Water Purifier Power-Line Layout for EMI Isolation
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Solution Overview
Problem
Water purifiers face electromagnetic interference (EMI) issues due to the close arrangement of electrical components within a limited space, leading to reception interference and increased manufacturing costs from separate noise removal components, and require complex control algorithms for stable power distribution.
Innovation Solution
The water purifier design includes a power supply positioned at one side of the water treatment module, a first board with a bridge circuit on the other side, and separate power lines extending along different sides of the module to minimize EMI by maintaining a predetermined interval and parallel arrangement, enhancing spatial efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electrical components are arranged in a limited volume to make the water purifier smaller, then space efficiency is improved, but electromagnetic interference occurs between components and wires
Solution Approach 1:
The patent divides the internal space into distinct regions: a first region for AC power lines and a second region for external power lines. This spatial segmentation prevents electromagnetic interference while maintaining compact dimensions by assigning specific zones to different power transmission paths.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by positioning power lines at different heights (vertical dimension) and lateral positions. The AC power line is arranged at a first height while the external power line is arranged at a second height, creating vertical separation that reduces EMI without increasing the device's footprint.
2Object-affected harmful factors
If separate noisy printed circuit board is added to remove noise from AC power output, then EMI reduction performance is improved, but manufacturing cost increases and separate space is required
Solution Approach 1:
The patent extracts the noise reduction function from a separate noisy printed circuit board and implements it directly through the power supply unit's internal design. The power supply unit itself performs noise filtering and conversion without requiring an additional dedicated noise reduction component, thereby simplifying the overall system architecture.
Solution Approach 2:
The patent combines the power conversion and noise reduction functions into a single integrated power supply unit. Rather than having separate components for AC power input, noise filtering, and DC power output, these functions are merged into one unit that directly converts AC power to DC power while inherently suppressing electromagnetic interference.
3Volume of moving object
If multiple wires are formed to electrically connect components in limited space, then space efficiency is improved, but electromagnetic noise generation increases
Solution Approach 1:
The patent segments the power transmission paths by creating distinct routing zones for AC power lines and external power lines. This segmentation prevents the wires from running parallel or adjacent to each other, thereby reducing electromagnetic coupling and noise generation while maintaining efficient space utilization through organized routing paths.
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
This configuration effectively reduces EMI, improves electrical stability, and ensures stable power distribution to electronic components, while optimizing space usage without additional shielding or complex algorithms.
Implementation Method 1
a power supply positioned on one side portion of the water treatment module and converting AC power into DC power
Implementation Method 2
a first board arranged on the other side portion of the water treatment module and having a bridge circuit to branch out a portion of the external power and supply the AC power to the power supply
Data Source
AI summary
A water purifier has a power supply of a controller and a first board disposed on one side portion and the other side portion of a water treatment module, respectively, and an external power line connected to the first board to supply external power extends along a first side of the water treatment module and an AC power line for transmitting AC power to the power supply extends along a second side of the water treatment module different from the first side to be spaced a predetermined interval or more from the external power line. Therefore, the effect of noise of the AC power line on the external power line is minimized, and thus the electrical stability of the apparatus is improved.