CN203377788U - Auxiliary switch tube isolated driving circuit of active clamp flyback circuit - Google Patents
Auxiliary switch tube isolated driving circuit of active clamp flyback circuit Download PDFInfo
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- CN203377788U CN203377788U CN201320413527.8U CN201320413527U CN203377788U CN 203377788 U CN203377788 U CN 203377788U CN 201320413527 U CN201320413527 U CN 201320413527U CN 203377788 U CN203377788 U CN 203377788U
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Abstract
The utility model provides an auxiliary switch tube isolated driving circuit of an active clamp flyback circuit. The auxiliary switch tube isolated driving circuit comprises a third winder arranged at the secondary side of an active clamp flyback circuit main transformer, a driving processing circuit, a delay circuit and a dead zone control circuit. When a main control circuit generates a PWM signal to control the main switch tube to be conducted, after the voltage of the third winding passes through the driving processing circuit, a shutdown logic level signal is sent to the signal acquisition end of the dead zone control circuit such that the output end of the dead zone control circuit outputs a PWM2 signal which controls the shutdown of an auxiliary switch tube. When a main switch tube is shut down, after the voltage of the third winding passes through the driving processing circuit, a conduction logic level signal is sent to the signal acquisition end of the dead zone control circuit, at the same time, the signal is sent to the input end of the dead zone control circuit through the delay circuit, and when the level signal of the input end is between the upper limit and the lower limit of a comparison voltage threshold, the output end of the dead zone control circuit outputs a PWM2 signal which controls the conduction of the auxiliary switch tube. The auxiliary switch tube isolated driving circuit has the advantages of simplicity, cost saving and size saving.
Description
Technical field
The utility model 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, due to switching tube not altogether, usually need to adopt isolation drive to realize the control of switching tube.Be illustrated in figure 1 active clamp circuit of reversed excitation theory diagram commonly used, power stage and main control loop form traditional flyback part, and auxiliary switch pipe and capacitor C form the active clamp part, and the pwm signal that main control circuit produces circuit of reversed excitation drives each switching tube work.Due to the main switch source ground, the floating ground of auxiliary switch pipe source electrode, therefore drive the signal demand isolation of auxiliary switch pipe, simultaneously in order to prevent that the conducting simultaneously of auxiliary switch pipe and main switch from destroying the course of work of traditional flyback, drives the driving signal of two switching tubes also to need to carry out dead band control.Be illustrated in figure 2 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 the integration and differentiation circuit produces the different signal of two-way sequential, and output is as the input signal of dead band control circuit.Dead band control circuit feeder ear Vin is the winding power supply in main control loop, its cut-away view is as 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 to the negative terminal of comparator A and the anode of comparator B, two-way input signal Vi1, Vi2 carry out the signal conversion through two comparators and two driving amplifiers respectively and amplify after output voltage signal, 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 form a road driving amplifier, and the signal demand obtained after relatively through comparator, through driving amplifier, improves driving force.
When the pwm signal input is arranged, signal produces the different signal of two-way sequential through the integration and differentiation circuit, and as the input signal of dead band control circuit, after the dead band control circuit is processed, the two-way formed with dead band drives signal.Because of this two paths of signals in IC inside altogether, so a road signal must could be worked by the driving switch pipe through isolation, signal isolation circuit as shown in Figure 2, the PWM1 signal can directly not drive the main switch on common ground through isolation, signal PWM2 through isolation processing drives not the auxiliary switch pipe on ground altogether, and the pwm signal that can also produce by main control circuit in addition drives main switch work.
Isolated drive circuit circuit shown in Fig. 2 is simple, during stable state, drive signal PWM2 amplitude not to be subject to the impact of duty ratio, but in the situation that change in duty cycle is larger, capacitor C 4 electric charges can't discharge immediately, easily cause the false triggering of auxiliary switch pipe, extra electric charge Releasing loop need to be set usually, the circuit very complex that becomes, and reliability is not high.Electric discharge metal-oxide-semiconductor Q and auxiliary winding that between the output PWM2 of Fig. 2 circuit and ground, to be connected as patent publication No. be CN101621246, form the discharge loop of capacitor C 4, but the winding both end voltage of former secondary disappears at once when the transformer primary side winding enters saturation condition because of original edge voltage, switching tube can turn-off immediately, now will lose the discharging function to C4 electric capacity, and also can exist and drive not enough risk than hour tertiary winding in duty ratio.Between the PWM of Fig. 2 circuit and PWM2, be connected as patent publication No. be that discharge circuit is turn-offed in acceleration in CN102307003, control and discharge capacitor C 4 electric charge switching tubes, this circuit has solved the not enough problem of the smaller driving of duty, 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 the 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 what the dead band control circuit generated drives and need suitably to adjust with dead band control time two-way, debug difficulties, and when parameter, that the efficiency that can affect circuit is set when unreasonable is even abnormal.
