Display power supply system and display

Abstract

The utility model relates to a display power supply system and a display, and relates to the technical field of power supply control. The display power supply system comprises an upper shell, a lower shell and a circuit substrate assembly. The lower shell and the upper shell are detachably connected to form an inner cavity. The circuit substrate assembly is arranged in the inner cavity and comprises an input circuit, a filtering and rectifying circuit, a control and gallium nitride switch integrated circuit, a transformer and an output rectifying circuit, the input circuit, the filtering and rectifying circuit and the input end of the transformer are sequentially connected, and the control and gallium nitride switch integrated circuit is connected with the input end of the transformer; the output rectification circuit is arranged between the output end of the transformer and the voltage output end of the display power supply. According to the display power supply system, the gallium nitride device is applied to the display power supply system, and the display power supply system has relatively high energy efficiency and smaller size by utilizing the characteristic of small on resistance of the gallium nitride device.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control, and in particular to a display power supply system and a display. Background Art

[0002] In recent years, monitors have increasingly higher requirements for lightweight equipment. Traditional power supplies can no longer meet the needs of monitors due to their large size and weight, complex structure, and low power transmission efficiency. Traditional power supply technology and automation technology are not high, and the components are dense. In addition, the manufacturing process is complex, and the heat generation is serious, there are high safety risks, the service life is reduced, and the power conversion efficiency is low. At present, the cooling method of the power supply system mainly adopts air cooling, which increases the size and weight of the power supply. In addition, its power is increasingly unable to meet the user's usage needs. Summary of the invention

[0003] The present invention aims to solve the problem that the power supply of the display in the related technology has low power efficiency and is too large in size and weight to meet the needs of users.

[0004] In a first aspect, an embodiment of the present application provides a display power supply system, which includes: an upper housing, a lower housing and a circuit substrate assembly; wherein:

[0005] A lower housing, the lower housing is detachably connected to the upper housing to form an internal cavity. A circuit substrate assembly is disposed in the internal cavity, the circuit substrate assembly includes an input circuit, a filter rectifier circuit, a control and gallium nitride switch integrated circuit, a transformer and an output rectifier circuit, the input circuit, the filter rectifier circuit and the transformer input end are connected in sequence, the control and gallium nitride switch integrated circuit is connected to the transformer input end, and the output rectifier circuit is disposed between the transformer output end and the voltage output end of the display power supply.

[0006] In combination with the first aspect, in one implementation, the circuit substrate assembly includes: a PCB board, a front side of which is provided with the control and gallium nitride switch integrated circuit, and a back side of which is provided with a plurality of heat conducting sheets.

[0007] In combination with the first aspect, in one implementation, the control and gallium nitride switch integrated circuit includes: a gallium nitride switch controller, a power switch circuit and an optocoupler drive circuit, the power switch circuit is provided with a gallium nitride controller, the optocoupler drive circuit is provided with a gallium nitride optocoupler device, and the level input pin of the gallium nitride controller is connected to the gallium nitride switch controller through the gallium nitride optocoupler device.

[0008] In combination with the first aspect, in one implementation, the filtering and rectifying circuit includes: an EMI filtering circuit, a rectifying circuit and a filtering circuit connected in sequence, the EMI filtering circuit is connected to the input circuit, and the filtering circuit is connected to the input end of the transformer.

[0009] In combination with the first aspect, in one implementation, it includes: a filter output device connected between the output rectifier circuit and the voltage output terminal.

[0010] In combination with the first aspect, in one implementation, a detection circuit is provided on the circuit substrate assembly, and the detection circuit is connected to an input end of the filter output device.

[0011] In combination with the first aspect, in one implementation, two heat conducting plates are provided on the back side of the PCB board, and the two heat conducting plates correspond to the positions of the gallium nitride switch controller and the gallium nitride controller.

[0012] In combination with the first aspect, in one implementation, a thermally conductive silicone layer is adhered to the surface of the thermally conductive sheet.

[0013] In combination with the first aspect, in one implementation, the upper shell and the lower shell are connected by a sealing adhesive strip.

[0014] In a second aspect, an embodiment of the present application provides a device including: a display power supply as described in any one of the above items.

