AC-DC Power Supply Perpendicular Switching Line Noise Reduction
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Solution Overview
Problem
Existing AC-DC power conversion systems are bulky due to the placement of multiple components on a single circuit board, leading to increased switching noise affecting the alternating current input portion through electromagnetic induction.
Innovation Solution
The AC-DC power supply design includes a circuit board with a diode bridge, coil, diode, switching line, and switching element, where part of the switching line is oriented perpendicular to the alternating-current input line, and an EMC countermeasure member is used to reduce noise interference, allowing for a compact system with minimized switching noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple components are mounted on a single circuit board to reduce system size, then the system becomes more compact, but switching noise affects the alternating current input portion through electromagnetic induction
Solution Approach 1:
The patent applies dimensional arrangement by positioning the switching line perpendicular to the alternating-current input line on the circuit board. This spatial orientation in a different dimension (orthogonal arrangement) reduces electromagnetic coupling between the switching noise path and the input line, thereby mitigating noise interference while maintaining the compact single-board configuration.
2Area of stationary object
If components are connected through lines to reduce size, then the system becomes compact, but electromagnetic induction causes switching noise to influence the alternating current input portion
Solution Approach 1:
The patent applies local quality by specifically designing the switching line's path and orientation only in the region where it intersects with the alternating-current input line. The perpendicular arrangement is implemented locally at the crossing point to minimize electromagnetic coupling, while other parts of the circuit board can be arranged for optimal electrical performance. This localized optimization reduces noise without requiring complete redesign of the entire board layout.
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 reduces the influence of switching noise on the alternating-current input line, enabling a more compact AC-DC power supply and motor design with reduced electromagnetic interference, suitable for various systems.
Implementation Method 1
a diode bridge that rectifies the alternating current input via the alternating-current input terminal
Implementation Method 2
a switching noise generated from the line among the reactor (coil), the reverse blocking diode, and the switching element can exert an influence on the alternating current input portion, due to electromagnetic induction
Data Source
AI summary
An alternating-current (AC)—direct-current (DC) power supply includes a circuit board including an alternating-current input terminal to which an alternating current is input and a direct-current output terminal from which a direct current is output. The AC-DC power supply includes a diode bridge that rectifies the alternating current input via the alternating-current input terminal, an alternating-current input line that electrically connects the alternating-current input terminal and the diode bridge, a coil connected to the diode bridge, a diode connected to the direct-current output terminal, a switching line that electrically connects the coil and the diode, and a switching element connected to the switching line. A portion of the switching line is disposed at right angles to a portion of the alternating-current input line.