Flyback switching power supply circuit

一种反激开关电源电路

Abstract

The utility model relates to a flyback switching power supply circuit, which comprises a rectifying and filtering circuit, a flyback switching circuit, an output filtering circuit, a feedback sampling circuit, a power supply circuit, a driving circuit, an input voltage power-down detection and X capacitor detection and discharging circuit, and a control circuit. The control circuit comprises a control chip, a first resistor, an over-temperature protection circuit and a second resistor, wherein the control chip comprises a driving pin, an output feedback pin, a system protection pin, a power supply input pin, a current sampling pin, a high-voltage starting pin and a chip ground pin; the system protection pin is connected with the flyback switching circuit through the first resistor, and is connected to the ground through the over-temperature protection circuit; the current sampling pin is connected with an ungrounded end of a sampling resistor at a primary side of a transformer in the flyback switching circuit through the second resistor; and the high-voltage starting pin is connected with the input voltage power-down detection and X capacitor detection and discharging circuit.
本实用新型涉及一种反激开关电源电路,包括:整流滤波电路、反激开关电路、输出滤波电路、反馈采样电路、供电电路、驱动电路、输入电压掉电侦测和X电容检测及放电电路、以及控制电路,所述控制电路包含控制芯片、第一电阻、过温保护电路、以及第二电阻,所述控制芯片包括:驱动脚;输出反馈脚;系统保护脚,所述系统保护脚经由所述第一电阻与所述反激开关电路连接,并经由过温保护电路连接到地;供电输入脚;电流采样脚,所述电流采样脚经由所述第二电阻与所述反激开关电路的变压器原边侧的采样电阻的未接地的一端连接;高压启动脚,所述高压启动脚与所述输入电压掉电侦测和X电容检测及放电电路连接;以及芯片地脚。

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Cited By (3)

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    CN-104734518-AJune 24, 2015中国石油集团渤海钻探工程有限公司Switching power supply circuit for intelligent drilling tool
    CN-105680678-AJune 15, 2016合肥惠科金扬科技有限公司Discharge circuit and AC power supply device
    CN-106686831-AMay 17, 2017上海晶丰明源半导体股份有限公司输出开路保护电路、可控硅调光led驱动系统及方法