Design Switching Mode Power Supply Using Boost Converter Continuous Mode

Masrul , Masran (2007) Design Switching Mode Power Supply Using Boost Converter Continuous Mode. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The SMPS that has been designed is using a topology of boost converter that will step up a 12V de input into 24V de of output. Firstly, SMPS is smaller than linear power supply, and yet also, it has a higher efficiency, which is up to 85%. The linear regulator can, therefore, tend to be very inefficient. The switch mode power supply, however, uses a high frequency switch (in practice a transistor) with varying duty cycle to maintain the output voltage. The ripple output voltage caused by the switching are filtered out by an LC filter. SMPS can be used to step-down a supply voltage, just as linear supplies do. Unlike a linear regulator, however, an SMPS can also provide a step-up function and an inverted output function. The mode operation of this project is continuous mode, by then, the inductor used must be large enough than minimum value of calculated inductor to ensure the inductor current is continuous. Since this is a high frequency converter, a MOSFET is used as a switch to meet the requirement of the SMPS. The output voltage is larger than the input level. All the input will be in de form and an appropriate value of capacitor is used to minimize the ripple voltage. Before implementing the topology into hardware, the simulation process will be done to compare the result with the hand calculation. The basic operation of SMPS is also describe and presented in this report paper. For the design solution, the implementation of DC/DC boost converter contains two subsystems- a conventional PWM boost converter, and a PWM control circuit. An ic UC3525A is used to produce the gating signals and drives the Metal-Oxide Semiconductor Field Effect Transistors (MOSFET), allowing the converter's output to be kept steady at 24V through pulse width modulation. A switching frequency of 50 KHz is used.

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