SLUAB09 October   2025 AMC0386-Q1 , TPS61170 , TPS61170-Q1 , TPSI2140-Q1

 

  1.   1
  2.   Abstract
  3. 1Introduction
    1. 1.1 Background
    2. 1.2 System Requirements
    3. 1.3 Typical Challenges
      1. 1.3.1 Influence of Y-Capacitors
      2. 1.3.2 High Potential Testing
      3. 1.3.3 Wide AC Voltage Range
  4. 2Insulation Monitoring Architectures
    1. 2.1 Basic Architecture
    2. 2.2 Dual-Switch Architecture
    3. 2.3 Active Single-Switch Architecture
    4. 2.4 Architecture Comparison
  5. 3Key Components
    1. 3.1 Solid-State Relay
    2. 3.2 Voltage Sensor
    3. 3.3 DC Power Supply
  6. 4Summary
  7. 5Reference
  8.   Trademarks

2.1 Basic Architecture

Figure 2-1 shows the block diagram and the equivalent circuit of the basic architecture. RisoL is the insulation resistance between Line and PE. RisoN is the insulation resistance between Neutral and PE. RstL and RinL are the resistor dividers between Line and PE. RstN and RinN are the resistor dividers between Neutral and PE.

TPSI2140 AMC0381 TPS61170 Block Diagram and the Equivalent Circuit of the Basic Architecture Figure 2-1 Block Diagram and the Equivalent Circuit of the Basic Architecture

The basic working principle of this architecture is that two-series resistors measure two voltages, and then the operational amplifier converts the differential voltage to a single-ended voltage.