CN103281836A - Chip over-temperature protection circuit applied to alternative current LED drive system - Google Patents
Chip over-temperature protection circuit applied to alternative current LED drive system Download PDFInfo
- Publication number
- CN103281836A CN103281836A CN2013102224996A CN201310222499A CN103281836A CN 103281836 A CN103281836 A CN 103281836A CN 2013102224996 A CN2013102224996 A CN 2013102224996A CN 201310222499 A CN201310222499 A CN 201310222499A CN 103281836 A CN103281836 A CN 103281836A
- Authority
- CN
- China
- Prior art keywords
- temperature
- module
- chip
- current control
- constant current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a chip over-temperature protection circuit applied to an alternative current LED drive system. The chip over-temperature protection circuit comprises a temperature sensing diode, a temperature setting module, a oblique wave voltage module, a reference voltage generating module and a constant-current control module. In the time of work, when the temperature setting module and the oblique wave voltage module detect the temperature of a chip to be larger than a protection temperature through the temperature sensing diode, the temperature setting module and the oblique wave voltage module generate corresponding signals, the signals are chosen and combined through an adder and reference voltage generated by the reference voltage generating module and then input to the constant-current control module. The constant-current control module controls a current flowing through an LED in a lamp to be reduced, the temperature of the chip can be reduced, and therefore negative feedback exists between the temperature of the chip and the current. If the lamp does not dissipate heat well, when the current is reduced to reach a certain value, a heating amount of the chip is equal to a heat dissipation amount, balance is achieved, therefore the lamp is prevented from being turned off, and the problem of circulating turn-on and turn-off is avoided and stability of the system is not affected.
Description
Technical field
The present invention relates to LED drive system technical field, relate in particular to a kind of chip thermal-shutdown circuit that is applied in the AC LED drive system.
Background technology
LED(Light Emitting Diode, light-emitting diode) is to adopt semi-conducting material as the light source of new generation of electrical-optical transfer medium, has characteristics such as energy-saving and environmental protection, the life-span is long, volume is little, will become the main flow illumination substituting electricity-saving lamp soon.Along with global incandescent lamp cut-off taboo pin policy is implemented in regular turn, the LED lighting will be in the face of replacing the opportunity of incandescent lamp, and market scale is up to hundreds billion of.
The existing AC LED drive system that is applied in the LED lighting, when chip (led chip of the LED in the light fixture) heating caused temperature too high, the mode of its overheat protector generally was direct powered-down, recovered after waiting chip temperature to reduce again.But if it is bad to dispel the heat, switch periodic duty problem (close behind the temperature height, close back temperature decline and open again) may appear in this protected mode, and system's instability causes light flash.
Summary of the invention
The objective of the invention is to provide at the deficiencies in the prior art a kind of avoids the switch circulatory problems occurring and influences the chip thermal-shutdown circuit in the AC LED drive system of being applied in of system stability.
To achieve these goals, the invention provides a kind of chip thermal-shutdown circuit that is applied in the AC LED drive system, comprise temperature-sensitive diode, temperature setting module, ramp voltage module, reference voltage generation module, constant current control module; The temperature-sensitive diode is for detection of the temperature of chip, the temperature setting module is used for setting the protection temperature that needs, the ramp voltage module is used for the voltage of temperature-sensitive diode is proofreaied and correct again, the reference voltage generation module is for generation of a fixing reference voltage, and the electric current that the constant current control module flows through the LED of light fixture for control is constant current; The positive pole of temperature-sensitive diode is connected the minus earth of temperature-sensitive diode with the input of first power supply, temperature setting module, the input of ramp voltage module; The output of first output of temperature setting module, the output of ramp voltage module and reference voltage generation module is connected by the input of adder with the constant current control module; When temperature setting module and ramp voltage module by the temperature-sensitive diode detection to the temperature of chip during greater than the protection temperature; after temperature setting module, ramp voltage module all can produce corresponding signal and select combination by the reference voltage that adder and reference voltage produce; input to the constant current control module; the electric current that is flow through the LED in the light fixture by the control of constant current control module reduces, and the temperature of chip is reduced.
Preferably, described constant current control module comprises operational amplifier U1, metal-oxide-semiconductor Q1, resistance R s, the in-phase input end of operational amplifier U1 is the input of described constant current control module, the output of operational amplifier U1 is connected with the grid of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 is connected with LED in the light fixture, the inverting input of the source electrode of metal-oxide-semiconductor Q1, operational amplifier U1 all is connected with the end of resistance R s, the other end ground connection of resistance R s.
