Driving circuit of electromagnetic valve

A technology for driving circuits and solenoid valves, applied in engine components, machines/engines, mechanical equipment, etc., can solve problems such as large current fluctuations and inability to meet the requirements of solenoid valve driving current, and achieve stable driving current and meet the driving current. desired effect
CN103291384AActive Publication Date: 2013-09-11HANGZHOU HOLLYSYS AUTOMATION +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU HOLLYSYS AUTOMATION
Publication Date
2013-09-11

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Abstract

The invention discloses a driving circuit which is used for driving an electromagnetic valve in a turbine system. The driving circuit comprises a first differential amplifier, an integrator, a second differential amplifier and a sampling resistor, wherein the input end of the integrator is connected with the output end of the first differential amplifier, the normal phase input end of the second differential amplifier is connected with the output end of the integrator, the sampling resistor is connected between the normal phase input end and the inverted phase input end of the second differential amplifier, the inverted phase input end of the second differential amplifier serves as the current output end of the driving circuit, and the output end of the second differential amplifier is connected with the inverted phase input end of the first differential amplifier. A negative feedback adjusting loop is formed by the sampling resistor and the second differential amplifier. According to the driving circuit, after gains of the second differential amplifier and the resistance valve of the sampling resistor are determined, the output current solely depends on the voltage at the normal phase input end of the first differential amplifier under the effect of a negative feedback circuit, the output driving current is stable, and requirements of the turbine system in a power plant for the driving circuit of the electromagnetic valve can be met.
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Description

technical field

[0001] The present application relates to the technical field of speed control of steam turbines, and more specifically, relates to a solenoid valve driving circuit. Background technique

[0002] In the steam turbine system of a power plant, the speed of the steam turbine is required to be constant, and the speed of the steam turbine depends on the effective value of the current driving the steam regulating valve. Therefore, in order to keep the speed of the steam turbine constant, the solenoid valve controlling the steam flow must have a stable driving current.

[0003] At present, there is a solenoid valve driving circuit, which realizes the current generation through the pulse width adjustment framework feedback system, but the fluctuation of the generated current is relatively large, which is only suitable for the fuel injection system of the internal combustion engine, and cannot meet the requirements of the steam turbine system of the power plant drive...

Claims

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