CN113411932A - Constant-brightness LED circuit and electronic equipment - Google Patents
Constant-brightness LED circuit and electronic equipment Download PDFInfo
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- CN113411932A CN113411932A CN202110546037.4A CN202110546037A CN113411932A CN 113411932 A CN113411932 A CN 113411932A CN 202110546037 A CN202110546037 A CN 202110546037A CN 113411932 A CN113411932 A CN 113411932A
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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]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention relates to a constant brightness LED circuit and an electronic device, comprising: an LED lamp and a power supply battery; the LED driving unit is connected with the LED lamp and used for receiving a driving signal to drive the LED lamp to work; the storage unit is used for prestoring a relation list, wherein the relation list defines the corresponding relation between the PWM duty ratio of the driving signal and the output voltage of the power supply battery; the voltage monitoring unit is connected with the power supply battery and is used for monitoring the real-time voltage of the power supply battery in the working process of the LED lamp; the control unit is connected with the storage unit and the voltage monitoring unit and used for acquiring a target PWM duty ratio according to the real-time voltage and the relation list; the control unit is further connected with the LED driving unit and used for generating a target driving signal according to the target PWM duty ratio so as to drive the LED driving unit to work. By implementing the invention, the constant brightness of the LED can be maintained when the voltage supplied by the battery changes, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of LED lamps, in particular to a constant-brightness LED circuit and electronic equipment.
Background
In electronic products, LED lamps are increasingly used for indication, and in some battery-powered products, when the battery-powered products indicate through the LED lamps, when the power supply voltage of the battery changes, the brightness of the LED indicator lamps also changes due to the change of the voltage. For example, when the battery supply voltage decreases, it may also affect the supply voltage of the LEDs, resulting in a decrease in the brightness of the LEDs, affecting the user experience.
Disclosure of Invention
The present invention is directed to a constant brightness LED circuit and an electronic device, which overcome some of the above technical drawbacks of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a constant brightness LED circuit comprising: an LED lamp and a power supply battery; and
the LED driving unit is connected with the LED lamp and used for receiving a driving signal to drive the LED lamp to work;
a storage unit for pre-storing a relationship list, wherein the relationship list defines a correspondence relationship between a PWM duty ratio of the driving signal and an output voltage of the power supply battery;
the voltage monitoring unit is connected with the power supply battery and is used for monitoring the real-time voltage of the power supply battery in the working process of the LED lamp;
the control unit is connected with the storage unit and the voltage monitoring unit and used for acquiring a target PWM duty ratio according to the real-time voltage and the relation list;
the control unit is further connected with the LED driving unit and used for generating a target driving signal according to the target PWM duty ratio so as to drive the LED driving unit to work.
Preferably, the LED lamp includes a plurality of LED light emitting units, and the LED driving unit includes a plurality of sub-driving units respectively connected to the plurality of LED light emitting units;
the relation list defines the sub-corresponding relation between the PWM duty ratios of the driving signals respectively corresponding to the plurality of sub-driving units and the output voltage of the power supply battery;
the control unit is respectively connected with the plurality of sub-driving units and is used for acquiring target PWM duty ratios respectively corresponding to the sub-driving units according to the real-time voltage and the sub-corresponding relation so as to generate a plurality of target driving signals respectively corresponding to the plurality of sub-driving units.
Preferably, the control unit includes a plurality of PWM signal output terminals, and the control unit is respectively connected to the plurality of sub-driving units through the plurality of PWM signal output terminals to respectively output the target driving signals corresponding to the sub-driving units.
Preferably, the driving circuit further comprises switching units respectively connected to receive a switching signal to drive the corresponding sub-driving units to be turned on or off;
the control unit is connected with the switch unit and used for generating the switch signal according to the target drive signal of the sub-drive unit.
Preferably, the generating the switching signal according to the target driving signal of the sub driving unit includes: when the target drive signal is at a high level, a high-level switching signal is generated, and when the target drive signal is at a low level, a low-level switching signal is generated.
