CN113973413A

CN113973413A - Dimming and color mixing circuit and lamp

Info

Publication number: CN113973413A
Application number: CN202010710770.0A
Authority: CN
Inventors: 刘伟; 林起锵; 吴永强; 叶和木; 陈毅滨
Original assignee: Leedarson Lighting Co Ltd
Current assignee: Leedarson Lighting Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2022-01-25
Also published as: JP7187110B2; JP2022022094A

Abstract

A light and color adjusting circuit and a lamp comprise a silicon controlled rectifier light modulator, a rectifying circuit, a color adjusting circuit and a constant current circuit. The silicon controlled rectifier dimmer regulates the voltage of the alternating current signal to realize linear dimming, and the rectifying circuit rectifies the regulated alternating current signal into a direct current signal to supply power to each path of light-emitting module. The color matching circuit adjusts the current ratio flowing through each path of light-emitting module, and the constant current circuit performs constant current control on the power supply loop of each path of light-emitting module. Above-mentioned mixing of colors circuit and lamps and lanterns of adjusting luminance controls two at least ways light-emitting module through single circuit to realize adjusting luminance simultaneously and mixing of colors two functions, compatible silicon controlled rectifier adopts the constant current circuit control power supply circuit in the electric current invariable, the work efficiency of circuit is high, circuit structure has been simplified, but wide application in DOB product.

Description

Dimming and color mixing circuit and lamp

Technical Field

The application belongs to the technical field of luminous module control, especially relates to a dimming and color mixing circuit and a lamp.

Background

The silicon controlled light modulation technology is characterized in that a silicon controlled light modulator is connected in series between commercial power and a light driving power supply, and the commercial power is subjected to phase cutting processing by the silicon controlled light modulator and then is output to the light driving power supply, so that a light emitting module is driven to work. However, when the conventional dimming circuit adopts the silicon controlled rectifier for dimming, an additional independent color matching circuit is required to realize the dimming and color matching functions. Therefore, the traditional silicon controlled rectifier dimming technology cannot adjust colors while adjusting the light, so that the working efficiency of the circuit is low and the circuit structure is complex. In addition, the silicon controlled rectifier dimming technology is easy to generate stroboflash due to low compatibility, and in order to eliminate the stroboflash, an additional electrolytic capacitor is usually adopted, so that the electrolytic capacitor is connected in parallel to the input end of the light driving power supply, and the stroboflash is eliminated.

Therefore, the traditional silicon controlled rectifier dimming technology cannot adjust colors while adjusting the light, and the problems of low working efficiency and complex circuit structure of the circuit are caused.

Disclosure of Invention

An object of this application is to provide a mixing of colors circuit and lamps and lanterns adjust luminance, aim at solving traditional silicon controlled rectifier and adjust luminance the unable mixing of colors when adjusting luminance, lead to the problem that the work efficiency of circuit is low, circuit structure is complicated.

The first aspect of the embodiment of the present application provides a dimming and color mixing circuit for controlling at least two paths of light emitting modules to emit light, the dimming and color mixing circuit includes:

the silicon controlled rectifier dimmer is used for accessing an alternating current signal and carrying out voltage regulation processing on the alternating current signal;

the rectifying circuit is connected with the silicon controlled rectifier dimmer and is used for rectifying the alternating current signals subjected to voltage regulation and outputting direct current signals so as to supply power to each path of light-emitting module;

the color matching circuit is connected with each path of light-emitting module and is used for accessing a light-adjusting instruction and correspondingly adjusting the current ratio flowing through each path of light-emitting module according to the light-adjusting instruction; and

and the constant current circuit is connected with the rectifying circuit, the color mixing circuit and each path of light-emitting module and is used for performing constant current control on the power supply loop of each path of light-emitting module.

Further, the color adjusting circuit includes:

the control circuit is used for accessing the dimming instruction and correspondingly outputting at least two color-mixed signals according to the dimming instruction;

the isolation circuit is connected with the control circuit and used for carrying out photoelectric isolation and transmitting the color mixing signal; and

and the current regulating circuits are used for receiving the corresponding color mixing signals and regulating the current of the corresponding light emitting module according to the received color mixing signals.

The color mixing circuit realizes electrical isolation between the control circuit and the current regulating circuit through the isolating circuit, has high transmission efficiency, has strong integral anti-interference capability and prolongs the service life of the control circuit.

