TW201605289A - An LED illumination control circuit has various different color temperatures by using an AC switch to switching - Google Patents

Abstract

An LED illumination control circuit has various different color temperatures by using an AC switch to switching. It includes an AC source and a wave generator connected to the source. A power supply connects to the source. A first LED lamp set and a second LED lamp set receive power from the power supply to drive the first and second LED lamp sets. The color temperature of the second LED lamp set is different from the first LED lamp set. A microprocessor receives power from the power supply to drive itself and driving signals from the wave generator. A first switch circuit and a second first switch circuit connect to the LED lamp sets to open or close its lighting. The switch circuit is connected to the microprocessor to receive the output signal to actuate or de-actiate the first LED lamp set and second LED lamp set. A first switch circuit and a second first switch circuit also control the currents of the first and second LED lamp sets, respectively, to adjust the illumination of the LED lamp. The present invention includes two kind of operation modes; one is manual operation mode, and the other is sensing operation mode.

Description

LED lighting control circuit with variable color temperature through AC switch

The invention relates to the field of LED illumination and control, in particular to an LED illumination control circuit capable of variable multiple color temperatures through an AC switch and a method for controlling LED illumination.

The LED lighting products currently on the market mainly include warm light (2700K-3500K color temperature), warm white light (4000K-5000K color temperature), cool white light (5500K-6500K color temperature) three color temperature LED lights, which can only be used in one LED lighting product. A color temperature light is emitted, and the intelligent human body induction LED lamp also agrees. If three color temperature lights are emitted, three color temperature LED lamp beads are required, and each of the three color temperature LED lighting products requires a set of aluminum housing for heat dissipation. , plastic insulating sleeve, LED lamp bead, heat-dissipating aluminum substrate, light-transmitting lamp cover, LED driving power supply, human body signal sensor, human body signal amplifier, light sensitive detector, Fresnel lens, lamp holder, connecting wire, fixing screw and Thermal adhesive, etc. These three color temperature LEDs require three sets of raw materials. This is a waste of resources, cost, manpower, materials, production hours, transportation costs are also relatively high, not low carbon, not environmentally friendly. And for different regions of the user will use different color temperature LED lighting products and smart human body sensing LED lighting products, single color temperature LED lighting to And fixed-mode lighting is not conducive to the promotion and popularization of manufacturers and LED lighting products.

Therefore, the prior art has yet to be improved and developed.

The technical problem to be solved by the present invention is to provide an LED lighting control circuit capable of changing a plurality of color temperatures through an AC switch and a method for controlling the LED illumination thereof by using an AC switch, so that one LED circuit realizes three color temperature LED illuminations and through sensing The ambient light intensity and the wireless signal of the external object control the illumination of the LED light group, so as to save cost, to meet the needs of users in different regions and different environments, and to facilitate the promotion and popularization of LED lighting products.

The technical solution adopted by the present invention to solve the technical problem is as follows:

An LED lighting control circuit capable of variable color temperature through an AC switch, comprising an LED lighting circuit capable of realizing three color temperature changes and an LED driving power source for driving the LED lighting circuit, the LED lighting circuit comprising an optical coupling circuit, and the light a microprocessor connected to the coupling circuit, a first LED lamp group connected to the microprocessor, a first switch circuit connected to the first LED lamp group and used to drive the first LED lamp group, a second LED lamp group, and a second switch circuit connected to the second LED lamp group and a power supply driving circuit for driving the microprocessor, the first LED lamp group and the second LED lamp group, wherein A sensing circuit is also included, the sensing circuit includes a light sensitive sensor for sensing ambient light intensity respectively connected to the microprocessor A detector and a moving object sensing circuit for sensing a wireless signal.

This case has two different modes of operation. One is a manual operation mode in which the user applies the operation at the driving power source, and the system of the present invention is set to the manual operation mode, wherein a dimmer or an AC switch is connected to the driving power source, and the waveform generator is connected to the driving. Between the power supply and the power drive circuit for dimming. At this time, in the corresponding switch-on setting of the processor, the LED light group is set to accept only the manual operation of the user to determine the state in which the LED light group emits light or does not emit light. At this time, the driving signal enters the microprocessor via the waveform generator, and then the microprocessor controls the switching circuit to turn the LED group on or off.

Another operation mode is an inductive operation mode in which the user applies the operation at the driving power source, and sets the system of the present invention to the sensing operation mode. At this time, the LED light group is set only in the corresponding switch opening setting of the processor. The sensing signal from the sensing circuit is received to determine the state of illumination or non-lighting of the LED light group. At this time, the driving signal enters the microprocessor via the sensing circuit, and then the microprocessor controls the switching circuit to turn the LED group on or off.

