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Control device for power semiconductor switch

  • US 10,644,687 B2
  • Filed: 03/25/2019
  • Issued: 05/05/2020
  • Est. Priority Date: 03/28/2018
  • Status: Active Grant
First Claim
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1. A control device for a power semiconductor switch, having a first and a second load current terminal and a control terminal, comprising:

  • a first electrical control device terminal, provided for electrical connection with the first load current terminal;

    a second electrical control device terminal, provided for electrical connection with the control terminal;

    an actuating device, which is designed, in accordance with a control signal (A), to generate a first actuating voltage on its first output for the switching on of the power semiconductor switch, and to generate a second actuating voltage on its second output for the switching off of the power semiconductor switch, in a mutually alternating manner;

    a first current path, which connects the first output of the actuating device to a circuit node of the control device in an electrically conductive manner;

    a second current path, which connects the second output of the actuating device to the circuit node of the control device in an electrically conductive manner, wherein the second current path incorporates an electrical switching off resistor (Roff) which is electrically connected in-circuit between the second output of the actuating device and the circuit node of the control device;

    a third current path, which connects the circuit node of the control device to the second control device terminal in an electrically conductive manner; and

    an switching off acceleration circuit, which is electrically connected in parallel with the switching off resistor (Roff), comprising a diode, an electrical resistor, and a capacitor which is electrically connected in parallel with said resistor, wherein the cathode of the diode is connected to a second electrical terminal of the capacitor in an electrically conductive manner, and a first electrical terminal of the capacitor is connected to a first electrical terminal of the switching off resistor (Roff), which is electrically oriented towards the actuating device in an electrically conductive manner, and the anode of the diode is connected to a second electrical terminal of the switching off resistor (Roff) in an electrically conductive manner.

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