Maxim 78M6631三相电源功率测量和监测解决方案

2011年11月23日 18:54 发布者：1640190015

Maxim 公司的78M6631是三相电源功率测量和监测系统级芯片(SoC),集成了10MHz 8051兼容的MPU核,22位Delta-Sigma转换器和32位计算引擎(CE),支持三角型和Y型三相连接.2000:1电流范围内和整个温度内瓦特精度小于0.5%,超过IEC 62053/ANSI C12.20标准,基准电压温漂小于40 ppm/℃,具有高速SPI通信,主要用在建筑物自动化,数据中心,通信,存储电源和电源分配单元,马达运行和风细雨太阳能逆变器.本文介绍了78M6631主要特性, 78M6631评估板主要特性以及在三相四线和三相三线连接的应用框图,评估板电路图和材料清单,PCB布局图.

78M6631:3-Phase Power Measurement and Monitoring SoC

The 78M6631 is a highly integrated, 3-phase power measurement and monitoring SoC with a 10MHz, 8051-compatible MPU core and Teridian’s Single Converter Technology® containing a 22-bit delta-sigma converter and 32-bit compute engine (CE). The 78M6631 has been designed specifically for a wide variety of applications requiring 3-phase power and quality measurements. It supports both Delta and Wye configurations.

At the measurement interface, the device provides six analog inputs including three differential current and three voltage for interfacing to current and voltage sensors. The integrated MPU core and 128KB of flash memory provide a flexible means of configuration, post-processing, data formatting, interfacing to host processor through a UART or SPI™ interface, or using DIO pins for LEDs or relay control. All firmware is preloaded during manufacturing test.

78M6631主要特性:

< 0.5% Watt Accuracy Over 2000:1 Current Range and Over Temperature

Exceeds IEC 62053/ANSI C12.20 Standards

Voltage Reference < 40 ppm/℃

Six Analog Inputs Supporting 3-Phase Voltage and Current Measurement Inputs

Pin- or Bi-Selectable Delta or Wye Configuration

22-Bit Delta-Sigma ADC with Independent 32-Bit Compute Engine (CE)

8-Bit MPU (80515), One Clock Cycle per Instruction with 4KB MPU XRAM

128KB Flash with Security

32kHz Time Base with Hardware Watchdog Timer

UART, I²C, and High-Speed Slave SPI Host Interface Options

17 General-Purpose 5V Tolerant I/O Pins

Packaged in a RoHS-Compliant (6/6) Lead-Free 56-Pin TQFN

Application Firmware Includes (per Phase):

True RMS Current and Voltage Calculations

Active, Reactive, Apparent, Fundamental, and Harmonic Power Calculations

Fundamental and Harmonic Current and Voltage Calculations

Line Frequency and Power Factor Calculations

Phase Compensation (±18° at 60Hz)

Built-In Calibration Routines

Programmable Alarm Thresholds

Command Line (UART) Communications

High-Speed SPI Communications

78M6631应用:

Building Automation

Data Center, Telecom, Storage Power Supplies, and Power Distribution Units

Motor Health

Solar Inverters

78M6631评估板

The Teridian™ 78M6631 Evaluation Board is an electrical measurement unit for performing measurements on a 3-phase AC system. It incorporates the 78M6631 power and energy measurement device and connects to a PC through a USB cable such as the one provided in the demo kit. The Evaluation Board demonstrates the capability of the 78M6631 energy meter controller chip for measurement accuracy and overall system use.

The on-board 78M6631 is pre-programmed with the Firmware Demo Code.

The 78M6631 energy measurement data and status is read back over the serial UART interface using a text-based CLI command set (easy manual operation is performed using HyperTerminal) and through the serial peripheral interface (SPI).

图1.78M6631评估板外形图

The 78M6631 Evaluation Board Demo Kit includes:

• 78M6631 Evaluation Board

• USB Cable Assembly USB A-B 28/24 1.8M (Tyco/Amp 1487588-3)

• In-Circuit Emulator (ICE) Adaptor

• Three CTs

• CD with documentation