CN1326359C - Power supply apparatus monitoring method and equipment based on common telephone network - Google Patents
Power supply apparatus monitoring method and equipment based on common telephone network Download PDFInfo
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- CN1326359C CN1326359C CNB021241473A CN02124147A CN1326359C CN 1326359 C CN1326359 C CN 1326359C CN B021241473 A CNB021241473 A CN B021241473A CN 02124147 A CN02124147 A CN 02124147A CN 1326359 C CN1326359 C CN 1326359C
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Abstract
The present invention provides a method and a device for monitoring power supply appliances based on a common telephone network. The present invention is characterized in that the operating state data of a power supply appliance is collected in real time, and the data is processed to generate associated information; the information is sent out through a common telephone network so as to realize the transfer of the information of the power supply appliance; information sent from the common telephone network is received and processed so as to generate query information and control information; the query information is sent back to the common telephone network through the communication with the power supply appliance; thereby, the query of the operating state of the power supply appliance is realized, the control information is transferred to the power supply appliance, and the control of the power supply appliance is realized. The present invention has the advantages of simple structure and low cost. Information can be effectively transferred in time at any time in any place without the requirements of attendance people when the power supply appliance has to transfer information. The present invention can also monitor the power supply appliance actively and remotely at any time in any place through an active query method.
Description
Technical field
The invention belongs to telephone communication and power supply control technology field, is a kind of power-supply device method for supervising and device based on common telephone network concretely.
Background technology
At present, the monitor mode of power-supply device is generally two kinds, i.e. unit mode and network mode.The common feature of this dual mode is, must by single computer or based on the computer on certain network could monitoring power supply the operating state of equipment, be subjected to above condition restriction, when power-supply device need transmit information, then can't transmit relevant information whenever and wherever possible timely and effectively, even if some equipment can transmit information, but do not confirm means yet.Simultaneously, people also can't understand the operation conditions of power-supply device at any time on non-network.
American Power Convertion Corp., adopts the Internet net that power-supply device is monitored, and is characterized in power-supply device is hung on the Ethernet, and Ethernet inserts the Internet net again, by network ruuning situation, the failure condition of power-supply device is monitored.Yet, this method for supervising to power-supply device exists bigger limitation, because some network can not at will land, as: the network of bank, relate to network of national security or the like, so just make the user of a lot of power-supply devices can not accept this method.This method also may receive automatic network " hacker's " attack.Be subjected to a large amount of environment and the scenes of restriction of network and computer condition can't use this technology in addition, administrative staff can't be monitored power-supply device at all in real time, thereby strengthened the possibility of power-supply device self and affiliated electric power system inefficacy.
In sum, the monitor mode of power-supply device of the prior art is the monitor mode that depends on computer, internet, not only cost height, limitation are big, vulnerable for they, and when power-supply device need transmit information, can't transmit information whenever and wherever possible timely and effectively, maybe can transmit but can not get confirming
Thereby make the necessary information of power-supply device can not in time be transmitted the possibility that has strengthened power-supply device self and affiliated electric power system inefficacy, cause unnecessary economic loss.
Summary of the invention
The objective of the invention is to, a kind of power-supply device method for supervising and device based on common telephone network is provided, make dependence to computer and internet is completely free of in the monitoring of power-supply device, simple in structure, cost is low, and is not subjected to the limitation of network, can not be subjected to the attack of " hacker ".When power-supply device need transmit information, the personnel that need not on duty just can be at any time and any place, timely and effectively, can transmit information with being identified.The present invention can also realize active monitoring, the remote monitoring to power-supply device by the method for active inquiry whenever and wherever possible, and simple to operate.
The object of the present invention is achieved like this:
A kind of power-supply device method for supervising based on common telephone network is characterized in that, gathers the power-supply device running state data in real time, these data are handled, generate relevant information, this information is sent by common telephone network, realize that power-supply device information transmits;
The information that reception is transmitted from common telephone network, this information that transmits is handled, generated query information and control information, through being returned to common telephone network by Query Information with the power-supply device communication, realization is to the inquiry of power-supply device running status, send control information to power-supply device, realize control power-supply device.
Described relevant information is sent by common telephone network is meant: can set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, connect called phone by this telephone number.
Described reception is meant from the information that common telephone network transmits: can adopt the arbitrary communication terminal that is on the communication network, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network.
Described this information that transmits is handled, generated query information and control information are meant: the information that transmits from common telephone network is carried out cryptographic check, can accept the information that transmits from common telephone network after the verification succeeds, this information is handled back generated query information and control information, through being returned to common telephone network by Query Information with the power-supply device communication, control information sends power-supply device to.
Described a kind of power-supply device method for supervising based on common telephone network, its step comprises:
Gather the power-supply device running state data in real time;
This power-supply device running state data is handled, generated relevant information;
Set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, connect called phone by this telephone number and carry out power-supply device information and transmit;
The access side can adopt the arbitrary communication terminal that is on the communication network, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network;
The information that transmits from common telephone network is carried out cryptographic check, can accept the information that transmits from common telephone network after the verification succeeds, this information is handled back generated query information and control information, through being returned to common telephone network by Query Information, realize the inquiry of access side to power-supply device with the power-supply device communication; Control information sends power-supply device to, realizes the control of access side to power-supply device.
