CN215121253U

CN215121253U - Two-line input dimming and color temperature adjusting circuit and lamp

Info

Publication number: CN215121253U
Application number: CN202023200683.5U
Authority: CN
Inventors: 何信高; 李万丰; 饶汉鑫; 陆群
Original assignee: Shenzhen Eastfield Lighting Co Ltd
Current assignee: Shenzhen Eastfield Lighting Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-12-10
Anticipated expiration: 2030-12-25

Abstract

The utility model relates to a two line input's mixing of colors temperature circuit and lamps and lanterns of adjusting luminance. The two-line input dimming and color temperature adjusting circuit only has one input line connected with the PWM dimming power supply and one input line connected with the grounding end. The PWM dimming power supply outputs the duty ratio of the pulse voltage to the first lamp bead branch circuit and the second lamp bead branch circuit through adjustment, so that the current flowing through the first lamp bead branch circuit and the second lamp bead branch circuit is adjusted, meanwhile, the on-off of the switch tube is controlled through the pulse voltage, and therefore when the duty ratio is reduced, the brightness descending amplitude of the first lamp bead is larger than that of the second lamp bead. Because first lamp pearl and second lamp pearl are adjacent arranging on the circuit board, consequently the colour temperature of luminous demonstration is the integration of first lamp pearl and second lamp pearl light, and along with the change of first lamp pearl and second lamp pearl luminance ratio, the colour temperature that fuses and obtains also changes thereupon to realize only adjusting the luminance and the colour temperature of lamps and lanterns through two line input.

Description

Two-line input dimming and color temperature adjusting circuit and lamp

Technical Field

The utility model relates to a technical field that adjusts luminance especially relates to two line inputs adjust luminance mixing of colors temperature circuit and lamps and lanterns.

Background

When the strip-shaped lamp strip with two lines input on the market is connected with a constant-voltage dimming power supply, most of the strip-shaped lamp strips can only realize the function of brightness adjustment, and the color temperature of the lamp strip cannot be directly adjusted.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a two-line input dimming and color temperature adjusting circuit for the current dimming and color temperature adjusting circuit with a complex structure.

In a first aspect, a two-wire input dimming and color temperature adjusting circuit is provided, which includes:

the light source unit comprises a first lamp bead branch and a second lamp bead branch, the cathode end of the first lamp bead branch is connected with the grounding end, the cathode end of the second lamp bead branch is connected with the grounding end, the first lamp bead branch comprises at least one first lamp bead, the second lamp bead branch comprises at least one second lamp bead, the first lamp bead has a first color temperature when emitting light, the second lamp bead has a second color temperature different from the first color temperature when emitting light, and each first lamp bead and each second lamp bead are arranged adjacently on the circuit board;

the PWM dimming power supply is connected with the anode end of the first lamp bead branch circuit and the anode end of the second lamp bead branch circuit and used for outputting pulse voltage with adjustable duty ratio so as to adjust the brightness of the first lamp bead branch circuit and the second lamp bead branch circuit;

the control unit comprises a first voltage division unit, a second voltage division unit and a switch tube, wherein the first end of the switch tube is connected with the cathode end of the first lamp bead branch, the second end of the switch tube is connected with the grounding end, the control end is connected with the PWM dimming power supply through the first voltage division unit and is connected with the grounding end through the second voltage division unit, and the switch tube is switched on and off under the control of the pulse voltage.

In one embodiment, the switch tube includes an N-channel MOS tube, the first end of the switch tube is a drain of the N-channel MOS tube, the second end of the switch tube is a source of the N-channel MOS tube, and the control end is a gate of the N-channel MOS tube.

In one embodiment, the first lamp bead branches comprise a plurality of first lamp bead branches connected in parallel, each first lamp bead branch comprises a plurality of first lamp beads connected in series, the second lamp bead branches comprise a plurality of second lamp bead branches connected in parallel, and each second lamp bead branch comprises a plurality of second lamp beads connected in series.

In one embodiment, the number of the first lamp bead branches is the same as that of the second lamp bead branches.

In one embodiment, the number of the first lamp beads of the first lamp bead branch is the same as that of the second lamp beads of the second lamp bead branch, and each first lamp bead and each second lamp bead are adjacently arranged on a circuit board.

In one embodiment, the two-wire input dimming and color temperature adjusting circuit further includes a first shunt unit and a second shunt unit, one end of the first shunt unit is connected to the second end of the switch tube, the other end of the first shunt unit is connected to the ground terminal, one end of the second shunt unit is connected to the cathode end of the second lamp bead branch, the other end of the second shunt unit is connected to the ground terminal, and the first shunt unit and the second shunt unit are used for adjusting the proportion of the currents flowing through the first lamp bead branch and the second lamp bead branch.

