Abstract: A switch drive circuit for a fan processor is applied to a fan processor. The switch drive circuit includes multiple upper arm switch components, multiple lower arm switch components correspondingly electrically connected with the upper arm switch components, a first drive switch unit and a second drive switch unit. The upper arm switch components are driven by a first pulse width modulation signal and a second pulse width modulation signal. The first and second drive switch units serve to receive a third pulse width modulation signal and a high-frequency puke width modulation signal. The third pulse width modulation signal is switched between a voltage high-level state and a voltage low-level state to trigger and turn on the lower arm switch components.

Abstract: A method for preventing a fan from burning down includes steps of: using a central processing unit (CPU) to detect rotational speed of forward operation of a fan and defining as a highest backward rotational speed value; using the CPU to detect operation direction and rotational speed of backward operation of the fan; and using the CPU to activate the fan to operate forward or activate a rotation stop control signal to stop the fan when the fan impeller rotates forward or backward by return air, if the rotational speed of the rotation stop control signal is smaller or larger than the highest backward rotational speed value, the CPU activating the fan to operate forward or making the fan to generate a warning signal and keeping providing the rotation stop control signal. The method can prevent the fan from burning down and enhance the stability.

Abstract: The present invention provides a motor driving circuit to reduce switching loss, which is applied to a motor. The motor driving circuit comprises a motor driving unit, a push-pull output unit, and a control unit. The control unit is coupled to the motor driving unit and the push-pull output unit. The control unit transmits a driving voltage to drive the push-pull output unit such that the push-pull output unit generates amplified currents which are transmitted to the motor driving unit. The motor driving unit reduces charge/discharge periods thereof based on the received amplified currents.

Abstract: A switch drive circuit capable of saving timers of fan processor is applied to a processor. The switch drive circuit includes multiple upper arm switch components, multiple lower arm switch components correspondingly electrically connected with the upper arm switch components, a first drive control unit and a second drive control unit. The upper arm switch components are driven by a first pulse width modulation signal and a second pulse width modulation signal. The first and second drive control units serve to receive a third pulse width modulation signal and a high-frequency pulse width modulation signal. The third pulse width modulation signal is switched between a high-level state and a low-level state to trigger and turn on the lower arm switch components.

Abstract: A method for preventing a fan from burning down includes steps of: using a central processing unit (CPU) to detect rotational speed of forward operation of a fan and defining as a highest backward rotational speed value; using the CPU to detect operation direction and rotational speed of backward operation of the fan; and using the CPU to activate the fan to operate forward or activate a rotation stop control signal to stop the fan when the fan impeller rotates forward or backward by return air, if the rotational speed of the rotation stop control signal is smaller or larger than the highest backward rotational speed value, the CPU activating the fan to operate forward or making the fan to generate a warning signal and keeping providing the rotation stop control signal. The method can prevent the fan from burning down and enhance the stability.

Abstract: The present invention provides a motor driving circuit to reduce switching loss, which is applied to a motor. The motor driving circuit comprises a motor driving unit, a push-pull output unit, and a control unit. The control unit is coupled to the motor driving unit and the push-pull output unit. The control unit transmits a driving voltage to drive the push-pull output unit such that the push-pull output unit generates amplified currents which are transmitted to the motor driving unit. The motor driving unit reduces charge/discharge periods thereof based on the received amplified currents.

Abstract: A circuit structure applied to a motor and enabling upgraded MOS transistor heat dissipation ability is disclosed. The circuit structure includes a motor driving unit and a signal processing unit. The signal processing unit is connected to the motor driving unit for maintaining a first and a third switch of the motor driving unit at a constant turn-on voltage and boosting turn-on voltages of a second and a fourth switch of the motor driving unit, so as to effectively upgrade the heat dissipation ability of the first, second, third and fourth switches.

Abstract: A circuit structure applied to a motor and enabling upgraded MOS transistor heat dissipation ability is disclosed. The circuit structure includes a motor driving unit and a signal processing unit. The signal processing unit is connected to the motor driving unit for maintaining a first and a third switch of the motor driving unit at a constant turn-on voltage and boosting turn-on voltages of a second and a fourth switch of the motor driving unit, so as to effectively upgrade the heat dissipation ability of the first, second, third and fourth switches.