CN103423184A - Power-type fan speed control circuit and fan device - Google Patents
Power-type fan speed control circuit and fan device Download PDFInfo
- Publication number
- CN103423184A CN103423184A CN2012101499018A CN201210149901A CN103423184A CN 103423184 A CN103423184 A CN 103423184A CN 2012101499018 A CN2012101499018 A CN 2012101499018A CN 201210149901 A CN201210149901 A CN 201210149901A CN 103423184 A CN103423184 A CN 103423184A
- Authority
- CN
- China
- Prior art keywords
- power
- fan
- termination
- circuit
- input
- 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
Landscapes
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention relates to the field of control circuits, in particular to a power-type fan speed control circuit and a fan device. A power detecting unit detects the operating power of a device to be cooled and outputs the power signals to a control unit, and the control unit controls the speed of the fan according to the power signals. Since the power of the device to be cooled is detected directly, compared with a temperature-sensing-type fan speed control circuit in the prior art, the power-type fan speed control circuit and the fan device have the advantages of high control stability, small errors, high accuracy, control timeliness and the like.
Description
Technical field
The present invention relates to the control circuit field, especially a kind of power formula circuit for controlling speed of fan and fan assembly.
Background technique
General electronic products system host (as the household desk computer) cabinet inside, some form with heat of power that the electronic parts and components operation consumes comes out, cause the rising of cabinet inside temperature, along with the rising of temperature, can cause many harmful effects to electronic product.Solve this type of temperature problem and generally at cabinet inside, install with temperature and uprise low and automatically regulate the radiation fan of rotation speed of the fan speed, this type of radiation fan inside is provided with circuit for controlling speed of fan.
The temperature induction types of the most employing of circuit for controlling speed of fan at present, be induction by the variation of heat sink temperature, when by heat sink temperature, being surpassed a particular value, increase rotation speed of the fan, reach the effect of strengthening heat radiation, and, when low by heat sink temperature, reduce rotation speed of the fan, reduce noise, power consumption and extend the effect that fan uses to play.The circuit for controlling speed of fan of this type of temperature induction type, generally used thermistor as temperature sensitive member.And thermistor causes in control being difficult to the requirement that reaches linear originally as nonlinear element; And thermistor easily is subject to the impact of periphery and ambient temperature and causes positively reflecting the true temperature state of privileged site, easily cause the unsettled problem that detects; The accuracy that thermistor detects in addition and the point of contact between article to be measured easily are subject to that area of contact is big or small, relative distance and the position that contacts affect; Also can there be certain reaction time in the thermistor detected temperatures in addition, causes control not in time.In sum, adopt at present the circuit for controlling speed of fan of thermistor to have that control stability is lower, error is large, validity is not high, control the problem that waits not in time.
Summary of the invention
The object of the present invention is to provide a kind of power formula circuit for controlling speed of fan and fan assembly, be intended to solve that circuit for controlling speed of fan of the prior art exists that control stability is lower, error is large, validity is not high, control the problem that waits not in time.
The technical solution used in the present invention is: a kind of power formula circuit for controlling speed of fan, and be connected with fan by sink, and it is characterized in that, comprising:
The input termination, by sink, detects by the power detecting unit of sink working power immediately;
Input termination input power, control termination power detecting unit output terminal, output terminal wind-receiving fan, the power signal of exporting according to power detecting unit is controlled the control unit of rotation speed of the fan.
Described power detecting unit comprises:
The input termination is described by sink, immediately responds to described by the power-sensing circuit of the operating current of sink;
The output terminal of the described power-sensing circuit of input termination, by the rectification circuit of the current commutates of described power-sensing circuit output;
The output terminal of the described rectification circuit of input termination, the eliminator of the electric current clutter of the described rectification circuit output of filtering;
The output terminal of input termination described eliminator, the control end of the described control unit of output termination, the control signal that the current conversion of described eliminator output is become to be suitable for control unit work exports the output circuit of control unit to.
