CN213694233U - LED constant-brightness adjusting circuit and electronic equipment - Google Patents
LED constant-brightness adjusting circuit and electronic equipment Download PDFInfo
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- CN213694233U CN213694233U CN202022198875.0U CN202022198875U CN213694233U CN 213694233 U CN213694233 U CN 213694233U CN 202022198875 U CN202022198875 U CN 202022198875U CN 213694233 U CN213694233 U CN 213694233U
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Abstract
The application discloses an LED constant brightness adjusting circuit and electronic equipment, wherein the LED constant brightness adjusting circuit comprises at least one light-emitting adjusting module which is sequentially connected in series on a power supply, and the power supply is used for supplying power to the light-emitting adjusting module; each light-emitting adjusting module comprises a light-emitting diode, a control submodule and a feedback submodule; the anode of the light emitting diode is connected with the power supply; the control submodule is respectively connected with the cathode of the light-emitting diode and the feedback submodule; the feedback sub-module is used for stabilizing the currents of the control sub-module and the light-emitting diode when the light-emitting diode is conducted in the forward direction, so that the control sub-module controls the voltage at two ends of the light-emitting diode to be stable.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit and specifically relates to a LED constant brightness adjusting circuit and electronic equipment are related to.
Background
At present, the living standard of people is increasingly improved, various household appliances enter thousands of households, hands are liberated, and life is improved.
At present, most electrical appliances have functions of indicating power and lighting, and usually use Light Emitting Diodes (LEDs). However, in the case of a large number of LEDs, the power consumption of the device is large, the brightness is greatly affected by the amount of power, and the brightness is high when the power is high and is too low when the power is low.
SUMMERY OF THE UTILITY MODEL
The application provides a constant-brightness LED adjusting circuit and electronic equipment.
In a first aspect, an LED constant-brightness adjusting circuit is provided, which includes at least one light-emitting adjusting module serially connected to a power supply in sequence, wherein the power supply is configured to supply power to the light-emitting adjusting module; each light-emitting adjusting module comprises a light-emitting diode, a control submodule and a feedback submodule; the anode of the light emitting diode is connected with the power supply; the control submodule is respectively connected with the cathode of the light-emitting diode and the feedback submodule;
the feedback sub-module is used for stabilizing the currents of the control sub-module and the light-emitting diode when the light-emitting diode is conducted in the forward direction, so that the control sub-module controls the voltage at two ends of the light-emitting diode to be stable.
Optionally, the control sub-module includes a switch unit, and the switch unit is configured to control the forward conduction and the turn-off of the light emitting diode according to an input control signal;
the control submodule further comprises a first current limiting unit, a second current limiting unit and a biasing unit; the switch unit is respectively connected with the first current limiting unit, the second current limiting unit and the bias unit;
the switch unit receives the control signal through the first current limiting unit, and the first current limiting unit is used for controlling the current of the switch unit;
the second current limiting unit is connected with the cathode of the light emitting diode and is used for controlling the current of the switch unit and the light emitting diode;
the bias unit is connected with the feedback submodule and used for adjusting the current of the switch unit.
Optionally, the switch unit includes a triode, a base of the triode is connected to one end of the first current limiting unit and one end of the bias unit, and the other end of the first current limiting unit is connected to the control signal;
a collector of the triode is connected with one end of the second current limiting unit, and the other end of the second current limiting unit is connected with the cathode of the light emitting diode;
and the emitter of the triode is connected with one end of the feedback submodule, and the other end of the bias unit is grounded with the other end of the feedback submodule.
Optionally, the first current limiting unit includes a first resistor, the second current limiting unit includes a second resistor, and the first biasing unit includes a third resistor.
Optionally, the feedback sub-module includes a feedback resistor.
Optionally, the LED constant brightness adjusting circuit further includes a microcontroller, the microcontroller is connected to the control submodule, and the microcontroller is configured to output a control signal to the control submodule to control the on/off of the light emitting diode.
In a second aspect, an electronic device is provided, comprising the LED constant-lighting adjusting circuit according to the first aspect and any possible implementation manner thereof.
