CN218998325U

CN218998325U - Light mixing device of full-color video lamp

Info

Publication number: CN218998325U
Application number: CN202222419367.XU
Authority: CN
Inventors: 刘阳; 杨文丰; 李威
Original assignee: Shenzhen Yingse Photographic Equipment Co ltd
Current assignee: Shenzhen Yingse Photographic Equipment Co ltd
Priority date: 2022-09-13
Filing date: 2022-09-13
Publication date: 2023-05-09
Anticipated expiration: 2032-09-13

Abstract

The utility model discloses a light mixing device of a full-color video lamp, which comprises a DCtoDC constant voltage circuit, wherein the DCtoDC constant voltage circuit is electrically connected with a linear constant current circuit, the linear constant current circuit is electrically connected with a plurality of LED light sources, and a frog eye lens is arranged on the outer cover of the LED light sources; the LED light source is a CWRGB light source. The utility model solves the problem that the full-color point light source is difficult to mix light, can effectively reduce the product volume of the full-color point light source, improve the illuminance of the product, reduce the influence of mixed light on the ginseng, and can also reduce the cost of the light source, thereby having wide application prospect.

Description

Light mixing device of full-color video lamp

Technical Field

The utility model mainly relates to various LED photographic lamps, LED stage lamps, LED landscape brightening lamps, LED illuminating lamps, other special application fields and the like, in particular to a light mixing device of a full-color video lamp.

Background

Currently, the common photography lamps in the market are tungsten filament lamps, dysprosium lamps and LED lamps, and the history stage is gradually exited because the energy efficiency of the tungsten filament lamps and the dysprosium lamps is too low and the environment is not protected. While the high energy efficiency and lightweight LED photography lamps are gradually replacing the traditional tungsten filament and dysprosium lamps.

As LED lamps are increasingly used, the requirements of people on LEDs are also increasing, especially on LED lamps with variable color and full color. At present, conventional color video lamps are basically plane lamps or bar lamps, the light emission of the lamps is surface light emission, the surface light source has low requirement on light mixing, and the diffusion sheet is basically added to enable the light emission of the lamps to be more uniform. With the increasing popularity of LED video lamps, the light mixing device of the full-color video lamps is not limited to a common surface light source, and video lamps with full-color point light sources are increasingly popular with users. However, the full-color point light source has high requirements on light mixing, even if the bare light source can achieve better light mixing effect, the original light mixing can be thoroughly changed by the optical accessory once the optical accessory is added, so that the final colored light shows the phenomenon of flowers, green and blue, and the final light cannot meet the use requirements, and therefore, the full-color point light source lamp can meet the requirements of users only by special light mixing treatment. At present, the conventional light mixing mode is to add a light mixing cavity to make final light uniform, and although the light mixing cavity can basically solve the problem of light mixing uniformity, the light mixing cavity has more defects, for example: professional optical design is needed, and the design period is long; is huge in size; the cost is high; not obvious to the illumination improvement, etc.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a light mixing device of a full-color video lamp. The utility model solves the problem that the full-color point light source is difficult to mix light, can effectively reduce the product volume of the full-color point light source, improve the illuminance of the product, reduce the influence of mixed light on the ginseng, and can also reduce the cost of the light source, thereby having wide application prospect.

The aim of the utility model is achieved by the following technical scheme:

the utility model provides a full-color video lamp's light mixing device, includes DCtoDC constant voltage circuit, and DCtoDC constant voltage circuit electricity is connected with linear constant current circuit, and linear constant current circuit electricity is connected with a plurality of LED light sources, and the LED light source dustcoat is equipped with frog eye lens.

Further improvement, the LED light source is a single-color temperature light source, a double-color temperature light source, a four-color full-color light source, a five-color full-color light source or a multi-color full-color light source.

Further improved, the multicolor full-color light source is a CWRGB light source.

Further improved, the CWRGB light source adopts 3030 packaged warm white light and 3030 packaged cold white light, and simultaneously matches 3030 three-in-one packaged RGB lamp beads, and adopts a series-parallel mode, so that the lamp beads of each color of each quadrant are uniformly distributed.

