More accurate readings of total energy with metering ICs
28 January 2004
Power Electronics / Power Management
Products & Solutions
Analog Devices' next-generation metering chips now measure 'reactive' energy for more precise readings of energy use. These new energy metering ICs - the ADE7753 and ADE7758 - are based on ADI's high-resolution ADC technologies combined with a fixed-function DSP. Reactive energy, caused by nonlinear loads, requires energy suppliers to supply more volt-amps to customers than they can measure with a conventional watt-hour (active energy) meter.
The DSP performs all the necessary energy measurement calculations, allowing a low-cost microprocessor to be used for data management and supervisory functions. This architecture simplifies meter designs that previously relied on microprocessors to perform complex computations. The reduction in extensive code development significantly reduces cost and time-to-market.
The ADE7758, which features second-order sigma-delta ADCs, is designed for mid-range 'three-phase' energy meters. For each phase, the chip measures reactive, active, and apparent energy; as well as rms voltage and rms current. These measurements are accessed via a serial interface that allows a fully automated digital calibration. The ADE7758 interfaces with a variety of sensors, including current transformers and di/dt current sensors, such as Rogowski coils. Like other products in the ADE family, the ADE7758 provides accurate active energy measurements with less than 0,1% gain error over a current dynamic range of 1000:1. Its reactive energy measurement also surpasses the Class 2 IEC61268 accuracy requirement of VAR-hr meters.
Key features of both chips include:
* Power line supervisory features, such as line period measurement, SAG, peak detection, peak level recording and missing zero-crossing.
* Zero-crossing detection.
* Active power no-load threshold, offset compensation and pulse output.
* Reactive power offset compensation and reactive power pulse output (ADE7758 only).
The ADE7758 consumes 70 mW, while the ADE7753, for 'single-phase' connections, consumes only 25 mW. Both devices are designed to operate over a temperature range of minus 40 to 85°C and require a single 5 V supply.
For more information contact Analog Data Products, a division of Avnet Kopp, 011 809 6100.
Further reading:
The role of bidirectional charging in the evolving energy landscape
Avnet Silica
Power Electronics / Power Management
As reliance on renewable sources like wind and solar continues to grow, the need for efficient energy flow and storage solutions has become more critical than ever.
Read more...
How to calculate a buck converter’s inductance
Power Electronics / Power Management
In the buck circuit, the inductor design is a key element that is closely related to system efficiency, the output voltage ripple, and loop stability.
Read more...
High-current EMI filters
Accutronics
Power Electronics / Power Management
TDK has introduced 20 and 40 A, 80 V DC board-mount EMI filters, reducing differential mode conducted emissions for switching power supplies with high input current requirements.
Read more...
Isolated SMD DC-DC converters
iCorp Technologies
Power Electronics / Power Management
MinMax has launched a series of isolated SMD DC-DC converters, the MSU01 series delivering 1 W, while the MSU02 series offers 2 W output.
Read more...
Secure, modernise and optimise CCTV
Surveillance Products & Solutions
Industrial and commercial organisations are navigating complex digital transformation processes. With SecuVue, companies can bridge the gap between operational technology and information technology for safer, smarter operations.
Read more...
Water mist for optimal fire suppression
Fire & Instrument Services
Fire & Safety Products & Solutions
Building owners, facility managers and other professionals are seeking fire suppression solutions that can meet the demands of modern buildings and facilities, including reduced water usage and environmental impact, while providing the necessary protection for assets and business operations.
Read more...
Smoke 'em out
Fire & Safety Products & Solutions
The moment an intrusion is detected, Smoke Screen’s high-powered fog cannons activate, flooding the area with a dense, harmless fog that reduces visibility to near zero within seconds.
Read more...
IoT innovation in water mist fire protection
Fire & Safety Products & Solutions IoT & Automation
Marioff, a provider of water mist fire protection, has introduced an Internet of Things (IoT) solution designed for high-pressure water mist systems, enabling real-time monitoring, smart alerts, and centralised control.
Read more...
Advanced fire safety solutions
Fire & Safety Products & Solutions
With fire incidents on the rise, it is crucial to choose fire safety solutions that are proven, reliable, and capable of providing early detection and efficient response.
Read more...
Next-gen power meter
Electrocomp Express
Power Electronics / Power Management
The VT-PWR-LV is a next-gen Vista Touch power meter from Trumeter for single, split, and three-phase systems.
Read more...