Planar transformer, circuit board and power supply equipment

Abstract

The invention relates to the field of planar transformers, in particular to a planar transformer, a circuit board and power equipment, the planar transformer comprises a magnetic core module and a winding module, the magnetic core module comprises a first magnetic core side column, a second magnetic core side column and a magnetic core middle column, the winding module sleeves the magnetic core middle column, and the winding module comprises a wiring board and a secondary winding. The wiring board is provided with a primary side and a secondary side which are opposite, the secondary winding comprises a first winding, the first winding comprises a first half-turn winding and a second half-turn winding which are connected in parallel, and the two opposite ends of the first half-turn winding and the second half-turn winding are connected with the primary side and the secondary side respectively. The first half-turn winding at least partially penetrates through the wiring channel between the magnetic core middle column and the first magnetic core side column, and the second half-turn winding at least partially penetrates through the wiring channel between the magnetic core middle column and the second magnetic core side column. According to the embodiment, the half-turn winding in one winding is divided into the two half-turn winding wires, and the half-turn winding wires respectively pass along the two magnetic core side columns, so that magnetic flux balance can be realized.

Description

Technical Field

[0001] The present invention relates to the field of planar transformers, and in particular to a planar transformer, a circuit board and a power supply device. Background Art

[0002] Planar transformers have the characteristics of high efficiency and energy saving, low radiation, low noise, high temperature resistance, moisture retention and moisture resistance. Compared with traditional transformers, planar transformers consume less power and energy, which can not only effectively reduce electricity costs, but also reduce environmental pollution, thereby achieving the purpose of energy saving and environmental protection.

[0003] At present, in some output applications, planar transformers usually include multiple secondary windings to meet the needs of multi-channel voltage output. The voltages output by different secondary windings are generally different. One output voltage is usually an integer multiple or fractional multiple of another output voltage. For example, if the first output voltage is 18V and the second output voltage is 12V, then the first output voltage is 1.5 times the second output voltage. For the case of fractional multiples, when designing the number of winding turns, the traditional method is generally to ensure that the winding corresponding to the lower output voltage is an integer number of turns. As mentioned above, the winding corresponding to 18V is 3 turns, and the winding corresponding to 12V is 2 turns. However, this method increases the amount of copper used due to the large number of winding turns used, thereby increasing copper wire losses. Although there is a method of winding an extra half turn on one side of the core to reduce the number of winding turns, since the core is symmetrical, winding a half turn on one side of the symmetrical core will result in more winding turns on one side of the symmetrical core and fewer winding turns on the other side. Therefore, the core will have a flux imbalance problem due to inconsistent winding turns, which can easily lead to core saturation, making the planar transformer unable to work properly. Summary of the invention

[0004] An object of the present invention is to provide a planar transformer, a circuit board and a power supply device to solve the technical problems of traditional planar transformers having excessive copper usage or unbalanced magnetic flux.

[0005] In a first aspect, an embodiment of the present invention provides a planar transformer, comprising:

[0006] A magnetic core module, wherein the magnetic core module comprises a first magnetic core side column, a second magnetic core side column and a magnetic core middle column, wherein the first magnetic core side column and the second magnetic core side column are arranged with a relative interval, and the magnetic core middle column is arranged between the first magnetic core side column and the second magnetic core side column;

[0007] A winding module is sleeved on the core center column, the winding module includes a wiring board and a secondary winding, the wiring board has a relative primary side and a secondary side, the secondary winding includes a first winding, the first winding includes a first half-turn winding and a second half-turn winding in parallel, the opposite ends of the first half-turn winding are respectively connected to the primary side and the secondary side, and the first half-turn winding is at least partially passed through the routing channel between the core center column and the first core side column, the opposite ends of the second half-turn winding are respectively connected to the primary side and the secondary side, and the second half-turn winding is at least partially passed through the routing channel between the core center column and the second core side column.

[0008] Optionally, the secondary winding also includes a second winding connected in series with the first winding, and the second winding includes a third half-turn winding and a fourth half-turn winding in parallel, the opposite ends of the third half-turn winding are respectively connected to the primary side and the secondary side, and the third half-turn winding is at least partially arranged in the routing channel between the magnetic core center column and the first magnetic core side column, and the opposite ends of the fourth half-turn winding are respectively connected to the primary side and the secondary side, and the fourth half-turn winding is at least partially arranged in the routing channel between the magnetic core center column and the second magnetic core side column.

[0009] Optionally, the wiring board includes at least one wiring layer, and the first winding and the second winding are arranged in the same wiring layer; or,

[0010] The first winding and the second winding are arranged in different wiring layers.

[0011] Optionally, the wiring board is provided with a first wiring module on the primary side, and the wiring board is provided with a second wiring module on the secondary side, one end of the first half-turn winding, one end of the second half-turn winding, one end of the third half-turn winding and one end of the fourth half-turn winding are electrically connected to the first wiring module, and the other end of the first half-turn winding, the other end of the second half-turn winding, the other end of the third half-turn winding and the other end of the fourth half-turn winding are electrically connected to the second wiring module.