The LED constant-brightness adjusting circuit comprises at least one light-emitting adjusting module which is sequentially connected in series on a power supply, wherein the power supply is used for supplying power to the light-emitting adjusting module; each light-emitting adjusting module comprises a light-emitting diode, a control submodule and a feedback submodule; the anode of the light emitting diode is connected with the power supply; the control submodule is respectively connected with the cathode of the light-emitting diode and the feedback submodule; the feedback sub-module is used for stabilizing the currents of the control sub-module and the light-emitting diode when the light-emitting diode is conducted in the forward direction, so that the control sub-module controls the voltage at two ends of the light-emitting diode to be stable, the influence of the power voltage of the circuit on the illumination brightness of the light-emitting diode can be reduced, the illumination brightness when the electric quantity of the equipment is high and the illumination brightness when the electric quantity is low can be kept consistent as much as possible in the equipment, and the cost is low.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
Fig. 1 is a schematic structural diagram of an LED constant brightness adjusting circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another LED constant-brightness adjusting circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another LED constant-brightness adjusting circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another LED constant-brightness adjusting circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a system, product or apparatus that comprises a list of elements, modules is not limited to the elements and modules listed but may alternatively include elements, modules not listed or may alternatively include other elements, modules inherent to such product or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The light emitting diode referred to in the embodiments of the present application is a commonly used light emitting device, emits light by energy released by recombination of electrons and holes, and is widely used in the field of illumination. The light emitting diode can efficiently convert electric energy into light energy, and has wide application in modern society, such as illumination, flat panel display, medical devices and the like.
The embodiments of the present application will be described below with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an LED constant-brightness adjusting circuit according to an embodiment of the present disclosure. The LED constant-brightness adjusting circuit 100 includes at least one light-emitting adjusting module 1 (one light-emitting adjusting module 1 is shown in fig. 1) connected in series to a power supply Vcc, where the power supply Vcc is used to supply power to the light-emitting adjusting module 1; each of the light-emitting adjusting modules 1 comprises a light-emitting diode 2, a control submodule 3 and a feedback submodule 4; the anode of the light emitting diode 2 is connected with the power supply; the control submodule 3 is respectively connected with the cathode of the light-emitting diode 2 and the feedback submodule 4;
the feedback sub-module 4 is configured to stabilize the currents of the control sub-module 3 and the light emitting diode 2 when the light emitting diode 2 is in forward conduction, so that the control sub-module 3 controls the voltage across the light emitting diode 2 to be stable.
The LED constant brightness adjusting circuit 100 in the embodiment of the present application can use the battery as the power supply to supply power, and the power voltage is gradually reduced in the battery discharging process, but because the feedback submodule 4 therein can stabilize the dc working point, the current flowing through the circuit branch is kept stable, so the current flowing through the light emitting diode 2 is also stable, and meanwhile, the control submodule 3 also has the function of voltage adjustment to control the voltage stability at the two ends of the light emitting diode 2.
Optionally, referring to fig. 2, fig. 2 is a schematic structural diagram of another LED constant-brightness adjusting circuit provided in the embodiment of the present application. The LED constant-brightness adjusting circuit 200 includes a light-emitting adjusting module 1 connected in series to a power supply, where the power supply is used to supply power to the light-emitting adjusting module 1; each of the light-emitting adjusting modules 1 comprises a light-emitting diode 2, a control submodule 3 and a feedback submodule 4; the anode of the light emitting diode 2 is connected with the power supply; the control submodule 3 is respectively connected with the cathode of the light-emitting diode 2 and the feedback submodule 4;
the control sub-module 3 includes a switch unit 31, where the switch unit 31 is used to control the forward conduction and turn-off of the light emitting diode 2 according to an input control signal;
the control submodule 3 further includes a first current limiting unit 32, a second current limiting unit 33, and a biasing unit 34; the switching unit 31 is connected to the first current limiting unit 32, the second current limiting unit 33, and the biasing unit 34, respectively;
the switching unit 31 receives the control signal a1 through the first current limiting unit 32, and the first current limiting unit 32 controls the current of the switching unit 31;
the second current limiting unit 33 is connected to a negative electrode of the light emitting diode 2, and the second current limiting unit 33 is configured to control currents of the switching unit 31 and the light emitting diode 2;
the bias unit 34 is connected to the feedback sub-module 4, and the bias unit 34 is used for adjusting the current of the switching unit 31.
