CN111510125B - High-reliability isolation type high-voltage switch circuit - Google Patents
High-reliability isolation type high-voltage switch circuit Download PDFInfo
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- CN111510125B CN111510125B CN202010337418.7A CN202010337418A CN111510125B CN 111510125 B CN111510125 B CN 111510125B CN 202010337418 A CN202010337418 A CN 202010337418A CN 111510125 B CN111510125 B CN 111510125B
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- 238000002955 isolation Methods 0.000 title description 5
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000005286 illumination Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/785—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling field-effect transistor switches
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- Electronic Switches (AREA)
Abstract
The invention discloses a high-reliability isolated high-voltage switch circuit, which is applied to products of high-voltage input and high-voltage output, adopts a small-signal control high-voltage device, has simple structure, safety and reliability, wide application of products, high-voltage defogging, illumination field, heating fan, motor and the like, and the technical scheme is characterized by comprising the following steps: the high-voltage control unit comprises an optocoupler U1 and a bidirectional thyristor control circuit, wherein the bidirectional thyristor control circuit comprises a G electrode connected with a bidirectional thyristor M1 at the controlled side of the optocoupler, the input side of the integrating circuit is connected with a control signal input port P1, the power supply control unit comprises a MOS tube, the G electrode of the MOS tube is connected to the collector electrode of a triode Q1, the D electrode is connected to a power VCC, a resistor R3 is connected between the S electrode and the No. 1 pin of the optocoupler U1, and a resistor R12 is connected between the S electrode and the emitter electrode of the triode Q1.
Description
Technical Field
The invention relates to the technical field of switching circuits, in particular to a high-reliability isolation type high-voltage switching circuit.
Background
At present, all output control signals are basically given to a control unit in the form of single-chip microcomputer output, and the core in the application solves the problem that when the control signals are abnormal or run out, control is invalid, if a load cannot cut off the output in time, serious consequences of the rear end can be caused, property and personnel casualties can be caused, and in order to avoid serious property and personnel casualties, the control circuit for automatically stopping or running out is arranged on a circuit to avoid the situation that the important property and personnel casualties happen.
Disclosure of Invention
Aiming at the defects and defects of the prior art, the isolated high-voltage switch circuit is applied to products from which high voltage is input to a high-voltage output side, adopts a small-signal control high-voltage device, and has the advantages of simple structure, safety, reliability, wide product application, high-voltage defogging, illumination field, heating fan, motor and the like.
In order to achieve the above object, the present invention provides the following technical solutions.
A high reliability isolated high voltage switching circuit comprising:
The high-voltage control unit comprises an optocoupler U1 and a bidirectional thyristor control circuit, wherein the bidirectional thyristor control circuit comprises a bidirectional thyristor M1 with a G electrode connected to the controlled side of the optocoupler U1, the bidirectional thyristors T1 and T2 electrode receive a load control main circuit, when the turning-on of the optocoupler U1 drives the bidirectional thyristor M1 to carry out output, and when the turning-off of the optocoupler U1 drives the bidirectional thyristor M1 to turn off the load;
The power supply control unit comprises a MOS tube, wherein a G electrode of the MOS tube is connected to a collector electrode of the triode Q1, a D electrode of the MOS tube is connected to a power VCC, a resistor R3 is connected between the S electrode and the No. 1 pin of the optocoupler U1, a resistor R12 is connected between the S electrode and an emitter electrode of the triode Q1, and when the input of the port P1 is direct current, the MOS tube is closed;
The pin 2 of the optical coupler U1 is connected with a second signal processing unit, the second signal processing unit comprises a triode Q2, the collector of the triode Q2 is connected with the pin 2 of the optical coupler U1, and the base of the triode Q2 is connected with a control signal input port P2; when the P1 input is high level or low level, the MOS tube is cut off, the thyristor M1 is in an off state, and no output voltage is generated.
After adopting above structure, the high-reliability isolation type high-voltage switch circuit has the following advantages compared with the prior art: as long as the square wave model of normal work is input by the control signal input port P1, the MOS tube can output the power supply voltage of VCC to the optocoupler, and then the optocoupler can normally control the load output of the bidirectional thyristor M1, only when the control signal input port P1 is input at high level or low level, the MOS tube is cut off to a non-conductive state, the thyristor at this time is not affected by the P1 signal, the output is in a disconnected state, and the output is no output voltage, thereby achieving the safety function; the high-voltage power supply is applied to products with high-voltage input and high-voltage output, adopts a small-signal control high-voltage device, has a simple structure, is safe and reliable, and is widely applied to the fields of high-voltage defogging, illumination, heating fans, motors and the like.
