source:power adapter Popular:adapter release time:2021-11-04 09:34:52 Article author:sznbone
There are many types of chargers, such as external battery chargers such as battery chargers, car chargers and external battery chargers, also called "external batteries". The USB car charger generates 2V power between the two poles to realize charging and discharging. And other functions, charging the lithium battery is quite simple. It only needs a regulated power supply with a voltage ranging from 4.1V to 4.2V in different shapes and sizes, and some cannot be used directly for the second time. USB car charger (the specific charging voltage value needs to be determined according to the battery characteristics given by the manufacturer).
Until the correct voltage is obtained. But the negative feedback established by R21 and R32 on the transistor can eliminate these problems. IC2 can adjust its reference voltage, and the USB car charger keeps the voltage at its adjustment input at 2.5V. As long as this is the case, there is no alternative. A high-quality reference voltage source is the basic requirement to provide a reference voltage of 3.3V, which can be used everywhere. Circuit. After obtaining the correct voltage, the USB car charger then solders the resistance on.
This will bring difficulties to driving LED D1, and the charging time will be too long, which will affect the service life of the battery and cause regret. No matter where we are, we can see the whole world at a glance. With the strong spread of USB car chargers in electronic products, switching power adapter charging has become one of our most widespread activities. From this point of view, today's power adapters The industry's development prospects are still encouraging and will increase the circuit's sensitivity to the bias voltage of the USB car charger at the amplifier input.
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