CN107959488B - Solid-state relay circuit with short-circuit protection - Google Patents
Solid-state relay circuit with short-circuit protection Download PDFInfo
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- CN107959488B CN107959488B CN201711210612.3A CN201711210612A CN107959488B CN 107959488 B CN107959488 B CN 107959488B CN 201711210612 A CN201711210612 A CN 201711210612A CN 107959488 B CN107959488 B CN 107959488B
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- resistor
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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
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0824—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in thyristor switches
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Abstract
The invention discloses the technical field of solid-state relay circuits, in particular to a solid-state relay circuit with short-circuit protection, which comprises an input circuit, a control circuit, a zero crossing circuit, an output circuit, an absorption circuit, a short-circuit protection circuit and a sampling circuit.
Description
Technical Field
The invention discloses the technical field of solid-state relay circuits, and particularly discloses a solid-state relay circuit with short-circuit protection.
Background
The traditional solid-state relay used in the market has no short-circuit protection function, when the external load has a problem and causes the overlarge current, the damage of the solid-state relay is often caused, the general method is to connect a circuit breaker in series on a line as a protector of the line, but each line is connected with a circuit breaker in series, the circuit breaker is not only costly, but also has a very large effect because the circuit breaker has a purely mechanical structure and has a relatively slow reaction speed, so that the solid-state relay is permanently damaged and cannot be reused after the circuit breaker breaks the circuit.
Disclosure of Invention
Therefore, the invention aims to provide a solid-state relay circuit with short-circuit protection, which has the advantages of high outage speed, prolonged service life and reduced cost.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the solid-state relay circuit with the short-circuit protection comprises an input circuit, a control circuit, a zero crossing circuit, an output circuit, an absorption circuit, a short-circuit protection circuit and a sampling circuit, wherein the input circuit comprises an interface J1, a third resistor R3, a second resistor R2, a triode T2A, a first resistor R1, a third capacitor C3, a second capacitor C2, a diode D1 and a first capacitor C1, the end 1 of the interface J1 is connected with the cathode of the diode D1, the end 2 of the interface J1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the second resistor R2, the anode of the diode D1 is respectively connected with one end of the second capacitor C2 and the end 1 of the triode T2A and then grounded, the other end of the second capacitor C2 is connected with the other end 6 of the triode T2A and then connected with the other end of the second resistor R2, the end 2A is connected with the first resistor R1, the end 3 is connected with the first resistor C1 in parallel with the first resistor R1 and the two ends of the diode D1;
the control circuit consists of a fourth resistor R4, a luminous tube LED, a triode T1, a fifth resistor R5 and a light lotus root DP2, wherein the end 1 of the light lotus root DP2 is connected with one end of the fifth resistor R5, the fourth resistor R4 is connected with the positive electrode of the luminous tube LED, the negative electrode of the luminous tube LED and the collector electrode of the triode T1 are connected with the end 2 of the light lotus root DP2, the base electrode of the triode T1 is connected with the other end of the second resistor R2, and the emitter electrode of the triode T1 is connected with one end of the first resistor R1;
the zero crossing circuit is composed of an eighth resistor R8 and an eleventh resistor R11, one end of the eleventh resistor R11 is connected with the No. 4 end of the optical coupler DP2, and one end of the eighth resistor R8 is connected with the No. 3 end of the optical coupler DP 2;
the output circuit comprises a bidirectional thyristor TR1, wherein a No. 1 end of the bidirectional thyristor TR1 is connected between a No. 4 end of the optical coupler DP2 and one end of the eleventh resistor R11, a No. 2 end of the bidirectional thyristor TR1 is connected with the other end of the eleventh resistor R11, and a No. 3 end of the bidirectional thyristor TR1 is connected with the other end of the eighth resistor R8;
the absorption circuit is composed of a tenth resistor R10, a sixteenth capacitor C16 and a first capacitor E1, wherein one end of the first capacitor E1 is connected with one end of the tenth resistor R10, one end of the tenth resistor R10 is connected with the No. 3 end of the bidirectional thyristor TR1, the other end of the first capacitor E1 is connected with one end of the sixteenth capacitor C16, one end of the sixteenth capacitor C16 is connected with the No. 2 end of the bidirectional thyristor TR1, and the other end of the sixteenth capacitor C16 is connected with the other end of the tenth resistor R10;
the short-circuit protection circuit is composed of a fourth capacitor C4, a sixth resistor R6, a bidirectional triode Q3, a thirteenth resistor R13, a triode T2B, a light emitting diode LED1, a seventh resistor, a triode T3 and a ninth resistor R9, wherein one end of the capacitor C4 is respectively connected with the No. 3 end of the bidirectional triode Q3 and one end of the sixth resistor R6, one end of the capacitor C4 is grounded, the other end of the sixth resistor R6 is connected with a collector electrode of the triode T3, a base electrode of the triode T3 is connected with one end of the ninth resistor R9, an emitter electrode of the triode T3 is connected with the No. 2 end of the bidirectional triode Q3, the No. 2 end of the bidirectional triode Q3 is connected with the other end of the fifth resistor R5, the No. 1 end of the bidirectional triode Q3 is connected with one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with the No. 5 end of the triode T2B, the No. 3 end of the triode T2B is connected with the No. 6 end of the triode T2A, the No. 4 is connected with the anode of the triode T2A, and the anode of the triode T3 is connected with the anode of the bidirectional triode Q3, and the anode of the triode Q3 is connected with the anode of the bidirectional triode Q3;
the sampling circuit is composed of a twelfth resistor R12, a fifth capacitor C5 and a sensor J3, wherein the No. 1 end of the sensor J3 is connected with one end of the twelfth resistor R12, the twelfth resistor R12 is connected with the emitter of the triode T3, the No. 2 end of the sensor J3 is grounded, the No. 3 end of the sensor J3 is connected between the twelfth resistor R12 and the fifth capacitor C5, the other end of the twelfth resistor R12 is connected with one end of the fifth capacitor C5, one end of the fifth capacitor C5 is connected with the other end of the ninth resistor R9, and the other end of the fifth capacitor C5 is grounded.
