A surgical stapler. The surgical stapler includes a drive system, an electric motor, a battery and a control system. The drive system includes an actuation member. The electric motor is mechanically coupled to the drive system. The battery is electrically couplable to the electric motor. The control system includes an H-bridge circuit electrically couplable to the electric motor. The control system is configured to control the electric motor based on a sensed parameter associated with the electric motor, a position of the actuation member and a velocity of the actuation member.

A surgical stapler. The surgical stapler includes a drive system, an electric motor, a battery and a control system. The drive system includes an actuation member. The electric motor is mechanically coupled to the drive system. The battery is electrically couplable to the electric motor. The control system includes an H-bridge circuit electrically couplable to the electric motor. The control system is configured to control the electric motor based on a sensed parameter associated with the electric motor, a position of the actuation member and a velocity of the actuation member.

A direct current (DC) motor controller includes first and second electrode terminals, a motor switch and a control unit. The first and second electrode terminals are connected to a DC electric power source, and cooperatively conduct DC electric current therefrom to the DC motor. The motor switch has first and second terminals. The first terminal is connected to a DC motor. The second terminal is connected to the second electrode terminal. The motor switch is switchable between a first state and a second state. The control unit is connected between the first and second electrode terminals, and controls the motor switch to switch between the first and second states.

A direct current (DC) motor controller includes first and second electrode terminals, a motor switch and a control unit. The first and second electrode terminals are connected to a DC electric power source, and cooperatively conduct DC electric current therefrom to the DC motor. The motor switch has first and second terminals. The first terminal is connected to a DC motor. The second terminal is connected to the second electrode terminal. The motor switch is switchable between a first state and a second state. The control unit is connected between the first and second electrode terminals, and controls the motor switch to switch between the first and second states.

An electronic device includes a signal trigger circuit, a flat-motor drive circuit, and a flat motor. The signal trigger circuit sends a starting instruction to the flat-motor drive circuit for instructing to start the flat motor. A processor of the flat-motor drive circuit sends a first triggering instruction to a voltage processing circuit of the flat-motor drive circuit after receiving the starting instruction. The voltage processing circuit provides a first working voltage V1 to the flat motor after receiving the first triggering instruction, and provides a second working voltage V0 to the flat motor after a first time period. Where, V0<V1V2, V0 is a rated voltage value of the flat motor, and V2 is a maximum forward voltage value that the flat motor can bear when the flat motor is started.

An electronic device includes a signal trigger circuit, a flat-motor drive circuit, and a flat motor. The signal trigger circuit sends a starting instruction to the flat-motor drive circuit for instructing to start the flat motor. A processor of the flat-motor drive circuit sends a first triggering instruction to a voltage processing circuit of the flat-motor drive circuit after receiving the starting instruction. The voltage processing circuit provides a first working voltage V1 to the flat motor after receiving the first triggering instruction, and provides a second working voltage V0 to the flat motor after a first time period. Where, V0<V1V2, V0 is a rated voltage value of the flat motor, and V2 is a maximum forward voltage value that the flat motor can bear when the flat motor is started.

A direct current (DC) motor controller includes first and second electrode terminals, a motor switch and a control unit. The first and second electrode terminals are connected to a DC electric power source, and cooperatively conduct DC electric current therefrom to the DC motor. The motor switch has first and second terminals. The first terminal is connected to a DC motor. The second terminal is connected to the second electrode terminal. The motor switch is switchable between a first state and a second state. The control unit is connected between the first and second electrode terminals, and controls the motor switch to switch between the first and second states.

A direct current (DC) motor controller includes first and second electrode terminals, a motor switch and a control unit. The first and second electrode terminals are connected to a DC electric power source, and cooperatively conduct DC electric current therefrom to the DC motor. The motor switch has first and second terminals. The first terminal is connected to a DC motor. The second terminal is connected to the second electrode terminal. The motor switch is switchable between a first state and a second state. The control unit is connected between the first and second electrode terminals, and controls the motor switch to switch between the first and second states.

A motor drive apparatus includes a converter configured to convert AC power inputted by an AC power supply to DC power and to output the same to a DC link, a DC link capacitor provided for the DC link, an inverter configured to convert the DC power in the DC link to AC power for driving a motor and to output the AC power, a DC voltage detection unit configured to detect a value of DC voltage applied across the DC link capacitor, an AC voltage detection unit configured to detect a peak value of AC voltage on an AC input side of the converter, and a leakage current detection unit configured to detect a leakage current caused by driving the motor, based on the value of DC voltage detected by the DC voltage detection unit and the peak value of AC voltage detected by the AC voltage detection unit.

A motor drive apparatus includes a converter configured to convert AC power inputted by an AC power supply to DC power and to output the same to a DC link, a DC link capacitor provided for the DC link, an inverter configured to convert the DC power in the DC link to AC power for driving a motor and to output the AC power, a DC voltage detection unit configured to detect a value of DC voltage applied across the DC link capacitor, an AC voltage detection unit configured to detect a peak value of AC voltage on an AC input side of the converter, and a leakage current detection unit configured to detect a leakage current caused by driving the motor, based on the value of DC voltage detected by the DC voltage detection unit and the peak value of AC voltage detected by the AC voltage detection unit.