In one embodiment, the two-line input dimming and color temperature adjusting circuit further includes a third shunt unit and a fourth shunt unit, the third shunt unit is disposed in the first lamp bead branch, one end of the third shunt unit is connected to the PWM dimming power supply, the other end of the third shunt unit is connected to the ground terminal, the fourth shunt unit is disposed in the second lamp bead branch, one end of the fourth shunt unit is connected to the PWM dimming power supply, the other end of the fourth shunt unit is connected to the ground terminal, and the third shunt unit and the fourth shunt unit are used for adjusting proportion of currents flowing through the first lamp bead branch and the second lamp bead branch.

In one embodiment, the two-wire input dimming and color temperature adjusting circuit further includes a first capacitor, one end of the first capacitor is connected to a common terminal of the first voltage division unit and the second voltage division unit, and the other end of the first capacitor is connected to a ground terminal.

In one embodiment, the color temperature of the first lamp bead is higher than that of the second lamp bead.

In a second aspect, a lamp is provided, which includes the two-wire input dimming and color temperature adjusting circuit according to any one of the first aspect.

The two-line input dimming and color temperature adjusting circuit only has one input line connected with the PWM dimming power supply and one input line connected with the grounding end. The PWM dimming power supply outputs the duty ratio of the pulse voltage to the first lamp bead branch circuit and the second lamp bead branch circuit through adjustment, so that the current flowing through the first lamp bead branch circuit and the second lamp bead branch circuit is adjusted, meanwhile, the on-off of the switch tube is controlled through the pulse voltage, and therefore when the duty ratio is reduced, the brightness descending amplitude of the first lamp bead is larger than that of the second lamp bead. Because first lamp pearl and second lamp pearl are adjacent arranging on the circuit board, consequently the colour temperature of luminous demonstration is the integration of first lamp pearl and second lamp pearl light, and along with the change of first lamp pearl and second lamp pearl luminance ratio, the colour temperature that fuses and obtains also changes thereupon to realize only adjusting the luminance and the colour temperature of lamps and lanterns through two line input.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a two-wire input dimming and color temperature adjustment circuit according to a first embodiment;

fig. 2 is a schematic view of an arrangement structure of light source units in fig. 1;

FIG. 3 is a schematic view of another arrangement of the light source units in FIG. 1;

FIG. 4 is a two-wire input dimming and color temperature adjustment circuit according to a second embodiment;

FIG. 5 is a three-wire input dimming and color temperature adjustment circuit according to a third embodiment;

FIG. 6 is a four-wire input dimming and color temperature adjustment circuit according to a fourth embodiment;

fig. 7 shows a two-wire input dimming and color temperature adjustment circuit according to a fifth embodiment.

Description of reference numerals: 100-light source unit, 102-first lamp bead branch, 104-second lamp bead branch, 106-first lamp bead, 108-second lamp bead, 110-PWM dimming power supply, 120-control unit, 122-first voltage division unit, 124-second voltage division unit, 126-switching tube, 202-lamp bead, 204-lamp bead, 206-lamp bead, 208-lamp bead, 302-lamp bead, 304-lamp bead, 306-lamp bead, 308-lamp bead, 400-N channel MOS tube, 502-first lamp bead shunt, 504-second lamp bead shunt, 602-first current division unit, 604-second current division unit, 702-third current division unit, 704-fourth current division unit.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

With the increasing awareness of energy conservation and environmental protection, dimming lamps are more and more concerned by many people. Commonly used dimming power supplies include thyristor dimming, 0-10V dimming, and PWM dimming. Among them, the PWM dimming technology is considered as the most promising LED dimming technology. When performing the PWM dimming, an additional PWM signal source is provided. The duty ratio of the input pulse signal is changed to modulate a grid control signal of the LED driving chip to the power field effect transistor, so that the purpose of adjusting the current passing through the LED is achieved. PWM dimming is a dimming technique that repeatedly switches a lamp using simple digital pulses, and simply changes the output current by providing digital pulses of different widths, thereby adjusting the brightness of the lamp.

However, with the improvement of life quality of modern people, smart dimming lamps cannot meet the pursuit of people, and people are pursuing lamps capable of adjusting color temperature and brightness simultaneously.

The brightness and the color temperature of the lamp can be adjusted simultaneously by adopting two-way control. Specifically, two paths of power supplies control two paths of lamp beads with different color temperatures to emit light, and the functions of dimming and adjusting the color temperature are realized by changing the current of the two paths of lamp beads. However, the lamp for realizing light modulation and color temperature modulation by two-way control has a complex structure and high cost, and is not favorable for large-area popularization in the market.

Optionally, two lamp bead branches can be further arranged, one branch is a warm color temperature lamp bead, the other branch is a cold color temperature lamp bead, the forward Voltage (VF) value of the warm color temperature lamp bead is lower than that of the cold color temperature lamp bead, and in addition, a resistor is connected in series with the warm color temperature lamp bead in the other branch to adjust the light and adjust the color temperature of the lamp. However, the lamp has a small color temperature conversion interval, very large resistance loss and low luminous efficiency.

