CN110996457B - LED driving circuit, device, LED control protection method and storage medium - Google Patents
LED driving circuit, device, LED control protection method and storage medium Download PDFInfo
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- CN110996457B CN110996457B CN201911420455.8A CN201911420455A CN110996457B CN 110996457 B CN110996457 B CN 110996457B CN 201911420455 A CN201911420455 A CN 201911420455A CN 110996457 B CN110996457 B CN 110996457B
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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
- H05B44/00—Circuit arrangements for operating electroluminescent light sources
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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
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses an LED driving circuit, an LED driving device, an LED control protection method and a storage medium, wherein the circuit comprises a power supply module, an LED driving chip, a diode group and a control chip; the output end of the control chip is connected with the power supply module, the input end of the control chip is connected with the negative electrode of the diode group, and the control end of the control chip is connected with the LED driving chip; the anode of the diode group is connected with the power supply module, and the cathode of the diode group is connected with the LED driving chip; the control chip is used for detecting the output voltage of the diode group and adjusting the power supply voltage output by the power supply module according to the output voltage of the diode group. According to the invention, the output voltage of the diode group is detected to regulate the power supply voltage output by the power supply module, so that the over-high or over-low voltage on the LED driving chip is avoided, and the stability of the LED driving chip is ensured.
Description
Technical Field
The present invention relates to the field of LED driving technologies, and in particular, to an LED driving circuit, an LED driving device, an LED control protection method, and a storage medium.
Background
LEDs are short for light emitting diodes, and are acronyms for Light Emitting Diode. Is a semiconductor diode that converts electrical energy into light energy. The light emitting diode is composed of a PN junction and has unidirectional conductivity.
In the current LED linear constant current driving circuit in the market, in the actual use process, the voltage in the circuit cannot be fed back, so that when the voltage in the using circuit is lower, the voltage drop of an LED driving chip in the driving circuit is increased, the temperature of the LED driving chip is increased, and the reliability of the LED driving chip is influenced.
Disclosure of Invention
The invention mainly aims to provide an LED driving circuit, an LED driving device, an LED control protection method and a storage medium, and aims to solve the problem that the reliability of an LED driving chip is affected by the temperature rise of the LED driving chip caused by the unstable voltage of the driving circuit.
In order to achieve the above object, the present invention provides an LED driving circuit, including a power module, an LED driving chip, a diode group, and a control chip;
the output end of the control chip is connected with the power supply module, the input end of the control chip is connected with the negative electrode of the diode group, and the control end of the control chip is connected with the LED driving chip;
the anode of the diode group is connected with the power supply module, and the cathode of the diode group is connected with the LED driving chip;
the control chip is used for detecting the output voltage of the diode group and adjusting the power supply voltage output by the power supply module according to the output voltage of the diode group.
Optionally, the control chip is configured to raise a feedback voltage output to the power module when the output voltage of the diode group rises; when the output voltage of the diode group drops, the feedback voltage output to the power module is reduced;
the power supply module is used for reducing the output power supply voltage when the feedback voltage rises; and when the feedback voltage is reduced, the output power supply voltage is increased.
Optionally, the control chip is further configured to obtain a stable voltage of the diode group, and maintain the feedback voltage output to the power module when the output voltage of the diode group is consistent with the stable voltage.
Optionally, the diode group includes a plurality of series diode assemblies, and each series diode assembly is formed by connecting a plurality of diodes in series, and the positive pole of each series diode assembly with power module links to each other, and the negative pole with the interface that LED drive chip corresponds links to each other.
In addition, the invention also provides an LED control protection method which is applied to the LED driving circuit, and the LED control protection method comprises the following steps:
each series diode component in the detection diode group outputs an output voltage to the LED driving chip;
the power supply voltage of the power supply module is adjusted according to the output voltage of each series diode assembly.
