CN109672431B - Three-phase alternating current solid-state relay circuit with leakage protection - Google Patents

Three-phase alternating current solid-state relay circuit with leakage protection Download PDF

Info

Publication number
CN109672431B
CN109672431B CN201811444608.8A CN201811444608A CN109672431B CN 109672431 B CN109672431 B CN 109672431B CN 201811444608 A CN201811444608 A CN 201811444608A CN 109672431 B CN109672431 B CN 109672431B
Authority
CN
China
Prior art keywords
phase
resistor
optical coupler
capacitor
protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811444608.8A
Other languages
Chinese (zh)
Other versions
CN109672431A (en
Inventor
暨仲明
陈德传
贾曦晨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongguan Yongneng Electronics Co ltd
Dragon Totem Technology Hefei Co ltd
Original Assignee
Hangzhou Dianzi University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Dianzi University filed Critical Hangzhou Dianzi University
Priority to CN201811444608.8A priority Critical patent/CN109672431B/en
Publication of CN109672431A publication Critical patent/CN109672431A/en
Application granted granted Critical
Publication of CN109672431B publication Critical patent/CN109672431B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08124—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in thyristor switches
    • 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
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents

Abstract

The invention relates to a three-phase alternating current solid-state relay circuit with leakage protection. The circuit comprises an optical isolation type three-phase alternating current TRIAC driving circuit and a three-phase electric leakage measurement and control circuit. The photoelectric conversion circuit specifically comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, a reverse-resistance type thyristor VT1, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, a residual current sensor SC1, a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4 and the like. The invention takes three optocouplers, three bidirectional thyristors, a reverse resistance type thyristor, a residual current sensor and the like with the output side as the semiconductor alternating current switch as the main simple circuit scheme, and can completely meet the reliable real-time protection requirement on the leakage fault in the three-phase alternating current solid-state relay and the load circuit thereof. The circuit is simple, low in cost, high in reliability, good in universality and easy to produce.

