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An Ultra-Compact and Efficient Li-ion Battery Charger

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I'am Ajas
I'am Ajas
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An Ultra-Compact and Efficient Li-ion Battery Charger Circuit for Biomedical Applications TOPIC :
INTRODUCTION Analog Li-ion battery charging circuit intended for operation in a wirelessly rechargeable medical implant. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],BACKGROUND
Problems encountered in previous charger designs ,[object Object],[object Object],[object Object],[object Object]
Theoretical Li-ion charging profile ,[object Object],[object Object],[object Object],[object Object]
Theoretical Li-ion charging profile ,[object Object],[object Object],[object Object],[object Object]
Simplified battery charger block diagram ,[object Object],[object Object],[object Object],[object Object],BLOCK DIAGRAM
Wilson Current Mirror ,[object Object],[object Object],Wilson Fudh current source
simple current mirror Wilson current mirror ,[object Object],[object Object],[object Object],Disadvantages of simple current mirror
[object Object],[object Object],[object Object],Operational Transconductance Amplifier Schematic symbol for the OTA . Different types of OTA .
OTA and trickle-charge circuit schematic ,[object Object],[object Object],[object Object],[object Object]
End-of-charge current comparator ,[object Object],[object Object],[object Object]
Trickle charge threshold detector ,[object Object],[object Object],[object Object],[object Object]
Advantages over other charger designs ,[object Object],[object Object],[object Object],[object Object]
System Performance during trickle-charge ,[object Object],[object Object]
System Performance during constant current, constant voltage, and end-of-charge. ,[object Object],[object Object],[object Object],[object Object],[object Object]
Comparison of this design with previous Li-ion charger circuits in the literature . ,[object Object],[object Object],Design Power Efficiency Layout Area Charge-Pump Technique 67.9% 1.96 mm2 Hysteresis-current-controlled buck converter 82% 2.6 mm2 A Multi- Mode LDO-Based Li-ion Battery Charger 72.3% Not Specified This Work 75% 0.15 mm2
CONCLUSION ,[object Object],[object Object],[object Object]
REFERENCES ,[object Object],[object Object],[object Object],[object Object],[object Object]
THANK YOU

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  • 1. An Ultra-Compact and Efficient Li-ion Battery Charger Circuit for Biomedical Applications TOPIC :
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