Power sources-inverter type power sources, Mechanical Engineering

INVERTER TYPE POWER SOURCES

For site welding and repair applications, a need was felt for long time to have light weight arc welding power source. Even though, a petrol driven rotary converter is portable, the weight is considerable and it produces lot of noise and smoke. Where power connection is available a simple rectifier type may do the job but not always. For example, for remote and elevated level welding, it is highly inconvenient to drag heavy welding cables and the cost of long welding cables is also high. Therefore to avoid these problems a new type of power source has been developed. This is called inverter type. A schematic is shown in Fig.

The weight and size reduction is achieved by using a HF step down transformer, to produce necessary arc voltage. Transformer size and weight are inversely related to the frequency of operation. A Normal 50 Hz step down welding transformer is bulky and heavy because the frequency is low. If the frequency is increased to say 5 to 10 kHZ, then the transformer (made of ferrite cores) size and weight are drastically reduced. This is the principle behind inverter type power sources. Input voltage is directly rectified and is fed to a inverter circuit. The inverter circuit may be made of either thyristors or transistors. The inverter circuit generates HF AC  (5 to 10 kHz) and the voltage is step down by a HF transformer. The transformer output is rect ified to give DC output . The inverter circuit can be easily controlled in a closed loop manner to give the desired output characteristics.

 

83_inverter type.jpg

Posted Date: 9/14/2012 4:03:36 AM | Location : United States







Related Discussions:- Power sources-inverter type power sources, Assignment Help, Ask Question on Power sources-inverter type power sources, Get Answer, Expert's Help, Power sources-inverter type power sources Discussions

Write discussion on Power sources-inverter type power sources
Your posts are moderated
Related Questions
Q. Show drain systems used in plant? Process/power plants usually have a variety of different drain systems to collect the different types of liquid effluent. One of these is u

Elongation due to self weight of uniform tapered cone bar

boiler water hammering

Battery Inspection :  A fully charged and properly maintained battery is essential for proper lighting and starting of the motorcycle. STEPS Remove the right side cov

advantages and disadvantages of locomotive boilers

In an engine working on Diesel cycle inlet pressure and tem are 1 bar and 17 o c respectively. Pressure at the end of adiabatic compression is 35 bar. He ratio of expansion i.e. af

Temporary Stone Scuppers: In hill roads, it is customary to cut the roads from the hill-face and to open up the road immediately thereafter to traffic. Further improvements s

Derive the mathematical expression for temperature distribution for plane wall with internal heat generation when both the surfaces are at same temperature?

find degree of the bezier curve