CN107070440B - Optical coupling isolation type pulse instruction power electronic switch circuit - Google Patents
Optical coupling isolation type pulse instruction power electronic switch circuit Download PDFInfo
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- CN107070440B CN107070440B CN201611189336.2A CN201611189336A CN107070440B CN 107070440 B CN107070440 B CN 107070440B CN 201611189336 A CN201611189336 A CN 201611189336A CN 107070440 B CN107070440 B CN 107070440B
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- circuit
- operational amplifier
- optical coupling
- resistor
- instruction
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
- H03K17/223—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in field-effect transistor switches
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- 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
Abstract
The invention discloses an optical coupling isolation type pulse instruction power electronic switch circuit which is composed of an optical coupling circuit, an operational amplifier circuit and a surge current suppression circuit. The input end of the optical coupling circuit A is connected with a start-up pulse instruction and a shut-down pulse instruction, and an optical coupling device is used for isolation. The output end of the optical coupling circuit A is connected with the operational amplifier circuit B; because the received instruction is a pulse instruction, if the optocoupler is adopted independently, the on-off state cannot be locked, and therefore the operational amplifier connected into positive feedback is adopted to maintain the state. The output end of the operational amplifier circuit B is connected with a surge current suppression circuit C, and the surge current suppression circuit C is a switch circuit based on an N-channel enhancement type MOSFET transistor and is used as an execution circuit for suppressing surge current and turning on and off. The on-off of the isolated pulse is realized under the control of an isolated pulse instruction by adopting an electronic circuit based on an optical coupler, the mechanical property is better, the isolated pulse is not sensitive to an external magnetic field, and the switching frequency is almost not limited.
Description
Technical Field
The invention belongs to the field of power electronics, and particularly relates to an optical coupling isolation type pulse instruction power electronic switch circuit.
Background
The intellectualization of the electronic device requires that it has the function of power on and off, and usually, the power on and off is realized by switching the switching power supply of the electronic device through a power on and off instruction. For the anti-jamming performance of the device, it is usually required that the power-on/off command be isolated from the electronic circuitry of the controlled electronic device. To save energy, the power-on/off command is usually in the form of a pulse, not a level.
The isolated pulse instruction of the switching power supply can be started and shut down through an electromagnetic relay. The large-power electromagnetic relay has large volume and weight; electromagnetic relays being electromechanical devicesThe mechanical property is poor, and the state of the relay can be changed in a large-magnitude mechanical environment; the electromagnetic relay is sensitive to an external magnetic field; the electromagnetic relay is an abrasion element, and the switch life is 104～107. In addition, by adopting a switching mode of the magnetic latching electromagnetic relay, if a shutdown instruction is not sent before the equipment is powered off, the equipment is still in a turned-on state without sending a startup instruction when the equipment is powered on next time, and abnormal startup can be caused.
Disclosure of Invention
In view of the above, the invention provides an optical coupler isolation type pulse instruction power electronic switch circuit, which abandons an electromagnetic relay and adopts an operational amplifier locking pulse instruction which is connected into positive feedback by optical coupler combination, thereby realizing the locking on/off state; compared with a switching circuit realized by the existing electromagnetic relay, the electromagnetic relay has better mechanical property, and the state can not be changed in a large-magnitude mechanical environment; is insensitive to external magnetic field; as long as the power supply end is powered off, no matter whether a power-off instruction is sent, when the power supply end is powered on next time, the equipment is in a power-off state.
