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Simple Power Bank Circuit to Charge Mobile Phone

Simple Power Bank Circuit to Charge Mobile Phone is discussed in this article.

This circuit is easy to make at home using few parts.

It is good for emergency when there is no power.

It also help to charge phone anytime and anywhere.

Parts Needed for Power Bank Circuit:

Li-ion Battery 7.4V 2600mAh:

Voltage Regulator IC 7805:

How to Build:

Parts List:

CategoryComponentQuantity
SemiconductorsIC 7805 Voltage Regulator1
Power Source Li-ion Battery 7.4V1
Electronics Mobile USB Port for Charging1

How to Connect Everything:

Parts for Charging Power Bank Battery at Home:

9V AC-DC Adapter:

9V Zener Diode:

TIP35 Transistor:

Connection Details:

Parts List:

CategoryComponentQuantity
Resistor100Ω 1W Resistor1
SemiconductorsTIP35 Transistor1
Zener Diode 9V 1W1
Power Source Li-ion Battery 7.4V1

Formulas and Calculations:

Important Things while using Power Bank to Charge Phone:

Here is easy formula to know charging time:

Charging Time = Battery Capacity / Charging Current

where:

Example:

Say phone battery is 3000mAh and power bank gives 1000mA current.

Charging Time = 3000mAh / 1000mA = 3 hours

So to charge phone from 0% to 100% it take around 3 hours with 1000mA power bank.

But this is just simple guess a teal charging time can change because of charging circuit, battery condition or its efficiency.

Circuit Working:

How does the charging circuit works is mentioned below:

Simple Power Bank Circuit to Charge Mobile Phone get steady 9V DC from 9V adapter.

Zener diode keep TIP35 base voltage around 8.6V after small drop.

TIP35 work in emitter follower mode so output at emitter is little less to around 8.4V.

This 8.4V is good for charging 7.4V Li-ion battery.

TIP35 emitter and battery share the same ground.

Battery positive is connected to TIP35 collector.

This simple charger circuit help charge Li-ion battery safely at home using 9V adapter.

After battery is full it can be used in power bank to charge phone when there is no power which is good for emergency.

Conclusion:

This Simple Power Bank Circuit to Charge Mobile Phone is easy to understand with no hard math used so anyone can follow it.

Most people just want safe way to charge phone and does not need big calculations so it also show ready-made modules that are easy to use.

This saves time and there is no headache in building full circuit.

Short and simple explanation is better to read and remember.

Also make less mistakes so charging stay safe.

References:

Analysis of Specified Capacity in Power Banks

Powerbank

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