Module power supply for planar transformer

Abstract

One end of a C1 and one end of a first section of a primary winding are connected to a dotted terminal of a primary side of a T1, the other end of the first section of the primary winding and one end of a second section of the primary winding are connected to a via hole a, and the other end of the second section of the primary winding and one end of a third section of the primary winding are connected to a via hole b. The other end of the third section of the primary winding and one end of the fourth section of the primary winding are connected to a via hole c, and the other end of the fourth section of the primary winding, one end of C2 and one end of Q1 are connected to the synonym end of T1. The planar transformer winding adopts an alternate winding method of the first section of the secondary winding, the first section of the primary winding, the second section of the secondary winding, the second section of the primary winding, the third section of the secondary winding, the third section of the primary winding, the fourth section of the secondary winding, the fourth section of the primary winding and the fifth section of the secondary winding, so that the magnetic field intensity can be minimized; in this way, leakage inductance can be reduced to the maximum extent, and efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of modular power supplies, in particular to a modular power supply for a planar transformer. Background Art

[0002] Standard brick-type modular power supplies are widely used due to their small size and high power density. Currently, the power density of modular power supplies is still increasing. To increase the power density, the conversion efficiency needs to be improved. In a modular power supply, a planar transformer is an essential electronic component, and reducing the leakage inductance of the planar transformer is an effective method to improve the efficiency of the modular power supply. Currently, there are two ways to design a planar transformer in a modular power supply: one is to use a segmented laminated printed circuit board; the other is to use an independent planar transformer. The planar transformers manufactured by these two design methods will have a relatively large leakage inductance, which will affect the improvement of the efficiency of the modular power supply and cannot adapt to a wide input voltage range; both the laminated planar transformer and the independent planar transformer have a relatively large leakage inductance, resulting in a low efficiency of the modular power supply; for the laminated planar transformer, an additional winding small board is required, the assembly is complex, it is not convenient for integration, and the distance between the primary and secondary windings is relatively large, resulting in a relatively large leakage inductance and a low efficiency of the modular power supply; for the independent planar transformer, the primary winding and the secondary winding cannot completely cover the entire layer in the width direction of the magnetic core, resulting in a reduced coupling area between the windings, and it is necessary to use flat copper wire for winding, which has a large processing difficulty, a high manufacturing cost, and a complex production process, and is not conducive to batch production. To improve this situation, the utility model provides a planar transformer that can effectively reduce its leakage inductance and improve the efficiency of the modular power supply under the original volume. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a modular power supply for a planar transformer to solve the problems mentioned in the above background art.

[0004] The technical solution of the utility model is a modular power supply for a planar transformer. One end of the transformer and one end of the first section of the primary winding are connected to the same-named end of the primary side of the transformer. The other end of the first section of the primary winding and one end of the second section of the primary winding are connected to via a. The other end of the second section of the primary winding and one end of the third section of the primary winding are connected to via b. The other end of the third section of the primary winding and one end of the fourth section of the primary winding are connected to via c. The other end of the fourth section of the primary winding, the transformer, and one end of the transformer are connected to the different-named end of the transformer.

[0005] In one embodiment, one end of the transformer and one end of the first section of the secondary winding are connected to the same-named end of the secondary side of the transformer. The other end of the first section of the secondary winding and one end of the second section of the secondary winding are connected to via d. The other end of the second section of the secondary winding and one end of the third section of the secondary winding are connected to via e.

[0006] In one embodiment, the other end of the third section of the secondary winding and one end of the fourth section of the secondary winding are connected to via f, the other end of the fourth section of the secondary winding and one end of the fifth section of the secondary winding are connected to via g, and the other end of the fifth section of the secondary winding and one end of the transformer are connected to the opposite-named end of the secondary side of the transformer.

[0007] The beneficial effects provided by the present utility model are as follows:

[0008] 1. The winding of this planar transformer adopts an alternating winding method of the first section of the secondary winding - the first section of the primary winding - the second section of the secondary winding - the second section of the primary winding - the third section of the secondary winding - the third section of the primary winding - the fourth section of the secondary winding - the fourth section of the primary winding - the fifth section of the secondary winding, which can minimize the magnetic field intensity and make the magnetic flux distribution more uniform. In this way, the leakage inductance can be minimized to the greatest extent and the efficiency can be improved;

[0009] 2. All windings of this planar transformer are wound on the same printed circuit board. By controlling the thickness of the printed circuit board, the distance between windings can be minimized. According to The smaller the coupling distance, the smaller the leakage inductance and the higher the efficiency;

[0010] 3. The primary and secondary windings of this planar transformer are segmented. Each section of the winding covers a whole layer, maximizing the area of each section of the winding in the width direction of the magnetic core and maximizing the coupling. Each section is connected through vias. In this way, the coupling area between windings can be maximized. According to The larger the coupling area, the smaller the leakage inductance and the higher the efficiency. Description of the Drawings

[0011] Figure 1 This is the first layer of the first section of the secondary winding of the present utility model;

[0012] Figure 2 This is the first layer of the first section of the primary winding of the present utility model;

[0013] Figure 3 This is the third layer of the second section of the secondary winding of the present utility model;