The LED illumination control circuit and the LED illumination control method capable of changing multiple color temperatures by the AC switch provided by the invention not only realize the light of different color temperatures emitted by the LED lamp group, but also realize the light of different color temperatures in the LED lamp group. By controlling the ambient light intensity and the wireless signal of the external object to control the LED light group illumination, the automatic control of the LED light group illumination is realized, and the festival is achieved. The purpose of environmental protection.

The features of the present invention and its advantages are further understood from the following description, and reference is made to the accompanying drawings.

10‧‧‧Drive power supply

20‧‧‧ Waveform Generator

20‧‧‧Optical coupling circuit

30‧‧‧Power drive circuit

31‧‧‧AC to DC circuit

32‧‧‧Variable circuit

40‧‧‧Microprocessor

42‧‧‧ third signal input

43‧‧‧second signal input

51‧‧‧First LED light group

52‧‧‧First switch circuit

61‧‧‧Second LED light group

62‧‧‧Second switch circuit

70‧‧‧Induction circuit

71‧‧‧Photosensitive sensor

72‧‧‧Mobile object sensing circuit

101‧‧‧AC input

102‧‧‧Dimmer

401‧‧‧Manual operation mode

402‧‧‧Induction mode

721‧‧‧Signal Amplifier

722‧‧‧Radio wave sensor

4011‧‧‧Switch on setting

4021‧‧‧Switch on setting

1 is a schematic block diagram of an LED illumination control circuit capable of variable multiple color temperatures through an AC switch according to the present invention.

2 is a schematic block diagram of a preferred embodiment of an LED illumination control circuit that can vary a plurality of color temperatures through an AC switch provided by the present invention.

FIG. 3 is a schematic block diagram of still another embodiment of an LED illumination control circuit capable of variable multiple color temperatures through an AC switch according to the present invention.

4 is a flow chart of a method for controlling LED illumination using the LED inductive illumination control circuit shown in FIGS. 1-3 provided by the present invention.

The present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Please refer to FIG. 1 , which shows an LED lighting control circuit with variable color temperature through an AC switch of the present invention. The circuit can be widely used in the field of illumination, including a bulb lamp, a down lamp, a ceiling lamp, a fluorescent tube, and a panel lamp. smallpox Lights, PAR lights, corn lights, oil lamps, high bay lights, etc., contain the following components:

A driving power source 10; the driving power source 10 is an alternating current driving power source.

A waveform generator 20 is connected to the driving power source 10, and the signal of the driving power source 10 is applied to generate a required driving waveform.

A power source driving circuit 30 is connected to the driving power source 10, converts the power from the driving power source 10 into an analog signal and performs a voltage stabilizing operation to provide other circuit components as a driving power source.

A first LED lamp group 51 receives power from the power source driving circuit 30 as driving power.

A second LED lamp group 61 receives power from the power source driving circuit 30 as driving power; wherein the color temperature of the second LED lamp group 61 is different from the color temperature of the first LED lamp group 51. For example, the color temperature of the second LED lamp group 51 is white, and the color temperature of the first LED lamp group 61 is yellow; A microprocessor 40 receives power from the power supply driving circuit 30 as its own driving power, and the microprocessor 40 receives a driving signal from the waveform generator 20.

A first switch circuit 52 is connected to the LED lamp group 51 for turning on or off the LED lamp group 51 to emit light or stop emitting light; the first switch circuit 52 is connected to the microprocessor 40 to receive the microprocessor 40. Outputting a signal, so that the first LED group 51 can be turned on or off, and the first switch circuit 52 can also control the current flowing through the first LED lamp set 51 to control the brightness of the first LED lamp set 51.

A second switch circuit 62 is connected to the second LED lamp group 61 for turning on or off the second LED lamp group 61 to emit light or stop emitting light; the second switch circuit 62 is connected to the microprocessor 40 to receive from the micro The output signal of the processor 40 can thus turn the second LED group 61 on or off, and the second switch circuit 62 can also control the current flowing through the second LED group 61 to control the second LED group 61. Brightness.

This case has two different modes of operation.

Manual operation mode 401

As shown in FIG. 2, the user applies the operation at the driving power source 10, and sets the system of the present invention to the manual operation mode 401, wherein a dimmer is connected to the driving power source, and the waveform generator is connected to the driving power source. The power drive circuit is used for dimming. At this time, the LED lamp group 51 is set in the corresponding switch ON setting 4011 of the processor 40, and only the manual operation of the user is accepted to determine the state in which the LED lamp groups 51, 61 are illuminated or not. At this time, the driving signal enters the microprocessor 40 via the waveform generator 20, and then the switching circuit 52, 62 is controlled by the microprocessor 40 to turn the LED lamp group 51, 61 on or off.

Induction mode of operation 402

As shown in FIG. 3, the user applies the operation at the driving power source 10, and sets the system of the present invention to the sensing operation mode 402. At this time, the LED light group 51 is set in the corresponding switch opening setting 4021 of the processor 40. The 61 receives only the sensing signal from the sensing circuit 70 to determine the state in which the LEDs 51, 61 are illuminated or not. At this time, the driving signal enters the microprocessor 40 via the sensing circuit 70, and then the switching circuit 52, 62 is controlled by the microprocessor 40 to turn the LED group 51, 61 on or off.

