SWITCHING POWER SUPPLY DEVICE

PROBLEM TO BE SOLVED: To provide a switching power supply device improved in the reliability and stability of operation by enhancing the accuracy of the detection of overcurrents flowing in switching transistors. SOLUTION: The switching power supply device detects the overcurrent of a PMOS 1 which i...

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Bibliographische Detailangaben
1. Verfasser:	OTAKE NOBUAKI
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 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:	PROBLEM TO BE SOLVED: To provide a switching power supply device improved in the reliability and stability of operation by enhancing the accuracy of the detection of overcurrents flowing in switching transistors. SOLUTION: The switching power supply device detects the overcurrent of a PMOS 1 which is the first conductivity-type switching transistor by using first detections parts 5, 6 and 9, and when the PMOS 1 is in an off-state, and also when second detection parts 11, 12 and 13 detect that the overcurrent flows in an NMOS 2 which is the second conductivity-type switching transistor connected to the PMOS 1 in series thereto even if it reaches its on-duty zone, the switching power supply device suppresses the overcurrent by maintaining the off-state without turing on the PMOS 1. COPYRIGHT: (C)2010,JPO&INPIT