TIDUDJ6B August   2022  – February 2023 OPA388-Q1

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  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

3.2.2.4 Isolation Error at ¼ HV Battery Voltage

An error condition is created at ¼ HV battery voltage to chassis ground. To understand the behavior of error conditions, measurements were performed at different battery voltages.

GUID-819D1C44-4CAA-4897-B07B-082713FE238F-low.gif Figure 3-18 Isolation Error at 100 V for 400-V Battery
 Battery voltage = 400 V, isolation error = 100 V
CH1: ISO_POS
CH2: ISO_NEG
CH3: RELAY_NEG
CH4: RELAY_POS
GUID-886269A9-D24A-4C7A-9D99-D79594C07BE8-low.gif Figure 3-19 Isolation Error at 112.5 V for 450-V Battery
 Battery voltage = 450 V,
isolation error = 112.5 V
CH1: ISO_POS
CH2: ISO_NEG
CH3: RELAY_NEG
CH4: RELAY_POS
Table 3-4 Measurements at ¼ HV Battery
HV BATTERY VOLTAGE
(SUPPLIED AND MEASURED)		 MEASURED REFERENCE VOLTAGE MEASURED PEAK ISO_POS VOLTAGE MEASURED PEAK ISO_NEG VOLTAGE
100.006 2.505 2.5 2.921
150.008 2.504 2.448 3.076
200.003 2.504 2.398 3.232
250.004 2.504 2.346 3.387
300.004 2.504 2.295 3.543
350.004 2.504 2.237 3.699
400.006 2.504 2.191 3.854
450.007 2.504 2.139 4.01

#T5081059-37 shows the deviations for POS ADC and NEG ADC voltages from normal conditions. POS and NEG are greater than expected and constant when relays are closed. This behavior resonates to an isolation error from the high-voltage section to chassis ground.

GUID-015B94CB-100E-4392-BF0D-4146DB271748-low.gif Figure 3-20 Behavior for Isolation Error at ¼ HV Battery