Phoenix contact terminal power superposition power regulator has undergone four major technical transformations. Programmable controller can be used to make the circuit control simpler and more reliable. It can flexibly adjust and compensate the sensitivity of voltage stabilization according to different electric loads, avoiding unnecessary fluctuation compensation. The frequent fluctuation of electrical components is reduced, resulting in unnecessary fluctuation of power supply system. Thus, the service life of the equipment is effectively prolonged. All voltage regulators use the same technology to stabilize the output voltage.

输出电压通过连接到误差放大器。反相输入端的分压电阻采样，误差放大器的同相输入端连接到一个参考电压。参考电压由IC内部的带隙参考源产生。为此，它提供负载电流以保证输出电压稳定：Vout=Vref(1+R1/R2)。如果三个调压变压器的滑臂都是由一个电机来驱动的调压方式为统调稳压器，它们的工作原理同单相的稳压器一样。

The output voltage is connected to the error amplifier through. The voltage divider at the inverting input is sampled, and the in-phase input of the error amplifier is connected to a reference voltage. The reference voltage is generated by the bandgap reference source inside the IC. Therefore, it provides load current to ensure stable output voltage: Vout = VREF (1 + R1 / r2). If the sliding arms of the three voltage regulating transformers are driven by a motor, the voltage regulation mode is unified voltage regulator, and their working principle is the same as that of single-phase voltage regulator.

菲尼克斯端子电源的单相稳压连接在单相电路，输出为单相电压电路，适用于220V电器，三相稳压器应用于工业电器,其输入为380V和三相电380V，一般输出为三相三线或三相四线。三相稳压器既可以当成三相稳压器使用，也可以用作单相稳压器的使用。三相稳压器即可以为三相用电设备稳定电压，又可以为单相用电设备做为稳定电压。

The single-phase voltage regulator of phoenix contact terminal power supply is connected to the single-phase circuit, and the output is a single-phase voltage circuit, which is suitable for 220V electrical appliances. The three-phase voltage regulator is applied to industrial electrical appliances, with input of 380V and three-phase 380V, and the general output is three-phase three wire or three-phase four wire. The three-phase regulator can be used not only as a three-phase regulator, but also as a single-phase regulator. The three-phase voltage regulator can stabilize the voltage for both three-phase electrical equipment and single-phase electrical equipment.