Integrated structure of passive elements in LLC resonance converter realized by flexible circuit boards
View Patent ↗An integrated structure of passive elements in an LLC resonance converter realized by flexible circuit boards includes a closed magnetic circuit formed by first and second magnetic cores, a tubular, double-sided, flexible circuit board, tubular magnetic-material layer and tubular, single-sided, flexible circuit board. The single-sided circuit board is coaxially sleeved in turn from inside outwards on a magnetic core column of the closed magnetic circuit. The tubular, double-sided, circuit board is a laminated plate material formed in turn of a first insulating layer, first copper foil, insulating medium layer, second copper foil and second insulating layer. The tubular, single-sided, circuit board is a laminated plate material formed in turn of a third insulating layer, third copper foil and fourth insulating layer. The integration of a resonance capacitor, resonance inductor, shunt inductor and transformer in a LLC resonance converter is realized by using these flexible circuit boards.
1. Integrated structure of passive elements in an LLC resonance converter realized by flexible circuit boards, comprising:
a closed magnetic circuit, including a first magnetic core and a second magnetic core;
a tubular, double-sided, flexible circuit board;
a tubular magnetic-material layer; and
a tubular, single-sided, flexible circuit board coaxially sleeved in turn from inside outwards on a magnetic core column of the closed magnetic circuit, wherein
the tubular, double-sided, flexible circuit board includes a first wound, laminated plate material having in turn a first insulating layer, a first copper foil, an insulating medium layer, a second copper foil and a second insulating layer,
the leading end of the first copper foil and the tail end of the second copper foil each have a respective pad for connecting with an external circuit, and
the tubular, single-sided, flexible circuit board includes a second wound, laminated plate material having in turn a third insulating layer, a third copper foil and a fourth insulating layer, respective ends of the third copper foil each having an external circuit connecting pad.
2. Integrated structure according to claim 1 , wherein
the first and second magnetic cores are both E-shaped, arranged to form a closed magnetic circuit with three magnetic core columns, including two outer magnetic core columns and a middle magnetic core column between the two outer magnetic core columns, and
the tubular, double-sided, flexible circuit board, the tubular magnetic-material layer and the tubular, single-sided, flexible circuit board are sleeved on the middle magnetic core column.
3. Integrated structure according to claim 1 , wherein the first magnetic core and the second magnetic core are both U-shaped, constituting a closed magnetic circuit with two magnetic core columns, and wherein the tubular, double-sided, flexible circuit board, the tubular magnetic-material layer and the tubular, single-sided, flexible circuit board are sleeved on the one of the magnetic core columns.
4. Integrated structure according to claim 1 , wherein the tubular, double-sided, flexible circuit is wound in one turn or coaxially in more than one turn.
5. Integrated structure according to claim 1 , wherein the tubular, single-sided, flexible circuit is wound in one turn or coaxially in more than one turn.
6. Integrated structure according to claim 1 , wherein the insulating medium layer is a polyimide.
7. Integrated structure according to claim 1 , wherein the magnetic-material layer is a ferrite polymer.