CN104981078A - LED music lamp based on Bluetooth control - Google Patents
LED music lamp based on Bluetooth control Download PDFInfo
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- CN104981078A CN104981078A CN201510434727.5A CN201510434727A CN104981078A CN 104981078 A CN104981078 A CN 104981078A CN 201510434727 A CN201510434727 A CN 201510434727A CN 104981078 A CN104981078 A CN 104981078A
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Abstract
The present invention discloses an LED music lamp based on Bluetooth control. The LED music lamp comprises an AC/DC conversion circuit, a Bluetooth music module, a DC/DC circuit, an LED load and a speaker. The AC/DC conversion circuit is directly connected to an LED load and supplies power to the LED load. The AC/DC conversion circuit, the DC/DC circuit and the Bluetooth music module are orderly connected in series and then are connected to the speaker. The Bluetooth music module is connected to the AC/DC conversion circuit which is connected to the speaker and supplies power to the speaker. According to the LED music lamp, the constant current function is realized by using an AC/DC circuit, the LED load can be powered, the small size of a PCB is ensured, the efficiency loss in the DC/DC circuit is avoided, the efficiency is improved, the heat radiation is facilitated, an expensive and large high voltage speaker power supply is not needed, the cost of the whole lamp is reduced, the volume is reduced, the LED music lamp is suitable for a small lamp, the output of overhigh voltage by the AC/DC conversion circuit is not needed, and the reliability of the Bluetooth music module is improved.
Description
Technical field
The invention belongs to field of power supplies, be specifically related to a kind of LED music lamp based on Bluetooth control.
Background technology
LED illumination has that energy-conservation, life-span is long, color rendering is good and the advantage such as fast response time, is therefore widely used in the life staying idle at home of people.People impel LED illumination technology to obtain development by leaps and bounds to the intelligentized demand of LED illumination.Occurred in the market can with mobile phone or remote controller by the LED lamp of Bluetooth control, there is the LED lamp of music playback function and the multifunctional lamp of other intelligentized control method.Therefore one of technology focus providing the driving power of power supply to become Intelligent LED lighting technology for this type of Intelligent LED lamp.
The existing LED music lamp driving power based on Bluetooth control mainly contains following two schemes:
(1) input AC electricity changes into constant voltage output, with the constant current of a DC/DC circuit realiration and dimming function, for LED load is powered by AC/DC change-over circuit; Another DC/DC circuit is the power speakers in Bluetooth music module and light fixture, and Bluetooth music module controls loud speaker sends music.The advantage of this scheme is that LED load and Bluetooth music module are special DC/DC scheme and power, Performance comparision is stablized, but DC/DC circuit is made up of IC chip, power inductance, Schottky diode and electrochemical capacitor etc. usually, use multiple DC/DC circuit cost higher, EMC (Electro Magnetic Compatibility) is poor, and pcb board size is comparatively large, is unfavorable for the popularization of small size Bluetooth music lamp.
(2) input AC electricity changes into constant voltage output by AC/DC change-over circuit, is directly power speakers, with the constant current of a DC/DC circuit realiration and dimming function, for LED load is powered; Bluetooth music module adopts LDO (low pressure difference linear voltage regulator) circuit supply.The advantage of this scheme is that it drives only with a DC/DC circuit, production cost is low, Electro Magnetic Compatibility is good, PCB size is less, but still there are some shortcomings in it: loud speaker will select the model of high input voltage, this kind of loud speaker volume is comparatively large, price is higher, so the overall cost advantage of light fixture is little.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of production cost low, good stability, the LED music lamp based on Bluetooth control that loud speaker volume is little.
Technical scheme of the present invention is achieved in that a kind of LED music lamp based on Bluetooth control, comprises AC/DC change-over circuit, Bluetooth music module, DC/DC circuit, LED load and loud speaker, wherein:
Described AC/DC change-over circuit is directly connected with LED load, for described LED load is powered;
Described AC/DC change-over circuit, DC/DC circuit are connected with described loud speaker after connecting successively with Bluetooth music module, and described Bluetooth music module plays music for controlling described loud speaker;
Described Bluetooth music module is connected with described AC/DC change-over circuit, for providing PWM dim signal for described AC/DC change-over circuit;
Described DC/DC circuit is directly connected with described loud speaker, is described power speakers.