[0015] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0016] In the utility model, gallium nitride devices are applied to the display power supply system, and the control and gallium nitride switch integrated circuit package devices are used as the main components in the circuit substrate assembly of the display power supply system. By utilizing the small on-resistance of the gallium nitride device, the display power supply system has higher energy efficiency and smaller volume. At the same time, the gallium nitride device has a higher switching frequency, which makes the electrolytic capacitor and magnetic components more compact and can also reduce the overall volume of the display power supply, meeting the lightweight requirements of the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a display power supply system in an embodiment of the present application.

[0019] In the figure: 1. Input circuit; 2. Transformer; 3. Control and GaN switch integrated circuit; 41. EMI filter circuit; 42. Rectifier circuit; 43. Filter circuit; 5. Filter output; 6. Voltage output terminal; 7. Detection circuit; 8. Output rectifier circuit. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In view of the problem in related technologies that the power supply of the display has low energy efficiency and is too large in size and weight to meet user needs.

[0022] In a first aspect, an embodiment of the present application provides a display power supply system, which includes: an upper housing, a lower housing and a circuit substrate assembly; wherein:

[0023] The lower shell is detachably connected to the upper shell to form an internal cavity. A circuit substrate assembly is arranged in the internal cavity, and the circuit substrate assembly includes an input circuit 1, a filter rectifier circuit, a control and gallium nitride switch integrated circuit 3, a transformer 2 and an output rectifier circuit 8. The input circuit 1, the filter rectifier circuit and the input end of the transformer 2 are connected in sequence, the control and gallium nitride switch integrated circuit 3 is connected to the input end of the transformer 2, and the output rectifier circuit 8 is arranged between the output end of the transformer 2 and the voltage output end 6 of the display power supply.

[0024] It is understandable that the main factor limiting the volume of the display in the related art is the heat dissipation capacity. The display power supply system of the present application uses a control and gallium nitride switch integrated circuit 3 packaged device as the main component. Since the gallium nitride (GaN) material used in the display device power switch circuit is a wide bandgap compound semiconductor material, it has the advantages of large bandgap width, high breakdown voltage, high thermal conductivity, high switching frequency, and strong radiation resistance. Gallium nitride material technology is used and applied to the display power supply. Stable safety performance and high conversion efficiency. Small size, high power density, high automation of manufacturing process, low cost and other advantages. The smaller internal resistance of gallium nitride devices greatly reduces the heat generation, so that metal is no longer used as a heat sink. At the same time, due to the increase in switching frequency, magnetic components and capacitor components can use a smaller volume. In addition, the power supply system can withstand higher frequency switching on and off changes when in use, generate lower heat, have higher transmission power, and under the same working parameters, because the volume of the gallium nitride switch tube is smaller than that of other switch tubes, the size of the power adapter can also be reduced.

[0025] Furthermore, the reduction in component size makes it possible to place all components on the same surface during manufacturing, reducing production steps and labor costs. Combined, this can achieve higher efficiency, significantly reduced size and lighter weight than traditional silicon component power supplies.

[0026] In some specific implementations, the control and gallium nitride switch integrated circuit 3 includes: a gallium nitride switch controller, a power switch circuit and an optocoupler drive circuit, the power switch circuit is provided with a gallium nitride controller, the optocoupler drive circuit is provided with a gallium nitride optocoupler device, and the level input pin of the gallium nitride controller is connected to the gallium nitride switch controller through the gallium nitride optocoupler device.

[0027] Furthermore, if Figure 1 As shown, the filtering and rectifying circuit includes: an EMI filtering circuit 41, a rectifying circuit 42 and a filtering circuit 43 connected in sequence, the EMI filtering circuit 43 is connected to the input circuit 1, and the filtering circuit 43 is connected to the input end of the transformer 2.

[0028] Specifically, the display power supply system further includes: a filter output 5 connected between the output rectifier circuit 8 and the voltage output terminal 6 .

[0029] Optionally, a detection circuit 7 is provided on the circuit substrate assembly, and the detection circuit (7) is connected to the input end of the filter output device 5.

[0030] In some preferred embodiments, the circuit substrate assembly includes: a PCB board (circuit board), the front side of which is provided with the control and GaN switch integrated circuit 3, and the back side of which is provided with a plurality of heat conducting sheets.

