High frequency welder power supply load shows resistance characteristic sense, which resulted in the induction welding power supply would create a lot of reactive power at the load. In order to compensate these reactive power, often couple capacitance to make inductance and capacitance at the load cancel each. Output voltage and current are in phase, circuit resonance.
When the inverter operating frequency is the same with the resonance frequency, then the efficiency of the power supply will reach the maximum. The inverter is an important part of the HF welding machine power supply.
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