JAJU528B August   2022  – January 2023 OPA388-Q1

 

  1.   概要
  2.   リソース
  3.   特長
  4.   アプリケーション
  5.   5
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagrams
    2. 2.2 Highlighted Products
      1. 2.2.1 TPSI2140-Q1
      2. 2.2.2 AMC1301-Q1
      3. 2.2.3 SN6501-Q1
    3. 2.3 System Design Theory
      1. 2.3.1 Isolation Leakage Current Theory
      2. 2.3.2 High-Voltage Measurement
  8. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Required Hardware
    2.     Hardware with Solid-State Relay
    3. 3.2 Testing and Results
      1. 3.2.1 Test Setup
      2. 3.2.2 Isolation Tests
        1. 3.2.2.1 Normal Conditions
        2. 3.2.2.2 Isolation Error at HV Positive
        3. 3.2.2.3 Isolation Error at HV Negative
        4. 3.2.2.4 Isolation Error at ¼ HV Battery Voltage
        5. 3.2.2.5 Isolation Error at ¾ HV Battery Voltage
        6. 3.2.2.6 Isolation Error at the Middle of an HV Battery Voltage
      3. 3.2.3 Solid-State Relay Isolation Tests
        1. 3.2.3.1 Normal Conditions
        2. 3.2.3.2 Isolation Error at HV Positive
        3. 3.2.3.3 Isolation Error at HV Negative
        4. 3.2.3.4 Isolation Error at ¼ HV Battery Voltage
        5. 3.2.3.5 Isolation Error at ¾ HV Battery Voltage
        6. 3.2.3.6 Isolation Error at the Middle of an HV Battery Voltage
      4. 3.2.4 High Voltage Measurements
      5. 3.2.5 Isolation Measurement Analysis
      6. 3.2.6 Error Analysis
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
      1. 4.3.1 Layout Prints
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
  12. 7Trademarks
  13. 8Revision History

3.2.4 High Voltage Measurements

High-voltage measurements are done by populating R1, R2, R3, R4, R5, and R6. The total resistance measured from HV POS to HV NEG is 801 kΩ; this result includes a shunt resistance of 488 Ω. The typical gain stage of the AMC1301-Q1 is 8.1517.

Equation 6. V A D C 1 = V R D I V 3 = - V P A C K ( R I S O N | | ( R D I V 3 + R D I V 4 ) ) ( R I S O N | | ( R D I V 3 + R D I V 4 ) ) + R I S O P ) × R D I V 3 R D I V 3 + R D I V 4
Equation 7. GUID-8CB7AA35-54AB-4F49-A753-1C873AC5400B-low.gif
Table 3-15 High-Voltage Measurements
HV BATTERY VOLTAGE
(SUPPLIED AND MEASURED)		 EXPECTED OUTPUT OF OPA320-Q1 MEASURED OUTPUT OF OPA320-Q1 ERROR (%)
99.98 0.9947 0.9885 0.624
149.99 1.4926 1.4856 0.473
200.003 1.9905 1.9825 0.403
250 2.4884 2.4795 0.361
300 2.9863 2.9762 0.340
350 3.4842 3.473 0.322
400 3.9820 3.97 0.303
450 4.4799 4.4668 0.293
500 4.9777 4.948 0.598
GUID-A1E138B0-2C1F-455C-AB36-181208398688-low.gif Figure 3-35 Behavior for Isolation Error at Middle of HV Battery

Multiple factors influence the calculations of high voltage. MELF resistors tolerance, bias currents, and offset voltages of analog components are important sources for the error. Consider the same for lifetime error calculations and design accordingly. MELF resistors must be chosen for low drift in resistance for temperature and aging factors.