CN206452574U - A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps - Google Patents
A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps Download PDFInfo
- Publication number
- CN206452574U CN206452574U CN201720022519.9U CN201720022519U CN206452574U CN 206452574 U CN206452574 U CN 206452574U CN 201720022519 U CN201720022519 U CN 201720022519U CN 206452574 U CN206452574 U CN 206452574U
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- led
- unit
- control unit
- chip microcomputer
- main control
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/305—Frequency-control circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a kind of high-precision LED frequency modulation systems and LED frequency modulation lamps, provided with LED luminescence units, the LED luminescence units connecting valve switch unit and charging control unit, single-chip microcomputer main control unit is additionally provided with, the single-chip microcomputer main control unit connects the switch switching unit, charging control unit, frequency adjustment unit, light sensor unit, display unit.Implement a kind of high-precision LED frequency modulation systems and LED frequency modulation lamps that the utility model is provided, by the closed loop controlling structure of the light sensor with feedback, rotary encoder and single-chip microcomputer main control unit, cause that the flash frequency of actual generation is accurate and stable by the control algolithm of single-chip microcomputer main control unit；Using the power supply mode of AC charging, direct current supply, there is provided on the premise of to flash frequency stabilized power source so that device is more environmentally friendly convenient, can depart from external power supply and isolated operation, and practicality is wider, with vast application prospect.
Description
Technical field
The utility model is related to LED frequency modulation technologies field, more particularly to a kind of high-precision LED frequency modulation systems and LED are adjusted
Frequency lamp.
Background technology
LED is as a kind of light fixture of light source, Yin Qifa using light emitting diode (Light Emitting Diode)
The advantages of light efficiency height, energy saving, good anti-seismic performance and be widely used in various scenes.LED in the market is led to
AC and DC can be often divided into power two ways, because alternating current has certain frequency, so the LED of Alternating Current Power Supply exists
It is luminous with supply and AC identical frequency under normal circumstances, but ac power supply method has two subject matters, and one is alternating current warp
Its intrinsic frequency is still had after overmodulated circuit transformation and rectification, this intrinsic frequency can produce interference to strobe signal frequency,
Cause the frequencies of the actual flickers of LED and unstable and accurate；Two be no internal cell, it is impossible to departs from external power supply and uses.
And the frequency modulation control mode of existing adjustable frequency LED is open-loop control structures, that is to say, that frequency modulation control is only
Be responsible for output frequency, without measuring and feeding back to output frequency, thus frequency modulation precision it cannot be guaranteed that.
In addition, the Chinese patent that Patent No. ZL201410445221 is provided《A kind of LED automatic synchronizations strobe apparatus and its
Control method》In strobe signal triggered by external knob, this mode has two subject matters, one be need button or
Knob perseveration LED could continue to flash, and influence device service life, and two be that external signal precision is difficult to control, and is unfavorable for
Stablize lasting stroboscopic output.
The content of the invention
The utility model provides a kind of high-precision LED frequency modulation systems and LED frequency modulation lamps, solves using the light with feedback
The closed loop controlling structure of dependent sensor, rotary encoder and single-chip microcomputer main control unit carrys out the accurate technology for adjusting flash frequency and asked
Topic.
To solve above technical problem, the utility model provides a kind of high-precision LED frequency modulation systems, luminous provided with LED
Unit, the LED luminescence units connecting valve switch unit and charging control unit, are additionally provided with single-chip microcomputer main control unit, described
Single-chip microcomputer main control unit connects the switch switching unit, charging control unit, frequency adjustment unit, light sensor unit, aobvious
Show unit；
The switch switching unit is provided with switch module, is controlled by the Switch State Combination in Power Systems of the switch module described
LED luminescence units on-off, restart, and display switch control signal is sent to the single-chip microcomputer main control unit；
The frequency adjustment unit is used to produce frequency adjusting signals, sets target glow frequency value；
The light sensor unit is used for the actual glow frequency value for measuring the LED luminescence units；
The single-chip microcomputer main control unit is used for the deviation according to actual glow frequency value and target the glow frequency value, adopts
The actual glow frequency value of LED luminescence units is adjusted to reach target glow frequency value with control algolithm；
The single-chip microcomputer main control unit is additionally operable to single according to the display switch control signal of the reception control display
First display target glow frequency value and actual glow frequency value.
Further, the LED luminescence units are provided with LED/light source；The switch module of the switch switching unit is included extremely
A few shift knob.
