Power supply device based on modular planar transformer

Abstract

The invention relates to a power supply device based on a modular planar transformer. Comprising a planar transformer for converting a first voltage into a second voltage; the input circuit is used for filtering an input voltage and then transmitting a first voltage to the planar transformer; the output circuit is used for filtering the second voltage and then sending an output voltage; the first voltage is more than ten times of the second voltage; the input circuit, the output circuit and the control circuit are all arranged on a power panel on the same horizontal plane, the power panel is provided with a through hole used for containing the planar transformer, and a first connecting end matched with the first connecting port is arranged on the side, where the input circuit is arranged, of the through hole. And a second connecting end matched with the second connecting port is arranged on one side, where the output circuit is arranged, of the through hole. By achieving modularization of the planar transformer, the power supply device has the advantages of being small in size and high in reliability when applied to high-voltage input and low-voltage large-current output, and cost is saved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of switching power supplies, and in particular to a power supply device based on a modular planar transformer. Background Art

[0002] In recent years, with the development of active phased array radar towards high-power multi-element, the mainstream input voltage has also increased from DC300V to DC700V, and it is required to have the characteristics of modular and fast installation. The general switching power supply uses a transformer with copper wire wound on the magnetic core and fixed by a skeleton. The power density of this transformer is much smaller than that of a planar transformer.

[0003] Regarding the above technical solution, the inventors found that there are at least the following technical problems:

[0004] Compared with traditional skeleton transformers, planar transformers have the characteristics of small height, small copper loss and small magnetic loss. However, when it comes to applications with high voltage input and low voltage and high current output, the number of layers of the planar transformer will be large, which cannot highlight the advantage of the small size of the planar transformer and greatly increases the power supply cost.

[0005] Therefore, it is necessary to improve one or more problems existing in the above-mentioned related technical solutions.

[0006] It should be noted that this section is intended to provide background or context for the technical solutions of the present invention stated in the claims. The description herein is not admitted to be prior art by inclusion in this section. Summary of the invention

[0007] An object of the present invention is to provide a power supply device based on a modular planar transformer, thereby solving one or more problems caused by the limitations and defects of the related art at least to a certain extent.

[0008] The present invention provides a power supply device based on a modular planar transformer, comprising:

[0009] A planar transformer, wherein the planar transformer is provided with a first connection port for receiving a first voltage and a second connection port for sending a second voltage, and converts the first voltage into the second voltage;

[0010] An input circuit, the input circuit is used to receive an input voltage, filter the input voltage and transmit the first voltage to the planar transformer;

[0011] an output circuit, the output circuit being used to receive the second voltage, filter the second voltage and then send an output voltage;

[0012] A control circuit, wherein the control circuit is provided with a control chip, and the filter processing of the input circuit and the output circuit is controlled by the control chip;

[0013] wherein the first voltage is more than ten times the second voltage;

[0014] Wherein, the input circuit, the output circuit and the control circuit are all arranged on a power board on the same horizontal plane, and the power board is provided with a through hole for accommodating the planar transformer, and a first connection end matching the first connection port is provided on the side of the through hole where the input circuit is arranged, and a second connection end matching the second connection port is provided on the side of the through hole where the output circuit is arranged.

[0015] Optionally, the planar transformer includes: a first magnetic core, a second magnetic core, a first insulating sheet, a second insulating sheet and a multi-layer printed circuit board containing winding coils, the multi-layer printed circuit board containing winding coils is arranged between the first magnetic core and the second magnetic core, and is fixedly supported by the second magnetic core, the first insulating sheet is arranged between the first magnetic core and the multi-layer printed circuit board containing winding coils, and the second insulating sheet is arranged between the second magnetic core and the multi-layer printed circuit board containing winding coils.

[0016] Optionally, the multi-layer printed circuit board containing winding coils includes a multi-layer primary layer and a multi-layer secondary layer, the multi-layer primary layer and the multi-layer secondary layer are cross-stacked, the multi-layer primary layer is provided with a first welding hole as a primary tap, the multi-layer secondary layer is provided with a second welding hole as a secondary tap, the first welding hole and the second welding hole are both semicircular holes, the first welding holes of the multi-layer primary layer are aligned along the central axis of the semicircular hole and serve as the first connection port together, and the second welding holes of the multi-layer secondary layer are aligned along the central axis of the semicircular hole and serve as the second connection port together.