Described generation relevant information is meant: can generate output voltage, output frequency, power output percentage, built-in temperature, cell voltage, city's electrical anomaly, bypass, overload, connection access failure, out of Memory etc., and the transmission to described every relevant information can be selected as required, preestablishes.
Described set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, connecting called phone by this telephone number carries out power-supply device information and transmits and be meant: can set in advance a plurality of be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, can circulate successively to dial to these telephone numbers and cry, carry out power-supply device information and transmit; Described called phone can be generic linear phone, mobile phone or beeper.
Described access side can adopt the arbitrary communication terminal that is on the communication network, by with the corresponding telephone number in power-supply device geographical position, at least send information and obtain the power-supply device state information to power-supply device through common telephone network and be meant: the access side can adopt and be in plain old telephone online arbitrary voice terminal or digital terminal, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network;
The access side also can adopt and be in radio communication online arbitrary voice terminal or digital terminal, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through wireless communication networks and common telephone network;
Described the information that transmits from common telephone network is carried out cryptographic check, can accept the information that transmits from common telephone network after the verification succeeds, this information is handled back generated query information and control information to be meant: after access side and accessed power-supply device are set up communication contact, point out the information of input password to the access side, can further can carry out the information of function selecting after the cryptographic check success to access side's prompting, this alternative information comprises: status poll information, powered-down facility information, modification information, detection information, withdraw from information etc.;
Information after the selection that acceptance is transmitted from common telephone network operates after this information handled accordingly.
Described a kind of power-supply device method for supervising based on common telephone network, its step can further comprise:
Gather the power-supply device running state data in real time;
This power-supply device running state data is handled, can generate output voltage, output frequency, power output percentage, built-in temperature, cell voltage, city's electrical anomaly, battery pack low-voltage, bypass, overload, connection access failure, other information etc., and the transmission to described every information can be selected as required, preestablishes;
Can set in advance a plurality of be in plain old telephone online by the telephone number of called telephone, when power-supply device need transmit information, can circulate successively to dial to these telephone numbers and cry, up to user's off-hook and import proper password or power-supply device withdraws from delivery status; Power-supply device can be voice and transmits when transmitting information;
The access side can adopt and be in the online arbitrary telephone set of plain old telephone, keys in and the corresponding telephone number in power-supply device geographical position, sets up communication contact by common telephone network and this power-supply device;
After access side and accessed power-supply device are set up communication contact, information to access side's voice suggestion input password, can further can carry out the information of function selecting after the cryptographic check success to access side's voice suggestion, this alternative information comprises: status poll information, close UPS information, modification information, detection information, withdraw from information etc., described these alternative information telephone key-press with the access side respectively are corresponding one by one, and the access side can key in corresponding information;
Accept the interview information after the selection that square key is gone into, that transmit from common telephone network carries out operating accordingly with described alternative information after this information handled.
A kind of power-supply device supervising device based on common telephone network, comprising: single-chip microcomputer, communication interface, ringtone detection device, simulation offhook device, coding and decoding device;
Single-chip microcomputer connects with communication interface and communicates by letter with power-supply device by communication interface;
Single-chip microcomputer connects with the simulation offhook device, and the simulation offhook device connects with common telephone network, and Single-chip Controlling simulation offhook device inserts common telephone network, and realization is communicated by letter with common telephone network;
Single-chip microcomputer connects with coding and decoding device, and coding and decoding device connects with common telephone network, and the Single-chip Controlling coding and decoding device is sent telephone number into common telephone network, realizes the calling to described telephone number counterpart telephone set;
Single-chip microcomputer connects with ringtone detection device, ringtone detection device connects with common telephone network, the Single-chip Controlling ringtone detection device detects the bell signal on the telephone wire, Single-chip Controlling simulation offhook device inserts common telephone network, realization is to from online the replying of calling out of plain old telephone, and communicates with common telephone network.
Described device also can comprise voice device;
Single-chip microcomputer connects with voice device, and voice device connects with common telephone network, and Single-chip Controlling voice device and common telephone network communicate, and realizes voice suggestion.
Described single-chip microcomputer can comprise: enquiry module, modified module, control module, test module.
Described communication interface comprises: 232 interfaces, 485 interfaces, USB interface, telephone line interface;
Wherein, single-chip microcomputer connects with serial line interface, and communicates by letter with power-supply device by serial line interface;
Telephone line interface connects with common telephone network, and the realization single-chip microcomputer is communicated by letter with common telephone network.
Described common telephone network comprises: cable telephone network, radiotelephony network.
Described power-supply device can be UPS.