Further, the constant current circuit includes:

at least two chip selection circuits, wherein one chip selection circuit is connected with at least one current regulation circuit, the other chip selection circuit is connected with the light-emitting module, and each chip selection circuit is used for switching a power supply loop of each path of light-emitting module; and

and the constant current control circuit is connected with the rectifying circuit and each chip selection circuit and is used for performing constant current control on each power supply loop of the light emitting module.

According to the constant current circuit, the working state of the chip selection circuit is changed to switch the power supply loops of all the light emitting modules, so that the dimming and color mixing of a single circuit can be realized, and the power factor is ensured to be high by performing constant current control on the power supply loops of all the light emitting modules.

Further, the isolation circuit includes:

at least two optical couplers;

the light emitter of each optical coupler is connected with the control circuit, and the light receiver of each optical coupler is correspondingly connected with one current regulating circuit.

In the isolating circuit, the optical coupler performs electric-optical-electric conversion on the received color modulation signal and outputs the converted color modulation signal to the correspondingly connected current regulating circuit, so that electric isolation is realized, and the overall safety of the circuit is improved.

Further, the dimming and toning circuit further comprises:

and the control assembly is connected with the control circuit and used for outputting the corresponding dimming instruction to the control circuit according to an operation instruction of a user.

The control assembly has the advantages of multi-gear selection, color temperature selection for a user, simplicity and convenience in operation and high user experience.

Further, the current regulating circuit includes:

the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch tube, a second switch tube and a first diode;

the first end of the first resistor is connected with one path of the light-emitting module, the common-connected node of the second end of the first resistor, the first end of the second resistor and the controlled end of the first switch tube is connected with the isolating circuit, the common-connected node of the input end of the first switch tube and the cathode of the first diode is connected with one path of the light-emitting module, and the common-connected node of the anode of the first diode, the first end of the third resistor, the first end of the fourth resistor and the controlled end of the second switch tube is connected with the anode of the first diode, the first end of the third resistor, the first end of the fourth resistor and the controlled end of the second switch tube; the second end of the third resistor and the input end of the second switch tube are both connected with one path of the light-emitting module;

and the nodes of the second end of the second resistor, the second end of the fourth resistor, the output end of the first switching tube and the output end of the second switching tube are connected in common are connected with the constant current circuit.

The current regulating circuit is composed of simple electronic elements and is controlled by the dimming signal, when the characteristic parameter of the dimming signal changes, the conduction state of the first switch tube and the second switch tube correspondingly changes, and therefore the purpose of controlling the current flowing through the corresponding light-emitting module is achieved, and the circuit is low in cost due to the fact that the conventional electronic elements are adopted.

Further, the chip selection circuit includes:

the circuit comprises an enabling chip, a fifth resistor, a sixth resistor, a seventh resistor, a second diode and a third diode;

a first end of the fifth resistor is connected with at least one current regulating circuit, a second end of the fifth resistor is connected with an anode of the second diode in common, and a cathode of the second diode is connected with a transmission end of the enable chip or a chip selection end of the enable chip; the chip selection end of the enable chip, the first end of the sixth resistor, the first end of the seventh resistor and the anode of the third diode are connected in common, and the second end of the sixth resistor, the second end of the seventh resistor and the cathode of the third diode are connected in common.

The chip selection circuit achieves the purpose of changing the power supply loop of the light-emitting module by changing the working state of the enabling chip.

Further, the constant current control circuit includes:

the constant current control circuit comprises a first constant current control chip, a second constant current control chip, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor and a second capacitor;

the current limiting end of the first constant current control chip, the first end of the eighth resistor and the first end of the ninth resistor are connected in common; the first current limiting end of the second constant current control chip is connected with the first end of the tenth resistor in common, and the second current limiting end of the second constant current control chip, the second end of the tenth resistor, the first end of the eleventh resistor and the first end of the twelfth resistor are connected in common; a node where the transmission end of the first constant current control chip, the first transmission end of the second constant current control chip and the first end of the first capacitor are connected in common is connected with one chip selection circuit; a second transmission end of the second constant current control chip is connected with a first end of the thirteenth resistor in common, a node where a second end of the thirteenth resistor is connected with a first end of the fourteenth resistor in common is connected with the rectifying circuit, a second end of the fourteenth resistor, a first end of the fifteenth resistor and a first end of the sixteenth resistor are connected in common, and a second end of the fifteenth resistor, a first end of the second capacitor and a power supply end of the first constant current control chip are connected in common;

a second end of the eighth resistor, a second end of the ninth resistor, a second end of the eleventh resistor, a second end of the twelfth resistor, a second end of the sixteenth resistor, a second end of the first capacitor, and a second end of the second capacitor are grounded.

