Share some questions about using BQ76930 and BQ78350[Copy link]
Question 1: The circuit board of the STM32F072C8T6 + BQ76930 + BQ78350 solution has been completed, and it is ready to connect the battery for testing and development. The function of the circuit board is that the microcontroller operates the BQ78350 through the SMSBus bus and converts it into a CAN bus to communicate with the power-consuming equipment. I am ready to start software development. What is the development process? Answer: If it is for the development of bq78350, it is best to use EV2400 to configure bq78350 and calibrate it first, export srec or dffs files, and use MCU for burning and configuration. Follow-up question: I just bought an EV2300, can this also be used? In addition, what are the main host computer software for development? Answer: It can be used. The software for the machine uses the battery management studio of BQ78350 http://www.ti.com/product/BQ78350-R1/toolssoftware Question: Another question, there are so many models of BQ76930, what is the difference?
I am using bq7693003DBT, the REGOUT output is 3.3V, and the working voltage of BQ78350-R1 is 2.5V, can these two be used together? Thank you~ Answer: You can choose bq76930001. The main difference is CRC check and output voltage, and the communication address will also be different. >>More Q&AQuestion 2: The current solution is BQ7830+BQ76930, which can work stably. Recently, I need to replace the original lithium battery cells with high-voltage lithium batteries. Do I need to make any changes? The current solution is BQ7830+BQ76930, which can work stably. Recently, I need to replace the original lithium battery cells with high-voltage lithium batteries. Do I need to make any changes? Answer: Please check whether your high voltage exceeds the maximum value of the parameters defined by our TRM. There should be changes in capacity. Design Capacity needs to be modified. It is recommended to re-learn. Question: The capacity has not changed, but the voltage has changed. Do I need to re-learn and update the CEDV model? Answer: If you change your battery, your CEDV parameters must be recalculated. >>More Questions and Answers
Question 3: bq76930 How to judge whether the charging voltage exceeds the maximum charging voltage. For example, the battery is 6S. The maximum charging voltage is 25.2V, but at this time it is connected to a 30V or even 50V power supply. How to set the parameters of bq76930 to identify the fault? TI expert reply: You can set OV overvoltage protection. When the cell voltage reaches the OV setting threshold, the protection will be activated. You can set OV overvoltage protection. When the cell voltage reaches the OV setting threshold, the protection will be activated. Question 4: BQ7694003 sampling battery voltage incorrectly Under normal circumstances, the sampled battery voltage is correct. For example, if the average value is 3.6V and there are 14 batteries in total, the sampled battery voltage value is about 3.6V, and the difference between each battery is not large. The program sets a balancing process with a threshold of 50mV. The principle is that two adjacent batteries in each group cannot be balanced at the same time. Find the maximum value. If the difference between the maximum value and the battery voltage is greater than 50mV, balance the battery. The general process is like this. The power consumption problem is not considered, but the problem now is that sometimes the voltage values of two or three adjacent batteries will be very different. For example, the 11th battery is 1V, the 12th battery is 2V, and the 13th battery is 7.8V. However, the actual battery voltage measured by a multimeter is normal, that is, around 3.6V. I don’t know what is the reason for this. Is it related to power consumption? The threshold is set to 50mV. Due to the poor consistency of the battery, more batteries may need to be balanced. However, through simulation, there is no phenomenon of simultaneous balancing of adjacent batteries. That is, there is no problem with the judgment and result of balancing, but there are more batteries to be balanced. Could it be that this problem causes excessive power consumption and burns the BQ769? The content balancing circuit is used. TI experts replied: 11 batteries are 1V, 12 batteries are 2V, and 13 batteries are 7.8V If the above situation occurs, you may need to check whether there is a contact problem between the battery cell and the board. Question: The connection is in good contact, so there is no problem. Now I don’t know what the reason is that BQ769 can’t work properly or even burn out. Under normal circumstances, the current program flow is correct, and the discharge and charge are correct. It’s just that BQ769 sometimes doesn’t work properly for some reason. It’s not clear what the problem is. The phenomenon is that the sampling voltage is incorrect, which leads to the undervoltage protection and overvoltage protection. The program is reset again. The same phenomenon occurs. Replace a new BQ769 and re-burn it. It can work correctly. After working for a period of time, the above error phenomenon usually occurs during simulation and power-on. Initialization is to open both CHG and DSG and open them at the same time. Is there a problem with this logic? There is also a problem with power consumption. Answer: BQ76940 itself has nothing to do with breakpoints. BQ76940 will maintain the state before the MCU enters the breakpoint. >>More Questions and Answers
qwqwqw2088 posted on 2018-9-25 10:33 Question 3: How to judge whether the bq76930 is connected to a charging voltage exceeding the maximum charging voltage. For example, the battery is 6S. The maximum charging voltage is 25.2V, but at this time it is connected to 3 ...
qwqwqw2088 posted on 2018-9-25 10:33 Question 3: How to judge whether the bq76930 is connected to a charging voltage exceeding the maximum charging voltage. For example, the battery is 6S. The maximum charging voltage is 25.2V, but at this time it is connected to 3 ...
What do the green, red and gray colors of this register mean?
提升卡
变色卡
千斤顶
京公网安备 11010802033920号
