ORTA FREKANS DOĞRU AKIM DİRENÇ NOKTA KAYNAK SİSTEMLERİ İÇİN AKIM ÖLÇÜM DEVRESİ TASARIMI VE GERÇEKLENMESİ

Abstract

Direnç nokta kaynağı (DNK), otomotiv, beyaz eşya, mobilya ve sac işleme endüstrilerinde yaygın olarak kullanılmaktadır. Orta frekans doğru akım (OFDA) ise DNK kalitesini arttıran, yenilikçi bir yöntemdir. Bu çalışmada, OFDA-DNK sistemlerinden kaynak akım bilgisini elde edebilen bir analog integratör devre önerilmiştir. OFDA-DNK sisteminin kontrolü için ihtiyaç duyulan bu akım bilgisi, Rogowski bobininden (RB) elde edilmiştir. Kaynak transformatörünün sekonderine bağlanan RB üzerinden, kaynak akımı ile ilgili gerilim bilgisi alınmıştır. Daha sonra önerilen integratör devre yardımıyla analog sayısal dönüştürücüye veri aktarımı gerçekleştirilmiştir. Önerilen devrenin başarımı, oluşturulan OFDA-DNK sisteminde test edilmiştir. Deneysel sonuçlara göre, önerilen devrenin yaklaşık 30 kA akıma kadar gerilim dönüşümünü hatasız bir şekilde yapabildiği görülmüştür. Ayrıca, önerilen devre için, OFDA-DNK uygulamalarında analog sayısal dönüştürücüye (ASD) doğrusal akım ölçüm verisi gönderebilecek potansiyele sahip olduğu söylenebilir.

Keywords

• Orta frekans doğru akım
• Direnç nokta kaynağı
• Rogowski bobini
• İntegrator devre

Design and Implementation of a Current Measurement Circuit for Medium Frequency Direct Current Resistance Spot Welding Systems

Abstract

Resistance spot welding (RSW) is widely used in the automotive, white goods, furniture and sheet metal processing industries. Medium frequency direct current (MFDC) is an innovative method that increases the quality of RSW. In this study, an analog integrator circuit that can obtain the welding current information from MFDC-RSW systems is proposed. This current information required for the control of the OFDA-DNK system was obtained from the Rogowski coil (RB). Voltage information regarding the welding current has been obtained through the RB connected to the secondary of the welding transformer. Then, data transfer to analog-digital converter (ADC) was carried out with the help of the proposed integrator circuit. The performance of the proposed circuit has been tested in the established MFDC-RSW system. According to the experimental results, it has been seen that the proposed circuit can perform the voltage conversion up to 30 kA without error. In addition, it can also be said that the proposed circuit has the potential to send linear current measurement data to ADC in MFDC-RSW applications.

Keywords

• Medium frequency direct current
• Resistance spot welding
• Rogowski coil
• Integrator circuit

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