CN112423435A - LED drive circuit and LED display screen - Google Patents

LED drive circuit and LED display screen Download PDF

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Publication number
CN112423435A
CN112423435A CN202011270086.1A CN202011270086A CN112423435A CN 112423435 A CN112423435 A CN 112423435A CN 202011270086 A CN202011270086 A CN 202011270086A CN 112423435 A CN112423435 A CN 112423435A
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CN
China
Prior art keywords
led
constant current
voltage
module
current driving
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Pending
Application number
CN202011270086.1A
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Chinese (zh)
Inventor
徐惠能
洪荣辉
林阳腾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujian Qiangli Photoelectricity Co Ltd
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Fujian Qiangli Photoelectricity Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Fujian Qiangli Photoelectricity Co Ltd filed Critical Fujian Qiangli Photoelectricity Co Ltd
Priority to CN202011270086.1A priority Critical patent/CN112423435A/en
Publication of CN112423435A publication Critical patent/CN112423435A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]

Abstract

The invention relates to the technical field of LEDs, and provides an LED driving circuit and an LED display screen. An LED driver circuit comprising: an LED module; the row driving unit is connected between a power supply and the anode of the LED module; the constant current driving unit is connected between the negative electrode of the LED module and a reference ground; and the voltage conversion module is connected between the constant current driving unit and a reference ground. The LED driving circuit can supply power to different types of LEDs through the voltage conversion module, can meet the requirements of the LEDs with different voltages by only one power supply, has a reasonable structure and stronger expansibility, reduces the heating value of the driving IC and the cost of the design of the voltage drop circuit, and has wide market application prospect.