Constant current power supply is realized through the constant current control circuit.

Further, the method also comprises the following steps:

the at least two ripple removing circuits are connected with the light emitting modules respectively, one of the ripple removing circuits is further connected with the rectifying circuit, the other ripple removing circuit is further connected with at least one chip selection circuit, and the ripple removing circuits are used for performing ripple removing treatment on current flowing through the light emitting modules respectively.

Through increasing and removing ripple circuit, realize need not to increase electrolytic capacitor and can eliminate the stroboscopic, avoid electrolytic capacitor to reduce power factor to realize adjusting luminance mixing of colors circuit compatible silicon controlled rectifier, improve power factor and eliminate stroboscopic purpose.

A second aspect of an embodiment of the present application provides a luminaire, including:

at least two light emitting modules; and

in the dimming and toning circuit, the dimming and toning circuit is used for controlling the light-emitting module to emit light.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: above-mentioned mixing of colors circuit and lamps and lanterns of adjusting luminance controls two at least ways light-emitting module through single circuit to realize adjusting luminance simultaneously and mixing of colors two functions, compatible silicon controlled rectifier adopts the constant current circuit control power supply circuit in the electric current invariable, the work efficiency of circuit is high, circuit structure has been simplified, but wide application in DOB product.

Drawings

Fig. 1 is a schematic block diagram of a dimming and toning circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a specific structure of the dimming and toning circuit shown in fig. 1;

FIG. 3 is a schematic circuit diagram of an exemplary dimming and toning circuit shown in FIG. 2;

fig. 4 is a schematic circuit diagram of an example of a dimming and toning circuit according to another embodiment of the present disclosure;

fig. 5 is a schematic diagram of input voltages corresponding to different operating states of the dimming and toning circuit shown in fig. 3 or 4.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1, a schematic diagram of a module structure of a dimming and toning circuit according to an embodiment of the present application is shown, for convenience of description, only the parts related to the embodiment are shown, and the detailed description is as follows:

a dimming and color-mixing circuit is used for controlling at least two light-emitting modules 100 to emit light, specifically, the light-emitting colors of at least two light-emitting modules 100 in each light-emitting module 100 are different, for example, one light-emitting module 100 emits green light, and the other light-emitting module 100 emits blue light.

The dimming and color-mixing circuit comprises a silicon controlled dimmer 10, a rectifying circuit 20, a color-mixing circuit 30 and a constant current circuit 40.

The silicon controlled dimmer 10 is connected to the rectifying circuit 20, the color modulation circuit 30 is connected to each light emitting module 100, and the constant current circuit 40 is connected to the rectifying circuit 20, the color modulation circuit 30, and each light emitting module 100.

And the silicon controlled dimmer 10 is used for accessing the alternating current signal and regulating the voltage of the alternating current signal.

Specifically, the scr dimmer 10 generates a tangential output voltage waveform by passing the voltage waveform of the input ac signal through a conduction angle chopper; by applying the tangential principle, the effective value of the output voltage can be reduced, so that the power of the load is reduced, the adjustment precision is high, the linear dimming can be realized, and the efficiency is high.

The rectifying circuit 20 rectifies the AC signal after voltage regulation and outputs a DC signal; the dc signal is used as a power supply signal to supply power to each of the light emitting modules 100, and flows into the power supply loop of each of the light emitting modules 100, so as to provide current regulation for the color modulation circuit 30 and provide constant current control for the constant current circuit 40.

Specifically, the rectifier circuit 20 is implemented by using a rectifier bridge BD 1.

The color matching circuit 30 is connected to each of the light emitting modules 100, and is configured to correspondingly adjust a current ratio flowing through each of the light emitting modules 100 according to the received color matching signal.

Specifically, the color matching circuit 30 respectively adjusts the current flowing through each path of the light emitting module 100 one by one, so that the current ratio of each path of the light emitting module 100 reaches a target value, and adjusts the light emitting ratio of each path of the light emitting module 100 by adjusting the current flowing through each path of the light emitting module 100, thereby finally realizing color temperature adjustment.

