Insulation Sampling Circuit With Switchable Ground Isolation
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Solution Overview
Problem
Existing insulation test circuits have a limited voltage withstand capacity, which is insufficient for higher voltage tests, posing a risk to electrical safety.
Innovation Solution
An insulation sampling circuit with a voltage withstand module on the ground wire, allowing disconnection and reconnection, and switch modules for independent control of sampling circuits, enhancing voltage withstand capacity and enabling accurate fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground wire is kept connected for insulation testing, then insulation measurement can be performed, but the voltage withstand capacity is limited and cannot meet higher voltage test requirements
Solution Approach 1:
The ground wire's connection state is made dynamic through a controllable switch, allowing it to be connected during insulation testing and disconnected during voltage withstand testing. This dynamic configuration enables the system to adapt to different test requirements, resolving the contradiction between maintaining insulation test capability and achieving high voltage withstand capacity.
Solution Approach 2:
The testing process is segmented into distinct phases with different ground wire connection states. The controllable switch divides the operational modes, allowing independent optimization for each test type - insulation testing with ground connected and voltage withstand testing with ground disconnected.
2Adaptability or versatility
If a single sampling circuit is used for insulation testing, then the circuit structure is simple, but it cannot independently control sampling for different test requirements
Solution Approach 1:
The sampling circuit is segmented into multiple independent sampling circuits, each with its own controllable switch. This segmentation allows each sampling circuit to be independently controlled and configured for specific test requirements, enhancing adaptability while maintaining manageable complexity through modular design.
Solution Approach 2:
Each sampling circuit is equipped with a controllable switch that enables dynamic configuration. The switches can be controlled to connect or disconnect sampling circuits based on test requirements, providing flexibility in test setup without permanently increasing circuit complexity.
Data Source
AI summary
The present application discloses an insulation sampling circuit. The insulation sampling circuit includes: a first sampling circuit composed of a first sampling module, a first resistor, and a first switch module; a second sampling circuit composed of a second sampling module, a second resistor, and a second switch module; and a voltage withstand module. The first resistor is connected in parallel to the first sampling module; the first switch module is configured to control the first sampling module and/or the first resistor to be connected between a positive bus and a ground wire; the second resistor is connected in parallel to the second sampling module; the second switch module is configured to control the second sampling module and/or the second resistor to be connected between a negative bus and the ground wire; and the voltage withstand module is disposed on the ground wire to disconnect the ground wire.