Wide voltage power supply circuit applied to fan or thermantidote

Abstract

The invention discloses a wide voltage power supply circuit applied to a fan or a thermantidote. The circuit comprises an insurance line, an EMC circuit, a rectification filter circuit, a PWM switch control transduction circuit and an energy storage voltage stabilizing circuit which are successively connected. The PWM switch control transduction circuit comprises 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 energy storage voltage stabilizing circuit comprises an inductor L2, a diode D4, a capacitor EC4 and a resistor R7. The capacitor C2 and the capacitor C3 are grounded through the reversely-arranged diode D4 respectively. An anode of the diode D4 is connected to a switch pulse output terminal of a direct current 5V through the capacitor EC4 and a cathode is connected to the switch pulse output terminal of the direct current 5V through the inductor L2. The switch pulse output terminal of the direct current 5V is grounded through the resistor R7. The circuit possesses advantages that a DC85-275V input voltage is universal; an output voltage is stable and smooth; energy consumption is low and the circuit accords with a national performance standard.

Description

technical field [0001] The invention relates to a fan and a cooling fan, in particular to a wide-voltage power supply circuit for the fan or the cooling fan. Background technique [0002] The current wide-voltage power supply circuits for fans or cooling fans mostly use power frequency transformers, and 110V and 220V cannot be used universally. When using 220V as the standard voltage, it cannot be used below 180V; when using 110V as the standard voltage, low It cannot be used at 90V, and the energy consumption is greater than the international standard of 0.5 watts, which does not meet the energy efficiency standard. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a DC85-275V universal input voltage, stable and smooth output voltage, low energy consumption, and a wide-voltage power supply circuit for fans or cooling fans that meets national efficiency standards. [0004] In order to solve the problems of the tec...

AI Technical Summary

Problems solved by technology

[0002] The current wide-voltage power supply circuits for fans or cooling fans mostly use power frequency transformers, and 110V and 220V cannot be used universally. When using 220V as the standard voltage, it cannot be used below 180V; when using 110V as the standard voltage, low It cannot be used at 90V, and the energy consumption is greater than the international standard of 0.5 watts, which does not meet the energy efficiency standard

Images