[0017] Optionally, the first voltage is a DC voltage greater than 600V, and the second voltage is a DC voltage less than 50V.

[0018] Optionally, the voltage power conversion of the planar transformer is from DC700V to DC28V50A.

[0019] Optionally, the coil turns ratio of the planar transformer is 16:2.

[0020] Optionally, the planar transformer is provided with 12 layers of printed circuit boards containing winding coils, wherein 4 primary layers and 8 secondary layers are provided, and each of the 4 primary layers has 4 turns of winding, and each of the 8 secondary layers has 1 turn of winding.

[0021] Optionally, the first magnetic core and the second magnetic core are EQ38 magnetic cores, and the first insulating sheet and the second insulating sheet are ceramic insulating sheets.

[0022] Optionally, the input circuit is provided with a two-stage filtering circuit and a surge suppression circuit.

[0023] The technical solution provided by the present invention may include the following beneficial effects:

[0024] In the present invention, the planar transformer is arranged in the through hole of the power board, and the planar transformer independent of the power board is connected to the input and output circuit through the connection port and the connection end, so as to realize the modularization of the planar transformer. When the application is for high voltage input and low voltage and high current output, the power supply device not only has the characteristics of small size and high reliability, but also saves costs. When the planar transformer fails, the replacement operation is made easier. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0026] Figure 1 A schematic structural diagram of a power supply device based on a modular planar transformer in an exemplary embodiment of the present invention is shown;

[0027] Figure 2 A circuit diagram showing an input circuit in an exemplary embodiment of the present invention;

[0028] Figure 3 A schematic diagram showing the structure of a planar transformer in an exemplary embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram showing the windings of each layer of a planar transformer in an exemplary embodiment of the present invention;

[0030] Figure 5 A circuit diagram showing a control circuit and an output circuit in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] In addition, the accompanying drawings are only schematic illustrations of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0033] The present invention provides a power supply device based on a modular planar transformer, referring to Figure 1 As shown in , it includes: a planar transformer, an input circuit, an output circuit and a control circuit.

[0034] The planar transformer is provided with a first connection port for receiving a first voltage and a second connection port for sending a second voltage, and converts the first voltage into the second voltage. The input circuit is used to receive an input voltage, filter the input voltage and transmit the first voltage to the planar transformer. The output circuit is used to receive the second voltage, filter the second voltage and send the output voltage. The control circuit is provided with a control chip, and the filtering process of the input circuit and the output circuit is controlled by the control chip.

[0035] The first voltage is more than ten times the second voltage.

[0036] Wherein, the input circuit, the output circuit and the control circuit are all arranged on a power board on the same horizontal plane, and the power board is provided with a through hole for accommodating the planar transformer, and a first connection end matching the first connection port is provided on the side of the through hole where the input circuit is arranged, and a second connection end matching the second connection port is provided on the side of the through hole where the output circuit is arranged.

[0037] It is important to understand that the input circuit is used to receive high voltage and filter it; the modular planar transformer converts the high voltage provided by the input circuit into a low voltage and high current planar transformer; the control and output circuit converts the high voltage into a low voltage and high current through the control chip and the planar transformer, and filters the output. The input and output voltages are installed between boards using connectors and modules outside the device. The planar transformer is effectively separated into modules, which provides a stable and reliable high voltage power supply device.

[0038] It is also necessary to understand that the high voltage power supply device bottom plate can form a high voltage power supply device after the planar transformer is installed, and the device is installed inside the source phased array and forms a combination with the radiation unit. The planar transformer and the power supply board are detachable, making it more convenient to replace the planar transformer.

[0039] It is also important to understand that reference Figure 5 As shown, A1 is the control circuit and A2 is the output circuit. The control circuit uses LLC controller L6599AD to chop the input voltage sent by the input circuit, the transformer reduces the voltage to 28V, and finally the output circuit filters out and reduces the noise in the 28V voltage.

