Multipath light-emitting constant-current control circuit
By using a multi-channel light-emitting constant current control circuit with a microprocessor and an analog switch controller, the problems of circuit complexity and high cost in the prior art are solved, and circuit simplification, miniaturization and improved brightness uniformity are achieved.
Patent Information
- Application Number
- CN202422968621.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-03
AI Technical Summary
In the existing technology, the constant current control circuit of multi-channel light-emitting devices requires multiple independent modules, resulting in complex peripheral circuits, high cost, and difficulty in miniaturization.
A microprocessor and an analog switch controller are used. By cooperating with a constant current control tube and a comparator, constant current control of multiple light-emitting devices can be achieved, simplifying the circuit structure.
It reduces circuit costs, enables circuit miniaturization, improves brightness uniformity, reduces power consumption and response time, and enhances the flexibility of current adjustment.
Smart Images
Figure CN223666514U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to circuit technical field, especially a kind of multi-path light-emitting constant current control circuit. BACKGROUND
[0002] In prior art, one light-emitting device uses one independent constant current control circuit module, one control module circuit uses one set of constant current control circuit and one independent reference potential regulating control circuit, and a microprocessor is needed for conversion circuit, when multi-path combination is needed, peripheral circuit is complex, miniaturization is limited, assembly manufacturing efficiency is low, and cost is high.
[0003] The present application can simplify multi-path light-emitting constant current circuit, control structure flexibly, and constant current value of branch can be set individually, circuit uses less devices, reduces cost, simplifies circuit, and can be miniaturized. SUMMARY
[0004] This section aims to outline some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the present application.
[0005] In view of the above or the problems existing in the prior art, the present application is proposed.
[0006] Therefore, the purpose of the present application is to provide a multi-path light-emitting constant current control circuit, which only needs to use one microprocessor to complete the control of multi-path light-emitting constant current with one set of constant current comparison circuit and one analog switch control device.
[0007] To solve the above technical problems, the present application provides the following technical scheme: a multi-path light-emitting constant current control circuit, which includes a control module, a controller, the controller receives instructions from the processor and controls the on-off of up to N light-emitting devices LED j , and N is a natural number greater than or equal to 2, j={1,…,N};a constant current module, which controls the constant current of N light-emitting devices LED j through constant current control tube and comparator.
[0008] As a preferred scheme of the multi-path light-emitting constant current control circuit of the present application, the controller includes i groups of control ports A0-A i-1 , and also includes an analog switch port Z and an output port Y j connected to one end of the light-emitting device LED k; Wherein, i is a natural number greater than or equal to 1, N = 2^i, and k = j-1;Control port A0, A1 and A2 are connected with the processor.
[0009] As a preferred scheme of the multi-channel light-emitting constant current control circuit, the controller receives a 5V power supply voltage through the VDD port and is grounded through the VSS port.
[0010] As a preferred scheme of the multi-channel light-emitting constant current control circuit, the other end of the light-emitting element is connected to the collector of the constant current control tube after being combined; the emitter of the constant current control tube is connected to the negative electrode of the comparator through a sampling resistor; the base of the constant current control tube is connected to the output end of the comparator.
[0011] As a preferred scheme of the multi-channel light-emitting constant current control circuit, the positive electrode of the comparator is connected to the analog switch port Z of the controller.
[0012] As a preferred scheme of the multi-channel light-emitting constant current control circuit, the negative electrode of the comparator is grounded, and the emitter of the constant current control tube is grounded.
[0013] As a preferred scheme of the multi-channel light-emitting constant current control circuit, the emitter of the constant current control tube is also connected to the inverting input end of the comparator, and the non-inverting input end of the comparator is connected to the DAC port of the processor.
[0014] As a preferred scheme of the multi-channel light-emitting constant current control circuit, a protection resistor is further arranged between the output end of the comparator and the base of the constant current control tube.
[0015] The multi-channel light-emitting constant current control circuit has the following beneficial effects: the control of the overall circuit light-emitting is completed by using one processor and one analog switch controller, the high and low levels output by the comparison between the sampling voltage of the comparator and the rated voltage setting value of the processor are compared, and the constant current control tube is turned off and turned on, thereby realizing constant current control. The overall circuit uses few devices, simplifies the circuit, reduces the cost, and miniaturizes the circuit. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor. Among them:
[0017] Figure 1 It is the overall circuit diagram of the multi-channel light-emitting constant current control circuit. DETAILED DESCRIPTION
[0018] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings of the specification.
[0019] In the following description, a large number of specific details are set forth in order to facilitate a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the utility model, therefore the utility model is not limited by the specific embodiments disclosed below.
[0020] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the utility model. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent or alternative to other embodiments.
