LED lamp group capable of accurately controlling color temperature

Abstract

The invention relates to an LED lamp set capable of accurately controlling color temperature. The LED lamp set comprises two kinds of LED lamp strings displaying different color temperatures, the two LED lamp strings are electrically connected with a plurality of control circuits, the control circuits are controlled through a plurality of I / O ports, the control circuits control conduction of the positive electrodes and the negative electrodes of the LED lamp strings, and each control circuit can change the magnitude of current flowing through the LED lamp strings when controlling conduction of the positive electrodes and the negative electrodes of the LED lamp strings. Therefore, the color temperatures with different intensities are mixed, and the LED lamp group is accurately controlled to display various color temperatures through the I / O port.

Description

Technical Field

[0001] This application relates to the technical field of color temperature control, and particularly to an LED lamp group capable of precisely controlling the color temperature. Background Art

[0002] Nowadays, the application of LED lights is becoming increasingly widespread, ranging from large billboards, neon lights, and LED displays to small lighting lights, indicator lights, etc., playing a significant role in the fields of lighting, industry, traffic indication, etc.

[0003] Among them, using LED lights for color temperature adjustment is a widespread use of LED lights. In related technologies, a single-chip microcomputer is usually used to output the I / O port of the PWM wave or analog level to apply different magnitudes of current to the LED lights, thereby achieving the control of the color temperature of the LED lights. In related technologies, controlling the normally open or normally closed states of LED light strings with different color temperatures through the I / O port of the single-chip microcomputer cannot precisely control each color temperature. When two LED light strings are conducted simultaneously, due to the absence of an adjustment circuit, the color temperature will show a natural mixing result and cannot be precisely controlled. Summary of the Invention

[0004] To solve or partially solve the problems existing in related technologies, this application provides an LED lamp group capable of precisely controlling the color temperature, which can precisely control the combination of two LED light strings to display multiple color temperatures.

[0005] In the first aspect of this application, an LED lamp group capable of precisely controlling the color temperature is provided. The LED lamp group is controlled through the I / O port of a single-chip microcomputer. The LED lamp group at least includes a first LED light string, a second LED light string, a first control circuit, a second control circuit, a third control circuit, and a fourth control circuit; The input end of the first LED light string is electrically connected to the positive pole of the power supply, and the output end is electrically connected to the current input ends of the second control circuit and the fourth control circuit; The input end of the second LED light string is electrically connected to the positive pole of the power supply, and the output end is electrically connected to the current input ends of the first control circuit and the third control circuit; The output ends of the first control circuit, the second control circuit, the third control circuit, and the fourth control circuit are electrically connected to the negative pole of the power supply; The signal input ends of the first control circuit, the second control circuit, the third control circuit, and the fourth control circuit are respectively electrically connected to the I / O port; Among them, the second control circuit and the fourth control circuit are used to control the conduction of the positive and negative poles of the first LED light string, and the first control circuit and the third control circuit are used to control the conduction of the positive and negative poles of the second LED light string.

[0006] As an implementation of the first aspect of this application, the circuit structures of the first LED light string and the second LED light string are the same, and both are connected in series with multiple LED lights; Among them, the first LED light string and the second LED light string respectively display the color temperatures of two colors; The first LED light string and the second LED light string are used to display different intensities of color temperature according to the current after conduction when the positive and negative poles are conducted.

[0007] As an implementation of the first aspect of this application, the second control circuit and the fourth control circuit are used to control the conduction of the positive and negative poles of the first LED light string according to the control signal sent by the I / O port; The first control circuit and the third control circuit are used to control the conduction of the positive and negative poles of the second LED light string according to the control signal sent by the I / O port.

[0008] As an implementation of the first aspect of this application, the circuit structures of the first control circuit and the second control circuit are the same, and at least include: a protection resistor and a MOS transistor; One end of the protection resistor is electrically connected to the gate of the MOS transistor, and the other end is electrically connected to the negative pole of the power supply; The gate of the MOS transistor is electrically connected to the output end of the single-chip microcomputer I / O port, the source of the MOS transistor is electrically connected to the negative pole of the power supply, and the drain of the MOS transistor is electrically connected to the output end of the LED light string; As an implementation of the first aspect of this application, the circuit structures of the third control circuit and the fourth control circuit are the same, and at least include: a protection resistor, a current-limiting resistor, and a MOS transistor; One end of the protection resistor is electrically connected to the gate of the MOS transistor, and the other end is electrically connected to the negative pole of the power supply; The gate of the MOS transistor is electrically connected to the output end of the single-chip microcomputer I / O port, and the source of the MOS transistor is electrically connected to the negative pole of the power supply; One end of the current-limiting resistor is electrically connected to the drain of the MOS transistor, and the other end is electrically connected to the output end of the LED light string.

[0009] As an implementation of the first aspect of this application, in the LED lamp group, a first driving circuit, a second driving circuit, and an adjusting circuit are further included; The input end of the first driving circuit is electrically connected to the signal input end of the third control circuit through the same I / O port, and the output end is electrically connected to the signal input end of the adjusting circuit; The input end of the second driving circuit is electrically connected to the signal input end of the fourth control circuit through the same I / O port, and the output end is electrically connected to the signal input end of the adjusting circuit; The current input terminal of the adjustment circuit is electrically connected to the output terminal of the second LED lamp string, and the output terminal is electrically connected to the negative electrode of the power supply.