Particularly, described AC/DC change-over circuit comprises input rectifying filter circuit, switch control rule IC1, power switch pipe Q1, transformer, constant current constant voltage IC2, photoelectrical coupler and secondary light adjusting circuit, described input rectifying filter circuit connecting valve control IC1, described switch control rule IC1 controls power switch pipe Q1, described power switch pipe Q1 connects the primary coil of described transformer, and the ancillary coil of described transformer connects described switch control rule IC1; The secondary coil of described transformer connects described constant current constant voltage IC2, and output voltage and the output voltage of described constant current constant voltage IC2 of the secondary coil of described transformer are connected two inputs of described photoelectrical coupler respectively; The output of described photoelectrical coupler connects described switch control rule IC1; The secondary coil of described transformer connects described secondary light adjusting circuit.
Further, described input rectifying filter circuit exports the VDD pin by resistance R4, R5 connecting valve control IC1, the SENSE pin of described switch control rule IC1 is by the first sampling resistor ground connection, first sampling resistor comprises resistance RS1, RS2 of being connected in parallel, and the RT pin of described switch control rule IC1 is by resistance R10 ground connection; The GATE pin of described switch control rule IC1 connects the grid of power switch pipe Q1 by resistance R7, described power switch pipe Q1 drain electrode connection transformer primary coil, and source electrode is by the first sampling resistor ground connection; Described transformer ancillary coil is by the VDD pin of diode D2, resistance R6 connecting valve control IC1.
Further, the secondary coil of described transformer after rectifier diode D3 and filter capacitor EC3, output voltage VO UT; Described voltage VOUT is connected to the VCC pin of described constant current constant voltage IC2, and described voltage VOUT is also connected with the input anode of described photoelectrical coupler and the second sampling resistor; Described second sampling resistor comprises resistance R11, R12, R13, and described resistance R11 and R12 is connected in parallel, resistance R11 and the R12 mono-termination voltage VOUT after parallel connection, other end contact resistance R13, and the described R13 other end connects output earth terminal; Described resistance R12 is connected with the VCTRL pin of described constant current constant voltage IC2 with the link node of resistance R13; The ICTRL pin contact resistance R24 again of described constant current constant voltage IC2, and the other end of resistance R24 connects output earth terminal; The VSENSE pin of described constant current constant voltage IC2 connects the 3rd sampling resistor by resistance R25; Described 3rd sampling resistor comprises resistance R21 and R22 in parallel, and the other end of described 3rd sampling resistor connects output earth terminal; The VOUT pin of described constant current constant voltage IC2 connects the input negative electrode of photoelectrical coupler, the FB pin of the output connecting valve control IC1 of described photoelectrical coupler.
Particularly, described secondary light adjusting circuit comprises resistance R14, R15, R16, R17, R19, R20 and switching tube Q2, Q3, and after described resistance R14 and R15 connects, one end connects Bluetooth music module, receives PWM dim signal, and other end connection exports earth terminal; Described resistance R14 and R15 dividing potential drop, the tie point of described resistance R14 and R15 is connected with the grid of described switching tube Q2; Described resistance R16, R17 are connected in series, one end of described voltage VOUT contact resistance R16, the drain electrode of the other end connecting valve pipe Q2 of resistance R17, and the source electrode of switching tube Q2 connects output earth terminal; Described resistance R16, R17 dividing potential drop tie point is connected with the grid of described switching tube Q3; The source electrode of described switching tube Q3 connects voltage VOUT, drains and is connected the positive pole of LED load by the resistance R19,20 of parallel connection; The negative pole of described LED load connects output earth terminal by described 3rd sampling resistor;
Further, described secondary light adjusting circuit also comprises the short-circuit protection circuit be made up of resistance R18 and diode D4, prevents the work affecting Bluetooth music module during LED load short circuit.
Further, described DC/DC circuit comprises DC/DC control IC3, resistance R29, R30, R31, R32, R33, R34, electric capacity C11, C12, C13 and inductance L 2, the IN pin of described DC/DC control IC3 connects voltage VOUT, described voltage VOUT connects the EN pin of DC/DC control IC3 by resistance R29, and the IN pin of described DC/DC control IC3 connects output earth terminal by electric capacity C9; The BST pin contact resistance R31 of described DC/DC control IC3, described resistance R31 connects electric capacity C12, and the other end of described electric capacity C12 connects the SW pin of DC/DC control IC3.
