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[原创] TI AMC1304智能电网电流电压检测方案

关键词:电源管理 智能电网 Delta-Sigma (ΔΣ)调制器 AMC1304

时间:2015-06-11 09:43:40       作者:TI        来源:中电网

TI公司的AMC1304是精密Delta-Sigma (ΔΣ)调制器,输出和输入通过容性绝缘层隔离,满足UL1577和VDE V-0884-10标准,隔离电压高达7000 VPEAK输入电压测量范围±50-mV或 ±250-mV ,CMOS或LVDS数字接口,主要用于工业马达驱动,光伏逆变器和能量电表.本文介绍了AMC1304主要特性,简化电路图,以及电流检测单元TIDA-00080主要特性,绝缘电流/电压模块(ICVM)和滤波器模块(FMB)系统框图,电路图,材料清单和PCB设计图.

The AMC1304 family are precision, delta-sigma (ΔΣ) modulators with the output separated from the input circuitry by a capacitive isolation barrier that is highly resistant to magnetic interference. This barrier is certified to provide reinforced isolation of up to 7000 VPEAK according to the UL1577 and VDE V-0884-10 standards. Used in conjunction with isolated power supplies, the device prevents noise currents on a high common-mode voltage line from entering the local ground and interfering with or damaging sensitive circuitry.

The input of the AMC1304 is optimized for direct connection to shunt resistors or other low voltage level signal sources. The unique low input voltage range of the device allows significant reduction of the power dissipation through the shunt while supporting excellent ac and dc performance. When used with an appropriate external digital filter, the device can be used to achieve 16 bits of resolution with a dynamic range of 76 dB (AMC1304x05) at 78 kSPS.

On the high-side, the modulator is supplied with an integrated LDO regulator that allows an unregulated voltage to be applied between 4 V and 18 V. The isolated digital interface operates from a 3.0-V to 5.5-V supply (DVDD).

The AMC1304 is available in a wide-body SOIC-16 (DW) package and is specified from –40℃ to 125℃.

AMC1304主要特性:

Pin-Compatible Family Optimized for Shunt Resistor Based Current Measurements:
±50-mV or ±250-mV Input Voltage Ranges
CMOS or LVDS Digital Interface Options
Excellent DC Performance Supporting High-Precision Sensing on System Level:
Offset Error: ±40 µV or ±150 µV (max)
Offset Drift: 1.3 µV/℃ (max)
Gain Error: ±0.5% (max)
Gain Error Drift: ±40 ppm/℃ (max)
Certified Isolation Barrier:
Reinforced Isolation Rating
VDE V-0884-10, UL1577, and cUL Approved
Isolation Voltages: 7000 VPEAK, 10 kVSURGE
Working Voltages: 1.5 kVDC, 1.0 kVAC, rms
Transient Immunity: 15 kV/µs (min)
High Electromagnetic Field Immunity
(see Application Note SLLA181A)
External 5-MHz to 20-MHz Clock Input for
Easier System-Level Synchronization
LDO Regulator with up to 18-V Input Voltage Range
Fully Specified Over the Extended Industrial Temperature Range

AMC1304应用:

Industrial Motor Drives
Photovoltaic Inverters
Energy Metering


图1.AMC1304简化电路图

Shunt-Based AC/DC Current and Voltage Sensing for Smart Grid Applications with Reinforced Isolation (ACTIVE) TIDA-00080.

This isolated shunt based current measurement unit enables high accuracy current measurement without the use of Current Transformers (CT). The isolation is achieved through the use of AMC1304 that incorporates both high voltage isolation as well as the Delta-Sigma Modulator. This solution eliminates the need for the CT which customers value due to the decrease in board size, reduced product weight, mitigation of cross talk and EMI in the system, and potentially increases product life through lower mechanical issues by replacing the CT with a shunt.

