CN112533329B - Light and color temperature adjusting circuit of constant current power supply and overlapped PWM (pulse-width modulation) color temperature adjusting method - Google Patents

Light and color temperature adjusting circuit of constant current power supply and overlapped PWM (pulse-width modulation) color temperature adjusting method Download PDF

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CN112533329B
CN112533329B CN202011363216.6A CN202011363216A CN112533329B CN 112533329 B CN112533329 B CN 112533329B CN 202011363216 A CN202011363216 A CN 202011363216A CN 112533329 B CN112533329 B CN 112533329B
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color temperature
pwm signal
duty ratio
pwm
positive duty
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CN112533329A (en
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郑德华
赵显云
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Zhuhai Shengchang Electronics Co ltd
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Zhuhai Shengchang Electronics Co ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

The invention discloses a light and color temperature adjusting circuit of a constant current power supply and an overlapped PWM (pulse-width modulation) color temperature adjusting method, wherein light and color temperature adjustment can be realized by using one constant current power supply, and meanwhile, during color temperature adjustment, an overlapped positive duty ratio is formed between a PWM signal 1 and a PWM signal 2, so that the condition that the output voltage is increased to the no-load voltage of a constant current source in the neutral period because of the neutral period when the PWM signal 1 and the PWM signal 2 are switched can be avoided, and when the color temperature is switched to another group of light strings, the lamp is damaged due to high voltage, so that a light and color temperature adjusting scheme with low cost and high reliability can be realized.

