bjornhropot wrote: I have designed a battery management circuit which takes in USB power, and uses this to charge a battery. The battery simultaneously is used to power the rest of the device. I am looking to know whether or not the circuit I have designed is functional. thank you.
https://obrazki.elektroda.pl/6427958100_1683839873.png https://obrazki.elektroda.pl/2001398400_1683839893.png
Hello!
Thank you for providing the schematics of your battery management circuit. I have reviewed the circuit and here are my observations and suggestions:
1. Input power source: Based on your description, you're using USB power to charge the battery. I see that you have a 5V input, but it's not clear if it's coming from a USB source. Please ensure that your input voltage source is compliant with USB specifications, which is typically 5V at 500mA for USB 2.0 or 5V at 900mA for USB 3.0.
2. Battery charging IC: I see that you are using the MCP73831T, which is a popular linear charge management controller for single-cell Li-Ion and Li-Polymer batteries. You have the correct connections for the IC, including the STAT pin for charge status indication.
3. Charging current setting: The charging current is set by the resistor R1, and the formula to calculate it is Iset = 1000V/R1. The value of R1 you have chosen is 2K, which corresponds to a charging current of 500mA. Make sure it matches your battery charging specifications and USB power source capability.
4. Battery connection and protection: I see that you have the battery connected to both the MCP73831T and the load. However, I do not see any protection mechanism for the battery, such as over-current, over-voltage, or short-circuit protection. You can achieve this by using a dedicated protection IC or adding additional components for these protections.
5. Load connection and power management: It seems like you are using a voltage regulator (U2) to supply power to your device. I assume it's a low dropout (LDO) or a buck converter. Please verify that it is suitable for your application, providing the required output voltage and current. You might also want to consider adding a power path management feature to your design, which allows seamless operation of the device when the USB power is connected, and the battery is charging.
6. Decoupling capacitors: I see that you have placed decoupling capacitors (C1, C2, C3) close to the ICs, which is good for noise filtering. However, please ensure that you are using the recommended values for these capacitors as per the datasheets of the ICs.
In summary, your circuit seems to be functional for charging a single-cell Li-Ion or Li-Polymer battery and powering the device at the same time. However, I suggest considering the above points to ensure the safe operation of your device and the battery.
If you have any questions, feel free to ask. Good luck with your project!
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