Abstract: A wireless signal emitter of a tire pressure detector includes a controller, an antenna, and an impedance matching module. The impedance matching module includes an impedance matching circuit and an impedance adjusting circuit. The impedance matching circuit is electrically connected to the controller. The impedance adjusting circuit is electrically connected to the antenna and the impedance matching circuit. The impedance adjusting circuit includes a switching element electrically connected to the controller. When the switching element receives different signals of the controller, the impedance adjusting circuit switches between two different configurations, so that the impedance matching module has two different impedances, thereby the antenna sends two different radio frequency signals to achieve a purpose of a single tire pressure detector suitable for in-car receivers of different frequencies.

Abstract: A control method of an impact power tool includes: control a motor to rotate; continuously obtain a rotation speed signal based on a detecting result of a rotation speed detecting device and obtain a current signal based on a detecting result of a current detecting device; obtain a rotating time of each of rotation angles of the motor based on a variation of pulse waves of rotation speed signal and obtain the motor current based on the current signal; determine a number of impact that the impact mechanism produces based on a variation of the rotating time and a variation of the motor current; control the motor to stop rotating when the number of impact reaches a predetermined number. In this way, an output torque outputted by the impact power tool could be accurately controlled.

Abstract: A battery pack includes a fixing frame, at least one battery assembly, and a monitoring device for monitoring the at least one battery assembly, wherein the battery assembly is disposed on the fixing frame. The battery assembly includes a plurality of battery modules which are arranged along a predetermined axial direction. The monitoring device is disposed on the fixing frame, and is located on a side of the battery assembly in the predetermined axial direction. A minor axis of the monitoring device is located in the predetermined axial direction. In this way, the overall length of the battery pack can be reduced.

Abstract: A wireless programming method for tire pressure detectors includes the following steps. A wireless programmer sends an activating command. The tire pressure detectors send a responding message. The wireless programmer receives the responding messages and records identification codes in the received responding messages. The wireless programmer sends a stop-responding command to make the tire pressure detector with the identification codes, which is recorded in the wireless programmer, enter a stop-responding mode. The wireless programmer sends the activating command again. The tire pressure detectors not in the stop-responding mode send the responding messages. The wireless programmer receives the responding message and records the identification code in the received responding message. The wireless programmer sends a code to the tire pressure detectors corresponding to the recorded identification code to program the code.

Abstract: A brushless motor assembly includes a motor body, a circuit board, and a plurality of electronic elements. The circuit board is disposed on the motor body and has a first surface and a second surface which face opposite directions. The first surface faces the motor body. The second surface has a plurality of thermoconductive layouts. The electronic elements include a plurality of power switching elements disposed on the second surface. A plurality of heat sinks is disposed on the second surface. Each of the power switching elements and each of the heat sinks are connected to each of the thermoconductive layouts, so that a thermal energy generated by each of the power switching elements is transferred to each of the heat sinks through each of the thermoconductive layouts. This configuration thereby reduces an overall volume of the brushless motor assembly.

Abstract: A battery holder includes at least two connecting shafts, a first lateral frame, and a second lateral frame, wherein two juxtaposed battery assemblies are disposed between the first lateral frame and the second lateral frame. The at least two connecting shafts respectively pass through the corresponding battery modules, and is connected to the first lateral frame and the second lateral frame. The first lateral frame includes two adjacent side frames, each of which includes a first side bar and a second side bar which is opposite to the first side bar. The first side bar has a first perforation, and the second side bar has a second perforation, wherein a width of the first perforation is greater than a width of the second perforation. An engaging member passes through the first perforation and the second perforation, whereby to fix one of the side frames to another one.

Abstract: A brushless motor assembly includes a motor body, a circuit board, and a heat sink. The circuit board has a mounting surface and includes a motor control unit and a power switch which are disposed on the mounting surface. The motor control unit is adapted to control an operation of the power switch. The heat sink is disposed between the motor body and the circuit board, wherein the heat sink has a first side portion and a second side portion which are opposite to each other; the first side portion faces the motor body, and the second side portion faces the circuit board and shields the mounting surface of the circuit board. With the aforementioned design, it could effectively protect the electronic components on the circuit board and provide good heat dissipation effect.

