Insulation Resistance Calculation Using Intermediary Reference Voltage
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Solution Overview
Problem
Existing methods for calculating insulation resistance between a battery's positive and negative terminals and a chassis are limited, as they require a chassis as a reference voltage, making it impossible to calculate insulation resistance in devices not connected to a chassis, such as battery disconnecting units.
Innovation Solution
A system and method using first to third resistor units connected between the battery's positive and negative terminals and the chassis, with a control unit calculating insulation resistance based on voltages measured across these resistors, utilizing the negative terminal's voltage as a reference, allowing for insulation resistance calculation between the positive terminal and chassis, and the negative terminal and chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a chassis is used as a reference voltage for measuring insulation resistance, then the measurement can be performed using conventional methods, but the method cannot be applied to devices not connected to a chassis such as battery disconnecting units
Solution Approach 1:
The patent introduces an intermediary reference voltage generated from the battery's negative terminal through a voltage divider circuit (resistors R1 and R2). This intermediary reference voltage serves as a substitute for the chassis reference, enabling insulation resistance measurement in devices not connected to the chassis while maintaining measurement accuracy through the established voltage division relationship.
2Adaptability or versatility
If insulation resistance measurement is performed using conventional chassis-based methods, then the measurement system is simple, but it is impossible to calculate insulation resistance in devices like battery disconnecting units that are not connected to a chassis
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the voltage across the second resistor (R2) and uses this feedback information to calculate insulation resistance. By measuring the voltage drop across R2 and comparing it with the known voltage division ratio, the system accurately determines insulation resistance values even in devices not connected to the chassis, maintaining measurement precision through closed-loop voltage monitoring.
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
Enables the calculation of insulation resistance between a battery and a chassis for both connected and disconnected devices, improving safety and reliability by maintaining insulation resistance at predetermined levels, even in products not directly connected to a chassis.
Implementation Method 1
a first resistor unit (110) connecting a positive terminal (10P) of a battery (10) and a chassis (20), a second resistor unit (120) connecting a negative terminal (10N) of the battery (10) and the chassis (20)
Data Source
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AI summary
The present invention relates to a system and a method for calculating insulation resistance, and more particularly, to a system and a method for calculating insulation resistance, which calculate insulation resistance between a positive terminal and a negative terminal of a battery and a chassis based on voltages of the battery applied to a resistor that connects the positive terminal of the battery and the chassis and a resistor that connects the negative terminal of the battery and the chassis.