[0031] It is worth noting that the PCB board adopts a double-sided board manufacturing process, the front side of which is used to set the control and GaN switch integrated circuit 3, and the back side is not provided with circuit components, but with multiple heat conducting sheets used as heat dissipation surfaces. In this way, the internal temperature rise is reduced and the heat dissipation area of ​​the PCB board is increased.

[0032] Specifically, in order to improve the heat dissipation efficiency of the PCB board, two heat conductive sheets are provided on the back of the PCB board, and the positions of the two heat conductive sheets on the back of the PCB board correspond to the positions of the gallium nitride switch controller and the gallium nitride controller on the front of the PCB board. Preferably, a heat conductive silicone layer is adhered to the surface of the heat conductive sheet.

[0033] In some optional embodiments, the upper shell and the lower shell are connected by a sealing adhesive strip, and thermally conductive silicone is applied on the fitting surfaces of the two.

[0034] In a second aspect, the present application provides a display, which includes: a display power supply system, the display power supply system includes: an upper housing, a lower housing and a circuit substrate assembly; wherein,

[0035] The lower shell is detachably connected to the upper shell to form an internal cavity. A circuit substrate assembly is arranged in the internal cavity, and the circuit substrate assembly includes an input circuit 1, a filter rectifier circuit, a control and gallium nitride switch integrated circuit 3, a transformer 2 and an output rectifier circuit 8. The input circuit 1, the filter rectifier circuit and the input end of the transformer 2 are connected in sequence, the control and gallium nitride switch integrated circuit 3 is connected to the input end of the transformer 2, and the output rectifier circuit 8 is arranged between the output end of the transformer 2 and the voltage output end 6 of the display power supply.

[0036] It is understandable that the main factor limiting the volume of the display in the related art is the heat dissipation capacity. The display power supply system of the present application uses a control and gallium nitride switch integrated circuit 3 packaged device as the main component. Since the gallium nitride (GaN) material used in the display device power switch circuit is a wide bandgap compound semiconductor material, it has the advantages of large bandgap width, high breakdown voltage, high thermal conductivity, high switching frequency, and strong radiation resistance. Gallium nitride material technology is used and applied to the display power supply. Stable safety performance and high conversion efficiency. Small size, high power density, high automation of manufacturing process, low cost and other advantages. The smaller internal resistance of gallium nitride devices greatly reduces the heat generation, so that metal is no longer used as a heat sink. At the same time, due to the increase in switching frequency, magnetic components and capacitor components can use a smaller volume. In addition, the power supply system can withstand higher frequency switching on and off changes when in use, generate lower heat, have higher transmission power, and under the same working parameters, because the volume of the gallium nitride switch tube is smaller than that of other switch tubes, the size of the power adapter can also be reduced.

[0037] Furthermore, the reduction in component size makes it possible to place all components on the same surface during manufacturing, reducing production steps and labor costs. Combined, this can achieve higher efficiency, significantly reduced size and lighter weight than traditional silicon component power supplies.

[0038] In some specific implementations, the control and gallium nitride switch integrated circuit 3 includes: a gallium nitride switch controller, a power switch circuit and an optocoupler drive circuit, the power switch circuit is provided with a gallium nitride controller, the optocoupler drive circuit is provided with a gallium nitride optocoupler device, and the level input pin of the gallium nitride controller is connected to the gallium nitride switch controller through the gallium nitride optocoupler device.

[0039] Furthermore, if Figure 1 As shown, the filtering and rectifying circuit includes: an EMI filtering circuit 41, a rectifying circuit 42 and a filtering circuit 43 connected in sequence, the EMI filtering circuit 43 is connected to the input circuit 1, and the filtering circuit 43 is connected to the input end of the transformer 2.

[0040] Specifically, the display power supply system further includes: a filter output 5 connected between the output rectifier circuit 8 and the voltage output terminal 6 .

[0041] Optionally, a detection circuit 7 is provided on the circuit substrate assembly, and the detection circuit (7) is connected to the input end of the filter output device 5.

[0042] In some preferred embodiments, the circuit substrate assembly includes: a PCB board (circuit board), the front side of which is provided with the control and GaN switch integrated circuit 3, and the back side of which is provided with a plurality of heat conducting sheets.

