Transformer

Abstract

A transformer comprises a magnetic core piece, a primary winding, a first secondary winding and a second secondary winding. The magnetic core piece is provided with an upper cover, a lower cover and a first wrapping post, and the first wrapping post is located between the upper cover and the lower cover. The primary winding is wound on the first wrapping post. The first secondary winding is wound on the first wrapping post and located on one side of the primary winding. The second secondary winding is wound on the first winding post and located on the other side of the primary winding. The second secondary winding is electrically connected with the first secondary winding to form a center tap structure.

Description

Technical Field

[0001] The invention relates to an electronic device, and in particular to a transformer. Background Art

[0002] In order to be suitable for high voltage use, the existing transformer must increase the turns ratio of the primary winding to the secondary winding. In addition, a plurality of ribs are arranged at intervals on the ferrite core of the existing transformer, and the primary winding and the two positive and negative half-cycle secondary windings are wound on the core in slots by one of the ribs. However, this type of slot-type transformer is not suitable for use in the center-tapped transformer structure because of the high difference in coupling coefficients between the first and second secondary windings and the primary winding due to the leakage inductance between the first and second secondary windings and the primary winding. In addition, the current difference between the positive and negative half cycles of this type of slot-type transformer is too large, resulting in an increase in copper loss. Summary of the invention

[0003] The invention relates to a transformer, which can balance the coupling coefficient between a primary winding and first and second secondary windings, and make the peak values ​​of DC power outputted in positive and negative half cycles close to improve the current sharing problem.

[0004] According to one aspect of the present invention, a transformer is provided, comprising a magnetic core, a primary winding, a first secondary winding and a second secondary winding. The magnetic core has an upper cover, a lower cover and a first winding post, and the first winding post is located between the upper cover and the lower cover. The primary winding is wound around the first winding post. The first secondary winding is wound around the first winding post and is located on one side of the primary winding. The second secondary winding is wound around the first winding post and is located on the other side of the primary winding. The second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

[0005] According to one aspect of the present invention, a transformer is provided, comprising a magnetic core, a primary winding, a first secondary winding and a second secondary winding. The magnetic core has an upper cover, a lower cover, a first winding post and a second winding post, and the first winding post and the second winding post are located between the upper cover and the lower cover. The primary winding is wound around the first winding post. The first secondary winding is wound around the first winding post or the second winding post and is located on one side of the primary winding. The second secondary winding is wound around the first winding post or the second winding post and is located on the other side of the primary winding, and the second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

[0006] According to one aspect of the present invention, a transformer is provided, comprising a magnetic core, a primary winding, a first secondary winding and a second secondary winding. The magnetic core has an upper cover, a lower cover, a first winding post, a second winding post and a third winding post, and the first winding post, the second winding post and the third winding post are located between the upper cover and the lower cover. The primary winding is wound around the second winding post. The first secondary winding is wound around the first winding post and is located on one side of the primary winding. The second secondary winding is wound around the third winding post and is located on the other side of the primary winding, and the second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

[0007] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 4 is a schematic diagram showing the appearance of a transformer according to an embodiment of the present invention.

[0009] Figure 2 FIG. 4 is a waveform diagram showing the current outputted in the positive and negative half cycles of a transformer according to an embodiment of the present invention.

[0010] Figure 3A and Figure 3B Schematic diagrams of a transformer winding structure and a corresponding transformer circuit according to an embodiment of the present invention are respectively shown.

[0011] Figure 4 FIG. 4 is a schematic diagram showing the appearance of a transformer according to another embodiment of the present invention.

[0012] Figure 5 A cross-sectional schematic diagram of a winding structure of a transformer according to an embodiment of the present invention is shown.

[0013] Figure 6 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0014] Figure 7 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0015] Figure 8 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0016] Fig. 9 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0017] Fig.10 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0018] Fig.11 FIG. 4 is a cross-sectional schematic diagram of a winding structure of a transformer according to another embodiment of the present invention.