In view of this, the embodiment of the present application provides a two-line input dimming and color temperature adjusting circuit to solve the problem that the dimming and color temperature adjusting circuit has a complex structure.

Referring to fig. 1, a two-wire input dimming/color temperature adjustment circuit according to a first embodiment of the present application is shown. This two line input's dimming mixing of colors temperature circuit includes: light source unit 100, PWM dimming power supply 110, and control unit 120.

Specifically, the light source unit 100 includes a first lamp bead branch 102 and a second lamp bead branch 104. Specifically, the cathode terminal of the first lamp bead branch 102 is connected to the ground terminal, the cathode terminal of the second lamp bead branch 104 is connected to the ground terminal, the first lamp bead branch 102 includes at least one first lamp bead 106, and the second lamp bead branch 104 includes at least one second lamp bead 108. First lamp pearl 106 has first colour temperature when luminous, and second lamp pearl 108 has the second colour temperature different with first colour temperature when luminous, and each first lamp pearl 106 and each second lamp pearl 108 are arranged on the circuit board adjacently.

Optionally, the types of the first light bead 106 and the second light bead 108 may be different, and the types of the first light bead 106 and the second light bead 108 include, but are not limited to, Light Emitting Diodes (LEDs), incandescent lamps, and energy saving lamps. Optionally, the first lamp bead 106 and the second lamp bead 108 are both LEDs, and the LEDs are used as the materials of the first lamp bead and the second lamp bead, so that the service life of the two-line input dimming and color temperature adjusting circuit provided by the embodiment can be prolonged, and the energy consumption can be reduced. Optionally, the number of the first light beads 106 is different from that of the second light beads 108. Optionally, the color temperature of the first lamp bead 106 is lower than the color temperature of the second lamp bead 108. Optionally, the color temperature of the first light bead 106 and the second light bead 108 when emitting light may include: 2200K, 2700K, 3500K, 4000K, 5000K, 5700K, 6500K. Optionally, the color temperature of the first lamp bead is 3000K, and the color temperature of the second lamp bead is 6000K.

It should be explained that each first lamp bead 106 and each second lamp bead 108 are arranged adjacently on the circuit board, that is, the center distance between two adjacent first lamp beads 106 and second lamp beads 108 is smaller than the preset length, so that the color temperature of the light emitted and displayed by the light source unit 100 is the fusion of the light of the second lamp beads 108 of the first lamp beads 106, and the phenomenon of two color temperatures when the light source unit 100 emits light is avoided.

Optionally, the first lamp bead 106 and the second lamp bead 108 are adjacently arranged in the X direction. Referring to fig. 2, the two-line input dimming and color temperature adjusting circuit includes a lamp bead 202, a lamp bead 204, a lamp bead 206, and a lamp bead 208. Specifically, the center distance between the lamp bead 202 and the lamp bead 204 is smaller than the preset length, and the center distance between the lamp bead 206 and the lamp bead 208 is smaller than the preset length. Optionally, the lamp bead 202 and the lamp bead 206 are first lamp beads, and the lamp bead 204 and the lamp bead 208 are second lamp beads. Optionally, the lamp bead 202 and the lamp bead 206 are second lamp beads, and the lamp bead 204 and the lamp bead 208 are first lamp beads. Optionally, the lamp bead 204 and the lamp bead 206 are first lamp beads, and the lamp bead 202 and the lamp bead 208 are second lamp beads. Optionally, the lamp bead 204 and the lamp bead 206 are second lamp beads, and the lamp bead 202 and the lamp bead 208 are second lamp beads. Above-mentioned embodiment has realized that first lamp pearl 106 and second lamp pearl 108 are adjacent to be arranged in the X direction, and consequently the luminous colour temperature that shows of light source unit 100 is the integration of first lamp pearl 106 and second lamp pearl 108 light. Furthermore, because first lamp pearl 106 and second lamp pearl 108 are adjacent to be arranged in the X direction, consequently only have a lamp pearl in the Y direction, can reduce light source unit's area, this embodiment provides the less two line input of area promptly and adjusts luminance the temperature circuit.

It can be understood that the dimming and color temperature adjusting circuit with two-line input of the above embodiment may further include other numbers of lamp beads. Optionally, the two-line input dimming and color temperature adjusting circuit includes at least one set of

lamp beads

202 and 204, each set of

lamp beads

202 and 204 is arranged along the X direction and/or the Y direction, and the definitions of the

lamp beads

202 and 204 are the same as those of the previous embodiment, and are not described herein again. It can be understood that the center distances between the

lamp beads

202 and 204 in each group may be unequal as long as the center distances between the

lamp beads

202 and 204 are less than the preset length. Optionally, the lamp bead 203 contacts with the lamp bead 204 to obtain a two-line input dimming and temperature adjusting circuit with a smaller volume.