[0010] As an implementation manner of the first aspect of the present application, when the first driving circuit and the second driving circuit simultaneously receive a control signal, the first driving circuit, the second driving circuit, and the adjustment circuit are used to drive the adjustment circuit to adjust the current of the second LED lamp string in the conducting state.

[0011] As an implementation manner of the first aspect of the present application, the first driving circuit and the second driving circuit have the same circuit structure, and at least include: an emitter resistor, a base resistor, a diode, and a triode; One end of the emitter resistor is electrically connected to the I / O port, and the other end is electrically connected to the emitter of the triode; One end of the base resistor is electrically connected to the negative electrode of the power supply, and the other end is electrically connected to the base of the triode; The negative electrode of the diode is electrically connected to the emitter of the triode, and the positive electrode of the diode is electrically connected to the collector of the triode; The collector of the triode is the output terminal of the driving circuit.

[0012] As an implementation manner of the first aspect of the present application, the adjustment circuit includes a protection resistor, a current limiting resistor, and a MOS tube; One end of the protection resistor is electrically connected to the output terminals of the first driving circuit and the second driving circuit, and the other end is electrically connected to the negative electrode of the power supply; One end of the current limiting resistor is electrically connected to the output terminal of the second LED lamp string, and the other end is electrically connected to the drain of the MOS tube; The gate of the MOS tube is electrically connected to the output terminals of the first driving circuit and the second driving circuit, and the source of the MOS tube is electrically connected to the negative electrode of the power supply.

[0013] The second aspect of the present application provides an LED lamp group color temperature control method, which is applied to the LED lamp group proposed in the first aspect of the present application, and at least includes: The single-chip microcomputer I / O port sends a control signal; After receiving the control signal, the control circuit controls the corresponding control circuit to conduct; Wherein, the control circuit includes the first control circuit, the second control circuit, the third control circuit, and the fourth control circuit; After receiving the control signal, the first driving circuit and / or the second driving circuit judges whether it is necessary to conduct the adjustment circuit; After the current magnitude on the LED lamp group is adjusted by the control circuit and the adjustment circuit, the LED lamp group displays the color temperature according to the current magnitude.

[0014] The technical solution provided by this application may include the following beneficial effects: By using two groups of LED lamp strings to connect multiple control circuits, controlling the control circuits through multiple I / O ports, and controlling the conduction of the positive and negative poles of the LED lamp strings by the control circuits. When each control circuit controls the conduction of the positive and negative poles of the LED lamp strings, it will change the magnitude of the current flowing through the LED lamp strings, so as to mix color temperatures of different intensities and achieve precise control of the LED lamp group to display multiple color temperatures through the I / O ports.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the exemplary embodiments of this application in more detail in conjunction with the accompanying drawings, the above and other objects, features, and advantages of this application will become more obvious. Among them, in the exemplary embodiments of this application, the same reference numerals generally represent the same components.

[0017] Figure 1 is a schematic structural diagram of the LED lamp group shown in the embodiments of this application; Figure 2 is a schematic circuit diagram of the LED lamp group shown in the embodiments of this application; Figure 3 is a schematic flowchart of the color temperature control method for the LED lamp group shown in the embodiments of this application; Symbol description: 1 - First LED lamp string; 2 - Second LED lamp string; 3 - First control circuit; 4 - Second control circuit; 5 - Third control circuit; 6 - Fourth control circuit; 7 - First I / O port; 8 - Second I / O port; 9 - Third I / O port; 10 - Fourth I / O port; 11 - First drive circuit; 12 - Second drive circuit; 13 - Positive power supply; 14 - Negative power supply; 15 - Adjustment circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The embodiments of this application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make this application more thorough and complete, and to be able to fully convey the scope of this application to those skilled in the art.

[0019] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0020] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless otherwise specifically defined.

[0021] In view of the above problems, the embodiments of this application provide an LED lamp group capable of precisely controlling the color temperature, which can precisely control the combined display of two LED lamp strings to show at least four color temperatures.

[0022] The embodiments of this application provide an LED lamp group capable of precisely controlling the color temperature. The LED lamp group is controlled through the I / O ports of a single-chip microcomputer. The LED lamp group at least includes a first LED lamp string 1, a second LED lamp string 2, a first control circuit 3, a second control circuit 4, a third control circuit 5, and a fourth control circuit 6. The connection structure of the LED lamp group is as Figure 1 shown.

[0023] The input end of the first LED lamp string 1 is electrically connected to the positive electrode 13 of the power supply, and the output end is electrically connected to the current input ends of the second control circuit 4 and the fourth control circuit 6.

[0024] The input end of the second LED lamp string 2 is electrically connected to the positive electrode 13 of the power supply, and the output end is electrically connected to the current input ends of the first control circuit 3 and the third control circuit 5.

[0025] The output ends of the first control circuit 3, the second control circuit 4, the third control circuit 5, and the fourth control circuit 6 are electrically connected to the negative electrode 14 of the power supply.

[0026] The signal input ends of the first control circuit 3, the second control circuit 4, the third control circuit 5, and the fourth control circuit 6 are respectively electrically connected to the I / O ports.