[0019] Wherein, the reference numerals are:

[0020] 100,102-108: Transformer

[0021] 101: Transformer Circuit

[0022] 110: Magnetic core

[0023] 111: Upper cover

[0024] 112: First winding column

[0025] 113: Lower cover

[0026] 114: Second winding column

[0027] 115: Side cover

[0028] 116: The third winding column

[0029] 117: Winding rack

[0030] 11: First accommodation area

[0031] 12: Second storage area

[0032] 13: The third storage area

[0033] P1: Primary winding

[0034] S1, S2: First / Second Secondary Winding

[0035] D1: First spacing

[0036] D2: Second spacing

[0037] DC1: Direct current

[0038] DC2: Direct current

[0039] AC: Power supply

[0040] T1, T2: Metal Oxide Semiconductor Field Effect Transistor

[0041] DB1, DB2: Rectifier diodes

[0042] FC: Filter circuit

[0043] Cr: resonant capacitor

[0044] Lr: resonant inductor

[0045] Lm: Magnetizing inductance

[0046] S11, S13: First sub-winding

[0047] S12, S14: Second sub-winding

[0048] S21, S23: The third sub-winding

[0049] S22, S24: the fourth sub-winding

[0050] D1: First spacing

[0051] D2: Second spacing

[0052] E1: Extension direction

[0053] G1: air gap, first air gap

[0054] G2: Second air gap

[0055] P11: First winding part

[0056] P12: Second winding part DETAILED DESCRIPTION

[0057] The structural principle and working principle of the present invention are described in detail below in conjunction with the accompanying drawings:

[0058] Please refer to Figure 1 and Figure 2 ,in Figure 1 FIG. 1 is a schematic diagram showing the appearance of a transformer 100 according to an embodiment of the present invention. Figure 2 The waveform diagram of the current outputted in the positive and negative half cycles of the transformer 100 according to one embodiment of the present invention is shown. The transformer 100 of this embodiment can be used in a center-tapped half-bridge rectifier circuit (see Figure 3B ) to balance the coupling coefficients between the first and second secondary windings S1, S2 and the primary winding P1, thereby improving the current sharing problem. However, the transformer 100 of this embodiment can also be applied to other types of rectifier circuits, and the present invention is not limited thereto. In the following embodiments, the same components are represented by the same or similar component symbols.

[0059] Please refer to Figure 1 , the transformer 100 includes a magnetic core 110, a primary winding P1, and first and second secondary windings S1 and S2. The magnetic core 110 has an upper cover 111, a lower cover 113, and a first winding post 112, and the first winding post 112 is located between the upper cover 111 and the lower cover 113. The first secondary winding S1 is wound around the first winding post 112 and is located on one side of the primary winding P1. The second secondary winding S2 is wound around the first winding post 112 and is located on the other side of the primary winding P1, and the second secondary winding S2 is electrically connected to the first secondary winding S1 and forms a center tap structure (see Figure 3B ).

[0060] In one embodiment, the first winding post 112 has an air gap G1 (see Figure 3A ), and the primary winding P1 overlaps the air gap G1. In addition, the transformer 100 may include a winding frame 117, which is sleeved on the first winding post 112 and has a first accommodating area 11, a second accommodating area 12 and a third accommodating area 13, and the first accommodating area 11 is located between the second accommodating area 12 and the third accommodating area 13. The primary winding P1 can be wound in the first accommodating area 11, the first secondary winding S1 can be wound in the second accommodating area 12, and the second secondary winding S2 can be wound in the third accommodating area 13. In one embodiment, the upper cover 111, the lower cover 113 and the side cover 115 of the magnetic core member 110 surround the first winding post 112 to form an accommodation space for accommodating the first winding post 112, the primary winding P1 and the first and second secondary windings S1 and S2 inside the magnetic core member 110, and can be configured inside the magnetic core member 110 in a closed or semi-open manner.

