Abstract: A motor driving circuit capable of outputting a dual FG signal includes a control unit, a first Hall unit, a second Hall unit and a logic unit. The control unit is electrically connected to the first Hall unit and configured to generate a first FG signal based on a Hall signal sent by the first Hall unit. The second Hall unit is configured to detect the change in magnetic fields to generate a second FG signal to the logic unit. The logic unit is electrically connected to the control unit and the second Hall unit. The logic unit is configured to perform a logic operation based on the received first and second FG signals to convert them into a dual FG signal for an external system. With the control unit, the first Hall unit, the second Hall unit and the logic unit being integrated in the motor driving circuit, the convenience in use can be improved greatly. Furthermore, the working hours and the production cost can be reduced.

Abstract: The present invention provides a circuit structure capable of straight/reverse connection of positive and negative electrodes of an input power source, which includes a load, an input power portion, a protection unit, a first switch unit and a second switch unit. The first switch unit and the second switch unit can respectively select an ON or OFF state based on the electrical polarities of a first electrode end and a second electrode end of the input power portion. By this arrangement, the circuit structure of the present invention can be operated normally no matter whether the positive and negative electrodes of the input power source are straightly or reversely connected.

Abstract: A motor driving circuit capable of outputting a dual FG signal includes a control unit, a first Hall unit, a second Hall unit and a logic unit. The control unit is electrically connected to the first Hall unit and configured to generate a first FG signal based on a Hall signal sent by the first Hall unit. The second Hall unit is configured to detect the change in magnetic fields to generate a second FG signal to the logic unit. The logic unit is electrically connected to the control unit and the second Hall unit. The logic unit is configured to perform a logic operation based on the received first and second FG signals to convert them into a dual FG signal for an external system. With the control unit, the first Hall unit, the second Hall unit and the logic unit being integrated in the motor driving circuit, the convenience in use can be improved greatly. Furthermore, the working hours and the production cost can be reduced.