CN1456957A - IDE hard disc interface for supporting hot inserting and startup as inserting memory card - Google Patents
IDE hard disc interface for supporting hot inserting and startup as inserting memory card Download PDFInfo
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Abstract
一种支持热插拔和即插即用存储卡的IDE硬盘接口装置，其中电源管理电路连接存储卡插槽的电源信号引脚和插入感应引脚，还连接逻辑控制电路，并受存储卡插槽的插入感应引脚的信号的控制；逻辑控制电路包括控制开关和接口转换部分，分别与IDE硬盘接口和存储卡插槽的控制和信号总线连接，并受储存卡插槽的插入感应引脚的信号的控制。存储卡插入插槽时，插入感应引脚产生信号，电源管理电路向存储卡插槽和逻辑控制电路输出电源，并控制逻辑控制电路的控制开关和接口转换部分连通，使IDE硬盘接口和存储卡插槽的控制和信号总线连通。反之当存储卡拔出插槽时，控制开关和接口转换部分断开。采用这种接口装置，能够在电脑和其他带IDE硬盘接口的电子设备上实现CF卡和PC卡等支持热插拔和即插即用的存储卡的使用。
An IDE hard disk interface device that supports hot-swappable and plug-and-play memory cards, in which the power management circuit is connected to the power signal pin of the memory card slot and the insertion sensing pin, and is also connected to the logic control circuit, and is controlled by the memory card. The control of the signal of the insertion sensing pin of the slot; the logic control circuit includes a control switch and an interface conversion part, which are respectively connected to the control and signal bus of the IDE hard disk interface and the memory card slot, and are controlled by the insertion sensing pin of the memory card slot. control of the signal. When the memory card is inserted into the slot, the insertion sensing pin generates a signal, the power management circuit outputs power to the memory card slot and the logic control circuit, and controls the control switch of the logic control circuit to communicate with the interface conversion part, so that the IDE hard disk interface and the memory card Control and signal bus connectivity for the slot. Otherwise, when the memory card is pulled out of the slot, the control switch and the interface conversion part are disconnected. By adopting the interface device, the use of memory cards supporting hot plugging and plug-and-play, such as CF cards and PC cards, can be realized on computers and other electronic devices with IDE hard disk interfaces.
Description
Technical field
The present invention relates to the hard disk interface device in a kind of computer technology and the electronic device field, particularly relate to a kind of can being with on the IDE hard-disk interface electronic equipment and conveniently read the support hot plug of storage card and the IDE hard disk interface device of plug and play storage card at computer and other.
Background technology
The little various storage cards of various portable volumes more and more are widely used at present, wherein mainly contain CF card (Compact Flash), Micro drive, SD card (Secure Digital), MemoryStick, PC card (PCMCIA Card), SmartMedia, MMC (MultiMedia Card) etc.Now related content is described below:
The CF card is that SanDisk company in 1994 at first releases, and this storage medium is to adopt flash memory technology, can permanent preservation information, need not power supply.Speed is fast, and (having only half ounce) in light weight, volume matchbox big (thick 3.3mm, wide 42.8mm, high 36.4mm), reserves do not wait from 4,000,000 to several G.The CF card is to use the control unit interface that can be directly installed on the chip, and tape drive does not have the parts that move, and this makes it become multi-functional storage system.This controller that can carry at random makes the CF card compatible mutually with kinds of platform, as DOS, Windows, OS/2, Mac and UNIX.The most operating system and equipment of PCMCIAATA standard supported are also all supported the CF card.The CF card is easy to upgrading, adopts 50 needle interfaces.Use and also can guarantee that data were intact in more than 100 year.Support that now the equipment of CF card is a lot: as digital camera, palm PC, notebook computer, mobile phone, MP3, e-Book or the like.In addition, miniature IDE seagate of Micro Drive that CF card and IBM Corporation release and pcmcia interface also standard are compatible mutually, therefore use quite extensive
SmartMedia (SM card) is the FlashMemory flash card of being issued November nineteen ninety-five by Toshiba and Taec.The SmartMedia volume is very little, and it is of a size of 45mm * 37mm * 0.76mm, full weight 1.8 grams.Have only Flash Memory module and interface on the storage card, the capacity of SmartMedia does not wait from 4MB～64MB, and 128MB also soon releases.The SmartMedia card is the storage medium that the part digital equipment uses, and application is all arranged on MP3 and digital camera.The shortcoming of SmartMedia is not have control chip, needs special equipment to read and write, and therefore corresponding digital product must add corresponding read-write cell, will make the price of digital product slightly rise like this.