[0012] Optionally, the first wiring module includes a first output terminal and a first tap terminal, the second wiring module includes a second output terminal and a second tap terminal, the first output terminal is electrically connected to the second output terminal, the first tap terminal is electrically connected to the second tap terminal, one end of the first half-turn winding is electrically connected to the first tap terminal, the other end of the first half-turn winding is electrically connected to the second output terminal, one end of the second half-turn winding is electrically connected to the first output terminal, and the other end of the second half-turn winding is electrically connected to the second tap terminal.

[0013] Optionally, the first wiring module also includes a third output terminal, and the second wiring module also includes a fourth output terminal, the third output terminal is electrically connected to the fourth output terminal, one end of the third half-turn winding is electrically connected to the third output terminal, the other end of the third half-turn winding is electrically connected to the second tap terminal, one end of the fourth half-turn winding is electrically connected to the first tap terminal, and the other end of the fourth half-turn winding is electrically connected to the fourth output terminal.

[0014] Optionally, the first half-turn winding and the second half-turn winding are symmetrical about the center of the central column of the magnetic core.

[0015] Optionally, the third half-turn winding and the fourth half-turn winding are symmetrical about the center of the central column of the magnetic core.

[0016] In a second aspect, an embodiment of the present invention provides a circuit board, comprising the planar transformer as described above.

[0017] In a third aspect, an embodiment of the present invention provides a power supply device, comprising the circuit board as described above.

[0018] Compared with the prior art, an embodiment of the present invention provides a planar transformer, a circuit board and a power supply device. The planar transformer includes a core module and a winding module. The core module includes a first core side column, a second core side column and a core center column. The first core side column and the second core side column are arranged relatively spaced apart. The core center column is arranged between the first core side column and the second core side column. The winding module is sleeved on the core center column. The winding module includes a wiring board and a secondary winding. The wiring board has a relative primary side and a secondary side. The secondary winding includes a first winding. The first winding includes a first half-turn winding and a second half-turn winding connected in parallel. The opposite ends of the first half-turn winding are respectively connected to the primary side and the secondary side, and the first half-turn winding is at least partially passed through the routing channel between the core center column and the first core side column. The opposite ends of the second half-turn winding are respectively connected to the primary side and the secondary side, and the second half-turn winding is at least partially passed through the routing channel between the core center column and the second core side column. On the one hand, this embodiment can realize the winding of half-turn windings, thereby reducing the number of winding turns and the amount of copper used, and further reducing the copper wire loss. On the other hand, this embodiment splits a half-turn winding into two half-turn windings, and then the two half-turn windings are respectively routed along the two magnetic core side columns. The number of winding turns on both sides of the symmetrical magnetic core is consistent. Since the two half-turn windings are simultaneously fed with current at any time, the magnetic flux generated on the two magnetic core side columns is the same, thereby achieving magnetic flux balance. In addition, by splitting a half-turn winding into two parallel half-turn windings, the heat generation can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0020] Figure 1 A schematic diagram of the structure of a circuit board provided by an embodiment of the present invention;

[0021] Figure 2 An exploded diagram of a planar transformer provided by one embodiment of the present invention;

[0022] Figure 3 An exploded diagram of a planar transformer provided by another embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of a winding module provided for one embodiment of the present invention;

[0024] Figure 5 A cross-sectional view of a winding module provided in accordance with another embodiment of the present invention;

[0025] Figure 6 A schematic diagram of wiring of a first winding provided in an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of the wiring of a second winding provided in an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of external wiring of a magnetic core provided in an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 1000, circuit board; 100, planar transformer; np, primary winding; 22, secondary winding; 221, first winding; 222, second winding; VDC, DC power supply; Q1, first switch tube; Q2, second switch tube; Lr, resonant inductor; Lm, resonant capacitor; D1, first diode; D2, second diode; Co, output capacitor; 10, magnetic core module; 20, winding module; 11, first magnetic core; 12, second magnetic core; 121, body; 122, magnetic core center column; 123, first magnetic core side column; 124, second magnetic core side column; 121a, surface ; 21, wiring board; 21e, mounting hole; D1, first direction; D2, second direction; 21a, first side; 21b, second side; 21c, primary side; 21d, secondary side; 2211, first half-turn winding; 2212, second half-turn winding; 2221, third half-turn winding; 2222, fourth half-turn winding; 213, first wiring module; 214, second wiring module; A1, first output terminal; B1, first tap terminal; C1, third output terminal; A2, second output terminal; B2, second tap terminal; C2, fourth output terminal. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, all within the scope of protection of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device or the flow chart. Furthermore, the words "first", "second", "third", etc. used in the present invention do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0032] One embodiment of the present invention provides a power supply device, which is a device used to supply power to a power-consuming module, including but not limited to a photovoltaic inverter, an energy storage transformer, a UPS (Uninterruptible Power Supply), etc. The power-consuming module may be a load, a battery, an electronic device, etc. The power supply device includes a circuit board, which is a plate-like structure that uses a printing process to make the electrical connection lines and mechanical support patterns required by circuit elements (such as resistors, capacitors, inductors, chips, etc.) on an insulating wiring board, and can provide electrical connections and physical support for electronic components, so that the electronic components are connected to each other according to predetermined circuit design requirements to achieve specific electronic functions.

