SU1579678A1 - Power supply source for welding - Google Patents

Abstract

The invention relates to welding, specifically to welding power sources with output parameters controlled according to a predetermined law. The purpose of the invention is to improve the quality of the welded joint by forming the required external characteristic of the power source. The device consists of a power converter, an output parameter sensor, a control signal driver, and a feedback channel. In the device, the control signal to the power converter comes from the driver of the control signal at the command of the comparator. This happens when the signal from the device reaches the functional level of the reference signal generator. The information on the shaper comes from a device for obtaining information about the current integral value of the output parameter. The information on the current integral value of the output parameter is converted into information on the duration of the current clock according to the functional dependence and, by changing the duration of the current conversion clock, before adjusting it to the reference signal, adjust the average current and voltage at the output. 1 il.

Description

The invention relates to welding, more specifically to welding power sources with output parameters that are controlled according to a given law.

The purpose of the invention is to improve the quality of the welded joint by forming the required external characteristic of the power source.

The drawing shows a functional block diagram of a power source with output control.

The welding power source contains a power converter 1, an output parameter sensor 2, a device 3 for receiving information about the current integral value of the output parameter, a device 4 for converting information about the current integral value of the output parameter into information about the duration

the current energy conversion cycle, the comparator 5, the driver 6 of the control signal, the synchronization device 7, the device 8 for generating the reference signal. Devices 3-6 are interconnected in series. The input device 3 is connected to the output of the sensor 2, which is connected to the welding aepi. The output of the driver 6 is connected to the input of the power converter 1. The outputs of the synchronization device 7 are connected to the synchronization inputs of devices 3 and 8. The output of the device 8 is connected to the input of the comparator 5. The power converter 1 is connected to the industrial network and the output to the welding circuit.

The power source works as follows.

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The voltage of the industrial network is supplied to the input of the power converter 1. After a time equal to the duration of the conversion cycle at the go, if the output current information is used, or during a short circuit, if the output voltage information is used, a control signal is supplied to the control input power converter 1, since the output of sensor 2 and device 3 to this was information corresponding to the zero value of the output parameter.

With the arrival of the control signal at the control input of the power converter I, the first conversion cycle begins and the output voltage of the power supply source appears in the welding circuit, and when the load resistance is less than infinity, a current begins to flow. At the moment the control signal is supplied to the synchronization inputs of the device 3 and the reference signal generating device 8, a clock pulse is output from the output of the synchronization device 7. The sensor 2 of the output parameter continuously records and outputs the information about the output parameter value in real time to the input of the device 3. From the beginning of the next clock cycle, this information is continuously integrated, and its current integral value is fed to the input of the functional conversion device 4, from the output of which the information transformed by the functional dependence is fed to one of the inputs of the comparator 5. Thus, at the inputs of the comparator 5, from the beginning of the clock, at the same time, the information on the duration of the current conversion cycle at a given time is expressed as an electrical signal, which is functionally connected to deformations of the current integral value of the output parameter, as well as information about the magnitude of the time interval from the start of the current cycle up to this point. When two electric signals coincide at the inputs of the comparator 5 in magnitude, the last one outputs to the input of the control signal generator 6 a command to end the current conversion cycle and start the next one. The driver 6 of the control signal generates a pulse signal at the output to control the power converter 1. In the next cycle, the process is repeated.

The device 3 receiving information about the current integral value of the output

The parameter is a high-speed integrated amplifier with a timed reset of information. The functional conversion device 4 can be made on the basis of a functional converter with a piecewise linear approximation of non-linear characteristics. As a reference signal generating device 8, a sawtooth generator can be used.

As a driver 6 of the control signal and the synchronization device 7, for example, waiting one-shot vibrators with corresponding characteristics can be used.

In comparison with the known, the proposed power source contributes to an increase in the quality of the welded joint, which is achieved by the possibility of forming the required external characteristic. This makes it possible to reduce the spatter of the electrode metal, to reduce the number of defects in the welded joint.

Claims (1)

Invention Formula A welding power source containing a power converter connected to an industrial network, and an output to a welding circuit in which the output parameter sensor is connected, a device for obtaining information about the current integral value of the output parameter whose input is connected to the output parameter sensor, a comparator, driver control signal, a synchronization device and a device for generating a reference signal, the output of the latter being connected to the first input of the comparator, the output of the comparator is connected input of a control signal, which output is connected to a control input of the power converter, outputs a synchronization device connected to the input of the reference signal and the device for producing the current integral value of the output parameter, characterized in that, in order to increase the quality of welded joint by forming the required external characteristic of the power source, it is equipped with a device for functional information conversion, the input of which is connected to the output of the device for receiving information about the current integral value of the output parameter, and the output to the second input of the comparator. Network Have i four sT