Particularly, described resistance R30 and electric capacity C11 is connected in parallel, R30 with C11 one end after parallel connection is connected output earth terminal, the other end connects the AAM pin of DC/DC control IC3, the SW pin of described DC/DC control IC3 connects inductance L 2 rear output 5V voltage, for giving described Bluetooth music module and power speakers.
Further, described resistance R33 and resistance R34 is connected in series, and the tie point of the two connects the FB pin of DC/DC control IC3 by described resistance R32; Described electric capacity C13 is connected in parallel on the two ends of described resistance R33.
Compared with prior art, the present invention has following beneficial effect:
1, adopt AC/DC change-over circuit under the prerequisite realizing voltage transitions, constant voltage, the precise constant also achieving electric current controls, PWM light modulation is realized by switching tube, can directly for LED load be powered, save the DC-DC circuit of LED load, ensure that PCB size is less, also eliminate the loss of efficiency on DC/DC circuit, efficiency raises, good heat dissipation effect; Do not need, with expensive and bulky high pressure power speakers, to reduce whole lamp cost, reduce volume, be applicable to small size light fixture.
2, DC/DC circuit is used to power for LED load in traditional scheme, so just need the output voltage of the AC/DC change-over circuit be connected with described DC/DC circuit than LED lamp bead pressure drop height about the 3V in LED load, the DC/DC IC circuit of such Bluetooth music module for power supply will bear higher voltage stress, and in the present invention, adopt AC/DC circuit realiration constant current function, directly for LED load is powered, therefore do not need AC/DC change-over circuit to export too high voltage, improve the reliability of Bluetooth music module.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of a kind of LED music lamp based on Bluetooth control of the present invention;
Fig. 2 is that the present invention is a kind of based on AC/DC change-over circuit schematic diagram in the LED music lamp of Bluetooth control;
Fig. 3 is that the present invention is a kind of based on DC/DC circuit theory diagrams in the LED music lamp of Bluetooth control.
Embodiment
By reference to the accompanying drawings the present invention is described further.
As shown in Figure 1, a kind of LED music lamp based on Bluetooth control, comprises AC/DC change-over circuit, Bluetooth music module, DC/DC circuit, LED load and loud speaker, wherein:
Described AC/DC change-over circuit is directly connected with LED load, for described LED load is powered;
Described AC/DC change-over circuit, DC/DC circuit are connected with described loud speaker after connecting successively with Bluetooth music module, and described Bluetooth music module plays music for controlling described loud speaker;
Described Bluetooth music module is connected with described AC/DC change-over circuit, for providing PWM dim signal for described AC/DC change-over circuit;
Described DC/DC circuit is directly connected with described loud speaker, is described power speakers.
Particularly, as shown in Figure 2, described AC/DC change-over circuit comprises input rectifying filter circuit, switch control rule IC1, power switch pipe Q1, transformer, constant current constant voltage IC2, photoelectrical coupler and secondary light adjusting circuit, described input rectifying filter circuit connecting valve control IC1, described switch control rule IC1 controls power switch pipe Q1, described power switch pipe Q1 connects the primary coil of described transformer, and the ancillary coil of described transformer connects described switch control rule IC1; The secondary coil of described transformer connects described constant current constant voltage IC2, and output voltage and the output voltage of described constant current constant voltage IC2 of the secondary coil of described transformer are connected two inputs of described photoelectrical coupler respectively; The output of described photoelectrical coupler connects described switch control rule IC1; The secondary coil of described transformer connects described secondary light adjusting circuit.
Described input rectifying filter circuit exports the VDD pin by resistance R4, R5 connecting valve control IC1, the SENSE pin of described switch control rule IC1 is by the first sampling resistor ground connection, first sampling resistor comprises resistance RS1, RS2 of being connected in parallel, and the RT pin of described switch control rule IC1 is by resistance R10 ground connection.The GATE pin of described switch control rule IC1 connects the grid of power switch pipe Q1 by resistance R7, described power switch pipe Q1 drain electrode connection transformer primary coil, source electrode is by ground connection after the first sampling resistor.Described transformer ancillary coil is by the VDD pin of diode D2, resistance R6 connecting valve control IC1.
