Types and advantages and disadvantages of wireless charging
With the rapid growth of the market for wireless charging technology, many customers are very concerned about wireless charging, and many guests are not aware of the principle of wireless charging, causing them to be very blind and entangled in the choice of product solutions. Zhuo core micro, as a provider of wireless charging program in the industry, has the responsibility and obligation to introduce the common types of wireless charging and its advantages and disadvantages to you, and hope to help you.
At present, there are three main types of wireless charging in the market.
The first Qi standard wireless charging is the magnetic induction technology wireless charging. The technology of wireless charging technology is to give the primary coil a certain frequency of alternating current, through the electromagnetic induction in the secondary coil to produce a certain current, thus transfer the energy from the transmission to the receiving end. This principle is similar to the principle of transformer used in power system. The primary side (primary coil) of the transformer is connected with alternating current. The secondary (secondary) side (secondary coil) will induce EMF due to the principle of electromagnetic induction. If the auxiliary side circuit is connected, the induction current can appear. In this way the electric energy can be realized from the transmitting coil to the receiving line. The wireless transmission of the circle. At present, the way of transmitting electric energy in this way has been widely used in the small power and short distance wireless charging market, such as electric toothbrush, mobile phone, camera and other portable electronic devices, which are usually recharged by the charging base. The power transmitting coil is installed in the charging base, and the receiving coil is installed in the electronic device.
The second is magnetic resonance wireless charging, that is, using resonant devices to achieve the same frequency at the transmitter and receiver, to achieve magnetic resonance, to meet the energy exchange. It needs to transmit and receive two resonance systems, which can be made of induction coils respectively. By adjusting the emission frequency to make the transmitter vibrate at a certain frequency, it produces not the ordinary electromagnetic waves everywhere, but a non radiative magnetic field, which converts the electric energy into a magnetic field, and forms an energy channel between the two coils. The natural frequency of the receiving terminal is the same as that of the transmitting terminal, resulting in resonance. With each resonance, there will be more voltage in the receiving terminal inductor. After multiple resonance, the surface of the sensor will gather enough energy, so the receiver receives energy in the non radiation magnetic field, thus completing the conversion of the magnetic energy to the electric energy and realizing the radio transmission of the electric energy.
The third is radio frequency technology, which is very attractive at home and abroad. This is probably the dream of wireless charging. We all know that electromagnetic waves can be used to transmit information, so in theory, as long as the frequency is high enough, it can also transmit energy. This wireless charging method may be the closest approach to people's imaginary wireless charging. An electromagnetic wave generator is installed at the power source, and the energy is transmitted to the receiving antenna through the transmitting antenna, and then the electromagnetic wave signals are returned into electrical energy for the use of the equipment. But this power transmission mode also has obvious weaknesses, such as electromagnetic wave interference, low transmission efficiency and radiation to human body.
The three techniques have their own advantages and disadvantages.
The first: magnetic induction technology, the advantages of high charging efficiency (mobile charging efficiency is more than 80%), the shortcoming is the short charge distance, the need to stick to the launch board charging, and charge when charging needs to be charged, representative manufacturers have apple, Samsung, NOKIA, SONY and so on.
The second, magnetic resonance technology, compared to magnetic induction technology, the charge distance is far (the conversion rate of mobile phone charging can reach 7cm), the charge area is large, and it can be filled with the charge. The disadvantage is that the charging efficiency is slightly lower, the maximum is about 70% at present, and the manufacturer has high pass, Witricity and so on.
The third is radio frequency technology. The biggest advantage mentioned above is that the charging distance is far away, but its disadvantages are also very obvious. One is radiation, the other is inefficient conversion.
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