CN213960365U

CN213960365U - LED module circuit with variable spectrum and driving circuit

Info

Publication number: CN213960365U
Application number: CN202022830151.3U
Authority: CN
Inventors: 潘安宇; 刘艳; 俞贤晓
Original assignee: Xiamen Yankon Energetic Lighting Co Ltd
Current assignee: Xiamen Yankon Energetic Lighting Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-08-13
Anticipated expiration: 2030-11-30

Abstract

The utility model provides a LED module circuit of variable spectrum, include: n LED light-emitting module circuits, wherein n is more than or equal to 2; the LED light-emitting module circuit comprises an LED light-emitting circuit and a current control circuit; the light emitting spectrums G of the LED light emitting circuits of the n LED light emitting module circuits are different, and the characteristic voltage intervals of the LED light emitting circuits of the n LED light emitting module circuits are not overlapped; the current control circuit is a linear constant current circuit which controls output current through voltage; when the voltage value detected by the voltage detection end is greater than the second comparison voltage and is less than or equal to the first comparison voltage, the anode and the cathode of the current control circuit are conducted, and the current control circuit outputs driving current to the LED light-emitting circuit; when the voltage value detected by the voltage detection end is other, the positive electrode and the negative electrode of the current control circuit are cut off. The utility model also provides a drive circuit.

Description

LED module circuit with variable spectrum and driving circuit

Technical Field

The utility model relates to a LED light emitting module circuit especially involves a LED module circuit of variable spectrum.

Background

An LED emitter has an anode and a cathode and emits an inherent spectrum when current is passed through the LED emitter. The different spectra produce different visible light colors, or infrared and ultraviolet light that are invisible to the naked eye. For a fixed illuminant, the spectral characteristics of the emitted light remain unchanged when the magnitude of the current flowing through the illuminant is different.

When a plurality of LED luminous bodies with the same property are connected in series and parallel, an LED luminous circuit is formed. The LED light-emitting circuit has positive and negative electrodes, and emits inherent spectrum when current flows between the positive and negative electrodes.

The LED light emitting circuit requires constant current driving, and when the LED light emitting circuit is driven by a current of a certain magnitude, the LED light emitting circuit is referred to as a working current, and a certain voltage is provided at two ends of the LED light emitting circuit, which is referred to as a working voltage; the LED lighting circuit has a characteristic that when a driving current is changed within a large range from an operating current, a voltage across both ends thereof deviates a small amount from the operating voltage.

When the driving current is continuously reduced, the luminous intensity of the LED is reduced in proportion. When the variation of the light emitting intensity is much lower than the light emitting intensity under the working current or the LED light emitting circuit does not emit light, the highest voltage value at the two ends is referred to as the on-voltage of the LED light emitting circuit. The voltage difference between the operating voltage and the turn-on voltage in the LED lighting circuit of the prior art is much smaller than the operating voltage.

Because the linear constant current circuit meets the process of semiconductor production, the LED light-emitting circuit and the linear constant current circuit are assembled together to form the linear constant current LED module circuit in many applications.

The linear constant-current LED module circuit is provided with a positive electrode and a negative electrode and has a voltage threshold value. When the voltage at the two ends is larger than or equal to the voltage threshold value, the current flowing through the constant current LED module circuit is constant, and the emitted spectrum and the spectrum intensity are fixed and unchanged.

When the voltage at the two ends is smaller than the voltage threshold value, the current flowing through the constant current LED module circuit rapidly drops along with the reduction of the voltage at the two ends. When the voltage at the two ends is reduced to a certain value, when the current flowing through the constant current LED module circuit reaches a certain degree, the flowing current is zero or is far smaller than the current value of normal operation, the voltage at the moment is called as breakover voltage, and then the difference value between the voltage threshold value and the breakover voltage of the linear constant current LED module circuit is approximately equal to the difference value between the working voltage and the breakover voltage of the LED light-emitting circuit and is far smaller than the working voltage threshold value. Because the linear constant current circuit has a very low conduction voltage difference, the voltage threshold of the linear constant current LED module circuit is approximately equal to the operating voltage of the LED light emitting circuit, and the conduction voltage of the linear constant current LED module circuit is approximately equal to the conduction voltage of the LED light emitting circuit.

