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An AC-DC converter is designed for supplying light-load digital circuits in a biomedical implant. When the AC input is just above the DC output (VDCo), a boosted switch is turned on and then turned off according to the load current by controlling the switch timing via a feedback loop. A power efficiency of 93.8% is achieved with a 3.5 V peak AC input, VDCo = 2 V, and an output power of 10 mW.
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input applications...
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