Pulse-width modulated circuit with improved linearity
US5646837A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Dec 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/0828
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse-width modulated (PWM) circuit applies voltage to a load with high fidelity. The circuit includes switches connected in series with inductors, the inductors being magnetically coupled to other inductors connected to the gates of the switches. The arrangement of inductors and the magnetic coupling causes the turn-on of one switch to assist in the turn-off of the other switch. A pair of diodes connected across some of the inductors assures that the magnetically coupled inductors do not assist the switches to turn on. The result is a circuit which effectively eliminates the problem of "shoot through" current, without providing a "dead time" in the switching scheme, and thus without substantial power losses. The circuit can therefore be used in audio amplification, and in other applications requiring high fidelity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.