Linearization of the Dynamic Model of a Full-Bridge Pulsed Converter Circuit with Bidirectional Differential PWM
DOI:
https://doi.org/10.24160/0013-5380-2026-1-58-72Keywords:
pulsed converter, bridge circuit, differential PWM, two-channel nonlinear control, dynamic model linearization, higher harmonicsAbstract
The article considers the bridge circuit of a reversible pulsed DC voltage converter (DCVC) with differential pulse width modulation (DPWM), which is widely used as class D power amplifiers in forced oscillation and self-oscillation modes. Pulsed DCVCs with DPWM feature simplicity and accuracy of obtaining small average values of the output voltage. To implement DPWM in the bridge power circuit, a two-channel control system with a relay element in each channel is used. This makes it difficult to study the dynamics of pulsed DCVCs with such control system, since there is lack of a suitable accurate dynamic model in view of the presence of two relay nonlinearities. An accurate linearized dynamic circuit DCVC model consisting of four parallel connected ideal impulse elements is substantiated. It is shown how the developed discrete linearized dynamic model can be used to accurately account for the second harmonic component of the sought variable, which penetrates into the input of the circuit under consideration from the power circuit output via a feedback circuit. The adequacy of the developed linearized dynamic model has been verified by accurate calculations.
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