Preferably, the control unit includes at least one PWM signal output terminal, and the control unit is connected to the plurality of sub-driving units through any PWM signal output terminal to output the target driving signal.
Preferably, the switch unit includes a first switch tube, a first end of the first switch tube is connected to the control unit, a second end of the first switch tube is connected to a first end of the corresponding sub-driving unit through the LED light emitting unit, and a third end of the third switch tube is connected to a supply voltage.
Preferably, the constant brightness LED circuit of the present invention further includes a first judgment unit;
the first judging unit is connected with the voltage monitoring unit and used for judging whether the real-time voltage is lower than a first preset value or not and driving the control unit to acquire the target PWM duty ratio according to the real-time voltage and the relation list when the real-time voltage is lower than the first preset value.
Preferably, the constant brightness LED circuit of the present invention further includes a second judging unit;
the second judging unit is connected with the voltage monitoring unit and used for judging whether the real-time voltage is lower than a second preset value or not and driving the control unit to turn off the output of the driving signal when the real-time voltage is lower than the second preset value.
The invention also provides an electronic device comprising a constant brightness LED circuit as described in any of the above.
The constant-brightness LED circuit and the electronic equipment have the following beneficial effects that: when the battery supply voltage changes, the LED brightness is kept constant, and the user experience is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of one embodiment of a constant brightness LED circuit of the present invention;
FIG. 2 is a logic block diagram of another embodiment of a constant brightness LED circuit of the present invention;
FIG. 3 is a partial circuit schematic of an embodiment of a constant brightness LED circuit of the present invention;
FIG. 4 is a schematic diagram of the drive signals of FIG. 3;
FIG. 5 is a logic block diagram of another embodiment of a constant brightness LED circuit of the present invention;
FIG. 6 is a partial circuit schematic of an embodiment of a constant brightness LED circuit of the present invention;
fig. 7 is a schematic diagram of the drive signals in fig. 6.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of a constant brightness LED circuit of the present invention, the constant brightness LED circuit includes: LED lamp 150 and power supply battery 110; the LED driving unit 140 is connected to the LED lamp 150 and is used for receiving a driving signal to drive the LED lamp 150 to work; a storage unit 160 for pre-storing a relationship list defining a correspondence relationship between the PWM duty of the driving signal and the output voltage of the power supply battery 110; the voltage monitoring unit 120 is connected to the power supply battery 110 and is configured to monitor a real-time voltage of the power supply battery 110 during the operation of the LED lamp 150; the control unit 130 is connected to the storage unit 160 and the voltage monitoring unit 120, and configured to obtain a target PWM duty ratio according to the real-time voltage and the relationship list; the control unit 130 is further connected to the LED driving unit 140, and configured to generate a target driving signal according to the target PWM duty ratio to drive the LED driving unit 140 to operate. Specifically, the LED lamp 150 is powered by the power supply battery 110, that is, the output voltage of the power supply battery 110 drives the LED to emit light or turn off through the LED driving unit 140. The LED driving unit 140 outputs a target driving signal through the control unit 130 to drive the LED driving unit 140 to generate a corresponding driving voltage or current to drive the LED lamp 150 to emit light. The voltage detection unit is connected to the power supply battery 110, and detects a real-time voltage of the power supply battery 110, and the control unit 130 obtains a PWM duty corresponding to the real-time voltage from a relationship list pre-stored in the storage unit 160 according to the detected real-time voltage and generates a target driving signal according to the PWM duty. By adjusting the PWM duty ratio, the average current input to the LED lamp 150 is kept constant, so that the brightness of the LED lamp 150 can be kept constant.
