A power tool is provided including: an electric brushless direct current (BLDC) motor having a rotor and a stator. The stator includes at least six teeth including a first set of teeth on which a first set of stator windings are wound and a second set of teeth on which a second set of stator windings are wound. The first and second sets of stator windings are alternatingly arranged relative to the stator. The first set of stator windings is connected in a wye configuration and the second set of stator windings is connected in delta configuration.

A power tool is provided including: an electric brushless direct current (BLDC) motor having a rotor and a stator. The stator includes at least six teeth including a first set of teeth on which a first set of stator windings are wound and a second set of teeth on which a second set of stator windings are wound. The first and second sets of stator windings are alternatingly arranged relative to the stator. The first set of stator windings is connected in a wye configuration and the second set of stator windings is connected in delta configuration.

A structure for detecting feedback on a supply voltage when an electronic device supplies a power source to an external device connected to a connector and an operating method thereof are provided. The electronic device includes a power supply device, at least one connector for a connection with an external device, a power line wired between the power supply device and the connector, a feedback line brought into contact with the power line at a location adjacent to the connector between the power supply device and the connector, a voltage compensation circuit detecting feedback on a supply voltage supplied to an external device at the location adjacent to the connector using the feedback line, and a control circuit configured to control a compensation related to the supply voltage based on the detected feedback.

A power tool is provided including: an electric brushless direct current (BLDC) motor having rotor and a stator defining phases; a power unit including a first switch circuit connected electrically between a first power supply and the motor, and a second switch circuit connected electrically between a second power supply and the motor; and a controller configured to control a switching operation of the first switch circuit and the second switch circuit to regulate a supply of power from at least one of the first power supply and/or the second power supply to the motor.

A power tool is provided including: an electric brushless direct current (BLDC) motor having rotor and a stator defining phases; a power unit including a first switch circuit connected electrically between a first power supply and the motor, and a second switch circuit connected electrically between a second power supply and the motor; and a controller configured to control a switching operation of the first switch circuit and the second switch circuit to regulate a supply of power from at least one of the first power supply and/or the second power supply to the motor.

An input terminal connected to both a terminal of the first device outputting a signal including a period of a low voltage greater than or equal to a predetermined period and a terminal of the second device outputting a periodic signal alternately repeating a high voltage and a low voltage less than the predetermined period via one signal line is included. When a signal input to the input terminal includes a period of a low voltage greater than or equal to the predetermined period, it is determined that a signal output from the first device is input.

What is provided is a processing circuit capable of preventing a high voltage from being applied to a main circuit at the time of a sudden voltage change.

A processing circuit includes a differentiation circuit configured to output a differential value of a change in a target voltage, a predetermined voltage output unit configured to output a predetermined voltage when the differential value output from the differentiation circuit is equal to or greater than a predetermined value, and a predetermined processing executor configured to execute predetermined processing based on a voltage output from the predetermined voltage output unit on a protection circuit having a function of performing protection on the basis of a current detected by a current detector.

A power conversion apparatus for tracking maximum power point (MPP) includes: a signal processing circuit generating a first sensing signal at a sensing node; a first comparison circuit generating a first control signal according to a difference between the first sensing signal and a first reference voltage; and a second comparison circuit sensing a second sensing signal generated from the conversion circuit. The second comparison circuit generates a second control signal according to a difference between the second sensing signal and a reference signal. The signal processing circuit includes a bias sensing circuit and a clamp circuit. The bias sensing circuit adjusts the first sensing signal according to the second control signal, to adjust the first control signal. The conversion circuit adjusts a voltage and/or current of the output power according to the adjusted first control signal, so that a power retrieval source operates near its MPP.

A bootstrap circuit including: a charge pump; a power unit including a bootstrap capacitor, wherein the bootstrap capacitor is charged using an output voltage of the charge pump; and a switch driver for generating a bootstrap signal based on a clock signal and an analog signal, wherein the analog signal is input to an analog switch, the switch driver for controlling the analog switch using the bootstrap signal, and including a first body switch connected between an input terminal and a body of the analog switch.

A voltage compensation circuit and a voltage compensation method are provided. The voltage compensation circuit detects the load current provided by a power supply, generates a load voltage according to the load current, and compares the load voltage with at least one reference voltage to generate a switch control signal. The voltage compensation circuit further drives the at least one switch according to the switch control signal, provides a compensation resistance value according to the at least one switch that is turned on, and provides a compensation voltage to the power supply, so that the power supply provides a precise output voltage.