CN112382232B - LED driving device and LED display screen - Google Patents
LED driving device and LED display screen Download PDFInfo
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- CN112382232B CN112382232B CN202011348880.3A CN202011348880A CN112382232B CN 112382232 B CN112382232 B CN 112382232B CN 202011348880 A CN202011348880 A CN 202011348880A CN 112382232 B CN112382232 B CN 112382232B
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- 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]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The invention discloses an LED driving device and an LED display screen, wherein the LED driving device comprises: the device comprises a driving circuit, an energy storage return power circuit, a charging circuit and an inverter; wherein: the input end of the inverter is connected with a control signal end, and the output end of the inverter is respectively connected with the driving circuit and the charging circuit to control and drive the driving circuit and the charging circuit to be switched on and/or switched off; and the driving circuit is respectively connected with the energy storage return power circuit, the charging circuit and the reverser and outputs and drives the LED. According to the embodiment of the invention, zero switching loss and zero conduction loss can be realized, the efficiency of driving the LED by the display screen is improved, and the temperature of the LED display screen is reduced.
Description
Technical Field
The invention relates to the field of LED display, in particular to an LED driving device and an LED display screen.
Background
LEDs (Light Emitting diodes) are widely used in display screens.
At present, a constant current driving circuit is generally adopted for driving an LED of an LED display screen, and relatively large loss (including switching loss and conduction loss) exists in the constant current driving circuit, wherein the switching loss is generated by a main driving circuit (If and Q1) in the two stages of opening and closing the main driving circuit under the action of an OE signal, and the conduction loss is generated by the main driving circuit after the main driving circuit is conducted. The above loss is particularly prominent in the case where a large number of driver ICs are required in a small-pitch LED display panel.
Disclosure of Invention
In view of this, the LED driving device and the LED display screen provided in the embodiments of the present invention can achieve zero switching loss and zero conduction loss, improve the efficiency of driving the LED by the display screen, and reduce the temperature of the LED display screen.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to an aspect of an embodiment of the present invention, there is provided an LED driving apparatus including: the energy storage device comprises a driving circuit, an energy storage return power circuit, a charging circuit and an inverter; wherein:
the input end of the inverter is connected with a control signal end, and the output end of the inverter is respectively connected with the driving circuit and the charging circuit to control and drive the driving circuit and the charging circuit to be switched on and/or switched off;
and the driving circuit is respectively connected with the energy storage return power supply circuit, the charging circuit and the reverser and outputs and drives the LED.
In a possible design, an input end of the charging circuit is connected with a first direct current power supply end VDD, an input end of the other end of the charging circuit is connected with an output end of the inverter, and an output end of the charging circuit is connected with the driving circuit and used for charging the driving circuit when the driving circuit is turned off under the output control of the inverter.
In one possible design, the charging circuit includes a P-type MOS transistor and a resistor, the source of the P-type MOS transistor is connected to the first dc power supply VDD, the drain of the P-type MOS transistor is connected to the resistor R1, and the gate of the P-type MOS transistor is connected to the output terminal of the inverter.
In a possible design, one end of the energy storage return power supply circuit is connected with a second direct current power supply end VCC, and the other end of the energy storage return power supply circuit is connected with the driving circuit and used for storing energy when the driving circuit is started, and releasing the stored energy to return to the second direct current power supply VCC when the driving circuit is turned off.
In one possible design, the energy storage return power supply circuit includes a diode and a capacitor, an input end of the diode is connected with the capacitor, and an output end of the diode is connected with the second direct current power supply terminal VCC.
In one possible design, the driving circuit is connected to the second dc power source VCC, the energy storage return power source circuit, the charging circuit, and the inverter, respectively, and is configured to output and drive the LED under the output control of the inverter and the energy storage return power source circuit.
In one possible design, the driving circuit comprises an inductor, a capacitor and an N-type MOS transistor, a gate of the N-type MOS transistor is connected with the output end of the inverter, a source of the N-type MOS transistor is grounded, and a drain of the N-type MOS transistor is respectively connected with the resistor and the capacitor; and one end of the inductor is connected with the capacitor, and the other end of the inductor is connected with the LED and then is connected with a second direct current power supply end VCC.
