Photoelectric coupling switching circuit-based single-chip switching power supply of air conditioner controller

Abstract

The invention discloses a photoelectric coupling switching circuit-based single-chip switching power supply of an air conditioner controller. The single-chip switching power supply is characterized by mainly comprising a control chip U2, a diode rectifier U1, a transformer T, a field effect tube MOS, a diode D1, a resistor R7, a polar capacitor C5, a voltage buffer circuit, an active band-pass filter circuit, a photoelectric coupling switching circuit and a pulse width modulation circuit, wherein the photoelectric coupling switching circuit is connected between the control chip U2 and a secondary induction coil of the transformer T in series; and the pulse width modulation circuit is connected with an F pin of the control chip U2 and the photoelectric coupling switching circuit separately. According to the photoelectric coupling switching circuit-based single-chip switching power supply of the air conditioner controller, input voltage fluctuation can be effectively adjusted; voltage can be kept stable; band-pass voltage can be adjusted; and output voltage is consistent with reference voltage, so that the condition that the photoelectric coupling switching circuit-based single-chip switching power supply of the air conditioner controller can output stable voltage is ensured; and the attracting stability of a relay is effectively ensured.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a single-chip switching power supply for an air conditioner controller based on a photoelectric coupling switching circuit. Background technique [0002] At present, most of the power supplies of household air conditioner controllers still use low-frequency iron-core transformers to rectify through diodes, and directly output low-frequency linear power supplies with a voltage of 12 volts after being filtered by capacitors. The 12-volt voltage output by the low-frequency linear power supply supplies power to the wire pack of the relay in the air-conditioning controller. However, the output voltage of this low-frequency linear power supply has not been stabilized, so the output voltage and current will be unstable due to the fluctuation of the input mains voltage, which will cause the relay in the air-conditioning controller to be unstable and affect the This affects the reliability of ...

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Problems solved by technology

However, the output voltage of this low-frequency linear power supply has not been stabilized, so the output voltage and current will be unstable due to the fluctuation of the input mains voltage, which w

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