Further improved, the DCtoDC constant voltage circuit comprises a switch constant voltage chip, wherein a first pin of the switch constant voltage chip is electrically connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is grounded and electrically connected with one end of a first capacitor C1; the other end of the first capacitor C1 is electrically connected with one end of the first resistor R1 and a seventh pin of the switch constant voltage chip; the other end of the first resistor R1 is electrically connected with one end of the first inductor L1, one end of the third resistor R3, one end of the sixth capacitor C6 and the anode of the fifth electrolytic capacitor C5; the other end of the first inductor L1 is electrically connected with the anode of the first diode D1 and the drain electrode of the first MOS tube Q1, and the cathode of the first diode D1 is electrically connected with the anode of the LED light source 1, the anode of the third electrolytic capacitor C3 and one end of the fourth resistor R4; the other end of the fourth resistor R4 is electrically connected with one end of the fifth resistor R5 and a fourth pin of the switch constant voltage chip; the other end of the fifth resistor R5 is electrically connected with the negative electrode of the third electrolytic capacitor C3, one end of the ninth resistor R9 and is grounded, the other end of the ninth resistor R9 is electrically connected with the source electrode of the first MOS tube Q1, and the grid electrode of the first MOS tube Q1 is electrically connected with the eighth pin of the switch constant voltage chip; the fifth pin of the switch constant voltage chip is electrically connected with one end of an eighth resistor R8, and the other end of the eighth resistor R8 is grounded; the other end of the third resistor R3 is electrically connected with the second pin of the switch constant voltage chip and one end of the seventh resistor R7; the other end of the seventh resistor R7 is electrically connected with the negative electrode of the fifth electrolytic capacitor C5, the other end of the sixth capacitor C6, one end of the seventh capacitor C7 and one end of the eighth capacitor C8 and is grounded; the other end of the eighth capacitor C8 is electrically connected with one end of the sixth resistor R6, and the other end of the sixth resistor R6 is electrically connected with the other end of the seventh capacitor C7 and the third pin of the switch constant voltage chip.

Further improved, the switch constant voltage chip is a switch constant voltage chip FP5207U2.

Further improved, the sixth pin of the switch constant voltage chip is grounded.

Further improvement, the linear constant current circuit comprises one end of a power supply resistor R2 electrically connected with the cathode of a first diode D1, the other end of the power supply resistor R2 is electrically connected with a first pin of a linear constant current chip and one end of a power supply capacitor C4, the other end of the power supply capacitor C4 is electrically connected with an eighth pin of the linear constant current chip, one end of a current detection resistor R10 and is grounded, and the other end of the current detection resistor R10 is electrically connected with a fifth pin and a sixth pin of the linear constant current chip; the second pin of the linear constant current chip is connected with a PWM driving signal, and the fourth pin of the linear constant current chip is connected with the cathode of the LED light source 1.

Further improvement, the linear constant current chip is a linear constant current chip H7310U1; the full-color video lamp is an LED photographic lamp, an LED stage lamp, an LED landscape brightening lamp or an LED illuminating lamp.

The utility model has the following beneficial effects:

the utility model solves the problem that the full-color point light source is difficult to mix light, can effectively reduce the product volume of the full-color point light source, improve the illuminance of the product, reduce the influence of mixed light on the ginseng, and can also reduce the cost of the light source, thereby having wide application prospect.

Drawings

The utility model is further illustrated by the accompanying drawings, the content of which does not constitute any limitation of the utility model.

FIG. 1 is a schematic side view of a frog-eye lens;

FIG. 2 is a schematic diagram of the front structure of a frog-eye lens;

fig. 3 is a circuit diagram of the DCTODC constant voltage section and the linear constant current and control section.

Detailed Description

The utility model will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the utility model more apparent.

Example 1

A light mixing device of full-color video lamp comprises a light source, a light emitting diode and a light emitting diode, wherein the light mixing device of full-color video lamp comprises a:

FIGS. 1 and 2 are frog-eye lenses (also called LED aspheric condenser lenses), which are core components of the light mixing system, the size of such lenses can be adjusted at will according to the size of the light source, and the condensing angle and shape can also be adjusted at will in combination with the light source; fig. 2 shows a full color point light source, but the light source can also be single color temperature, double color temperature, four color full color, five color full color, and multiple color full color.

