Operating state circuit for an inverter and method for setting operating states of an inverter
US9154051B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2013 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | Jul 22, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to an operating state circuit for driving an inverter with half-bridges having respective switching devices, which inverter supplies an n-phase supply voltage to an n-phase electrical machine via phase connections associated with the respective half-bridges, where n≧1. The operating state circuit comprises an evaluation device, which is connected to the phase connections of the inverter and to input connections of the inverter and is designed to detect an input voltage of the inverter and phase currents at the phase connections of the inverter, and a drive device which is coupled to the evaluation device and is designed to switch the inverter from a short-circuit state to a freewheeling mode on the basis of the detected input voltage, wherein the evaluation device is designed to generate a freewheeling trigger signal and to output said signal to the drive device if the detected input voltage is lower than an adjustable freewheeling threshold value, and wherein the drive device is designed to change the respective switching devices of the half-bridges to an open state after receiving the freewheeling trigger signal only when the particular phase current detecte…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.