According to another aspect of the embodiment of the invention, an LED display screen is provided, which includes a plurality of LED driving devices and a plurality of LEDs, wherein the LED driving devices are connected to the LEDs and are configured to output and drive the LEDs.
Compared with the related art, the LED driving device and the LED display screen provided by the embodiment of the invention comprise: the energy storage device comprises a driving circuit, an energy storage return power circuit, a charging circuit and an inverter; wherein: the input end of the inverter is connected with a control signal end, and the output end of the inverter is respectively connected with the driving circuit and the charging circuit to control and drive the driving circuit and the charging circuit to be switched on and/or switched off; and the driving circuit is respectively connected with the energy storage return power supply circuit, the charging circuit and the reverser and outputs and drives the LED. According to the embodiment of the invention, the drive circuit is switched on and the charging circuit is switched off under the output control of the inverter, so that zero switching-on loss is realized; after the drive circuit is switched on, zero conduction loss is realized; the energy storage return power supply circuit stores energy when the driving circuit is started, and turns off the driving circuit after the energy storage is finished, so that zero turn-off loss is realized. Therefore, zero switching loss and zero conduction loss are realized, the efficiency of driving the LED by the display screen is improved, and the temperature of the LED display screen is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an LED driving apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of an LED driving apparatus according to an embodiment of the present invention.
Fig. 3 is a timing waveform diagram of an LED driving apparatus according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a path for energy stored in a capacitor C1 of an LED driving apparatus to return to a second dc power VCC according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an LED display screen according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In one embodiment, as shown in fig. 1, the present invention provides an LED driving apparatus 100, including: a drive circuit 10, an energy storage return power supply circuit 20, a charging circuit 30, and an inverter 40; wherein:
the input end of the inverter 40 is connected to the control signal end, and the output end is connected to the driving circuit 10 and the charging circuit 30, respectively, to control and drive the driving circuit 10 and the charging circuit 30 to be turned on and/or turned off.
The driving circuit 10 is connected to the energy storage return power circuit 20, the charging circuit 30, and the inverter 40, respectively, and outputs driving power to the LEDs.
In this embodiment, zero turn-on loss is realized by turning on the driving circuit and turning off the charging circuit under the control of the inverter output; after the drive circuit is switched on, zero conduction loss is realized; the energy storage return power supply circuit stores energy when the driving circuit is started, and turns off the driving circuit after the energy storage is finished, so that zero turn-off loss is realized. Therefore, zero switching loss and zero conduction loss are realized, the efficiency of driving the LED by the display screen is improved, and the temperature of the LED display screen is reduced.
In one embodiment, as shown in fig. 2, an input end of the charging circuit 30 is connected to a first dc power source VDD, another input end is connected to an output end of the inverter 40, and an output end is connected to the driving circuit 10, for charging the driving circuit 10 when the driving circuit 10 is turned off under the output control of the inverter 40.
In one embodiment, as shown in fig. 2, one end of the energy storage and return power circuit 20 is connected to the second dc power source terminal VCC, and the other end is connected to the driving circuit 10, and is configured to store energy when the driving circuit 10 is turned on, and release the stored energy to return to the second dc power source VCC when the driving circuit 10 is turned off.
In one embodiment, as shown in fig. 2, the driving circuit 10 is respectively connected to the second dc power source terminal VCC, the energy storage return power source circuit 20, the charging circuit 30, and the inverter 40, and is configured to output and drive the LED under the control of the outputs of the inverter 40 and the energy storage return power source circuit 20.
In one embodiment, as shown in fig. 2, the input terminal of the inverter 40 is connected to the control signal terminal OE, and the control signal terminal OE is active low.
In one embodiment, as shown in fig. 2, the charging circuit 30 includes a P-type MOS transistor Q2 and a resistor R1, wherein a source of the P-type MOS transistor Q2 is connected to a first dc power source VDD, a drain of the P-type MOS transistor Q1 is connected to the resistor R1, and a gate of the P-type MOS transistor Q2 is connected to the output terminal of the inverter 40.