[0027] Specifically, the signal input terminal of the first control circuit 3 is electrically connected to the first I / O port 7, the signal input terminal of the second control circuit 4 is electrically connected to the second I / O port 8, the signal input terminal of the third control circuit 5 is electrically connected to the third I / O port 9, and the signal input terminal of the fourth control circuit 6 is electrically connected to the fourth I / O port 10.

[0028] Among them, the second control circuit 4 and the fourth control circuit 6 are used to control the conduction of the positive and negative poles of the first LED light string 1, and the first control circuit 3 and the third control circuit 5 are used to control the conduction of the positive and negative poles of the second LED light string 2.

[0029] Specifically, when the first LED light string 1 is conducting, it is only controlled to conduct through the second control circuit 4 or the fourth control circuit 6, and the second control circuit 4 and the fourth control circuit 6 cannot control the first LED light string 1 to conduct simultaneously. When the second LED light string 2 is conducting, it is only controlled to conduct through the first control circuit 3 or the third control circuit 5, and the first control circuit 3 and the third control circuit 5 cannot control the second LED light string 2 to conduct simultaneously.

[0030] When the second control circuit 4 controls the first LED light string 1 to conduct, the current on the first LED light string 1 is different from that when the fourth control circuit 6 controls the conduction, so as to control the first LED light string 1 to display two different intensities of color temperature.

[0031] When the first control circuit 3 controls the second LED light string 2 to conduct, the current on the second LED light string 2 is different from that when the third control circuit 5 controls the conduction, so as to control the second LED light string 2 to display two different intensities of color temperature.

[0032] In this embodiment, by using two groups of LED light strings connected to multiple control circuits, the control circuits are controlled through multiple I / O ports. The control circuits control the conduction of the positive and negative poles of the LED light strings. Each control circuit will change the magnitude of the current flowing through the LED light string when controlling the conduction of the positive and negative poles of the LED light string, so as to mix different intensities of color temperature and achieve precise control of the LED light group to display multiple color temperatures through the I / O ports.

[0033] In the embodiment of the present application, the circuit structures of the first LED light string 1 and the second LED light string 2 are the same, and multiple LEDs are connected in series.

[0034] Among them, the first LED light string 1 and the second LED light string 2 respectively display two colors of color temperature.

[0035] The first LED light string 1 and the second LED light string 2 are used to display different intensities of color temperature according to the current after conduction when the positive and negative poles are conducting.

[0036] In this embodiment, the circuit structures of the first LED string 1 and the second LED string 2 are the same, which simplifies the circuit design and manufacturing process, reduces the production cost, and improves the reliability and maintenance convenience of the LED lamp group. At the same time, by controlling the conduction state of the LED string, the dynamic adjustment of the color temperature can be realized, enhancing the flexibility and adaptability of the color temperature display of the LED lamp group. In the embodiment of the present application, the second control circuit 4 and the fourth control circuit 6 are used to control the conduction of the positive and negative poles of the first LED string 1 according to the control signal sent by the I / O port.

[0037] The first control circuit 3 and the third control circuit 5 are used to control the conduction of the positive and negative poles of the second LED string 2 according to the control signal sent by the I / O port.

[0038] Among them, when the second control circuit 4 is conducting, the current on the first LED string 1 is different from the current when the fourth control circuit 6 is conducting. When the first control circuit 3 is conducting, the current on the second LED string 2 is different from the current when the third control circuit 5 is conducting.

[0039] In this embodiment, the control signal sent by the I / O port is used to control different control circuits to conduct, thereby changing the current on the LED string and realizing the control of the color temperature intensity displayed by the LED string.

[0040] In the embodiment of the present application, the circuit structures of the first control circuit 3 and the second control circuit 4 are the same, and at least include a protection resistor and a MOS transistor. The circuit structures of the first control circuit and the second control circuit are as Figure 2 shown.

[0041] One end of the protection resistor is electrically connected to the gate of the MOS transistor, and the other end is electrically connected to the negative power supply 14.

[0042] Among them, the protection resistor of the first control circuit 3 is Figure 2 represented as R1 in Figure 2 i.e., the protection resistor R1, and the protection resistor of the second control circuit 4 is

[0043] represented as R2 in

[0044] i.e., the protection resistor R2.

[0045] The protection resistors R1 and R2 are used to prevent the first control circuit 3 and the second control circuit 4 from being mis-conducted, avoiding mis-conduction of the circuit caused by unstable voltage and causing the LED string to flicker.

[0044] The gate of the MOS transistor is electrically connected to the output end of the I / O port, the source of the MOS transistor is electrically connected to the negative power supply 14, and the drain of the MOS transistor is electrically connected to the output end of the LED string.

[0045] Among them, the MOS transistor of the first control circuit 3 is Figure 2 represented as Q1 inFigure 2 It is represented as Q2 in Figure 2 , that is, MOS transistor Q2.

[0046] Specifically, when the first I / O port 7 outputs a high level, the MOS transistor Q1 of the first control circuit 3 conducts, making the positive and negative poles of the second LED string 2 conduct, emitting the second color temperature with normal intensity. When the second I / O port 8 outputs a high level, the MOS transistor Q2 of the second control circuit 4 conducts, making the positive and negative poles of the first LED string 1 conduct, emitting the first color temperature with normal intensity.

