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

2.2 Dual-Switch Architecture

Figure 2-2 shows the block diagram and the equivalent circuit of the dual-switch architecture. The key difference between dual-switch architecture and basic architecture is the use of two switches between Line and Neutral.

TPSI2140 AMC0381 TPS61170 Block Diagram and the Equivalent Circuit of the Dual-Switch Architecture Figure 2-2 Block Diagram and the Equivalent Circuit of the Dual-Switch Architecture

The basic working principle is to close these two switches alternately, forming two different equivalent circuits. The two equivalent circuits correspond to two different equations, thus solving for the values of the two insulation resistances, RisoL and RisoN. TIDA-010232 is a reference design based on this architecture.