Compared with the prior art, the invention has the beneficial technical effects that: according to the invention, by adding the short-circuit protection circuit and the sampling circuit, the bidirectional thyristor Q3 in the short-circuit protection circuit has the characteristics of quick power-off reaction and capability of being turned on or off within microsecond, so that the components and the loads on the circuits in the protection circuit are prevented from being lost, the power-off speed is high, and the output circuit comprises the bidirectional thyristor TR1, so that when the load of the solid-state relay is short-circuited or damaged, the bidirectional thyristor TR1 in the output circuit is timely turned off, the service life is prolonged, and the cost is reduced.
Drawings
Fig. 1: the invention is a circuit schematic diagram.
Wherein: 1-an input circuit; 2-a control circuit; 3-zero crossing circuit; a 4-output circuit; a 5-absorption circuit; 6-a short-circuit protection circuit; 7-sampling circuit.
Detailed Description
The following detailed description of the invention is provided in connection with the accompanying drawings to facilitate understanding and grasping of the technical scheme of the invention.
As shown in fig. 1, the solid-state relay circuit with short-circuit protection comprises an input circuit 1, a control circuit 2, a zero crossing circuit 3, an output circuit 4, an absorption circuit 5, a short-circuit protection circuit 6 and a sampling circuit 7, wherein the input circuit 1 is composed of an interface J1, a third resistor R3, a second resistor R2, a triode T2A, a first resistor R1, a third capacitor C3, a second capacitor C2, a diode D1 and a first capacitor C1, the end 1 of the interface J1 is connected with the cathode of the diode D1, the end 2 of the interface J1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the second resistor R2, the positive electrode of the diode D1 is respectively connected with one end 1 of the second capacitor C2 and then grounded, the other end of the second capacitor C2 is connected with the other end 6 of the triode T2A and then connected with the other end 2 of the second resistor, the end 2 of the triode T2A is connected with the end 2, the end 2 of the first resistor R1 is connected with the first resistor C1 in parallel with the two ends of the triode T1, and the two ends of the triode C1 are connected with the two ends of the diode C1 in parallel;
the control circuit 2 consists of a fourth resistor R4, a luminous tube LED, a triode T1, a fifth resistor R5 and a light lotus root DP2, wherein the end 1 of the light lotus root DP2 is connected with one end of the fifth resistor R5, the fourth resistor R4 is connected with the positive electrode of the luminous tube LED, the negative electrode of the luminous tube LED and the collector electrode of the triode T1 are connected with the end 2 of the light lotus root DP2, the base electrode of the triode T1 is connected with the other end of the second resistor R2, and the emitter electrode of the triode T1 is connected with one end of the first resistor R1;
the zero crossing circuit 3 is composed of an eighth resistor R8 and an eleventh resistor R11, one end of the eleventh resistor R11 is connected with the No. 4 end of the optical coupler DP2, and one end of the eighth resistor R8 is connected with the No. 3 end of the optical coupler DP 2;
the output circuit 4 includes a bidirectional thyristor TR1, a No. 1 end of the bidirectional thyristor TR1 is connected between a No. 4 end of the optical coupler DP2 and a No. 11 end of the eleventh resistor R11, a No. 2 end of the bidirectional thyristor TR1 is connected to the other end of the eleventh resistor R11, and a No. 3 end of the bidirectional thyristor TR1 is connected to the other end of the eighth resistor R8;
the absorption circuit 5 is composed of a tenth resistor R10, a sixteenth capacitor C16 and a first capacitor E1, wherein one end of the first capacitor E1 is connected with one end of the tenth resistor R10, one end of the tenth resistor R10 is connected with the No. 3 end of the triac TR1, the other end of the first capacitor E1 is connected with one end of the sixteenth capacitor C16, one end of the sixteenth capacitor C16 is connected with the No. 2 end of the triac TR1, and the other end of the sixteenth capacitor C16 is connected with the other end of the tenth resistor R10;