As shown in FIG. 3, the sensing circuit 70 is connected to the microprocessor 40. The sensing circuit 70 can sense changes in the external environment and transmit an inductive signal to the microprocessor 40 to enable the microprocessor 40 to control the switch. The LEDs 51, 61 are turned on or off by the circuits 52, 62.

The circuit configuration of one of the manual operation modes 401 of the present invention will be described below. The circuit configurations that can achieve the above functions are all within the scope of the present invention and are not limited by the following embodiments.

In order to better illustrate the invention, it will be further described in conjunction with the embodiments and drawings.

As shown in FIG. 4, there is shown an LED device for realizing tone-modulated light through a dimmer, comprising an AC input terminal 101 (for implementing the driving power supply of FIG. 2) 10), a dimmer 102, a power drive circuit 30, an optical coupling circuit 20 (for implementing the waveform generator 20 of FIG. 2), and a microprocessor 40, the AC input terminal 101 and the dimmer 102 The dimmers 102 are respectively connected to the optical coupling circuit 20 and the power supply driving circuit 30. The optical coupling circuit 20 and the power supply driving circuit 30 are connected to the microprocessor 40. The microprocessor 40 is connected to the first LED lamp group 51 through the first switch circuit 52. The microprocessor 40 is connected to the second LED lamp group 61 through the second switch circuit 62. The power supply driving circuit 30 respectively The driving power supply is provided for the microprocessor 40, the first LED lamp group 51 and the second LED lamp group 61; the power driving circuit 30 includes an AC-DC circuit 31 and a voltage stabilizing circuit 32, and the input terminal of the voltage stabilizing circuit 32 The output terminal of the AC-DC circuit 31 is connected; the first switch circuit 52 is a field effect transistor, and the second switch circuit 62 is also a field effect transistor; the first LED lamp group 51 and the positive electrode of the second LED lamp group 61 Connected to the anode of the output end of the power driving circuit 30 respectively, the cathodes of the first LED lamp group and the second LED lamp group are respectively connected to the drain of the first field effect transistor 52 and the drain of the second field effect transistor 62. Connected. The source of the first field effect transistor 52 and the source of the second field effect transistor 62 are respectively connected to the negative terminal of the output end of the power supply driving circuit 30. The gate of the first field effect transistor 52 is connected to the first pulse width modulation signal output end of the microprocessor 40, and the gate of the second field effect transistor 62 Connected to the second pulse width modulated signal output of microprocessor 40.

As shown in FIG. 4, the AC input terminal 101 of the LED lighting device is a three-phase driving power source, including a live line, a neutral line, and a ground line. The optical coupling circuit 20 has an input pin connected to the neutral line of the AC input terminal 101. The other input is connected to the live line of the AC input terminal 101 via the dimmer 102. One of the output pins of the optical coupling circuit 20 is coupled to the signal input of the microprocessor 40, that is, AD1 of the microprocessor 40. The AD1 is an A/D conversion port of the microprocessor 40. The signal output from the optical coupling circuit 20 is a square wave signal. In order to facilitate the on/off control of the switching circuit by the microprocessor 40, the output of the optical coupling circuit 20 needs to be connected to the AD1 of the microprocessor 40 to convert the analog signal into a digital signal. The other output of the optical coupling circuit 20 is connected to the negative terminal of the output of the power supply driving circuit 30. The square wave signal outputted by the optical coupling circuit 20 to the microprocessor 40 AD1埠 is generated as follows: the optical coupling circuit 20 is connected to the alternating current input terminal, and flows through the light emitting diode in the input end of the optical coupling circuit 20 when the alternating current is in the positive half cycle. When the positive electrode is turned on, the light-emitting diode starts to emit light, and the triode inside is turned on, and the signal of AD1埠 changes from the original high potential to the low potential. When the alternating current flows for a negative half cycle, the light-emitting diode stops working, and the light-emitting diode The body does not emit light to make the transistor non-conducting, and thus the signal of AD1埠 is changed from the original low potential to the high potential, so that the alternating current is passed through the input pin of the optical coupling circuit, so that the output terminal pin outputs a square wave signal.

In this embodiment, the power driving circuit 30 includes an alternating current to direct current The circuit 31 and a voltage stabilizing circuit 32, wherein the input end of the AC-DC circuit 31 is connected to the AC input terminal 101, and the output end of the AC-DC circuit 31 is connected to the input terminal of the voltage stabilizing circuit 32. The output of the regulator circuit 32 is coupled to the voltage input of the microprocessor 40 to provide the microprocessor 40 with an operating voltage Vcc. The voltage stabilizing circuit 32 is a low-dropout linear voltage stabilizing integrated circuit. The AC-DC circuit 31 converts the AC power provided by the AC input terminal 101 into DC power, and generates a constant voltage constant current signal. The magnitude of the voltage and current can be adjusted by the AC-DC circuit 31, and the output end of the AC-DC circuit 31 is further The first LED lamp group 51 and the second LED lamp group 61 are connected to provide a working driving power source for the first LED lamp group 51 and the second LED lamp group 61.