[0040] It is also necessary to understand that, compared with conventional power supply devices, the use of this device can not only reduce the size of the converter (small height of the planar transformer), but also reduce the cost of components (modularization of the planar transformer, adjustable input voltage range and the number of layers of the power supply base can be reduced). Another advantage of this device is the high input and output stability and high power density.

[0041] The power supply device based on modular planar transformer is adopted, by setting the planar transformer in the through hole of the power board, and connecting the planar transformer independent of the power board to the input and output circuit through the connection port and the connection end, so as to realize the modularization of the planar transformer. When it is applied to high voltage input and low voltage and high current output, the power supply device not only has the characteristics of small size and high reliability, but also saves costs. When the planar transformer fails, the replacement operation is made easier.

[0042] Next, we will refer to Figures 1 to 5 The various parts of the above-mentioned modular planar transformer-based power supply device in this exemplary embodiment are described in more detail.

[0043] In some embodiments, reference Figure 3 As shown in, the planar transformer includes: a first magnetic core, a second magnetic core, a first insulating sheet, a second insulating sheet and a multi-layer printed circuit board containing winding coils, the multi-layer printed circuit board containing winding coils is arranged between the first magnetic core and the second magnetic core, and is fixedly supported by the second magnetic core, the first insulating sheet is arranged between the first magnetic core and the multi-layer printed circuit board containing winding coils, and the second insulating sheet is arranged between the second magnetic core and the multi-layer printed circuit board containing winding coils. It should be understood that the multi-layer printed circuit board containing winding coils is referred to as the multi-layer winding printed board, and the planar transformer refers to Figure 3 The planar transformer is installed in a structure including a magnetic core I, an insulating sheet I, a multi-layer winding printed circuit board, an insulating sheet II and a magnetic core II.

[0044] In some embodiments, reference Figure 3 As shown in , the multi-layer printed circuit board containing winding coils includes a multi-layer primary layer and a multi-layer secondary layer, the multi-layer primary layer and the multi-layer secondary layer are cross-stacked, the multi-layer primary layer is provided with a first welding hole as a primary tap, the multi-layer secondary layer is provided with a second welding hole as a secondary tap, the first welding hole and the second welding hole are both semicircular holes, the first welding holes of the multi-layer primary layer are aligned along the central axis of the semicircular hole and serve as the first connection port together, and the second welding holes of the multi-layer secondary layer are aligned along the central axis of the semicircular hole and serve as the second connection port together. It should be understood that the bonded planar transformer is welded to the power board through the semicircular hole. Specifically, the first magnetic core and the second magnetic core are EQ38 magnetic cores, and the first insulating sheet and the second insulating sheet are ceramic insulating sheets. The printed circuit board of the power board is a FR4 glass fiber board with a copper thickness of 2oz.

[0045] In some embodiments, the first voltage is a DC voltage greater than 600 V, and the second voltage is a DC voltage less than 50 V. It should be understood that the input circuit receives a 600V-700V DC high voltage input and transmits the input high voltage to the planar transformer.

[0046] In some embodiments, the voltage power conversion of the planar transformer is from DC700V to DC28V50A. It should be understood that the first voltage is DC700V, the second voltage is DC28V, and the planar transformer sends a current of 50A.

[0047] In some embodiments, the coil turns ratio of the planar transformer is 16: 2. It should be understood that the coil turns ratio of the planar transformer 16: 2 is mainly for voltage power conversion from DC700V to DC28V50A.

[0048] In some embodiments, reference Figure 4 As shown in , the planar transformer is provided with 12 layers of printed circuit boards containing winding coils, wherein 4 primary layers and 8 secondary layers are provided, and each of the 4 primary layers has 4 turns of winding, and each of the 8 secondary layers has 1 turn of winding. It should be understood that the sandwich winding method is used for the primary layers of 1, 6, 7, and 12, and each layer has 4 turns of winding. Considering that the spacing between the primary voltage withstand coils needs to be more than 0.3mm, the through-layer vias are used for copper cutting; the secondary side is the center tap, and the secondary sides are 2-5 and 8-11 layers in parallel. The line width of each layer is 7.5mm, and the current density is not more than 20A / mm 2 .