Preferably; described temperature setting module also is used for setting the shutoff temperature; turn-off temperature greater than the protection temperature; second output of temperature setting module is connected with the Enable Pin of operational amplifier U1; when the temperature setting module by the temperature-sensitive diode detection to the temperature of chip when turn-offing temperature; second output of temperature setting module produces an enable signal to the Enable Pin of operational amplifier U1, and described constant current control module is closed.
Beneficial effect of the present invention is: the present invention is applied in the chip thermal-shutdown circuit in the AC LED drive system, and when work, when the temperature of chip was less than or equal to the protection temperature, the constant current control module was according to the LED in the normal setting driving light fixture; When temperature setting module and ramp voltage module by the temperature-sensitive diode detection to the temperature of chip during greater than the protection temperature; the temperature setting module; after the ramp voltage module all can produce corresponding signal and select combination by the reference voltage that adder and reference voltage produce; input to the constant current control module; the electric current that is flow through the LED in the light fixture by the control of constant current control module reduces; the temperature of chip is reduced; thereby make between the temperature of chip and the electric current and have negative feedback; if the poor heat radiation of light fixture; make chip heating balance occur after equating and be unlikely to close light fixture with dispelling the heat when electric current is reduced to certain value, can avoid the switch circulatory problems occurring and influence system stability.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is voltage and the variation of temperature curve synoptic diagram of ramp voltage module of the present invention.
Fig. 3 is the voltage of in-phase input end of operational amplifier U1 of the present invention and the change curve schematic diagram of chip temperature.
Fig. 4 is the electric current of the LED in the light fixture and the change curve schematic diagram of chip temperature of flowing through of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Please refer to Fig. 1, the present invention is applied in the chip thermal-shutdown circuit in the AC LED drive system, and it comprises temperature-sensitive diode 6(Thermo Diode), temperature setting module 1, ramp voltage module 2, reference voltage generation module 3, constant current control module 4; Temperature-sensitive diode 6 is for detection of the temperature of chip (for example: temperature-sensitive diode 6 is positioned near the chip), and temperature setting module 1 is used for setting the protection temperature that needs; Ramp voltage module 2 is used for the voltage of temperature-sensitive diode 6 is proofreaied and correct again, and the voltage that obtains (V) has negative correlation (as shown in Figure 2) preferably with temperature (T); Reference voltage generation module 3 is for generation of a fixing reference voltage (Vref), and the electric current that constant current control module 4 flows through the LED5 of light fixture for control is constant current; The positive pole of temperature-sensitive diode 6 is connected the minus earth of temperature-sensitive diode 6 (GND) with the input of first power supply (VDD), temperature setting module 1, the input of ramp voltage module 2; The output of first output of temperature setting module 1, the output of ramp voltage module 2 and reference voltage generation module 3 is connected by the input of adder 7 with constant current control module 4; The temperature that detects chip by temperature-sensitive diode 6 when temperature setting module 1 and ramp voltage module 2 is during greater than the protection temperature; after temperature setting module 1, ramp voltage module 2 all can produce corresponding signal and select combination by the reference voltage that adder 7 and reference voltage produce; draw the voltage waveform of the curve of the rated current of the LED5 in the light fixture and temperature relation; input to constant current control module 4 then; the electric current that is flow through the LED5 in the light fixture by 4 controls of constant current control module reduces, and the temperature of chip is reduced.
As preferably; described constant current control module 4 comprises operational amplifier U1; metal-oxide-semiconductor Q1; resistance R s; the in-phase input end of operational amplifier U1 is the input of described constant current control module 4; the output of operational amplifier U1 is connected with the grid of metal-oxide-semiconductor Q1; the drain electrode of metal-oxide-semiconductor Q1 is connected with LED5 in the light fixture; the source electrode of metal-oxide-semiconductor Q1; the inverting input of operational amplifier U1 all is connected with the end of resistance R s; the other end ground connection of resistance R s; the voltage of supposing the in-phase input end of operational amplifier U1 is Vp; the electric current that then flows through the LED5 in the light fixture is Vp/Rs; suppose that the protection temperature is T1, then the variation relation of Vp and T1 as shown in Figure 3.