[0047] In this embodiment, through the reasonable design of the protection resistor and the MOS transistor, it effectively prevents the mis-conduction of the circuit caused by unstable voltage, improves the stability of the circuit. At the same time, through the independent control of the LED string by the I / O port, it realizes that the LED lamp group can display two different color temperatures, and simplifies the design and manufacturing process through a unified circuit structure, reducing the production cost of the LED lamp group.

[0048] In the embodiment of the present application, the circuit structures of the third control circuit 5 and the fourth control circuit 6 are the same, and at least include: a protection resistor, a current-limiting resistor, and a MOS transistor. The circuit structures of the third control circuit and the fourth control circuit are as Figure 2 shown.

[0049] One end of the protection resistor is electrically connected to the gate of the MOS transistor, and the other end is electrically connected to the negative pole 14 of the power supply.

[0050] Among them, the protection resistor of the third control circuit 5 is represented as R3 in Figure 2 Figure 2 , that is, protection resistor R3. The protection resistor of the fourth control circuit 6 is represented as R4 in Figure 2 Figure 2 , that is, protection resistor R4.

[0051] The protection resistor R3 and the protection resistor R4 are used to prevent the mis-conduction of the third control circuit 5 and the fourth control circuit 6, and avoid the mis-conduction of the circuit caused by unstable voltage, so that the LED string flickers.

[0052] The gate of the MOS transistor is electrically connected to the output end of the single-chip microcomputer I / O port, and the source of the MOS transistor is electrically connected to the negative pole 14 of the power supply.

[0053] Among them, the MOS transistor of the third control circuit 5 is represented as Q3 in Figure 2 Figure 2 , that is, MOS transistor Q3. The MOS transistor of the fourth control circuit 6 is represented as Q4 in Figure 2 Figure 2 , that is, MOS transistor Q4.

[0054] One end of the current-limiting resistor is electrically connected to the drain of the MOS transistor, and the other end is electrically connected to the output end of the LED string.

[0055] Among them, the current-limiting resistor of the third control circuit 5 is in Figure 2It is represented as R7 in [the text], that is, the current-limiting resistor R7. The current-limiting resistor of the fourth control circuit 6 is in Figure 2 It is represented as R8 in [the text], that is, the current-limiting resistor R8.

[0056] Specifically, when the first I / O port 7 and the fourth I / O port 10 output high levels simultaneously, the MOS transistor Q1 of the first control circuit 3 conducts, making the positive and negative poles of the second LED string 2 conduct, emitting the second color temperature with normal intensity. At the same time, the MOS transistor Q4 of the fourth control circuit 6 conducts, making the positive and negative poles of the first LED string 1 conduct. The first LED string 1 and the second LED string 2 are then connected in parallel between the positive and negative poles of the power supply. According to the principle of parallel current shunting, due to the existence of the current-limiting resistor R8, the current on the second LED string 2 is greater than the current on the first LED string 1, and the color temperature intensity emitted by the second LED string 2 is also greater than the color temperature intensity emitted by the first LED string 1. Thus, a third color temperature close to the second color temperature is mixed.

[0057] Among them, the third color temperature can be adjusted by adjusting the value of the current-limiting resistor R8. The larger the value of the current-limiting resistor R8, the smaller the current on the first LED string 1. The third color temperature is closer to the second color temperature. On the contrary, the smaller the value of the current-limiting resistor R8, the larger the current of the first LED string 1, and the third color temperature is closer to the first color temperature.

[0058] When the second I / O port 8 and the third I / O port 9 output high levels simultaneously, the MOS transistor Q2 of the second control circuit 4 conducts, making the positive and negative poles of the first LED string 1 conduct, emitting the first color temperature with normal intensity. At the same time, the MOS transistor Q3 of the third control circuit 5 conducts, making the positive and negative poles of the second LED string 2 conduct. The first LED string 1 and the second LED string 2 are then connected in parallel between the positive and negative poles of the power supply. According to the principle of parallel current shunting, due to the existence of the current-limiting resistor R7, the current on the first LED string 1 is greater than the current on the second LED string 2, and the color temperature intensity emitted by the first LED string 1 is also greater than the color temperature intensity emitted by the second LED string 2. Thus, a fourth color temperature close to the first color temperature is mixed.

[0059] Among them, the fourth color temperature can be adjusted by adjusting the value of the current-limiting resistor R7. The larger the value of the current-limiting resistor R7, the smaller the current of the second LED string 2. The fourth color temperature is closer to the first color temperature. On the contrary, the smaller the value of the current-limiting resistor R7, the larger the current of the second LED string 2, and the fourth color temperature is closer to the second color temperature.

[0060] In this embodiment, through the reasonable design of the protection resistor and the MOS transistor, the circuit misconnection caused by unstable voltage during the operation of the LED lamp group is effectively prevented, improving the stability of the circuit and the reliability of the components. At the same time, through the current-limiting resistor and the parallel shunt principle, the current distribution adjustment of the first LED lamp string 1 and the second LED lamp string 2 is realized, and the color temperature intensity can be dynamically adjusted according to requirements to mix a color temperature close to the third color temperature or the fourth color temperature.

[0061] In the embodiment of the present application, the LED lamp group further includes a first driving circuit 11, a second driving circuit 12, and an adjustment circuit 15, which are used to adjust the LED lamp group so that the LED lamp group can display a fifth color temperature, enhancing the color temperature adjustment ability of the LED lamp group.

