USB Circuit Diagrams

USB Mobile Charger Circuit

The use of USB Mobile Charger outlets in laptops and computers has made it easier to charge your mobile devices. This circuit gives you with a controlled voltage of 4.7 volts for charging your phone. The USB outlet provides 5 volts of DC power and 100 milliamps of current, which is sufficient for gently charging a mobile phone. We can also utilise this circuit to charge our phones while on the road. As a result, we can classify it as a Mobile Phone Travel Charger Circuit.

The charging is done using the mobile’s USB connector, which is a very useful voltage source for charging the phone. On most computers on the market today, there are two to four USB ports. The term USB stands for Universal Serial Bus. It is one of the most recent iterations of a way for getting data into and out of your computer. The fact that the USB port provides 5 volts of electricity to external devices and may be found at pin number 1 but pin number 4 is 0V causes us concern. The USB port can deliver up to 100 milliamps of electricity, which is more than enough for this modest application.

USB Mobile Charger Circuit Diagram:

USB Mobile Charger

Components used in this Circuit:

  • R1-470E
  • C1-100uF/25V
  • T1-BC547
  • Zener diode-4.7V/. 5W
  • Diode-1N4007

Components Description:

  • Resistor: Flow of current in the circuit is being controlled by the resistor.
  • Capacitor: It is mainly  used to store the charges. It is of two types polarized and non-polarized, electrolytic capacitor is an example of polarized while ceramic and paper is non polarized.
  • Transistor: Itused to enlarge the signal strength or to open or close the circuit.
  • Zener Diode: When the voltage achieves the breakdown point it starts working but in the reverse bias state.
  • Diode: It is a having two terminal named as anode and cathode. It allows the current to flow only in the forward direction while stopping the flow of current in the backward direction.

USB Mobile Charger Circuit Description:

The large number of mobile batteries work on 3.6 volts 1000 to 1300mAh.These battery are combinations of three Lithium cells whose voltage rating is 1.2 volts for each. And for charging mobile quickly there is a need of 4.5 volts and current range of 300-500 mA.

It is best to charge your battery slowly if you want to improve its efficiency. The circuit described below operates at a regulated voltage of 4.7 volts and provides enough current to charge your mobile phones slowly. The voltage at the output is harmonized by the transistor named T1. While the Zener diode ZD controls the output voltage and D1 protects the polarity of the output which is supplied,

The front half of the circuit should be connected with a “type” of USB plug. To make polarity identification easier, pin 1 is connected to the red colour wire, while pin 4 is connected to the black colour wire. Connect the circuit’s output to the proper charger pin to connect it to your cell phone. After all of the circuit’s components have been assembled, insert the USB plug into the socket and use a multimeter to measure the output from the circuit. If you have the correct output and the polarity is connected correctly, you can connect your phone to it.

Now a days you will get a multicharger easily available marker just purchase one and charge your moble easily when you are in train or bus as every now carries laptop or note pad with them.

Note: Extreme care is needed to be taken that polarity are connected in the right manner, if it attached in wrong style it will damage the battery of your mobile phone.

A USB cable is required for the construction of a USB mobile charger, and the cable must include at least one male socket with a strip back of about 5cm with exterior padding and protection from the USB cable’s “uncovered” end. In typically, USB cables are made up of four red cables, as well as black and green cables ( along with the protestors). Because the green and white wires are utilised to transport data, there is no need for that cable, so it can be clipped (there we should need to pay attention that the wires within their padding and are not exposed). The negative colour wire is usually black, while the positive colour wire is red. The voltage we obtain from the battery is 5V.And more than 500mA current cannot be supplied to the device that is attached to the USB port. Attached the power line with the USB plug examine the right polarity.


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