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Q&A Which transistor type to use for charge shuttle, as part of an active charging circuit?

Hi All! I've been looking at how to perform active battery balancing, and I'm currently struggling to understand which type of transistor to use to act as the switch for the "balancing capacitor"....

2 answers  ·  posted 3mo ago by Boolean‭  ·  last activity 3mo ago by absurdus‭

#1: Initial revision by user avatar Boolean‭ · 2024-09-29T11:50:48Z (3 months ago)
Which transistor type to use for charge shuttle, as part of an active charging circuit?
Hi All!

I've been looking at how to perform active battery balancing, and I'm currently struggling to understand which type of transistor to use to act as the switch for the "balancing capacitor".

Taking this example from a [Texas Instruments paper](https://www.ti.com/download/trng/docs/seminar/Topic%202%20-%20Battery%20Cell%20Balancing%20-%20What%20to%20Balance%20and%20How.pdf) as an example:

![Charge shuttler example image from TI paper on page 8](https://electrical.codidact.com/uploads/4qjlixqpa7raa7g7kmedwahhgyzv)

What would be a suitable transistor to use for the 2 way switches?

I've figure probably not an IGBT since their gate requires too much current, while a BJT would be too wasteful as well, so would that mean a MOSFET or JFET is the best choice?