CN211240182U - Novel LED display screen's module of being shaded altogether - Google Patents

Abstract

The utility model discloses a novel common-cathode module of an LED display screen, which comprises a power supply, a voltage reduction circuit, a red lamp driving circuit, a green lamp driving circuit, a blue lamp driving circuit, a red lamp group, a green lamp group and a blue lamp group; the power supply supplies direct current to the green lamp driving circuit and the blue lamp driving circuit, and the green lamp driving circuit and the blue lamp driving circuit respectively supply power to the green lamp group and the blue lamp group; the power supply supplies power to the voltage reduction circuit by direct current, the voltage reduction circuit adjusts the voltage of the direct current and supplies power to the red light driving circuit, and the red light driving circuit supplies power to the red light group. The utility model discloses in, power supply direct power supply gives green lamp drive circuit, blue lamp drive circuit, and rethread step-down circuit reduces power supply's voltage and supplies power for red lamp drive circuit, can reach R, GB separately supplies power, and accurate distribution voltage electric current is to red, green blue banks, only needs to be equipped with a step-down integrated chip U, realizes cold screen in cloudy altogether, has reduced component cost and cost of manufacture.

Description

A common cathode module for a new type of LED display

technical field

The utility model relates to the technical field of LED display screens, in particular to a common cathode module of a novel LED display screen.

Background technique

Conventional LED displays generally include red, green, and blue lamp beads. Among them, the voltage requirement of the red lamp bead is lower than that of the other two lamp beads. Commonly, the voltage of red lamp beads requires about 2.5V, and the voltage of blue lamp beads and green lamp beads requires about 3.8V.

The common cathode cold screen adopts R and GB power supply separately, that is, accurately distributes the voltage and current to the red, green and blue lamp beads, and the current passes through the lamp beads and then to the negative pole of the IC, the forward voltage is reduced, and the on-resistance is small. The separate power supply scheme effectively reduces the power consumption and greatly reduces the heat generated during the operation of the display screen.

The authorization announcement number CN201489799U discloses a power supply circuit. The power supply circuit includes a switching power supply, a voltage adjustment circuit and a constant current source. The voltage adjustment circuit is used to adjust the DC voltage provided by the switching power supply, and then the adjusted DC voltage is applied to each LED, and the constant current source is used to keep the current flowing through each LED constant. The voltage adjustment circuit includes three step-down conversion sub-circuits, and the green LED, blue LED and red LED are respectively connected to one step-down conversion sub-circuit and three step-down conversion sub-circuits among the three step-down conversion sub-circuits. The driving voltages required to drive green LEDs, blue LEDs, and red LEDs are provided, respectively.

It can be seen that the power supply circuit in this patent has three step-down converter sub-circuits, which need to be equipped with three integrated chips. This greatly increases the component cost and manufacturing cost.

Utility model content

The technical problem to be solved by the present invention is to propose a new common cathode module of LED display screen based on the above-mentioned deficiencies of the prior art, which solves the problems of high component cost and high manufacturing cost.

The technical scheme of the present utility model is realized in this way:

A common cathode module of a new type of LED display screen includes a power supply, a step-down circuit, a red light drive circuit, a green light drive circuit, a blue light drive circuit, a red light group, a green light group, and a blue light group; The DC power supplies the green light driving circuit and the blue light driving circuit, and the green light driving circuit and the blue light driving circuit respectively supply power to the green light group and the blue light group; the power supply supplies the DC power to the step-down circuit, and the step-down circuit will The voltage of the direct current is adjusted and supplied to the red light drive circuit, which supplies power to the red light group.

Further, the voltage output end of the power supply is connected in parallel with the voltage input ends of the green light drive circuit, the blue light drive circuit and the step-down circuit; the voltage output ends of the green light drive circuit and the blue light drive circuit are respectively connected to the green light group, Blue light group, the voltage output end of the step-down circuit is connected to the red light drive circuit and the red light group in turn.

Further, the power supply converts the 220V/50HZ alternating current input from the external power grid into the direct current of 3.8V, and the step-down circuit adjusts the direct current of 3.8V to the direct current of 2.8V.

Further, the step-down circuit is arranged on the adapter board or the display light board of the LED display screen.