In this embodiment, the first LED lamp group 51 and the second LED lamp group 61 both include a plurality of LED lamps connected in series, and the number of LED lamps in the first LED lamp group 51 and the LED strings in the second LED lamp group 61 The number of the LED lamps in the first LED lamp group 51 is different from the color temperature of the LED lamps in the second LED lamp group 61. In the present invention, there are three options for the color temperature of the LED lamp, including cool white light, warm light, and warm white light. Therefore, in this embodiment, there are three options for color temperature matching. In this embodiment, a set of white LED lights and a set are selected. The group of warm white LED lights, that is, LED11-LED1N is selected as cool white light, LED21-LED2N is warm white light, the positive electrode of LED11 in the first LED lamp group 51 and the second LED lamp group 61 and the positive electrode of the output end of the power supply driving circuit 30 respectively. Connected, the positive terminal of the output terminal of the power driving circuit 30 is also the AC to DC circuit 31. The positive pole at the end.

In this embodiment, the first switch circuit 52 and the second switch circuit 62 are field effect transistors, respectively a first field effect transistor and a second field effect transistor, and the D field of the first field effect transistor and the The D poles of the second field effect transistor are respectively connected to the negative electrodes of the first LED lamp group 51 and the second LED lamp group 61. Here, the D pole of the first FET and the D pole of the second FET are connected to the negative poles of the LED 1N and the LED 2N, respectively. The S pole of the first field effect transistor and the S pole of the second field effect transistor are respectively connected to the negative pole of the output end of the power driving circuit 30, and the G pole of the first field effect transistor and the first pulse of the microprocessor 40 The wide modulated signal output is connected, and the G pole of the second FET is connected to the second pulse width modulated signal output of the microprocessor 40; the first pulse width modulated signal output of the microprocessor 40 and the second pulse The wide modulated signal output terminal provides a pulse width modulation signal to the first FET and the second FET, respectively, to control the on and off of the first FET and the second FET; the first pulse width of the microprocessor 40 The modulation signal output end and the second pulse width modulation signal output end generate a pulse width modulation signal without interruption, driving the first FET or the second FET to conduct, driving the first LED lamp group 51 to emit cold white light, or the second LED The light group 61 emits warm light, or the first LED light group 51 and the second LED light group 61 simultaneously emit light to generate warm white light.

In this case, the user can appropriately operate the dimmer 102 to cause the optical coupling circuit 20 to output a different number of square wave signals to the microprocessor 40 AD1 to control the microprocessor 40 to activate the first switch circuit 52 or The second switch Circuit 62. This can be easily done by those skilled in the art, and an example is given below to illustrate the details.

S100: the power supply driving circuit 30 outputs a constant voltage constant current signal to the microprocessor 40, the first LED lamp group 51 and the second LED lamp group 61 after the external alternating current is turned on; S200: the optical coupling circuit 20 is directed to the microprocessor The control signal input terminal of 40 outputs a square wave signal, and outputs a pulse width modulation signal to the first switch circuit 52 via the microprocessor 40, drives the first switch circuit 52 to be turned on, and controls the first LED lamp group 51 to transmit Cooling white light; adjusting the button size of the dimmer 102 to change the pulse width of the square wave signal output by the photocoupler 20, thereby realizing the brightness and darkness of the LED illumination; S300: when the LED is cold white, the switch is interrupted by the dimmer 102 AC power, causing the square wave signal of the control signal input end of the microprocessor to be at a low level, and outputting a pulse width modulation signal to the second switch circuit 62, driving the second switch circuit 62 to be turned on, and controlling the second LED light group 61 warm light, adjust the button size of the dimmer 102 to change the pulse width of the square wave signal output by the photocoupler 15, thereby achieving the brightness of the LED light.

S400: when the LED is warming light, the alternating current is interrupted by the dimmer 102 switch, so that the square wave signal of the control signal input end of the microprocessor 40 is at a low level, and simultaneously to the first switch circuit 52 and the second switch circuit. 62 outputting half of each of the pulse width modulation signals, driving the first switching circuit 52 and the second switching circuit 62 to be turned on, and controlling the first LED group 51 and the second LED group 61 Simultaneously illuminating to generate warm white light; adjusting the button size of the dimmer 102 to change the pulse width of the square wave signal output by the photocoupler, thereby achieving brightness and darkness of the LED light; S500: dimming when the LED is warming white light The switch 102 interrupts the alternating current, so that the square wave signal of the control signal input end of the microprocessor 40 is at a low level, and outputs a pulse width modulation signal to the first switch circuit 52, driving the first switch circuit 52 to be turned on, and controlling the first An LED light group 51 emits cool white light, returns to the initial mode, and a loop ends.

