Dynamic Electronic Fuse Current Threshold Adaptation
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Solution Overview
Problem
Existing electronic fuses for monitoring power consumption in automotive systems face challenges in adapting to different operating voltages and brief voltage variations, leading to potential false tripping and inability to function reliably across various on-board power supply networks.
Innovation Solution
A method that senses the amplitude of current and voltage changes across an electrical consumer with a capacitive load, calculates allowed current amplitudes, and dynamically adjusts the electrical resistance of a controllable circuit element to prevent overload, using a combination of analog and digital circuits to accurately measure and respond to charging currents, thereby ensuring safe operation across different voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed threshold for allowed current amplitude is used, then the device can be manufactured with simple circuitry, but it causes false tripping when operating voltage varies across different automotive power networks
Solution Approach 1:
The patent implements dynamic adaptation of the allowed current amplitude threshold based on the detected operating voltage. The control device continuously monitors the operating voltage and adjusts the threshold accordingly, transitioning from a fixed static value to a dynamic value that scales with voltage. This resolves the contradiction by enabling the device to adapt to different automotive power networks (12V, 24V, 42V, 48V) while maintaining reliable operation without excessive complexity.
Solution Approach 2:
The patent changes the parameter of allowed current amplitude from a fixed constant to a variable parameter that depends on the operating voltage. By establishing a functional relationship between voltage and current threshold, the system automatically adjusts its monitoring characteristics to match the actual operating conditions, thereby achieving versatility across different voltage standards without requiring multiple hardware configurations.
2Reliability
If the electronic fuse responds immediately to current spikes, then it provides fast protection, but it causes false tripping due to brief voltage variations and capacitive load charging currents
Solution Approach 1:
The patent applies preliminary action by detecting and accounting for capacitive load charging currents before they trigger false protection responses. The control device identifies the characteristic waveform of capacitive charging currents and preemptively adjusts the allowed current amplitude or extends the evaluation time window, preventing false tripping before it occurs. This maintains reliable protection while avoiding unnecessary shutdowns.
Solution Approach 2:
The patent dynamically adjusts the protection response characteristics based on the detected current waveform and operating conditions. Instead of a fixed response time, the system adapts its evaluation window and threshold in real-time, extending the evaluation period during capacitive charging phases while maintaining fast response for genuine overcurrent faults. This dynamic behavior resolves the contradiction between fast protection and avoiding false tripping.
3Ease of operation
If the allowed current amplitude is reduced to account for voltage variations, then false tripping is reduced, but the device cannot handle legitimate high current demands
Solution Approach 1:
The patent changes the allowed current amplitude parameter from a conservative fixed low value to a dynamic value that scales with the detected operating voltage. When high operating voltage (e.g., 48V) is detected, the allowed current threshold is proportionally increased to accommodate legitimate high power demands. When low voltage (e.g., 12V) is detected, the threshold is reduced to prevent false tripping. This resolves the contradiction by enabling the device to handle both low-power and high-power applications appropriately.
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 safe operation of portable control devices in various automotive power networks by preventing false tripping and excessive power consumption, allowing a single device to function reliably across 12V to 48V voltages and accounting for brief voltage variations.
Implementation Method 1
the electrical resistance of the circuit element is increased if the amplitude of the consumer current is greater than the allowed instantaneous current amplitude
Data Source
AI summary
A method for monitoring the power consumption of an electrical consumer that has a capacitive load and the controllable circuit element and the consumer are connected in series. The amplitude of the current flowing through the consumer, the voltage dropping across the consumer, and the change over time of the voltage dropping across the consumer are sensed. An allowed operating current amplitude is calculated from the voltage dropping across the consumer and from a predefined power. A charging current amplitude of the capacitive load is calculated from the change over time of the voltage dropping across the consumer. An allowed instantaneous current amplitude is calculated. The allowed instantaneous current amplitude is compared with the amplitude of the current flowing through the consumer and the electrical resistance of the circuit element is increased if the amplitude of the current flowing through the consumer is greater than the allowed instantaneous current amplitude.