CN106151894B

CN106151894B - LED optical unit

Info

Publication number: CN106151894B
Application number: CN201610686843.0A
Authority: CN
Inventors: 张志海; 吴新慧; 胡俊; 程治明
Original assignee: China Energy Saving Jinghe Technology Co ltd
Current assignee: China Energy Saving Jinghe Technology Co ltd
Priority date: 2016-08-19
Filing date: 2016-08-19
Publication date: 2023-04-28
Anticipated expiration: 2036-08-19
Also published as: CN106151894A

Abstract

The invention provides an LED optical unit which comprises an optical mask, a reflecting plate, an LED lamp panel and a driving module, wherein LED lamp beads are attached to the LED lamp panel, the driving module comprises an aluminum substrate, and an LED driving circuit is distributed on the aluminum substrate. The LED driving circuit comprises a dimming control module, a filtering rectifying module and a high-voltage linear constant current module, wherein the dimming control module is connected with the high-voltage linear constant current module through a dimming signal end, one end of the filtering rectifying module is connected with alternating current mains supply, the other end of the filtering rectifying module is connected with the high-voltage linear constant current module, and the high-voltage linear constant current module is connected with at least one group of LEDs which are mutually connected in parallel and a loop of the LEDs; the reflector is embedded in the optical mask, and the LED lamp panel is fixed on the reflector. The LED optical unit provided by the invention has the advantages of uniform illumination chromaticity, good light mixing effect and low glare, greatly reduces development cost, and is convenient to clean and maintain.

Description

LED optical unit

Technical Field

The invention belongs to the technical field of semiconductor illumination, and particularly relates to an LED optical unit.

Background

In recent years, due to the development of LED technology, LED lighting has been accepted and adopted by most users, various LED lamps and lanterns are layered endlessly, and the structures of LED optical units are also various. The existing LED optical units are driven by adopting an additional LED driving power supply, and certain cost and extra volume are obviously added to the LED lamp. The linear constant current driving circuit can convert an alternating current circuit into a direct current circuit, can be directly used for driving LEDs, is currently applied to the field of LED illumination application step by step, can directly replace a driving power supply, and greatly reduces the manufacturing cost of the whole lamp. However, the current linear constant current driving circuit generally adopts a common IC chip for driving, the driving current is controlled by the IC chip, the driving output capacity of the IC chip is limited, the high-voltage linear constant current driving current cannot be output, and in order to obtain the high-voltage linear constant current driving current, a mode of superposing a plurality of IC chips is adopted for outputting, so that too many IC chips are applied, the power of the whole lamp can rise quickly when the input voltage fluctuates or rises greatly, the temperature of the IC and the temperature of a lamp bead rise greatly, the automatic over-temperature protection and the automatic over-voltage protection can be carried out too early, the lamp flicker or the lamp extinction can be caused, and if the energy storage filtering is carried out by an electrolytic capacitor with no large capacity, the stroboscopic effect of 100HZ can be generated, the reliability is poor, and the safety is low.

The traditional LED optical unit adopts an LED lens to carry out secondary light distribution design, however, most of the traditional LED lenses are designed aiming at a single light source, an LED lamp cavity is arranged at the bottom of the lens, only one LED light source can be placed, and the surface of the lens is uneven. The outdoor lamp is exposed in the air filled with pollutants such as dust, lampblack, automobile exhaust and the like for a long time, dust is easy to hide and pollute the surface of the lens, and the luminous efficiency is influenced after the surface of the lens is covered with the dust, so that the luminous flux is greatly reduced. Meanwhile, each LED light source corresponds to one lens, and the LED light source has the advantages of single light distribution form, irregular shape, high processing difficulty and high manufacturing cost. In addition, the conventional LED lamp generally has a plurality of lens surface covers, and cannot be designed optically as a whole, and thus the light energy is not fully utilized.

Disclosure of Invention

The invention aims to solve the technical problems that the existing LED optical unit has poor driving reliability, low safety level, single light distribution form and incapability of carrying out integral optical design, and provides an LED optical unit which has good safety, high reliability and multiple light distribution forms and adopts only one optical mask to carry out integral optical design.

