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d.c. Blocking oscillator charging device for electric vehicles

  • US 4,423,476 A
  • Filed: 03/12/1981
  • Issued: 12/27/1983
  • Est. Priority Date: 03/12/1980
  • Status: Expired due to Fees
First Claim
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1. A charging device, particularly a vehicle-bound charging device for charging the traction batteries of an electric vehicle from the a.c. current mains comprising:

  • a converter module;

    comprising at least two d.c. blocking converters, each converter including a controlled power transistor, a cutoff relief circuit, and a power transformer, wherein the secondary winding is connected in series with a rectifier diode, and a smoothing capacitor is connected in parallel to this series circuit,the power transistors of each converter are activated by a control circuit in the push-pull mode with a phase shift of 180°

    , andthe parallel-connected secondary sides of the two blocking converters are connected in such a way that the one secondary winding, on the one hand, is connected to the negative output terminal and, on the other hand, via the one rectifier diode to the positive output terminal;

    the other secondary winding is connected, on the one hand, to the positive output terminal and, on the other hand, via the other rectifier diode to the negative output terminal;

    a first diode is connected as the relief circuit on the secondary side from the junction point of the one secondary winding with the one rectifier diode to a first point, from the latter a second diode is connected in series with a choke to a second point, and from the latter a third diode is connected to the junction point of the other secondary winding with the other rectifier diode,wherein all diodes on the secondary side are poled in such a way that they are current-conductive away from one secondary winding and/or toward the other secondary winding, andwherein respectively one capacitor is connected between said first point and the positive output terminal and between said second point and the negative output terminal; and

    that a smoothing capacitor common to all is provided between the output terminals.

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