Further, the secondary coil of described transformer after rectifier diode D3 and filter capacitor EC3, output voltage VO UT; Described voltage VOUT is connected to the VCC pin of described constant current constant voltage IC2, and described voltage VOUT is also connected with the input anode of described photoelectrical coupler and the second sampling resistor; Described second sampling resistor comprises resistance R11, R12, R13, and described resistance R11 and R12 is connected in parallel, resistance R11 and the R12 mono-termination voltage VOUT after parallel connection, other end contact resistance R13, and the described R13 other end connects output earth terminal; Described resistance R12 is connected with the VCTRL pin of described constant current constant voltage IC2 with the link node place of resistance R13; The ICTRL pin contact resistance R24 again of described constant current constant voltage IC2, and the other end of resistance R24 connects output earth terminal; The VSENSE pin of described constant current constant voltage IC2 connects the 3rd sampling resistor by resistance R25; Described 3rd sampling resistor comprises resistance R21 and R22 in parallel, and the other end of described 3rd sampling resistor connects output earth terminal; The VOUT pin of described constant current constant voltage IC2 connects the input negative electrode of photoelectrical coupler, the FB pin of the output connecting valve control IC1 of described photoelectrical coupler.
In addition, described secondary light adjusting circuit comprises resistance R14, R15, R16, R17, R19, R20 and switching tube Q2, Q3, and after described resistance R14 and R15 connects, one end connects Bluetooth music module, receives PWM dim signal, and other end connection exports earth terminal; Described resistance R14 and R15 dividing potential drop, the tie point of described resistance R14 and R15 is connected with the grid of described switching tube Q2; Described resistance R16, R17 are connected in series, one end of described voltage VOUT contact resistance R16, the drain electrode of the other end connecting valve pipe Q2 of resistance R17, and the source electrode of switching tube Q2 connects output earth terminal; Described resistance R16, R17 dividing potential drop tie point is connected with the grid of described switching tube Q3; The source electrode of described switching tube Q3 connects voltage VOUT, drains and is connected the positive pole of LED load by the resistance R19,20 of parallel connection; The negative pole of described LED load connects output earth terminal by described 3rd sampling resistor.Described secondary light adjusting circuit also comprises the short-circuit protection circuit be made up of resistance R18 and diode D4, prevents the work affecting Bluetooth music module during LED load short circuit.
As shown in Figure 3, described DC/DC circuit comprises DC/DC control IC3, resistance R29, R30, R31, R32, R33, R34, electric capacity C11, C12, C13 and inductance L 2, the IN pin of described DC/DC control IC3 connects voltage VOUT, described voltage VOUT connects the EN pin of DC/DC control IC3 by resistance R29, and the IN pin of described DC/DC control IC3 connects output earth terminal by electric capacity C9; The BST pin contact resistance R31 of described DC/DC control IC3, described resistance R31 connects electric capacity C12, and the other end of described electric capacity C12 connects the SW pin of DC/DC control IC3.Described resistance R30 and electric capacity C11 is connected in parallel, R30 with C11 one end after parallel connection is connected output earth terminal, the other end connects the AAM pin of DC/DC control IC3, and the SW pin of described DC/DC control IC3 connects inductance L 2 rear output 5V voltage, for giving described Bluetooth music module and power speakers.Described resistance R33 and resistance R34 is connected in series, and the tie point of the two connects the FB pin of DC/DC control IC3 by described resistance R32; Described electric capacity C13 is connected in parallel on the two ends of described resistance R33.
The present invention has following beneficial effect:
1, adopt AC/DC change-over circuit under the prerequisite realizing voltage transitions, constant voltage, the precise constant also achieving electric current controls, switch dimming is realized by switching tube, can directly for LED load be powered, save the DC-DC circuit of LED load, ensure that PCB size is less, also eliminate the loss of efficiency on DC/DC circuit, efficiency raises, good heat dissipation effect; Do not need, with expensive and bulky high pressure power speakers, to reduce whole lamp cost, reduce volume, be applicable to small size light fixture.