[0033] In one embodiment, see Figure 1 The circuit board 1000 includes a planar transformer 100, a substrate (not shown) and peripheral circuits.

[0034] The planar transformer 100 is disposed on a substrate. The planar transformer 100 can be configured to implement any function, including but not limited to voltage conversion, current conversion, impedance conversion, isolation, etc.

[0035] In one embodiment, the planar transformer 100 includes a primary winding np and a secondary winding 22. The primary winding np is used to couple energy to the secondary winding 22 so that the secondary winding 22 generates alternating current.

[0036] In one embodiment, the secondary winding 22 includes a first winding 221 and a second winding 222 connected in series.

[0037] In one embodiment, the first winding 221 and / or the second winding 222 includes at least one half-turn winding.

[0038] For example, the first winding 221 includes a half-turn winding, and the second winding 222 does not include a half-turn winding, or the first winding 221 includes two half-turn windings, and the second winding 222 includes one half-turn winding, or the first winding 221 does not include a half-turn winding, and the second winding 222 includes two half-turn windings, or both the first winding 221 and the second winding 222 include two half-turn windings.

[0039] Half-turn winding refers to the situation in which some windings in the winding structure are only wound around half a circle or equivalent to half a coil. It is worth noting that the half-turn winding does not exist in isolation, but cooperates with other full-turn or half-turn windings to form a complete winding system of the planar transformer.

[0040] It is understandable that, for the first winding 221 or the second winding 222, if N half-turn windings are connected in series, the number of coil turns obtained after the series connection is N*0.5. For example, when the number of coil turns of the first winding 221 is designed to be 1 turn, the first winding 221 can be split into two half-turn windings, and then the two half-turn windings obtained by splitting are connected in series.

[0041] It can also be understood that for the first winding 221 or the second winding 222, if it can be split into multiple half-turn windings, it can be completely split or partially split. For example, when the number of coil turns of the first winding 221 is designed to be 1.5 turns, the first winding 221 can be split into a half-turn winding and a one-turn winding, and then the split half-turn winding and one-turn winding are connected in series.

[0042] In one embodiment, the number of coil turns of the first winding 221 and / or the second winding 222 is an integer multiple of half a turn. For example, the number of coil turns of the first winding 221 is half a turn, 1 turn, 1.5 turns, 2 turns, etc. It can be understood that when the number of coil turns of the first winding 221 is half a turn, the first winding 221 can include a half-turn winding, and when the number of coil turns of the first winding 221 is more than half a turn, the first winding 221 can include one or more half-turn windings. As mentioned above, when the number of coil turns of the first winding 221 is 1.5 turns, the first winding 221 can be composed of a half-turn winding and a 1-turn winding, or can be composed of three half-turn windings. The second winding 222 is similar to the first winding 221, and will not be repeated here.

[0043] In one embodiment, the number of coil turns of the first winding 221 may be equal to or different from the number of coil turns of the second winding 222. For example, the number of coil turns of the first winding 221 and the number of coil turns of the second winding 222 are both half turns. For another example, the number of coil turns of the first winding 221 is half a turn, and the number of coil turns of the second winding 222 is 1 turn. For another example, the number of coil turns of the first winding 221 is 1.5 turns, and the number of coil turns of the second winding 222 is 1 turn.

[0044] The substrate is a basic material for manufacturing the circuit board 1000, and generally refers to a copper-clad laminate. The substrate can be any type of substrate, including but not limited to a paper substrate, a glass fiber cloth substrate, a composite substrate, a laminated multilayer substrate, a special material substrate, and the like.

[0045] The peripheral circuit is arranged on the substrate, and is used to cooperate with the planar transformer 100 to convert electrical energy into other forms of energy or provide direct current or alternating current to the power-consuming module.

[0046] In some embodiments, Figure 1As shown, the peripheral circuit includes a DC power supply VDC, a controller, a first switch tube Q1, a second switch tube Q2, a resonant inductor Lr, an excitation inductor Lm, a resonant capacitor Cr, a first diode D1, a second diode D2 and an output capacitor Co.

