CN109672139B - Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control - Google Patents

Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control Download PDF

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Publication number
CN109672139B
CN109672139B CN201811446109.2A CN201811446109A CN109672139B CN 109672139 B CN109672139 B CN 109672139B CN 201811446109 A CN201811446109 A CN 201811446109A CN 109672139 B CN109672139 B CN 109672139B
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phase
resistor
anode
protection
circuit
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CN109672139A (en
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暨仲明
陈德传
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Beijing Zhongzhi Zhongke Technology Development Co ltd
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Hangzhou Dianzi University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for three-phase systems
    • 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
    • H03K17/79—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 bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region

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Abstract

The invention relates to a three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control. The circuit comprises an optical isolation type three-phase wide voltage driving circuit and a three-phase short circuit and overload protection circuit. The phase-locked loop circuit specifically comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase triode VT1, a B-phase triode VT2, a C-phase triode VT3, a reverse resistance type thyristor VT4, an A-phase bidirectional thyristor VT5, a B-phase bidirectional thyristor VT6, a C-phase bidirectional thyristor VT7, an A-phase inductor L1, a B-phase inductor L2, a C-phase inductor L3, an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC1, an A-phase upper diode D1, an A-phase lower diode D4, a B-phase upper diode D3, a B-phase lower diode D6, a C-phase upper diode D5, a C-phase lower diode D. The invention can meet the requirements of switching control on the three-phase alternating current solid-state relay circuit by using a wide range of control voltage and reliable real-time protection on short circuit or overcurrent fault of a three-phase alternating current load.

Description

Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control
Technical Field
The invention belongs to the field of industrial measurement and control, relates to a circuit, in particular to a three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control, and is suitable for application occasions of contactless switch control in a three-phase alternating current power supply or driving circuit.
Background
Contactless solid-state relays are increasingly used because of their advantages of no mechanical contacts, fast response, long life, etc. However, a three-phase alternating current solid-state relay using a TRIAC (TRIAC) as a power control device is not a product with a reliable self-protection function for short circuit or overload faults at present. Although some related technical reports are provided with current detection and turn-off circuits, the circuits cannot be protected in time to damage a three-phase alternating-current load short circuit or overload fault which occurs suddenly, and the main problem is that the existing three-phase alternating-current solid-state relay has no inhibition capability on current sudden change in the circuits. Meanwhile, due to the continuous expansion of the application field, the switching control can be carried out by adapting to a wide range of control voltage without adjusting circuit parameters. Therefore, how to design a scheme of a three-phase alternating-current solid-state relay which can reliably perform short-circuit and overload protection, has a simple circuit, is easy to produce, and can perform wide-range voltage drive control is the starting point of the invention.
Disclosure of Invention
The invention aims to provide a three-phase alternating-current solid-state relay circuit with short-circuit protection and wide voltage control, aiming at the defects in the prior art. The circuit consists of an optical isolation type three-phase wide voltage drive circuit and a three-phase short circuit and overload protection circuit, and is characterized in that on the basis that a three-phase optical coupler adopts a parallel constant current switch drive control mode, each phase takes a bidirectional Thyristor (TRIAC) as a power control device and is connected with a small inductor in series to inhibit current mutation, a current sensor is configured, and a reverse resistance type thyristor is taken as a protection control device, so that the circuit can reliably carry out turn-off protection when a three-phase alternating current load is in short circuit or overload.
The circuit comprises an optical isolation type three-phase wide voltage driving circuit and a three-phase short circuit and overload protection circuit.