And the constant current circuit 40 is connected with the rectifying circuit 20, the color modulation circuit 30 and each path of light emitting module 100, and is used for performing constant current control on a power supply loop of each path of light emitting module 100.

Specifically, the constant current circuit 40 also has a bleeding function, which is turned on when the voltage in the circuit is at the valley, so as to maintain the current.

Fig. 2 is a schematic diagram of a specific structure of the dimming and toning circuit shown in fig. 1, which only shows the parts related to the present embodiment for convenience of description, and the details are as follows:

in an alternative embodiment, the color tuning circuit 30 includes a control circuit 31, an isolation circuit 32, and at least two current adjusting circuits 33.

The control circuit 31 is connected to the isolation circuit 32, and the current regulation circuit 33 is connected to the constant current circuit 40 and the isolation circuit 32.

And the control circuit 31 is used for accessing the dimming instruction and correspondingly outputting at least two color modulation signals according to the dimming instruction.

Specifically, the color Modulation signal is a Pulse Width Modulation (PWM) signal, and the control circuit 31 generates a PWM signal having a certain Width according to the dimming command and outputs the PWM signal to the isolation circuit 32.

And the isolation circuit 32 is connected with the control circuit 31 and used for carrying out photoelectric isolation and transmitting the toning signals.

The electric isolation between the control circuit 31 and the current regulating circuit is realized through the isolating circuit 32, and the transmission efficiency is high, so that the overall anti-interference capability of the circuit is strong, and the service life of the control circuit 31 is prolonged.

And at least two current adjusting circuits 33, connected to the constant current circuit 40 and the isolation circuit 32, and respectively connected to the light emitting modules 100 in a one-to-one correspondence manner, for receiving the color modulation signals in a one-to-one correspondence manner, and correspondingly adjusting the current flowing through the corresponding light emitting module 100 according to the received color modulation signals.

Specifically, fig. 2 only shows a dimming and toning circuit having two current adjusting circuits (current adjusting circuit 1 and current adjusting circuit 2), the dimming and toning circuit drives two light emitting modules (light emitting module 1 and light emitting module 2) to emit light, and the light emitting colors of the two light emitting modules are different.

In an alternative embodiment, the constant current circuit 40 includes a constant current control circuit 42 and at least two chip selection circuits.

One chip selection circuit is connected with at least one current regulation circuit, the other chip selection circuit is connected with the light-emitting module, and the constant current control circuit 42 is connected with the rectifying circuit 20 and each chip selection circuit 41.

And at least two chip selection circuits 41, wherein one chip selection circuit is connected with at least one current regulation circuit, the other chip selection circuit is connected with the light-emitting module, and each chip selection circuit switches the power supply loop of each path of light-emitting module.

Specifically, the chip selection circuit 41 switches the power supply circuit of each light emitting module by changing the working state thereof, so that a single circuit can perform dimming and color modulation. The operating state of the chip select circuit 41 can be set by a write program.

The constant current control circuit 42 performs constant current control on the power supply loops of the light emitting modules 100.

Specifically, the constant current control circuit 42 also has a bleeding function, and when the voltage in the circuit is at the valley, the bleeding function is turned on to maintain the current.

Specifically, fig. 2 only shows the constant current circuit 40 having two chip selection circuits, and the corresponding dimming and color-adjusting circuit controls two paths of light emitting modules (the light emitting module 1 and the light emitting module 2), and each light emitting module correspondingly has two power supply loops according to the working state of the chip selection circuit.

The supply circuit is described below with reference to fig. 2:

for the light emitting module 1, the first power supply loop is: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 1 and a constant current control circuit 42; the second power supply loop is as follows: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42.

For the light emitting module 2, the first power supply loop is: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42; the second power supply loop is as follows: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42.

According to the above analysis, the second power supply circuit of the light emitting module 1 is the same as the second power supply circuit of the light emitting module 2, that is, the light emitting module 1 and the light emitting module 2 emit light in series at this time.

The first power supply loop of the light emitting module 1 and the first power supply loop of the light emitting module 2 exist at the same time, and the second power supply loop of the light emitting module 1 and the second power supply loop of the light emitting module 2 exist at the same time. That is, there are two combinations of the working states of the chip selection circuit 1 and the chip selection circuit 2, wherein one combination of the working states makes the light emitting module 1 have the first power supply loop and makes the light emitting module 2 have the first power supply loop; another combination of operating states is to provide the light module 1 with a second supply circuit and to provide the light module 2 with a second supply circuit.

