Designing of a PWM based variable voltage regulator(input 220VAC output 3-5VDC) for medical light source.

Er.Sarbottam Sapkota · Mar 4, 2020

Hello friends,I am planning to design a PWM based variable regulated voltage power supply for medical light source.The input for the light sourvce will be 220VAC and the output will be 3-5 VDC.Also i am planning to embed the microcontroller to display the brightness level of the light thus producedin LCD Display of & segment Display.
Hope you will help me in designing this.

Pommie · Mar 4, 2020

Most countries have very strict rules on any medical device that's connected to the mains. For this reason, medical grade supplies are available and should be used.

Mike.

Arch angel · Mar 5, 2020

Er.Sarbottam Sapkota said:
will be 220VAC and the output will be 3-5 VDC.Also i am planning to embed the microcontroller to display the brightness level of the light thus producedin LCD Display of & segment Display

That is confusing please clarify

Diver300 · Mar 5, 2020

There are lots of designs of 5 V power supplies that have 220 V ac input. I suggest that you use one of those, and put a PWM control between the 5V output of the power supply and the light source.

What is the maximum current that the light source takes?

Er.Sarbottam Sapkota · Mar 5, 2020

the total current will be 10 A(Max)

ronsimpson · Mar 5, 2020

Arch angel said:
That is confusing please clarify

When building a power supply there must be insulation from power line to person. For medical use the isolation is larger.
This is for the power supply and the plastic case.

Diver300 · Mar 5, 2020

Er.Sarbottam Sapkota said:
the total current will be 10 A(Max)

The design of a 10 A, 5 V power supply isn't easy. It would be far easier and far cheaper to buy something like this:-
https://uk.farnell.com/xp-power/ecm60us05/power-supply-ac-dc-medical-5v/dp/1176962 and then have a device on the output to produce the PWM

Are you sure about the 10 A? Most lights are LEDs, and 50 W of LEDs is a lot.

Pommie · Mar 5, 2020

To do a 50W isolated power supply for medical purposes requires a good level of expertise and various levels of certification. I doubt you have that level of experience, just buy an adequately specified supply and be safe.

Mike.

Designing of a PWM based variable voltage regulator(input 220VAC output 3-5VDC) for medical light source.

Er.Sarbottam Sapkota

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Er.Sarbottam Sapkota

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