Battery Technology - May 2021 - 7

Active Charge
Control

Q2

Pro

Con

Vs

MOSFET
C1

R2

More efficient than passive
charge control methods

Sensitive to transients

Easy to control gate voltage

Charge control circuit can be large

Most efficient

Complex

Supercap stack monitoring
and voltage regulation

Expensive

Q1

Logic
Signal

CLOAD

IC

R1

Table 3. Pros and cons of a MOSFET and IC chipset.
Figure 8. Typical integrated load switch
using a MOSFET driver.

I(A)
V (volt)

Current

Voltage

Time (s)

Figure 9. Constant current/constant voltage
supercapacitor charge control.

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This article was written by Ron Demcko,
Joe Hock, Ashley Stanziola, and Daniel
West of AVX Corporation, Fountain Inn, SC.
    



	


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Battery Technology - May 2021

Table of Contents for the Digital Edition of Battery Technology - May 2021