In this case, the dimmer can also be an AC switch (not shown in the figure), but when the AC switch is used, only the switching action can be performed, and the switch cannot adjust the pulse width of the square wave signal output by the photocoupler. Change, thus achieving the brightness and darkness of the LED light.

Referring to FIG. 5, the circuit (see FIG. 3) for implementing the sensing operation mode 402 of the present invention is shown in the present embodiment. The components in the embodiment that are the same as those in the embodiment of FIG. 5 are denoted by the same reference numerals, and their functions are also the same. This will not repeat its function, only the difference between the two.

In the present case, the sensing circuit 70 can include the following two types of sensors: a moving object sensing circuit 72 for sensing whether an external object passes, and transmitting the sensed signal to the microprocessor 40 to cause the microprocessor 40 to The switch circuits 52, 62 are controlled to turn the LED light groups 51, 61 on or off. The mobile object sensing circuit 72 includes a radio wave sensor 722 for sensing whether the transmitted radio wave is blocked, and transmitting the induced signal to the signal amplifier 721 of the subsequent stage to amplify and send the signal. The microprocessor 40.

The radio wave sensor 722 is mainly an infrared sensor or an RF wave sensor.

A photosensor 71 can be used to sense the intensity of the outside light. Different light intensities cause the photosensor 71 to generate different drive currents and send the drive current to the microprocessor 40.

After receiving the driving current from the photosensor 71, the microprocessor 40 determines the magnitude of the driving current to determine the brightness of the LEDs 51, 61, and thereby drives the first and second switches 52, The circuit 62 causes the first and second LED light groups to emit a desired luminance of illumination.

Therefore, when in the sensing mode of operation 402, the system of the present invention first determines whether a person or moving object enters the lighting space by the moving object sensing circuit 72. The processor 40 turns on the light source when a person or moving object enters the lighting space. The brightness of the illumination space is then determined by the photosensor 71 and transmitted to the processor 40.

The second signal input end 43 of the microprocessor is connected to the light sensitive detector 71. The third signal input terminal 42 is coupled to the moving object sensing circuit 72, specifically to the signal amplifier 721 in the moving object sensing circuit 72. The light sensor 71 outputs a square wave signal to the second signal input terminal 43 by sensing the ambient light intensity, and the moving object sensing circuit 72 outputs a square wave to the third signal input terminal 42 after sensing the wireless signal emitted by the external object. signal.

Through the LED induction lighting control circuit, the LED light can be controlled by the sensing circuit to sense the ambient light intensity and the wireless signal of the external object. The specific implementation process includes the following steps: A. The power driving circuit turns on the LED driving power source to start working. The microprocessor 40, the first LED lamp group 51 and the second LED lamp group 61 output a constant voltage constant current signal; B. The optical coupling circuit 20 outputs a square wave signal to the control signal input end of the microprocessor 40, and The microprocessor 40 outputs a pulse width modulation signal to the first switch circuit 52, drives the first switch circuit 52 to be turned on, and controls the first LED lamp group 51 to emit cold white light; C, interrupts the alternating current through the AC switch, so that The square wave signal of the control signal input end of the microprocessor is at a high level, and outputs a pulse width modulation signal to the second switch circuit to drive the second switch circuit to be turned on to control the warming light of the second LED lamp group; And interrupt the AC power again through the AC switch to control the microprocessor. The square wave signal of the signal input end is at a high level, and at the same time, outputting half of the pulse width modulation signals to the first switch circuit and the second switch circuit, driving the first switch circuit and the second switch circuit to be turned on, and controlling the first The LED light group and the second LED light group simultaneously emit light to generate warm white light.

The step B further includes: B1, when the moving object sensing circuit senses a wireless signal sent by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor to cause the microprocessor to the first LED light. The group outputs a pulse width modulation signal to control the illumination of the first LED group.

The step C further includes: C1, when the moving object sensing circuit senses a wireless signal emitted by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor to output the microprocessor to the second LED light group. A pulse width modulation signal controls the illumination of the second LED light group.

The step D further includes: D1, when the moving object sensing circuit senses a wireless signal emitted by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor, so that the microprocessor simultaneously goes to the first switching circuit. And the second switching circuit outputs a half of the pulse width modulation signal, driving the first switching circuit and the second switching circuit to be turned on, and controlling the first LED lamp group and the second LED lamp group to simultaneously emit light.

The method for controlling LED illumination, wherein the step B further comprises: B2, when the photo-sensing sensor senses that the ambient light intensity is lower than a predetermined value, the microprocessor determines that the current time is night, and to the first The switch circuit outputs a pulse width modulation signal, drives the first switch circuit to be turned on, and controls the first LED lamp group to emit light; the step C further includes: C2, when the light sensitive sensor senses that the ambient light intensity is lower than a predetermined value The microprocessor determines that the current time is night, and outputs a pulse width modulation signal to the second switch circuit, driving the second switch circuit to be turned on, and controlling the second LED lamp group to emit light.