For a particular LED lighting circuit, the emission spectrum is fixed as the amount of current it passes varies, with the spectral intensity being proportional to the average amount of current flowing. When the luminous intensity is adjusted, the absolute value of the direct current is changed, or the time duty ratio of the pulse current is adjusted, and the average current is adjusted.

When the LED lamp needs the function of changeable spectrum, the LED module circuit with changeable spectrum is adopted. The LED module circuit with variable spectrum is provided with a plurality of LED light-emitting circuits, and the light-emitting spectrums of the LED light-emitting circuits are different from each other. By controlling the amount of current flowing through one or more of the LED light circuits, the variable spectrum LED module circuit can be made to emit a mixture of one or more spectra, as well as spectral intensity. Including ultraviolet light that is invisible to the naked eye, infrared light, or a variety of colored lights that appear to the naked eye.

The LED light emitting circuits of the present common technology, which include a plurality of LED light emitting circuits within a variable spectrum LED module circuit, employ a connection method in which the LED light emitting circuits are connected in common. The connection mode has the advantage of simple control, but the number of the connected ports is more and is equal to N +1, wherein N is the number of the LED light-emitting circuits included in the variable spectrum LED module circuit.

Therefore, the method is difficult to produce in some products requiring as few connecting wires between the driving power supply and the LED module as possible.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the main technical problem that a LED module circuit of variable spectrum is provided, when inserting different voltages, sends different spectra.

In order to solve the above technical problem, the utility model provides a LED module circuit of variable spectrum, include: n LED light-emitting module circuits, wherein n is more than or equal to 2; the LED light-emitting module circuit comprises an LED light-emitting circuit and a current control circuit; the light emitting spectrums G of the LED light emitting circuits of the n LED light emitting module circuits are different, and the characteristic voltage intervals of the LED light emitting circuits of the n LED light emitting module circuits are not overlapped;

the current control circuit is a linear constant current circuit for controlling output current through voltage, and is provided with a voltage detection end for detecting the voltage of the LED light-emitting circuit, and a preset first comparison voltage and a preset second comparison voltage;

when the voltage value detected by the voltage detection end is greater than the second comparison voltage and is less than or equal to the first comparison voltage, the anode and the cathode of the current control circuit are conducted, and the current control circuit outputs driving current to the LED light-emitting circuit; when the voltage value detected by the voltage detection end is less than or equal to the second comparison voltage or greater than the first comparison voltage, the positive electrode and the negative electrode of the current control circuit are cut off.

In a preferred embodiment: the voltage detection end is external; the current control circuit is provided with three connecting ports of a positive electrode, a negative electrode and a voltage detection end.

In a preferred embodiment: the anode of the LED light-emitting circuit is connected with the voltage detection end of the current control circuit, the connection end of the LED light-emitting circuit is the anode of the LED light-emitting module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current control circuit is the cathode of the LED light-emitting module circuit.

In a preferred embodiment: the cathode of the LED light-emitting circuit is connected with the voltage detection end of the current control circuit, the connection end of the LED light-emitting circuit is the cathode of the LED light-emitting module circuit, the anode of the LED light-emitting circuit is connected with the cathode of the current control circuit, and the anode of the current control circuit is the anode of the LED light-emitting module circuit.

In a preferred embodiment: the voltage detection end is built-in and is connected with the positive electrode of the current control circuit; the current control circuit has an anode and two connection ports.

In a preferred embodiment: the anode of the LED light-emitting circuit is the anode of the LED light-emitting module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current control circuit is the cathode of the LED light-emitting module circuit.

