Preface
In daily work, the most used is the screwdriver, the use of electric screwdrivers instead of manual screwdrivers, can greatly improve efficiency, and more labor-saving. The electric screwdriver with torque setting can stop the power output after the screw locking reaches the set torque, thus avoiding slippage.
According to the product positioning, the high-end products use brushless motors, while the low-end products use brushed motors. According to the different output power, it is also divided into single-string battery and multi-string battery. The following is a dismantling and summary article to understand the internal design of the power tools dismantled by the charging head network.
BOSCH BOSCH
Bosch YOUseries USB-C charging drill
Compared with the traditional 3-string lithium battery products, the toolbox is replaced by a storage bag, which is smaller in size, more refined in product, and greatly improves its appearance. The hand drill is switched to a single-section 21700 power supply, which supports 45A discharge, providing sufficient power to meet the needs of daily use. The battery is charged via USB-C, which is now very common, so it is easy to replenish the battery at any time.
Through the dismantling of the charging head network, it was found that the USB-C rechargeable battery pack of the electric drill uses Samsung 21700 battery, 4000mAh. The TI BQ24250 charging chip is used for battery charging, and the built-in accelerometer and ST microcontroller are used to indicate the battery level, which is very convenient to shake to check the battery level. The drill has a built-in brushless motor, and the built-in Infineon TLE9877QXA40 brushless motor driver is used for brushless motor drive.
For a tool, good materials ensure reliable use for a long time. Through excellent design, Bosch Small Gold Diamond continues to be of high quality, which can meet the needs of home decoration and maintenance operations in life, and facilitate life.
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HOTO小猴
Little Monkey USB-C Straight Handle Electric Screwdriver
The electric screwdriver is powered by a built-in motor, which rotates the handle of the screwdriver through a reduction gear, which plays the role of tightening and loosening the screws. This electric screwdriver launched by Little Monkey has a built-in lithium battery, is equipped with multiple bits, and is equipped with an aluminum alloy storage bucket, which is good in integrity and very beautiful.
Through dismantling, the charging head network learned that the little monkey electric screwdriver has a built-in 18650 battery to power the motor, and the built-in TP4056 charges 18650, and the 18650 battery comes from Jiuyi Lithium Energy, which is a power battery and supports 30A discharge current. And use Hongkang battery protection chip to provide overcharge, over-discharge and over-current protection for the battery, and use a non-standard MCU for the whole machine control. The design is simple, lightweight and easy to use.
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小猴12V USB-C冲击钻
Little Monkey Tool This impact drill has a built-in lithium battery, which gets rid of the shackles of wires. The percussion drill has a USB-C charging port, which can be charged with a mobile power bank or mobile phone charger, which is more convenient to use. With multi-level torque adjustment, the percussion drill can be used as an electric screwdriver, electric drill and percussion drill, and can be used in a wide range of applications.
Through dismantling, the charging head network learned that the little monkey 12V impact drill has three built-in lithium batteries to power the motor, the battery pack is equipped with a thermistor for temperature monitoring, and the built-in Huazhimei HM4042 will input the boost to charge the battery, and the battery protection chip China Resources Silicon, model PT6303. The percussion drill is a brushed motor, and the governor is from Gelahua Electric Appliances, which is used for motor steering and speed adjustment. The percussion drill has a compact design and small size, which is a good helper for keeping it at home.
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MIJIA Mijia
Mijia brushless smart household electric drill
Tools such as electric drills are inseparable from professionals, although ordinary people do not use them often, but they also have to prepare one for emergencies. Mijia's electric drill is made of PC+ABS high-strength engineering plastics, the body is integrally molded without screws, the shape is in line with ergonomic design, and the whole is very small and lightweight, not afraid of all kinds of small spaces, it can be said that the use experience is very good, and the general assembly problems can be solved. Using the popular USB-C port to take power, the general mobile phone charger can be charged by adding a cable, which is also very convenient.
The charging head network learned through dismantling that the input end of the electric drill is designed with a fuse, over-voltage/short circuit/over-temperature protection chip, which fully protects the charging safety, and uses Yingjixin IP2326 to charge the built-in battery pack, which is also thanks to the use of Yingjixin's IC, the electric drill is equipped with a USB-C port, and the user has a better charging experience.
IP2326 IC is one of the new products of Yingjixin's IP23XX series, in addition to IP2312, IP2315, IP2325, IP2365, IP2368 five models, to meet the multi-scenario application of lithium battery fast charging. It can be said that the launch of the new IP23XX series of Yingjixin has played a very positive role in promoting the popularization of USB-C ports for general power tools.
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WORX Vickers
Wicks small lithium battery mill
Vickers small lithium battery electric grinder is small in shape, comfortable to hold, designed for hand-carved and polishing, the included drill bit is quite rich, five speed adjustments, can be adjusted between 5000-28000 rpm, the design of the top light, convenient to observe the state of the workpiece at all times in use, the maximum output power is 64W, the built-in lithium battery with 8V1Ah capacity, can last about ten minutes, and the practicability is very good.
Through dismantling, the charging head network found that the inside of the electric grinder is mainly composed of three small plates, two strings of lithium batteries, a motor and a rotating shaft. The motherboard is equipped with a single-chip microcomputer for the whole machine control, and the interface and motor input are protected by fuses, which are detailed and the connecting wires are glued and reinforced.
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WOWSTICK
Wowstick 1fs电动螺丝刀
There are four powerful magnets around the two lids of the tool box, NS heteropole, and the lids are closed together by the magnetic attraction of these eight magnets. The lid with the pattern is the upper lid and the other is the lower lid. The lid is recessed in the middle, with a Wowstick 1fs in the middle and six precision screwdriver bits and extensions around it. The lower lid is placed with a magnet (hidden) under the bit groove to attach the bit assembly.
The Wowstick 1fs electric screwdriver has a delicate shape, a sturdy aluminum alloy shell structure, easy to operate, a self-locking mechanism, which can use two working modes of mobile phone and electric, a work lighting LED light, which is convenient for removing screws in a deep screw hole, a tool box and a bit assembly, easy to store and carry, and can reduce the labor intensity of disassembling precision screws. It is speculated that in order to prevent the precision screws from being screwed, the torque output of the screwdriver design is a little smaller.
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Summary of the charging head network
The above is a summary of the six power tools that have been disassembled by the charging head network, which are divided into two types: brushed motor and brushless motor according to the different built-in motors. In terms of batteries, except for one electric screwdriver, which is a replaceable No. 7 battery, the rest are powered by lithium batteries.
In recent years, the power tools powered by built-in lithium batteries have been introduced with USB-C interface to charge the battery, and the USB-C interface has good versatility and is very friendly to consumers.