In order to solve the technical problems, the specific method of the invention is as follows:
an optical coupling isolation type pulse instruction power electronic switch circuit comprises an optical coupling circuit, an operational amplifier circuit and a surge current suppression circuit;
the optical coupling circuit consists of a starting photoelectric coupler and a shutdown photoelectric coupler, wherein two input ends of the starting photoelectric coupler are respectively connected with a starting command positive line On + and a starting command return line On-, and two input ends of the shutdown photoelectric coupler are respectively connected with a shutdown command positive line Off + and a shutdown command return line Off-;
the operational amplifier circuit comprises an operational amplifier N1 connected into a positive feedback, and a diode D1 and a resistor R6 are sequentially connected to the positive feedback; the collector of the triode in the starting photoelectric coupler is connected with the inverting input end of the operational amplifier N1, and the collector of the triode in the shutdown photoelectric coupler is connected with the non-inverting input end of the operational amplifier N1; the inverting input end of the operational amplifier N1 is further connected with an input voltage loop Vin-through a resistor R4, and is connected with the cathode of a voltage stabilizing diode DZ1 through a resistor R2; the non-inverting input end of the operational amplifier N1 is further connected with an input voltage loop Vin-through a resistor R5, and is connected with the cathode of a voltage stabilizing diode DZ1 through a resistor R3; the cathode of the voltage stabilizing diode DZ1 is connected with an input voltage positive line Vin + through a resistor R1, and is also connected with a power supply end Vcc of an operational amplifier N1, and the anode of the voltage stabilizing diode DZ1 is connected with an input voltage return line Vin-;
the surge current suppression circuit is a switch circuit based on an N-channel enhancement type MOSFET transistor Q1, the grid electrode of the MOSFET transistor Q1 is connected with the output end of the operational amplifier N1 through a resistor R7, and is connected with an input voltage loop Vin-through a capacitor C1; the source of MOSFET transistor Q1 is connected to input voltage return Vin-, and the drain is the output of the present switching circuit.
The working principle of the invention is as follows:
1. initial state: the equipment is powered on, a starting instruction and a shutdown instruction are not sent, the voltages of the inverting input end and the non-inverting input end of the operational amplifier circuit are initial values V1a and V2a respectively, V1a is greater than V2a, the output end V3 of the operational amplifier circuit is approximately equal to 0, a switching tube Q1 of the surge current suppression circuit (C) is cut off, and the equipment is in a turn-off state;
2. the off state is changed to the on state: applying a pulse starting instruction through the optical coupling circuit, reducing an inverting input end V1 of the operational amplifier circuit to V1b, wherein V1b is approximately equal to 0, an output end V3 of the operational amplifier circuit is about power supply voltage Vcc, a switching tube of the surge current suppression circuit is conducted, power supply of equipment is turned on, and the equipment is started; the non-inverting input end V2 of the operational amplifier circuit changes the non-inverting input end V2 of the operational amplifier circuit (B) into V2B due to the positive feedback effect of the diode D1 and the resistor R6, and V2B is more than V2 a; when the starting pulse instruction is ended, the inverting input end V1 of the operational amplifier circuit (B) returns to the initial value V1a, at the moment, the non-inverting input end V2 of the operational amplifier circuit (B) is V2B, V2B is more than V1a, the switching tube of the surge current suppression circuit (C) is in a locked conduction state, and the equipment is in a locked conduction state;
3. turning on state to off state: a pulse shutdown instruction is applied through the optical coupling circuit, the non-inverting input end V2 of the operational amplifier circuit is reduced to V2c, V2c is approximately equal to 0, the inverting input end V1 of the operational amplifier circuit is equal to V1a, the output end V3 of the operational amplifier circuit is approximately equal to 0, a switching tube of the surge current suppression circuit is turned off, and power supply of equipment is turned off; and (3) the shutdown pulse is ended, the positive feedback action of the diode D1 and the resistor R6 is ended, the non-inverting input end V2 of the operational amplifier circuit is changed to an initial value V2a, at the moment, the inverting input end V1 of the operational amplifier circuit (B) is V1a, V1a is larger than V2a, the output end V3 of the operational amplifier circuit is approximately equal to 0, the MOSFET Q1 maintains the cut-off state, and the device is locked in the cut-off state. After the input power supply end Vin is powered off, when the power supply end Vin is powered on again, the power supply circuit is in an initial state, the voltages of the inverting input end and the non-inverting input end of the operational amplifier circuit are initial values V1a and V2a respectively, V1a is larger than V2a, the output end V3 of the operational amplifier circuit is approximately equal to 0, a switching tube Q1 of the surge current suppression circuit (C) is cut off, and the equipment is still in an off state.
Compared with the prior art, the invention has the beneficial effects that:
(1) because the switch based on the electronic circuit is adopted, but not based on electromechanical devices, such as a relay, the mechanical property of the invention is better, and the state can not be changed in a large-magnitude mechanical environment; the magnetic field is insensitive to the external magnetic field, and the switching times are almost not limited;
(2) because the electronic circuit switch does not memorize the previous state after power failure, as long as the power supply end is powered off, no matter whether a shutdown instruction is sent, when the power supply end is powered on next time, the switch is in the turn-off state of the initial state, and the equipment is in the turn-off state.
