Open-loop Control Method In Ac Power Regulators

industrial power conditioner is responsible for voltage regulation and power control in power electronic equipment. Different control methods correspond to different system architectures based on the design of the control structure. Open-loop control electrical power conditioner is a relatively basic type of regulation method. Its control logic is centered on preset parameters, and output voltage changes are achieved by adjusting trigger signals or the conduction state of switching devices. In industrial power systems, this type of control is commonly found in relatively simple voltage regulating devices.

Open-loop control structure principle

The control system of the single phase power conditioner device with open-loop control does not include a feedback detection link. The control unit directly drives power devices, such as thyristors or IGBTs, according to preset control signals, adjusting the AC output voltage amplitude by changing the conduction angle or switching duty cycle. A direct relationship is formed between the output voltage change and the control signal; the system operation does not depend on real-time feedback signals at the output.

In power electronic voltage regulating circuits, the on/off state of the power devices determines the voltage waveform change. By controlling the on-time ratio, the output voltage can be adjusted within a certain range.

Control Characteristics in AC Power Regulators

In an open-loop configuration, the control link of the 444 is relatively simple, mainly consisting of a trigger control circuit, a power regulation unit, and an AC input terminal. The trigger circuit generates control pulses based on a set signal. Upon receiving the trigger signal, the power devices change their conduction phase, thereby regulating the output voltage waveform.

This structure emphasizes the direct relationship between the control signal and the power circuit. System parameters are typically set during the design phase, and operation mainly depends on stable grid conditions and load status. The control process revolves around techniques such as conduction angle adjustment, switching cycle control, and AC waveform modulation, forming a relatively typical control architecture in basic power regulation equipment.