[0062] The input end of the first driving circuit 11 is electrically connected to the same I / O port as the signal input end of the third control circuit 5, and the output end is electrically connected to the signal input end of the adjustment circuit 15.

[0063] The input end of the second driving circuit 12 is electrically connected to the same I / O port as the signal input end of the fourth control circuit 6, and the output end is electrically connected to the signal input end of the adjustment circuit 15.

[0064] The current input end of the adjustment circuit 15 is electrically connected to the output end of the second LED lamp string 2, and the output end is electrically connected to the negative power supply 14.

[0065] In this embodiment, by introducing the combined action of the first driving circuit 11, the second driving circuit 12, and the adjustment circuit 15, the LED lamp group can display a fifth color temperature, significantly enhancing the color temperature adjustment ability. Moreover, this design optimizes the circuit structure, and the current distribution can be more precisely controlled through the adjustment circuit, thereby achieving more precise color temperature control.

[0066] In the embodiment of the present application, the first driving circuit 11, the second driving circuit 12, and the adjustment circuit 15 are used to drive the adjustment circuit 15 to adjust the current of the second LED lamp string 2 in the conducting state when the first driving circuit 11 and the second driving circuit 12 simultaneously receive control signals.

[0067] Specifically, the input end of the first driving circuit 11 is electrically connected to the third I / O port 9, and the input end of the second driving circuit 12 is electrically connected to the fourth I / O port 10. When the third I / O port 9 and the fourth I / O port 10 simultaneously output high levels, the first driving circuit 11 and the second driving circuit 12 together drive the adjustment circuit 15 to adjust the current on the second LED lamp string 2.

[0068] In this embodiment, through the synergistic effect of the first driving circuit 11, the second driving circuit 12 and the regulating circuit 15, the color temperature regulating capability of the LED lamp group is improved, and the flexibility, scalability and stability of the LED lamp group are enhanced.

[0069] In the embodiment of the present application, the circuit structure of the first driving circuit 11 is the same as that of the second driving circuit 12. Figure 2 As shown, it at least includes: an emitter resistor, a base resistor, a diode and a transistor.

[0070] One end of the emitter resistor is electrically connected to the I / O port, and the other end is electrically connected to the emitter of the transistor.

[0071] The emitter resistance of the first drive circuit 11 is Figure 2 In the figure, it is represented as R9, that is, the emitter resistor R9, which is electrically connected to the third I / O port 9. The emitter resistor of the second drive circuit 12 is Figure 2 In the figure, it is represented by R11 , ie, the emitter resistor R11 , which is electrically connected to the fourth I / O port 10 .

[0072] One end of the base resistor is electrically connected to the negative electrode 14 of the power supply, and the other end is electrically connected to the base of the transistor.

[0073] The base resistance of the first driving circuit 11 is Figure 2 In the figure, it is represented as R10, that is, the base resistance R10, and the base resistance of the second driving circuit 12 is Figure 2 It is represented as R12, that is, the base resistor R12.

[0074] The cathode of the diode is electrically connected to the emitter of the transistor, and the anode of the diode is electrically connected to the collector of the transistor.

[0075] Among them, the diode of the first driving circuit 11 is Figure 2 It is represented as D1, that is, diode D1, and transistor Figure 2 In the figure, it is represented as Q6, that is, transistor Q6, and the diode of the second driving circuit 12 is Figure 2 It is represented as D2, that is, diode D2, and transistor Figure 2 It is represented as Q7, that is, transistor Q7.

[0076] The transistor collector is the output end of the driving circuit.

[0077] Specifically, when a high level is output only through the third I / O port 9, the transistor Q6 of the first drive circuit 11 is turned on, but the voltage on the regulation circuit 15 is clamped by the diode D2 of the second drive circuit 12. Because D2 is forward-conducted at this time, the regulation circuit 15 cannot operate normally. Similarly, when a high level is output only through the fourth I / O port 10, the regulation circuit 15 cannot operate normally.

[0078] When the high level is output simultaneously through the third I / O port 9 and the fourth I / O port 10, the diode D1 of the first drive circuit 11 and the diode D2 of the second drive circuit 12 no longer clamp the voltage on the adjustment circuit 15. At this time, the adjustment circuit 15 can operate normally.

[0079] In this embodiment, through the cooperation of the first drive circuit 11 and the second drive circuit 12, by using the clamping protection function of the diode and the saturation conduction and cut-off functions of the triode, the precise control of the adjustment circuit 15 is achieved, improving the stability of the circuit. At the same time, when the high level is output simultaneously through the two I / O ports, the adjustment circuit 15 can operate normally, thereby realizing more precise current adjustment and color temperature control.

[0080] In the embodiment of the present application, the adjustment circuit 15 includes a protection resistor, a current limiting resistor, and a MOS transistor. The circuit structure of the adjustment circuit is as Figure 2 shown.

[0081] One end of the protection resistor is electrically connected to the output ends of the first drive circuit 11 and the second drive circuit 12, and the other end is electrically connected to the negative power supply.

[0082] Among them, the protection resistor of the adjustment circuit 15 is represented as R5 in Figure 2 , that is, the protection resistor R5.