[0043] It is worth noting that the PCB board adopts a double-sided board manufacturing process, the front side of which is used to set the control and GaN switch integrated circuit 3, and the back side is not provided with circuit components, but with multiple heat conducting sheets used as heat dissipation surfaces. In this way, the internal temperature rise is reduced and the heat dissipation area of ​​the PCB board is increased.

[0044] Specifically, in order to improve the heat dissipation efficiency of the PCB board, two heat conductive sheets are provided on the back of the PCB board, and the positions of the two heat conductive sheets on the back of the PCB board correspond to the positions of the gallium nitride switch controller and the gallium nitride controller on the front of the PCB board. Preferably, a heat conductive silicone layer is adhered to the surface of the heat conductive sheet.

[0045] In some optional embodiments, the upper shell and the lower shell are connected by a sealing adhesive strip, and thermally conductive silicone is applied on the contact surface of the two, so that the heat of the heat-generating components in the internal cavity can be efficiently transferred to the external environment.

[0046] In summary, the present invention applies gallium nitride devices to the display power supply system, and adopts the control and gallium nitride switch integrated circuit packaged devices as the main components in the circuit substrate assembly of the display power supply system. By utilizing the small on-resistance of gallium nitride devices, the display power supply system has higher energy efficiency and smaller volume. At the same time, the gallium nitride device has a higher switching frequency, making the electrolytic capacitor and magnetic components more compact, and can also reduce the overall volume of the display power supply, meeting the lightweight requirements of the display.

[0047] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0048] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0049] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A display power supply system, characterized in that: include: Upper shell; a lower shell, the lower shell being detachably connected to the upper shell to form an internal cavity; A circuit substrate assembly is arranged in the internal cavity, the circuit substrate assembly comprising an input circuit (1), a filter rectifier circuit, a control and gallium nitride switch integrated circuit (3), a transformer (2) and an output rectifier circuit (8), the input circuit (1), the filter rectifier circuit and the input end of the transformer (2) are connected in sequence, the control and gallium nitride switch integrated circuit (3) is connected to the input end of the transformer (2), and the output rectifier circuit (8) is arranged between the output end of the transformer (2) and the voltage output end (6) of the display power supply.

2. The display power supply system according to claim 1, characterized in that: The circuit substrate assembly comprises: a PCB board, the front side of which is provided with the control and gallium nitride switch integrated circuit (3), and the back side of which is provided with a plurality of heat conducting sheets.

3. The display power supply system according to claim 2, characterized in that: The control and gallium nitride switch integrated circuit (3) comprises: a gallium nitride switch controller, a power switch circuit and an optical coupler drive circuit, wherein the power switch circuit is provided with a gallium nitride controller, the optical coupler drive circuit is provided with a gallium nitride optical coupler device, and the level input pin of the gallium nitride controller is connected to the gallium nitride switch controller via the gallium nitride optical coupler device.

4. The display power supply system according to claim 3, characterized in that: The filtering and rectifying circuit comprises: an EMI filtering circuit (41), a rectifying circuit (42) and a filtering circuit (43) connected in sequence, the EMI filtering circuit (43) being connected to the input circuit (1), and the filtering circuit (43) being connected to the input end of the transformer (2).

5. The display power supply system according to claim 4, characterized in that: Also includes: A filter output device (5) is connected between the output rectifier circuit (8) and the voltage output terminal (6).

6. The display power supply system according to claim 5, characterized in that: The circuit substrate assembly is provided with a detection circuit (7), and the detection circuit (7) is connected to the input end of the filter output device (5).

7. The display power supply system according to claim 3, characterized in that: Two heat conducting plates are arranged on the back of the PCB board, and the positions of the two heat conducting plates correspond to the gallium nitride switch controller and the gallium nitride controller.

8. The display power supply system according to claim 7, wherein: A heat-conducting silica gel layer is adhered to the surface of the heat-conducting sheet.

9. The display power supply system according to claim 1, wherein: The upper shell and the lower shell are connected by a sealing adhesive strip.

10. A display, characterized in that: include: A display power supply system as described in any one of claims 1 to 9.

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