CN117354996B - Control system and method for LED driver, and readable storage medium - Google Patents
Control system and method for LED driver, and readable storage medium Download PDFInfo
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- CN117354996B CN117354996B CN202311436212.XA CN202311436212A CN117354996B CN 117354996 B CN117354996 B CN 117354996B CN 202311436212 A CN202311436212 A CN 202311436212A CN 117354996 B CN117354996 B CN 117354996B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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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
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Abstract
A control system and method for an LED driver, a readable storage medium, including an LED load, a first control unit configured to be connected with a first terminal of the LED load to provide a drive current to operate the LED load, and a second control unit. The second control unit is configured to be connected to the second terminal of the LED load and the first control unit, and adjust the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current. By the mutual cooperation of the first control unit and the second unit, the thermal efficiency can be optimized using the lowest voltage while maintaining a constant driving current when using various LEDs with the solution of the present application. By optimizing the power efficiency to drive, the light of sufficient brightness required can be driven while minimizing the internal heat generation amount.
Description
Technical Field
The present invention relates to the field of LED driving applications, and in particular, to a control system and method for an LED driver, and a readable storage medium.
Background
In LED driving applications, multiple LED arrays are required to emit light. Since more than one LED needs to be driven, the driving element generates a lot of heat, which results in reduced efficiency. In order to improve efficiency, the voltage applied to the driving circuit should be reduced, but if the voltage is too low, the normal current cannot be driven, and a problem of dimming of brightness occurs. Therefore, it is necessary to maintain the voltage above a certain level. However, since the forward bias voltage of the LED used is not constant, it is difficult to fix at a constant voltage.
Therefore, it is an urgent need in the art to propose a solution that can optimize thermal efficiency using the lowest voltage while maintaining a constant driving current when using LEDs.
It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a control system and method for an LED driver and a readable storage medium, which are used for solving the problem that an LED driving scheme in the prior art cannot achieve both constant driving current and lower voltage.
In order to solve the above technical problems, the present invention proposes a control system for an LED driver, comprising:
An LED load;
a first control unit configured to be connected to a first terminal of the LED load to supply a driving current to operate the LED load;
and a second control unit configured to be connected to the second terminal of the LED load and the first control unit, and to adjust the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current.
Optionally, the first control unit includes:
And a driving circuit including a first transistor connected to the second terminal of the LED load, and a second transistor connected in parallel with the first transistor.
Optionally, the first control unit further includes:
The output end of the operational amplifier is connected with the grid electrode of the first transistor and the grid electrode of the second transistor;
And the integrated circuit is connected with the drain electrode of the first transistor and the drain electrode of the second transistor and is used for outputting the driving current.
Optionally, the first control unit further includes:
one end of the first grounding resistor is connected with the source electrode of the first transistor, and the other end of the first grounding resistor is grounded;
One end of the second grounding resistor is connected with the source electrode of the second transistor, and the other end of the second grounding resistor is grounded;
And one end of the third resistor is connected with the integrated circuit, and the other end of the third resistor is connected with the drain electrode of the second transistor.
Optionally, the second control unit includes a buck converter, a first resistor, a variable resistor;
The buck converter is used for receiving an input power supply, transmitting the bias voltage to the LED load according to the resistance value ratio of the fourth resistor to the variable resistor;
The two ends of the variable resistor are respectively connected with a first terminal and a second terminal of the buck converter, one end of the first resistor is connected with the second terminal of the buck converter, and the other end of the first resistor is grounded.
Optionally, the second control unit further includes:
A modulation decoder operatively coupled to the buck converter and generating a control signal to change the resistance value of the variable resistor.
Optionally, the second control unit further includes:
A state detection circuit, operatively coupled to the modulation decoder, for detecting a magnitude for the drive current, the resistance value of the variable resistor being increased by the modulation decoder to increase the bias voltage when the drive current is below a target current.
Optionally, the bias voltage is obtained by the following formula:
VBIAS＝(1+R2/R1)*VFB；
Wherein V BIAS is the bias voltage, R 2 is the size of the variable resistor, R 1 is the size of the first resistor, and V FB is the feedback voltage output from the second terminal of the buck converter.
Based on the same inventive concept, the invention also provides a control method for the LED driver, comprising the following steps:
the first control unit is connected with a first terminal of the LED load to provide driving current to enable the LED load to work;
The second control unit is connected with the second terminal of the LED load and the first control unit, and adjusts the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current.
