Power supply device of liquid crystal display equipment

Abstract

The utility model belongs to the technical field of power supply of LCD (liquid crystal display) equipment, and particularly relates to a power supply device of liquid crystal display equipment, which comprises a power adapter, the power adapter comprises a rectifier module, a first constant voltage output module and a backlight voltage output module, and a direct current voltage conversion module is arranged in the liquid crystal display equipment. The first constant voltage output module outputs first voltage and is connected with the power supply input end of a mainboard of the liquid crystal display device, and the backlight voltage output module outputs backlight voltage and is connected with the input end of the direct current voltage conversion module. Two paths of voltage outputs are formed in the power adapter, different voltage inputs are provided for the backlight LED and other parts of the liquid crystal display equipment, and the power supply requirements of different parts are effectively met. Meanwhile, the current output by the power adapter to the liquid crystal display device is small, the wire cost is reduced, the voltage difference between the two ends of the DC / DC constant current module is small, and the device cost is further reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to LCD display equipment power supply technical field, specifically related to a liquid crystal display equipment's power supply device. BACKGROUND

[0002] Liquid crystal display equipment (LCD) utilizes liquid crystal panel to control the passing of light and display image by electrically controlling the arrangement of liquid crystal molecules. Liquid crystal display screen itself does not emit light, and needs backlight source to provide light source, usually uses LED backlight technology, combines liquid crystal layer to carry out image display.

[0003] Referring to Figure 1 As shown in the figure, the power supply system of liquid crystal display equipment includes multiple parts, usually adopts power adapter to convert alternating current into direct current, supplies the backlight drive circuit, mainboard and the control chip connected with it, power amplifier and liquid crystal screen of equipment, and the working voltage of backlight drive circuit is generally higher than other components. Therefore, the power adapter output low voltage and large current for liquid crystal display equipment is generally adopted in prior art, and in order to meet the higher voltage direct current power supply of backlight drive circuit, a DC / DC constant current module is generally additionally configured for it. The current output from power adapter to liquid crystal display equipment is large in this power supply structure, which leads to the increase of cost of wire and rectification part of power adapter, and the cost of DC / DC constant current module is also high under large pressure difference. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to overcome the defect that the power supply system of liquid crystal display equipment in prior art leads to high equipment cost due to the high demand voltage of backlight drive circuit, so as to provide a power supply device of liquid crystal display equipment.

[0005] The utility model discloses a kind of power supply devices of liquid crystal display equipment, including power adapter, the power adapter includes rectification module, first constant voltage output module and backlight voltage output module;DC voltage conversion module is provided in the liquid crystal display equipment;

[0006] The input end of the rectification module is connected with the alternating voltage input of the power adapter, and the output end is connected with the input end of the first constant voltage output module and the backlight voltage output module respectively;The first constant voltage output module outputs first voltage, and is connected with the power input end of the mainboard of the liquid crystal display equipment;The backlight voltage output module outputs backlight voltage, and is connected with the input end of the DC voltage conversion module, and the output end of the DC voltage conversion module is connected with the power input end of the backlight LED of the liquid crystal display equipment.

[0007] Further, the power adapter further includes output ground, and the output ground is connected with the ground of the mainboard and the ground of the backlight LED respectively.

[0008] Further, the power adapter further comprises a mainboard output ground end and a backlight output ground end, the mainboard output ground end is connected with the ground end of the mainboard, and the backlight output ground end is connected with the ground end of the backlight LED.

[0009] Further, the power adapter further comprises a second constant voltage output module, the input end of the second constant voltage output module is connected with the output end of the rectifier module, and the output end of the second constant voltage output module is connected with another power supply input end of the mainboard of the liquid crystal display device.

[0010] Further, the power adapter further comprises an EMI module, the input end of the EMI module is connected with the alternating voltage input of the power adapter, and the output end of the EMI module is connected with the input end of the rectifier module.

