Calculate boost converter output current

We'll derive the various equations for the current and voltage for a boost converter and show the tradeoffs between ripple current and inductance. For this discussion we assume that the converter is in the continuous mode, meaning that the inductor's current never goes to zero. Where V D is the voltage drop across the diode, and V Trans is the voltage drop across the transistor.

So it is clear that the output voltage is related directly to the duty cycle of the pulses. The main question when designing a converter is what sort of inductor should be used. In most designs the input voltage, output voltage and load current are all dictated by the requirements of the design, whereas, the Inductance and ripple current are the only free parameters.

It can be seen form Equation 1, that the inductance is inversely proportional to the ripple current. In other words, if you want to reduce the ripple, then use a larger inductor. Thus, in practice a ripple current is decided upon which will give a reasonable inductance. There are tradeoffs with low and high ripple current. Large ripple current means that the peak current is i pk greater, and the greater likelihood of saturation of the inductor, and more stress on the transistor.

So when choosing an inductor make sure that the saturation current of the inductor is greater than i pk. Likewise, the transistor should be able to handle peak current greater than i pk.

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Asked 9 years, 4 months ago. Active 9 years, 4 months ago. Viewed 4k times. W5VO Add a comment. Active Oldest Votes. Adam Lawrence John Rennie John Rennie 3 3 silver badges 5 5 bronze badges.

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