[0061] In one embodiment, the primary winding P1 is wound on the first winding post 112 or the winding frame 114, and the number of turns of the primary winding P1 is greater than the number of turns of the first and second secondary windings S1 and S2. In addition, the first and second secondary windings S1 and S2 are wound on the first winding post 112 or the winding frame 114, and the first secondary winding S1 has a first distance D1 (e.g., center to center) with the primary winding P1 in the extension direction of the first winding post 112, and the second secondary winding S2 has a second distance D2 (e.g., center to center) with the primary winding P1 in the extension direction of the first winding post 112. In other words, the first and second secondary windings S1 and S2 are respectively located on the upper and lower sides of the primary winding P1, and the ratio of the first distance D1 to the second distance D2 is greater than or equal to 0.9 and less than or equal to 1.1, so that the coupling coefficient between the first and second secondary windings S1 and S2 and the primary winding P1 remains constant. In one embodiment, the turns ratio of the primary winding P1 to the first and second secondary windings S1 and S2 is, for example, 33:2:2, but the invention is not limited thereto.

[0062] The function of the transformer 100 is to use the principle of electromagnetic induction to increase or decrease the AC voltage to the appropriate AC voltage at the load end. Its structure is two sets of coils, which are insulated from each other and wound on one, two or three winding poles. The coil connected to the AC is called the primary winding P1 (primary coil), and the coil connected to the load end is called the first and second secondary windings S1 and S2 (secondary coils). When the AC is connected to the primary winding P1, a change in magnetic flux will occur, which is transmitted to the first and second secondary windings S1 and S2 through the winding poles. The changed magnetic flux causes the first and second secondary windings S1 and S2 to generate AC. The AC voltage generated by the first and second secondary windings S1 and S2 is proportional to the number of turns of the transformer 100, that is, V1 / V2=N1 / N2. Therefore, the AC at the load end can be obtained by changing the turns ratio of the transformer 100. In addition, the AC at the load end can also be filtered through the filter circuit FC and the rectifier current (including the rectifier diodes DB1 and DB2) (see Figure 4 That is, the first and second secondary windings S1, S2 are electrically connected to the rectifier circuit.

[0063] Please refer to Figure 2 According to the waveform diagram of the DC power output in the positive and negative half cycles, after rectification, the peak value of the DC power DC1 output in the positive half cycle is about 20.31 amperes, and the peak value of the DC power DC2 output in the negative half cycle is about 21.86 amperes, and the difference between the peak values ​​is 1.55 amperes. It can be seen that the transformer 100 of this embodiment arranges the first and second secondary windings S1 and S2 on both sides of the primary winding P1, respectively, so that the peak values ​​of the DC power DC1 and DC2 output in the positive and negative half cycles can be close to improve the current sharing problem.

[0064] Please refer to Figure 3A and Figure 3B, which respectively illustrate the winding structure of the transformer 100 and the corresponding transformer circuit 101 according to an embodiment of the present invention. In one embodiment, the transformer circuit 101 may include a power source AC, a plurality of metal oxide semiconductor field effect transistors T1, T2, a resonant circuit (resonant capacitor Cr and resonant inductor Lr), a primary winding P1, a first and a second secondary winding S1 and S2, a half-bridge rectifier circuit (rectifier diodes DB1, DB2) and a filter circuit FC. The power source AC is used to output an alternating current, and the primary winding P1 is used to connect the alternating current to generate a resonant inductor Lr and an exciting inductor Lm. When the alternating current is connected to the primary winding P1, a change in magnetic flux will occur, which is transmitted to the first and the second secondary windings S1, S2 through the winding column. The half-bridge rectifier circuit includes two rectifier diodes DB1, DB2, which are respectively connected between the corresponding first and the second secondary windings S1, S2 and the filter circuit FC. In the positive half cycle of the AC output, the rectifier diode DB1 located on the upper side is forward biased to allow current to pass, while the rectifier diode DB2 located on the lower side is reverse biased to prevent current from passing. Conversely, in the negative half cycle of the AC, the rectifier diode DB1 located on the upper side is reverse biased to prevent current from passing, while the rectifier diode DB2 located on the lower side is forward biased to allow current to pass. Therefore, the current passing through the first and second secondary windings S1 and S2 can generate a DC power supply after rectification by the half-bridge rectifier circuit.

