Powershell script to check SQL 2012 AlwaysOn before patching

In our environment, we are running Microsoft Systems Operations Manager for patching. I'm looking for powershell script to check my SQL 2012 AlwaysOn status before kicking of the patches. Here is a senario:

I have three node cluster (A,B,C) with multi subnet cluster. A and B is in Primary DC and C is in DR DC. Currently, A is a primary replica and B,C are secondary replicas. Here is a patching schedule:

3RD Weekend of the month:

2am – A

4am – B

From this schedule, it would cause SQL 2012 AlwaysOn rollover twice and we don't want that. What we really want is to have a powershell script to check and patch the 2nd Replica (B) then patch primary replica(A). In this senario, it would cause AlwaysOn to rollover only once.

Please help.

Thanks,

KongDBA