For Reg 2 201504.pdf Q2 () Give one application of Power Electronics in each of
ID: 2291597 • Letter: F
Question
For Reg 2 201504.pdf Q2 () Give one application of Power Electronics in each of the following enginccring sectors: () Electrical, (i) Electronics, (ii) Acrospace, (iv) 151 (b) What is the purpose of a Snubber Circuit in Power Electronics? Name any Mechanical, and (v) Biomedical Engineering (c) The relay in Figure 02a has a coil rated at 10V DC and a resistance of 3000. What is the maximum current in a diode clamp placed across the relay's [4 contacts? relay switch ov Figure 02a (dy Find the RMS current for' the periodic waveform of Figure 02h 161 2 5105202530 190 94Explanation / Answer
(A)
(i)In electrical field power electronics are widely used for High voltage DC Transmission, Excitation systems, VAR compensation, Static circuit breakers, fans and boiler feed pumps, supplementary energy systems(solar, wind)
Due to the developments in power electronics field, the power transmission and distribution field faces tremendous changes such as HVDC transmission, Smart grid system. Conventional power transmission happens based on AC supply.
(ii)Improvement in power semi conductor fabrication and Power Integrated Module (PIM), Intelligent Power Modules (IPM)
Power electronics find various applications on the enhancement of the above in electronics industry
(iii)In Aerospace it is used for Space shuttle power supplies,Satellite power supplies,Aircraft power system for various components being operated there.
(iv)Mechanical engineering field fins a lot of applications for power electronics such as its use in modern transport
aircraft
cooling mechanism is advanced power electronics circuits etc.
(v) biomedical device consist of energy intake, analog-to-digital conversion, signal processing, and communication subsystems.
Advaneced sphygmomanometer is the best example in bio medical field.
(B)
The snubber is a circuit which snubs or limits the switching voltage amplitude and its rate of rise (dv/dt). Hence it reduces the power dissipation in power electronic switching networks.
These are placed across the various switching devices like transistors, thyristors, etc. Switching from ON to OFF state results the impedance of the device suddenly changes to the high value. But this allows a small current to flow through the switch. This induces a large voltage across the device. If this current reduced at faster rate more is the induced voltage across the device and also if the switch is not capable of withstanding this voltage the switch becomes burn out. So auxiliary path is needed to prevent this high induced voltage
Similarly when the transition is from OFF to ON state, due to uneven distribution of the current through the area of the switch overheating will takes place and eventually it will be burned. Here also snubber is necessary to reduce the current at starting by making an alternate path.
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