Method and device for supressing common-mode voltage of inverter alternating current cable relative to ground
US9912146B1 · kind B1 · utility
Inventors
Key dates
| Filing date | May 30, 2017 |
| Grant date | Mar 6, 2018 |
| Priority date | — |
| Expiry date | May 30, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/123
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and a device for suppressing a common-mode voltage of an inverter AC cable relative to ground are provided. A control unit generates a control signal according to a voltage of the AC side of the inverter. A switch unit connects or disconnects the discharge unit with ground or reference ground in response to the control signal. A discharge unit discharges the common-mode voltage of the inverter AC cable relative to ground when the switch unit is turned on. Therefore, during maintenance of the inverter when the AC switch is turned off, the common-mode voltage of the AC cable relative to ground can be discharged without using the isolated sampling solution in the conventional technology which has a high implementation cost and has a high requirement on the insulation class of the components, thereby avoiding the risk of electric shock to the maintenance technician.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.