How to calculate the power of Li-ion battery charger?

How to calculate the power of a lithium-ion battery charger? Now our lives are inseparable from the Internet and mobile phones, and mobile phone chargers are also indispensable products, so how to calculate the power of mobile phone chargers? Today we take a look . 1. The output of a lithium-ion battery charger is usually direct current. You can use the formula pu003dUI. That is, the maximum output power u003d rated output voltage * maximum output current, the unit of voltage is V, the unit of current is A, the unit of power is W, the unit of current is MA, and the unit of power is MW. 1au003d1000ma. Li-ion battery charger 2. Li-ion battery charger is not a pure resistive load, and its power factor is not 1. Therefore, this formula cannot be used to calculate the input power. The input power should be pu003duicos. 3. The input current of 200 mA is the maximum input current (usually marked as 200-300 mA). It is not the actual operating input current, but the full load input current when the input voltage is the smallest (rounded to the nearest integer). The working voltage range of P.S. power supply is generally nominally 100-240v, and the actual design is 90-265v. 4. Ac, 220v and 200ma are root mean square values. Since the AC input is a rectifier bridge, the current is non-linear, and the effective value of the voltage and current is directly multiplied by not equal to the active power (multiplied by the power factor). Regarding the low-power power supply without power factor correction, the measurement is generally around 0.3-0 and 5). The most convenient way to measure input power is to use a power meter. 5. The energy efficiency of lithium-ion battery chargers is generally between 70-80%. The specific index is related to the output power. Refer to the calculation formula of the 5th edition EPA or COC standard. A simple calculation is as follows: According to the US VI energy efficiency requirements, the efficiency of 5V1A power supply is greater than 73.623%, and according to the requirements of the fifth edition of the EU COC, the efficiency of 5V2A power supply is greater than 73.773%, according to the VI energy efficiency requirements of the United States. NTS, the efficiency is greater than 78.704%, the efficiency is greater than 79.004 According to the requirements of the fifth edition of euCOC, and then smoothed to 5V1A power supply: output power: 5V*1Au003d5W efficiency calculation 74%. According to the above calculation, 6.According to relevant experience, the AC input active power is 5w_0. 74u003d6.757W, the power factor is 0.4, and the minimum input voltage when the input current RMS16.892u003d168.92MAVA/100v is 6.757W_0. 4u003d16.892VA The input current tolerance is 200 mA. The difference between the main input power and the output power is so large, because the input power calculation error (should be calculated below 100 volts), and underestimated the power factor * efficiency conversion rate. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Li-ion battery charging method you don’t know