The Heavier of Laptop AC Adapter/Charger, the Better, Right?

Normally, most people always think that the performance of Laptop AC Adapter is highly related with its weight. When we purchase the AC adapter, we usually notice its weight, and view that the heavier one has enough power. Actually, if we have not the test instrument, it is indeed a very effective method. However, it is not right to judge it in that way. After all, it is not reasonable.

1. In terms of the consumer psychology, the laptop ac adapter manufacturers must improve the user's purchase value; that means to spend the least money, and get the better performance of the merchandise. Therefore, with the continuous technological innovations, manufacturers must further improve product integration with new materails and new design concepts to reduce the cost.

2. how the power adapter to achieve it with the above philosophy. First of all, EMI circuit, as the most important part of CCC test, is an important barrier for power adapter to reduce electromagnetic radiation. In the past, in order to meet the CCC requirements, EMI circuit usually set two levels to filter circuit with the common mode and differential mode. However, with the performance improvement of semiconductor, it can meet CCC requirement with only part of the circuit. Especially for the relatively low power supply, due to the light electromagnetic interference generated, normally we can see that an EMI has only one capacitor. Of course, the EMI circuit of high-power supply is relatively complex.

3. PFC circuit is also very important part. In the past, PFC generally used the metal skeleton, and now with the introduction of new materials such as ceramics and plastics. These two materials are not only good insulation properties, and less weight, but also reduces the noise generated by PFC.

And also, the widespread use of chip technology make some capacitors, resistors, diodes much smaller, which are all integrated into the PCB board on the back, so we can see that the internal structure of the power is much more neat than before, while the neat internal layout is more conducive to the formation of power and heat dissipation.

In short, there is a change and also unchanged, that is part of the device can not be changed, such as large capacitors, transformers, switching tube, rectifier tube, etc. In addition, different products have their different selling point. For example HP pavilion DV5 Ac adapter, in order to meet the low voltage, it use a large capacitor with 680 microfarads.