[0083] One end of the current limiting resistor is electrically connected to the output end of the second LED string 2, and the other end is electrically connected to the drain of the MOS transistor.

[0084] Among them, the current limiting resistor of the adjustment circuit 15 is represented as R6 in Figure 2 , that is, the current limiting resistor R6.

[0085] The gate of the MOS transistor is electrically connected to the output ends of the first drive circuit 11 and the second drive circuit 12, and the source of the MOS transistor is electrically connected to the negative power supply 14.

[0086] Among them, the MOS transistor of the adjustment circuit 15 is represented as Q5 in Figure 2 , that is, the MOS transistor Q5.

[0087] Specifically, when high levels are simultaneously output through the third I / O port 9 and the fourth I / O port 10, the MOS transistor Q5 of the adjustment circuit 15 conducts. At this time, the adjustment circuit 15, the third control circuit 5, and the fourth control circuit 6 conduct simultaneously. The adjustment circuit 15 and the third control circuit 5 are connected in parallel to the second LED string 2. That is, the current-limiting resistor R6 of the adjustment circuit 15 and the current-limiting resistor R7 of the third control circuit 5 are connected in parallel. By adjusting the size of the current-limiting resistor R6, the size of the total resistance value after the current-limiting resistor R6 and the current-limiting resistor R7 are connected in parallel can be adjusted, and further, the current distribution ratio between the first LED string 1 and the second LED string 2 can be adjusted, thereby mixing the fifth color temperature.

[0088] In this embodiment, through the collaborative control of the protection resistor R5, the current-limiting resistor R6, and the MOS transistor Q5, the precise adjustment of the current on the second LED string 2 is achieved, so that the fifth color temperature can be displayed, further enhancing the flexibility and diversity of color temperature adjustment. At the same time, the protection resistor R5 of the adjustment circuit 15 effectively prevents the LED lights from flashing caused by mis-conduction, improving the stability of the circuit and the reliability of the components. In addition, through the application of the current-limiting resistor R6 and the parallel shunt principle, when high levels are simultaneously output through the third I / O port 9 and the fourth I / O port 10, the adjustment circuit 15 can achieve a more refined current distribution, optimizing the color temperature mixing effect.

[0089] In the embodiment of the present application, a method for controlling the color temperature of an LED lamp group is also proposed, which is applied to the LED lamp group in the embodiment of the present application. The flow of the control method is as Figure 3 shown, and at least includes: S1: The single-chip microcomputer I / O port sends a control signal; S2: After receiving the control signal, the control circuit controls the corresponding control circuit to conduct; Among them, the control circuit includes a first control circuit 1, a second control circuit 2, a third control circuit 3, and a fourth control circuit 4; S3: After receiving the control signal, the first drive circuit 11 and / or the second drive circuit 12 determines whether the adjustment circuit 15 needs to be conducted; S4: After the current size on the LED lamp group is adjusted by the control circuit and the adjustment circuit, the LED lamp group displays the color temperature according to the current size.

[0090] Specifically, according to the control signal sent by the single-chip microcomputer I / O port and the color temperature control method in the embodiment of the present application, the LED lamp group can be precisely controlled to display five color temperatures. The circuit control principle is: Color temperature 1: When the second I / O port 8 outputs a high level and the first I / O port 7, the third I / O port 9, and the fourth I / O port 10 output low levels, the MOS transistor Q2 conducts, and the MOS transistors Q1, Q3, Q4, and Q5 are cut off. At this time, only the first LED string 1 is connected between the power supply positive electrode 13 and the power supply negative electrode 14 through the MOS transistor Q2, and the color temperature is the first color temperature.

[0091] Color temperature 2: When the first I / O port 7 outputs a high level and the second I / O port 8, the third I / O port 9, and the fourth I / O port 10 output low levels, the MOS transistor Q1 conducts, and the MOS transistors Q2, Q3, Q4, and Q5 are cut off. At this time, only the second LED string 2 is connected between the power supply positive electrode 13 and the power supply negative electrode 14 through the MOS transistor Q1, and the color temperature is the second color temperature.

[0092] Color temperature 3: When the first I / O port 7 and the fourth I / O port 10 output high levels and the second I / O port 8 and the third I / O port 9 output low levels, the MOS transistors Q1 and Q4 conduct, and the MOS transistors Q2, Q3, and Q5 are cut off. The reason for the cut-off of the MOS transistor Q5 is that the third I / O port 9 is at a low level, and the GS voltage of the MOS transistor Q5 is clamped by the diode D1 and is equal to the conduction voltage drop of the diode D1.

[0093] At this time, the first LED string 1 is connected between the power supply positive electrode 13 and the power supply negative electrode 14 after being connected in series with the current-limiting resistor R8 and the MOS transistor Q4, and the second LED string 2 is connected between the power supply positive electrode 13 and the power supply negative electrode 14 after being connected in series with the MOS transistor Q1. At this time, the color temperature is a mixture of the color temperature of the first LED string 1 and the color temperature of the second LED string 2, and the LED lamp group displays a third color temperature close to the second color temperature.

[0094] Among them, the specific color temperature depends on the resistance value of the current-limiting resistor R8 of the fourth control circuit 6. The larger the resistance value of the current-limiting resistor R8, the larger the impedance of the series connection of the current-limiting resistor R8 and the first LED string 1. According to the parallel shunt principle, the smaller the current passing through the first LED string 1 and the larger the current passing through the second LED string 2, the closer the color temperature is to the color temperature of the second LED string 2. The third color temperature can be adjusted by adjusting the resistance value of the current-limiting resistor R8.