In order to solve the technical problems of the invention, the invention is realized by the following technical scheme: the LED optical unit comprises an optical mask 1, a reflecting plate 2, an LED lamp panel 3 and a driving module 4, wherein LED lamp beads are stuck on the LED lamp panel 3, the driving module 4 comprises an aluminum substrate 41, and an LED driving circuit 42 is distributed on the aluminum substrate 41; the LED driving circuit 42 includes a dimming control module 421, a filtering rectification module 422 and a high-voltage linear constant current module 423, the dimming control module 421 is connected to the high-voltage linear constant current module 423 through a dimming signal end 424, one end of the filtering rectification module 422 is connected to an ac mains supply, the other end is connected to the high-voltage linear constant current module 423, and the high-voltage linear constant current module 423 is connected to at least one group of LEDs connected in parallel and a loop thereof; the light reflecting plate 2 is embedded in the optical mask 1, and the LED lamp panel 3 is fixed on the light reflecting plate 2.

Preferably, the dimming control module 421 includes a PWM-, a self-recovery fuse F1, a first resistor R1, an optocoupler U1, a diode D1, and a pwm+, where the optocoupler U1 includes a photodiode D2 and a triode D3, a collector of the triode D3 is connected to the second resistor R2 in series and then to the dimming signal terminal 424, an emitter of the triode D3 is grounded, the PWM-, the self-recovery fuse F1, and the first resistor R1 are sequentially connected to an input terminal of the photodiode D2, and the pwm+, the diode D1 are sequentially connected to an output terminal of the photodiode D2.

Preferably, the driving circuit 42 further includes a TVS tube connected in parallel between PWM+ and PWM-, one end of which is connected between PWM+ and diode D1, and the other end of which is connected between PWM-and self-recovering fuse F1.

Preferably, the optical mask 1 is made of transparent material, the outer surface of the optical mask 1 is a smooth curved surface to form a light-emitting surface 11, the inner surface of the optical mask 1 is an incident surface 12, and an optical cavity 13 is formed inside the optical mask 1.

Preferably, the middle part of the incident surface 12 is a light distribution surface 121, the two end parts are smooth curved surfaces 122, and two sides of the light distribution surface 121 adjacent to the smooth curved surfaces 122 are respectively provided with a clamping point 14 for positioning the reflector 2.

Preferably, the light distribution surface 121 is provided with a plurality of pleats 1211, and the pleats 1211 are connected in sequence.

Preferably, the optical mask 1 has a central axis 15 in a longitudinal direction, and the pleats 1211 are positioned highest on the central axis 15 and gradually decrease toward both sides.

Preferably, the reflector 2 is placed in the optical cavity 13; the reflector plate 2 is in the shape of "

"shape including a bottom surface 21 and two reflecting surfaces 22 extending upward from the bottom surface 21 to the light distribution surface 121; the reflecting surface 22 is seamlessly joined to the optical mask 1 and is positioned by the clip point 14.

Preferably, the light distribution surface 121 is sandwiched between the two reflection surfaces 22 to form a light distribution region.

Preferably, a window 211 for placing the light source is arranged in the center of the bottom surface 21, and the LED lamp panel 3 is fixed on the window 211.

Preferably, the optical mask 1 is provided with an edge structure 16, positioning holes 161 for fixing the optical mask 1 are uniformly arranged on the edge structure 16, and a waterproof rubber ring groove 162 is arranged on the edge structure 16.

Preferably, the thickness between the light emitting surface 11 and the incident surface 12 is 1 mm-6 mm.

Preferably, the reflector 2 is made of opaque high-reflectivity material.

Preferably, the positioning holes 161 are disposed from the edge structure 16 to the outside.

Preferably, the waterproof rubber ring groove 162 is embedded with a sealing rubber ring, so as to improve the IP protection level.

Preferably, the optical mask 1 is provided with a respirator, so that the waterproof capability can be improved, and the IP grade can be improved.

Preferably, the smooth curved surface 122 and the reflecting surface 22 form an enclosed space for accommodating electronic components.

