Characteristics of power semiconductor devices - rectifiers

Characteristics of power semiconductor devices - rectifiers

Uploaded by: Violet

On: 10 Jun, 2019

Viewed:249 times - 1 day, 11 hour, 50 minute, 21 second ago

Downloaded: 0 times -

Category: Circuit

Characteristics of power semiconductor devices - rectifiers Rating:
4
17 out of 100 based on 364 user ratings

Voltage and Current Rating -- Silicon-rectifier ratings are generally expressed in terms of reverse-voltage ratings and of mean-forward-current ratings in a half-wave circuit operating from a 60-hertz sinusoidal supply and into a ...

Voltage and Current Rating -- Silicon-rectifier ratings are generally expressed in terms of reverse-voltage ratings and of mean-forward-current ratings in a half-wave circuit operating from a 60-hertz sinusoidal supply and into a purely resistive load.


There are three reverse-voltage ratings of importance:


Peak transient reverse voltage VRM
Maximum repetitive reverse voltage Vrm(rep)
working peak reverse voltage Vrm(wkg)


Peak transient reverse voltage Vna is the rated maximum value of any nonrecurrent surge voltage, and this value must not be exceeded under any circumstances, even for a micorsecond. Maximum repetitive reverse voltage (Vrm(rep)) is the maximum value of the reverse voltage that may be applied recurrently, e.g. in every cycle, and will include any circuit oscillatory voltage that may appea on the sinusoidal supply voltage. Working peak rteverse voltage (Vrm(wkg)) is the crest value of the sinusoidal voltage of the supply at its maximum limit.


The manufacturer generally recommends a Vrm(wkg) that has an appreciable safety margin in relation to the Vrm to allow for the commonly experienced transient over-volatges on power mains.


Three forward-current ratings are similarly of importance:


Nonrecurrent surge currewnt Ifm(surge)
Repetitive peak forward current Ifm(rep)
Average forward current If(av)


Silicon diodes have comparatively small thermal mass, and care must be taken to ensure that short-term overload currents are limited. The nonrecurrent surge current is sometimes given as a single value that must not be exceeded at any time, but it is more generally given in the form of a graph of permissible surge current versus time. It is important to observe whethger the surge-current scale is marked in peak, rms, or average value in order that the data be correctly interpreted. The repetitive peak forward current is the peak value of the forward currnt reached in every cycle and excludes random peaks due to transients. Its relation to the average forward current depends on the circuit used and the load that is applied. For example, the repetitive peak is about three times the average for a half-wave or bridge circuit working into a resistive load; it may be many times greater when the same circuitsd works into capacities loads.

Related Posts

Solving problems commonly occur at Alternator and Regulator

How to determine the failure in an electrical system must through some steps. To get the best result to need to check and clean up all connections available in the electrical system before searchin...

How to repair comprehensive electrical vintage car

How to Easy Repairing Electrical Vintage car

Fixing electrical system for vintage cars easily and suddenly is my topic post today taken from trusted reference. Before we already posted abou...

Recognize 5 more important things in car electrical system

Based on the definition of electrical system or wiring diagram is a circuit that works use proper electricity by shifting electron from one power to another object for recent purpose. Better you kn...

There are Alternator Functions in Car Electrical Systems, Many people Don't Understand!

In the car electrical system, alternator had more importance function. Many people think battery as main source of car. The truth is battery only supply current electrical when engine starter on. &...

2000 Mercury Cougar Fuse Diagram

2000 Mercury Cougar Fuse Panel Diagram Wiring Forums 10/08/2017 · Looking for info regarding 2000 Mercury Cougar Fuse Panel Diagram...

How relay is works and simple wiring sample

In this occasion, lets learn about relay which we can found this tool in our electrical's automotive. How a relay works 12v? the relay works only use one circuit to switch on a second circuit.its m...

As the fastest growing demand of circuit and wiring diagram for automotive and electronics on internet based on different uses such as electronic hobbyists, students, technicians and engineers than we decided to provide free circuit and wiring diagram base on your needed.

To find circuit and wiring diagram now a day its easy. E-learning through internet as a right place to search an exact circuit and wiring diagram of your choice and it's much fun and knowledgable. On internet you will find thousands of electronic circuit diagrams some are very good designed and some are not. So you have to modify them to make them according to your needs but some circuits are ready to make and require no changes.

There are many categories of circuit and wiring diagrams like automotive, audio circuits, radio & RF circuits, power supply circuits, light circuits, telephone circuits, timer circuits, battery charger circuits etc. There are many types of circuit and wiring diagrams some are very easy to build and some are very complicated, some are so small and some contain huge list of parts.

We provides free best quality and good designed schematic diagrams our diagrams are free to use for all electronic hobbyists, students, technicians and engineers. We also provides a full educational system to students new to electronics. If you are new to electronics you are a student or a electronic hobbyist and want to increase your knowledge in electronics or want to understand electronics in a very easy way so this is the right place for you we provide electronics beginner guide tutorials to easily understand complicated electronic theory. Our mission is to help students and professionals in their field.