Complex Diode Circuit: Solve DC Output, Ripple, Rating & Power

• Engineering
• rx78
In summary, the conversation involves solving a power supply circuit problem with typical component values and diode forward drop of 0.6V each. The questions involve determining the DC output voltage under no load, the ripple amplitude when a current of 200mA is drawn from the supply, the current rating needed to keep the ripple below 1% of the output voltage, and the average power dissipated in the circuit with a given angular frequency. The approach involves converting the RMS voltage to peak-to-peak AC voltage, determining the output DC no-load value based on the AC p-p input and diode drops, and considering the behavior of the bridge circuit at positive and negative peak values.

Homework Statement

Consider the following power supply circuit, which uses typical component values. The
diodes have a forward drop of 0.6V each. Transformer voltages are RMS (root mean
square).

http://img294.imageshack.us/img294/1665/70454661.png [Broken]

a. Determine the DC output voltage under ‘no load’.
b. Determine the amplitude of the ripple when a current of 200mA is drawn from the
supply.
c. What should the current “rating” of the supply be, if the ripple (peak-to-peak)
must be kept below 1% of the output voltage?
d. Find the average power dissipated in the circuit assuming ω = 300 rad/s.

unsure...

The Attempt at a Solution

Honestly, I'm just not really sure where to actually -start- on this. We barely touched on this material in class and our text (Principles of Electronics Analog and Digital) is fairly lacking in any sort of examples to try to follow the logic. I just need some tips on how to approach this problem from a fundamental standpoint, really, so if you can just give some tips on how to start with it, I can probably carry on.

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rx78 said:

Homework Statement

Consider the following power supply circuit, which uses typical component values. The
diodes have a forward drop of 0.6V each. Transformer voltages are RMS (root mean
square).

http://img294.imageshack.us/img294/1665/70454661.png [Broken]

a. Determine the DC output voltage under ‘no load’.
b. Determine the amplitude of the ripple when a current of 200mA is drawn from the
supply.
c. What should the current “rating” of the supply be, if the ripple (peak-to-peak)
must be kept below 1% of the output voltage?
d. Find the average power dissipated in the circuit assuming ω = 300 rad/s.

unsure...

The Attempt at a Solution

Honestly, I'm just not really sure where to actually -start- on this. We barely touched on this material in class and our text (Principles of Electronics Analog and Digital) is fairly lacking in any sort of examples to try to follow the logic. I just need some tips on how to approach this problem from a fundamental standpoint, really, so if you can just give some tips on how to start with it, I can probably carry on.

First, convert the output RMS voltage number to a peak-to-peak AC voltage number. That is the input waveform to the bridge. Then figure out what the output DC no-load value would be -- it's related to the AC p-p input to the bridge, and to some number of diode drops. Picture what the bridge does when the AC waveform in is at it's positive peak value, and then at its negative peak value...

Last edited by a moderator:

1. What is a complex diode circuit?

A complex diode circuit is a circuit that includes multiple diodes and other electronic components to achieve a specific output or function. These circuits are often used in power supplies, voltage regulators, and rectifiers.

2. How do I solve for the DC output of a complex diode circuit?

The DC output of a complex diode circuit can be solved by analyzing the circuit using Kirchhoff's laws and Ohm's law. This involves calculating the voltage drops, current flows, and power dissipation of the circuit components. Simulation software can also be used to solve for the DC output.

3. What is ripple in a complex diode circuit?

Ripple in a complex diode circuit refers to the fluctuation or variation in the output voltage or current. It is a result of the alternating current (AC) input being converted to direct current (DC) output by the diodes. Ripple is undesirable and can be reduced by using smoothing capacitors or voltage regulators.

4. How is the rating of a complex diode circuit determined?

The rating of a complex diode circuit is determined by the maximum voltage and current that the circuit can handle without getting damaged. This rating is important to consider when designing a circuit to ensure that the components can handle the expected input and output levels.

5. What is the power dissipation in a complex diode circuit?

Power dissipation in a complex diode circuit refers to the energy that is lost as heat by the circuit components. This can be calculated by multiplying the voltage drop across a component by the current flowing through it. It is important to consider power dissipation to prevent overheating and damage to the components.