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2.2. Boost

As in the previous case, the boost converter (step-up converter) also has a common input and output ground, but in this case, the output voltage is always higher than the input voltage. Its operation consists of an on cycle of the Q transistor, during which time the L coil energy is charged. Then, the coil discharges this energy through D when Q is not on. Since during this second stage, the coil terminal voltage is in series with the input voltage, the output voltage will always be higher than the input voltage. As it is apparent, if the Q switch is off, the input will be directly connected to the output. As a result, the output current cannot be ele ctronically limited in this type of converter.