SWITCHING POWER SUPPLY

PROBLEM TO BE SOLVED: To obtain a switching power supply which outputs negative DC voltage without needing a dedicated negative power supply for driving an operational amplifier constituting a series regulator circuit. SOLUTION: This power supply is provided with: a switching circuit 20 for generati...

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Bibliographische Detailangaben
Hauptverfasser:	AKUSAWA YOSHIYUKI, UEMATSU MASAKI
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 obtain a switching power supply which outputs negative DC voltage without needing a dedicated negative power supply for driving an operational amplifier constituting a series regulator circuit. SOLUTION: This power supply is provided with: a switching circuit 20 for generating a primary AC voltage by making DC voltage from a DC power supply 10 intermittent; a second rectification smoothing circuit 40 which rectifies and smooths a secondary AC voltage induced with the primary AC voltage generated with the switching circuit 20 and outputs DC voltage; and a series regulator circuit 50 which stabilizes the DC voltage output from the second rectification smoothing circuit 40 by controlling impedance of a MOSFET 51 connected with an output terminal of the second rectification smoothing circuit 40 by using an operational amplifier 52 and outputs the DC voltage as negative DC voltage. As a negative power supply of the operational amplifier 52, the negative DC voltage output from the series regulator circuit 50 is used. COPYRIGHT: (C)2004,JPO&NCIPI