JPH05344711

JPH05344711

PURPOSE:To miniaturize a system by connecting a bootstrap capacitor between the collector of an NPN transistor and the cathode of a diode with anode connected with a powder supply. CONSTITUTION:In a drive circuit 2, a transistor Tr12 is turned on and Tr14, Tr15 and Tr17 are turned off when an input...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SHIMIZU KATSUYA, SAKABE MASANORI, MATSUYAMA TOSHIYUKI
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
BASIC ELECTRONIC CIRCUITRY
CONTROL OR REGULATION THEREOF
CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:PURPOSE:To miniaturize a system by connecting a bootstrap capacitor between the collector of an NPN transistor and the cathode of a diode with anode connected with a powder supply. CONSTITUTION:In a drive circuit 2, a transistor Tr12 is turned on and Tr14, Tr15 and Tr17 are turned off when an input signal Vin reaches an H level. Then, a base current is supplied from a power supply Vcc so that a transistor Tr16 is turned on and a transistor Tr18 is simultaneously turned on while a transistor Tr8 is turned off. However, a sufficient base current is supplied by a bootstrap capacitor CBS so that the transistor Tr18 is quickly turned on. On the other hand, when the input signal is at an L level, the transistor Tr12 is turned off, the Tr14, Tr15 and Tr17 are turned on and the Tr16 and Tr18 are simultaneously turned off. As a result, the transistor Tr8 is turned on and driven on the basis of a constant current. Therefore, the power supply Vcc can be made into a low-voltage one and a system can be miniaturized.