Inductance and capacitance charge pump circuit for driving power MOS transistor bridges
US4980576A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1989 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Jun 12, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/063
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The circuit comprises a tank capacitance and a charge circuit supplied with the same voltage as the bridge and comprising an inductance and a control transistor. There is also provided a control circuit, which comprises an oscillator controlling the periodic switching of control transistor and a comparator which controls the momentary clamping of control transistor in the condition wherein the charge circuit is interrupted when the difference between the voltage across capacitance and the power supply voltage exceeds a preset maximum value and the unclamping of the same transistor when such difference falls below a preset minimum value. A further comparator similarly clamps control transistor if there is an excess current in the transistor itself.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.