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Battery voltage measurement device
| Details |
Inventors: Yudahira, Hirofumi; Maki, Ichiro; Morimoto, Naohisa;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP); Toyota Jidosha Kabushiki Kaisha (Aichi, JP)
Primary Examiner: Chapman; John E.
Assistant Examiner: Kerveros; James
Attorney, Agent or Firm: Snell & Wilmer, LLP
A battery voltage measurement device includes: a plurality of first switching sections, wherein each pair of adjacent first switching sections sequentially selects two output terminals of each of a plurality of battery blocks included in a battery pack; a level change section for changing a level of a battery voltage of each battery block which is input to the level change section via the first switching section; an A/D conversion section for performing an A/D conversion of battery voltage data output from the level change section; and a reference voltage control section for controlling an output of a reference voltage of the level change section according to the polarity of the voltage input to the level change section. |
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DETAILED DESCRIPTION According to one aspect of the present invention, a battery voltage measurement device includes: a plurality of first switching sections, in which each pair of adjacent first switching sections sequentially selects two output terminals of each of a plurality of battery blocks included in a battery pack; a level change section for changing a level of a battery voltage of each battery block which is input to the level change section via the first switching section; an A/D conversion section for performing an A/D conversion of battery voltage data output from the level change section; and a reference voltage control section for controlling an output of a reference voltage of the level change section according to the polarity of the voltage input to the level change section.
With the above-described structure, a reference voltage control section controls an output of a reference voltage for a level change section according to inverted polarity of a voltage input to the level change section, so that each time the polarity of a voltage is inverted, the input voltage from the level change section to an A/D converter can be in an input voltage range of the A/D converter.
Thus, it is not necessary to restrictedly use only half the input voltage range of the A/D converter assigned to each of the opposite polarities as in a conventionally required manner, and the entire input voltage range of the A/D converter can be used, so that twice the resolution of a conventional A/D converter can be obtained, and the original resolution of the A/D converter can be entirely used.
According to one embodiment of the invention, the battery voltage measurement device may further include: a capacitance section for selectively storing a battery voltage of each of the battery blocks via the first switching section; and a second switching section for selectively applying the battery voltage stored in the capacitance section to the level change section, in which the level change section changes a level of the battery voltage stored in the capacitance section which is input to the level change section via the second switching section
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Electrical and Wave 
