Single-Ended DC-to-DC Converter with Two Individually Controlled Outputs

Abstract

This paper introduces a DC-to-DC converter which simultaneously regulates two output voltages individually by turning a transistor switch on and off to give good regulation and high conversion efficiency. The converter combines a buck and a buck-boost converter through one transistor switch; the buck circuit operates in the continuous inductor current mode, and the buck-boost circuit operates in the discontinuous inductor current mode. Together they can regulate two output voltages by controlling the duty ratio and operating frequency of the switching operation. 191CH1353-2/78/0000-0191$00.75 (©) 1973 IEEE

Zero Voltage Switching Control Method for MHz Boundary Conduction Mode Converters

“…The time to achieve ZVS can be calculated as shown in (3). Where the initial current condition and the extra conduction time t e after zero current condition to achieve ZVS conditions, can be calculated by solving for the inductor initial current condition i L (0) or by evaluating the energy transfer in the ideal resonant circuit.…”

“…Compared to linear regulators, SMPS can ideally reach efficiencies up to η = 100 %. This technology, based on the combination of reactive elements with any type of switch, was initially developed employing mechanical switches, vacuum tubes, and finally semiconductor based switches such as thyristors, bipolar junction transistors (BJT), and Metal Oxide Semiconductor Field Effect Transistors (MOSFET) [1], [2], [3].…”