Patent ID: 9316682
Filing Date: 2016-04-19
CPC Classification: G01R

Claim Text:
1. A fault diagnosis method for freewheeling diodes of power converter of a switched reluctance motor with two main switch tubes per phase, comprising arranging two current sensors on a power converter with the two main switch tubes per phase, wherein, one current sensor LEM 1 is used to detect the total current of the two main switch tubes connected to a DC bus, and the other current sensor LEM 2 is used to detect the total feedback current of the freewheeling diodes connected to the DC bus, wherein: (1) supplying power to the power converter, and keeping both an upper main switch tube and a lower main switch tube operating normally without fault; if neither the upper main switch tube nor the lower main switch tube is in ON state, the current sensor LEM (2) supplying power to the power converter, and keeping both the upper main switch tube and the lower main switch tube operating normally without fault; if neither the upper main switch tube nor the lower main switch tube is in ON state, but the current detected by the current sensor LEM (3) supplying power to the power converter, switching on both the upper main switch tube and the lower main switch tube at the same time first, and then switching off both the upper main switch tube and the lower main switch tube at the same time; if the current sensor LEM