Optionally, before the step of detecting the output voltage of each series diode component in the diode group to the LED driving chip, the method further includes:
controlling the power supply module to output a first power supply voltage, and detecting current and output voltage corresponding to each series diode component in the diode group in real time;
reducing the feedback voltage output to the power supply module to increase the power supply voltage output by the power supply module;
when the current of all the series diode assemblies is higher than the rated current, determining the power supply voltage output by the power supply module as a second power supply voltage, and determining the detected output voltage corresponding to each series diode assembly as a stable voltage;
when the diode group is started, the power supply module is controlled to output the second power supply
Optionally, the step of adjusting the power supply voltage of the power supply module according to the output voltage of each series diode assembly includes:
when the output voltage of each series diode component is increased, the feedback voltage output to the power module is increased so as to reduce the power voltage output by the power module, and the output voltage of each series diode component in the diode group is detected in real time;
when the output voltage corresponding to each serial diode component is stable voltage, maintaining the feedback voltage output to the power module
Optionally, the step of adjusting the power supply voltage of the power supply module according to the output voltage of each series diode assembly includes:
when the output voltage of each series diode component is reduced, reducing the feedback voltage output to the power module so as to improve the power voltage output by the power module, and detecting the output voltage of each series diode component in the diode group in real time;
when the output voltage corresponding to each serial diode component is stable voltage, maintaining the feedback voltage output to the power module
In addition, in order to achieve the above object, the present invention also provides an LED driving device including a memory, a processor, and an LED control protection program stored on the memory and executable on the processor, wherein: the LED control protection program, when executed by the processor, implements the steps of the LED control protection method as described above.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon an LED control protection program which, when executed by a processor, implements the steps of the LED control protection method as described above.
The embodiment of the invention provides an LED driving circuit, an LED driving device, an LED control protection method and a storage medium, wherein the LED driving circuit comprises a power supply module, an LED driving chip, a diode group and a control chip; the output end of the control chip is connected with the power supply module, the input end of the control chip is connected with the negative electrode of the diode group, and the control end of the control chip is connected with the LED driving chip; the anode of the diode group is connected with the power supply module, and the cathode of the diode group is connected with the LED driving chip. The invention obtains the optimal state of the voltage in the circuit through debugging, then detects the output voltage of the diode group in real time through the control chip, and adjusts the power supply voltage output by the power supply module so as to avoid the overhigh or overlow voltage on the LED driving chip and ensure the stability of the LED driving chip.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of an embodiment of an LED driving circuit according to the present invention;
FIG. 2 is a flowchart of a first embodiment of the LED control protection method of the present invention;
FIG. 3 is a flowchart of a second embodiment of the LED control protection method of the present invention;
fig. 4 is a flowchart of a third embodiment of the LED control protection method of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides an LED driving circuit which is applied to an LED driving device, and the LED driving device can be arranged in various devices such as a washing machine, a microwave oven, a television and the like. Referring to fig. 1, the LED driving circuit includes a power module 10, an LED driving chip 20, a diode group 30, and a control chip 40;
the output end of the control chip 40 is connected with the power module 10, the input end of the control chip is connected with the cathode of the diode group 30, and the control end of the control chip is connected with the LED driving chip 20;
the diode group 30 has an anode connected to the power module 10 and a cathode connected to the LED driving chip 20.
The control chip 40 can detect the output voltage on the negative electrode of the diode group, and the detected output voltage is the load voltage on the LED driving chip 20. When the control chip 40 detects the rise of the output voltage, that is, the load voltage on the LED driving chip 20 rises, the chip temperature of the driving chip 20 will rise along with the rise of the load voltage, so that the processing efficiency of the LED driving chip 20 may be reduced due to the excessively high temperature, and even damage may occur. Therefore, the control chip 40 can detect the load voltage on the LED driving chip 20, and can reduce the power voltage output by the power module 10 when detecting that the load voltage is too high, so that the load voltage of all loads on the LED driving circuit is reduced to avoid the load voltage on the LED driving chip 20 being too high. Likewise, when the control chip 40 detects that the load voltage is too low, the power supply voltage output by the power supply module 10 can be adjusted to increase the load voltage of all loads on the LED driving circuit.
It should be noted that, at each start-up of the LED driving circuit, the control chip 40 may control the power module 10 to output a predetermined steady voltage, at which the load voltage on the LED driving chip 20 and the series-connected diodes on the diode group 30 may be ensured to operate at the rated voltage. However, the temperature of the LEDs will increase after a period of operation, and the load voltage across the LEDs will decrease as the temperature increases, i.e. the total voltage drop across each string of LEDs on the set of LEDs 30 decreases, resulting in an increase in the load voltage across the LED driver chip 20 after a period of operation. The feedback voltage received by the power module 10 is regulated by the control chip 20, so that the power voltage output by the power module 10 can be effectively regulated, and the load voltage on the LED driving chip 20 is regulated.
