DIODE RECTIFIERS

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The characteristic of the semiconductor diode, of being crossed from the current electrical worker in a sense rather than the other, comes wide taken advantage of, in many devices electronic you, in order to transform the variable currents in unidirectional currents, that conserves always the same one towards of movement, therefore as happens in a fed circuit to battery.
A time, before the advent of the semiconductors, a such task came entrusted to the valve electron-beam to two electrodes, anode and cathode, called "diode valve". Today, instead, the alternating current, derived from the net-light, comes rectified by means of the employment of or more semiconductor diode valves, opportunely connects to you between they, that they realize the so-called bridge rectifier. The which ago integrating part of the stage local p0wer source of every receiver radio or other electronic apparatus working with the alternated tension of net.
In this center, therefore, they come examines all wings to you practical effects, provokes to us to you from the presence of the semiconductor diode valves in the circuits interested from variable currents.

RECTIFICATION EFFECT

The theoretical circuit experiences them of figure 1 also comes proposed, in the versione practical constructive, figure 2. In it it makes use of a transformer of tension (T1) for door-bells electrical workers of domestic use, with 12 primary winding to 220 V and secondary to V. This member is reperibile normally near the storees of material electrical workers and can be endowed, on the secondary one, of taken intermediate for a various value of tension, as indicated in figure 2; in such case the tension of 12 Vca goes captured from the two extreme clips.
The diode valve rectifier to the D1 silicon is of type 1N4004, while two light bulbs LP1 - LP2 are from 12 V - 100 but.

Fig. 1 - Circuit according to experiences them of application of the semiconductor diode valve rectifying element. The presence of the electrolytic condenser C1 exalts the brightness of light bulb LP2. On the right is brought back the relative diagrams you to the present tensions in the main points circuita them.

The experiment consists in making to at first work the circuit without the insertion of the electrolytic condenser C1 and, in according to time, with the presence of this member. Well, once inserted the thorn in one whichever take-light, will notice to us that light bulb LP1, also being of the same type of LP2, emits one amount of greater light of this last one. But that, if account of the effect introduced from the semiconductor diode valve is kept D 1, is easy intuitable. In fact, light bulb LP1 comes crossed from the entire alternating current promoted from the secondary winding of T1, while the LP2 remains been involved from the sun positive semi waves of this, giacché those negatives, imbattendosi in the anode of the diode valve D 1 (to), finds in this an insurmountable obstacle, that is one arrest barrier. We conclude therefore saying that LP 1 ago more light why is crossed from the positive and negative semi waves, LP2 makes little light because it is crossed from the sun positive semi waves of the alternating current, because of the presence in the circuit of diode valve D1 the semiconductor. Which automatic rifle, closed for the negative semi waves, opened is behaved nearly like a switch for those positive ones.

Fig. 2 - Practical realization of the circuit experiences them that it clearly demonstrates to the functions electrical workers of the semiconductor diode valve. In constructive center it is recommended to insert the diode valve correctly and the condenser, holding account of the precise positions of finishes them of these members.

 

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