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Welding machine

A welding machine and connecting part technology, which is applied to welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of the first rectifier part being arranged near the switching element and the like

Active Publication Date: 2009-06-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alternatively, in order to regenerate the counter electromotive force in the rectification unit, there is a constraint that the first rectification unit must be arranged in the vicinity of the switching element.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] figure 1 It is a block diagram showing the circuit configuration of the welding machine according to Embodiment 1 of the present invention. exist figure 1 Among them, a first switch circuit 31 and a second switch circuit 32 are connected in parallel between the output terminals of the first rectification unit 1 that rectifies a three-phase or single-phase AC input. The first switching circuit 31 is formed by connecting the first switching element 2 and the second switching element 4 in series. Furthermore, a connection point between the first switching element 2 and the second switching element 4 becomes a circuit output terminal 33 of the first switching circuit 31 . Furthermore, a first reverse diode 3 and a second reverse diode 5 are connected in parallel to the first switch element 2 and the second switch element 4, respectively. In addition, the second switch circuit 32 is formed by connecting the third switch element 6 and the fourth switch element 8 in serie...

Embodiment approach 2

[0049] figure 2 It is a block diagram showing the circuit configuration of the welding machine according to Embodiment 2 of the present invention. In the second embodiment, the same structures as those in the first embodiment are assigned the same symbols, and detailed descriptions thereof are omitted. exist figure 2 The difference from the first embodiment is that the first delay circuit 19 is provided inside the second drive unit 218 .

[0050] and, in figure 2 In the welding machine shown, in the case of a configuration in which the control signal S1 from the drive circuit 16 to the first drive unit 17 and the control signal S2 to the second drive unit 218 are output at the same timing, the first delay circuit 19. It is possible to delay the timing of outputting the switching signal for switching the fourth switching element 8 to the cut-off state until the specified time when the switching surge current generated by the first switching element 2 disappears, and to en...

Embodiment approach 3

[0055] image 3 It is a block diagram showing the circuit configuration of the welding machine according to Embodiment 3 of the present invention. In the third embodiment, the same structures as those in the first embodiment are assigned the same symbols, and detailed descriptions thereof are omitted. exist image 3 In this embodiment, the difference from the first embodiment is that the logic integrated circuit 20 is formed inside the drive circuit 216 .

[0056] and, in image 3 In the logic integrated circuit 20 of the driving circuit 216, a program for outputting the driving signal S1 to the first driving unit 17 and the driving signal S2 to the second driving unit 18 is stored. Thus, the output timing of the control signal S2 for switching the fourth switching element 8 to the OFF state can be delayed until a predetermined time when the switching surge current generated by the first switching element 2 disappears, and the output timing for switching the fourth switchin...

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PUM

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Abstract

An inverter circuit of a full-bridge structure comprising first through fourth switching elements; first through fourth backward diodes connected in parallel with the respective switching elements; a power transformer; a rectifying part for rectifying an output from the secondary side of the power transformer; an output detector for detecting an output from the rectifying part; an error amplifying part for amplifying the error between a signal from the output detector and an output setting signal; a first driving part for controlling the first and second switching elements; a second driving part for outputting drive signals to the third and fourth switching elements; and a driving circuit for sending ON / OFF control signals to the first and second driving parts at different timings.

Description

technical field [0001] The present invention relates to the installation of an inverter circuit in an arc generating device, especially a welding machine. Background technique [0002] In recent years, in order to realize the miniaturization and high performance of the equipment, an inverter circuit capable of high-speed switching is generally installed in the power control circuit, and welding machines controlled by the inverter are becoming popular. [0003] A conventional inverter-controlled welding machine is provided with an inverter circuit of a full-bridge or half-bridge structure using power semiconductors called IGBTs or MOSFETs. In addition, the switching elements are controlled at an inverter frequency of several kHz to 100 kHz by partial resonance control to obtain output current characteristics and output voltage characteristics. For example, such a technique is disclosed in JP-A-2004-322189. [0004] In addition, among the methods of inverter control, there i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/073H02M7/48H02M3/28
CPCB23K9/1056B23K9/073
Inventor 岛林信介永野元泰
Owner PANASONIC CORP