When the charger is charging, if it encounters a poor quality charger, it will spontaneously ignite for no reason, explode the mobile phone, or even get an electric shock while charging, causing personal injury. All this stems from the quality problems of the electronic components in the charger. The Y capacitor of the mobile phone charger is used for common mode filtering. It is connected between L and ground or N and ground to filter out the common mode signal of L to ground or N to ground. The Y capacitor is usually used symmetrically, and the role is mainly to bypass; decoupling; filtering; energy storage.
There is a capacitor with a voltage of 400v at the primary end of the input, which is the main filter capacitor, which filters out the clutter after the mains rectification, then the subsequent circuit can get a more stable DC sine wave. Only the less clutter, the circuit can be more Good stable operation. As for the capacitor, choose 400V withstand voltage. After the switch circuit works, there will be more than 300 volts drop across the capacitor, plus the peak voltage at the moment of power on, so if the withstand voltage is too small, it will affect the capacitor Burst, and the output terminal capacitor selects a suitable withstand voltage value according to its output voltage, such as 5v, the withstand voltage value is 10v, the capacitor is also a filtering function, so that the charger outputs a stable DC power, as for the size of the capacity, the front withstand voltage Large capacitors generally choose 47~470uF, output capacitors are generally 100~1000uF, in principle, the larger the capacity, the better, but in fact, the larger the capacity, the greater the leakage current, the y capacitor through AC resistance DC. Therefore, we must choose a good quality charger when charging the mobile phone. The quality of the y capacitor is good or bad.
As the Y capacitor in mobile phone chargers, quality assurance is very important. When choosing Y capacitors, you must have the certification of a safety inspection agency and the safety certification of various industrial countries. There are certification marks on general products.
The Y capacitor of the mobile phone charger is used for common mode filtering. In principle, the larger the capacity, the better. However, the larger the capacity, the greater the leakage current. The y capacitor is connected to AC and DC. So we need to choose a good quality charger when charging the mobile phone. And the quality of the y capacitor is good or bad, the quality of the direct charger.
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