Alternating current power supply device of advertising machine

Abstract

The utility model relates to an alternating-current power supply device of an advertising machine, which comprises a plurality of backlight source modules and a light guide plate, each backlight source module comprises an LED lamp bead string group and an alternating-current driving dimming module, and the alternating-current driving dimming module is electrically connected to the LED lamp bead string group and provides a power supply for the LED lamp bead string group; the backlight source modules are arranged on the light inlet side of the light guide plate side by side and provide backlight sources for the liquid crystal display screen. A plurality of backlight source modules which are arranged in parallel are adopted to provide backlight sources for the liquid crystal panel. Due to the fact that the number of the LED lamp beads in each LED lamp bead string group is limited, an alternating current driving dimming module for LED lighting can be adopted, due to the fact that the alternating current driving dimming module for LED lighting is small in size and occupied space and can be installed on one side of the LED lamp bead string group, and the alternating current driving dimming modules are installed in a scattered mode, a whole machine power supply box of the advertising machine is omitted, and the advertising machine is convenient to use. And the volume and the occupied space of the advertising machine are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for advertising machines, and in particular to an AC power supply device for an advertising machine. Background Art

[0002] The advertising machine is a complete advertising broadcast control system composed of terminal software control, network information transmission and multimedia terminal display. It can carry out advertising, broadcast weather forecasts or foreign exchange rates, etc. through multimedia information such as pictures, texts, videos, and small plug-ins.

[0003] Vertical advertising machines are also called floor-standing advertising machines. They are usually placed in public places such as shopping malls, supermarkets, financial institutions, subway stations, etc. to provide people with intelligent interaction, public services, entertainment interactive information or advertising. Vertical advertising machines are equipped with two back-to-back LCD screens. In order to provide power for the two LCD screens, a high-power power supply box is usually set under the LCD screen. Since the power supply box needs to supply power to the two LCD screens, the power supply box is large in size, which makes the entire advertising machine occupy a large space. Utility Model Content

[0004] In view of this, it is necessary to provide an AC power supply device for an advertising machine that occupies a small space and has a simple structure.

[0005] An AC power supply device for an advertising machine is used to power a backlight source of a liquid crystal display screen, comprising a plurality of backlight source modules and a light guide plate, each of the backlight source modules comprising an LED lamp bead string group and an AC drive dimming module, the output end of the AC drive dimming module being electrically connected to the LED lamp bead string group to provide power for the LED lamp bead string group; a plurality of the backlight source modules are arranged in parallel on the light incident side of the light guide plate to provide a backlight source for the liquid crystal display screen.

[0006] Preferably, the AC drive dimming module includes an AC drive module and a lamp bead adjustment module, the AC drive module includes a rectifier circuit and a voltage stabilizing circuit connected in sequence, the rectifier circuit has AC input terminals L and N, the AC input terminals L and N of the rectifier circuit are connected to a 220V AC power supply system, the output terminal of the rectifier circuit is connected to the input terminal of the voltage stabilizing circuit, the output terminal of the voltage stabilizing circuit is connected to the LED lamp bead string group, and the rectifier circuit and the voltage stabilizing circuit are the driving circuits of the LED lamp bead string group.

[0007] Preferably, the LED lamp bead string group includes a plurality of LED lamp beads, and each of the LED lamp beads is connected in series, in parallel, in series first and then in parallel, or in parallel first and then in series.

[0008] Preferably, it also includes a system management chip and a photoelectric sensor, wherein the output end of the photoelectric sensor is connected to the SDA pin and the SCL pin of the system management chip, and the photoelectric sensor is used to detect the intensity of external light and transmit it to the system management chip.

[0009] Preferably, the input end of the lamp bead adjustment module is connected to the DA+ pin and the DA- pin of the system management chip, and the lamp bead adjustment module adjusts the brightness of the LED lamp bead according to the intensity of the external light detected by the photoelectric sensor.

[0010] Preferably, a plurality of the backlight source modules are connected in parallel to the output end of the system management chip, and the brightness of each LED lamp bead string group is controlled by the system management chip, so that the brightness of the entire liquid crystal display screen remains consistent.