Description

Three-phase alternating current solid-state relay circuit with leakage protection
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 electric leakage protection, and is suitable for the application occasions of contactless switch control in a three-phase alternating current power supply or driving circuit which requires electric leakage protection.
Background
Contactless solid-state relays are increasingly used because of their advantages of no mechanical contacts, fast response, long life, etc. Especially in three-phase alternating current power supply and three-phase alternating current drive circuits, the requirement on leakage protection is higher and higher, when three-phase alternating current leakage occurs, safety protection can be timely carried out so as to avoid personal safety accidents, and the requirement on real-time performance of protection actions is high. However, the existing three-phase ac solid-state relay using a TRIAC (TRIAC) as a power control device lacks a product with a reliable self-protection function for leakage faults. Therefore, how to design a scheme of the three-phase alternating-current solid-state relay which can timely and reliably protect the three-phase alternating-current electric leakage, has a simple circuit and is easy to produce 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 leakage protection, aiming at the defects in the prior art. The circuit consists of a light-blocking type three-phase alternating current TRIAC drive circuit and a three-phase leakage control circuit, and is characterized in that each phase takes a bidirectional Thyristor (TRIAC) as a power control device, a residual current sensor is configured, and a reverse resistance type thyristor is taken as a protection control device, so that the circuit can be reliably turned off and protected when a three-phase alternating current load leaks electricity.
The circuit comprises an optical isolation type three-phase alternating current TRIAC driving circuit and a three-phase electric leakage measurement and control circuit.
The light-isolation type three-phase alternating current TRIAC drive circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, an A-phase drive capacitor C1, an A-phase protection capacitor C2, a B-phase drive capacitor C3, a B-phase protection capacitor C4, a C-phase drive capacitor C5, a C-phase protection capacitor C6, a current-limiting resistor R1A phase left resistor R2, A phase right resistor R3, A phase gate resistor R4, A phase protection resistor R5, B phase left resistor R6, B phase right resistor R7, B phase gate resistor R8, B phase protection resistor R9, C phase left resistor R10, C phase right resistor R11, C phase gate resistor R12, C phase protection resistor R13, A phase Load-A, B phase Load-B, C phase Load-C, the positive driving end IN + end is connected with one end of a current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected with the anode of the light-emitting side of an A-phase optical coupler IC1 and the anode of a reverse-resistance type thyristor VT1, the cathode of the light-emitting side of the A-phase optical coupler IC1 is connected with the anode of the light-emitting side of a B-phase optical coupler IC2, the cathode of the light-emitting side of the B-phase optical coupler IC2 is connected with the anode of the light-emitting side of a C-phase optical coupler IC3, and the cathode of the light-emitting side of the C-phase optical coupler IC3 is connected with the cathode of the reverse-resistance type thyristor VT1 and the negative driving end IN-.
One end of the output side of the A-phase optical coupler IC1 is connected with one end of the A-phase left resistor R2, 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 R4 and the gate of the A-phase bidirectional thyristor VT2, a connecting line of the A-phase end A of an alternating current power supply passes through a detection hole of the residual current sensor CS1 and then is connected with the 1 st anode of the A-phase bidirectional thyristor VT2, one end of the A-phase right resistor R3 and one end of the A-phase protection resistor R5, the other end of the A-phase right resistor R3 is connected with the other end of the A-phase left resistor R2 and one end of the A-phase driving capacitor C1, the 2 nd anode of the A-phase bidirectional thyristor VT2 is connected with the other end of the A-phase gate resistor R4, the other end of the A-phase driving capacitor C1 and one end of the A-phase protection capacitor C2 and then is connected with one end of the A-phase Load-A, the other end of the A-phase Load-A-phase protection capacitor C2 is connected with the other end of the A-phase gate resistor R5 and then passes through a detection hole of the residual current sensor.
