If you file a joint tax return, and your refund will be taken to pay your spouse's back child support, then you are an injured spouse. Attach Form 8379 to your joint tax return.
Pennsylvania is not a community property state, so part of the refund that is due to your income or credits may be refunded to you. The part of the refund that is your spouse's will be kept. There is no guarantee that this will happen, but it is sure that the only way will get a refund is to request an allocation of the refund using Form 8379.
If your husband has been receiving workers compensation, that is not taxable. But other forms of disability income may be taxable. Because of this and the injured spouse issue, you may want to have a professional do your taxes this year.