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Voltage monitoring module and voltage monitoring system which compares voltages to determine leakage

  • US 9,945,910 B2
  • Filed: 02/24/2012
  • Issued: 04/17/2018
  • Est. Priority Date: 03/31/2011
  • Status: Active Grant
First Claim
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1. A voltage monitoring module comprising:

  • a first input terminal coupled to a high-voltage-side terminal of a battery cell through a first path including an external resistor;

    a first terminal coupled to the high-voltage-side terminal of the battery cell through a second path;

    a first switch coupled to the first input terminal;

    a second switch coupled to the first terminal;

    a second input terminal and a second terminal coupled to a low-voltage-side terminal of the battery cell;

    a third switch that is coupled to the second input terminal;

    a fourth switch that is coupled to the second terminal; and

    a control circuit that controls ON/OFF of the first through fourth switches, whereinan element that suppresses fluctuation of a voltage input to the first switch through the first input terminal that is coupled between the first switch and a fixed voltage, andthe control circuit controls the first through the fourth switches, such that a plurality of potential differences between the first path and the second path are compared between points among the first input terminal, second input terminal, first terminal, second terminal, and first through fourth switches to determine a current leak.

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