SHORT CIRCUIT DETECTION CIRCUIT AND SHORT CIRCUIT DETECTION METHOD FOR MULTI-PHASE RECTIFIER AT FREQUENCY DOMAIN

摘要

A short circuit detection circuit and a short circuit detection method for a multi-phase rectifier are provided, which are used for detecting conditions of a spectrum of a FWR signal outputted from the multi-phase rectifier in the frequency domain. Next, determining whether the detected signal indicating the amplitude of the frequency of the AC signal is greater than or equal to the reference signal, so as to determine whether the multi-phase rectifier has a short circuit condition. Therefore, the short circuit detection circuit and the short circuit detection method do not have any requirements for configuring a short circuit detection element on each current path of the multi-phase rectifier, so that the power loss and the cost can be reduced effectively.

主权项

1. A short circuit detection circuit for a multi-phase rectifier, the multi-phase rectifier having a plurality of bridges connected in parallel, each bridge having two rectifying elements connected in series and a phase signal point (PSP) configured between the two rectifying elements, each PSP receiving an alternating current (AC) signal, each AC signal having a same frequency, the multi-phase rectifier rectifying the AC signals to output a full-wave rectified (FWR) signal, and the short circuit detection circuit comprising:
a spectrum analyzing unit, receiving the FWR signal and analyzing a spectrum of the FWR signal in the frequency domain based on the same frequency of the AC signals to generate a detected signal indicating an amplitude of the same frequency of the AC signals; and a determination unit, electrically connected to the spectrum analyzing unit and receiving the detected signal and a reference signal to determine whether the detected signal is greater than or equal to the reference signal; wherein when the determination unit determines that the detected signal is greater than or equal to the reference signal, the determination unit outputs a result signal indicating that a short circuit condition exists among one of the rectifier elements within the bridges.