[0095] Color temperature 4: When the second I / O port 8 and the third I / O port 9 output high levels and the first I / O port 7 and the fourth I / O port 10 output low levels, the MOS transistors Q2 and Q3 conduct, and the MOS transistors Q1, Q4, and Q5 are cut off. The reason for the cut-off of the MOS transistor Q5 is that the fourth I / O port 10 is at a low level, and the GS voltage of the MOS transistor Q5 is clamped by the diode D2 and is equal to the conduction voltage drop of the diode D2.

[0096] At this time, the second LED string 2 is connected in series with the current-limiting resistor R7 and the MOS transistor Q3 and then connected between the positive power supply terminal 13 and the negative power supply terminal 14. The first LED string 1 is connected in series with the MOS transistor Q2 and then connected between the positive power supply terminal 13 and the negative power supply terminal 14. The color temperature at this time is a mixture of the color temperature of the first LED string 1 and the color temperature of the second LED string 2, and the LED lamp group displays a fourth color temperature close to the first color temperature.

[0097] Among them, the specific color temperature depends on the resistance value of the current-limiting resistor R7 of the third control circuit 5. The larger the resistance value of the current-limiting resistor R7, the larger the impedance of the series connection of the current-limiting resistor R7 and the second LED string 2. According to the parallel current-sharing principle, the smaller the current passing through the second LED string 2, the larger the current passing through the first LED string 1, and the closer the color temperature is to the color temperature of the first LED string 1. The fourth color temperature can be adjusted by adjusting the resistance value of the current-limiting resistor R7.

[0098] Color temperature 5: When the third I / O port 9 and the fourth I / O port 10 output high levels, and when the first I / O port 7 and the second I / O port 8 output low levels, at this time, the MOS transistors Q3 and Q4 are turned on, the diodes D1 and D2 are turned off, the MOS transistors Q1 and Q2 are turned off, and the triode Q7 of the second driving circuit 12 is turned on. When the triode Q7 is turned on, the current passing through the emitter resistor R11 is equal to the sum of the current passing through the base resistor R12 and the current passing through the CE junction of the triode Q7. Since the first driving circuit 11 and the second driving circuit 12 have the same structure, the current of the first driving circuit 11 will not flow into the second driving circuit 12. Similarly, the current of the second driving circuit 12 will not flow into the first driving circuit 11, and the currents of the CE junctions of the triodes Q6 and Q7 are the same. Therefore, there is the following equation: 。

[0099] Among them, in the equation, V is the power supply voltage, Vb is the base voltage of the triode, Vbe is the voltage between the base and the emitter of the triode, R11 is the resistance value of the emitter resistor R11, R12 is the resistance value of the base resistor R12, and R5 is the resistance value of the protection resistor R5.

[0100] Select a suitable set of values, such as V = 5V, R11 = 1kΩ, R12 = 100kΩ, Vbe = 0.6V. The Vb = 4.34V can be obtained by solving the above equation, and the GS voltage of the MOS transistor Q5 is Vb + Vbe = 4.94V. Therefore, the MOS transistor Q5 is turned on.

[0101] Similarly, the triode Q6 of the first driving circuit 11 is turned on. At this time, the current-limiting resistor R6 and the current-limiting resistor R7 are in parallel. The second LED light string 2 is in series with the total resistance after the parallel connection of the current-limiting resistor R6 and the current-limiting resistor R7 between the positive power supply 13 and the negative power supply 14. The first LED light string 1 is connected between the positive power supply 13 and the negative power supply 14 after being connected in series with the current-limiting resistor R8. The resistance value after the parallel connection of the current-limiting resistor R6 and the current-limiting resistor R7 is greater than 0 and less than the current-limiting resistor R7. Therefore, the current passing through the second LED light string 2 is less than the current passing through the second LED light string 2 when displaying the third color temperature. At this time, the LED light group displays the fifth color temperature, which is closer to the first color temperature than the third color temperature. The color temperature of the fifth color temperature can be accurately adjusted by changing the resistance value of the current-limiting resistor R6.

[0102] In this embodiment, by sending control signals through the single-chip microcomputer I / O port, the on and off of different MOS transistors are accurately controlled, realizing flexible adjustment of the color temperature displayed by the LED light group. Five different color temperatures can be displayed, thereby improving the flexibility and diversity of color temperature adjustment and meeting the lighting requirements in different scenarios. At the same time, this method has flexibility and scalability and can be easily extended to more LED light strings or more complex color temperature adjustment requirements. In addition, by adjusting the resistance values of the current-limiting resistor and the current-limiting resistor, the mixing ratio of the color temperature can be accurately controlled, and more precise color temperature adjustment can be achieved.

[0103] Regarding the device in the above embodiment, the specific manners in which each module performs operations have been described in detail in the embodiment related to the method, and will not be elaborated here.