One end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase left resistor R6, the other end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase gate resistor R8 and a gate of a B-phase bidirectional thyristor VT2, a B-phase end B-end connecting line of an alternating current power supply passes through a detection hole of a residual current sensor CS1 and then is connected with a 1 st anode of the B-phase bidirectional thyristor VT3, one end of a B-phase right resistor R7 and one end of a B-phase protection resistor R9, the other end of the B-phase right resistor R7 is connected with the other end of the B-phase left resistor R6 and one end of a B-phase driving capacitor C3, a 2 nd anode of the B-phase bidirectional thyristor VT3 is connected with the other end of the B-phase gate resistor R8, the other end of the B-phase driving capacitor C3 and one end of a B-phase protection capacitor C4 and then is connected with the other end of a B-phase Load-B, and the other end of the B-phase protection resistor R9.
One end of the output side of the C-phase optical coupler IC3 is connected with one end of a C-phase left resistor R10, 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 R12 and a gate of a C-phase bidirectional thyristor VT4, a C-phase end C-end connecting line of an alternating current power supply penetrates through a detection hole of the residual current sensor CS1 and then is connected with the 1 st anode of the C-phase bidirectional thyristor VT4, one end of a C-phase right resistor R11 and one end of a C-phase protection resistor R13, the other end of the C-phase right resistor R11 is connected with the other end of the C-phase left resistor R10 and one end of a C-phase driving capacitor C5, the 2 nd anode of the C-phase bidirectional thyristor VT4 is connected with the other end of the C-phase gate resistor R12, the other end of the C-phase driving capacitor C5 and one end of a C-phase protection capacitor C6 and then is connected with the other end of a C-phase Load-C, and the other end of the C-phase protection resistor R13.
The three-phase electric leakage measurement and control circuit comprises a reverse resistance type thyristor VT1, a residual current sensor SC1, a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4, a conversion resistor R14, a filter resistor R15, a divider resistor R16 and a filter capacitor C7, wherein the 1 st output end I1 of the residual current sensor SC1 is connected with the anode of the left positive diode D1 and the cathode of the left negative diode D2, the 2 nd output end I2 of the residual current sensor SC1 is connected with the anode of the right positive diode D3 and the cathode of the right negative diode D4, the cathode of the left positive diode D1 is connected with the cathode of the right positive diode D3, one end of the conversion resistor R14 and one end of the filter resistor R15, the other end of the filter resistor R15 is connected with one end of the divider resistor R16, one end of the filter capacitor C7 and the gate of the reverse resistance type thyristor VT1, and the anode of the left negative diode D2 is connected with the cathode of the right negative diode D4, the other end of the conversion resistor R14, the other end of the divider capacitor C7, the drive end of the IN 16 and the negative resistor R16.
The invention has the following beneficial effects:
the invention takes three optocouplers, three bidirectional Thyristors (TRIAC), a reverse resistance type thyristor, a residual current sensor and the like with the output side as the semiconductor alternating current switch as the main simple circuit scheme, and can completely meet the reliable real-time protection requirement on the leakage fault in the three-phase alternating current solid-state relay and the load circuit thereof. 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, a three-phase ac solid-state relay circuit with leakage protection includes an optical isolation type three-phase ac TRIAC driving circuit and a three-phase leakage measurement and control circuit.
