DC-DC Converters - eBook

Most electronic devices need power to function, typically a constant supply voltage. Because fluctuations can happen at the load or the input power source, voltage regulators are used to supply constant voltages. Increased circuit complexity has contributed to the demand for more reliable and efficient DC-DC converter designs. This eBook covers the fundamentals of DC-DC converters and their industrial and commercial applications.

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2.1 Operation of a DC-DC Converter

Figures 1a and 1b depict a step-up DC-DC converter (boost converter) with an inductor L connected in

series with a voltage source VIN. A FET, such as a MOSFET, is switched on and off at a specific frequency.

When the MOSFET is turned ON for a given time period (Ton), the current flows through the inductor and

stores the energy in the form of magnetic energy, as shown in Figure 1a. The dotted line depicts a slight

leakage current. When the MOSFET is turned OFF, the current stored in the inductor flows through the

diode and the load for the time Toff, as shown in Figure 1b. The resulting voltage at the load is calculated

as VOUT = VIN + L (di/dt), where di/dt is a measure of how the current changes with time. If the MOSFET is in

the ON state for a longer duration, a much larger electric current is accumulated in the inductor, allowing

the retrieval of a larger voltage. However, if the MOSFET is in the ON state for too long, the time to supply

power to the load side becomes too short, resulting in increased losses and deterioration in conversion

efficiency. It is important to design a DC-DC converter so that the maximum duty cycle is not exceeded to

avoid damaging the components and ensure stable operation.

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DC-DC Converters - eBook

Here's a Sample of the DC-DC Converters eBook

Download the eBook now!

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