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<p>The nominal voltage of the<a href="https://www.fuyuanpower.com/power-adapter" rel="noopener noreferrer" target="_blank"> <a href="https://www.fuyuanpower.com/power-adapter" target="_blank">power adapter</a></a> usually refers to the open circuit output voltage, that is, the voltage value without current output without any load. Therefore, it can also be considered as the upper limit of the output voltage of the<a href="https://www.fuyuanpower.com/power-adapter" target="_blank"> power supply</a>. Any <strong>power supply</strong> has a certain internal resistance. When the power supply outputs current, a voltage drop will be generated internally and heat will be generated at the same time. After considering the heat dissipation problem, the general design generally limits a current value. When the output current reaches this value, the output voltage is reduced to 95% of the nominal voltage, or other proportions, each manufacturer can set according to the different needs of the load product The higher or lower the ratio, the current value is the nominal current.</p><p><br></p><p>The basic principle is that a <a href="https://www.fuyuanpower.com/power-adapter" rel="noopener noreferrer" target="_blank">power supply</a> with a large nominal current can replace a power supply with a small nominal current. How much the current is depends on the load under the same voltage, that is, the work of the book. When the book is running at a high load, the current is larger. When the book enters standby, the current is smaller. The power supply with a large nominal current has sufficient current margin, and will not overheat or output voltage is too low after replacing the power supply with a small nominal current. Conversely, when a small nominal current power supply is used instead of a large nominal current power supply, it may happen that the load current is too small and the power supply overheats or even burns.</p><p><br></p><p>The power supply to the notebook is different from the battery to the notebook. The output of the battery is pure DC, which is very clean. It can be directly connected to the DC transformer module. The voltage of the battery is neither possible nor high. Microelectronics The voltage requirements of analog signals and digital signals in the circuit are basically 5V at present. 10.8V is enough to remove the efficiency and pressure drop requirements of the transformer module. If the <a href="https://www.fuyuanpower.com/power-adapter" rel="noopener noreferrer" target="_blank">power supply</a> is used, the voltage needs to be regulated and filtered to ensure stable operation when the power supply performance is not very good. The stabilized voltage is divided into two channels, one to supply power to the work and the other to charge the battery. The part that supplies power to the notebook has the same experience as when the battery is powered, and the part that charges the battery needs to be added to the battery cell through the battery's charge control circuit, and the charge controller circuit will greatly increase the voltage during the adjustment Decrease, and the voltage actually applied to the battery will never be very high. </p>
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