DC-DC converter
US5502629A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1995 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Mar 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0018
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A DC-DC converter includes first and second MOS transistors which selectively connect a first capacitor to a DC power supply so as to charge the first capacitor, and third and fourth MOS transistors which selectively connect the first capacitor to a second capacitor so as to charge the second capacitor by electric charges stored in the first capacitor. A predetermined output voltage is produced at a lead of the second capacitor serving as an output terminal, based on the charge/discharge operations of the first and second capacitors in response to the switching operations of the four MOS transistors. A variable voltage is applied to a back gate of one MOS transistor selected from the first to fourth MOS transistors. When the selected MOS transistor is on, a first control transistor in the converter forms a connection between a source and a back gate of the selected MOS transistor, to reduce the resistance value of the selected MOS transistor when turned on. When the selected MOS transistor is off, a second control transistor in the converter applies a voltage, selected from the predetermined output voltage and the supply voltages of the first and second DC power supplies, to the ba…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.