Abstract: A power tool includes a power connection terminal, a power system, a main control switch, and a power supply protection circuit. A power supply path is disposed between the power connection terminal and the power system. The main control switch and the power supply protection circuit are configured to control the power supply path to be completed or broken. During the use of the tool, the power tool is not restarted if the main control switch is turned on before an external power source that meets a power supply requirement is connected.

Abstract: A battery pack of a power tool includes a plurality of cells connected in series, a controller, which is configured to detect a charge current and/or a discharge current of the plurality of cells, estimate remaining capacity of the plurality of cells at least base on an integral of the charge current and/or the discharge current of the plurality of cells over time and generate or select a power supply capability parameter for limiting power of the power tool at least base on the remaining capacity of the plurality of cells, and a memory, which is configured to store data related to the remaining capacity of the plurality of cells.

Abstract: A power tool and a printed circuit board for use therewith. The power tool has an electric motor and a power source. The printed circuit board assembly has a main board having a conductive portion, a semiconductor power device, and a conductor attached to the conductive portion. The conductive portion electrically connects to the semiconductor power device and the conductor electrically connects to the conductive portion. When current is flowing through the printed circuit board, the heat and the voltage loss generated by the printed circuit board can be reduced.

Abstract: A blower has a fan, a motor, an air duct assembly having an air duct passage with an air inlet and an air outlet where the fan rotates to drive the airflow to enter into the air duct passage from the air inlet and to be exposed out of the air outlet, and an electrostatic neutralization apparatus. The electrostatic neutralization apparatus includes a first conductive end and a second conductive end wherein the first conductive end is located within the air duct passage and close to the fan and the second conductive end is also located within the air duct passage. The electrostatic neutralization apparatus of the blower effectively neutralizes electrostatic charges generated by the fan.

Abstract: A charging device for charging an electric energy storage device includes a power supply circuit connected to a power supply, an alternating current conversion circuit configured to convert a current from the power supply connected to the power supply circuit to a first alternating current with a preset frequency value, a transformer configured to convert the first alternating current to a second alternating current, wherein a voltage value corresponding to the second alternating current being less than a voltage value corresponding to the first alternating current, and a direct current voltage conversion circuit configured to convert the second alternating current to a direct current with a waveform fluctuating in a preset range, so as to charge an electric energy storage device.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A power tool includes an electric motor, a functional accessory capable of being driven by the electric motor, a detection device for detecting a rotational speed of the electric motor, and a controller for controlling the electric motor with a control signal. The control is operable to estimate a load parameter according to a duty cycle of the control signal and the rotational speed of the electric motor such that the electric motor is caused to be operated by the controller with a lower rotational speed under a lower load and a higher rotational speed under a higher load.

Abstract: A battery pack, a method for detecting the battery pack, a charging assembly, and an electric tool are provided for detecting voltage and disconnection of the battery cells. The battery pack may have an output voltage of at least 56V and may include a plurality of series connection units. A voltage detecting module may be utilized for detecting voltage in the battery pack. A battery control module configured to control voltage detecting module may also be employed. The method may involve determining whether the series connection units are disconnected based on rates of voltage change or internal-resistance of the series connection units.

Abstract: A power tool and a control circuit thereof by which electric energy can be recovered into a battery pack while an electric motor is braked. The control circuit includes a battery, the electric motor, an operation switch, a first control switch, a second control switch, a controller and an inductive element. The control circuit has a discharging state, a braking state and a charging state. In the charging state, the operation switch is in a second switched-on state, the first control switch is switched on, the second control switch is switched off, the battery, the inductive element, the operation switch, the electric motor and the first control switch form a charging circuit, and the electric motor charges the battery. The controller is electrically connected with the operation switch, the first control switch and the second control switch, respectively.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A power tool includes an electric motor, a functional accessory capable of being driven by the electric motor, a detection device for detecting a rotational speed of the electric motor, and a controller for controlling the electric motor with a control signal. The control is operable to estimate a load parameter according to a duty cycle of the control signal and the rotational speed of the electric motor such that the electric motor is caused to be operated by the controller with a lower rotational speed under a lower load and a higher rotational speed under a higher load.

