CN211128294U

CN211128294U - L ED dimming and color adjusting circuit and L ED lamp

Info

Publication number: CN211128294U
Application number: CN201922425748.7U
Authority: CN
Inventors: 张凤
Original assignee: Xiamen Yankon Energetic Lighting Co Ltd; Zhejiang Yankon Group Co Ltd
Current assignee: Xiamen Yankon Energetic Lighting Co Ltd; Zhejiang Yankon Group Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-28
Anticipated expiration: 2029-12-27

Abstract

The utility model relates to an L ED adjusts luminance mixing of colors technical field the utility model discloses a L ED adjusts luminance mixing of colors circuit and L0 ED lamps and lanterns, wherein, L1 ED adjusts luminance mixing of colors circuit and includes first switch circuit, second switch circuit, isolating circuit, electric capacity C1, electric capacity C2, first L ED light source and second L ED light source, the colour temperature of first L ED light source and second L ED light source is different, and reverse parallel arrangement, first end after first L ED light source and second L ED light source connect the positive pole and the negative pole of power respectively through first switch circuit and second switch circuit, the second end after first bipolar L ED light source and second L light source connect the positive pole and the negative pole of power respectively through electric capacity C1 and electric capacity C2, first switch circuit and second switch circuit's control end connects a PWM control signal through isolating circuit, by this PWM control signal drive circuit and second switch circuit in turn on.

Description

L ED dimming and color adjusting circuit and L ED lamp

Technical Field

The utility model belongs to the technical field of L ED adjusts luminance and mix colours, specifically relate to a L ED adjusts luminance mixing of colors circuit and L ED lamps and lanterns.

Background

L ED lamp has been more and more widely used in various places because of its advantages of high efficiency, energy saving, environmental protection, long service life, etc. in many places, such as art gallery, museum, etc., it is often necessary to adjust the light, even adjust the color, to meet the needs of different use scenes.

The traditional L ED dimming and color-mixing circuit is realized by adopting two L ED light sources with different color temperatures, and two PWM signals are adopted to respectively control two groups of L ED light sources with different color temperatures so as to realize dimming and color mixing, for example, the patent disclosed in the specification of CN 103874298A has the defects of high cost, complex program, incapability of isolating the PWM signals from a main loop and easiness in interference, at least three output lines are required for the two L ED light sources, the circuit is complex, the cost is high, the positive and negative electrodes need to be distinguished, and the wiring is very inconvenient.

Disclosure of Invention

An object of the utility model is to provide an L ED adjusts luminance mixing of colors circuit and L ED lamps and lanterns are used for solving the technical problem that above-mentioned exists.

In order to achieve the purpose, the utility model adopts the technical scheme that an L ED dimming and color mixing circuit comprises a first switch circuit, a second switch circuit, an isolating circuit, a capacitor C1, a capacitor C2, a first L ED light source and a second L ED light source, the color temperatures of the first L ED light source and the second L ED light source are different and are arranged in reverse parallel, the first ends of the first L ED light source and the second L ED light source which are connected in parallel are respectively connected with the anode and the cathode of a power supply through the first switch circuit and the second switch circuit, the second ends of the first L ED light source and the second L ED light source which are connected in parallel are respectively connected with the anode and the cathode of the power supply through the capacitor C1 and the capacitor C2, the control ends of the first switch circuit and the second switch circuit are connected with a bipolar PWM control signal through the isolating circuit, and the first switch circuit and the second switch circuit are driven to be alternately conducted through the PWM control signal.

Further, the first switch circuit is realized by adopting an MOS transistor.

Furthermore, the first switch circuit is implemented by using an NMOS transistor Q1, a drain of the NMOS transistor Q1 is connected to an anode of the power supply, a source of the NMOS transistor Q1 is connected to a first end of the first L ED light source and a first end of the second L ED light source, which are connected in parallel, and a gate of the NMOS transistor Q1 is connected to the PWM control signal through an isolation circuit.

Furthermore, the second switch circuit is implemented by using a MOS transistor.

Furthermore, the second switch circuit is implemented by using an NMOS transistor Q2, a drain of the NMOS transistor Q2 is connected to the first end of the first L ED light source and the second L ED light source connected in parallel, a source of the NMOS transistor Q2 is connected to a negative electrode of the power supply, and a gate of the NMOS transistor Q2 is connected to the PWM control signal through an isolation circuit.

Furthermore, the isolation circuit is realized by adopting a magnetic ring T, a main coil of the magnetic ring T is connected with a PWM control signal, a first secondary coil of the magnetic ring T is connected between a grid electrode and a source electrode of the NMOS tube Q1, a second secondary coil of the magnetic ring T is connected between the grid electrode and the source electrode of the NMOS tube Q2, and the homonymous ends of the first secondary coil and the second secondary coil are opposite.

