Tool/software:
Hi Team,
I hope you are doing well.
I am having difficulty estimating State of Charge (SOC) and State of Health (SOH) using the BQ76952. In my design, as shown in the block diagram, I can calculate SOC and SOH when the load is connected. However, I also have a parallel circuit that powers the host MCU and other components, which also draws power from the battery. The issue is that I don’t have a current sensor to measure the power consumed by this circuit.
Question 1:
Currently, I have a Hall effect sensor that measures the power consumed by the load and is connected to the BQ76952 [SRN, SRP]. However, this setup cannot accurately measure the low-current draw of the host circuit.
Additionally, I want to turn the MCU off and on as needed to save power, but this raises a concern: How can I maintain accuracy in SOC and SOH calculations if I am not measuring the power draw from the host MCU circuit?
The SOC and SOH algorithms will be running on the MCU, but since the MCU itself is consuming power, its draw is unaccounted for when it is turned off. Is there an optimal way to design the system to improve power efficiency while still ensuring accurate SOC and SOH estimation?
Question 2:
If I add a current sensor to measure this additional power draw, can it be integrated with the BQ76952?
I would appreciate any insights or recommendations.
Best regards,
Sai