Described control unit comprises triode Q1, triode Q2, resistance R 4, resistance R 5, diode D5, capacitor C 2;
The positive pole of described diode D5 connects the base stage of described triode Q1 as output terminal, the negative pole of the control termination power detecting unit of control unit;
The emitter of described triode Q1 connects the first end of described resistance R 4, the second end ground connection of described resistance R 4, the collector electrode of described triode Q1 connects the first end of described resistance R 5, and the second end of described resistance R 5 is as the described input power of input termination of described control unit;
The base stage of described triode Q2 connect the collector electrode, emitter of described triode Q1 as the described input power of input termination of described control unit, collector electrode the positive pole as the described fan of output termination of described control unit; Described fan minus earth;
The base stage of the described triode Q1 of the first termination of described capacitor C 2, the described input power of the second termination.
The positive pole of described fan also is connected to accessory power supply by diode D6, and the positive pole of described diode D6 connects the positive pole of accessory power supply, negative pole wind-receiving fan.
Described power-sensing circuit is current transformer T1, and the primary coil of described current transformer is all exported the described rectification circuit input end of termination as described power-sensing circuit as the input termination of described power-sensing circuit is described by the first end of sink, secondary coil and the second end.
Described rectification circuit is the bridge rectifier be comprised of diode D1, diode D2, diode D3, diode D4;
The negative pole of the positive pole of described diode D1 and described diode D4 is all as the output terminal of the described power-sensing circuit of input termination of described rectification circuit, the negative pole of described diode D1 is as the input end of the described eliminator of output termination of described rectification circuit, the plus earth of described diode D4.
Described eliminator is a capacitor C 1, described capacitor C 1 first end as the output terminal of the described rectification circuit of input termination of described eliminator, described capacitor C 1 first end simultaneously as the input end of the described output circuit of output termination of described eliminator, described capacitor C 1 second end ground connection.
Described output circuit comprises resistance R 1, resistance R 2, resistance R 3;
The first end of described resistance R 1 is as output terminal, the second end ground connection of the described eliminator of input termination of described output circuit;
The first end of the described resistance R 1 of the first termination of described resistance R 2, the first end of the described resistance R 3 of the second termination, the second end ground connection of described resistance R 3;
The first end of described resistance R 3 is as the input end of the described control unit of output termination of described output circuit.
A kind of fan assembly, comprise above-described power formula fan control circuitry.
Power formula circuit for controlling speed of fan provided by the invention, detect by the sink working power by power detecting unit, and export the power signal detected to control unit, and control unit is controlled the rotating speed of fan according to this power signal.Power formula circuit for controlling speed of fan provided by the invention and fan assembly, due to direct-detection by the power of sink, therefore with respect to temperature induction type circuit for controlling speed of fan of the prior art, have that control stability is high, error is little, validity is high, control the advantages such as timely.
The accompanying drawing explanation
The schematic block circuit diagram of the power formula circuit for controlling speed of fan that Fig. 1 provides for the embodiment of the present invention;
The circuit theory diagrams of the power formula circuit for controlling speed of fan that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making purpose of the present invention, technological scheme and advantage clearer, clear, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only for explaining the present invention, is not limited to the present invention.
Power formula circuit for controlling speed of fan provided by the invention, detect by the sink working power by power detecting unit, and export the power signal detected to control unit, and control unit is controlled the rotating speed of fan according to this power signal.Power formula circuit for controlling speed of fan provided by the invention and fan assembly, due to direct-detection by the power of sink, therefore with respect to temperature induction type circuit for controlling speed of fan of the prior art, have that control stability is high, error is little, validity is high, control the advantages such as timely.
With reference to Fig. 1, the power formula circuit for controlling speed of fan theory diagram that the embodiment of the present invention provides.A kind of power formula circuit for controlling speed of fan, and be connected with fan 300 by sink 400, comprising: the input termination, by sink 400, detects by the power detecting unit 100 of sink 400 working powers immediately; Input termination input power 500, control termination power detecting unit 100 output terminals, output terminal wind-receiving fan 300, the power signal of exporting according to power detecting unit 100 is controlled the control unit 200 of fan 300 rotating speeds.