The optical isolation type three-phase wide voltage driving circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase triode VT1, a B-phase triode VT1, a C-phase triode VT1, an A-phase bidirectional thyristor VT1, a B-phase bidirectional thyristor VT1, a C-phase bidirectional thyristor VT1, an A-phase inductor L1, a B-phase inductor L1, a C-phase inductor L1, an A-phase protection capacitor C1, a B-phase protection capacitor C1, a C-phase protection capacitor C1, an input resistor R1, an A-phase anode resistor R1, an A-phase current-limiting resistor R1, an A-phase collector resistor R1, a B-phase anode resistor R1, a B-phase current-limiting resistor R1, a C-phase anode resistor R1, a C-phase current-limiting resistor R1, a C-phase collector R1, a gate driver R1, a gate resistor R1, a gate R1, a phase protection resistor R1, a phase protection resistor R1, The LED driving circuit comprises a C-phase gate resistor R18, a C-phase protection resistor R19 and an A-phase Load-A, B, wherein the positive driving end IN + end is connected with one end of an input resistor R1, the other end of the input resistor R1 is connected with anodes of an A-phase anode resistor R2, an A-phase collector resistor R4, a B-phase anode resistor R5, a B-phase collector resistor R7, a C-phase anode resistor R8, a C-phase collector resistor R10 and a reverse resistance type thyristor VT4, the other end of the A-phase anode resistor R2 is connected with an anode of a-phase optical coupler IC1 and a light emitting side, a cathode of the A-phase optical coupler IC1 and a light emitting side of an A-phase current limiting resistor R3 and a base of an A-phase triode VT1, the other end of the A-phase collector resistor R4 is connected with a collector of the A-phase triode VT1, the other end of the B-phase anode resistor R2 and a cathode of the B-phase light emitting side of the light emitting resistor R2 and a cathode of the light emitting side of the A-phase current limiting resistor R8653, The base of the B-phase triode VT2 is connected, the other end of the B-phase collector resistor R7 is connected with the collector of the B-phase triode VT2, the other end of the C-phase anode resistor R8 is connected with the anode of the light emitting side of the C-phase optocoupler IC3, the cathode of the light emitting side of the C-phase optocoupler IC3 is connected with one end of the C-phase current limiting resistor R9 and the base of the C-phase triode VT1, the other end of the C-phase collector resistor R10 is connected with the collector of the C-phase triode VT3, the emitter of the A-phase triode VT1, the emitter of the B-phase triode VT2, the emitter of the C-phase triode VT3, the other end of the A-phase current limiting resistor R3, the other end of the B-phase current limiting resistor R6, the other end of the C-phase current limiting resistor R9, and the cathode of.
One end of the output side of the a-phase optical coupler IC1 is connected with one end of the a-phase driving resistor R11, the other end of the output side of the a-phase optical coupler IC1 is connected with one end of the a-phase gate resistor R12 and the gate of the a-phase bidirectional thyristor VT5, the a-phase end of the alternating current power supply is connected with one end of the a-phase inductor L1, the other end of the a-phase inductor L1 is connected with the 1 st anode of the a-phase bidirectional thyristor VT5, the other end of the a-phase driving resistor R11 and one end of the a-phase protection resistor R13, the other end of the a-phase protection resistor R13 is connected with one end of the a-phase protection capacitor C1, and a connecting line of one end of the a-phase Load-a passes through the detection hole of the a-phase current sensor SC1 and then is connected with the 2 nd anode of the a-phase bidirectional thyristor VT 5.
One end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase driving resistor R14, the other end of the output side of the A-phase optical coupler IC1 is connected with one end of a B-phase gate resistor R15 and a gate of a B-phase bidirectional thyristor VT5, the B end of the B-phase end of an alternating current power supply is connected with one end of a B-phase inductor L2, the other end of the B-phase inductor L2 is connected with the 1 st anode of the B-phase bidirectional thyristor VT6, the other end of the B-phase driving resistor R14 and one end of a B-phase protection resistor R16, the other end of the B-phase protection resistor R16 is connected with one end of a B-phase protection capacitor C2, and a connecting line of one end of a B-phase Load-B passes through a detection hole of a B-phase current sensor SC2 and then is connected with the 2 nd anode of the B-phase bidirectional thyristor VT.
