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Drive circuit of transistor

  • US 10,574,224 B2
  • Filed: 08/23/2018
  • Issued: 02/25/2020
  • Est. Priority Date: 02/24/2016
  • Status: Active Grant
First Claim
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1. A drive circuit of a transistor, comprising:

  • a high-voltage power supply and a low-voltage power supply;

    a circuit of a high-voltage power supply domain and a circuit of a low-voltage power supply domain circuit, wherein the high-voltage power supply domain circuit is connected to the high-voltage power supply, and the low-voltage power supply domain circuit is connected to the low-voltage power supply;

    an electrostatic discharge apparatus, wherein the electrostatic discharge apparatus is separately disposed between electrodes of the high-voltage power supply, between electrodes of the low-voltage power supply, and between a positive electrode of the high-voltage power supply and a negative electrode of the low-voltage power supply;

    a level shifter circuit, wherein the level shifter circuit comprises a level detection circuit, a current limiting module, a discharge module, and a switch transistor;

    the level detection circuit is connected to the positive electrode of the high-voltage power supply and is separately connected to the current limiting module, the discharge module, and the high-voltage power supply domain circuit;

    the current limiting module is further connected to a first end of the switch transistor;

    the discharge module is further connected to a negative electrode of the high-voltage power supply;

    a control end of the switch transistor is connected to the low-voltage power supply domain circuit and a second end of the switch transistor is connected to the negative electrode of the low-voltage power supply, the current limiting module is configured to limit the discharged current when the drive circuit performs electrostatic discharge, and the discharge module is configured to form a discharge assisting path between the negative electrode of the high-voltage power supply and the first end of the switch transistor to assist electrostatic discharge of the drive circuit;

    a protective circuit, wherein the protective circuit is disposed between the second end of the switch transistor and the negative electrode of the low-voltage power supply,wherein the protective circuit comprises;

    a second resistor, wherein one end of the second resistor is connected to the second end of the switch transistor, and the other end of the second resistor is connected to the negative electrode of the low-voltage power supply; and

    a first electrostatic discharge device, wherein the first electrostatic discharge device is connected to the second resistor in parallel.

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