What is the Circuit for a Diode OR Gate with a 12V Battery Backup?

In summary, the conversation discusses an electrical network for a diode OR gate and the functioning of a 12V battery in the circuit. The attached images show two different loops and the question of what stops the current from flowing in one of them. It is explained that when the 15V supply is turned off, the second diode conducts and puts the first diode into reverse bias. The conversation ends with a question about redrawing the circuit with a resistor to incorporate the resistance of the Earth.
  • #1
dobry_den
115
0
Hi! http://www.phys.uAlberta.ca/~gingrich/phys395/notes/node71.html" [Broken]'s an electrical network for a diode OR gate. It says there that "[t]he 12 V battery does nothing until the power fails; then it takes over without interruption."

I just wonder what electrical circuits (closed loops) are there. I attached an image of how I think the loop looks when the 15V power supply works. But what about the battery loop in this case?
 

Attachments

  • loop.GIF
    loop.GIF
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  • #2
In Loop1 (see the attached images), the orientation of the diode makes it impossible for the current to flow. But in the Loop2, the orientation of the same diode is fine for the current to flow - so what stops it from flowing?
 

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  • loop1.GIF
    loop1.GIF
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  • loop2.GIF
    loop2.GIF
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  • #3
When the 15V supply is on, the 2nd diode is reverse biased (with about 14.3V on its cathode, and 12V on its anode). When the 15V supply is turned off, then the second diode conducts with 12V on its anode and about 11.3V on its cathode. This puts the first diode into reverse bias (off), with 11.3V on its cathode and 0V on its anode. Make sense?
 
  • #4
Yep, it makes in a way..thanks. But still, I have another question. Could the electric circuit be redrawn in the way I did it in the attached image? The resistor is there to incorporate the resistance of the Earth. Or would you propose any changes?

Any help is appreciated, thanks in advance.
 

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  • circuit.GIF
    circuit.GIF
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1. What is a diode gate electrical network?

A diode gate electrical network is a type of electronic circuit that uses diodes to control the flow of electrical current. It is commonly used in digital logic circuits to perform Boolean logic operations.

2. How does a diode gate work?

A diode gate works by using the properties of a diode, which only allows current to flow in one direction. When the input signal is high, the diode allows current to flow through and the output is also high. When the input is low, the diode blocks current and the output is low.

3. What are the advantages of using diode gates?

One advantage of using diode gates is their simplicity and low cost. They also have a fast response time and can be easily integrated into larger circuits. Additionally, diode gates have a low power consumption and are less prone to electrical noise.

4. What are some common applications of diode gates?

Diode gates are commonly used in digital circuits for logic operations such as AND, OR, and NOT gates. They are also used in computer memory, microprocessors, and other electronic devices to control the flow of data and signals.

5. Are there any limitations to using diode gates?

One limitation of diode gates is that they can only perform basic logic operations and cannot be used for more complex functions. They also have a limited voltage and current handling capacity, so they may not be suitable for high-power applications.

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