What is a rectifier's purpose in elctronic circuits?

Question

Can you help me identify the three basic types of rectifiers, and what applications each one would be used for.

Answer 1

I wish I could see more of the context of the question, because there are several ways to answer it:

Answer 1 (different rectifier structures using diodes):
A. Half-wave rectifier -- used when regulation and ripple voltage of the DC output is non-critical
B. Full-wave rectifier -- used when a single DC voltage is required and the ripple specification is stricter.
C. Bridge rectifier -- also a full-wave recitifier, but both positive and neagtive DC voltages are generated.

Answer 2 (different types of rectifier diodes):
A. Standard silicon diode recitifier -- used for run-of-the-mill cheap power supplies (like wal-warts)
B. Fast recovery silicon diode rectifier -- used in switching power supplies with switching speeds above 100 kHz (and into the MHz regime)
C. Schottky diode rectifier -- used for high efficiency power supplies (because the forward voltage is very low for some of these diodes)

Answer 3 (different uses for diodes):
A. Diode power rectifier -- used to change AC to DC in power supplies
B. Diode detector -- used to change AM radio signals to audio signals in a radio receiver
C. Diode switch -- used in logic circuits and low power circuits to block DC in one direction and allow it to flow in the the other direction.

So, you see I would need more information to elaborate on these (depending on which answer best suits your question).

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Answer 2

The very purpose of the rectifier is to convert AC to steady DC.
The basic components used in the rectifier circuits are Transformer(step down) ,diodes, capacitors, inductors and resistors.
If only one diode is used it is called a half wave rectifier. Though it converts AC into DC , this DC will not be a perfect DC. because the bi-directional current is converted into a unidirectional, intermittant current. Of course this can be smoothened to certain extent by using suitable capacitors. or some other components.
At the same time , if two diodes are used
both the half cycles of the AC will be utilised to produce a better and more effective DC.This is called a full wave rectifier. To reduce the fluctuations, again suitable components of the appropriate value can be used in the filter circuit. Nowadays very efficient ICs are in the market in place of these components.

Answer 3

What Is A Rectifier Circuit

Answer 4

3 basic types:

1) Plain old rectifier diode, used to block current flow in one direction. Used in diode bridges in power supplies to make AC into DC. Has two ratings, Amps in the forward direction, and PIV or Peak Inverse Voltage, the highest voltage it will block in reverse. Exceeding either destroys the device.

2) Zener diode, a special kind of rectifier that acts like a regular diode, blocks current in one direction, unless the reverse voltage is higher than the Zener's reverse voltage rating (Zener voltage). It then maintains this voltage drop in the reverse direction and conducts any excess. This is called the "Avalanche" region of the diode and is useful for limiting voltages or creating a reference voltage.

3) Silicon-Controlled Rectifier or SCR, blocks current when reverse biased. When forward biased, it will not conduct until a signal is applied to the "Gate" input of the SCR. It then conducts until voltage drops to zero. Used in pairs, they can control AC current. The earlier you gate the SCRs while they're forward-biased, the more of the wave you let through. Useful for motor speed controls, voltage regulators for generators, etc.

Answer 5

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With an AC current the voltage varies from positive to negative (say +- 115 volts for US wall current). If you hooked it up to a oscilloscope it would look like a sine wave. True DC looks like a flat line. Devices that need DC voltage want that voltage to be steady. When you rectify AC through a bridge, the unfiltered voltage looks like AC only with all the negative arcs flipped to the positive side, so the potential bounces between the desired voltage and zero (picture the path of a bouncing ball). The capacitor smooths the current to more closely match true DC.

Answer 6

1 Half wave very basic single diode
2 Full wave 2 diodes
3 Bridge 4 diodes the best

Bear that in mind and read http://en.wikipedia.org/wiki/Rectifier for a complete explanation

Answer 7

A rectifier is an electrical device that converts alternating current to direct current, a process known as rectification. .

Voltage-doubling rectifiers
Half-wave rectification
Full-wave rectification

Answer 8

Change ac to dc

Answer 9

1. switch