I have a few questions I would like to ask, which I do not get any direct answers for on the net.
1. It seems like the only thing that matters in the charging is the current and not the supply voltage. I am not talking about the delta effect now. Can you for instance put a 17VDC supply on a 9.6V battery pack and then limit the current via a resistor to C/10 or C/2 or whatever?
2.Now this current limiting resister is a bit of a dilemma to me. I have a transistor and a diode in my charging circuit so I took the supply voltage of the regulated power supply i.e. 17.2VDC and subtracted 1.4V for the transistor and the diode and used ohms law to restrict the current to 1100mA. Thus I had to use a 15.8/1.1 = 14.36 Ohm resistors, isn’t it? It seems not to be that simple because if I connect the battery and measure the current and volts across the battery I get a reading of 10.92 Volts and some current of 650mA or so? How does the battery affect the whole circuit and how do I determine the correct resistor value for the circuit? It seems like I have to use some other formula when the battery is connected into the circuit.
Your help would be greatly appreciated please.
1. It seems like the only thing that matters in the charging is the current and not the supply voltage. I am not talking about the delta effect now. Can you for instance put a 17VDC supply on a 9.6V battery pack and then limit the current via a resistor to C/10 or C/2 or whatever?
2.Now this current limiting resister is a bit of a dilemma to me. I have a transistor and a diode in my charging circuit so I took the supply voltage of the regulated power supply i.e. 17.2VDC and subtracted 1.4V for the transistor and the diode and used ohms law to restrict the current to 1100mA. Thus I had to use a 15.8/1.1 = 14.36 Ohm resistors, isn’t it? It seems not to be that simple because if I connect the battery and measure the current and volts across the battery I get a reading of 10.92 Volts and some current of 650mA or so? How does the battery affect the whole circuit and how do I determine the correct resistor value for the circuit? It seems like I have to use some other formula when the battery is connected into the circuit.
Your help would be greatly appreciated please.