Switch current sensing with snubber current suppression in a push-pull converter
US4542440A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1983 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Nov 2, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/3378
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A push-pull converter has transistor power switches which conduct alternately to connect a DC source with the primary windings of an output transformer. A turn-off snubber circuit is connected with each power switch. When a power switch is turned on, snubber current pulses flow in the circuits connected with both switches. A switch current sensor circuit has a current transformer with an output winding inductively coupled with each of the conductors connected between the power switches and the primary windings of the output transformer. The snubber current pulses through the conductors are 180.degree. out of phase and are suppressed in the current transformer output. The switch current signal from the secondary of the current transformer is free of snubber current pulses and is used in a flux balance circuit and in a pulse-by-pulse current limiter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.