Power supply system having two different types of batteries and current-limiting circuit for lower output battery

  • US 4,056,764 A
  • Filed: 05/30/1975
  • Issued: 11/01/1977
  • Est. Priority Date: 06/03/1974
  • Status: Expired due to Term
  • ×
    • Pin Icon | RPX Insight
    • Pin
First Claim
Patent Images

1. In a power supply system of the type having a first battery and a second battery with a lower open-circuit voltage, higher maximum output current and lower total energy capacity than the first battery, and means connecting said first battery and said second battery to provide a power supply output current consisting of the total discharge currents from said first battery and said second battery;

  • the improvement comprising;

    said means connecting said first battery and said second battery including discharge current distribution means for discharging substantially only said first battery to develop the output current when the magnitude of the total discharge current is less than a certain predetermined value and for discharging both said first battery and said second battery when the total discharge current is greater than the certain predetermined value with said second battery supplying a current equal to the difference between the magnitude of the discharge current of said first battery and the total output current to maintain the magnitude of the discharge current of said first battery less than the certain predetermined value, wherein the certain predetermined value is selected below a critical current value at which a terminal voltage of said first battery equals an open-circuit voltage of said second battery;

    said discharge current distribution means comprising current measuring means for measuring the magnitude of the discharge current from said first battery, signal generating means for generating a current signal of said certain predetermined value, comparison means for comparing the magnitude of the discharge current measured by said current measuring means with said current signal to develop a control signal representative of the difference between the measured current and the predetermined current value, and current limiting means responsive to the control signal developed by said comparison means for limiting the maximum magnitude of the discharge current from said first battery to the certain predetermined value.

View all claims
  • 0 Assignments
    ×
    ×

    Thank you for your feedback

    ×
    ×