[0104] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. An LED lamp set capable of accurately controlling color temperature, characterized in that: The LED light group is controlled through the I / O port of the single-chip microcomputer, and the LED light group at least includes a first LED light string, a second LED light string, a first control circuit, a second control circuit, a third control circuit, and a fourth control circuit; The input end of the first LED light string is electrically connected to the positive electrode of the power supply, and the output end is electrically connected to the current input end of the second control circuit and the fourth control circuit; The input end of the second LED light string is electrically connected to the positive electrode of the power supply, and the output end is electrically connected to the current input end of the first control circuit and the third control circuit; The output ends of the first control circuit, the second control circuit, the third control circuit and the fourth control circuit are electrically connected to the negative electrode of the power supply; The signal input ends of the first control circuit, the second control circuit, the third control circuit, and the fourth control circuit are electrically connected to the I / O port respectively; Among them, the second control circuit and the fourth control circuit are used to control the positive and negative poles of the first LED light string to be conductive, and the first control circuit and the third control circuit are used to control the positive and negative poles of the second LED light string to be conductive.

2. The LED lamp assembly according to claim 1, characterized in that: The first LED light string and the second LED light string have the same circuit structure, and both have multiple LED lights connected in series; Wherein, the first LED light string and the second LED light string respectively display two color temperatures; The first LED light string and the second LED light string are used to display color temperatures of different intensities according to the current after conduction when the positive and negative poles are turned on.

3. The LED lamp assembly according to claim 1, characterized in that: The second control circuit and the fourth control circuit are used to control the positive and negative electrodes of the first LED light string to be turned on according to the control signal sent by the I / O port; The first control circuit and the third control circuit are used to control the conduction of the positive and negative electrodes of the second LED light string according to the control signal sent by the I / O port.

4. The LED lamp assembly according to claim 3, characterized in that: The first control circuit has the same circuit structure as the second control circuit, and at least comprises: a protection resistor and a MOS tube; One end of the protection resistor is electrically connected to the gate of the MOS tube, and the other end is electrically connected to the negative electrode of the power supply; The gate of the MOS tube is electrically connected to the output end of the I / O port of the single-chip computer, the source of the MOS tube is electrically connected to the negative electrode of the power supply, and the drain of the MOS tube is electrically connected to the output end of the LED light string.

5. The LED lamp assembly according to claim 3, characterized in that: The third control circuit has the same circuit structure as the fourth control circuit, and at least comprises: a protection resistor, a current limiting resistor, and a MOS tube; One end of the protection resistor is electrically connected to the gate of the MOS tube, and the other end is electrically connected to the negative electrode of the power supply; The gate of the MOS tube is electrically connected to the output end of the I / O port of the single-chip computer, and the source of the MOS tube is electrically connected to the negative electrode of the power supply; One end of the current limiting resistor is electrically connected to the drain of the MOS tube, and the other end is electrically connected to the output end of the LED light string.

6. The LED lamp assembly according to claim 1, characterized in that: The LED lamp group also includes a first drive circuit, a second drive circuit and a regulating circuit; The input end of the first driving circuit and the signal input end of the third control circuit are electrically connected to the same I / O port, and the output end is electrically connected to the signal input end of the regulating circuit; The input end of the second driving circuit is electrically connected to the same I / O port as the signal input end of the fourth control circuit, and the output end is electrically connected to the signal input end of the regulating circuit; The current input end of the regulating circuit is electrically connected to the output end of the second LED light string, and the output end is electrically connected to the negative pole of the power supply.

7. The LED lamp assembly according to claim 6, characterized in that: The first driving circuit, the second driving circuit and the regulating circuit are used to drive the regulating circuit to regulate the current of the second LED light string in the on state when the first driving circuit and the second driving circuit receive control signals at the same time.

8. The LED lamp assembly according to claim 6, characterized in that: The first driving circuit has the same circuit structure as the second driving circuit, and at least comprises: an emitter resistor, a base resistor, a diode and a transistor; One end of the emitter resistor is electrically connected to the I / O port, and the other end is electrically connected to the emitter of the transistor; One end of the base resistor is electrically connected to the negative electrode of the power supply, and the other end is electrically connected to the base of the transistor; The cathode of the diode is electrically connected to the emitter of the transistor, and the anode of the diode is electrically connected to the collector of the transistor; The transistor collector is the output end of the driving circuit.

9. The LED lamp assembly according to claim 6, characterized in that: The regulating circuit includes a protection resistor, a current limiting resistor and a MOS tube; One end of the protection resistor is electrically connected to the output ends of the first drive circuit and the second drive circuit, and the other end is electrically connected to the negative electrode of the power supply; One end of the current limiting resistor is electrically connected to the output end of the second LED light string, and the other end is electrically connected to the drain of the MOS tube; The gate of the MOS tube is electrically connected to the output ends of the first driving circuit and the second driving circuit, and the source of the MOS tube is electrically connected to the negative electrode of the power supply.

10. A method for controlling the color temperature of an LED lamp group, characterized in that: The LED lamp assembly according to any one of claims 1 to 9 comprises at least: The microcontroller I / O port sends a control signal; After receiving the control signal, the control circuit controls the corresponding control circuit to conduct; Wherein, the control circuit includes the first control circuit, the second control circuit, the third control circuit and the fourth control circuit; After receiving the control signal, the first driving circuit and / or the second driving circuit determines whether the regulating circuit needs to be turned on; After the current size of the LED light group is adjusted by the control circuit and the adjustment circuit, the LED light group displays the color temperature according to the current current size.

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