CN113012907A

CN113012907A - Flat-plate transformer of bias-free voltage push-pull circuit

Info

Publication number: CN113012907A
Application number: CN202110222861.4A
Authority: CN
Inventors: 范喆; 孙楚昕; 齐召
Original assignee: Xian Microelectronics Technology Institute
Current assignee: Xian Microelectronics Technology Institute
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-06-22
Anticipated expiration: 2041-02-26
Also published as: CN113012907B

Abstract

The invention provides a flat transformer of a bias-free voltage push-pull circuit, which comprises a flat transformer body, wherein the flat transformer body comprises a main power transformer T2, a first primary winding N1, a second primary winding N2, a third secondary winding N3 and a fourth secondary winding N4; one side of the main power transformer T2 is connected with a first primary winding N1 and a second primary winding N2; the other side is connected with a third secondary winding N3 and a fourth secondary winding N4; the flat-plate transformer body is internally connected with an equivalent capacitor C1; the flat-plate transformer is simple in structure, convenient to operate, good in consistency, convenient to miniaturize products, and capable of improving product reliability, and the internal design is effective in secrecy of internal data.

Description

Flat-plate transformer of bias-free voltage push-pull circuit

Technical Field

The invention relates to the technical field of non-bias voltage of a flat transformer, in particular to a flat transformer of a non-bias voltage push-pull circuit.

Background

The push-pull topological circuit at the present stage has the problem of transformer magnetic biasing, so that the reliability of the circuit topology is certain lack, the magnetic biasing phenomenon of the transformer is realized by externally connecting a capacitor on the transformer as the magnetic biasing of the transformer, but the design occupies the space of the transformer, so that the data of the externally connected capacitor is exposed outside the transformer, and the confidentiality effect cannot be realized.

Disclosure of Invention

The invention provides a flat transformer without a bias voltage push-pull circuit, which is simple in structure, convenient to operate, good in consistency, convenient for product miniaturization and product reliability improvement, and effective in internal design to play a role in confidentiality of internal data.

The invention is realized by the following technical scheme:

a flat transformer of a bias-free voltage push-pull circuit comprises a flat transformer body, wherein the flat transformer body comprises a main power transformer T2, a first primary winding N1, a second primary winding N2, a third secondary winding N3 and a fourth secondary winding N4; one side of the main power transformer T2 is connected with a first primary winding N1 and a second primary winding N2; the other side is connected with a third secondary winding N3 and a fourth secondary winding N4; the flat-plate transformer body is internally connected with an equivalent capacitor C1.

Preferably, the equivalent capacitor C1 is connected to the same-name terminal points of the first primary winding N1 and the second primary winding N2.

Preferably, the equivalent capacitor C1 is arranged by overlapping several insulating layers and copper sheets.

Further, the top layer and the bottom layer of the equivalent capacitor C1 are respectively provided with an insulating layer.

Furthermore, the insulating layer and the copper sheet sequentially comprise an insulating layer A layer, a copper sheet B layer, an insulating layer C layer, a copper sheet D layer and an insulating layer E layer from the top layer to the bottom layer of the equivalent capacitor C1.

More preferably, the copper sheet B layer is a copper sheet connected with a dotted terminal of the first primary winding N1; the copper sheet D layer is a copper sheet connected with the same-name end point of the second primary winding N2.

More preferably, the equivalent capacitance C1 is equal to the capacitance of the insulating layer C.

Still more preferably, the capacitance formula of the capacitor of the insulating layer C is:

C＝ε*S/d

wherein C is capacitance; d is the distance between the copper sheet B layer and the copper sheet D layer; s is the effective area of the copper sheet B layer and the copper sheet D layer in superposition; ε represents the dielectric constant of the insulating layer C.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention provides a flat transformer without a bias voltage push-pull circuit, which can offset the bias phenomenon of the transformer without an external capacitor by arranging the capacitor in the flat transformer, thereby reducing the spatial arrangement of the flat transformer, and meanwhile, the capacitor is arranged in the flat transformer, so that the data information of the internal capacitor cannot be exposed outside, thereby playing a secret effect.

Further, the equivalent capacitor C1 is connected to the end points of the first primary winding N1 and the second primary winding N2, and the equivalent capacitor C1 is connected to the end points of the first primary winding N1 and the second primary winding N2, so that the stability of the connection of the equivalent capacitor C1 in the flat-plate transformer is improved, and the magnetic bias phenomenon of the transformer is counteracted through the internal capacitor.

Furthermore, equivalent capacitance C1 has improved equivalent capacitance C1's functional stability through the mutual stack setting of a plurality of insulating layer and copper sheet.

Furthermore, the top layer and the bottom layer of the equivalent capacitor C1 are respectively provided with an insulating layer, so that the influence of external voltage on the inside of the equivalent capacitor C1 is avoided, and the equivalent capacitor C1 is protected.

