JPS6068167A - Dc power source device for arc welding - Google Patents

Abstract

PURPOSE:To eliminate the need for a costly converter and to reduce cost by digitizing the setting of a welding current value and voltage value with simple circuit constitution. CONSTITUTION:A power source device is constituted of an input circuit 14 for a set value which sets welding output, an arithmetic circuit 12 which calculates the set signal and an output control circuit 16 which outputs the calculated result thereof and controls a control element 18 for welding voltage and a control element 17 for current. The digital signal obtd. by decreasing the set value by a factor of 1/2 then converting the same to a binary number in the case of setting the average value of the welding current value and the digital signal obtd. by increasing the set value by a factor of 10 then decreasing the same by a factor of 1/2 and converting the same to a binary number in the case of setting the average value of the welding voltage value are respectively taken into the device from the outside by the circuit 14. The signals are calculated in the circuit 12 and the results thereof are outputted to the circuit 16, by which the welding current value and the voltage value are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a DC power source for arc welding for setting a welding battery, a welding voltage using a digital signal from a remote controller, or other equipment.

Conventional configuration and its problems In a DC power supply device for arc welding, the welding current value and welding voltage value are set entirely from external digital equipment. The ticket result of the circuit 2 is converted into an analog signal by the digital/analog conversion circuits 3 and 4, and the signal is sent to the setting signal input circuit 6 in the main body 5 of the DC power supply device for arc welding. In this case, if the arithmetic circuit 7 is a digital circuit, the setting signal input circuit 6 must perform analog/digital conversion again to convert it into a digital signal. Conversion word, analog/digital converter was all needed. As a result of cumulative conversion errors of these converters, accurate welding output control was difficult.Furthermore, if the arithmetic circuit 7 of the arc welding DC power supply 1 is of analog type, different welding The correlation between analog setting input and welding output between power supplies is different.As a result, external digital superior product 1 has a digital/analog conversion circuit 3,
If the external digital device 1 is a device using a microcomputer, it was necessary to change the converter characteristics of 4 or change the software program. The welding current control element 10 is a welding voltage control element.

OBJECT OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional technology, and provides digital settings for welding current and voltage values for an arc welding DC power supply device using a completely simple circuit configuration. Structure of the invention In order to achieve this object, the present invention includes a setting signal input circuit for setting all welding outputs, an arithmetic circuit for calculating the setting signals, and a calculation result of the arithmetic circuit for all outputs. It consists of an output control circuit that controls all of the welding voltage control elements or welding current control elements, and when setting the average value of the welding current value, the set value for the entire 1h
The digital signal 1C'c is multiplied and converted into a binary number, and when setting the average value of the welding voltage value, the set value 'fr is multiplied by 10, the digital signal 1C'c is multiplied and converted into a binary number. The above operation [
The i'i-1 path is calculated and the results are output to the output control circuit to fully control the welding current and welding voltage values.

DESCRIPTION OF EMBODIMENTS The present invention will be described in detail below using the drawings of FIGS. 2 to 6.

Fig. 2 shows the configuration of the DC power supply device for arc welding according to the present invention, and the welding current and voltage settings that are directly transmitted as digital signals from the calculation circuit 12 of the other related digital machine 3g11 are for arc welding. DC power supply main body 13
The signal is input to the setting signal input circuit 14 in the internal circuit. The arithmetic circuit 15, which is made up of a microcomputer or the like, calculates and sets the entire data sent to the setting signal input circuit 14 according to its software program, and sends the data to the output control circuit 16 so as to output the fC value. . As a result, the welding current control element 17 and the welding voltage control element 18.
Tables 1 and 2 are examples of the format of the setting digital signal that should be input to the setting signal input circuit 14 in FIG. 2 when setting the current and voltage values. . According to Table 1, the setting range of the current value is 0 to 510 A1, the current value resolution is 2 people, while according to Table 2, the setting range of the voltage value is z, range (4c) to 61, OV
, the voltage value resolution is 0.2 V. These values are sufficient as the control range and resolution of the σ current power supply for normal arc welding.

The following margins (H...Halbell L...Low level) In the present invention, the welding current setting signal and welding current setting signal are communicated using seven digital signals each. According to this example, the welding current is 0 to 508A, with a resolution of 4 people, and the welding voltage is ○ to 50.8V, with a resolution of 0.4V, which is 3-! In addition, in the embodiment shown in FIG. 3, the synchronizing signals 5TB1 and 5TB2 for transferring all data from other machines to the welding power source are ignored, and the system is designed to receive all transferred data at an accurate timing.

Figure 4 shows an example applied to a so-called analog type welding power supply device that does not have a logic operation circuit such as a microcomputer inside, and the welding current and welding voltage sent from other related digital machines Hg. The setting signals are taken into the setting signal input circuit 14, where each setting signal is stored in a ROM so as to correspond to the input to output characteristics of various welding machines.
The output signal of the setting signal input circuit 14, which may be converted by a function such as (ReadOnly Memory), is converted into an analog signal by digital/analog conversion circuits 19 and 20, and reflected in the welding output. The difference between the embodiment shown in Fig. 4 and the conventional one shown in Fig. 1 is that in the case of Fig. 1, the output of other related equipment must be adjusted each time the type of welding power source differs. On the other hand, in the case of Fig. 4, the signal format between the welding power source and other related digital equipment is unified, which means that even if the welding power source has different input-output characteristics, The combinations of digital signals input to the welding power source are as shown in Table 12 and Table 2.

Effects of the Invention As described above, according to the present invention, welding current and voltage can be set at low cost as a total system including a welding power source and other related digital equipment without the need for redundant converters. By standardizing signal formats, it is possible to provide the market with systems that are compatible with equipment even if the types and characteristics of welding power sources differ.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional arc welding DC power supply device, FIG. 2 is a block diagram showing the configuration of an arc welding DC power supply device according to the present invention, and FIGS. 3 and 4 are respectively diagrams of the present invention. It is a block diagram of the DC power supply device for arc welding according to the embodiment. , 14... Setting value input "01
15... Arithmetic circuit, 16... Output control circuit, 17... Welding current control element, 18...
...Welding voltage control element.

Claims (1)

[Claims] It consists of a setting signal input circuit that sets all welding outputs, an arithmetic circuit that calculates the setting signals, and an output control circuit that outputs all the calculation results of this arithmetic circuit and controls the welding voltage control element or welding current control element. When setting the average value of the current value, the set value is multiplied by ≠ and converted into a binary number, and the set value is multiplied by 10, then the set value is multiplied by 10, and the digital signal is converted into a binary number. The DC power supply for arc welding is characterized in that the setting signal input [Il path is taken in from the outside, is calculated by the calculation circuit, and the result is output to the output control circuit to control the welding current value and welding voltage value. Device.