Further, the charging control unit is provided with rechargeable battery and is connected to the rechargeable battery both positive and negative polarity two
End and the battery charger of the single-chip microcomputer main control unit.
Further, the frequency adjustment unit is provided with adjusting knob and is connected to the adjusting knob and the single-chip microcomputer
Rotary encoder between main control unit；The encoded radio for changing the rotary encoder by rotating the adjusting knob is set not
The same target glow frequency value.
Further, the single-chip microcomputer main control unit is provided with microcontroller and internal clocking, and the internal clocking controls institute
State target glow frequency value, the triggering of the frequency of actual glow frequency value.
Further, the light sensor unit is provided with light sensor, and the light sensor gathers the LED light
The intensity of illumination in source, according to the irradiation time interval or fall time interval of the intensity of illumination, obtains the luminous frequency of the reality
Rate value.
Further, the display unit is provided with LCD display, is additionally operable to show what the single-chip microcomputer main control unit was sent
Battery real time electrical quantity information and battery real time temperature information.
The utility model also provides a kind of high-precision LED frequency modulation lamp, provided with LED stocks, base and the connection bottom
The support of seat and LED stocks；The base, support and LED stock mounted insides have PCB plates；The pcb board is sent out provided with LED
Light unit, single-chip microcomputer main control unit, light sensor unit, frequency adjustment unit, charging control unit, display unit and switch are cut
Change unit.
Further, the support is deformable support；The LED stocks surface is provided with the chimeric LED and lighted
The LED perforates of the LED/light source of unit；The susceptor surface is provided with the electricity for the AC charger for being fitted together to the charging control unit
Line perforate, be fitted together to the light sensor unit light sensor sensor aperture, be fitted together to the switch switching unit and open
Close the button perforate, the knob perforate of the adjusting knob of the chimeric frequency adjustment unit, the chimeric display unit of button
The LCD perforates of LCD display.
A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps that the utility model is provided, pass through the photosensitive biography with feedback
The closed loop controlling structure of sensor, rotary encoder and single-chip microcomputer main control unit, is made by the control algolithm of single-chip microcomputer main control unit
Obtain the actual flash frequency produced accurate and stable；Using the power supply mode of AC charging, direct current supply, there is provided to flash frequency
On the premise of stabilized power source so that device is more environmentally friendly convenient, external power supply can be departed from and isolated operation, practicality is wider；It is logical
Cross button and knob and controlled and frequency regulation to carry out the switch of device, and pass through the operation of display unit display system and device
State, the design for both having met hommization in turn ensure that the publicity and validity of information, with vast application prospect.
Brief description of the drawings
Fig. 1 is a kind of system module figure for high-precision LED frequency modulation systems that the utility model embodiment is provided；
Fig. 2 is a kind of circuit theory sketch for high-precision LED frequency modulation systems that the utility model embodiment is provided；
Fig. 3 is a kind of structural representation for high-precision LED frequency modulation devices that the utility model embodiment is provided.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe.Following component is only preferred embodiment, and the limitation to the utility model protection domain is not constituted.
It is a kind of system module figure for high-precision LED frequency modulation systems that the utility model embodiment is provided referring to Fig. 1.
In the present embodiment, described a kind of high-precision LED frequency modulation systems, provided with LED luminescence units 10, the LED luminescence units
10 connecting valve switch units 20 and charging control unit 30, are additionally provided with single-chip microcomputer main control unit 40, the single-chip microcomputer master control list
The connection of member 40 switch switching unit 20, charging control unit 30, frequency adjustment unit 50, light sensor unit 60, display
Unit 70；
The switch switching unit 20 is provided with switch module, and the switch module includes at least one shift knob；It is logical
The Switch State Combination in Power Systems for crossing the shift knob controls the on-off of the power supply of LED luminescence units 10, restarted, and to institute
State single-chip microcomputer main control unit 40 and send display switch control signal；
The frequency adjustment unit 50 is used to produce frequency adjusting signals, sets target glow frequency value K；
The light sensor unit 60 is used for the actual glow frequency value K ' for measuring the LED luminescence units 10；
The single-chip microcomputer main control unit 40 is used for according to the inclined of the actual glow frequency value K ' and target glow frequency value K
Difference, the actual glow frequency value K ' of LED luminescence units 10 using control algolithm be adjusted to reach target glow frequency value K；
The single-chip microcomputer main control unit 40 is additionally operable to control the display according to the display switch control signal of reception
The display target glow frequency value K of unit 70 and actual glow frequency value K '.