Description

Light and color temperature adjusting circuit of constant current power supply and overlapped PWM (pulse-width modulation) color temperature adjusting method
Technical Field
The invention relates to the technical field of light and color temperature adjustment of lamps, in particular to a light and color temperature adjustment circuit of a constant current power supply and an overlapped PWM color temperature adjustment method.
Background
Along with the improvement of living standard of people, the requirement on light is higher and higher, the requirement on light modulation and color temperature modulation becomes a basic requirement of people on choosing lamps, in the prior art, two independent constant current sources are adopted for light modulation and color temperature modulation, the light modulation and color temperature modulation is realized by respectively controlling the current of the two constant current sources, and the mode has the defects of higher cost, more complex circuits and components, inconvenience for miniaturization and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a light and color temperature adjusting circuit of a constant current power supply and an overlapped PWM color temperature adjusting method.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows: the utility model provides a constant current power supply's mixing of colors temperature circuit of adjusting luminance, includes constant current power supply and colour temperature lamps and lanterns, the colour temperature lamps and lanterns include high colour temperature lamp cluster LED1 and low colour temperature lamp cluster LED2, constant current power supply is including control module, MOS pipe Q1 and MOS pipe Q2, control module's output respectively with the anodal of high colour temperature lamp cluster LED1 and the anodal electricity of low colour temperature lamp cluster LED2 are connected, control module's control end respectively with MOS pipe Q1's grid and MOS pipe Q2's grid electricity are connected, MOS pipe Q1's source electrode and MOS pipe Q2's source electrode ground connection, MOS pipe Q1's drain electrode and high colour temperature lamp cluster LED 1's negative pole electricity are connected, MOS pipe Q2's drain electrode and low colour temperature lamp cluster LED 2's negative pole electricity are connected, control module exports PWM signal 1 and PWM signal 2 come the lamp cluster conduction degree of control MOS pipe Q1 and MOS pipe Q2 respectively to adjust the colour temperature of high colour temperature LED1 and low colour temperature LED 2's lamp cluster.
Further, the control module includes:
the electromagnetic filter circuit is electrically connected with an external power supply;
the switching power supply circuit is electrically connected with the output end of the electromagnetic filter circuit;
the DC/DC constant current circuit is respectively and electrically connected with the output end of the switching power supply circuit, the anode of the high-color-temperature light string LED1, the anode of the low-color-temperature light string LED2 and the grounding end;
the control signal processing circuit can receive and process an external control signal;
and the input end of the singlechip control circuit is electrically connected with the output end of the control signal processing circuit, and the output end of the singlechip control circuit is respectively electrically connected with the DC/DC constant current circuit, the grid of the MOS tube Q1 and the grid of the MOS tube Q2.
An overlapped PWM color temperature adjusting method of a constant current power supply is applied to a light and color temperature adjusting circuit of the constant current power supply;
setting the overlapping positive duty ratio of the PWM signals 1 and 2 to be X%, wherein 0 & ltx & gt & lt 50 & gt, and the sum of the positive duty ratio of the PWM signals 1 and the positive duty ratio of the PWM signals 2 > =100% of PWM period;
the color temperature adjusting method is divided into a method of decreasing a color temperature and a method of increasing a color temperature, wherein the method of decreasing a color temperature includes the following 3 stages:
the first stage is as follows:
when the PWM signal 1 outputs 100% positive duty ratio and the PWM signal 2 outputs 0% positive duty ratio, the color temperature of the lamp is the highest; the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, when the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, the PWM signal 1 always outputs 100 percent positive duty ratio, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100 percent, and the color temperature is reduced;
and a second stage:
the positive duty ratio of the PWM signal 2 is increased to 100% from X% multiplied by 2, the positive duty ratio of the PWM signal 1 is reduced to X% multiplied by 2 from 100%, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped, and when the PWM signal 1 has a rising edge and passes through the X% duty ratio, the PWM signal 2 has a falling edge; when the PWM signal 2 has a rising edge and passes through the X% duty ratio, the PWM signal 1 has a falling edge, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped twice in one period, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100%, and the color temperature is further reduced;
and a third stage:
the positive duty ratio of the PWM signal 1 is reduced to 0% from X% multiplied by 2, the PWM signal 2 always outputs 100% positive duty ratio, and the color temperature is further reduced; when the positive duty ratio of the PWM signal 1 is reduced to 0% and the PWM signal 2 outputs 100% of the positive duty ratio, the color temperature of the lamp is the lowest;
the method of raising the color temperature is opposite to the method of lowering the color temperature.
