Abstract
A dual-output LLC resonant converter using pulse frequency modulation (PFM) and asymmetrical pulse width modulation (APWM) can achieve tight output voltage regulation, high power density, and high cost-effectiveness. However, an improper resonant tank design cannot achieve tight cross regulation of the dual-output channels at the worst-case load conditions. In addition, proper magnetizing inductance is required to achieve zero voltage switching (ZVS) of the power MOSFETs in the LLC resonant converter. In this paper, voltage gain of modulation methods and steady state operations are analyzed to implement the hybrid control method. In addition, the operation of the hybrid control algorithm is analyzed to achieve tight cross regulation performance. From this analysis, the design methodology of the resonant tank and the magnetizing inductance are proposed to compensate the output error of both outputs and to achieve ZVS over the entire load range. The cross regulation performance is verified with simulation and experimental results using a 190 W prototype converter.
Highlights
Many industry fields require well-regulated multiple output voltages to guarantee the stable operation of products, such as ultra-high-definition (UHD) TVs, computers, and other home appliances
The simulation results verify the performance enhancement of tightly regulated output voltage of the hybrid control algorithm verify the performance enhancement of tightly regulated output voltage of the hybrid control compared compared to the conventional cross regulation method
11a shows a photograph of the prototype converter which has two outputs and a control algorithm
Summary
Many industry fields require well-regulated multiple output voltages to guarantee the stable operation of products, such as ultra-high-definition (UHD) TVs, computers, and other home appliances. To satisfy this requirement, point-of-use power supplies (PUPS) have been used for multiple output applications. The secondary side post regulators (SSPR) have been proposed to tightly regulate the output voltage with small output voltage error. They can regulate each output voltage independently, additional switches, gate driving circuits, and voltage controllers are required [8,9,10,11,12,13,14,15,16,17,18,19,20]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