The control signal a1 may be a signal output by the microcontroller to control the LED. Optionally, the LED constant-brightness adjusting circuit further includes a microcontroller, the microcontroller is connected to the control submodule, and the microcontroller is configured to output a control signal a1 to the control submodule to control on and off of the light emitting diode 2.
The Microcontroller, i.e., a Micro Control Unit (MCU), also called a Single Chip Microcomputer (Single Chip Microcomputer) or a Single Chip Microcomputer, mentioned in the embodiments of the present application appropriately reduces the frequency and specification of a Central Processing Unit (CPU), and integrates peripheral interfaces such as a memory (memory), a counter (Timer), a USB, an a/D conversion, a UART, a PLC, a DMA, and even an LCD driving circuit on a Single Chip, thereby forming a Chip-level computer.
The switch unit 31 can control the on/off of the current of the light emitting diode 2 to control the on/off of the light emitting diode 2, and the feedback sub-module 4 divides the voltage and stabilizes the current when the light emitting diode 2 is in forward conduction through the control sub-module 3, so that the control sub-module 3 can control the voltage stabilization at the two ends of the light emitting diode 2.
In an alternative embodiment, the switching unit 31 may include a transistor Q1, the first current limiting unit 32 includes a first resistor, the second current limiting unit 33 includes a second resistor, and the first biasing unit 34 includes a third resistor. Wherein the feedback sub-module 4 may comprise a feedback resistor.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another LED constant-brightness adjusting circuit provided in the embodiment of the present application. The LED constant-brightness adjusting circuit 300 includes a light-emitting adjusting module 1 connected in series to a power supply, where the power supply is used to supply power to the light-emitting adjusting module 1; the light-emitting adjusting module 1 comprises a light-emitting diode LED5, a control submodule and a feedback resistor R4; the anode of the light emitting diode LED5 is connected to the power supply; the control submodule is respectively connected with the cathode of the light-emitting diode LED5 and the feedback resistor R4;
the control submodule comprises a triode Q1, a first resistor R1, a second resistor R3 and a third resistor R2;
a base of the transistor Q1 is connected to one end of the first resistor R1 and one end of the third resistor, and the other end of the first resistor R1 is connected to a control signal LED CTR; a collector of the transistor Q1 is connected to one end of the second resistor R3, and the other end of the second resistor R3 is connected to a negative electrode of the light emitting diode LED 5; an emitter of the transistor Q1 is connected to one end of the feedback resistor R4, and the other end of the third resistor R2 is grounded to the other end of the feedback resistor R4.
The triode involved in the embodiment of the application is called a semiconductor triode, also called a bipolar transistor and a transistor, and is a semiconductor device for controlling current. The function of the device is to amplify a weak signal into an electric signal with a large amplitude value, and the device can be used as a contactless switch in the embodiment of the application. Optionally, the transistor in the embodiment of the present application may be an NPN transistor.
In fig. 3, component parameters are exemplarily labeled for part of circuit components, including resistance values of resistors and types of transistors, for example, the resistor R3 is 10k ohms, the transistor Q1 is an NPN-type transistor, and the package is an SOT-23 type chip package, which can be adjusted as needed, and is not limited thereto.
Wherein, R3 is the current-limiting resistor of collecting electrode, mainly is the effect of restriction collecting electrode and LED electric current, can not too big LED and triode of burning out of electric current, and R2 is the biasing resistor, plays balanced and stable effect, and R1 is the base current-limiting resistor, also plays the effect of control base electric current size (and then control the collector electric current size, just so controlled the luminance of LED lamp), can keep triode Q1 to switch on the work.
