Serial IGBT voltage equalization method and system based on auxiliary voltage source
US11705899B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2019 |
| Grant date | Jul 18, 2023 |
| Priority date | — |
| Expiry date | Jun 13, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K2017/226
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A serial IGBT voltage equalization method and system based on an auxiliary voltage source is disclosed. The method includes the following steps. (1) Detect a port dynamic voltage of each serial IGBT. (2) Perform dynamic overvoltage diagnosis respectively on the port dynamic voltage of each IGBT. (3) Supply emergency high level signal to the gate of the IGBT when there is dynamic overvoltage. (4) Stop supplying emergency high level signal to the gate of the IGBT, supply a constant voltage at the gate of the IGBT through the auxiliary voltage source. The invention provides a constant voltage through the auxiliary voltage source, prolongs the off time of the faulty IGBT, and turns off other IGBTs simultaneously, thereby achieving the purpose of serial IGBT voltage equalization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.