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Pulse Width Modulation technique (PWM) and Pulse Frequency Modulation technique (PFM) are commonly used techniques to generate pulses to control switches in DC-DC converters. However, these techniques generate various losses as well as output fluctuations when used at wide load ranges. The conduction losses and output voltage ripples are dominant in PWM at high loads, and switching losses are dominant...
This paper describes a combined Pulse Width Modulation (PWM)-Pulse Frequency Modulation (PFM) technique implemented in a Field Programmable Gate Array (FPGA) to control DC-DC converters. This technique changes the mode of operation from PWM to PFM with the change in the load condition. The efficiency of the proposed technique is determined by implementing a DC-DC converter and calculating the conduction...
The paper is focused on the numerical calculation of total losses in each power device of 3L-ANPC (Active-NPC) and 3L-ASNPC (Active-Stacked-NPC) multilevel converters in a STATCOM application. Due to the symmetry of the structures the conduction and switching losses are calculated only for half of power devices. The modulation functions and the conduction/switching intervals are elaborated in order...
The aim of this document is to discuss PWM strategies on 3-level NPC H-bridge topology. This structure is composed of three cells, each one contains two 3-level NPC legs. In this paper, we present a structure allowing the achievement of 6 kV phase to phase motor voltage and a control strategy that enables to obtain 5 levels on output voltage. However, using asynchronous PWM at high speed use, switching...
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