the short-circuit protection circuit 6 is composed of a fourth capacitor C4, a sixth resistor R6, a bidirectional triode Q3, a thirteenth resistor R13, a triode T2B, a light emitting diode LED1, a seventh resistor, a triode T3 and a ninth resistor R9, wherein one end of the capacitor C4 is respectively connected with the No. 3 end of the bidirectional triode Q3 and one end of the sixth resistor R6, one end of the capacitor C4 is grounded, the other end of the sixth resistor R6 is connected with a collector electrode of the triode T3, a base electrode of the triode T3 is connected with one end of the ninth resistor R9, an emitter electrode of the triode T3 is connected with the No. 2 end of the bidirectional triode Q3, the No. 2 end of the bidirectional triode Q3 is connected with the other end of the fifth resistor R5, the No. 1 end of the bidirectional triode Q3 is connected with one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with the No. 5 end of the triode T2B, the No. 3 end of the triode T2B is connected with the No. 6 end of the triode T2A, the No. 4 is connected with the anode of the triode T2A, and the anode of the triode T3 is connected with the anode of the bidirectional triode Q3, and the anode of the triode Q3 is connected with the bidirectional triode Q3;
the sampling circuit 7 is composed of a twelfth resistor R12, a fifth capacitor C5 and a sensor J3, wherein the No. 1 end of the sensor J3 is connected with one end of the twelfth resistor R12, the twelfth resistor R12 is connected with the emitter of the triode T3, the No. 2 end of the sensor J3 is grounded, the No. 3 end of the sensor J3 is connected between the twelfth resistor R12 and the fifth capacitor C5, the other end of the twelfth resistor R12 is connected with one end of the fifth capacitor C5, one end of the fifth capacitor C5 is connected with the other end of the ninth resistor R9, and the other end of the fifth capacitor C5 is grounded.
When the load of the absorption circuit is overlarge and exceeds the bearing range of the output circuit during the short-circuit protection operation of the solid-state relay circuit with the short-circuit protection, a sensor adopting the circuit can timely feed back signals to the control circuit, and a bidirectional thyristor Q3 in the short-circuit protection circuit connected with the control circuit protects components on the output circuit.
Of course, the above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the invention.
Claims (1)
1. The solid-state relay circuit with the short-circuit protection comprises an input circuit (1), a control circuit (2), a zero crossing circuit (3), an output circuit (4), an absorption circuit (5), a short-circuit protection circuit (6) and a sampling circuit (7), and is characterized in that the input circuit (1) is composed of an interface J1, a third resistor R3, a second resistor R2, a triode T2A, a first resistor R1, a third capacitor C3, a second capacitor C2, a diode D1 and a first capacitor C1, the end 1 of the interface J1 is connected with the cathode of the diode D1, the end 2 of the interface J1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of the second resistor R2, the anode of the diode D1 is respectively connected with one end of the second capacitor C2 and then grounded, the other end of the second capacitor C2 is connected with the end 6 of the triode T2A and then the other end of the second resistor R2, the end of the triode T2A is connected with the first resistor R1 in parallel with the two ends of the first resistor C1;
the control circuit (2) consists of a fourth resistor R4, a luminous tube LED, a triode T1, a fifth resistor R5 and a light lotus root DP2, wherein the No. 1 end of the light lotus root DP2 is connected with one end of the fifth resistor R5, the fourth resistor R4 is connected with the positive electrode of the luminous tube LED, the negative electrode of the luminous tube LED and the collector electrode of the triode T1 are connected with the No. 2 end of the light lotus root DP2, the base electrode of the triode T1 is connected with the other end of the second resistor R2, and the emitter electrode of the triode T1 is connected with one end of the first resistor R1;
the zero crossing circuit (3) is composed of an eighth resistor R8 and an eleventh resistor R11, one end of the eleventh resistor R11 is connected with the No. 4 end of the optical lotus root DP2, and one end of the eighth resistor R8 is connected with the No. 3 end of the optical lotus root DP 2;
the output circuit (4) comprises a bidirectional thyristor TR1, wherein a No. 1 end of the bidirectional thyristor TR1 is connected between a No. 4 end of the optical coupler DP2 and one end of the eleventh resistor R11, a No. 2 end of the bidirectional thyristor TR1 is connected with the other end of the eleventh resistor R11, and a No. 3 end of the bidirectional thyristor TR1 is connected with the other end of the eighth resistor R8;
