Disconnect the mains power before opening! 8-32 ZONE DGP WITH 3A POWER SUPPLY General Installation Information 1. What Does it Do? The ATS1203/ATS1204 provides zone expansion with 8 to 32 zones to ATS Control Panels with a built-in Power Supply of max. Both the Mains Power Supply and the Battery are monitored. The DGP also provides for. This design for an external adapter lets you use the power supply without modifying it. Any ATX power supply can be plugged into the adapter. The result is a high capacity power supply that can output 3.3V, 5V, 12V and -12V. Before we begin, here is some background information on computer power supplies. Note: Wattages are estimates only. Actual power draw may differ from listed values.
There is a lot of confusion and many myths related to power supply(PSU) efficiency, first and foremost is not knowing what exactly efficiency means. In the context of computer power supplies efficiency refers to how well the power supply is able to convert the AC power it recieves from the wall into DC power it feeds to your components.
It is important to know how this actually applies to the amount of power that enters and leaves the power supply; a power supply rated at 500 W can deliver 500 W of power to the system regardless of its efficiency, the efficiency tells you how much power it must draw from the wall to deliver those 500 W it does not affect its output capacity, a 500 W power supply that is 90% efficient can deliever the same amount of power as one that is only 80% efficient. If the power supply is 80% efficient it needs 625 W(500/0.8) from the wall, those extra 125 W are turned into heat by the power supply, while a 90% efficient unit would only be drawing 555 W from the wall, meaning it is dissipating only 55 W as heat, or only 44% of the heat the 80% efficient unit was creating.Myth #1 is that using an oversized power supply will consume significantly more power at idle than a smaller unit since PSUs are less efficient at low loads and high loads, and are at their best between 40% load and 80% load. Even the Corsair 430CX which has no 80+ certification does not show a significant curve and it has efficiency that varies from 70% to 83%. Almost all power supplies you can buy today have a fairly flat efficiency curve, especially if they have any version of 80+ certification.There are still some units out there that have abysmal efficiency across the board. For example, the Cooler Master eXtreme Power Plus series which still seems to be common unfortunately. Hardware Secrets did a review of a couple of models from the series to show their efficiency across the board, and they too had a fairly flat line; however, it was pretty miserable efficiency and they never did break 80%.Moral of this story? Make sure you get a unit with at least 80+ basic certification, the ones without it can be anywhere from absymal to decent, and never great.Myth #2 is that the PFC(power factor correction) present in the power supply has an effect on its efficiency one way or another.There are two kinds of PFC, Active and Passive.
Active PFC uses electronics to accomplish its job more effectively than passive PFC which just uses a big coil, but being active it consumes some power which does hurt efficiency a tiny amount. However, active PFCs tend to boost the voltage inside the PSU up to a higher level than units with passive PFC do, which allows the rest of the power supply to run slightly more efficiently, so the effects pretty much cancel each other out. In this day and age, passive PFC units(ones with red voltage selector switches) should not be purchase, they are old designs and modern active PFC units can handle a much larger range of incoming voltages. Having Active PFC also reduces the load that the power company sees but that is a story for another day.Myth #3 is that 80+ was meant for individual consumers; while an 80+ rated unit is more efficient and will save you some money the long run it wasn't meant to save much money on the consumer level, it has much larger effects at the corporate and industrial level. If you are a company with small office machines that use 200 W under load and they are under load 8 hours a day, 5 days a week, 50 weeks a year they will consume a significant amount of power.
At 70% efficiency(the level most old PSUs are at) they will consume 285.7 W from the wall, at 82% efficiency(bronze) they will consume 243.9 W from the wall, and at 87%(gold) they will consume 222.2 W. For a single machine this doesn't seem like much, but for 1000 machines in an office that means we are talking about 444.4 MWh for the 80+ gold office, 487.8 MWh for the 80+ bronze office, and 571.4 MWh for the office using old power supplies, that is over a 100 MWh difference each year which obviously saves money for them on electric bills, but also reduces the load on their air conditioning system, and reduces the generating capacity needed at the power station so you have actually just saved that energy three times over. Great explaination.On active verse passive, Both can reduce effiency, But the acitive - more so than pasive.
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The Input Impeadeance to a PSU is primarily capacitive, the Coil simple counters this. The Loss is do to the DC resistance of the coil. As the old saying goes you can not get sometihng for Nothing, so a passive system does consume a small amount of power.
Both function to reduce the Power factor and thus reduce the Peak current. Reason power companies love a PF of 1 is that it reduces the IR losses over the Transmission lines, thus reducing the Power generation requirements.Ref PSU size, You hit the nail on the head for the average home user eff difference for most PSU may equate to a cup of java a month. On large PSUs, I still recommend You s limit the max size so that Idle power is at least 10%., Provided you can still stay below the 80% at max load.
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Reason for the 80% is more a longevity issue than cost savings. By design Very low power is hard on PWM circuits employed in Switching PSU. In fact the Initial Computer Power supplies would go up in smoke if Power output was zero (NO LOAD) - after a few years this was corrected (initially added resistor to provide a bias current - Then added a safty circuit to simply switch PSU off when No load is detected. May be wrong on this but when the duty cycle becomes close to zero current accually goes very high.
I was trying to avoid getting too technical as that also increase the likelihood someone can find a point to nitpick.