The step D further includes: D2. When the light sensitive sensor senses that the ambient light intensity is lower than a predetermined value, the microprocessor determines that the current time is night, and simultaneously outputs the respective to the first switch circuit and the second switch circuit. Half of the pulse width modulation signal drives the first switching circuit and the second switching circuit to be turned on, and controls the first LED lamp group and the second LED lamp group to simultaneously emit light.

The method for controlling LED illumination, wherein the step D further comprises: E, again interrupting the alternating current so that the square wave signal of the control signal input end of the microprocessor is at a high level and outputting a pulse width to the first switch circuit. Modulating a signal, driving the first switch circuit to be turned on, and controlling the first LED lamp group to emit cold white Light; and when the moving object sensing circuit senses a wireless signal emitted by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor, so that the microprocessor outputs a pulse width modulated signal to the first LED light group. Controlling the first LED light group to emit light.

The method for controlling LED illumination, wherein when the photo-sensing sensor senses that the ambient light intensity is lower than a predetermined value, the microprocessor determines that the current time is night, and outputs a pulse width modulation signal to the first switch circuit, The first switch circuit is driven to be turned on, and the first LED lamp group is controlled to emit light.

In this way, by continuously controlling the AC switch to disconnect the AC power, not only the LED light group emits light of different color temperatures, but also realizes the wireless signal of the ambient light intensity and the external object when the LED light group emits light of different color temperatures. To control the illumination of the LED light group, the automatic control of the LED light group illumination is realized, and the purpose of energy saving and environmental protection is achieved. And the enhanced LED lighting function, LED lighting is more intelligent, which is conducive to the application and promotion of LED lighting products.

The LED circuit of the invention can be widely applied to bulb lamps, downlights, ceiling lamps, fluorescent tubes, panel lamps, ceiling lamps, PAR lamps, corn lamps, oil lamps, mining lamps, etc., and the appearance can be met with the requirements of the lamps. Feel free to change, and according to the power required by LED lighting, the drive power can be adjusted to meet the power requirements of various lamps. A wide range of applications.

It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art may modify or change according to the above description. All such improvements and modifications are intended to be included within the scope of the appended claims.

10‧‧‧Drive power supply

20‧‧‧ Waveform Generator

30‧‧‧Power drive circuit

40‧‧‧Microprocessor

51‧‧‧First LED light group

52‧‧‧First switch circuit

61‧‧‧Second LED light group

62‧‧‧Second switch circuit

Claims (13)

