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BATTERY MONITORING SYSTEM AND SEMICONDUCTOR DEVICE

  • US 20130257441A1
  • Filed: 03/15/2013
  • Published: 10/03/2013
  • Est. Priority Date: 03/30/2012
  • Status: Active Grant
First Claim
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1. A battery monitoring system comprising:

  • a plurality of battery cell sets of a specific number plurality of serially connected battery cells;

    a plurality of semiconductor devices that are each respectively provided to each of the plurality of battery cell sets and that each measure battery voltage of the corresponding battery cell set, wherein;

    each of the semiconductor devices comprisesa measuring section that measures the battery voltage of the corresponding battery cell set,a high side communication section that is supplied with a drive voltage in a first voltage range, and, when a semiconductor device is present at a higher position that operates at a higher operating voltage than the operating voltage of the semiconductor device itself when measuring a battery cell set on the high side of the battery cell set measured by the semiconductor device itself, is capable of performing communication with the high side semiconductor device,a low side communication section that is supplied with a drive voltage in a second voltage range, and, when a semiconductor device is present at a lower position that operates at a lower operating voltage than the operating voltage of the semiconductor device itself when measuring a battery cell set on the low side of the battery cell set measured by the semiconductor device itself, is capable of performing communication with the low side semiconductor device, anda communication level converter that converts in both directions between the first voltage range of the high side communication section and the second voltage range of the low side communication section, that is capable of converting a high side communication signal input from the high side communication section to a low side communication signal and outputting the converted signal to the low side communication section, and that is capable of converting a low side communication section input from the low side communication section to a high side communication section and outputting the converted signal to the high side communication section;

    the semiconductor device at the highest stage in communication between the semiconductor devices further comprises a signal level determination section that detects the first voltage range of the high side communication section, and that determines the level of the low side communication signal that the communication level converter outputs to the low side communication section when the first voltage range is narrower than a specific voltage range; and

    the first voltage range of the highest stage is set to a specific voltage range narrower than the first voltage range of another of the semiconductor devices.

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