Color temperature-variable series-connected lamp beads and color temperature adjustment method

Abstract

The present invention relates to the technical field of color temperature-variable series-connected lamp beads, and disclosed are color temperature-variable series-connected lamp beads and a color temperature adjustment method, involving control using a single-chip microcomputer, control using switches, and other control modes. The control using the switches realizes the conduction of lamp beads on circuits by means of the turn-on of the switches on different circuits so as to achieve a color mixing effect. The control using the single-chip microcomputer employs a pin of the single-chip microcomputer to output a PWM signal, and the PWM signal is at a high level or a low level; when the PWM signal is at the high level, a triode Qa and a triode Qb output a small current; and when the PWM signal is at the low level, the triode Qa and the triode Qb output a large current. An adjustment apparatus further comprises a resistor Ra and a resistor Rb which are electrically connected to the pin of the single-chip microcomputer; and a base of the triode Qa is connected downstream of the resistor Ra. According to the present invention, a third path is set to be a common color temperature path, so that intermediate color temperature can be used to save the number of lamp beads; when a current flows through the triode Qa or the triode Qb, the third path can perform color mixing with a first path or a second path; and the single-chip microcomputer controls the conduction of the triode Qa and the triode Qb to adjust the current flowing through the triode Qa and the triode Qb, thereby adjusting the luminous intensity of the first path and the luminous intensity of the second path.

Description

Variable color temperature series lamp beads and color temperature adjustment method Technical Field

[0001] The present invention relates to the technical field of color temperature variable series lamp beads, and in particular to color temperature variable series lamp beads and a color temperature adjustment method. Background Art

[0002] Color temperature is a physical quantity used in lighting optics to define the color of a light source. Specifically, when a black body is heated to a temperature at which the light it emits matches the color of a light source, the temperature at which the black body is heated is called the color temperature of the light source, or simply color temperature, and is expressed in Kelvin. The essence of color temperature is the temperature of the color, not the color of the temperature.

[0003] Currently, most color temperature adjustment schemes use a dial switch to control the distribution of lamp current by switching the dial switch and adjusting the diode and resistor. This mechanical adjustment method is limited by the properties of the electronic components themselves. The jump value of color temperature adjustment is large, making it difficult to achieve smooth adjustment of color temperature and smooth transition of color temperature values, making it difficult to accurately adjust the color temperature of color-changing lamp beads. To this end, we propose a variable color temperature series lamp bead and color temperature adjustment method that can improve the accuracy of color temperature adjustment.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide a color temperature variable series lamp bead and a color temperature adjustment method to solve the problems raised in the above background technology.

[0006] On the one hand, to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a variable color temperature series lamp bead adjustment device, including a single-chip microcomputer, the single-chip microcomputer is an STC89C51 chip, which serves as a control unit for color temperature adjustment, the pin of the single-chip microcomputer outputs a PWM signal, the PWM signal is a square wave signal or a sine and cosine signal, and the PWM signal is a high level or a low level; when the PWM signal is a high level, the transistor Qa and the transistor Qb output a small current; when the PWM signal is a low level, the transistor Qa and the transistor Qb output a large current; the adjustment device also includes a resistor electrically connected to the pin of the single-chip microcomputer Ra and resistor Rb, the downstream of resistor Ra is connected to the base of transistor Qa, the collector of transistor Qa is connected to the diode Da adjustment path, one end of the diode Da adjustment path is connected to the mechanical switch group, the downstream of resistor Rb is connected to the base of transistor Qb, the collector of transistor Qb is connected to the diode Db adjustment path, one end of the diode Db adjustment path is connected to the mechanical switch group, one end of the mechanical switch group is connected to the LED lamp group, and one end of the LED lamp group is connected to the positive pole of the power supply; the diode adjustment path includes a first path, a second path and a third path, and the third path is a common color temperature path.

[0007] As a further solution of the present invention: the model of the single chip microcomputer is STC89C51, which serves as a control unit for color temperature adjustment.

