Study of hybrid active control strategies for the Bus-Pumping cancellation in the Half-Bridge Class-D audio power amplifiers

The Active Control is presented as an effective method for compensate the amplitude distortions in D-Class Half-Bridge amplifiers. Distortions due to DC-Bus Pumping that appear such as an attenuation static gain of the amplifier are reduced by the new control proposed. This paper presents three different methods to estimate the perturbation. To analyze and compare these methods, four effectiveness new parameters has been presented. Simulation results conclude that Hybrid Current Estimator presents best performance and effectiveness than Hybrid Voltage Estimator and Hybrid Sensorless Estimator to Active Control Compensation.