Further; described temperature setting module 1 also is used for setting the shutoff temperature; turn-off temperature greater than the protection temperature; second output of temperature setting module 1 is connected with the Enable Pin of operational amplifier U1; the temperature that detects chip by temperature-sensitive diode 6 when temperature setting module 1 is when turn-offing temperature; second output of temperature setting module 1 produces an enable signal to the Enable Pin (EN) of operational amplifier U1, and described constant current control module 4 is closed.
Wherein, LED5 in the described light fixture can form for one or more LED, be to connect anodal mode by a plurality of LED according to negative pole to be composed in series successively as the LED5 in the light fixture in the present embodiment, the anodal termination second source (Vcc) after these a plurality of LED series connection, the drain electrode of negative pole termination metal-oxide-semiconductor Q1.Certainly, the LED5 in the light fixture in the present embodiment comprises led chip, and this led chip is the chip that the application needs overheat protector.Wherein, be connected with ammeter between the positive pole of temperature-sensitive diode 6 and first power supply, to observe electric current.
Wherein, temperature setting module 1 of the present invention can be realized the setting of protection temperature and shutoff temperature by two comparators; for example: the in-phase input end of two comparators all is connected with the positive pole of temperature-sensitive diode 6; the inverting input of two comparators is then imported fixed reference potential; the output of importing the comparator of the reference voltage of realizing the protection temperature is first output, and the output of the comparator of the reference voltage of input realization shutoff temperature is second output.
Operation principle of the present invention: as shown in Figure 4, the electric current of supposing to flow through the LED5 in the light fixture is that I, temperature setting module 1 setting protection temperature are that T1, shutoff temperature are T2, when work, when chip temperature is less than or equal to T1, constant current control module 4 is according to the LED5 in the normal setting driving light fixture, and electric current I is constant; After temperature surpassed T1, electric current I raise with temperature and reduces; Such benefit is: has negative feedback between temperature and the electric current, if poor heat radiation makes chip heating balance occur after equating and be unlikely to close light fixture with dispelling the heat when electric current is reduced to certain value, avoids occurring the switch circulatory problems, and can light flash yet.Suppose to exist abnormal conditions that chip temperature is raise always, reach T2 after, constant current control module 4 is closed, and light fixture is closed, thereby makes circuit realize the function of duplicate protection.
Therefore; the present invention is applied in the chip thermal-shutdown circuit in the AC LED drive system; set suitable protection temperature T 1, turn-off temperature T 2 by temperature setting module 1, and set suitable voltage slope by ramp voltage module 2, can obtain the drive current of the LED5 in the suitable light fixture.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done to explain; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (3)
1. a chip thermal-shutdown circuit that is applied in the AC LED drive system is characterized in that: comprise temperature-sensitive diode, temperature setting module, ramp voltage module, reference voltage generation module, constant current control module; The temperature-sensitive diode is for detection of the temperature of chip, the temperature setting module is used for setting the protection temperature that needs, the ramp voltage module is used for the voltage of temperature-sensitive diode is proofreaied and correct again, the reference voltage generation module is for generation of a fixing reference voltage, and the electric current that the constant current control module flows through the LED of light fixture for control is constant current; The positive pole of temperature-sensitive diode is connected the minus earth of temperature-sensitive diode with the input of first power supply, temperature setting module, the input of ramp voltage module; The output of first output of temperature setting module, the output of ramp voltage module and reference voltage generation module is connected by the input of adder with the constant current control module; When temperature setting module and ramp voltage module by the temperature-sensitive diode detection to the temperature of chip during greater than the protection temperature; after temperature setting module, ramp voltage module all can produce corresponding signal and select combination by the reference voltage that adder and reference voltage produce; input to the constant current control module; the electric current that is flow through the LED in the light fixture by the control of constant current control module reduces, and the temperature of chip is reduced.
2. the chip thermal-shutdown circuit that is applied in the AC LED drive system according to claim 1; it is characterized in that: described constant current control module comprises operational amplifier U1, metal-oxide-semiconductor Q1, resistance R s; the in-phase input end of operational amplifier U1 is the input of described constant current control module; the output of operational amplifier U1 is connected with the grid of metal-oxide-semiconductor Q1; the drain electrode of metal-oxide-semiconductor Q1 is connected with LED in the light fixture; the inverting input of the source electrode of metal-oxide-semiconductor Q1, operational amplifier U1 all is connected with the end of resistance R s, the other end ground connection of resistance R s.
