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
Transverse Electric Field Consider a charged particle (e.g. an electron) moving along  X-axis  with constant velocity  v ,  i . At  x = 0 , it enters into a region where a unif

Evaluate stress in fibre: Example, the matrix material can be stressed to its full strength of 80 MPa, calculate the allowable % of broken fibres. What will be the stress in f

Thin uniform wire bent - centre of gravity: Find out the C. G. of the thin uniform wire bent into shape ABC as illustrated in Figure. Solution Assume G be the loc

Calculate the tension T in the rope: Q: A man raises 10 Kg joist of length 4m by pulling on rope, Find out the tension T in the rope and reaction at point A for the posit

The following steps are taken to decarbonise the engine : Remove the exhaust muffler. Disconnect the spark plug. Remove the intake pipe bolt. Loosen the bolt de


Examine the CNC machines at University of Greenwich. You are needed to present and discuss about the major functional units and vital machine elements of  the CNC milling at Univer

Strength of spot welding Because spot welding has generally replaced riveting in many applications, it is reasonable to compare these two processes for strength. Often, riveted

Find out power transmitted by belt: A belt is running over pulley of 1.5m diameters at 250RPM. The angle of contact is 120º and coefficient of friction is 0.30. If maximum te

• IGF Vessel SH: CS + 1.6 mm CA + Internal Coating Eductor: 304L SS or alternatively, 12Cr • ORF Vessel SH: CS + 1.6mm CA + Internal Coating Mixer: 316L SS • Skim Oil T