1, the current mobile phone charger is generally QC and PD protocol, but also the kind of common USB-A and Type-C output.
2, schematic diagram: charger (charger) according to the design circuit working frequency to divide, can be divided into power frequency machine and high frequency machine.
3, the working principle of Figure 1, CV1 ~ VC2 composed of filter rectifier circuit, transformer T is a high-frequency transformer, VRC11 composed of power switch tube V7 protection circuit, NF for the supply of IC power supply winding.
4, because the switching power supply working frequency is high, so it needs a work>For you?
1, the advantage of A is that the internal integration of two identical nmos tube, for lithium battery protection circuit is very convenient, can also be replaced by other mos tube, need to pay attention to the mos tube G input voltage range, voltage resistance, current capacity, power dissipation capacity, etc., according to the lithium battery specifications to choose the appropriate mos tube.
2, A chip is a double MOS power tube, it can cooperate with DW01 to form a battery protection circuit. I bought several pieces of this protection circuit board on the TB, for 18650 batteries, only 2 yuan more than a piece.
3, lithium battery protection board current is determined by the protection IC detection voltage and MOS tube internal resistance, if the protection IC can not be changed, you can change the MOS tube, such as DW01 and 8205MOS, with a MOS tube is 2~5A, with two MOS tubes in parallel current will be doubled. At present, some large-capacity mobile power supplies use 3 to 4 MOS tubes in parallel.
Electromagnetic inductionA certain frequency of alternating current in the primary coil generates a certain current in the secondary coil through electromagnetic induction, thereby transferring energy from the transmission end to the receiving end.
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.
Wireless charging methods include electromagnetic induction, magnetic resonance, electric field coupling and radio wave transmission, etc. Wireless charging of mobile phones mostly uses the principle of electromagnetic induction.
The principle of wireless charging of mobile phones in the general sense is that electrical energy is converted into a magnetic fieldThe process by which magnetic fields are transmitted through the air and then converted into electrical energy. The principle of wireless charging is somewhat similar to the understanding of the transformer in the popular sense, the transformer magnetic field coupling circuit is a magnetic conductor, the wireless charging magnetic field coupling circuit is air, and the magnetic medium is different.
The above is the schematic diagram, the principle used is the principle of electromagnetic induction.
During the discharge process, when the voltage of the single battery is reduced to 30V, the OD pin of DW01 outputs the signal to discharge control MOSFET off, the lithium battery immediately stop discharging, so as to prevent the lithium battery from being damaged due to overdischarge, DW01 CS pin is the current detection foot, when the output short circuit, the charge and discharge control MOSFET's on-voltage drop increases sharply, CS pin voltage increases rapidly, DW01 output signal makes the charge and discharge control MOSFET quickly shut off, so as to achieve overcurrent or short circuit protection.
The specific charge and discharge current is related to the capacity of lithium batteries, and lithium batteries have a nominal capacity, which is Ch. For example, a battery 1653 nominal capacity of 1000mAh, then C=1000mA, 0.5C charge and discharge currentIt should be 500mA; The charge and discharge current of 1C should be 1000mA. The standard for fractional capacity charge and discharge of lithium batteries is 0.2C. Capacity type finished lithium battery charging should not exceed 0.5C.
The maximum discharge current of the lithium battery is 1C, the discharge current of the high-rate lithium battery is 4C, and the power battery is 10~20C. The C here refers to the battery capacity, that is to say, the maximum discharge current of the ordinary lithium battery 1000mAh is 1000mA. The maximum discharge charge of 1000mAh power battery can reach 10~20A.
Different 12v lithium batteriesIts rated discharge current is also different. According to the national standard, the rated discharge current of a 12v lithium battery marks its maximum output current capability. For example, a 7800mAh 12v lithium battery has a rated discharge current of 1C, that is, 7800mA; The rated discharge current of a 3000mAh 12v lithium battery is 0.2C, that is, 600mA.
1, burn is not recommended to use, not safe. It is recommended to select with short circuit protection andMobile power supply with reverse protection.
2, general charging treasure will have short circuit and overcurrent protection. If it does not work, you can reconnect the charging bank charger, charge it and unlock the self-lock. If the charging treasure is recharged, it still cannot work, that is, the internal line chip is damaged, which is basically impossible to repair, and now the charging treasure is made of one-time cladding, which cannot be disassembled. It can only be disposed of as scrap.
3. As you said, the interior may have burned down. It is difficult to repair, if it is human reasons, I recommend you to choose a new one.