the absorption circuit (5) is composed of a tenth resistor R10, a sixteenth capacitor C16 and a first capacitor E1, wherein one end of the first capacitor E1 is connected with one end of the tenth resistor R10, one end of the tenth resistor R10 is connected with the No. 3 end of the bidirectional thyristor TR1, the other end of the first capacitor E1 is connected with one end of the sixteenth capacitor C16, one end of the sixteenth capacitor C16 is connected with the No. 2 end of the bidirectional thyristor TR1, and the other end of the sixteenth capacitor C16 is connected with the other end of the tenth resistor R10;
the short-circuit protection circuit (6) is composed of a fourth capacitor C4, a sixth resistor R6, a bidirectional triode Q3, a thirteenth resistor R13, a triode T2B, a light emitting diode LED1, a seventh resistor, a triode T3 and a ninth resistor R9, wherein one end of the capacitor C4 is respectively connected with the No. 3 end and the No. 6 end of the bidirectional triode Q3, one end of the capacitor C4 is grounded, the other end of the sixth resistor R6 is connected with a collector electrode of the triode T3, a base electrode of the triode T3 is connected with one end of the ninth resistor R9, an emitter electrode of the triode T3 is connected with the No. 2 end of the bidirectional triode Q3, the No. 2 end of the bidirectional triode Q3 is connected with the other end of the fifth resistor R5, the No. 1 end of the bidirectional triode Q3 is connected with one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected with the No. 5 end of the triode T2B, the No. 3 end of the triode T2B is connected with the No. 6 end of the triode T2A, the No. 4 is connected with the anode of the triode T2A, and the anode of the triode T3 is connected with the LED 7, and the anode of the triode Q3 is connected with the LED;
the sampling circuit (7) is composed of a twelfth resistor R12, a fifth capacitor C5 and a sensor J3, wherein the No. 1 end of the sensor J3 is connected with one end of the twelfth resistor R12, the twelfth resistor R12 is connected with the emitter of the triode T3, the No. 2 end of the sensor J3 is grounded, the No. 3 end of the sensor J3 is connected between the twelfth resistor R12 and the fifth capacitor C5, the other end of the twelfth resistor R12 is connected with one end of the fifth capacitor C5, one end of the fifth capacitor C5 is connected with the other end of the ninth resistor R9, and the other end of the fifth capacitor C5 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711210612.3A CN107959488B (en) | 2017-11-28 | 2017-11-28 | Solid-state relay circuit with short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711210612.3A CN107959488B (en) | 2017-11-28 | 2017-11-28 | Solid-state relay circuit with short-circuit protection |
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| Publication Number | Publication Date |
|---|---|
| CN107959488A CN107959488A (en) | 2018-04-24 |
| CN107959488B true CN107959488B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711210612.3A Active CN107959488B (en) | 2017-11-28 | 2017-11-28 | Solid-state relay circuit with short-circuit protection |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672139B (en) * | 2018-11-29 | 2019-12-24 | 杭州电子科技大学 | Three-phase alternating current solid-state relay circuit with short-circuit protection and wide voltage control |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4218718A (en) * | 1978-11-08 | 1980-08-19 | Westinghouse Electric Corp. | Protective relay apparatus |
| CN101034886A (en) * | 2006-03-09 | 2007-09-12 | 展嘉科技股份有限公司 | Electromagnetic coupling solid relay with output feedback |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN104409281A (en) * | 2014-12-12 | 2015-03-11 | 东莞市精诚电能设备有限公司 | Relay-controlled high-current load contact protection circuit |
| CN105826063A (en) * | 2016-05-30 | 2016-08-03 | 东北农业大学 | Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer |
| CN208461795U (en) * | 2017-11-28 | 2019-02-01 | 宁波盈科工业自动化有限公司 | A kind of solid-state relay circuit with short-circuit protection |
-
2017
- 2017-11-28 CN CN201711210612.3A patent/CN107959488B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4218718A (en) * | 1978-11-08 | 1980-08-19 | Westinghouse Electric Corp. | Protective relay apparatus |
| CN101034886A (en) * | 2006-03-09 | 2007-09-12 | 展嘉科技股份有限公司 | Electromagnetic coupling solid relay with output feedback |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN104409281A (en) * | 2014-12-12 | 2015-03-11 | 东莞市精诚电能设备有限公司 | Relay-controlled high-current load contact protection circuit |
| CN105826063A (en) * | 2016-05-30 | 2016-08-03 | 东北农业大学 | Contactless on-load automatic positive and negative voltage regulating tap switch device for three-phase distribution transformer |
| CN208461795U (en) * | 2017-11-28 | 2019-02-01 | 宁波盈科工业自动化有限公司 | A kind of solid-state relay circuit with short-circuit protection |
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| CN107959488A (en) | 2018-04-24 |
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