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Voltage balance circuit, voltage detecting circuit, voltage balancing method, and voltage detecting method

  • US 7,583,057 B2
  • Filed: 09/27/2007
  • Issued: 09/01/2009
  • Est. Priority Date: 10/01/2001
  • Status: Expired due to Fees
First Claim
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1. A voltage detection circuit that detects a voltage between both polarities of each storage circuit of a plurality of storage circuits (B1, B2, B3) connected to one another in series, comprising:

  • a plurality of first capacitors (67, 68, 69);

    a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3) and the other end connected to one electrode of said each first capacitor (67, 68, 69);

    a charging switch (71) having one end connected in common to the other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to a node that sets a reference electric potential;

    a second capacitor (72) having one electrode connected to the other end of said charging switch (71);

    a plurality of second switches (61, 63, 65) each having one end connected to the other electrode of said each storage circuit (B1, B2, B3) and the other end connected to said one electrode of said each first capacitor (67, 68, 69);

    a voltage applying switch (70) having one end connected in common to said other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to the other electrode of said second capacitor (72);

    a pair of measuring terminals connected to both ends of said second capacitor (72); and

    a control section (39) that controls said plurality of first switches (62, 64, 66), said charging switch (71), said plurality of second switches (61, 63, 65) and said voltage applying switch (70), and show a voltage between both polarities of said selected storage circuit (B1, B2, B3) for detection to said pair of measuring terminals as output, wherein the control section (39) selects one storage circuit (B1, B2, B3) from said plurality of storage circuits (B1, B2, B3), turn on said first switch (62, 64, 66) having one end connected to said selected storage circuit (B1, B2, B3) and said charging switch (71) to charge said first capacitor (67, 68, 69) with the voltage of one electrode of said selected storage circuit (B1, B2, B3), and turn off said plurality of first switches (62, 64, 66) and said charging switch (71), and turn on said second switch (61, 63, 65) and said voltage applying switch (70) to make said first capacitor (67, 68, 69) and said second capacitor (72) connected in series and apply the voltage of the other electrode of said selected storage circuit (B1, B2, B3) to said first capacitor (67, 68, 69) and said second capacitor (72), and make the voltage applied to said second capacitor (72) outputted at said pair of measuring terminals as the voltage between both polarities of said selected storage circuit.

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