Solid-state relay

Abstract

The invention relates to a solid-state relay comprising a control signal processing circuit, a state latch circuit, a protection circuit, a logic operational circuit, a drive circuit and a control switch, wherein the state latch circuit is separately connected with the control signal processing circuit, the protection circuit, the logic operational circuit and the drive circuit; the control signalprocessing circuit is also connected with the logic operational circuit; the logic operational circuit is also connected with the drive circuit; and the drive circuit is also connected with the control switch. According to the solid-state relay provided by the invention, a previous connection or disconnection state of the control switch can also be kept even an external control power input is cutoff; the solid-state relay has a state keeping function, and needs extremely low energy when the state is kept, so as to be beneficial to prolonging the service life of the solid-state relay having the state keeping function.

Description

technical field [0001] The invention relates to the field of relays, in particular to a solid-state relay with a state holding function. Background technique [0002] At present, solid-state relays can be divided into semi-controlled solid-state relays and full-control solid-state relays according to the controllability of semiconductor devices. Take the fully controlled solid state relay as an example, such as image 3 As shown, the switching devices are mainly MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor Field-Effect Transistor) and IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), which are composed of two common sources MOSFETs and IGBTs with two poles form a bidirectional controllable switch 37. During normal operation, control power is provided to the interface circuit 31, and the interface circuit 31 isolates the power and sends it to the controller 32 and other internal detection circuits, including ...

AI Technical Summary

Problems solved by technology

[0003] It can be seen that the existing solid-state relays can only rely on the externally provided control power to maintain the on-off state, and the control power must always exist, which reduces the reliability of the system, and both the voltage detection circuit and the freewheeling diode require a power ground, which increases the The complexity of the system, and the power supply end and the load end cannot be interchanged, there are potential risks in use

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