[0011] Further, the first constant voltage output module and the backlight voltage output module of the power adapter are feedback control circuits.

[0012] Further, the feedback control circuit is one or more of a linear voltage stabilizer, a switching voltage stabilizer, an optocoupler feedback circuit and a PWM control circuit.

[0013] Further, the direct current voltage conversion module is a DC / DC constant current module.

[0014] Beneficial effects: the utility model discloses a kind of power supply devices of liquid crystal display device, including power adapter, power adapter includes rectifier module, first constant voltage output module and backlight voltage output module, direct current voltage conversion module is provided in liquid crystal display device, the input end of rectifier module is connected with the alternating voltage input of power adapter, and the output end is connected with the input end of first constant voltage output module and backlight voltage output module respectively, first constant voltage output module outputs first voltage, and connects the power supply input end of the mainboard of liquid crystal display device, backlight voltage output module outputs backlight voltage, and connects the input end of direct current voltage conversion module, the output end of direct current voltage conversion module is connected with the power supply input end of the backlight LED of liquid crystal display device.The utility model provides two voltage outputs by being formed in power adapter, provides different voltage input for backlight LED and other components of liquid crystal display device, effectively meets the power supply demand of different components.Electric current that power adapter exports to liquid crystal display device is small simultaneously, reduces wire cost, and the voltage difference of the two ends of DC / DC constant current module is small, and equipment cost is further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 A schematic block diagram of a power supply device for a liquid crystal display device in the prior art;

[0017] Figure 2 A schematic block diagram of a power supply device for a liquid crystal display device in the prior art;

[0018] Figure 3 A schematic block diagram of a power supply device for a liquid crystal display device in the prior art. DETAILED DESCRIPTION

[0019] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a comprehensive understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0020] In the description of the present application, it should be understood that in the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0021] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Embodiment one:

[0023] Reference Figure 2As shown, the embodiment discloses a power supply device of a liquid crystal display device, comprising a power adapter, the power adapter comprising a rectifier module, a first constant voltage output module and a backlight voltage output module; a direct current voltage conversion module is arranged in the liquid crystal display device; the input end of the rectifier module is connected with the alternating voltage input of the power adapter, and the output end is respectively connected with the input end of the first constant voltage output module and the backlight voltage output module; the first constant voltage output module outputs a first voltage and is connected with the power input end of the mainboard of the liquid crystal display device; the backlight voltage output module outputs a backlight voltage and is connected with the input end of the direct current voltage conversion module, and the output end of the direct current voltage conversion module is connected with the power input end of the backlight LED of the liquid crystal display device.

[0024] The power supply device of the liquid crystal display device provided by the embodiment forms two voltage output paths in the power adapter, provides different voltage inputs for the backlight LED and other components of the liquid crystal display device, and effectively meets the power supply requirements of different components. Meanwhile, the current output from the power adapter to the liquid crystal display device is small, the wire cost is reduced, and the voltage difference between the two ends of the DC / DC constant current module is small, further reducing the equipment cost.

[0025] In the embodiment, the mainboard is connected with components including a control chip, a liquid crystal screen and a power supply, and provides power supply for these components.

[0026] In some embodiments of the embodiment, the power adapter further comprises an output ground end, and the output ground end is respectively connected with the ground end of the mainboard and the ground end of the backlight LED.

[0027] In some other embodiments of the embodiment, the power adapter further comprises a mainboard output ground end and a backlight output ground end, the mainboard output ground end is connected with the ground end of the mainboard, and the backlight output ground end is connected with the ground end of the backlight LED.

[0028] As a further improvement of the embodiment, the power adapter further comprises an EMI module, the input end of the EMI module is connected with the alternating voltage input of the power adapter, and the output end of the EMI module is connected with the input end of the rectifier module. The EMI module (electromagnetic interference module) in the power adapter is mainly used for inhibiting noise propagation, reducing external interference and improving product reliability and compliance. The EMI module can reduce and inhibit electromagnetic interference (EMI) generated by the power supply during operation, so as to ensure that the equipment meets the electromagnetic compatibility (EMC) standard.

