Intermediate circuit capacitor short-circuit monitoring
US7084638B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2003 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Jul 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The electronic monitoring circuit for monitoring one of a group of series-connected capacitor units in an intermediate circuit in order to detect short-circuiting of one of the capacitor units includes a device for deriving a reference voltage (14) from an intermediate-circuit voltage (L(+), L(−)) applied across the series-connected capacitor units (1, 2), a device for generating a control signal consisting of a voltage difference between the reference voltage (14) and a junction voltage at a junction (13) between two capacitor unit (1, 2) and a device for generating an error signal when said voltage difference falls below or exceeds an activation threshold voltage thus indicating that one of the capacitor units (1,2) has been short-circuited. The activation threshold voltage corresponds to a breakdown voltage of a zener diode provided in the monitoring circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.