CN110996457A - LED drive circuit, device, LED control protection method and storage medium - Google Patents
LED drive circuit, device, LED control protection method and storage medium Download PDFInfo
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- CN110996457A CN110996457A CN201911420455.8A CN201911420455A CN110996457A CN 110996457 A CN110996457 A CN 110996457A CN 201911420455 A CN201911420455 A CN 201911420455A CN 110996457 A CN110996457 A CN 110996457A
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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
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- 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]
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Abstract
The invention discloses an LED drive circuit, an LED drive device, an LED control protection method and a storage medium, wherein the circuit comprises a power module, an LED drive chip, a diode group and a control chip; the output end of the control chip is connected with the power module, the input end of the control chip is connected with the cathode 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, and the power supply voltage output by the power supply module is adjusted, so that the phenomenon that the voltage on the LED driving chip is too high or too low is avoided, and the stability of the LED driving chip is ensured.
Description
Technical Field
The invention relates to the technical field of LED driving, in particular to an LED driving circuit, an LED driving device, an LED control protection method and a storage medium.
Background
The LED is an abbreviation of Light Emitting Diode, and is an english abbreviation of Light Emitting Diode. The semiconductor diode can convert electric energy into light energy. The light emitting diode is composed of a PN junction and has unidirectional conductivity.
At present, in the actual use process of the linear constant current driving circuit of the LED on the market, 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 affected.
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 influenced by the temperature rise of the LED driving chip caused by unstable voltage of a driving circuit.
In order to achieve the above object, the present invention provides an LED driving circuit, which includes 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 module, the input end of the control chip is connected with the cathode 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 increase a feedback voltage output to the power module when the output voltage of the diode group increases; decreasing a feedback voltage output to the power module when an output voltage of the diode group decreases;
the power supply module is used for reducing the output power supply voltage when the feedback voltage is increased; and boosting the output power supply voltage when the feedback voltage is reduced.
Optionally, 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.
Optionally, the diode group includes a plurality of diode assemblies connected in series, each diode assembly connected in series is formed by a plurality of diodes, an anode of each diode assembly connected in series is connected to the power module, and a cathode of each diode assembly is connected to the corresponding interface of the LED driving chip.
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:
detecting the output voltage output to the LED driving chip by each series diode assembly in the diode group;
the supply voltage of the power supply module is adjusted according to the output voltage of each series diode component.
Optionally, before the step of outputting the output voltage from each series diode assembly in the detection 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 the current and the output voltage corresponding to each series diode assembly in the diode assembly in real time;
reducing the feedback voltage output to the power supply module to boost 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 component comprises:
when the output voltage of each series diode component rises, the feedback voltage output to the power supply module is increased to reduce the power supply voltage output by the power supply 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 series diode component is stable voltage, maintaining the feedback voltage output to the power supply module
Optionally, the step of adjusting the power supply voltage of the power supply module according to the output voltage of each series diode component comprises:
when the output voltage of each series diode component is reduced, reducing the feedback voltage output to the power supply module to improve the power supply voltage output by the power supply 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 series diode component is stable voltage, maintaining the feedback voltage output to the power supply module
In addition, to achieve the above object, the present invention further provides an LED driving apparatus, which includes a memory, a processor, and an LED control protection program stored in 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, to achieve the above object, the present invention also provides a computer readable storage medium having an LED control protection program stored thereon, 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 drive circuit, an LED drive device, an LED control protection method and a storage medium, wherein the LED drive circuit comprises a power module, an LED drive chip, a diode group and a control chip; the output end of the control chip is connected with the power module, the input end of the control chip is connected with the cathode 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 module, and the cathode of the diode group is connected with the LED driving chip. The invention firstly 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 voltage output by the power module, thereby avoiding the over-high or over-low voltage on the LED driving chip and ensuring 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 used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an LED driving circuit according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of a first embodiment of the LED control protection method according to the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of the LED control protection method according to the present invention;
fig. 4 is a flowchart illustrating an LED control protection method according to a third embodiment of the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an LED drive circuit, which is applied to an LED drive device, and the LED drive 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 is connected with the cathode of the diode group 30, and the control end is connected with the LED driving chip 20;
the anode of the diode group 30 is connected to the power module 10, and the cathode is connected to the LED driving chip 20.
