Wide voltage power supply circuit applied to fan or thermantidote
A power supply circuit and wide voltage technology, applied in the direction of conversion equipment without intermediate conversion to AC, irreversible AC power input conversion to DC power output, non-variable pumps, etc., can solve the problems that do not meet energy efficiency standards, cannot be used universally, Problems such as large energy consumption, to achieve the effect of stable and smooth output voltage, universal input voltage, and low energy consumption
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[0012] Such as figure 1 As shown, the wide-voltage power supply circuit for a fan or a cold fan in this embodiment includes a fuse circuit, an EMC circuit, a rectification filter circuit, a PWM switch control conversion circuit, and an energy storage voltage stabilization circuit that are sequentially connected.
[0013] Such as figure 2 As shown, the PWM switching control conversion circuit includes a PWM control chip U1, a capacitor EC3, a resistor R5, a resistor R6, a capacitor C2, a capacitor C3, and a diode D3. The SW end of the PWM control chip U1 is connected to the output end of the rectifier filter circuit. The VDD end of the control chip U1 is connected in series with the resistor R5 and the diode D3 arranged in the opposite direction as the DC 5V switching pulse output terminal, and the DC 5V switching pulse output terminal is connected to the neutral line N of the AC power bus, and one end of the resistor R5 Ground through the capacitor C2, the other end through the ...
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