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Driver for switching device

a switching device and driver technology, applied in the direction of electronic switching, pulse technique, electric apparatus, etc., can solve the problems of electromagnetic noise generated to affect external electronic instruments, the switching device itself collapses, and the design freedom is limited

Inactive Publication Date: 2007-11-01
OTOSHI KOTA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach allows for improved design freedom by selectively adjusting the rate of voltage variation and power source utilization to suppress electromagnetic noise and heat generation, enhancing the performance of switching devices across different operational conditions.

Problems solved by technology

As a result, the switching device itself collapses or electromagnetic noise is generated to affect external electronic instruments.
However, a switching loss on the switching device 11 which turns into heat also increases so as to cause troublesome.
Therefore, the degree of freedom on design is limited, and the resistance value is difficult to select so as to perform inherent function of the switching device.

Method used

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Examples

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Embodiment Construction

[0024] A first preferred embodiment of the present invention will now be described with reference to FIGS. 1 through 3. The first preferred embodiment employs a driver for driving an H bridge circuit of an alternating-current inverter or an AC inverter.

[0025] Now referring to FIG. 1, the diagram illustrates a circuit diagram of an AC inverter 1 according to the first preferred embodiment of the present invention. The AC inverter 1 includes switching devices SW1, SW2, SW3 and SW4, an H bridge circuit 2, a driver 4 and an overcurrent detector 6. The H bridge circuit 2 is connected to a direct-current power source or a DC power source E. Each of the switching devices SW1 through SW4 employs an N-channel metal-oxide-semiconductor field-effect-transistor (an “N-channel MOSFET”). The switching devices SW1, SW2 are connected to the positive side of the DC power source E in the switching devices of the H bridge circuit 2. Each drain of the switching devices SW1, SW2 is connected to a posit...

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PUM

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Abstract

A driver for a switching device has a plurality of driver circuits for driving the switching device and a control circuit. The control circuit selectively operates the driver circuits in response to a plurality of predetermined drive modes. Alternatively, a driver for a switching device has a driver circuit and a control circuit. The driver circuit is connected to a plurality of power sources. Each of the power sources has a different voltage. The control circuit selects one of the power sources for operating the driver circuit in response to a plurality of predetermined drive modes.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a divisional of co-pending U.S. application Ser. No. 10 / 607,481 filed on Jun. 25, 2003, and also claims the benefit of Japanese application serial No. 2002-186465 filed on Jun. 26, 2002 and No. 2002-186466 filed on Jun. 26, 2002.BACKGROUND OF THE INVENTION [0002] The present invention relates to a driver for a switching device. [0003] A driver for driving a switching device, such as a metal-oxide-semiconductor field-effect-transistor (a “MOSFET”), a bipolar transistor and an insulated gate bipolar transistor (an “IGBT”), is widely used for an inverter and a switching source. Referring to FIGS. 4 and 10, for example, in a switching circuit, as a driver 10 supplies an electric charge to a control terminal or a gate 11g of a switching device 11 so as to increase a control voltage Vgs above a predetermined value, electric current Id passes between a drain 11d and a source 11s. On the other hand, as the driver 10 draws an ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03K17/56H03K17/16H03K17/687
CPCH03K17/6871H03K17/165
Inventor OTOSHI, KOTASUZUKI, SADANORI
Owner OTOSHI KOTA