JP3181346B2 - Arc welding power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding power supply used for arc welding.

[0002]

2. Description of the Related Art A conventional arc welding power supply device is provided with a meter for displaying an output current value and an output voltage value. When the arc welding operation is completed, the display of the meter indicates the value at the time of arc welding completion. Is displayed.

[0003] Therefore, a welding operator attaches a measuring instrument for recording an output value from time to time to an arc welding power supply device, and confirms the output value of the performed arc welding from the recording of the measuring instrument after the welding operation.

[0004]

In the conventional arc welding power supply device, the output current value and the voltage value are displayed by an analog meter or the like only during the welding output period. It is often difficult to view the meters of the welding power source at the same time, and it is very difficult for an unskilled person to set the output value because the relationship between the output arc state and the current and voltage cannot be accurately known.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an arc welding power supply device capable of knowing the relationship between an output arc state and current and voltage after welding output without using a measuring instrument for recording an output value during welding. And

[0006]

According to the present invention, there is provided an arc welding power supply apparatus comprising: a current detector for detecting a welding output current; a voltage detector for detecting a welding output voltage; and a current value output from the current detector. A signal and a voltage value signal output from the voltage detection unit are input, and a welding output current value and a voltage value are averaged in real time from the start to the end of the welding output start signal to calculate a current average value signal and a voltage. An operation for outputting an average value signal and outputting an output current value and a voltage average value as a current average value signal and a voltage average value signal at a preset time from the end of the welding output start signal to a predetermined time (T1). A driving unit for inputting the current average value signal and the voltage average value signal, converting the signal into a signal for external display, and outputting the signal; and a driving signal from the display driving unit, the welding current average value and the welding voltage level. It provided a display device unit for displaying the values,
The predetermined time in the arithmetic unit is set to a specified time (T0) after the welding output is performed by the welding output start signal.
The arithmetic device unit sets the predetermined time (T0) after the end of the welding output start signal until a predetermined time (T1).
The current average value signal per unit time at that time ,
The voltage average value signal is configured to be output and held.

[0007]

According to this configuration, the arithmetic unit averages the current value and the voltage value at the time of welding output, and outputs the average value for a predetermined time after the welding is completed. From the output average value, the arc state of the performed welding can be confirmed, the welding output can be easily set, the work efficiency is improved, and the output value can be managed, thereby improving the welding quality.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The arc welding power supply device of the present invention is configured as shown in FIG. 1 is a current detector, 2 is a voltage detector, 3 is an arithmetic unit, 4 is a display driver, 5 is a display element, 6 is a main output circuit, 7 is a shunt, and 8a and 8b are output terminals. .

The current detecting section 1 detects a welding current value currently output by using a shunt 7 placed between the main output circuit section 6 and the output terminal 8b, performs A / D conversion, and performs a current value. Output as signal Ia.

The voltage detector 2 detects a voltage value between the output terminals 8a and 8b, performs A / D conversion, and performs a voltage value signal V
Output as a. The arithmetic unit 3 performs an averaging process on the current value signal Ia and the voltage value signal Va while receiving the activation signal TS, and averages the current value Ia.
ave ”and a voltage average value signal“ Va ”obtained by averaging Va.
ve "is output in real time.
The average value per unit time is calculated using a microprocessor or the like. The start signal TS is turned off and the current value signal I
During a period from the time when the value of a becomes zero to a preset time T1, the current average value signal “Iav” after a predetermined time TO after the welding output is performed by the start signal TS.
e "and the voltage average value signal" Vave "are output and held. The times TO and T1 can be freely set and changed on a program. These can be easily realized using a microprocessor or the like.

The display driver 4 outputs a current average value signal “Iav
e "and the voltage average value signal" Vave ", and outputs a drive signal SD for displaying a current value and a voltage value.
Displays a current value and a voltage value in response to the drive signal SD, and can be easily realized by using a segment light emitting diode display, a liquid crystal display, or the like.

FIGS. 2A to 2C show display time charts. The display of the current value will be described as an example. The welding output is started when the start signal TS is turned on, and at the same time, the average current value is displayed on the display element. The output current value is displayed on the display element section 5 in real time as long as the activation signal TS is in the ON state. At this time, every time TO time elapses from the time when the start signal TS is turned on, the current average value “I”
aveO "is stored while being repeatedly updated by the arithmetic unit 3. The welding output is stopped when the start signal TS is turned off, and the stored current average value" IaveO "is displayed until the predetermined time T1. The output value is displayed on the section 5 and the output value can be easily known even after the welding output is completed.