Optionally, the first lamp beads 106 and the second lamp beads 108 are adjacently arranged in the Y direction. Referring to fig. 3, the two-line input dimming and temperature adjusting circuit includes a lamp bead 302, a lamp bead 304, a lamp bead 306, and a lamp bead 308. Specifically, the center distance between the lamp bead 302 and the lamp bead 304 is smaller than the preset length, and the center distance between the support 306 and the lamp bead 308 is smaller than the preset length. Optionally, the lamp bead 302 and the lamp bead 306 are first lamp beads, and the lamp bead 304 and the lamp bead 308 are second lamp beads. Optionally, the lamp bead 302 and the lamp bead 306 are second lamp beads, and the lamp bead 304 and the lamp bead 308 are first lamp beads. Optionally, the lamp bead 304 and the lamp bead 306 are first lamp beads, and the lamp bead 302 and the lamp bead 308 are second lamp beads. Optionally, the lamp bead 304 and the lamp bead 306 are second lamp beads, and the lamp bead 302 and the lamp bead 308 are second lamp beads. Above-mentioned embodiment has realized that first lamp pearl 106 and second lamp pearl 108 are adjacent to be arranged in the Y direction, and consequently the luminous colour temperature that shows of light source unit 100 is the integration of first lamp pearl 106 and second lamp pearl 108 light.

It can be understood that the dimming and color temperature adjusting circuit with two-line input of the above embodiment may further include other numbers of lamp beads. Optionally, the two-line input dimming and color temperature adjusting circuit includes at least one set of lamp beads 303 and lamp beads 304, each set of lamp beads 303 and lamp beads 304 is arranged along the X direction and/or the Y direction, and the definitions of the lamp beads 303 and the lamp beads 304 are the same as those of the previous embodiment, and are not described herein again. It can be understood that the center distance between the lamp beads 303 and the lamp beads 304 in each group can be unequal as long as the center distance between the lamp beads 303 and the lamp beads 304 is less than the preset length. Optionally, the lamp bead 303 contacts the lamp bead 304 to obtain a two-line input dimming and temperature adjusting circuit with a smaller volume.

Specifically, the PWM dimming power supply 110 is connected to the anode terminal of the first lamp bead branch 102 and the anode terminal of the second lamp bead branch 104. Specifically, the PWM dimming power supply 110 is configured to output a pulse voltage with an adjustable duty cycle, so as to adjust the brightness of the first lamp bead branch 102 and the second lamp bead branch 104.

Specifically, the PWM dimming power supply 110 may output a pulse voltage, and a duty ratio of the output pulse voltage may be adjusted according to a requirement. The duty ratio of pulse voltage changes, leads to the effective current change of first lamp pearl branch road and second lamp pearl branch road to lead to the luminance change of first lamp pearl branch road and second lamp pearl branch road. Optionally, the duty ratio of the pulse voltage output by the PWM dimming power supply is 80%. It should be explained, the amplitude of the pulse voltage output by the PWM dimming power supply can be set according to the number of the lamp beads. Optionally, the amplitude of the pulse voltage output by the PWM dimming power supply is 20V.

Specifically, the control unit 120 includes a first voltage dividing unit 122, a second voltage dividing unit 124, and a switching tube 126. Specifically, a first end of the switching tube 126 is connected to a cathode end of the first lamp bead branch 102, a second end of the switching tube 126 is connected to a ground terminal, a control end of the switching tube 126 is connected to the PWM dimming power supply 110 through the first voltage dividing unit 122, and a control end of the switching tube 126 is connected to the ground terminal through the second voltage dividing unit 124. Specifically, the on/off of the switch tube 126 is controlled by the pulse voltage.

It should be noted that the first voltage dividing unit 122 and the second voltage dividing unit 124 can be used to adjust the voltage of the control terminal of the switching tube 126. By adjusting the voltage drop ratio of the first voltage division unit 122 and the second voltage division unit 124, the amplitude ratio of the voltage of the control terminal of the switching tube 126 to the pulse voltage output by the PWM dimming power supply 110 can be adjusted. Therefore, when the PWM dimming power supply 110 is replaced, that is, when the amplitude of the output pulse voltage changes, the ratio of the first voltage dividing unit 122 to the second voltage dividing unit 124 is adjusted, so as to clamp the voltage at the control terminal of the switching tube 126 to the voltage before the PWM dimming power supply 110 is not replaced, thereby ensuring that the on/off condition of the switching tube 126 is not affected by the replacement of the PWM dimming power supply 110. Optionally, the first voltage dividing unit 122 is a resistor R1. Optionally, the resistance of the resistor R1 is 225K Ω. Optionally, the second voltage dividing unit 124 is a resistor R2. Optionally, the resistance of the resistor R2 is 75K Ω.

