1. Power adjustment
(1) It adopts the three-phase full-controlled bridge rectifier regulation. Through phase shift, the SCR trigger pulse is controlled to further control the DC voltage. According to power P = U2 / R, the power may be controlled through adjustment of the DC voltage.
(2) This power adjustment method does not affect the frequency. While the power is adjusted, the depth of heat penetration and hardened layer are not affected.
2. Rrequency adjustment mode
The equipment adopts the frequency tracking mode, that is, the operating frequency of the equipment is always close to the natural frequency of the tank circuit, which can maintain the highest efficiency and the highest power factor output. Therefore, the adjustment of the natural frequency of the tank circuit changes the operating frequency of the equipment. There are two methods to change the natural frequency of the tank circuit.
(1) Adjust the capacitance parameters. The tank capacitance is the electric capacitor. Each capacitor has 4 columns, with 1/4 capacitance for each column.
(2) Modification of inductor parameters
Inductor is actually the sensor. By change of the connection method, the inductance parameters can be changed. Such adjustment is called two-stage adjustment. It neither interferes with power adjustment not affects the frequency. The frequency adjustment also doesn't affect the power adjustment. Hence, this adjustment method is an optimal choice.