[0011] In the AC power supply device of the above-mentioned advertising machine, multiple backlight source modules are arranged in parallel to provide backlight source for the liquid crystal panel. Since the number of LED lamp beads in each LED lamp bead string group is limited, the AC drive dimming module for LED lighting can be used. Since the AC drive dimming module for LED lighting is small in size and occupies little space, it can be installed on one side of the LED lamp bead string group. Multiple AC drive dimming modules are installed in a dispersed manner, so that the advertising machine eliminates the power supply box of the whole machine, greatly reducing the size and occupied space of the advertising machine. The product structure of the utility model is simple, easy to produce, low in cost, and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the circuit structure of the backlight source module of the AC power supply device of the advertising machine according to the embodiment of the utility model.

[0013] Figure 2 It is a schematic diagram of the circuit structure of the photoelectric sensor of the AC power supply device of the advertising machine according to the embodiment of the utility model.

[0014] Figure 3 It is a circuit structure diagram of a system management chip of an AC power supply device of an advertising machine according to an embodiment of the utility model.

[0015] Figure 4 It is a schematic diagram of the circuit structure of the LED lamp bead string group of the AC power supply device of the advertising machine according to the embodiment of the utility model.

[0016] Figure 5 It is a structural schematic diagram of an AC power supply device of an advertising machine according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0018] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , showing an AC power supply device of an advertising machine provided by an embodiment of the utility model, which is used for powering the backlight light source of a liquid crystal display screen, including multiple backlight light source modules 100 and a light guide plate, each of the backlight light source modules 100 includes an LED lamp bead string group 20 and an AC drive dimming module 10, and the output end of the AC drive dimming module 10 is electrically connected to the LED lamp bead string group 20 to provide power for the LED lamp bead string group 20; multiple backlight light source modules 10 are arranged in parallel on the light incident side of the light guide plate to provide backlight light sources for the liquid crystal display screen.

[0019] Specifically, the double-sided advertising machine in this embodiment has two LCD screens arranged back to back, each of which includes a plurality of backlight source modules 100 and a light guide plate (not shown), and one AC drive dimming module 10 provides power supply for one LED lamp bead string group 20, and the AC drive dimming module 10 uses 220V AC power input. The AC drive dimming module 10 is small in size and can be installed on one side of the LED lamp bead string group 20, which greatly reduces the space occupied by the backlight source module 100.

[0020] Preferably, the AC drive dimming module 10 includes an AC drive module and a lamp bead adjustment module, the AC drive module includes a rectifier circuit and a voltage stabilizing circuit connected in sequence, the rectifier circuit has AC input terminals L and N, the AC input terminals L and N of the rectifier circuit are connected to a 220V AC power supply system, the output terminal of the rectifier circuit is connected to the input terminal of the voltage stabilizing circuit, the output terminal of the voltage stabilizing circuit is connected to the LED lamp bead string group 20, and the rectifier circuit and the voltage stabilizing circuit are the driving circuits of the LED lamp bead string group 20.

[0021] Preferably, the LED lamp bead string group 20 includes a plurality of LED lamp beads, and each of the LED lamp beads is connected in series, in parallel, in series first and then in parallel, or in parallel first and then in series.

[0022] Specifically, the number of LED lamp beads in the LED lamp bead string group 20 is also related to the output power of the AC driving dimming module 10 .

[0023] Specifically, in this embodiment, the LED lamp beads in each of the LED lamp bead string groups are connected in series first and then in parallel, and one of the AC drive dimming modules provides power and drive signals.

[0024] Preferably, it also includes a system management chip 300 and a photoelectric sensor 200 , the output end of the photoelectric sensor 200 is connected to the SDA pin and the SCL pin of the system management chip 300 , and the photoelectric sensor 200 is used to detect the intensity of external light and transmit it to the system management chip 300 .

[0025] Preferably, the input end of the lamp bead adjustment module is connected to the DA+ pin and the DA- pin of the system management chip 300 , and the lamp bead adjustment module adjusts the brightness of the LED lamp bead according to the intensity of the external light detected by the photoelectric sensor 200 .

[0026] Specifically, the brightness of the LED lamp beads is adjusted in real time according to the brightness of the external light to reduce power consumption and provide people with a comfortable viewing effect.

[0027] Specifically, the liquid crystal display screen also includes a liquid crystal panel, which is arranged outside the backlight source module 100, and a plurality of the backlight source modules 100 are sequentially arranged in parallel on the back of the liquid crystal panel to provide backlight for the liquid crystal panel.

[0028] Specifically, the liquid crystal panel is connected to the system management chip 300 via an HDMI interface, and the liquid crystal panel receives and plays the audio / video signal transmitted by the system management chip 300 .

