The input current of the parallel intermediate frequency furnace is constant, the output voltage is approximately sine wave, the output current is rectangular wave, the commutation is carried out before the voltage crosses zero on the resonant capacitor, and the load current is always ahead of the voltage one φ Angle.
并联中频炉的输入电流恒定，输出电压近似正弦波，输出电流为矩形波，换流是在谐振电容器上电压过零以前进行，负载电流也总是越前于电压一φ角。
That is to say, the working state of both is the capacitive load state.
也就是说两者的工作状态都是容性负载状态。
2, the load circuit state is different
2、负载电路状态不同
(1) The load circuit of the series intermediate frequency furnace presents a low impedance to the power supply, which is required to be powered by a voltage source, and the DC power supply end needs to be rectified and filtered, and must be connected with a high-power filter capacitor.
（1）串联中频炉的负载电路对电源呈现低阻抗，要求由电压源供电，需要经整流和滤波的直流电源末端，必须并接大功率的滤波电容器。
When the inverter fails, the surge current is large and the protection is difficult.
当逆变失败时，浪涌电流大，保护困难。
(2) The load circuit of the parallel intermediate frequency furnace presents a high impedance to the power supply, which is required to be powered by the current source, and a large inductor needs to be connected in series at the end of the DC power supply, but when the inverter fails, the impact is not large and easy to protect because the current is limited by large reactance.
（2）并联中频炉的负载电路对电源呈现高阻抗，要求由电流源供电，需要在直流电源末端串接大电感器，但在逆变失败时，由于电流受大电抗限制，冲击不大，容易保护。
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