Active overvoltage control for inductive load driving
US4882532A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Oct 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for limiting the transient overvoltage across a power transistor connected in series with an inductive load between a supply rail and a ground rail of the circuit and operated to switch ON-OFF the inductive load utilizes a comparator circuit for switching-ON again the power transistor in order to discharge the energy stored in the load's inductance. The voltage across the power transistor is sensed by a first voltage divider, while a reference voltage is obtained by a second voltage divider connected between the supply and ground. The circuit is practically insensitive to temperature and to variations of the supply voltage and is easily implemented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.