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The power regulator is a unit that uses a thyristor (also known as a SCR) and its trigger control circuit to adjust the load power. Nowadays, more digital circuits are used to trigger SCRs to realize voltage regulation and power regulation, and voltmeters and ammeters can be added, and the voltage and current display is intuitive. The phase-shifting control method is adopted for voltage regulation, and there are two ways of power regulation: fixed-period power regulation and variable-period power regulation, and the voltage and current of power regulation cannot be measured.

1. According to the load characteristics, there are inductive load power regulators and resistive load power regulators

2. Divided according to the SCR's intervention in the main circuit, there are single-phase, dual live-wire two-phase, three-phase two-control power regulator and three-phase full-control power regulator;

3. According to the on-off output mode of the main circuit of the power regulator, there are three modes of fixed-period, variable-period and time-sharing control.

4. The high-end power regulator has added current and voltage protection, full digital display, and all parameters can be set according to customer requirements.

The fixed cycle is generally used for loads connected in the three-wire system (no neutral wire).

The variable period is beneficial to reduce the low-frequency impact of on-off current in some cases, and is suitable for three-phase four-wire loads.

Time-sharing control has the advantage of better dispersing the total current when multiple power regulators are running on the same network.

5. The control mode can be selected according to the load mode: transformers and molybdenum rod loads use thyristor voltage regulators, rheostatic loads use power and voltage regulation integrated control methods, low temperature uses voltage regulation control methods, and high temperature uses zero-crossing control methods; All control methods can be used for resistive loads, 4-20MA is the most commonly used, there are also 0-5V, 0-10V, and 10K potentiometers can also be adjusted manually, but in terms of energy saving, it is best to use zero-crossing power adjustment control methods.