CN205265646U - Breaking of contact is forced to close by clamper tube - Google Patents
Breaking of contact is forced to close by clamper tube Download PDFInfo
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- CN205265646U CN205265646U CN201521104899.8U CN201521104899U CN205265646U CN 205265646 U CN205265646 U CN 205265646U CN 201521104899 U CN201521104899 U CN 201521104899U CN 205265646 U CN205265646 U CN 205265646U
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Abstract
The utility model relates to a breaking of contact is forced to close by clamper tube relates to the switching power supply field, and the technical problem of solution is: eliminate and use the self -driven synchronous rectification circuit who just swashs active clamp in the vibration of closing machine -hour output voltage. The technical scheme who mainly takes does: include: voltage follower circuit, voltage comparison circuit and drive signal generating circuit, voltage follower circuit gathers the voltage signal of PWM controller a soft start control end, and voltage comparison circuit converts voltage follower circuit's output voltage into high -low level, and drive signal generating circuit is given in the transmission to turn -off the clamper tube, the utility model discloses can close machine -hour at the power, utilize PWM controller a soft start control terminal voltage at first to descend, control drive signal generating circuit output voltage -to -ground and rise and then make the clamper tube grid voltage rise, and then turn -off the clamper tube, realize closing at power module and machine -hour can in time turn -off the clamper tube to can eliminate self -driven synchronous rectification circuit in the vibration of closing machine -hour output voltage.
Description
Technical field
The utility model relates to field of switch power, particularly relates to a kind of clamper tube and is forced shutdown circuit.
Background technology
Along with the develop rapidly of data service in recent years and the continuous popularization of distributed power supply system, Switching Power Supply is widely used in the communications fields such as switching equipment, access device, mobile communication, microwave communication and light transmission, router.
In Switching Power Supply, use the secondary self-device synchronous rectification circuit of active normal shock clamp, its output is with large electric capacity, in the time that power module shuts down, because transformer secondary rectifying tube can mutual conduction vibrate the large electric capacity of output, because the clamper tube in circuit can not turn-off in time, transformer primary side capacitor resonance, this electric capacity is exactly the clamping capacitance of clamper tube. The interaction of transformer primary secondary can cause the vibration of modular power source output voltage to drop to zero, and this situation can cause the misoperation of rear class equipment.
Utility model content
Main purpose of the present utility model is, provide a kind of clamper tube of new structure to be forced shutdown circuit, technical problem to be solved is to eliminate the vibration of the self-device synchronous rectification circuit output voltage in the time of shutdown that uses normal shock active-clamp, thereby is more suitable for practicality.
The purpose of this utility model and solve its technical problem and realize by the following technical solutions. Be forced shutdown circuit according to a kind of clamper tube the utility model proposes, it comprises:
Voltage follower circuit, voltage comparator circuit and driving signal generating circuit;
Described voltage follower circuit is used for gathering PWM controller soft and starts control end voltage signal, and by isolated to described PWM controller soft startup control end voltage and late-class circuit, described voltage follower circuit input connects described PWM controller soft and starts control end;
Described voltage comparator circuit input is connected with described voltage follower circuit output, described voltage comparator circuit output connects the input of described driving signal generating circuit, described voltage comparator circuit, for the voltage signal of described voltage follower circuit output is converted to low and high level, is transferred to described driving signal generating circuit;
The output of described driving signal generating circuit connects the grid of clamper tube, for driving clamper tube to turn-off.
The purpose of this utility model and solve its technical problem and also can be applied to the following technical measures to achieve further.
Preferably, aforesaid clamper tube is forced shutdown circuit, wherein said voltage follower circuit comprises the first operational amplifier, the in-phase input end of described the first operational amplifier starts control end with PWM controller soft and is connected, and the inverting input of described the first operational amplifier connects the output of described the first operational amplifier.
Preferably, aforesaid clamper tube is forced shutdown circuit, wherein said voltage comparator circuit comprises the second operational amplifier, the first diode, the first resistance and the first electric capacity, the in-phase input end of described the second operational amplifier is connected in the output of described the first operational amplifier, the inverting input of described the second operational amplifier is connected in the inverting input of described the first operational amplifier by the first diode, the positive pole of described the first diode is connected in the inverting input of described the first operational amplifier, the negative pole of described the first diode connects the inverting input of described the second operational amplifier, the inverting input of described the second operational amplifier is connected with the first resistance with described the first diodes in parallel, and first electric capacity in parallel with described the first resistance, described the first electric capacity is connected with described the first resistance eutral grounding.
