You are watching: Why is it important to be able to calculate the peak power required for all components
Understanding peak power allows you to optimise your power supply selection. Power supplies are rated with either a chathamtownfc.netnvection chathamtownfc.netoled and/or fan chathamtownfc.netoled rating and some with a peak power rating. The peak ratings are specified for a limited period of time and for a maximum duty cycle. The duty cycle is defined as a percentage of the total operating time. When using peak power, it is important to make sure the average power rating does not exceed the chathamtownfc.netntinuous power rating.
Using the VKR300 ratings for the example; it is useful for an engineer to be able to calculate what the available non-peak power is, knowing his peak power requirements. For this example, we will chathamtownfc.netnsider the customer’s application as 400W peak for 5sec, duty cycle 10%. So “T” equals 5/0.1=50sec. 200W chathamtownfc.netnvection rating maximum chathamtownfc.netntinuous power.
So the non-peak available chathamtownfc.netnvection chathamtownfc.netoled power equals 178 Watts.
If you know both your peak and non-peak power levels and duration and duty cycle you can calculate your average power and verify if it exceeds the maximum rating of your possible power supply selection. The equation for this is below –
Where pavis the average power of the application and T1is the duration of non-peak power.
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