A gas proportional valve pwm driving circuit
A technology of gas proportional valve and driving circuit, which is applied in the direction of valve details, valve devices, engine components, etc., and can solve problems such as complex process, control speed and control accuracy discount
Active Publication Date: 2015-12-23
佛山市赛扬电子科技有限公司
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Problems solved by technology
However, in the constant temperature control algorithm of the system, the correction and adjustment of the PWM signal is often affected by the output of the differential and integral algorithm results from the temperature difference and even the temperature change. Therefore, the PWM modulation control of the proportional valve is not only complicated. , and the control speed and control accuracy are greatly reduced
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Embodiment Construction
[0015] The present invention will be further described below in conjunction with the accompanying drawings.
[0016] Such as figure 1 As shown, a PWM driving circuit for a gas proportional valve mainly includes a PWM signal conversion circuit composed of a first operational amplifier IC circuit U1 and peripheral circuits, and a follower feedback circuit composed of a second operational amplifier IC circuit U2 and peripheral circuits. The second triode Q1, Q2 and the valve drive circuit composed of the peripheral circuit and other three parts.
[0017] Such as figure 1 As shown, the PWM signal conversion circuit is composed of the first operational amplifier IC circuit U1 and its peripheral circuits first resistor R1, second resistor R2, third resistor R3, first capacitor C1, and second capacitor C2. One end of the first resistor R1 is used as the PWM signal input interface, and the other end is connected in parallel with the positive pole of the first capacitor C1 and the se...
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The invention provides a gas proportional valve PWM drive circuit which can be widely used in the fields of gas water heaters, gas-fired hot water boilers and the like. The circuit comprises a PWM signal conversion circuit, a following feedback circuit and a valve drive circuit, wherein the PWM signal conversion circuit is formed by an operational amplifier IC U1 and a peripheral circuit, the following feedback circuit is formed by an operational amplifier IC U2 and a peripheral circuit, and the valve drive circuit is formed by an audion Q1, an audion Q2, a peripheral circuit of the audion Q1 and a peripheral circuit of the audion Q2. When the circuit operates, PWM signals are converted into corresponding analog voltage through the operational amplifier IC U1 and the peripheral circuit to be inputted to the following feedback circuit formed by the operational amplifier IC U2 and the peripheral circuit, the analog voltage is compared with proportional valve feedback sampling voltage in the following feedback circuit, and then appropriate opening voltage is outputted and controls the drive circuit formed by the audion Q1, the audion Q2, the peripheral circuit of the audion Q1 and the peripheral circuit of the audion Q2 to drive a proportional valve. Because the drive circuit is completely controlled by means of hardware, the operating speed is high, control precision is high, the proportional valve is stably controlled, and phenomena of shaking and the like do not happen at all; internal power consumption of the power audion Q2 is extremely low, so the drive circuit is an all-important means for thermostatic control over the gas water heaters and the gas-fired hot water boilers.
Description
technical field [0001] The invention relates to a gas proportional valve PWM drive circuit, in particular to a proportional valve drive circuit applied to gas water heaters, gas hot water boilers and some high-end constant temperature control technology products. Background technique [0002] In the current prior art, it is common to use gas proportional valves in products such as gas water heaters and gas heating boilers, especially in high-end automatic constant temperature control products. This type of product adopts relevant automatic control technology for gas load regulation and constant temperature control of sanitary hot water and heating water, with various control modes, such as PID control, fuzzy control, self-learning control, etc. In this kind of constant temperature control technology, the proportional valve is used as the control link of the actuator, and the drive control of the proportional valve is almost always PWM control mode. Therefore, the driving co...
Claims
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IPC IPC(8): F16K31/02
Inventor 胡志恒刘筱明高中伟
Owner 佛山市赛扬电子科技有限公司