How to Analyse a Diode Circuit: Understanding Voltage and Current Relationships

In summary, To analyze a diode circuit, you need to consider the circuit with the diode on (short circuit) and off (open circuit). Assuming the diode is Silicon, there will be about 0.6 volts across it for smallish currents. This 0.6 volts will change slightly, but for the purpose of analysis, it can be considered constant. The voltage across the resistor can then be calculated by subtracting 0.6 volts from the total voltage (10 volts in this case). Using Ohm's law, the current through the resistor can be determined. It is important to note that even if a slightly different voltage is assumed for the diode, the current through the resistor will not be significantly affected
  • #1
tigertan
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I'm a quite confused as to how to analysie a diode circuit

How would I go about analysing the following? I know that I need to analyse the circuit with the diode on(short circuit) and off(open circuit).
 

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  • #2
If you assume the diode is Silicon, you can assume about 0.6 volts will appear across it for smallish currents.

This changes, but it is near enough for this analysis.

OK say there is 0.6 volts across the diode, then there must be 9.4 volts across the resistor.

(10 volts minus 0.6 volts = 9.4 volts)

Now a 2.7 K resistor with 9.4 volts across it must be carrying a current of about 3.48 mA. 9 V / 2700 ohms = 3.48 mA.

Notice that even though we assumed 0.6 volts for the diode voltage, it would not have made much difference if we had assumed 0.5 volts or 0.7 volts. 9.5/2700 = 3.5 mA. 9.3/2700 = 3.44 mA
 

1. What is a diode circuit?

A diode circuit is an electrical circuit that contains a diode, which is an electronic component that allows current to flow in only one direction. It is commonly used to convert AC (alternating current) to DC (direct current) in electronic devices.

2. How do you analyze a diode circuit?

To analyze a diode circuit, you can use the diode equation, which relates the current through a diode to the voltage across it. You also need to consider the diode's characteristics, such as its forward voltage drop and reverse leakage current.

3. What is the purpose of a diode in a circuit?

The main purpose of a diode in a circuit is to control the direction of current flow. It allows current to flow in one direction and blocks it from flowing in the opposite direction. This is useful in rectifying AC signals to DC, protecting circuits from reverse current, and many other applications.

4. What are the types of diode circuits?

There are several types of diode circuits, including the half-wave rectifier, full-wave rectifier, voltage multiplier, clamping circuit, and peak detector. Each type has a specific function and can be used in different electronic devices depending on the desired outcome.

5. What are some common problems when analyzing a diode circuit?

Some common problems when analyzing a diode circuit include incorrect assumptions about the diode's characteristics, not considering the effects of temperature on the diode, and not accounting for parasitic elements in the circuit. It is important to carefully consider all components and factors when analyzing a diode circuit to ensure accurate results.

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