[SOLVED] DC input to a bridge rectifier

[piyushpandey]

hello guys


here I was studying a schematic on this site:

https://www.guidecircuit.com/Circuit-PC-Hardware-RS232-RS485.htm



and than I saw a very strange thing in the schematic of the circuit and that is that he has provided 9 V DC input to the bridge rectifier instead of the AC input.

As I and you guys know that the use of the bridge rectifier is as the rectifier and the input is AC not DC and we get output as DC .


So what is the basic funda of this designer behind this schematic.


please give me link or any other notes or link related to this awesome use actually I want to decipher this use of a rectifier with DC at it's input.


thank you

 

[murali_dece]

it is normal practice of some manufactures to provide bridge at incoming power. bridge protects the circuit from DC polarity mis match. how ever the power connector polarity orientation the bridge yields correct polarity to circuit.

 

[piyushpandey]

thank you murali for your reply


you mean to say that whatever is the polarity of the DC voltage at the input of the bridge rectifier , whether it is right or in the opposite direction the output of the bridge rectifier will always be in the same right direction and power supply will be maintained in both conditions.

can you please provide me some links where it is described in detail.


thank you

 

[sherazi]

its normal.. it will ensure if u connected an AC source it wont damage the board..

 

[tpetar]

You can connect also AC to J1 connector without problem, and graetz (bridge) also can in other hand to ensure correct polarity.