The 555d chip is identical to the 555 chip
The NE555D chip generates a pulse frequency of 36.7K (because after debugging at 36.7K frequency, the efficiency reaches the highest), and the IRFP460 power amplification, so that the transmitting coil generates a magnetic field, when the receiving coil is close, the induced current is generated, and the charging voltage and current required by the load (mobile phone) are obtained through full wave rectification and voltage regulation. The current of the transmitting coil increases with the increase of the induced load. The load voltage of 0.33 O&M is amplified 23 times by the operation amplifier, and then the voltage U1 is compared with the reference source Uo by 1N4148 rectification filtering. When charging, U1 is greater than Uo seven colored lights shining, indicating that it is charging; When the load is empty or fully charged, U1 is less than Uo, the green light is on, and if there is no inductive load after 10 seconds, the power will be automatically cut off
The internal structure of the NE555 integration block is basically the same as that of the NE555D and NE555N integration blocks.NE7555 is a CMOS device and NE555 is a bipolar device. Bipolar devices have a wide voltage range.