Referring to fig. 3, a schematic diagram of an exemplary circuit of the dimming and toning circuit shown in fig. 2 is shown, for convenience of description, only the portion related to the present embodiment is shown, and the following details are described:

in an alternative embodiment, the isolation circuit 32 includes at least two optocouplers (U11 and U13 in FIG. 3).

The light emitter of each optocoupler is connected to the control circuit 31 to receive the adjustment signal output by the control circuit 31.

The light receiver of each optical coupler is correspondingly connected with a current regulating circuit 33; after the light emitter converts the adjustment signal into an optical signal, the light receiver receives the optical signal and converts the optical signal into an electrical signal, and the electrical signal is output to the corresponding current adjustment circuit 33.

In the isolating circuit 32, the optical coupler performs electrical-to-optical-to-electrical conversion on the received color modulation signal, and then outputs the converted color modulation signal to the correspondingly connected current regulating circuit 33, so that electrical isolation is realized, and the overall safety of the circuit is improved.

In an alternative embodiment, the current regulating circuit 33 includes a first resistor R20, a second resistor R21, a third resistor R23, a fourth resistor R22, a first switch Q3, a second switch Q2, and a first diode D7.

The following description will be made of a circuit connection structure by taking the current adjusting circuit 2 in fig. 3 as an example:

in the current regulating circuit 2, a first end of the first resistor R20 is connected to a light emitting module, a node where a second end of the first resistor R20, a first end of the second resistor R21, and a controlled end of the first switch tube Q3 are connected in common is connected to the isolating circuit 32, and a node where an input end of the first switch tube Q3 and a cathode of the first diode D7 are connected in common is connected to a light emitting module.

The anode of the first diode D7, the first end of the third resistor R23, the first end of the fourth resistor R22 and the controlled end of the second switch tube Q2 are connected in common; the second end of the third resistor R23 and the input end of the second switch tube Q2 are both connected to a light emitting module.

The constant current circuit 40 is connected to a node where the second terminal of the second resistor R21, the second terminal of the fourth resistor R22, the output terminal of the first switch transistor Q3 and the output terminal of the second switch transistor Q2 are connected in common.

It should be noted that the type, number and connection relationship of the electronic components in the current regulating circuit 1 are the same as those of the current regulating circuit 2, and for convenience of principle introduction, the reference numbers of the electronic components in the current regulating circuit 1 are set to be different from those of the corresponding electronic components in the current regulating circuit 1; similarly, the chip selection circuit 1 and the chip selection circuit 2 described below have different numbers of corresponding electronic components.

For the current regulating circuit 1, the labels of its electronic components are respectively: the circuit comprises a first resistor R30, a second resistor R29, a third resistor R28, a fourth resistor R27, a first switch tube Q5, a second switch tube Q6 and a first diode D9.

Specifically, the isolation circuit 32 shown in fig. 2 has two optocouplers (U11 and U12), and the adjusting circuit has two current adjusting circuits (current adjusting circuit and current adjusting circuit 2), wherein the output terminal G1A of the light receiver of the optocoupler U11 is connected to the controlled terminal of the first switching tube Q3 of the current adjusting circuit 1, and the controlled terminal G1 of the light emitter is connected to the control circuit 31; the output terminal G2A of the light receiver of the optocoupler U12 is connected to the controlled terminal of the first switch Q3 of the current regulator circuit 2, and the controlled terminal G2 of the light emitter is connected to the control circuit 31.

The first switch tube Q3 and the second switch tube Q2 adjust their working states according to the adjustment signal, and may be turned on, half-on, off or other on states.

The current adjusting circuit 33 is composed of simple electronic components, and is controlled by the dimming signal, and when the characteristic parameter of the dimming signal changes, the conduction state of the first switch tube and the second switch tube changes correspondingly, so that the purpose of controlling the magnitude of the current flowing through the corresponding light emitting module is achieved, and the circuit is low in cost due to the adoption of the conventional electronic components.

In an alternative embodiment, the chip select circuit 41 includes an enable chip, a fifth resistor, a sixth resistor, a seventh resistor, a second diode, and a third diode.