An LED lighting control circuit capable of changing a plurality of color temperatures through an AC switch, comprising a driving power source; the driving power source is an AC driving power source; a waveform generator is connected to the driving power source, and a signal of the driving power source is used to generate a driving waveform required; The power driving circuit is connected to the driving power source, converts the power from the driving power source into an analog signal and performs a voltage stabilizing operation to provide other circuit components as a driving power source; and a first LED light group receives power from the power driving circuit. Actuating the power of the first LED light group; a second LED light group receives power from the power supply driving circuit as power for driving the second LED light group; wherein the color temperature of the second LED light group is different from the first a color temperature of an LED lamp group; a microprocessor receives power from the power source driving circuit as its own driving power, and the microprocessor receives a driving signal from the waveform generator; a first switching circuit is connected to the LED lamp group Used to turn the LED light group on or off to make it emit light or stop emitting light; the first switch circuit is connected to the microprocessor to receive From the output signal of the microprocessor, it is possible to turn on or off the first LED lamp set, and the first switch circuit may control flow through the first a current of the LED light group controls the brightness of the first LED light group; and a second switch circuit is connected to the second LED light group for turning the second LED light group on or off to cause it to emit light or stop emitting light; A switching circuit is coupled to the microprocessor to receive an output signal from the microprocessor, such that the second LED group can be turned on or off, and the second switching circuit can also control current flowing through the second LED group Controlling the brightness of the second LED light group; wherein the color temperature of the LED light string in the first LED light group is different from the color temperature of the LED light string in the second LED light group. The LED lighting control circuit capable of changing a plurality of color temperatures by an AC switch according to Item 1 of the patent application, wherein the first and second LED light groups are set to receive only the manual operation of the user to determine whether the LED light group emits light or not. The state of the drive signal enters the microprocessor via the waveform generator, and then the microprocessor controls the switch circuit to turn the first and second LED groups on or off. For example, in the first aspect of the patent application, an LED lighting control circuit capable of changing a plurality of color temperatures through an AC switch, wherein the driving power source is an AC input terminal; the first switching circuit is a field effect transistor; the second switching circuit is a field effect a transistor; the waveform generator is an optical coupler. For example, in the third aspect of the patent application, an LED lighting control circuit capable of changing a plurality of color temperatures by an AC switch, wherein the power driving circuit includes one of an AC to DC circuit and a voltage stabilizing circuit, and an input terminal of the stabilization circuit and the AC conversion An output end of the DC circuit is connected, and the voltage stabilizing circuit is a low voltage difference linear voltage stabilizing integrated circuit. An LED lighting control circuit capable of variable color temperature through an AC switch according to item 4 of the patent application, wherein an output end of the optical coupling circuit is connected to a signal input end of the microprocessor, and a pulse width modulation of the microprocessor The signal output ends are respectively connected to the control ends of the first switch circuit and the second switch circuit for controlling the on and off of the first switch circuit and the second switch circuit. For example, in the first aspect of the patent application, the LED lighting control circuit of the plurality of color temperatures can be changed by the AC switch, wherein the first LED lamp group and the second LED lamp group respectively comprise the same number of LED light strings connected in series with each other. For example, in the first aspect of the patent application, an LED lighting control circuit capable of changing a plurality of color temperatures by an AC switch, wherein the dimmer is connected to the driving power source, and the waveform generator is connected between the driving power source and the power driving circuit. . For example, in the seventh aspect of the patent application, an LED lighting control circuit capable of changing a plurality of color temperatures by an AC switch, wherein the LED inductive illumination control circuit is used to implement a tone-modulated light, comprising the steps of: the power supply driving circuit is connected to an external alternating current The microprocessor, the first LED lamp group and the second LED lamp group output a constant voltage constant current signal; the optical coupling circuit outputs a square wave signal to the control signal input end of the microprocessor, and The first switching circuit outputs a pulse width modulation signal, drives the first switching circuit to be turned on, and controls the first LED lamp group to be cooled White light; adjust the button size of the dimmer to change the pulse width of the square wave signal output by the optocoupler, thereby achieving the brightness and darkness of the LED light; when the LED is cold white, interrupt the alternating current through the dimmer switch, so that the micro processing The square wave signal of the control signal input end of the device is at a low level, and outputs a pulse width modulation signal to the second switch circuit, driving the second switch circuit to be turned on, controlling the second LED lamp group to emit warm light, and adjusting the dimmer The size of the button causes the pulse width of the square wave signal output by the optocoupler to change, thereby realizing the brightness and darkness of the LED illumination; when the LED is warming up, the AC power is interrupted by the dimmer switch to make the control signal input end of the microprocessor The square wave signal is at a low level, and at the same time, outputting half of the pulse width modulation signals to the first switching circuit and the second switching circuit, driving the first switching circuit and the second switching circuit to be turned on, controlling the first LED lamp group and The second LED lamp group emits light at the same time to generate warm white light; adjusting the button size of the dimmer causes the pulse width of the square wave signal output by the photocoupler to change, thereby realizing brightening of the LED light When the LED warms white light, the alternating current is interrupted by the dimmer switch, so that the square wave signal of the control signal input end of the microprocessor is at a low level, and a pulse width modulation signal is output to the first switch circuit to drive the first The switch circuit is turned on, and the first LED lamp group is controlled to emit cold white light, and returns to the initial mode, and a loop ends. For example, the first part of the patent application scope can change multiple color temperatures through the AC switch. The LED lighting control circuit further includes: an AC open relationship connected to the driving power source, and a waveform generator connected between the driving power source and the power driving circuit. For example, in the ninth application of the patent scope, the LED lighting control circuit capable of changing a plurality of color temperatures by the AC switch, wherein the LED inductive illumination control circuit is used to implement the method of adjusting the tone light comprises the steps of: the power supply driving circuit is connected to the external alternating current The microprocessor, the first LED lamp group and the second LED lamp group