Motor controller
US7590334B2 · kind B2 · utility
61Cited by
21References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2007 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Dec 1, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one aspect, a control circuit to control a speed of a motor includes a PWM oscillator configured to generate a PWM output signal having a duty cycle. The speed of the motor is controlled by the PWM output signal to be proportional to the duty cycle. The control circuit also includes a duty cycle control circuit responsive to a duty cycle selection signal and coupled to the PWM oscillator. The duty cycle control circuit is configured to compare a voltage reference and a supply voltage. The duty cycle control circuit controls the duty cycle of the PWM output signal to be inversely proportional to the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.