It is a kind of circuit theory letter for high-precision LED frequency modulation systems that the utility model embodiment is provided referring to Fig. 2
Figure.In the present embodiment, the LED luminescence units 10 are mainly provided with LED/light source 11, can be provided with varying number according to user's request
And the LED for different purposes of different colours；The switch module of the switch switching unit 20 is pressed including at least one switch
Button 21, such as, in the case where only setting a shift knob 21, shift knob 21 described in short-press carries out LED luminescence units 10
UNICOM and disconnection, long-press shift knob 21 can force single-chip microcomputer main control unit 40 to restart, and double-clicking shift knob 21 can cut
Change display unit 70 and show different contents.Above-mentioned functions can also be by setting multiple switch button 21 to realize.
The charging control unit 30 is provided with rechargeable battery 31 and is connected to the positive and negative end of rechargeable battery 31
With the battery charger 32 of the single-chip microcomputer main control unit 40；In this way, using the power supply mode of AC charging, direct current supply, carrying
On the premise of supplying flash frequency stabilized power source so that more environmentally friendly convenient with the device of the system, external power supply can be departed from
And isolated operation, practicality is wider.Rechargeable battery 31 can control AC charger 26 to enter by the single-chip microcomputer main control unit 40
Row intelligent charge, is started to charge up when battery electric quantity is less than some degree (such as less than 20%), when load voltage is less than floating charge
During voltage, 51 single-chip microcomputer controls the battery charger 32 to be output as constant-current charge, when load voltage reaches float charge voltage
When automatically switch to constant-voltage charge, electricity stops charging after being full of, and can monitor battery electric quantity and temperature in real time in charging process
Degree；The rechargeable battery 31 is also that single-chip microcomputer main control unit 40 is powered in addition to being powered for the LED/light source 11, when not outer
Also LED normally operation long-time enough can be ensured when connecing alternating current.
According to different customer groups or practical scene, it is different amount of capacity that the rechargeable battery 31, which can be set,
Rechargeable battery, in some extreme environments, it is solar cell that can also set the rechargeable battery 31, by increasing solar energy
Collector plate removes original battery charger 32 and change proper circuit and just can realized.
In the present embodiment, the frequency adjustment unit 50 provided with adjusting knob 51 and be connected to the adjusting knob 51 with
Rotary encoder 52 between the single-chip microcomputer main control unit 40；Change the rotary coding by rotating the adjusting knob 51
The encoded radio of device 52 sets the different target glow frequency value K；The single-chip microcomputer main control unit 40 is provided with microcontroller 41,
51 single-chip microcomputers can be preferably used, internal clocking 411 are additionally provided with, the internal clocking 411 controls the target glow frequency value
K, actual glow frequency value K ' frequency triggering；The light sensor unit 60 is provided with light sensor 61, the light sensor
Device 61 gathers the intensity of illumination of the LED/light source 11, according to the irradiation time interval or fall time interval of the intensity of illumination,
Obtain the actual glow frequency value K '.
The frequency-tuning range for being above-mentioned adjusting knob 51 may be configured as 0.01~1000Hz, and the microcontroller 41 connects
The code conversion of the rotary encoder 52 is received into target glow frequency value K, then calculates described in the way of T=1/2K
The duration that LED/light source 11 is lighted and extinguished, the LED/light source 11 is controlled by the timing function of the internal clocking 411
The break-make of the part of shift knob 21 on power supply circuit, after the connected state of a T+t times, follows T+t time
Off-state, wherein t are the fine setting time, and the calculating of fine setting time t is first according to the luminous frequency of reality of the measurement of light sensor 61
Rate value K ' and target glow frequency value K deviation calculate obtained time deviation e, then according to control algolithm (such as PID increments
Type control algolithm) calculate fine setting time t:
T (k)=q0e (k)+q1e (k-1)+q2e (k-2)
Fine setting time when wherein t (k) is kth time measurement, e (k), e (k-1), e (k-2) are respectively kth time, kth -1
Time deviation during -2 measurements of secondary, kth, q0, q1, q2 are proportional integral derivative algorithm coefficient.
The closed-loop control of the light sensor 61, rotary encoder 52 and the single-chip microcomputer main control unit 40 that are fed back by above-mentioned band
Structure can accurately adjust the glow frequency of LED/light source 11 so that LED/light source 11 with accurate stable with target glow frequency value
KK carries out flashing.
