Inverter with proportional base drive controlled by a current transformer
US4970635A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1988 |
| Grant date | Nov 13, 1990 |
| Priority date | — |
| Expiry date | Nov 14, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/666
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An inverter in accordance with the present invention includes a plurality of bipolar transistors (102) with each bipolar transistor having a freewheeling diode (108) poled in parallel with outputs of the bipolar transistor, a current transformer (112) in a positive feedback circuit (110) associated with each bipolar transistor causing a positive feedback to be applied from an output of the inverter to a base of each bipolar transistor to provide a base drive proportional to current flowing in a load coupled to the bipolar transistors, a rectifier (120), disposed in each of the positive feedback circuits for permitting current to flow to the base of the bipolar transistor when the bipolar transistor is conductive and blocking flow of current from the base to the emitter when the bipolar transistor is not forward biased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.