The power formula circuit for controlling speed of fan that the present embodiment provides, by power detecting unit 100, detect by sink 400 working powers, and export the power signal detected to control unit 200, control unit 200 is controlled the rotating speed of fan according to this power signal, with respect to temperature induction type circuit for controlling speed of fan of the prior art, have that control stability is high, error is little, validity is high, control the advantages such as timely.
With reference to Fig. 2, the circuit theory diagrams of the power formula circuit for controlling speed of fan that the embodiment of the present invention provides.A kind of power formula circuit for controlling speed of fan, and be connected with fan 300 by sink 400, comprising: the input termination, by sink 400, detects by the power detecting unit 100 of sink 400 working powers immediately; Input termination input power 500, control termination power detecting unit 100 output terminals, output terminal wind-receiving fan 300, the power signal of exporting according to power detecting unit 100 is controlled the control unit 200 of fan 300 rotating speeds.
As one embodiment of the invention, power-sensing circuit 101 is current transformer T1, and the primary coil of current transformer 101 is all exported described rectification circuit 102 input ends of termination as power-sensing circuit 101 as the input termination of power-sensing circuit 101 is described by the first end of sink 400, secondary coil and the second end.
As one embodiment of the invention, rectification circuit 102 is the bridge rectifier be comprised of diode D1, diode D2, diode D3, diode D4; The negative pole of the positive pole of diode D1 and diode D4 is all as the output terminal of the input termination power-sensing circuit 101 of rectification circuit 102, the negative pole of diode D1 is as the input end of the output termination eliminator 103 of rectification circuit 102, the plus earth of diode D4.
As one embodiment of the invention, eliminator 103 is a capacitor C 1, capacitor C 1 first end as the output terminal of the described rectification circuit 102 of input termination of eliminator 103, capacitor C 1 first end simultaneously as the input end of the described output circuit 104 of output termination of eliminator 103, capacitor C 1 second end ground connection.
As one embodiment of the invention, output circuit 104 comprises resistance R 1, resistance R 2, resistance R 3.The first end of resistance R 1 is as output terminal, the second end ground connection of the input termination eliminator 103 of output circuit 104; The first end of the first end connecting resistance R1 of resistance R 2, the first end of the second terminating resistor R3, the second end ground connection of resistance R 3; The first end of resistance R 3 is as the input end of the output termination control unit 200 of output circuit 104.This output circuit is by the resistance of different resistance R 1, resistance R 2, resistance R 3 is set, current potential that can the regulation output signal.
The positive pole of fan 300 also is connected to accessory power supply Vin ' by diode D6, and the voltage of this accessory power supply Vin ' is 5V, and the positive pole of diode D6 connects the positive pole of accessory power supply Vin ', negative pole wind-receiving fan 300.
The working principle of the power formula circuit for controlling speed of fan that the present embodiment provides is:
When system boot, input power 500 changes suddenly, at this moment C2 is equivalent to short circuit, character due to the one-way conduction of diode D5, therefore input power 500 transfers to triode Q1 base stage basically fully, now triode Q1 base potential is equal to input power 500 current potentials substantially, so triode Q1 is in saturation state, and the current potential of triode Q1 collector electrode is dragged down.Because triode Q2 base stage is connected with triode Q1 collector electrode, so triode Q2 base stage is also in low potential and in saturation state.Now, input power 500 is powered to fan 300 through triode Q2, due to triode Q2 when the saturation state, pressure drop Vce between its transmitter and collector electrode is very little, in addition due to the unilateral conduction of diode D6, therefore the voltage of input power 500 is loaded on fan 300 substantially, adds the accessory power supply Vin ' of 5V, thus now fan 300 in high-speed state.
