How to choose a good power adapter?

Industry news 2018/10/29 14:51:15 share to

With the increasing function of intelligent devices, its power consumption is also growing faster and faster. People are used to carrying portable charger or power adapter. For many people, the concept of power adapter only stays in the stage of charger, but in fact the power adapter is a transformer, is widely used in chargers. For those unfamiliar with power adapters, what kind of power adapter to charge is often faced with.

The parameters of the power adapter are varied, so it is not possible to use the adapter to charge. Before selecting the power adapter, three adaption conditions must be determined.

First, the interface of the adapter matches the device.

Second, the output voltage must be the same as the rated input voltage of the load (mobile device), or in the range of voltage that the load (mobile device) can withstand, otherwise, the load (mobile device) may be burned out;

Thirdly, the output current of the power adapter should be equal to or greater than the current of the load (mobile device) to provide sufficient power; the following three adapter conditions are analyzed.

Fourth, mismatched interfaces in the absence of professional knowledge must not be arbitrarily inserted, otherwise there will be dangers.

Fifth, for why the need for voltage consistency, from the principle of this is that the voltage is insufficient, not enough to drive the load, the battery can not be charged properly, the popular point is that supply exceeds demand.

Sixth, for why the need for such a current configuration, this involves the principle of the circuit, we all know that the power supply has internal resistance, the greater the loss of internal resistance. Therefore, the manufacturer in the production of this adapter, according to the size of the internal resistance, will determine the no-load output voltage within a certain range, and the voltage threshold corresponding to the current nominal value that we see, the greater the nominal value of the current that the adapter load capacity is better. So choosing an adapter with a slightly larger current will not only damage the battery, but will make the charging faster.

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