Description

LED drive circuit and LED display screen
Technical Field
The invention relates to the technical field of LEDs, in particular to an LED driving circuit and an LED display screen.
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 LED display screen is rapidly developed, the technology difficulty is continuously upgraded from the initial large-space low-definition display to the current small-space ultrahigh-definition indoor high-end display, the requirement on energy consumption is higher and higher, and the energy-saving scheme is more and more emphasized. In the prior art, the conventional 4.5V/5V voltage that uses supplies power for the module, and driver IC's calorific capacity becomes positive correlation rather than the pressure drop for whole LED circuit produces very high heat, makes LED display screen consumption high, and the display effect is because of the influence variation that the temperature risees, and the heat dissipation design of display screen needs to drop into very high cost, can not reach real energy-conserving effect.
Disclosure of Invention
The invention aims to provide an LED driving circuit and an LED display screen.
The invention aims to reduce the power consumption of the LED display screen and the production cost.
Compared with the prior art, the technical scheme and the beneficial effects of the invention are as follows:
an LED driver circuit comprising: an LED module; the row driving unit is connected between a power supply and the anode of the LED module; the constant current driving unit is connected between the negative electrode of the LED module and a reference ground; and the voltage conversion module is connected between the constant current driving unit and a reference ground.
As a further improvement, the LED module includes: more than one first light emitting diode, more than one second light emitting diode and more than one third light emitting diode; the row driving unit includes: the first row of driving chips are connected between the anode of the first light-emitting diode and the power supply; the second row driving chip is connected between the anode of the second light-emitting diode and the power supply; and the third row driving chip is connected between the anode of the third light-emitting diode and the power supply.
As a further improvement, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground, the voltage conversion module is connected between the first constant current driving chip and the reference ground, and a power supply end of the voltage conversion module is connected with a power supply; the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; and the third constant current driving chip is connected between the cathode of the third light emitting diode and the reference ground.
As a further improvement, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground; the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; the third constant current driving chip is connected between the negative electrode of the third light emitting diode and the reference ground; the voltage conversion module is connected between the second constant current driving chip and a reference ground, the voltage conversion module is connected between the third constant current driving chip and the reference ground, and a power supply end of the voltage conversion module is connected with a power supply.
As a further improvement, the voltage conversion module includes: 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 rectification filter module is connected to the output end of the voltage conversion circuit, the first output end of the rectification filter module is connected to the second input end of the feedback module, and the second output end of the rectification filter module is grounded.
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 first voltage is higher than the second voltage.
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.
As a further improvement, the device further comprises a control module, wherein the control module is respectively connected with the row driving unit and the constant current driving unit; the control module is respectively connected with the first row of driving chips and the first constant current driving chip, the control module sends a first row signal to the first row of driving chips, and the control module sends a first driving signal to the first constant current driving chip; the control module is respectively connected to the second row driving chip and the second constant current driving chip, the control module sends a second row signal to the second row driving chip, and the control module sends a second driving signal to the second constant current driving chip; the control module is respectively connected to the third row of driving chips and the third constant current driving chip, the control module sends a third row signal to the third row of driving chips, and the control module sends a third driving signal to the third constant current driving chip.
An LED display screen, including LED drive circuit, still including: the packaging structure is used for packaging the LED driving circuit; and the control button is arranged on the packaging structure and is electrically connected with the LED driving circuit.
The invention has the beneficial effects that: according to the invention, the LED module, the line driving unit, the constant current driving unit and the voltage conversion module are combined, so that power supply for different types of light emitting diodes is realized through the voltage conversion module, and the requirements of the light emitting diodes with different voltages can be met by only one power supply; the driving control circuit is more reasonable in structure and suitable for expanding LED modules with different lamp bead quantities; the voltage conversion module comprises a voltage conversion circuit, a rectification filter module and a feedback module, so that the heat productivity of the driving IC is reduced, the cost of the design of the voltage drop circuit is reduced, and the performance of the LED display screen is improved.
Drawings
Fig. 1 is a circuit diagram of an LED driving circuit according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a voltage conversion module according to an embodiment of the invention.
Fig. 3 is a circuit diagram of an LED driving circuit according to a second embodiment of the present invention.
Fig. 4 is a circuit diagram of an LED driving circuit according to a third embodiment of the present invention.
Fig. 5 is a circuit diagram of an LED driving circuit according to a fourth embodiment of the present invention.
In the figure: 1, LED module 2/3/4/51/52, voltage conversion module 6, control module 7 and power supply
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