[0049] In some embodiments, reference Figure 2As shown in , the input circuit is provided with a two-stage filter circuit and a surge suppression circuit. It should be understood that the input circuit includes: two-stage common mode inductors, filter capacitors, transient suppression diodes and Y capacitors. The first-stage filter circuit includes a fuse F200, an inductor LF201 and capacitors C293-C296, the second-stage filter circuit includes LF200 and capacitors C246-C251, C240, C241, C206, C211, and the surge circuit includes Y capacitors CY200-CY207, transient suppression diodes RV205 and RV200 connected in series, and capacitors C200, C203, C212, C207. The input filter circuit can effectively reduce noise and suppress surges, making the voltage sent to the planar transformer more reliable and stable.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in this specification.

[0051] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

Claims

1. A power supply device based on a modular planar transformer, characterized in that: include: A planar transformer, wherein the planar transformer is provided with a first connection port for receiving a first voltage and a second connection port for sending a second voltage, and converts the first voltage into the second voltage; An input circuit, the input circuit is used to receive an input voltage, filter the input voltage and transmit the first voltage to the planar transformer; an output circuit, the output circuit being used to receive the second voltage, filter the second voltage and then send an output voltage; A control circuit, wherein the control circuit is provided with a control chip, and the filter processing of the input circuit and the output circuit is controlled by the control chip; wherein the first voltage is more than ten times the second voltage; Wherein, the input circuit, the output circuit and the control circuit are all arranged on a power board on the same horizontal plane, and the power board is provided with a through hole for accommodating the planar transformer, and a first connection end matching the first connection port is provided on the side of the through hole where the input circuit is arranged, and a second connection end matching the second connection port is provided on the side of the through hole where the output circuit is arranged.

2. The power supply device based on modular planar transformer according to claim 1, characterized in that: The planar transformer includes: a first magnetic core, a second magnetic core, a first insulating sheet, a second insulating sheet and a multi-layer printed circuit board containing winding coils. The multi-layer printed circuit board containing winding coils is arranged between the first magnetic core and the second magnetic core and is fixedly supported by the second magnetic core. The first insulating sheet is arranged between the first magnetic core and the multi-layer printed circuit board containing winding coils, and the second insulating sheet is arranged between the second magnetic core and the multi-layer printed circuit board containing winding coils.

3. The power supply device based on modular planar transformer according to claim 2, characterized in that: The multi-layer printed circuit board containing winding coils includes a multi-layer primary layer and a multi-layer secondary layer, the multi-layer primary layer and the multi-layer secondary layer are cross-stacked, the multi-layer primary layer is provided with a first welding hole as a primary tap, the multi-layer secondary layer is provided with a second welding hole as a secondary tap, the first welding hole and the second welding hole are both semicircular holes, the first welding holes of the multi-layer primary layer are aligned along the central axis of the semicircular hole and serve as the first connection port together, and the second welding holes of the multi-layer secondary layer are aligned along the central axis of the semicircular hole and serve as the second connection port together.

4. The power supply device based on modular planar transformer according to claim 3, characterized in that: The first voltage is a DC voltage greater than 600V, and the second voltage is a DC voltage less than 50V.

5. The power supply device based on modular planar transformer according to claim 4, characterized in that: The planar transformer converts the voltage power from DC700V to DC28V50A.

6. The power supply device based on modular planar transformer according to claim 5, characterized in that: The coil turns ratio of the planar transformer is 16:

2.

7. The power supply device based on modular planar transformer according to claim 6, characterized in that: The planar transformer is provided with 12 layers of printed circuit boards containing winding coils, wherein 4 primary layers and 8 secondary layers are provided, and each of the 4 primary layers has 4 turns of winding, and each of the 8 secondary layers has 1 turn of winding.

8. The power supply device based on modular planar transformer according to any one of claims 1 to 7, characterized in that: The first magnetic core and the second magnetic core are EQ38 magnetic cores, and the first insulating sheet and the second insulating sheet are ceramic insulating sheets.

9. The power supply device based on modular planar transformer according to any one of claims 1 to 7, characterized in that: The input circuit is provided with a two-stage filter circuit and a surge suppression circuit.

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