Abstract: An electric power tool includes a battery for outputting electric energy, and an operating device electrically connected to the battery for receiving the electric energy and adapted to operate based on the electric energy. The operating device includes a power module that is configured to output an operating power based on the electric energy; a driving module that is configured to drive a motor to operate based on the operating power; and a control module that is configured to, based on a capacity of the battery, control the driving module to adjust a proportion of the operating power sent from the power module to the motor in a manner that the proportion of the operating power is positively correlated to the capacity of the battery, and to terminate operation of the motor when the electric energy is less than a minimum operating voltage that is determined for the battery.

Abstract: A method of controlling a rotational speed of an electric tool is provided. The electric tool includes a battery, a battery voltage detection circuit, a motor unit, and a controller. The controller stores at least one regression equation of duty ratio on voltage, and detects a voltage of the battery through the battery voltage detection circuit. The controller obtains a duty ratio for a control signal by substituting the voltage of the battery into the at least one regression equation, and outputs the control signal with the duty ratio obtained from the at least one regression equation to the motor unit for controlling operation of the motor unit.

Abstract: A battery device includes a battery unit, a temperature port, a temperature sensitive component, a switch component and a battery management unit. The temperature sensitive component senses a temperature of the battery unit, and provides a temperature indication signal at the temperature port. The switch component is electrically connected to the temperature sensitive component. When the battery device operates abnormally, the battery management unit controls the switch component to make the switch component stop provision of the temperature indication signal at the temperature port.

Abstract: A method for controlling a nail-striking operation of an electric nail gun is proposed. The electric nail gun includes a control module and at least one switch. The at least one switch outputs a first switch signal that has a first voltage and a second switch signal that has a second voltage when triggered. The control module set a flag that corresponds to the at least one switch to a predetermined state upon determining that a striking condition is met. The striking condition includes that, for each of the at least one switch, the first switch signal has the first voltage and the second switch signal has the second voltage.

Abstract: A power tool and a safety control circuit module and a safety control method thereof are provided. The power tool includes a power supply device, a control processing device, a safety control circuit module, and a power output device. The control processing device is electrically connected with the power supply device. The safety control circuit module includes a first switch control circuit, a second switch control circuit, a third switch control circuit, a first resistor, and a first diode. The power output device includes a first power connection terminal and a second power connection terminal. Before switch units of the control circuits are controlled, the control processing device detects whether the switch unit has failed, so as to increase safety.

Abstract: Provided is a control system and method for a power-driven nail gun, which includes a battery, a motor, a flywheel rotating along with the motor, an impacting member receiving kinetic energy of the flywheel and a nail channel providing a channel for a nail to move along therewith when hit by the impacting member. The method includes utilizing a microcontroller to provide a pulse width modulation (PWM) signal for a driving circuit to drive the motor based on the PWM signal; and in response to reaching a target rotation speed by the motor, utilizing the microcontroller to output a corresponding PWM duty to the driving circuit based on the voltage of the battery, to make the motor maintain at the target rotation speed. The nails obtain stable and consistent kinetic energy and stability of nail firing is effectively improved.

Abstract: A battery device includes a battery unit, a temperature port, a temperature sensitive component, a switch component and a battery management unit. The temperature sensitive component senses a temperature of the battery unit, and provides a temperature indication signal at the temperature port. The switch component is electrically connected to the temperature sensitive component. When the battery device operates abnormally, the battery management unit controls the switch component to make the switch component stop provision of the temperature indication signal at the temperature port.

Abstract: Provided is a control system and method for a power-driven nail gun, which includes a battery, a motor, a flywheel rotating along with the motor, an impacting member receiving kinetic energy of the flywheel and a nail channel providing a channel for a nail to move along therewith when hit by the impacting member. The method includes utilizing a microcontroller to provide a pulse width modulation (PWM) signal for a driving circuit to drive the motor based on the PWM signal; and in response to reaching a target rotation speed by the motor, utilizing the microcontroller to output a corresponding PWM duty to the driving circuit based on the voltage of the battery, to make the motor maintain at the target rotation speed. The nails obtain stable and consistent kinetic energy and stability of nail firing is effectively improved.

Abstract: A method for controlling a nail-striking operation of an electric nail gun is proposed. The electric nail gun includes a control module and at least one switch. The at least one switch outputs a first switch signal that has a first voltage and a second switch signal that has a second voltage when triggered. The control module set a flag that corresponds to the at least one switch to a predetermined state upon determining that a striking condition is met. The striking condition includes that, for each of the at least one switch, the first switch signal has the first voltage and the second switch signal has the second voltage.

Abstract: A method for making a heat sink of a rectifier has the steps of producing a heat sink of a rectifier; defining blind holes in the heat sink; implanting diodes in the blind holes; and encapsulating the blind holes with insulating material. With such an arrangement, the heat sink of the rectifier is able to dissipate heat of the rectifier directly and effectively and the assembly procedure of the rectifier is simplified.

Abstract: A heat sink for a rectifier which has two heat sink plates, multiple blind holes defined in the beat sink plates. Multiple assembly diodes each corresponding to one of the blind holes and multiple metal plates each received in the bottom of one of the blind holes and under the bottom of the nail connector. After the metal plates, diode chips and the nail connectors are placed in the blind hole of the heat sink plate, an insulating plate is filled into the blind hole to secure the location of the nail connector and the metal plate, such that because the contraction coefficient of the diode chip during the cooling process increases, the water filtration and particle contamination are avoided. Furthermore, the heat dissipation efficient of the rectifier is increased as well.

Abstract: A heat sink for a rectifier comprises two heat sink plates, six nail connectors and six diodes. Six diodes are formed by with packaging six dice during the heat sink manufacturing process so that the six diodes are completely embedded into six holes. Therefore, the heat generated by rectifying AC power to DC power may be well distributed around the main body of the heat sink to avoid water infiltration and particle contamination. The attachment between diodes and heat sink may be enforced.