The following description will be made of a circuit connection structure by taking the chip select circuit 1 in fig. 3 as an example:

for the chip selection circuit 1, a first end of the fifth resistor R11 is connected to at least one current regulation circuit, a second end of the fifth resistor R11 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the transmission end of the enable chip U2 or the chip selection end of the enable chip U2; the chip selection end of the enable chip U2, the first end of the sixth resistor R12a, the first end of the seventh resistor R12, and the anode of the third diode D3 are connected in common, and the second end of the sixth resistor R12a, the second end of the seventh resistor R12, and the cathode of the third diode D3 are connected in common.

Specifically, the dimming and toning circuit shown in fig. 2 has two chip selection circuits (a chip selection circuit 1 and a chip selection circuit 2). A first end of a fifth resistor R11 of the chip selection circuit 1 is connected with an output end of a first switch tube Q3 in the current regulation circuit 1, and a cathode of a second diode D2 of the chip selection circuit 1 is connected with a transmission end OUT of an enable chip U2 in the circuit; the first end of the fifth resistor R11 of the chip selection circuit 2 is connected to the output end of the first switch tube Q3 in the current regulation circuit 1, and the transmission end of the enable chip U2 of the chip selection circuit 2 is connected to the rectification circuit 20.

For the chip select circuit 2, the electronic components are respectively numbered as follows: the circuit comprises an enable chip U1, a fifth resistor R14, a sixth resistor R16a, a seventh resistor R16, a second diode D4 and a third diode D6.

The chip selection circuit 1 and the chip selection circuit 2 switch the power supply circuit of each light emitting module 100 by changing their own working states.

The enable chip U2 of the chip selection circuit 1 and the enable chip U1 of the chip selection circuit 2 are simultaneously operated or not operated.

In an optional embodiment, the constant current control circuit 42 includes a first constant current control chip U3, a second constant current control chip U4, an eighth resistor R8, a ninth resistor R9, a tenth resistor R2, an eleventh resistor R3, a twelfth resistor R4, a thirteenth resistor R1, a fourteenth resistor R5, a fifteenth resistor R7, a sixteenth resistor R6, a first capacitor C2, and a second capacitor C1.

The current limiting end REXT of the first constant current control chip U3, the first end of the eighth resistor R8 and the first end of the ninth resistor R9 are connected in common; a first current limiting end Rcs1 of the second constant current control chip U4 is commonly connected with a first end of a tenth resistor R2, and a second current limiting end of the second constant current control chip U4, a second end of the tenth resistor R2, a first end of an eleventh resistor R3 and a first end of a twelfth resistor R4 are commonly connected; a chip selection circuit is connected to a node where the transmission terminal of the first constant current control chip U3, the first transmission terminal OUT1 of the second constant current control chip U4 and the first terminal of the first capacitor C2 are connected in common.

The second transmission terminal OUT2 of the second constant current control chip U4 is connected to the first terminal of the thirteenth resistor R1, the node where the second terminal of the thirteenth resistor R1 is connected to the first terminal of the fourteenth resistor R5 is connected to the rectifying circuit 20, the second terminal of the fourteenth resistor R5, the first terminal of the fifteenth resistor R7 and the first terminal of the sixteenth resistor R6 are connected to each other, and the second terminal of the fifteenth resistor R7, the first terminal of the second capacitor C1 and the power source terminal VT of the first constant current control chip U3 are connected to each other.

A second end of the eighth resistor R8, a second end of the ninth resistor R9, a second end of the eleventh resistor R3, a second end of the twelfth resistor R4, a second end of the sixteenth resistor R6, a second end of the first capacitor C2, and a second end of the second capacitor C1 are grounded.

Specifically, the second constant current control chip U4 is a dual-channel chip, and the input end and the output end of the first channel are respectively the second transmission end OUT2 and the first current limiting end Rcs1, and the input end and the output end of the second channel are respectively the first transmission end OUT1 and the second current limiting end Rcs 2. The second channel of the second constant current control chip U4 has a bleed function that is turned on when the voltage in the circuit is at the valley, thereby maintaining the current.

In an optional embodiment, the control circuit 31 is implemented by using a single chip microcomputer U8, the single chip microcomputer U8 has at least two PWM output terminals, and each PWM output terminal is correspondingly connected to one optical coupler.

The operation principle of the dimming and toning circuit provided in this embodiment is described below with reference to fig. 5 and fig. 3:

fig. 5 is a schematic diagram of input voltages corresponding to different operating states of the dimming and toning circuit shown in fig. 3 or 4; the input voltage is denoted by Vin, which refers to the voltage at the HV point in fig. 3 or fig. 4.

