Flyback switching power supply starting device

The invention belongs to the technical field of switching power supply low-power-consumption starting circuits, and particularly relates to a flyback switching power supply starting device which comprises a switch box body and further comprises a lower circuit board fixedly installed in the switch b...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WANG AI, XUE XIONG, LIU GUANGPING, WU JINYA
Format: Patent
Sprache:chi ; eng
Schlagworte:
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Beschreibung
Zusammenfassung:The invention belongs to the technical field of switching power supply low-power-consumption starting circuits, and particularly relates to a flyback switching power supply starting device which comprises a switch box body and further comprises a lower circuit board fixedly installed in the switch box body, and a converter fixedly installed at the top of the lower circuit board. One side of the converter is fixedly provided with an R4 flowing through a capacitor C2, when VIN + passing through the converter has input voltage, input power flows through the capacitor C2 through the R4 to be rapidly charged, when the voltage of the capacitor reaches the voltage stabilizing value of a Z1 voltage stabilizing diode, a Q2 switching tube is switched on, the input voltage supplies power to a chip through an R5 module, a Q2 module and a D1 module, and when the power supply voltage of a U1 control chip meets the use requirement, the chip is switched on through a triode Q1. Through the emitted PWM pulse waveform, the Q3 c