One end of the output side of the C-phase optical coupler IC3 is connected to one end of a C-phase driving resistor R17, the other end of the output side of the C-phase optical coupler IC3 is connected to one end of a C-phase gate resistor R18 and a gate of a C-phase bidirectional thyristor VT7, the C-phase end C of an alternating current power supply is connected to one end of a C-phase inductor L3, the other end of the C-phase inductor L3 is connected to the 1 st anode of the C-phase bidirectional thyristor VT7, the other end of the C-phase driving resistor R17 and one end of a C-phase protection resistor R19, the other end of the C-phase protection resistor R19 is connected to one end of a C-phase protection capacitor C3, and a connection line of one end of a C-phase Load-C passes through a detection hole of the C-phase current sensor SC3 and then is connected to the 2 nd anode of the C-phase bidirectional thyristor VT 7.
In a three-phase three-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load and the other end of the C-phase Load. In a three-phase four-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load, the other end of the C-phase Load and the N end of the zero line end of the alternating current power supply.
The three-phase short circuit and overload protection circuit comprises a reverse-resistance type thyristor VT4, an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC3, an A-phase upper diode D1, a C-phase lower diode D2, a B-phase upper diode D3, an A-phase lower diode D3, a C-phase upper diode D3, a B-phase lower diode D3, a conversion resistor R3, a filter resistor R3, a voltage division resistor R3 and a filter capacitor C3, wherein the 2 nd output end I3 end of the A-phase current sensor SC3 is connected with the 2 nd output end I3 end of the B-phase current sensor SC3 and the 2 nd output end I3 end of the C-phase current sensor SC3, the 1 st output end I3 end of the A-phase current sensor SC3 is connected with the anode of the A-phase upper diode D3 and the cathode of the A-phase lower diode D3, the 1 st output end I3 end of the B-phase current sensor SC3 is connected with the anode of the B-phase upper diode D3, and the cathode of the C-phase current sensor SC3, The cathode of the diode D2 under the phase C is connected, the cathode of the diode D1 on the phase A is connected with the cathode of the diode D3 on the phase B, the cathode of the diode D5 on the phase C, one end of the conversion resistor R20 and one end of the filter resistor R21, the other end of the filter resistor R21 is connected with one end of the voltage dividing resistor R22, one end of the filter capacitor C4 and the gate of the reverse resistance type thyristor VT4, the anode of the diode D4 under the phase A is connected with the anode of the diode D6 under the phase B, the anode of the diode D2 under the phase C, the other end of the conversion resistor R20, the other end of the filter capacitor C4 and the other end of the voltage dividing resistor R22 are connected with the negative driving end IN-end.
The invention has the following beneficial effects:
the invention adopts a simple circuit scheme which mainly comprises three optocouplers, three bidirectional Thyristors (TRIAC), a reverse resistance type thyristor, three small inductors, three current sensors, six diodes and the like which work in a constant current switch control mode, and can completely meet the requirements of performing switch control on a three-phase alternating current solid state relay circuit by using control voltage in a wide range and performing reliable real-time protection on short circuit or overcurrent fault of a three-phase alternating current load. The circuit is simple, low in cost, high in reliability, good in universality and easy to produce.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the three-phase ac solid-state relay circuit with short-circuit protection and wide voltage control includes an optical isolation type three-phase wide voltage driving circuit and a three-phase short-circuit and overload protection circuit.
