Bidirectional TVS based accelerating release circuit and method

Abstract

The invention discloses a bidirectional TVS based accelerating release circuit which comprises resistors R1, R2, a field-effect tube Q1, a bidirectional TVS tube D1 and an electromagnetic valve L; oneend of the resistor R1 is connected with a control input signal; the other end of the resistor R1 is connected with a G end of the field-effect tube and the resistor R2; a D end of the field-effect tube and the other end of the resistor R2 are connected with the ground; one end of the bidirectional TVS tube D1 is connected with a positive terminal of a power supply; the other end of the bidirectional TVS tube D1 is connected with an S end of the field-effect tube; and the electromagnetic valve is connected in parallel with the bidirectional TVS tube D1. For the bidirectional TVS based accelerating release circuit provided by the invention, by adding the accelerating release circuit in an electromagnetic valve drive loop, the closing response speed of the electromagnetic valve is increased, the closing response time of the electromagnetic valve is reduced, and the design difficulty of the electromagnetic valve is lowered; by using only one bidirectional TVS tube, one field-effect tubeand some resistors, the bidirectional TVS based accelerating release circuit has the advantages of space conservation, low cost and the like; and by taking the bidirectional TVS tube as an accelerating release component, the bidirectional TVS based accelerating release circuit has the characteristics of bidirectional overvoltage protection, strong instantaneous overload ability, extremely rapid response speed, large absorption power consumption, small current leakage, stable clamp voltage and the like.

Description

technical field [0001] The invention relates to the technical field of solenoid valve drive, in particular to a quick release circuit for a solenoid valve. Background technique [0002] With the development of solenoid valve driving technology, the requirements for the quick response of the solenoid valve are getting higher and higher, especially the requirements for the closing time response of the solenoid valve are getting higher and higher. One method is to adopt a special structure in the design of the solenoid valve coil to accelerate the closing of the solenoid valve. This method is complex in process, difficult in development and high in cost. Another method uses a special-function acceleration circuit to quickly release the residual energy in the inductive load of the solenoid valve coil, and at the same time suppress the reverse electromotive force of the coil to quickly close the solenoid valve. This method is simple, reliable, and low in cost. Contents of the i...

AI Technical Summary

Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide an accelerated release circuit based on bidirectional TVS, to solve the problems of complex process, difficult research and development, and high cost of the prior art, and to improve the closing response of the solenoid valve Speed, reducing the closing response time of the solenoid valve, has a simple structure, strong versatility, cost saving, can effectively suppress the reverse electromotive force generated when the solenoid valve is turned off, and has a good protective effect on the drive circuit

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