Hi, I am currently working on designing a circuit that will take measurements of a high voltage tractive system (583V) from an accumulator. On startup, there are two events that need to occur before the system reaches its nominal at 583V.
1. At 60V a comparator must switch a light on
2. At 525V a contactor must switch closed
I understand how to do everything with the exception of the voltage division. Ideally, it would be able to run two voltage divider circuits for each event but this yields a parallel resistance. I am wondering if there is any way I could run two voltage dividers on the same bus together or would I have to just be selective with my resistance values and run it off of one. I have been looking into voltage followers and how they can offer high input impedance in voltage divider circuits to be able to use the divided voltage without fluctuations due to low load impedance.
Also while on the topic of this parallel resistance issue, I am not sure what the actual tractive system resistance will be, and because I am taking a measurement of the battery voltage, I will technically be running this system in parallel with my voltage divider which then again will mess up the timing of the events. I am thinking I will just need to have one voltage divider with extremely high impedance to ensure that the tractive system is significantly smaller than the voltage divider. Some feedback on my thought process would be great!
1. At 60V a comparator must switch a light on
2. At 525V a contactor must switch closed
I understand how to do everything with the exception of the voltage division. Ideally, it would be able to run two voltage divider circuits for each event but this yields a parallel resistance. I am wondering if there is any way I could run two voltage dividers on the same bus together or would I have to just be selective with my resistance values and run it off of one. I have been looking into voltage followers and how they can offer high input impedance in voltage divider circuits to be able to use the divided voltage without fluctuations due to low load impedance.
Also while on the topic of this parallel resistance issue, I am not sure what the actual tractive system resistance will be, and because I am taking a measurement of the battery voltage, I will technically be running this system in parallel with my voltage divider which then again will mess up the timing of the events. I am thinking I will just need to have one voltage divider with extremely high impedance to ensure that the tractive system is significantly smaller than the voltage divider. Some feedback on my thought process would be great!