In one embodiment, as shown in fig. 2, the tank-back power circuit 20 includes a diode D1 and a capacitor C1, wherein an input terminal of the diode D1 is connected to the capacitor C1, and an output terminal thereof is connected to the second dc power terminal VCC.
In one embodiment, as shown in fig. 2, the driving circuit 10 includes an inductor L1, a capacitor C1, and an N-type MOS transistor Q1, a gate of the N-type MOS transistor Q1 is connected to the output terminal of the inverter 40, a source is grounded, and a drain is connected to the resistor R1 and the capacitor C1, respectively; and one end of the inductor L1 is connected with the capacitor C1, and the other end of the inductor L1 is connected with a second direct current power supply end VCC after being connected with the LED.
Preferably, the output voltages of the first dc power supply VDD and the second dc power supply VCC are the same.
When the LED driving device provided by the invention works, the working process is as follows:
under the control of the control signal OE, the N-type MOS transistor Q1 operates with the voltage and current timing sequence, as shown in fig. 3. Vds is a voltage from the drain to the source of the N-type MOS transistor Q1, Ids is a current from the drain to the source, T1 is an on-period of the N-type MOS transistor Q1, Ton is an on-period of the N-type MOS transistor Q1, and T2 is an off-period of the N-type MOS transistor Q1.
When the N-type MOS transistor Q1 is driven to be turned on (time period T1), the P-type MOS transistor Q2 is turned off. The N-type MOS tube Q1 has a starting process and cannot be immediately and completely conducted, and because the current of the inductor L1 cannot be in transient change, the current Ids of the circuit at the stage is almost zero, and zero starting loss is realized.
After the driving N-type MOS transistor Q1 is completely turned on (time period Ton), since the on-resistance is very small and Vds is almost 0 after the N-type MOS transistor Q1 is turned on, zero conduction loss at the conduction stage is realized.
When the capacitor C1 is fully charged, the conduction is completed, the circuit current Ids is reduced to 0, and the N-type MOS transistor Q1 is turned off after the current Ids is 0 (time period T2), thereby realizing zero turn-off loss.
When the N-type MOS transistor Q1 is turned off, the P-type MOS transistor Q2 is turned on at the same time, the first dc power supply VDD charges the drain distributed capacitor C0 of the N-type MOS transistor Q1 through the P-type MOS transistor Q2 and the resistor R1, the voltage of the first dc power supply VDD is the same as that of the second dc power supply VCC, then the stored energy of the capacitor C1 returns to the second dc power supply VCC through the diode D1, and the stored energy of the capacitor C1 is almost reduced to 0. As shown in fig. 4, the energy stored in the capacitor C1 is discharged to the second dc power VCC path by the dotted arrow.
In one embodiment, as shown in fig. 5, the present invention provides an LED display screen, which includes a plurality of LED driving devices 100 and a plurality of LEDs 200, wherein the LED driving devices 100 are connected to the LEDs 200 for driving the LEDs 200.
The LED driving apparatus includes: a drive circuit 10, an energy storage return power supply circuit 20, a charging circuit 30, and an inverter 40; wherein:
the input end of the inverter 40 is connected to the control signal end, and the output end is connected to the driving circuit 10 and the charging circuit 30, respectively, to control and drive the driving circuit 10 and the charging circuit 30 to be turned on and/or turned off.
The driving circuit 10 is connected to the energy storage return power circuit 20, the charging circuit 30, and the inverter 40, respectively, and outputs driving power to the LEDs.
In this embodiment, zero turn-on loss is realized by turning on the driving circuit and turning off the charging circuit under the control of the inverter output; after the drive circuit is switched on, zero conduction loss is realized; the energy storage return power supply circuit stores energy when the driving circuit is started, and turns off the driving circuit after the energy storage is finished, so that zero turn-off loss is realized. Therefore, zero switching loss and zero conduction loss are realized, the efficiency of driving the LED by the display screen is improved, and the temperature of the LED display screen is reduced.
As shown in fig. 2, an input end of the charging circuit 30 is connected to a first dc power supply VDD, an input end of the other end of the charging circuit is connected to an output end of the inverter 40, and an output end of the charging circuit is connected to the driving circuit 10, so as to charge the driving circuit 10 when the driving circuit 10 is turned off under the output control of the inverter 40.
