer, electric capacity simultaneously, has characteristics such as debugging is convenient, control is accurate.
Description of drawings
Fig. 1 is active clamp circuit of reversed excitation commonly used;
Fig. 2 is the adjustable isolated drive circuit schematic diagram in two-way band dead band commonly used in the prior art;
Fig. 2-1 is the cut-away view of the dead band control circuit of Fig. 2;
Fig. 3 is the embodiment of the invention one schematic diagram;
Fig. 3-1 is the circuit structure diagram of the dead band control circuit of Fig. 3;
Fig. 4 is the embodiment of the invention two schematic diagrams;
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Embodiment one
As shown in Figure 3, the embodiment of the invention one comprises: tertiary winding N3, power supply circuits 1, driving treatment circuit 2, delay circuit 3 and dead band control circuit 4.
Tertiary winding N3 is located at the main transformer primary side of active clamp circuit of reversed excitation.Power supply circuits 1 comprise rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1, the end of the same name of described tertiary winding N3 connects anode and the simulation ground of voltage-stabiliser tube Z1, the different name end connects the anode of rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1 parallel connection, the negative electrode of rectifier diode D1 connects the negative electrode of voltage-stabiliser tube Z1, and this tie point is supply power voltage end Vin.Drive treatment circuit 2 and comprise field effect transistor NMOS pipe Q1 and PMOS pipe Q2, the different name end of described tertiary winding N3 connects the grid of NMOS pipe Q1 and PMOS pipe Q2, the drain electrode of NMOS pipe Q1 connects supply power voltage end Vin, the drain electrode of PMOS pipe Q2 connects simulation ground, NMOS pipe Q1 links to each other with the source electrode of PMOS pipe Q2, and its tie point is for driving the output for the treatment of circuit 2.Delay circuit 3 comprises resistance R 1, capacitor C 2 and the diode D2 that releases, the release negative electrode of diode D2 and an end of resistance R 1 is connected the output that drives treatment circuit 2, the anode of this diode D2 that releases is connected an end of capacitor C 2 with the other end of resistance R 1, another termination simulation ground of this capacitor C 2, the tie point of resistance R 1 and capacitor C 2 is the output of delay circuit 3.The input Vi input of dead band control circuit 4 is from the signal of delay circuit 3, and signals collecting end A input comes the signal of self-driven treatment circuit 2, and output end vo output drives the PWM2 signal of auxiliary switch pipe.
The circuit structure diagram of the dead band control circuit 4 among Fig. 3 is shown in Fig. 3-1, comprise voltage ratio than logical circuit 41 and drive amplifying circuit 42, this voltage ratio comprises resistance R a than logical circuit 41, Rb, Rc, Rd, voltage comparator A, B and a logical AND gate F, be connected after described resistance R a and the Rb series connection between supply power voltage end Vin and the simulation ground, the tie point of this resistance R a and Rb is connected with the negative input end of voltage comparator B, be used for setting up comparative voltage lower threshold Vtl, be connected after described resistance R c and the Rd series connection between supply power voltage end Vin and the simulation ground, the tie point of this resistance R c and Rd is connected with the positive input terminal of voltage comparator A, be used for setting up comparative voltage threshold values upper limit Vth, the negative input end of described voltage comparator A links to each other with the positive input terminal of voltage comparator B, this tie point is the input Vi of dead band control circuit 4, the output of described voltage comparator A connects the first input end of logical AND gate F, the output of voltage comparator B connects second input of logical AND gate F, the 3rd input of this logical AND gate F is the signals collecting end A of dead band control circuit 4, the level signal of this logical AND gate F output through driving amplifying circuit 42 control auxiliary switch pipes conducting or end.Described driving amplifying circuit 42 comprises triode NPN pipe Q3 and PNP pipe Q4, the output of described logical AND gate F connects the base stage of NPN pipe Q3 and PNP pipe Q4, the collector electrode of NPN pipe Q3 connects supply power voltage end Vin, the collector electrode of PNP pipe Q4 connects simulation ground, NPN pipe Q3 links to each other with the emitter of PNP pipe Q4, and this tie point is the output end vo of dead band control circuit 4
The supply power voltage of supply power voltage end Vin is through Ra, Rb, Rc, the Rd dividing potential drop, a voltage comparison signal is provided for respectively the negative terminal of comparator A and the anode of comparator B, input Vi incoming level signal, pass through logical AND gate F formation logic signal through two level signals that the comparison transformation of two comparators generates with the outputs level signals that drives treatment circuit 2, again through conversion and the amplification of the amplifying circuit 42 of overdriving, the output end vo output drive signal, when signals collecting end A receives low level signal, the driving signal of output end vo output is low level, when signals collecting end A receives high level, the level signal that input Vi receives is at comparative voltage threshold value bound Vth, between the Vtl, the output end vo output drive signal is high level.The different values of resistance R a, Rb, Rc, Rd can change the comparative voltage threshold value bound Vth of dead band control circuit 4, the size of Vtl, make the dead band control of switching tube more flexible.
