DC/DC converter and audio device incorporating the same
US5659241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1995 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Dec 20, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F1/613
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.