Preferably, screw holes 212 are further formed on the bottom surface 21 of the reflector 2, so as to fix the reflector 2 to the profile.

Compared with the prior art, the invention has the beneficial effects that:

according to the LED optical unit disclosed by the invention, high-voltage linear constant current driving is adopted, an additional power supply is not needed, the product volume and cost are greatly reduced, and the miniaturization design of the product is facilitated. The filtering rectification module can effectively avoid stroboscopic of the LED lamp driven by the high-voltage linear constant current in the use process. The two ends of the dimming control module isolated by the optical coupler U1 are prevented from being directly electrically connected, so that the interference caused by the electrical connection between an internal high-voltage control circuit and an external low-voltage circuit is effectively prevented, and electric shock can be prevented. The TVS tube is connected in parallel between PWM+ and PWM-, when the outside is input high pressure, can protect through self-recovery fuse F1 and TVS tube, self-recovery fuse F1 can also effectively avoid the heavy current to damage high-voltage linear constant current module, can also avoid the instantaneous high voltage to damage the main control chip of dimming control module through the TVS tube, therefore from two angles of heavy current and instantaneous high voltage, provides the comprehensive protection of the main control chip of dimming control module.

According to the LED optical unit disclosed by the invention, the design of the optical mask and the reflecting plate is adopted, and only one set of optical mask and the reflecting plate is needed for one set of lamp, so that the cost of product development is greatly reduced. The LED optical cavity is large, and when a plurality of light sources are placed, the reflecting plate is favorable for mixing light, so that the chromaticity is uniform, and the glare is reduced. The light-emitting surface of the optical mask is smooth, adhesion and accumulation of dust are not easy, a self-cleaning effect is achieved when the optical mask is washed by natural wind and rain, and the later-stage manual maintenance cost is reduced. The traditional lens face cover is a plurality of lenses of range, and the surface is uneven, very easily deposition, and rainwater washes also can not reach clean effect. The respirator and the waterproof rubber ring are arranged on the optical mask, so that the waterproof capability and the IP grade can be improved. The LED optical unit adopts a mode of mounting from inside to outside, breaks through the traditional mode of mounting from outside, and is more beneficial to cleaning and maintenance of the surface of the optical mask.

Drawings

Fig. 1 is a structural view of an LED optical unit.

Fig. 2 is an exploded view of the LED optical unit.

Fig. 3 is a block diagram of an optical mask.

Fig. 4 is a front view of an optical mask.

Fig. 5 is a structural view of a reflector.

Fig. 6 is a schematic diagram of a driving circuit.

Reference numerals: 1. an optical mask; 11. a light-emitting surface; 12. an incidence surface; 121 light distribution surface; 1211. folding; 122. a smooth curved surface; 13. an optical cavity; 14. a stuck point; 15. a central axis; 16. an edge structure; 161. positioning holes; 162. a waterproof rubber ring groove; 2. a light reflecting plate; 21. a bottom surface; 211. a window; 212. screw holes; 22. a reflecting surface; 3. an LED lamp panel; 31. LED lamp beads; 4. a driving module; 41. an aluminum substrate; 42. an LED driving circuit; 421. a dimming control module; 422. a filtering rectification module; 423. a high voltage linear constant current module; 424. and a dimming signal terminal.

Detailed description of the preferred embodiments

Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

Referring to fig. 1 to 5, an LED optical unit comprises an optical mask 1, a reflector 2, an LED lamp panel 3 and a driving module 4, wherein LED lamp beads are attached to the LED lamp panel 3, the driving module 4 comprises an aluminum substrate 41, and an LED driving circuit 42 is distributed on the aluminum substrate 41; the LED driving circuit 42 includes a dimming control module 421, a filtering rectification module 422 and a high-voltage linear constant current module 423, the dimming control module 421 is connected to the high-voltage linear constant current module 423 through a dimming signal end 424, one end of the filtering rectification module 422 is connected to an ac mains supply, the other end is connected to the high-voltage linear constant current module 423, and the high-voltage linear constant current module 423 is connected to at least one group of LEDs connected in parallel and a loop thereof; the light reflecting plate 2 is embedded in the optical mask 1, and the LED lamp panel 3 is fixed on the light reflecting plate 2.

