DocumentCode :
1988827
Title :
A high voltage battery charger with smooth charge mode transition in BCD process
Author :
Yang, Shang-Hsien ; Liu, Jen-Wei ; Wu, Yi-Hong ; Wang, Deng-Sian ; Wang, Chua-Chin
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
fYear :
2011
fDate :
15-18 May 2011
Firstpage :
813
Lastpage :
816
Abstract :
A 60 V battery charger implemented using TSMC 0.25 μm Bipolar-CMOS-DMOS (BCD) 60 V process is presented in this work. A novel transition method is proposed to ensure smooth transitions between constant current (CC) and constant voltage (CV) modes. Since the proposed approach would require only additional diodes, power consumption and chip area are conserved in comparison with other sophisticated methods proposed in prior works. The charger sources a current of 50 mA in CC mode and has an efficiency of 75% ~ 80% throughout the charging sequence. The supply voltage is kept at 3 volts higher than the battery voltage throughout the charging sequence to maintain charging efficiency. A thermal protection circuit is included in this design to prevent the charger from operating at a temperature over the maximum allowed temperature.
Keywords :
CMOS integrated circuits; battery chargers; power consumption; BCD process; TSMC bipolar-CMOS-DMOS; charging efficiency; charging sequence; chip area; constant current; constant voltage; current 50 mA; high voltage battery charger; power consumption; size 0.25 mum; smooth charge mode transition; thermal protection circuit; voltage 60 V; Batteries; CMOS integrated circuits; Capacitors; Hysteresis; Logic gates; Schottky diodes; Transistors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
ISSN :
0271-4302
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
Type :
conf
DOI :
10.1109/ISCAS.2011.5937690
Filename :
5937690
Link To Document :
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