Master control circuit controls produces PWM driving signal and directly controls main switch, and the present invention exports PWM2 drive auxiliary switch pipe.As shown in Figure 3, when main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage, so rectifier diode D1 ends, simulation ground is high level, give the dead band control circuit 4 power supplies by capacitor C 1, PMOS pipe Q2 conducting simultaneously, then drive treatment circuit 2 output low levels, the signals collecting end A termination of dead band control circuit 4 is received low level signal, capacitor C 2 is by the simulation ground charging of high level and by diode D2 and the Q2 discharge of releasing, the input Vi received signal level of dead band control circuit 4 reduces gradually at this moment, dead band control circuit 4 output low level signals, and the auxiliary switch pipe ends.When main switch turn-offs, tertiary winding N3 voltage is negative for just going up down, rectifier diode D1 conducting, simulation ground is low level, capacitor C 1 charging, be 4 power supplies of dead band control circuit, NMOS pipe Q1 conducting simultaneously, drive treatment circuit 2 output high level, then the signals collecting end A termination of dead band control circuit 4 is received high level signal, and high level signal charges to capacitor C 2 by resistance R 1, the incoming level of dead band control circuit 4 input Vi rises gradually, when rising between comparative threshold voltage upper limit Vth and the lower limit Vtl, control circuit 4 output high level signals in dead band can directly drive the conducting of auxiliary switch pipe.When wherein the charging of capacitor C 2 rises to comparative voltage threshold value lower limit Vtl, upper limit Vth, need certain charging interval, can change corresponding charge constant by changing resistance R 1 and capacitor C 2 parameters, obtain corresponding dead band control signal.
When main switch drives duty ratio hour, it is untimely that the diode D2 that releases in the delay circuit 3 can prevent that capacitor C 2 electric charges from discharging, and overvoltage damaged and the whole isolated drive circuit was lost efficacy.
Embodiment two
As shown in Figure 4, embodiment two uses NPN type triode Q1, positive-negative-positive triode Q2 to replace embodiment illustrated in fig. 3 one NMOS pipe Q1, PMOS pipe Q2 respectively, simultaneously in order to limit the base current of NPN type triode Q1, positive-negative-positive triode Q2, be connected resistance R 2 between the different name end of NPN type triode Q1 and positive-negative-positive triode Q2 ground level tie point and tertiary winding N3, other connected mode and operation principle and Fig. 3 are similar, give unnecessary details no longer one by one at this.