In the embodiment, the control chip 40 is utilized to connect the power panel, namely the power module 10 and the LED driving panel, namely the LED driving chip 20, into a closed loop system, the control chip 40 obtains the output voltage in the connected diode group 30, and then calculates and adjusts the output voltage of the power module 10 according to the voltage and the ideal state of the circuit obtained after debugging, so as to adjust the load voltage of the diode group 30 and the LED driving chip 20, and reduce the load voltage of the LED driving chip 20 while the output voltage of the diode group 30 in the circuit reaches the ideal state, so as to avoid the reduction or damage of the operation efficiency caused by the temperature rise of the LED driving chip 20 due to the over high voltage, ensure the reliability of the LED driving chip 20, and achieve the purposes of reducing loss, reducing the temperature rise of components and improving the reliability.
The LED driving circuit comprises a power module 10, an LED driving chip 20, a diode group 30 and a control chip 40; the output end of the control chip 40 is connected with the power module 10, the input end of the control chip is connected with the cathode of the diode group 30, and the control end of the control chip is connected with the LED driving chip 20; the diode group 30 has an anode connected to the power module 10 and a cathode connected to the LED driving chip 20. The invention obtains the optimal state of the voltage in the circuit through debugging, monitors the cathode voltage of the diode group 30 in the circuit in real time through the control chip 40, and adjusts the voltage in the circuit to an ideal state according to the corresponding cathode voltage of the diode group 30, thereby reducing the influence caused by the temperature rise of the LED driving chip 20 and ensuring the stability of the LED driving chip 20.
Optionally, the control chip 40 is a micro control chip, and includes a digital-to-analog converter DAC, and an output terminal of the digital-to-analog converter DAC is connected to the power module 10.
In this embodiment, the control chip 40 includes a digital-to-analog converter DAC, an output terminal of the DAC is connected to the power module 10, and an input terminal of the DAC is connected to the control chip 40. The input end of the DAC receives the digital signal sent by the control chip 40 after calculation, and outputs corresponding feedback voltage to the power module 10 at the output end according to the digital signal. In this embodiment, the DAC (digital-to-analog converter) end of the control chip 40 is connected to the FB end of the power module 10, so that the required optimal operating voltage is found for the normal operation of the diode group 30 according to the characteristics of the diode group 30 in the joint adjustment stage of the power module 10, the LED driving chip 20 and the diode group 30 according to the preset software control algorithm, and the power module 10, the LED driving chip 20 and the diode group 30 can operate stably in this state for a long time.
Optionally, the control chip 40 is a micro control chip, and includes an analog-to-digital converter ADC, where an input terminal of the analog-to-digital converter ADC is connected to a cathode of the diode group 30.
In this embodiment, the control chip 40 includes an analog-to-digital converter ADC, the input end of the ADC is connected to the diode group 30, and the output end of the ADC is connected to the control chip 40. The input end of the ADC receives the output voltage value of the connected diode group 30, and outputs the output voltage value to the control chip 40 after analog-to-digital conversion. In this embodiment, the ADC (analog-digital converter) of the control chip 40 is used to monitor the voltage of the negative terminal v_led-end of the diode group 30 in real time, and when the voltage of the negative terminal v_led-end of the diode group 30 changes due to the change of the working environment, the DAC (digital-analog converter) of the control chip 40 is adjusted to output a voltage by calculation and comparison of the control chip 40, and the v_led+ voltage output by the power module 10 is adjusted, so that the system returns to the optimal state for working.
Optionally, the control terminal of the control chip 40 is connected to the LED driving chip 20 through a communication bus.
In the present embodiment, in the joint adjustment stage of the power module 10, the LED driving chip 20 and the diode group 30, the control chip 40 sets the current of all the diode groups 30 to a rated value through the SPI bus communication bus, the DAC output voltage in the control chip 40 is 2.5V, and the actual current value of the diode group 30 in this state is smaller than the rated value.
Optionally, the diode group 30 includes a plurality of series diode groups LBn, each series diode assembly LBn is formed by connecting a plurality of diodes in series, and each series diode assembly LBn has an anode connected to the power module 10 and a cathode connected to a corresponding interface of the LED driving chip 20. .
