Drive Circuit Load Detection by Cyclic Voltage Removal
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Solution Overview
Problem
Inductive loads, such as electric motors or solenoid valves, in safety-relevant applications require reliable detection of their presence and correct operation to prevent failures due to potential interruptions in electrical connections.
Innovation Solution
A method involving the cyclic application of a supply voltage to the load, followed by comparison of the electrical potential after voltage removal with a reference value to detect any interruption, using a comparator circuit and evaluation timing to determine the presence of an inductive load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous monitoring of load presence is implemented, then reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic load presence detection by cyclically applying test voltage pulses rather than continuous monitoring. The control unit periodically switches between operating mode and test mode, applying test voltage only during designated test intervals. This periodic approach maintains reliability by regularly checking load integrity while significantly reducing energy consumption compared to continuous monitoring.
2Reliability
If load presence detection is performed during operation, then reliability is improved, but measurement precision deteriorates due to operating voltage interference
Solution Approach 1:
The patent performs load presence detection before applying operating voltage to the load. The control unit first applies test voltage to detect load presence or interruptions, then subsequently applies operating voltage for normal operation. This preliminary detection approach ensures measurement precision by eliminating operating voltage interference, while maintaining operational reliability through pre-operation verification.
Solution Approach 2:
The patent segments the voltage application into distinct phases: test voltage application for detection, and operating voltage application for operation. By separating these functions temporally and using different voltage levels, the system achieves both measurement precision during detection and operational reliability, avoiding the interference that would occur if both functions were combined.
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
Effectively distinguishes between normal operating states and interruption states, ensuring reliable detection of load presence and integrity, thereby enhancing the reliability of inductive loads in safety-critical applications.
Implementation Method 1
A method may include, for example, applying and subsequently removing a supply voltage across a pair of nodes, comparing an electrical potential at one of the pair of nodes at a time after the supply voltage is removed with a reference value
Data Source
AI summary
Methods and apparatuses for detection of a presence of a load. A method may include, for example, applying and subsequently removing a supply voltage across the pair of nodes, comparing an electrical potential at one of the pair of nodes at a time after the supply voltage is removed with a reference value, and generating a signal having a value that depends upon an outcome of the comparison.