The optical isolation type three-phase wide voltage driving circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase triode VT1, a B-phase triode VT1, a C-phase triode VT1, an A-phase bidirectional thyristor VT1, a B-phase bidirectional thyristor VT1, a C-phase bidirectional thyristor VT1, an A-phase inductor L1, a B-phase inductor L1, a C-phase inductor L1, an A-phase protection capacitor C1, a B-phase protection capacitor C1, a C-phase protection capacitor C1, an input resistor R1, an A-phase anode resistor R1, an A-phase current-limiting resistor R1, an A-phase collector resistor R1, a B-phase anode resistor R1, a B-phase current-limiting resistor R1, a C-phase anode resistor R1, a C-phase current-limiting resistor R1, a C-phase collector R1, a gate driver R1, a gate resistor R1, a gate R1, a phase protection resistor R1, a phase protection resistor R1, The LED driving circuit comprises a C-phase gate resistor R18, a C-phase protection resistor R19 and an A-phase Load-A, B, wherein the positive driving end IN + end is connected with one end of an input resistor R1, the other end of the input resistor R1 is connected with anodes of an A-phase anode resistor R2, an A-phase collector resistor R4, a B-phase anode resistor R5, a B-phase collector resistor R7, a C-phase anode resistor R8, a C-phase collector resistor R10 and a reverse resistance type thyristor VT4, the other end of the A-phase anode resistor R2 is connected with an anode of a-phase optical coupler IC1 and a light emitting side, a cathode of the A-phase optical coupler IC1 and a light emitting side of an A-phase current limiting resistor R3 and a base of an A-phase triode VT1, the other end of the A-phase collector resistor R4 is connected with a collector of the A-phase triode VT1, the other end of the B-phase anode resistor R2 and a cathode of the B-phase light emitting side of the light emitting resistor R2 and a cathode of the light emitting side of the A-phase current limiting resistor R8653, The base of the B-phase triode VT2 is connected, the other end of the B-phase collector resistor R7 is connected with the collector of the B-phase triode VT2, the other end of the C-phase anode resistor R8 is connected with the anode of the light emitting side of the C-phase optocoupler IC3, the cathode of the light emitting side of the C-phase optocoupler IC3 is connected with one end of the C-phase current limiting resistor R9 and the base of the C-phase triode VT1, the other end of the C-phase collector resistor R10 is connected with the collector of the C-phase triode VT3, the emitter of the A-phase triode VT1, the emitter of the B-phase triode VT2, the emitter of the C-phase triode VT3, the other end of the A-phase current limiting resistor R3, the other end of the B-phase current limiting resistor R6, the other end of the C-phase current limiting resistor R9, and the cathode of.
One end of the output side of the a-phase optical coupler IC1 is connected with one end of the a-phase driving resistor R11, the other end of the output side of the a-phase optical coupler IC1 is connected with one end of the a-phase gate resistor R12 and the gate of the a-phase bidirectional thyristor VT5, the a-phase end of the alternating current power supply is connected with one end of the a-phase inductor L1, the other end of the a-phase inductor L1 is connected with the 1 st anode of the a-phase bidirectional thyristor VT5, the other end of the a-phase driving resistor R11 and one end of the a-phase protection resistor R13, the other end of the a-phase protection resistor R13 is connected with one end of the a-phase protection capacitor C1, and a connecting line of one end of the a-phase Load-a passes through the detection hole of the a-phase current sensor SC1 and then is connected with the 2 nd anode of the a-phase bidirectional thyristor VT 5.
One end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase driving resistor R14, the other end of the output side of the A-phase optical coupler IC1 is connected with one end of a B-phase gate resistor R15 and a gate of a B-phase bidirectional thyristor VT5, the B end of the B-phase end of an alternating current power supply is connected with one end of a B-phase inductor L2, the other end of the B-phase inductor L2 is connected with the 1 st anode of the B-phase bidirectional thyristor VT6, the other end of the B-phase driving resistor R14 and one end of a B-phase protection resistor R16, the other end of the B-phase protection resistor R16 is connected with one end of a B-phase protection capacitor C2, and a connecting line of one end of a B-phase Load-B passes through a detection hole of a B-phase current sensor SC2 and then is connected with the 2 nd anode of the B-phase bidirectional thyristor VT.