As an improvement of the invention, the triode Q1 is connected to the D pole of the MOS transistor through a pull-up resistor R15. The resistor R15 is a pull-up resistor of the triode Q1, and mainly aims to provide a conduction condition for the triode Q1, and the conduction of the MOS tube can be controlled only by the conduction of the triode Q1, so that the voltage operation from the VCC power supply to the resistor R3 and the optocoupler U1 is realized.
As an improvement of the invention, a capacitor C1, a diode D2 and a resistor R2 are sequentially connected between the control signal input port P1 and the base electrode of the triode Q1, the diode D1 is connected between the capacitor C1 and the emitter electrode of the triode Q1, the capacitor C2 and the resistor R1 are sequentially connected in parallel between the diode D2 and the emitter electrode of the triode Q1, and the integrating circuit is composed of the capacitor C1, the capacitor C2 and the resistor R1. The capacitor C2 is temporarily charged by using the square wave high level input by the control signal input port P1 and is converted into direct current, the capacitor C2 is full at the stage at the moment, the forward current is rapidly increased after the forward voltage of the diode D2 is larger than the dead zone voltage due to the working characteristic of the diode D2, the forward resistance of the diode becomes small, and the diode is forward conducted.
As an improvement of the invention, a resistor R4 is connected between the control signal input port P2 and the triode Q2, and a resistor R5 is connected between the base electrode and the emitter electrode of the triode Q2.
As an improvement of the invention, a resistor R8 is connected between the G pole and the T1 pole of the bidirectional triode thyristor M1, the G pole of the bidirectional triode thyristor M1 is connected to the No. 4 pin of the optocoupler U1, the No. 6 pin of the optocoupler U1 is connected to the T2 pin of the bidirectional triode thyristor M1, a resistor R6 and a resistor R7 are sequentially connected between the No. 6 pin of the optocoupler U1 and the T2 pin of the bidirectional triode thyristor M1, and the T1 pin of the bidirectional triode thyristor M1 is connected to one end of the resistor R6 through a capacitor C3.
As an improvement of the invention, the main circuit further comprises a current input port, wherein the main circuit comprises an L2 end connected with one side of the resistor R7 and the controlled load, an L1 end connected with the current input port and an N end connected with the other side of the controlled load, and the other side of the load is connected with the current input port.
Drawings
Fig. 1 is a schematic diagram of a power supply circuit of the present invention.
Fig. 2 is a schematic block diagram of the circuit of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
Referring to fig. 1-2, a high-voltage switch circuit with high reliability and isolation according to the present invention includes:
The high-voltage control unit comprises an optocoupler U1 and a bidirectional thyristor control circuit, wherein the bidirectional thyristor control circuit comprises a bidirectional thyristor M1 with a G electrode connected to the controlled side of the optocoupler U1, the bidirectional thyristors T1 and T2 electrode receive a load control main circuit, when the turning-on of the optocoupler U1 drives the bidirectional thyristor M1 to carry out output, and when the turning-off of the optocoupler U1 drives the bidirectional thyristor M1 to turn off the load;
The power supply control unit comprises a MOS tube, wherein a G electrode of the MOS tube is connected to a collector electrode of the triode Q1, a D electrode of the MOS tube is connected to a power VCC, a resistor R3 is connected between the S electrode and the No. 1 pin of the optocoupler U1, a resistor R12 is connected between the S electrode and an emitter electrode of the triode Q1, and when the input of the port P1 is direct current, the MOS tube is closed;
The pin 2 of the optical coupler U1 is connected with a second signal processing unit, the second signal processing unit comprises a triode Q2, the collector of the triode Q2 is connected with the pin 2 of the optical coupler U1, and the base of the triode Q2 is connected with a control signal input port P2; when the P1 input is high level or low level, the MOS tube is cut off, the thyristor M1 is in an off state, and no output voltage is generated.
The triode Q1 is connected to the D pole of the MOS tube through a pull-up resistor R15.