[0047] In one embodiment, the positive electrode of the DC power supply VDC is electrically connected to the drain of the first switch tube Q1, the source of the first switch tube Q1 is electrically connected to the drain of the second switch tube Q2 and one end of the resonant inductor Lr, the gate of the first switch tube Q1 and the gate of the second switch tube Q2 are electrically connected to the controller, the source of the second switch tube Q2 and one end of the resonant capacitor Cr are electrically connected to the negative electrode of the DC power supply VDC, the other end of the resonant inductor Lr is electrically connected to one end of the excitation inductor Lm and the same end of the primary winding np, and the excitation inductor Lm is electrically connected to the same end of the primary winding np. The other end of is respectively electrically connected to the opposite-name end of the primary winding np and the other end of the resonant capacitor Cr, the opposite-name end of the first winding 221 is electrically connected to the anode of the first diode D1, the cathode of the first diode D1 is respectively electrically connected to one end of the output capacitor Co, the cathode of the second diode D2 and one end of the load Ro, the other end of the output capacitor Co is respectively electrically connected to the same-name end of the first winding 221, the opposite-name end of the second winding 222 and the other end of the load Ro, the same-name end of the second winding 222 is electrically connected to the anode of the second diode D2.

[0048] It can be understood that the connection point between the same-name end of the first winding 221 and the opposite-name end of the second winding 222 is the center tap, which is a section of wire pulled out from the center of the secondary winding 22. The tap voltage is centered relative to the tap voltages on the other two sides and the voltage is zero. Therefore, the planar transformer 100 can be called a center tap transformer. In a full-wave rectifier circuit, the center tap transformer converts AC power into DC power through two diodes and a resistive load.

[0049] The working principle of the circuit board 1000 is: the controller controls the first switch tube Q1 and the second switch tube Q2 to be turned on alternately, so that the first switch tube Q1 and the second switch tube Q2 convert the voltage of the DC power supply VDC into a high-frequency square wave, and then the high-frequency square wave enters the resonant cavity composed of the resonant inductor Lr, the excitation inductor Lm and the resonant capacitor Cr. The resonant cavity eliminates the harmonics of the high-frequency square wave and outputs a fundamental frequency sine wave. The sine wave couples energy to the secondary winding 22 through the primary winding np, so that the secondary winding 22 generates alternating current. The first diode D1 and the second diode D2 rectify the alternating current and output a stable DC voltage.

[0050] Please also read Figure 2 and Figure 3 , one embodiment of the present invention provides a planar transformer, such as Figure 2 or Figure 3 As shown, the planar transformer 100 includes a magnetic core module 10 and a winding module 20 .

[0051] The magnetic core module 10 includes a first magnetic core 11 and a second magnetic core 12 that are arranged opposite to each other, and the first magnetic core 11 covers the second magnetic core 12. The first magnetic core 11 or the second magnetic core 12 is mainly made of a magnetic core material, wherein the magnetic core material may include ferrite, silicon steel sheet, etc., and the type of ferrite may be nickel-zinc ferrite, manganese-zinc oxide, and nickel-zinc oxide. Those skilled in the art may select a suitable magnetic core material according to actual needs.

[0052] The magnetic core shape of the first magnetic core 11 or the second magnetic core 12 can be any shape such as E-type, I-type, etc. Those skilled in the art can select a suitable magnetic core shape according to actual needs.

[0053] In one embodiment, the second magnetic core 12 includes a main body portion 121, a core center column 122, a first core side column 123 and a second core side column 124. The main body portion 121 is in the shape of a straight plate. The core center column 122 is arranged between the first core side column 123 and the second core side column 124. The core center column 122 can protrude from the middle of the surface 121a of the main body portion 121 facing the first magnetic core 11. The core center column 122 can be integrally formed with the main body portion 121, wherein the cross-sectional shape of the core center column 122 can be any shape such as circular, square, etc.

[0054] The first magnetic core side column 123 and the second magnetic core side column 124 are arranged at intervals relative to each other. The first magnetic core side column 123 can protrude from one side of the surface 121a, and the second magnetic core side column 124 can protrude from the other two sides of the surface 121a opposite to the one side. In one embodiment, the height of the first magnetic core side column 123 is the same as the height of the second magnetic core side column 124, and is slightly higher than the height of the magnetic core center column 122. When the first magnetic core 11 and the second magnetic core 12 are covered, the first magnetic core side column 123 and the second magnetic core side column 124 can abut against the first magnetic core 11, and a certain space is left between the magnetic core center column 122 and the first magnetic core 11, which is the air gap. The role of the air gap is to reduce the magnetic permeability, so that the linear characteristics are less dependent on the initial magnetic permeability of the magnetic core material. The air gap can also avoid the magnetic saturation phenomenon under large AC signals or DC bias, and better control the inductance.

[0055] The winding module 20 is at least partially located between the body portion 121 and the first magnetic core 11. The winding module 20 is provided with a mounting through hole 21e corresponding to the magnetic core center column 122. The magnetic core center column 122 can pass through the mounting through hole 21e. The winding module 20 is sleeved on the magnetic core center column 122 through the mounting through hole 21e. In one embodiment, the winding module 20 includes a wiring board 21, a primary winding np, and a secondary winding 22.

