ranking Sort Sort   |   date Sort Sort   |   member Sort Sort
Syndication

1
Date Submitted Wed. Jun. 12th, 2013 11:16 AM
Revision 1
Helper aussiegadget
Tags "DC-DC Power" | "laptop adapter"
Comments 0 comments
We choose DC-DC power supply, it is usually assessed many indicators, such as the output accuracy, source / load regulation, efficiency, etc., but there are several very important but easily overlooked indicators, including:

Dell Studio 1558 Laptop AC Adapter Replacement

1 Dynamic Load Output Capability: We usually use to measure the power load regulation output load capability, such as the output of the work load in half, or full-load conditions output performance. But the load regulation is the work load at a fixed current output performance under changing conditions, a static index, and the actual load current change is often, especially some of the current changes very fast, are dynamic indicators.

HP Mini 311 Laptop AC Adapter AU$30.99

2 Ripple rejection, DC-DC power supply is input to the ripple at the output ripple whether amplification or attenuation capacity usually want the power input of the output current ripple can not.
Power supply ripple noise indicators to assess the DC-DC power at the input completely pure condition, the output ripple and noise size. The source of regulation and load regulation similar assessment is output under static conditions change.

Satellite L500D-16L Laptop AC Adapter

3 best efficiency operating point range: DC-DC power conversion process, there will be consumed energy, which can not be 100% of the energy input to the output terminal. Usually want efficiency as high as possible, the general power will be given the highest conversion efficiency indicators, but whether this is true in the actual work efficiently to achieve it?
The answer is not necessarily, because it depends on your load operating point, and only in the load operating point (voltage and current) and DC-DC power supply nominal maximum efficiency can be achieved only when consistent with the maximum conversion efficiency.
As shown below, the DC-DC power conversion efficiency of 75.5% was the highest point, about the output current of 150mA (5V, power 0.75W) is reached, and in the range of 70mA to 500mA are higher than 70%.

Acer Aspire 5050 Laptop Charger Details
Specification:
Power: 65Watt
Input: 100-240V /50-60Hz
Output: 19V - 3.42A
Plug Tip Size: 5.5mm * 1.7mm
Special Features:
* Short-circuit protection
* low energy consumption
* Power Saving
* Overload Protection
* Over Temperature Protection