推荐星级:
- 1
- 2
- 3
- 4
- 5
罗氏线圈电路
资料介绍
罗氏线圈电路,Ti 技术资料,通俗易懂。
部分文件列表
文件名 | 大小 |
TI-rogowski.pdf | 2M |
部分页面预览
(完整内容请下载后查看)TI Designs
Active Integrator for Rogowski Coil Reference Design
With Improved Accuracy for Relays and Breakers
Design Overview
Design Features
The TIDA-00777 is an op amp-based active integrator
design that covers a wide input of current range
measurement using a Rogowski coil with excellent
accuracy, linearity, stability, and repeatability. The
integrator uses a precision amplifier with very low
offset and temperature drift. Two configurations of the
integrator are shown: one for precision measurement
with less than 3° phase error, and the other for fast
response time (< 15 ms). While the output signal is
bipolar, an optional level shifting stage can be used
when unipolar output is required.
•
Current Measurement Using Rogowski (di/dt) Coil-
Based Current Sensor:
–
0.5 to 200-A for Precision Measurement Within
±0.5% Accuracy
–
0.5 to 200 A for Fast Settling Within ±1%
Accuracy of Final Measured Value
•
Integration Achieved in Hardware With
–
RC, Low-Noise Density Op Amp Based
Integrator Design
–
Parallel Paths With Low-Phase Shift Error and
Fast Output Response Time
Design Resources
•
Phase Error < 3° for 50 and 60 Hz for
Precision Measurement
Design Folder
Product Folder
Product Folder
Product Folder
Product Folder
Product Folder
Product Folder
•
Phase Error < 15° for 50 and 60 Hz for Fast
Settling
•
Op Amp Gains Designed for Integrating Rogowski
Coil (Pulse, PA3209NL) Specification: 463 µV/A at
50 Hz;
556 µV/A at 60 Hz
•
•
Operates With a Single DC Input
AFE Output Type:
–
–
Bipolar: VOUT = ±2.5 V
Unipolar: VOUT = 0 to 5 V, VCM = 2.5 V
•
Interfaced to MSP430F6779 Metering SoC for
Accuracy Measurement and ADS131E08
Featured Applications
•
•
Protection Relays and IEDs
Circuit Breakers
2.5
V
LDO
5-V DC
supply
input
V+
(LP2951ACSD/NOPB)
ÞVE_UNREG
5
V
Charge pump
(TPS60403DBV)
Þ2.5
V
LDO
(TPS72325DBVT)
VÞ
GND
2.5
V
Þ2.5
V
V+
VÞ
Precision measurement
Level shifter (OPA188)
Amplifier (OPA2188-1A)
Active integrator (OPA2188-1B)
Precision
measurement
output
RF
RF
RF
R1
R1
Þ
C
Þ
RI
Rogowski
coil output
R2
R3
+V
Þ
RI
+V
+
+
+V
+
2.5
V
Þ2.5 V
V+
VÞ
Fast settling
Level shifter (OPA188)
Active integrator (OPA2188-1B)
Amplifier (OPA2188-1A)
RF
RF
C
Fast settling
output
R1
RF
R1
Þ
Þ
RI
R2
R3
+V
Þ
RI
+
+V
+
+V
+
5
V
GND
Jumper
selection
Buffer (OPA188)
GND
Voltage reference
(LM4040AIM3-2.5/NOPB)
REF_2.5
V
Þ
+V
+
TIDA-00777
© 2016, Texas Instruments Incorporated
Copyright
All trademarks are the property of their respective owners.
1
September 2016
Active Integrator for Rogowski Coil Reference Design With Improved
Accuracy for Relays and Breakers
Copyright © 2016, Texas Instruments Incorporated
全部评论(1)
2020-10-22 08:34:08bfs
非常感谢