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Application Report
SLVA194 – AUGUST 2004
Single-cell Battery Discharge Characteristics Using the
TPS61070 Boost Converter
SK Loo and Keith Keller ...................................................................... Power Management Products
ABSTRACT
This application report presents practical single-cell battery discharge characteristics in
real-world application, and primarily focuses on the varying internal impedance of a
battery and how that affects the battery terminal voltage.
Contents
1 Introduction ........................................................................................ 2
2 Battery Chemistry and Circuit Model ......................................................... 2
3 Battery Terminal Voltage vs Internal Cell Voltage.......................................... 3
4 Internal Resistance of a Battery vs Battery Energy State ................................ 5
5 Alkaline Battery Testing ......................................................................... 5
6 NiMH Battery Testing ............................................................................. 7
7 Device Start-up vs Temperature ............................................................... 9
8 Summary .......................................................................................... 10
List of Figures
1 Battery Structure, Basic Circuit Model, and Discharge Characteristics ............... 3
2 Discharge Curve of Single-Cell Battery Under Different Load Conditions ............ 3
3 A Typical AA-Size Alkaline Battery Voltage
at No Load Versus at 330-mW Discharge .................................................... 4
4 Open Load and 85-mW Step Load of Alkaline Battery
with Terminal Voltage of 1.4 V (Left) and 1.3 V (Right) .................................... 6
5 Open Load and 85-mW Step Load of Alkaline Battery
with Terminal Voltage of 1.25 V (Left) and 1.22 V (Right) ................................. 6
6 Pulse Load of 10-sec Duration Showing the Battery
Open Load Voltage (Left) and Loaded Voltage
Until Device Shutdown (Right) ................................................................. 6
7 Open and Step Load of NiMH Battery at Almost-Full Energy Capacity
of 800 mAH (Left)—Open and Step Load of NiMH Battery
at 1/2-Full Energy Capacity of 800 mAH (Right) ........................................... 7
8 Open and Step Load of NiMH Battery at 1/4-Full Energy Capacity
of 800 mAH (Left)—Open and Step Load of NiMH Battery
at 1/10-Full Energy Capacity of 800 mAH (Right) ........................................... 8
9 Pulse Load of 10-sec Duration Showing the
Battery Open-Load Voltage (Left) and Loaded Voltage
Until Device Shutdown (Right) ................................................................. 8
10 Pulse Load of 10-sec Duration Showing the AAA-Size NiMH Battery
Open Load Voltage (Left) and Loaded Voltage
Until Device Shutdown (Right)—550 mAH Capacity ....................................... 9
Single-cell Battery Discharge Characteristics Using the TPS61070 Boost ConverterSLVA194 – AUGUST 2004 1
Verzeichnis
- ・ Technische Daten on Seite 5
- ・ Anwendungsbereich on Seite 11
