Two-Section Energy Meter Reference Design

The design includes a high-performance analogue entrance finish and an embedded programmable achieve amplifier, enhancing precision and cost-efficiency in power measurement.

As international power consumption rises, particularly within the residential sector, utility suppliers want extra exact and economical power metering options. The Kinetis M sequence two-phase electrical energy meter reference design from NXP Semiconductors meets this demand by that includes a high-performance analogue entrance finish paired with an embedded programmable achieve amplifier. This mix enhances the accuracy of power measurements, successfully addressing each precision and cost-efficiency wants.

The KM household includes 32-bit microcontrollers using 90nm Skinny Movie Storage (TFS) embedded flash expertise, tailor-made primarily for the metering markets. These units are designed for sensible single-phase power meters prevalent in India and China and two-phase meters used within the US, Japan, and Europe. The KM household adheres to metering requirements akin to EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23.

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These microcontrollers characteristic a 32-bit ARM Cortex M0+ core, together with an built-in Analog Entrance Finish (AFE). They provide CPU clock speeds of as much as 50 MHz. Key elements of the KM units embody a extremely correct Sigma Delta (SD) ADC, Programmable Acquire Amplifier (PGA), exact inner voltage reference, flash reminiscence, RAM, a part compensation logic block, and extra peripherals. The KM household additionally helps tamper detection and consists of an correct real-time clock in all fashions, enhancing safety and reliability in metering functions.

The design boasts a spread of options for strong and exact power measurement. It will possibly deal with currents as much as 200 A and operates throughout a voltage vary of 85 to 264 V at 50/60 Hz. Customers have the pliability of two set up choices: Type 2S or Type 12S. The machine adheres to the ANSI C12.20-2002 Class 0.2 accuracy class, making certain dependable measurements. Moreover, it features a line frequency measurement functionality for exact zero-cross detection and implements a present transformer sensing circuit for every part.

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For power conservation, the machine options low-power modes that leverage a built-in RTC with Li-battery backup. It additionally consists of an AMI growth header that helps 2.4 GHz 802.15.4 or HAN/NAN communications by way of 6loWPAN IPv6 for Superior Metering Infrastructure (AMI) and distant management functionalities. The design is EMC-proven in accordance with ANSI C62.41 and IEC 61000-4-4, enhancing its resilience to electromagnetic interference.

On the peripherals entrance, the machine is provided with an 8 x 20 phase LCD with a cost pump and LED pulse outputs for measuring kWh and kVARh. Connectivity choices embody an remoted (4 kV) RS-232 port for monitoring, parameterization, and firmware upgrades and an elective infrared optical port compliant with ANSI C12.18-2006, broadening its utility and ease of integration into numerous methods.

NXP has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further knowledge in regards to the reference design. To learn extra about this reference design, click on right here.