One end of the energy storage return power supply circuit 20 is connected with a second direct current power supply end VCC, and the other end is connected with the driving circuit 10, and is used for storing energy when the driving circuit 10 is turned on and releasing the energy storage to return to the second direct current power supply VCC when the driving circuit 10 is turned off.
The driving circuit 10 is respectively connected to the second dc power source terminal VCC, the energy storage return power source circuit 20, the charging circuit 30, and the inverter 40, and is configured to output and drive the LED under the output control of the inverter 40 and the energy storage return power source circuit 20.
The input of the inverter 40 is connected to a control signal terminal OE, which is active low.
The charging circuit 30 includes a P-type MOS transistor Q2 and a resistor R1, the source of the P-type MOS transistor Q2 is connected to a first dc power source VDD, the drain is connected to the resistor R1, and the gate is connected to the output of the inverter 40.
The energy storage return power supply circuit 20 comprises a diode D1 and a capacitor C1, wherein the input end of the diode D1 is connected with the capacitor C1, and the output end of the diode D1 is connected with a second direct current power supply end VCC.
The driving circuit 10 includes an inductor L1, a capacitor C1, and an N-type MOS transistor Q1, a gate of the N-type MOS transistor Q1 is connected to the output terminal of the inverter 40, a source is grounded, and a drain is connected to the resistor R1 and the capacitor C1, respectively; and one end of the inductor L1 is connected with the capacitor C1, and the other end of the inductor L1 is connected with a second direct current power supply end VCC after being connected with the LED.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the methods according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. An LED driving apparatus, comprising: the energy storage device comprises a driving circuit, an energy storage return power circuit, a charging circuit and an inverter; wherein:
the input end of the inverter is connected with a control signal end, and the output end of the inverter is respectively connected with the driving circuit and the charging circuit to control and drive the driving circuit and the charging circuit to be switched on and/or switched off;
the driving circuit comprises an inductor, a capacitor C1 and an N-type MOS (metal oxide semiconductor) tube, and is respectively connected with the energy storage return power circuit, the charging circuit and the reverser to output and drive the LED.
2. The LED driving apparatus according to claim 1, wherein the charging circuit has an input terminal connected to a first dc power supply terminal VDD, another input terminal connected to an output terminal of the inverter, and an output terminal connected to the driving circuit, and is configured to charge the driving circuit when the driving circuit is turned off under the output control of the inverter.
3. The LED driving apparatus according to claim 2, wherein the charging circuit includes a P-type MOS transistor and a resistor, the P-type MOS transistor has a source connected to the first dc power source VDD, a drain connected to the resistor, and a gate connected to the output terminal of the inverter.
4. The LED driving apparatus according to claim 1, wherein one end of the energy storage and return power circuit is connected to a second DC power source terminal VCC, and the other end is connected to the driving circuit, for storing energy when the driving circuit is turned on, and releasing the stored energy to return to the second DC power source VCC when the driving circuit is turned off.
5. The LED driving apparatus according to claim 4, wherein the energy-storage return power circuit comprises a diode and the capacitor C1, wherein an input terminal of the diode is connected to the capacitor C1, and an output terminal of the diode is connected to the second DC power supply terminal VCC.
6. The LED driving apparatus according to claim 3, wherein the driving circuit is connected to a second dc power source terminal VCC, the energy storage return power source circuit, the charging circuit, and the inverter, respectively, for driving the LED by output under the control of the output of the inverter and the energy storage return power source circuit.
7. The LED driving apparatus according to claim 6, wherein the gate of the N-type MOS transistor is connected to the output terminal of the inverter, the source is grounded, and the drain is respectively connected to the resistor and the capacitor C1; and one end of the inductor is connected with the capacitor C1, and the other end of the inductor is connected with the LED and then is connected with a second direct current power supply end VCC.
8. An LED display screen, characterized in that, the LED display screen comprises a plurality of LED driving devices as claimed in any one of claims 1 to 7 and a plurality of LEDs, the LED driving devices are connected with the LEDs for driving the LEDs by output.
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