The ZK1000 series single-phase SCR AC regulator adopts a dual closed-loop control, the current loop is the inner loop, and the voltage loop (or power loop) is the outer loop. The stability of output voltage, current or power is high; the option of constant voltage (constant output voltage), constant current (constant output current), and constant power (constant output power) can be selected by the rotary switch; it has overcurrent, overheating and other protection functions; the input adopts linear optical coupling devices for isolation; the given parts, the regulating parts, and the thyristor circuits are electrically isolated, have strong anti-interference ability, and have high safety performance; voltage, current, and power are output (DC0～10V, three choices); it is suitable for resistive loads and inductive loads; the control board adopts advanced SMT technology, and the reliability is high.