This solution is provided by JLCPCB & LCSC for the medical Respirator Ozone Sterilizer, using SWM220F6S7-65 as the main control chip, take advantage of the ozone generator module, small blower, and LED display to get a Respirator Ozone Sterilizer.
Step 1: Specification Parameter
The charging indicator with 5 LED lights for 5 power levels. When charging, the charging part is always on, and the uncharged part flashes. When fully charged, it will trickle the charging protector. When the product works, the voltage drops to 3.0v, the over-discharge protection will be triggered, and the product will not be started, so do not worry about the over-charge of the battery. it is recommended to conduct a charging operation to ensure battery life. When the battery is not used for a long time, recommend to charge and discharge the battery irregularly to keep the battery alive.
You can easily get these parts on LCSC
Step 2: Working Principle
It is mainly controlled by MCU to receive user button operation, and the ozone generator module and blower are controlled and managed, and the battery charging is managed, and the power is displayed.
The ozone generator module is responsible for recombining the oxygen ionization in the air into ozone through a certain frequency of the high-voltage signal, and blowing it out by the blower, and thoroughly sterilizing the ventilator pipeline through the catheter path.
Step 3: Module Design
The mature single-cell lithium-ion battery charging chip TP4056 has only 1A charging capacity and has no pressure on 2500mAH charging. The low precision added at the front end limits the chip power resistance, which can distribute the time when the charging chip is fully loaded and reduce the charging chip The temperature rise makes it better and faster to complete the charging.
You can change or modify this design file by EasyEDA
Step 4: Execution Circuit
N-MOS switch tube is used to drive power components in low-side driving mode. The power components are mainly composed of three parts, an ozone generating module, a blower, and a buzzer. Very low N-MOS on-resistance, which can better drive power components, reduce losses and improve conversion efficiency, and extend the time for a single charge of the battery.
Step 5: Indicating Circuit Indicating Circuit Using 7 LED lights, low cost and high-cost performance to achieve the working status and power display, more convenient for users to use.
You can get the PCB samples in JLCPCB by $2 within 2 days.
Step 6: MCU Schematic
Adopt SWC's SWM220F6S7-65 main control chip, which has 32K on-chip Flash, 16k SRAM, SSOP20 small package, high precision, and accurate control of the work of each component, ultra-low power design, making the entire circuit standby current only 1.5uA, Effectively extend the battery life. The SWM220 series is a 32-bit MCU embedded ARM® CortexTM-M0 core. With its outstanding performance and outstanding features such as high reliability, ultra-low power consumption, and multiple communication interfaces, it can be applied to instrumentation, household appliances, industrial control, motors Control, wearable devices, and other fields.