3. the chip thermal-shutdown circuit that is applied in the AC LED drive system according to claim 2; it is characterized in that: described temperature setting module also is used for setting the shutoff temperature; turn-off temperature greater than the protection temperature; second output of temperature setting module is connected with the Enable Pin of operational amplifier U1; when the temperature setting module by the temperature-sensitive diode detection to the temperature of chip when turn-offing temperature; second output of temperature setting module produces an enable signal to the Enable Pin of operational amplifier U1, and described constant current control module is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310222499.6A CN103281836B (en) | 2013-06-06 | 2013-06-06 | Chip over-temperature protection circuit applied to alternative current LED drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310222499.6A CN103281836B (en) | 2013-06-06 | 2013-06-06 | Chip over-temperature protection circuit applied to alternative current LED drive system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103281836A true CN103281836A (en) | 2013-09-04 |
| CN103281836B CN103281836B (en) | 2015-04-01 |
Family
ID=49064232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310222499.6A Active CN103281836B (en) | 2013-06-06 | 2013-06-06 | Chip over-temperature protection circuit applied to alternative current LED drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103281836B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103747587A (en) * | 2014-01-15 | 2014-04-23 | 西北工业大学 | LED (Light Emitting Diode) lamp radiator temperature online self-adaptation control circuit and method |
| CN104010424A (en) * | 2014-06-17 | 2014-08-27 | 电子科技大学 | Temperature compensating circuit for linearly driving LED |
| WO2015042991A1 (en) * | 2013-09-29 | 2015-04-02 | 深圳市华星光电技术有限公司 | Led backlight driving circuit and liquid crystal display apparatus |
| CN105682280A (en) * | 2014-12-08 | 2016-06-15 | 锋翔科技公司 | Automatic power controller |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN110320952A (en) * | 2019-07-22 | 2019-10-11 | 苏州欧普照明有限公司 | A kind of thermal-shutdown circuit and system |
| CN112235895A (en) * | 2020-09-10 | 2021-01-15 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit and driving power supply |
| CN112803237A (en) * | 2021-04-08 | 2021-05-14 | 安菲腾(常州)光电科技有限公司 | High-efficiency wide-working-voltage semiconductor laser constant-current driving circuit |
| WO2022083203A1 (en) * | 2020-10-20 | 2022-04-28 | 深圳市晟碟半导体有限公司 | Led drive circuit and led drive chip for eliminating cob encapsulation photoelectric effect |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868087A (en) * | 2010-05-27 | 2010-10-20 | 上海北京大学微电子研究院 | Light-emitting diode (LED) driving chip and LED circuit |
| US20120249516A1 (en) * | 2011-04-01 | 2012-10-04 | Emagin Corporation | Amoled microdisplay device with active temperature control |
| CN102869155A (en) * | 2012-09-06 | 2013-01-09 | 上海晶丰明源半导体有限公司 | LED (light-emitting diode) driving source control circuit and control method thereof |
| CN202773126U (en) * | 2012-07-02 | 2013-03-06 | 欧司朗股份有限公司 | Over-temperature protection device, LED driver and power source protection device |
-
2013
- 2013-06-06 CN CN201310222499.6A patent/CN103281836B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101868087A (en) * | 2010-05-27 | 2010-10-20 | 上海北京大学微电子研究院 | Light-emitting diode (LED) driving chip and LED circuit |
| US20120249516A1 (en) * | 2011-04-01 | 2012-10-04 | Emagin Corporation | Amoled microdisplay device with active temperature control |
| CN202773126U (en) * | 2012-07-02 | 2013-03-06 | 欧司朗股份有限公司 | Over-temperature protection device, LED driver and power source protection device |
| CN102869155A (en) * | 2012-09-06 | 2013-01-09 | 上海晶丰明源半导体有限公司 | LED (light-emitting diode) driving source control circuit and control method thereof |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015042991A1 (en) * | 2013-09-29 | 2015-04-02 | 深圳市华星光电技术有限公司 | Led backlight driving circuit and liquid crystal display apparatus |
| US9192015B2 (en) | 2013-09-29 | 2015-11-17 | Shenzhen China Star Optoelectronics Technology Co., Ltd | LED backlight driving circuit and LCD device |
| CN103747587A (en) * | 2014-01-15 | 2014-04-23 | 西北工业大学 | LED (Light Emitting Diode) lamp radiator temperature online self-adaptation control circuit and method |
| CN103747587B (en) * | 2014-01-15 | 2016-03-30 | 西北工业大学 | A kind of LED lamp radiator temperature online adaptation control circuit |
