Power output circuit having a pulse-width modulation mode and a permanently closed mode
US6445168B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1998 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Oct 23, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0045
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power output circuit having a pulse-width modulation generator and an upstream closed-loop control circuit which switches the pulse-width modulation generator and the power output stage to a permanently open mode, a PWM mode having pulse-width-modulated pulses, and a permanently closed mode as a function of a preset external setpoint, an actual value of the power output stage, and a reference voltage derived from the supply voltage. High power loss and high EMC in the full-load threshold region are avoided by prematurely switching from the PWM mode to the permanently closed mode as a function of a preset setpoint and the supply voltage, and returning to the PMW mode with a hysteresis of these values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.