• • • BATTERIES & CHARGERS • • •
all battery cells (lead acid batteries are rugged and can handle this).
CONCLUSION
Both active and passive cell balancing are effective ways to improve system health by monitoring and matching the SoC of each cell. Active cell balancing redistributes charge during the charging and discharging cycle, unlike passive cell balancing, which simply dissipates charge during the charge cycle. Thus, active cell balancing increases system run time and can increase charging efficiency. Active balancing requires a more complex, larger footprint solution; passive balancing is more cost effective. Whichever method works best in your application, Analog Devices offers solutions for both, which are integrated into our battery management ICs (such as the LTC6803 and LTC6804) and complementary devices that work in conjunction with these ICs to provide a precise, robust battery management system.
Figure 5. 12 cell battery stack module with active balancing
ABOUT THE AUTHORS
Kevin Scott works as a product marketing manager for the Power Products Group at Analog Devices, where he manages boost, buck-boost and isolated converters, LED drivers, and linear regulators. He previously worked as a senior strategic marketing engineer, creating technical training content, training sales engineers, and writing numerous website articles about the technical advantages of the company’s broad product offering. He has been in the semiconductor industry for 26 years in applications, business management, and marketing roles. Kevin graduated from Stanford University in
1987 with a B.S. in electrical engineering and started his engineering career after a brief stint in the NFL. He can be reached at
kevin.scott@
analog.com. Sam Nork joined Linear Technology (now part of
Analog Devices) as a senior product engineer at the company’s Milpitas, CA headquarters in 1988. In 1994, he relocated to the Boston area to start up and manage an analog IC design center where he continues to work today. Sam has personally designed and released numerous integrated circuits in the area of portable power management, and is inventor/co-inventor on seven issued patents. As director of ADI’s Boston Design Center, Sam leads a team of nearly 100 people and oversees day-to-day development activity for a wide variety of analog integrated circuits in areas including portable power management, high speed op amps, industrial ADCs, system monitors, and energy harvesting. Previously, Sam also worked for Analog Devices in Wilmington, MA as a product/test development engineer. He received A.B. and B.E. degrees from Dartmouth College. He can be reached at
samuel.nork@
analog.com.
ANALOG DEVICES INTERNATIONAL
analog.com
electricalengineeringmagazine.co.uk Figure 7. Four battery balancer with programmed high and low battery voltage fronts Figure 6. High efficiency bidirectional balancing
ELECTRICAL ENGINEERING • JULY/AUGUST 2021 27
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44
