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For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use the arduino ATMEGA328P microcontroller to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

____________________________________

Battery - Ansmann 7.4V, 2600 mAh. Datasheet here
Nominal charge 0.5C, max charge 1C, endpoint charge 0.01C.
Vmax 8.4V +/- 1% Temperature: Charge 0 - +45C, Discharge -20 - +60C, Storage -20 - +40C

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use the arduino ATMEGA328P microcontroller to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use the arduino ATMEGA328P microcontroller to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

____________________________________

Battery - Ansmann 7.4V, 2600 mAh. Datasheet here
Nominal charge 0.5C, max charge 1C, endpoint charge 0.01C.
Vmax 8.4V +/- 1% Temperature: Charge 0 - +45C, Discharge -20 - +60C, Storage -20 - +40C

5 added 245 characters in body
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For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use anthe arduino ATMEGA328P microcontroller to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use an arduino to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use the arduino ATMEGA328P microcontroller to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

4 added 245 characters in body
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For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use an arduino to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a circuit in place of the IC using parts lying around lab (Transistors, voltage regulators, op-amps etc.).

LiPo batteries require careful charging using a method called CC/CV (Constant current/ Constant voltage) where the battery first charges with a constant current and rising voltage to a specific point and then undergoes constant voltage charging where the voltage is kept constant and the current is changing until the battery is fully charged.

I am currently struggling with the design of this specific circuit in place of the IC to ensure the battery is not damaged, any advice would be greatly appreciated.

Update: My supervisor finally agreed to let me use an arduino to aid with the design. Therefore, am I correct in saying that I can make use of the ADC channels to measure the voltage of the battery and control the separate CC/CV accordingly?

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