Along with the variation of time, capacitor C 2 is recovery characteristics slowly, and the current potential of triode Q1 base stage slowly descends, and between last triode Q1 base stage and input power 500, by capacitor C 2, is separated.Now system enters normal working, the power-sensing circuit 101 of power detecting unit 100 will detect by the electric current of sink 400, this electric current detected is outputed voltage signal to the input end of control unit 200 after rectification circuit 102 rectifications, eliminator 103 filtering by output circuit 104, export triode Q1 base stage to.
Now rotation speed of the fan will be subject to be controlled by the instant working power of sink 400.When power detecting unit 100 detects when low by sink 400 zero loads or power, the power signal of now power detecting unit 100 output be voltage signal by deficiency so that triode Q1 enters on state, now triode Q2 due to base stage in high petential and in cut-off state, therefore now fan 300 is powered by accessory power supply Vin ', in low speed state, now whole circuit is in low noise, energy-conservation state.
When power detecting unit 100 detects by sink 400 power when higher, the power signal of now power detecting unit 100 outputs is the conducting voltage that voltage signal will be greater than triode Q1, make triode Q1 conducting and enter magnifying state, and then the current potential that drags down triode Q1 collector electrode is the current potential of triode Q2 base stage, make triode Q2 enter magnifying state, now input power 500 is loaded on fan 300 by triode Q2.Now fan 300 is by accessory power supply Vin ' and input power 500 power supplies, the input power 500 that wherein is loaded on fan 300 is subject to by the control of sink 400 real-time powers, when by sink 400 real-time powers when large, the input power 500 be loaded on fan 300 is large, otherwise little, now the power formula circuit for controlling speed of fan is regulated the rotating speed of fan immediately according to the size by sink 400 working powers, plays good radiating effect.In addition, owing to adopting power-sensing circuit 101 to detect accurately by the instant working power of sink 400, and by rectification circuit 102, eliminator 103, the undelayed control unit that transfers to of output circuit 104, therefore this power formula circuit for controlling speed of fan is with respect to temperature induction type circuit for controlling speed of fan of the prior art, has that control stability is high, error is little, validity is high, control the advantages such as timely.
In addition, in the process of restarting in system, as described in the working principle during as system boot, fan 300 can high-revolving work certain hour, thereby guarantees when system high temperature is restarted effectively heat to be discharged.
The present invention also provides a kind of fan assembly of power formula circuit for controlling speed of fan as mentioned above that comprises.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within principle of the present invention, be equal to and replace and improvement etc., within all should being included in the scope of protection of the invention.
Claims (9)
1. a power formula circuit for controlling speed of fan, and be connected with fan by sink, it is characterized in that, comprising:
The input termination, by sink, detects by the power detecting unit of sink working power immediately;
Input termination input power, control termination power detecting unit output terminal, output terminal wind-receiving fan, the power signal of exporting according to power detecting unit is controlled the control unit of rotation speed of the fan.
2. power formula circuit for controlling speed of fan according to claim 1, is characterized in that, described power detecting unit comprises:
The input termination is described by sink, immediately responds to described by the power-sensing circuit of the operating current of sink;
The output terminal of the described power-sensing circuit of input termination, by the rectification circuit of the current commutates of described power-sensing circuit output;
The output terminal of the described rectification circuit of input termination, the eliminator of the electric current clutter of the described rectification circuit output of filtering;
The output terminal of input termination described eliminator, the control end of the described control unit of output termination, the control signal that the current conversion of described eliminator output is become to be suitable for control unit work exports the output circuit of control unit to.
