Can DC power supply be used as a charger for lithium batteries?
Diode is the role of polarity protection, many appliances are equipped with this component. Answer your charger problem. In principle, your DC power supply can charge your charger. Adjust to the corresponding voltage can be. But there are problems you are hard to know: how much charging current? How much charging time is required? If you do not know this, will soon put your electrical equipment filled with bad. If you understand power, will measure its charge current, it is very simple. You can use 10 times the rate of charge, you can also use 5 times the rate of charge. Summary of my conclusions: 1, if you understand the electricity, you can use its charge. 2, if you do not understand the electricity, it is recommended not to use, or your battery inside the battery is easy to be filled with bad.
Plus a current limiting resistor can be. Lithium battery to bring a protective plate, will automatically turn off after charging.
Can not be directly as a lithium battery charger.
Lithium-ion battery on the charger requirements are higher, in the initial charge should be in accordance with the constant current charging mode, theoretically the smaller the charging current the better the battery, but it takes too long is not practical, China's national standard low-rate charge Is 0.2C (C is battery capacity). Battery voltage with the charging process gradually increased, when the battery voltage reaches 4.2V, you need to change the constant current charge for constant voltage charging. With the constant charge charging process continues to reduce the charging current gradually, when reduced to 0.01C, that charge termination.
As the lithium-ion battery nominal voltage of 3.7V, charge cut-off voltage of 4.2V, there are significant differences, so the use of fixed voltage regulator power supply can not be constant current charging, must start the current is too large, or the back of the current is too small. If the voltage regulator of the voltage regulator is low, although the starting current is not large, but there will be full of dissatisfaction; if the tune is higher, the initial stage of charge due to the battery voltage is too low, the pressure difference is too large Charging current Excessive shortcomings, greatly shorten the battery life; if the output voltage accuracy is poor, the voltage exceeds the upper limit of 4.2V, will occur overcharge, serious damage to the battery.
In addition, the regular charger is also equipped with: the temperature control during charging; LED charging status indication; battery abnormal state detection and other additional circuit functions.
So the DC power supply must be through a dedicated constant voltage, constant current control circuit to charge the lithium battery.