The light-isolation type three-phase alternating current TRIAC drive circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, an A-phase drive capacitor C1, an A-phase protection capacitor C2, a B-phase drive capacitor C3, a B-phase protection capacitor C4, a C-phase drive capacitor C5, a C-phase protection capacitor C6, a current-limiting resistor R1A phase left resistor R2, A phase right resistor R3, A phase gate resistor R4, A phase protection resistor R5, B phase left resistor R6, B phase right resistor R7, B phase gate resistor R8, B phase protection resistor R9, C phase left resistor R10, C phase right resistor R11, C phase gate resistor R12, C phase protection resistor R13, A phase Load-A, B phase Load-B, C phase Load-C, the positive driving end IN + end is connected with one end of a current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected with the anode of the light-emitting side of an A-phase optical coupler IC1 and the anode of a reverse-resistance type thyristor VT1, the cathode of the light-emitting side of the A-phase optical coupler IC1 is connected with the anode of the light-emitting side of a B-phase optical coupler IC2, the cathode of the light-emitting side of the B-phase optical coupler IC2 is connected with the anode of the light-emitting side of a C-phase optical coupler IC3, and the cathode of the light-emitting side of the C-phase optical coupler IC3 is connected with the cathode of the reverse-resistance type thyristor VT1 and the negative driving end IN-.
One end of the output side of the A-phase optical coupler IC1 is connected with one end of the A-phase left resistor R2, 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 R4 and the gate of the A-phase bidirectional thyristor VT2, a connecting line of the A-phase end A of an alternating current power supply passes through a detection hole of the residual current sensor CS1 and then is connected with the 1 st anode of the A-phase bidirectional thyristor VT2, one end of the A-phase right resistor R3 and one end of the A-phase protection resistor R5, the other end of the A-phase right resistor R3 is connected with the other end of the A-phase left resistor R2 and one end of the A-phase driving capacitor C1, the 2 nd anode of the A-phase bidirectional thyristor VT2 is connected with the other end of the A-phase gate resistor R4, the other end of the A-phase driving capacitor C1 and one end of the A-phase protection capacitor C2 and then is connected with one end of the A-phase Load-A, the other end of the A-phase Load-A-phase protection capacitor C2 is connected with the other end of the A-phase gate resistor R5 and then passes through a detection hole of the residual current sensor.
One end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase left resistor R6, the other end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase gate resistor R8 and a gate of a B-phase bidirectional thyristor VT2, a B-phase end B-end connecting line of an alternating current power supply passes through a detection hole of a residual current sensor CS1 and then is connected with a 1 st anode of the B-phase bidirectional thyristor VT3, one end of a B-phase right resistor R7 and one end of a B-phase protection resistor R9, the other end of the B-phase right resistor R7 is connected with the other end of the B-phase left resistor R6 and one end of a B-phase driving capacitor C3, a 2 nd anode of the B-phase bidirectional thyristor VT3 is connected with the other end of the B-phase gate resistor R8, the other end of the B-phase driving capacitor C3 and one end of a B-phase protection capacitor C4 and then is connected with the other end of a B-phase Load-B, and the other end of the B-phase protection resistor R9.
One end of the output side of the C-phase optical coupler IC3 is connected with one end of a C-phase left resistor R10, 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 R12 and a gate of a C-phase bidirectional thyristor VT4, a C-phase end C-end connecting line of an alternating current power supply penetrates through a detection hole of the residual current sensor CS1 and then is connected with the 1 st anode of the C-phase bidirectional thyristor VT4, one end of a C-phase right resistor R11 and one end of a C-phase protection resistor R13, the other end of the C-phase right resistor R11 is connected with the other end of the C-phase left resistor R10 and one end of a C-phase driving capacitor C5, the 2 nd anode of the C-phase bidirectional thyristor VT4 is connected with the other end of the C-phase gate resistor R12, the other end of the C-phase driving capacitor C5 and one end of a C-phase protection capacitor C6 and then is connected with the other end of a C-phase Load-C, and the other end of the C-phase protection resistor R13.