It below only is preferred implementation of the present invention, 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, as dead band of the present invention control circuit being integrated in the integrated device, become dead band control IC; The anti-sharp asymmetrical half-bridge that changes into of active clamp is instead swashed or other relevant topology; Driving treatment circuit and the required operating voltage of dead band control circuit also can be provided by other peripheral circuits in the circuit of reversed excitation.These improvements and modifications also should be considered as protection scope of the present invention, no longer give unnecessary details with embodiment here, and protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (7)
1. the auxiliary switch pipe isolated drive circuit of an active clamp circuit of reversed excitation is characterized in that comprising:
Tertiary winding N3 is located at the main transformer primary side of active clamp circuit of reversed excitation;
Drive treatment circuit, the induced voltage of tertiary winding N3 is imported as it;
Delay circuit is to coming the signal lag of self-driven treatment circuit;
Dead band control circuit, its input Vi input are from the signal of delay circuit, and its signals collecting end A input comes the signal of self-driven treatment circuit, and its output end vo output drives second pwm signal of auxiliary switch pipe;
When main control circuit produces the conducting of first pwm signal control main switch, the voltage of tertiary winding N3 is after driving treatment circuit, for turn-offing logic level signal, deliver to the signals collecting end A of dead band control circuit, make the output end vo output of dead band control circuit control second pwm signal that the auxiliary switch pipe ends, when main control circuit produce first pwm signal control main switch by the time, the induced voltage of tertiary winding N3 is after driving treatment circuit, be the turn-on logic level signal, deliver to the signals collecting end A of dead band control circuit, simultaneously, the level signal of this driving treatment circuit output is delivered to the input Vi of dead band control circuit after the delay circuit time-delay, the level signal that receives as this input Vi is at comparative voltage threshold values bound Vth, in the time of between the Vtl, make second pwm signal of the output end vo output control auxiliary switch pipe conducting of dead band control circuit.
2. auxiliary switch pipe isolated drive circuit according to claim 1, it is characterized in that: also comprise the power supply circuits that drive treatment circuit and the required operating voltage of dead band control circuit be used to providing, the induced voltage of tertiary winding N3 is as the input voltage of described power supply circuits.
3. auxiliary switch pipe isolated drive circuit according to claim 2, it is characterized in that: described power supply circuits comprise rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1, the end of the same name of described tertiary winding N3 connects anode and the simulation ground of voltage-stabiliser tube Z1, the different name end connects the anode of rectifier diode D1, capacitor C 1 and voltage-stabiliser tube Z1 parallel connection, the negative electrode of rectifier diode D1 connects the negative electrode of voltage-stabiliser tube Z1, and this tie point is supply power voltage end Vin; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, and rectifier diode D1 ends, and simulation ground is high level, capacitor C 1 discharge power supply, when main switch turn-offed, it was negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, rectifier diode D1 conducting power supply, simulation ground is low level, capacitor C 1 charging.
4. auxiliary switch pipe isolated drive circuit according to claim 1, it is characterized in that: described driving treatment circuit comprises field effect transistor NMOS pipe Q1 and PMOS pipe Q2, the different name end of described tertiary winding N3 connects the grid of NMOS pipe Q1 and PMOS pipe Q2, the drain electrode of NMOS pipe Q1 connects supply power voltage end Vin, the drain electrode of PMOS pipe Q2 connects simulation ground, NMOS pipe Q1 links to each other with the source electrode of PMOS pipe Q2, and its tie point is for driving the output for the treatment of circuit; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, PMOS pipe Q2 conducting, then drive treatment circuit output low level signal, this low level signal is for turn-offing logic level signal, when main switch turn-offs, it is negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, NMOS pipe Q1 conducting, drive treatment circuit output high level signal, this high level signal is the turn-on logic level signal.
5. auxiliary switch pipe isolated drive circuit according to claim 1, it is characterized in that: described driving treatment circuit comprises triode NPN pipe Q1 and PNP pipe Q2, the different name end of described tertiary winding N3 connects the base stage of NPN pipe Q1 and PNP pipe Q2 through resistance R 2, the collector electrode of NPN pipe Q1 connects supply power voltage end Vin, the collector electrode of PNP pipe Q2 connects simulation ground, NPN pipe Q1 links to each other with the emitter of PNP pipe Q2, and its tie point is for driving the output for the treatment of circuit; When main control circuit produces the conducting of pwm signal control main switch, the former limit of tertiary winding N3 and main transformer winding coupled is isolated, it is last negative just down producing voltage between the end of the same name of this tertiary winding N3 and different name end, PNP pipe Q2 conducting, then drive treatment circuit output low level signal, this low level signal is for turn-offing logic level signal, when main switch turn-offs, it is negative for just going up down to produce voltage between the end of the same name of tertiary winding N3 and different name end, NPN pipe Q1 conducting, drive treatment circuit output high level signal, this high level signal is the turn-on logic level signal.