Further, the first L ED light source is composed of a plurality of LEDs connected in series.

Further, the second L ED light source is composed of a plurality of LEDs connected in series.

The utility model also provides an L ED lamps and lanterns are equipped with foretell L ED and adjust luminance mixing of colors circuit.

The utility model has the advantages of:

the utility model adopts a single-path PWM control signal to realize light and color adjustment, and has low cost and simple program; the PWM control signal circuit is isolated from the main loop, so that the anti-interference performance is strong; only two output lines are needed, the circuit is simple, the cost is low, the anode and the cathode do not need to be distinguished, and the wiring is easy; the applicability is wide.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of a first embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a second embodiment of the present invention.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Example one

As shown in fig. 1, an L ED light and color adjusting circuit includes a first switch circuit, a second switch circuit, an isolation circuit, a capacitor C1, a capacitor C2, a first L ED light source L0 ED1 and a second L1 ED light source L2 ED2, wherein color temperatures of the first L3 ED light source L4 ED1 and the second L5 ED light source L6 ED2 are different, such as a color temperature of the first L ED light source L ED1 is 5000K, and a color temperature of the second L ED light source L ED2 is 2700K, but not limited thereto, and in other embodiments, color temperatures of the first L ED light source L ED1 and the second L ED light source L ED2 may be selected according to actual needs.

In this embodiment, the first L ED light source L ED1 and the second L ED light source L ED2 are both formed by connecting a plurality of leds in series, but not limited thereto, and in other embodiments, the first L ED light source L ED1 and the second L ED light source L ED2 may also be formed by connecting a single led or a plurality of leds in series and parallel.

The first L ED light source L ED1 and the second L0 ED light source L1 ED2 are reversely arranged in parallel, that is, the negative electrode of the first L ED light source L ED1 is connected with the positive electrode of the second L ED light source L ED2, and the positive electrode of the first L ED light source L ED1 is connected with the negative electrode of the second L ED light source L ED 2.

The first end OUT + of the first L ED light source L ED1 and the second L ED light source L ED2 which are connected in parallel is respectively connected with the positive pole + and the negative pole of a power supply through a first switch circuit and a second switch circuit, the second end OUT-of the first L ED light source L ED1 and the second L ED light source L ED2 which are connected in parallel is respectively connected with the positive pole + and the negative pole of the power supply through a capacitor C1 and a capacitor C2, the control ends of the first switch circuit and the second switch circuit are connected with a bipolar PWM control signal through an isolation circuit, and the first switch circuit and the second switch circuit are driven to be alternately conducted by the PWM control signal.

Specifically, the power supply is a dc power supply, such as a 12V dc power supply, a 24V dc power supply, and the like, and can be specifically selected according to actual needs.

In this embodiment, the first switch circuit is preferably implemented by using an NMOS transistor Q1, which has low power consumption and high reliability, the drain of the NMOS transistor Q1 is connected to the positive electrode of the power supply, and the source of the NMOS transistor Q1 is connected to the first end OUT + of the parallel connection of the first L ED light source L ED1 and the second L ED light source L ED2, and the gate of the NMOS transistor Q1 is connected to the PWM control signal through an isolation circuit.

The second switch circuit is preferably implemented by using an NMOS transistor Q2, and has low energy consumption and high reliability, the drain of the NMOS transistor Q2 is connected to the source of the NMOS transistor Q1 and is connected to the first end OUT + of the first L ED light source L ED1 and the second L ED light source L ED2, which are connected in parallel, the source of the NMOS transistor Q2 is connected to the negative electrode of the power supply, and the gate of the NMOS transistor Q2 is connected to the PWM control signal through an isolation circuit.

In this specific embodiment, the isolation circuit is preferably implemented by using a magnetic ring T, the circuit structure is simple, the implementation is easy, and the cost is low, a main turn coil N1 of the magnetic ring T is connected to a PWM control signal, a first turn coil N2 of the magnetic ring T is connected between the gate and the source of the NMOS transistor Q1, a second turn coil N3 of the magnetic ring T is connected between the gate and the source of the NMOS transistor Q2, and the first turn coil N2 and the second turn coil N3 have the same-name ends opposite to each other, and a more specific structure is shown in fig. 1, which is not described in detail.

Of course, in other embodiments, the isolation circuit may be implemented by using other existing isolation circuits, such as an optical coupling isolation circuit.

In this embodiment, the PWM control signal can be output by using various existing PWM signal generating circuits, for example, a single chip microcomputer is used to output the PWM control signal, which can be easily implemented by those skilled in the art and is not described in detail.

