CN201118537Y

CN201118537Y - High-power three-phase solid relay

Info

Publication number: CN201118537Y
Application number: CNU2007201280202U
Authority: CN
Inventors: 殷晨钟
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-03
Filing date: 2007-08-03
Publication date: 2008-09-17
Anticipated expiration: 2017-08-03

Abstract

The utility model relates to a relay, in particular to a big-power three-phase solid-state relay provided with a constant current circuit and with an input end and an output end for insulating protection. The relay is composed of an input circuit, an insulating circuit and an output circuit; wherein the input circuit includes a constant current circuit used for ensuring the current of a control circuit to be controlled within a certain range; the input circuit is connected with the insulating circuit which is used for electric insulating input light and output light; a resistance-capacitance absorber circuit consisting of a RC damping is arranged at the output end of the output circuit and used for prevent superhigh instant current at the output end from damaging the thyristor element in the output circuit. In the utility model, a constant current circuit is arranged in the input circuit to ensure the current of the control circuit to be controlled within a certain range, playing a role of protecting the components; a photoelectric switch is used as the element of the insulating circuit, achieving electric insulating of the input light and the output light and guaranteeing a safer circuit; the resistance-capacitance absorber circuit is arranged at the output end, preventing superhigh instant current at the output end from damaging the thyristor element.

Description

High-power three-phase solid-state relay

Technical field

The utility model relates to a kind of relay, and particularly a kind of constant-current circuit that is provided with, input and output carry out the high-power three-phase solid-state relay of insulation blocking.

Background technology

Solid-state relay is a kind of when input variable reaches certain value, the automatic control device that great-jump-forward changes will take place in output variable, it is a kind of mechanical movement that do not have, the relay that does not contain moving parts, solid-state relay is made up of input circuit, buffer circuit and output circuit three parts, utilize large power triode, power field effect pipe, that the switching characteristic of devices such as individual event controllable silicon and bidirectional triode thyristor reaches is contactless, switch on and off to no-spark controlled circuit.But there is following shortcoming in present solid-state relay: semiconductor device closes to have no progeny still can several microamperes to several milliamperes leakage current, and therefore the electricity that can not realize ideal is isolated; Because tube voltage drop is big, power consumption after the conducting and caloric value are also big, and the volume of high power solid state relay is far longer than the electromagnetic relay with capacity; The temperature characterisitic of electronic devices and components and the antijamming capability of electronic circuit are relatively poor, and the radiation hardness ability is also relatively poor, and as not adopting an effective measure, then functional reliability is low; Solid-state relay is loaded with bigger sensitiveness to crossing, and overload protection measure imperfection causes the damage of electrical appliance easily.

The utility model content

It is good that technical problem to be solved in the utility model provides a kind of electric isolating effect, and antijamming capability is strong, the high-power three-phase solid-state relay of dependable performance.

For solving the problems of the technologies described above, the utility model is realized as follows: high-power three-phase solid-state relay described in the utility model is made up of input circuit, buffer circuit and output circuit; Input circuit comprises a constant-current circuit, and the Current Control that constant-current circuit makes control circuit within the specific limits; Input circuit links to each other with buffer circuit, and buffer circuit is isolated input and output photoelectricity; At the output of output circuit, constitute resistance capaciting absorpting circuit by the RC antihunt circuit, the immediate current that prevents output is excessive and damage thyristor in the output circuit.

Constant-current circuit in the described input circuit comprises two triode Q1 and Q2, the emitter of triode Q1 is electrically connected with the base stage of triode Q2, the collector electrode of triode Q2 is electrically connected with the base stage of triode Q1, input circuit also comprises a light-emitting diode, the anode of light-emitting diode is electrically connected with input anode by resistance R 13, cathodic electricity connects the collector electrode of triode Q1, is used for display working condition.

Described buffer circuit comprises optoelectronic switch U1, U2, U3, U4, U5, U6, optoelectronic switch U1, U3, U5 are electrically connected with input anode by resistance R 10, R11, R12 respectively, and optoelectronic switch U2, U4, U6 connect the next stage output circuit by resistance R 3, R6, R9 respectively.

Described output circuit comprises controllable silicon SCR 1, SCR2, SCR3, SCR4, SCR5, SCR6, the gate pole of controllable silicon SCR 1, SCR3, SCR5 is electrically connected the port 6 of optoelectronic switch U1, U3, U5 respectively, and the gate pole of controllable silicon SCR 2, SCR4, SCR6 is electrically connected the port of optoelectronic switch U2, U4, U6 respectively by resistance R 3, R6, R9.

Good effect of the present utility model is: the utility model is provided with Current Control that constant-current circuit makes control circuit within the specific limits in input circuit, thereby plays the effect of protection components and parts, and circuit working is more stable; Adopt the element of optoelectronic switch as buffer circuit, input and output photoelectricity is isolated, circuit working is safer; Output is provided with resistance capaciting absorpting circuit, prevents the excessive damage thyristor of immediate current of output, and circuit working is more reliable.