3. power formula circuit for controlling speed of fan according to claim 1, is characterized in that, described control unit comprises triode Q1, triode Q2, resistance R 4, resistance R 5, diode D5, capacitor C 2;
The positive pole of described diode D5 connects the base stage of described triode Q1 as output terminal, the negative pole of the control termination power detecting unit of control unit;
The emitter of described triode Q1 connects the first end of described resistance R 4, the second end ground connection of described resistance R 4, the collector electrode of described triode Q1 connects the first end of described resistance R 5, and the second end of described resistance R 5 is as the described input power of input termination of described control unit;
The base stage of described triode Q2 connect the collector electrode, emitter of described triode Q1 as the described input power of input termination of described control unit, collector electrode the positive pole as the described fan of output termination of described control unit; Described fan minus earth;
The base stage of the described triode Q1 of the first termination of described capacitor C 2, the described input power of the second termination.
4. power formula fan control circuitry according to claim 3, is characterized in that, the positive pole of described fan also is connected to accessory power supply by diode D6, and the positive pole of described diode D6 connects the positive pole of accessory power supply, negative pole wind-receiving fan.
5. power formula fan control circuitry according to claim 2, it is characterized in that, described power-sensing circuit is current transformer T1, and the primary coil of described current transformer is all exported the described rectification circuit input end of termination as described power-sensing circuit as the input termination of described power-sensing circuit is described by the first end of sink, secondary coil and the second end.
6. power formula fan control circuitry according to claim 2, is characterized in that, described rectification circuit is the bridge rectifier be comprised of diode D1, diode D2, diode D3, diode D4;
The negative pole of the positive pole of described diode D1 and described diode D4 is all as the output terminal of the described power-sensing circuit of input termination of described rectification circuit, the negative pole of described diode D1 is as the input end of the described eliminator of output termination of described rectification circuit, the plus earth of described diode D4.
7. power formula fan control circuitry according to claim 2, it is characterized in that, described eliminator is a capacitor C 1, described capacitor C 1 first end as the output terminal of the described rectification circuit of input termination of described eliminator, described capacitor C 1 first end simultaneously as the input end of the described output circuit of output termination of described eliminator, described capacitor C 1 second end ground connection.
8. power formula fan control circuitry according to claim 2, is characterized in that, described output circuit comprises resistance R 1, resistance R 2, resistance R 3;
The first end of described resistance R 1 is as output terminal, the second end ground connection of the described eliminator of input termination of described output circuit;
The first end of the described resistance R 1 of the first termination of described resistance R 2, the first end of the described resistance R 3 of the second termination, the second end ground connection of described resistance R 3;
The first end of described resistance R 3 is as the input end of the described control unit of output termination of described output circuit.
9. a fan assembly, is characterized in that, comprises power formula fan control circuitry as described as claim 1-8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149901.8A CN103423184B (en) | 2012-05-15 | 2012-05-15 | A kind of power formula circuit for controlling speed of fan and fan assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149901.8A CN103423184B (en) | 2012-05-15 | 2012-05-15 | A kind of power formula circuit for controlling speed of fan and fan assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103423184A true CN103423184A (en) | 2013-12-04 |
| CN103423184B CN103423184B (en) | 2016-12-14 |
Family
ID=49648414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210149901.8A Active CN103423184B (en) | 2012-05-15 | 2012-05-15 | A kind of power formula circuit for controlling speed of fan and fan assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103423184B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822585A (en) * | 2015-01-09 | 2016-08-03 | 中国长城计算机深圳股份有限公司 | Multi-mode fan control circuit with delay function, cooling device and electronic equipment |
