Shared 15V power supply

MacIntoshCZ

Active Member

• Aug 13, 2021

• #1

In most my projects i need 12V for gate drivers on primary side. I got an idea of building one shared 15V power supply. In "project device" - there will be 12V linear stabilizer with decoupling caps and one bigger cap for current spikes. I will be using twisted cables for powering those devices. What do you think about it? I hate creating 12V power supplies again and again.

 

Last edited: Aug 13, 2021

MacIntoshCZ

Active Member

• Aug 13, 2021

• #2

I am thinking about this for connections:

GM electronic | elektronické součástky, komponenty

Flex demo

www.gme.cz

GM electronic | elektronické součástky, komponenty

Flex demo

www.gme.cz

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Aug 13, 2021

• #3

A 5.5 / 2.1 mm or 5.5 / 2.5mm roca style connector such as those is pretty much standard on DC supplies around 12V - 15V.

You could stick to those as a standard then you could also use off-the-shelf PSUs, as they are often cheaper than buying parts. They are what I normally use on prototypes, one offs and test gear etc.
12V "CCTV" power units are very common.

eg.

CCTV Power Supply 12V 5A 60W ADAPTER Transformer for LED Light Strip DVR UK Plug | eBay

(5) Other 12V Devices (Not more than 60W). 1 x 12V 5A Power Adapter. (1) Famous Original Components & Stable Circuit Board. (2) 12V LED Modules. (5) Short Circuit Protection. (4) 12V LCD Monitors. (4) Overload Cut-off Automatically (Avoid Fire).

www.ebay.co.uk

 

MacIntoshCZ

Active Member

• Aug 13, 2021

• #4

Thanks. Do you think its better to have 12V DC out and just filtering caps in inputs/outputs or higher voltage which will be in final device stabilized to 12V?
I think second option is better. For noise and voltage stabilization.

 

rjenkinsgb

Well-Known Member

Most Helpful Member

• Aug 13, 2021

• #5

I'd stick with 12V direct. Linear regulators will be wasting a lot of power and producing heat, if you are using significant current - and switched mode ones will add noise and need filtering anyway.

I'd just use a reservoir cap and high frequency caps in the end device, if the load is pulsed.

 

MacIntoshCZ

Active Member

• Aug 13, 2021

• #6

OK thanks