Abstract: A power tool and a control circuit thereof by which electric energy can be recovered into a battery pack while an electric motor is braked. The control circuit includes a battery, the electric motor, an operation switch, a first control switch, a second control switch, a controller and an inductive element. The control circuit has a discharging state, a braking state and a charging state. In the charging state, the operation switch is in a second switched-on state, the first control switch is switched on, the second control switch is switched off, the battery, the inductive element, the operation switch, the electric motor and the first control switch form a charging circuit, and the electric motor charges the battery. The controller is electrically connected with the operation switch, the first control switch and the second control switch, respectively.

Abstract: A brushless motor includes a rotor, a plurality of sets of stator windings, a position detection assembly, a MOSFET assembly, an inductance detection module and a main control module that controls them. The position detection assembly has a plurality of detection elements for detecting a position of the rotor and a position detection module for receiving signals fed back from the detection elements with the position detection module being electrically connected to the main control module and feeding back the positional information of the rotor thereto. The main control module alternatively switches between the position detection assembly and the inductance detection module to detect the position of the rotor.

Abstract: An electrical combination with a battery pack and a power tool. The battery pack includes two battery pack connectors which are connected with the same electrode of a battery of the battery pack. A circuit of one battery pack connector has a resistance greater than that in another circuit of another battery pack connector. The power tool includes corresponding tool connectors. When the battery pack is connected with the power tool, the power tool is supplied with a small current by the battery pack firstly, and then is supplied with a large current, so an electric spark is eliminated when the terminals of the battery pack contact with the terminals of the power tool.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A power tool and a printed circuit board for use therewith. The power tool has an electric motor and a power source. The printed circuit board assembly has a main board having a conductive portion, a semiconductor power device, and a conductor attached to the conductive portion. The conductive portion electrically connects to the semiconductor power device and the conductor electrically connects to the conductive portion. When current is flowing through the printed circuit board, the heat and the voltage loss generated by the printed circuit board can be reduced.

Abstract: The present application provides a charging system having a charger and a battery. The charging system provides a quick-charging mode and a normal-charging mode. The quick-charging mode may be activated to charge the battery if certain conditions are met and the charging system may also have an indicating device for indicating when the quick-charging mode is finished. More specifically, the charger of the present application provides selective charging modes and provides an ultra-quick charging solution which may be controlled by the changes in the temperature of the battery and which can increase the charging power to quickly provide enough energy to finish a work task.

Abstract: A tool discharges one battery pack and a charger simultaneously charges another battery pack to provide for continuous and circular operation of the tool. Tool system includes a tool and a lithium based battery pack having a nominal voltage of at least 56 volts for supplying power to the tool. A heat absorbing device is associated with the battery pack and includes a phase-change material.

Abstract: A composite phase change material and the method for forming the material is disclosed herein. Thereof, especially a composite phase change material for lithium battery cooling, comprising polyethylene glycol, silica vehicle and composite flame retardant comprising graphite and polymer, wherein the weight ratio of the graphite and polymer is approximately 1:2. The composite phase change material according to the invention has a good stability and a thermal conductivity, a small corrosivity, a high phase transition enthalpy of 150-350 J/g, and a morphological stability during phase change. Moreover, addition of high thermal conductivity material and composite flame retardant ensures good thermal conductivity and excellent flame retardant effect of the phase change material.

Abstract: A brushless motor includes a rotor, a plurality of sets of stator windings, a position detection assembly, a MOSFET assembly, an inductance detection module and a main control module that controls them. The position detection assembly has a plurality of detection elements for detecting a position of the rotor and a position detection module for receiving signals fed back from the detection elements with the position detection module being electrically connected to the main control module and feeding back the positional information of the rotor thereto. The main control module alternatively switches between the position detection assembly and the inductance detection module to detect the position of the rotor.