JPH0371225B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a DC power supply device for arc welding for setting welding current and welding voltage using digital signals 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 from an external digital device, as shown in FIG. The calculation results of the circuit 2 are converted into analog signals by digital/analog conversion circuits 3 and 4 and sent to a 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, and redundant digital/analog converters including other digital devices are required. , required an analog/digital converter. Furthermore, as a result of cumulative conversion errors of these converters, it has been difficult to accurately control welding output. Furthermore, if the arithmetic circuit 7 in the arc welding DC power supply main body 5 is an analog type, the correlation between the analog setting input and welding output between different welding power supplies is different, and as a result, the external digital device 1 It was necessary to change the converter characteristics of the digital/analog conversion circuits 3 and 4 each time the power source used was different, or to change the software program if the external digital device 1 used a microcomputer. In addition, in Figure 1,
8 is an output control circuit, 9 is a welding current control element, 10
is a welding voltage control element. OBJECT OF THE INVENTION The present invention solves these conventional drawbacks, and provides digital settings for welding current and voltage values from other related digital equipment to a DC power source for arc welding using a simple circuit configuration. The purpose is to Composition of the Invention In order to achieve this object, the present invention includes a setting signal input circuit for setting a welding output, an arithmetic circuit for calculating the setting signal, and a welding voltage control element or a welding current that outputs the arithmetic result of the arithmetic circuit. and an output control circuit that controls the control element, and the setting signal input circuit multiplies the input welding current setting value by 1/2, converts it into a binary number, and calculates the welding current value. a current binary number processing unit that outputs to the circuit;
It consists of a voltage binary number processor that multiplies the input welding voltage set value by 10, then 1/2, converts it into a binary number, and outputs this welding voltage value to the arithmetic circuit. be. DESCRIPTION OF EMBODIMENTS The content of the present invention will be described below with reference to the drawings of FIGS. 2 to 4. FIG. 2 shows the configuration of the DC power supply device for arc welding according to the present invention, and the set values of welding current and voltage that are directly transmitted as digital signals from the arithmetic circuit 12 of other related digital equipment 11 are used for arc welding. The signal is input to the setting signal input circuit 14 in the DC power supply main body 13. Of these, regarding the setting of the welding current, a part of the setting signal input circuit 14 is configured.
The current binary number processor 14a converts the current setting input from the arithmetic circuit 12 of the other related digital equipment 11 back into a decimal number, doubles it and inversely converts it, and then converts the current setting input from the arithmetic circuit 12 of the other related digital equipment 11 back to the decimal number, and converts the current setting input into a decimal number by doubling the value. A signal is output to 15. Similarly, regarding the setting of the welding voltage, the voltage binary number processing unit 14b converts the voltage setting input from the arithmetic circuit 12 of the other related digital equipment 11 into 10
The calculation circuit 1 converts it back to a decimal number, doubles it, and then converts it back to 1/10 to obtain the welding voltage value of this value.
A signal is output to 5. The calculation circuit 15 performs various calculations so that the welding current value and welding voltage value set by the two signals sent from these setting input signal circuits are obtained. Specifically, since these signal processing methods are well known, their explanation will be omitted, but the welding current value is detected and compared with the signal from the current binary processing section 14a to determine a predetermined welding current value. It is also conceivable to output the calculation result to an output control circuit 16 such as a drive circuit for a wire feeding motor, thereby forming a feedback loop regarding the welding current and driving the welding current control element 17. Similarly, the input power supply voltage value is detected and compared with the signal from the voltage binary number processing section 14b, and a signal is output to the output control circuit 16 that drives the welding voltage control element 18 so that a predetermined welding voltage is achieved. Tables 1 and 2 are examples of the format of the setting digital signal to be input to the setting signal input circuit 14 in FIG. 2 when setting the current and voltage values. According to Table 1, the current value setting range is 0 to 510A, and the current value resolution is 2A, while according to Table 2, the voltage value setting range is 0 to 51.0V, and the voltage value resolution is 0.2V. These values are sufficient for the control range and resolution of a normal DC power source for arc welding.

【table】

【table】

[Table] In the embodiment shown in FIG. 3, the welding current setting signal and welding voltage setting signal are each communicated using seven digital signals. According to this example, the welding current is 0 to 508A with a resolution of 4A, and the welding voltage is 0 to 50.8V with a resolution of 0.4V. Furthermore, in the embodiment shown in FIG.
Synchronous signals STB1 and STB2 are provided to transfer data from other equipment to the welding power source, and the system reads the transferred data at 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 uses welding current and welding voltage setting signals sent from other related digital equipment. is taken into the setting signal input circuit 14. Here, each setting signal is ROM (Read
Only Memory) etc. may be converted into functions. The output signal of the setting signal input circuit 14 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 as follows.
In the case of Figure 1, the output of other related equipment must be adjusted for each type of welding power source, whereas in the case of Figure 4, the output of the welding power source and other related digital equipment must be adjusted. The point is that the format of the signal is unified. That is, even if the welding power sources have different input-output characteristics, the combination of digital signals input to the welding power sources remains the first and second combinations. 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 of a welding power source and other related digital equipment without providing redundant converters. Furthermore, by unifying the signal format, it is possible to provide the market with a system that is compatible with equipment even if the types and characteristics of welding power sources are different.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional DC power supply device for arc welding, FIG. 2 is a block diagram showing the configuration of a DC power supply device for arc welding according to the present invention, and FIGS. 3 and 4 respectively show an embodiment of the present invention. FIG. 2 is a block diagram of a DC power supply device for arc welding according to an example. 11...Other related digital equipment, 12...Arithmetic circuit, 13...DC power supply for arc welding, 14...
...Setting signal input circuit, 14a... Current binary number processing unit, 14b... Voltage binary number processing unit, 15... Arithmetic circuit, 16... Output control circuit, 17... Welding current control element, 18... Welding voltage control element.

Claims (1)

[Claims] 1 Consists of a setting signal input circuit for setting the welding output, an arithmetic circuit for calculating the setting signal, and an output control circuit for outputting the calculation result of this arithmetic circuit and controlling the welding voltage control element or the welding current control element,
The setting signal input circuit includes a current binary processing unit that multiplies the input welding current setting value by 1/2, converts it into a binary number, and outputs the welding current value to the arithmetic circuit; Arc welding characterized by comprising a voltage binary number processing unit that multiplies the set voltage value by 10, multiplies it by 1/2, converts it into a binary number, and outputs this welding voltage value to an arithmetic circuit. DC power supply for use.