One end of the output side of the C-phase optical coupler IC3 is connected to one end of a C-phase driving resistor R17, the other end of the output side of the C-phase optical coupler IC3 is connected to one end of a C-phase gate resistor R18 and a gate of a C-phase bidirectional thyristor VT7, the C-phase end C of an alternating current power supply is connected to one end of a C-phase inductor L3, the other end of the C-phase inductor L3 is connected to the 1 st anode of the C-phase bidirectional thyristor VT7, the other end of the C-phase driving resistor R17 and one end of a C-phase protection resistor R19, the other end of the C-phase protection resistor R19 is connected to one end of a C-phase protection capacitor C3, and a connection line of one end of a C-phase Load-C passes through a detection hole of the C-phase current sensor SC3 and then is connected to the 2 nd anode of the C-phase bidirectional thyristor VT 7.
In a three-phase three-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load and the other end of the C-phase Load. In a three-phase four-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load, the other end of the C-phase Load and the N end of the zero line end of the alternating current power supply.
The three-phase short circuit and overload protection circuit comprises a reverse-resistance type thyristor VT4, an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC3, an A-phase upper diode D1, a C-phase lower diode D2, a B-phase upper diode D3, an A-phase lower diode D3, a C-phase upper diode D3, a B-phase lower diode D3, a conversion resistor R3, a filter resistor R3, a voltage division resistor R3 and a filter capacitor C3, wherein the 2 nd output end I3 end of the A-phase current sensor SC3 is connected with the 2 nd output end I3 end of the B-phase current sensor SC3 and the 2 nd output end I3 end of the C-phase current sensor SC3, the 1 st output end I3 end of the A-phase current sensor SC3 is connected with the anode of the A-phase upper diode D3 and the cathode of the A-phase lower diode D3, the 1 st output end I3 end of the B-phase current sensor SC3 is connected with the anode of the B-phase upper diode D3, and the cathode of the C-phase current sensor SC3, The cathode of the diode D2 under the phase C is connected, the cathode of the diode D1 on the phase A is connected with the cathode of the diode D3 on the phase B, the cathode of the diode D5 on the phase C, one end of the conversion resistor R20 and one end of the filter resistor R21, the other end of the filter resistor R21 is connected with one end of the voltage dividing resistor R22, one end of the filter capacitor C4 and the gate of the reverse resistance type thyristor VT4, the anode of the diode D4 under the phase A is connected with the anode of the diode D6 under the phase B, the anode of the diode D2 under the phase C, the other end of the conversion resistor R20, the other end of the filter capacitor C4 and the other end of the voltage dividing resistor R22 are connected with the negative driving end IN-end.
All devices used by the invention, including an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase triode VT1, a B-phase triode VT2, a C-phase triode VT3, an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC3, a reverse resistance type thyristor VT1, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, an A-phase upper diode D1, an A-phase lower diode D4, a B-phase upper diode D3, a B-phase lower diode D6, a C-phase upper diode D5, a C-phase lower diode D2 and the like, are made of existing mature products and can be obtained through the market. For example: the optocoupler adopts MOC3083, the triode adopts C9014, the current sensor adopts an LD series current transformer, the reverse-resistance type thyristor adopts a KK1-2 fast thyristor, the bidirectional thyristor adopts a BCR series, and the diode adopts an SB series Schottky diode and the like.
The main circuit parameters in the invention are matched as follows:
setting: i isFIs the optical coupler driving current (unit: A), UgTHThe measured current and the output current of A, B, C phase current sensor are respectively I1x、I2x(unit: a), wherein x is A, B, C, and the current ratio of each phase current sensor is ki＝I2x/I1xOrder: i is1xmMeasured current I allowed for x phase1xMaximum value of (2) (single)Bit: A) and I is1Am＝I1Bm＝I1Cm＝I1mAnd then:
R3＝R6＝R9＝0.7/IF (1)
R21＞＞R20 (2)
in the formula, R3、R6、R9The resistance values (unit: omega) of the phase A current limiting resistor R3, the phase B current limiting resistor R6 and the phase C current limiting resistor R9 are respectively20、R21、R22The resistance values (unit: omega) of the conversion resistor R20, the filter resistor R21 and the voltage dividing resistor R22 are respectively.
