Full-Soft-Switching High Step-Up Bidirectional Isolated Current-Fed Push-Pull DC-DC Converter for Battery Energy Storage Applications IEEE Electrical Projects


This paper now a novel bidirectional current fed push-pull DC-DC converter topology with driving isolation. The control algorithm planned enables full-soft-switching of all transistors in a wide range of input voltage and power with no need for snubbers or resonant switching. The converter features an active voltage doubler rectifier controlled by the switching sequence synchronous to that of the input-side switches.


As a result, full-soft-switching operation at a fixed switching density is reach. Operation principle for the energy transfer in both directions is specify, followed by verification with a 300 W experimental prototype. The converter has greatly higher voltage step-up work than classical current-fed converters Experimental results get are in good agreement with the theoretical steady-state search.


  1. Current-fed dc-dc converter
  2. Bidirectional converter
  3. Soft-switching
  4. ZVS
  5. ZCS
  6. Push-pull converter
  7. Switching control method
  8. Naturally clamped




Fig. 1. Full-soft-swithicng CF push-pull converter proposed.


Fig. 2. Experimental current and voltage waveforms of the switch S1.1


Fig. 3. Experimental current and voltage waveforms of the switch S1.2.


Fig. 4. Experimental current and voltage waveforms of the switch S4.


A novel bidirectional current-fed push-pull converter with driving isolation was imported. It features full-soft switching operation of all semiconductor components, while its DC voltage gain is higher than in traditional current-fed converters due to the application of the flowing energy for the input voltage step-up.


As a result, it does not suffer from short break of energy transfer from the input side to the output side since at least half of the switching period is loyal for this. Moreover, it does not want any clamping circuits, since the novel control algorithm features natural clamping of the switches at the current-fed side. Despite a relatively high number of semiconductor components, it shows the peak efficiency of 96.3%.


which does not depend on the energy transfer direction for the equivalent operating point. Soft-switching operation with continuous current at the current fed side makes the converter planned suitable for residential battery energy storage systems. Further research will be directed towards experimental verification of the converter work with a lithium iron phosphate battery.


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