Abstract: A distribution box includes a box body, a cover plate, and at least one guiding rail. The box body has several side plates and a base plate. An opening is formed by surrounding an end of each side plate. The base plate is connected to another end of each side plate. The cover plate is detachably engaged with the box body and closes the opening. The guiding rail is disposed inside the box body and has an open end facing toward the opening. At least one electrical accessory slides into the guiding rail from the open end and is engaged with the guiding rail. With the open end facing toward the opening, the electrical accessory could be easily disassembled and assembled without reserving an installation space at a position adjacent to the open end for providing other electrical accessories, which provides an effect of saving installation space.

Abstract: An electric power system for an electric bus includes a battery assembly, a leakage detection device, and a control device. The battery assembly includes a plurality of series-connected battery packs and a plurality of switch elements, wherein each of the battery packs includes a positive terminal, a negative terminal, and a battery cell module, and the battery packs include a first battery pack and a second battery pack; the positive terminal of the first battery pack and the negative terminal of the second battery pack are electrically connected to a load of the electric bus, and at least one of the positive terminal of the first battery pack and the negative terminal of the second battery pack is electrically connected to the leakage detection device, which outputs a leakage signal when a leakage is detected on an electric wire connected between the battery assembly and the load.

Abstract: A leakage detection device includes at least one optical coupler, a voltage divider, an analog-to-digital converter and a processing unit. Wherein, the at least one optical coupler is adapted to output an electrical signal according to a leakage degree of a DC power supply. The electrical signal is divided by the voltage divider to be output to the analog-to-digital converter and converted into a digital signal. The processing is adapted to compare a digital value corresponding to the digital signal with a reference value and output a leak signal when a difference between the digital value and the reference value is greater than a predetermined difference. A battery pack includes a battery cell assembly, a switch element, and a control unit, wherein the control unit controls the switch element to switch off an electrical connection between the battery cell assembly and the load to block electric power to the load.

Abstract: A battery pack includes a casing, a battery cell assembly, an encoder, and a monitoring unit; the battery cell assembly is disposed in the casing; the encoder is adapted to generate one of a plurality of types of encoding configurations, and includes an operating section which is adapted for a user to set one of the encoding configurations of the encoder manually; the monitoring unit is adapted to sense a state of the battery cell assembly and generate an identification code according to the encoding configuration of the encoder; wherein, the monitoring unit is further adapted to output a state signal which includes the aforementioned identification code. Whereby, the battery pack of the present invention would be a universal battery pack.

Abstract: A protective device of a power tool includes a fixing base having a tube portion and an abutting surface, a restricting ring fitting around the tube portion, several springs disposed between the abutting surface and a first end of the restricting ring, a protective cover having several second projections and several second recesses, and a locking member. The first end has an abutting portion. A second end of the restricting ring has several first projections and several first recesses matching with the second projections and the second recesses. The restricting ring is located between the protective cover and the abutting surface. When a blocking portion of the locking member moves to a first position, the blocking portion restricts the restricting ring from moving toward the abutting surface. When the blocking portion moves to a second position, the blocking portion leaves a position between the abutting surface and the abutting portion.

Abstract: An impact wrench includes a front housing and a motor. A transmission mechanism and an impact mechanism are disposed in the front housing. A transmission direction of a force outputted by the motor is changed via the transmission mechanism to drive a working member of the impact mechanism to rotate. A part of the working member is protruded and is exposed outside the front housing. The front housing includes a seat and a covering member which are detachably engaged. The detachable engagement between the seat and the covering member is convenient for a user to maintain an inside of the impact wrench.

