Patent ID: 8243474

Claim:
A control circuit for power supplying, electrically connecting a power supply module to provide a load current in a first direction to an inductive load, the control circuit for power supplying comprising: a driving module having a first end point, a second end point, a third end point, and a fourth end point, the first end point electrically connecting to a high potential terminal of the power supply module, the second end point electrically connecting to a ground terminal, the third end point and the fourth end point electrically connecting to two ends of the inductive load respectively, the driving module further comprising a plurality of switches: a first switch of the plurality of switches electrically connected between the first end point and the third end point; a second switch of the plurality of switches electrically connected between the second end point and the fourth end point; a third switch of the plurality of switches electrically connected between the first end point and the fourth end point; and a fourth switch of the plurality of switches electrically connected between the second end point and the third end point; and a control module electrically connecting the high potential terminal, the ground terminal and the driving module, wherein in a first power supply mode that the first switch and the second switch are turned on and the third switch and the fourth switch are turned off, the load current flows to the ground terminal via the first end point, the first switch, the third end point, the inductive load, the fourth end point, the second switch, and the second end point; and, while in the first power supply mode, upon when the control module sends a switching signal to the driving module, the first switch and the second switch are turned off and the third switch and the fourth switch are turned on, and the load current flows to the high potential terminal via the second end point, the fourth switch, the third end point, the inductive load, the fourth end point, the third switch and the first end point; wherein when the power supply module is in a powered-off state, the control circuit for power supplying utilizes the inertia characteristics of the inductive load and switch the plurality of switches to change the first direction of the load current to a second direction to provide a different power supplying path to the control module.