該器件還集成了線性VREGS,支持50÷60 HZ - IEC62052-11, IEC62053-2X規(guī)范,誤差小于0.1%.本文介紹了STPM11/12/13/14的主要性能和方框圖,電表中有功能量計(jì)算圖, 電荷泵電路圖以及應(yīng)用電路圖.
STPM11/12/13/14 Single phase energy metering IC with pulsed output and digital calibration
主要性能:
Ripple free active energy pulsed output
Direct stepper counter drivers
Shunt, current transformer, Rogowsky coil sensors
Live and neutral monitoring (STPM13/14)
Easy and fast digital calibration at only one load point
No-load, negative power and tamper indicators
Integrated linear VREGS
RC (STPM11/13) or crystal oscillator (STPM12/14)
Support 50÷60 HZ - IEC62052-11, IEC62053-2X specification
Less than 0.1% error
概述:
The STPM1x family is designed for effective measurement of active energy in a power line system using a Rogowski Coil, Current Transformer and Shunt sensors. This device is
specifically designed to provide all the necessary features to implement a single phase energy
meter without any other active component. The STPM1x device family consists, essentially, of two parts: the analog part and the digital part. The former, is composed of a preamplifier and first order A/D converter blocks, band gap voltage reference, low drop voltage regulator. The digital part is composed of a system control, oscillator, hard wired DSP and interface for
calibration and configuration.
The calibration and configuration are done by OTP cells, that can be programmed through a
serial interface. The configured bits are used for testing, configuration and calibration purposes.
From two output signals coming from the analog section, a DSP unit computes the amount of consumed active energy. The active energy is available as a pulse frequency output and directly driven by a stepper counter. In the STPM1X an output signal with pulse frequency proportional to energy is generated. This signal is used in the calibration phase of the energy meter application allowing a very easy approach. When the device is fully configured and calibrated, a dedicated bit of OTP block can be written permanently in order to prevent accidental entry into test mode or changing any configuration bit.
圖1.方框圖
Fig2. 有功能量計(jì)算圖
Fig3. 電荷泵電路圖
Fig4. 應(yīng)用電路圖