Drawings
FIG. 1 is a schematic composition diagram of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
The invention provides an optical coupling isolation type pulse instruction power electronic switch circuit. As shown in fig. 1, the switching circuit includes an optical coupler circuit a, an operational amplifier circuit B, and a surge current suppression circuit C. The input end of the optical coupling circuit A is connected with a start-up pulse instruction and a shut-down pulse instruction, and an optical coupling device is used for isolation. The output end of the optical coupling circuit A is connected with the operational amplifier circuit B; because the received instruction is a pulse instruction, if the optocoupler is adopted independently, the on-off state cannot be locked, and therefore the operational amplifier connected into positive feedback is adopted to maintain the state. The output end of the operational amplifier circuit B is connected with a surge current suppression circuit C, and the surge current suppression circuit C is a switch circuit based on an N-channel enhancement type MOSFET transistor and is used as an execution circuit for suppressing surge current and turning on and off.
Therefore, the invention abandons the electromagnetic relay and avoids a series of problems of using the electromagnetic relay.
Referring to fig. 1, an input voltage positive line Vin + is connected to one end of a resistor R1; the other end of the resistor R1 is connected with the cathode of the voltage stabilizing diode DZ1, one end of the resistor R2, one end of the resistor R3 and a power supply pin Vcc of the operational amplifier N1; the anode of the voltage stabilizing diode DZ1 is connected with an input voltage loop Vin-; the other end of the resistor R2 is connected with one end of the resistor R4, the inverting input end of the operational amplifier N1 and the collector of the triode of the photoelectric coupler U1; the other end of the resistor R4 is connected with an input voltage return line Vin-; the other end of the resistor R3 is connected with one end of the resistor R5, the non-inverting input end of the operational amplifier N1, the collector of the triode of the photoelectric coupler U2 and one end of the resistor R6; the other end of the resistor R5 is connected with an input voltage return line Vin-; the other end of the resistor R6 is connected with the cathode of the diode D1; the anode of the diode D1 is connected with the output end of the operational amplifier N1 and one end of the resistor R7; the other end of the resistor R7 is connected with one end of a capacitor C1 and the grid of a surge current suppression MOSFET Q1; the source electrode of the surge current suppression MOSFET Q1 is connected with an input voltage loop Vin-; the drain electrode of the MOSFET Q1 is connected with an external device power supply circuit; the input voltage loop Vin-is connected with the emitter of the triode of the photoelectric coupler U1, the emitter of the triode of the photoelectric coupler U2 and the power supply loop pin Gnd of the operational amplifier N1; the starting-up instruction positive line On + is connected with the anode end of a diode of the photoelectric coupler U1; the starting-up instruction loop line On is connected with the cathode end of a diode of the photoelectric coupler U1; the shutdown instruction positive line Off + is connected with the anode end of a diode of the photoelectric coupler U2; the shutdown command return line Off is connected to the cathode terminal of the diode of the photocoupler U2.
The equipment realizes the on-off work in the following way:
1. initial state: v1 is an initial value V1a, V2 is an initial value V2a, V1a is greater than V2a, V3 is approximately equal to 0, the MOSFET tube Q1 is cut off, and the device is in a cut-off state;
2. the off state is changed to the on state: applying a pulse starting command, reducing the voltage V1 to V1b, V1b is approximately equal to 0, V3 is approximately equal to Vcc, a MOSFET tube Q1 is conducted, and the power supply is started; v2 due to the positive feedback effect of diode D1 and resistor R6, V2 changes to V2b, and V2b is more than V2 a; after the start-up pulse command is finished, V1 returns to the initial value V1a, at the moment, V2 is V2b, V2b is more than V1a, the MOSFET Q1 maintains the on state, and the equipment maintains the on state;
3. turning on state to off state: applying a pulse shutdown command, reducing the voltage V2 to V2c, V2c is approximately equal to 0, V1 is approximately equal to V1a, V3 is approximately equal to 0, a MOSFET tube Q1 is turned off, the input voltage is turned off, and the device is shut down; when the shutdown pulse is ended, the positive feedback action of the diode D1 and the resistor R6 is ended, V2 changes to an initial value V2a, at this time, V1 is equal to V1a, V1a is greater than V2a, V3 is equal to 0, the MOSFET Q1 maintains the cut-off state, and the device maintains the cut-off state.
