Constant current control device, method and system for electromagnetic valve

Abstract

The invention provides a constant current control device, method and system for electromagnetic valve. The device comprises a control chip, a driving module, a current sampling module and a current conversion module, wherein the control chip is an original data processing chip of equipment of a to-be-controlled electromagnetic valve, and the current sampling module and the current conversion module are used for representing a digital current signal of an actual current value passing through the to-be-controlled electromagnetic valve and transmitting the digital current signal to the control chip; the control chip is used for generating a corresponding target PWM control signal according to a preset target current value and the digital current signal, generating a driving signal according to the target PWM control signal and transmitting the driving signal to the driving module; and the driving module is used for transmitting a current with the corresponding output current value to theto-be-controlled electromagnetic valve according to the driving signal from the control chip, wherein a difference value between the output current value and the target current value is within a preset target current error range. According to the scheme, the cost for constant current control of the electromagnetic valve can be lowered.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to a solenoid valve constant current control device, method and system. Background technique [0002] The gas water heater includes a solenoid valve, which is set on the gas pipeline. When water flows out of the water outlet of the gas water heater, the solenoid valve opens to let the gas enter the combustion chamber to burn to heat the water flowing through the gas water heater. When the gas water heater When there is no water flowing out of the water outlet, the solenoid valve is closed to prevent the gas water heater from burning dry. In order for the solenoid valve to operate normally, it is necessary to perform constant current control on the solenoid valve, that is, it is necessary to make the current input to the solenoid valve fluctuate within a constant range. [0003] At present, when performing constant current control on the solenoid valve, a comparator i...

AI Technical Summary

Problems solved by technology

[0004] For the current method of constant current control of the solenoid valve, since the target current and sampling current of the solenoid valve need to be compared through a comparator, a comparator needs to be installed in the power supply circuit of the solenoid valve, and the comparator itself has a certain hardware cost , which in turn results in a higher cost for constant current control of the solenoid valve

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