Power supply substrate, power supply unit, and refrigerating device
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Solution Overview
Problem
Existing power source boards in refrigeration apparatuses face challenges in minimizing size while effectively reducing common-mode noise, leading to increased costs due to the large size of four-wire common-mode choke coils required for noise cancellation.
Innovation Solution
The use of a power source board with a three-wire first common-mode choke coil and a two-wire second common-mode choke coil, combined with a noise cancelling board with a four-wire third common-mode choke coil, allows for effective common-mode noise reduction while minimizing the board's size and cost, and simplifies the layout and routing of wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a four-wire common-mode choke coil is used to reduce common-mode noise, then noise cancellation effectiveness is improved, but the board area and manufacturing cost increase
Solution Approach 1:
The patent divides the noise cancellation function into multiple smaller choke coils (first common-mode choke coil with three wires and second common-mode choke coil with two wires) instead of using a single large four-wire choke coil. Each smaller coil handles a portion of the noise cancellation task, allowing them to be arranged more compactly on the board while collectively achieving the required noise reduction effectiveness.
2Object-affected harmful factors
If a four-wire common-mode choke coil is used to reduce common-mode noise, then noise cancellation effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the single large choke coil into multiple smaller choke coils with fewer wires each. This segmentation reduces the manufacturing complexity and cost of each individual component, and the overall assembly becomes more cost-effective while maintaining the required noise cancellation performance.
3Area of stationary object
If the power source board size is minimized, then manufacturing cost and ease of maintenance are improved, but common-mode noise reduction effectiveness deteriorates
Solution Approach 1:
By dividing the noise cancellation function across multiple smaller choke coils, the patent enables compact arrangement on a minimized board area while collectively achieving effective common-mode noise reduction. The segmented approach allows optimal space utilization without sacrificing noise cancellation effectiveness.
Solution Approach 2:
The patent combines the functionality of multiple smaller choke coils to achieve the noise cancellation effect of a larger choke coil. The first common-mode choke coil and second common-mode choke coil work together in conjunction with the noise cancelling board to provide cumulative noise reduction that matches or exceeds the performance of a single large four-wire choke coil.
4Ease of manufacture
If wire routing is simplified, then ease of manufacture and assembly are improved, but noise cancellation effectiveness may deteriorate
Solution Approach 1:
The segmented choke coil configuration with fewer wires per coil simplifies the routing complexity compared to a single four-wire choke coil. The reduced wire count per component and more modular layout make routing easier while the distributed arrangement of multiple coils maintains effective noise cancellation across different signal 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 achieves substantial common-mode noise reduction without significantly increasing the size of the power source board, thereby reducing manufacturing costs and allowing for easier maintenance and cooling of heat-generating components within the refrigeration apparatus.
Implementation Method 1
two four-wire common-mode choke coils (143, 144) are mounted side by side
Implementation Method 2
The first common-mode choke coil (27) and the second common-mode choke coil (28) reduce a common-mode noise
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A power source board (20) includes a first power generation circuit (24) and a second power generation circuit (25) generating three-phase first output power and single-phase second output power, respectively, based on input AC power from a three-phase four-wire AC power source (91). The power source board (20) further includes: a three-wire first common-mode choke coil (27) connected to a three-phase wire set (31r, 31s, 31t) between an input terminal (21) and the first power generation circuit (24); and a two-wire second common-mode choke coil (28) connected to a predetermined wire (31s) and to the neutral point wire (31n) between the input terminal (21) and the second power generation circuit (25).