In this embodiment, the circuit is first debugged. The output voltages v_led 1-to v_ledn-of the series diode assembly LBn and the currents flowing through the LB1 to LBn of the diode group 30 are monitored, the output voltage of the DAC in the control chip 40 is gradually reduced by a preset software algorithm, the output voltage of the v_led+ is gradually increased by the power module 10, when the currents of all the diode groups 30 reach the rated current, the voltage value B of the ADC and the voltage value C of the DAC are recorded by the control chip 40, and the voltage values C of the DAC and the MCU EEPROM (erasable programmable read only memory) are stored, and the debugging and confirming work is completed.
Before the diode group 30 is normally operated every time, the DAC output voltage value C of the control chip 40 is fed back to the power module 10, and the power module 10 confirms the debugged optimal operation VLED+ voltage value before outputting, so that the system works in an optimal state.
Since the VF value of the diode group 30 decreases with an increase in temperature, the V_LED-voltage increases, and thus the DR_IC temperature rise in the LED driving chip 20 increases. In order to further reduce the temperature rise of the LED driving chip, the ADC function of the control chip 40 may be used to sample the voltage at the VLED-end, (see ADC1 and ADC2 in the figure), the voltage value of the DAC is gradually increased on the basis of C, the voltages of v_led+ and v_led- (the input voltage of the ADC) are reduced, when the input voltage of the ADC is reduced to be equal to the voltage value B, the optimum operating state is reached, the DAC voltage is maintained unchanged, and the power module 10 and the LED driving chip 20 reach the highest operating efficiency.
The invention also provides an LED control protection method, please refer to fig. 2, fig. 2 is a flow chart of a first embodiment of the LED control protection method of the invention, wherein the LED control protection method is applied to the LED driving circuit, and the LED control protection method comprises the following steps:
step S10, detecting output voltage of each serial diode component in the diode group to the LED driving chip;
in this embodiment, each diode group includes a plurality of series diode assemblies, and each series diode assembly is formed by connecting a plurality of light emitting diodes in series. When the LED driving circuit is started, the control chip sends corresponding feedback voltage to the power module so that the power module outputs corresponding power voltage to supply power for the diode group and the LED driving chip. When the LED driving circuit operates, the control chip can sample and detect the output voltage output to the LED driving chip by each serial diode assembly, so as to determine whether the load voltage on the LED driving chip is too large or too small.
Step S20, adjusting the power supply voltage of the power supply module according to the output voltage of each series diode assembly.
After the control chip determines the load voltage on the LED driving chip according to the output voltage of each serial diode assembly, whether the voltage on the LED driving chip is too large or too small is determined according to the detected load voltage. And when the voltage on the LED driving chip is overlarge or undershot, adjusting the power supply voltage output by the power supply module by adjusting the feedback voltage output to the power supply module until the voltage on the LED driving chip reaches a normal voltage range.
According to the embodiment, the control chip is arranged to sample and detect the output voltage of the diode group, so that the power supply voltage output by the power supply module can be timely adjusted when the voltage on the LED driving chip is overlarge or is overlarge, and the voltage on the LED driving chip is adjusted to be within a normal voltage range, so that the LED driving chip is protected from damage caused by overlarge or is overlarge.
Further, referring to fig. 3, fig. 3 is a flowchart of a second embodiment of the LED control protection method according to the present invention, based on the embodiment shown in fig. 2, the step S10, before the step of detecting the output voltage of each series diode assembly in the diode group to the LED driving chip, further includes:
step S30, controlling the power supply module to output a first power supply voltage, and detecting current and output voltage corresponding to each series diode component in the diode group in real time;
step S40, reducing the feedback voltage output to the power module to increase the power voltage output by the power module;
step S50, when the current of all the series diode assemblies is higher than the rated current, determining the power supply voltage output by the power supply module as a second power supply voltage, and determining the detected output voltage corresponding to each series diode assembly as a stable voltage;
and step S60, when the diode group is started, controlling the power supply module to output the second power supply voltage.
In this embodiment, before the LED driving circuit is first used, it is also necessary to determine the power supply voltage output by the power supply module at each start. That is, the control chip controls the power supply module to output a first power supply voltage having a low voltage, and detects a current flowing through each of the series diode assemblies and the output voltage at the first power supply voltage. At this time, under the first power voltage, the LED driving chip and the LEDs on the LED group are lower than the rated operating voltage.