[0065] Please refer to Figure 3A In one embodiment, the first secondary winding S1 located at the upper side includes parallel first sub-windings S11 and S13 and parallel second sub-windings S12 and S14, wherein the parallel first sub-windings S11 and S13 are connected in parallel and staggered with the parallel second sub-windings S12 and S14. In addition, the second secondary winding S2 located at the lower side includes parallel third sub-windings S21 and S23 and parallel fourth sub-windings S22 and S24, wherein the parallel third sub-windings S21 and S23 are connected in parallel and staggered with the parallel fourth sub-windings S22 and S24.

[0066] Please refer to Figure 4, which shows a schematic diagram of the appearance of a transformer 102 according to another embodiment of the present invention. The transformer 102 includes a first winding post 112, a second winding post 114, a primary winding P1, and first and second secondary windings S1, S2. The first winding post 112 and the second winding post 114 are parallel to each other and separated by a distance, the primary winding P1 is wound around at least one of the first winding post 112 and the second winding post 114, and the first and second secondary windings S1, S2 are wound around at least one of the first winding post 112 and the second winding post 114 and arranged on both sides of the primary winding P1. In this embodiment, two sets of primary windings P1 and first and second secondary windings S1, S2 can be accommodated simultaneously in the accommodating space enclosed by the same magnetic core member 110, wherein the first secondary winding S1 located on the upper side can have a first sub-winding S11, S13 and a second sub-winding S12, S14 respectively wound on the first winding pole 112 and the second winding pole 114, and the second secondary winding S2 located on the lower side can have a third sub-winding S21, S23 and a fourth sub-winding S22, S24 respectively wound on the first winding pole 112 and the second winding pole 114.

[0067] That is, the first and second secondary windings S1 and S2 are respectively located on the upper and lower sides of the primary winding P1, and the secondary winding S1 located on the upper side has a first spacing D1 between the primary winding P1 and the extension direction of the first winding post 112 or the second winding post 114, and the secondary winding S2 located on the lower side has a second spacing D2 between the primary winding P1 and the extension direction of the first winding post 112. The ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so that the coupling coefficient between the first and second secondary windings S1 and S2 and the primary winding P1 remains constant. In one embodiment, the turns ratio of the primary winding P1 to the first and second secondary windings S1 and S2 is, for example, 33:2:2, but the present invention is not limited thereto.

[0068] The transformer 102 of the present embodiment can be used in a center-tapped half-bridge rectifier circuit to balance the coupling coefficients between the first and second secondary windings S1, S2 and the primary winding P1, thereby improving the current sharing problem. In addition, the first winding post 112 and the second winding post 114 are respectively provided with a first air gap G1 and a second air gap G2 (see Figure 5 ), the primary winding P1 may be configured to overlap with the first air gap G1 and / or the second air gap G2 or may not overlap with the first air gap G1 and / or the second air gap G2, and the present invention is not limited to this.

[0069] For example, in Figure 5In the transformer 102, the first secondary winding S1 located on the upper side includes parallel first sub-windings S11 and S13 and parallel second sub-windings S12 and S14, wherein the parallel first sub-windings S11 and S13 are wound on the first winding post 112, and the parallel second sub-windings S12 and S14 are wound on the second winding post 114. In other words, the first winding post 112 and the second winding post 114 respectively have parallel first sub-windings S11 and S13 and parallel second sub-windings S12 and S14. In addition, the second secondary winding S2 located on the lower side includes parallel third sub-windings S21 and S23 and parallel fourth sub-windings S22 and S24, wherein the parallel third sub-windings S21 and S23 are wound on the first winding post 112, and the parallel fourth sub-windings S22 and S24 are wound on the second winding post 114.