The working process of the invention is as follows:
(1) wide-range voltage driving action of input control stage: in the input stage control circuit, the A-phase triode VT1, the B-phase triode VT2 and the C-phase triode VT3 are all triodes with high common emitter current amplification factor, and then the driving current I of the A-phase optical coupler IC1, the B-phase optical coupler IC2 and the C-phase optical coupler IC3FThe constant current driving circuit on the light emitting side of the three-phase optical coupler is determined by the formula (1) and adopts a parallel structure and an optical coupler driven by low current so as to adapt to low input driving control voltage. Therefore, when the positive driving end IN + end and the negative driving end IN-end can apply wide switch control voltage, the current flowing through the light-emitting side of each optocoupler can be kept constant so as to ensure that each phase of bidirectional thyristors can be normally driven.
(2) The isolation drive control function on the three-phase alternating current load is as follows: three-phase driving control in the circuit has a photoelectric isolation function, and the light emitting control sides of the A-phase optical coupler IC1, the B-phase optical coupler IC2 and the C-phase optical coupler IC3 are constant current control circuits. The positive driving end IN + of the circuit is connected with the positive end of the driving voltage, and the negative driving end IN-of the circuit is connected with the negative end of the driving voltage. IN general application, the positive drive end IN + end can be connected with a power supply voltage end of a superior control circuit, the negative drive end IN-end is used as a switch control end of the superior control circuit, and when the control end is at a low level, the three-phase optocouplers are simultaneously conducted, so that the three-phase bidirectional thyristor is conducted to supply power to the three-phase alternating-current load; when the control end is at high level, the optical coupler is turned off, so that the three-phase bidirectional thyristor is turned off, and the three-phase alternating current load is powered off.
(3) Three-phase short circuit and overload measurement and control protection function: the protection of three-phase AC load, whether short-circuit or overload, is essentially that the three-phase bidirectional thyristors are turned off simultaneously when the phase current exceeds the maximum value allowed, for which purpose, in the short-circuit or overload protection of the circuit of the invention, the allowed current and its maximum value are set to I0mAnd is also the threshold for the protection action. Meanwhile, small inductors are arranged in the three-phase load circuit, so that instantaneous sudden change of circuit current is prevented, and the protection control circuit can timely perform effective protection operation. Each phase adopts a current sensor to monitor the load current of each phase in real time, and once the load current reaches I1mThe reverse-resistance thyristor VT4 is turned on under the action of a rectifying circuit, a filtering circuit, a voltage dividing circuit and the like mainly composed of an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC3, an A-phase upper diode D1, a C-phase lower diode D2, a B-phase upper diode D3, an A-phase lower diode D4, a C-phase upper diode D5, a B-phase lower diode D6, a conversion resistor R20, a filter resistor R21, a voltage dividing resistor R22 and a filter capacitor C4 in coordination of circuit parameters of the formula (1) and the formula (2), so that the three-phase bidirectional thyristor VT4 is turned off, and is always turned off before power-off restarting operation is not carried out after the three-phase bidirectional thyristor is turned off, and the protection control effect on the three-phase alternating-phase load short circuit or overload.