| WO2018033075A1 (en) * | 2016-08-18 | 2018-02-22 | Huawei Technologies Co., Ltd. | Proactive fan speed adjustment |
| CN113347750A (en) * | 2020-02-18 | 2021-09-03 | 青岛海尔电冰箱有限公司 | Control method for heating unit, heating unit and refrigerating and freezing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2586835Y (en) * | 2002-07-23 | 2003-11-19 | 迎广科技股份有限公司 | Rotational speed governor for power type fan |
| US20040263105A1 (en) * | 2003-06-25 | 2004-12-30 | Ming-Shi Tsai | Thermal control variable-speed circuit without switching noise |
| CN101477393A (en) * | 2009-01-19 | 2009-07-08 | 浪潮电子信息产业股份有限公司 | Method for reducing system noise through power supply |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
-
2012
- 2012-05-15 CN CN201210149901.8A patent/CN103423184B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2586835Y (en) * | 2002-07-23 | 2003-11-19 | 迎广科技股份有限公司 | Rotational speed governor for power type fan |
| US20040263105A1 (en) * | 2003-06-25 | 2004-12-30 | Ming-Shi Tsai | Thermal control variable-speed circuit without switching noise |
| CN101477393A (en) * | 2009-01-19 | 2009-07-08 | 浪潮电子信息产业股份有限公司 | Method for reducing system noise through power supply |
| CN202612162U (en) * | 2012-05-15 | 2012-12-19 | 中国长城计算机深圳股份有限公司 | Power-type fan rotational speed control circuit and fan device |
Non-Patent Citations (1)
| Title |
|---|
| 吕宽州: "《模拟电子技术》", 31 December 2001 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822585A (en) * | 2015-01-09 | 2016-08-03 | 中国长城计算机深圳股份有限公司 | Multi-mode fan control circuit with delay function, cooling device and electronic equipment |
| CN105822585B (en) * | 2015-01-09 | 2017-11-14 | 中国长城科技集团股份有限公司 | A kind of multi-mode fan control circuitry, heat abstractor and electronic equipment being delayed |
| WO2018033075A1 (en) * | 2016-08-18 | 2018-02-22 | Huawei Technologies Co., Ltd. | Proactive fan speed adjustment |
| CN113347750A (en) * | 2020-02-18 | 2021-09-03 | 青岛海尔电冰箱有限公司 | Control method for heating unit, heating unit and refrigerating and freezing device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103423184B (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8198838B2 (en) | Circuit for controlling rotation speed of computer fan | |
| CN207301555U (en) | A kind of automatic heating module of liquid crystal display | |
| CN103423184A (en) | Power-type fan speed control circuit and fan device | |
| CN202612162U (en) | Power-type fan rotational speed control circuit and fan device | |
| CN202383594U (en) | Singlechip reset circuit | |
| CN203104293U (en) | Switching power supply and switching power supply integrated circuit | |
| CN102207098A (en) | Fan control circuit | |
| CN203504787U (en) | Electromagnetic heating circuit and electric pressure cooker | |
| CN204419661U (en) | A kind of multi-mode fan control circuitry, sink and electronic equipment | |
| CN203164784U (en) | Portable thermostatic control heating device for insulating oil corrosive sulfur detection device | |
| CN203009348U (en) | Fan speed control system based on thermistor design | |
| TWI473402B (en) | Power converting apparatus | |
| CN207301851U (en) | Photovoltaic maximal power tracing controller | |
| CN204730951U (en) | A kind of transformer overtemperature alarm | |
| CN104377655A (en) | Field loss protection relay of direct-current motor | |
| CN201904731U (en) | Power-supply circuit for power transformer | |
| CN206314010U (en) | A kind of electronic equipment and its single-chip microcomputer heater circuit | |
| CN205281389U (en) | Notebook computer heat dissipation base circuit of intelligence speed governing | |
| CN204836151U (en) | Radio communication device | |
| CN203561856U (en) | Control chip for soybean milk machine | |
| CN204290278U (en) | A kind of direct current machine field loss protection relay | |
| CN203588094U (en) | Simulation temperature control circuit | |
| CN202957750U (en) | Power supply circuit for improving load capacity of two-wire meter | |
| CN205539169U (en) | From master control temperature floor zero cross detection circuit | |
| CN203911793U (en) | Zero-cross detection circuit applied to switch power supply synchronous rectification converter |
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 | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee after: China the Great Wall science and technology group Limited by Share Ltd Address before: 518057 computer building of the Great Wall, Nanshan District science and Technology Park, Shenzhen, Guangdong Patentee before: China Changcheng Computer Shenzhen Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |