Abstract:
Based on the mathematical model of flyback
switching DC-DC converter in the continuous current mode
and the simulation model under heavy loads, this paper
presents a study of the steady-state power loss in the output
diode, including the loss calculation models under three
operational modes (voltage control, under-voltage, and overcurrent
modes), the relations of the diode loss versus the
input and output voltages, and a comparison of the losses
under different modes. By the heavy load simulation model,
the effects of time delay on the diode loss are also
investigated. Finally, the proposed models are applied to
calculate the power losses of output diode of an existing
flyback switching DC-DC converter.