The feedback resistor R4 can stabilize the dc operating point, so that the collector current of the transistor Q1 is kept stable, and thus the current flowing through the LED5 is also stabilized. In the embodiment of the present application, if the feedback resistor R4 is not provided, the transistor Q1 operates in the on-off state, the transistor Q1 is equivalent to a conducting wire, and all voltages are applied to two ends of the LED lamp (light emitting diode 2). After R4 is added, the triode Q1 works in an amplifying state, at the moment, the triode Q1 is not a conducting wire but a 'voltage divider', the 'voltage divider' is like a sponge, redundant voltage can be absorbed when the voltage is high, too much voltage cannot be absorbed when the voltage is low, and therefore the voltage at two ends of the LED lamp can be guaranteed to be relatively stable.
The LED constant-brightness adjusting circuit in the embodiment of the application can be used for sequentially connecting a plurality of light-emitting adjusting modules in series on a power supply, namely, the lighting effect of a plurality of LED lamps can be realized, so that the lighting brightness can be improved, wherein the structure of each light-emitting adjusting module can be shown as the structure of the light-emitting adjusting module in any one of the embodiments, and meanwhile, the light and the extinguishment of the LED lamps are controlled by control signals in each light-emitting adjusting module. The lighting level can be selected according to the requirement, for example, a plurality of lamps are turned on when the power supply has enough electricity, and only one lamp is turned on when the electricity is low, which is not limited in the embodiment of the present application.
Further, referring to fig. 4, fig. 4 is a schematic structural diagram of another LED constant brightness adjusting circuit provided in the embodiment of the present application. The LED constant-brightness adjusting circuit 400 includes three light-emitting adjusting modules connected in series to the power supply in sequence. Wherein:
the first light-emitting adjusting module comprises a first light-emitting diode LED1, a first triode Q13, a first resistor R38, a second resistor R31, a third resistor R37 and a fourth resistor R32;
an anode of the first light emitting diode LED1 is connected to the power supply;
the base electrode of the first triode Q13 is connected with one end of a first resistor R38, and the other end of the first resistor R38 is connected with a control signal LED CTR 1;
the collector of the first triode Q13 is connected to one end of a second resistor R31, and the other end of the second resistor R31 is connected to the cathode of the first light emitting diode LED 1;
the emitter of the first transistor Q13 is connected to one end of the third resistor R37 and one end of the fourth resistor R32, and the other end of the third resistor R37 and the other end of the fourth resistor R32 are grounded.
The second light-emitting adjusting module comprises a second light-emitting diode LED2, a second triode Q15, a fifth resistor R43, a sixth resistor R35, a seventh resistor R39 and an eighth resistor R36;
an anode of the second light emitting diode LED2 is connected to the power supply;
the base electrode of the second triode Q15 is connected with one end of a fifth resistor R43, and the other end of the fifth resistor R43 is connected to a control signal LED CTR 2;
a collector of the second triode Q15 is connected to one end of a sixth resistor R35, and the other end of the sixth resistor R35 is connected to a cathode of a second light emitting diode LED 2;
an emitter of the second transistor Q15 is connected to one end of the seventh resistor R39 and one end of the eighth resistor R36, and the other end of the seventh resistor R39 and the other end of the eighth resistor R36 are grounded.
The third light-emitting adjusting module comprises a third light-emitting diode LED3, a second triode Q17, a ninth resistor R48, a tenth resistor R41, an eleventh resistor R45 and a twelfth resistor R40;
an anode of the third light emitting diode LED3 is connected to the power supply;
the base electrode of the second triode Q15 is connected with one end of a ninth resistor R48, and the other end of the ninth resistor R48 is connected to a control signal LED CTR 2;
a collector of the second transistor Q15 is connected to one end of a tenth resistor R41, and the other end of the tenth resistor R41 is connected to a cathode of a third light emitting diode LED 3;
an emitter of the second transistor Q15 is connected to one end of an eleventh resistor R45 and one end of a twelfth resistor R40, and the other end of the eleventh resistor R45 and the other end of the twelfth resistor R40 are grounded.