output a constant voltage constant current signal; the optical coupling circuit outputs a square wave signal to the control signal input end of the microprocessor, and The first switching circuit outputs a pulse width modulation signal, drives the first switching circuit to be turned on, and controls the first LED lamp group to emit cold white light; when the LED emits cold white light, the alternating current switch interrupts the alternating current to control the microprocessor. The square wave signal at the signal input end is at a low level, and outputs a pulse width modulation signal to the second switch circuit, driving the second switch circuit to be turned on, and controlling the second LED light group to emit warm light; when the LED is warming light, Interrupting the alternating current through the alternating current switch, so that the square wave signal of the control signal input end of the microprocessor is at a low level, and outputting one to the first switching circuit and the second switching circuit a half pulse width modulation signal, driving the first switch circuit and the second switch circuit to be turned on, controlling the first LED light group and the second LED light group to simultaneously emit light to generate warm white light; When the LED warms white light, the AC power is interrupted by the AC switch, so that the square wave signal of the control signal input end of the microprocessor is at a low level, and a pulse width modulation signal is output to the first switch circuit, and the first switch circuit is driven to be turned on. Controlling the first LED light group to emit cold white light, returning to the initial mode, and ending a loop. For example, in the first application of the patent scope, the LED lighting control circuit of the variable color temperature through the AC switch further includes a sensing circuit connected to the microprocessor, the sensing circuit can sense the change of the external environment, and transmit the sensing signal to the micro a processor for causing the microprocessor to control the switching circuit to turn the first and second LED lamp groups on or off; and a dimmer or an AC switch connected to the driving power source, the waveform generator connecting the driving power source and the Between the power driving circuits; the sensing circuit comprises the following two types of sensors: a moving object sensing circuit for sensing whether an external object passes, and transmitting the sensed signal to the microprocessor for the microprocessor to control The switch circuit turns on or off the LED light group; wherein the moving object sensing circuit includes a radio wave sensor for sensing whether the transmitted radio wave is blocked, and transmitting the sensed signal to the signal of the subsequent stage An amplifier to amplify the signal and send it to the microprocessor; a photosensor can be used to sense the intensity of the outside light, and different light intensities The photosensitive sensor is caused to generate the same driving current as the dimmer or the alternating current switch, and the driving current is sent to the microprocessor. For example, in the eleventh item of the patent application, an LED lighting control circuit capable of changing a plurality of color temperatures by an AC switch, wherein the LED inductive illumination control circuit is used to implement the method of adjusting the tone light, comprising the steps of: A, the power drive circuit turns on the LED driver. The power source starts to work, and outputs a constant voltage constant current signal to the microprocessor, the first LED lamp group and the second LED lamp group; B. The optical coupling circuit outputs a square wave signal to the control signal input end of the microprocessor, And outputting a pulse width modulation signal to the first switch circuit via the microprocessor, driving the first switch circuit to be turned on, and controlling the first LED lamp group to emit cold white light; C, interrupting the alternating current through the dimmer or the AC switch a square wave signal of the control signal input end of the microprocessor is at a high level, and outputs a pulse width modulation signal to the second switch circuit to drive the second switch circuit to be turned on to control the second LED lamp group to emit warm light. ; D, interrupt the alternating current again through the dimmer or the AC switch, so that the square wave signal of the control signal input end of the microprocessor is at a high level, and simultaneously to the first switch circuit and the second switch Output of each half of the pulse width modulated signal to drive the first switching circuit and the second switch circuit is turned on, the control of the first LED lamp set and a second LED lamp set to emit light simultaneously, to produce warm white light. For example, in the 12th item of the patent application, the LED lighting control circuit of the variable color temperature can be changed by the AC switch, wherein the step B further comprises the steps of: B1, when the moving object sensing circuit senses the wireless signal sent by the external object. The moving object sensing circuit outputs a high level signal to the microprocessor, so that the microprocessor outputs a pulse width modulation signal to the first LED light group to control the first LED light group to emit light; the step C further includes the step When: C1, when the moving object sensing circuit senses a wireless signal emitted by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor, so that the microprocessor outputs a pulse width modulated signal to the second LED light group. Controlling the second LED light group to emit light; the step D further comprises the steps of: D1, when the moving object sensing circuit senses a wireless signal emitted by an external object, the moving object sensing circuit outputs a high level signal to the microprocessor. And causing the microprocessor to simultaneously output half of the pulse width modulation signals to the first switching circuit and the second switching circuit, driving the first switching circuit and the second switching circuit to be turned on, and controlling the first LED group and the second LED The light group simultaneously emits light; the step B further includes the step of: B2, when the light sensitive sensor senses that the ambient light intensity is lower than a predetermined value, the microprocessor determines the current time At night, and outputting a pulse width modulation signal to the first switch circuit, driving the first switch circuit to be turned on, and controlling the first LED light group to emit light; the step C further comprises the steps of: C2, when the light sensitive sensor senses Ambient light intensity below a predetermined value When the microprocessor determines that the current time is night, and outputs a pulse width modulation signal to the second switch circuit, driving the second switch circuit to be turned on, and controlling the second LED light group to emit light; the step D further includes the step of : D2, when the light sensitive sensor senses that the ambient light intensity is lower than a predetermined value, the microprocessor determines that the current time is night, and simultaneously outputs half of the pulse width modulation to the first switch circuit and the second switch circuit. a signal driving the first switch circuit and the second switch circuit to be turned on, controlling the first LED light group and the second LED light group to simultaneously emit light; the step D further comprises the steps of: E, again interrupting the alternating current to make the micro processing The square wave signal of the control signal input end of the device is at a high level and outputs a pulse width modulation signal to the first switch circuit, driving the first switch circuit to be turned on, controlling the first LED lamp group to emit cold white light; and when the moving object senses When the circuit senses a wireless signal from an external object, the moving object sensing circuit outputs a high level signal to the microprocessor to output the microprocessor to the first LED light group. Width modulated signal to control the first light emitting LED lamp set.