DC/DC converter and audio device incorporating the same

Details DC/DC converter and audio device incorporating the same DC/DC converter and audio device incorporating the same

1995-12-20

1997-08-19

Berhane, Adolf

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323282, G05F 110, G05F 140

Patent

active

056592418

ABSTRACT:
A DC/DC converter including a MOS transistor which is inserted in parallel with respect to a load and between a power source feeding line connected from a battery to the load and a ground line. the converter also has a first control circuit which generates a power of a boosted voltage via switching of the MOS transistor, receives the power of boosted voltage and controls the boosted voltage so as to be at a predetermined constant value in response to the boosted voltage. A bipolar transistor is inserted in parallel with the MOS transistor. A second control circuit receives power from the battery and causes switching of the bipolar transistor to generate a power of boosted voltage. When the boosted voltage is lower than an operable voltage of the first control circuit, the second control circuit is operated, and when the boosted voltage is equal to or more than the operable voltage, the operation of the second control circuit is stopped.

REFERENCES:
patent: 4644458 (1987-02-01), Harafuji et al.
patent: 4845605 (1989-07-01), Steigerwald
patent: 4903181 (1990-02-01), Seidel
patent: 5440223 (1995-08-01), Hayasaki
patent: 5479088 (1995-12-01), Hayakawa et al.
patent: 5495164 (1996-02-01), Heng
patent: 5565762 (1996-10-01), Ishikawa et al.

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