The control signal input port P1 is connected with a capacitor C1, a diode D2 and a resistor R2 in sequence between the base electrode of the triode Q1, the diode D1 is connected between the capacitor C1 and the emitter electrode of the triode Q1, the capacitor C2 and the resistor R1 are connected between the diode D2 and the emitter electrode of the triode Q1 in sequence in parallel, and the integrating circuit consists of the capacitor C1, the capacitor C2 and the resistor R1.
A resistor R4 is connected between the control signal input port P2 and the triode Q2, and a resistor R5 is connected between the base and the emitter of the triode Q2.
The resistor R8 is connected between the G pole and the T1 pole of the bidirectional triode thyristor M1, the G pole of the bidirectional triode thyristor M1 is connected to the No. 4 pin of the optocoupler U1, the No. 6 pin of the optocoupler U1 is connected to the T2 pin of the bidirectional triode thyristor M1, the resistor R6 and the resistor R7 are sequentially connected between the No. 6 pin of the optocoupler U1 and the T2 pin of the bidirectional triode thyristor M1, and the T1 pin of the triode thyristor M1 is connected to one end of the resistor R6 through a capacitor C3.
The main circuit also comprises a current input port, wherein the main circuit comprises an L2 end connected with one side of the resistor R7 and the controlled load, an L1 end connected with the current input port and an N end connected with the other side of the controlled load, and the other side of the load is connected with the current input port.
Working principle: diode D1 is a reflow diode, diode D2 is a reverse current reflow diode, resistor R7, resistor R8, resistor R6, resistor R2, resistor R15 is a configuration resistor, and capacitor C3 is a voltage spike absorption capacitor. When the output of the control signal input port P1 is normal, the control signal input port P1 at this time is of a square wave type with a certain frequency, when the capacitor C2 passes through, the resistor C2 is temporarily charged by using a square wave high level and is converted into direct current, the capacitor C2 is full at this stage, and due to the working characteristic of the diode D2, after the forward voltage of the diode D2 is greater than the dead zone voltage, the forward current rapidly increases, the forward resistance of the diode D2 becomes very small, and the diode D2 is forward conducted. After conduction, a small increase in forward voltage causes a sharp increase in forward current, and the relationship between voltage and current is approximately linear, which is called a forward conduction region. The diode D2 is mainly used to return the power to the control signal input port P1 when the power cannot be supplied after the charging is completed. The diode D1 plays a role in the circuit as a reflux, since the voltage at two ends of the capacitor C2 needs to increase the reflux if the voltage at two ends of the capacitor C2 is required to reach the expected level, the resistor R15 is a pull-up resistor of the transistor Q1, so that the transistor Q1 is turned on to control the conduction of the MOS transistor in order to provide a conduction condition for the transistor Q1, so as to realize the voltage operation from the power supply VCC to the resistors R3 and U1, and the resistor R2 consumes the energy above the capacitor C2. The resistance or capacitance of the resistor R15, the resistor R12 and the capacitor C2 can be adjusted, and the adjustment of the resistance of the resistor R15 is to reduce the shunt on the resistor R15, so that the charging time of the capacitor C2 in the circuit is faster.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (3)
1. A high-reliability isolated high-voltage switching circuit, which is applied to a product of a high-voltage input and high-voltage output party and controls a high-voltage device by a small signal, comprising:
The high-voltage control unit comprises an optocoupler U1 and a bidirectional thyristor control circuit, wherein the bidirectional thyristor control circuit comprises a bidirectional thyristor M1 with a G electrode connected to the controlled side of the optocoupler U1, the bidirectional thyristors T1 and T2 electrode receive a load control main circuit, when the turning-on of the optocoupler U1 drives the bidirectional thyristor M1 to carry out output, and when the turning-off of the optocoupler U1 drives the bidirectional thyristor M1 to turn off the load;
The power supply control unit comprises a MOS tube, wherein a G electrode of the MOS tube is connected to a collector electrode of the triode Q1, a D electrode of the MOS tube is connected to a power VCC, a resistor R3 is connected between the S electrode and the No. 1 pin of the optocoupler U1, a resistor R12 is connected between the S electrode and an emitter electrode of the triode Q1, and when the input of the port P1 is direct current, the MOS tube is closed;
