Single-chip switching power supply of contactless air conditioner controller

Abstract

The invention discloses a single-chip switching power supply of a contactless 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 MOS1, a diode D1, a resistor R7, a polar capacitor C5, an active band-pass filter circuit, a photoelectric coupling switching circuit, a field effect driving 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; the field effect driving circuit is connected with the photoelectric coupling switching circuit; and the pulse width modulation circuit is connected with an F pin of the control chip U2 and the photoelectric coupling switching circuit. According to the single-chip switching power supply of the contactless 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 single-chip switching power supply of the contactless 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 a non-contact air conditioner controller. 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 the air conditioner, and also seriously a...

AI Technical Summary

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 will cause the relay in the air-conditioning controller to be unstable and affect the This affects the reliability of the air conditioner, and also seriously affects the service life of the air conditioner

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