Mobile phone charging circuit composition and working principle - Power Circuit - Circuit Diagram

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

MOS power IC full range

One-piece inductor

2, charging detection circuit

This circuit generally has two functions:

1) The function of charging to start the power, it is a high level boot;

2) The function of detecting the current of the charging input. If the charging input is too large, the power supply IC will start the overload protection circuit inside the charging IC, so that the charging wheel inputs the grounding portion when the charging IC is partially divided. At this time, the phone usually displays “Failed to charge” and then turns off the entire charging circuit. If the current input is too small, the phone will also display “Failed to charge” and then turn off the entire charging circuit!

3, external power supply circuit

In general, this circuit also has 2 functions:

1) Substituting the power supply IC for the power supply of the VBATT;

2) The output of the charging IC will be read as a kind of data by the power IC! (This is of course controlled by the CPU)

4, the control circuit

In fact, this part of the circuit and the mobile phone can not be properly charged, it can be said that there is no practical relationship, it is only to play a role in turning off the charging circuit, equivalent to charging shutdown circuit! If you deliberately make this circuit artificially "open circuit" as long as the charging input meets the charging standard, the mobile phone can still be charged, but it can not automatically turn off the charging circuit!

5, the battery detection circuit

This is also the type of pool, temperature detection. How can I complete this work without the phone being turned on?

I believe that many "players" don't know!

With NOKIA as the column, when the power ICA3 pin detects the charging input, the power IC will start the power supply voltage regulator circuit, and then output each group of regulated power supply that meets the power-on requirements. It is the same when the power supply ICA4 pin is turned on. The output regulator is the same, but it does not start the regulated output of the signal! (Whether it is Siemens, or the regulation output of any mobile phone signal is started by software), when the CPU receives the power supply and the clock signal, it will establish communication with the power IC to help complete the mobile phone. Charging work