Efficiency of Low Voltage Up/Down DC-DC Converters: A Matter of Components Choice
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Pereira F. R., Department of Design Product - ESDI, State University of Rio, Rio de Janeiro, Brazil.
The low input and output ripple currents and the possibility to operate as either a step-down or step-up converter make the Čuk converter attractive to many purposes. However, the components used in the construction of the Čuk converter are subjected to higher currents than those found in other topologies, which makes the efficiency of these converters not satisfactory, particularly in low voltage applications. This paper describes the design of a Čuk converter to apply a constant current to a power LED, using as input the operating voltage range of a Li-ion battery. The careful choice of components used in the design allowed a high efficiency for this type of converter, even when used at low voltages. The results show that it is possible to supply a constant current of 1 A for a 3.5 W power LED throughout the useful range of voltages generated by lithium ion battery (4.2 V to 3.0 V) with 90% efficiency.
Čuk Converter, Efficiency, Switching Power Supplies, Ion-Lithium
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