Based on the same inventive concept, the present invention also proposes a readable storage medium having stored thereon a computer program which, when executed by a processor, is capable of implementing the control method for an LED driver described in the above-mentioned feature description.
Compared with the prior art, the invention has the following beneficial effects:
The control system for the LED driver comprises an LED load, a first control unit and a second control unit, wherein the first control unit is configured to be connected with a first terminal of the LED load to provide driving current to enable the LED load to work. The second control unit is configured to be connected to the second terminal of the LED load and the first control unit, and adjust the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current. By the mutual cooperation of the first control unit and the second unit, the thermal efficiency can be optimized using the lowest voltage while maintaining a constant driving current when using various LEDs with the solution of the present application. By optimizing the power efficiency to drive, the light of sufficient brightness required can be driven while minimizing the internal heat generation amount.
The control method and the readable storage medium for the LED driver provided by the application belong to the same conception as the control system for the LED driver, so that the control method and the readable storage medium have the same beneficial effects and are not described in detail herein.
Drawings
Fig. 1 is a schematic structural diagram of a control system for an LED driver according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method for an LED driver according to another embodiment of the present invention;
100-LED load, 200-first control unit, 300-second control unit, 310-buck converter, 320-modulation decoder, 330-state detection circuit.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are 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 one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In order to maximize overall efficiency when driving a multi-channel LED, it is desirable to minimize the voltage applied to the current sink within the driving circuit while maintaining the desired LED current. Therefore, it is necessary to adjust the output voltage of a power supply circuit such as a buck converter to minimize the voltage applied to a current sink within the drive circuit while maintaining the desired LED current.
However, since the bias voltage across these LEDs is not constant, the voltage applied to the LED driver is also not constant. The LED lighting requires the use of a large current while the voltage applied to the LED driver causes the driving circuit to generate heat. This heat can reduce the efficiency of the LED and can sometimes cause the internal temperature to be too high, thereby causing the LED to not function properly. If the generated heat is released, the internal temperature rises, and the driving circuit may be damaged, so that the driving circuit must be cut off by the protection circuit, and the LED light disappears as a result, and the internal temperature must not be excessively high.
For this, by controlling the power supply voltage of the LED, the voltage applied to the LED driver is minimized. When a plurality of LEDs are used, since the LED forward bias voltages are different from each other, the LED power supply voltage can be controlled based on the minimum forward bias voltage. In this case, the driving circuit of the LED having the highest forward bias voltage cannot emit light of a desired brightness because the current driving capability is small and a sufficient current cannot be supplied. Finally, the supply voltage must be generated based on the LED with the lowest bias voltage in the LED array used in order to be able to emit light of the desired brightness while generating lower heat.
Therefore, in the embodiment of the present invention, when a plurality of LED arrays are used, the current applied to each LED array is minimized and the driving voltage of the required current is outputted by controlling the external power supply device. Here, the voltage applied to the driving circuit may be reduced to low by controlling a power supply device such as an external buck converter to generate a power supply voltage.
Referring to fig. 1, an embodiment of the present invention proposes a control system for an LED driver, including:
an LED load 100;
a first control unit 200 configured to be connected to a first terminal of the LED load 100 to supply a driving current to operate the LED load 100;
And a second control unit 300 configured to be connected to the second terminal of the LED load 100 and the first control unit 200, and to adjust the magnitude of the bias voltage output to the LED load 100 according to the magnitude of the received driving current.
Unlike the prior art, the control system for an LED driver according to the embodiment of the present application includes an LED load 100, a first control unit 200, and a second control unit 300, where the first control unit 200 is configured to be connected to a first terminal of the LED load 100 to provide a driving current to operate the LED load 100. The second control unit 300 is configured to be connected to the second terminal of the LED load 100 and the first control unit 200, and adjust the magnitude of the bias voltage output to the LED load 100 according to the magnitude of the received driving current. By the mutual cooperation of the first control unit 200 and the second unit, it is possible to optimize the thermal efficiency using the lowest voltage while maintaining a constant driving current when using various LEDs using the scheme of the present application. By optimizing the power efficiency to drive, the light of sufficient brightness required can be driven while minimizing the internal heat generation amount.
It will be appreciated by those skilled in the art that in this embodiment, the LED load 100 may be a plurality of LED arrays, and in particular, reference may be made to the structure shown in fig. 1, and in other embodiments, other structures may be used, without limitation.