[0008] As a further solution of the present invention: the duty cycle of the PWM signal is The average current flowing through the LED lamp is: Among them, I L is the average output current value, is the duty cycle, t on is the power-on duration, T is a single signal cycle, and I is the current amplitude. By changing the amplitude of the output current of transistor Qa and transistor Qb, the average current value can be changed.

[0009] As a further solution of the present invention: the bases of the transistor Qa and the transistor Qb are respectively signal input terminals, and the collectors of the transistor Qa and the transistor Qb are respectively signal output terminals.

[0010] As a further solution of the present invention: the diode adjustment path includes a first path, a second path, and a third path, the first path and the second path are connected in parallel, one end of the first path and the second path are respectively connected to the third path, the first path, the second path, and the third path respectively include a plurality of diodes Da, a diode Db, and a diode Dc, and the plurality of diodes Da, Db, and Dc are used to achieve current distribution on different paths.

[0011] As a further solution of the present invention: the mechanical switch group includes branch switches Ka and Kb, the LED lamp group includes LED lamp La and LED lamp Lb, the branch switch Ka is used to control the current on and off in LED lamp La, and the branch switch Kb is used to control the current in LED lamp Lb.

[0012] As a further solution of the present invention: the emitters of the transistor Qa and the transistor Qb are grounded.

[0013] As a further solution of the present invention: the mechanical switch group includes a shift switch K and multiple selection gears, the shift switch K turns on the LED lamp Lb, the LED lamp Lb is connected in series with resistors Re and Rf in sequence, one end of the resistor Rf is connected in series with resistor Rg, the resistor Rg is connected in parallel with resistor Rh, the downstream of the resistor Rh is connected to the LED lamp La, the resistor Rc is connected between the LED lamp La and the LED lamp Lb, the resistor Rc is connected in parallel with resistor Rj, and the upstream of the LED lamp La is connected in series with resistors Rd and Ri in sequence.

[0014] On the other hand, the technical solution provided by the present invention includes the following steps for adjusting the color temperature of the variable color temperature series lamp beads:

[0015] Step 1: The pin of the microcontroller STC89C51 outputs a PWM square wave signal, and when the PWM square wave signal is high;

[0016] Step 2: The small output current of transistors Qa and Qb causes PWM to change the duty cycle and the average output current.

[0017] Step 3: The average current changes so that the average luminous brightness changes, thereby achieving dimming of the LED lamp group.

[0018] As a further solution of the present invention: in the above step 1, the PWM square wave signal output by the pin of the single chip microcomputer STC89C51 is at a low level, and the transistor Qa and the transistor Qb respectively output a large current.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention sets the third path as a common color temperature path, which can save the number of lamp beads by adopting an intermediate color temperature. When current flows through transistor Qa or transistor Qb, the third path can mix colors with the first path or the second path. The conduction of transistor Qa and transistor Qb is controlled by the single-chip microcomputer, and the current flowing through transistor Qa and transistor Qb is adjusted, so that the luminous intensity of the first path and the second path can be adjusted.

[0021] 2. The present invention adopts a single-chip microcomputer of model STC89C51 as a control unit to output square wave signals with different duty cycles, thereby changing the input current of the base of transistor Qa and transistor Qb. The current output by the collector of transistor Qa and transistor Qb is adjusted through transistor Qa and transistor Qb, which can avoid the problem of insufficient smoothness of color temperature transition caused by the traditional dial switch path formed by resistors to adjust the color temperature, and greatly improve the accuracy of color temperature adjustment of color-changing series lamp beads. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a circuit connection diagram of a first embodiment of the present invention;

[0023] FIG2 is a circuit connection diagram of a second embodiment of the present invention.

