Dynamic Pulse Leakage Detection for DC Power Supplies
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Solution Overview
Problem
Existing electric leakage detection apparatuses for DC power supplies in electric vehicles are inefficient due to prolonged pulse intervals and potential misdiagnosis caused by extended discharge times, which hinder quick detection of electric leakage and abnormality determination.
Innovation Solution
An electric leakage detection apparatus that includes a coupling capacitor, a pulse generator, a voltage detector, an electric leakage determination unit, and a discharge determination unit, which generates a new pulse when the voltage falls below a second threshold, allowing for shortened pulse intervals and forced discharge of the capacitor to rapidly detect electric leakage, and an abnormality determination unit to identify non-discharge states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pulse cycle is kept constant and the discharge time is extended to ensure complete capacitor discharge, then the voltage measurement accuracy is improved, but the detection time is lengthened and productivity is reduced
Solution Approach 1:
The patent applies dynamics by making the pulse cycle variable rather than constant. The control unit dynamically adjusts the pulse cycle based on the discharge state of the coupling capacitor, shortening the cycle when voltage is low and lengthening it when voltage is high, thereby optimizing both measurement accuracy and detection speed
Solution Approach 2:
The patent changes the parameter of pulse cycle duration based on the capacitor's discharge state. By monitoring the voltage and adjusting the pulse cycle parameter dynamically, the system achieves accurate measurements without requiring excessively long discharge times, thus improving detection efficiency
2Productivity
If the pulse interval is shortened to improve detection speed, then productivity is improved, but the capacitor may not fully discharge causing measurement errors and reliability deteriorates
Solution Approach 1:
The patent implements feedback by having the control unit monitor the voltage at the coupling capacitor and use this information to adjust the pulse cycle. The voltage detection result feeds back to the control unit, which then determines the appropriate pulse timing to ensure accurate measurements while maintaining fast detection
Solution Approach 2:
The system performs preliminary voltage detection before each pulse to determine the appropriate pulse cycle. This preliminary action allows the system to prepare the optimal pulse timing in advance, ensuring both speed and accuracy without requiring the capacitor to fully discharge
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 rapid detection of electric leakage and abnormality by shortening pulse intervals and ensuring accurate determination before capacitor saturation, thereby improving detection efficiency and reliability.
Implementation Method 1
a coupling capacitor whose one end is connected to a DC power supply; a pulse generator that supplies a pulse to the other end of the coupling capacitor
Data Source
AI summary
An electric leakage detection apparatus may quickly detect an electric leakage. An electric leakage detection apparatus includes a pulse generator that supplies a pulse to a coupling capacitor, a voltage detector that detects a voltage at the coupling capacitor, an electric leakage determination unit that compares the voltage detected by the voltage detector to a first threshold and determines presence or absence of the electric leakage of a DC power supply based on a comparison result. The electric leakage detection apparatus also includes a discharge determination unit that compares the voltage detected by the voltage detector to a second threshold lower than the first threshold and determines whether the detection voltage becomes lower than the second threshold by a discharge of the coupling capacitor. The pulse generator generates a new pulse when the discharge determination unit determines that the detection voltage becomes lower than the second threshold.