[0029] Specifically, the LCD screen consists of a liquid crystal panel and a backlight source. Since the liquid crystal panel itself does not emit light, it needs an external light source to achieve transmission or reflection display. Since the liquid crystal panel and the backlight source are set separately, the change of the backlight source will not affect the picture quality of the liquid crystal panel.

[0030] In this embodiment, the plurality of backlight source modules 100 are divided into two groups to provide backlight sources for two back-to-back LCD screens. In this embodiment, each LCD screen includes eight backlight source modules 100 arranged in parallel, and each backlight source module 100 includes an AC drive dimming module 10 and an LED lamp bead string group 20. The AC drive dimming module 10 provides power and drive signals for the LED lamp bead string group 20.

[0031] In this embodiment, the AC-driven dimming module 10 for LED lighting is used to replace the original power supply box. Since the AC-driven dimming module 10 in the LED lighting circuit has the characteristics of small size, simple circuit structure, convenient wiring, stable operation, and low circuit loss, the overall size of the advertising machine is reduced and the operation is more stable.

[0032] Preferably, see Figure 5, multiple backlight source modules 100 are connected in parallel to the output end of the system management chip 300, and the brightness of each LED lamp bead string group 20 is controlled by the system management chip 300, so that the brightness of the entire LCD display screen remains consistent.

[0033] Specifically, in this embodiment, the AC driving dimming module 10 adopts a power supply module for LED lighting, and the installation structure and circuit structure of the power supply module for LED lighting are not described in detail.

[0034] In the AC power supply device of the above-mentioned advertising machine, multiple backlight source modules 100 are arranged in parallel to provide backlight source for the liquid crystal panel. Since the number of LED lamp beads in each LED lamp bead string group 20 is limited, the AC drive dimming module 10 for LED lighting can be used. Since the AC drive dimming module 10 for LED lighting is small in size and occupies little space, it can be installed on one side of the LED lamp bead string group 20. Multiple AC drive dimming modules 10 are installed in a dispersed manner, so that the advertising machine eliminates the power supply box of the whole machine, greatly reducing the size and occupied space of the advertising machine. The product structure of the utility model is simple, easy to produce, low in cost, and easy to promote.

[0035] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, those skilled in the art may also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.

Claims

1. An AC power supply device for an advertising machine, used for powering a backlight source of a liquid crystal display, characterized in that: It includes multiple backlight source modules and a light guide plate, each of the backlight source modules includes an LED lamp bead string group and an AC drive dimming module, the output end of the AC drive dimming module is electrically connected to the LED lamp bead string group to provide power for the LED lamp bead string group; the multiple backlight source modules are arranged in parallel on the light incident side of the light guide plate to provide backlight source for the liquid crystal display.

2. The AC power supply device of an advertising machine as claimed in claim 1, characterized in that: The AC drive dimming module includes an AC drive module and a lamp bead adjustment module. The AC drive module includes a rectifier circuit and a voltage stabilizing circuit connected in sequence. The rectifier circuit has AC input terminals L and N. The AC input terminals L and N of the rectifier circuit are connected to a 220V AC power supply system. The output terminal of the rectifier circuit is connected to the input terminal of the voltage stabilizing circuit. The output terminal of the voltage stabilizing circuit is connected to the LED lamp bead string group. The rectifier circuit and the voltage stabilizing circuit are the driving circuits of the LED lamp bead string group.

3. The AC power supply device of an advertising machine as claimed in claim 2, characterized in that: The LED lamp bead string group includes a plurality of LED lamp beads, and each of the LED lamp beads is connected in series, in parallel, in series first and then in parallel, or in parallel first and then in series.

4. The AC power supply device of an advertising machine as claimed in claim 3, characterized in that: It also includes a system management chip and a photoelectric sensor, wherein the output end of the photoelectric sensor is connected to the SDA pin and the SCL pin of the system management chip, and the photoelectric sensor is used to detect the intensity of external light and transmit it to the system management chip.

5. The AC power supply device of an advertising machine as claimed in claim 4, characterized in that: The input end of the lamp bead adjustment module is connected to the DA+ pin and the DA- pin of the system management chip, and the lamp bead adjustment module adjusts the brightness of the LED lamp bead according to the intensity of the external light detected by the photoelectric sensor.

6. The AC power supply device of an advertising machine as claimed in claim 5, characterized in that: A plurality of the backlight source modules are connected in parallel to the output end of the system management chip, and the brightness of each LED lamp bead string group is controlled by the system management chip, so that the brightness of the entire liquid crystal display screen remains consistent.

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