Description of drawings

Fig. 1 is the circuit block diagram of the utility model preferred implementation

Fig. 2 is the circuit diagram of preferred implementation shown in Figure 1

Among the figure, 1 input circuit, 2 buffer circuits, 3 output circuits

4 constant-current circuits, 5 resistance capaciting absorpting circuits

Embodiment

As shown in Figure 1 and Figure 2, high-power three-phase solid-state relay described in the utility model is made up of input circuit 1, buffer circuit 2 and output circuit 3; Input circuit 1 comprises a constant-current circuit 4, and constant-current circuit 4 with input current control within the specific limits; Input circuit 1 links to each other with buffer circuit 2, and buffer circuit 2 is isolated input and output photoelectricity; At the output of output circuit 3, constitute resistance capaciting absorpting circuit 5 by the RC antihunt circuit, the immediate current that prevents output is excessive and damage thyristor in the output circuit.

Constant-current circuit 4 in the described input circuit 1 comprises two triode Q1 and Q2, the emitter of triode Q1 is electrically connected with the base stage of triode Q2, the collector electrode of triode Q2 is electrically connected with the base stage of triode Q1, input circuit also comprises a light-emitting diode, the anode of light-emitting diode is electrically connected with input anode by resistance R 13, cathodic electricity connects the collector electrode of triode Q1, is used for display working condition.

Described buffer circuit 2 comprises optoelectronic switch U1, U2, U3, U4, U5, U6, optoelectronic switch U1, U3, U5 are electrically connected with input anode by resistance R 10, R11, R12 respectively, and optoelectronic switch U2, U4, U6 connect next stage output circuit 3 by resistance R 3, R6, R9 respectively.

Described output circuit 3 comprises controllable silicon SCR 1, SCR2, SCR3, SCR4, SCR5, SCR6, the gate pole of controllable silicon SCR 1, SCR3, SCR5 is electrically connected the port 6 of optoelectronic switch U1, U3, U5 respectively, and the gate pole of controllable silicon SCR 2, SCR4, SCR6 is electrically connected the port 4 of optoelectronic switch U2, U4, U6 respectively by resistance R 3, R6, R9.

The course of work of the present utility model is as follows: when the input of control voltage, light-emitting diode is lighted, and optoelectronic switch U1, U2, U3, U4, U5, U6 open, make silicon controlled G1, G2, G3, G4, G5, G6 produce trigger current, thereby make SCR1, SCR2, SCR3, SCR4, SCR5, the SCR6 conducting, promptly R end and U end, S end and V end, T end and W end form path, the output conducting realizes the entire work process of the less big voltage in input voltage control output end.

Claims

1. a high-power three-phase solid-state relay is made up of input circuit (1), buffer circuit (2) and output circuit (3), and it is characterized in that: input circuit (1) comprises a constant-current circuit (4), and constant-current circuit (4) with input current control within the specific limits; Input circuit (1) links to each other with buffer circuit (2), and buffer circuit (2) is isolated input and output photoelectricity; Output in output circuit (3) constitutes resistance capaciting absorpting circuit (5) by the RC antihunt circuit, and the immediate current that prevents output is excessive and damage thyristor in the output circuit.

2. high-power three-phase solid-state relay according to claim 1, it is characterized in that: the constant-current circuit in the described input circuit (4) comprise two triodes (Q1) and (Q2) emitter of triode (Q1) be electrically connected with the base stage of triode (Q2), the collector electrode of triode (Q2) is electrically connected with the base stage of triode (Q1), input circuit also comprises a light-emitting diode, the anode of light-emitting diode is electrically connected with input anode by resistance (R13), cathodic electricity connects the collector electrode of triode (Q1), is used for display working condition.

3. high-power three-phase solid-state relay according to claim 1, it is characterized in that: described buffer circuit (2) comprises optoelectronic switch (U1), (U2), (U3), (U4), (U5), (U6), optoelectronic switch (U1), (U3), (U5) are electrically connected with input anode by resistance (R10), (R11), (R12) respectively, and optoelectronic switch (U2), (U4), (U6) connect next stage output circuit (3) by resistance (R3), (R6), (R9) respectively.

4. high-power three-phase solid-state relay according to claim 1, it is characterized in that: described output circuit (3) comprises controllable silicon (SCR1), (SCR2), (SCR3), (SCR4), (SCR5), (SCR6), the gate pole of controllable silicon (SCR1), (SCR3), (SCR5) is electrically connected the port of optoelectronic switch (U1), (U3), (U5) respectively, and the gate pole of controllable silicon (SCR2), (SCR4), (SCR6) is electrically connected the port of optoelectronic switch (U2), (U4), (U6) respectively by resistance (R3), (R6), (R9).