Load drive circuit using flywheel diode
US6829152B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Dec 6, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D62/112
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A load drive circuit, disposed to drive an inductive load, includes a reflux closed circuit connected to the load. A flywheel diode is placed in the reflux closed circuit. A MOS transistor, disposed to turn on/off current to drive the load, is connected in parallel to the flywheel diode. A capacitor is disposed to connect its both ends to a gate and a drain of the MOS transistor, while a resistor is disposed to connect its both ends to the gate and a source of the MOS transistor. During a recovery operation of the flywheel diode, with the help of the capacitor and resistor, a gate-to-source voltage of the MOS transistor is pulled up to a value over a threshold for a predetermined period of time. Pulling up the gate-to-source voltage results in a softened recovery characteristic of the flywheel diode, suppressing recovery surges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.