MMC is MultiMediaCard, is released in 1997 by Siemens and SanDisk, and MMC has obtained application in fields such as palm PC, mobile phone, MP3 machine, digital cameras.The size of MMC has only 32mm * 24mm * 1.4mm, weight 1.5 grams.MMC has together accomplished storage unit and controller to make MMC that good front and back compatibility be arranged on the card.This new MMC has adopted micro-processor kernel, can carry out security-related operation at a high speed, has very strong copyright protection function.Yet the shortcoming of its existence is: the highest 64MB of having only of capacity, temporarily not as other 5 kinds of storage cards, to use seldom, and transmission speed is also slower.
SD card (Secure Digital) is to be released in August, 1999 by Panasonic, Toshiba and SanDisk, and data transmit and physical specification is developed by MMC, and compatible fully with mmc card, and it is of a size of 32mm * 24mm * 2.1mm.The SD cassette tape has the physical write protection switch in addition, and safe and secret technology is better.
The PC card is early stage introduction nineties, and the creditable card size of volume adopts 68 needle interfaces, is used for most notebook computer.
The PC card is divided into three models according to thickness: Type I, Type II and Type III, it is long and wide all to be 85.6mm and 54.0mm.The size of PC card has limited it by the approval of some handheld device manufacturer, especially after the CF card occurs.Another limiting factor is its excessive battery consumption.The TypeI type goes up at memory device (as RAM, Flash and SRAM) usually and uses; Type II type is everlasting, and I/O equipment (as data/fax modems, LANs and cellular telephone interface card) is middle to be used; Type III type then is usually used in the equipment that constituent has certain thickness and large buffer memory.Similar to the CF card, there is not interchangeability in the PC module yet between equipment and installation procedure,
Usually also need PC.The PC card also claimed " PCMCIA Cards " in the past.
Memory Stick also claims Sony's internal memory rod, and it is the digital storage media of a kind of ultra micro volume (chewing gum size) integrated circuit of developing jointly of Sony company in July, 1997 and Casio, Fujitsu, Olympus, Sanyo and Sharp.It is a kind of flash card, adopts 10 needle connectors, is specifically designed to transmission information between a series of different audio frequency, video and computer equipment.Sony's internal memory rod now has been applied in Sony NP-FE1 and the new palm PC based on Palm OS.
Microdrive is the memory device that IBM Corporation releases, and its primary structure characteristics are that capacity is big, and Microdrive belongs to the Type II type of Compact Flash in fact.
More than various movable storage devices portably use easily conveniently, but the popularity and the sexual valence that just use recently compare, CF is stuck in to account at present and has great advantage, and support equipment is a lot.If on Desktop PC, CF card and PC card but can not directly use, and must use the card reader of storage card.Present card reader is the interface based on USB basically, and price is very expensive, needs hundreds of Renminbi to thousands of Renminbi, and a condition precedent is arranged is that computer must have USB interface.It is just powerless for some do not have the USB interface computer.
This shows that the interface arrangement of above-mentioned existing storage card still has many defectives, and the assistant officer treats further to be improved.
Because the defective that the interface arrangement of above-mentioned existing storage card exists, the inventor is actively studied innovation, through constantly studying, designing based on abundant practical experience and professional knowledge, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.The present invention is exactly the use that realizes CF card and PC card in order to solve on the electronic equipment of computer and other bands IDE hard-disk interface.
Summary of the invention
Technical problem underlying to be solved by this invention is, overcome the defective of the interface arrangement existence of existing storage card, and a kind of IDE hard disk interface device of supporting hot plug and plug and play storage card is provided, make the use of the storage card of support hot plugs such as can realizing CF card and PC card on its electronic equipment of being with the IDE hard-disk interface at computer and other and plug and play.
