Switching signal modulation circuit
US7208926B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 17, 2004 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Oct 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/44
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching signal modulation circuit includes a switching control circuit having an ON time control terminal and an OFF time control terminal, the switching control circuit capable of adjusting respectively separately ON time and OFF time of a switching signal using values of resistors externally attached respectively to the ON time control terminal and the OFF time control terminal; a spread signal generating circuit operable to output a spread signal; an ON time setting resistor connected between the ground and the ON time control terminal of the switching control circuit; an OFF time setting resistor connected between the ground and the OFF time control terminal of the switching control circuit; a first weight resistor operable to vary the frequency and the duty of the switching signal, the first weight resistor connected between an output of the spread signal generating circuit and the ON time control terminal of the switching control circuit; and a second weight resistor operable to vary the frequency and the duty of the switching signal, the second weight resistor connected between the output of the spread signal generating circuit and the OFF time control terminal of the sw…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.