The two-wire input dimming and color temperature adjusting circuit provided in the above embodiment has only one input wire connected to the PWM dimming power supply 110 and one input wire connected to the ground. The circuit structure capable of realizing light modulation and color temperature modulation is simple, the circuit cost is reduced, and the application is flexible.

Further, the PWM dimming power supply 110 adjusts the current flowing through the first lamp bead branch 102 and the second lamp bead branch 104 by adjusting the duty ratio of the pulse voltage output to the first lamp bead branch 102 and the second lamp bead branch 104, and controls the on/off of the switch tube 126 by the pulse voltage, so that the brightness decrease range of the first lamp bead 106 is greater than the brightness decrease range of the second lamp bead 108 when the duty ratio decreases. Because first lamp pearl 106 and second lamp pearl 108 are arranged adjacently on the circuit board, consequently the colour temperature that the luminescence appeared is the integration of first lamp pearl 106 and second lamp pearl 108 light, and along with the change of first lamp pearl 106 with second lamp pearl 108 luminance ratio, the colour temperature that fuses and obtains also changes thereupon to realize only adjusting the luminance and the colour temperature of lamps and lanterns through two line input.

Further, the brightness and color temperature of the lamp are adjusted by controlling the on and off of the switching tube 126, so that the loss of the dimming and color temperature adjusting circuit is reduced, and the light emitting efficiency of the light source unit 100 is improved.

Furthermore, the two-wire input dimming and color temperature adjusting circuit provided in the above embodiment controls the on/off of the switching tube 126 through the PWM dimming power supply 110, so that the adjustment interval of the color temperature and the brightness is large.

In the second embodiment of the present application, as shown in fig. 4, the switching transistor in the above embodiment may include an N-channel MOS transistor 400. Specifically, the first end of the switch tube is the drain of the N-channel MOS tube 400, the second end of the switch tube is the source of the N-channel MOS tube 400, and the control end of the switch tube is the gate of the N-channel MOS tube 400.

Specifically, referring to fig. 4, a drain of the N-channel MOS transistor 400 is connected to a cathode end of the first bead branch 102, a source thereof is connected to a ground terminal, and a gate thereof is connected to the PWM dimming power supply 110 through the first voltage dividing unit 122 and is connected to the ground terminal through the second voltage dividing unit 124.

Specifically, the source voltage of the N-channel MOS transistor 400 is clamped to 0, and when the PWM dimming power supply 110 outputs a voltage signal, the N-channel MOS transistor 400 is turned on; when the PWM dimming power supply 110 does not output a voltage signal, the N-channel MOS transistor 400 is turned off. Therefore, the on and off of the N-channel MOS transistor 400 is controlled by the pulse voltage, and when the duty ratio of the pulse voltage output by the PWM dimming power supply 110 decreases, the brightness decrease range of the first lamp bead 106 is greater than the brightness decrease range of the second lamp bead 108. Because first lamp pearl 106 and second lamp pearl 108 are arranged adjacently on the circuit board, consequently the colour temperature that the luminescence appeared is the integration of first lamp pearl 106 and second lamp pearl 108 light, and along with the change of first lamp pearl 106 with second lamp pearl 108 luminance ratio, the colour temperature that fuses and obtains also changes thereupon to realize only adjusting the luminance and the colour temperature of lamps and lanterns through two line input.

Furthermore, the N-channel MOS tube 400 is used as a switching tube, so that the on-resistance is small, the loss is small, the thermal resistance effect is good, and the safety is high.

In order to meet the user demand, the lamp may need to include a plurality of first lamp beads and second lamp beads, and if a plurality of first lamp beads are all connected in series and/or a plurality of second lamp beads are all connected in series, the dimming and color temperature adjustment circuit with two-line input consumes a relatively large amount of power. Therefore, the following embodiments will provide a two-wire input dimming and color temperature adjusting circuit to solve the above problems.

In a third embodiment of the present application, referring to fig. 5, the first lamp bead branch 102 in the above-mentioned embodiment may include multiple parallel first lamp bead branches 502, each first lamp bead branch 502 includes multiple series-connected first lamp beads 106, the second lamp bead branch 104 in the above-mentioned embodiment may include multiple parallel second lamp bead branches 504, and each second lamp bead branch 504 includes multiple series-connected second lamp beads 108.