The utility model content
The purpose of this utility model just is to provide a kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation, simple and cost-saving, saves volume.
For achieving the above object, the utility model proposes a kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation, comprising:
Tertiary winding N3, be 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 inputted as it;
Delay circuit, to carrying out the signal lag of self-driven treatment circuit;
The dead band control circuit, its input Vi input is from the signal of delay circuit, and its signals collecting end A input carrys out the signal of self-driven treatment circuit, and its output end vo output drives the second pwm signal of auxiliary switch pipe;
When main control circuit produces the first pwm signal control main switch conducting, 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 the second pwm signal that the auxiliary switch pipe ends, when main control circuit produces the first pwm signal control main switch cut-off, the induced voltage of tertiary winding N3 is after driving treatment circuit, for 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 received as this input Vi is at comparative voltage threshold values bound Vth, in the time of between Vtl, make the 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 for 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 Same Name of Ends of described tertiary winding N3 connects the anode of voltage-stabiliser tube Z1 and in analog, 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, and rectifier diode D1 cut-off, be high level in analog, capacitor C 1 electric discharge power supply, when main switch turn-offs, it is lower just upper negative producing voltage between the Same Name of Ends of tertiary winding N3 and different name end, rectifier diode D1 conducting power supply, be low level in analog, capacitor C 1 charging.Certainly, drive 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 described in the utility model 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 connecting analog ground of PMOS pipe Q2, NMOS pipe Q1 is connected 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, PMOS pipe Q2 conducting, 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 lower just upper negative producing voltage between the Same Name of Ends 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 described in the utility model 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 connecting analog ground of PNP pipe Q2, NPN pipe Q1 is connected 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, PNP pipe Q2 conducting, 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 lower just upper negative producing voltage between the Same Name of Ends 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.
Visible, 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 described in the utility model 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 of this capacitor C 2 in analog, the output that the tie point of resistance R 1 and capacitor C 2 is delay circuit; When the main switch conducting, drive treatment circuit output low level signal, capacitor C 2 electric discharges, the signal voltage of delay circuit output reduces, when main switch turn-offs, drive treatment circuit output high level signal, this high level signal is by resistance R 1 to capacitor C 2 chargings, and the signal voltage of delay circuit output rises.In order to solve the problem that in the underloading situation, capacitor discharge not exclusively, 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, the tie point of anodic bonding resistance R 1 and capacitor C 2.
Compared with prior art, the utility model meets when realizing isolation drive at the same time, also has advantages of following outstanding:
1, by being set, the tertiary winding realizes main switch and auxiliary switch electrical isolation, can save the elements such as isolating transformer and capacitance, solving traditional isolated drive circuit needs the problem of extra auxiliary circuit electric discharge in the duty ratio sudden change, circuit is simple, volume reduces, cost;
2, the voltage signal of auxiliary switch after driving and taking from the tertiary winding, power supply circuits, driving treatment circuit, delay circuit, dead band control circuit and process, amplitude is not affected by the duty ratio size, does not have the not enough problem that drives;
3, tertiary winding design easily, without considering 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 the time delay adjustment according to elements such as isolating transformer, electric capacity simultaneously, has and debugs conveniently, controls the characteristics such as accurate.
The accompanying drawing explanation
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 prior art;
The cut-away view of the dead band control circuit that Fig. 2-1 is Fig. 2;
Fig. 3 is the utility model embodiment mono-schematic diagram;
The circuit structure diagram of the dead band control circuit that Fig. 3-1 is Fig. 3;
Fig. 4 is the utility model embodiment bis-schematic diagrams;
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described in detail.
