Reduced RFI power pulse modulator
US6014049A · kind A · utility
3Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1995 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Apr 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/163
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A modulator has an FET output driver for applying repetitive pulses to an inductive load. A predriver comprises a resistor and capacitor in parallel across the FET source and gate for shaping the control voltage. A constant current source, turned on and off by an input signal, couples the shaping circuit to ground. The resistor and capacitor values determine the rate of control voltage change which is the same for turn-on and turn-off, to control the driver current slew rate for minimizing RFI emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.