[0014] Figure 4 This is the fourth layer of the second section of the primary winding of the present utility model;

[0015] Figure 5 This is the fifth layer of the third section of the secondary winding of the present utility model;

[0016] Figure 6 This is the sixth layer of the third section of the primary winding of the present utility model;

[0017] Figure 7 This is the seventh layer of the fourth section of the primary winding of the present utility model;

[0018] Figure 8This is the fourth segment of the primary winding on the eighth layer of the present utility model;

[0019] Figure 9 This is the fifth segment of the secondary winding on the ninth layer of the present utility model;

[0020] Figure 10 This is one of the three-dimensional schematic diagrams of the planar transformer of the present utility model;

[0021] Figure 11 This is the other three-dimensional schematic diagram of the planar transformer of the present utility model;

[0022] Figure 12 This is the schematic diagram of the principle of the planar transformer and the module power supply circuit of the present utility model. Specific embodiments

[0023] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The following will further describe the technical solutions of the present utility model in conjunction with the drawings of the embodiments of the present utility model. The present utility model is not limited to the following specific embodiments.

[0024] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] In one embodiment, as Figures 1-12 shown, for a module power supply for a planar transformer, one end of transformer C1 and one end of the first segment of the primary winding are connected to the same-named end of the primary side of transformer T1. The other end of the first segment of the primary winding and one end of the second segment of the primary winding are connected to via a. The other end of the second segment of the primary winding and one end of the third segment of the primary winding are connected to via b. The other end of the third segment of the primary winding and one end of the fourth segment of the primary winding are connected to via c. The other end of the fourth segment of the primary winding, transformer C2, and one end of transformer Q1 are connected to the different-named end of transformer T1;

[0026] One end of transformer D1 and one end of the first section of the secondary winding are connected to the corresponding end of the secondary side of transformer T1. The other end of the first section of the secondary winding and one end of the second section of the secondary winding are connected to via d. The other end of the second section of the secondary winding and one end of the third section of the secondary winding are connected to via e. The other end of the third section of the secondary winding and one end of the fourth section of the secondary winding are connected to via f. The other end of the fourth section of the secondary winding and one end of the fifth section of the secondary winding are connected to via g. The other end of the fifth section of the secondary winding and one end of transformer D2 are connected to the opposite end of the secondary side of transformer T1;

[0027] In this planar transformer winding, the primary winding and the secondary winding are alternately wound on the printed circuit board in the height direction of the magnetic core window, and the primary and secondary winding sequences are arranged according to the principle of the minimum magnetic potential difference, so that the magnetic flux distribution is more uniform and the coupling between the primary and secondary windings is closer, thereby reducing the leakage inductance and improving the efficiency. In the width direction of the magnetic core window of this planar transformer winding, the copper foil of each layer of winding covers the entire layer, maximizing the coupling area between the primary winding and the secondary winding, thereby reducing the leakage inductance and improving the efficiency. The primary and secondary windings of this planar transformer are segmented, each segment covers a whole layer, and vias are used to connect each segment on the printed circuit board, and the number of turns design requirements of the planar transformer can be flexibly met by increasing or decreasing the number of layers of the printed circuit board. This design method is simple and reliable, does not add extra parts, is convenient for integration, and improves the power density of the module power supply;

[0028] The method of using a segmented laminated printed circuit board to design a planar transformer is adopted. In this method, the coupling distance between the primary winding and the secondary winding is relatively far. According to Formula 1, the size of the primary leakage inductance L S1 is directly proportional to the coupling distance c between the primary and secondary windings. The closer the coupling distance, the smaller the leakage inductance. Therefore, this design method has a relatively large coupling distance, which will cause a relatively large leakage inductance of the planar transformer, thereby affecting the improvement of the module power supply efficiency;

[0029]

[0030] In the formula: μ0 is the initial permeability; N1 is the number of turns of the primary side; Iav is the winding length; Ks is the winding length coefficient; I is the window width; c is the winding interval distance; b and d are the winding thicknesses.

[0031] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0032] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A module power supply for a planar transformer, characterized in that: One end of the transformer C1 and one end of the first section of the primary winding are connected to the same-name end of the primary side of the transformer T1, the other end of the first section of the primary winding and one end of the second section of the primary winding are connected to via a, the other end of the second section of the primary winding and one end of the third section of the primary winding are connected to via b, the other end of the third section of the primary winding and one end of the fourth section of the primary winding are connected to via c, the other end of the fourth section of the primary winding, the transformer C2, and one end of the transformer Q1 are connected to the opposite-name end of the transformer T1, and one end of the transformer D1 and the secondary side are connected to the via a. One end of the first section of the winding is connected to the same-name terminal of the secondary side of transformer T1, the other end of the first section of the secondary winding and one end of the second section of the secondary winding are connected to via d, the other end of the second section of the secondary winding and one end of the third section of the secondary winding are connected to via e, the other end of the third section of the secondary winding and one end of the fourth section of the secondary winding are connected to via f, the other end of the fourth section of the secondary winding and one end of the fifth section of the secondary winding are connected to via g, and the other end of the fifth section of the secondary winding and one end of the transformer D2 are connected to the opposite-name terminal of the secondary side of transformer T1.

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