Specializing in Medical Grade
and Ultra High Reliability
Industrial ATX/SFX Power Supplies
RAM Ultra UPS 8000
Eliminate Data Loss During an AC Power Failure
Medical Grade Uninterruptible Power Supply
Typical UC circuits only utilize about 50% to 70% of the stored energy. RAM Technologies patented charge/ discharge technology utilizes over 90% of the stored energy. UC’s do not suffer any of the issues that rechargeable batteries do. If your application requires the absolute in reliability and longevity UC’s are the only solution.
Ultra Capacitors come in a variety of sizes generally ranging from 100F to 5,000F with terminal voltages ranging from 2.5 volts to 3.0 volts. One of the interesting features of capacitors is their energy is proportional to the square of the terminal voltage, small increases in terminal voltages yield large increases in stored energy. When the terminal voltage of UC’s reaches approximately 6 volts they will have the ability to store more energy than the best Lithium ion battery in a comparable volume.
SPECIFICATIONS (general):
Input Voltage range: 6V to 28VDC, 12V nominal
Input Current: Dependent on power supply source, 0A to 10A typical, adjustable.
Output Voltage: 12VDC to 28VDC, 12VDC nominal. Output current limited to 25A. The UPS needs a
Power Good signal asserted low (30ms min hold up) before loss of output.
Output Power: 0 to 300 Watts
UPS Capacity: Dependent on size of UC stack, typically 5000 Joules minimum. There is no limit on
Capacity other than physical size.
HOW TO SPECIFY STACK SIZE FOR YOUR APPLICATION (in Joules): Determine the load in Watts and back-up time in seconds. Multiply the load in watts by the time in seconds and the result will be in Watt/ seconds (one Watt/second= one Joule). The capacity of the UC will determine the number required. If a 400F 2.7V UC is used it has the energy of 1250 Joules.
Where: C capacitance in Farads and V in terminal voltage
Example: If the load is 50 watts and the desired back-up time is 300 seconds, the total energy (E) required is 15,000 Joules. Divide 15000 by 1250 and the result is 12. A quantity of 12 UC’s are required to power the above system for 300 seconds (5 minutes).
There is no limit as to how many UC’s can be stacked together.
Charge time is a function of capacity and the available power from the power supply. Unlike batteries UC’s have no limit as to how quickly they can be charged. Generally the limiting factor is the available energy from the host power supply.
Power Good Signal:
The UPS requires a PG signal from the host power supply in order to switch from charge to discharge mode. If no PG signal is available the UPS can be programmed to switch modes automatically sensing a drop in input voltage of 2 volts minimum with a 1 volt hysteresis.
Please contact us for technical assistance and a quote today!
