What is different from the pulse diode rectifier

All modern electronic circuits are composed of diodes, only one applied pulse and the other rectifier diodes. Let us in this article will understand what their fundamental difference, because in both cases used P-N junction.

Signal Switching diodes

Pulses in converters occur in a very short time, therefore, to the diodes are in such schemes, put forward a special condition - the speed. That is the time of transition from the diode non-conducting state and vice versa should be minimal.

That is why part of the low-voltage circuits are widely used Schottky diodes.

A distinctive feature of the Schottky diode is the presence of a transition metal - semiconductor. Such a diode rectifier good effect at a relatively low transition capacitance (pF share). This means that the Schottky diodes can be operated in circuits where switching speed is measured in fractions of nanoseconds.

These parameters are achieved by reducing the area of ​​P-N junction, which affects the amount of power that can dissipate diode (30-40 mW).

Just undoubted advantage of such diodes is comparatively small the voltage drop across the P-N junction, which is approximately equal to 0.3 volts.

So, summing up the interim, we can conclude that in the Schottky diodes do not waste time on the accumulation and charge dissipation, the operating speed of the diode depends only on the speed of recharge low barrier capacity.

rectifier diodes

These diodes are not originally designed to work in pulse mode. Therefore, strict requirements for speed such products initially and does not extend.

Rectifier diodes are mainly used for transforming the low-frequency AC to DC or pulsating. In this case, just a small capacity is required P-N junction and the opening rate - closing and need a good conductivity (just because of the large Square P-N junction, wherein the junction capacitance can reach tens of pF) and small resistance (for long pass a large current value).

A classical example of the use of the diode rectifier is a diode bridge circuit.

conclusions

Summarizing all the above, we can draw the following conclusion: Pulsed diodes differ from rectifying the fact that the first order to improve performance, minimize area p-n junction. Due to this reduced capacity, and hence speed of opening - closing is very great.

This implies the following differences: Switching Diodes simply not physically able to dissipate a lot of power as opposed to the rectifier. A low reverse voltages emit pulsed diodes in separate diodes class. By the way, the Schottky diodes can be ordered here.

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