Jump to content

70W consumption with 5V 8A AC/DC Power Adapter


JavaLaurence

Recommended Posts

Hi,

 

I've got the following hooked up to a Watt meter: a Tinkerforge 8A AC/DC Power Adapter, a Tinkerforge 50-LED strip, a Brick and LED Strip, and a Raspberry Pi B to run my logic.

 

The Watt meter indicates a 69-70W consumption (I'm animating the LEDs somewhat, so their brightness varies).

 

Even when all LEDs are dark, I'm getting 67-68W.

 

What is consuming this? Neither the Tinkerforge nor Raspberry consume more than a few Watts... and dark LEDs ..?

 

Does the power adapter itself consume anything?

 

Thx for any insights.

 

Link to comment
Share on other sites

The 5V 8A AC/DC Power Adapter is a switched-mode power supply. I would guess that your watt meter is not able to measure switching power supplies correctly.

 

Waveforms for switched-mode power supplies as used for much electronic equipment may be very far from sinusoidal' date=' leading to unknown and possibly large errors at any power. This may not be specified in the meter's manual.[/quote']
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...