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A wireless charging toothbrush solution with motor driven CST118S

    A wireless charging toothbrush solution with motor driven CST118S
     Nowadays, many families are already using electric toothbrushes, and electric toothbrushes are becoming increasingly accepted by consumers. Next, let's introduce electric toothbrushes. The electric toothbrush makes the brush head vibrate with high frequency through the rapid rotation or vibration of the motor core, instantly decomposes the toothpaste into fine foam, and deeply cleans the gap between teeth. At the same time, the vibration of the brush hair can promote the blood circulation in the mouth and massage the gum tissue.



    Nowadays, many families are already using electric toothbrushes, and electric toothbrushes are becoming increasingly accepted by consumers. Next, let's introduce electric toothbrushes.
    The electric toothbrush makes the brush head vibrate with high frequency through the rapid rotation or vibration of the motor core, instantly decomposes the toothpaste into fine foam, and deeply cleans the gap between teeth. At the same time, the vibration of the brush hair can promote the blood circulation in the mouth and massage the gum tissue.
    At present, the market mainly consists of sonic toothbrushes and ultrasonic toothbrushes; According to the power supply method, it can be divided into plug-in power supply and battery driven electric toothbrush.
    Now, let's recommend a wireless charging toothbrush solution. This plan consists of two parts: a charging dock and a handle.
1、 Charging dock section
    As a power input terminal, it can be separated from the handle.
    Charging power supply: DC/5.0V
    1、 Handle section
    It is the main part of an electric toothbrush.
    Lithium battery 3.7V/600mAh, one button, 3 white LED gears, 2 charging indicatorLEDs (red indicates charging; green indicates fully charged)
    1. Handle function
    A. The handle is turned off and there are no LED lights on the machine;
Press the key once to start the machine. When the gear is in the first mode, the LED1 white light will be on, and the machine will stop for 0.5 seconds every 30 seconds to remind the user to change the position. The machine will stop automatically without pressing the key for two minutes, and the LED1 will go out at the same time;
    B. Press the key twice, the gear is in the second mode, the LED 2 white light is on, the machine stops every 30 seconds for 0.5 seconds, reminds the user to change the position, and does not press the key in the middle. The machine automatically shuts down after 2 minutes, and the LED 2 goes out at the same time;
    C. Press the key for three times, the gear is in the third mode, the LED 3 white light is on, the machine stops for 0.5 seconds every 30 seconds, the machine shuts down automatically after three minutes without pressing the key in the middle, and  the LED 3 is off at the same time;
    D. Press the button 4 times to shut down
    E. If the key sequence is continuously pressed: shutdown - first gear - second gear - third gear shutdown - first gear Fourth gear -... loop.
    F. Press and hold the button for 1 second in any gear to turn off the device
    G. This machine has a memory function that automatically saves the last gear used.
    H. Low battery prompt: The 3.3V red light is on to indicate charging, and the 3.0V red light flashes 5 times before automatically shutting down

 2. Controller charging function
    A. When the controller is placed in the wireless charging dock for charging, the buttons on the controller are invalid (i.e. no function);
    B. When charging, the red LED on the handle flashes, indicating that it is charging; When fully charged, the green LED light stays on, indicating that the battery is fully charged; Attention: After fully charging the gear, remove the handle from the charging dock. The green light will turn off and the handle will be turned off.
3、 Principle implementation
    1. Charging dock
    Connect 5V DC power to directly power up the MCU, using Songhan's SN8F5701, which supports 5V direct power supply and eliminates the need for LDO voltage reduction. Two PWM controlled MOS switches in MCU are used to control the frequency of coil L1, thereby generating a magnetic field and electromotive force as the transmitting end of wireless charging.

2. Toothbrush handle
1) Power supply and control:
    The power end is a coil, which serves as the receiving end for wireless charging and can charge the battery. The battery can directly supply power to the MCU, and VDD comes with AD, which can achieve power monitoring. MCU controls key functions, LED indicators, charging control, motor control, power consumption control, etc., and is the core component of the entire system.
2) Battery protection:
     The IC uses Saixin Micro's XB5351/XB5352, which has all the protection functions required for battery applications (in fact, lithium protection chips can also be MX3510, MX3520C5, MX5320T5, MX3520E8, MX3520P8), including overcharge, overdischarge, overcurrent, and load short circuit protection. Accurate overcharge detection voltage ensures safety and full utilization of charging. During storage, low standby current will consume very little current from the battery.
3) Indicator lights:
    The corresponding functional status indicator can be selected as 0402/0603 and controlled by MCU software.
4) Key switch:
    Select a tactile switch as the medium for power on/off and gear control.
5) Motor drive:
    CST118S is selected, with a single channel DC motor driver and a single channel built-in power MOS full bridge driver. The maximum continuous output current of CST118S can reach 1.8A. CST118S is a commonly used model (supplied by Silicon Source Technology), and the motor can be selected from sonic, ultrasonic, or other motors.

 
4、 Design selection
    Please choose based on the actual situation. This article provides a reference BOM for self verification.。
充电底 座  牙刷手柄  牙刷手柄  
品名规格数量品名规格数量品名规格数量
DC座直流5V 输出1ICSN8F570213 SOP141电容100NF 06032
ICSN8F5701 SOP81ICCST118 SOP81电容10NF 06033
MOS管P5806NVG SOP81LEDLED write4电阻47K 06033
电容100nf 12061LEDLED RED1电阻100K 06032
电容10UF 10V 08051LEDLED GREEN1电阻2K 06031
电容10PF 06031按键KEY 5.2_5.2_2.01电阻3.3R 04021
电阻0R 06032电池3.7V1电阻100R 06035
电阻51R 04021电容22NF 12061电阻10K 06032
线圈2P_6MM1电容10UF 06032二极管K14 SOD1232
PCB 1锂保XB5352 SOT23-51三极管SS85501
   马达直流电机1三极管SS80501
   PCB 1线圈 1
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