In this embodiment, the first control unit 200 may understand an LED driving circuit for driving the LED load 100, and in general, the driving circuit of the LED load 100 may change a high voltage into a low voltage using a transformer, and perform rectifying and filtering so as to output a stable low voltage dc. The driving circuit of the LED load 100 can also use a capacitor to provide driving current through charging and discharging, and the circuit is simple, low in cost, but poor in performance and stability, and when the voltage of the power grid fluctuates, the LED is easy to burn out, and meanwhile, high-voltage non-isolation is output, so that an insulating protective shell is required. The power factor is low, the service life is short, and the method is generally only suitable for economic low-power products (within 5W). The driving circuit of the LED load 100 may also use one IC (integrated circuit) or a plurality of ICs to distribute the voltage, and the electronic components are of few kinds, very high power factor and power efficiency, no electrolytic capacitor is required, and the life span is long and the cost is low.
In this embodiment, referring to fig. 1, the first control unit 200 may include a driving circuit including a first transistor connected to the second terminal of the LED load 100, and a second transistor connected in parallel to the first transistor.
It can be appreciated by those skilled in the art that in this embodiment, the first transistor and the second transistor may be MOS transistors, and specifically, other types of MOS transistors such as PMOS transistors and NMOS transistors may be selected, which is not limited herein, and the types and models may be selected according to actual needs. In addition, since the LED load 100 is a plurality of LED arrays in the present embodiment, each LED array needs to be provided with a driving circuit, and the first control unit 200 includes driving circuits of all LED arrays in the present embodiment.
Specifically, in this embodiment, the first control unit 200 further includes an operational amplifier and an integrated circuit, where an output end of the operational amplifier is connected to the gate of the first transistor and the gate of the second transistor; the integrated circuit is connected with the drain electrode of the first transistor and the drain electrode of the second transistor and is used for outputting the driving current. In fig. 1 of the present embodiment, the operational amplifier OP 1 is an operational amplifier in the driving circuit of the first LED array, the operational amplifier OP N is an operational amplifier in the driving circuit of the nth LED array, the integrated circuit IC 1, the first transistor M 11, and the second transistor M 12 belong to the driving circuit of the first LED array, and the integrated circuit IC N, the first transistor M N1, and the second transistor M N2 belong to the driving circuit of the nth LED array.
With continued reference to fig. 1, in this embodiment, the first control unit 200 further includes:
one end of the first grounding resistor is connected with the source electrode of the first transistor, and the other end of the first grounding resistor is grounded;
One end of the second grounding resistor is connected with the source electrode of the second transistor, and the other end of the second grounding resistor is grounded;
And one end of the third resistor is connected with the integrated circuit, and the other end of the third resistor is connected with the drain electrode of the second transistor.
In fig. 1 of the present embodiment, the first grounding resistor R 11, the second grounding resistor R 12, and the third resistor R 13 belong to the driving circuit of the first LED array, and the first grounding resistor R N1, the second grounding resistor R N2, and the third resistor R N3 belong to the driving circuit of the nth LED array.
With continued reference to fig. 1, in this embodiment, the second control unit 300 may be understood as an external power supply device, and specifically, the second control unit 300 includes a buck converter 310, a first resistor, and a variable resistor;
The buck converter 310 is configured to receive an input power and transmit the bias voltage to the LED load 100 according to the ratio of the resistance values of the fourth resistor and the variable resistor;
The two ends of the variable resistor are respectively connected with a first terminal and a second terminal of the buck converter 310, one end of the first resistor is connected with the second terminal of the buck converter 310, and the other end of the first resistor is grounded.
Specifically, in the present embodiment, the second control unit 300 further includes:
A modulation decoder 320, the modulation decoder 320 and the buck converter 310 being operatively coupled and generating a control signal to vary the resistance value of the variable resistor.
Specifically, in the present embodiment, the second control unit 300 further includes:
A state detection circuit 330, the state detection circuit 330 and the modulation decoder 320 being operatively coupled to detect a magnitude for the drive current, the resistance value of the variable resistor being increased by the modulation decoder 320 to increase the bias voltage when the drive current is below a target current.
Specifically, in the present embodiment, the bias voltage is obtained by the following formula:
VBIAS ＝(1 + R2/R1)*VFB； (1)
Wherein V BIAS is the bias voltage, R 2 is the size of the variable resistor, R 1 is the size of the first resistor, and V FB is the feedback voltage output from the second terminal of the buck converter 310.
