Multi-Mode Electronic Switching Circuit for Wire Overheat Protection
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Solution Overview
Problem
Existing electronic switching and protection circuits fail to effectively manage load currents, leading to potential wire damage or destruction due to overheating, as they lack a mechanism to monitor and respond to current-time characteristics in real-time.
Innovation Solution
An electronic circuit with a control circuit that operates in multiple modes, including a mode where it generates a protection signal based on the current-time characteristic of the load current and drives an electronic switch to prevent overload, using a combination of analog-to-digital conversion, filtering, and comparator circuits to monitor and manage the load current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the control circuit operates in the second operation mode with basic functions only, then the power consumption is reduced and the circuit is simplified, but the protection capability against wire damage is lost
Solution Approach 1:
The control circuit dynamically switches between two operation modes based on real-time current monitoring. In the first operation mode, the circuit performs basic current monitoring and switching functions with lower power consumption. When a threshold current is detected, the circuit transitions to the second operation mode where it activates comprehensive protection functions including wire temperature estimation and protection signal generation. This dynamic mode switching allows the circuit to adapt its functionality and power consumption according to the actual load conditions, resolving the contradiction between power savings and protection capability.
2Reliability
If the control circuit continuously monitors load current with full protection functions, then the wire damage protection is ensured, but the power consumption increases
Solution Approach 1:
The control circuit implements periodic current monitoring instead of continuous full-protection monitoring. The monitoring function is activated at specific intervals or under specific conditions (such as when threshold current is detected), rather than operating continuously. This periodic action allows the circuit to maintain adequate protection capability while significantly reducing the average power consumption compared to continuous full-protection operation.
3Power
If the electronic switch remains on during overload conditions, then the power transmission is maintained, but the wire overheating and damage occurs
Solution Approach 1:
The control circuit implements a feedback mechanism that continuously monitors the load current and compares it against pre-stored current-time characteristic data representing wire damage thresholds. When the monitored current exceeds the safe threshold (indicating overload conditions), the circuit generates a protection signal that automatically switches off the electronic switch. This feedback loop ensures that power transmission is maintained only under safe operating conditions, while automatically preventing wire overheating and damage when overload conditions are detected.
Data Source
AI summary
An embodiment electronic circuit includes an electronic switch comprising a load path, and a control circuit configured to drive the electronic switch. The control circuit is configured to operate in one of at least two operation modes. The at least two operation modes comprise a first operation mode and a second operation mode. The control circuit, in the second operation mode, is configured to perform a set of basic functions and, in the first operation mode, is configured to perform the set of basic functions and at least one additional function. The at least one additional function comprises generating a first protection signal based on a current-time-characteristic of a load current of the electronic switch and driving the electronic switch based on the first protection signal.