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The main battery current sensor is installed in the main battery. The main battery current
sensor detects the amount and the direction of the current, going through the high voltage circuit, based
on the flux passing through the hall element. The two sensors that have different measuring
ranges are installed in the main battery current sensor. There are the main battery current
sensor (high) widely measuring the current changes and the main battery current sensor (low)
specifically measuring the current changes. The current value detected respectively is converted
into the voltage to output it into the BMU. This allows the BMU to monitor charge and discharge conditions
of the main battery.
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The main battery ground fault detector is installed in the main battery. The main battery ground
fault detector has the ground fault detection circuit. When a ground fault occurs in the high
voltage circuit, the main battery ground fault detector should output the voltage into the BMU.
This allows the BMU to detect the ground fault occurring in the high voltage circuit. The main
battery ground fault detector has a pre-check circuit. When the pre-check signal is input from
the BMU, the main battery ground fault detector should be quasi-state of detecting the ground fault.
The BMU detects this signal to check that the main battery ground fault detector normally operates.
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