2, DC/DC circuit is used to power for LED load in traditional scheme, so just need the output voltage of the AC/DC change-over circuit be connected with described DC/DC circuit than LED lamp bead pressure drop height about the 3V in LED load, the DC/DC IC circuit of such Bluetooth music module for power supply will bear higher voltage stress, and in the present invention, adopt AC/DC circuit realiration constant current function, directly for LED load is powered, therefore do not need AC/DC change-over circuit to export too high voltage, improve the reliability of Bluetooth music module.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change above-mentioned execution mode and revise.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (9)
1. based on a LED music lamp for Bluetooth control, it is characterized in that, comprise AC/DC change-over circuit, Bluetooth music module, DC/DC circuit, LED load and loud speaker, wherein:
Described AC/DC change-over circuit is directly connected with described LED load, for described LED load is powered;
Described AC/DC change-over circuit, DC/DC circuit are connected with described loud speaker after connecting successively with Bluetooth music module, and described Bluetooth music module plays music for controlling described loud speaker;
Described Bluetooth music module is connected with described AC/DC change-over circuit, for providing PWM dim signal for described AC/DC change-over circuit;
Described DC/DC circuit is directly connected with described loud speaker, is described power speakers.
2. a kind of LED music lamp based on Bluetooth control as claimed in claim 1, it is characterized in that, described AC/DC change-over circuit comprises input rectifying filter circuit, switch control rule IC1, power switch pipe Q1, transformer, constant current constant voltage IC2, photoelectrical coupler and secondary light adjusting circuit, described input rectifying filter circuit connects described switch control rule IC1, described switch control rule IC1 controls power switch pipe Q1, described power switch pipe Q1 connects the primary coil of described transformer, and the ancillary coil of transformer connects described switch control rule IC1; The secondary coil of described transformer connects described constant current constant voltage IC2, and the secondary coil of described transformer is by being connected the input of described photoelectrical coupler respectively with the output of described constant current constant voltage IC2 after rectifying and wave-filtering; The output of described photoelectrical coupler connects described switch control rule IC1; The secondary coil of described transformer connects described secondary light adjusting circuit.
3. a kind of LED music lamp based on Bluetooth control as claimed in claim 2, it is characterized in that, described input rectifying filter circuit output is by the VDD pin of resistance R4, R5 connecting valve control IC1, the SENSE pin of described switch control rule IC1 is by the first sampling resistor RS ground connection, and the RT pin of described switch control rule IC1 is by resistance R10 ground connection; The GATE pin of described switch control rule IC1 connects the grid of described power switch pipe Q1 by resistance R7, described power switch pipe Q1 drain electrode connection transformer primary coil, and source electrode is by the first sampling resistor RS ground connection; Described transformer ancillary coil connects the VDD pin of described switch control rule IC1 by diode D2, resistance R6.
4. a kind of LED music lamp based on Bluetooth control as claimed in claim 2, is characterized in that, the secondary coil of described transformer after rectifier diode D3 and filter capacitor EC3, output voltage VO UT; Described voltage VOUT is connected to the VCC pin of described constant current constant voltage IC2, and input anode and second sampling resistor of described voltage VOUT and described photoelectrical coupler are connected; Described second sampling resistor comprises resistance R11, R12, R13, and described resistance R11 and R12 is connected in parallel, resistance R11 and the R12 mono-termination voltage VOUT after parallel connection, other end contact resistance R13, and the described resistance R13 other end connects output earth terminal; Described resistance R12 is connected with the VCTRL pin of described constant current constant voltage IC2 with the link node place of resistance R13; The other end of the ICTRL pin contact resistance R24 of described constant current constant voltage IC2, described resistance R24 connects output earth terminal; The VSENSE pin of described constant current constant voltage IC2 connects the 3rd sampling resistor by resistance R25; Described 3rd sampling resistor comprises resistance R21 and R22 in parallel, and the other end of described 3rd sampling resistor connects output earth terminal; The VOUT pin of described constant current constant voltage IC2 connects the input negative electrode of described photoelectrical coupler, the FB pin of the output connecting valve control IC1 of described photoelectrical coupler.
