Auto E-Ideas: Power supplay

11 March 2015

12V to 5V Mobile Phone charger circuit (SMPS type)

Posted By: ltsharma on 3/11/2015

Views:

The Voltage regulation Hero LM7805 will not works as we expected here, it will not provide enough juice(current) to charge cellphone's battery, especially more that 1500mah battery, So we need more current that provides enough juice to cellphone.

Here we are using LM2596 (Texas instruments) this provides 3A switch mode power supply. That is more than enough to charge 2 cellphones, Don't worry if you charge 1 cellphone, phone takes only max of 1A. It is the best/fast charging circuit i ever experimented.

Then here we go

Schematic

Components:

IC1:LM2596
D1: 1N5824 (schotty)
L1: 33uH (coil & core type).
C1:680uf 25V
C2: 220uF 16V (different in schematic)
R1,R2:100K
R3: 470 Ohm.
LED
USB connector*

Project files and PCB:

Reference: http://www.ti.com/lit/ds/symlink/lm2596.pdf
Any problems comment below or ping in Spot.IM community>>

10 March 2015

12V to 5V Clean Filtered DC power supply for automobiles

Posted By: ltsharma on 3/10/2015

Views:

This circuit is to provide power supply for 1A 5V digital gadgets like gadgets including LCD, Microcontroller, or any gadgets or components that need neat and filtered 5V.

The microconroller based project for automobiles mainly having problems with power supply line, the car, motorbike or any automobile power supply includes starter motors, Horns, relays and so many voltage surging elements, the motors and relays may cause high backward spikes that may cause reverse polarity in line for few micro seconds. in other hand horn and again starting motor may cause sudden null voltage effects. But microcontroller needs pure uninterrupted power supplay.

The LM7805 is the hero of low cost voltage regulator as you are always use, But only 7805 didnt work for Automobile electronics it needs filter of-course. So here we are.