CN217386636U

CN217386636U - LED drive circuit

Info

Publication number: CN217386636U
Application number: CN202123367332.8U
Authority: CN
Inventors: 朱志强; 林训杰
Original assignee: Fujian Qiangli Photoelectricity Co Ltd
Current assignee: Fujian Qiangli Photoelectricity Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-09-06
Anticipated expiration: 2031-12-29

Abstract

The utility model provides a LED drive circuit, include: an LED module; the column driving unit is connected to the anode of the LED module and connected to the power supply; the row driving unit is connected to the cathode of the LED module; and the input end of the voltage conversion module is connected to the power supply, and the output end of the voltage conversion module is respectively connected to the column driving unit and the row driving unit. The utility model discloses structural design is ingenious, has satisfied different emitting diode's voltage demand through the combination of power and voltage conversion module, and has reduced power output voltage to reduce consumption and product cost, promoted the performance of LED display screen.

Description

LED drive circuit

Technical Field

The utility model relates to a LED display screen field, more specifically the saying so relates to a LED drive circuit.

Background

The LED has the advantages of low voltage, energy conservation, long service life and the like, and is widely applied in various fields at present. In recent years, the development of LED display screens is rapid, the technical difficulty is continuously upgraded from the initial large-space and low-definition development to the current small-space and ultra-high-definition indoor high-end display, the requirement on energy consumption is higher and higher, and therefore, the energy-saving scheme is more and more emphasized. In the prior art, when 3.8V voltage is used for supplying power to an LED module, the voltage is applied to circuits of a red lamp, a green lamp and a blue lamp, and the working voltage of a red lamp tube and a red chip is about 2.8V; green/blue fluorescent tube, the working voltage of green/blue chip is about 3.8V, wherein the conduction voltage of red light is lower, in red light circuit, the voltage among the red light driver IC is higher, the voltage drop among the red light driver IC is higher, and driver IC's calorific capacity becomes positive correlation rather than the voltage drop, make whole LED circuit produce very high heat, make LED display screen consumption high, and the display effect worsens because of the influence that the temperature rose, the heat dissipation design of display screen need drop into very high cost, can not reach real energy-conserving effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a LED drive circuit.

The utility model discloses it reduces the consumption and the reduction in production cost of LED display screen to solve.

Compared with the prior art, the utility model discloses technical scheme and beneficial effect as follows:

an LED driver circuit comprising: an LED module; the column driving unit is connected to the anode of the LED module and is connected to a power supply; the row driving unit is connected to the cathode of the LED module; and the input end of the voltage conversion module is connected to the power supply, and the output end of the voltage conversion module is respectively connected to the column driving unit and the row driving unit.

As a further improvement, the LED module comprises more than one first light emitting diode, more than one second light emitting diode and more than one third light emitting diode; the column driving unit includes: a first column of driver chips connected between the power supply and the anode of the first light emitting diode; the second row of driving chips are connected between the output end of the voltage conversion module and the anode of the second light-emitting diode; and the third row of driving chips are connected between the output end of the voltage conversion module and the anode of the third light-emitting diode.

As a further improvement, the display device further comprises a control module, wherein the control module is connected between the output end of the voltage conversion module and the row driving unit, and sends a row driving signal to the row driving unit; the control module is connected to the first row of driving chips and sends a first driving signal to the first row of driving chips; the control module is connected to the second row of driving chips and sends a second driving signal to the second row of driving chips; the control module is connected to the third row of driver chips and sends a third driving signal to the third row of driver chips.

As a further improvement, the voltage conversion module comprises: a voltage conversion circuit; the output end of the feedback module is connected to the voltage conversion circuit, and the first input end of the feedback module is connected to the power supply; and the input end of the rectifying and filtering module is connected to the output end of the voltage conversion circuit, the first output end of the rectifying and filtering module is connected to the second input end of the feedback module, and the second output end of the rectifying and filtering module is respectively connected to the column driving unit and the row driving unit.

As a further improvement, the first light emitting diode is a red light emitting diode, the second light emitting diode is a green light emitting diode, and the third light emitting diode is a blue light emitting diode.

As a further improvement, the input voltage of the voltage conversion module is a first voltage, and the conversion output voltage of the voltage conversion module is a second voltage, and the second voltage is higher than the first voltage.

The beneficial effects of the utility model are that: the LED module, the column driving unit, the row driving unit, the voltage conversion module and the control module are combined, so that the power supply of the LEDs with different working voltages is realized through the voltage conversion module, and the voltage requirements of different LEDs can be met only by one power supply; the utility model discloses a drive circuit's structure is more reasonable, is applicable to the LED module of different lamp pearl quantity, and voltage conversion module includes voltage conversion circuit, rectification filter module and feedback module, has not only reduced the output voltage of power and drive IC's calorific capacity, and has reduced the cost of drop circuit design to the performance of LED display screen has been promoted.

Drawings

Fig. 1 is a schematic diagram of an LED driving circuit according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a voltage conversion module according to an embodiment of the present invention.

In the figure:

LED module 2, row driving unit 21, first row driving chip

22. Second column driver chip 23, third column driver chip 3, row driver unit

4. Voltage conversion module 41, voltage conversion circuit 42 and feedback module

43. Rectifier filter module 5, power supply 6 and control module

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 2, an LED driving circuit includes: an LED module 1; the column driving unit 2 is connected to the anode of the LED module 1, and the column driving unit 2 is connected to a power supply 5; the row driving unit 3 is connected to the cathode of the LED module 1; and an input end of the voltage conversion module 4 is connected to the power supply 5, and an output end of the voltage conversion module 4 is respectively connected to the column driving unit 2 and the row driving unit 3.