The first resistor may be disposed between the second terminal of the buck converter 310 and ground. The variable resistor may be arranged to connect the first terminal and the second terminal of the buck converter 310. The bias voltage can be determined by the above formula by the resistance value of the first resistor, the resistance value of the variable resistor, and the feedback voltage V FB output from the second terminal of the buck converter 310.
Further, capacitor C 1, which is a bypass capacitor for stabilizing the voltage, may be provided in parallel between the first terminal of the buck converter 310 and ground. An inductor L 1 is connected in series with the first terminal of the buck converter 310, and a capacitor C 1 may be connected in parallel with the inductor L 1. The first resistor may be connected in parallel between the second terminal of the buck converter 310 and ground.
Accordingly, the second control unit 300 may include a buck converter 310, the buck converter 310 configured to receive the input power and transmit bias power to the LED load 100 according to the ratio of the resistance values of the first resistor and the variable resistor.
Between the power supply V BAT and the LED load 100, the LED array emits light proportional to the current flowing. The current that emits these lights is generated by a driving circuit that drives the LEDs. The current generated by the driving circuit can be obtained by the standard voltage V REF and the operational amplifier (OP 1、……、OPN) and the first ground resistor (R 11、……、RN1) according to the following formula.
ILED＝ VREF/R (2)
Wherein I LED is the current generated by the driving circuit, and R is the resistance of the first grounding resistor.
If the voltage of the plurality of LEDs is high enough above the threshold voltage, the current I LED generated by equation 2 above can be driven. However, if the voltage of the LEDs drops, the current will drop, and the current required for the LEDs to operate properly will not flow. Therefore, the V BIAS voltage needs to be controlled to reach a minimum voltage that can enable the LED load 100 to operate normally. For this purpose, the output current is first checked to see if the current required for the proper operation of the LED load 100 flows.
With continued reference to fig. 1, the current of either I 1＝VREF/(R11 x M) or I N＝VREF/(RN1 x M) can be detected by a driver circuit and an integrated circuit connected to a second ground resistor (R12, … …, RN 2), where M is the difference in magnitude between M12 and M11, so that the current flowing through the LED can be checked by the current (I 1、……、IN) output by the integrated circuit.
It will be appreciated that the voltage applied to the drive circuit connected to the third resistor is less than the voltage applied to the drive circuit connected to the first ground resistor. It is thus known that the target current can be maintained even if the voltage of the plurality of LEDs drops.
The state detection circuit 330 may detect whether any of the currents (I1, … …, IN) output from the integrated circuit is lower than the target current. Here, the resistance value of the variable resistor connected between the first terminal and the second terminal of the buck converter 310 may be increased by the modulation decoder 320. Therefore, according to equation 1, the bias voltage V BIAS will increase, and thus the voltage of the LED load 100 will also increase.
The state detection circuit 330 may detect whether all currents (I1, … …, IN) output from the integrated circuit are higher than a target current. If it is higher than the target current, the resistance value of the variable resistor connected between the first terminal and the second terminal of the buck converter 310 is reduced by the modulation decoder 320. Therefore, according to equation 1, the bias voltage V BIAS will decrease accordingly, and thus the voltages of the plurality of LED loads 100 will also decrease.
In the course of repeating these operations, the current flowing through the LED load 100 reaches the target current value. Therefore, the current flowing through the LED load 100 reaches the target current by the minimum voltage, thereby improving power efficiency and minimizing heat generation.
In order to reduce power consumption, the voltage of the LED load 100 may be controlled within a specific voltage range. However, since the current characteristics to the LED driver voltage are not constant, there are many difficulties in optimizing the efficiency, such as the inability to obtain a desired output current or the possibility of driving with a lower voltage but applying only a higher voltage. The scheme provided by the embodiment of the invention can accurately detect and control the current flowing through the LED load 100, thereby realizing the most effective control.
Referring to fig. 2, based on the same inventive concept, an embodiment of the present invention further provides a control method for an LED driver, including:
s100: the first control unit is connected with a first terminal of the LED load to provide driving current to enable the LED load to work;
S200: the second control unit is connected with the second terminal of the LED load and the first control unit, and adjusts the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current.
Based on the same inventive concept, the embodiments of the present invention also provide a readable storage medium having stored thereon a computer program, which when executed by a processor, can implement the control method for an LED driver described in the above feature description.
