As one of the important selling points, the wireless charging function is Nokia Lumia 920 Won a lot of attention. The Nokia Lumia 920 uses Qi standard wireless charging technology, which conforms to the principle of electromagnetic induction. Unexpectedly, a foreign user has successfully charged the Lumia 920 with an induction cooker recently. Now let's take a look at the actual operation video.
After watching the video, in addition to a little sigh, many readers may ask why the induction cooker can charge Lumia 920? Here we can briefly introduce the wireless charging technology and the working principle of the induction cooker.
Currently, the industry is relatively mainstream Wireless charging technology There are mainly three types: electromagnetic induction type (using current to generate magnetic force through the coil to achieve short-range wireless power supply), radio wave receiving type (power is converted into radio wave short-range wireless power supply), magnetic resonance type (using magnetic resonance effects such as short-range wireless power supply). The above is basically realized by applying the principles of radio waves and electromagnetic induction in physics. Since radio wave is a kind of electromagnetic wave, it can transfer energy by itself, and can also penetrate the air, which makes wireless power transmission possible.
In the application of electromagnetic induction type, the well-known Qi standard adopts this principle. The Nokia Lumia 920 uses wireless charging technology that meets the Qi standard, which means that the Lumia 920 actually uses electromagnetic induction for charging. In addition, Nokia Lumia 820, Google Nexus 4, etc., all meet the Qi standard. They do not need to install any accessories. They can be charged directly on any charger that supports the Qi standard. At present, there are a large number of different types of wireless chargers available from Energizer, PowerMate and other brands on the market.
The specific principle of electromagnetic inductive wireless charging represented by the Nokia 920 phone is that there is a coil at the sending end and a coil at the receiving end. The coil at the sending end is connected to a wired power supply to generate an electromagnetic signal, and the coil at the receiving end senses the electromagnetic signal at the sending end to generate current to charge the battery.
Take a look at the induction cooker. The induction cooker uses the principle of electromagnetic induction heating; Electric energy is transformed into heat energy in the vessel through the change of magnetic field. There is a copper wire coil under the thermal insulation plate of the induction cooker furnace surface. The coil generates an AC magnetic field (the magnetic field with varying intensity), the frequency is generally 20kHz to 27kHz. When the AC magnetic field passes through the ferromagnetic metal utensils placed on the furnace surface, the energy is converted into heat energy in the utensils by the physical phenomenon of eddy current and hysteresis loss.
Obviously, both the Nokia 920 and the induction cooker apply the principle of electromagnetic induction to work, but the former is used for charging, and the latter is used for heating. Although there are differences, there are also similarities. What happened in the video actually happened before. Some BlackBerry users can use the same method to charge their BlackBerry phones. at present Love to play computer games The team has not yet tested whether this method is feasible. However, considering that the induction cooker will generate heat when heating metal, it is recommended that interested users should be more careful during the test. It is better not to put it on the induction cooker for too long, and it can be controlled within about ten seconds, otherwise the consequences will be unimaginable. After all, even if the Nokia 920 is durable, it can't afford the great mission of pan.
