Capacitive Fault Detection in Moving-Object Power Supply Circuits
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Solution Overview
Problem
Existing power supply systems lack effective ground fault and short circuit detection mechanisms, which are crucial for ensuring reliable operation, particularly in electrified moving objects like aircraft.
Innovation Solution
A power supply system with integrated detection circuits that utilize capacitors to detect ground faults and short circuits by connecting power supply circuits to ground and positive/negative wires, allowing for precise voltage measurements to identify any short circuits or ground faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage detection is performed using existing power supply systems, then ground fault and short circuit detection can be achieved, but the detection precision and reliability are insufficient
Solution Approach 1:
The patent introduces a capacitor as an intermediary component in the detection circuit. The capacitor is connected in series with the voltage detection circuit, allowing the detection of voltage changes caused by ground faults or short circuits without directly loading the power supply circuit. This intermediary approach enables precise detection while maintaining system reliability.
Solution Approach 2:
The patent replaces traditional direct voltage measurement methods with a capacitive coupling-based detection method. Instead of directly measuring voltage across the power supply circuit, the system uses the capacitor to couple the detection circuit, transforming the measurement approach to achieve higher precision and reliability without direct electrical contact.
2Adaptability or versatility
If separate detection circuits are used for ground fault and short circuit detection, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal detection circuit that can detect both ground faults and short circuits using the same capacitor and voltage measurement mechanism. By configuring the capacitor in series with the voltage detection circuit, the system achieves multi-functional detection capability without requiring separate dedicated circuits for each type of fault, thereby reducing overall complexity.
Solution Approach 2:
The patent merges the ground fault detection and short circuit detection functions into a single integrated detection circuit. The capacitor serves both detection purposes simultaneously, combining what would traditionally require separate circuits into one unified system, thus reducing device complexity while maintaining comprehensive detection coverage.
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 system provides reliable detection of ground faults and short circuits, ensuring continuous and safe power supply to load devices by preventing power loss and damage, enhancing the reliability of electrified moving objects.
Implementation Method 1
a capacitor (86)
Data Source
AI summary
A power supply system includes: a power supply circuit for supplying, to a load device, DC power output from a power source device; and a detection circuit capable of selectively performing ground fault detection for connecting the power supply circuit to a ground via a capacitor to detect whether or not the power supply circuit is short-circuited to the ground based on the voltage of the capacitor, and short circuit detection for connecting, via the capacitor, a positive wire provided in the power supply circuit to a negative wire provided in the power supply circuit to detect whether or not the positive wire and the negative wire are short-circuited based on the voltage of the capacitor.