| 摘要 |
PROBLEM TO BE SOLVED: To provide a short circuit detection method and a short circuit detection circuit method for a three-phase (or three-or-more-phase) rectifier applied to an alternator or an ISG.SOLUTION: The short circuit detection method and the short circuit detection circuit applied to a multi-phase rectifier detect conditions of a spectrum of a full-wave rectification signal outputted from the multi-phase rectifier. Next, the method and the circuit determine whether the detected signal indicating the amplitude of a frequency of an AC signal is greater than or equal to a reference signal or not to determine whether the multi-phase rectifier has a short circuit condition or not. Therefore, in the short circuit detection circuit and the short circuit detection method relating to this invention, it is unnecessary to provide a short circuit detection element for each current path of the multi-phase rectifier, so that the energy loss and the cost are reduced effectively. |
