APF in Crystal Growth Furnace

Sapphire substrates used in the production Sapphire Dan Changjing furnaces power three-phase full-controlled bridge rectifier circuit the AC to DC rectifier , smoothing through the reactor after a constant DC current source , and then the single-phase inverter bridge , the DC current is inverted into a single phase of about 7KHz frequency current. Load from the induction coil and the compensation capacitor , which connects to the parallel resonant circuit is inductive furnace .

In the production process of crystal growth furnace to produce large harmonic current , harmonic mainly 2,4,5,7,8 , wherein about 70% of the second harmonic . Adjusting the power system current RMS and harmonic content will be a corresponding change: when working in a small load , depending on the current of 60A, current harmonic distortion rate of 110% ; in the large work load , depending on the current of 150A and current harmonic distortion rate of 76%. In the course of crystal growth furnace will produce about 60A ~ 120A current harmonics .


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