Driver for voltage driven type switching element
US7514967B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2006 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Jul 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/166
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A driver apparatus and method for driving a voltage driven type switching element that discharge an electrical charge stored at the gate terminal of the voltage driven type switching element at a discharge rate. The discharge rate is controlled so that the change rate over time of the voltage between the collector and emitter terminals of the voltage driven type switching element is limited to a second change rate during the turn-off operation. The starting time of the control of the change rate over time to attain the second change rate is delayed for a predetermined delay time after start of the turn-off operation and before a time when the voltage between the collector and emitter terminals first reaches the power source voltage level. During the delay time, the discharge rate is initially at a first change rate higher than the second change rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.