acarduinobridge-rectifierdcintegrated-circuit
I am currently attending High School, so I don't expect too much here. I simply want to know all the recommendations for this circuit (Capacitor values, etc).
But I mainly want to know if this circuit will take 120V AC and charge a battery in parallel with the load which will be a future bare-bone Arduino circuit.
NOTE: Bridge Rectifier Will Be A NTE5326.
Circuit Image:
Data Sheets:
You could power a small 24V relay via a bridge rectifier and small smoothing capacitor. Use the relay contact outputs to feed the appropriate dc voltage to the arduino. Here: -
The 26V ac when present will activate the relay via the bridge and the small capacitor (10uF) should keep the rectified peaks from chattering the relay at AC (x 2) frequencies.
It's "x 2" because (say) 50Hz AC adopts a 100Hz profile when bridge rectified.
You could also use an opto-isolator fed from a bridge circuit too. This would need a smaller capacitor and a series resistor with the diode of the opto. The transistor part of the opto could switch 5V (or 3V3 or whatever DC you are using) to the arduino.
Do not work with the idea that the GREEN LED and the BLUE LED can be operated without series resistor. As a starter the paralleled LEDs with lower forward voltage will starve those with higher forward voltage. Series resistors for each can even this out and take care of that problem.
Next it is typical problem that BLUE LEDs do not always work well from a supply of just 3.3V. Consider getting your design modified to add a 5V source to supply this LED and still apply series resistors for these LEDs for the reason given above. With the problem as stated you may be able to find some BLUE LEDs that will give you satisfactory brightness from 3.3V but they will be dim in comparison to the others.
Do not second guess the need for the bypass capacitors. Put them in by the power pin pairs of each IC chip.
Note you failed to hook up one of the VCC pins of your MCU. It is essential to connect all power and ground pins of IC chips.
If you want to have a charger for the battery then you should plan to put in a regular power supply circuit for your design that can accept input from the battery or from some AC-DC converter module. When the AC-DC supply is present then have the battery go into charge mode.
Best Answer
No, the maximum voltage of the LM2576 is 45V. There are also a few other problems with the schematic above:
- You need to have an isolation transformer on AC mains for safety purposes
- AC mains can have spikes over 400V, from lightning or other devices. You need protection from these spikes.
- AC mains should be fused, so in the event of a fault, it becomes disconnected.
EDIT
A circuit like this with a transformer would be better, instead of a 7805, put your DC to DC there. Use a step down transformer to get the voltage to the recommended voltage of the DC to DC converter.