After the power module outputs the first power voltage, the control chip can increase the power voltage output by the power module by reducing the feedback voltage output to the power module. During the rise of the supply voltage, the load voltage on the diode group and the load voltage on the LED driving circuit both rise, as does the current on each series diode assembly. The control chip can detect the current flowing through each series diode assembly at this time and judge whether the detected current is greater than the rated current of the light emitting diode. When the current flowing through all the series diode components reaches the rated current, the LED is in the rated working state, and the power supply voltage output by the power supply module can be used as the second power supply voltage. It is understood that the second supply voltage is greater than the first supply voltage. When each LED is in the rated working state, the output voltage of the diode group detected by the control chip is the stable voltage for the LED driving chip to work stably.
After the second power supply voltage is determined, the control chip sends corresponding feedback voltage to the clerk module when the LED driving circuit is started each time, so that the power supply module outputs the second power supply voltage. And after the LED driving circuit works for a period of time, the power supply voltage output by the power supply module is adjusted in real time so as to protect the LED driving chip and improve the safety and reliability of the LED driving circuit.
Further, referring to fig. 4, fig. 4 is a flowchart of a third embodiment of the LED control protection method according to the present invention, based on the embodiment shown in fig. 2, the step S20 of adjusting the power supply voltage of the power supply module according to the output voltage of each series diode assembly includes:
step S21, when the output voltage of each series diode component is increased, the feedback voltage output to the power module is increased to reduce the power voltage output by the power module, and the output voltage of each series diode component in the diode group is detected in real time;
step S22, when the output voltage of each series diode component is reduced, reducing the feedback voltage output to the power module so as to improve the power voltage output by the power module, and detecting the output voltage of each series diode component in the diode group in real time;
step S23, when the output voltage corresponding to each series diode component is a stable voltage, the feedback voltage output to the power module is maintained.
In this embodiment, the control chip may determine whether the voltage on the LED driving chip is too high or too low based on the detected output voltage of each of the series diode assemblies. Specifically, when the output voltage is detected to be reduced, the voltage on the LED driving chip is indicated to be too low, and at this time, the control chip can reduce the feedback voltage output to the power module. When the feedback voltage is reduced, the output power supply voltage of the power supply module is increased. Conversely, when the control chip detects that the output voltage rises, the feedback voltage output to the power module can be raised, so that the power module reduces the output power voltage. When the control chip detects that the output voltage, namely the voltage on the LED driving chip is within the normal voltage range, the feedback voltage output to the power supply module can be kept unchanged, so that the LED driving circuit can keep normal operation.
The invention also provides an LED driving device, which includes an LED driving circuit, and the structure of the LED driving circuit can refer to the above embodiment and is not described herein again. It should be noted that, since the LED driving device of the present embodiment adopts the technical scheme of the LED driving circuit, the LED driving device has all the beneficial effects of the LED driving circuit.
In addition, an embodiment of the present invention further proposes a computer readable storage medium, on which an LED control protection program is stored, where the storage medium may be a Memory 1005 in the terminal of fig. 1, or may be at least one of ROM (Read-Only Memory)/RAM (Random Access Memory ), magnetic disk, and optical disk, and the computer readable storage medium includes several instructions to cause a member device (which may be a mobile phone, a computer, a server, or a television, etc.) having a processor to perform the LED control protection method according to the embodiments of the present invention.
It is appreciated that in the description herein, reference to the terms "one embodiment," "another embodiment," "other embodiments," or "first through nth embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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 system 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 system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description of the invention and the accompanying drawings is only illustrative, and is not intended to limit the scope of the invention, but rather is to be construed in any way in view of the following description, the accompanying drawings and the like.