The present invention solves its technical problem underlying and realizes by the following technical solutions.A kind of IDE hard disk interface device of supporting hot plug and plug and play storage card according to the present invention proposes comprises IDE hard-disk interface and storage card slot, and it is characterized in that: it also comprises electric power management circuit and logic control circuit; Electric power management circuit connects the power supply signal pin of storage card slot and inserts the induction pin, also connects logic control circuit, and is subjected to the control of signal of the insertion induction pin of storage card slot; Logic control circuit comprises gauge tap and interface conversion part, and the control with IDE hard-disk interface and storage card slot is connected with signal bus respectively, and is stored the control of signal of the insertion induction pin of card slot.
The present invention solves its technical matters and can also adopt following technical measures further to realize.
The IDE hard disk interface device of aforesaid support hot plug and plug and play storage card, the power supply signal pin of wherein said storage card slot and insertion induction pin are longer than other pin.
The IDE hard disk interface device of aforesaid support hot plug and plug and play storage card, the insertion induction pin of wherein said 3 storage card slot is when inserting signal, electric power management circuit is to storage card slot and logic control circuit out-put supply, and the gauge tap of logic control circuit and interface conversion part are communicated with, and the control of IDE hard-disk interface and storage card slot and signal bus are communicated with.
The IDE hard disk interface device of aforesaid support hot plug and plug and play storage card, when the insertion induction pin of wherein said storage card slot is cut-off signal, electric power management circuit interrupts to storage card slot and logic control circuit out-put supply, and the gauge tap of logic control circuit and interface conversion part disconnect, and control and signal bus between IDE hard-disk interface and the storage card slot are disconnected.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, the present invention adopts the IDE hard disk interface device of this support hot plug and plug and play storage card, can realize on the electronic equipment of computer and other band IDE hard-disk interface that CF card and PC card etc. support the use of the storage card of hot plug and plug and play, can satisfy user's demand, be suitable for practical good effect more thereby have.The support hot plug of special construction of the present invention and the IDE hard disk interface device of plug and play storage card, have above-mentioned advantage and practical value, and having there is no similar structural design in like product publishes or uses, no matter it structurally or bigger improvement all arranged on the function, and have large improvement technically, and produced handy and practical effect, and have the effect of enhancement really, thereby being suitable for practicality more, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below with preferred embodiment of the present invention and conjunction with figs. describe in detail as after.
The specific embodiment of the present invention is provided in detail by following examples and accompanying drawing thereof.
Description of drawings
Fig. 1 is the circuit block diagram that structure of the present invention constitutes.
Fig. 2 is the mechanical schematic diagram of memory card interface part of the present invention.
Fig. 3 is the process flow diagram of corresponding software of the present invention.
Fig. 4 is the hardware circuit diagram of preferred embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the support hot plug that foundation the present invention is proposed and its embodiment of IDE hard disk interface device, structure, feature and the effect of plug and play storage card, describe in detail as after.
Equipment at first wants to support the interface of storage card if use storage card on hardware circuit, secondly software will have relevant driving.The present invention provides from the IDE hard-disk interface to the CF card on hardware and the electric interfaces of PC card, and supports the hot plug function, cooperates corresponding software also can realize the function of plug and play.
See also shown in Figure 1ly, the present invention supports the IDE hard disk interface device of hot plug and plug and play storage card, the realization of its hardware as shown in the figure, its structure mainly comprises electric power management circuit and logic control circuit two parts circuit.Wherein: above-mentioned electric power management circuit mainly is will realize the power management of storage card and prevent that the plug of storage card from having influence on computer and electronic equipment itself; Above-mentioned logic control circuit, its function mainly are to realize the interface conversion between IDE hard-disk interface and the memory card interface and prevent that the plug of storage card from influencing electronic equipment itself.
