Soft start control circuit, control method thereof and power supply circuit

The invention provides a soft start control circuit, a control method thereof and a power supply circuit. The soft start control circuit is used for controlling the main switch tube and comprises a sampling circuit, a comparison circuit and a driving circuit. The sampling circuit is used for obtaini...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TAN RUNQIN, CHEN BIAO, CHEN NINGKAI, RUAN JIANCONG
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	The invention provides a soft start control circuit, a control method thereof and a power supply circuit. The soft start control circuit is used for controlling the main switch tube and comprises a sampling circuit, a comparison circuit and a driving circuit. The sampling circuit is used for obtaining a sampling signal representing the output voltage. The comparison circuit is used for generating a comparison result signal according to the soft start reference voltage and the sampling signal. The driving circuit comprises a tenth switch tube and a current mirror circuit, the control end of the tenth switch tube is coupled with the comparison circuit, the first end of the current mirror circuit is coupled with the tenth switch tube, and the second end of the current mirror circuit is used for being coupled with the main switch tube. The driving circuit controls the tenth switch tube according to the comparison result signal so as to control the first current flowing through the tenth switch tube, and controls