Voltage Divider Self-Diagnosis via Test Pattern Injection
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Solution Overview
Problem
Conventional high DC voltage detection methods using voltage dividers are unreliable due to resistance changes, making accurate voltage measurement difficult and potentially causing motor control instability and module failures, with existing diagnostic techniques unable to determine failed components and perform appropriate backup operations.
Innovation Solution
A voltage detection apparatus with a test pattern insertion circuit that includes a second resistor and a switching device, connected to the equipotential connection point of the first divided voltage, allowing for the detection of the first resistor's state based on the second divided voltage when the switching device is conductive, enabling diagnosis of the voltage divider's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage dividers are connected in series in a multistage manner to convert voltage, then voltage can be measured in the low-voltage control circuit, but resistance changes due to deterioration cause divided voltage to change and accurate measurement cannot be performed
Solution Approach 1:
The patent applies preliminary action by performing self-diagnosis of the voltage divider circuit before failure occurs. The test pattern insertion circuit introduces a known test signal to measure the actual division ratio, allowing early detection of resistor deterioration and enabling preventive maintenance before accurate voltage measurement is compromised.
Solution Approach 2:
The patent implements feedback by continuously monitoring the division ratio through the test pattern insertion circuit and comparing it against expected values. This feedback mechanism allows the system to detect resistance changes in real-time and alert users to potential failures, maintaining measurement accuracy despite resistor deterioration.
2Measurement precision
If conventional high DC voltage detection method is used, then voltage can be measured, but it is difficult to determine which part of the high DC voltage detection circuit fails and backup operation cannot be performed
Solution Approach 1:
The patent applies segmentation by dividing the voltage detection circuit into distinct measurable sections. The test pattern insertion circuit creates separate test paths that allow independent measurement of each resistor's contribution to the overall division ratio, making it possible to identify which specific component has failed.
Solution Approach 2:
The patent uses an intermediary approach by introducing a test pattern insertion circuit as a mediator between the voltage divider and the measurement system. This intermediary circuit allows injection of known test signals that traverse through specific components, enabling isolation and identification of failed parts without disrupting normal operation.
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
The apparatus effectively diagnoses the state of the voltage divider, improving measurement reliability and enabling appropriate backup operations by determining resistance value abnormalities in the first resistor.
Implementation Method 1
a first resistor for dividing voltage of a detection unit into a first divided voltage value
Implementation Method 2
a second resistor for dividing the first divided voltage value into a second divided voltage value
Data Source
AI summary
An object of the present invention is to diagnose a state of a voltage divider while performing a normal measurement to improve reliability. A voltage detection apparatus according to the present invention includes: a first resistor for dividing voltage of a detection unit into a first divided voltage value; and a test pattern insertion circuit unit including a second resistor for dividing the first divided voltage value into a second divided voltage value and a switching device, wherein the test pattern insertion circuit unit is connected to an equipotential connection point to the first divided voltage value, and wherein a state of the first resistor is detected based on the second divided voltage value when the switching device is conductive.