Abstract: An insulating casing for battery terminals including a base and a top cover, wherein the base is engaged with a battery pack and includes a bottom plate. The bottom plate has a plurality of perforations adapted to be passed through by the terminals of the battery pack. The top cover is detachably engaged with the base, and a chamber communicating with the perforations is formed between the top cover and the base, and the terminals are received into the chamber whereby an insulating casing to protect the terminals of the battery pack is provided.

Abstract: A power tool includes a case, a motor, a plurality of Hall effect sensors, a first circuit board, and a second circuit board. The Hall effect sensors detect a position of a rotor of the motor and correspondingly generate position signals. A plurality of commutating switches and a first controller are disposed on the first circuit board. A second controller is disposed on the second circuit board, and could transmit a driving signal to the first controller according to the operating signal of an operator interface. The first controller regulates the commutating switches to commutate according to the driving signal and the position signals, thereby to activate the rotor to rotate. With such design, a commutation process and a user operating process are regulated by the two different controllers, which could efficiently simplify the program code installed in each of the controllers and facilitate the maintenance of the controllers.

Abstract: An electric power system and a management method thereof. The electric power system includes a plurality of battery packs and a battery management apparatus. Each of the battery packs includes a casing, a battery cell assembly disposed in the casing, an encoder, and a monitoring unit, wherein the encoder could generate one of a plurality of encoding configurations and has an operating section which is adapted to be manually set the encoding configuration by a user; the monitoring unit senses a state of the battery cell assembly and generates an identification code according to the encoding configuration of the encoder, and outputs a state signal including the identification code. The battery management apparatus receives the state signal of each of the monitoring unit and obtain the state of the corresponding battery cell assembly according to the identification code of the received state signal.

Abstract: A power tool includes a casing having a motor receiving portion and a holding portion, a motor disposed in the motor receiving portion, a transmission disposed in the motor receiving portion, and a fan module disposed in the motor receiving portion. The holding portion is adapted to be held by a user. The motor has a rotatable shaft, a front side, and a back side opposite to the front side. The transmission is located on the front side of the motor and is connected to the rotatable shaft, and has an output shaft for being connected to a tool bit. The fan module has a driving motor and a fan blade. The driving motor is adapted to drive the fan blade to rotate. With such design, the fan module could cool the motor to remove the heat generated by the motor.

Abstract: A battery pack includes a case and a plurality of batteries, wherein the case includes a first body, a second body, and a connecting frame. The first body has a first opening. The second body has a second opening which could match with the first opening. A chamber is formed between the first body and the second body. The connecting frame is connected to the second body, and has a first connecting shaft and a second connecting shaft. The first connecting shaft is adapted to be connected to the first body, and the second connecting shaft is adapted to be connected to a mounting position. The batteries are disposed side by side in the chamber.

Abstract: A brushless motor assembly includes a motor body, a circuit board, and a heat sink. The circuit board has a mounting surface and includes a motor control unit and a power switch which are disposed on the mounting surface. The motor control unit is adapted to control an operation of the power switch. The heat sink is disposed between the motor body and the circuit board, wherein the heat sink has a first side portion and a second side portion which are opposite to each other; the first side portion faces the motor body, and the second side portion faces the circuit board and shields the mounting surface of the circuit board. With the aforementioned design, it could effectively protect the electronic components on the circuit board and provide good heat dissipation effect.

Abstract: A leakage detection device includes at least one optical coupler, a voltage divider, an analog-to-digital converter and a processing unit. Wherein, the at least one optical coupler is adapted to output an electrical signal according to a leakage degree of a DC power supply. The electrical signal is divided by the voltage divider to be output to the analog-to-digital converter and converted into a digital signal. The processing is adapted to compare a digital value corresponding to the digital signal with a reference value and output a leak signal when a difference between the digital value and the reference value is greater than a predetermined difference. A battery pack includes a battery cell assembly, a switch element, and a control unit, wherein the control unit controls the switch element to switch off an electrical connection between the battery cell assembly and the load to block electric power to the load.