5. a kind of LED music lamp based on Bluetooth control as claimed in claim 2, it is characterized in that, described secondary light adjusting circuit comprises resistance R14, R15, R16, R17, R19, R20 and switching tube Q2, Q3, after described resistance R14 and R15 connects, one end connects Bluetooth music module, receive PWM dim signal, the other end connects output earth terminal; Described resistance R14 and R15 dividing potential drop, the tie point of described resistance R14 and R15 is connected with the grid of described switching tube Q2; Described resistance R16 and resistance R17 is connected in series, one end of described voltage VOUT contact resistance R16, and the other end of resistance R17 connects the drain electrode of described switching tube Q2, and the source electrode of described switching tube Q2 connects output earth terminal; Described resistance R16, R17 dividing potential drop tie point is connected with the grid of described switching tube Q3; The source electrode of described switching tube Q3 connects VOUT, drains and is connected the positive pole of LED load by resistance R19, R20 of parallel connection; The negative pole of described LED load connects output earth terminal by the 3rd sampling resistor.
6. a kind of LED music lamp based on Bluetooth control as claimed in claim 2; it is characterized in that; described secondary light adjusting circuit also comprises the short-circuit protection circuit that resistance R18 and diode D4 forms, for preventing the work affecting Bluetooth music module during LED load short circuit.
7. a kind of LED music lamp based on Bluetooth control as claimed in claim 1, it is characterized in that, described DC/DC circuit comprises DC/DC control IC3, resistance R29, R30, R31, R32, R33, R34, electric capacity C11, C12, C13 and inductance L 2, the IN pin of described DC/DC control IC3 connects voltage VOUT, and described voltage VOUT connects the EN pin of described DC/DC control IC3 by resistance R29, and the IN pin of described DC/DC control IC3 connects output earth terminal by electric capacity C9; The BST pin of described DC/DC control IC3 connects described resistance R31, and described resistance R31 connects electric capacity C12, and the other end of described electric capacity C12 connects the SW pin of DC/DC control IC3.
8. a kind of LED music lamp based on Bluetooth control as claimed in claim 7, it is characterized in that, described resistance R30 and electric capacity C11 is connected in parallel, R30 with C11 one end after parallel connection is connected output earth terminal, the other end connects the AAM pin of described DC/DC control IC3, exports to described Bluetooth music module and power speakers after the SW pin connection inductance L 2 of described DC/DC control IC3.
9. a kind of LED music lamp based on Bluetooth control as claimed in claim 7, it is characterized in that, described resistance R33 and resistance R34 is connected in series, and the tie point of the two connects the FB pin of described DC/DC control IC3 by described resistance R32; Described electric capacity C13 is connected in parallel on the two ends of described resistance R33.
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| CN201510434727.5A CN104981078B (en) | 2015-07-22 | 2015-07-22 | A kind of LED music lamps based on Bluetooth control |
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| CN201510434727.5A CN104981078B (en) | 2015-07-22 | 2015-07-22 | A kind of LED music lamps based on Bluetooth control |
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| CN104981078B CN104981078B (en) | 2017-11-17 |
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| CN106655776A (en) * | 2017-01-16 | 2017-05-10 | 深圳市华星光电技术有限公司 | Voltage conversion device |
| CN107770923A (en) * | 2017-10-25 | 2018-03-06 | 佛山市威得士灯饰电器有限公司 | The method of supplying power to of light fixture and its circuit unit and light fixture |
| CN111601421A (en) * | 2020-05-26 | 2020-08-28 | 深圳市南科信息科技有限公司 | Visible light communication LED lamp and system regulated and controlled through Bluetooth |
| CN112822821A (en) * | 2019-11-15 | 2021-05-18 | 肯舒摩照明（美国）有限责任公司 | Circuit unit for lamp and lamp comprising same |
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| Publication number | Publication date |
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| CN104981078B (en) | 2017-11-17 |
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Denomination of invention: A kind of LED music lamp based on Bluetooth control Effective date of registration: 20201214 Granted publication date: 20171117 Pledgee: Shunde Guangdong rural commercial bank Limited by Share Ltd. Daliang branch Pledgor: FOSHAN TOPDAY OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: Y2020980009231 |
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Denomination of invention: Led music lamp based on Bluetooth control Effective date of registration: 20211220 Granted publication date: 20171117 Pledgee: Guangdong Shunde Rural Commercial Bank Co.,Ltd. science and technology innovation sub branch Pledgor: FOSHAN TOPDAY OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Registration number: Y2021980015722 |
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