Patent ID: 9025350
Filing Date: 2015-05-05
Classification: H02M

Abstract:
1. A bypass module of a power cell in a cascaded H-Bridge medium voltage drive, configured for bypassing a major circuit module of the power cell, wherein the major circuit module comprises a fuse, a rectifier, a bus capacitor and an H-Bridge inverter, two points led from the H-Bridge inverter respectively being configured as a first output end and a second output end of the major circuit module, the bypass module comprising a bypass circuit, wherein, the bypass circuit comprises a first bridge arm and a second bridge arm, the first bridge arm has at least one of a first switch element and a second switch element, the second bridge arm has at least one of a first diode and a second diode; a point led from the first bridge arm of the bypass circuit is configured as a first input end of the bypass circuit, a point led from the second bridge arm of the bypass circuit is configured as a second input end of the bypass circuit, the first input end is electrically connected with the first output end of the major circuit module, and the second input end is electrically connected with the second output end of the major circuit module; and when the major circuit module malfunctions and the bypass circuit is switched on for operation, one of the first switch element and the second switch element and one of the first diode and the second diode of the bypass circuit turn on to bypass the major circuit module of corresponding power cell.