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Low Side bidirectional battery disconnect switch

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Oveis.Gharan

Oveis.Gharan

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Dear All,
I want to design a low-side bidirectional battery disconnect switch for controlling the battry connection meanwhile its charging/discharging in a BMS.
Is there anyone who could suggest me a circuitry to conroll the connection via a Microcontroller?

Thanks in advance.
BR
Oveis
 

Try this:

img_igbtmod_04.jpg

tie the gates together.
ground emitters, control to gates

the diodes are parasitic with the IGBT
 

Hi,

you may use a solid state relay, or photoMOS, or a mechanical relay.

You know: You didn´t give any specification about voltage, current, speed....thus we can only guess.

Klaus
 

Aren't the IGBTs Ron higher than the desired values?!
Don't you suggest the driving circuitry?
 

Hi,

Aren't the IGBTs Ron higher than the desired values?!

--> Please tell us your "desired values"

Klaus
 

Aren't the IGBTs Ron higher than the desired values?
Click to expand...

Since the power stage of the IGBT`s are based on a BJT structure, it is not usual refer to their Rdson parameters, but rather to their Vceon parameters.
 

The circuit in post #2 can also be used with power MOSFET's.
IGBT's have a specified voltage drop. Power MOSFET's have a specified resistance.
IGBT's are good for high voltage cricuits. Power MOSFET's are better for low voltage circuits.

Please give specifications/requirements for the "battery disconnect switch".
 

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