CN217444050U - An LED display power supply device - Google Patents

Abstract

The utility model discloses a power supply device for an LED display screen, comprising a plurality of power supply boxes, wherein the power supply box includes an adapter board module and an LED light board module, and the adapter board module includes a receiving card unit, a first step-down unit and a second step-down unit, the input end of the receiving card unit is connected with a sending card unit, the output end of the receiving card unit is connected to the input end of the first step-down unit, the first step-down unit of the first step-down unit An output end is connected to the second step-down unit, the second output end of the first step-down unit is connected to the input end of the LED light panel module, and the third output end of the first step-down unit is connected to the adjacent power supply The first step-down unit in the box is connected. In the present invention, the commercial power is stepped down by means of the adapter board module in the power supply box, and different equipment is supplied with power through a plurality of units, which can reduce the time between the adapter board module and the LED light board module. Heat generation, so as to achieve energy saving and reduce color drift.

Description

An LED display power supply device

technical field

The utility model relates to a power supply device for an LED display screen, in particular to a power supply device for an LED display screen.

Background technique

The current LED display power supply method basically uses an external power supply for power supply. The input voltage is generally between 4.2V-5V, and the input current is large. This power supply technology will cause a large amount of heat inside the circuit board due to the large current. It will seriously affect the luminous color of the LED light, resulting in color drift, and power loss. The power supply to the LED light board will also produce a voltage drop. These problems will affect the display effect of the display.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a power supply device for an LED display screen, which can solve the problems of large heat loss and unstable power supply in the existing power supply mode.

In order to achieve the above object, the technical scheme adopted by the present utility model is as follows:

A power supply device for an LED display screen, comprising a plurality of power supply boxes, the power supply box includes an adapter board module and an LED light board module, and the adapter board module includes a receiving card unit, a first step-down unit and a second step-down unit. The input end of the receiving card unit is connected to the sending card unit, the output end of the receiving card unit is connected to the input end of the first step-down unit, and the first output end of the first step-down unit is connected to the first step-down unit. Two step-down units are connected, the second output end of the first step-down unit is connected to the input end of the LED light panel module, and the third output end of the first step-down unit is connected to the third output end of the adjacent power supply box. A step-down unit is connected.

Preferably, the first step-down unit includes a transformer T1, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor CL and a resistor RL, the input end of the transformer T1 is connected to the output end of the receiving card unit, and the The cathode of the diode D4 and the anode of the diode D1 are both connected to the anode of the output end of the transformer T1, the anode of the diode D2 and the cathode of the diode D3 are both connected to the cathode of the output end of the transformer T1, and the cathode of the diode D1 and the cathode of the diode D2 are connected. The negative electrode, one end of the capacitor CL, one end of the resistor RL, the input end of the second step-down unit, and the input end of the LED light panel module are all connected to the first step-down unit in the adjacent power supply box. The anode, the anode of the diode D4, the other end of the capacitor CL and the other end of the resistor RL are all grounded.

Preferably, the second step-down unit includes a capacitor Cin1, a chip U1, a capacitor CF1, a diode D5, an inductor L1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor Cout1, one end of the capacitor Cin1, the input terminal VIN of the chip U1, The cathode of the diode D1, the cathode of the diode D2, one end of the capacitor CL and one end of the resistor RL are all connected to the first step-down unit in the adjacent power supply box, and the extended end BS of the chip U1 is connected to one end of the capacitor CF1. , the other end of the capacitor CF1, the inductor end SW of the chip U1 and the negative electrode of the diode D5 are all connected to one end of the inductor L1, the other end of the inductor L1, one end of the resistor R1, one end of the capacitor C1 and the capacitor Cout1 One end is connected to an external device, the other end of the resistor R1, one end of the resistor R2 and the other end of the capacitor C1 are all connected to the output feedback terminal FB of the chip U1, the other end of the capacitor Cin1, the ground terminal GND of the chip U1 , the other end of the resistor R2 and the other end of the capacitor Cout1 are both grounded.