The control chip 40 can detect the output voltage at the cathode 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 increase of the output voltage, that is, the load voltage on the LED driving chip 20 increases, the chip temperature of the driving chip 20 will increase with the increase of the load voltage, so that the LED driving chip 20 may have a low processing efficiency due to an excessively high temperature, and may even be damaged. Therefore, the control chip 40 can detect the load voltage on the LED driving chip 20, and when the load voltage is detected to be too high, the power voltage output by the power module 10 can be reduced, so that the load voltages of all loads on the LED driving circuit are reduced to avoid the load voltage on the LED driving chip 20 being too high. Similarly, when the control chip 40 detects that the load voltage is too low, the power supply voltage outputted by the power supply module 10 may also be adjusted to boost the load voltage of all loads on the LED driving circuit.
It should be noted that, each time the LED driving circuit is started, the control chip 40 may control the power module 10 to output a predetermined stable voltage, at which the load voltage on the LED driving chip 20 and the operation of the plurality of series diodes on the diode group 30 at the rated voltage are ensured. However, the temperature of the LED will increase after a certain period of operation, and the load voltage across the LED will decrease when the temperature increases, i.e. the total voltage drop of each string of LEDs on the diode group 30 decreases, so that the load voltage on the LED driving chip 20 increases after a certain period of operation. The feedback voltage received by the power module 10 is adjusted by the control chip 20, so that the power voltage output by the power module 10 can be effectively adjusted, and the load voltage on the LED driving chip 20 is adjusted.
In the embodiment, the control chip 40 is used to connect the power board, i.e. the power module 10, and the LED driving board, i.e. the LED driving chip 20, into a closed-loop system, the control chip 40 obtains the output voltage of 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 voltages of the diode group 30 and the LED driving chip 20, so that the output voltage of the diode group 30 in the circuit reaches the ideal state and the load voltage of the LED driving chip 20 is reduced, thereby avoiding the reduction or damage of the operating efficiency of the LED driving chip 20 caused by the temperature rise due to the over-high voltage, ensuring the reliability of the LED driving chip 20, and achieving the purposes of reducing loss, reducing the temperature rise of components, and improving the reliability.
The LED driving circuit of the present invention 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 is connected with the cathode of the diode group 30, and the control end is connected with the LED driving chip 20; the anode of the diode group 30 is connected to the power module 10, and the cathode is connected to the LED driving chip 20. The invention firstly obtains the optimal state of the voltage in the circuit through debugging, monitors the voltage of the cathode of the diode group 30 in the circuit in real time through the control chip 40, and then adjusts the voltage in the circuit to an ideal state according to the corresponding adjustment of the voltage of the cathode 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 a corresponding feedback voltage to the power module 10 at the output end according to the digital signal. In the present embodiment, a DAC (digital-to-analog converter) terminal of the control chip 40 is connected to an FB terminal of the power module 10, and according to a preset software control algorithm, an optimal operating voltage required for the diode group 30 to normally operate is found in a joint tuning stage of the power module 10, the LED driving chip 20, and the diode group 30 according to characteristics of the diode group 30, so that the power module 10, the LED driving chip 20, and the diode group 30 can stably operate 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, and an input terminal of the analog-to-digital converter ADC is connected to the cathode of the diode set 30.
In this embodiment, the control chip 40 includes an analog-to-digital converter ADC, the input terminal of the ADC is connected to the diode set 30, and the output terminal of the ADC is connected to the control chip 40. The input terminal 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 the present 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 change of the working environment causes the voltage of the negative terminal V _ LED-end of the diode group 30 to change, the DAC (digital-analog converter) of the control chip 40 is adjusted to output a voltage through calculation and comparison of the control chip 40, and the V _ LED + voltage output by the power module 10 is adjusted to make the system work in an optimal state.
Optionally, the control terminal in the control chip 40 is connected to the LED driving chip 20 through a communication bus.
In the present embodiment, at the stage of joint regulation of the power module 10, the LED driving chip 20 and the diode groups 30, the control chip 40 sets the currents of all the diode groups 30 as the rated values through the SPI bus communication bus, the DAC output voltage in the control chip 40 is 2.5V, and the actual current values of the diode groups 30 are smaller than the rated values.
Optionally, the diode set 30 includes a plurality of series diode sets LBn, each series diode set LBn is formed by a plurality of diodes connected in series, and each series diode set 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 debugged first. The output voltages V _ LED 1-V _ LEDn-of the series diode component LBn and the currents flowing through LB 1-LBn of the diode group 30 are monitored, the output voltage of the DAC in the control chip 40 is gradually reduced through a preset software algorithm, the output voltage of the V _ LED + is gradually increased by the power module 10 at the moment, when the currents of all the diode groups 30 reach the rated current, the control chip 40 records the voltage value B of the ADC and the voltage value C of the DAC at the moment and stores the voltage values into an MCU EEPROM (erasable programmable read-only memory), and at the moment, debugging and confirming work is completed.