In a preferred embodiment: the anode of the current control circuit is the anode of the LED light-emitting module circuit, the cathode of the current control circuit is connected with the anode of the LED light-emitting circuit, and the cathode of the LED light-emitting circuit is the cathode of the LED light-emitting module circuit.

In a preferred embodiment: when an external driving circuit requires a certain LED light-emitting module circuit to emit light, the voltage added at the two ends of the variable spectrum LED module circuit is corresponding specific voltage;

when the external driving circuit requires to adjust the light intensity of the current control circuit, setting the time corresponding to the specific voltage of the LED light-emitting module circuit in a preset period, and keeping the voltage at other time to be zero or setting the voltage to be the characteristic voltage of other LED light-emitting module circuits;

when the external drive circuit requires the LED module with variable spectrum to emit mixed light with multiple spectrums, the specific voltage of each LED light-emitting module circuit is output in turn in a time-division manner within a preset period, and the duration time of each characteristic voltage is set

In a preferred embodiment: the current control circuit comprises a first voltage comparison circuit, a second voltage comparison circuit, a linear constant current circuit, a first resistor and a second resistor;

the output end of the linear constant current circuit is the anode of the current control circuit, and the cathode of the linear constant current circuit is the cathode of the current control circuit; the output end of the first voltage comparison circuit and the output end of the second voltage comparison circuit are connected with the control end of the linear constant current circuit; one end of the first resistor is a voltage detection end of the current control circuit; the other end of the first resistor, one end of the second resistor, the reverse connection end of the first voltage comparison circuit and the same-direction input end of the second voltage comparison circuit are connected; the other end of the second resistor is connected with the negative electrode of the linear constant current circuit;

the non-inverting input end of the first comparison amplifying circuit is provided with a first reference voltage, and the second comparison amplifying circuit is provided with a second reference voltage.

The utility model also provides a drive circuit, the voltage of drive circuit output is used for the drive as above LED module circuit, and the characteristic voltage of its output in a cycle increases progressively in proper order or steadilys decrease.

Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:

the utility model provides a variable spectrum's LED module circuit through having set up the LED light emitting module circuit that can only be at specific voltage drive, when a plurality of LED light emitting module circuit parallel connection were in the same place, has constituted variable spectrum's LED module circuit. When the voltage at two ends of the LED module circuit with variable spectrum is in a specific magnitude, only one LED light-emitting module circuit emits light, and the LED light-emitting module circuit emits a specific spectrum. By periodically outputting different voltages in a time-sharing manner and adjusting the duration time of different specific voltages, the light-emitting intensity and different spectrums of the LED module circuit with variable spectrums can be controlled. Therefore, only two connecting ends of the anode and the cathode are needed, and under the control of external different voltages, the single-color spectrum and the mixed spectrum with different intensities can be emitted.

Drawings

Fig. 1 is a circuit structure diagram of a variable spectrum LED module circuit according to the present invention;

FIG. 2 is a circuit diagram of a sub-module circuit of the current control circuit of the external voltage detection terminal of the present invention;

FIG. 3 is a circuit diagram of a sub-module circuit of the current control circuit with a built-in voltage detection terminal according to the present invention;

fig. 4 is a circuit structure diagram of the medium current control circuit of the present invention;

fig. 5 is a graph showing the variation of the voltage step applied to both ends of the LED module with variable spectrum when five paths are fully bright in one cycle according to the present invention.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected," may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected between two elements.

Referring to fig. 1 to 5, the present embodiment provides a variable spectrum LED module circuit, which includes n LED light emitting module circuits, where n is greater than or equal to 2, and the LED light emitting module circuits are simply referred to as sub-module circuits, and the sub-module circuits each have a positive electrode and a negative electrode.

