"One week's work on Analog Electronics" - diodes

《 One week to finish the mold electricity 》- diode

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Preface

Tips ： Here you can add the general content to be recorded in this article ：
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This series of articles will use multisim Conduct simulation , The software installs itself .

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One 、 What is a diode ？

Diodes are made of semiconductor materials ( silicon 、 selenium 、 Germanium, etc ) An electronic device made of .
The main features ： Unidirectional continuity 、 Volt ampere characteristics .

Simulation circuit diagram ：

There will be a voltage drop after the diode is turned on , Common diodes are generally 0.7V, The LED is generally 1-2V, The conduction current range of LED is 5-20mV.
The diode does not conduct in the reverse direction , But the applied voltage exceeds Reverse breakdown voltage , The diode turns on ,（ Be careful that the diode does not exceed the maximum reverse voltage , Prevent the diode from burning out ）.

The following figure for 1N4148 The data book for , The reverse peak voltage of the diode is 100V, The reverse breakdown voltage is 75V.

Two 、 Zener diode

Voltage stabilization conditions ： 1、 Working in Reverse breakdown state 2、 The reverse voltage is greater than Stabilized voltage

The volt ampere characteristic curve of diode is shown in the figure below ：

The basic circuit of the zener diode is ： The resistor is connected in series with the zener diode .
From the volt ampere characteristic curve , The zener diode has a current limiting condition , Generally, the best regulated current condition is 4mA-8mA.
Simulation diagram ：

The following figure for MM3ZxxxT1G Important parameters of series stabilized voltage diode ：
The best regulated current of this series of Zener diodes is 5mA

1、 The use form of Zener diode is that the resistor and zener diode are connected in series ;
2、 Pay attention to the selection of regulated current
3、 Pay attention to the selection of series resistance in the circuit

Different positions of Zener diode and resistor in series affect the output waveform of the circuit .
Zener diode outputs waveform in branch ：

The output waveform of Zener diode in the main circuit is ：

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Rectifier diode

Use the forward conductivity of the diode , Rectify the AC signal .

Switching diodes

The switching diode has a short time of on and off state switching , In the circuit, it mainly prevents the reverse current from burning out the precision instrument , rise Protection .