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I want to design a Power Supply Unit(PSU) for Raspbery Pi Zero W. I will have a camera https://www.raspberrypi.org/products/camera-module-v2 connected and running, two relays and few gpio's running.

Camera Consumes around 250mA, RPi idle mode 150mA.

I read here https://www.raspberrypi.org/help/faqs/#power it states Recommended PSU to be 1.2A I can design 5V 1A PSU, will it be sufficient? How to calculate power consumption?

I have read these before but still unclear

Power consumption of Pi Zero W?

https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-power

If not, could you please share some PSU reference design with inrush | surge protection for 1.2A?

  • I do not understand how you can design a PSU without knowing the characteristics of the input power. – joan May 31 '18 at 12:34
  • I am really sorry I want to ask how to calculate input power consumption? As recommended by Raspberry Pi, what is Recommended PSU current capacity? How do they recommend then? – Alan May 31 '18 at 12:42
  • You misunderstand. How can you design a PSU without knowing the input voltage and whether it is DC or AC etc? – joan May 31 '18 at 12:46
  • I will be using 220V 50Hz AC source as a power supply – Alan May 31 '18 at 12:51
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How to calculate power consumption?

You sum all parts that consumes power, example:

- Raspberry Pi Z W  230 mA
- Camera            250 mA
- Relay x 2         xxx mA
                    -----
                    xxx mA

and so on.

The us addition to get the sum of all consumers and that will be the minimum current needed for a PSU. And off course add some leeway

Reference : http://raspi.tv/2017/how-much-power-does-pi-zero-w-use

If not, could you please share some PSU reference design with inrush | surge protection for 1.2A?

This is a question for "SE Electrical Engineering".

  • Please mark this answer as the answer to your question, if you found it useful. – MatsK Jul 10 '18 at 9:01

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