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Drive circuit

A technology for driving circuits and circuits, applied in circuits, electronic switches, electrical components, etc., can solve the problem of low withstand voltage between gate and source

Pending Publication Date: 2020-03-31
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] In addition, the withstand voltage of the drain-source voltage (hereinafter referred to as "Vds") of NMOSFET 1 and PMOSFET 2 is as high as 10 [V] or more, but the gate-source voltage (hereinafter referred to as "Vgs") The withstand voltage is as low as 5[V]

Method used

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Embodiment Construction

[0069] Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are attached to the same or similar parts. However, it should be noted that the drawings include schematic drawings, and the vertical and horizontal dimensions and scales of members or parts may be different from actual ones. Therefore, sometimes the specific size and scale should be judged with reference to the following description. In addition, it is needless to say that there are parts in which the dimensional relationship and the ratio are different among the drawings.

[0070] In addition, the embodiments shown below are examples of devices and methods for realizing the technical idea of ​​the present invention, and the technical idea of ​​the present invention does not specify the material, shape, structure, arrangement, etc. of the components as follows: Material, shape, structure, con...

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Abstract

The present invention provides a drive circuit capable of suppressing a voltage applied to an output-stage transistor to a withstand voltage or less by switching a resistance value of a resistor for pulling down a gate of the output-stage transistor in accordance with a magnitude of a voltage of a high-voltage power supply system. The drive circuit includes a gate capacitance discharge circuit that reduces a resistance value of a resistor for pulling down the gate of a PMOSFET (2) at the output stage for a predetermined period at the timing when an NMOSFET (1) turns on and a pull-down resistorswitching circuit that switches pull-down resistors of the gate capacitance discharge circuit, based on a divided voltage into which voltage of the high voltage power supply system is divided, in which the pull-down resistor switching circuit, when the divided voltage is higher than a reference voltage Vref, switches the pull-down resistor for the predetermined period to a resistor (9) and, whenthe divided voltage is the reference voltage Vref or lower, switches the pull-down resistor to a resistor (7') having a higher resistance value than the resistor (9).

Description

technical field [0001] The present invention relates to a driving circuit, which generates a low-voltage control signal for driving transistors, MOSFET (Metal Oxide Semiconductor Field Effect Transistor: Metal Oxide Semiconductor Field Effect Transistor), IGBT (Insulated Gate Bipolar Transistor: Insulated Gate Bipolar Transistor) Type transistors) and other high-voltage signals for switching devices. Background technique [0002] In electronic equipment such as televisions and personal computers, it is necessary to convert AC power to DC power, convert the voltage level of DC power, etc., and convert the input voltage to the most suitable output voltage for the components used in the equipment. power supply unit. Therefore, conventionally, switching power supplies with high conversion efficiency have been widely used. [0003] The switching power supply is composed of switching devices such as MOSFETs and IGBTs, transformers, capacitors, etc., and the voltage is converted ...

Claims

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Application Information

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IPC IPC(8): H03K17/687H03K17/081
CPCH03K17/687H03K17/08104H03K2217/0081H03K17/04123H03K17/08122H03K2217/0036H03K2217/0063H02M1/08H02M1/32H02M3/156H02M3/335H02M1/0006
Inventor 菅原敬人
Owner FUJI ELECTRIC CO LTD