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This lesson talks about the charging circuit structure of Hisilicon mobile phone

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First look at what components are in this circuit

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With tail plug, charging chip, battery interface, and CPU

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In this circuit, the charging is done like this.

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When the charging cable is plugged into the mobile phone,

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the 5V voltage will be given to the charging chip, and the charging chip will detect it

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This CC pin is responsible for detection, and the CC pin changes

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The charging chip detects the change of the CC pin and judges it as charging

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When the voltage of the detection pin is normal,

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the charging chip will control and turn on the MOS tube,

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and the 5 volt power supply will enter the input terminal of the charging chip

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After entering the charging input, the charging chip will send an interrupt signal

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The CPU can also control the charging chip through the I2C bus

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At this time, the charging chip turns on the internal step-down circuit to adjust the inductance

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Here a voltage is output to the main power supply line

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Then the MOS tube inside the charging chip is turned on to the positive pole of the battery to charge the battery

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This is its charging process

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The premise of charging is the connection of the battery,

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the connection of the battery data and the detection of the temperature

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These are all normal, in order to charge

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In the case of maintenance, plugging in the charging cable responds but there is no charging current

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Generally, the CC pin needs to be considered.

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The DP and DM pins are generally not connected, so it is not considered

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If the DP pin and DM pin are abnormal, there is no response when plugging in the charger

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The main consideration is CC1 pin and CC2 pin

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If their ground value is low, it will cause the plug-in charger to respond but no charging current

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Usually it is because the anti-static protection components on this circuit are abnormal

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Just remove this anti-static component

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This is a common problem of Huawei

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If the ground value of the CC pin is infinite,

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usually after plugging in the charging cable, the phone will not respond

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Another reason is that the charging chip is damaged, just replace the charging chip directly

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That's all for this lesson