As shown in fig. 2 and 5, in an embodiment, the LED lamp 150 includes a plurality of LED light emitting units 151, and the LED driving unit 140 includes a plurality of sub driving units 141 respectively connected to the plurality of LED light emitting units 151; the relationship list defines a sub-correspondence relationship between the PWM duty ratios of the driving signals respectively corresponding to the plurality of sub-driving units 141 and the output voltage of the power supply battery 110; the control unit 130 is respectively connected to the plurality of sub-driving units 141, and is configured to obtain target PWM duty ratios respectively corresponding to the sub-driving units 141 according to the real-time voltage and the sub-correspondence relationship, so as to generate a plurality of target driving signals respectively corresponding to the plurality of sub-driving units 141. Specifically, the LED lamp 150 may be provided with a plurality of LED light-emitting units 151, wherein each LED light-emitting unit 151 is correspondingly connected to one sub-driving unit 141, the plurality of driving units herein form the LED driving unit 140, and the relationship list may include a plurality of sub-correspondence relationships respectively corresponding to the sub-driving units 141, that is, each LED light-emitting unit 151 may obtain a corresponding PWM duty ratio according to the corresponding sub-correspondence relationship through the corresponding sub-driving unit 141, so as to implement individual current control on each LED light-emitting unit 151.
As shown in fig. 2, the control unit 130 includes a plurality of PWM signal output terminals, and the control unit 130 is respectively connected to the plurality of sub-driving units 141 through the plurality of PWM signal output terminals to respectively output the target driving signals corresponding to the sub-driving units 141. That is, the sub driving units 141 corresponding to the LED light emitting units 151 may be individually driven by different PWM signals, respectively. In the specific circuit shown in fig. 3, the LED lighting unit 151 includes an LED1 and an LED2, wherein the driving unit corresponding to the LED1 includes a MOS transistor Q1, and the driving unit corresponding to the LED2 includes a MOS transistor Q2, which respectively receive driving signals input from different control terminals to drive operation. In fig. 4, corresponding to the time of the PWM1 and PWM2 driving signals, where T1 corresponds to the output of PWM1, which corresponds to the lighting time period of LED1, T2 is the PWM2 signal output, which corresponds to the lighting time of LED2, and T is the duty cycle of LED1 and LED2, i.e. the period of generating the driving signal by the control unit 130, it can be understood that during this period, the PWM1 and PWM2 signals respectively drive the corresponding LED lighting units 151 according to different duty ratios. In a specific circuit, R1 is 100R, R2 is 200R, VDD1 is 4V, VDD2 is 5V, operating voltage VF1 of LED1 is 2.8V, operating voltage VF2 of LED2 is 3V, lighting time T1 of LED1 is 1ms (duty ratio 1/5 is 20%: LED2 lighting time T2 is 1ms (duty ratio 1/5 is 20%), and PWM period T is 5 ms: the average current of the LED1 is: (VDD1-VF1)/R1 (T1/T) ═ 4-2.8)/100 (1/5) ═ 0.0024A, and the average current of the LED2 is: in order to maintain the average current of LED1 constant (i.e., constant luminance) when VDD1 changes, e.g., changes to 4.5v, (VDD2-VF2)/R2 (T2/T) ═ 0.002A, (5-3)/200 (1/5) ═ 0.002A, the time T1 after the change is found to be: (4.5-2.8)/100 × (t1/5) ═ 0.0024A, it can be found that t1 is 1.42ms, i.e. the duty cycle of LED1 becomes: when VDD1 changes, the duty ratio of LED1 can be changed to maintain the brightness of LED1 unchanged, i.e. when VDD1 changes, i.e. the duty ratio of LED1 changes. Wherein duty cycle adjustment of the LED2 may be similarly implemented.
As shown in fig. 5, in an embodiment of the present invention, the constant brightness LED circuit further includes switching units 142 respectively connected to receive a switching signal to drive the corresponding sub-driving units 141 to turn on or off; the control unit 130 is connected to the switch unit 142, and is configured to generate the switch signal according to a target driving signal of the sub-driving unit 141. Specifically, in order to ensure that the driving signal drives the driving circuit corresponding to the corresponding LED light-emitting unit 151, the LED light-emitting unit 151 that is not driven may be set to maintain the off state, that is, the corresponding large sub-driving unit 141 is turned off by the switching unit 142, so as to ensure that only the LED light-emitting unit 151 corresponding to the PWM duty is in the high-level lighted state.