Preferably, the LED light panel module includes a third step-down unit for connecting a red constant current driver chip and a fourth step-down unit for connecting a green constant current driver chip and a blue constant current driver chip. The input ends of the three step-down units and the input end of the fourth step-down unit are both connected to the second output end of the first step-down unit.

Compared with the prior art, the beneficial effect of the present utility model is that the mains power is stepped down by means of the adapter board module in the power supply box, and different equipment is supplied with power through a plurality of units, which can reduce the number of switches. The heat of the board module and the LED light board module can be saved, so as to achieve energy saving and reduce color drift.

Description of drawings

FIG. 1 is a schematic diagram of the practical application of the power supply device for the LED display screen described in the present invention.

FIG. 2 is a circuit diagram of the first step-down unit described in the present invention.

FIG. 3 is a circuit diagram of the second step-down unit described in the present invention.

Detailed ways

The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model, but not to limit the present utility model.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. Therefore, it should not be construed as a limitation on the present invention. Furthermore, the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Below, in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

As shown in Figures 1-3, a power supply device for an LED display screen includes a number of power supply boxes, the power supply box includes an adapter board module and an LED light board module, and the adapter board module includes a receiving card unit, a first A step-down unit and a second step-down unit, the input end of the receiving card unit is connected with a sending card unit, the output end of the receiving card unit is connected to the input end of the first step-down unit, the first step-down unit The first output end of the unit is connected to the second step-down unit, the second output end of the first step-down unit is connected to the input end of the LED light panel module, and the third output end of the first step-down unit is connected to the phase The first step-down unit in the adjacent power supply box is connected. Preferably, the first step-down unit includes a transformer T1, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor CL and a resistor RL, the input end of the transformer T1 is connected to the output end of the receiving card unit, and the The cathode of the diode D4 and the anode of the diode D1 are both connected to the anode of the output end of the transformer T1, the anode of the diode D2 and the cathode of the diode D3 are both connected to the cathode of the output end of the transformer T1, the cathode of the diode D1, the cathode of the diode D2 The negative electrode, one end of the capacitor CL, one end of the resistor RL, the input end of the second step-down unit, and the input end of the LED light panel module are all connected to the first step-down unit in the adjacent power supply box. The anode, the anode of the diode D4, the other end of the capacitor CL and the other end of the resistor RL are all grounded. In this embodiment, the 220V mains power transmitted from the sending card unit is stepped down into 36V alternating current through the transformer T1, and then the 36V alternating current is converted into 36V direct current through the finishing circuit composed of the pole tube D1, the diode D2, the diode D3 and the diode D4. , preferably, the 36V direct current output by the first step-down unit is connected to the first step-down unit in the adjacent power supply box, so that when a fault occurs in a power supply box, the adjacent power supply box can supply power , reduce the impact of failure.

Preferably, the second step-down unit includes a capacitor Cin1, a chip U1, a capacitor CF1, a diode D5, an inductor L1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor Cout1, one end of the capacitor Cin1, the input terminal VIN of the chip U1, The cathode of the diode D1, the cathode of the diode D2, one end of the capacitor CL and one end of the resistor RL are all connected to the first step-down unit in the adjacent power supply box, and the extended end BS of the chip U1 is connected to one end of the capacitor CF1. , the other end of the capacitor CF1, the inductor end SW of the chip U1 and the negative electrode of the diode D5 are all connected to one end of the inductor L1, the other end of the inductor L1, one end of the resistor R1, one end of the capacitor C1 and the capacitor Cout1 One end is connected to an external device, the other end of the resistor R1, one end of the resistor R2 and the other end of the capacitor C1 are all connected to the output feedback terminal FB of the chip U1, the other end of the capacitor Cin1, the ground terminal GND of the chip U1 , the other end of the resistor R2 and the other end of the capacitor Cout1 are both grounded. Specifically, the chip U1 can be a chip with a model of PW2558, which will step down the 36V direct current. Preferably, the second step-down unit supplies power to the external 74HC245 chip and the receiving card unit.

