|May 27, 2014|
12 volt power supply and DC UPS for use in cars, 5 amp with annunciation
Automotive battery backup system
Click here for the 3Amp DCDC UPS controller module
Click here for the 12 amp DC UPS controller.
Click here for the 24V 12A car UPS controller
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We have several models of the DC/DC UPS control module. This one works in 12 volt systems, has a throughput of 5 amps and has the ability to drive LEDs or relays to indicate the status of the UPS.
This is a microprocessor conrolled uninterruptible power supply control module. You can connect the module to the car's electrical bus and it will charge an external 12 volt lead acid battery of your choice. Your equipment, for example, a small computer, video recorder, or a car alarm, is connected to the module. This equipment runs off the automobile's electrical bus until the voltage from the car drops below a preset voltage, the "N" voltage (from 13.1 to 11.9 volts, depending on your needs). Then the external battery takes over. When the external battery drops below the "P" preset voltage (Between 10 volts and 3 volts depending on your requirements) the power is cut off to either prevent damage to the external battery or to run your equipment as long as possible.
These controllers can charge an auxiliary battery from the car's alternator system.
The auxiliary battery is isolated from the car's electrical system so that it will only operate the equipment attached to the load terminals of the controller.
The load terminals power your equipment from either the car or the auxiliary battery, acting as a battery backup (BBU). The switch positon depends on the voltage levels of the two inputs. This allows your equipment to be powered from the car when car power is available.
The DC UPS controller protects the auxiliary battery from being over-discharged.
The control set-points of the DC UPS controller can be set so that the equipment switches to auxiliary power when the car is shut off.
The setpoints can also be set so the the crossover voltage is lower, say 12.0 volts. This allows the load to run off the car's battery but cut off while the car's starting battery still has enough power to safely start the engine.
One of the most popular applications is to run a small auxiliary battery that kicks in while the car is starting to prevent equipment drop-outs when the car's voltage sags.
The PST-DC-UPS-1212 can be ordered with a range of "N" and "P" values, as explained in the following table.
The charge current depends on both the car voltage and the state of charge of the battery. When the car is running the blue curve applies.
Questions and Answers
1. Q:My application needs more pass-through current, what can I do?
A: We have developed a new module with power up to 120 watts. Click here for details .
2. Q: When the module turns off because both batteries are below their setpoints when does the module turn back on?
A: The module turns back on only when the car's voltage is restored to the proper charge voltage. A new auxiliary battery won't turn the module back on.
3. Q: What do you have for 24 volt systems?
A: Consider the 24 volt version of the 10 Amp backup module which will use 24 volt auxiliary batteries in a 24 volt vehicle.