Optionally, the generating the switching signal according to the target driving signal of the sub driving unit 141 includes: when the target drive signal is at a high level, a high-level switching signal is generated, and when the target drive signal is at a low level, a low-level switching signal is generated. The process of controlling the driving unit through the switching unit 142 includes generating a switching signal for driving the switching unit 142 to operate while generating a target driving signal, where the switching unit 142 corresponds to the sub-driving unit 141, and when the driving signal of the sub-driving unit 141 is at a high level, it represents that the corresponding LED light emitting unit 151 is lit at this time, and at this time, the corresponding sub-driving unit 141 is driven to be in an operating state through the switching signal. When the driving signal of the sub-driving unit 141 is at a low level, it represents that the corresponding LED light emitting unit 151 is to be turned off, and the switching signal drives the corresponding sub-driving unit 141 to be in an off state.
Optionally, the control unit 130 includes at least one PWM signal output terminal, and the control unit 130 is connected to the plurality of sub-driving units 141 through any PWM signal output terminal to output the target driving signal. Specifically, when the switch unit 142 is provided, the PWM control signal can be output through one PWM signal output end, and the switch unit 142 controls the corresponding sub-driving unit 141 to operate or turn off, so as to implement time-sharing use of the output level of the same PWM signal output end.
Optionally, the switch unit 142 includes a first switch tube, a first end of the first switch tube is connected to the control unit 130, a second end of the first switch tube is connected to a first end of the corresponding sub-driving unit 141 through the LED light emitting unit, and a third end of the third switch tube is connected to a supply voltage. In the specific circuit shown in fig. 6, the LED lighting unit 151 includes an LED1 and an LED2, wherein the driving unit corresponding to the LED1 includes a MOS transistor Q1, the corresponding switching unit 142 includes a MOS transistor Q11, the LED2 corresponding to the driving unit includes a MOS transistor Q2, and the corresponding switching unit 142 includes a MOS transistor Q21. The MOS transistor Q1 and the MOS transistor Q2 receive driving signals input from the same control end to drive. The output of the MOS transistor Q11 and the output of the MOS transistor Q21 are turned on or off by the control unit 130. As shown in fig. 7, in the control process, when the PWM is on for the time period t1, the LED1_ OFF is 0, so the LED1 is illuminable; since LED2_ OFF is 1, LED2 is not lit. When at time t2, the LED2_ OFF is controlled to 0, so that the LED2 is illuminable; since LED1_ OFF is 1, LED1 is not lit.
Optionally, the constant-brightness LED circuit of the present invention further includes a first determining unit; the first determining unit is connected to the voltage monitoring unit 120, and configured to determine whether the real-time voltage is lower than a first preset value, and drive the control unit 130 to obtain the target PWM duty ratio according to the real-time voltage and the relationship list when the real-time voltage is lower than the first preset value. During the voltage detection process, whether PWM duty ratio adjustment is carried out or not can be selected according to the actual voltage. When the voltage is higher than the first preset value, for example, the PWM duty cycle is not adjusted, and the brightness of the light emitting diode also meets the requirement, and the PWM duty cycle is not adjusted to adjust the brightness of the light emitting diode.
Optionally, the constant-brightness LED circuit of the present invention further includes a second judgment unit; the second determining unit is connected to the voltage monitoring unit 120, and configured to determine whether the real-time voltage is lower than a second preset value, and drive the control unit 130 to turn off the output of the driving signal when the real-time voltage is lower than the second preset value. When the battery voltage is reduced to a certain degree, that is, the PWM duty ratio cannot meet the requirement of brightness at this time, the adjustment is not performed any more, the LED lamp 150 may be directly turned off, or a preset PWM duty ratio may be used to maintain the LED lamp 150 to operate at the lowest brightness.