(1) When V1> Vin > V0, a second channel of a second constant current control chip U4 is opened, so that the working current of the whole circuit is larger than the minimum maintaining current of the thyristor inside the thyristor dimmer 10; at this time, the chip selection circuit, the light modulation circuit and the light emitting module are not conducted.

At this time, the circuit loops are: the thyristor regulator is a rectifier bridge BD1, a thirteenth resistor R1, a first transmission end OUT1 of a second constant current control chip U4, a second current limiting end Rcs2 of the second constant current control chip U4, a tenth resistor R2, a twelfth resistor R4 and the ground. Assume that the current in the circuit at this time is I1, I1 > 0.

(2) When V2> Vin > V1, the chip selection circuit, the dimming circuit, and the light emitting module are all turned on, the enable chip U1 in the chip selection circuit 1 is turned on in parallel with the enable chip U2 in the chip selection circuit 2, the second diode D4 in the chip selection circuit 2 is turned off, and the second diode D2 in the chip selection circuit 1 is turned on.

At this time, the power supply loop of the light emitting module 1 is: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 1 and a constant current control circuit 42; the second power supply loop is as follows: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42.

More specifically, the power supply loop of the light emitting module 1 is: the thyristor dimmer 10, the rectifying circuit 20, the light emitting module 1, the first switching tube Q5 and the second switching tube Q6 of the current regulating circuit 1, the fifth resistor R11, the second diode D2, the transmission end OUT of the enable chip U2, the transmission end OUT of the enable chip U2, the chip select end CS of the enable chip U2, the seventh resistor R12, the transmission end OUT of the first constant current control chip U3, the current limiting end REXT, and the eighth resistor R8 are grounded.

At this time, the power supply loop of the light emitting module 2 is: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42.

More specifically, the power supply loop of the light emitting module 2 is: the thyristor dimmer 10, the rectifying circuit 20, the transmission terminal OUT and the chip selection terminal CS of the enable chip U1 in the chip selection circuit 2, the seventh resistor R16, the light emitting module 2, the first switch tube Q3 and the second switch tube Q2 in the current adjusting circuit 2, the seventh resistor R12 in the chip selection circuit 1, the transmission terminal OUT and the current limiting terminal REXT of the first constant current control chip U3, and the eighth resistor R8 are grounded.

At this time, the current in the circuit is I1+ I2, I2 > 0.

(3) When V3> Vin > V2, the chip selection circuit, the dimming circuit, and the light emitting module are all turned on, the enable chip U1 in the chip selection circuit 1 and the enable chip U2 in the chip selection circuit 2 are both turned off, the second diode D4 in the chip selection circuit 2 is turned on, and the second diode D2 in the chip selection circuit 1 is turned off. At this time, the light emitting module 1 and the light emitting module 2 are connected in series, and the power supply loops of the light emitting module 1 and the light emitting module 2 are the same.

The power supply loops of the light-emitting module 1 and the light-emitting module 2 are: the light-emitting diode comprises a silicon controlled dimmer 10, a rectifying circuit 20, a light-emitting module 1, a current regulating circuit 1, a chip selection circuit 2, a light-emitting module 2, a current regulating circuit 2, a chip selection circuit 1 and a constant current control circuit 42.

More specifically, the power supply loops of the light emitting module 1 and the light emitting module 2 are both: the thyristor dimmer 10, the rectifying circuit 20, the lighting module 1, the first switching tube Q5 and the second switching tube Q6 in the current regulating circuit 1, the fifth resistor R14, the second diode D4 and the third diode D6 in the chip selection circuit 2, the lighting module 2, the first switching tube Q3 and the second switching tube Q2 in the current regulating circuit 2, the third diode D3 in the chip selection circuit 1, the first channel of the second constant current control chip U4 in the constant current control circuit 42, the twelfth resistor R4/the transmission end OUT and the current limiting end REXT-ground of the first constant current control chip U3 are connected in series.

At this time, the operating current in the circuit is I1+ I2+ I3, I3 > 0.

Above-mentioned mixing of colors circuit of adjusting luminance controls two at least ways light emitting module through single circuit to realize adjusting luminance simultaneously and mixing of colors two functions, compatible silicon controlled rectifier adopts constant current circuit 40 control power supply circuit in the electric current invariant, the work efficiency height of circuit, circuit structure have obtained the simplification, but wide application in the DOB product.