Preferably, the LED light panel module includes a third step-down unit for connecting a red constant current driver chip and a fourth step-down unit for connecting a green constant current driver chip and a blue constant current driver chip. The input ends of the third step-down unit and the fourth step-down unit are both connected to the second output end of the first step-down unit. In this embodiment, both the third step-down unit and the fourth step-down unit can use the same circuit structure as the second step-down unit (as shown in FIG. 3 ). According to the formula: VOUT=(1+R1/R2) *0.6, where VOUT is the output voltage, to select the resistance values of resistor R1 and resistor R2, so that the third step-down unit outputs 3.3V voltage to the red constant current driver chip, and the fourth step-down unit outputs the green constant current driver chip and the fourth step-down unit respectively. The blue constant current driver chip outputs a voltage of 3.8V, realizes the step-down of the mains, and supplies power to different devices through multiple units, which can reduce the heat generation of the adapter board module and the LED light board module, so as to achieve Energy saving and lightening of color drift.

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (4)

1. A power supply device for an LED display screen, characterized in that it includes several power supply boxes, the power supply boxes include an adapter board module and an LED light board module, and the adapter board module includes a receiving card unit, a first drop The input end of the receiving card unit is connected with the sending card unit, the output end of the receiving card unit is connected to the input end of the first pressure reducing unit, and the output end of the first pressure reducing unit is The first output end is connected to the second step-down unit, the second output end of the first step-down unit is connected to the input end of the LED lamp panel module, and the third output end of the first step-down unit is connected to the adjacent The first step-down unit in the power supply box is connected. 2. The power supply device for an LED display screen according to claim 1, wherein the first step-down unit comprises a transformer T1, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor CL and a resistor RL, and the The input end of the transformer T1 is connected to the output end of the receiving card unit, the cathode of the diode D4 and the anode of the diode D1 are both connected to the anode of the output end of the transformer T1, the anode of the diode D2 and the cathode of the diode D3 are both connected to the transformer T1 The cathode of the output end of the diode D1 is connected to the cathode of the diode D1, the cathode of the diode D2, one end of the capacitor CL, one end of the resistor RL, the input end of the second step-down unit, and the input end of the LED light board module are all connected to the adjacent power supply The first step-down unit in the box is connected, and the anode of the diode D3, the anode of the diode D4, the other end of the capacitor CL and the other end of the resistor RL are all grounded. 3. The LED display power supply device according to claim 2, wherein the second step-down unit comprises a capacitor Cin1, a chip U1, a capacitor CF1, a diode D5, an inductor L1, a resistor R1, a resistor R2, a capacitor C1 and a capacitor Cout1, one end of the capacitor Cin1, the input end VIN of the chip U1, the cathode of the diode D1, the cathode of the diode D2, one end of the capacitor CL and one end of the resistor RL are all connected to the first step-down unit in the adjacent power supply box. Connection, the expansion end BS of the chip U1 is connected to one end of the capacitor CF1, the other end of the capacitor CF1, the inductance end SW of the chip U1 and the negative electrode of the diode D5 are all connected to one end of the inductor L1, and the other end of the inductor L1 is connected. One end, one end of the resistor R1, one end of the capacitor C1 and one end of the capacitor Cout1 are all connected to external devices, and the other end of the resistor R1, one end of the resistor R2 and the other end of the capacitor C1 are all connected to the output feedback end FB of the chip U1 , the other end of the capacitor Cin1, the ground terminal GND of the chip U1, the other end of the resistor R2 and the other end of the capacitor Cout1 are all grounded. 4. The power supply device for an LED display screen according to claim 1, wherein the LED light panel module comprises a third step-down unit for externally connecting a red constant current driver chip and a third step-down unit for externally connecting a green constant current driver chip and The fourth step-down unit of the blue constant current drive chip, the input end of the third step-down unit and the input end of the fourth step-down unit are both connected with the second output end of the first step-down unit.

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