Direct-current solid electronic switch

Abstract

The invention relates to a direct-current solid switch, which realizes high speed switch property and higher performance to price ratio on the basis of a P-channel insulated gate field effect pipe, a gate drive circuit, a gate circuit, an input protection circuit and an electrical coupling unit. The P-channel insulated gate field effect pipe is used as a switch control component to input control signals which are non-isolated or isolated switching value signals; the non-isolated or isolated switching value signals respectively enter the gate circuit to be judged in the quality and reshaped through the input protection circuit and the electrical coupling unit; generated switching value control signals are transformed through the gate drive circuit; gate control signals controlling the P-channel insulated gate field effect pipe to communicate are obtained, thus the direct-current solid switch with high switching-on and off speed and high reliability is obtained. The invention has the advantages of simple hardware circuits, high reliability, high-speed switching-on and off property, high current control capability, higher performance to price ratio and is widely used in the field of network, communication, IT household electrical appliances, industrial automation and the like.

Description

technical field [0001] The invention belongs to the technical field of industrial automation control, and in particular relates to a solid direct current electronic switch, which is mainly used in the field of industrial control to control the on-off of direct current circuits. Background technique [0002] In the industrial control system, it is often necessary to control the on-off of the circuit, which is generally realized by the on-off control of the relay through the I / O switch. At present, the commonly used relays in the domestic industrial control field include mechanical and solid-state electronic relays. Due to their different working principles, they also bring different restrictions to their applications. The main problems are: [0003] (1) The main problem with the use of mechanical relays is that their switching frequency is low, and the TTL level cannot directly control its on-off, requiring an additional drive circuit; in addition, the use of mechanical relay...

AI Technical Summary

Problems solved by technology

[0003] (1) The main problem with the use of mechanical relays is that their switching frequency is low, and the TTL level cannot directly control its on-off, requiring an additional drive circuit; in addition, the use of mechanical relays will also bring noise and EMI radiation problems

[0004] (2) The use of solid-state electronic relays has a high switching frequency, but the high-current on-off control capability is limited, and the realization of electronic switches with electrical isolation functions is more complicated, the price is high, and the anti-interference ability is poor

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