Before the diode group 30 of the complete machine works normally each 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 working VLED + voltage value before outputting, so that the system works in the optimal state.
Since the VF of the diode set 30 decreases with the temperature, the V _ LED-voltage increases, and 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 voltage at the VLED-end can be sampled by the ADC function of the control chip 40 (see ADC1 and ADC2 in the figure), the voltage value of the DAC is gradually increased based on C, the voltages of V _ LED + and V _ LED- (input voltage of the ADC) are decreased, when the input voltage of the ADC is decreased to be equal to the voltage value B, the optimal working state is reached, the voltage of the DAC is maintained, and the power module 10 and the LED driving chip 20 reach the highest working efficiency.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the LED control protection method according to the present invention, wherein the LED control protection method is applied to the LED driving circuit, and the LED control protection method includes the following steps:
step S10, detecting the output voltage of each series diode assembly in the diode group to the LED driving chip;
in this embodiment, each diode group includes a plurality of series diode components, and each series diode component 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 supply module, so that the power supply module outputs corresponding power supply voltage to supply power for the diode group and the LED driving chip. When the LED driving circuit runs, the control chip can perform sampling detection on the output voltage output to the LED driving chip by each series diode assembly, so that whether the load voltage on the LED driving chip is too large or too small is determined.
In step S20, the power supply voltage of the power supply module is adjusted according to the output voltage of each series diode component.
After the control chip determines the load voltage on the LED driving chip according to the output voltage of each series diode component, whether the voltage on the LED driving chip is too large or too small is determined according to the detected load voltage. When the voltage on the LED driving chip is too large or too small, the feedback voltage output to the power supply module is regulated to adjust the power supply voltage output by the power supply module until the voltage on the LED driving chip reaches a normal voltage range.
This embodiment is through setting up control chip and carrying out sampling detection to the output voltage of diode group, can in time adjust the mains voltage of power module output when voltage on the LED driver chip is too big or the undersize to within the voltage adjustment on the LED driver chip normal voltage scope, the protection LED driver chip avoids taking place to damage because of voltage is too big or the undersize.
Further, referring to fig. 3, fig. 3 is a flowchart illustrating a second embodiment of the LED control protection method according to the present invention, based on the above embodiment shown in fig. 2, before the step of detecting the output voltage of each serial diode component in the diode group output to the LED driving chip in step S10, the method further includes:
step S30, controlling the power module to output a first power voltage, and detecting the current and output voltage corresponding to each series diode assembly in the diode assembly in real time;
step S40, reducing the feedback voltage output to the power supply module to boost the power supply voltage output by the power supply module;
step S50, when the current of all the series diode assemblies is higher than the rated current, the power voltage output by the power module is determined as a second power voltage, and the detected output voltage corresponding to each series diode assembly is determined as a stable voltage;
step S60, when the diode group is activated, the power module is controlled to output the second power voltage.
In this embodiment, before the LED driving circuit is used for the first time, the power supply voltage output by the power supply module at each start-up needs to be determined. That is, the control chip controls the power module to output a first power voltage having a lower voltage, and detects a current flowing through each of the series diode modules and an output voltage at the first power voltage. At the moment, under the first power voltage, the LED driving chip and the light emitting diodes on the diode group are lower than the rated working voltage.
After the power supply module outputs the first power supply voltage, the control chip can increase the power supply voltage output by the power supply module by reducing the feedback voltage output to the power supply module. During the rise of the power supply voltage, the load voltage on the diode group and the load voltage on the LED driving circuit rise, and the current on each series diode group also rises. The control chip can detect the current flowing through each series diode assembly and judge whether the detected current is larger than the rated current of the light emitting diode. When the current flowing through all the series diode assemblies reaches the rated current, the light emitting diodes are 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 will be appreciated that the second supply voltage is greater than the first supply voltage. And when each light-emitting diode is in a 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 store clerk module every time the LED driving circuit is started, so that the power supply module outputs the second power supply voltage. And after the LED drive 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 drive chip and improve the safety and reliability of the LED drive circuit.