Now the principle of work with hardware components of the present invention is described as follows:
See also shown in Figure 2ly, the present invention mainly utilizes the mechanical interface design (as shown in the figure) of storage card to realize in conjunction with relevant circuit.This mechanical interface mainly utilizes power supply signal pin PIN1, the PIN50 on the memory card socket and inserts induction pin PIN25, PIN26 longer than other pins, thereby than the more Zao storage card that touches of other signal, thereby can use this design feature, the circuit that design is relevant is realized.As shown in Figure 2, when storage card does not insert memory card socket, memory card socket pin PIN25, PIN26 are unsettled, invalidating signal then, the logic control of circuit is partly by control gauge tap and interface conversion part circuit, circuit is disconnected, make device id E hard-disk interface not be connected with memory card socket like this, the signal fluctuation on any card can not have influence on equipment itself.After storage card inserts and contacts well fully, memory card socket pin PIN25, PIN26 ground connection on storage card, then signal is effective, control circuit is with the gauge tap conducting, and the interface conversion part circuit connects together and realize conversion of signals to the signal of the IDE hard-disk interface of computer and electronic equipment and storage card.Same principle, power unit also can be according to the power supply of memory card socket pin PIN25, PIN26 signal controlling storage card and the power supply (as shown in Figure 1) of control circuit.Realized that according to above design band IDE hard-disk interface electronic equipment uses the storage card ground hardware design of supporting hot plug and plug and play, cooperated relevant driving, just constituted a complete structural design.
Seeing also shown in Figure 3ly, is the FB(flow block) of associated drives and software.Now related procedure of the present invention is described as follows:
In the device start process, can start one cyclic query thread, this thread is the current state of cyclic query memory card port and Storage Card Drivers program ceaselessly, and having four kinds according to the result of inquiry may take place:
(1), no storage card inserts, Storage Card Drivers is not activated, and then continues inquiry;
(2), no storage card inserts, Storage Card Drivers starts, then uninstall driving after, continue inquiry;
(3), have storage card to insert, the Storage Card Drivers program also starts, and then continues inquiry;
(4), have storage card to insert, but the Storage Card Drivers program also is not activated, and then starts the Storage Card Drivers program, continues inquiry.The new Storage Card Drivers program that starts can re-execute the initialization function, so that can detect correct storage card correlation parameter, and amount of capacity for example, card form or the like.
Below in conjunction with a preferred embodiment, support concrete structure, feature and the effect thereof of the IDE hard disk interface device of hot plug and plug and play storage card to be described as follows to the present invention.
Seeing also shown in Figure 4ly, is a preferred embodiment of the present invention, and in the present embodiment, the signal that inserts the induction pin is by logic gate steering logic control circuit, and inserting induction pins when all is that logic gate produces the signal of start-up control switch when inserting signal; When an insertion induction pin was cut-off signal, logic gate produced the signal of closing control switch.
Comprise a controllable power in the electric power management circuit, its out-put supply connects storage card slot and gauge tap respectively.Insert the signal of induction pin and control controllable power by logic gate, inserting the induction pin when all is that logic gate produces the signal that starts controllable power when inserting signal; When an insertion induction pin was cut-off signal, logic gate produced the signal of closing controllable power.
The model of controllable power is MIC2025.
Storage card inserts induced signal CDX1, CDX2 and is connected to memory card socket pin PIN25, PIN26.The CDX signal is the logical and of CDX1, CDX2, have only like this when storage card and insert memory card socket fully, (being all low) CDX signal is just effectively effectively the time simultaneously to insert induced signal CDX1, CDX2, as long as one of them CDX1 or CDX2 invalidating signal are arranged, the CDX signal is just invalid, has so just avoided contacting bad situation and has taken place.Signal-controlled switch is the electronic switch that can control closed and disconnected among the figure, when the enable signal EN1 of Signal-controlled switch is effective, and electronic switch closes then, switch conduction, input and output signal links to each other, otherwise electronic switch then disconnects.Controllable power among the figure is one can control the electronic switch that power supply output has or not, when the enable signal EN2 of controllable electric power signal is effective, the output VCC1 of controllable electric power and VCC2 just have power supply output, when the enable signal EN2 of controllable electric power invalidating signal, the output VCC1 of controllable electric power and VCC2 do not have power supply output.
