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Power supply device and power supply device for arc machining

A technology for power supply devices and power cords, applied in arc welding equipment, metal processing equipment, output power conversion devices, etc., can solve problems such as incomplete charging and discharging of auxiliary capacitors, and achieve the effect of reducing switching losses

Inactive Publication Date: 2013-04-24
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, at light load or no load, etc., charging and discharging of the auxiliary capacitor may not be complete.
The incomplete charging and discharging operation of the auxiliary capacitor leads to an increase in switching loss or damage to the switching element due to surge voltage, and therefore it is required to solve the above-mentioned problems.

Method used

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  • Power supply device and power supply device for arc machining
  • Power supply device and power supply device for arc machining
  • Power supply device and power supply device for arc machining

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0039] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0040] figure 1 The arc machining machine 10 provided with the power supply device 11 for arc machining of this embodiment is shown. The arc machining machine 10 supplies a DC voltage for machining output from the power supply unit 11 to a welding torch TH, and generates an arc from the welding torch TH to the object M to perform arc welding, arc cutting, etc. on the object M. Device for arc machining.

[0041] The arc machining power supply unit 11 corresponds to an input AC power supply of 200V, and includes a DC conversion circuit 12 for converting the AC voltage into a DC voltage, and an inverter circuit 13 for converting the DC voltage into a predetermined high-frequency AC voltage.

[0042] The DC conversion circuit 12 has: a primary-side rectification circuit DR1 for performing full-wave rectification on a three-phase input AC power source composed of a ...

no. 2 Embodiment approach

[0071] Hereinafter, a second embodiment of the present invention will be described with reference to the drawings.

[0072] image 3 The arc machining machine 10 provided with the power supply device 11a for arc machining of this embodiment is shown. The power supply device 11a for arc machining according to the present embodiment is compatible with an input AC power supply of 400V.

[0073] To describe in detail, in the DC conversion circuit 12a, two smoothing capacitors Ca, Cb of the same capacity are connected in series between the power supply lines L1, L2 on the output side of the primary side rectification circuit DR1.

[0074] In the auxiliary switch circuit 14a, the switching element S5 made of IGBT is arranged on the power supply line L1 of the subsequent stage of the smoothing capacitors Ca and Cb, and the switching element S6 made of IGBT is arranged on the power supply of the subsequent stage of the smoothing capacitors Ca and Cb. on line L2. The switching eleme...

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PUM

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Abstract

The present invention relates to a power supply device and a power supply device for arc machining. The invention provides the power supply device for reliably charging and discharging the auxiliary capacitor adopted by the soft switch control irrespectively with the load state, and can realize the reduction of switch loss or suppression of voltage surge. A resonance circuit (15) is set between the middle points (N1, N2) (output terminals) of each bridge arm of an inverter circuit (13). The resonance circuit (15) begins resonance movement before the switching-off of each switch component (S6)becoming the discharging starting of the auxiliary capacitor (C1) and generates a vibrating current which enlarges based on the output current of the switch components (S1-S4) of the discharging current of the auxiliary capacitor (C1). Therefore, the discharging speed of the auxiliary capacitor (C1) is increased and the discharging time of the auxiliary capacitor (C1) is shortened.

Description

technical field [0001] The present invention relates to a power supply device having an inverter circuit and a power supply device for arc machining. Background technique [0002] A power supply device used in an arc machining machine, etc., as disclosed in Patent Document 1, for example, includes a DC conversion circuit for converting a commercial power supply (three-phase AC power supply) rectified by a rectification circuit to a DC smoothed by a smoothing capacitor. voltage; and an inverter circuit constituted by a full bridge circuit of switching elements. The inverter circuit converts the DC voltage from the DC conversion circuit into a predetermined high-frequency AC voltage by controlling each switching element to be turned on and off alternately for each group. Thereafter, the predetermined high-frequency AC voltage from the inverter circuit is further converted into a DC voltage for arc machining suitable for arc machining such as arc welding or arc cutting. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/42H02M7/48H02M1/38B23K9/10
Inventor 卫藤哲弥森本庆树土井敏光真锅阳彦
Owner DAIHEN CORP