Device and procedure for the detection of a short circuit or overcurrent situation in a power semiconductor switch
US9366717B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2014 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | Dec 25, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2217/0027
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A device for detecting a change in voltage across a switch includes a resistive-capacitive network and a timer circuit. The resistive-capacitive network includes an impedance, a first resistive element, and a first capacitive element to provide a signal representative of a voltage across the switch. The timer circuit generates a detection signal that is representative of the change in the voltage across the switch after switching on of the switch. The timer circuit raises a level of the detection signal if the voltage across the switch does not fall below a predetermined value after switching on of the switch. The resistive-capacitive network is configured such that parasitic capacitances of the device are compensated or over compensated so as to prevent the timer circuit from raising the level of the detection signal if the voltage across the switch does fall below the predetermined value after switching on of the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.