Low radiated emission motor speed control with PWM regulator
US5742142A · kind A · utility
17Cited by
13References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 9, 1996 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Aug 9, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An FET switch and an inductor in series with a DC motor supply voltage pulses at a high frequency, a power diode permits current recirculation, and a capacitor connected to the motor maintains a mean DC voltage level on the motor which is proportional to the switching duty cycle. The motor speed is proportional to the mean voltage. Smoothing due to the capacitor and the inductor converts the voltage pulses due to switching to a small sinusoidal ripple to attain low radiated emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.