Preface
The first thing that needs to be explained is that the hair dryer dismantled this time is a customized gift for Biyiwei, and the logo of Biyiwei is printed on the packaging box and the hair dryer body.
The bear high-speed hair dryer has a built-in 110,000 rpm three-phase high-speed brushless motor, with a strong blowing wind speed of up to 73m/s, the hair dryer has two wind speeds of low and high-grade, with four modes of cold air, hot air, constant temperature and cold and hot cycle, and the hair dryer supports 1000 times per second to detect the temperature to achieve intelligent temperature control.
This hair dryer also uses 10-fold noise reduction technology to effectively reduce the noise in use. The handle of the hair dryer is equipped with an anti-suction filter, which is safe and secure to use. The magnetic nozzle equipped with the hair dryer is a double-layer design, which is simple to install and the double-layer design is anti-scalding. The length of the power cord is about 1.7 meters, which is the mainstream length. Let's bring the disassembly of the bear high-speed hair dryer A2, and take a look at the internal design and materials.
Bear high-speed hair dryer A2 unboxing
The front of the hair dryer box is printed with the bear logo and the appearance of the hair dryer.
The back of the box is printed with the logo of Biyiwei.
Inside the package, there is a hair dryer and a magnetic nozzle.
A list of hair dryers, magnetic nozzles, and manuals.
吹风机侧面印有必易微logo。
A glance at the back of the magnetic nozzle and the air outlet of the hair dryer.
A glance at the tail of the hair dryer and the air outlet of the magnetic nozzle.
The grip is equipped with a power button and a gear slide key.
Under the grip is the air intake, with a long strip opening.
A list of air inlet lock logos.
Swivel to remove the air inlet housing, which is equipped with a stainless steel air intake filter.
Close-up of hair dryer housing parameters
Name: Hair dryer
Model: DCF-D16H1
Rated input voltage: 220V 50Hz
Rated power: 1600W
Manufacturer: Little Bear Electric Co., Ltd
The power cord is tied with a cable tie.
The measured length of the power cord is about 170cm.
The plug specification is 10A 250V~.
The weight of the hair dryer is measured to be about 355g.
Bear high-speed hair dryer A2 disassembly
After reading the appearance and test of this hair dryer, let's disassemble it and take a look at the internal design and materials together.
First, remove the filter at the end of the hair dryer handle and set the screws inside.
Unscrew the set screws and remove the stainless steel strainer.
The inside of the stainless steel filter screen is provided with the fixing screw of the handle housing.
Remove the power switch and button switch, and remove the handle housing.
The power cord is connected by soldering and insulated by a jacket of heat shrink tubing.
The handle is secured by a snap clip.
Open the handle, inside the handle there is a brushless motor and an air intake grille.
The side of the handle is sealed with white glue.
The connecting wires are sealed with white glue.
The tail of the fan is equipped with a plug-in connection wire, and the outer sleeve is suspended rubber sleeve for sealing and noise reduction.
Disconnect the wiring connector and remove the fan.
Close-up of brushless fan blades.
The brushless motor comes from Dongguan Chi Drive Motor Co., Ltd., which is a brushless DC motor with a model of BL2212.M0100. The input power is 110W, the output power is 55W, and the insulation class is Class F. The power supply voltage is DC 310V, and the speed is 110000r/min.
The tail of the motor is provided with a small wiring board.
The stator coil is fixed with a glue seal.
Remove the power switch and button plate from the handle.
Three transistors and connectors and a current-limiting resistor are soldered on the back of the button board.
小板正面焊接贴片按键和RGB LED。
The power switch is connected by welding.
The back cover of the hair dryer is secured by a snap clip.
The sliding power switch is connected by welding.
The slide power switch is from SIBER, model XN-14B, with a specification of 10A 250V.
Disassemble and remove the magnetic ring on the front end.
Remove the hair dryer movement from the back cover.
Close-up of the connecting wires of the movement.
A black plastic skeleton is provided between the PCBA module and the heating wire module.
The heating wire is connected to the PCBA module by wire welding.
The ionizer is also connected by wire welding.
The negative ion generator is from Xiang Alloy Electronics Co., Ltd., model XH-208B, with an input voltage of 100-240V and an output power of 1W.
Unscrew the fixing screws to remove the plastic cover of the air outlet.
The serpentine heating wire is fixed with a mica skeleton.
The bimetal protector and the thermal fuse are riveted to connect.
An NTC thermistor is installed at the air outlet to detect the air temperature.