In the present embodiment, the display unit 70 is provided with LCD display 71, except showing above-mentioned target glow frequency
Value K and actual glow frequency value K ' outside, are additionally operable to show the battery real time electrical quantity information that the single-chip microcomputer main control unit 40 is sent
And battery real time temperature information, it is easy to user to obtain relevant information in time, the design for both having met hommization in turn ensure that information
Publicity and validity, with vast application prospect.The LCD display 71 can select LCD1602 dot lcds and show
Screen, can show two rows, often 16 characters of row, screen size and indication range can meet display demand substantially.
It is a kind of structural representation for high-precision LED frequency modulation devices that the utility model embodiment is provided referring to Fig. 3.
In the present embodiment, the utility model provides a kind of high-precision LED frequency modulation lamp, provided with LED stocks 1, base 2 and connection
The support 3 of the base 2 and LED stocks 1；The base 2, support 3 and the mounted inside of LED stocks 1 have pcb board 4；The PCB
Plate 4 is provided with the LED luminescence units 10 corresponding with a kind of above-mentioned high-precision LED frequency modulation systems, single-chip microcomputer master control list
Member 40, light sensor unit 60, frequency adjustment unit 50, charging control unit 30, display unit 70 and switch switching unit
20。
Wherein, the support 3 is deformable support, and the surface of LED stocks 1, which is provided with, is fitted together to the LED luminescence units
The LED perforates 5 of 10 LED/light source 11；The surface of base 2 is provided with the battery charger for being fitted together to the charging control unit 30
32 electric wire perforate 6, the sensor aperture 7 of the light sensor 61 of the chimeric light sensor unit 60, the chimeric switch
The button perforate 8 of the shift knob 21 of switch unit 20, the knob for the adjusting knob 51 for being fitted together to the frequency adjustment unit 50 are opened
Hole 9, the LCD perforates 100 of the LCD display 71 of the chimeric display unit 70.
In this way, user is by need to only operate battery charger 32, the button and adjusting knob 51 just can realize user certainly
The target glow frequency value K of setting High Precision Automatic regulation.
Described above is preferred embodiment of the present utility model, it is noted that for the ordinary skill of the art
For personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and moistened
Decorations are also considered as protection domain of the present utility model.
Claims (9)
1. a kind of high-precision LED frequency modulation systems, provided with LED luminescence units, it is characterised in that the LED luminescence units connection
Switch switching unit and charging control unit, are additionally provided with single-chip microcomputer main control unit, are opened described in the single-chip microcomputer main control unit connection
Close switch unit, charging control unit, frequency adjustment unit, light sensor unit, display unit；
The switch switching unit is provided with switch module, and the LED is controlled by the Switch State Combination in Power Systems of the switch module
Luminescence unit on-off, restart, and display switch control signal is sent to the single-chip microcomputer main control unit；
The frequency adjustment unit is used to produce frequency adjusting signals, sets target glow frequency value；
The light sensor unit is used for the actual glow frequency value for measuring the LED luminescence units；
The single-chip microcomputer main control unit is used for the deviation according to actual glow frequency value and target the glow frequency value, using control
The actual glow frequency value of LED luminescence units is adjusted to reach target glow frequency value by algorithm processed；
The single-chip microcomputer main control unit is additionally operable to control the display unit to show according to the display switch control signal of reception
Show target glow frequency value and actual glow frequency value.
2. a kind of high-precision LED frequency modulation systems as claimed in claim 1, it is characterised in that：The LED luminescence units are provided with
LED/light source；The switch module of the switch switching unit includes at least one shift knob.
3. a kind of high-precision LED frequency modulation systems as claimed in claim 1, it is characterised in that：The charging control unit is set
There is rechargeable battery and be connected to the battery charger of the rechargeable battery positive and negative end and the single-chip microcomputer main control unit.
4. a kind of high-precision LED frequency modulation systems as claimed in claim 1, it is characterised in that：The frequency adjustment unit is set
The rotary encoder for having adjusting knob and being connected between the adjusting knob and the single-chip microcomputer main control unit；By rotating
The encoded radio for stating the adjusting knob change rotary encoder sets the different target glow frequency values.
5. a kind of high-precision LED frequency modulation systems as claimed in claim 1, it is characterised in that：The single-chip microcomputer main control unit
Provided with microcontroller and internal clocking, the internal clocking controls the target glow frequency value, the frequency of actual glow frequency value
Rate is triggered.