Preferably, aforesaid clamper tube is forced shutdown circuit, and the first wherein said operational amplifier and described the second operational amplifier are universal dual operational amplifier;
Described the first operational amplifier and described the second operational amplifier are powered by power supply.
Preferably, aforesaid clamper tube is forced shutdown circuit, wherein said driving signal generating circuit comprises the first metal-oxide-semiconductor, the second diode, the second resistance and the second electric capacity, the grid of described the first metal-oxide-semiconductor connects the output of described the second operational amplifier, the source electrode of described the first metal-oxide-semiconductor connects the second diode cathode, described the second diode cathode connects power supply, the first end of the second resistance and the second Capacitance parallel connection is connected in the drain electrode of described the first metal-oxide-semiconductor, and the second resistance is connected with clamper tube grid with the second end of the second Capacitance parallel connection.
Preferably, aforesaid clamper tube is forced shutdown circuit, and the first wherein said metal-oxide-semiconductor is P channel MOS tube.
Preferably, aforesaid clamper tube is forced shutdown circuit, and wherein said clamper tube is P channel MOS tube.
By technique scheme, the utility model clamper tube is forced shutdown circuit and at least has following advantages:
In the technical scheme that the utility model provides, voltage follower circuit input starts control end with PWM controller soft and is connected, the input of voltage comparator circuit is connected with voltage follower circuit output, and voltage comparator circuit input is connected with first electric capacity in parallel with described voltage follower circuit, drive the input of signal generating circuit to be connected with voltage comparator circuit output, drive the output of signal generating circuit to be connected with clamper tube grid. in prior art, in the time that power module shuts down, because the clamper tube in circuit can not turn-off in time, transformer primary secondary electric capacity is interacted, thereby make output voltage concussion, the utility model has increased control circuit between clamper tube and PWM controller soft startup control end, wherein, the voltage signal that PWM controller soft is started control end by voltage follower circuit is transferred to voltage comparator circuit, voltage comparator circuit output can start control end voltage change according to PWM controller soft and export high ground level, the output of voltage comparator circuit connects driving signal generating circuit, in the time that power module shuts down, PWM controller soft starts control end voltage and first declines, voltage comparator circuit can be exported high level, and then control drives signal generating circuit output voltage-to-ground to raise, and then clamper tube grid voltage is raise, clamper tube is turned off, realize in the time that power module shuts down and can turn-off in time clamper tube, thereby can eliminate the vibration of self-device synchronous rectification circuit output voltage in the time of shutdown,
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of description, below with preferred embodiment of the present utility model and coordinate accompanying drawing to be described in detail as follows.
Brief description of the drawings
Fig. 1 is the circuit connection block diagram that a kind of clamper tube of embodiment proposition of the present utility model is forced shutdown circuit;
Fig. 2 is the circuit connection diagram that a kind of clamper tube of embodiment proposition of the present utility model is forced shutdown circuit.
Detailed description of the invention
Technological means and effect of taking for reaching predetermined utility model object for further setting forth the utility model, below in conjunction with accompanying drawing and preferred embodiment, to being forced shutdown its detailed description of the invention of circuit, structure, feature and effect thereof according to the clamper tube the utility model proposes, be described in detail as follows. In following explanation, the not necessarily same embodiment that different " embodiment " or " embodiment " refer to. In addition, special characteristic, structure or the feature in one or more embodiment can be combined by any suitable form.
As shown in Figure 1, a kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, and it comprises: voltage follower circuit 2, voltage comparator circuit 3, driving signal generating circuit 4. Voltage follower circuit starts the voltage signal of control end 1 for gathering PWM controller soft, and it is isolated with late-class circuit that PWM controller soft is started to control end 1, voltage follower circuit 2 inputs connect PWM controller soft and start control end 1, and voltage follower circuit 2 outputs connect the input of voltage comparator circuit 3; Voltage comparator circuit 3 inputs are connected with voltage follower circuit 2 outputs, voltage comparator circuit 3 outputs connect the input that drives signal generating circuit 4, voltage comparator circuit 3, for the output voltage signal of voltage follower circuit 2 is converted to low and high level, is transferred to and drives signal generating circuit 4; Drive signal generating circuit 4 inputs to connect the output of voltage comparator circuit 3, the output of driving signal generating circuit 4 connects the grid of clamper tube 5, for driving clamper tube 5 to turn-off.
