The need to make our power supplies smaller yet still being able to put out as much or more power, has increased substantially over the years. Increasing the switching frequency allows us to reduce the size of the magnetics but it also greatly increases the switching losses. Zero-voltage switching helps to eliminate these major switching losses in our primary FET by allowing us to turn on the FET when there is 0 volts(near 0) volts across it. The Active clamp flyback and the LLC topologies both utilize ZVS to reduce switching loss, decrease the size, increase overall efficiency, and improve thermal performances. This presentation will firstly look at the battery charging application and what does the typical 250W charger look like today. Both the ACF and LLC 250W battery charger designs will be analyzed and their tradeoffs carefully highlighted. This will help the audience carefully pick the right approach when designing their next battery charger.
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