Power supply control device of magnetic valve flow in anaesthesia machine and method thereof

Abstract

The invention discloses a power supply control device of a magnetic valve flow in an anaesthesia machine. The power supply control device of the magnetic valve flow in the anaesthesia machine comprises a signal generation controller circuit, a power supply chip, a magnetic valve, a constant flow source circuit and a power supply chip input control circuit, wherein the power supply chip input control circuit is used for sending a signal output by the signal generation controller circuit to the power supply chip, and the power supply chip outputs voltage to the magnetic valve. The signal generation controller circuit directly controls a size of constant flow source current through controlling a ratio relationship between a signal and a constant flow source, so that the fact that the constant flow source controls the magnetic valve flow is achieved. The power supply control device reduces the risk of a single fault in the prior art and solves the problems of pipe pressure reducing and heating due to the fact that an MOS pipe is adopted to be served as a control power source switch. The power supply control device is simple in structure, safe by the adoption of opto-isolator protection, high in control accuracy and suitable for fields of industrial control.

Description

technical field [0001] The invention relates to the field of electromagnetic valve flow control in anesthesia machines, in particular to a power supply control device and method for electromagnetic valve flow in anesthesia machines. Background technique [0002] Solenoid valves are usually used in anesthesia machines to precisely control the flow of gases and liquids. The solenoid valve consists of a solenoid coil and a magnetic core, and is a valve body containing one or several holes. When the electromagnetic coil is energized or de-energized, the operation of the magnetic core will cause the fluid to pass through the valve body or be cut off, so as to achieve the purpose of changing the direction of the fluid. In order to ensure the stability of the flow rate of the solenoid valve in the anesthesia machine, it is usually controlled by a constant current source circuit. [0003] The constant current source circuit is also called the current mirror circuit. The essence of ...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects and deficiencies of the prior art, and provide a power supply control device and method for the flow of a solenoid valve in an anesthesia machine. The device controls the working state of the entire circuit by controlling whether the power supply chip outputs a voltage signal to the solenoid valve. , which reduces the risk of a single failure that may exist in the prior art and the problems of tube pressure drop and tube heating that exist when the MOS tube is used as a switch

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