Embodiment mono-
As shown in Figure 3, the utility model embodiment mono-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 Same Name of Ends of described tertiary winding N3 connects the anode of voltage-stabiliser tube Z1 and in analog, 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 to 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 connecting analog ground of PMOS pipe Q2, NMOS pipe Q1 is connected 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 of this capacitor C 2 in analog, the output that the tie point of resistance R 1 and capacitor C 2 is 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 carrys out 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 in Fig. 3 is as shown in Fig. 3-1, comprise that voltage ratio is than logical circuit 41 and drive amplification 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, after described resistance R a and Rb series connection, be connected to supply power voltage end Vin and in analog between, the tie point of this resistance R a and Rb is connected with the negative input end of voltage comparator B, for setting up comparative voltage lower threshold Vtl, after described resistance R c and Rd series connection, be connected to supply power voltage end Vin and in analog between, 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 is connected with the positive input terminal of voltage comparator B, the input Vi that this tie point is 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 the second input of logical AND gate F, the signals collecting end A that the 3rd input of this logical AND gate F is dead band control circuit 4, the level signal of this logical AND gate F output is controlled conducting or the cut-off of auxiliary switch pipe through drive amplification circuit 42.Described drive amplification 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 connecting analog ground of PNP pipe Q4, NPN pipe Q3 is connected with the emitter of PNP pipe Q4, the output end vo that this tie point is 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 to respectively the negative terminal of comparator A and the anode of comparator B, input Vi incoming level signal, two level signals that generate through the comparison transformation of two comparators are passed through logical AND gate F formation logic signal together with the outputs level signals that drives treatment circuit 2, pass through again conversion and the amplification of drive amplification circuit 42, 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 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 of switching tube control more flexible.
Master control circuit controls produces PWM and drives signal directly to control main switch, the utility model output PWM2 drive auxiliary switch pipe.As shown in Figure 3, when main control circuit produces the conducting of pwm signal control main switch, the winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage, so rectifier diode D1 cut-off, be high level in analog, by capacitor C 1, give the dead band control circuit 4 power supplies, PMOS pipe Q2 conducting simultaneously, 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 charging in analog of high level and by diode D2 and the Q2 electric discharge of releasing, now the input Vi received signal level of dead band control circuit 4 reduces gradually, dead band control circuit 4 output low level signals, the cut-off of auxiliary switch pipe.When main switch turn-offs, tertiary winding N3 voltage is lower just upper negative, rectifier diode D1 conducting, be low level in analog, capacitor C 1 charging, for 4 power supplies of dead band control circuit, NMOS pipe Q1 conducting simultaneously, drive treatment circuit 2 output high level, 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 lower limit Vtl, dead band control circuit 4 output high level signals, 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, by changing resistance R 1 and capacitor C 2 parameters, can change corresponding charge constant, obtain corresponding dead band control signal.
When main switch drives duty ratio hour, the diode D2 that releases in delay circuit 3 can prevent that capacitor C 2 electric charges from discharging not in time, overvoltage is damaged and whole isolated drive circuit was lost efficacy.
Embodiment bis-
As shown in Figure 4, embodiment bis-is used respectively NPN type triode Q1, positive-negative-positive triode Q2 to replace embodiment illustrated in fig. 3 one NMOS pipe Q1, PMOS pipe Q2, simultaneously in order to limit the base current of NPN type triode Q1, positive-negative-positive triode Q2, contact resistance R2 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, and this is no longer going to repeat them.
It is only below preferred implementation of the present utility model, it should be noted that, above-mentioned preferred implementation should not be considered as restriction of the present utility model, for those skilled in the art, within not breaking away from spirit and scope of the present utility model, can also make some improvements and modifications, as dead band of the present utility model control circuit is integrated in an integrated device, become dead band and control IC; Change the active clamp flyback into asymmetrical half-bridge flyback or other relevant topology; Drive treatment circuit and the required operating voltage of dead band control circuit also can to provide by other peripheral circuits in circuit of reversed excitation.These improvements and modifications also should be considered as protection range of the present utility model, no longer with embodiment, repeat here, and protection range of the present utility model should be as the criterion with the claim limited range.