[0021] Embodiment 1
[0022] Reference Figure 1 For the first embodiment of the utility model, the embodiment provides a multi-channel light-emitting constant-current control circuit, which comprises a control module 100, including a controller U1, the controller U1 receives instructions of a processor U3, and simultaneously controls the on-off of at most N light-emitting elements LED j , and N is a natural number greater than or equal to 2, j = {1,..., N}; a constant-current module 200 controls the constant current of N light-emitting elements LED j through a constant-current control tube Q1 and a comparator U2.
[0023] In terms of control: first, the processor U3 is programmed to set the power supply for the light-emitting element LEDj, and second, the controller U1 controls the on-off of the light-emitting element LEDj that needs to emit light after receiving the processor U3 signal through the control port.
[0024] In terms of constant current: after the comparator U2 receives the sampling voltage, it compares with the set value of the processor U3 and outputs high and low levels to the constant-current control tube Q1, so that the constant-current control tube Q1 is closed and turned on, thereby achieving constant current control of the light-emitting element LEDj.
[0025] In summary, the multi-channel light-emitting constant-current control circuit has the beneficial effect of adding a processor MCU in the control circuit, which simplifies the multiple constant-current control circuit modules in the multi-channel light-emitting element circuit, and the simplified circuit uses fewer devices, not only reducing the cost, but also making the circuit smaller.
[0026] Embodiment 2
[0027] ReferenceFigure 1 , the second embodiment of the utility model, unlike last embodiment, this embodiment provides a multi-path light emitting constant current control circuit, it includes, the controller U1 includes i group control port A0~A i-1 , and the light emitting part LED j The output port Y k connected at one end. Wherein, i is the natural number greater than or equal to 1, N=2^i, and k=j-1;Control port A0, A1 and A2 are connected with processor U3.
[0028] Further, the controller U1 receives 5V power supply voltage through VDD port, and is grounded through VSS port.
[0029] Further, the light emitting part LEDj other end is merged and then accessed to the collector of constant current control tube Q1;The emitter of constant current control tube Q1 is connected with the negative pole of comparator U2 through sampling resistor R2;The base of constant current control tube Q1 is connected with the output end of comparator U2.
[0030] Further, the positive pole of comparator U2 is connected with the analog switch port Z of controller U1.
[0031] Further, the negative pole of comparator U2 is grounded, and the emitter of constant current control tube Q1 is grounded.
[0032] When the control circuit is used, the controller U1 controls the on-off of the output port Y i-1 And analog switch port Z through i group control port A0~A k .
[0033] It should be explained that three groups of control ports are provided in the embodiment, for control port A0, A1 and A2, that is, i is 3, so that the N light emitting parts LED j mentioned, because N=2^i, so N=8, that is, three control ports A0~A i-1 Can control eight light emitting parts LED j At most.In the embodiment, j={1,...,N}, j takes the maximum value 8, that is, the light emitting part LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, because k=j-1, so the output port Y k It is output port Y0, Y1, Y2, Y3, Y4, Y5, Y76 and Y7 respectively.
[0034] When the control port A0A1A2=000, analog switch port Z and output port Y0 are in the on state, the controller U1 power supply through the analog switch port Z-Y0 supply light emitting tube LED1, through the constant current control tube Q1, and then through the sampling resistor R2 and the comparator U2, the power supply circuit of which the light emitting tube LED1 is formed.
[0035] The following table is three groups of control port A0, A1 and A2 can control the on-off situation:
[0036] Table 1
[0037]
[0038] Example 3
[0039] Referring to Figure 1 , the third embodiment of the utility model, different from the last example, this embodiment provides a multi-channel light emitting constant current control circuit, which includes the emitter of the constant current control tube Q1 is also connected with the inverting input terminal of the comparator U2, the noninverting input terminal of the comparator U2 is connected with the DAC port of the processor U3.
[0040] Further, the output terminal of the comparator U2 and the base of the constant current control tube Q1 are also provided with a protection resistor R.
[0041] It should be noted that in the circuit, the processor U3 uses MCU software programming to set the constant current value and the rated voltage value.
[0042] When the constant current circuit is used, the sampling resistor R2 will receive the sampling voltage from the constant current control tube Q1 and send it to the inverting input terminal of the comparator U2, at this time the noninverting input terminal of the comparator U2 has the rated voltage set by the processor U3, the comparator U2 compares the sampling voltage with the rated voltage, when the sampling voltage is higher than the rated voltage, the comparator U2 outputs low level, so that the constant current control tube Q1 is closed, after the constant current control tube Q1 is closed, no current flows through the sampling resistor R2, the sampling voltage of the sampling resistor R2 becomes zero, so that the sampling voltage of the inverting input terminal of the comparator U2 is lower than the rated voltage set by the noninverting input terminal of the comparator U2, the comparator U2 outputs high level, so that the constant current control tube Q1 is turned on, thereby achieving constant current control.
[0043] It should be noted that in the circuit, the constant current value depends on the value of the DAC (digital to analog conversion) from the processor U3, which can be set by MCU software programming.
