Single-phase energy metering ICs

8 August 2007 Power Electronics / Power Management

The STPM1x family from STMicroelectronics is a series of energy-metering ICs that incorporate all of the core circuitry necessary to implement a complete meter system, without requiring any other active component. By measuring active energy as pulse frequency output and featuring fast digital calibration, these ICs provide electronic meter manufacturers with a complete, cost-effective series of power-metering chips specifically designed for low-end applications. Fully compliant with specifications for single-phase, class 0.5 static meters, these devices provide fast and easy digital calibration at only one point over the whole current range, which allows a reduction in manufacturing costs when compared to hardware calibration made using a resistor network. The mixed-signal IC is designed for effective measurement of active energy in a power-line system using a wide variety of current sensors such as shunts, current transformers, and Rogowsky coils.

Analog blocks within the STPM1x include preamplifiers for signal conditioning, analog-to-digital converters, and low-drop voltage regulators to supply the circuitry. In the digital part of the device, the hardwired digital signal processor (DSP) uses innovative, ripple-free computation algorithms to calculate the amount of consumed active energy, thus reducing the meter's calibration time.

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