电流检测单元TIDA-00080主要特性:

High accuracy current/voltage measurement capability
0.25% from 0.5A to 10A
1% from 10A to 200A
Eliminate the CT for current sensing
Mitigates cross talk and EMI in system
Extend product field life (reduce mechanical issues) and shrinks board size

图2.电流检测单元TIDA-00080外形图

TIDA-00080 Isolated Shunt based Current Sensing Module with Delta-Sigma Modulators Reference Design - Top View
电流检测单元TIDA-00080特性应用:
• Protection Relays and IEDs
• Polyphase Energy Meters


图3.电流检测单元TIDA-00080板布局图

图4.绝缘电流/电压模块(ICVM)和滤波器模块(FMB)系统框图

The FMB has to be connected to the ICVM for processing the modulator output and providing power, clock, and SPI signals.

The FMB consists of the following major blocks:

• TPS55340RTE-based flyback converter to generate 6 V from 24-V input
• LP38798SD-ADJ/NOPB to convert 6 V to 5 V
• TPS54232D to generate 3.3 V from 5 V
• SPD08-120-L-RB connector for TMS320F28377-based module
• CDCE906PW, a programmable 3-PLL clock synthesizer, multiplier, and divider to generate the clockfor the ΔΣ modulator
• Interface connector to connect to the ICVM

图5.FMB子系统框图

图6.Delfino FMB外形图

The Delfino F28377D control card (TMDXCNCD28377D) from TI is used for digital filtering. This 180-pincontrol card provides a well-filtered robust design capable of working in most industrial environments.

F28377D控制卡TMDXCNCD28377D主要特性:

• Delfino F28377D MCU: High performance C2000 MCU located on the control card
• 180-pin HSEC8 Edge Card Interface: Allows compatibility with all of C2000’s 180-pin control cardapplication kits and control card. Compatibility with 100-pin control cards can be accomplished usingthe TMDSADAP180TO100 adapter card (sold separately)
• Built-In Isolated JTAG Emulation: An XDS100v2 emulator that provides a convenient interface toCode Composer Studio™ without additional hardware. Flipping a switch allows an external JTAGemulator to be used
• Connectivity: Allows the user to experiment with USB, microSD card, and isolated UART/SCI with theF2837x MCU
• Key Signal Breakout: Most GPIO, ADC, and other key signals routed to hard gold connector fingers
• Robust Power Supply Filtering: Single 5-V input supply powers an on-card 3.3-V LDO. All MCU
inputs are then decoupled using LC filters near the device
• Anti-Aliasing Filters: Noise filters (small RC filters) can be easily added on several ADC input pins

图7.控制卡TMDXCNCD28377D外形图

图8.控制卡TMDXCNCD28377D电路图(1)

图9.控制卡TMDXCNCD28377D电路图(2)

图10.控制卡TMDXCNCD28377D电路图(3)

图11.控制卡TMDXCNCD28377D电路图(4)

图12.控制卡TMDXCNCD28377D电路图(5)

图13.FMB电路图(1)

图14.FMB电路图(2)

图15.FMB电路图(3)

图16.FMB电路图(4)

图17.FMB电路图(5)

图18.FMB电路图(6)

图19.FMB电路图(7)
ICVM材料清单(BOM):


FMB材料清单(BOM):



图20.TIDA-00080-B-FMB PCB设计图(1)

图21.TIDA-00080-B-FMB PCB设计图(2)

图22.TIDA-00080-B-FMB PCB设计图(3)

图23.TIDA-00080-B-FMB PCB设计图(4)

图24.TIDA-00080-B-FMB PCB设计图(5)

图25.TIDA-00080-B-FMB PCB设计图(6)

图26.TIDA-00080-B-FMB PCB设计图(7)

图27.TIDA-00080-B-FMB PCB设计图(8)

图28.TIDA-00080-ICVM PCB设计图(1)

图29.TIDA-00080-ICVM PCB设计图(2)

图30.TIDA-00080-ICVM PCB设计图(3)

图31.TIDA-00080-ICVM PCB设计图(4)

图32.TIDA-00080-ICVM PCB设计图(5)

图33.TIDA-00080-ICVM PCB设计图(6)

图34.TIDA-00080-ICVM PCB设计图(7)

图35.TIDA-00080-ICVM PCB设计图(8)

图36.TIDA-00080-ICVM PCB设计图(9)
详情请见:
http://www.ti.com/lit/ds/symlink/amc1304m05.pdf
http://www.ti.com/lit/ug/tidu429a/tidu429a.pdf
amc1304m05.pdf
tidu429a.pdf

 

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