Grounding Detector Pulse Frequency Control
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Solution Overview
Problem
Conventional grounding detectors for high-voltage power supplies in electric vehicles require complex and costly circuit configurations, including low-pass filters, high-pass filters, and offset circuits, which increase the size and expense of the device.
Innovation Solution
A grounding detector that uses a coupling capacitor and a pulse generator to adjust the frequency of a pulse signal based on detected voltage levels, eliminating the need for band pass filters and amplification circuits, thereby stabilizing the detection process with an inexpensive circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a band pass filter and offset circuit are used to remove noise and offset voltage, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary circuit components (band pass filter and offset circuit) from the grounding detector. By removing these components, the circuit complexity and manufacturing cost are reduced while maintaining the ability to detect grounding through a simplified voltage measurement approach that directly measures the voltage at the coupling capacitor without requiring complex signal conditioning circuits.
Solution Approach 2:
The patent replaces expensive, complex circuit components with simpler, more cost-effective alternatives. Instead of using band pass filters and offset circuits, the invention uses a straightforward voltage detection method that requires minimal circuitry, thereby reducing manufacturing costs and device complexity while achieving the same grounding detection function.
2Reliability
If a band pass filter and offset circuit are used to stabilize voltage detection, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the band pass filter and offset circuit from the grounding detector design. This extraction of unnecessary components simplifies the manufacturing process and reduces costs while maintaining reliable grounding detection through direct voltage measurement at the coupling capacitor, which inherently provides stable detection without requiring complex signal conditioning.
Solution Approach 2:
The invention substitutes expensive, complex circuitry with simple, cost-effective voltage detection circuitry. By eliminating the need for band pass filters and offset circuits, the manufacturing cost is significantly reduced while the grounding detection reliability is maintained through the simplified but effective direct voltage measurement approach.
3Productivity
If the pulse generator operates at high frequency, then productivity is improved, but the voltage may exceed the detectable range causing measurement errors
Solution Approach 1:
The patent implements dynamic frequency control of the pulse generator based on the detected voltage level. When the voltage exceeds the detectable range, the pulse generator automatically adjusts its frequency to bring the voltage back within the measurable range. This dynamic adjustment ensures both high detection speed and accurate voltage measurement by adapting the operating frequency to the current voltage conditions.
Solution Approach 2:
The patent employs a feedback mechanism where the voltage detector continuously monitors the voltage at the coupling capacitor and provides feedback to the pulse generator. Based on this feedback, the pulse generator adjusts its operating frequency to maintain the voltage within the detectable range, thereby ensuring both high productivity and measurement precision through closed-loop control.
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 allows for stable and accurate grounding detection without the need for high-pass filters and offset circuits, reducing errors and maintaining voltage within a detectable range, thus achieving cost-effective and reliable grounding detection.
Implementation Method 1
a coupling capacitor that is connected at one end to an output terminal of a power supply
Data Source
AI summary
A grounding detector includes a coupling capacitor connected at one end to an output terminal of a power supply and at another end to a measuring point, a voltage detector to detect a voltage amplitude generated at the measuring point, a pulse generator to generate a pulse signal at a prescribed frequency, to apply the pulse signal to the measuring point, and to generate a modified pulse signal having a modified frequency when the detected voltage amplitude is outside of a prescribed voltage range, the modified frequency being set below the prescribed frequency that existed when the voltage amplitude detected by the voltage detector is within the prescribed voltage range, and a grounding occurrence detection unit that detects the occurrence of grounding of the circuit based on the voltage amplitude detected at the measuring point during the application of the pulse signal to the measuring point.