The readable storage medium may be a tangible device that can hold and store instructions for use by an instruction execution device, such as, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the preceding. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: portable computer disks, hard disks, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static Random Access Memory (SRAM), portable compact disk read-only memory (CD-ROM), digital Versatile Disks (DVD), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove structures such as punch cards or grooves having instructions stored thereon, and any suitable combination of the foregoing. The computer program described herein may be downloaded from a readable storage medium to a respective computing/processing device or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives the computer program from the network and forwards the computer program for storage in a readable storage medium in the respective computing/processing device. The computer program used to perform the operations of the present invention may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as SMALLTALK, C ++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing electronic circuitry, such as programmable logic circuits, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for a computer program, which can execute computer-readable program instructions.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, systems, and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer programs. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the programs, when executed by the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer programs may also be stored in a readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the readable storage medium storing the computer program includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer program may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the computer program which is executed on the computer, other programmable apparatus or other devices implements the functions/acts specified in the flowchart and/or block diagram block or blocks.
In the description of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," or "particular examples," 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 are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.
Claims (8)
1. A control system for an LED driver, comprising:
An LED load;
a first control unit configured to be connected to a first terminal of the LED load to supply a driving current to operate the LED load;
A second control unit configured to be connected to a second terminal of the LED load and the first control unit, and to adjust a magnitude of a bias voltage output to the LED load according to a magnitude of the received driving current;
The first control unit includes:
A driving circuit including a first transistor connected to a first terminal of the LED load, and a second transistor connected in parallel with the first transistor;
The output end of the operational amplifier is connected with the grid electrode of the first transistor and the grid electrode of the second transistor;
And the integrated circuit is connected with the drain electrode of the first transistor and the drain electrode of the second transistor and is used for outputting the driving current.
2. The control system for an LED driver of claim 1, wherein the first control unit further comprises:
one end of the first grounding resistor is connected with the source electrode of the first transistor, and the other end of the first grounding resistor is grounded;
One end of the second grounding resistor is connected with the source electrode of the second transistor, and the other end of the second grounding resistor is grounded;
And one end of the third resistor is connected with the integrated circuit, and the other end of the third resistor is connected with the drain electrode of the second transistor.
3. The control system for an LED driver of claim 1, wherein the second control unit comprises a buck converter, a first resistor, a variable resistor;
the buck converter is used for receiving an input power supply and transmitting the bias voltage to the LED load according to the resistance value proportion of the first resistor and the variable resistor;
The two ends of the variable resistor are respectively connected with a first terminal and a second terminal of the buck converter, one end of the first resistor is connected with the second terminal of the buck converter, and the other end of the first resistor is grounded.
4. A control system for an LED driver as recited in claim 3, wherein the second control unit further comprises:
A modulation decoder operatively coupled to the buck converter and generating a control signal to change the resistance value of the variable resistor.
5. The control system for an LED driver of claim 4, wherein the second control unit further comprises:
a state detection circuit operatively coupled to the modulation decoder for detecting a magnitude of a drive current, the resistance value of the variable resistor being increased by the modulation decoder to increase the bias voltage when the drive current is below a target current.
6. A control system for an LED driver as recited in claim 3, wherein the bias voltage is obtained by the formula:
VBIAS =（1 + R2/R1）*VFB；
Wherein V BIAS is the bias voltage, R 2 is the size of the variable resistor, R 1 is the size of the first resistor, and V FB is the feedback voltage output from the second terminal of the buck converter.
7. A control method for an LED driver, comprising:
the first control unit is connected with a first terminal of the LED load to provide driving current to enable the LED load to work;
The second control unit is connected with the second terminal of the LED load and the first control unit, and adjusts the magnitude of the bias voltage output to the LED load according to the magnitude of the received driving current;
The first control unit includes:
A driving circuit including a first transistor connected to a first terminal of the LED load, and a second transistor connected in parallel with the first transistor;
The output end of the operational amplifier is connected with the grid electrode of the first transistor and the grid electrode of the second transistor;
And the integrated circuit is connected with the drain electrode of the first transistor and the drain electrode of the second transistor and is used for outputting the driving current.
8. A readable storage medium having stored thereon a computer program, which when executed by a processor is capable of implementing the control method for an LED driver as claimed in claim 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2023-0014202 | 2023-02-02 | ||
| KR20230014202 | 2023-02-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117354996A CN117354996A (en) | 2024-01-05 |
| CN117354996B true CN117354996B (en) | 2024-05-14 |
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