Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 1, Pages 42-48Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3098731
Keywords
Switches; Zero voltage switching; Control systems; Voltage control; Switching loss; Logic gates; Pulse width modulation; DC-DC power converters; power supplies; pulse width modulation converters
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2021R1I1A3050095]
- National Research Foundation of Korea [2021R1I1A3050095] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This paper proposes a slam control method to improve the efficiency of a boost converter at light load condition while maintaining its voltage conversion ratio. By applying full duty-ratio to the switch during predetermined time, the light load efficiency is significantly increased and the output voltage is sufficiently boosted. In addition, quasi-resonant operation enables zero voltage switching, reducing further switching loss.
The burst-mode control is one of the most effective methods to improve the efficiency of a converter at the light load condition, but it inevitably reduces the voltage conversion ratio of the converter. In this letter, we propose a slam control for improving light load efficiency of the boost converter while maintaining its voltage conversion ratio. The proposed control method applies the full duty-ratio to the switch during predetermined time, which significantly increases the light load efficiency and sufficiently boosts the output voltage. In addition, the quasi-resonant operation enables zero voltage switching at the switch; thus, reducing further switching loss. This slam control can be easily implemented by adopting OR gate to synthesize the slam carrier and switching carrier. The feasibility and effectiveness of the proposed control were verified by the experimental results from a 20-W prototype. The power conversion efficiency was increased by more than 20% at the light load condition.
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