The working principle is as follows:

when the PWM control signal is in a high (positive) level, the NMOS tube Q1 is conducted, the NMOS tube Q2 is cut off, current flows from the positive pole of a power supply + to the first L ED light source L ED1 to the capacitor C2 and then to the negative pole of the power supply through the NMOS tube Q1, when the PWM control signal is in a negative level, the NMOS tube Q2 is conducted, the NMOS tube Q1 is cut off, current flows from the positive pole of the power supply + to the first L ED light source L ED1 through the capacitor C1 and then to the negative pole of the power supply through the NMOS tube Q2, color modulation can be achieved by adjusting the conduction percentages of the NMOS tubes Q1 and Q2, dimming can be achieved by adjusting the conduction time of the NMOS tubes Q1 and Q2 in unit time, namely, dimming and color modulation by adopting a single-path PWM control signal is achieved, the cost is low, the procedure is simple, the PWM control signal is isolated from a main loop, only two output lines are needed, the circuit is simple, the cost is easy to distinguish the positive.

Example two

As shown in fig. 2, the difference between the present embodiment and the first embodiment is: the first switch circuit and the second switch circuit are both implemented by NPN triodes, and the specific circuit connection relationship is detailed in fig. 2, which is not described in detail.

The working principle of the present embodiment is similar to that of the first embodiment, and reference may be made to the first embodiment specifically, which is not described in detail.

The utility model is suitable for a L ED illumination lamps and lanterns of various needs switch light flux and colour temperature, like dull and stereotyped lamp, ceiling lamp, down lamp etc. can be competent in any occasion completely, for example art gallery, museum etc. need adjust the place that different light fluxes and colour temperature state required and use, the scope of involving includes L ED lamps and lanterns such as civilian illumination, commercial illumination, industrial illumination.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An L ED dimming and color-mixing circuit is characterized by comprising a first switch circuit, a second switch circuit, an isolation circuit, a capacitor C1, a capacitor C2, a first L ED light source and a second L ED light source, wherein the first L ED light source and the second L ED light source are different in color temperature and are arranged in an inverse parallel mode, first ends of the first L ED light source and the second L ED light source which are connected in parallel are respectively connected with the positive electrode and the negative electrode of a power source through the first switch circuit and the second switch circuit, second ends of the first L ED light source and the second L ED light source which are connected in parallel are respectively connected with the positive electrode and the negative electrode of the power source through the capacitor C1 and the capacitor C2, control ends of the first switch circuit and the second switch circuit are connected with a bipolar PWM control signal through the isolation circuit, and the first switch circuit and the second switch circuit are driven to be alternately conducted through the PWM control signal.

2. The L ED dimming and color-adjusting circuit as claimed in claim 1, wherein the first switch circuit is implemented by MOS transistor.

3. The L ED dimming and color-adjusting circuit according to claim 2, wherein the first switch circuit is implemented by an NMOS transistor Q1, a drain of the NMOS transistor Q1 is connected to a positive electrode of a power supply, a source of the NMOS transistor Q1 is connected to a first end of the first L ED light source and the second L ED light source which are connected in parallel, and a gate of the NMOS transistor Q1 is connected to a PWM control signal through an isolation circuit.

4. The L ED dimming and color-adjusting circuit according to claim 3, wherein the second switch circuit is implemented by MOS transistors.

5. The L ED dimming and color-adjusting circuit according to claim 4, wherein the second switch circuit is implemented by an NMOS transistor Q2, a drain of the NMOS transistor Q2 is connected to the first end of the first L ED light source and the second L ED light source connected in parallel, a source of the NMOS transistor Q2 is connected to a negative electrode of the power supply, and a gate of the NMOS transistor Q2 is connected to the PWM control signal through an isolation circuit.

6. The L ED dimming and color-mixing circuit as claimed in claim 5, wherein the isolation circuit is implemented by a magnetic loop T, a main winding of the magnetic loop T is connected with the PWM control signal, a first sub-winding of the magnetic loop T is connected between the gate and the source of the NMOS transistor Q1, a second sub-winding of the magnetic loop T is connected between the gate and the source of the NMOS transistor Q2, and the first sub-winding is opposite to the second sub-winding in the same name.

7. The L ED dimming and color-adjusting circuit as claimed in claim 1, wherein the first L ED light source is composed of multiple LEDs connected in series.

8. The L ED dimming and color-adjusting circuit as claimed in claim 1, wherein the second L ED light source is composed of multiple LEDs connected in series.

9. L ED lamp, characterized by the L ED dimming and color-adjusting circuit of any one of claims 1-8.