Hardware-Based Anti-Pinch Circuit for Lifting Device Motor Reversal
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Solution Overview
Problem
Existing hub shifters and lifting devices lack effective anti-trap protection, leading to safety concerns and high manufacturing costs, with existing solutions relying on complex software and sensors that are not reliable.
Innovation Solution
A hardware-only anti-trap circuit using two relays and an electric motor, with a switch-on circuit, blocking circuit, and backup blocking circuit to stop and reverse the motor in case of obstruction, implemented solely through hardware without software, ensuring safe and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If software and sensors are used for anti-trap protection, then safety function is provided, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent replaces complex software control and sensor systems with a purely hardware-based circuit solution. The anti-trap function is achieved through hardware circuits including a blocking circuit with transistors Q3-Q6, diodes D1-D6, and resistors R1-R8 that directly control motor reversal when obstruction is detected, eliminating the need for software processing and complex sensors.
Solution Approach 2:
The patent uses simple, inexpensive hardware components (standard transistors, diodes, resistors) to create a reliable anti-trap protection system. These basic electronic components are far cheaper than sophisticated sensors and software systems, while providing sufficient safety functionality through direct hardware control of motor reversal.
2Reliability
If software control is used for anti-trap function, then anti-trap protection is provided, but software security certifications are required and reliability is reduced
Solution Approach 1:
The patent eliminates software control entirely and replaces it with a hardware-based circuit solution. The anti-trap protection is implemented through hardware circuits that directly control motor reversal when obstruction is detected, avoiding all software security certification requirements while improving reliability through deterministic hardware response.
3Reliability
If blocking circuit is used to stop motor rotation, then anti-trap protection is provided, but device complexity increases
Solution Approach 1:
The patent divides the anti-trap protection function into separate, modular circuit blocks: a blocking circuit (Q3-Q6, D1-D6, R1-R8) for stopping motor rotation and a backup blocking circuit for redundancy. Each circuit block is independently designed with specific components, making the overall system more manageable and less complex than integrated solutions.
Solution Approach 2:
The patent implements a backup blocking circuit that provides redundant anti-trap protection in case the primary blocking circuit fails. This pre-planned redundancy ensures continued safety functionality without requiring complex control systems, as the backup circuit is already in place and ready to activate if needed.
Data Source
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AI summary
The present invention discloses a lifting circuit and a lifting device with anti-pinch protection, wherein the lifting circuit comprises two relays and an electric motor. The forward or reverse rotation of the electric motor is controlled by means of the two relays. The lifting circuit further comprises an anti-pinch protection circuit, which has a switching circuit, a blocking circuit, and a backup blocking circuit. The switching circuit is used to maintain the normal operation of the electric motor as long as no blockage occurs during the operating process. The blocking circuit is used to cause the electric motor to stop rotating and move in the opposite direction if a blockage occurs during the operating process. The backup blocking circuit is identical in structure to the blocking circuit and is used to ensure the anti-pinch protection function of the anti-pinch protection circuit in the event of a failure of the blocking circuit.The invention provides a concept for a hardware-based clamping protection circuit that can cause the stopping and reversing of the movement of moving components.