In a word, the off state of the invention depends on the comparison of the operational amplifier circuit, outputs low level and closes the switching tube of the surge current suppression circuit. And the switching-on state outputs high level under the action of a starting-up instruction, a switching tube of the surge current suppression circuit is switched on, and the switching-on state is locked by means of positive feedback of the operational amplifier after the pulse instruction is finished. The turn-off state excites the operational amplifier circuit by means of a turn-off instruction, the switching tube of the surge current suppression circuit is closed, the operational amplifier circuit returns to the turn-off state, and the turn-off state is locked.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. An optical coupling isolation type pulse instruction power electronic switch circuit is characterized by comprising an optical coupling circuit (A), an operational amplifier circuit (B) and a surge current suppression circuit (C);
the optical coupling circuit (A) consists of a starting photoelectric coupler and a shutdown photoelectric coupler, wherein two input ends of the starting photoelectric coupler are respectively connected with a starting command positive line On + and a starting command return line On-, and two input ends of the shutdown photoelectric coupler are respectively connected with a shutdown command positive line Off + and a shutdown command return line Off-; the starting instruction and the shutdown instruction are pulse instructions;
the operational amplifier circuit (B) comprises an operational amplifier N1 connected into a positive feedback, and a diode D1 and a resistor R6 are sequentially connected onto the positive feedback; the collector of the triode in the starting photoelectric coupler is connected with the inverting input end of the operational amplifier N1, and the collector of the triode in the shutdown photoelectric coupler is connected with the non-inverting input end of the operational amplifier N1; the inverting input end of the operational amplifier N1 is further connected with an input voltage loop Vin-through a resistor R4, and is connected with the cathode of a voltage stabilizing diode DZ1 through a resistor R2; the non-inverting input end of the operational amplifier N1 is further connected with an input voltage loop Vin-through a resistor R5, and is connected with the cathode of a voltage stabilizing diode DZ1 through a resistor R3; the cathode of the voltage stabilizing diode DZ1 is connected with the positive line Vin + of the input voltage through a resistor R1, the cathode of the voltage stabilizing diode DZ1 is also connected with the power supply terminal Vcc of the operational amplifier N1, and the anode of the voltage stabilizing diode DZ1 is connected with the input voltage loop Vin-;
the surge current suppression circuit (C) is a switch circuit based on an N-channel enhancement type MOSFET transistor Q1, the grid electrode of the MOSFET transistor Q1 is connected with the output end of the operational amplifier N1 through a resistor R7, and is connected with an input voltage loop Vin-through a capacitor C1; the source of MOSFET transistor Q1 is connected to input voltage loop Vin-and the drain is the output of the present switching circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611189336.2A CN107070440B (en) | 2016-12-21 | 2016-12-21 | Optical coupling isolation type pulse instruction power electronic switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611189336.2A CN107070440B (en) | 2016-12-21 | 2016-12-21 | Optical coupling isolation type pulse instruction power electronic switch circuit |
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| CN107070440A CN107070440A (en) | 2017-08-18 |
| CN107070440B true CN107070440B (en) | 2020-07-07 |
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| CN201611189336.2A Active CN107070440B (en) | 2016-12-21 | 2016-12-21 | Optical coupling isolation type pulse instruction power electronic switch circuit |
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| CN110230436B (en) * | 2019-05-23 | 2020-04-07 | 南京理工大学 | Control and telemetering circuit applied to cube star separation device |
| CN112865775A (en) * | 2021-01-07 | 2021-05-28 | 中国电子科技集团公司第四十三研究所 | Remote control startup and shutdown circuit |
| CN113991610B (en) * | 2021-10-28 | 2023-05-02 | 北京卫星制造厂有限公司 | Satellite-borne power supply on-off enabling and under-voltage locking circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427806A (en) * | 2012-05-16 | 2013-12-04 | 浙江科跃焊接设备有限公司 | Voltage comparator with signal locking function |
| CN104635581A (en) * | 2015-01-12 | 2015-05-20 | 北京联合大学 | Single-chip microprocessor-controlled hysteresis voltage comparator |
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2016
- 2016-12-21 CN CN201611189336.2A patent/CN107070440B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427806A (en) * | 2012-05-16 | 2013-12-04 | 浙江科跃焊接设备有限公司 | Voltage comparator with signal locking function |
| CN104635581A (en) * | 2015-01-12 | 2015-05-20 | 北京联合大学 | Single-chip microprocessor-controlled hysteresis voltage comparator |
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| CN107070440A (en) | 2017-08-18 |
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