larryg
Electrical
- Feb 23, 2001
- 25
I'm looking for a clever and simple way to current limit charge some super caps and also allow them to be available to provide pulse power. Let me explain further:
I'm providing 3.6V from a regulated output to a GSM/GPRS modem. During transmission, I need to suppply up to 2A peak for about 1.15 ms. My supply can only provide about 800 mA. To get around that,I'm using two supercaps in series (4.7F, 2.5V)to provide the pulse current. What I want to do is to trickle charge (50-100 mA)the caps while allowing the 3.6V rail to power up the other components(microcontroller,etc).Once charged, the caps need to be available to provide boost on the 3.6V rail to the modem. I don't have any type of control signal available to switch the caps in/out of the charging circuit. Am I making sense?
Any help would be appreciated. Thanks
I'm providing 3.6V from a regulated output to a GSM/GPRS modem. During transmission, I need to suppply up to 2A peak for about 1.15 ms. My supply can only provide about 800 mA. To get around that,I'm using two supercaps in series (4.7F, 2.5V)to provide the pulse current. What I want to do is to trickle charge (50-100 mA)the caps while allowing the 3.6V rail to power up the other components(microcontroller,etc).Once charged, the caps need to be available to provide boost on the 3.6V rail to the modem. I don't have any type of control signal available to switch the caps in/out of the charging circuit. Am I making sense?
Any help would be appreciated. Thanks