The invention has the beneficial effects that: a constant current power supply dimming and color temperature adjusting circuit and an overlapped PWM color temperature adjusting method can realize dimming and color temperature adjustment by using one constant current power supply, and simultaneously, when the color temperature is adjusted, the PWM signal 1 and the PWM signal 2 have overlapped positive duty ratio, so that the condition that the output voltage is increased to the no-load voltage of a constant current source in the neutral period due to the occurrence of the neutral period when the PWM signal 1 and the PWM signal 2 are switched can be avoided, and when the other group of color temperature lamp strings are switched, the lamp is damaged due to high voltage, so that a low-cost and high-reliability dimming color temperature scheme can be realized.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a dimming and color temperature adjusting circuit of a constant current power supply;
FIG. 2 is a waveform diagram showing the highest color temperature;
FIG. 3 is a waveform diagram of a first stage of reducing color temperature;
FIG. 4 is a waveform diagram of a first embodiment of a second stage of reducing color temperature;
FIG. 5 is a waveform diagram of a second embodiment of a second stage of reducing color temperature;
FIG. 6 is a waveform diagram of a third stage of reducing color temperature;
fig. 7 is a waveform diagram at the lowest color temperature.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, a plurality of means is two or more, and greater than, less than, more than, etc. are understood as excluding the present number, and greater than, less than, etc. are understood as including the present number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless explicitly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be understood in a broad sense, and for example, may be directly connected or indirectly connected through an intermediate; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either as communication within the two elements or as an interactive relationship of the two elements. The technical field can reasonably determine the specific meaning of the words in the invention by combining the specific contents of the technical scheme.
Referring to fig. 1, a light and color temperature adjusting circuit of a constant current power supply comprises a constant current power supply 10 and a color temperature lamp, wherein the color temperature lamp comprises a high color temperature lamp string LED1 and a low color temperature lamp string LED2, the constant current power supply 10 comprises a control module 11, an MOS transistor Q1 and an MOS transistor Q2, an output end of the control module 11 is electrically connected with an anode of the high color temperature lamp string LED1 and an anode of the low color temperature lamp string LED2 respectively, a control end of the control module 11 is electrically connected with a gate of the MOS transistor Q1 and a gate of the MOS transistor Q2 respectively, a source of the MOS transistor Q1 and a source of the MOS transistor Q2 are grounded, a drain of the MOS transistor Q1 is electrically connected with a cathode of the high color temperature lamp string LED1, a drain of the MOS transistor Q2 is electrically connected with a cathode of the low color temperature lamp string LED2, and the control module 11 can output a PWM signal 1 and a PWM signal 2 to control conduction degree of the MOS transistor Q1 and the MOS transistor Q2 respectively, so as to adjust color temperature of the high color temperature lamp string LED1 and the low color temperature lamp string LED 2.
The control module 11 includes:
an electromagnetic filter circuit 111 electrically connected to an external power supply;
a switching power supply circuit 112 electrically connected to an output terminal of the electromagnetic filter circuit 111;
the DC/DC constant current circuit 113 is respectively and electrically connected with the output end of the switching power supply circuit 112, the anode of the high-color-temperature light string LED1, the anode of the low-color-temperature light string LED2 and the grounding end;
a control signal processing circuit 114 that receives and processes an external control signal;
and a single chip microcomputer control circuit 115, an input end of which is electrically connected with an output end of the control signal processing circuit 114, and an output end of which is electrically connected with the DC/DC constant current circuit 113, the gate of the MOS transistor Q1, and the gate of the MOS transistor Q2, respectively.
Referring to fig. 2-7, an overlapped PWM color temperature adjusting method of a constant current power supply is applied to the light and color temperature adjusting circuit of the constant current power supply;
setting the positive duty ratio of overlapping of the PWM signals 1 and 2 to be X%, wherein 0 & lt X & gt 50 & lt, and the sum of the positive duty ratio of the PWM signals 1 and the positive duty ratio of the PWM signals 2 > =100% of PWM period;
the color temperature adjusting method is divided into a method of decreasing a color temperature and a method of increasing a color temperature, wherein the method of decreasing a color temperature includes the following 3 stages:
the first stage is as follows:
when the PWM signal 1 outputs 100% positive duty ratio and the PWM signal 2 outputs 0% positive duty ratio, the color temperature of the lamp is the highest; the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, when the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, the PWM signal 1 always outputs 100 percent positive duty ratio, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100 percent, and the color temperature is reduced;
and a second stage:
