Latching Relay System with Inductance Component for Magnetic Interference
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Solution Overview
Problem
Latching relays experience operational failures due to high switching voltages when installed in close proximity, leading to potential failures during abnormal power source voltage drops, particularly in vehicular applications, where increasing mounting density is desired while minimizing weight and cost.
Innovation Solution
Incorporating an inductance component and an assisting energization control unit to generate magnetism that assists the operation of latching relays, either by canceling out the influence of adjacent permanent magnets or by synchronizing energization to reduce switching voltage requirements, allowing for reliable operation at lower voltages and increased component density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If latching relays are arranged close to each other to increase mounting density, then the mounting density increases, but mutual interference between permanent magnets occurs causing switching voltage to rise or lower
Solution Approach 1:
A magnetic shield plate is introduced as an intermediary component between adjacent latching relays. This shield plate blocks or redirects the magnetic flux from permanent magnets, preventing direct interference between neighboring relays. The shield plate acts as a magnetic barrier that maintains the integrity of each relay's magnetic field while allowing close spacing for high mounting density.
Solution Approach 2:
The magnetic field space around each latching relay is segmented by introducing magnetic shield plates. These plates create separate magnetic zones, isolating the permanent magnet fields of adjacent relays. This segmentation prevents the superposition of magnetic fluxes that would otherwise cause switching voltage instability.
2Reliability
If magnetic shield plates are used to reduce electromagnetic interference, then interference is reduced, but the device weight increases and mounting density decreases
Solution Approach 1:
Magnetic shield plates are strategically positioned only in specific locations where magnetic interference occurs between adjacent latching relays. Rather than enclosing entire relays or using heavy ferromagnetic materials throughout, the shield plates are placed locally at critical interference zones, providing targeted protection while minimizing overall weight and space consumption.
3Use of energy by moving object
If latching relays are used instead of common relays to reduce power consumption, then power consumption decreases, but switching voltage becomes sensitive to permanent magnet interference
Solution Approach 1:
Magnetic shield plates serve as intermediaries that protect the sensitive switching mechanism of latching relays from external magnetic interference. By blocking stray flux from adjacent permanent magnets, the shield plates ensure that the switching voltage remains stable and predictable, enabling reliable operation of low-power latching relays in high-density configurations.
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 reduces switching voltage requirements, suppresses interference between adjacent latching relays, and enables reliable operation even at low voltages, thereby enhancing the reliability and mounting density of latching relay systems.
Implementation Method 1
at least one inductance component disposed close to the latching relay and generating magnetism when energized
Implementation Method 2
latching relays include a permanent magnet and a control electric coil and have a function of maintaining, on their own, a state of an electric contact
Data Source
AI summary
A latching relay system includes a latching relay that comprises a permanent magnet and a control electric coil and has a function of self-maintaining a state of an electric contact, at least one inductance component that is disposed close to the latching relay and has a function of generating magnetism when energized, and an assisting energization control unit that energizes the inductance component temporarily when the state of the electric contact of the latching relay is switched, and assists an operation of the latching relay by the magnetism generated by the inductance component.