Further, the dimming control module 421 includes a PWM-, a self-recovery fuse F1, a first resistor R1, an optocoupler U1, a diode D1 and pwm+, the optocoupler U1 includes a photodiode D2 and a triode D3, a collector of the triode D3 is connected in series with the second resistor R2 and then connected to the dimming signal terminal 424, an emitter of the triode D3 is grounded, the PWM-, the self-recovery fuse F1 and the first resistor R1 are sequentially connected to an input terminal of the photodiode D2, the pwm+ and the diode D1 are sequentially connected to an output terminal of the photodiode D2, and direct electrical connection between two ends of the dimming control module 421 isolated by the optocoupler U1 is avoided, which not only effectively prevents interference caused by electrical connection between an internal high-voltage control circuit and an external high-voltage circuit, but also prevents electric shock. In addition, the duty ratio of the output end can be changed by adjusting the input end, and the output current is adjusted, so that the aim of accurately adjusting the power of the load LED is fulfilled.

Further, the driving circuit 42 further includes a TVS tube connected in parallel between pwm+ and PWM-, one end of which is connected between pwm+ and diode D1, and the other end of which is connected between PWM-and self-recovering fuse F1. When the high voltage is input externally, the protection can be carried out through the self-recovery fuse F1 and the TVS tube, the self-recovery fuse F1 can also effectively avoid the damage of the heavy current to the dimming control module 421, and the damage of the instantaneous high voltage to the main control chip of the dimming control module 421 can also be avoided through the TVS tube, so that the comprehensive protection of the main control chip of the dimming control module 421 is provided from the two angles of heavy current and instantaneous high voltage. As a sub-alternative, a varistor may also be connected in parallel between pwm+ and PWM-.

Further, the optical mask 1 is made of transparent material, the outer surface of the optical mask 1 is a smooth curved surface to form a light-emitting surface 11, the inner surface of the optical mask 1 is an incident surface 12, and an optical cavity 13 is formed inside the optical mask 1.

Further, the middle part of the incident surface 12 is a light distribution surface 121, the two end parts are smooth curved surfaces 122, and two sides of the light distribution surface 121 adjacent to the smooth curved surfaces 122 are respectively provided with a clamping point 14 for positioning the reflector 2.

Further, the light distribution surface 121 is provided with a plurality of wrinkles 1211, and the wrinkles 1211 are connected in sequence.

Further, the optical mask 1 has a central axis 15 in the longitudinal direction, and the pleats 1211 are positioned highest on the central axis 15 and gradually lower to both sides.

Further, the reflector 2 is arranged in the optical cavity 13; the reflector plate 2 is in the shape of "

Further, the light distribution surface 121 is sandwiched between the two reflection surfaces 22, forming a light distribution region.

Further, the reflecting plate 2 is made of an opaque high-reflectivity material, the light distribution surface 121 is sandwiched between the two reflecting surfaces 22 to form a light distribution area, the reflecting surfaces 22 are used for reflecting side light into the light distribution area, and no light is refracted out from the smooth curved surfaces 122 at the two ends of the incident surface 12.

Further, a window 211 for placing a light source is arranged in the center of the bottom surface 21, and the LED lamp panel 3 is fixed on the window 211.

Further, the optical mask 1 is provided with an edge structure 16, positioning holes 161 for fixing the optical mask 1 are uniformly arranged on the edge structure 16, and a waterproof rubber ring groove 162 is arranged on the edge structure 16.

Further, the positioning hole 161 is arranged from inside to outside of the edge structure 16, and the traditional mounting mode from outside is broken through by adopting the mounting mode from inside, so that the cleaning and maintenance of the surface of the optical mask are facilitated.

Further, the thickness between the light emitting surface 11 and the incident surface 12 is 1mm to 6mm.

Further, the waterproof rubber ring groove 162 is embedded with a sealing rubber ring, so that the IP protection level is improved.

Further, the respirator is arranged on the optical mask 1, so that the waterproof capability can be improved, and the IP grade can be improved.

