Soft start circuit based on frequency turn-back

The invention relates to the field of switching power supplies, and discloses a soft start circuit based on frequency turn-back, and the soft start circuit comprises a soft start unit which is used for generating a first switching control signal through a soft start switching power supply; the frequ...

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Bibliographische Detailangaben
Hauptverfasser:	FENG HANXUE, LI DONGCHAO
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 relates to the field of switching power supplies, and discloses a soft start circuit based on frequency turn-back, and the soft start circuit comprises a soft start unit which is used for generating a first switching control signal through a soft start switching power supply; the frequency division unit is used for performing frequency division on the first switch control signal when frequency turn-back occurs to obtain a frequency division signal; and the logic unit is used for receiving turn-back signals of different frequency turn-back stages generated when frequency turn-back occurs, performing logical operation on the first switch control signal, the frequency division signal and the turn-back signals, outputting a second switch control signal with constant frequency, taking the second switch control signal as a soft start control signal, and outputting the soft start control signal. And further controlling the output waveform of the soft-start switching power supply to be kept unchanged. A