The design of the light source must be matched with the lens to exert good effect. The CWRGB light source adopts warm white light packaged by 3030 and cold white light packaged by 3030, and simultaneously is matched with RGB lamp beads packaged by 3030 in three-in-one mode. The light beads of each color of each quadrant are uniformly distributed by adopting a series-parallel connection mode. The comprehensive light emitting angle of the light source, the angle and the structure of the lens are required to meet specific optical requirements, so that the final light mixing effect can meet the requirements.

The DCTODC constant voltage part of fig. 3 is a boost topology, U2 is a switch constant voltage chip FP5207, and the voltages of the mismatched LEDs are boosted to voltages C5 and C6 capable of being matched with the LED light beads, and are used as input energy storage filter capacitors; c3 is an output energy storage filter capacitor; r8 is a chip working frequency setting resistor; c2 is a voltage stabilizing filter capacitor driven by the FP 5207; d1 is schottky diode parallel connection as freewheeling diode, when MOSFET turns off, provides current path for inductance, and R4, R5 divide output voltage to obtain voltage value and the reference voltage comparison inside IC to control output voltage. R6, C7 and C8 form RC network, and form compensation network with the operational amplifier in IC, and adjust feedback gain and frequency bandwidth control, thereby adjusting output.

And the linear constant current and control part, PWM is a driving signal connected with an I/O port of the singlechip and is a specific driving signal sent by the MCU according to an algorithm, so that light reaching the requirement of a user is mixed. U1 is a linear constant current chip H7310, which can make the LED current constant to a set value. LED lamp beads are connected between the LED+ and the LED-, the linear constant current chip is powered by direct Vled+, and the LED+ is connected with the output of DCTODC. The LED is connected to H7310 and finally connected to a current limiting resistor R10; the singlechip generates PWM adjustable signals, when the PWM is at a high level, the current output to the LED is a set value, when the PWM signal is at a low level, the current output to the LED is 0, when the duty ratio of the PWM is increased, the equivalent current is linearly increased in one PWM period, the PWM frequency is adjustable and the duty ratio is adjustable, the frequency is generally more than 20KHz, and the current flowing through the LED lamp beads is directly changed by changing the duty ratio, so that the luminous brightness of the lamp beads is changed.

The full-color video lamp has higher requirements on the dimming gray scale and the precision of a single-channel hardware circuit, especially on low power and higher requirements on the precision of a driving circuit. Therefore, in order to achieve a good effect, the light mixing system adopts a linear constant-current driving framework. The system has the characteristics of good linearity, high adjustment precision, low brightness and the like. R10 is a current sensing resistor for setting the magnitude of the LED driving current; c4 is the supply capacitor of H7310 for providing a stable supply voltage to H7310 in combination with supply resistor R2.

The light source is lighted and emits light through a driving circuit (the common driving of the LED comprises constant voltage driving, constant current driving and PWM driving, the PWM driving is suitable for lamps with higher light mixing requirements, and the constant current driving or the constant voltage driving can be also adopted for occasions with low requirements. But the light does not undergo any optical treatment and can exhibit non-uniformity in color and light spots. Because the light is scattered, the corresponding illuminance is not very high, and the uniform light meeting the requirements of users can be finally mixed after various reflections, refractions and mixing of the light with different colors are carried out through the lens, even if common optical accessories such as a standard cover, a soft light ball, a radar cover and the like are matched, the mixed light can be still uniform.

When in use, the lens is tightly attached to the upper part of the light source, the diameter of the light emitting surface of the light source cannot be larger than that of the bottom columnar cylinder of the lens, and the smaller the light emitting surface of the light source is, the better the light emitting power and the heat dissipation are allowed.

The lens also has the function of condensing light, so that ambient stray light can be collected and utilized. Therefore, the final illumination of the lens can be improved by 1.5-4 times. The lens still has good light mixing and illuminance improving effects for white light with single color temperature and white light with double color temperature. The light emitting surface of the light source must be smaller than the diameter of the cavity at the bottom of the lens when in use.

The volume of the light mixing system adopting the lens and the light source can be greatly reduced compared with that of a common light mixing cavity, if the light source with the same size is used for mixing light by adopting the light mixing cavity, the structure of the light source part of the product can be much more complicated and also can be much longer, and the light mixing system is a perfect choice for products with requirements on the appearance and the volume of the product. Meanwhile, the lens has the advantages of little influence on the final optical parameters, temperature resistance and high cost due to the special material.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims

1. The light mixing device of the full-color video lamp is characterized by comprising a DCtoDC constant voltage circuit, wherein the DCtoDC constant voltage circuit is electrically connected with a linear constant current circuit, the linear constant current circuit is electrically connected with a plurality of LED light sources, and a frog eye lens is arranged on an outer cover of each LED light source.

