Solid state relay circuit with short circuit protection

Abstract

The invention discloses the technical field of a solid state relay circuit and specifically discloses a solid state relay circuit with short circuit protection. The solid state relay circuit comprisesan input circuit, a control circuit, a zero crossing circuit, an output circuit, an absorption circuit, a short circuit protection circuit and a sampling circuit. According to the solid state relay circuit, the short circuit protection circuit and the sampling circuit are increased; a tri-electrode AC switch Q3 in the short circuit protection circuit is rapid in powercut response and is characterized by microsecond level switch-on or switch-off, so components in the circuit and the load on the circuit can be protected, and the loss is avoided; the solid state relay circuit is characterized byrapid powercut speed; the output circuit comprises a tri-electrode AC switch TR1, so when short circuit or damage occurs in the load of a solid state relay, the tri-electrode AC switch TR1 in the output circuit is timely switched off, and the service life is prolonged and the cost is reduced.

Description

technical field [0001] The invention discloses the technical field of solid-state relay circuits, and more specifically discloses a solid-state relay circuit with short-circuit protection. Background technique [0002] The traditional solid-state relays used in the market do not have short-circuit protection function. When the external load has a problem and the current is too large, the solid-state relay is often damaged. The general method is to connect a circuit breaker in series on the line as a line protector. But each line is connected with a circuit breaker in series, which not only costs money and space, but also because the circuit breaker is a purely mechanical structure with a relatively slow response speed, so it does not play a very big role, so the circuit breaker is often disconnected from the circuit. After that, the solid state relay has also been permanently damaged and cannot be used again. Contents of the invention [0003] In view of this, the object ...

AI Technical Summary

Problems solved by technology

[0002] The traditional solid-state relays used in the market do not have short-circuit protection function. When the external load has a problem and the current is too large, the solid-state relay is often damaged. The general method is to connect a circuit breaker in series on the line as a line protector. But each line is connected with a circuit breaker in series, which not only costs money and space, but also because the circuit breaker is a purely mechanical structure with a relatively slow response speed, so it does not play a very big role, so the circuit breaker is often disconnected from the circuit. After that, the solid state relay has also been permanently damaged and cannot be used again

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