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Buck-boost converter with dual-mode control for battery charging

  • US 4,536,696 A
  • Filed: 07/14/1983
  • Issued: 08/20/1985
  • Est. Priority Date: 07/14/1983
  • Status: Expired due to Term
First Claim
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1. A battery charging circuit comprisinga flyback converter circuit including input means for accepting a source of energy and output means for accepting a battery to be charged,charging control means for regulating charging of the battery includinga high-rate charge control providing a constant current for charging the battery and regulated by sensing a first current in a power switching device of the converter circuit,a low-rate charge control providing a second current lower in value than the first current and which is controlled by a voltage responsive to a voltage level at the output means, andmeans for selecting when the low-rate charge control is active in response to a voltage level at the output means.

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