| CN104010424A (en) * | 2014-06-17 | 2014-08-27 | 电子科技大学 | Temperature compensating circuit for linearly driving LED |
| CN104010424B (en) * | 2014-06-17 | 2016-04-27 | 电子科技大学 | The temperature-compensation circuit of a kind of Linear Driving LED |
| CN105682280A (en) * | 2014-12-08 | 2016-06-15 | 锋翔科技公司 | Automatic power controller |
| CN105682280B (en) * | 2014-12-08 | 2020-05-15 | 锋翔科技公司 | Automatic power controller |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN107660013B (en) * | 2016-07-26 | 2024-04-05 | 上海莱托思电子科技有限公司 | LED two-end constant-current driving chip and constant-current driving method |
| CN110320952A (en) * | 2019-07-22 | 2019-10-11 | 苏州欧普照明有限公司 | A kind of thermal-shutdown circuit and system |
| CN112235895A (en) * | 2020-09-10 | 2021-01-15 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit and driving power supply |
| WO2022083203A1 (en) * | 2020-10-20 | 2022-04-28 | 深圳市晟碟半导体有限公司 | Led drive circuit and led drive chip for eliminating cob encapsulation photoelectric effect |
| CN112803237A (en) * | 2021-04-08 | 2021-05-14 | 安菲腾(常州)光电科技有限公司 | High-efficiency wide-working-voltage semiconductor laser constant-current driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103281836B (en) | 2015-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103281836B (en) | Chip over-temperature protection circuit applied to alternative current LED drive system | |
| CN103281835B (en) | LED over-temperature protection circuit applied to alternative current LED drive system | |
| CN103281834B (en) | Overvoltage protection circuit applied to alternative current LED drive system | |
| TW201931948A (en) | LED lighting system for controlling silicon-controlled switch | |
| CN103354086A (en) | LED (light-emitting diode) backlight source and liquid crystal display | |
| CN104679089B (en) | Step excess temperature for integrated LED driving chip compensates protection system and circuit | |
| TW201503756A (en) | LED driver capable of regulating power dissipation and LED lighting apparatus using same | |
| CN103036203A (en) | Protection circuit | |
| CN203588109U (en) | Cascade over-temperature protection circuit for integrated LED drive chips | |
| CN108966430B (en) | Linear driving circuit of LED lighting lamp | |
| CN104039057A (en) | Constant luminous flux LED module control circuit | |
| CN205657891U (en) | Temperature detection module and have drive power supply system of temperature control function | |
| CN105916239A (en) | Over-voltage adaptive regulation circuit for linear constant current driven LED | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN203261005U (en) | LED constant-current over-temperature protection circuit and LED lamp | |
| CN203840609U (en) | LED circuit having overheating protection function | |
| CN102043413A (en) | Temperature control circuit | |
| CN103281837A (en) | Light adjusting circuit applied to LED lighting lamp | |
| CN204062925U (en) | Photoelectric integral light source module | |
| CN103167675A (en) | Light-emitting diode (LED) lamp with overheat protection circuit | |
| CN105140997A (en) | Intelligent lamp charger of intelligent traffic system | |
| CN205320340U (en) | Silicon controlled rectifier dimming circuit | |
| TW201434345A (en) | Driving module and illumination device thereof | |
| KR101403861B1 (en) | AC direct drive led power supply capable of handling overvoltage | |
| CN203708589U (en) | Linear constant current LED driving circuit possessing temperature compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN BOYONG TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DONGGUAN BOYONG TECHNOLOGY CO., LTD. Effective date: 20150604 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 523808 DONGGUAN, GUANGDONG PROVINCE TO: 518054 SHENZHEN, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150604 Address after: 518054 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee after: SHENZHEN BOYONG TECHNOLOGY CO., LTD. Address before: 523808 Guangdong province Dongguan City Songshan Lake Industrial Road, building 6 floor 2 Songhu branch Patentee before: Dongguan Boyong Electronic Technology Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191030 Address after: Fengming street Tongxiang City Industrial Park, Jiaxing City, Zhejiang province 314500 Patentee after: ZHEJIANG HAOTING LIGHTING CO., LTD. Address before: 518054 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee before: SHENZHEN BOYONG TECHNOLOGY CO., LTD. |