SWITCHING POWER SUPPLY

PROBLEM TO BE SOLVED: To provide a switching power supply which can control power loss to such a small value in the small power consumption condition, where there is no need for improving the power factor. SOLUTION: An output power detecting circuit 22 outputs, when an output power is smaller than t...

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Bibliographische Detailangaben
1. Verfasser:	KITANO SABURO
Format:	Patent
Sprache:	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 CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a switching power supply which can control power loss to such a small value in the small power consumption condition, where there is no need for improving the power factor. SOLUTION: An output power detecting circuit 22 outputs, when an output power is smaller than the threshold, a control signal which does not allow a voltage-boosting chopper circuit 5 to function for improving the power factor and also outputs, when the output power is larger than the threshold, a control signal allowing the voltage-boosting chopper circuit 5 to function to improve the power factor. The voltage-boosting chopper circuit 5 causes the voltage boosting function to stop based on the control signal, when it receives a control signal for not casing the power factor improvement to function from an output power detecting circuit 22. As a result, the output voltage of a bridge rectifier 2 is outputted through slewing to a smoothing capacitor 7.