Preface
Many people have encountered such problems when using electric toothbrushes, razors, beauty devices and other daily small electrical appliances: when they find that the device is running low on power, they are busy washing in the morning, and they are worried that the water in their hands will invade the interface when plugging in the charging cable and cause damage to the device. In short, the design of the built-in charging port of low-power appliances is still not "convenient" enough.
However, at present, wireless charging technology has gradually penetrated into our daily life, and compared with mobile phones, wireless charging can show its unique advantages in small appliances such as electric toothbrushes, beauty instruments, and trendy toys. The convenience of wireless charging can help consumers get rid of the charging cable, but can easily place the appliance on the wireless charging dock, and then charge without worrying about water vapor intrusion, which greatly improves the overall experience of daily use of the product.
Built-in wireless charging solution for electric toothbrushes
When the charging head network sorted out the previous disassembly, it was found that there were many built-in wireless charging solutions for electric toothbrushes. Some of the parameters of the four chips that appear in the article are shown in the figure, and the editor will introduce them to you in detail below.
联智CWT500+CWR500
Lianzhi CWT500 is a highly integrated single-chip wireless charging transmitter IC that can provide 5W power. The chip supports USB and adapter inputs, and also integrates a MOS tube driver, which is compatible with QI protocols using ASK and FSK communication controllers. The chip includes a 32-bit ARM Cortex M0 processor in order to provide a high degree of programmability depending on its application. The communication and control unit (CCU) can be adapted to the WPC protocol, including the handling of fault conditions related to power transfer. The CCU supports foreign object detection (FOD) extensions. In addition, the chip includes over-temperature and over-voltage protection in a QFN40 package.
Lianzhi CWR500 is a wireless charging receiver chip, used for wireless charging and receiving, built-in rectifier tube, high circuit integration, fixed 5V output, in line with WPC 1.2.4 standard, integrated a synchronous rectifier, a low dropout voltage regulator and a communication controller using amplitude offset keying (ASK). The chip also supports multiple protection functions such as foreign object detection over-current protection, over-voltage protection, thermal shutdown, and under-voltage lockout (UVLO) and is available in a QFN40 package.
Application examples
A look at the future planck O1 electric toothbrush
The planck O1 electric toothbrush is the latest addition to evowera, available in black and white, including a brush handle and two brush heads. The handle body is designed with a bright surface, equipped with switches, function keys, and a smart display, which not only feels smooth and feels good, but also can switch brushing modes, timely reminders for missed brushes, and can also be connected to the evowera APP to set more intimate functions.
Related Reading:
Teardown report: A future adaptive sonic electric toothbrush planck O1
易冲CPS8510+CPS4510
The actual model of the chip of the silk screen 8510 is an easy-to-punch CPS8510. This is an ultra-simplified single-chip wireless charging transmitter chip, the chip integrates power full-bridge circuit, wireless charging main control and demodulation circuit, etc., using QFN2*3-12 package, supporting 5V input voltage, to meet the needs of low-power wireless charging.
Easy flush CPS4510 is a lithium battery charging chip at the receiving end of wireless charging input, the chip integrates wireless charging receiving circuit, linear lithium battery charger and battery protection circuit, the maximum output current is 0.5A, the charging current is adjustable, and supports battery over-discharge and over-current protection, the peripheral components are very simple, using TSOT23-8 package.
Application examples
HUAWEI Smart Sonic Toothbrush 2Pro
This electric toothbrush launched by Libode uses a large-capacity lithium battery and is equipped with wireless charging, which can be charged at any time and has a strong battery life. With OPPO's HeyTap Smart Home APP, it has a variety of brushing modes that can be set to bring a rich user experience and meet the needs of different consumers.
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Teardown report: Huawei Smart Sonic Toothbrush 2Pro
OPPO智美生活力博得智能声波牙刷S1
This electric toothbrush launched by Libode uses a large-capacity lithium battery and is equipped with wireless charging, which can be charged at any time and has a strong battery life. With OPPO's HeyTap Smart Home APP, it has a variety of brushing modes that can be set to bring a rich user experience and meet the needs of different consumers.
Related Reading:
Teardown report: OPPO Smart Life Libode Smart Sonic Toothbrush S1
Summary of the charging head network
The wide promotion of wireless charging technology has brought great convenience to the majority of users. People no longer need to worry about cumbersome charging cables, just gently place small appliances such as electric toothbrushes on the wireless charging dock, and they can get energy at any time, providing a more convenient experience for daily life.
Another advantage of wireless charging is that it significantly reduces the risk of damage caused by water vapor ingress into the device. Especially in humid environments such as bathrooms and washrooms, wireless charging technology provides users with great convenience and a sense of security. The two solutions of Lianzhi CWT500 + CWR500 and the easy-to-flush CPS8510 + CPS4510 mentioned in the article have injected new vitality into the development of wireless charging technology. These two solutions integrate a variety of circuits and functions of wireless charging, which not only simplifies the design of wireless charging transmitter and receiver, but also improves charging efficiency and safety, bringing more convenience to small appliances such as electric toothbrushes. At the same time, it also brings a more intelligent and comfortable experience to the user's life, so that technology can truly serve life.
Some of the information in the article comes from the Internet, and is affected by the timeliness of the case, please forgive me if there are any omissions.