×

DC powered capacitive pulse charge and pulse discharge battery charger

  • US 4,016,473 A
  • Filed: 11/06/1975
  • Issued: 04/05/1977
  • Est. Priority Date: 11/06/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. A battery charger comprising:

  • power connector means for removable conductive connection to an external source of direct current power;

    a first node conductively connected to said power connector to receive and transmit electrical energy;

    a first inductor to receive, store and transmit received and stored electrical energy having an input conductively connected to said first node and an output;

    a second node conductively connected to said output of said first inductor to receive and transmit electrical energy;

    first switching means having an output and an input which is conductively connected to said second node, and having a first state in which said switching means is conductive to receive and transmit electrical energy received from said second node and a second state in which said switching means is nonconductive to not transmit electrical energy, said switching means automatically switching between said first state and said second state in accordance with preselected electrical signals sensed by said switching means;

    a third node conductively connected to said output of said first switching means to receive and transmit electrical energy;

    a second inductor to receive, store and transmit received and stored electrical energy having an input conductively connected to said third node and having an output;

    output connector means conductively connected to said output of said second inductor which is removably conductively connectable to a battery to be charged to receive and transmit electrical energy;

    a capacitor conductively connected to said third node to receive, store and transmit electrical energy;

    second switching means conductively connected to said capacitor and to said second node to switch said capacitor between a series circuit and parallel circuit configuration with respect to said first and second inductors;

    temperature sensing means positioned to sense the temperature of the battery to be charged and generate an electrical signal reflective of said temperature;

    control means conductively connected to said first node to receive electrical energy therefrom, to said temperature sensing means to receive said temperature reflective electrical signal therefrom, to said battery to receive an electrical signal reflective of the voltage across said battery, and to said second switching means to supply control signals thereto, said control means generating said control signals to repetitiously cause said capacitor to be first charged in parallel circuit through said first switching means and discharged in series with said first and second inductors to pulse charge said battery to be charged and thereafter cause a brief pulse discharge of said battery, the repetition rate of said charge and discharge pulses varying based on the state of charge of the battery to be charged as determined by said control means from the battery voltage signal and temperature reflective signal.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×