Further, the smooth curved surface 122 and the reflecting surface 22 form a closed space for accommodating electronic components.

Further, screw holes 212 are further formed on the bottom surface 21 of the reflector 2, so as to fix the reflector 2 to the profile.

The above list is only one of the embodiments of the present invention. It will be obvious that the invention is not limited to the above embodiments, but that many similar variants are possible. All modifications directly derived or suggested to one skilled in the art from the present disclosure should be considered as being within the scope of the present invention.

Claims

The LED optical unit comprises an optical mask (1), a reflecting plate (2), an LED lamp panel (3) and a driving module (4), wherein LED lamp beads are attached to the LED lamp panel (3), the driving module (4) comprises an aluminum substrate (41), and an LED driving circuit (42) is distributed on the aluminum substrate (41); the method is characterized in that: the LED driving circuit (42) comprises a dimming control module (421), a filtering rectification module (422) and a high-voltage linear constant current module (423), wherein the dimming control module (421) is connected with the high-voltage linear constant current module (423) through a dimming signal end (424), one end of the filtering rectification module (422) is connected with alternating current mains supply, the other end of the filtering rectification module is connected with the high-voltage linear constant current module (423), and the high-voltage linear constant current module (423) is connected with at least one group of LEDs which are mutually connected in parallel and a loop of the LEDs; the light reflecting plate (2) is embedded in the optical mask (1), and the LED lamp panel (3) is fixed on the light reflecting plate (2); the dimming control module (421) comprises a PWM-, a self-recovery fuse F1, a first resistor R1, an optocoupler U1, a diode D1 and PWM+, wherein the optocoupler U1 comprises a photodiode D2 and a triode D3, the collector of the triode D3 is connected with the dimming signal end (424) after being connected with a second resistor R2 in series, the emitter of the triode D3 is grounded, the PWM-, the self-recovery fuse F1 and the first resistor R1 are sequentially connected with the input end of the photodiode D2, and the PWM+ and the diode D1 are sequentially connected with the output end of the photodiode D2; the LED driving circuit (42) further comprises a TVS tube, the TVS tube is connected in parallel between the PWM+ and the PWM-, one end of the TVS tube is connected between the PWM+ and the diode D1, the other end of the TVS tube is connected between the PWM-and the self-recovery fuse F1, and a screw hole (212) is further formed in the bottom surface (21) of the reflector (2).
2. The LED optical unit of claim 1, wherein: the optical mask (1) is made of transparent materials, the outer surface of the optical mask is a smooth curved surface to form a light-emitting surface (11), the inner surface of the optical mask (1) is an incident surface (12), and an optical cavity (13) is formed in the optical mask (1).
3. The LED optical unit of claim 2, wherein: the light distribution surface (121) is arranged in the middle of the incidence surface (12), the smooth curved surfaces (122) are arranged at the two end parts, and the clamping points (14) for positioning the reflecting plate (2) are respectively arranged at the two sides of the light distribution surface (121) adjacent to the smooth curved surfaces (122).
4. An LED optical unit as recited in claim 3, wherein: the light distribution surface (121) is provided with a plurality of folds (1211), and the folds (1211) are connected in sequence.
5. An LED optical unit as recited in claim 3, wherein: the reflector (2) is arranged in the optical cavity (13); the reflector (2) is in the shape of "
"shape including a bottom surface (21) and two reflecting surfaces (22) extending upward from the bottom surface (21) to the light distribution surface (121); the reflecting surface (22) is in seamless connection with the optical mask (1) and is positioned by the clamping point (14).
6. An LED optical unit as recited in claim 5, wherein: the light distribution surface (121) is sandwiched between the two reflection surfaces (22) to form a light distribution region.
7. An LED optical unit as recited in claim 5, wherein: the center of the bottom surface (21) is provided with a window (211) for placing a light source, and the LED lamp panel (3) is fixed on the window (211).
8. The LED optical unit of claim 1, wherein: the optical mask (1) is provided with an edge structure (16), positioning holes (161) for fixing the optical mask (1) are uniformly formed in the edge structure (16), and a waterproof rubber ring groove (162) is formed in the edge structure (16).