Further, the step-down circuit includes a step-down integrated chip U, an inductor L and a capacitor C1; the voltage input end of the step-down integrated chip U is connected to the voltage output end of the power supply circuit, and the voltage of the step-down integrated chip U is connected. The output end is connected in series with the inductor L, the other end of the inductor L is connected in parallel with the capacitor C1 and the voltage input end of the red light driving circuit, and the other end of the capacitor C1 is grounded.

Further, the step-down circuit further includes a resistor R1, and the resistor R1 is connected in series between the voltage output end of the power supply circuit and the open-drain logic output end of the step-down integrated chip U.

Further, the step-down circuit also includes a resistor R2 and a capacitor C2; one end of the resistor R2 and the capacitor C2 is connected in parallel with the voltage input end of the power supply circuit, and the other end of the resistor R2 is connected to the step-down integrated chip. The enable end of U is connected, and the other end of the C2 is grounded.

Further, the step-down circuit further includes an output feedback sub-circuit, and the output feedback sub-circuit includes a resistor R3 and a resistor R4; the voltage input end of the resistor R3 is connected to the voltage output end of the inductor L, The voltage output terminal of the resistor R4 is grounded, and the voltage output terminal of the resistor R3 and the voltage input terminal of the resistor R4 are connected in parallel with the voltage feedback terminal of the step-down integrated chip U.

By adopting the above technical scheme, the beneficial effect of the present utility model is that: the power supply directly supplies power to the green light driving circuit and the blue light driving circuit, and then the voltage of the power supply is reduced through the step-down circuit and supplies power to the red light driving circuit, so that R can be achieved. , GB separate power supply, accurate distribution of voltage and current to the red, green and blue light groups, only need to be equipped with a step-down integrated chip U, to achieve a common cathode cold screen, reducing the cost of components and production costs.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a circuit block diagram of an embodiment.

FIG. 2 is a circuit diagram of a step-down circuit in an embodiment.

In the figure, 10- power supply, 20- step-down circuit, 30- red light drive circuit, 40- green light drive circuit, 50- blue light drive circuit, 31- red light group, 41- green light group, 51- blue light group .

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in FIG. 1, in the embodiment provided by the present invention, a common cathode module of a novel LED display screen includes a power supply 10, a step-down circuit 20, a red light driving circuit 30, a green light driving circuit 40, a blue light The drive circuit 50, the red light group 31, the green light group 41, and the blue light group 51; the power supply 10 supplies DC power to the green light drive circuit 40 and the blue light drive circuit 50, and the green light drive circuit 40 and the blue light drive circuit 50 respectively supply power to the green light Group 41, blue light group 51; the power supply 10 supplies DC power to the step-down circuit 20, the step-down circuit 20 adjusts the voltage of the DC power and supplies power to the red light drive circuit 30, and the red light drive circuit 30 supplies power to the red light group 31.

The voltage output terminal of the power supply 10 is connected in parallel with the voltage input terminals of the green light driving circuit 40, the blue light driving circuit 50 and the step-down circuit 20; the voltage output terminals of the green light driving circuit 40 and the blue light driving circuit 50 are respectively connected to the green light group 41 and the blue light In group 51 , the voltage output terminal of the step-down circuit 20 is connected to the red light driving circuit 30 and the red light group 31 in sequence.

Specifically, the power supply 10 converts the 220V/50HZ alternating current input from the external grid into 3.8V direct current, and the step-down circuit 20 adjusts the 3.8V direct current to 2.8V direct current.

The step-down circuit 20 is arranged on the adapter board or the display light board of the LED display screen. Wherein, in this embodiment, the step-down circuit 20 is preferably arranged on the display light board of the LED display screen.

As shown in FIG. 2 , the step-down circuit 20 includes a step-down integrated chip U, an inductor L and a capacitor C1; the voltage input end of the step-down integrated chip U is connected to the voltage output end RC of the power supply circuit, and the The voltage output end is connected in series with the inductor L, the other end of the inductor L is connected in parallel with the capacitor C1 and the voltage input end DC of the red light driving circuit 30, and the other end of the capacitor C1 is grounded. Wherein, the number of capacitors C1 can be multiple, and the capacitance values are different.

The step-down circuit 20 further includes a resistor R1, which is connected in series between the voltage output end of the power supply circuit and the open-drain logic output end of the step-down integrated chip U.

The step-down circuit 20 also includes a resistor R2 and a capacitor C2; one end of the resistor R2 and the capacitor C2 is connected in parallel with the voltage input end of the power supply circuit, the other end of the resistor R2 is connected to the enabling end of the step-down integrated chip U, and the other end of C2 is grounded Wire. Wherein, the number of capacitors C2 can be multiple, and the capacitance values are different.

The step-down circuit 20 also includes an output feedback sub-circuit, which includes a resistor R3 and a resistor R4; the voltage input end of the resistor R3 is connected to the voltage output end of the inductor L, the voltage output end of the resistor R4 is grounded, and the resistor R3 The voltage output end of the resistor R4 and the voltage input end of the resistor R4 are connected in parallel with the voltage feedback end of the step-down integrated chip U.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the within the scope of protection of the present invention.

Claims (8)

1. A common cathode module of a novel LED display screen includes a power supply, a step-down circuit, a red light drive circuit, a green light drive circuit, a blue light drive circuit, a red light group, a green light group, and a blue light group; it is characterized in that : the power supply supplies DC power to the green light drive circuit and the blue light drive circuit, and the green light drive circuit and the blue light drive circuit supply power to the green light group and the blue light group respectively; the power supply supplies the DC power to the step-down circuit, The step-down circuit adjusts the voltage of the direct current and supplies power to the red light driving circuit, and the red light driving circuit supplies power to the red light group. 2. The common cathode module of a novel LED display screen according to claim 1, wherein the voltage output terminal of the power supply is connected in parallel with the voltage input terminals of the green light driving circuit, the blue light driving circuit and the step-down circuit; The voltage output terminals of the green light driving circuit and the blue light driving circuit are respectively connected to the green light group and the blue light group, and the voltage output terminals of the step-down circuit are connected to the red light driving circuit and the red light group in turn. 3. The common cathode module of a new type of LED display screen according to claim 1, wherein the power supply converts the 220V/50HZ alternating current input from the external power grid into the direct current of 3.8V, and the step-down circuit converts the 3.8 The direct current of V is adjusted to the direct current of 2.8V. 4 . The common cathode module of a new type of LED display screen according to claim 1 , wherein the step-down circuit is arranged on the adapter board or the display lamp board of the LED display screen. 5 . 5. The common cathode module of a novel LED display screen according to claim 1, wherein the step-down circuit comprises a step-down integrated chip U, an inductor L and a capacitor C1; the step-down integrated chip U The voltage input terminal of the power supply circuit is connected to the voltage output terminal of the power supply circuit, the voltage output terminal of the step-down integrated chip U is connected in series with the inductor L, and the other end of the inductor L is connected in parallel with the capacitor C1 and the voltage input of the red light drive circuit end, the other end of the capacitor C1 is grounded. 6 . The common cathode module of a novel LED display screen according to claim 5 , wherein the step-down circuit further comprises a resistor R1 , the resistor R1 is connected in series with the voltage output end of the power supply circuit and the step-down integrated circuit. 7 . Between the open-drain logic outputs of chip U. 7. The common cathode module of a new type of LED display screen according to claim 5, wherein the step-down circuit further comprises a resistor R2 and a capacitor C2; one end of the resistor R2 and the capacitor C2 is connected to the power supply circuit The voltage input ends of the resistor R2 are connected in parallel, the other end of the resistor R2 is connected to the enabling end of the step-down integrated chip U, and the other end of the C2 is grounded. 8. The common cathode module of a novel LED display screen according to claim 5, wherein the step-down circuit further comprises an output feedback sub-circuit, and the output feedback sub-circuit comprises a resistor R3 and a resistor R4; The voltage input terminal of the resistor R3 is connected to the voltage output terminal of the inductor L, the voltage output terminal of the resistor R4 is grounded, and the voltage output terminal of the resistor R3 and the voltage input terminal of the resistor R4 are connected in parallel with the step-down integrated circuit. The voltage feedback terminal of chip U.

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