In addition, the electronic device of the present invention includes the constant brightness LED circuit as described in any one of the above. That is, in a battery powered device, constant brightness for LED operation can be achieved through the arrangement of the above-described circuitry.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A constant brightness LED circuit, comprising: an LED lamp and a power supply battery; and
the LED driving unit is connected with the LED lamp and used for receiving a driving signal to drive the LED lamp to work;
a storage unit for pre-storing a relationship list, wherein the relationship list defines a correspondence relationship between a PWM duty ratio of the driving signal and an output voltage of the power supply battery;
the voltage monitoring unit is connected with the power supply battery and is used for monitoring the real-time voltage of the power supply battery in the working process of the LED lamp;
the control unit is connected with the storage unit and the voltage monitoring unit and used for acquiring a target PWM duty ratio according to the real-time voltage and the relation list;
the control unit is further connected with the LED driving unit and used for generating a target driving signal according to the target PWM duty ratio so as to drive the LED driving unit to work.
2. The constant-brightness LED circuit according to claim 1, wherein the LED lamp comprises a plurality of LED light-emitting units, and the LED driving unit comprises a plurality of sub-driving units respectively connected with the plurality of LED light-emitting units;
the relation list defines the sub-corresponding relation between the PWM duty ratios of the driving signals respectively corresponding to the plurality of sub-driving units and the output voltage of the power supply battery;
the control unit is respectively connected with the plurality of sub-driving units and is used for acquiring target PWM duty ratios respectively corresponding to the sub-driving units according to the real-time voltage and the sub-corresponding relation so as to generate a plurality of target driving signals respectively corresponding to the plurality of sub-driving units.
3. The constant brightness LED circuit according to claim 2, wherein the control unit comprises a plurality of PWM signal output terminals, and the control unit is respectively connected to the plurality of sub-driving units through the plurality of PWM signal output terminals to respectively output the target driving signals corresponding to the sub-driving units.
4. The constant brightness LED circuit according to claim 2, further comprising a switch unit respectively connected to receive a switch signal to drive the corresponding sub-driving unit to turn on or off;
the control unit is connected with the switch unit and used for generating the switch signal according to the target drive signal of the sub-drive unit.
5. The constant brightness LED circuit according to claim 4, wherein the generating the switching signal according to the target driving signal of the sub-driving unit comprises: when the target drive signal is at a high level, a high-level switching signal is generated, and when the target drive signal is at a low level, a low-level switching signal is generated.
6. The constant brightness LED circuit according to claim 4, wherein the control unit comprises at least one PWM signal output terminal, and the control unit is connected to the plurality of sub-driving units through any PWM signal output terminal to output the target driving signal.
7. The constant brightness LED circuit of claim 3, wherein the switch unit comprises a first switch tube, a first end of the first switch tube is connected to the control unit, a second end of the first switch tube is connected to a first end of the corresponding sub-driving unit via the LED light emitting unit, and a third end of the third switch tube is connected to a power supply voltage.
8. The constant brightness LED circuit according to claim 1, further comprising a first judgment unit;
the first judging unit is connected with the voltage monitoring unit and used for judging whether the real-time voltage is lower than a first preset value or not and driving the control unit to acquire the target PWM duty ratio according to the real-time voltage and the relation list when the real-time voltage is lower than the first preset value.
9. The constant brightness LED circuit according to claim 1, further comprising a second judging unit;
the second judging unit is connected with the voltage monitoring unit and used for judging whether the real-time voltage is lower than a second preset value or not and driving the control unit to turn off the output of the driving signal when the real-time voltage is lower than the second preset value.
10. An electronic device comprising a constant brightness LED circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110546037.4A CN113411932B (en) | 2021-05-19 | 2021-05-19 | Constant brightness LED circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110546037.4A CN113411932B (en) | 2021-05-19 | 2021-05-19 | Constant brightness LED circuit and electronic equipment |
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| CN113411932B CN113411932B (en) | 2023-11-28 |
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Cited By (1)
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| WO2025189891A1 (en) * | 2024-03-13 | 2025-09-18 | 浙江欧菲克斯交通科技有限公司 | Dimming control method and system, and electronic device and storage medium |
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| CN113411932B (en) | 2023-11-28 |
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