Referring to fig. 1 to 5, the LED driving circuit includes: an LED module 1; the row driving unit is connected between a power supply 7 and the anode of the LED module 1; the constant current driving unit is connected between the negative electrode of the LED module 1 and a reference ground; and the voltage conversion module is connected between the constant current driving unit and a reference ground. The LED driving circuit adopts the combination of the LED module 1, the line driving unit, the constant current driving unit and the voltage conversion module, realizes that different types of light emitting diodes are supplied with power through the voltage conversion module, and realizes that the requirements of the light emitting diodes with different voltages can be met only by one power supply 7; the driving control circuit is more reasonable in structure and suitable for expanding the LED modules 1 with different lamp bead quantities; the voltage conversion module comprises a voltage conversion circuit, a rectification filter module and a feedback module, so that the heat productivity of the driving IC is reduced, the cost of the design of the voltage drop circuit is reduced, and the performance of the LED display screen is improved.
Referring to fig. 1, 3, 4 and 5, the LED module 1 includes: more than one first light emitting diode, more than one second light emitting diode and more than one third light emitting diode; the row driving unit includes: the first row of driving chips are connected between the anode of the first light-emitting diode and the power supply 7; the second row driving chip is connected between the anode of the second light-emitting diode and the power supply 7; and the third row of driving chips are connected between the anode of the third light-emitting diode and the power supply 7.
In one embodiment, referring to fig. 1, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground, the voltage conversion module 2 is connected between the first constant current driving chip and the reference ground, and a power supply end of the voltage conversion module 2 is connected with a power supply 7; the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; and the third constant current driving chip is connected between the cathode of the third light emitting diode and the reference ground.
Referring to fig. 1 to 2, the voltage conversion module 2 includes: 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 7; and the input end of the rectification filter module is connected to the output end of the voltage conversion circuit, the first output end of the rectification filter module is connected to the second input end of the feedback module, and the second output end of the rectification filter module is grounded.
Referring to fig. 1 to 5, 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.
Referring to fig. 1, an input voltage of the voltage conversion module 2 is a first voltage, and a conversion output voltage of the voltage conversion module 2 is a second voltage, where the first voltage is higher than the second voltage. In the first embodiment, the first voltage is 3.8V, and the second voltage is 2.8V.
Referring to fig. 1, 3, 4 and 5, the LED driving circuit further includes a control module 6, and the control module 6 is respectively connected to the row driving unit and the constant current driving unit; the control module 6 is respectively connected to the first row driver chip and the first constant current driver chip, the control module 6 sends a first row signal to the first row driver chip, and the control module 6 sends a first driver signal to the first constant current driver chip; the control module 6 is respectively connected to the second row driving chip and the second constant current driving chip, the control module 6 sends a second row signal to the second row driving chip, and the control module 6 sends a second driving signal to the second constant current driving chip; the control module 6 is connected to the third row driver chip and the third constant current driver chip, respectively, the control module 6 sends a third row signal to the third row driver chip, and the control module 6 sends a third driver signal to the third constant current driver chip.
An LED display screen, including LED drive circuit, still including: the packaging structure is used for packaging the LED driving circuit; and the control button is arranged on the packaging structure and is electrically connected with the LED driving circuit.
In a second embodiment, referring to fig. 3, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and the voltage conversion module 4; the second constant current driving chip is connected between the cathode of the second light emitting diode and the voltage conversion module 4; the third constant current driving chip is connected between the cathode of the third light emitting diode and the voltage conversion module 4; the power end of the voltage conversion module 4 is connected with the power supply 7, and the ground end of the voltage conversion module 4 is connected with the reference ground.
Referring to fig. 3, 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 a third voltage respectively, where the second voltage is used for driving a red light emitting diode, and the third voltage is used for driving a green light emitting diode and a blue light emitting diode. The third voltage is higher than the second voltage. In example two, the second voltage is 2.5V and the third voltage is 3.5V.
In a third embodiment, referring to fig. 4, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground; the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; the third constant current driving chip is connected between the negative electrode of the third light emitting diode and the reference ground; one voltage conversion module 51 is connected between the second constant current driver chip and the reference ground, the other voltage conversion module 52 is connected between the third constant current driver chip and the reference ground, and a power supply end of the voltage conversion module 51/52 is connected to the power supply 7.
In a fourth embodiment, referring to fig. 5, the constant current driving unit includes: the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground; the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; the third constant current driving chip is connected between the negative electrode of the third light emitting diode and the reference ground; the voltage conversion module 3 is connected between the second constant current driving chip and a reference ground, the voltage conversion module 3 is connected between the third constant current driving chip and the reference ground, and a power supply end of the voltage conversion module 3 is connected with a power supply 7.
Referring to fig. 4 and 5, the input voltage of the voltage conversion module 3/51/52 is a first voltage, and the conversion output voltage of the voltage conversion module 3/51/52 is a second voltage, which is higher than the first voltage. In the third and fourth embodiments, the first voltage is 2.0V and the second voltage is 3.0V.
It should be noted that, referring to fig. 1, the power supply terminal of the second constant current driving unit and the power supply terminal of the third constant current driving unit are both connected to the power supply 7. Referring to fig. 4 and 5, the power source terminal of the first constant current driving unit is connected to the power source 7.
The working principle, working process and the like of the present embodiment can refer to the corresponding contents of the foregoing embodiments.
The same or similar parts in the above embodiments in this specification may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments, but the differences are not limited to be replaced or superimposed with each other.
The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that any modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims.

