Power Electronics

Advantages and Disadvantages of Induction Heating Advantages of Induction Heating : Due to skin effect of induction currents the heat can be confined to the surface of the object. Hence induction heating is useful in surface hardening of steel. Very large heating ratio of the order of 5 kW/ cm² can be achieved. Controlled heating of the … Read more

Block Diagram of Induction Heating The block diagram of induction heating consists of high frequency AC source, the work coil, reset timer and the metal object or work-piece to be heated. The high frequency RF source provides alternating current to the work coil. Different parameters of the source such as voltage, current and frequency are … Read more

Various Methods of Heating Heating of the material can be carried out by using different methods. Out of all these methods electrical heating method is most convenient and clear method. The heat can be controlled accurately so electrical heating is widely used in many industrial applications. In electrical heating electrical energy is converted into heat … Read more

Induction Heating What is Concept of Induction Heating : Induction heating is one of the most widely used electrical heating methods in industrial applications. Generally it is applicable for many heating processes of the metals because it works on eddy current generation principle. In this method high frequency AC supply is used so it becomes … Read more

Radio Frequency (RF) Heating Definition of Radio Frequency (RF) Heating : Radio frequency heating is a type of high frequency heating in which the frequencies of operation range from hundreds of kilohertz to tens of megahertz; and is basically dependent upon the heating effect of alternating current. Types of Radio Frequency (RF) Heating : RF heating is classified … Read more

Advantages of Electric Heating For various industrial and domestic heating requirements, electrical heating appliances are found most suitable due to many reasons. The reasons are as under. Electrical heating processes are clean due to absence of smokes, ash, dust etc. As flue gases are absent in the heating processes, there is no risk of any … Read more

Static Switch Using Triac Circuit Diagram of Static Switch Using Triac : Instead of using inverse parallel SCRs, we can use the Triac, as a static switch as shown in Figure A. Being a bidirectional device it can be used for connecting the load current in both the half cycles of ac supply. Figure A Waveforms for … Read more

Comparison of Circulating and Noncirculating Modes in Converter Sr. No. Parameter Noncirculating current mode Circulating current mode 1. Number of converters ON simultaneously. Only one either P or N Both P and N 2. Interconverter circulating current Absent Present 3. Power dissipation in the reactor L Low High 4. Efficiency High Low 5. Dynamic response Slow … Read more

Single Phase Half Bridge Cycloconverter in Circulating Current Mode Working of Single Phase Half Bridge Cycloconverter in Circulating Current Mode In the circulating current mode both the bridges conduct simultaneously. In order to avoid short circuit on the ac supply the reactor L is placed between them as shown in Figure. It is not possible to connect … Read more

Applications of Industrial Applications of Power Devices In Uninterruptable Power Supplies (UPS). In the explosive atmosphere such as chemical plants, mines where sparking associated with the mechanical/ electromechanical switches is dangerous. Aircraft power control. Traffic signal control.