Electric Leakage Sensing Apparatus With Booster Circuit
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Solution Overview
Problem
Existing electric leakage sensing apparatuses face limitations in sensing accuracy due to the dependence on voltage levels applied to the coupling capacitor, where high voltages exceed CPU readable ranges, preventing accurate determination of electric leakage.
Innovation Solution
Incorporating a booster circuit to increase the voltage applied to the coupling capacitor, accompanied by an offset voltage generating circuit and calculation circuit to subtract the offset voltage from the detected voltage, ensuring the detection voltage remains within the CPU's readable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the voltage applied to the coupling capacitor is increased to enhance sensing accuracy, then the sensing accuracy is improved, but the voltage exceeds the CPU readable range
Solution Approach 1:
The patent introduces a voltage detector as an intermediary component between the high-voltage coupling capacitor and the CPU. The voltage detector converts the high voltage from the coupling capacitor into a low voltage that the CPU can read, while still enabling accurate sensing of electric leakage. This mediator resolves the contradiction by allowing high voltage application for improved sensing accuracy while keeping the CPU interface within readable voltage ranges.
2Measurement precision
If a booster circuit is added to increase voltage for better sensing, then sensing accuracy improves, but device complexity increases
Solution Approach 1:
The voltage detector circuit serves multiple functions simultaneously: it acts as a voltage scaling device to reduce high voltage to readable levels, a protection barrier between the high-voltage capacitor and CPU, and part of the sensing mechanism itself. By making the voltage detector multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby limiting the increase in overall device complexity while still achieving improved sensing accuracy through voltage boosting.
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 accurate determination of electric leakage even with increased voltage levels, enhancing sensing accuracy while keeping the detection voltage within the CPU's readable range.
Implementation Method 1
a coupling capacitor in which 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 sensing apparatus includes a coupling capacitor having one end connected to a DC power supply, a pulse generator that supplies a pulse to the other end of the coupling capacitor, a voltage detector that detects a voltage at the coupling capacitor charged by the pulse, an electric leakage determination part that compares the voltage detected by the voltage detector to a threshold value, and makes a determination of existence or non-existence of an electric leakage of the DC power supply based on a comparison result, and a booster circuit that applies a boosted pulse voltage to the coupling capacitor. The pulse generator converts an output voltage of the booster circuit into the pulse voltage. The voltage detector includes an offset voltage generating circuit that generates an offset voltage.