It should be noted that, in this embodiment, the first lamp bead 106 and the second lamp bead 108 are adjacently arranged on the circuit board. Optionally, the number of the first lamp bead branches 502 in the above embodiment may be set according to the number of the first lamp beads 106, the working voltage, and the like. Optionally, the number of the first lamp bead branches 502 is 3. The number of the second lamp bead branches 504 in the above embodiments may be set according to the number of the second lamp beads 108, the operating voltage, and the like. Optionally, the number of the second lamp bead branches 504 is 3. It can be appreciated that the number of first bead branches 502 and second bead branches 504 can be different. The dimming and color temperature adjusting circuit with two-line input provided in this embodiment controls the on/off of the switching tube 126 through the pulse voltage output by the PWM dimming power supply 110, so as to control the brightness and color temperature of the lamp, and realize the simultaneous adjustment of the brightness and color temperature of the lamp.

Furthermore, compared with a series circuit, the dimming and color temperature adjusting circuit with two parallel lines of input of multiple beads provided by the embodiment reduces the power consumption of the circuit. Meanwhile, the dimming and color temperature adjusting circuit provided by the embodiment only comprises one input line connected with the PWM dimming power supply 110 and one input line connected with the ground terminal, and compared with a circuit which adopts two-way control to realize simultaneous adjustment of the brightness and color temperature of the lamp, the circuit is simpler when multiple lamps are connected in parallel, and has the advantages of low cost, small volume and flexible application.

In an alternative embodiment of the present application, the number of the first bead branches 502 and the second bead branches 504 may be the same. Optionally, the number of the first lamp bead branch 502 and the second lamp bead branch 504 are 4. Optionally, in the above embodiment, the number of the first beads 106 of the first bead branch 102 is the same as the number of the second beads 108 of the second bead branch 104. Optionally, the number of the first light beads 106 and the number of the second light beads 108 are both 28. In the above embodiment, since the number of the first lamp beads 106 is the same as that of the second lamp beads 108, and the first lamp beads 106 and the second lamp beads 108 are adjacently arranged on the circuit board, the color temperature of the luminous appearance is the fusion of the light of the first lamp beads 106 and the light of the second lamp beads 108, so that the light emission is more uniform.

Under the condition that the switching tube is completely switched on under the control of the PWM dimming power supply, the currents flowing through the first lamp bead and the second lamp bead are the same (the number of the branches of the first lamp bead is the same as that of the branches of the second lamp bead, and the number of the first lamp bead and the number of the second lamp bead are the same), and at the moment, the color temperature of the dimming and color temperature adjusting circuit input by two lines is a middle value of the first color temperature and the second color temperature. According to the difference of demand, if will adjust the colour temperature of circuit this moment, can be through first lamp pearl and the second lamp pearl that the colour temperature is different when the colour temperature when changing the light-emitting and the primary light-emitting, but when the quantity of lamp pearl was many, change complex operation and with high costs, the following embodiment will provide one kind and can adjust the two line input of the electric current that flow through first lamp pearl and second lamp pearl and adjust luminance mixing of colors temperature circuit.

In a fourth embodiment of the present application, referring to fig. 6, the two-wire input dimming and color temperature adjustment circuit of the above embodiment further includes a first shunting unit 602 and a second shunting unit 604. Specifically, one end of the first shunting unit 602 is connected to the second end of the switching tube 126, and the other end of the first shunting unit 602 is connected to the ground. One end of the second shunt unit 604 is connected to the cathode end of the second bead branch 104, and the other end of the second shunt unit 604 is connected to the ground end. Specifically, the first shunt unit 602 and the second shunt unit 604 are used for adjusting the proportion of the currents flowing through the first bead branch 102 and the second bead branch 104.

Optionally, the first shunting unit 602 in the above embodiments may include a resistor R3. Alternatively, the resistance of the resistor R3 may be 180 Ω. Optionally, the second shunt unit 604 in the above embodiments may include a resistor R4. Alternatively, the resistance of the resistor R4 may be 150 Ω.

Referring to fig. 6, when the PWM dimming power supply 110 outputs a stable dc voltage, the currents flowing through the first lamp bead 106 and the second lamp bead 108 are the same, but the resistance ratios of the first shunt unit 602 and the second shunt unit 604 are specifically adjusted by adjusting the resistances of the first shunt unit 602 and the second shunt unit 604, so as to adjust the current ratios flowing through the first lamp bead branch 102 and the second lamp bead branch 104, that is, adjust the current ratios flowing through the first lamp bead 106 and the second lamp bead 108, and further adjust the color temperature when the dimming and color temperature adjusting circuit with two-line input emits light when the switching tube 126 is completely turned on. It is understood that adjusting the first shunt unit 602 and the second shunt unit 604 can not only adjust the color temperature when the circuit emits light when the light-emitting tube 126 is fully turned on, but actually, the color temperature when the circuit emits light at any time is affected by the first shunt unit 602 and the second shunt unit 604.

