| 摘要 |
A method is provided for detecting a failure of a rectifier (4) or a rectifier source (16) in context of an uninterruptible power supply. The method includes: measuring an input current (IDe) into the rectifier (4) from a primary power source (16); determining a rate of change (d/dt IDe) in the measured current; determining a current difference (IDe_error) between a reference current (IDe_cmd) and the measured current (IDe); measuring voltage output (VDCbus) by the rectifier; determining a voltage difference (VDC error) between a reference voltage (Vref) and the measured voltage (VDC Bus); and detecting a failure condition of the rectifier (4) as a function of the measured input current (IDe), the rate of change in the measured current (d/ dt IDe), the current difference (IDE error), the measured voltage (VDC Bus) and the voltage difference (VDC error). More specifically, a failure condition of the rectifier is identified when the input current (IDe) is decreasing and the rate of change in the measured current (d/dt IDe) is decreasing and the current difference (IDe error) is increasing and the voltage difference (VDC error) is increasing. |