Claims (10)

  1. An LED driving circuit, comprising:
    an LED module;
    the row driving unit is connected between a power supply and the anode of the LED module;
    the constant current driving unit is connected between the negative electrode of the LED module and a reference ground;
    and the voltage conversion module is connected between the constant current driving unit and a reference ground.
  2. 2. The LED driving circuit according to claim 1, wherein 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 row driving unit includes:
    the first row of driving chips are connected between the anode of the first light-emitting diode and the power supply;
    the second row driving chip is connected between the anode of the second light-emitting diode and the power supply;
    and the third row driving chip is connected between the anode of the third light-emitting diode and the power supply.
  3. 3. The LED driving circuit according to claim 2, wherein the constant current driving unit includes:
    the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground, the voltage conversion module is connected between the first constant current driving chip and the reference ground, and a power supply end of the voltage conversion module is connected with a power supply;
    the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground;
    and the third constant current driving chip is connected between the cathode of the third light emitting diode and the reference ground.
  4. 4. The LED driving circuit according to claim 2, wherein the constant current driving unit includes:
    the first constant current driving chip is connected between the cathode of the first light emitting diode and a reference ground;
    the second constant current driving chip is connected between the cathode of the second light emitting diode and a reference ground; the third constant current driving chip is connected between the negative electrode of the third light emitting diode and the reference ground; the voltage conversion module is connected between the second constant current driving chip and a reference ground, the voltage conversion module is connected between the third constant current driving chip and the reference ground, and a power supply end of the voltage conversion module is connected with a power supply.
  5. 5. The LED driving circuit according to claim 3 or 4, wherein 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 rectification filter module is connected to the output end of the voltage conversion circuit, the first output end of the rectification filter module is connected to the second input end of the feedback module, and the second output end of the rectification filter module is grounded.
  6. 6. The LED driving circuit according to claim 2, 3 or 4, wherein the first LED is a red LED, the second LED is a green LED, and the third LED is a blue LED.
  7. 7. The LED driving circuit according to claim 3, wherein the input voltage of the voltage conversion module is a first voltage, the conversion output voltage of the voltage conversion module is a second voltage, and the first voltage is higher than the second voltage.
  8. 8. The LED driving circuit according to claim 4, wherein the input voltage of the voltage conversion module is a first voltage, and the converted output voltage of the voltage conversion module is a second voltage, and the second voltage is higher than the first voltage.
  9. 9. The LED driving circuit according to claim 1, further comprising a control module, wherein the control module is respectively connected to the row driving unit and the constant current driving unit;
    the control module is respectively connected with the first row of driving chips and the first constant current driving chip, the control module sends a first row signal to the first row of driving chips, and the control module sends a first driving signal to the first constant current driving chip;
    the control module is respectively connected to the second row driving chip and the second constant current driving chip, the control module sends a second row signal to the second row driving chip, and the control module sends a second driving signal to the second constant current driving chip;
    the control module is respectively connected to the third row of driving chips and the third constant current driving chip, the control module sends a third row signal to the third row of driving chips, and the control module sends a third driving signal to the third constant current driving chip.
  10. 10. An LED display panel, comprising the LED driving circuit according to any one of claims 1 to 9, further comprising: the packaging structure is used for packaging the LED driving circuit; and the control button is arranged on the packaging structure and is electrically connected with the LED driving circuit.
CN202011270086.1A 2020-11-13 2020-11-13 LED drive circuit and LED display screen Pending CN112423435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011270086.1A CN112423435A (en) 2020-11-13 2020-11-13 LED drive circuit and LED display screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011270086.1A CN112423435A (en) 2020-11-13 2020-11-13 LED drive circuit and LED display screen

Publications (1)

Publication Number Publication Date
CN112423435A true CN112423435A (en) 2021-02-26

Family

ID=74832214

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011270086.1A Pending CN112423435A (en) 2020-11-13 2020-11-13 LED drive circuit and LED display screen

Country Status (1)

Country Link
CN (1) CN112423435A (en)

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