Corresponding parameters are exemplarily labeled for the circuit elements in fig. 4, including resistance values of resistors, such as 2k2 ohms for R31, and 680R for R32, R36, and R40, respectively, which indicate that the resistance values are 680 ohms.
In the embodiment of the present application, in the first light emitting module, the fourth resistor R32 is a feedback resistor, and if there is no fourth resistor R32, the first transistor Q13 operates in the on-off state, which is equivalent to a conducting wire, and all voltages are applied to two ends of the LED 1. After the R32 is added, the first triode Q13 operates in an amplifying state, and at this time, the first triode Q13 is not a conducting wire but a "voltage divider", which is like a sponge, and can absorb excessive voltage when the voltage is high, and can not absorb too much voltage when the voltage is low, so that the voltages at two ends of the LED1 can be relatively stable. In other light emitting modules, the resistors R36 and R40 are provided to have the same function, and are not described herein again.
In the first light emitting module, the second resistor R31 is a collector current-limiting resistor, which mainly limits the current of the collector and the LED, so that the LED and the triode are not burned by excessive current, the third resistor R37 is a bias resistor, which plays a role in balancing and stabilizing, the first resistor R38 is a base current-limiting resistor, which also plays a role in controlling the magnitude of the base current (and further controlling the magnitude of the collector current, thus controlling the brightness of the LED lamp), and the on-state operation of the triode Q1 can be maintained. In other light emitting modules, the corresponding resistors R35, R39, R43 and the resistors R41, R45, R48 have the same function, and are not described herein again.
In the LED constant-lighting adjusting circuit shown in fig. 4, when three LEDs are used as the indicator light circuit, three brightness levels corresponding to different power supply electric quantities, such as three levels of high, medium and low, may be set, and when the electric quantity is enough, 3 lights are lit, when the electric quantity is enough, 2 lights are lit, and when the electric quantity is low, 1 light is lit. Optionally, the LED constant-brightness adjusting circuit further includes a microcontroller, and the microcontroller may output the control signal to control on and off of the light emitting diodes LED1, LED2, and LED 3. Specifically, by presetting a microcontroller software program, the voltage of the battery can be detected by a battery voltage detection circuit, for example, the voltage of each battery is 3V or less, the microcontroller controls the LED to be constantly on to adjust one lamp of a lighting circuit, when the voltage is 3V to 3.7V ", the microcontroller controls the LED to be on two lamps, when the voltage is 3.7V to 4.2V, the microcontroller controls the LED to be on three lamps, and other adjustment modes can be set.
The LED constant-brightness adjusting circuit in the embodiment of the application adds a resistor R32, R36 and R40 for constant-current voltage division in each light emitting module, so that a direct-current working point can be stabilized, corresponding triodes Q13, Q15 and Q17 work in an amplifying state, and when the triode amplifying circuit is in a temperature rise condition and the like, the collector current of the triodes can be kept stable, so that the current flowing through corresponding LEDs is also stabilized. When the electric quantity is enough, namely the voltage is higher, a part of voltage can be added between the collector and the emitter of the triode, so that the voltages at two ends of the LED are kept to be the same, namely, the voltage can absorb redundant voltage when the voltage is high, and too much voltage can not be absorbed when the voltage is low, thereby ensuring that the voltages at two ends of the LED lamp are stable and are not influenced by power supply voltage, and even if the electric quantity of the battery is enough, the brightness is consistent with that when the electric quantity of the battery is lower.
In general, the higher the voltage applied across the LED, the brighter the luminance, the more power is consumed. The LED constant-brightness adjusting circuit in the embodiment of the application can absorb redundant voltage when the power supply is enough in electric quantity, namely the voltage is high, so that abnormal brightness consumption caused by the fact that the voltage at two ends of the LED is high can be relatively avoided, and the service life of a battery can be prolonged.