Bimetal thermostats are used for overheating protection, cutting off power to the hair dryer in the event of overheating.
The thermal fuse from ARLIN operates at 157°C and is used to shut off power to the hair dryer in the event that both the thermistor and the bimetal thermostat fail, ensuring safety from overheating.
The front of the PCBA module is at a glance, on the left side is the AC input terminal, soldered chip fuse, NTC thermistor, safety X2 capacitor, varistor, common mode inductor, upper soldered step-down filter inductor, lower soldered thyristor and control optocoupler. A non-isolated step-down circuit is welded in the upper right, with a high-voltage filter capacitor in the middle and six motor drive tubes below.
The rectifier bridge, the main control MCU and three half-bridge drivers are soldered on the back.
The safety X2 capacitor specification is 0.47μF.
The other safety capacitor has the same specifications.
The input chip fuse is 3.15A.
The varistor is from HEL Hongzhi and is specified as 7D471K to absorb overvoltage surges.
NTC thermistor silkscreen 3D-9 for suppressing inrush current at power-up.
The common mode inductor is magnetically surrounded and reinforced with glue.
Close-up of chip filter inductor.
整流桥型号DB407S，规格为4A 1000V。
The high-voltage filter capacitor is from Fengbin and has a specification of 120μF 400V.
The non-isolated step-down chip used to power the MCU is from Biyi Micro, model KP3116, is a high-performance, low-cost offline PWM power switch, the chip integrates a 700V high-voltage MOS transistor and a high-voltage start-up circuit, the no-load power consumption is less than 100mW, the switching frequency is up to 40KHz, and the SOP-8 package is used.
Biyi Micro KP3116 Fact Sheet.
Close-up of 1mH buck inductor.
The output filter capacitor specification is 220μF 25V.
The 78L05 regulator chip is used to power the MCU.
主控芯片来自LNCHIP领芯微电子，型号LCM32F037K6T8，芯片内置32位ARM Cortex M0 MCU，主频为96MHz，芯片内置32KB FLASH和4KB RAM，内置三路轨对轨模拟比较器和运算放大器，采用LQFP32封装。
The half-bridge driver is from Biyi Micro, the model is KP85302, the chip withstand voltage is 650V, with 0.3A source current and 0.6A sink current capability, the chip is integrated with bootstrap pressing, with short propagation delay and delay matching, dual input and output interlock function, compatible with 3.3/5/15V input signal voltage range, and adopts SOP-8 package.
Biyi Micro KP85302 Profile Information.
用于电机驱动的MOS管来自HI-SEMICON深鸿盛，型号SFD5N50TS，NMOS，耐压500V，导阻1.5Ω，采用TO-252-2L封装。
深鸿盛 SFD5N50TS 资料信息。
The two thyristors used to control the heating wire are the BT138-600E and are available in a TO-252-2L package.
The optocoupler used to drive the thyristor is from Tiandian Optoelectronics, model TDM3052, and is available in SOP4 package.
Tiandian Optoelectronics TD214B optocoupler is used for zero-crossing detection.
A list of all dismantling and a family photo.
Electrical New Observation Dismantling Summary
Finally, a list of A2 core components of the bear high-speed hair dryer is attached for your convenience.
The bear high-speed hair dryer A2 has two wind speeds, low and high-end, with four air temperatures: cold air, hot air, constant temperature and hot and cold cycle, and eight blowing modes. Detect the temperature of the air outlet 1000 times per second and carry out intelligent temperature control. The hair dryer has a built-in 110,000-rpm high-speed brushless motor, and the air outlet is strong. The hair dryer comes with a magnetic double-layer nozzle, which is easy to install, and the handle air inlet is equipped with an anti-suction filter, which is safe to use.
Through dismantling, the new observation of electrical appliances learned that Xiaoxiong's hair dryer is all domestic chip solutions, using Lingxin Microelectronics LCM32F037K6T8 main control MCU with Biyi Micro KP85302 half-bridge driver, using six deep Hongsheng SFD5N50TS MOS tubes for motor drive, and using Biyi Micro KP3116 non-isolated step-down chip to power the MCU.
The heating wire module uses thyristor for heat control, and the serpentine heating wire is supported and insulated by mica sheet skeleton. The heating wire is equipped with an NTC thermistor to detect the temperature, and a bimetal thermostat is equipped for overheating and power-off, and a thermal fuse is equipped for overheating fuse to achieve power-off protection.