Referring to fig. 4, an exemplary circuit schematic diagram of a dimming and toning circuit according to another embodiment of the present application is shown, for convenience of description, only the portion related to the embodiment is shown, and the following details are described:

in an optional embodiment, the dimming and color-adjusting circuit further includes at least two ripple removing circuits, each of the ripple removing circuits is connected to each of the light emitting modules, one of the ripple removing circuits is further connected to the rectifying circuit 20, the other ripple removing circuit is further connected to at least one chip selection circuit, and each of the ripple removing circuits is respectively configured to perform ripple removing processing on the current flowing through the light emitting module.

Fig. 4 shows a dimming and toning circuit with two ripple removing circuits (a ripple removing circuit 51 and a ripple removing circuit 52).

Taking the ripple removing circuit 51 as an example, it includes a diode D8, zener diodes ZD3 and ZD5, a resistor, a MOS transistor Q4, and electrolytic capacitors C16 and EC4, and the depth of the ripple removal can be set according to the clamping voltages of the zener diodes ZD3 and ZD 5.

Through increasing and removing ripple circuit, realize need not to increase electrolytic capacitor and can eliminate the stroboscopic, avoid reducing power factor to realize adjusting luminance mixing of colors circuit compatibility silicon controlled rectifier, improve power factor and eliminate stroboscopic purpose.

The mixing of colors circuit of adjusting luminance that this embodiment provided is through two at least road light emitting module of single circuit control to realize adjusting luminance simultaneously and mixing of colors two functions, compatible silicon controlled rectifier adopts the stroboscopic that removes the silicon controlled rectifier and bring to remove ripple circuit, need not to adopt electrolytic capacitor, keeps power factor more than 0.9, and the electricity utilization rate is high.

In an optional embodiment, the dimming and color-adjusting circuit further includes a power supply circuit 60, and the power supply circuit 60 is connected to the rectifying circuit 20 and configured to output a power supply signal to the control circuit 31 to supply power to the single chip microcomputer U8.

In an alternative embodiment, the toning circuit 30 further includes a control component 34.

The control module 34 is connected to the control circuit 31.

The control module 34 outputs a corresponding dimming command to the control circuit 31 according to an operation command of a user.

Specifically, the control assembly 34 is implemented by a touch screen, a key panel, a dial switch or a knob, and generates a dimming instruction by outputting an operation instruction by a user. Fig. 4 shows that the steering assembly 34 is implemented using a dip switch SW 1.

The control assembly 34 has multiple selectable gears, so that the color temperature can be selected by a user, the operation is simple and convenient, and the user experience is high.

A second aspect of the present application provides a luminaire. The lamp comprises at least two light-emitting modules 100 and the light and color adjusting circuit, wherein the light and color adjusting circuit is used for controlling the light-emitting modules 100 to emit light.

To sum up, this application provides a mixing of colors circuit and lamps and lanterns of adjusting luminance through two at least road light emitting module of single circuit control to realize adjusting luminance simultaneously and mixing of colors two functions, compatible silicon controlled rectifier adopts the electric current invariant in the constant current circuit control power supply circuit, and the work efficiency of circuit is high, circuit structure has obtained the simplification, but wide application is on the DOB product.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. The utility model provides a mixing of colors circuit of adjusting luminance for control two at least ways light-emitting module send out light, its characterized in that, the mixing of colors circuit of adjusting luminance includes:

2. The dimming and toning circuit of claim 1, wherein the toning circuit comprises:

the control circuit is used for accessing the dimming instruction and correspondingly outputting at least two color modulation signals according to the dimming instruction;

3. The dimming and toning circuit of claim 2, wherein the constant current circuit comprises:

4. The dimming and toning circuit of claim 2, wherein the isolation circuit comprises:

at least two optical couplers;

5. The dimming and toning circuit of claim 2, further comprising:

6. The dimming and toning circuit of claim 2, wherein the current regulating circuit comprises:

7. The dimming and toning circuit of claim 3, wherein the chip selection circuit comprises:

8. The dimming and toning circuit of claim 3, wherein the constant current control circuit comprises:

9. The dimming and toning circuit of claim 3, further comprising:

10. A light fixture, comprising:

at least two light emitting modules; and

the dimming and toning circuit of any one of claims 1 to 9, which is used for controlling the light-emitting module to emit light.