Pulse width modulator control circuit
US5045800A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1990 |
| Grant date | Sep 3, 1991 |
| Priority date | — |
| Expiry date | Mar 23, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit generates control signals used in pulse width modulation. A square wave signal generator generates a square wave signal based on the value of a sawtooth signal. The sawtooth signal has a maximum voltage level and a minimum voltage level. The voltage level of the sawtooth signal is compared with a first voltage slightly above the minimum voltage level. When voltage of the sawtooth signal is increasing and reaches the first voltage, a rising edge of the square wave is generated. The voltage level of the sawtooth signal is also compared with a second voltage slightly below the maximum voltage level. When voltage of the sawtooth signal is increasing and reaches the second voltage, a falling edge of the square wave signal is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.