Concrete, voltage follower circuit input starts control end with PWM controller soft and is connected, output is connected with the input of voltage comparator circuit, the effect that voltage follower circuit is here set is that isolation late-class circuit and PWM controller soft start control end, in order to avoid starting control end to PWM controller soft, late-class circuit its voltage pulsation in the time that power module shuts down impacts, thereby PWM controller is caused to damage, in the time that power module normally moves, PWM controller soft starts control end output HIGH voltage, the output of voltage follower circuit can output HIGH voltage, thereby voltage comparator circuit output high level, make to drive signal generating circuit in cut-off state, clamper tube is normally worked, in the time that power module shuts down, first the voltage that PWM controller soft starts control end reduce, and then voltage follower circuit output LOW voltage, voltage comparator circuit output is overturn, output low level, make to drive signal generating circuit in running order, its output voltage-to-ground raises, thereby the grid voltage of the clamper tube being attached thereto is raise, the grid of clamper tube and voltage between source electrodes raise, in the time being less than its unlatching threshold value, clamper tube turn-offs. than prior art, in the time that power module shuts down, because the clamper tube in circuit can not turn-off in time, thereby make output voltage concussion, the utility model can be after power module shutdown, start control end voltage drop by PWM controller soft, be forced shutdown circuit by clamper tube and drive rapidly clamper tube to turn-off, thereby can eliminate the vibration of self-device synchronous rectification circuit output voltage in the time of shutdown.
As shown in Figure 2, a kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, wherein voltage follower circuit comprises the first operational amplifier A, the in-phase input end of the first operational amplifier A starts control end SS with PWM controller soft and is connected, and the inverting input of the first operational amplifier A connects the output of the first operational amplifier A. Here the first operational amplifier A is set to voltage follower, is used for isolating PWM controller soft and starts control end SS and late-class circuit, in order to avoid the voltage that the voltage pulsation of late-class circuit starts control end SS to PWM controller soft impacts, thereby damages PWM controller.
As shown in Figure 2, a kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, voltage comparator circuit comprises the second operational amplifier B, the first diode D1, the first resistance R 1 and the first capacitor C 1, the in-phase input end of the second operational amplifier B is connected in the output of the first operational amplifier A, the inverting input of the second operational amplifier B is connected in the inverting input of the first operational amplifier A by the first diode D1, the positive pole of the first diode D1 is connected in the inverting input of the first operational amplifier A, the negative pole of the first diode D1 connects the inverting input of the second operational amplifier B, the inverting input of the second operational amplifier B is connected with first resistance R 1 in parallel with the first diode D1, and first capacitor C 1 in parallel with the first resistance R 1, the first capacitor C 1 and the first resistance R 1 grounding connection. concrete, in the time that power module normally moves, voltage follower circuit output HIGH voltage, because the in-phase input end of the second operational amplifier B is connected in the output of the first operational amplifier A, the in-phase input end voltage of the second operational amplifier B is higher than its anti-phase input terminal voltage, thereby the output of the second operational amplifier B can be exported high level, in the time that power module shuts down, first the voltage that PWM controller soft starts control end SS reduce, thereby the output end voltage of voltage follower circuit reduces, because the in-phase input end of the second operational amplifier B is connected in the output of the first operational amplifier A, therefore the in-phase input end lower voltage of the second operational amplifier B, due to the reverse-biased cut-off of the first diode D1, when the in-phase input end voltage of the second operational amplifier B is once the forward conduction voltage lower than the first diode D1, the in-phase input end voltage of the second operational amplifier B is lower than the voltage of inverting input, now can trigger the upset of the second operational amplifier B, thereby its output output low level, the first capacitor C 1 is for keeping the anti-phase input terminal voltage of the second operational amplifier B, make the low level of the second operational amplifier B keep the sufficiently long time, at this moment, complete the shutoff to clamper tube, the first resistance R 1 is for discharging to the first capacitor C 1, for shutdown is next time prepared, in the present embodiment, the resistance size of the first resistance R 1 is 10-100 kilo-ohm, the size of the first capacitor C 1 is 10-100 nanofarad.
A kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, and the first operational amplifier A and the second operational amplifier B are universal dual operational amplifier, by same power supply Vcc power supply. The features such as universal dual operational amplifier is that two universal operational amplifiers are integrated on a monolithic, has gain high, and common-mode rejection ratio is high, common mode range is wide, compensation is simple, working stability, and between two amplifiers temperature stability is good.
As shown in Figure 2, a kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, drive signal generating circuit to comprise the first metal-oxide-semiconductor Q5, the second diode C2, the second resistance R 2 and the second capacitor C 2, the grid of the first metal-oxide-semiconductor Q5 connects the output of the second operational amplifier B, the source electrode of the first metal-oxide-semiconductor Q5 connects the second diode D2 negative pole, the anodal power supply Vcc that connects of the second diode D2, the second resistance R 2 first end in parallel with the second capacitor C 2 is connected in the drain electrode of the first metal-oxide-semiconductor Q5, the second resistance R 2 is connected with clamper tube grid with the second end of the second capacitor C 2 parallel connections, concrete, owing to driving the output of signal generating circuit and the input of voltage comparator circuit to be connected, when power module normally moves, voltage comparator circuit output can be exported high level, because the grid of the first metal-oxide-semiconductor Q5 connects the output of the second operational amplifier B, so the grid of the first metal-oxide-semiconductor Q5 is high potential, because the source electrode of the first metal-oxide-semiconductor Q5 connects power supply Vcc by the second diode D2, therefore the voltage difference between grid and the source electrode of the first metal-oxide-semiconductor Q5 is less than its turn-on threshold voltage, therefore the first metal-oxide-semiconductor Q5 is turned off, in the time that power module shuts down, voltage comparator circuit output can output low level, the grid of the first metal-oxide-semiconductor Q5 is electronegative potential, because the source electrode of the first metal-oxide-semiconductor Q5 connects power supply Vcc by the second diode D2, therefore the voltage difference between grid and the source electrode of the first metal-oxide-semiconductor Q5 is greater than its unlatching threshold value, therefore the first metal-oxide-semiconductor Q5 conducting, the second capacitor C 2 is charged by power supply Vcc, the voltage-to-ground of the second capacitor C 2 is raise rapidly, because the second resistance R 2 is connected with clamper tube grid with the second end of the second capacitor C 2 parallel connections, so the grid voltage of clamper tube raises rapidly, the grid of clamper tube and the voltage difference of source electrode raise rapidly, in the time being less than its unlatching threshold value, clamper tube turn-offs, thereby realize in the time that power module shuts down, utilize controller soft to start the feature that first control end SS voltage decline, turn-off in time clamper tube, thereby can eliminate the vibration of self-device synchronous rectification circuit output voltage in the time of shutdown. wherein, the source electrode of the first metal-oxide-semiconductor Q5 connects power supply by the second diode D2, and the second diode D2 is used for isolating power supply VCC and clamper tube is forced shutdown circuit, prevents that clamper tube grid voltage fluctuation meeting from producing and disturbing power supply Vcc. in the utility model embodiment, the size of the second capacitor C 2 is 10-100 nanofarad, and the size of the second resistance R 2 is a kilo-ohm rank.
A kind of clamper tube that an embodiment of the present utility model proposes is forced shutdown circuit, and the first metal-oxide-semiconductor and clamper tube are P channel MOS tube.
The above, it is only preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (7)
1. clamper tube is forced shutdown a circuit, it is characterized in that, it comprises:
Voltage follower circuit, voltage comparator circuit and driving signal generating circuit;
Described voltage follower circuit is used for gathering PWM controller soft and starts control end voltage signal, and by isolated to described PWM controller soft startup control end and late-class circuit, described voltage follower circuit input connects described PWM controller soft and starts control end;
Described voltage comparator circuit input is connected with described voltage follower circuit output, described voltage comparator circuit output connects the input of described driving signal generating circuit, described voltage comparator circuit, for the voltage signal of described voltage follower circuit output is converted to low and high level, is transferred to described driving signal generating circuit;
The output of described driving signal generating circuit connects the grid of clamper tube, for driving described clamper tube to turn-off.
