Efficiency of electronic products improved
June 24, 2025The electronic technical products institute of the electronic industry management bureau under the Ministry of IT Industry developed a semiconductor DC arc welder.
The welder is not only convenient to handle but also consumes less electricity while ensuring welding quality on a high level.
In the course of the research with the focus given to manufacturing the high frequency transformer, an essential part of the semiconductor DC arc welder, researchers completed the technology of making transformer with the current-stable filtering function and the voltage and current-stable function in a Korean way. As a result, they made the welder whose performance is superior to that of another country in composition and characteristics.
The inverse transformation control, welding outlet sensing and operation, conversion to cut-off and display and protection functions of the welding machine are performed by using one-chip microprocessor, thus ensuring the stability of operation.
The welder is superior to the AC welder in terms of the quality of welding, as it ensures 90 percent of welding efficiency while saving 20 percent of electricity. In particular, it ensures high current stability characteristic which is difficult to realize in common DC welders and the electric arc is very stable and the sputtering rate is low for the unique structure where auxiliary coils are installed in the high-frequency transformer. It was highly appreciated at the DPRK-Russia IT Products Exhibition-2024 held last year.
The institute also unveiled a frequency converter for controlling electric motors with high practicality. A circuit design and a control program for the normal operation of electric motor were developed for the converter and the protection system of electric motor and operator control panel was built up. As a result, several knotty points which had occurred during the operation of electric motors could be settled.
The voltage frequency regulator developed by the institute helps prevent trouble in equipment caused by variations in input voltage and frequency.
The institute is now concentrating efforts on further improving the technical characteristics of the semiconductor DC welder and laying the foundation for the mass-production of the new product by manufacturing a welder card testing device and comprehensive test stand.
THE PYONGYANG TIMES