Magnetic fields and inductors are involved in the charging process. A pure resistance circuit refers to a circuit that contains only one resistor, while the circuit of a wireless charger contains an inductor coil, which is a necessary element to generate a magnetic field. Wireless charging through magnetic field induction, wireless charger is not a pure resistance circuit.
Because when the battery is full, the control chip in the mobile phone will disconnect the battery from the charger, this time the mobile phone itself is powered by the charger, the battery does not discharge, naturally will not consume the service life. But if you keep charging your phoneIt will cause the fuselage to heat up, and if you play games and shoot videos at this time, it is easy to cause the internal temperature to be too high, and the high temperature will also affect the battery life.
The constant current source mechanism is composed of Q2 and its base divider resistor and ZD2. When loaded into the recharged battery, the 15V voltage passes through R6 current limiting, and the C-E pole of Q2 charges the battery at constant current. At this time, Ul (Ul is a soft package IC model unknown) is in parallel with R6. The voltage drop at both ends of the R6 makes the ① pin potential higher than the ③ pin, and the ② foot outputs about two negative pulses per second. Make LED2 (CH charging indicator) flash frequentlyOn: Charging is normal.
1, What are the components of wireless charging? The left side is TX, that is, the transmitter, and the corresponding product is the wireless charging transmitter. On the right is Rx, that is, the receiving end, and the corresponding product is a mobile phone with wireless charging function. TX end: MCU, power full bridge, and LC resonant Tank composed of inductors and capacitors, where the inductor is the transmitting end coil.
2, this circuit diagram with chip sl1052 as a control, simple structure, complete functions. 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. The charging current is determined by the voltage difference between the power supply and this pin.
3, mobile phone wireless charging system mainly uses the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. When the system works, the input end converts the AC mains into direct current through the full bridge rectifier circuit, or uses the 24V direct current end to the systemPower on. Wireless charging technology is a special way of power supply, it does not need the power line, rely on electromagnetic wave propagation, and then the electromagnetic wave energy into electricity, and finally achieve wireless charging.
4, wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, wireless charging of mobile phones mostly uses the principle of electromagnetic induction. Electromagnetic induction wireless charging, when the current of the power supply through the coil (wireless charger's power supply coil) will generate a magnetic field, other unenergized coil (mobile phone side of the electric coil) close to the magnetic field will generate current, charging the mobile phone.
5, mobile phone wireless charging is a relatively novel charging method, the principle is actually very simple, is to separate the ordinary transformer primary and secondary levels to achieve the purpose of wireless. Of course, the working level of wireless charging is relatively high, and even the role of energy transfer can be achieved between the iron core and the direct coil can be abandoned. Drawings to there are a lot, but will not send pictures, to tell you about the simplest wireless charging.Millet 55W vertical air-cooled wireless charging using PC flame retardant material plastic shell, fuselage edge clear end Angle arc transition, support board is black, base sandblasting treatment is gold. From the front, the front end of the base is equipped with LED indicators, and the support board is layered above and below, using different designs. Indicator light is green when working.
Millet vertical air cooled wireless charger price is 199 yuan, millet car wireless fast charge price is 139 yuan. Recently, Xiaomi's 5G era charging technology media communication conference held in Beijing can be said to be brilliant, high-profile display of the world's first 30W super wireless flash charging technologyAnd in the follow-up millet 9PRO conference also released related accessories products, 199 yuan vertical air cooled wireless charging seat, is still very worth starting.
In general, the Xiaomi 100W wireless charger and the previously disassembled 80W wireless charger appearance, details, size are the same, only the difference in color, may be the beginning of the design is also to help consumers through the difference in color. A glance at the back of the two wireless chargers. The net weight of the entire wireless charging base is about 205g. Wireless charging supports free charging of mobile phones horizontally and vertically, taking Xiaomi 11 mobile phones as an example, you can vertically put noLine charging simultaneously processes information.
2, the working principle of PD decoy chip can be likened to an intelligent "communication master". Other setThe meter is able to simulate the interface of a specific power management unit, and interacts with the charger through the built-in communication module, just like the host at a banquet guides the guests, through the precise signal transmission, so that the charger recognizes and provides the voltage and current required by the device.
3, as shown in the figure above XSP01 PD by the electrical end (or decoy) chip used in the circuit, can support PD QC fast charge, chip cancelled, can support QC fast charge, no impact on the original wireless charging scheme circuit, this is unique, convenient and flexible use.
4. By design, the XSP08 is smartWhen the product requires 12V but the charger provides a maximum 9V (such as the iPhone 20W charger), it can automatically downshift to 9V without user intervention. In addition, the chip has a variety of built-in fast charge protocols, such as PD0/0, Huawei FCP/SCP, QC0/0 and Samsung AFC, which can automatically identify and use the protocol connected to the charger for efficient communication, improving the use experience.
5, the internal protocol chip, so in order to let the charger output fast charging voltage, such as 5V/9V/12V/15V/20V, you need to add an XSP06 power on the product