SWITCHING POWER SUPPLY DEVICE

PROBLEM TO BE SOLVED: To provide a switching power supply device capable of preventing the increase of power loss and the breakage of a load even when a power supply voltage of switching control means decreases.SOLUTION: A switching power supply device 1 has: switching means Qthat carries out switch...

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1. Verfasser:	MITSUI TATSUYA
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 capable of preventing the increase of power loss and the breakage of a load even when a power supply voltage of switching control means decreases.SOLUTION: A switching power supply device 1 has: switching means Qthat carries out switching of a primary side DC voltage to generate a switching voltage; switching control means 4 that controls the switching means Q; power supply voltage generation means 5 that rectifies and smooths an induction voltage of a first auxiliary coil Twound so as to have the same polarity as a primary coil T, and generates a power supply voltage to be supplied to the switching control means 4; and stop means 6 that makes the switching control means 4 stop the control to the switching means Qwhen the power supply voltage becomes less than a predetermined threshold voltage.