Claims (2)

1. Three-phase exchanges solid state relay circuit with short-circuit protection and wide voltage control, including the wide voltage drive circuit of light-insulated three-phase, three-phase short circuit and overload protection circuit, characterized in that:
the optical isolation type three-phase wide voltage driving circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase triode VT1, a B-phase triode VT1, a C-phase triode VT1, an A-phase bidirectional thyristor VT1, a B-phase bidirectional thyristor VT1, a C-phase bidirectional thyristor VT1, an A-phase inductor L1, a B-phase inductor L1, a C-phase inductor L1, an A-phase protection capacitor C1, a B-phase protection capacitor C1, a C-phase protection capacitor C1, an input resistor R1, an A-phase anode resistor R1, an A-phase current-limiting resistor R1, an A-phase collector resistor R1, a B-phase anode resistor R1, a B-phase current-limiting resistor R1, a C-phase anode resistor R1, a C-phase current-limiting resistor R1, a C-phase collector R1, a gate driver R1, a gate resistor R1, a gate R1, a phase protection resistor R1, a phase protection resistor R1, The LED driving circuit comprises a C-phase gate resistor R18, a C-phase protection resistor R19, an A-phase Load-A, B-phase Load-B and a C-phase Load-C, wherein the positive driving end IN + end is connected with one end of an input resistor R1, the other end of the input resistor R1 is connected with anodes of an A-phase anode resistor R2, an A-phase collector resistor R4, a B-phase anode resistor R5, a B-phase collector resistor R7, a C-phase anode resistor R8, a C-phase collector resistor R10 and a reverse resistance type thyristor VT4, the other end of the A-phase anode resistor R2 is connected with an anode of an A-phase optocoupler IC1 light emitting side, a cathode of the A-phase optocoupler IC1 light emitting side is connected with one end of the A-phase current limiting resistor R3 and a base of an A-phase triode 1, the other end of the A-phase collector resistor R4 is connected with a collector of an A-phase triode VT1, the other end of the B-phase anode resistor R5 is connected with an anode of a B-phase optocoupler IC 42 and a cathode of the light emitting side VT 9 is, The base of the B-phase triode VT2 is connected, the other end of the B-phase collector resistor R7 is connected with the collector of the B-phase triode VT2, the other end of the C-phase anode resistor R8 is connected with the anode of the light-emitting side of the C-phase optocoupler IC3, the cathode of the light-emitting side of the C-phase optocoupler IC3 is connected with one end of the C-phase current limiting resistor R9 and the base of the C-phase triode VT1, the other end of the C-phase collector resistor R10 is connected with the collector of the C-phase triode VT3, the emitter of the A-phase triode VT1, the emitter of the B-phase triode VT2, the emitter of the C-phase triode VT3, the other end of the A-phase current limiting resistor R3, the other end of the B-phase current limiting resistor R6, the other end of the C-phase current limiting resistor R9 and the cathode;
one end of the output side of the A-phase optical coupler IC1 is connected with one end of an A-phase driving resistor R11, the other end of the output side of the A-phase optical coupler IC1 is connected with one end of an A-phase gate resistor R12 and a gate of an A-phase bidirectional thyristor VT5, the A end of an alternating current power supply A phase is connected with one end of an A-phase inductor L1, the other end of the A-phase inductor L1 is connected with the 1 st anode of the A-phase bidirectional thyristor VT5, the other end of the A-phase driving resistor R11 and one end of an A-phase protection resistor R13, the other end of the A-phase protection resistor R13 is connected with one end of an A-phase protection capacitor C1, and a connecting line of one end of an A-phase Load-A passes through a detection hole of an A-phase current sensor SC1 and then is connected with the 2 nd anode of the A-phase bidirectional thyristor VT 5;
one end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase driving resistor R14, the other end of the output side of the A-phase optical coupler IC1 is connected with one end of a B-phase gate resistor R15 and a gate of a B-phase bidirectional thyristor VT5, the B end of the B-phase end of an alternating current power supply is connected with one end of a B-phase inductor L2, the other end of the B-phase inductor L2 is connected with the 1 st anode of the B-phase bidirectional thyristor VT6, the other end of the B-phase driving resistor R14 and one end of a B-phase protection resistor R16, the other end of the B-phase protection resistor R16 is connected with one end of a B-phase protection capacitor C2, and a connecting line of one end of a B-phase Load-B passes through a detection hole of a B-phase current sensor SC2 and then is connected with the 2 nd anode of the B-phase bidirectional thyristor VT;