The three-phase electric leakage measurement and control circuit comprises a reverse resistance type thyristor VT1, a residual current sensor SC1, a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4, a conversion resistor R14, a filter resistor R15, a divider resistor R16 and a filter capacitor C7, wherein the 1 st output end I1 of the residual current sensor SC1 is connected with the anode of the left positive diode D1 and the cathode of the left negative diode D2, the 2 nd output end I2 of the residual current sensor SC1 is connected with the anode of the right positive diode D3 and the cathode of the right negative diode D4, the cathode of the left positive diode D1 is connected with the cathode of the right positive diode D3, one end of the conversion resistor R14 and one end of the filter resistor R15, the other end of the filter resistor R15 is connected with one end of the divider resistor R16, one end of the filter capacitor C7 and the gate of the reverse resistance type thyristor VT1, and the anode of the left negative diode D2 is connected with the cathode of the right negative diode D4, the other end of the conversion resistor R14, the other end of the divider capacitor C7, the drive end of the IN 16 and the negative resistor R16.
All the devices used by the invention, including an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, a residual current sensor SC1, a reverse resistance type thyristor VT1, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4 and the like, are all existing mature products and can be obtained through the market. For example: the opto-coupler adopts MOC3083, the residual current sensor adopts an LJ series zero sequence current sensor, 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: u shape gTH The measured leakage current and output current of the residual current sensor are respectively I 0 、I 2 (unit: A), the current ratio of the residual current sensor is k i ＝I 2 /I 0 Order: i is 0m For allowable leakage current I to be detected 0 A, then:
R 15 ＞＞R 14 (1)
Figure BDA0001885428130000061
in the formula 14 、R 15 、R 16 The resistance values (unit: omega) of the conversion resistor R14, the filter resistor R15 and the voltage dividing resistor R16 are respectively.
The working process of the invention is as follows:
(1) The light-isolation type three-phase alternating current TRIAC drive circuit has the following functions: the circuit has a photoelectric isolation function, and the light-emitting control side of the optocoupler IC1 is a voltage control circuit. The positive driving end IN + of the circuit is connected with the positive end of driving voltage, the negative driving end IN-is connected with the negative end of the driving voltage, and the resistance value of the current limiting resistor R1 is configured according to the rated current of the light emitting side of the optical coupler. IN general application, the positive driving end IN + can be connected with a power supply voltage end of a superior control circuit, the negative driving end IN-end is used as a switch control end of the superior control circuit, when the control end is IN a low level, all three optocouplers are conducted, and then the three bidirectional thyristors are conducted to supply power to a three-phase alternating current load; when the control end is at a high level, the three optocouplers are all turned off, so that the three bidirectional thyristors are turned off, and the three-phase alternating current load is powered off.
(2) Three-phase electric leakage measurement and control protection function: in the circuit, the residual current sensor SC1 is adopted to monitor the leakage current in the three-phase alternating current load circuit in real time, and once the leakage current reaches I 0m In the circuit parameter coordination of the formula (1) and the formula (2), and under the action of a rectifying circuit, a filtering circuit, a voltage dividing circuit and the like which mainly comprise a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4, a converting resistor R14, a filtering resistor R15, a voltage dividing resistor R16 and a filtering capacitor C7, the reverse-resistance thyristor VT1 is switched on, so that the A-phase bidirectional thyristor VT2, the B-phase bidirectional thyristor VT3 and the C-phase bidirectional thyristor VT4 are switched off, and the A-phase bidirectional thyristor VT2, the B-phase bidirectional thyristor VT3 and the C-phase bidirectional thyristor VT4 are always switched off before power failure restart work is not carried out after the switching off, thereby having the safe and reliable protection control function on the leakage of the three-phase alternating-current load circuit.