[0024] In the picture: 1. Microcontroller. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1:

[0027] Please refer to Figure 1. The present invention provides a technical solution: a color temperature adjustment device for a series of variable color temperature lamp beads, including a single-chip microcomputer 1, which is an STC89C51 chip and serves as a control unit for color temperature adjustment. The pin of the single-chip microcomputer 1 outputs a PWM signal, which is a square wave signal or a sine and cosine signal, and is high or low. When the PWM signal is high, the transistor Qa and the transistor Qb output a small current; when the PWM signal is low, the transistor Qa and the transistor Qb output a large current. The adjustment device also includes a resistor Ra and a resistor Rb electrically connected to the pin of the single-chip microcomputer 1, the downstream of the resistor Ra is connected to the base of the transistor Qa, and the downstream of the transistor Qa is connected to the base of the transistor Qa. The collector is connected to the diode Da adjustment path, one end of the diode Da adjustment path is connected to the mechanical switch group, the downstream of the resistor Rb is connected to the base of the transistor Qb, the collector of the transistor Qb is connected to the diode Db adjustment path, the mechanical switch group includes branch switches Ka and Kb, the LED lamp group includes LED lamp La and LED lamp Lb, the branch switch Ka is used to control the current on and off in the LED lamp La, the branch switch Kb is used to control the current in the LED lamp Lb, one end of the mechanical switch group is connected to the LED lamp group, and one end of the LED lamp group is connected to the positive pole of the power supply; the diode adjustment path includes a first path, a second path and a third path, and the third path is a common color temperature path.

[0028] Preferably, the model of the single chip microcomputer 1 is STC89C51, which serves as a control unit for color temperature adjustment.

[0029] As a further solution of the present invention: the duty cycle of the PWM signal is The average current flowing through the LED lamp is: Among them, I L is the average output current value, is the duty cycle, t on is the power-on duration, T is a single signal cycle, and I is the current amplitude. By changing the amplitude of the output current of transistor Qa and transistor Qb, the average current value can be changed.

[0030] Preferably, the bases of the transistor Qa and the transistor Qb are signal input terminals, and the collectors of the transistor Qa and the transistor Qb are signal output terminals.

[0031] Preferably, the diode adjustment path includes a first path, a second path and a third path, the first path and the second path are connected in parallel, one end of the first path and the second path is respectively connected to the third path, the first path, the second path and the third path respectively include a plurality of diodes Da, a diode Db and a diode Dc, and the plurality of diodes Da, a diode Db and a diode Dc are used to realize the distribution of current on different paths.

[0032] Preferably, the emitters of the transistor Qa and the transistor Qb are grounded.

[0033] The color temperature adjustment method of the variable color temperature series lamp beads includes the following steps:

[0034] Step 1: The pin of the microcontroller STC89C51 outputs a PWM square wave signal, and when the PWM square wave signal is high;

[0035] Step 2: The small output current of transistors Qa and Qb causes PWM to change the duty cycle and the average output current.

[0036] Step 3: The average current changes so that the average luminous brightness changes, thereby achieving dimming of the LED lamp group.

[0037] This solution uses the STC89C51 microcontroller as a control unit to output square wave signals with different duty cycles, thereby changing the input current of the base of transistors Qa and Qb. The current output from the collector of transistors Qa and Qb is adjusted through transistors Qa and Qb. This can avoid the problem of insufficient color temperature transition smoothness caused by the traditional dial switch path formed by resistors to adjust the color temperature, and greatly improve the accuracy of color temperature adjustment of the color-changing series lamp beads.

