Protective circuit for a series connection of a power semi-conductor end stage and an inductive consumer
US6577482B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Jul 31, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A protective circuit for a series circuit of a power semiconductor and an inductive load, to which a freewheeling circuit of a freewheeling diode and a reverse polarity protection semiconductor switch connected in series is connected in parallel. The power semiconductor output stage may be switched on and off depending on a predetermined setpoint value with a pulse-width modulated control signal and the reverse polarity protection semiconductor switch may be made non-conducting via a charging pump when the polarity of the supply voltage is reversed. The destruction of components in the case of non-functioning of the freewheeling circuit may be avoided by monitoring a point in the freewheeling circuit of a freewheeling diode and a reverse polarity protection semiconductor switch or in the series circuit of load and power semiconductor output stage for a voltage or a current which appears if the freewheeling circuit is non-functioning, and by initiating the shut-off of the control of the power semiconductor output stage with this fault indicating voltage or current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.