Insulation Resistance Detection With Adaptive Voltage-Node Switching
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Solution Overview
Problem
Existing insulation resistance detection devices suffer from decreased accuracy due to voltage drops at measurement nodes, leading to increased measurement errors.
Innovation Solution
The device includes a voltage measurer and a controller that switch the state of a switch connected to another node to maintain a higher voltage measurement when the initial node voltage drops below a threshold, using multiple voltage dividing resistors and a microcontroller unit to stabilize the measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is measured at a single node in the insulation detection circuit, then the device structure remains simple, but measurement accuracy decreases when the node voltage drops below a threshold
Solution Approach 1:
The patent implements dynamic switching between multiple voltage measurement nodes based on real-time voltage levels. The controller monitors the voltage at the first node and automatically switches to a second node when the voltage drops below a threshold, making the measurement system adaptive to changing operating conditions rather than static
Solution Approach 2:
The patent changes the measurement parameter (voltage level at different nodes) based on system state. By selecting different nodes in the voltage dividing resistor network, the system adjusts the measurement voltage parameter to remain within an optimal range for accurate insulation resistance calculation
2Measurement precision
If multiple voltage dividing resistors and switching mechanisms are added to maintain measurement voltage, then measurement accuracy is maintained, but device complexity increases
Solution Approach 1:
The voltage dividing resistor network serves multiple functions: it provides voltage division for measurement, creates multiple measurement nodes with different voltage levels, and enables automatic switching based on voltage conditions. This multi-functionality reduces the need for separate dedicated components for each function
Solution Approach 2:
The controller continuously monitors the voltage at the measurement node and uses this feedback to determine when to switch between nodes. This closed-loop feedback mechanism ensures the measurement voltage remains within the optimal range while automatically adapting to battery voltage variations without manual intervention
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach suppresses the decrease in detection accuracy by ensuring a higher voltage is measured, reducing measurement errors and maintaining precise insulation resistance detection.
Implementation Method 1
a plurality of voltage dividing resistors connected between a positive terminal and a negative terminal of a battery
Data Source
AI summary
An insulation resistance detection device includes: a voltage measurer that measures a voltage at a first node among a plurality of nodes between a plurality of voltage dividing resistors included in an insulation detection circuit for detecting insulation resistance in a path through which a current from a battery flows; a determiner that determines whether the voltage at the first node measured by the voltage measurer is lower than or equal to a predetermined voltage; and a switcher that switches a state of a switch connected to a second node among the plurality of nodes to cause the voltage measured by the voltage measurer to exceed the predetermined voltage, when the voltage at the first node measured by the voltage measurer is determined to be lower than or equal to the predetermined voltage.