1. I have to give reverse charger protection for battery management system in which N-channel mosfets are in ground path.
2. Attached is the ckt for bq40z50 in which N-channel are on +ve path i.e Q2 & Q3.
Battery is coonected across Bat+ & bat- & charger is connected across Pack+ & pack-.
In this circuit Q4 is for reverse charger connection protection. Suppose charger is connected in opposite direction then there is +ve voltage at gate of Q4 & ground at its source. It turns on the Q4 & it then it shorts gate & source of Q3, so protecting any current to flow.
3. Now i have a circuit in which n-channel are on ground path, I have to add reverse charger polarity in it also. Current Circuit without protection is attached with name actual
4. I have attached modified circuit. three components added are R1,Q4 & R2. Its P channel mpsfet. When charger is connected in correct configuration then gate at +ve & source at -ve, it turns off the mosfet Q4, but if reverse charger is connected then gate become negative & source become +ve, it turn on Q4 which in turn connect gate of Q2 & its source, effectively turn off the mosfet & save any current in/out of battery.
Query:
1. Is the modified circuit is ok?
Bat volatage in 1S configuration is 2.5V to 4.5V & charger voltage is +4.5V max
Bat volatage in 2S configuration is 5V to 9V & charger voltage is +9V max
2. Can Q4 mosfet be replaced by any n channel mosfet as in original circuit as I have 2n7002 in use.
Mod note:
You used the wrong file type, so it caused the file size is too big, now the file type all changed to the gif, it could reducing the file size from 5 times to 10 times, the png file type almost using in simple horizontal and vertical lines.
2. Attached is the ckt for bq40z50 in which N-channel are on +ve path i.e Q2 & Q3.
Battery is coonected across Bat+ & bat- & charger is connected across Pack+ & pack-.
In this circuit Q4 is for reverse charger connection protection. Suppose charger is connected in opposite direction then there is +ve voltage at gate of Q4 & ground at its source. It turns on the Q4 & it then it shorts gate & source of Q3, so protecting any current to flow.
3. Now i have a circuit in which n-channel are on ground path, I have to add reverse charger polarity in it also. Current Circuit without protection is attached with name actual
4. I have attached modified circuit. three components added are R1,Q4 & R2. Its P channel mpsfet. When charger is connected in correct configuration then gate at +ve & source at -ve, it turns off the mosfet Q4, but if reverse charger is connected then gate become negative & source become +ve, it turn on Q4 which in turn connect gate of Q2 & its source, effectively turn off the mosfet & save any current in/out of battery.
Query:
1. Is the modified circuit is ok?
Bat volatage in 1S configuration is 2.5V to 4.5V & charger voltage is +4.5V max
Bat volatage in 2S configuration is 5V to 9V & charger voltage is +9V max
2. Can Q4 mosfet be replaced by any n channel mosfet as in original circuit as I have 2n7002 in use.
Mod note:
You used the wrong file type, so it caused the file size is too big, now the file type all changed to the gif, it could reducing the file size from 5 times to 10 times, the png file type almost using in simple horizontal and vertical lines.
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