[0056] The wiring board 21 is a basic material for laying out the primary winding np and the secondary winding 22. Generally, the wiring board 21 is a copper-clad laminate. In the process of manufacturing the winding module 20, the primary winding np and the secondary winding 22 are laid out on the wiring board 21 by selectively performing opening, chemical copper plating, electrolytic copper plating, etching and other processes on the wiring board 21, thereby obtaining the winding module 20.

[0057] In one embodiment, the wiring board 21 includes at least one wiring layer, and the wiring layer is used for routing the primary winding np or the secondary winding 22 .

[0058] In one embodiment, the wiring board 21 is sleeved on the magnetic core center column 122 through the mounting through hole 21e and is located between the first magnetic core side column 123 and the second magnetic core side column 124. Figure 2 As shown, the wiring board 21 has a primary side 21c and a secondary side 21d opposite to each other along a first direction D1 relative to the mounting through hole 21e, and has a first side 21a and a second side 21b opposite to each other along a second direction D2, and the first direction D1 is perpendicular to the second direction D2. It can be understood that both the first side 21a and the second side 21b have routing channels for winding routing, and the windings arranged on each wiring layer can be routed in the routing channels.

[0059] In one embodiment, Figure 2 As shown, the first side 21a is located on the left side of the mounting hole 21e, the second side 21b is located on the right side of the mounting hole 21e, the primary side 21c is located on the lower side of the mounting hole 21e, and the secondary side 21d is located on the upper side of the mounting hole 21e.

[0060] Optionally, the primary side 21c is an input side of a voltage, and the secondary side 21d is an output side of a voltage.

[0061] In one embodiment, the first side 21 a is disposed corresponding to the first magnetic core side column 123 , and the second side 21 b is disposed corresponding to the second magnetic core side column 124 .

[0062] Optionally, the first side 21 a is disposed close to the first magnetic core side column 123 , or the first side 21 a is disposed adjacent to the first magnetic core side column 123 .

[0063] Optionally, the second side 21 b is disposed close to the second magnetic core side column 124 , or the second side 21 b is disposed adjacent to the second magnetic core side column 124 .

[0064] In one embodiment, when the wiring board 21 is sleeved on the core center column 122 through the mounting through hole 21e, the first side 21a is located between the core center column 122 and the first core side column 123, and the second side 21b is located between the core center column 122 and the second core side column 124.

[0065] In one embodiment, the first winding 221 and the second winding 222 are arranged in the same wiring layer, or the first winding 221 and the second winding 222 are arranged in different wiring layers.

[0066] For example, see Figure 4 The wiring board 21 includes a first wiring layer 211 , and the first winding 221 and the second winding 222 are both arranged in the first wiring layer 211 .

[0067] For another example, see Figure 5 The wiring board includes a first wiring layer and a second wiring layer, the first winding 221 is arranged on the first wiring layer, and the second winding 222 is arranged on the second wiring layer, or the first winding 221 is arranged on the second wiring layer, and the second winding 222 is arranged on the first wiring layer.

[0068] In one embodiment, please refer to Figure 4 and Figure 5 The first winding 221 includes a first half-turn winding 2211 and a second half-turn winding 2212 connected in parallel.

[0069] The first half-turn winding 2211 and the second half-turn winding 2212 are both windings that only wind half a circle or are equivalent to half a coil. The first half-turn winding 2211 and the second half-turn winding 2212 can form a half-turn winding when connected in parallel. For the description of the half-turn winding, please refer to the above description and will not be repeated here.

[0070] Optionally, opposite ends of the first half-turn winding 2211 are respectively connected to the primary side 21c and the secondary side 21d, and the first half-turn winding 2211 is at least partially arranged in the routing channel between the core center column 122 and the first core side column 123. In one embodiment, the first half-turn winding 2211 is at least partially arranged on the first side 21a.

[0071] In one embodiment, the first half-turn winding 2211 runs half a turn from the primary side 21 c along the routing channel of the first side 21 a to the secondary side 21 d.

[0072] Optionally, the opposite ends of the second half-turn winding 2212 are respectively connected to the primary side 21c and the secondary side 21d, and the second half-turn winding 2212 is at least partially arranged in the routing channel between the core center column 122 and the second core side column 124. In one embodiment, the second half-turn winding 2212 is at least partially arranged on the second side 21b.

[0073] In one embodiment, the second half-turn winding 2212 runs half a turn from the primary side 21c along the routing channel of the second side 21b to the secondary side 21d.

[0074] Therefore, on the one hand, this embodiment can realize the winding of a half-turn winding of the first winding 221, thereby reducing the number of winding turns and the amount of copper used, and further reducing the copper wire loss. On the other hand, this embodiment splits a half-turn winding of the first winding 221 into two half-turn windings, and then the two half-turn windings are respectively routed along the two magnetic core side columns, so that the number of winding turns on both sides of the symmetrical magnetic core is consistent. Since the two half-turn windings are simultaneously fed with current at any time, the magnetic flux generated on the two magnetic core side columns is the same, so that the magnetic flux balance can be achieved. In addition, by splitting a half-turn winding into two parallel half-turn windings, the heat generation can be effectively reduced.