The anodes of the n sub-module circuits are connected with each other, the connecting end of the n sub-module circuits is the anode of the LED module circuit with the variable spectrum, the cathodes of the sub-module circuits included in the LED module circuit with the variable spectrum are connected with each other, and the connecting end of the n sub-module circuits is the cathode of the LED module circuit with the variable spectrum.

Suppose that the spectrum emitted when the kth sub-module circuit is powered on is Gk. The characteristic voltage of the circuit work of the kth sub-module is Vk 2-Vk 1; when the voltage accessed by the sub-module is less than or equal to a smaller voltage Vk2 or greater than a larger voltage value Vk1, the kth sub-module circuit does not emit light; when the voltage connected to the sub-module is greater than the small voltage Vk2 and less than or equal to the large voltage Vk1, the current flowing through the kth sub-module circuit is a constant value, and the light-emitting spectrum Gk is constant.

The spectrums Gk of the sub-module circuits are different from one another, and the characteristic voltage intervals of the sub-module circuits are not overlapped. Then when the utility model discloses a specific voltage of access between the positive negative pole of LED module of variable spectrum is when Vk, the kth sub-module circuit is luminous, and other sub-module circuits are all not luminous. Therefore, the light emission spectrum can be changed by changing the voltage value applied between the positive and negative electrodes of the LED module with the variable spectrum.

Between the k sub-module circuits, the central wavelength of the Gk spectrum is set in an increasing or decreasing manner according to the magnitude of the characteristic voltage Vk, that is, the central wavelength of the spectrum emitted by the sub-module circuit is set in a manner that the higher the characteristic voltage value is, or the central wavelength of the spectrum emitted by the sub-module circuit is, the longer the characteristic voltage value is, the lower the characteristic voltage value is.

Referring to fig. 5, when the external driving circuit requests a certain sub-module circuit to emit light, the voltage applied across the variable spectrum LED module is a corresponding specific voltage, and the sub-module circuit emits light. When the external circuit requires to adjust the light intensity of the sub-module circuit, it is necessary to set a period in which the time when the voltage is at the specific voltage is set, and the voltage at other times is kept at zero or set as the characteristic voltage of other sub-module circuits, and the sub-module is kept not to emit light at other times. That is, by adjusting the time duty ratio of the specific voltage, the average current of the sub-module circuit can be set, and the average luminous intensity of the sub-module circuit can be adjusted.

When the external driving circuit requires the variable-spectrum LED module to emit mixed light of multiple spectra, the specific voltage of each sub-module circuit is sequentially output in a time-division manner within one period, and the time duration at each characteristic voltage is set, so that the average light-emitting intensity of each sub-module circuit can be set, and the mixed spectrum and the light-emitting intensity emitted by the variable-spectrum LED module of the present embodiment meet the requirements.

The utility model discloses a variable spectrum's LED module's characteristics are that allow external drive power supply to pass through the different voltage of output, the submodule piece that the control corresponds is luminous to through the time size of setting when each output voltage, change each luminous intensity that corresponds submodule piece circuit, thereby realize variable spectrum's the holistic luminous intensity of LED module circuit and the regulation of luminous spectrum, its advantage is variable spectrum's LED module only needs two links.

The sub-module circuit comprises an LED light-emitting circuit and a current control circuit, wherein the LED light-emitting circuit is provided with a positive electrode and a negative electrode.

The current control circuit is an output current of the linear constant current circuit which can be controlled by the voltage, and is provided with an anode, a cathode and a voltage detection end, wherein a first comparison voltage and a second comparison voltage are arranged in the current control circuit. When the voltage value detected by the circuit control circuit is greater than the second comparison voltage and less than or equal to the first comparison voltage, the anode and the cathode of the current control circuit are conducted, and the preset maximum conducting current is obtained. When the current control circuit detects other voltage values, the positive electrode and the negative electrode of the current control circuit are cut off. Thus, the LED light-emitting circuit can be controlled to emit light or not emit light.