Further, the insulating layer and the copper sheet sequentially comprise an insulating layer A layer, a copper sheet B layer, an insulating layer C layer, a copper sheet D layer and an insulating layer E layer from the top layer to the bottom layer of the equivalent capacitor C1, wherein the copper sheet B layer is the copper sheet connected with the dotted terminal point of the first primary winding N1; the copper sheet D layer is a copper sheet connected with the dotted terminal point of the second primary winding N2, wherein the value of the equivalent capacitor C1 is equal to the value of the capacitor of the insulating layer C layer, the value of the equivalent capacitor C1 can be determined by calculating the value of the capacitance of the insulating layer C layer, the value change of the equivalent capacitor C1 is determined, and the magnetic biasing phenomenon of the transformer can be conveniently controlled.

Drawings

FIG. 1 is a block diagram of a main power transformer according to the present invention;

fig. 2 is a schematic structural diagram of an internal superimposed layer of the equivalent capacitor C1 in the present invention.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

The invention provides a flat transformer of a bias-free voltage push-pull circuit, which comprises a flat transformer body, wherein the flat transformer body comprises a main power transformer T2, a first primary winding N1, a second primary winding N2, a third secondary winding N3 and a fourth secondary winding N4; one side of the main power transformer T2 is connected with a first primary winding N1 and a second primary winding N2; the other side is connected with a third secondary winding N3 and a fourth secondary winding N4; the flat-plate transformer body is internally connected with an equivalent capacitor C1.

The equivalent capacitor C1 is connected to the dotted terminals of the first primary winding N1 and the second primary winding N2, the equivalent capacitor C1 is connected to the dotted terminals of the first primary winding N1 and the second primary winding N2, the stability of the connection of the equivalent capacitor C1 in the flat-plate transformer is improved, and the magnetic biasing phenomenon of the transformer is counteracted through the internal capacitor; the equivalent capacitor C1 is arranged by overlapping a plurality of insulating layers and copper sheets, so that the functional stability of the equivalent capacitor C1 is improved; the top layer and the bottom layer of the equivalent capacitor C1 are respectively arranged by adopting insulating layers, so that the influence of external voltage on the inside of the equivalent capacitor C1 is avoided, and the equivalent capacitor C1 is protected.

The insulating layer and the copper sheet of the present invention sequentially include an insulating layer a, a copper sheet B, an insulating layer C, a copper sheet D, and an insulating layer E along the top layer to the bottom layer of the equivalent capacitor C1, as shown in fig. 2.

The copper sheet B layer is a copper sheet connected with the dotted terminal point of the first primary winding N1; the copper sheet D layer is a copper sheet connected with the dotted terminal point of the second primary winding N2, the value of the equivalent capacitor C1 is equal to that of the capacitor of the insulating layer C layer, the value of the equivalent capacitor C1 can be determined by calculating the value of the capacitance of the insulating layer C layer, the value change of the equivalent capacitor C1 is determined, and the magnetic biasing phenomenon of the transformer can be conveniently controlled.

The capacitance formula of the capacitor of the insulating layer C is as follows:

C＝ε*S/d

The magnitude of this value can be varied by three methods of varying the copper layer area, the copper layer spacing, and the use of insulating materials of different dielectric constants.

Examples

In the flat-plate transformer body, one side of a main power transformer T2 is connected with a first primary winding N1 and a second primary winding N2, the other side of the main power transformer T3578 is connected with a third secondary winding N3 and a fourth secondary winding N4, meanwhile, an equivalent capacitor C1 is connected and arranged at the same-name end points of the first primary winding N1 and the second primary winding N2, and the equivalent capacitor C1 releases the energy through absorbing the energy generated when magnetic biasing occurs in the next switching period to achieve the effect of uniform magnetic biasing, so that the magnetic biasing phenomenon of the transformer is counteracted.

Claims

1. A flat transformer of a bias-free voltage push-pull circuit is characterized by comprising a flat transformer body, wherein the flat transformer body comprises a main power transformer T2, a first primary winding N1, a second primary winding N2, a third secondary winding N3 and a fourth secondary winding N4; one side of the main power transformer T2 is connected with a first primary winding N1 and a second primary winding N2; the other side is connected with a third secondary winding N3 and a fourth secondary winding N4; the flat-plate transformer body is internally connected with an equivalent capacitor C1.

2. The planar transformer of the unbiased voltage push-pull circuit of claim 1, wherein the equivalent capacitor C1 is connected between the dotted terminals of the first primary winding N1 and the second primary winding N2.

3. The planar transformer of claim 1, wherein the equivalent capacitor C1 is formed by stacking copper sheets and insulating layers.

4. The planar transformer of the unbiased magnetic voltage push-pull circuit as claimed in claim 3, wherein the top layer and the bottom layer of the equivalent capacitor C1 are respectively provided with an insulating layer.

5. The planar transformer of claim 3, wherein the insulating layer and the copper sheet sequentially comprise an insulating layer A, a copper sheet B, an insulating layer C, a copper sheet D and an insulating layer E from top to bottom along the equivalent capacitance C1.

6. The planar transformer of claim 5, wherein the copper sheet B layer is a copper sheet to which a dotted terminal of the first primary winding N1 is connected; the copper sheet D layer is a copper sheet connected with the same-name end point of the second primary winding N2.

7. The planar transformer of claim 5, wherein the equivalent capacitance C1 is equal to the capacitance of the insulating layer C.

8. The planar transformer of the unbiased magnetic voltage push-pull circuit as claimed in claim 5, wherein the capacitance formula of the capacitor of the insulating layer C is:

C＝ε*S/d