[0075] In one embodiment, Figure 4 or Figure 5 As shown, the second winding 222 includes a third half-turn winding 2221 and a fourth half-turn winding 2222 connected in parallel.

[0076] The third half-turn winding 2221 and the fourth half-turn winding 2222 are both windings that only wind half a circle or are equivalent to half a coil. The third half-turn winding 2221 and the fourth half-turn winding 2222 can form a half-turn winding when connected in parallel. For the description of the half-turn winding, please refer to the above description and will not be repeated here.

[0077] Optionally, opposite ends of the third half-turn winding 2221 are respectively connected to the primary side 21c and the secondary side 21d, and the third half-turn winding 2221 is at least partially arranged in the routing channel between the core center column 122 and the first core side column 123. In one embodiment, the third half-turn winding 2221 is at least partially arranged on the first side 21a.

[0078] In one embodiment, the third half-turn winding 2221 runs half a turn from the primary side 21 c along the routing channel of the first side 21 a to the secondary side 21 d.

[0079] Optionally, opposite ends of the fourth half-turn winding 2222 are respectively connected to the primary side 21c and the secondary side 21d, and the fourth half-turn winding 2222 is at least partially arranged in the routing channel between the core center column 122 and the second core side column 124. In one embodiment, the fourth half-turn winding 2222 is at least partially arranged on the second side 21b.

[0080] In one embodiment, the fourth half-turn winding 2222 runs half a turn from the primary side 21c along the routing channel of the second side 21b to the secondary side 21d.

[0081] Therefore, on the one hand, this embodiment can realize the winding of a half-turn winding of the second winding 222, thereby reducing the number of winding turns and the amount of copper used, and further reducing the copper wire loss. On the other hand, this embodiment splits a half-turn winding of the second winding 222 into two half-turn windings, and then the two half-turn windings are respectively routed along the two magnetic core side columns, so that the number of winding turns on both sides of the symmetrical magnetic core is consistent. Since the two half-turn windings are simultaneously fed with current at any time, the magnetic flux generated on the two magnetic core side columns is the same, so that the magnetic flux balance can be achieved. In addition, by splitting a half-turn winding into two parallel half-turn windings, the heat generation can be effectively reduced.

[0082] In one embodiment, please refer to Figure 6 and Figure 7 The wiring board 21 has a first wiring module 213 on the primary side 21c. The first wiring module 213 includes a first output terminal A1, a first tap terminal B1 and a third output terminal C1. The first output terminal A1 and the third output terminal C1 are electrically connected to the voltage output terminal of the secondary winding 22.

[0083] Please combine Figure 1 In one embodiment, the first output terminal A1 is electrically connected to the opposite-name terminal of the first winding 221 and the anode of the first diode D1, the third output terminal C1 is electrically connected to the same-name terminal of the second winding 222 and the anode of the second diode D2, and the first tap terminal B1 is electrically connected to the center tap of the secondary winding 22. Figure 1 The first tap terminal B1 is electrically connected to the same-name end of the first winding 221 and the opposite-name end of the second winding 222 respectively.

[0084] It can be understood that the first output terminal A1 , the first tap terminal B1 , and the third output terminal C1 are connection terminals that can pass through the entire wiring board 21 or a portion of the wiring layer of the wiring board 21 .

[0085] In one embodiment, Figure 6 or Figure 7 As shown, the wiring board 21 is provided with a second wiring module 214 on the secondary side 21d, and the second wiring module 214 includes a second output terminal A2, a second tap terminal B2 and a fourth output terminal C2. The second output terminal A2 and the fourth output terminal C2 are electrically connected to the voltage output terminal of the secondary winding 22.

[0086] Please combine Figure 1In one embodiment, the second output terminal A2 is electrically connected to the opposite-name terminal of the first winding 221 and the anode of the first diode D1, the fourth output terminal C2 is electrically connected to the same-name terminal of the second winding 222 and the anode of the second diode D2, and the second tap terminal B2 is electrically connected to the center tap of the secondary winding 22. Figure 1 In one embodiment, the second tap terminal B2 is electrically connected to the same-name end of the first winding 221 and the opposite-name end of the second winding 222 respectively.

[0087] It can be understood that the second output terminal A2 , the second tap terminal B2 , and the fourth output terminal C2 are connection terminals that can pass through the entire wiring board 21 or a portion of the wiring layer of the wiring board 21 .

[0088] Therefore, this embodiment opens a first output terminal A1, a first tap terminal B1 and a third output terminal C1 on the primary side 21c of the wiring board 21, and opens a second output terminal A2, a second tap terminal B2 and a fourth output terminal C2 on the secondary side 21d of the wiring board 21. The center tap output line of the secondary winding 22 can be placed on the primary side, which is suitable for some low-voltage and high-current occasions and is convenient for routing on the wiring board 21.

