PWM Controller Current Emulator Transient Response

The controller is segmented into functionally independent modules: current detector module (with first, second, and third transistors), current emulator module (with fourth and fifth transistors), voltage-to-current converter module (with sixth and seventh transistors), and current adder module (with output transistor). Each module handles a specific aspect of current detection and processing, enabling parallel operation that reduces transient response time while maintaining manageable complexity through modular design.

The current emulator proactively generates an estimated lower-gate current (fourth current) based on previously detected currents and voltage differences before the actual lower-gate current is fully established. This preliminary action provides advance current information to the current adder, reducing the overall transient response time of the controller.

The current detector continuously monitors the first current flowing through the first transistor and feeds this information to the current emulator. The emulator uses this feedback along with voltage difference information from the voltage-to-current converter to dynamically adjust the fourth current estimate, ensuring accurate current information delivery that reduces output distortion and improves linearity.

The current emulator acts as an intermediary between the current detector and the current adder. It processes the detected first current and voltage difference information to generate the fourth current, which compensates for the lack of direct lower-gate current information. This intermediary processing ensures accurate current summation and reduces output distortion.