Method for monitoring a power output stage
US7161776B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 2004 |
| Grant date | Jan 9, 2007 |
| Priority date | — |
| Expiry date | Jan 3, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0844
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for monitoring a power output stage including at least one half bridge with upper and lower semiconductor switches connected in series, wherein the semiconductor switches are controllable alternately to a switched-on state and a switched-off state by pulse-width modulated pulses, includes measuring a first voltage across the lower semiconductor switch when the upper semiconductor switch is switched on and measuring a second voltage across the lower semiconductor switch when the lower semiconductor switch is switched on, comparing a difference between the operating voltage and the first voltage to a predetermined voltage and comparing the second voltage with the predetermined voltage, which is the maximum permissible voltage across a semiconductor switch when it is switched on, and determining that the power output stage or the output of the at least one half bridge is faulty when at least one of the difference and the second voltage is greater than the predetermined voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.