Claims (6)
1. The LED driving circuit is characterized by comprising a power supply module, an LED driving chip, a diode group and a control chip;
the output end of the control chip is connected with the power supply module, the input end of the control chip is connected with the negative electrode of the diode group, the control end of the control chip is connected with the LED driving chip, the control chip comprises an analog-digital converter and a digital-analog converter, the output end of the digital-analog converter is connected with the power supply module, the input end of the digital-analog converter is connected with the control chip, the input end of the analog-digital converter is connected with the negative electrode of the diode group, and the output end of the analog-digital converter is connected with the control chip;
the anode of the diode group is connected with the power supply module, and the cathode of the diode group is connected with the LED driving chip;
the control chip is used for detecting the output voltage of the diode group and adjusting the power supply voltage output by the power supply module according to the output voltage of the diode group, wherein when the output voltage of the diode group rises, the feedback voltage output to the power supply module rises; when the output voltage of the diode group is reduced, the feedback voltage output to the power module is reduced;
the power supply module is used for reducing the output power supply voltage when the feedback voltage rises; raising the output power supply voltage when the feedback voltage decreases;
the control chip is further configured to obtain a stable voltage of the diode group, and maintain a feedback voltage output to the power module when the output voltage of the diode group is consistent with the stable voltage.
2. The LED driving circuit of claim 1, wherein the diode group comprises a plurality of series diode assemblies, each series diode assembly being formed by a plurality of diodes in series, the anode of each series diode assembly being connected to the power module and the cathode being connected to the corresponding interface of the LED driving chip.
3. An LED control protection method, characterized in that the LED control protection method is applied to the LED driving circuit of any one of claims 1 to 2, and the LED control protection method includes the steps of:
the step of detecting the output voltage of each series diode component in the diode group to the LED driving chip comprises the following steps: controlling the power supply module to output a first power supply voltage, and detecting current and output voltage corresponding to each series diode component in the diode group in real time; reducing the feedback voltage output to the power supply module to increase the power supply voltage output by the power supply module; when the current of all the series diode assemblies is higher than the rated current, determining the power supply voltage output by the power supply module as a second power supply voltage, and determining the detected output voltage corresponding to each series diode assembly as a stable voltage; when the diode group is started, controlling the power supply module to output the second power supply voltage;
when the output voltage of each series diode component is increased, the feedback voltage output to the power module is increased so as to reduce the power voltage output by the power module, and the output voltage of each series diode component in the diode group is detected in real time;
and when the output voltage corresponding to each series diode component is a stable voltage, maintaining the feedback voltage output to the power supply module.
4. The LED control protection method of claim 3, wherein the step of adjusting the power supply voltage of the power supply module according to the output voltage of each of the series diode assemblies comprises:
when the output voltage of each series diode component is reduced, reducing the feedback voltage output to the power module so as to improve the power voltage output by the power module, and detecting the output voltage of each series diode component in the diode group in real time;
and when the output voltage corresponding to each series diode component is a stable voltage, maintaining the feedback voltage output to the power supply module.
5. An LED driving device, comprising a memory, a processor, and an LED control protection program stored on the memory and operable on the processor, wherein: the LED control protection program, when executed by the processor, implements the steps of the LED control protection method as set forth in any one of claims 3 to 4.
6. A computer readable storage medium, wherein an LED control protection program is stored on the computer readable storage medium, and the LED control protection program, when executed by a processor, implements the steps of the LED control protection method according to any one of claims 3 to 4.
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| CN201911420455.8A CN110996457B (en) | 2019-12-31 | 2019-12-31 | LED driving circuit, device, LED control protection method and storage medium |
| PCT/CN2020/110942 WO2021135278A1 (en) | 2019-12-31 | 2020-08-25 | Led drive circuit, device, led control and protection method, and storage medium |
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| CN201911420455.8A CN110996457B (en) | 2019-12-31 | 2019-12-31 | LED driving circuit, device, LED control protection method and storage medium |
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| CN110996457B (en) * | 2019-12-31 | 2023-05-23 | 惠州视维新技术有限公司 | LED driving circuit, device, LED control protection method and storage medium |
| CN113178171B (en) * | 2021-04-07 | 2022-09-02 | 深圳Tcl新技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
| CN114141203B (en) * | 2021-12-03 | 2023-04-07 | Tcl华星光电技术有限公司 | Backlight driving circuit and display device |
| CN114708839B (en) * | 2022-04-02 | 2023-08-22 | Tcl华星光电技术有限公司 | Backlight module and display device |
| US11763760B1 (en) | 2022-04-02 | 2023-09-19 | Tcl China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
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| WO2021135278A1 (en) | 2021-07-08 |
| CN110996457A (en) | 2020-04-10 |
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