The pin 2 of the optical coupler U1 is connected with a second signal processing unit, the second signal processing unit comprises a triode Q2, the collector of the triode Q2 is connected with the pin 2 of the optical coupler U1, and the base of the triode Q2 is connected with a control signal input port P2; when the P1 input is high level or low level, the MOS tube is in an cut-off state, and the silicon controlled rectifier M1 is in a cut-off state, so that no output voltage is generated;
the triode Q1 is connected to the D pole of the MOS tube through a pull-up resistor R15;
A capacitor C1, a diode D2 and a resistor R2 are sequentially connected between the control signal input port P1 and the base electrode of the triode Q1, the diode D1 is connected between the capacitor C1 and the emitter electrode of the triode Q1, the capacitor C2 and the resistor R1 are sequentially connected between the diode D2 and the emitter electrode of the triode Q1 in parallel, and the integrating circuit consists of the capacitor C1, the capacitor C2 and the resistor R1;
A resistor R4 is connected between the control signal input port P2 and the triode Q2, and a resistor R5 is connected between the base electrode and the emitter electrode of the triode Q2;
When the control signal input port P1 inputs a square wave model which normally works, the MOS tube outputs the power supply voltage of VCC to the optocoupler, and then the optocoupler works normally to control the load output of the bidirectional thyristor M1, when the control signal input port P1 inputs a high level or a low level, the MOS tube is in a non-conducting state, the thyristor is not influenced by a P1 signal, the output is in a disconnection state, and the output is free of output voltage, so that the safety effect is achieved;
By adjusting the resistance or capacitance of the resistor R15, the resistor R12 and the capacitor C2, the resistance of the resistor R15 is adjusted to reduce the shunt on the resistor R15, so that the charging time of the capacitor C2 in the circuit is faster, and the resistor R12 plays a very important role in the circuit, so that when the control signal input port P1 is input into the direct current, the energy on the capacitor C2 is consumed through the resistor R12, and the MOS transistor is turned off.
2. The high-reliability isolated high-voltage switching circuit of claim 1, wherein: the resistor R8 is connected between the G pole and the T1 pole of the bidirectional triode thyristor M1, the G pole of the bidirectional triode thyristor M1 is connected to the No. 4 pin of the optocoupler U1, the No. 6 pin of the optocoupler U1 is connected to the T2 pin of the bidirectional triode thyristor M1, the resistor R6 and the resistor R7 are sequentially connected between the No. 6 pin of the optocoupler U1 and the T2 pin of the bidirectional triode thyristor M1, and the T1 pin of the triode thyristor M1 is connected to one end of the resistor R6 through a capacitor C3.
3. The high-reliability isolated high-voltage switching circuit of claim 1, wherein: the main circuit also comprises a current input port, wherein the main circuit comprises an L2 end connected with one side of the resistor R7 and the controlled load, an L1 end connected with the current input port and an N end connected with the other side of the controlled load, and the other side of the load is connected with the current input port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010337418.7A CN111510125B (en) | 2020-04-26 | 2020-04-26 | High-reliability isolation type high-voltage switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010337418.7A CN111510125B (en) | 2020-04-26 | 2020-04-26 | High-reliability isolation type high-voltage switch circuit |
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| CN111510125A CN111510125A (en) | 2020-08-07 |
| CN111510125B true CN111510125B (en) | 2024-07-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997477A (en) * | 2009-08-17 | 2011-03-30 | 樱花卫厨（中国）股份有限公司 | PWM pulse regulating circuit for motor of range hood |
| CN110750066A (en) * | 2019-11-03 | 2020-02-04 | 苏州时智电子科技有限公司 | Novel alternating current driving output circuit of grating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333363B (en) * | 2013-07-22 | 2017-08-01 | 广东美的环境电器制造有限公司 | The triggers circuit of bidirectional triode thyristor and the load control circuit with it and fan |
| CN104347313A (en) * | 2013-08-08 | 2015-02-11 | 江苏西德电梯有限公司 | Realization method of relay driving module applied to elevator control system |
| CN106300247A (en) * | 2015-06-05 | 2017-01-04 | 中兴通讯股份有限公司 | Voltage protection circuit and system |
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2020
- 2020-04-26 CN CN202010337418.7A patent/CN111510125B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997477A (en) * | 2009-08-17 | 2011-03-30 | 樱花卫厨（中国）股份有限公司 | PWM pulse regulating circuit for motor of range hood |
| CN110750066A (en) * | 2019-11-03 | 2020-02-04 | 苏州时智电子科技有限公司 | Novel alternating current driving output circuit of grating |
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| CN111510125A (en) | 2020-08-07 |
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