Abstract
In this study, we compared conventional Pulse Width Modulation (PWM) methods for Class-D amplifiers and we proposed a modified PWM pattern for high efficiency and lower common mode voltage. Bipolar PWM and Unipolar PWM methods are the main switching patterns for Class-D amplifiers. Unipolar PWM is advantageous in terms of doubling effective switching frequency, hence reducing filter size, compared to the Bipolar PWM. On the other hand, common mode performance worsens due to the asymmetrical switching pattern. In this study, we proposed a Modified Unipolar PWM pattern and we demonstrated its advantages in Class-D amplifiers for underwater acoustic applications. Throughout the paper, we presented the analytical loss calculations. The proposed pattern provides an intermediate solution in between Bipolar PWM and Unipolar PWM methods in terms of comparable efficiency and common mode performance. We demonstrated the applicability of the proposed Modified Unipolar PWM switching method and verified its performance through computer simulations and experimental test results.
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