18.3 A 120mA Non-Isolated Capacitor-Drop AC/DC Power Supply
Yogesh Ramadass, Andres Blanco, Xiao Boqiang, John Cummings
Abstract
A wide variety of offline applications ranging from electricity meters, appliances, smoke alarms to ground fault detectors require a non-isolated DC supply that is powered directly from the AC mains. These applications typically require the ability to handle up to 305VAC,rms at the input while providing a regulated 5V/3.3V output at load currents ≤ 100mA, Small enclosure sizes in industrial electronics and home automation systems dictate the need for small form factors. In electricity metering, industry standards set targets for quiescent power and low-load efficiency of the system.
Topics & Concepts
Mains electricityMetering modeElectrical engineeringElectricityCapacitorRangingEngineeringElectronicsAutomotive engineeringComputer scienceVoltageTelecommunicationsMechanical engineeringLow-power high-performance VLSI designAdvanced Battery Technologies ResearchAdvanced DC-DC Converters