Info!! Efficiency Calculations For Ability Converters

A ability converter’s efficiency (AC-DC or DC-DC) is determined yesteryear comparison its input ability to its output power. More precisely, the efficiency of the converter is calculated yesteryear dividing the output ability (Pout) yesteryear its input ability (Pin). The Greek symbol Eta “η” is commonly used to stand upwards for “Efficiency.” Here is the formula for determining a ability converter’s Efficiency (η).

η = Pout / Pin

For example, the efficiency of a converter that provides 500W of output ability (Pout) together with requires 625W for the input ability (Pin), would last 80% (500W/625W=0.80). In this case, the input ability exceeds the output ability yesteryear 125W or 20%, which is lost/wasted power. Therefore, 20% of the input ability is converted to oestrus unloose energy that must last removed from the converter yesteryear around way of cooling (conduction, convection, and/or radiation).

Since all ability converters convey inherent conversion losses, the output ability is ever less than the input power. Most often, the manufacturer of the ability converter specifies its efficiency together with maximum output ability on the product’s datasheet. When the efficiency (η) together with output ability (Pout) is known, the end-user tin terminate lift one's heed how much input ability (Pin) volition last required together with how much ability volition last wasted (Pwaste) together with converted to oestrus unloose energy nether amount charge conditions.



Here are the formulas to lift one's heed Pwaste together with Pin amongst sample calculations using the examples listed above.

Pwaste = (Pout/η) – Pout
Pwaste = (500W/0.80) – 500W = 625W - 500W = 125W

Pin = Pout + Pwaste
Pin = 500W + 125W = 625W

Obviously, amongst a higher efficiency converter, Pwaste is reduced. Using the instance above, only amongst an improved efficiency of 90% (instead of 80%), hither are the revised calculations:

Pwaste = (Pout/η) – Pout
Pwaste = (500W/0.90) – 500W = 555.5W - 500W = 55.5W

Per the examples above, yesteryear employing a to a greater extent than efficient ability converter it reduces Pwaste from 125W to 55.5W, which provides a substantial savings to the user inwards both electrical unloose energy together with cooling costs.

Here are alternate formulas for calculating the factors associated amongst ability converter efficiencies:

Pin = Pout/η
Pwaste = Pin – Pout
Pwaste = Pout (1/η - 1)

In around formulas, Pwaste is referred to equally Pd, where “Pd” way the ability dissipated (in the shape of heat) inside the ability converter. Pwaste = Pd.

When dealing amongst AC-DC ability supplies, non exclusively is “Efficiency” important, only then is the ability supply’s “Power Factor.” Information close the final result together with importance of the ability element inwards ability supplies is covered inwards the next article.

Power Factor Correction

/search/label/Power%20Factor%20Correction

More information close ability converter efficiencies together with cooling methods/techniques tin terminate last constitute at these spider web links:

Power Converter Efficiencies

/search?q=power-supply-losses-and-impact-of
http://us.tdk-lambda.com/lp/ftp/other/cost-savings-high-efficiency.pdf
http://us.tdk-lambda.com/lp/news/2012_release05.htm

Cooling Methods

/search?q=power-supply-losses-and-impact-of
http://us.tdk-lambda.com/lp/ftp/Other/cooling_bricks_ecn.pdf