The design and specifications of mobile phone chargers will vary depending on the manufacturer and model, so it is not possible to provide a specific number to answer your question. In general, the main function of the mobile phone charger is to convert alternating current to direct current, and provide the appropriate voltage and current to charge the mobile phone.
Mobile phone chargers usually use transformers to boost or reduce voltage to meet the requirements of mobile phone charging. The specific value of the boost depends on the design and specifications of the charger, but in general, the output voltage of the mobile phone charger is about 5V to meet the charging needs of the mobile phone. If you have more questions about a specific phone charger, it is recommended that you consult the charger's user manual or consult the charger manufacturer for accurate information.
Can increase the voltage by 18v
The 4-pin chip is an optocoupler; The optocoupler uses light as the medium to transmit electrical signals, which has a good isolation effect on the input and output electrical signals, because the optical coupler input and output are isolated from each other, the electrical signal transmission has unidirectional characteristics, so it has good electrical insulation ability and anti-interference ability, so it is widely used in various circuits. At present, it has become one of the most diverse and widely used photoelectric devices.
The 4-pin chip of the mobile phone charger can boost the voltage range between 1V and 20V, depending on the voltage and charging current of the phone. During the charging process, the 4-pin circuit will continuously increase the voltage to achieve the purpose of charging.