[0070] In addition, the primary winding P1 can be wound on the first winding pole 112 and the second winding pole 114, wherein the first sub-winding S11, S13 and the second sub-windings S12, S14 respectively have a first spacing D1 with the primary winding P1, the third sub-windings S21, S23 and the fourth sub-windings S22, S24 respectively have a second spacing D2 with the primary winding P1, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so that the coupling coefficient between the first and second secondary windings S1, S2 and the primary winding P1 remains consistent.

[0071] Please refer to Figure 6 , which illustrates a cross-sectional schematic diagram of a winding structure of a transformer 103 according to another embodiment of the present invention. The difference between this embodiment and the above embodiment is that: the first secondary winding S1 located on the upper side includes parallel first sub-windings S11, S13 and parallel second sub-windings S12, S14, wherein the parallel first sub-windings S11, S13 and the parallel second sub-windings S12, S14 are wound on the first winding post 112 and are staggered. In addition, the second secondary winding S2 located on the lower side includes parallel third sub-windings S21, S23 and parallel fourth sub-windings S22, S24, wherein the parallel third sub-windings S21, S23 and the parallel fourth sub-windings S22, S24 are wound on the second winding post 114 and are staggered. That is to say, the first winding pole 112 and the second winding pole 114 respectively have corresponding multiple sub-windings, the first winding S1 located on the upper side and the primary winding P1 have a first spacing D1, and the second secondary winding S2 located on the lower side and the primary winding P1 have a second spacing D2, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1 to balance the coupling coefficient.

[0072] Please refer to Figure 7, which illustrates a cross-sectional schematic diagram of a winding structure of a transformer 104 according to another embodiment of the present invention. The present embodiment is different from the above embodiments in that: the first secondary winding S1 located on the upper side is wound on the first winding post 112, the second secondary winding S2 located on the lower side is wound on the second winding post 114, and the primary winding P1 includes a first winding portion P11 and a second winding portion P12 connected in series, wherein the first winding portion P11 is wound on the first winding post 112, and the second winding portion P12 is wound on the second winding post 114, the first secondary winding S1 located on the upper side and the first winding portion P11 have a first spacing D1, the secondary winding S2 located on the lower side and the second winding portion P12 have a second spacing D2, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so as to balance the coupling coefficient.

[0073] Please refer to Figure 8 , which illustrates a cross-sectional schematic diagram of a winding structure of a transformer 105 according to another embodiment of the present invention. The present embodiment is different from the above embodiments in that: the first secondary winding S1 located on the upper side is wound on the second winding post 114, the second secondary winding S2 located on the lower side is wound on the second winding post 114, and the primary winding P1 includes a first winding portion P11 and a second winding portion P12 connected in series, wherein the first winding portion P11 is wound on the first winding post 112, and the second winding portion P12 is wound on the second winding post 114, the first secondary winding S1 located on the upper side and the second winding portion P12 have a first spacing D1, the secondary winding S2 located on the lower side and the second winding portion P12 have a second spacing D2, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so as to balance the coupling coefficient. In the same manner, the first secondary winding S1 located on the upper side has a minimum first spacing D1 with the first winding portion P11 in the extension direction E1 of the winding direction of the first winding portion P11, and the second secondary winding S2 located on the lower side has a minimum second spacing D2 in the extension direction E1 of the winding direction of the first winding portion P11, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1 to balance the coupling coefficient. In this embodiment, the above-mentioned winding direction is the radial direction of the first winding column 112, and the minimum first and second spacings D1 and D2 refer to the minimum distances at which the first and second secondary windings S1 and S2 are perpendicular to the first winding portion P11 or the extension direction E1 of the winding direction of the first winding portion P11.

