Electrical Leakage Determination System Using Oscillator Voltage Segmentation
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Solution Overview
Problem
Existing electrical leakage determination systems face challenges in accurately detecting electrical leakage in vehicles due to increased ground capacitance, which leads to longer detection periods and reduced accuracy.
Innovation Solution
The system employs a coupling capacitor and resistor with an oscillator outputting a higher AC voltage during a preparation period before detection, allowing the ground capacitance to charge quickly, thereby reducing detection errors and shortening the determination period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection timing is delayed to allow ground capacitance to charge fully, then detection accuracy is improved, but determination period is extended
Solution Approach 1:
The patent applies preliminary action by outputting a first AC voltage during a preparation period before the actual detection timing. This preliminary voltage output allows the ground capacitance to charge up in advance, so that when detection occurs, the capacitance is already in a stable state, eliminating the need to delay detection for charging purposes and thus resolving the contradiction between accuracy and time.
Solution Approach 2:
The patent segments the voltage output into two distinct phases: a preparation period with first AC voltage (higher absolute value) and a detection period with second AC voltage (lower absolute value). This segmentation allows the system to perform charging action separately from detection action, enabling both fast charging and accurate detection without time compromise.
2Device complexity
If a constant AC voltage is output, then device complexity is reduced, but ground capacitance charging is slow extending determination period
Solution Approach 1:
The patent applies dynamics by making the AC voltage output variable rather than constant. The oscillator dynamically changes the absolute value of the output voltage based on the operational phase: higher voltage during preparation period for fast charging, lower voltage during detection period for accurate measurement. This dynamic adjustment resolves the contradiction between simple control and fast charging.
3Speed
If higher AC voltage is output continuously, then ground capacitance charges faster, but detection accuracy decreases due to charging influence
Solution Approach 1:
The patent applies periodic action by using different AC voltage levels for different time periods: a first AC voltage with higher absolute value during the preparation period for rapid charging, and a second AC voltage with lower absolute value during the detection period for accurate measurement. This periodic variation in voltage magnitude allows the system to achieve both fast charging and accurate detection without interference from charging effects.
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 enhances detection accuracy and reduces the detection period by ensuring the ground capacitance is fully charged before the detection timing, minimizing errors caused by capacitance influences.
Implementation Method 1
a coupling capacitor with its one end connected to the power supply path, a resistor connected to the other end of the coupling capacitor, and an oscillator connected to the resistor to output an AC voltage to the resistor
Implementation Method 2
When a voltage is output on a condition that a ground capacitance is relatively larger, a voltage detected at the connection point (M2) gradually changes as time elapses due to an influence of charging of the ground capacitance
Data Source
AI summary
An electrical leakage determination system determines if an electrical leakage occurs between each of power supply paths and a grounding section. The electrical leakage determination system includes a coupling capacitor with one end connected to an anode-side power supply path, a resistor connected to the other end of the coupling capacitor, and an oscillator connected to the resistor to output an AC voltage to the resistor. A determiner detects a voltage at a connection point located between the coupling capacitor and the resistor when the oscillator outputs an AC voltage to the resistor. The determiner determines if the electrical leakage occurs based on the detected voltage. The oscillator increases an absolute value of an AC voltage output during a preparation period provided prior to a detection timing when a voltage is detected at a connection point greater than an absolute value of an AC voltage output at the detection timing.