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, be 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 inputted as it;
Delay circuit, to carrying out the signal lag of self-driven treatment circuit;
The dead band control circuit, its input Vi input is from the signal of delay circuit, and its signals collecting end A input carrys out the signal of self-driven treatment circuit, and its output end vo output drives the second pwm signal of auxiliary switch pipe;
When main control circuit produces the first pwm signal control main switch conducting, 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 the second pwm signal that the auxiliary switch pipe ends, when main control circuit produces the first pwm signal control main switch cut-off, the induced voltage of tertiary winding N3 is after driving treatment circuit, for 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 received as this input Vi is at comparative voltage threshold values bound Vth, in the time of between Vtl, make the 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 for 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 Same Name of Ends of described tertiary winding N3 connects the anode of voltage-stabiliser tube Z1 and in analog, 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, and rectifier diode D1 cut-off, be high level in analog, capacitor C 1 electric discharge power supply, when main switch turn-offs, it is lower just upper negative producing voltage between the Same Name of Ends of tertiary winding N3 and different name end, rectifier diode D1 conducting power supply, be low level in analog, 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 connecting analog ground of PMOS pipe Q2, NMOS pipe Q1 is connected 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, PMOS pipe Q2 conducting, 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 lower just upper negative producing voltage between the Same Name of Ends 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 connecting analog ground of PNP pipe Q2, NPN pipe Q1 is connected 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 winding coupled isolation of the former limit of tertiary winding N3 and main transformer, it is upper just lower negative producing voltage between the Same Name of Ends of this tertiary winding N3 and different name end, PNP pipe Q2 conducting, 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 lower just upper negative producing voltage between the Same Name of Ends 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 the described auxiliary switch pipe of claim 4 or 5 isolated drive circuit, 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 of this capacitor C 2 in analog, the output that the tie point of resistance R 1 and capacitor C 2 is delay circuit; When the main switch conducting, drive treatment circuit output low level signal, capacitor C 2 electric discharges, the signal voltage of delay circuit output reduces, when main switch turn-offs, drive treatment circuit output high level signal, this high level signal is by resistance R 1 to capacitor C 2 chargings, and the signal voltage of delay circuit output rises.
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, the tie point of anodic bonding resistance R 1 and capacitor C 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320413527.8U CN203377788U (en) | 2013-07-11 | 2013-07-11 | Auxiliary switch tube isolated driving circuit of active clamp flyback circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320413527.8U CN203377788U (en) | 2013-07-11 | 2013-07-11 | Auxiliary switch tube isolated driving circuit of active clamp flyback circuit |
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| CN203377788U true CN203377788U (en) | 2014-01-01 |
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| CN201320413527.8U Withdrawn - After Issue CN203377788U (en) | 2013-07-11 | 2013-07-11 | Auxiliary switch tube isolated driving circuit of active clamp flyback circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103346678A (en) * | 2013-07-11 | 2013-10-09 | 广州金升阳科技有限公司 | Auxiliary switching tube isolating driver circuit of active clamping flyback circuit |
| CN107248810A (en) * | 2017-07-10 | 2017-10-13 | 马丽娟 | A kind of high-side switch drive circuit |
| CN108258913A (en) * | 2018-03-08 | 2018-07-06 | 重庆菲力斯特科技有限公司 | The high voltage power supply of quick response |
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| CN115378277A (en) * | 2022-09-13 | 2022-11-22 | 无锡明芯微电子有限公司 | Integrated circuit providing isolated power supply and having low-voltage side high-frequency drive |
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- 2013-07-11 CN CN201320413527.8U patent/CN203377788U/en not_active Withdrawn - After Issue
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| CN103346678A (en) * | 2013-07-11 | 2013-10-09 | 广州金升阳科技有限公司 | Auxiliary switching tube isolating driver circuit of active clamping flyback circuit |
| CN103346678B (en) * | 2013-07-11 | 2015-09-23 | 广州金升阳科技有限公司 | A kind of auxiliary switch pipe isolated drive circuit of active clamp circuit of reversed excitation |
| CN107248810A (en) * | 2017-07-10 | 2017-10-13 | 马丽娟 | A kind of high-side switch drive circuit |
| CN108258913A (en) * | 2018-03-08 | 2018-07-06 | 重庆菲力斯特科技有限公司 | The high voltage power supply of quick response |
| CN108258913B (en) * | 2018-03-08 | 2024-05-24 | 重庆禾维科技有限公司 | High-voltage power supply with fast response |
| WO2019174380A1 (en) * | 2018-03-15 | 2019-09-19 | 广州金升阳科技有限公司 | Time width detection circuit and control method therefor |
| CN109274404A (en) * | 2018-11-16 | 2019-01-25 | 苏州中储普华电力科技有限公司 | LED module signal sending circuit based on power carrier route |
| CN109274404B (en) * | 2018-11-16 | 2023-08-22 | 苏州中储普华电力科技有限公司 | LED module signal transmitting circuit based on power line |
| CN114337301B (en) * | 2021-12-30 | 2023-09-26 | 湖北三江航天红峰控制有限公司 | Time sequence power distribution control circuit |
| CN115378277A (en) * | 2022-09-13 | 2022-11-22 | 无锡明芯微电子有限公司 | Integrated circuit providing isolated power supply and having low-voltage side high-frequency drive |
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Granted publication date: 20140101 Effective date of abandoning: 20150923 |
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