A control method of dynamic characteristics of on-off valve based on compound pwm

Abstract

The invention discloses a method for controlling the dynamic characteristics of an on-off valve based on compound PWM, which belongs to the field of on-off valve control. The control method of the present invention is divided into several stages, and the high-frequency square wave signals of different duty ratios are output by the controller to control the duty ratio controller to the voltage source, and the voltage source outputs voltage square waves of different duty ratios at different stages, so that The opening and closing dynamic characteristics of the high frequency switching valve can be adjusted. The invention further discloses a scheme for adjusting the opening and closing characteristics of the opening and closing valve under the condition that the single cycle duration of the opening and closing valve is short, and provides the slowest opening and closing characteristic control method and the fastest opening and closing characteristic control method of the opening and closing valve. By adjusting the duty cycle of each stage, the invention enables the high-frequency on-off valve to meet the different demands of users on the dynamic characteristics of opening and closing of the high-frequency on-off valve, thereby greatly expanding the working range of the high-frequency on-off valve.

Description

technical field [0001] The invention belongs to the field of on-off valve control, and in particular relates to a method for regulating and controlling the dynamic characteristics of an on-off valve based on compound PWM. Background technique [0002] In switching valves, the number of ampere turns and the working air gap have the greatest influence on the electromagnetic force of the electromagnet. Ampere-turns is the product of the number of turns of the coil and the current in the single-turn coil. When the magnetic flux is not saturated, the greater the current, the greater the electromagnetic force; the smaller the working air gap, the greater the electromagnetic force. Since the on-off valve is often when the working air gap in the electromagnet is the largest when it is opened, and when it is closed is often the time when the working air gap in the electromagnet is the smallest, so the opening current is larger than the closing current. [0003] In the existing fiel...

AI Technical Summary

Problems solved by technology

Due to the obvious inductance effect of the switch valve coil in the high frequency state, there will be a movement hysteresis phenomenon in the opening and closing stages of the switch valve in the prior art, that is, under the action of voltage, the current will lag due to the inductance effect, and it will take a period of time. time to rise to the desired current value

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