Below in conjunction with present embodiment its principle of work is described.After storage card inserted memory card socket fully, effectively, at this moment the CDX signal was just effective simultaneously for signal CDX1, CDX2.The CDX signal is connected to the enable pin of Signal-controlled switch and controllable power simultaneously.Like this after the CDX signal is effective, the enable signal EN2 of controllable power is effective, controllable power will out-put supply VCC1 and VCC2 to storage card and Signal-controlled switch, and at this moment the enable signal EN1 of Signal-controlled switch is effective, gauge tap is just closed like this, and the signal of storage card just is connected to the IDE hard-disk interface.Same principle, when extracting storage card, it is invalid to insert induced signal CDX1, CDX2, make the CDX invalidating signal, the enable signal EN2 of controllable electric power and the enable signal EN1 of Signal-controlled switch are invalid, then not output of controllable electric power, Signal-controlled switch disconnects, and so just storage card is disconnected from the IDE hard-disk interface.Realized that according to above design band IDE hard-disk interface electronic equipment uses the hardware design of the storage card of supporting hot plug and plug and play like this.It cooperates relevant driving, has just formed a complete structure design.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (10)
1, a kind of IDE hard disk interface device of supporting hot plug and plug and play storage card comprises IDE hard-disk interface and storage card slot, it is characterized in that it also comprises electric power management circuit and logic control circuit, wherein:
This electric power management circuit connects the power supply signal pin of storage card slot and inserts the induction pin, also connects logic control circuit, and is subjected to the control of signal of the insertion induction pin of storage card slot;
This logic control circuit comprises gauge tap and interface conversion part, and the control with IDE hard-disk interface and storage card slot is connected with signal bus respectively, and is stored the control of signal of the insertion induction pin of card slot;
2, IDE hard disk interface device according to claim 1 is characterized in that the power supply signal pin of storage card slot and insertion induction pin are longer than other pin,
3, IDE hard disk interface device according to claim 1 is characterized in that the insertion induction pin of wherein said storage card slot is that electric power management circuit is to storage card slot and logic control circuit out-put supply when inserting signal.
4, according to claim 1,3 described IDE hard disk interface devices, the insertion induction pin that it is characterized in that wherein said storage card slot is when inserting signal, the gauge tap of logic control circuit and interface conversion part are communicated with, and the control of IDE hard-disk interface and storage card slot and signal bus are communicated with.
5, IDE hard disk interface device according to claim 1, when the insertion induction pin that it is characterized in that wherein said storage card slot was cut-off signal, electric power management circuit interrupted to storage card slot and logic control circuit out-put supply.
6, according to claim 1,5 described IDE hard disk interface devices, when the insertion induction pin that it is characterized in that wherein said storage card slot is cut-off signal, the gauge tap of logic control circuit and interface conversion part disconnect, and control and signal bus between IDE hard-disk interface and the storage card slot are disconnected.
7, IDE hard disk interface device according to claim 1, the signal that it is characterized in that inserting the induction pin are by logic gate steering logic control circuit, and inserting the induction pin when all is that logic gate produces the signal of start-up control switch when inserting signal; When an insertion induction pin was cut-off signal, logic gate produced the signal of closing control switch.
8, according to claim 1,3,5 described IDE hard disk interface devices, it is characterized in that comprising in the electric power management circuit controllable power, its out-put supply connects storage card slot and gauge tap respectively.
9, IDE hard disk interface device according to claim 8 is characterized in that inserting the signal of responding to pin and controls controllable power by logic gate, and inserting induction pins when all is that logic gate produces the signal of startup controllable power when inserting signal; When an insertion induction pin was cut-off signal, logic gate produced the signal of closing controllable power.
10, according to Claim 8,9 described IDE hard disk interface devices, the model that it is characterized in that controllable power is MIC2025.
