1, you are normal no-load voltage and low load voltage. The no-load voltage is normal, indicating that your wireless charging transceiver circuit is normal, but the voltage is pulled down after the load, the most likely is that your coil matching is not good, resulting in insufficient power received by the output end, so the charging voltage will be pulled down.
2, wireless charging technology is the use of electromagnetic induction principle, in the sending and receiving end with the corresponding coil to send and receive the induced current to charge.
3, this seems to be a problem, that is, the filling problem. However, the output end of the wireless charging receiving module is generally through bridge rectification, and the reverse charge is not charged, but the working frequency of the wireless charging transmitting module is higher, and the received charging power signal will still be short-circuited by the high frequency of the charging head. The solution is to add a high-frequency diode to the output of the wireless charging receiving module for isolation.
4, 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. The right side is Rx, that is, the receiving end, and the corresponding product is with noPlan. Indicator light is green when working.
Mi 55W vertical air-cooled wireless charger is equipped with a special bracket, can be directly installed on the base, and is embedded, especially stable! It can be removed at any time when not in use, because it is specially configured for the Mi 10 Ultra, and it is generally not used.
Mi 9 Pro supports 55W vertical air-cooled wireless fast charging, but there will be no fan rotation during the charging process. This is normal, because during fast charging, the phone will emit some heat, but it is not too high, so it does not need a fan to turn to dissipate heat.
Millet vertical air-cooled wireless charger (55W black) 199 yuan at present millet maximum power (charging speed is the fastest) wireless charger, if the phone is 30W or 33W wireless charging power, then it is recommended that you "redundant" to buy this power of the wireless charger, because the mobile phone upgrade faster, The wireless charger this product can be used for several years, and the new mobile phone can also achieve power coverage in the future.
Millet 5G era charging technology hit a new high, millet 9 Pro 5G version will be the first to carry 30W super wireless flash charge, this chargeThe electric speed is much faster than the wireless charging and decoding circuit the traditional wired charging. Xiaomi launched a vertical air-cooled wireless charging 30W accessories at this conference, its maximum power up to 30W, strong compatibility, the use of Qi charging standard, for the user's wireless charging experience has brought a new leap.
Electromagnetic induction type primary coil mustThe frequency of the AC wireless charging and decoding circuit generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
One of the self-wound coil is connected to the charging circuit, 555 output pin (third pin) is connected to an output tube (oneself free wireless charging and decoding circuit , but to the high-frequency power tube) the output tube is linked to the self-wound coil, The connected two coils are close to each other (about 1 cm or so there is a very sufficient charging current) and the power supply can be wireless charged! The efficiency of this circuit is very low, because there is only half a wave peak high frequency so the loss is relatively large, but the principle is quite simple and easy to produce.
The so-called wireless charging technology only uses the electromagnetic wave induction principle and the related AC induction technology, and uses the corresponding coil to send and receive the induced AC signal at the sending and receiving end to charge. Nothing high-tech, just magnetic fields! The charger has a coil, the battery has a coil, and when you put it close, it forms something like a transformer. But it's very inefficient, and it's very radioactive.
Principle Wireless charging and decoding circuit : the DC-DC switching power supply is divided into two parts at the high-frequency transformer, and the resonant coupling wireless charging and decoding circuit is adopted; Then use RFID technology for data communication and current feedback. In a single-phase bridge rectifier circuit, if there is a filter capacitor, when the load is open, the output voltage (that is, the voltage at both ends of the capacitor) is the peak of the AC input voltage, that is, U output =414*U input, that is, the input voltage of the root 2 times.
What are the components of wireless charging? The left side is TX, which is the launchEnd, the corresponding product is a 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.
1, Wireless charging emission circuit board (PCBA) is an electronic component used to achieve wireless charging function. It is one of the core components of the wireless charging system, responsible for converting electrical energy into wireless energy signals and transmission. PA CBA usually consists of multiple components, including a power supply, inductor coils, circuit control chips, filters, and connectors.
2, the wireless charging circuit to use LC output for the following reasons: The wireless charger charging method is to use a wireless charging board and the induction of the magnet generated between the mobile phone induction magnetic flux, the magnetic force into a power, current transmission.
3, electromagnetic induction primary coil of a certain frequency of alternating current, through electromagnetic induction in the secondary coil to produce a certain current, so as to transfer energy from the transmission end to the receiving end.
5, the working principle of the wireless charger: the principle of electromagnetic induction, through the coil for energy coupling 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 supply power to the system directly. Go byAfter the power management module output direct current through 2M active crystal inverter converted into high frequency alternating current supply primary winding.
6, wireless charging system mainly uses the principle of electromagnetic induction, energy coupling through the coil to achieve energy transfer. As shown in Figure 1, when the system is working, the input end converts the AC mains into direct current through the full-bridge rectifier circuit, or uses the 24V DC end to directly supply power to the system. After passing through the power management module, the output direct current is converted into high-frequency alternating current through the 2M active crystal oscillator inverter to supply the primary winding.