[0038] Example 2:

[0039] The difference between this embodiment and the above embodiment is that: the mechanical switch group includes a shift switch K and multiple selection gears, the shift switch K turns on the LED lamp Lb, the LED lamp Lb is connected in series with resistors Re and Rf in sequence, one end of the resistor Rf is connected in series with resistor Rg, the resistor Rg is connected in parallel with resistor Rh, the downstream of the resistor Rh is connected to the LED lamp La, the resistor Rc is connected between the LED lamp La and the LED lamp Lb, the resistor Rc is connected in parallel with resistor Rj, and the upstream of the LED lamp La is connected in series with resistors Rd and Ri in sequence.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A variable color temperature series-connected lamp bead adjustment device, characterized in that It includes a single-chip microcomputer (1), and the pin of the single-chip microcomputer (1) outputs a PWM signal, and the PWM signal is a high level or a low level; When the PWM signal is at a high level, the triodes Qa and Qb output a small current; when the PWM signal is at a low level, the triodes Qa and Qb output a large current; The adjustment device further includes a resistor Ra and a resistor Rb electrically connected to the pin of the single-chip microcomputer (1). The downstream of the resistor Ra is connected to the base of the triode Qa, the collector of the triode Qa is connected to the diode Da adjustment path, one end of the diode Da adjustment path is connected to the mechanical switch group, the downstream of the resistor Rb is connected to the base of the triode Qb, the collector of the triode Qb is connected to the diode Db adjustment path, one end of the diode Db adjustment path is connected to the mechanical switch group, one end of the mechanical switch group is connected to the LED lamp group, and one end of the LED lamp group is connected to the positive pole of the power supply; The diode adjustment path includes a first path, a second path and a third path, and the third path is a common color temperature path.

2. The color temperature adjustable series-connected lamp bead adjusting device according to claim 1, wherein: The model of the single-chip microcomputer (1) is STC89C51.

3. The adjustable device for color temperature series-connected lamp beads according to claim 2, characterized in that: The duty cycle of the PWM signal is The average current value flowing through the LED lamp beads is: Among them, I L is the average current value of the output, is the duty cycle and I is the amplitude of the current.

4. The adjustable device for color temperature series-connected lamp beads according to claim 3, wherein: The bases of the triodes Qa and Qb are respectively signal input ends, and the collectors of the triodes Qa and Qb are respectively signal output ends.

5. The color temperature adjustable series LED lamp bead adjusting device according to claim 4, characterized in that: The diode adjustment path includes a first path, a second path and a third path. The first path and the second path are in parallel, one ends of the first path and the second path are respectively connected to the third path, and the first path, the second path and the third path respectively include a plurality of diodes Da, diodes Db and diodes Dc.

6. The adjustable device for color temperature series-connected lamp beads according to claim 5, characterized in that: The mechanical switch group includes branch switches Ka and Kb, and the LED lamp group includes LED lamps La and Lb.

7. The adjustable device for color temperature series-connected lamp beads according to claim 6, wherein: The emitters of the triodes Qa and Qb are grounded.

8. The color temperature adjustable series-connected lamp bead adjusting device according to claim 1, characterized in that: The mechanical switch group includes a toggle switch K and a plurality of selection gears. The toggle switch K is connected to the LED lamp Lb. The LED lamp Lb is sequentially connected in series with a resistor Re and a resistor Rf. One end of the resistor Rf is connected in series with a resistor Rg. The resistor Rg is in parallel with a resistor Rh. The downstream of the resistor Rh is connected to the LED lamp La. A resistor Rc is connected between the LED lamp La and the LED lamp Lb. The resistor Rc is in parallel with a resistor Rj. The upstream of the LED lamp La is sequentially connected in series with a resistor Rd and a resistor Ri.

9. The method for adjusting the color temperature of the color temperature variable series-connected lamp beads according to any one of claims 1-8, characterized in that: It includes the following steps: Step 1: The pin of the single-chip microcomputer STC89C51 outputs a PWM square wave signal, and when the PWM square wave signal is at a high level; Step 2: The triodes Qa and Qb output a small current to change the duty cycle of the PWM and change the output average current; Step 3: The change of the average current causes the change of the average light emission brightness, realizing the dimming of the LED lamp group.

10. The color temperature adjustment method of the color temperature variable series lamp beads according to claim 9, characterized in that: In the above step 1, the PWM square wave signal output by the pin of the single-chip microcomputer STC89C51 is at a low level, and the triodes Qa and Qb output a large current.

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