Current mirror circuit used in a coil driver circuit of a brushless DC motor
US5610486A · kind A · utility
14Cited by
18References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1995 |
| Grant date | Mar 11, 1997 |
| Priority date | — |
| Expiry date | Feb 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/15
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A stator coil driver circuit for a brushless DC motor, with an improved current mirror, is disclosed. The improved current mirror has a first transistor which conducts current and a second transistor configured to mirror the current of the first transistor. Additionally, the improved mirror circuit includes a unity gain amplifier connected in between the gates of the first and second transistor. The effect of the unity gain transistor is to provide for a faster turn-off of the second transistor and reduce oscillation of the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.