one end of the output side of the C-phase optical coupler IC3 is connected with one end of a C-phase driving resistor R17, the other end of the output side of the C-phase optical coupler IC3 is connected with one end of a C-phase gate resistor R18 and a gate of a C-phase bidirectional thyristor VT7, the C-phase end C end of an alternating current power supply is connected with one end of a C-phase inductor L3, the other end of the C-phase inductor L3 is connected with the 1 st anode of the C-phase bidirectional thyristor VT7, the other end of the C-phase driving resistor R17 and one end of a C-phase protection resistor R19, the other end of the C-phase protection resistor R19 is connected with one end of a C-phase protection capacitor C3, and a connecting line of one end of a C-phase Load-C passes through a detection hole of a C-phase current sensor SC3 and then is connected with the 2 nd anode of the C-phase bidirectional thyristor VT 7;
in a three-phase three-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load and the other end of the C-phase Load; in a three-phase four-wire system load: the other end of the A-phase Load is connected with the other end of the B-phase Load, the other end of the C-phase Load and the N end of the zero line end of the alternating current power supply;
the three-phase short circuit and overload protection circuit comprises a reverse-resistance type thyristor VT4, an A-phase current sensor SC1, a B-phase current sensor SC2, a C-phase current sensor SC3, an A-phase upper diode D1, a C-phase lower diode D2, a B-phase upper diode D3, an A-phase lower diode D3, a C-phase upper diode D3, a B-phase lower diode D3, a conversion resistor R3, a filter resistor R3, a voltage division resistor R3 and a filter capacitor C3, wherein the 2 nd output end I3 end of the A-phase current sensor SC3 is connected with the 2 nd output end I3 end of the B-phase current sensor SC3 and the 2 nd output end I3 end of the C-phase current sensor SC3, the 1 st output end I3 end of the A-phase current sensor SC3 is connected with the anode of the A-phase upper diode D3 and the cathode of the A-phase lower diode D3, the 1 st output end I3 end of the B-phase current sensor SC3 is connected with the anode of the B-phase upper diode D3, and the cathode of the C-phase current sensor SC3, The cathode of the diode D2 under the phase C is connected, the cathode of the diode D1 on the phase A is connected with the cathode of the diode D3 on the phase B, the cathode of the diode D5 on the phase C, one end of the conversion resistor R20 and one end of the filter resistor R21, the other end of the filter resistor R21 is connected with one end of the voltage dividing resistor R22, one end of the filter capacitor C4 and the gate of the reverse resistance type thyristor VT4, the anode of the diode D4 under the phase A is connected with the anode of the diode D6 under the phase B, the anode of the diode D2 under the phase C, the other end of the conversion resistor R20, the other end of the filter capacitor C4 and the other end of the voltage dividing resistor R22 are connected with the negative driving end IN-end.
2. A three-phase ac solid-state relay circuit with short-circuit protection and wide voltage control as claimed in claim 1, wherein the circuit parameters are matched as follows:
setting: i isFFor opto-coupling driving current, UgTHThe measured current and the output current of a current sensor of A, B, C are respectively I1x、I2xWherein x is A, B, C, the current ratio of each phase current sensor is ki＝I2x/I1xOrder: i is1xmMeasured current I allowed for x phase1xMaximum value of (1), and I1Am＝I1Bm＝I1Cm＝I1mAnd then:
R3＝R6＝R9＝0.7/IF (1)
R21＞＞R20 (2)
in the formula, R3、R6、R9The resistance values of a phase A current limiting resistor R3, a phase B current limiting resistor R6 and a phase C current limiting resistor R9 are respectively20、R21、R22The resistance values of the conversion resistor R20, the filter resistor R21 and the voltage dividing resistor R22 are respectively.
CN201811446109.2A 2018-11-29 2018-11-29 Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control Active CN109672139B (en)

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