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Battery balance circuit and battery apparatus thereof

  • US 10,348,100 B2
  • Filed: 08/08/2016
  • Issued: 07/09/2019
  • Est. Priority Date: 08/31/2015
  • Status: Active Grant
First Claim
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1. A battery balance circuit configured for a battery apparatus having two batteries coupled in series, the battery balance circuit comprising:

  • a) first and second capacitors respectively coupled to two terminals of said two batteries;

    b) first and second switching circuits respectively coupled to said two terminals of said two batteries, wherein said first and second switching circuits are configured to control charging or discharging of each of said two batteries;

    c) a third capacitor coupled between said first and second switching circuits, wherein said third capacitor is configured to store or release energy in order to balance battery levels between said two batteries;

    d) parasitic inductors, wherein said third capacitor and said parasitic inductors are configured to resonate, and said first and second switching circuits are configured to operate at a resonance frequency; and

    e) a current zero-crossing detecting circuit configured to sample a current through said third capacitor, and to change switching states of transistors in said first and second switching circuits when said sampled current crosses zero.

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