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Multiplex voltage measurement apparatus

  • US 6,677,758 B2
  • Filed: 03/28/2003
  • Issued: 01/13/2004
  • Est. Priority Date: 04/10/2000
  • Status: Expired due to Term
First Claim
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1. A multiplex voltage measurement apparatus, comprising:

  • (N+1) voltage detection terminals connected to N serially connected voltage sources;

    a capacitor which is charged with a voltage value of any of the N voltage sources;

    a first sample switch for selectively connecting odd-numbered voltage detection terminals among the (N+1) voltage detection terminals to a first terminal of the capacitor;

    a second sample switch for selectively connecting even-numbered voltage detection terminals among the (N+1) voltage detection terminals of a second terminal of the capacitor;

    a voltage measurement circuit for measuring the voltage value stored in the capacitor;

    a third sample switch for connecting the first terminal and the second terminal of the capacitor to the voltage measurement circuit; and

    a polarity controller for controlling the first and second sample switches such that one of the N voltage sources is selected while the third sample switch is open, wherein a failure in the first and second sample switches is detected based on the voltage value measured by the voltage measurement circuit.

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