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Charge redistribution circuit

  • US 8,324,862 B2
  • Filed: 11/30/2005
  • Issued: 12/04/2012
  • Est. Priority Date: 12/23/2004
  • Status: Active Grant
First Claim
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1. A charge redistribution circuit for an energy storage unit (1) with several storage elements (4) which are connected in series, the circuit comprising:

  • two or more charge redistribution control units (5) for monitoring a voltage and redistributing a charge, and each control unit is assigned an energy sub-group (3) of a plurality of storage elements (4), wherein each of the charge redistribution control units use energy from the assigned sub-group as an energy supply, and are supplied with a voltage which is higher than the voltage of an individual storage element (4) and lower than the voltage of the energy storage unit (1), and the charge redistribution circuit (2) is established in such a manner that a voltage monitoring and—

    when necessary—

    a charge redistribution is achieved between individual storage elements (4) within the energy sub-group and wherein in order to distribute the charge among the storage elements (4), the charge redistribution control units (5) are equipped with voltage converters, internal to the sub-groups, which are assigned to the individual storage elements (4), and with a voltage converter (8) which is assigned in each case to one of the sub-groups (3) in order to redistribute the charge among the sub-groups to each other, wherein the charge redistribution is achieved in such a manner that the charge is distributed between the storage elements (4) which belong to a sub-group (3), and the charge is distributed among the energy storing sub-groups (3).

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