Further, since the color temperature of the circuit during light emission can be adjusted by adjusting the first shunt unit 602 and the second shunt unit 604, the color temperature of the circuit during light emission can be adjusted even by adjusting one of the first shunt unit 602 and the second shunt unit 604. The color temperature can be adjusted by adjusting the first shunting unit 602 and the second shunting unit 604, and the dimming and color temperature adjusting device is simple in operation and cost-saving compared with the replacement of the first lamp bead 106 and the second lamp bead 108.

Further, the range of the light emitting color temperature of the lamp can be adjusted by adjusting the first shunt unit 602 and the second shunt unit 604.

Referring to fig. 7, in the fifth embodiment of the present application, the first shunting unit 602 is replaced by a third shunting unit 702, and the second shunting unit 604 is replaced by a fourth shunting unit 704. Specifically, the third shunting unit 702 is disposed in the first lamp bead branch 102, one end of the third shunting unit 702 is connected to the PWM dimming power supply 110, and the other end of the third shunting unit 702 is connected to the ground terminal. Specifically, the fourth shunting unit 704 is disposed in the second lamp bead branch 104, one end of the fourth shunting unit 704 is connected to the PWM dimming power supply 110, and the other end of the fourth shunting unit 704 is connected to the ground terminal. Specifically, the third shunting unit 702 and the fourth shunting unit 704 are configured to adjust a ratio of currents flowing through the first lamp bead branch 102 and the second lamp bead branch 104.

Optionally, the third shunting unit 702 in the above-described embodiments may include a resistor R5. Alternatively, the resistance of the resistor R5 may be 180 Ω. Optionally, the fourth shunting unit 704 in the above-described embodiment may include a resistor R6. Alternatively, the resistance of the resistor R6 may be 150 Ω.

Specifically, the functions and effects of the third shunting unit 702 and the fourth shunting unit 704 are the same as those of the first shunting unit 602 and the second shunting unit of the previous embodiment, and are not described again here.

Referring to fig. 7, in an alternative embodiment of the present application, the dimming/color temperature adjusting circuit of the above embodiment further includes a first shunting unit 602 and a second shunting unit 604 in addition to the third shunting unit 702 and the fourth shunting unit 704. In this embodiment, the current dividing unit for adjusting the current of the first lamp bead branch 102 is divided into the first current dividing unit 602 and the third current dividing unit 702, so that the heat dissipation performance of the circuit can be enhanced. Similarly, in the above embodiment, the current dividing unit for adjusting the second bead branch 104 is divided into the second current dividing unit 604 and the fourth current dividing unit 704, so that the heat dissipation performance of the circuit can be enhanced.

Optionally, with reference to fig. 7, the two-wire input dimming/color temperature adjustment circuit according to the above embodiment may further include a first capacitor C1. Specifically, one end of the first capacitor C1 is connected to the common terminal of the first voltage dividing unit 122 and the second voltage dividing unit 124, and the other end of the first capacitor C1 is connected to the ground terminal. Optionally, the first capacitance C1 is 100 nF. Specifically, the first capacitor C1 can function to reduce ac ripple factor and smooth dc output in the circuit provided by the present application.

The first lamp bead and the second lamp bead are different in color temperature when emitting light, and different in feeling brought. Under the irradiation of the high-color-temperature light source, if the brightness is not high, a feeling of coldness is given to people; under the irradiation of the low color temperature light source, the brightness is too high, which gives a feeling of sultriness to people.

In an optional embodiment of the present application, on the basis of the above embodiment, the color temperature of the first lamp bead is higher than the color temperature of the second lamp bead. Therefore, the lower the brightness of the light source unit is, the lower the color temperature of the light source unit is, and the comfort of the user in the using process is improved.

In an alternative embodiment of the present application, a two wire input dimming and color temperature circuit supplies a constant voltage 24VPWM dimming power supply. The switch tube adopts an N-channel MOS tube. First lamp pearl branch road includes that four ways first lamp pearl are parallelly connected is divided, and every way first lamp pearl is divided and is included 7 first lamp pearls of establishing ties. The second lamp pearl branch road includes that four ways parallelly connected second lamp pearl is divided road, and every way second lamp pearl is divided road and is included 7 second lamp pearls of establishing ties. When the circuit board is distributed, the first lamp beads and the second lamp beads are distributed alternately. The color temperature of first lamp pearl is higher than the color temperature of second lamp pearl.

When the 24VPWM power output maximum duty cycle of adjusting luminance, PWM adjusts luminance the stable 24V direct current voltage of power output, and N channel MOS pipe switches on completely, and the luminous luminance of circuit is the biggest this moment, and the electric current of flowing through first lamp pearl and second lamp pearl is the same, and the colour temperature is the median of the first colour temperature of first lamp pearl and the second lamp pearl of second lamp pearl. Optionally, the first color temperature is 3000K, the second color temperature is 6000K, and the color temperature of the circuit is 4500K at this time.

