Searching for a Uninterruptible Power Supply to meet your needs can be quite a tireing task. A Personal or small business my need a UPS supply for a completely diefferent application than a large business or data center might need a Uninterruptible Power Supply for.
We hope to help you better make a choice on what sort of Uninterruptible Power Supply (UPS) you need. Then we can hopefully get you in touch with a distributor for that product to get you the best price for your ups system.
An uninterruptible Power System can be categorized in one of the following ways (also known as the UPS's Topology: Line interactive uninterruptible power system, Standy-by uninterruptible power system, True On-Line Dual conversion uninterruptible power system, or Flywheel uninterruptible power system.
The least expensive uninterruptible power system on the market is a standby UPS. A standby uninterruptible power system takes incoming AC power, charges it's batteries with an AC to DC charger, while providing AC power to the output (your equipment). If power is lost, power is "switched" to batteries, which generally takes 2-5ms. These units have no output regulation of voltage. So if your equipment is expecting 115volts AC, and for some reason you have a sag in power (say your dishwasher comes on) and the voltage drops down to 98volts AC, the UPS will pass that 98Volts right through to your equipment.
A little more expensive UPS would be a line-interactive UPS. A line interactive uninterruptible power supply works the same as a standby UPS. The main difference is that generally there is a buck-boost transformer that regulates the output voltage. In our example above, a line interactive uninterruptible power system would regulate that incoming 98volts AC to close to the 115volts AC that your equipment is expecting. When power is lost, there is a 2-5ms transfer time from when the UPS's batteries take over.
The most expensive (easily doubling the price of a standby) is the True On-Line Dual conversion UPS. The on-line ups takes incoming AC power, converts it to DC charging its batteries. It then takes that DC power and re-converts it to AC power. Using this method has many advantages. 1. Since the flow of power is AC-DC-AC, when you have a power outage, you simply take the first AC away, and the UPS is already supplying it's power from it's batteries (DC). 2. You can "trickle" charge your batteries, which is where the batteries are slowly charged. 3. Voltage regulation. You can finely tune your voltage on the output of your UPS, thus providing 115V (in our example) to your equipment all of the time.
There is one more uninterruptible power supply, which is fairly new to hit the market, a flywheel uninterruptible power system. A flywheel UPS acts in the exact same way as an on-line ups, except it has no batteries. If it has no batteries, then how does it provide backup you ask? Well the answer is in a giant flywheel, or spinning disc. The flywheel is constantly in motion by using the incoming AC power to drive it. When AC power is lost, the flywheel acts as a small generator, using its spinning inertia to provide DC power to a converter that converts the power to AC, hence providing backup to your load. The downside is that a flywheel ups will only provide seconds of backup.
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