Dalian Dapinjia Group launched a wireless charging BLDC solution for electric toothbrushes based on Nuvoton products
Dalian Dapinjia Group launched a wireless charging BLDC solution for electric toothbrushes based on Nuvoton products
On May 6, 2022, Dalian General Holdings, a leading semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary Pinjia has launched a wireless charging + BLDC solution for electric toothbrushes based on Nuvoton's MS51FB9AE chip. .
As people pay more and more attention to oral hygiene, electric toothbrushes have won the favor of many consumers with their stronger cleaning ability. According to relevant studies, electric toothbrushes can remove 38% more plaque than traditional manual toothbrushes, and the slight vibration generated by its high-speed operation can also promote blood circulation in the oral cavity, which has unexpected effects on gum tissue. massage effect. Relying on the above characteristics, electric toothbrushes can bring users a better experience in all aspects. The electric toothbrush solution launched by Dalian Dapinjia based on Nuvoton products simplifies the wireless charging of electric toothbrushes and the design of the motor BLDC module, which greatly shortens the user's research and development time.
Nuvoton is an IC design company established in 2008, focusing on the research and development of microcontroller ICs, battery monitoring ICs, image sensing ICs, IoT application ICs, semiconductor components and other products. With flexible technology, advanced design capabilities and superb digital and analog integration capabilities, the company's products have a leading position in the industrial, automotive, communications, consumer electronics and computer markets.
This solution uses Nuvoton's MS51FB9AE microcontroller in the design of wireless power supply, and uses Nuvoton's proprietary wireless power supply protocol/communication module to make the solution compatible with Qi standard 5W, 7.5W/5W, 15W/5W three types, conversion The efficiency can reach 85%, and it has protection functions such as over-temperature, current limiting, and metal foreign object detection. With this advantage, this solution not only realizes wireless power supply, but also supports two-way information communication. UART data transmission is performed through the primary and secondary coils, and the communication rate can reach 2.4Kbps, which is very suitable for devices that need to communicate between airtight and isolated products.
In the design of BLDC motor, this scheme uses the NuMicro® MS51FB9AE main chip and NCT3605 gate driver to realize the closed-loop control of the brushless DC motor (Brushless DC, BLDC) system design. The principle of the motor control system is to generate three-phase (U, V, W) duty cycle signals to the gate driver through the 6-channel PWM function, and then control the MOS through the gate driver to drive the motor to rotate. During operation, the system will first use the ADC to sample the voltage of the variable resistor to determine the target speed, and then use the sensor inside the motor to feedback the Hall signal to calculate the actual speed, and feedback compensation through the closed-loop control. Therefore, even if the magnitude of the load changes, the target speed can be quickly repaired.
