The current invention provides a method for enhancing the formation stability of water sensitive, reactive formations penetrated by a wellbore. A power regulator may include a first driver including a first switch and a second switch, where a power dissipation of the first switch is less than a power dissipation of the second switch. Therefore, when a control switch is replaced with another type, it is unnecessary to change the control device but just connect it to a corresponding control module, able to save manufacturing cost.