Direct current power supply with a transistor chopper
US4034281A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1975 |
| Grant date | Jul 5, 1977 |
| Priority date | — |
| Expiry date | Mar 17, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1563
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A source of direct current has its opposite polarity terminals connected to an electrical load via a transistor functioning as a chopper. A reactor is provided which comprises a primary winding also connected between the DC source and the load, a secondary winding adapted to apply a biasing voltage across the base and emitter of the transistor, and a tertiary winding constituting a part of the energy release circuit through which the energy stored in the reactor during each conducting period of the transistor is released. A base control circuit in the form of, for instance, a voltage regulating diode is connected to the base of the transistor. The transistor performs the desired "chopping" or current interrupting function to permit the delivery of substantially constant DC power from the DC source to the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.