Several of the most common methods and principles for fast charging of mobile phone lithium batteries

Several of the most common methods and principles for fast charging of mobile phones. Smart phones rapidly increase the energy consumption of mobile phones. Capital and battery skills are limited battery life time. There is no way to deal with battery life time. It seems that it is to provide users with faster charging processing backup. Of course, in this context, mobile phone fast charging technology is now more and more favored by mobile phone manufacturers and applications. One: The principle of fast charging technology-the principle of fast charging The battery center is still lithium batteries, most manufacturers use both open source and throttling valve. Battery manufacturers are trying to increase energy density and capacity, while chip manufacturers are looking for low-power plans. . Because the effect is not obvious, manufacturers began to choose the curve to save the country plan: to increase the charging speed of mobile phones, from the habitual 1-2 hours to shorten, in order to reduce the cost of charging time, in exchange for convenience. The basic condition of battery charging is: the voltage of the charger is higher than the voltage of the battery, and it has the ability to overcome the voltage of the battery to make it charge current and complete the process of charge transfer. I learned power(P)u003dvoltage(U)xcurrent(I) in the physics class of junior high school. When the battery is in a certain state, power represents the charging speed, which can be shortened by the following three methods: 1. The current is constant and the voltage is Increasing 2. Constant voltage forward current 3. Both voltage and current increase the charging is the same as water in a pool. The gradual voltage will put more pressure on the pool wall and bring safety hazards. Therefore, it is not much to choose progressive voltage. From the physical calculation formula, we can see that power (P) u003d voltage (U) x current (I). In a certain battery state, power marks the charging speed. We can shorten the charging time by the following three methods. The principle of fast charging 1. High-voltage constant-current form: The general mobile phone charging process is to first reduce the 220V voltage to the 5V charger voltage, and then reduce the 5V charger voltage to the 4.2v battery voltage. During the entire charging process, if the voltage rises, heat will appear, so the charger will heat up during charging, and the phone will also heat up. The greater the power consumption, the greater the harm to the battery. 2. Low-voltage and high-current form: Under a certain voltage, add current and use a parallel circuit for shunting. Under the condition of constant pressure, the pressure on each circuit after parallel connection is smaller. 3. High voltage and high current form: This method is added with current and voltage. Pu003dUI is based on the previous formula. What we can know is that this method is the best way to add power, but it is newly added. Voltage can produce more heat, therefore, more energy consumption, new voltage and current are not unlimited. A common problem with these three methods is that they require more electronic components for chargers, mobile phones and charging cables. Qualcomm hopes to use its own technology to do the third method, while OPPO chose the second method to increase the charging power. The improvement of constant voltage current is even more in practice. The adapter is now a mobile phone standard. As a general rule, 5v/1 output, some suppliers will advance the charging current2, to some extent, shorten the time for mobile phone charging, which is indeed a The treatment plan, but the problem is that, first of all, you need 2 chargers and phone support. With a controller, the mobile phone can support not much current. If you use 2 only supports 1 mobile phone charger, it is actually only 1 output. In addition, the current cannot go unrestrictedly. High-current charging will generate more heat. If the heating rate exceeds the heat dissipation rate, and there is no maintenance mechanism, the temperature of the battery will continue to rise, the lifespan will decrease and even cause an explosion. All electronic products, chargers and products themselves limit the maximum current. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.