The arithmetic unit 3 is configured as shown in FIG. 31 is an arithmetic processing unit, 32 is a storage unit, 33 is a clock counter unit, 34a and 34b are analog / digital conversion units, 35 is a TO time setting unit, and 36 is a T1 time setting unit.

The arithmetic processing section 31 accumulatively adds each of the current value signal Ia and the voltage value signal Va a fixed number of times, divides the sum by the number of times to obtain an average value, and determines whether the activation signal TS is in the ON state. If the current value signal Ia is not zero, the average value is output as it is as the current average value signal “Iave” and the voltage average value signal “Vave”. The values set by the TO time setter 35 and the T1 time setter 36 are digitally converted via analog / digital converters 34a and 34b, and are read into the arithmetic processing unit 31 as the TO set time and the T1 set time. When the start signal TS is turned on, the clock counter unit 33 starts counting, and stores the current average value and the voltage average value when the TO value matches the count value in the storage unit 32. When the activation signal TS is turned off, the clock counter 33 starts counting. When the activation signal TS is turned off and the current value signal Ia becomes zero, the current average value and the voltage average value stored in the storage unit 32 are updated. The current average value signal “Iave” and the voltage average value signal “Vave” are T1
Output until the value matches the count value.

The arithmetic processing unit 31 is a microprocessor, the storage unit 32 is a volatile memory device, and the clock counter unit 3
3 is a counter integrated circuit, an analog / digital conversion unit 34
a and 34b are A / D conversion integrated circuits, TO time setting unit 35
The T1 time setting device 36 can be easily realized by a variable resistor or the like.

[0016]

As described above, according to the present invention, a current detecting section for detecting a welding output current, a voltage detecting section for detecting a welding output voltage, a current value signal output from the current detecting section and the voltage With the voltage value signal output from the detection unit as an input, the welding output current value and the voltage value are averaged in real time from the start to the end of the welding output start signal, and the current average value signal and the voltage average value signal are calculated. An arithmetic unit for outputting and outputting an output current value and a voltage average value as a current average value signal and a voltage average value signal at a preset time from the end of the welding output start signal to a predetermined time (T1); A display drive unit that receives the current average value signal and the voltage average value signal, converts the signal into a signal for external display, and outputs the signal. The drive signal from the display drive unit displays the welding current average value and the welding voltage average value. table And an element unit, wherein the predetermined time in the arithmetic unit is set to a specified time (T0) after the welding output is performed by the welding output activation signal, and the arithmetic unit is configured to terminate the welding output activation signal. After a predetermined time (T
Until 1), the specified time (T0) has elapsed.
Since the current average value signal and the voltage average value signal per unit time are configured to be held, the output current value and the voltage value at any time can be displayed by the welding power source alone even after the welding output is completed. output arc condition and current, the welder a voltage relationship will be able to know, deer
The unstable welding state at the start of welding
Display after welding is completed because it is not reflected in the display after completion
Welding current average value that expresses the contents of welding work very accurately from
And the average welding voltage can be checked, even for unskilled workers.
Ru der made possible to easily output management.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an arc welding power supply device of the present invention.

FIG. 2 is a timing chart showing a display state of the device.

FIG. 3 is a block diagram showing details of an arithmetic unit of the apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Current detection part 2 Voltage detection part 3 Computation device part 4 Display drive part 5 Display element part TS drive signal

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-83779 (JP, A) JP-A-2-99282 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 9/10 B23K 9/095 G01R 19/02 H02M 9/00

Claims (1)

(57) [Claims] A current detection section for detecting a welding output current; a voltage detection section for detecting a welding output voltage; a current value signal output from the current detection section; and a voltage value signal output from the voltage detection section. From the start to the end of the welding output start signal, calculate the average of the welding output current value and voltage value in real time, output the current average value signal and the voltage average value signal, and after the welding output start signal ends From a predetermined time (T1) to a predetermined time (T1), an arithmetic unit for outputting the output current value and the voltage average value as a current average value signal and a voltage average value signal, and a current average value signal and a voltage average value signal A display drive unit for inputting the signal and converting the signal into a signal for external display and outputting the signal, and a display element unit for displaying a welding current average value and a welding voltage average value by a drive signal from the display drive unit, and an arithmetic unit Department Is set to a specified time (T0) after the welding output is performed by the welding output start signal, and the arithmetic device unit sets the predetermined time (T1) from the end of the welding output start signal to the predetermined time (T1). Means that the specified time (T0) has elapsed
An arc welding power supply device configured to hold and output the current average value signal and the voltage average value signal per unit time at that time .