[0044] Example 4
[0045] Referring to Figure 1For the third embodiment of the present utility model, in this experiment, according to the specification and lighting needs of LED, we set the output voltage of the DAC end of the processor U3 to 1.1V, which corresponds to a constant current value of 350mA, and the rated voltage value is set to 3.3V.
[0046] Still take the setting control port A0, A1 and A2, the light emitting element LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8, because k = j-1, the output port Y0, Y1, Y2, Y3, Y4, Y5, Y76 and Y7.
[0047] In the experimental process, we recorded the brightness, power consumption and response time of each group of LED, and especially recorded the changes after adjusting the current through the software. In order to compare, we also used the traditional multi-circuit and the circuit of the present invention at the same time to ensure the accuracy and comparability of the data.
[0048]
[0049] Through the comparison of experimental data, we can obviously see the advantages of the present invention when there are eight groups of circuits. First of all, in terms of brightness, the brightness of LED1 to LED8 of the present invention is higher than that of the prior art, and the brightness is more uniform, which shows that the cooperation of constant current control tube Q1 and comparator U2 can control the current more effectively, thereby providing more stable brightness output.
[0050] Secondly, in terms of power consumption, the power consumption of the present invention is 1200mW, which is significantly lower than 1600mW of the prior art, further proving that the precise cooperation of constant current control tube Q1 and comparator U2 can adjust the current in real time to maintain constant brightness and reduce energy waste.
[0051] Finally, in terms of response time, the response time of the present invention is 100ms, which is much lower than 160ms of the prior art. This improvement benefits from the design of i group control ports A0~A i-1 And analog switch port Z of controller U1, which can quickly respond to the instructions of processor U3 to realize the on-off control of N light emitting elements LEDj.
[0052] The data of current adjustment times show that the circuit of the present invention allows more current adjustment, which further proves that after the parameters are set by MCU software programming, the processor U3 has flexibility and simplicity in adjusting the current of each LED, thereby realizing the simplification of the design of peripheral circuit.
[0053] In summary, the present application is superior to the prior art in terms of brightness uniformity, power consumption, response time and flexibility of current adjustment, and shows obvious innovation and advantages. These data not only prove the technical feasibility of the present application, but also further verify the superior performance of the present application in processing more complex circuits, especially the advantages in software control and simplification of peripheral circuits.
[0054] Importantly, it should be noted that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in the application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such variations are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be varied or re-sequenced without materially affecting the application. Any "means plus function" clauses are intended to cover the structures described herein as performing the recited functionality and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present application. Accordingly, the present application is not limited to the particular embodiments described in the specification, but extends to any embodiments that would fall within the scope of the appended claims.
[0055] Furthermore, in the interests of providing a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those unrelated to the best mode of practicing the present application, or those unrelated to enabling the present application).
[0056] It should be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.
[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.
Claims
1. A multiple light emitting constant current control circuit, characterized by: Comprising, A control module (100) comprising a controller (U1) receiving instructions from a processor (U3) and simultaneously controlling the on-off of up to N light emitting elements (LED j ) with N being a natural number greater than or equal to 2, j = {1, …, N}. Constant current module (200) controls the constant current of N light emitting elements (LED j ) through constant current control tube (Q1) and comparator (U2).
2. The multi-channel light emitting constant current control circuit according to claim 1, wherein: The controller (U1) comprises i group of control ports A0~A i-1 , analog switch port Z, and output port Y j connected with one end of the light emitting element (LED k ). wherein i is a natural number greater than or equal to 1, N = 2^i, and k = j-1; The control ports A0, A1 and A2 are connected to the processor (U3).
3. The multiple light emitting constant current control circuit according to claim 2, wherein: The controller (U1) receives a 5V power supply voltage through the VDD port and is grounded through the VSS port.
4. The multiple light emitting constant current control circuit according to claim 3, wherein: The other end of the light emitting element (LEDj) is connected to the collector of the constant current control tube (Q1) after being combined; The emitter of the constant current control tube (Q1) is connected to the negative electrode of the comparator (U2) through the sampling resistor (R2); The base of the constant current control tube (Q1) is connected to the output of the comparator (U2).
5. The multiple light emitting constant current control circuit according to claim 4, wherein: The positive electrode of the comparator (U2) is connected to the analog switch port Z of the controller (U1).
6. The multiple light emitting constant current control circuit according to claim 5, wherein: The negative electrode of the comparator (U2) is grounded, and the emitter of the constant current control tube (Q1) is also grounded.
7. The multiple light emitting constant current control circuit according to claim 6, wherein: The emitter of the constant current control tube (Q1) is also connected to the inverting input of the comparator (U2), and the non-inverting input of the comparator (U2) is connected to the DAC port of the processor (U3).
8. The multiple light emitting constant current control circuit according to claim 7, wherein: The output of the comparator (U2) and the base of the constant current control tube (Q1) are also provided with a protection resistor (R1).