6. according to claim 4 or 5 described auxiliary switch pipe isolated drive circuits, it is characterized in that: described delay circuit comprises resistance R 1 and capacitor C 2, one end of resistance R 1 connects the output that drives treatment circuit, the other end connects an end of capacitor C 2, another termination simulation ground of this capacitor C 2, the tie point of resistance R 1 and capacitor C 2 is the output of delay circuit; When the main switch conducting, drive treatment circuit output low level signal, capacitor C 2 discharges, the signal voltage of delay circuit output reduces, when main switch turn-offs, drive treatment circuit output high level signal, to capacitor C 2 chargings, the signal voltage of delay circuit output rises this high level signal by resistance R 1.
7. auxiliary switch pipe isolated drive circuit according to claim 6, it is characterized in that: described delay circuit also comprises the diode D2 that releases, the negative electrode of this diode D2 that releases connects the output that drives treatment circuit, and anode connects the tie point of resistance R 1 and capacitor C 2.
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| CN107231006A (en) * | 2016-08-31 | 2017-10-03 | 天佑电器（苏州）有限公司 | Alterating and direct current source control device, toolroom machine and dust catcher with the device |
| CN107800283A (en) * | 2016-09-06 | 2018-03-13 | 快捷半导体有限公司 | The clamp voltage detection of supply of electric power topology and overvoltage protection |
| CN107994634A (en) * | 2017-12-07 | 2018-05-04 | 江苏博强新能源科技股份有限公司 | One kind is based on waveform delay Current limited Control device and its application method |
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| WO2015196858A1 (en) * | 2014-06-24 | 2015-12-30 | 华为技术有限公司 | Circuit of voltage regulator |
| CN107204635A (en) * | 2016-08-31 | 2017-09-26 | 天佑电器（苏州）有限公司 | Alterating and direct current source control device, toolroom machine and dust catcher with the device |
| CN107231006A (en) * | 2016-08-31 | 2017-10-03 | 天佑电器（苏州）有限公司 | Alterating and direct current source control device, toolroom machine and dust catcher with the device |
| CN107204635B (en) * | 2016-08-31 | 2020-08-28 | 天佑电器（苏州）有限公司 | AC/DC power supply control device, tool machine with same and dust collector |
| CN107800283A (en) * | 2016-09-06 | 2018-03-13 | 快捷半导体有限公司 | The clamp voltage detection of supply of electric power topology and overvoltage protection |
| CN107800283B (en) * | 2016-09-06 | 2021-03-12 | 快捷半导体有限公司 | Active clamp flyback controller and power supply system and control method thereof |
| CN107196517A (en) * | 2017-07-04 | 2017-09-22 | 广州金升阳科技有限公司 | The drive circuit and driving method of clamp switch in Switching Power Supply |
| CN107994634A (en) * | 2017-12-07 | 2018-05-04 | 江苏博强新能源科技股份有限公司 | One kind is based on waveform delay Current limited Control device and its application method |
| CN112492722A (en) * | 2019-08-23 | 2021-03-12 | 圣邦微电子（北京）股份有限公司 | LED drive circuit and control circuit thereof |
| CN111725974A (en) * | 2020-06-30 | 2020-09-29 | 西安微电子技术研究所 | Two-path driving signal generating circuit with adjustable dead time |
| CN111725974B (en) * | 2020-06-30 | 2021-10-22 | 西安微电子技术研究所 | Two-path driving signal generating circuit with adjustable dead time |
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