How to analyze diode circuits? (Find waveform generated)

In summary, the conversation discusses analyzing circuits and the current flow through diodes. Five different scenarios are presented, with diagrams and explanations of the resulting waveforms. The individual's understanding and progress in completing the questions is also mentioned.
  • #1
eehelp150
237
0

Homework Statement


To analyze these circuits, we need to draw the current path right? I know that current can only flow one direction through a diode.
http://i.imgur.com/kipBcax.png

Homework Equations


N/A

The Attempt at a Solution


Are these paths correct? Green = positive, red = negative
1. Positive edge can only go through diode 1, so the positive edge gets clipped to +0.7V. Negative edge can only go through diode 2, so negative edge gets clipped to -0.7V
http://i.imgur.com/Sx8MvpY.png

2. Positive edge of top waveform can go through top diode. Negative edge of top waveform cannot.
Positive edge of bottom waveform cannot go through bottom diode. Negative can.
Results in rectified wave form capped at 5.6V due to the Zener
http://i.imgur.com/XYa5e5H.png

3. Don't really know how this one works

4. The waveform for this would 'start' from 4.3V (5V - 0.7V) and get clipped at 12.74V (14.14V - 2x0.7V)
http://i.imgur.com/iTStF8O.png

5. The positive edge can go through the diode but the negative one cannot. What would the waveform look like?
http://i.imgur.com/DoMnqwM.png

Am I doing these questions right?
 

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  • #2
eehelp150 said:
1. Positive edge can only go through diode 1, so the positive edge gets clipped to +0.7V. Negative edge can only go through diode 2, so negative edge gets clipped to -0.7V
Check out this thread from the beginning.
https://www.physicsforums.com/posts/5590333/
 
  • #3
cnh1995 said:
Check out this thread from the beginning.
https://www.physicsforums.com/posts/5590333/
Then come back and let us know if there remain any unanswered questions, [emoji678].
 

1. How do I determine the voltage and current in a diode circuit?

The voltage and current in a diode circuit can be determined by using Ohm's Law and the characteristics of the diode. The voltage across the diode can be calculated by subtracting the voltage drop of the diode (typically 0.7V for silicon diodes) from the supply voltage. The current through the diode can be calculated by dividing the voltage across the diode by the resistance in the circuit. However, it is important to note that the current in a diode circuit is nonlinear and can only flow in one direction.

2. How do I plot the waveform generated by a diode circuit?

The waveform generated by a diode circuit can be plotted by using a graphing calculator or software, such as LTSpice. Simply input the voltage and current values calculated in the previous step into the software to generate a visual representation of the waveform. It is important to note that the waveform will vary depending on the type of diode used and the circuit configuration.

3. What is the difference between forward and reverse bias in a diode circuit?

In a diode circuit, forward bias refers to the direction of current flow through the diode where the anode is at a higher potential than the cathode. This allows for current to flow through the diode and for it to operate as a closed switch. On the other hand, reverse bias refers to the direction of current flow through the diode where the cathode is at a higher potential than the anode. This prevents current from flowing through the diode and causes it to operate as an open switch.

4. How do I calculate the power dissipation in a diode circuit?

The power dissipation in a diode circuit can be calculated by using the formula P=IV, where P is power, I is current, and V is voltage. This formula can be applied to both the diode and the resistor in the circuit to determine the power dissipation for each component. It is important to note that the power dissipation for a diode is typically much lower than that of a resistor due to the diode's nonlinear current flow.

5. Can I use Kirchhoff's Laws to analyze a diode circuit?

Yes, Kirchhoff's Laws can be used to analyze a diode circuit. Kirchhoff's Voltage Law (KVL) states that the sum of the voltages in a closed loop must equal zero. This can be applied to a diode circuit to determine the voltage drops across each component. Kirchhoff's Current Law (KCL) states that the sum of the currents entering and leaving a node must be equal. This can be applied to a diode circuit to determine the current flowing through each component.

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