Isolated Topologies of Switched-Resonator Converters

Abstract

Switched-resonator converters are a new family of soft switching DC-DC converters where the energy is transferred via a resonator. This paper introduces some isolated topologies of this family. The achieved advantages include, load independent soft-switching, self short-circuit protection, and optimization capability due to topology variety. Compared to conventional seriesresonant converters, outstanding advantages such as a smaller fewer number of switches and diodes, a smaller transformer, and lower current stresses are achieved. A general synthesis scheme, functional topologies, and essential relations are included. Experimental results from a laboratory prototype confirm the presented theoretical analysis.

Resonant Pulse Power Converter with a Self-Switching Technique

“…The capacitors C S and C in and the diode D 2 take the role of a peak detector. The capacitor C S stores enough energy to ignite the P-MOSFET S 2 and the N-MOSFET S 1 . The capacitor C in also stores the input energy and takes the role of ignition of the P-MOSFET S 2 .…”

“…[1] To utilize the resonance for power conversion requires detecting the peak value or the zero instant of the voltage/current, which can be realized with additional circuit components such as sensors or switching ICs. However, especially in the very small power area, additional circuit components increase both the cost of the circuit and the volume of the circuit, and they require an additional power source to drive them properly.…”

Resonant CLL Non-Inverting Buck-Boost Converter

“…A major advantage is that in RCs no bulky inductor is required and hence the converter volume and size are reduced [18]- [26]. RCs with high-order resonant tank such as LLC, LCC, LCT, … are developed to attain/improve the expected features [21]- [26]. However, almost all RCs are isolated topologies where even by omitting the transformer no common ground is found between input and output terminals.…”

“…Soft-switching conditions are attained by switching under zero-voltage (ZVS) and/or zero-current (ZCS) [11]- [26]. In Quasi-Resonant Converters (QRC), by adding a resonant network to the basic PWM converter soft-switching conditions are provided [11]- [14].…”

“…In Resonant Converters (RC), soft-switching conditions are attained by using a resonant network as the medium of power transfer. A major advantage is that in RCs no bulky inductor is required and hence the converter volume and size are reduced [18]- [26]. RCs with high-order resonant tank such as LLC, LCC, LCT, … are developed to attain/improve the expected features [21]- [26].…”