The JK3S series three-phase thyristor trigger board is a new type of power control device with high digitalization. It integrates three triggering modes: phase displacement voltage regulation, variable period zero-crossing power regulation, and fixed period zero-crossing power regulation. It can be freely switched between these three modes using an external conversion switch. The trigger board features a digital display module that can real-time display input signals, load power, load voltage, load current, and more. It offers functions such as slope adjustment, soft start, soft turn-off, current limitation, overcurrent protection, voltage limitation, overvoltage protection alarm, and has four adjustment modes: open-loop voltage regulation, closed-loop constant current, closed-loop constant voltage, and closed-loop constant power.