When the 24VPWM dimming power supply outputs a duty ratio to perform dimming, the N-channel MOS tube is not completely conducted, so that the current flowing through the first lamp bead branch circuit is reduced more than the current flowing through the second lamp bead branch circuit, and the color temperature value displayed when the circuit emits light is reduced. It can be understood that the duty cycle of the pulse voltage output by the PWM dimming power supply is larger, the partial pressure of the N-channel MOS tube is larger, when the duty cycle of the pulse voltage is close to 5%, the current flowing through the first lamp bead branch is close to 0, only the second lamp bead of the second lamp bead branch emits light at the moment, and the color temperature value is lowest.

In an alternative embodiment of the present application, a lamp is provided, which may include the two-wire input dimming and dimming temperature adjusting circuit in the above embodiments.

In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A two-line input dimming and color temperature adjusting circuit is characterized by comprising:

the light source unit comprises a first lamp bead branch and a second lamp bead branch, the cathode end of the first lamp bead branch is connected with a grounding end, the cathode end of the second lamp bead branch is connected with the grounding end, the first lamp bead branch comprises at least one first lamp bead, the second lamp bead branch comprises at least one second lamp bead, the first lamp bead has a first color temperature when emitting light, the second lamp bead has a second color temperature different from the first color temperature when emitting light, and each first lamp bead and each second lamp bead are arranged adjacently on the circuit board;

the PWM dimming power supply is connected with the anode end of the first lamp bead branch and the anode end of the second lamp bead branch and is used for outputting pulse voltage with adjustable duty ratio so as to adjust the brightness of the first lamp bead branch and the second lamp bead branch;

the control unit comprises a first voltage division unit, a second voltage division unit and a switch tube, wherein the first end of the switch tube is connected with the cathode end of the first lamp bead branch, the second end of the switch tube is connected with the grounding end, the control end of the switch tube is connected with the PWM dimming power supply through the first voltage division unit, the second voltage division unit is connected with the grounding end, and the switch tube is switched on and off under the control of pulse voltage.

2. The two-wire input dimming and color temperature adjusting circuit according to claim 1, wherein the switch tube comprises an N-channel MOS tube, the first end of the switch tube is a drain electrode of the N-channel MOS tube, the second end of the switch tube is a source electrode of the N-channel MOS tube, and the control end is a gate electrode of the N-channel MOS tube.

3. The two-input dimming and color temperature adjusting circuit according to claim 1, wherein the first lamp bead branches comprise a plurality of first lamp bead branches connected in parallel, each first lamp bead branch comprises a plurality of first lamp beads connected in series, the second lamp bead branches comprise a plurality of second lamp bead branches connected in parallel, and each second lamp bead branch comprises a plurality of second lamp beads connected in series.

4. The two-wire input dimming and color temperature adjusting circuit according to claim 3, wherein the first lamp bead branches and the second lamp bead branches are the same in number.

5. The two-wire input dimming and color temperature adjusting circuit according to claim 4, wherein the number of the first lamp beads of the first lamp bead branch is the same as the number of the second lamp beads of the second lamp bead branch, and each first lamp bead and each second lamp bead are arranged adjacently on a circuit board.

6. The two-wire input dimming and color temperature adjusting circuit according to claim 1, further comprising a first shunt unit and a second shunt unit, wherein one end of the first shunt unit is connected to the second end of the switching tube, the other end of the first shunt unit is connected to a ground terminal, one end of the second shunt unit is connected to the cathode terminal of the second lamp bead branch, the other end of the second shunt unit is connected to the ground terminal, and the first shunt unit and the second shunt unit are used for adjusting the proportion of the current flowing through the first lamp bead branch and the second lamp bead branch.

7. The two-wire input dimming and color temperature adjusting circuit according to claim 1 or 6, further comprising a third shunt unit and a fourth shunt unit, wherein the third shunt unit is disposed on the first lamp bead branch, one end of the third shunt unit is connected to the PWM dimming power supply, the other end of the third shunt unit is connected to a ground terminal, the fourth shunt unit is disposed on the second lamp bead branch, one end of the fourth shunt unit is connected to the PWM dimming power supply, the other end of the fourth shunt unit is connected to the ground terminal, and the third shunt unit and the fourth shunt unit are used for adjusting a ratio of currents flowing through the first lamp bead branch and the second lamp bead branch.

8. The two-wire input dimming and color temperature adjusting circuit according to claim 1, further comprising a first capacitor, wherein one end of the first capacitor is connected to a common terminal of the first voltage division unit and the second voltage division unit, and the other end of the first capacitor is connected to a ground terminal.

9. The two-wire input dimming and color temperature adjusting circuit according to claim 1, wherein the color temperature of the first lamp bead is higher than the color temperature of the second lamp bead.

10. A luminaire comprising a two-wire input dim and dim temperature circuit according to any one of claims 1-9.