Optoelectronic Sensor Voltage Monitoring and Short Circuit Prevention
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Solution Overview
Problem
Optoelectronic sensors, such as light barriers, often indicate operational readiness even when the supply voltage is insufficient, leading to potential short circuits and undetectable malfunctions due to incorrect wiring, resulting in downtimes and tedious troubleshooting.
Innovation Solution
Incorporating a supply voltage monitoring unit that ensures the operating display only lights up when the voltage is sufficient for safe operation, with the controller activating the switching output only when operational readiness is confirmed, and monitoring both voltage and current to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor uses conventional voltage monitoring with reset thresholds of 1-5 volts, then the basic ASIC supply is monitored, but the full sensor function cannot be guaranteed and operational readiness is falsely indicated
Solution Approach 1:
The patent changes the voltage monitoring parameter from conventional reset thresholds of 1-5 volts to a minimum supply voltage of 10-30 volts that matches the sensor's actual operating requirements. This parameter change ensures that the monitoring accurately reflects the true operational readiness of the complete sensor system, not just the basic ASIC supply.
2Ease of operation
If the sensor operates with insufficient voltage, then the operating display may light up, but the switching output can be destroyed by overload due to short circuits from incorrect wiring
Solution Approach 1:
The patent implements preliminary voltage verification before enabling the switching output. The controller only activates the switching output after confirming that the minimum supply voltage is present, preventing overload destruction from incorrect wiring before it can occur.
Solution Approach 2:
The patent establishes a feedback loop where the controller continuously monitors the supply voltage and uses this information to control the switching output activation. This feedback mechanism ensures the switching output is only activated when voltage conditions are safe, preventing destruction while maintaining accurate operational indication.
3Productivity
If the sensor does not monitor the specified supply voltage, then the operating display lights up even with insufficient voltage, but troubleshooting becomes tedious and downtimes increase
Solution Approach 1:
The patent performs preliminary detection of cabling errors and insufficient voltage before they cause system failures. By checking voltage conditions in advance and preventing operation when voltage is insufficient, the system avoids malfunctions that would require tedious troubleshooting and cause downtimes.
Data Source
Figure 1~2
Figure 3
AI summary
The sensor (10) has a supply voltage monitoring unit (34) checking a supply voltage (30) by comparison with an internally produced reference voltage (32), which is a measurement for a preset minimum voltage supply of the sensor. The minimum voltage supply is in range of 10 to 30 Volts. A control unit e.g. microcontroller, determines whether the supply voltage is available as a function of the status of the sensor. A display (36) e.g. green LED, displays whether the control unit detects the status or not. The reference voltage is balanced by laser-trimming of the control unit. An independent claim is also included for a method for monitoring a supply voltage of an optoelectronic sensor.