wireless charger efficiency

rucelul

How much can wireless charger efficiency achieve, how fast is it charged, and whether there is radiation?   

talanyue

wireless charger efficiency
The charging efficiency generally refers to the overall efficiency of the receiver and the transmitter but does not include the efficiency of the adapter (the efficiency of the 5V adapter is generally around 90%).

The efficiency of wireless charging at this stage is usually around 70% (most of which is 65%~75%). There are some differences in the design of different chargers and transmitters.

If the transmitter and receiver are separately viewed, the efficiency of the general transmitter is about 80%, the receiver efficiency is about 90%, and the overall efficiency is around 70%. The efficiency here generally refers to the efficiency of providing current at about 500mA, which is also the case of maximum efficiency.

In fact, the efficiency of wireless charging is related to many factors, in addition to the main relationship with the wireless charger and the receiver, and the quality of the adapter has some relationship, and the load situation also has some relationship.

talanyue

Is the wireless charger charging fast and slow?

In fact, charging speed is not directly related to wireless charger and wired charger. The wireless charger can also be charged fast, and the wire charger is also slow.

The charging speed is determined by the size of the charging current that provides constant current charging. It is generally determined by the specifications of the wireless charger. Some wireless chargers provide a large current, and some wireless chargers provide small current.

In a certain range, wireless and cable are similar, but because there is a certain loss of efficiency in wireless, the current is too big to consider the problem of temperature rise. The charging current of mobile phone charger is generally less than 1A.

The general output current range of wireless charger is around 300mA~1000mA, and the maximum output is within 800mA.

If the charging current of 600mA is provided, the corresponding output power is about 3W, and the input power of the wireless charger is about 4.3W, which is the power within the 5W that we usually say, at about 70% of the efficiency. Adapters generally have to be above 5W, corresponding to 5V/1A.

talanyue

How big is the radio charger radiation?
The magnitude of radiation has not yet been quantified. We will also find a comparison of professional structural tests.

Just give you a concept roughly, radiation must have, but radiation is not big, do not worry.

It is mainly for several reasons:
1, mobile phone charging power is only about 5W, which belongs to small power.
2, the distance is short, only 10mm, less radiation around.
3, the transmitter and receiver end have magnetic isolation film, small radiation around; 4, the working frequency is low, the working frequency is 110K~205KHz, the radiation to the human body is small.