[0074] Please refer to Fig. 9, which illustrates a cross-sectional schematic diagram of a winding structure of a transformer 106 according to another embodiment of the present invention. The difference between this embodiment and the above embodiments is that: the first secondary winding S1 located on the upper side includes parallel first sub-windings S11 and S13 and parallel second sub-windings S12 and S14, wherein the parallel first sub-windings S11 and S13 are wound on the first winding post 112, and the parallel second sub-windings S12 and S14 are wound on the second winding post 114. In addition, the second secondary winding S2 located on the lower side includes parallel third sub-windings S21 and S23 and parallel fourth sub-windings S22 and S24, wherein the parallel third sub-windings S21 and S23 are wound on the first winding post 112, and the parallel fourth sub-windings S22 and S24 are wound on the second winding post 114. In addition, the primary winding P1 includes a first winding portion P11 and a second winding portion P12 connected in series, wherein the first winding portion P11 is wound on the first winding pole 112, and the second winding portion P12 is wound on the second winding pole 114, the first sub-windings S11, S13 and the first winding portion P11 have a first spacing D1, the third sub-windings S21, S23 and the first winding portion P11 have a second spacing D2, the second sub-windings S12, S14 and the second winding portion P12 have a first spacing D1, the fourth sub-windings S22, S24 and the second winding portion P12 have a second spacing D2, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1 to balance the coupling coefficient.

[0075] Please refer to Fig.10 , which is a cross-sectional schematic diagram of a winding structure of a transformer 107 according to another embodiment of the present invention. The present embodiment is different from the above-mentioned embodiments in that: the first secondary winding S1 located on the upper side is wound on the second winding pole 114, the second secondary winding S2 located on the lower side is wound on the second winding pole 114, and the primary winding P1 is wound on the first winding pole 112, that is, the primary winding P1 and the first and second secondary windings S1, S2 are not on the same winding pole, but are respectively wound on the first winding pole 112 and the second winding pole 114, wherein the first secondary winding S1 located on the upper side and the primary winding P1 or the extension direction E1 of the winding direction of the primary winding P1 have a minimum first spacing D1, and the second secondary winding S2 located on the lower side and the primary winding P1 or the extension direction E1 of the winding direction of the primary winding P1 have a minimum second spacing D2, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so as to balance the coupling coefficient. In this embodiment, the winding direction is the radial direction of the first winding pole 112, and the minimum first and second spacings D1 and D2 refer to the minimum distances between the first and second secondary windings S1 and S2 and the primary winding P1 or the extension direction E1 of the winding direction of the primary winding P1 that are perpendicular to each other.

[0076] Please refer to Fig.11 , which illustrates a cross-sectional schematic diagram of a winding structure of a transformer 108 according to another embodiment of the present invention. The difference between this embodiment and the above embodiments is that the magnetic core 110 includes a first winding post 112, a second winding post 114, and a third winding post 116. The first winding post 112, the second winding post 114, and the third winding post 116 are located between the upper cover 111 and the lower cover 113. The primary winding P1 is wound on the first winding post 112, the first secondary winding S1 located on the upper side is wound on the second winding post 114, and the second secondary winding S2 located on the lower side is wound on the third winding post 116. That is to say, the primary winding P1 and the first and second secondary windings S1 and S2 are respectively located on different winding poles, wherein the first secondary winding S1 located on the upper side has a minimum first spacing D1 with the primary winding P1 or with the extension direction E1 of the winding direction of the primary winding P1, and the second secondary winding S2 located on the lower side has a minimum second spacing D2 with the primary winding P1 or with the extension direction E1 of the winding direction of the primary winding P1, and the ratio of the first spacing D1 to the second spacing D2 is greater than or equal to 0.9 and less than or equal to 1.1, so as to balance the coupling coefficient.

