Adaptive gate charge circuit for power FETs
US5023474A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1989 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Nov 8, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/6877
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive gate charge circuit for switching a power FET on in response to a control signal. The adaptive gate charge circuit includes driving circuitry that responds to assertion of a control signal by providing a charging current from a charge pump reservoir capacitor to the gate of the power FET for an initial time period sufficient to switch the power FET on. After the initial time period, holding circuitry provides holding current from the charge pump to the power FET gate to compensate for charge leakage. Current limiting circuitry connected to the holding circuitry limits current drain from the charge pump after the initial time period to the holding current required to compensate for charge leakage plus a minimum additional current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.