Claims (2)

1. The utility model provides a three-phase exchanges solid state relay circuit with earth leakage protection, includes light-insulated formula three-phase alternating current TRIAC drive circuit, three-phase electric leakage measurement and control circuit, characterized in that:
the light-isolation type three-phase alternating current TRIAC drive circuit comprises an A-phase optical coupler IC1, a B-phase optical coupler IC2, a C-phase optical coupler IC3, an A-phase bidirectional thyristor VT2, a B-phase bidirectional thyristor VT3, a C-phase bidirectional thyristor VT4, an A-phase drive capacitor C1, an A-phase protection capacitor C2, a B-phase drive capacitor C3, a B-phase protection capacitor C4, a C-phase drive capacitor C5, a C-phase protection capacitor C6, a current-limiting resistor R1A phase left resistor R2, A phase right resistor R3, A phase gate resistor R4, A phase protection resistor R5, B phase left resistor R6, B phase right resistor R7, B phase gate resistor R8, B phase protection resistor R9, C phase left resistor R10, C phase right resistor R11, C phase gate resistor R12, C phase protection resistor R13, A phase Load-A, B phase Load-B, C phase Load-C, the positive driving end IN + end is connected with one end of a current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected with the anode of the light-emitting side of an A-phase optical coupler IC1 and the anode of a reverse-resistance type thyristor VT1, the cathode of the light-emitting side of the A-phase optical coupler IC1 is connected with the anode of the light-emitting side of a B-phase optical coupler IC2, the cathode of the light-emitting side of the B-phase optical coupler IC2 is connected with the anode of the light-emitting side of a C-phase optical coupler IC3, and the cathode of the light-emitting side of the C-phase optical coupler IC3 is connected with the cathode of the reverse-resistance type thyristor VT1 and the negative driving end IN-;
one end of the output side of the phase A optical coupler IC1 is connected with one end of a phase A left resistor R2, the other end of the output side of the phase A optical coupler IC1 is connected with one end of a phase A gate resistor R4 and a gate of a phase A bidirectional thyristor VT2, an A end A connection line of a phase A end of an alternating current power supply passes through a detection hole of a residual current sensor CS1 and then is connected with a 1 st anode of the phase A bidirectional thyristor VT2, one end of a phase A right resistor R3 and one end of a phase A protection resistor R5, the other end of the phase A right resistor R3 is connected with the other end of the phase A left resistor R2 and one end of a phase A driving capacitor C1, a 2 nd anode of the phase A bidirectional thyristor VT2 is connected with the other end of the phase A gate resistor R4, the other end of the phase A driving capacitor C1 and one end of the phase A protection capacitor C2 and then is connected with one end of a phase A Load-A, the other end of the phase A protection capacitor C2 is connected with the other end of the phase A protection resistor R5, and the other end of the phase A Load-B, one end of the phase Load-C is connected with a zero line of the residual current sensor after passing through a detection hole of the alternating current sensor N;
one end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase left resistor R6, the other end of the output side of the B-phase optical coupler IC2 is connected with one end of a B-phase gate resistor R8 and a gate of a B-phase bidirectional thyristor VT2, a B-phase end B-end connecting wire of an alternating current power supply penetrates through a detection hole of a residual current sensor CS1 and then is connected with a 1 st anode of the B-phase bidirectional thyristor VT3, one end of a B-phase right resistor R7 and one end of a B-phase protection resistor R9, the other end of the B-phase right resistor R7 is connected with the other end of the B-phase left resistor R6 and one end of a B-phase driving capacitor C3, a 2 nd anode of the B-phase bidirectional thyristor VT3 is connected with the other end of the B-phase gate resistor R8, the other end of the B-phase driving capacitor C3 and one end of a B-phase protection capacitor C4 and then is connected with the other end of a B-phase Load-B, and the other end of the B-phase protection resistor R9;
one end of the output side of the C-phase optical coupler IC3 is connected with one end of a C-phase left resistor R10, 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 R12 and a gate of a C-phase bidirectional thyristor VT4, a C-phase end C-end connecting wire of an alternating current power supply penetrates through a detection hole of the residual current sensor CS1 and then is connected with the 1 st anode of the C-phase bidirectional thyristor VT4, one end of a C-phase right resistor R11 and one end of a C-phase protection resistor R13, the other end of the C-phase right resistor R11 is connected with the other end of the C-phase left resistor R10 and one end of a C-phase driving capacitor C5, the 2 nd anode of the C-phase bidirectional thyristor VT4 is connected with the other end of the C-phase gate resistor R12, the other end of the C-phase driving capacitor C5 and one end of a C-phase protection capacitor C6 and then is connected with the other end of a C-phase Load-C, and the other end of the C-phase protection resistor R13;
the three-phase electric leakage measurement and control circuit comprises a reverse resistance type thyristor VT1, a residual current sensor SC1, a left positive diode D1, a left negative diode D2, a right positive diode D3, a right negative diode D4, a conversion resistor R14, a filter resistor R15, a divider resistor R16 and a filter capacitor C7, wherein the 1 st output end I1 of the residual current sensor SC1 is connected with the anode of the left positive diode D1 and the cathode of the left negative diode D2, the 2 nd output end I2 of the residual current sensor SC1 is connected with the anode of the right positive diode D3 and the cathode of the right negative diode D4, the cathode of the left positive diode D1 is connected with the cathode of the right positive diode D3, one end of the conversion resistor R14 and one end of the filter resistor R15, the other end of the filter resistor R15 is connected with one end of the divider resistor R16, one end of the filter capacitor C7 and the gate of the reverse resistance type thyristor VT1, and the anode of the left negative diode D2 is connected with the cathode of the right negative diode D4, the other end of the conversion resistor R14, the other end of the divider capacitor C7, the drive end of the IN 16 and the negative resistor R16.
2. A three-phase ac solid-state relay circuit with earth leakage protection as claimed in claim 1, wherein the circuit parameters are in the following relationship:
setting: u shape gTH The measured leakage current and the output current of the residual current sensor are respectively I 0 、I 2 The ratio of the currents of the residual current sensors is k i ＝I 2 /I 0 Order: i is 0m For allowable leakage current I to be detected 0 Then:
R 15 ＞＞R 14 (1)
Figure FDA0003832039180000031
in the formula 14 、R 15 、R 16 The resistance values of the conversion resistor R14, the filter resistor R15 and the divider resistor R16 are respectively.
CN201811444608.8A 2018-11-29 2018-11-29 Three-phase alternating current solid-state relay circuit with leakage protection Active CN109672431B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811444608.8A CN109672431B (en) 2018-11-29 2018-11-29 Three-phase alternating current solid-state relay circuit with leakage protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811444608.8A CN109672431B (en) 2018-11-29 2018-11-29 Three-phase alternating current solid-state relay circuit with leakage protection

