Medium and high frequency transformer

Abstract

The invention relates to a water-cooled middle-high-frequency transformer for a resistance welding machine. The invention provides the middle-high-frequency transformer, wherein a main transformer comprises a magnetic core, a primary winding and a secondary winding; the middle part of the primary winding is provided with three to eleven groups of primary coils, each group of primary coils is formed by connecting two coils in series, which have the same number of turns and are wound in the forward and reverse directions, and each group of primary coils is provided with two lead-out terminals; two ends of the primary winding are respectively provided with a group of primary small coils, the two groups of primary small coils are connected in series, the two groups of primary small coils are provided with two lead-out terminals; dotted terminals in all the lead-out terminals in the primary winding are connected mutually, namely the dotted terminals are connected in parallel to form two input terminals of the main transformer; the secondary winding comprises one to five groups of secondary coils and centre taps led out from the secondary coils, dotted terminals in two lead-out terminals of all the secondary coils are connected in parallel to form two lead-out terminals, the two lead-out terminals are respectively connected with diodes and are then combined to form a first output terminal of the main transformer, and the centre taps are used as a second output terminal of the main transformer.

Description

technical field [0001] The invention belongs to the field of welding equipment accessories, in particular to a medium-high frequency transformer, in particular to a medium-high frequency transformer using a water-cooled resistance welding machine. Background technique [0002] Commonly used resistance welding machine power transformers mainly work in AC power frequency and output power frequency AC or DC power frequency. Power frequency refers to the frequency of AC power used in industry, and the unit is Hertz (Hz). The iron core is mainly made of silicon steel sheet, which is bulky and heavy. Since the output current is controlled by the conduction angle of the thyristor, its dynamic performance is poor, the control accuracy is not high, and the conversion efficiency of the transformer with low frequency is low. Low, the volume of the transformer needs to be large, and the efficiency of the transformer is high if the frequency is high, and its transformer can be small. ...

AI Technical Summary

Problems solved by technology

[0004] The traditional intermediate frequency transformer has the following disadvantages: it is difficult to work at a frequency above 5000HZ. With the increase of frequency and output power, the temperature rise of the transformer is very high, the output current becomes smaller, and the rectifier diode is easily damaged.

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