| 摘要 |
A battery ground fault detecting circuit applied to an uninterruptible power system is disclosed. The uninterruptible power system has a controller and is connected to a battery box having a ground terminal. The battery ground fault detecting circuit is employed for detecting whether a ground fault is occurred in a battery mounted in the battery box, so that the controller can execute a corresponding protection procedure. The battery ground fault detecting circuit includes a detector electrically connected to the ground terminal of the battery box for detecting a ground current signal outputted from the ground terminal, a signal processor electrically connected to the detector for filtering and amplifying the ground current signal, a peak value comparator electrically connected to the signal processor and having a predetermined peak value for comparing the filtered and amplified ground current signal with the predetermined peak value so as to generate an AC control signal when the peak value of the ground current signal is larger than the predetermined peak value, and a signal converter electrically connected to the peak value comparator for converting the AC control signal into a DC control signal and transmitting the DC control signal to the controller for executing a corresponding protection procedure to the uninterruptible power system in response to the DC control signal.
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