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Inverter control device and inverter control method

A converter control and transformer technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, manufacturing tools, etc., can solve the problems of transformer saturation, switching elements cannot be fully driven, and difficult high-precision micro-current Control and other issues to achieve the effect of controlling the output current

Active Publication Date: 2011-10-26
PANASONIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the case of a TIG welding machine where the output current needs to be stably controlled by a few amperes, the above situation will become a problem.
[0059] This phenomenon also has the following problems: near the minimum drive width, the gate drive power of the switching element is insufficient, so that the switching element cannot be driven sufficiently, and the transformer is saturated due to heat generation of the element and instability of the transformer current.
[0063] As mentioned above, there are following problems: in the phase control method, it is difficult to suppress the heat generation of the equipment due to the large regenerative current, and on the other hand, in the PWM control method, it is difficult to control the small current with high precision

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0109] use figure 1 and Figure 2A -C describes the arc welding machine using the inverter control device according to the first embodiment. figure 1 The schematic structure of the main part of the arc welding machine in this Embodiment 1 is shown. Figure 2A -C is a schematic diagram which shows the operation|movement of the structural part of the arc welding machine of this Embodiment 1. Figure 2A ~C are diagrams for explaining the operation of the arc welding machine, each showing the case where the welding output is small ( Figure 2A ), in the case of the output ( Figure 2B ) and in the case of large output ( Figure 2C ), the action of the switching element, the conduction period of the converter and the primary current waveform of the transformer.

[0110] In addition, the distinction among the small output, the middle output, and the large output among welding outputs is performed based on the magnitude|size of the error amplification signal from the error amp...

Embodiment approach 2

[0143] use image 3 and Figure 4A -C demonstrates the arc welding machine which employs the inverter control apparatus of this Embodiment 2. FIG. image 3The schematic structure of the main part of the inverter control apparatus of the arc welding machine in this Embodiment 2 is shown. Figure 4A to C are used to describe the operation of the inverter control device of the arc welding machine according to the second embodiment. Indicates: when the welding output is a small output ( Figure 4A ), in the case of the output ( Figure 4B ) and in the case of large output ( Figure 4C ) In the converter control device, the action of the switching element, the converter conduction period, and the transformer primary current waveform.

[0144] In addition, in this embodiment, the same structure and the same part as Embodiment 1 are attached|subjected by the same code|symbol, and detailed description is abbreviate|omitted.

[0145] The main difference from the first embodiment ...

Embodiment approach 3

[0178] use Figure 5 The inverter control device of the arc welding machine according to Embodiment 3 will be described through FIG. 7 . Figure 5 The schematic structure of the main part of the inverter control apparatus of the arc welding machine in this Embodiment 3 is shown. Figure 6A -C is a schematic diagram for demonstrating the operation|movement of the inverter control apparatus of the arc welding machine of this embodiment. Respectively represent the case where the welding output is a small output ( Figure 6A ), in the case of the output ( Figure 6B ) and in the case of large output ( Figure 6C ), the action of the switching element, the conduction period of the converter and the primary current waveform of the transformer. Figure 7A , B is an explanatory diagram of the operation of the converter, showing changes in the operating state. Figure 7A Represents the entire waveform of 1 cycle, and Figure 7B shows Figure 7A The conduction state of the switchin...

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Abstract

Disclosed are an inverter control device and an inverter control method, wherein a switching circuit on one side is driven with a fixed conduction width and a switching circuit on the other side is switched to a pulse width modulation system, a phase control system, or a drive signal width control system using the phase control system according to the output state, thereby implementing high accurate control at the time of small output while suppressing the heat generation of switching elements.

Description

technical field [0001] The present invention relates to an inverter control device and an inverter control method, and more particularly to a control device and a control method for an inverter circuit for welding output control used in a welding machine that generates an arc to process an object to be processed. Background technique [0002] Generally, a device that generates an arc between an electrode of a welding machine and an object to be processed (hereinafter referred to as a base material) to melt the base material and then processes it is equipped with a power control circuit for controlling the contact between the electrode and the base material. The output current flowing between the materials and the output voltage applied between the electrode and the base material. [0003] In recent years, in order to cope with the high performance and miniaturization of equipment, this power control circuit is generally composed of an inverter circuit using high-speed switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387B23K9/073
CPCB23K9/067B23K9/073B23K9/09B23K9/1043B23K9/167B23K9/173H02M7/53871H02M1/0048Y02B70/10Y02P70/10
Inventor 大崎宪和田中义朗田畑芳行
Owner PANASONIC CORP
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