Publications (2)

Publication Number Publication Date
CN109672431A CN109672431A (en) 2019-04-23
CN109672431B true CN109672431B (en) 2022-11-15

Family

ID=66143410

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811444608.8A Active CN109672431B (en) 2018-11-29 2018-11-29 Three-phase alternating current solid-state relay circuit with leakage protection

Country Status (1)

Country Link
CN (1) CN109672431B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3116124B1 (en) * 2020-11-09 2022-10-14 Safran Electrical & Power POWER CIRCUIT MONITORING AND PROTECTION DEVICES
CN113820625A (en) * 2021-10-13 2021-12-21 上海电气泰雷兹交通自动化系统有限公司 Circuit for detecting leakage current of alternating current solid-state relay

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103956708A (en) * 2014-04-21 2014-07-30 杭州电子科技大学 Overload measurement and control circuit for low-voltage direct current load
CN203775096U (en) * 2014-01-26 2014-08-13 杭州电子科技大学 DC motor driving and protecting circuit
CN205566256U (en) * 2016-04-18 2016-09-07 象山艾尔沃特智能科技有限公司 Alternating load isolation control circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203775096U (en) * 2014-01-26 2014-08-13 杭州电子科技大学 DC motor driving and protecting circuit
CN103956708A (en) * 2014-04-21 2014-07-30 杭州电子科技大学 Overload measurement and control circuit for low-voltage direct current load
CN205566256U (en) * 2016-04-18 2016-09-07 象山艾尔沃特智能科技有限公司 Alternating load isolation control circuit

Also Published As

Publication number Publication date
CN109672431A (en) 2019-04-23

Similar Documents

Publication Publication Date Title
CN201590645U (en) AC input over-voltage and under-voltage protection device for electric apparatus
CN109672431B (en) Three-phase alternating current solid-state relay circuit with leakage protection
CN109672430B (en) Three-phase alternating current solid-state relay circuit with leakage protection and wide voltage control
CN109510613B (en) Three-phase alternating-current solid-state relay circuit with short-circuit protection
CN202949231U (en) Intelligent zero-crossing switching silicon controlled combination switch
CN204243716U (en) Electric device fault secure circuit
CN109672144B (en) single-phase AC solid-state relay circuit with earth leakage protection
CN109672139B (en) Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control
CN102957157B (en) Silicon controlled composite switch of intelligent zero-crossing switching
CN204706895U (en) Fossil power plant auxiliary engine frequency converter high-low voltage traversing device
CN103023044B (en) Combination switch with intelligent zero-crossing switching function
CN203086328U (en) Intelligent power grid terminal power input surge suppression circuit
CN109672435B (en) Single-phase alternating current solid-state relay circuit with short-circuit protection
CN205429697U (en) Type B residual current operated circuit breaker
CN211405896U (en) Motor safe operation circuit
CN109672433B (en) IGBT high-voltage direct-current solid-state relay circuit with short-circuit protection
CN106711956A (en) Over-voltage and under-voltage protective circuit
CN109672432B (en) MOSFET direct current solid state relay circuit with short-circuit protection
CN202997524U (en) Intelligent universal type three phase protector
CN204696962U (en) A kind of starting of three phases motor controller
CN204538652U (en) A kind of low-voltage customer over-and under-voltage circuit breaker
CN210007643U (en) Anti-interference circuit of motor protector
CN205232068U (en) Starting protection circuit of single phase alternating current load
CN202978691U (en) Series resistor coupling circuit applied to low-voltage frequency converter over-voltage protection circuit
CN210224929U (en) Photovoltaic reclosing module circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20230720

Address after: 523000 building 27, Shiyong private industrial zone, Hengli Town, Dongguan City, Guangdong Province

Patentee after: DONGGUAN YONGNENG ELECTRONICS CO.,LTD.

Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province

Patentee before: Dragon totem Technology (Hefei) Co.,Ltd.

Effective date of registration: 20230720

Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province

Patentee after: Dragon totem Technology (Hefei) Co.,Ltd.

Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang

Patentee before: HANGZHOU DIANZI University