[0029] In the embodiment, the first constant voltage output module and the backlight voltage output module of the power adapter are feedback control circuits. In the embodiment, the feedback control circuit is one or more of a linear voltage stabilizer, a switching voltage stabilizer, an optocoupler feedback circuit, and a PWM control circuit. As a preferred embodiment, the feedback control circuit is a linear voltage stabilizer.

[0030] As a preferred embodiment, the direct-current voltage conversion module is a DC / DC constant current module.

[0031] Specifically, the first constant voltage output module outputs a first voltage, and the backlight voltage output module outputs a backlight voltage, which is greater than the first voltage. In the embodiment, the backlight voltage is half of the backlight LED voltage, specifically 60V, and the first voltage is 12V or 18V or 24V.

[0032] Embodiment two:

[0033] Referring to Figure 3 On the basis of embodiment one, the power adapter further includes a second constant voltage output module, an input end of the second constant voltage output module is connected to an output end of the rectifier module, and an output end of the second constant voltage output module is connected to another power supply input end of a mainboard of the liquid crystal display device.

[0034] Specifically, the second constant voltage output module outputs a second voltage, which is greater than the first voltage and less than the backlight voltage, for providing power supply for some other components of the liquid crystal display. In the embodiment, the backlight voltage is half of the backlight LED voltage, the first voltage is 12V, and the second voltage is 18V or 24V.

[0035] In the embodiment, the power adapter further includes a second output ground end, which is used in cooperation with the second constant voltage output module.

[0036] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0037] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the application, and these are within the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A power supply device for a liquid crystal display device, characterized in that, The device includes a power adapter, which comprises a rectifier module, a first constant voltage output module, and a backlight voltage output module; the liquid crystal display device is equipped with a DC voltage conversion module. The input terminal of the rectifier module is connected to the AC voltage input of the power adapter, and the output terminal is connected to the input terminals of the first constant voltage output module and the backlight voltage output module, respectively. The first constant voltage output module outputs a first voltage and is connected to the power supply input terminal of the motherboard of the liquid crystal display device; the backlight voltage output module outputs a backlight voltage and is connected to the input terminal of the DC voltage conversion module, and the output terminal of the DC voltage conversion module is connected to the power supply input terminal of the backlight LED of the liquid crystal display device.

2. The power supply device for a liquid crystal display device according to claim 1, characterized in that, The power adapter also includes an output ground terminal, which is connected to the ground terminal of the motherboard and the ground terminal of the backlight LED.

3. The power supply device for a liquid crystal display device according to claim 1, characterized in that, The power adapter also includes a motherboard output ground terminal and a backlight output ground terminal. The motherboard output ground terminal is connected to the ground terminal of the motherboard, and the backlight output ground terminal is connected to the ground terminal of the backlight LED.

4. The power supply device for a liquid crystal display device according to claim 1, characterized in that, The power adapter also includes a second constant voltage output module. The input terminal of the second constant voltage output module is connected to the output terminal of the rectifier module, and the output terminal of the second constant voltage output module is connected to another power input terminal of the motherboard of the liquid crystal display device.

5. A power supply device for a liquid crystal display device according to claim 1, characterized in that, The power adapter also includes an EMI module, the input of which is connected to the AC voltage input of the power adapter, and the output of which is connected to the input of the rectifier module.

6. The power supply device for a liquid crystal display device according to claim 1, characterized in that, Both the first constant voltage output module and the backlight voltage output module of the power adapter are feedback control circuits.

7. A power supply device for a liquid crystal display device according to claim 6, characterized in that, The feedback control circuit is one or more of the following: a linear regulator, a switching regulator, an optocoupler feedback circuit, and a PWM control circuit.

8. A power supply device for a liquid crystal display device according to claim 1, characterized in that, The DC voltage conversion module is a DC / DC constant current module.

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