Switching power supply
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MURATA MFG CO LTD
- Filing Date
- 2024-03-05
- Publication Date
- 2026-06-09
AI Technical Summary
【0012】 この発明によれば、ノイズ低減部品を用いることなくノイズ平衡化回路を構成し、かつ、スイッチング動作に起因する電磁雑音の発生を相殺し、スイッチングノイズの輻射または伝導に起因してシャーシを伝導するコモンモードノイズを抑制するスイッチング電源装置を高効率かつ小型に形成できる。
Smart Images
Figure 0007871950000001 
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Figure 0007871950000003
Abstract
Claims
1. Input capacitor and, A first switching element and a second switching element are electrically connected to the input capacitor, An inductor having a first terminal and a second terminal, Output capacitor and, A circuit board on which the input capacitor, the first switching element, the second switching element, the inductor, and the output capacitor are mounted, Equipped with, The aforementioned circuit board is A first wiring pattern that electrically connects the connection nodes of the first switching element and the second switching element to the first terminal, A second wiring pattern that electrically connects the second terminal and the output capacitor, It has, The aforementioned inductor is A first winding positioned close to the circuit board, A second winding is positioned further from the circuit board than the first winding and is connected in series with the first winding, A magnetic core containing the first winding and the second winding, Equipped with, The first winding is electrically connected to the first terminal, and the second winding is electrically connected to the second terminal. The area of the first wiring pattern is physically smaller than the projected area of the inductor. The area of the second wiring pattern is physically approximately the same as or larger than the projected area of the inductor. The input capacitor, the first wiring pattern, the second wiring pattern, and the output capacitor constitute a noise balancing circuit consisting of an electrically closed circuit. Switching power supply.
2. The circuit board has a reference potential pattern that forms the reference potential of the switching power supply device. The aforementioned reference potential pattern is formed in a region that overlaps with the mounting area of the inductor when the circuit board is viewed in plan view. A switching power supply device according to claim 1.
3. The circuit board has an input wiring pattern that is electrically connected to the input capacitor. The input wiring pattern is formed in a region that overlaps with the mounting area of the inductor when the circuit board is viewed in plan view. A switching power supply device according to claim 1 or claim 2.
4. A portion of the second wiring pattern is formed in a region that overlaps with the mounting area of the inductor when the circuit board is viewed in plan view. A switching power supply device according to claim 1 or claim 2.
5. The magnetic core has a bottom surface, a first side surface, and a second side surface. The first terminal is formed across the bottom surface and the first side surface, The second terminal is formed across the bottom surface and the second side surface, The area formed on the first side surface of the first terminal is smaller than the area formed on the second side surface of the second terminal. A switching power supply device according to claim 1 or claim 2.
6. When the inductor is viewed from above, the outer shape of the second winding is larger than the outer shape of the first winding. A switching power supply device according to claim 1 or claim 2.
7. The aforementioned inductor is Having at least one third winding electrically connected between the first winding and the second winding, The inner end of the first winding is electrically connected to the first terminal. The outer end of the second winding is electrically connected to the second terminal. A switching power supply device according to claim 1 or claim 2.
8. Input capacitor and, A first switching element and a second switching element are electrically connected to the input capacitor, An inductor having a first terminal and a second terminal, Output capacitor and, A circuit board on which the input capacitor, the first switching element, the second switching element, the inductor, and the output capacitor are mounted, Equipped with, The aforementioned circuit board is A first wiring pattern that electrically connects the connection nodes of the first switching element and the second switching element to the first terminal, A second wiring pattern that electrically connects the second terminal and the output capacitor, It has, The aforementioned inductor is A columnar magnetic core, The fourth winding wrapped around the magnetic core, The magnetic core is wound around a fifth winding outside of the fourth winding and connected in series with the fourth winding, The fourth winding is electrically connected to the first terminal, and the fifth winding is electrically connected to the second terminal. The area of the first wiring pattern is smaller than the area of the second wiring pattern. The inductor, the first wiring pattern, and the second wiring pattern have approximately the same physical size as the inductor and constitute a noise balancing circuit consisting of an electrically closed circuit. Switching power supply.
9. Input capacitor and, An inductor having a first terminal and a second terminal, A first switching element and a second switching element are electrically connected to the inductor, Output capacitor and, A circuit board on which the input capacitor, the first switching element, the second switching element, the inductor, and the output capacitor are mounted, Equipped with, The aforementioned circuit board is A first wiring pattern that electrically connects the connection nodes of the first switching element and the second switching element to the first terminal, A second wiring pattern that electrically connects the second terminal and the input capacitor, It has, The aforementioned inductor is A first winding positioned close to the circuit board, A second winding is positioned further from the circuit board than the first winding and is connected in series with the first winding, A magnetic core containing the first winding and the second winding, Equipped with, The first winding is electrically connected to the first terminal, and the second winding is electrically connected to the second terminal. The area of the first wiring pattern is physically smaller than the projected area of the inductor. The area of the second wiring pattern is physically approximately the same as or larger than the projected area of the inductor. The input capacitor, the second wiring pattern, and the output capacitor constitute a noise balancing circuit consisting of an electrically closed circuit. Switching power supply.
10. Input capacitor and, A first switching element and a second switching element are electrically connected to the input capacitor, An inductor having a first terminal and a second terminal, Output capacitor and, A circuit board on which the input capacitor, the first switching element, the second switching element, the inductor, and the output capacitor are mounted, Equipped with, The aforementioned circuit board is A first wiring pattern that electrically connects the connection nodes of the first switching element and the second switching element to the first terminal, A second wiring pattern that electrically connects the second terminal and the output capacitor, It has, The aforementioned inductor is A sixth winding having one end electrically connected to the first terminal and the other end electrically connected to the second terminal, A magnetic core around which the sixth winding is wound, Equipped with, The sixth winding is positioned such that one end is closer to the circuit board than the other end. The area of the first wiring pattern is physically smaller than the projected area of the inductor. The area of the second wiring pattern is physically approximately the same as or larger than the projected area of the inductor. The input capacitor, the first wiring pattern, the second wiring pattern, and the output capacitor constitute a noise balancing circuit consisting of an electrically closed circuit. Switching power supply.