Upper alternating current draught fan speed regulating system of gas water heater
A technology for speed regulation of gas water heaters and fans, applied in AC motor control, control systems, electrical components, etc., can solve problems such as flameout and unstable combustion of water heaters, achieve easy control, solve unstable combustion and flameout, and achieve simple Effect
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[0020] A further detailed description will be made below in conjunction with the accompanying drawings and embodiments of the present invention:
[0021] Such as figure 1 As shown, a speed control system for an AC fan on a gas water heater includes a single-phase AC PG motor 1 connected to an AC circuit and a thyristor switch circuit 2 for controlling its input voltage waveform, that is, an effective voltage value. The PG motor 1 is also connected with a motor speed feedback circuit 3, and the AC circuit is also connected with a zero-crossing detection circuit 4 for detecting the zero-crossing moment of the AC voltage to provide a reference point for calculating the turn-on moment of the thyristor switch circuit 2, so The speed regulating system also includes a controller 5 for calculating and controlling the turn-on time of the thyristor switch circuit 2 to realize the speed regulation of the single-phase AC PG motor 1, the motor speed feedback circuit 3, the zero-crossing de...
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