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Power supply apparatus for induction heating

By connecting multiple capacitors in parallel at the inverter input end of the induction heating power supply equipment and using bus bar connections to reduce the conductive path, the problem of surge voltage in the inverter is solved and effective protection of power semiconductor devices is achieved.

Inactive Publication Date: 2018-03-06
NETUREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive surge voltage can cause damage to power semiconductor devices

Method used

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  • Power supply apparatus for induction heating
  • Power supply apparatus for induction heating
  • Power supply apparatus for induction heating

Examples

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Embodiment Construction

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 An example of a power supply device 1 according to an embodiment of the present invention is shown. The power supply device 1 is used for induction heating.

[0013] The power supply device 1 has a DC power supply 4 , a smoothing filter 5 , and an inverter 6 . The DC power supply 4 includes an inverter 3 configured to convert the AC power supplied from the commercial AC power supply 2 into DC power. The smoothing filter 5 is configured to smooth the pulsating current of the direct current output from the direct current power supply 4 . The inverter 6 is configured to convert the direct current that has been smoothed by the smoothing filter 5 into high frequency alternating current.

[0014] The inverter 6 has a pair of power semiconductor devices Q1, Q2 connected in series and another pair of power semiconductor devices Q3, Q4 also conne...

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PUM

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Abstract

A power supply apparatus for induction heating is provided. The power supply apparatus includes a smoothing filter configured to smooth a pulsating current of DC power output from a DC power supply, and an inverter configured to convert the DC power that has been smoothed by the smoothing filter into AC power. The smoothing filter includes a plurality of capacitors having different internal inductances and connected to each other in parallel between input terminals of the inverter, each of the capacitors being connected to the input terminals of the inverter directly or through a pair of bus bars. The plurality of capacitors includes a first capacitor and a second capacitor, the first capacitor having smaller internal inductance than the second capacitor and a shorter conductive path between the input terminals of the inverter than the second capacitor.

Description

technical field [0001] The invention relates to a power supply device for induction heating Background technique [0002] A related art power supply device is configured to supply alternating current to a heating coil for induction heating, wherein a workpiece placed in the magnetic field is passed through a magnetic field induced in the workpiece by forming a magnetic field through the heating coil due to the alternating current supplied to the heating coil. heating by electric current. Power supply equipment generally converts AC power from a commercial power supply to DC power with a converter, smoothes the pulsating current of the DC power with a capacitor, and converts the smoothed DC power into AC power with an inverter to generate high-frequency AC power to be supplied to heating coils ( See, eg, JP 2009-277577A). [0003] Inverters generally include multiple pairs of power semiconductor devices (switching devices) connected in series, and the pairs are connected in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06H02M7/48
CPCH02M7/48H05B6/06H01G4/30H01G4/33H02M1/14H05B6/04H02M1/0064H02M7/5387
Inventor 金井隆彦杉本真人吉田春树
Owner NETUREN CO LTD
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