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| CN 02117649 CN1241096C (en) | 2002-05-10 | 2002-05-10 | IDE hard disc interface for supporting hot inserting and startup as inserting memory card |
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| CN 02117649 CN1241096C (en) | 2002-05-10 | 2002-05-10 | IDE hard disc interface for supporting hot inserting and startup as inserting memory card |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006129207A3 (en) * | 2005-06-03 | 2007-03-29 | Chan Kam-Fu | Method of connecting mass storage device |
| CN100368993C (en) * | 2004-11-18 | 2008-02-13 | 国际商业机器公司 | Apparatus, system, and method for integrating an enclosure |
| WO2008071113A1 (en) * | 2006-12-14 | 2008-06-19 | Huawei Technologies Co., Ltd. | Method and apparatus prevent a cf card away from being damaged |
| CN100508481C (en) * | 2004-07-27 | 2009-07-01 | 广达电脑股份有限公司 | Method for automatically distributing communication port address and blade type server system thereof |
| CN101378339B (en) * | 2008-10-07 | 2010-09-29 | 北京星网锐捷网络技术有限公司 | Control method and apparatus, business board for heat insertion and pull |
| CN103530265A (en) * | 2013-10-24 | 2014-01-22 | 烽火通信科技股份有限公司 | Device and method for realizing safe hot plugging of CF card of electronic equipment |
| CN103809879A (en) * | 2014-02-20 | 2014-05-21 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104598789A (en) * | 2015-02-15 | 2015-05-06 | 联想(北京)有限公司 | Protection method of hot-plugging functional module device and electronic device |
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| CN101799714B (en) * | 2010-03-30 | 2012-07-04 | 成都市华为赛门铁克科技有限公司 | Method and device for controlling slot power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100508481C (en) * | 2004-07-27 | 2009-07-01 | 广达电脑股份有限公司 | Method for automatically distributing communication port address and blade type server system thereof |
| CN100368993C (en) * | 2004-11-18 | 2008-02-13 | 国际商业机器公司 | Apparatus, system, and method for integrating an enclosure |
| US10261552B2 (en) | 2005-06-03 | 2019-04-16 | Kam Fu Chan | Method of connecting mass storage device |
| CN100594486C (en) * | 2005-06-03 | 2010-03-17 | 陈锦夫 | Method for connecting mass storage device |
| WO2006129207A3 (en) * | 2005-06-03 | 2007-03-29 | Chan Kam-Fu | Method of connecting mass storage device |
| WO2008071113A1 (en) * | 2006-12-14 | 2008-06-19 | Huawei Technologies Co., Ltd. | Method and apparatus prevent a cf card away from being damaged |
| CN101201888B (en) * | 2006-12-14 | 2010-09-15 | 华为技术有限公司 | Method and device for reducing CF card breakage |
| CN101378339B (en) * | 2008-10-07 | 2010-09-29 | 北京星网锐捷网络技术有限公司 | Control method and apparatus, business board for heat insertion and pull |
| CN103530265B (en) * | 2013-10-24 | 2016-06-01 | 烽火通信科技股份有限公司 | Realize the device and method of the CF card safe hot plug of electronics |
| CN103530265A (en) * | 2013-10-24 | 2014-01-22 | 烽火通信科技股份有限公司 | Device and method for realizing safe hot plugging of CF card of electronic equipment |
| CN103809879A (en) * | 2014-02-20 | 2014-05-21 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104598789A (en) * | 2015-02-15 | 2015-05-06 | 联想(北京)有限公司 | Protection method of hot-plugging functional module device and electronic device |
| CN104598789B (en) * | 2015-02-15 | 2018-02-27 | 联想(北京)有限公司 | A kind of guard method of warm connection function module device and electronic equipment |
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| CN1241096C (en) | 2006-02-08 |
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Effective date of registration: 20131205 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: DATONG POWER SUPPLY COMPANY, STATE GRID SHANXI ELECTRIC POWER CO., LTD. Patentee after: Lenovo (Beijing) Co., Ltd. Address before: 100085 Beijing on the road to entrepreneurship, No. 6 Haidian District Patentee before: Lenovo (Beijing) Co., Ltd. |
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Effective date of registration: 20131219 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: DATONG POWER SUPPLY COMPANY, STATE GRID SHANXI ELECTRIC POWER CO., LTD. Patentee after: Lenovo (Beijing) Co., Ltd. Address before: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee before: State Grid Corporation of China Patentee before: DATONG POWER SUPPLY COMPANY, STATE GRID SHANXI ELECTRIC POWER CO., LTD. Patentee before: Lenovo (Beijing) Co., Ltd. |
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