6. a kind of high-precision LED frequency modulation systems as claimed in claim 1 or 2, it is characterised in that：The light sensor unit
Provided with light sensor, the light sensor gathers the intensity of illumination of the LED/light source, according to the irradiation of the intensity of illumination
Time interval or fall time interval, obtain the actual glow frequency value.
7. a kind of high-precision LED frequency modulation systems as claimed in claim 1, it is characterised in that：The display unit is provided with LCD
Display screen, is additionally operable to show the battery real time electrical quantity information and battery real time temperature information that the single-chip microcomputer main control unit is sent.
8. a kind of high-precision LED frequency modulation lamp, it is characterised in that provided with LED stocks, base and the connection base and LED
The support of stock；The base, support and LED stock mounted insides have pcb board；The pcb board provided with LED luminescence units,
Single-chip microcomputer main control unit, light sensor unit, frequency adjustment unit, charging control unit, display unit and switch switching unit.
9. a kind of high-precision LED frequency modulation lamp as claimed in claim 8, it is characterised in that：The support is deformable support；
The LED stocks surface is provided with the LED perforates for the LED/light source for being fitted together to the LED luminescence units；The susceptor surface is provided with
It is fitted together to the electric wire perforate of the AC charger of the charging control unit, is fitted together to the light sensor of the light sensor unit
Sensor aperture, the button perforate of the shift knob of the chimeric switch switching unit, the tune for being fitted together to the frequency adjustment unit
Knob perforate, the LCD perforates for the LCD display for being fitted together to the display unit for saving knob.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720022519.9U CN206452574U (en) | 2017-01-09 | 2017-01-09 | A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps |
| PCT/CN2017/105210 WO2018126751A1 (en) | 2017-01-09 | 2017-10-01 | High-precision led frequency modulation system and led frequency modulation light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720022519.9U CN206452574U (en) | 2017-01-09 | 2017-01-09 | A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206452574U true CN206452574U (en) | 2017-08-29 |
Family
ID=59671413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720022519.9U Withdrawn - After Issue CN206452574U (en) | 2017-01-09 | 2017-01-09 | A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206452574U (en) |
| WO (1) | WO2018126751A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658859A (en) * | 2017-01-09 | 2017-05-10 | 万长林 | High-precision LED frequency modulation system and LED frequency modulation lamp |
| WO2018126751A1 (en) * | 2017-01-09 | 2018-07-12 | 万长林 | High-precision led frequency modulation system and led frequency modulation light |
| CN112087843A (en) * | 2019-06-13 | 2020-12-15 | 广州彩熠灯光股份有限公司 | Frequency-adjustable cannon signal board |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2289534B (en) * | 1994-05-17 | 1999-01-20 | Keith Darrell Knight | Video display measuring instrument |
| CN104254179B (en) * | 2014-09-03 | 2016-08-24 | 宁波欣达印刷机器有限公司 | A kind of control method of LED automatic synchronization strobe apparatus |
| TW201616921A (en) * | 2014-10-30 | 2016-05-01 | 金寶電子工業股份有限公司 | Light emitting device driving circuit and method thereof |
| CN206452574U (en) * | 2017-01-09 | 2017-08-29 | 万长林 | A kind of high-precision LED frequency modulation systems and LED frequency modulation lamps |
| CN106658859B (en) * | 2017-01-09 | 2019-01-01 | 万长林 | A kind of high-precision LED frequency modulation system and LED frequency modulation lamp |
-
2017
- 2017-01-09 CN CN201720022519.9U patent/CN206452574U/en not_active Withdrawn - After Issue
- 2017-10-01 WO PCT/CN2017/105210 patent/WO2018126751A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658859A (en) * | 2017-01-09 | 2017-05-10 | 万长林 | High-precision LED frequency modulation system and LED frequency modulation lamp |
| WO2018126751A1 (en) * | 2017-01-09 | 2018-07-12 | 万长林 | High-precision led frequency modulation system and led frequency modulation light |
| CN106658859B (en) * | 2017-01-09 | 2019-01-01 | 万长林 | A kind of high-precision LED frequency modulation system and LED frequency modulation lamp |
| CN112087843A (en) * | 2019-06-13 | 2020-12-15 | 广州彩熠灯光股份有限公司 | Frequency-adjustable cannon signal board |
| CN112087843B (en) * | 2019-06-13 | 2023-05-23 | 广州彩熠灯光股份有限公司 | Frequency-adjustable cannon signal board |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018126751A1 (en) | 2018-07-12 |
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