Insulated gate device drive apparatus

Patent metadata

Field	Value
Publication number	US-10756728-B2
Application number	US-201916699401-A
Country	US
Kind code	B2
Filing date	Nov 29, 2019
Priority date	Dec 19, 2018
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

An insulated gate device drive apparatus for driving an insulated gate device by using a charging current outputted from a totem-pole output circuit constituted by a high-side output transistor and a low-side output transistor. The insulated gate device drive apparatus includes a charging current correction circuit configured to perform correction to increase the charging current that is decreased by an increased voltage drop of high-side wiring resistance between a power supply and the high-side output transistor.

First claim

What is claimed is:

1. An insulated gate device drive apparatus that drives an insulated gate device by using a charging current outputted from a totem-pole output circuit constituted by a high-side output transistor and a low-side output transistor, the insulated gate device drive apparatus comprising:
a charging current correction circuit configured to perform correction to increase the charging current that is decreased by an increased voltage drop of high-side wiring resistance between a power supply and the high-side output transistor.

2. The insulated gate device drive apparatus according to claim 1 , wherein the charging current correction circuit includes:
a differential amplifier circuit configured to amplify a potential difference between a first potential at a connection point of the high-side output transistor and the high-side wiring resistance and a second potential at a connection point of the high-side wiring resistance and the power supply, to thereby output a correction voltage;
an adder circuit configured to add the correction voltage outputted by the differential amplifier circuit to a reference voltage externally applied for setting the charging current; and
an inverting amplifier circuit configured to invert the polarity of an output voltage of the adder circuit and supply the output voltage to a circuit that generates the charging current.

3. An insulated gate device drive apparatus that drives an insulated gate device by causing a totem-pole output circuit constituted by a high-side output transistor and a low-side output transistor to sink a discharging current from the insulated gate device, the insulated gate device drive apparatus comprising:
a discharging current correction circuit configured to perform correction to increase the discharging current that is decreased by an increased voltage drop of low-side wiring resistance between the low-side output transistor and a ground terminal.

4. The insulated gate device drive apparatus according to claim 3 ,
wherein the discharging current correction circuit includes a voltage drop detection circuit configured to detect a voltage drop that is caused when the discharging current flows through the low-side wiring resistance, and a bypass circuit connected in parallel with a series circuit of the low-side output transistor and the low-side wiring resistance, and
wherein, when a value of the voltage drop detected by the voltage drop detection circuit exceeds a predetermined value, a part of the discharging current flows through the bypass circuit.

5. The insulated gate device drive apparatus according to claim 4 , wherein the bypass circuit is a switch element configured to be connected to both ends of the series circuit of the low-side output transistor and the low-side wiring resistance and to be set to on when the detected value of the voltage drop exceeds the predetermined value.

6. A drive apparatus for driving an insulated gate device, comprising:
a totem-pole output circuit including a high-side output transistor and a low-side output transistor, the high-side output transistor being connected to a power supply via high-side wiring resistance, the totem-pole output circuit outputting a charging current to drive the insulated gate device; and
a charging current correction circuit connected to the high-side wiring resistance, and being configured to perform correction to increase the charging current that is decreased by an increased voltage drop of the high-side wiring resistance.

7. A drive apparatus for driving an insulated gate device, comprising:
a totem-pole output circuit including a high-side output transistor and a low-side output transistor, the low-side output transistor being connected, via low-side wiring resistance, to a ground terminal, the totem-pole output circuit being configured to sink a discharging current from the insulated gate device; and
a discharging current correction circuit connected to the low-side wiring resistance, and being configured to perform correction to increase the discharging current that is decreased by an increased voltage drop of the low-side wiring resistance.

Assignees

• Fuji Electric Co Ltd

Inventors

• Mori Takahiro
• Iwamoto Motomitsu

Classifications

• H03K2217/0018

  Special modifications or use of the back gate voltage of a FET · CPC title

• H03K17/04206 Primary

  in field-effect transistor switches · CPC title

• H03K2217/0027

  Measuring means of, e.g. currents through or voltages across the switch · CPC title

• H03K2217/0081

  Power supply means, e.g. to the switch driver · CPC title

• H03K17/602 Primary

  in integrated circuits · CPC title