2. clamper tube according to claim 1 is forced shutdown circuit, it is characterized in that,
Described voltage follower circuit comprises the first operational amplifier, and the in-phase input end of described the first operational amplifier starts control end with PWM controller soft and is connected, and the inverting input of described the first operational amplifier connects the output of described the first operational amplifier.
3. clamper tube according to claim 2 is forced shutdown circuit, it is characterized in that,
Described voltage comparator circuit comprises the second operational amplifier, the first diode, the first resistance and the first electric capacity, the in-phase input end of described the second operational amplifier is connected in the output of described the first operational amplifier, the inverting input of described the second operational amplifier is connected in the inverting input of described the first operational amplifier by the first diode, the positive pole of described the first diode is connected in the inverting input of described the first operational amplifier, the negative pole of described the first diode connects the inverting input of described the second operational amplifier, the inverting input of described the second operational amplifier is connected with the first resistance with described the first diodes in parallel, and first electric capacity in parallel with described the first resistance, described the first electric capacity is connected with described the first resistance eutral grounding.
4. clamper tube according to claim 3 is forced shutdown circuit, it is characterized in that,
Described the first operational amplifier and described the second operational amplifier are universal dual operational amplifier;
Described the first operational amplifier and described the second operational amplifier are powered by power supply.
5. clamper tube according to claim 4 is forced shutdown circuit, it is characterized in that,
Described driving signal generating circuit comprises the first metal-oxide-semiconductor, the second diode, the second resistance and the second electric capacity, the grid of described the first metal-oxide-semiconductor connects the output of described the second operational amplifier, the source electrode of described the first metal-oxide-semiconductor connects the second diode cathode, described the second diode cathode connects power supply, the first end of the second resistance and the second Capacitance parallel connection is connected in the drain electrode of described the first metal-oxide-semiconductor, and the second resistance is connected with clamper tube grid with the second end of the second Capacitance parallel connection.
6. clamper tube according to claim 5 is forced shutdown circuit, it is characterized in that,
Described the first metal-oxide-semiconductor is P channel MOS tube.
7. clamper tube according to claim 5 is forced shutdown circuit, it is characterized in that,
Described clamper tube is P channel MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521104899.8U CN205265646U (en) | 2015-12-25 | 2015-12-25 | Breaking of contact is forced to close by clamper tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521104899.8U CN205265646U (en) | 2015-12-25 | 2015-12-25 | Breaking of contact is forced to close by clamper tube |
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| CN205265646U true CN205265646U (en) | 2016-05-25 |
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| CN201521104899.8U Active CN205265646U (en) | 2015-12-25 | 2015-12-25 | Breaking of contact is forced to close by clamper tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114640099A (en) * | 2022-05-19 | 2022-06-17 | 深圳市时代速信科技有限公司 | High-voltage input protection circuit and driving chip |
| WO2022193696A1 (en) * | 2021-03-19 | 2022-09-22 | 苏州贝昂科技有限公司 | Gear control circuit for alternating current motor, system, switch controller, and electronic device |
-
2015
- 2015-12-25 CN CN201521104899.8U patent/CN205265646U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022193696A1 (en) * | 2021-03-19 | 2022-09-22 | 苏州贝昂科技有限公司 | Gear control circuit for alternating current motor, system, switch controller, and electronic device |
| GB2609316A (en) * | 2021-03-19 | 2023-02-01 | Beiang Air Tech Ltd | Gear control circuit for alternating current motor, system, switch controller and electronic device |
| EP4087116A4 (en) * | 2021-03-19 | 2023-11-08 | Beiang Air Tech Ltd. | Gear control circuit for alternating current motor, system, switch controller, and electronic device |
| US12081148B2 (en) | 2021-03-19 | 2024-09-03 | BeiAng Air Tech Ltd. | Gear control circuit and system for alternating current motor, switch controller, and electronic device |
| CN114640099A (en) * | 2022-05-19 | 2022-06-17 | 深圳市时代速信科技有限公司 | High-voltage input protection circuit and driving chip |
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