[0089] In one embodiment, the first output terminal A1 is electrically connected to the second output terminal A2 through a wiring, the first tap terminal B1 is electrically connected to the second tap terminal B2 through a wiring, and the third output terminal C1 is electrically connected to the fourth output terminal C2 through a wiring. It is understood that these wirings can be completed on the wiring board 21. In another embodiment, please refer to Figure 8 These routings can also be completed outside the magnetic core module 10.

[0090] In one embodiment, please refer again to Figure 6 and Figure 7 The first end of the first half-turn winding 2211, the first end of the second half-turn winding 2212, the first end of the third half-turn winding 2221 and the first end of the fourth half-turn winding 2222 are electrically connected to the first wiring module 213, and the second end of the first half-turn winding 2211, the second end of the second half-turn winding 2212, the second end of the third half-turn winding 2221 and the second end of the fourth half-turn winding 2222 are electrically connected to the second wiring module 214.

[0091] In one embodiment, Figure 6As shown, the first end of the first half-turn winding 2211 is electrically connected to the first tap terminal B1, the second end of the first half-turn winding 2211 is electrically connected to the second output terminal A2, and the first half-turn winding 2211 runs half a turn from the first tap terminal B1 on the primary side 21c along the routing channel between the core middle column 122 and the first core side column 123 to the second output terminal A2 on the secondary side 21d.

[0092] The first end of the second half-turn winding 2212 is electrically connected to the first output terminal A1, and the second end of the second half-turn winding 2212 is electrically connected to the second tap terminal B2. The second half-turn winding 2212 runs half a turn from the first output terminal A1 on the primary side 21c along the routing channel between the magnetic core middle column 122 and the second magnetic core side column 124 to the second tap terminal B2 on the secondary side 21d.

[0093] As mentioned above, since the first end of the first half-turn winding 2211, the first tap terminal B1, the second tap terminal B2 and the second end of the second half-turn winding 2212 are connected together, the second end of the first half-turn winding 2211, the second output terminal A2, the first output terminal A1 and the first end of the second half-turn winding 2212 are connected together, the first half-turn winding 2211 and the second half-turn winding 2212 are in parallel.

[0094] Therefore, this embodiment can not only place the center tap line of the secondary winding 22 on the primary side, but also facilitates the parallel connection of the first half-turn winding 2211 and the second half-turn winding 2212, thereby facilitating the formation of a half-turn winding of the first winding 221.

[0095] In some embodiments, Figure 6 As shown, the first half-turn winding 2211 and the second half-turn winding 2212 are symmetrical about the center of the magnetic core center column 122 .

[0096] Since the first half-turn winding 2211 and the second half-turn winding 2212 are symmetrical about the center of the core center column 122, it is possible to ensure that the impedance of the first half-turn winding 2211 is equal to the impedance of the second half-turn winding 2212, thereby improving the consistency of the magnetic flux generated on the two core side columns.

[0097] In some embodiments, Figure 7 As shown, the first end of the third half-turn winding 2221 is electrically connected to the third output terminal C1, the second end of the third half-turn winding 2221 is electrically connected to the second tap terminal B2, and the third half-turn winding 2221 runs half a turn from the third output terminal C1 on the primary side 21c along the routing channel between the core middle column 122 and the first core side column 123 to the second tap terminal B2 on the secondary side 21d.

[0098] The first end of the fourth half-turn winding 2222 is electrically connected to the first tap terminal B1, and the second end of the fourth half-turn winding 2222 is electrically connected to the fourth output terminal C2. The fourth half-turn winding 2222 runs half a turn from the first tap terminal B1 on the primary side 21c along the routing channel between the magnetic core middle column 122 and the second magnetic core side column 124 to the fourth output terminal C2 on the secondary side 21d.

[0099] As mentioned above, since the first end of the third half-turn winding 2221, the third output terminal C1, the fourth output terminal C2 and the second end of the fourth half-turn winding 2222 are connected together, the second end of the third half-turn winding 2221, the first tap terminal B1, the second tap terminal B2 and the first end of the fourth half-turn winding 2222 are connected together, the third half-turn winding 2221 and the fourth half-turn winding 2222 are in parallel.

[0100] Therefore, this embodiment can not only place the center tap line of the secondary winding 22 on the primary side, but also facilitate the parallel connection of the third half-turn winding 2221 and the fourth half-turn winding 2222, thereby facilitating the formation of a half-turn winding of the second winding 222.

[0101] In some embodiments, Figure 7 As shown, the third half-turn winding 2221 and the fourth half-turn winding 2222 are symmetrical about the center of the magnetic core middle column 122 .

[0102] Since the third half-turn winding 2221 and the fourth half-turn winding 2222 are symmetrical about the center of the magnetic core middle column 122, it is possible to ensure equal impedance and improve the consistency of the magnetic flux generated on the two magnetic core side columns.

