Advantages of precision rectifier over conventional rectifier
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1. It is basically rectifier circuit, which converts an ac voltage to dc voltage.
2. Then Why it is called as ‘Precision Rectifier’? Because it generates accurate output which is missing in normal rectifier circuit or power-supply rectifier circuit (rectifier circuit using diode).
If you don’t know what is a normal rectifier circuit, please visit the link below and watch the video on ‘Rectifier Circuit Design’.
3. Now we have to understand what we mean by accurate output. If you already watched the video on ‘Rectifier Circuit Design’, you will know from both theoretical and practical analysis, we have observed that for practical diode there is a voltage drop (Vd). It varies from 0.4 V to 0.7 V (approximately). This voltage drop effects the output voltage significantly. Sometimes output voltage increases or decreases from the desired level for this voltage drop. But it is not the case for Precision Rectifier. It generates accurate desired output. Thus, how it got it name.
4. Now we will learn how this rectifier generates accurate output. This rectifier uses ‘Super Diode’. A ‘Super Diode’ is a circuit combination of Op amp and diode. Diode rectifies the input, generates the output and OP amp reduces the voltage drop of diode (Vd) to zero (approximately). Thus, basically it works and generates the accurate output.
For more details on operating principal, theoretical and practical analysis of Precision rectifier, please visit the link below and watch the video on ‘Precision Rectifier Circuit Design
2. Then Why it is called as ‘Precision Rectifier’? Because it generates accurate output which is missing in normal rectifier circuit or power-supply rectifier circuit (rectifier circuit using diode).
If you don’t know what is a normal rectifier circuit, please visit the link below and watch the video on ‘Rectifier Circuit Design’.
3. Now we have to understand what we mean by accurate output. If you already watched the video on ‘Rectifier Circuit Design’, you will know from both theoretical and practical analysis, we have observed that for practical diode there is a voltage drop (Vd). It varies from 0.4 V to 0.7 V (approximately). This voltage drop effects the output voltage significantly. Sometimes output voltage increases or decreases from the desired level for this voltage drop. But it is not the case for Precision Rectifier. It generates accurate desired output. Thus, how it got it name.
4. Now we will learn how this rectifier generates accurate output. This rectifier uses ‘Super Diode’. A ‘Super Diode’ is a circuit combination of Op amp and diode. Diode rectifies the input, generates the output and OP amp reduces the voltage drop of diode (Vd) to zero (approximately). Thus, basically it works and generates the accurate output.
For more details on operating principal, theoretical and practical analysis of Precision rectifier, please visit the link below and watch the video on ‘Precision Rectifier Circuit Design
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