the positive duty ratio of the PWM signal 2 is increased to 100% from X% multiplied by 2, the positive duty ratio of the PWM signal 1 is reduced to X% multiplied by 2 from 100%, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped, and when the PWM signal 1 has a rising edge and passes through the X% duty ratio, the PWM signal 2 has a falling edge; when the PWM signal 2 has a rising edge and passes through the X% duty ratio, the PWM signal 1 has a falling edge, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped twice in one period, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100%, and the color temperature is further reduced;
and a third stage:
the positive duty ratio of the PWM signal 1 is reduced to 0% from X% multiplied by 2, the PWM signal 2 always outputs 100% positive duty ratio, and the color temperature is further reduced; when the positive duty ratio of the PWM signal 1 is reduced to 0% and the PWM signal 2 outputs 100% positive duty ratio, the color temperature of the lamp is the lowest;
specifically, when the color temperature of the lamp is the highest and the lowest, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is equal to 100%, in the second stage, when the PWM signal 1 has a rising edge and passes through the X% duty ratio, the PWM signal 2 has a falling edge, and at this time, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped by the X% duty ratio; when the PWM signal 2 has a rising edge and the X% duty ratio is passed, the PWM signal 1 has a falling edge, and the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped by the X% duty ratio; the positive duty cycles of PWM signal 1 and PWM signal 2 overlap twice within one period, i.e., X% × 2.
The waveform shown in fig. 2 is that the PWM signal 1 outputs 100%, the PWM signal 2 outputs 0%, and the color temperature of the lamp is the highest at this time; FIG. 3 shows a waveform in which the positive duty ratio of the PWM signal 2 is increased to X% × 2, the PWM signal 1 outputs 100% positive duty ratio, and the color temperature of the lamp is decreased; fig. 4 shows a waveform in which the positive duty cycle of the PWM signal 1 is decreased from 100%, the positive duty cycle of the PWM signal 2 is increased to the same positive duty cycle as the PWM signal 1, and the color temperature of the lamp is further decreased; the waveform shown in fig. 5 is that the positive duty cycle of the PWM signal 1 is further decreased, the positive duty cycle of the PWM signal 2 is further increased to be larger than the positive duty cycle of the PWM signal 1, and the color temperature of the lamp is further decreased; fig. 6 shows waveforms in which the positive duty ratio of the PWM signal 2 is increased to 100%, the positive duty ratio of the PWM signal 1 is decreased to X% × 2, and the color temperature of the lamp is further decreased; fig. 7 shows a waveform in which when the PWM signal 1 outputs 0% and the PWM signal 2 outputs 100%, the color temperature of the lamp is the lowest; as shown in fig. 2-7, the sum of the positive duty cycles of the PWM signal 1 and the PWM signal 2 is greater than or equal to 100%; as shown in fig. 3-6, there is a positive duty cycle overlap of X% X2 between PWM signal 1 and PWM signal 2 for each PWM period.
The method for increasing the color temperature is opposite to the method for reducing the color temperature; the method comprises the following specific steps:
the first stage is as follows:
the PWM signal 2 outputs 100% positive duty ratio, and when the PWM signal 1 outputs 0% positive duty ratio, the color temperature of the lamp is the lowest; the positive duty ratio of the PWM signal 1 is increased from 0 percent to X percent multiplied by 2, when the positive duty ratio of the PWM signal 1 is increased from 0 percent to X percent multiplied by 2, the PWM signal 2 always outputs 100 percent positive duty ratio, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100 percent, and the color temperature is increased;
and a second stage:
the positive duty ratio of the PWM signal 1 is increased to 100% from X% multiplied by 2, the positive duty ratio of the PWM signal 2 is reduced to X% multiplied by 2 from 100%, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped, and when the PWM signal 2 has a rising edge and passes through the X% duty ratio, the PWM signal 1 has a falling edge; when the PWM signal 1 has a rising edge and the X% duty ratio is passed, the PWM signal 2 has a falling edge, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped twice in one period, and the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100%, so that the color temperature is further increased;
and a third stage:
the positive duty ratio of the PWM signal 2 is reduced to 0% from X% multiplied by 2, the PWM signal 1 always outputs 100% positive duty ratio, and the color temperature is further increased; the positive duty ratio of the PWM signal 2 is reduced to 0%, and when the PWM signal 1 outputs 100% positive duty ratio, the color temperature of the lamp is the highest.
The circuit and the color temperature adjusting method can realize the color temperature adjustment and the color temperature adjustment by using one constant current source, and simultaneously, the PWM signal 1 and the PWM signal 2 have overlapped positive duty ratio during the color temperature adjustment, so that the condition that the output voltage is increased to the no-load voltage of the constant current source during the neutral period because the neutral period occurs when the PWM signal 1 and the PWM signal 2 are switched can be avoided, and when the other group of color temperature lamps are switched, the lamps are damaged due to the high voltage; therefore, a low-cost and high-reliability dimming color temperature scheme can be realized.
The present invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are included in the scope of the present invention defined by the claims.