[0103] It can be understood that, as mentioned above, the secondary winding 22 is obtained by connecting the first winding 221 and the second winding 222 in series, and the number of turns of the secondary winding 22 is the sum of the number of turns of the first winding 221 and the second winding 222. For example, when the number of turns of the first winding 221 is half a turn and the number of turns of the second winding 222 is 1 turn, the number of turns of the secondary winding 22 is 1.5 turns. In this case, the first winding 221 can be composed of a half-turn winding and the second winding 222 can be composed of a half-turn winding. 22 can be composed of two half-turn windings connected in series. In one embodiment of the present invention, each half-turn winding can be divided into two half-turn windings, and then the two half-turn windings are respectively arranged along the two core side columns for half turns. Regardless of whether the number of turns of the secondary winding 22 is an integer turn or a fractional turn, and regardless of whether the number of turns of the first winding 221 is equal to the number of turns of the second winding 222, it can ensure that the magnetic flux generated on the two core side columns is the same, thereby achieving magnetic flux balance.

[0104] Finally, it should be noted that the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present invention. The purpose of providing these implementations is to make the understanding of the disclosure of the present invention more thorough and comprehensive. And under the idea of ​​the present invention, the above-mentioned technical features continue to be combined with each other, and there are many other changes in different aspects of the present invention as described above, which are all considered to be within the scope of the present invention. Further, for those of ordinary skill in the art, improvements or changes can be made according to the above description, and all these improvements and changes should belong to the scope of protection of the claims attached to the present invention.

Claims

1. A planar transformer, characterized in that: include: A magnetic core module, wherein the magnetic core module comprises a first magnetic core side column, a second magnetic core side column and a magnetic core middle column, wherein the first magnetic core side column and the second magnetic core side column are arranged with a relative interval, and the magnetic core middle column is arranged between the first magnetic core side column and the second magnetic core side column; A winding module is sleeved on the core center column, the winding module includes a wiring board and a secondary winding, the wiring board has a relative primary side and a secondary side, the secondary winding includes a first winding, the first winding includes a first half-turn winding and a second half-turn winding in parallel, the opposite ends of the first half-turn winding are respectively connected to the primary side and the secondary side, and the first half-turn winding is at least partially passed through the routing channel between the core center column and the first core side column, the opposite ends of the second half-turn winding are respectively connected to the primary side and the secondary side, and the second half-turn winding is at least partially passed through the routing channel between the core center column and the second core side column.

2. The planar transformer according to claim 1, characterized in that: The secondary winding also includes a second winding connected in series with the first winding, and the second winding includes a third half-turn winding and a fourth half-turn winding connected in parallel, the opposite ends of the third half-turn winding are respectively connected to the primary side and the secondary side, and the third half-turn winding is at least partially arranged in the routing channel between the magnetic core center column and the first magnetic core side column, the opposite ends of the fourth half-turn winding are respectively connected to the primary side and the secondary side, and the fourth half-turn winding is at least partially arranged in the routing channel between the magnetic core center column and the second magnetic core side column.

3. The planar transformer according to claim 2, characterized in that: The wiring board includes at least one wiring layer, and the first winding and the second winding are arranged in the same wiring layer; or, The first winding and the second winding are arranged in different wiring layers.

4. The planar transformer according to claim 2 or 3, characterized in that: The wiring board is provided with a first wiring module on the primary side, and a second wiring module on the secondary side. One end of the first half-turn winding, one end of the second half-turn winding, one end of the third half-turn winding, and one end of the fourth half-turn winding are electrically connected to the first wiring module, and the other end of the first half-turn winding, the other end of the second half-turn winding, the other end of the third half-turn winding, and the other end of the fourth half-turn winding are electrically connected to the second wiring module.

5. The planar transformer according to claim 4, characterized in that: The first wiring module includes a first output terminal and a first tap terminal, the second wiring module includes a second output terminal and a second tap terminal, the first output terminal is electrically connected to the second output terminal, the first tap terminal is electrically connected to the second tap terminal, one end of the first half-turn winding is electrically connected to the first tap terminal, the other end of the first half-turn winding is electrically connected to the second output terminal, one end of the second half-turn winding is electrically connected to the first output terminal, and the other end of the second half-turn winding is electrically connected to the second tap terminal.

6. The planar transformer according to claim 5, characterized in that: The first wiring module also includes a third output terminal, and the second wiring module also includes a fourth output terminal, the third output terminal is electrically connected to the fourth output terminal, one end of the third half-turn winding is electrically connected to the third output terminal, the other end of the third half-turn winding is electrically connected to the second tap terminal, one end of the fourth half-turn winding is electrically connected to the first tap terminal, and the other end of the fourth half-turn winding is electrically connected to the fourth output terminal.

7. The planar transformer according to claim 1, characterized in that: The first half-turn winding and the second half-turn winding are symmetrical about the center of the magnetic core center column.

8. The planar transformer according to claim 2 or 3, characterized in that: The third half-turn winding and the fourth half-turn winding are symmetrical about the center of the magnetic core center column.

9. A circuit board, characterized in that: Comprising the planar transformer according to any one of claims 1 to 8.

10. A power supply device, characterized in that: Comprising the circuit board as claimed in claim 9.

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