Hello,
I'm creating an array of 25 solenoids that are each actuated by an Arduino using a simple transistor setup. The solenoids draw 1.25A at 9V. I plan on having a maximum of 5 solenoids active at a time for no longer than 10ms, with about 25ms between actuation, minimum. Within that 10ms timeframe, the solenoids will theorietically draw 6.25A. The 9V wall adapters that I am looking for do not go up to thus current range, and the ones that do are extremely expensive and bulky.
I'm wanting to add a capacitor to the circuit that will act as a buffer, providing energy so that the sudden amperage increase is not 'felt' by the power adapter. To do this, I believe that I need to calculate how much energy the solenoids will consume in that timeframe, and find a capacitor that can store that amount of energy when placed across the voltage rails. The problem is, I can only find equations that show the energy across a resistor, not something like a set of solenoids.
The second part of the challenge is to determine if the capacitor can fully recharge in the time between actuation (an estimate would be 25ms).
This equation may be of use:
Vc = 1/C ∫ Ic*dt
I could solve for 'dt', but I do not know what time frame this would actually be specifying.
Thank you
I'm creating an array of 25 solenoids that are each actuated by an Arduino using a simple transistor setup. The solenoids draw 1.25A at 9V. I plan on having a maximum of 5 solenoids active at a time for no longer than 10ms, with about 25ms between actuation, minimum. Within that 10ms timeframe, the solenoids will theorietically draw 6.25A. The 9V wall adapters that I am looking for do not go up to thus current range, and the ones that do are extremely expensive and bulky.
I'm wanting to add a capacitor to the circuit that will act as a buffer, providing energy so that the sudden amperage increase is not 'felt' by the power adapter. To do this, I believe that I need to calculate how much energy the solenoids will consume in that timeframe, and find a capacitor that can store that amount of energy when placed across the voltage rails. The problem is, I can only find equations that show the energy across a resistor, not something like a set of solenoids.
The second part of the challenge is to determine if the capacitor can fully recharge in the time between actuation (an estimate would be 25ms).
This equation may be of use:
Vc = 1/C ∫ Ic*dt
I could solve for 'dt', but I do not know what time frame this would actually be specifying.
Thank you