Further, referring to fig. 4, fig. 4 is a flowchart illustrating a third embodiment of the LED control protection method according to the present invention, based on the embodiment illustrated in fig. 2, wherein the step S20 of adjusting the power voltage of the power module according to the output voltage of each series diode assembly includes:
step S21, when the output voltage of each series diode component increases, increasing the feedback voltage output to the power module to reduce 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 S22, when the output voltage of each series diode assembly decreases, decreasing the feedback voltage output to the power module to increase the power voltage output by the power module, and detecting the output voltage of each series diode assembly in the diode assembly in real time;
in step S23, when the output voltage corresponding to each series diode assembly is a stable voltage, the feedback voltage output to the power module is maintained.
In this embodiment, the control chip can determine whether the voltage across the LED driving chip is too high or too low according to the detected output voltage of each series diode component. Specifically, when the output voltage is detected to be reduced, which indicates that the voltage on the LED driving chip is too low, the control chip may reduce the feedback voltage output to the power module. When the feedback voltage of the power supply module is reduced, the output power supply voltage is increased. Conversely, when the control chip detects that the output voltage is increased, the feedback voltage output to the power supply module can be increased, so that the power supply module reduces the output power supply voltage. When the control chip detects the output voltage, namely the voltage on the LED driving chip is within the normal voltage range, the feedback voltage output to the power module can be kept unchanged, so that the LED driving circuit can be kept to operate in a normal state.
The present invention further provides an LED driving apparatus, which includes an LED driving circuit, and the structure of the LED driving circuit can refer to the above embodiments, and is not described herein again. It should be understood that, since the LED driving device of the present embodiment adopts the technical solution 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 provides 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 in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions to enable a member device (which may be a mobile phone, a computer, a server, or a television, etc.) having a processor to execute the LED control protection method according to the embodiments of the present invention.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean 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 present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 an … …" does not exclude the presence of other like elements in a process, method, article, or system 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 solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An LED drive circuit is characterized by comprising a power supply module, an LED drive chip, a diode group and a control chip;
the output end of the control chip is connected with the power module, the input end of the control chip is connected with the cathode 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.
2. The LED driving circuit according to claim 1, wherein the control chip is configured to increase a feedback voltage output to the power supply module when the output voltage of the diode group increases; decreasing a feedback voltage output to the power module when an output voltage of the diode group decreases;
the power supply module is used for reducing the output power supply voltage when the feedback voltage is increased; and boosting the output power supply voltage when the feedback voltage is reduced.
3. The LED driving circuit according to claim 1, wherein 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.
4. The LED driving circuit according to any of claims 1-3, wherein the diode group comprises a plurality of series diode assemblies, each series diode assembly is formed by connecting a plurality of diodes in series, the anode of each series diode assembly is connected to the power module, and the cathode of each series diode assembly is connected to the corresponding interface of the LED driving chip.
5. An LED control and protection method is applied to the LED driving circuit of any one of claims 1-4, and comprises the following steps:
detecting the output voltage output to the LED driving chip by each series diode assembly in the diode group;
the supply voltage of the power supply module is adjusted according to the output voltage of each series diode component.
6. The LED control protection method of claim 5, wherein before the step of detecting the output voltage of each series diode assembly of the diode assembly to the LED driving chip, further comprising:
controlling the power supply module to output a first power supply voltage, and detecting the current and the output voltage corresponding to each series diode assembly in the diode assembly in real time;
reducing the feedback voltage output to the power supply module to boost 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;
and when the diode group is started, controlling the power supply module to output the second power supply voltage.
7. The LED control protection method of claim 6, wherein said step of adjusting the supply voltage of the power supply module according to the output voltage of each series diode assembly comprises:
when the output voltage of each series diode component rises, the feedback voltage output to the power supply module is increased to reduce the power supply voltage output by the power supply 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.
8. The LED control protection method of claim 6, wherein said step of adjusting the supply voltage of the power supply module according to the output voltage of each series diode assembly comprises:
when the output voltage of each series diode component is reduced, reducing the feedback voltage output to the power supply module to improve the power supply voltage output by the power supply 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.
9. An LED driving apparatus, comprising a memory, a processor, and an LED control protection program stored in the memory and executable on the processor, wherein: the LED control protection program realizes the steps of the LED control protection method according to any one of claims 5-8 when being executed by the processor.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a LED control protection program, which when executed by a processor implements the steps of the LED control protection method according to any one of claims 5 to 8.
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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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Also Published As
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| WO2021135278A1 (en) | 2021-07-08 |
| CN110996457B (en) | 2023-05-23 |
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