Motor driving device for supplying driving current to a three-phase motor through output transistors
US6762576B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jan 27, 2003 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Jan 27, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A driving current flowing through a first output transistor is given to a stator coil of a three-phase motor (first operation), a driving current flowing through the stator coil is output to the ground through a second output transistor (second operation), and no current flows through the stator coil during the off-state of both the first and second output transistors (third operation). Charge remaining in a gate of the first output transistor is rapidly output to the ground through an n-channel transistor for a short time at both the end of the first operation and the start of the second operation. Charge of a high voltage remaining in the stator coil is output to the ground through a voltage clamp circuit as a clamp current during the first and second operations while controlling the clamp current to a low value in a constant current circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.