Referring to fig. 2, the voltage detection terminal is externally arranged, and can conveniently detect the voltage between the anode and the cathode of the sub-module circuit, so that the current control circuit has three connection ports, namely an anode, a cathode and the voltage detection terminal.

When a current control end with an external voltage detection end and an LED light-emitting circuit are adopted to form a sub-module circuit, the anode of the LED light-emitting circuit is connected with the detection end of the current control circuit, the connection end of the LED light-emitting circuit is the anode of the sub-module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current detection circuit is the cathode of the sub-module circuit; or the cathode of the LED light-emitting circuit is connected with the detection end of the current control circuit, the connection end of the LED light-emitting circuit is the cathode of the sub-module circuit, the anode of the LED light-emitting circuit is connected with the cathode of the current control circuit, and the anode of the current control circuit is the anode of the sub-module circuit.

In the sub-module circuit in the connection mode, the first voltage reference value and the second voltage reference value can be accurately set, so that the allowable value of the characteristic voltage difference between the sub-module circuits is small. However, the current control circuit needs to be connected to the positive electrode and the negative electrode of the light-emitting LED lamp circuit, and thus, the current control circuit is subject to process limitations in practical application.

Referring to fig. 3, the voltage detection terminal is built in, and the detection terminal is connected to the positive electrode, so that the current control circuit has only two connection ports, namely a positive electrode and a negative electrode. The current control circuit indirectly obtains voltage values at two ends of the submodule circuit by detecting the voltage between the anode and the cathode of the current control circuit and utilizing the working voltage value of the LED light-emitting circuit in the submodule.

When a current control circuit with a built-in voltage detection end is adopted, or the anode of the LED light-emitting circuit is the anode of the sub-module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current control circuit is the cathode of the sub-module circuit; or the anode of the current control circuit is the anode of the sub-module circuit, the cathode of the current control circuit is connected with the anode of the LED light-emitting circuit, and the cathode of the LED light-emitting circuit is the cathode of the sub-module circuit.

The circuit structure has the advantages that the current control circuit and the LED light-emitting circuit in the sub-module circuit are only provided with one connecting point, and the circuit structure is more in line with the advantages of a semiconductor packaging and processing technology. When such a circuit structure is adopted, one method is to make the reference voltages of the current control circuits used by the respective modules the same, and to achieve the difference of the characteristic circuits between the sub-modules by adopting the LED light emitting circuits with different voltages. Another method uses the same operating voltage of the LED lighting circuit, but the current control circuit between the submodules uses different values of the first reference voltage and the second reference voltage.

Referring to fig. 4, the current control circuit includes a first voltage comparison circuit, a second voltage comparison circuit, a linear constant current circuit, a first resistor and a second resistor. The linear constant current circuit comprises an output end, a negative electrode and a control end, and the first voltage comparison circuit and the second voltage comparison circuit are respectively provided with a non-inverting input end, an inverting input end and an output end.

The output end of the linear constant current circuit is the anode of the current control circuit, and the cathode of the linear constant current circuit is the cathode of the current control circuit; the output end of the first voltage comparison circuit and the output end of the second voltage comparison circuit are connected with the control end of the linear constant current circuit; one end of the first resistor is a voltage detection end of the current control circuit; the other end of the first resistor, one end of the second resistor, the reverse connection end of the first voltage comparison circuit and the same-direction input end of the second voltage comparison circuit are connected; the other end of the second resistor is connected with the negative electrode of the linear constant current circuit.

When the voltage of the detection end is divided by the first resistor and the second resistor and then is larger than the first reference voltage, the first comparison amplifying circuit outputs 0 level, and the control end of the linear constant current circuit is connected between the output end and the negative electrode of the 0 level to be cut off;

when the voltage of the detection end is divided by the first resistor and the second resistor and then is less than or equal to a second reference voltage, the second comparison circuit outputs 0 level, the control end of the linear constant current circuit is connected to 0 level, and the output end and the negative electrode of the linear constant current circuit are cut off;

when the voltage of the detection end after being divided by the first resistor and the second resistor is less than or equal to the first reference voltage and greater than the second reference voltage, the first comparison amplifying circuit and the second comparison amplifying circuit both output 1 level, the control end of the linear constant current circuit is connected to the 1 level, the output end and the negative electrode of the linear constant current circuit are conducted, and the maximum conduction current is set.

