A proportional power controller functions similarly to a standard on/off power controller. However, unlike basic controllers, proportional power controllers adjust the power delivered to the load based on the analog input signal they receive.

• Phase-angle controllers deliver proportional power to the load by turning on at specific points in the AC sine wave.

• Burst fire controllers deliver proportional power to the load by providing a series of full on/off AC cycles.

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Proportional power controllers are particularly well-suited for applications such as dimming lighting systems or maintaining precise temperature control in heating systems.