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VEHICULAR POWER SUPPLY SYSTEM

  • US 20120268058A1
  • Filed: 07/13/2011
  • Published: 10/25/2012
  • Est. Priority Date: 04/19/2011
  • Status: Active Grant
First Claim
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1. A vehicular power supply system, comprising:

  • a lead battery;

    a lithium-ion battery that can be charged and discharged at a voltage higher than the lead battery'"'"'s voltage;

    a step-down DC-DC converter that is connected between the lead battery and the lithium-ion battery and whose output voltage is controllable;

    a generator connected with the step-down DC-DC converter and the lithium-ion battery;

    a lithium-ion battery SOC detection means for detecting a state of charge of the lithium-ion battery;

    a relay for the lithium-ion battery by which the lithium-ion battery is connected to and disconnected from the generator and the step-down DC-DC converter; and

    a control means, based on the state of charge of the lithium-ion battery, for taking control of switching on and off the relay for the lithium-ion battery.

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