[0077] It can be seen that the transformer of the above-mentioned embodiment of the present invention can be applied to the structure of a center-tapped transformer, in which the first and second secondary windings are respectively arranged on opposite sides of the primary winding. The first and second secondary windings and the primary winding can be located on the same winding pole or different winding poles. In addition to balancing the coupling coefficient, the peak value of the DC power output in the positive and negative half cycles can be made similar, so as to improve the current sharing problem and reduce the power loss (copper loss).

[0078] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A transformer, characterized in that: include: A magnetic core member having an upper cover, a lower cover and a first winding post, wherein the first winding post is located between the upper cover and the lower cover; A primary winding, wound around the first winding post; a first secondary winding, wound around the first winding post and located at one side of the primary winding; and A second secondary winding is wound around the first winding post and is located at the other side of the primary winding. The second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

2. The transformer according to claim 1, characterized in that The first winding column has an air gap, and the primary winding overlaps the air gap.

3. The transformer according to claim 1, characterized in that The first secondary winding has a first distance from the primary winding in the extension direction of the first winding post, the second secondary winding has a second distance from the primary winding in the extension direction of the first winding post, and the ratio of the first distance to the second distance is greater than or equal to 0.9 and less than or equal to 1.

1.

4. The transformer according to claim 1, characterized in that The magnetic core also includes a second winding post, and the primary winding is wound around the second winding post.

5. The transformer according to claim 4, characterized in that The first secondary winding and the second secondary winding are wound on the second winding post.

6. The transformer according to claim 1, characterized in that The primary winding is electrically connected to a resonant circuit.

7. The transformer according to claim 1, characterized in that Also includes: A winding frame is sleeved on the first winding pole and has a first accommodating area, a second accommodating area and a third accommodating area, and the first accommodating area is located between the second accommodating area and the third accommodating area, wherein the primary winding is wound in the first accommodating area, the first secondary winding is wound in the second accommodating area, and the second secondary winding is wound in the third accommodating area.

8. The transformer according to claim 1, characterized in that The first secondary winding has a plurality of sub-windings connected in parallel, and the second secondary winding has a plurality of sub-windings connected in parallel.

9. A transformer, characterized in that: include: A magnetic core member, comprising an upper cover, a lower cover, a first winding post and a second winding post, wherein the first winding post and the second winding post are located between the upper cover and the lower cover; A primary winding, wound around the first winding post; a first secondary winding, wound around the first winding post or the second winding post and located at one side of the primary winding; and A second secondary winding is wound around the first winding post or the second winding post and is located at the other side of the primary winding. The second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

10. The transformer according to claim 9, characterized in that The first secondary winding has a minimum first spacing with the primary winding or with the extension direction of the winding direction of the primary winding, the second secondary winding has a minimum second spacing with the primary winding or with the extension direction of the winding direction of the primary winding, the ratio of the first spacing to the second spacing is greater than or equal to 0.9 and less than or equal to 1.1, and the winding direction is the radial direction of the first winding pole.

11. The transformer according to claim 9, characterized in that The first secondary winding and the second secondary winding are electrically connected to a rectifier circuit.

12. A transformer, characterized in that: include: A magnetic core member, comprising an upper cover, a lower cover, a first winding post, a second winding post and a third winding post, wherein the first winding post, the second winding post and the third winding post are located between the upper cover and the lower cover; A primary winding, wound around the first winding post; a first secondary winding, wound around the second winding post and located at one side of the primary winding; and A second secondary winding is wound around the third winding post and is located at the other side of the primary winding. The second secondary winding is electrically connected to the first secondary winding and forms a center tap structure.

13. The transformer according to claim 12, characterized in that The first secondary winding has a minimum first spacing with the primary winding or with the extension direction of the winding direction of the primary winding, the second secondary winding has a minimum second spacing with the primary winding or with the extension direction of the winding direction of the primary winding, the ratio of the first spacing to the second spacing is greater than or equal to 0.9 and less than or equal to 1.1, and the winding direction is the radial direction of the second winding pole.

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