Claims (2)

1. An overlapped PWM color temperature adjusting method of a constant current power supply is applied to a light and color temperature adjusting circuit of the constant current power supply, and is characterized in that:
the light and color temperature adjusting circuit of the constant current power supply comprises a constant current power supply (10) and a color temperature lamp, the color temperature lamp comprises a high color temperature lamp string LED1 and a low color temperature lamp string LED2, the constant current power supply (10) comprises a control module (11), an MOS tube Q1 and an MOS tube Q2, the output end of the control module (11) is respectively and electrically connected with the anode of the high color temperature lamp string LED1 and the anode of the low color temperature lamp string LED2, the control end of the control module (11) is respectively and electrically connected with the grid of the MOS tube Q1 and the grid of the MOS tube Q2, the source of the MOS tube Q1 and the source of the MOS tube Q2 are grounded, the drain of the MOS tube Q1 is electrically connected with the cathode of the high color temperature lamp string LED1, the drain of the MOS tube Q2 is electrically connected with the cathode of the low color temperature lamp string LED2, and the control module (11) can output PWM (pulse width modulation) signals 1 and PWM (pulse width modulation) 2 to respectively control the conduction degree of the MOS tube Q1 and the MOS tube Q2 so as to adjust the color temperature of the high color temperature lamp string LED1 and the low color temperature lamp string LED 2;
the overlapped PWM color temperature adjusting method of the constant current power supply comprises the following steps:
setting the positive duty ratio of overlapping of the PWM signals 1 and 2 to be X%, wherein 0 & lt X & gt 50 & lt, and the sum of the positive duty ratio of the PWM signals 1 and the positive duty ratio of the PWM signals 2 > =100% of PWM period;
the color temperature adjusting method is divided into a method of decreasing a color temperature and a method of increasing a color temperature, wherein the method of decreasing a color temperature includes the following 3 stages:
the first stage is as follows:
when the PWM signal 1 outputs 100% positive duty ratio and the PWM signal 2 outputs 0% positive duty ratio, the color temperature of the lamp is the highest; the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, when the positive duty ratio of the PWM signal 2 is increased from 0 percent to X percent multiplied by 2, the PWM signal 1 always outputs 100 percent positive duty ratio, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100 percent, and the color temperature is reduced;
and a second stage:
the positive duty ratio of the PWM signal 2 is increased to 100% from X% multiplied by 2, the positive duty ratio of the PWM signal 1 is reduced to X% multiplied by 2 from 100%, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped, and when the PWM signal 1 has a rising edge and passes through the X% duty ratio, the PWM signal 2 has a falling edge; when the PWM signal 2 has a rising edge and passes through the X% duty ratio, the PWM signal 1 has a falling edge, the positive duty ratios of the PWM signal 1 and the PWM signal 2 are overlapped twice in one period, the sum of the positive duty ratios of the PWM signal 1 and the PWM signal 2 is more than 100%, and the color temperature is further reduced;
and a third stage:
the positive duty ratio of the PWM signal 1 is reduced to 0% from X% multiplied by 2, the PWM signal 2 always outputs 100% positive duty ratio, and the color temperature is further reduced; when the positive duty ratio of the PWM signal 1 is reduced to 0% and the PWM signal 2 outputs 100% of the positive duty ratio, the color temperature of the lamp is the lowest;
the method of raising the color temperature is reversed from the method of lowering the color temperature.
2. The overlapped PWM color temperature adjustment method for the constant current power supply according to claim 1, wherein the control module (11) comprises:
an electromagnetic filter circuit (111) electrically connected to an external power supply;
a switching power supply circuit (112) electrically connected to an output terminal of the electromagnetic filter circuit (111);
the DC/DC constant current circuit (113) is respectively and electrically connected with the output end of the switching power supply circuit (112), the anode of the high-color-temperature light string LED1, the anode of the low-color-temperature light string LED2 and the grounding end;
a control signal processing circuit (114) that receives and processes an external control signal;
and the input end of the singlechip control circuit (115) is electrically connected with the output end of the control signal processing circuit (114), and the output end of the singlechip control circuit is electrically connected with the DC/DC constant current circuit (113), the grid of the MOS tube Q1 and the grid of the MOS tube Q2 respectively.
CN202011363216.6A 2020-11-27 2020-11-27 Light and color temperature adjusting circuit of constant current power supply and overlapped PWM (pulse-width modulation) color temperature adjusting method Active CN112533329B (en)

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CN103929852A (en) * 2014-03-31 2014-07-16 深圳市九洲光电科技有限公司 LED lamp with light and color capable of being adjusted
CN204231701U (en) * 2014-10-16 2015-03-25 深圳市阿达电子有限公司 A kind of energy-conservation eyeshield LED stepless dimming color-temperature regulating circuit
CN104812146B (en) * 2015-05-15 2017-08-04 北京易方通达科技有限公司 It is parallel to the radio controllable LED multi-path light modulation toning control method of current source
CN109076663B (en) * 2016-04-22 2021-05-04 昕诺飞控股有限公司 Method for controlling lighting device, lighting control circuit and lighting system
CN106604448B (en) * 2016-11-24 2018-11-30 江西美的贵雅照明有限公司 A kind of light modulation toning control circuit and LED illumination product
CN209627758U (en) * 2018-12-24 2019-11-12 佛山冠今光电科技有限公司 A kind of LED control circuit of compatible light modulation color-temperature regulating

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