Title:
ELECTRIC CIRCUIT
Document Type and Number:
WIPO Patent Application WO/1997/047071
Kind Code:
A1
Abstract:
A voltage to be rectified from a power supply (15) is applied to the emitter (E) of an NPN transistor (11), and a load (17) is connected to the collector (C). When a voltage at the emitter (E) is higher than that at the collector (C), an operational amplifier (21) applies a voltage of positive polarity to the base, and turns on the NPN transistor (11) in a saturation region. In the saturation region, the voltages at the emitter and collector become substantially equal, and the voltage from the power supply is applied to the load (17) with substantially no loss in the NPN transistor (11). When the voltage at the emitter (E) is lower than that at the collector (C), the operational amplifier (21) applies a voltage of negative polarity to the base to turn off the NPN transistor. Consequently, the power supply voltage is applied between the emitter (E) and collector (C), and the earth voltage to the load (17).
Inventors:
HANEDA MASAJI (JP)
Application Number:
PCT/JP1997/001899
Publication Date:
December 11, 1997
Filing Date:
June 04, 1997
Export Citation:
Assignee:
NTT DATA CORP (JP)
HANEDA MASAJI (JP)
HANEDA MASAJI (JP)
International Classes:
H02M3/335; H02M7/217; H03K17/06; H03K17/30; (IPC1-7): H02M7/21
Foreign References:
| JPH08126317A | 1996-05-17 | |||
| JPH03218264A | 1991-09-25 | |||
| JPH02211062A | 1990-08-22 | |||
| JPH03195360A | 1991-08-26 | |||
| JPS4831302A | 1973-04-24 |
Other References:
See also references of EP 0843404A4
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