1.1 A supply draws power from the utility input and is designed to be 85% effici

Question

1.1 A supply draws power from the utility input and is designed to be 85% efficient. The maximum power output power it can supply to a load, without overheating, is 1.5 kW. In the same package size, if the energy efficiency of the power electronic converter within this power supply is improved to be 95%, what is the maximum output power that it can be loaded to? Hints: Since the size of the package in both cases is the same, assume that the maximum allowed power dissipation within this power supply, without overheating it, remains unchanged.

Explanation / Answer

Since the package is same in both cases so the maximum allowed power dissipation with supply without overheating remains unchanged.

Now,

When power supply is 85 % efficient it can supply maximumoutput power to aload is 1.5kW.

i.e, 85 % of total power supply = 1.5kW

Total power of power supply = 1.5 x 100/85

= 1.7647 kW

In second case

It's 95 % efficient. So, it can supply 95% of it's total power, without overheating

= 95/100 x 1.7647

= 1.6765 kW

So, the maximum power that it can be loaded to is 1.6765 kW.

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