The embodiment of the present application further provides an electronic device, including an LED constant-brightness adjusting circuit in any embodiment shown in fig. 1-4, which is used for providing an illumination function for the electronic device, and based on the foregoing description, has the effects of stabilizing brightness and saving power consumption when the power supply is full and low. For example, the electronic device may be a vacuum cleaner, wherein the lighting function of the LED constant-brightness adjusting circuit is mainly used for cleaning dark corners, such as scenes of a sofa and a bed bottom, and generally, in these scenes, a strong brightness is required, i.e., the power consumption is larger, the influence of the battery power on the LED brightness is larger, if a dedicated LED control chip is used, although the problem can be solved, the cost of the LED driving chip is higher, and in addition, there is a heating loss when the LDO is used to control the voltage. When the LED constant-brightness adjusting circuit in the embodiment of the application is used, when the power supply is enough in electric quantity, namely, the voltage is high, redundant voltage can be absorbed, so that abnormal brightness consumption caused by the fact that the voltage at two ends of the LED is high can be relatively avoided, and the service time of a battery can be prolonged.
In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. For example, the division of the module is only one logical division, and other divisions may be possible in actual implementation, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. The shown or discussed mutual coupling, direct coupling or communication connection may be an indirect coupling or communication connection of devices or modules through some interfaces, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Claims (7)
1. An LED constant brightness adjusting circuit is characterized by comprising at least one light-emitting adjusting module which is sequentially connected in series with a power supply, wherein the power supply is used for supplying power to the light-emitting adjusting module; each light-emitting adjusting module comprises a light-emitting diode, a control submodule and a feedback submodule; the anode of the light emitting diode is connected with the power supply; the control submodule is respectively connected with the cathode of the light-emitting diode and the feedback submodule;
the feedback sub-module is used for stabilizing the currents of the control sub-module and the light-emitting diode when the light-emitting diode is conducted in the forward direction, so that the control sub-module controls the voltage at two ends of the light-emitting diode to be stable.
2. The LED constant brightness adjusting circuit according to claim 1, wherein the control sub-module comprises a switch unit for controlling the forward conduction and the turn-off of the light emitting diode according to an input control signal;
the control submodule further comprises a first current limiting unit, a second current limiting unit and a biasing unit; the switch unit is respectively connected with the first current limiting unit, the second current limiting unit and the bias unit;
the switch unit receives the control signal through the first current limiting unit, and the first current limiting unit is used for controlling the current of the switch unit;
the second current limiting unit is connected with the cathode of the light emitting diode and is used for controlling the current of the switch unit and the light emitting diode;
the bias unit is connected with the feedback submodule and used for adjusting the current of the switch unit.
3. The LED constant brightness adjusting circuit according to claim 2, wherein the switching unit comprises a triode, a base of the triode is connected with one end of the first current limiting unit and one end of the biasing unit, and the other end of the first current limiting unit is connected to the control signal;
a collector of the triode is connected with one end of the second current limiting unit, and the other end of the second current limiting unit is connected with the cathode of the light emitting diode;
and the emitter of the triode is connected with one end of the feedback submodule, and the other end of the bias unit is grounded with the other end of the feedback submodule.
4. The LED constant brightness adjustment circuit of claim 2, wherein the first current limiting unit comprises a first resistor, the second current limiting unit comprises a second resistor, and the biasing unit comprises a third resistor.
5. The LED constant brightness adjustment circuit of claim 4, wherein the feedback sub-module comprises a feedback resistor.
6. The LED constant brightness adjusting circuit according to any one of claims 1-5, further comprising a microcontroller, wherein the microcontroller is connected to the control sub-module, and the microcontroller is configured to output a control signal to the control sub-module to control on/off of the LED.
7. An electronic device characterized by comprising the LED constant brightness adjustment circuit according to any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022198875.0U CN213694233U (en) | 2020-09-29 | 2020-09-29 | LED constant-brightness adjusting circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022198875.0U CN213694233U (en) | 2020-09-29 | 2020-09-29 | LED constant-brightness adjusting circuit and electronic equipment |
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| CN213694233U true CN213694233U (en) | 2021-07-13 |
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