TIDUF85A August   2024  – December 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
      1. 2.1.1 Subsystems
        1. 2.1.1.1 Arc Detection Channels
          1. 2.1.1.1.1 Isolated Current Measurement
          2. 2.1.1.1.2 Band-Pass Filter
          3. 2.1.1.1.3 Analog-to-Digital Conversion
          4. 2.1.1.1.4 Arc Detection Using Embedded AI Models
        2. 2.1.1.2 Arc Labeling Circuit
          1. 2.1.1.2.1 Isolated String Voltage Measurement
          2. 2.1.1.2.2 Isolated Arc Voltage Measurement With Isolated Comparator
          3. 2.1.1.2.3 Window Comparator for Advanced Labeling
    2. 2.2 Design Considerations
      1. 2.2.1 Current Sensor and Input Stage
      2. 2.2.2 Analog Band-Pass Filter
      3. 2.2.3 Arc-Labeling Circuit
        1. 2.2.3.1 String Voltage Sensing
        2. 2.2.3.2 Arc Gap Voltage Sensing
        3. 2.2.3.3 Differential to Single-Ended Conversion
        4. 2.2.3.4 Window Comparator for Arc Labeling
      4. 2.2.4 Auxiliary Power Supply
      5. 2.2.5 controlCard and Debug Interface
    3. 2.3 Highlighted Products
      1. 2.3.1 TIEVM-ARC-AFE
      2. 2.3.2 TMDSCNCD28P55X – TMDSCNCD28P55X controlCARD Evaluation Module
        1. 2.3.2.1 Hardware Features
      3. 2.3.3 OPA4323 – Quad, 5.5V, 20MHz, Zero-Cross Low-Noise (6nV/√Hz) RRIO Operational Amplifier
      4. 2.3.4 OPA323 – Single, 5.5V, 20MHz, Zero-Cross Low-Noise (6nV/√Hz) RRIO Operational Amplifier
      5. 2.3.5 AMC3330 – ±1V Input, Precision Voltage Sensing Reinforced Isolated Amplifier With Integrated DC/DC
      6. 2.3.6 AMC23C11 – Fast-Response, Reinforced, Isolated Comparator With Adjustable Threshold and Latch Function
  9. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Signal Chain Verification
      1. 3.1.1 Hardware Requirements
      2. 3.1.2 Test Setup
      3. 3.1.3 Test Results
    2. 3.2 Arc Testing
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author
  12. 6Revision History

3 Hardware, Testing Requirements, and Test Results

Table 3-1 describes the TIDA-010955 connection point and Table 3-2 lists the maximum input rating.

Table 3-1 Connector and Test Point Description
DESIGNATORDESCRIPTION

T1, T2, T3, T4

Current transformers for channels 1, 2, 3, and 4. Feed through PV cabling.

J1, J2, J3, J4

External current sensor input for channels 1, 2, 3, and 4

J7

Connector for auxiliary power (8V to 16V)

J5_1, J5_2

HSEC Connector for C2000 control card

J6

Debug header (Contains GPIOs, Voltage rails and a SPI)

J8A, J8B

Positive and negative input of string voltage for arc labeling circuit

J9A, J9B

Positive and negative input of arc gap voltage for labeling circuit

TP9, TP11, TP17, TP20

Positive output of CT of channels 1, 2, 3, and 4

TP10, TP12, TP19, TP21

Negative output of CT of channels 1, 2, 3, and 4

TP2, TP4, TP6, TP7

Input of band-pass filter after gain stage for channels 1, 2, 3, and 4

TP35, TP36, TP37, TP38

Output of low pass stage of bandpass filter for channels, 1, 2, 3, and 4

TP1, TP3, TP4, TP8

Output of band-pass filter for channels 1, 2, 3, and 4.

TP16

5V rail

TP18

3.3V rail

TP22

Output of window comparator for arc labeling

TP23, TP26

Positive and negative output of U11 for string voltage sensing (differential output)

TP24

Single-ended output of string voltage sensing

TP30, TP2Positive and negative output of U17 for arc gap voltage sensing (differential output)

TP31

Single-ended output of arc gap voltage sensing

TP13, TP14, TP15, TP39, TP40, TP25, TP29, TP33

GND
Table 3-2 Maximum Input Rating
CONNECTORMAXIMUM VOLTAGE (V)MAXIMUM CURRENT (A)

J9A, J9B

1500

Limited by resistor divider

J8A, J8B

1500

Limited by resistor divider

J7

16

0.6A (limited by eFuse)

J1, J2, J3, J4

3.3

Limited by burden resistor (R5, R10, R15, or R20)