Inductive Load Control Device Short-Circuit Detection
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Solution Overview
Problem
Existing inductive load control devices fail to accurately detect short-circuit abnormalities in inductive loads due to variations in current paths caused by short-circuit locations, relying solely on load current values which can lead to undetected short-circuits.
Innovation Solution
An inductive load control device incorporating an H-bridge circuit, energization controller, load current detector, regenerative current detector, and short-circuit determination processor that uses both load current and regenerative current values to determine short-circuit abnormalities, switching from energized to regenerative states based on threshold values and mask times to account for varying current modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only load current value is used for short-circuit detection, then the detection method is simple, but short-circuit abnormalities cannot be accurately detected due to variations in current paths
Solution Approach 1:
The detection method is segmented into multiple independent detection dimensions: load current detection during energization and regenerative current detection during non-energization. By dividing the detection into separate phases with different current paths, the system can identify short-circuits regardless of which specific path is affected, thereby improving detection accuracy without requiring a single complex detection mechanism.
Solution Approach 2:
The detection approach transitions from a single-dimensional load current measurement to a two-dimensional detection system that measures both load current and regenerative current. This dimensional expansion allows the system to detect short-circuits through multiple current path modes, overcoming the limitation of single-path detection and significantly improving measurement precision.
2Measurement precision
If both load current and regenerative current are monitored, then short-circuit detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system maintains continuous monitoring of current throughout both energization and non-energization phases. By keeping the detection function active and continuous across different operational states, the system achieves comprehensive short-circuit detection without requiring separate intermittent detection mechanisms, thereby managing complexity through efficient continuous operation rather than multiple discrete systems.
Solution Approach 2:
The current detection system serves multiple functions: it monitors load current during energization for normal operation control, monitors regenerative current during non-energization for short-circuit detection, and provides comprehensive protection across different operational modes. This multi-functionality reduces the need for separate dedicated detection systems for each purpose, managing overall device complexity while improving detection accuracy.
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
Accurately detects short-circuit abnormalities regardless of current path modes, preventing undetected short-circuits and ensuring reliable operation and protection of the inductive load control device.
Implementation Method 1
For a method of constant current control for an inductive load such as a stepping motor
Implementation Method 2
the load current detector is configured to detect a load current flowing through a switching element that is turned on in the energized state
Data Source
AI summary
In an inductive load control device, an energization controller controls an operation of an H-bridge circuit to switch from an energized state to a regenerative state when a load current value is equal to or greater than a first threshold value at a time after a mask time has elapsed from a start time of a reference cycle, and a short-circuit determination processor determines whether the short-circuit abnormality has occurred based on whether the load current value is equal to or greater than a second threshold value greater than the first threshold value. The short-circuit determination processor further determines whether the short-circuit abnormality has occurred based on the regenerative current value in the regenerative state when the load current value does not reach the second threshold value within the mask time.