An adjustable planar transformer and its manufacturing method

Abstract

The invention discloses an adjustable planar transformer. The adjustable planar transformer comprises a magnetic core assembly and a winding assembly, wherein the magnetic core assembly comprises a pair of magnetic cores which are correspondingly laminated to form the complete magnetic core assembly; the winding assembly is an integrated body which consists of a PCB winding board, sandwich layer boards and guiding boards in a stacking manner; through holes are formed in the middle part of the winding assembly; and the magnetic cores run through the through holes to be laminated mutually to form the complete planar transformer with the winding assembly. According to the adjustable planar transformer provided by the invention, a conventional PCB winding board is covered with a guiding board layer; the guiding boards are provided with copper foil convex points; the copper foil convex points are in lamination and contact with copper circuits on the PCB winding board; the turns ratio of the planar transformer is changed by the number of winding rings formed by the copper foil convex points, so as to change the ratio of transformation of the planar transformation; meanwhile, only the guiding board is needed to be added in the production process of the original planar transformer for producing the planar transformer with the adjustable ratio of transformation; and in addition, the guiding board can be obtained by only improvement on the basis of the PCB.

Description

technical field [0001] The invention belongs to the technical field of planar transformers, in particular to an adjustable planar transformer and a manufacturing method thereof. Background technique [0002] In order to meet the requirements of energy saving and environmental protection, microelectronic circuits are using lower and lower operating voltages to require less and less energy lost in the circuits. The current shift toward lower supply voltages and smaller sizes is rapidly changing power supply and packaging technologies. On the other hand, since the DC switching power supply is becoming thinner and smaller, as the power semiconductor and signal semiconductor devices become smaller and smaller, how to reduce the size of the power magnetic device, which plays a key role in the power supply system, becomes crucial. important. Because the miniaturization of power transformers and inductors is the biggest difficulty, they have always been widely concerned by experts...

AI Technical Summary

Problems solved by technology

Because the structure design of the current planar transformer is relatively complex, and the structure of the planar transformer is fixed, the existing planar transformation ratio is fixed, and many applications need to use the transformation ratio of the transformer for flexible use. Only the current fixed transformation ratio is used. Ratio planar transformers are costly to replace and use, and each replacement requires manpower and material resources. In this application environment, planar transformers have poor versatility and a narrow application range, and cannot be widely used, which restricts the use of planar transformers. Promote application

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