MOSFET Switch Protection Circuit for Multifunctional Bed Arc Control
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Solution Overview
Problem
The service life of switch circuits in multifunctional beds is compromised due to excessive instantaneous conduction current and electric arc generation during posture control, leading to higher equipment costs and reduced reliability.
Innovation Solution
A multifunctional bed with a switch control device that includes a micro control unit, MOSFET unit, and switch detection unit, which sets a time delay for electric signal transmission to prevent arc extinguishing, ensuring safe and stable operation by delaying the conduction of electric signals through the MOSFET unit after a preset arc extinguishing time, thereby protecting the switch circuit from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch control device directly transmits electric signals without time delay, then the response speed is fast, but the switch circuit is damaged due to excessive instantaneous conduction current and electric arc generation
Solution Approach 1:
The micro control unit performs preliminary detection of the switch state before transmitting the electric signal. When the switch is detected to be closed, the controller delays the signal transmission for a preset time period, allowing the circuit to prepare and avoiding excessive instantaneous current and electric arcs, thus protecting the switch circuit.
2Reliability
If separate control signal path and electrical signal path are used, then the control function is complete, but the system complexity and cost increase
Solution Approach 1:
The patent merges the control signal path and electrical signal path into a single integrated transmission path. The micro control unit directly transmits control signals through the same circuit that carries electrical power, eliminating the need for separate control lines and reducing system complexity while maintaining complete control functionality.
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
The solution effectively prolongs the service life of switch circuits by preventing damage from excessive current and arcs, simplifies the manufacturing process, reduces costs, and enhances the reliability and safety of the multifunctional bed's control system.
Implementation Method 1
the micro control unit presets arc extinguishing time; after the switch group is started by the user, the MOSFET unit is controlled to be switched on after delaying the arc extinguishing time period
Data Source
AI summary
A multifunctional bed, a multi-drive switch protection circuit and its control device, wherein in the multifunctional bed, when a switch group is not triggered to start by a user, all electric signal transmission paths are in a disconnected state, and after the switch group is operated to start by the user, an MOSFET unit is controlled to be conducted after delaying an arc extinguishing time period according to the arc extinguishing time preset by a micro control unit, so that the corresponding electric signal transmission paths are conducted, and a load driving device connected with the switch group runs after the switch group is triggered to start and the arc extinguishing time period is separated, so that a bed component of a bed main body is driven to adjust the corresponding posture.