The mystery of wireless charging: The exploration of electromagnetic induction and magnetic resonance With the rapid development of science and technology, wireless charging has gone deep into meIn our daily lives, from consumer electronics to industrial equipment, and even the automotive field, it is quietly changing our use experience. This article will delve into two mainstream wireless charging technologies: electromagnetic induction and magnetic resonance, to give you a deeper understanding of this convenient way to transfer power.
Now, let's explore the secrets of these two technologies! Electromagnetic induction technology is the first generation of mobile phone wireless charging representative, through the primary coil to transmit a certain frequency of alternating current, the use of electromagnetic induction in the secondary coil to generate current, wireless transmission of energy. However, this technology can only be achieved at present? What is not connected to the output? _ Baidu...
AP45851 compatible with high power output, chip compatible with Qi fast charge protocol (5/9/12V application), in line with the latest Wireless Charging Alliance (WPC) Qi version specifications. The AP45851 uses the unique CNS-chip as System technology to fully integrate a variety of high-performance mixed-signal functions, such as low-power device detection during standby and foreign object detection (FOD) for secure wireless charging.
Play the role of metal isolation, prevent energy waste, improve charging efficiency.
Wireless charger refers to the use of electromagnetic wave induction principle for charging equipment, the principle is similar to a transformer. There is a coil in the sending end and the receiving end. The sending end coil is connected to the wired power supply to generate an electromagnetic signal, and the receiving end coil senses the electromagnetic signal of the sending end to generate a current to charge the battery.
1, electric field coupling wireless charging Wireless charging coil chip , no coil for electromagnetic induction NoneWire charging coil chip , but directly through the capacitor formed between the charging base and the electrical device to be charged high frequency electric field wireless charging coil chip , that is, the use of the induction electric field generated by coupling two sets of asymmetric dipoles in the vertical direction to transmit power, this charging method has low cost, The advantage of low alignment requirements. But there are not many actual products.
2, the transmitting end is often multiple strands of silk-covered wire, multiple strands of thinner enameled wire or gauze wrapped wire wound inductors are used in relatively high frequency circuits, like the magnetic antenna rod coil of the radio, shortThe coil of the radio, the high-frequency transformer coil of the liquid crystal display lighting circuit, etc., often use multiple strands of wire and wind.
3, electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger transmission coil) will generate a magnetic field, other unenergized coil (mobile phone end of the coil) close to the magnetic field will generate current, charging for the mobile phone. The advantages of wireless charging safety: no power contact design, can avoid the danger of electric shock.
1, more commonThe SoC has IDT wireless charging coil chip , TI, COPO, purple light, etc. Most of the internal phones are currently using IDT receiving schemes. Texas Instruments TI receiver chip used more in the first two years, and now they have downplayed the wireless charging field wireless charging coil chip . The integration of this chip is high and the efficiency is high, but the cost of a single chip is high and some additional functions cannot be added.
2, the most used is Ti's chip, about 12 pieces. There are many ways to launchWe are one of them.
3, AP45851 is a charging IC applied to wireless charging and launching system, compatible with Qi protocol. The product is fully functional and highly integrated with all functional modules, providing excellent performance. The AP45851 is compatible with high power output, and the chip is compatible with the Qi fast charge protocol (5/9/12V application), which meets the latest Wireless Charging Alliance (WPC) Qi version specifications.
4, wireless charging PCB, different functions, the required components are different. The required components are: resistor, capacitor, resonant capacitor, resonant coil, MOS-tube, control chip, protocol chip.
5, so, when will we see such chips appear in smartphones? Well, that remains to be seen. Apple is rumored to be working with Energous on recent smartphones, but so far, no iPhone has featured Energous technology. Not only that, but the receiver inside the smartphone is only part of the equation; Users will also need to install charging stations around their homes, and businesses may want to do the same.
6, this circuit diagram with chip sl1052 as control, junctionIt is simple and functional. Pin function 1 Power end. 2 Temperature monitoring input. 3 Charging status indicator. 4 Grounding terminal. 5 Adjust the tube driver. With the base of the external regulating tube. 6 Charging control. 7 Current sampling input.