The LED module 1 comprises more than one first light-emitting diode, more than one second light-emitting diode and more than one third light-emitting diode; the column driving unit 2 includes: a first column of driver chips 21, the first column of driver chips 21 being connected between the power supply 5 and the anodes of the first light emitting diodes; the second column of driving chips 22, the second column of driving chips 22 being connected between the output end of the voltage conversion module 4 and the anode of the second light emitting diode; and a third column of driver chips 23, wherein the third column of driver chips 23 is connected between the output end of the voltage conversion module 4 and the anode of the third light emitting diode.

The LED driving circuit further comprises a control module 6, wherein the control module 6 is connected between the output end of the voltage conversion module 4 and the row driving unit 3, and the control module 6 sends a row driving signal to the row driving unit 3; the control module 6 is connected to the first row of driving chips 21, and the control module 6 sends a first driving signal to the first row of driving chips 21; the control module 6 is connected to the second row of driving chips 22, and the control module 6 sends a second driving signal to the second row of driving chips 22; the control module 6 is connected to the third row of driver chips 23, and the control module 6 sends a third driving signal to the third row of driver chips 23.

Wherein, the row driving unit 3 is a row driving chip; the first row driving chip 21, the second row driving chip 22 and the third row driving chip 23 are a red row driving chip, a green row driving chip and a blue row driving chip respectively; the first driving signal, the second driving signal and the third driving signal are respectively a red driving signal, a green driving signal and a blue driving signal.

The voltage conversion module 4 includes: a voltage conversion circuit 41; a feedback module 42, an output end of the feedback module 42 is connected to the voltage converting circuit 41, and a first input end of the feedback module 42 is connected to the power supply 5; an input end of the rectifying and filtering module 43 is connected to the output end of the voltage converting circuit 41, a first output end of the rectifying and filtering module 43 is connected to a second input end of the feedback module 42, and second output ends of the rectifying and filtering module 43 are respectively connected to the column driving unit 2 and the row driving unit 3.

The first light emitting diode is a red light emitting diode, the second light emitting diode is a green light emitting diode, and the third light emitting diode is a blue light emitting diode.

The input voltage of the voltage conversion module 4 is a first voltage, and the conversion output voltage of the voltage conversion module 4 is a second voltage, and the second voltage is higher than the first voltage. In this embodiment, the first voltage is 2.8V, and the second voltage is 3.8V.

The LED module 1, the column driving unit 2, the row driving unit 3, the voltage conversion module 4 and the control module 6 are combined, so that the power supply of the LEDs with different working voltages through the voltage conversion module 4 is realized, and the voltage requirements of different LEDs can be met only by one power supply 5; the utility model discloses a drive circuit's structure is more reasonable, is applicable to the LED module 1 of different lamp pearl quantity, and voltage conversion module 4 includes voltage conversion circuit 41, rectification filter module 43 and feedback module 42, has not only reduced the output voltage of power and drive IC's calorific capacity, and has reduced the cost of pressure drop circuit design to the performance of LED display screen has been promoted.

The above examples are only used to illustrate the technical solution of the present invention and not to limit it. It will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the true spirit and scope of the invention as defined in the appended claims.

Claims

1. An LED driving circuit, comprising:

an LED module;

the column driving unit is connected to the anode of the LED module and is connected to a power supply;

the row driving unit is connected to the cathode of the LED module;

and the input end of the voltage conversion module is connected to the power supply, and the output end of the voltage conversion module is respectively connected to the column driving unit and the row driving unit.

2. The LED driving circuit according to claim 1, wherein the LED module comprises more than one first LED, more than one second LED and more than one third LED; the column driving unit includes:

a first column of driver chips connected between the power supply and the anode of the first light emitting diode;

the second row of driving chips are connected between the output end of the voltage conversion module and the anode of the second light-emitting diode;

and the third column of driving chips are connected between the output end of the voltage conversion module and the anode of the third light-emitting diode.

3. The LED driving circuit according to claim 2, further comprising a control module, connected between the output terminal of the voltage converting module and the row driving unit, the control module sending a row driving signal to the row driving unit;

the control module is connected to the first row of driving chips and sends a first driving signal to the first row of driving chips;

the control module is connected to the second row of driving chips and sends a second driving signal to the second row of driving chips;

the control module is connected to the third row of driver chips and sends a third driving signal to the third row of driver chips.

4. The LED driving circuit according to claim 1, wherein the voltage converting module comprises:

a voltage conversion circuit;

the output end of the feedback module is connected to the voltage conversion circuit, and the first input end of the feedback module is connected to the power supply;

and the input end of the rectifying and filtering module is connected to the output end of the voltage conversion circuit, the first output end of the rectifying and filtering module is connected to the second input end of the feedback module, and the second output end of the rectifying and filtering module is respectively connected to the column driving unit and the row driving unit.

5. The LED driving circuit according to claim 2, wherein the first LED is a red LED, the second LED is a green LED, and the third LED is a blue LED.

6. The LED driving circuit as claimed in claim 1, wherein the input voltage of the voltage converting module is a first voltage, and the converted output voltage of the voltage converting module is a second voltage, and the second voltage is higher than the first voltage.