Switching bipolar driver circuit for inductive load
US5075568A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1991 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Jan 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/04126
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A bipolar chopping driver circuit has a pair of NPN totem-pole connected driver transistors with a fly-back diode connected across the NPN source transistor and a biasing resistor connected between base and emitter of the source transistor. A fullwave bridge driver may be comprised of two such totem pole circuits with the inductive load connected between them at the junctions between NPN source and sink transistors. A clamp circuit is provided in both cases, for preventing the voltage swings at the bases of the source transistors from exceeding the DC supply voltage that is connected to the collectors of the source transistors, thereby permitting operation at high chopping frequencies without excessive delay in switching load current and excessive power losses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.