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

2.3 Active Single-Switch Architecture

Figure 2-3 shows the typical block diagram and the equivalent circuit of the active single-switch architecture. In the figure, the IMD circuit is connected to neutral, while the circuit can also be placed in line or chassis. This architecture is characterized by having one switch and one external bias supply.

TPSI2140 AMC0381 TPS61170 Block Diagram and the Equivalent Circuit of the Active Single-Switch Architecture Figure 2-3 Block Diagram and the Equivalent Circuit of the Active Single-Switch Architecture

The basic working principle is based on the equivalent circuit when SN closes. The DC bias supply is the voltage source of the circuit. The effective insulation resistance of the system can be solved according to the resistor divider.