Founded in 1967, Hisen Enterprises Co Ltd is a manufacturer of transistor generators for pipe welding and heat treatment and high frequency machines. A new transistor generator has been developed using Hisen's latest technology that incorporates new-type transistor devices. According to the company, it has drastically reduced the size of conventional transistor generators and caters to the diversified applications of tube welding and heat treating industries. The features of this new generator include -a frequency range of 500Hz to 440kHz at an output range of 2-1,000kW, a power factor of 0.95, and power conversion of 90 per cent efficiency. In cases of short time heating, it provides increased output power to solve problems. Because transistors are used instead of vacuum tubes, the level of input power can be reduced by over 22 per cent and cooling water can be saved by up to 50 per cent.
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