Painlessly adding a power meter to a high volume consumer device ...

As the cost of domestic electrical power continues to increase, understanding electrical power usage becomes of more interest to the consumer. Accordingly, an additional $5 - $10 for a power connection product with built in power measurement may allow consumers to more effectively use power, and hence make significant savings in utility bills.

Power measurement may also be considered to be a novel feature to drive sales of extension cords etc.

The OTX103 is a low cost, line power measurement design for consumer applications. It is designed to be included in any product with a perceived value in knowing the true RMS power, voltage, energy being consumed. Also the total cost of the energy consumed.

click for component side

Design Features 

• For use with 3.5 digit 7 segment LCD's.
• 1W sensitivity / 2KW maximum power in typical application.
• True RMS measurement. Accurate power measurement of non-linear loads (such as TV's, stereo's etc).
• 2% + 2W accuracy.
• Works with 50Hz or 60Hz line frequencies.
• Works with 100V - 250V line voltages.
• Patented noise rejection, auto zeroing and auto-ranging systems.
• Off-line power with minimal components.
• Low cost total BOM.
• Backed by support services: feature customization, board customization, volume production test etc.

Design Deliverables

• Prototype boards with layout source files.
• Schematic files.
• BOM lists.
• Volume testing and calibration IP.
• Microcontroller source and object code view.
• Rights to manufacture etc.
• Custom LCD design per requested features.

• Consumer extension leads.
• Stand alone consumer power measurement units.
• Built into high end wall sockets etc.
• Integration into consumer and industrial electrical products.

Typical Application