Nanjing Chervon Industry Co., Ltd.

Zhijian Lu

Hong Zhu

Qing Gao

Dezhong Yang

Yuexiang Zhang

Zheng Geng

Yingdian Xiang

Yafei Cao

Corey Berman

Zhengzheng Li

Yiwen Xiao

Jiajun Tong

He Huang

A power tool includes a motor including a rotor and multi-phase stator windings; a driver circuit having multiple switch elements for outputting switch signals to drive the motor to rotate; and a controller electrically connected to at least the driver circuit and the motor. The controller is configured to acquire rotor position information of the motor and adjust a resultant magnetic potential of the motor according to the rotor position information such that an output electrical parameter of the motor corresponding to the resultant magnetic potential is within a preset parameter range.

Power tool and control method therefor

A combination includes a battery pack and an adapter. The battery pack includes a battery pack interface at least capable of being detachably connected to a power tool. A first adapter includes a plug, an alternating current input interface, an alternating current-direct current conversion circuit, and a direct current output interface. A second adapter is capable of being electrically connected to the first adapter and the battery pack. The second adapter includes an adapter interface, a direct current interface, a voltage conversion circuit, and a two-way control module. The direct current interface is configured to be detachably electrically connected to the direct current output interface. The voltage conversion circuit is connected in series between the direct current interface and the adapter interface. The two-way control module is connected between the direct current interface and the adapter interface and connected to the voltage conversion circuit.

Battery pack and an adapter with a voltage conversion circuit

A power supply device and a booster circuit for a power supply device. The booster circuit includes an access terminal configured to access a direct current voltage from a battery pack, a transformer group electrically connected to the access terminal so that the accessed direct current voltage is boosted to a predetermined voltage by the transformer group, and a rectifier bridge electrically connected to the transformer group to convert the predetermined voltage into a high-voltage direct current after pulse rectification. The transformer group includes a first transformer including a first primary side and a first secondary side and a second transformer including a second primary side and a second secondary side. The power supply device disclosed is compact in structure and convenient to carry and can output an alternating current.

Power supply device

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. The alternating current conversion circuit is connected to the power supply circuit, the transformer is connected to the alternating current conversion circuit, and the direct current voltage conversion circuit is connected to the transformer.

Charging device and charging method

Growing community of inventors

Nanjing, China

Zhijian Lu