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Power supply control module for a battery control system of an appliance, and a battery equipped with such a module

  • US 5,438,252 A
  • Filed: 11/24/1992
  • Issued: 08/01/1995
  • Est. Priority Date: 11/25/1991
  • Status: Expired due to Fees
First Claim
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1. A power supply control module for a supply battery (1) for use in an appliance power supply control system (3) which controls the supply of power to the appliance (2), said power supply control module controlling the supply of operating current to the power supply control system (3), and having input terminals (G1, G3) adapted to be connected to a battery and to a battery charger,said control module comprising a current detector circuit (5) associated with a switch circuit (4) placed in a power loop which includes said input terminals (G1, G3) and via which the battery supplies operating power to the appliance, said detector circuit comprising:

  • a shunt resistor (9) having terminals and being inserted in series with the switch circuit in the power loop via which the appliance is powered;

    an operational amplifier means (8) which is connected as a comparator so as to have low consumption, and which functions as a battery current detector when the battery is connected in series with the power loop and a battery charger is connected across the feed terminals (G1, G3);

    a diode (19) having terminals;

    a calibration resistor 18;

    the operational amplifier means (8) being connected to the terminals of the shunt resistor, and, via the shunt resistor, to said terminals of said diode (19), said diode being placed in series with said calibration resistor (18) in a branch that is in parallel with the switch circuit, the operational amplifier means (8) supplying an output current only when either there flows through the shunt resistor and through the switch circuit a fast battery charge current that is higher than one predetermined value, or else there appears across the terminals of the diode a voltage that corresponds to a trickle charge current which flows through the diode and which is higher than another predetermined value which is in turn much lower than the one predetermined value; and

    an interface logic circuit means (6), connected to said current detector circuit (5) and to said switch circuit (4), responsive to the output current from said operational amplifier means (8) to supply operating current to the power supply control system.

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