2. The light mixing device of claim 1, wherein the LED light source is a single color temperature light source, a double color temperature light source, a four color full color light source, a five color full color light source, or a multi color full color light source.

3. The light mixing device of claim 2, wherein the multi-color full-color light source is a CWRGB light source.

4. The light mixing device of the full-color video lamp as claimed in claim 3, wherein the CWRGB light source adopts warm white light packaged 3030 and cold white light packaged 3030, and simultaneously matches with three-in-one packaged RGB beads 3030, and adopts a parallel-serial mode, so that the beads of each color of each quadrant are uniformly distributed.

5. The light mixing device of the full-color video lamp according to claim 1, wherein the DCto DC constant voltage circuit comprises a switch constant voltage chip, a first pin of the switch constant voltage chip is electrically connected to one end of a second capacitor (C2), and the other end of the second capacitor (C2) is grounded and electrically connected to one end of a first capacitor (C1); the other end of the first capacitor (C1) is electrically connected with one end of the first resistor (R1) and a seventh pin of the switch constant voltage chip; the other end of the first resistor (R1) is electrically connected with one end of the first inductor (L1), one end of the third resistor (R3), one end of the sixth capacitor (C6) and the anode of the fifth electrolytic capacitor (C5); the other end of the first inductor (L1) is electrically connected with the anode of the first diode (D1) and the drain electrode of the first MOS tube (Q1), and the cathode of the first diode (D1) is electrically connected with the anode of the LED light source (1), the anode of the third electrolytic capacitor (C3) and one end of the fourth resistor (R4); the other end of the fourth resistor (R4) is electrically connected with one end of the fifth resistor (R5) and a fourth pin of the switch constant voltage chip; the other end of the fifth resistor (R5) is electrically connected with the negative electrode of the third electrolytic capacitor (C3), one end of the ninth resistor (R9) and is grounded, the other end of the ninth resistor (R9) is electrically connected with the source electrode of the first MOS tube (Q1), and the grid electrode of the first MOS tube (Q1) is electrically connected with the eighth pin of the switch constant voltage chip; the fifth pin of the switch constant voltage chip is electrically connected with one end of an eighth resistor (R8), and the other end of the eighth resistor (R8) is grounded; the other end of the third resistor (R3) is electrically connected with the second pin of the switch constant voltage chip and one end of the seventh resistor (R7); the other end of the seventh resistor (R7) is electrically connected with the negative electrode of the fifth electrolytic capacitor (C5), the other end of the sixth capacitor (C6), one end of the seventh capacitor (C7) and one end of the eighth capacitor (C8) and is grounded; the other end of the eighth capacitor (C8) is electrically connected with one end of a sixth resistor (R6), and the other end of the sixth resistor (R6) is electrically connected with the other end of the seventh capacitor (C7) and a third pin of the switch constant voltage chip.

6. The light mixing device of the full-color video lamp according to claim 5, wherein the switch constant voltage chip is a switch constant voltage chip FP5207 (U2).

7. The light mixing device of claim 5, wherein a sixth pin of the switch constant voltage chip is grounded.

8. The light mixing device of the full-color video lamp according to claim 1, wherein the linear constant current circuit comprises one end of a power supply resistor (R2) electrically connected with the cathode of the first diode (D1), the other end of the power supply resistor (R2) is electrically connected with a first pin of the linear constant current chip and one end of a power supply capacitor (C4), the other end of the power supply capacitor (C4) is electrically connected with an eighth pin of the linear constant current chip, one end of a current detection resistor (R10) is grounded, and the other end of the current detection resistor (R10) is electrically connected with a fifth pin and a sixth pin of the linear constant current chip; the second pin of the linear constant current chip is connected with a PWM driving signal, and the fourth pin of the linear constant current chip is connected with the cathode of the LED light source (1).

9. The light mixing device of the full-color video lamp according to claim 8, wherein the linear constant current chip is a linear constant current chip H7310 (U1); the full-color video lamp is an LED photographic lamp, an LED stage lamp, an LED landscape brightening lamp or an LED illuminating lamp.