DC Voltage Detection Device Using Differential Signal Processing
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Solution Overview
Problem
Existing voltage detection devices in vehicles face challenges in accurately detecting DC output voltage while minimizing power consumption and reducing the complexity of circuitry, which can lead to increased noise and quantization errors, as well as a high likelihood of failure.
Innovation Solution
A voltage detection device that includes a voltage conversion means to output first and second voltages that increase and decrease with the DC voltage, respectively, and a voltage calculation means to calculate the DC voltage based on their difference, along with a failure judgment means to detect any input failures, ensuring reliable detection without excessive power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dynamic range of the current that flows through the cable is made large to enhance detection accuracy, then measurement precision is improved, but power consumption increases due to cable losses
Solution Approach 1:
The patent replaces the mechanical/electrical current flow method with a voltage-based detection method. Instead of flowing current through a cable and measuring voltage drop (which causes power loss), the invention uses a voltage sensor to directly measure voltage at the battery terminal, eliminating the need for high current flow and associated cable losses while maintaining detection accuracy.
Solution Approach 2:
The patent introduces a voltage sensor as an intermediary device between the battery and the detection system. This intermediary allows accurate voltage measurement without requiring high current to flow through the cable, thus resolving the contradiction between measurement precision and power consumption by decoupling the measurement process from the power-consuming current flow.
2Measurement precision
If a voltage sensor with voltage conversion circuit is used to detect DC voltage, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential voltage sensing function from complex voltage conversion circuits. By using a simple voltage sensor that directly measures voltage without requiring complex conversion stages, the invention achieves adequate measurement precision while significantly reducing circuit complexity and the number of components required.
Solution Approach 2:
The patent employs a simple, low-cost voltage sensor instead of expensive, complex voltage conversion circuits. This approach prioritizes reliability and simplicity over maximum measurement precision, using a straightforward detection method that is easier to manufacture and less prone to failure, effectively treating the detection system as a simple, reliable component rather than a complex measurement instrument.
Data Source
AI summary
A voltage detection device that is connected to a DC circuit to which a DC voltage is applied and that detects the DC voltage applied to the DC circuit comprises a voltage conversion means for outputting a first voltage that increases as the DC voltage increases and a second voltage that decreases as the DC voltage increases, a voltage calculation means for inputting the first voltage and the second voltage outputted from the voltage conversion means and calculating the DC voltage based upon a difference between the inputted first voltage and the inputted second voltage, and a first failure judgment means for judging that failure has occurred if at least one of the first voltage and the second voltage is not inputted to the voltage calculation means.