The present embodiment further provides a driving circuit, wherein the voltage output by the driving circuit is used for driving the LED module circuit, and the characteristic voltage of the output voltage sequentially increases or decreases within one period.

The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.

Claims

1. Variable spectrum LED module circuit, comprising: n LED light-emitting module circuits, wherein n is more than or equal to 2; the LED light-emitting module circuit comprises an LED light-emitting circuit and a current control circuit; the light emitting spectrums G of the LED light emitting circuits of the n LED light emitting module circuits are different, and the characteristic voltage intervals of the LED light emitting circuits of the n LED light emitting module circuits are not overlapped;

2. The variable spectrum LED module circuit of claim 1, wherein: the voltage detection end is external; the current control circuit is provided with three connecting ports of a positive electrode, a negative electrode and a voltage detection end.

3. The variable spectrum LED module circuit of claim 2, wherein: the anode of the LED light-emitting circuit is connected with the voltage detection end of the current control circuit, the connection end of the LED light-emitting circuit is the anode of the LED light-emitting module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current control circuit is the cathode of the LED light-emitting module circuit.

4. The variable spectrum LED module circuit of claim 2, wherein: the cathode of the LED light-emitting circuit is connected with the voltage detection end of the current control circuit, the connection end of the LED light-emitting circuit is the cathode of the LED light-emitting module circuit, the anode of the LED light-emitting circuit is connected with the cathode of the current control circuit, and the anode of the current control circuit is the anode of the LED light-emitting module circuit.

5. The variable spectrum LED module circuit of claim 1, wherein: the voltage detection end is built-in and is connected with the positive electrode of the current control circuit; the current control circuit has an anode and two connection ports.

6. The variable spectrum LED module circuit of claim 5, wherein: the anode of the LED light-emitting circuit is the anode of the LED light-emitting module circuit, the cathode of the LED light-emitting circuit is connected with the anode of the current control circuit, and the cathode of the current control circuit is the cathode of the LED light-emitting module circuit.

7. The variable spectrum LED module circuit of claim 5, wherein: the anode of the current control circuit is the anode of the LED light-emitting module circuit, the cathode of the current control circuit is connected with the anode of the LED light-emitting circuit, and the cathode of the current control circuit is the cathode of the LED light-emitting module circuit.

8. The variable spectrum LED module circuit of claim 1, wherein: when an external driving circuit requires a certain LED light-emitting module circuit to emit light, the voltage added at the two ends of the variable spectrum LED module circuit is corresponding specific voltage;

when the external driving circuit requires to adjust the light emitting intensity of the LED light emitting module circuit, setting the time corresponding to the specific voltage of the LED light emitting module circuit in a preset period, and keeping the voltage at other time to be zero or setting the voltage to be the characteristic voltage of other LED light emitting module circuits;

when the external driving circuit requires the variable-spectrum LED module to emit mixed light of a plurality of spectra, the specific voltage of each LED light-emitting module circuit is sequentially output in a time-division manner within a preset period, and the duration time of each characteristic voltage is set.

9. The variable spectrum LED module circuit of any of claims 1-8, wherein: the current control circuit comprises a first voltage comparison circuit, a second voltage comparison circuit, a linear constant current circuit, a first resistor and a second resistor;

10. A drive circuit, characterized by: the voltage output by the driving circuit is used for driving the LED module circuit of any one of claims 1-9, and the characteristic voltage of the output voltage of the driving circuit in one period sequentially increases or decreases.