Design consideration of CC-CV controller of LLC resonant converter for Li-ion battery charger
- Resource Type
- Conference
- Authors
- Park, Ki-Hyeon; Choi, Yeong-Jun; Choi, See-Young; Kim, Rae-Young
- Source
- 2015 IEEE 2nd International Future Energy Electronics Conference (IFEEC) Future Energy Electronics Conference (IFEEC), 2015 IEEE 2nd International. :1-6 Nov, 2015
- Subject
- Power, Energy and Industry Applications
Voltage control
Mathematical model
Batteries
Switching frequency
Capacitors
Battery chargers
Integrated circuits
- Language
In this paper, the design consideration of the dual control scheme of a LLC resonant converter for a Li-ion battery charger is proposed to stabilize operation during whole charging process. The theoretical approach of constant-current and constant-voltage controller is presented when considering the nonlinear property of a Li-ion battery under wide ranged output voltage. By applying the extended describing function method, the small-signal ac model of the resonant converter is obtained. The feedback controller is designed to guarantee stable and robust, while providing a desired crossover frequency and sufficient phase margin. Several simulation results are provided in order to verify the effectiveness of the proposed design consideration.