Beneficial effect of the present invention is: by a kind of power-supply device method for supervising and device based on common telephone network is provided, make dependence to computer and internet is completely free of in the monitoring of power-supply device, and it is simple in structure, cost is low, and be not subjected to the limitation of network, can be subjected to the attack of " hacker ".When power-supply device need transmit information, the personnel that need not on duty just can be at any time and any place, (can be identified) information delivery timely and effectively, make the relevant information of power-supply device in time to be transmitted.The present invention can also realize active monitoring, the remote monitoring to power-supply device by the method for active inquiry whenever and wherever possible, and simple to operate.Help management, reduced the economic loss that causes because of power-supply device mismanagement greatly, obtained good economic benefit power-supply device.
Description of drawings
Fig. 1 is the structured flowchart of device of the present invention;
Fig. 2 is the circuit theory diagrams of device of the present invention.
Embodiment
In conjunction with Fig. 1 the specific embodiment of the present invention is described below: (annotate: the power-supply device described in the following embodiment, can ups power be example)
The visitor utilizes the online telephone set of plain old telephone to connect the online monitor terminal of plain old telephone that coexists;
This monitor terminal detects the online bell signal of plain old telephone by its microprocessor that is loaded with, and control simulation circuit for answering, connects access side's telephone set, and opens sound circuit, requires access side's key feeding cipher with voice mode;
After password is identified, this monitor terminal is pointed out selection function key with voice mode to the visitor, the function that each key is corresponding respectively on the telephone set can comprise: parameter modification, power-supply device state information searching, power-supply device state verification, powered-down equipment and log off etc., and the visitor keys in instruction according to prompting and self needs;
This monitor terminal links by its communication interface that is loaded with and power-supply device, gathers the power-supply device status data in real time; The power-supply device state information is handled and generated to monitor terminal by the microprocessor that it is loaded with to the data of being gathered, and this microprocessor also can send instruction to power-supply device;
The command information that the visitor keys in sends the microprocessor of monitor terminal to after decoding, microprocessor is operated accordingly according to the command information of being received, corresponding operation comprises: voice suggestion is revised information and is accepted modification information, voice report Query Information, power-supply device is tested and voice report detecting information; Powered-down equipment and log off etc.;
When power-supply device breaks down, described monitor terminal generates fault alarm information by its microprocessor that is loaded with and control simulation circuit for answering is connected the online appointed telephone set of plain old telephone, wherein: the user can pass through the inquiry mode presetting number of cell phone earlier, running parameter is set, select required alarm condition, when power-supply device enters alarm condition, monitor terminal will dial by presetting number of cell phone, to hear the voice suggestion of power-supply device fault behind user's off-hook, behind user's input validation password, monitor terminal stops dialing, if the user does not correctly input password, the monitor terminal dialing that will circulate successively to default multiple groups of phone numbers is till user's input validation password or power-supply device withdraw from alarm condition.
Inquiry mode wherein can further specify for: the user dials device of the present invention position telephone number, puts through the back by voice promptings, and the input password is after the affirmation.Press voice prompting selection function key.Button " 1 " is revised password; Button " 2 " is revised telephone number; Button " 3 " is revised identification number; Button " 4 " is revised identification number; Button " 5 ", status poll; Button " 6 ", powered-down equipment; Button " 7 ", the power-supply device test; Button " # " logs off.
Monitor mode wherein can further specify for: the user at first is provided with telephone number (can establish 5 groups) by inquiry mode, and running parameter is set, and selects required alarm condition (to comprise city's electrical anomaly, the battery pack low-voltage, bypass, overload, connection does not connect, fault).In case power-supply device enters alarm condition, device of the present invention will dial by presetting number of cell phone, to hear the voice suggestion of power-supply device fault behind user's off-hook, after user's input " affirmation password ", device of the present invention stops dialing, if the user correctly do not input password, device of the present invention will be to the dialing that circulates successively of 5 groups of telephone numbers, imports " affirmation password " or power-supply device withdraws from alarm condition up to the user.
Operation principle wherein can further specify into:
Device of the present invention is realized and extraneous communication with voice mode by telephone wire by interfaces such as R232 serial line interface, 485 interfaces, USB monitoring power-supply device operating state.Circuit comprises ring detecting circuit; The simulation circuit for answering; Sound circuit; Double-tone is coding-decoding circuit frequently; Single-chip microcomputer five parts.When device of the present invention was operated in inquiry mode, after single-chip microcomputer detected bell signal on the telephone wire by ring detecting circuit, control simulation circuit for answering inserted telephone network with device of the present invention; Open sound circuit with information and power-supply device operating state, give the visitor by telephone wire with voice mode; Visitor's " key information " given single-chip microcomputer after being decoded by double-tone frequency decoding circuit, and single-chip microcomputer is finished corresponding operating according to the information that receives.When device of the present invention was operated in monitor mode, single-chip microcomputer inserted telephone network by control simulation circuit for answering with device of the present invention; By the double audio coding circuit telephone number is sent into telephone network; Single-chip microcomputer is opened sound circuit after judging closing of the circuit, gives those who answer with power-supply device malfunction and information of voice prompt; After those who answer inputed password, device of the present invention changed the status poll mode over to.
The present invention is by providing a kind of power-supply device method for supervising and device based on common telephone network (wired or wireless), make dependence to computer and internet is completely free of in the monitoring of power-supply device, and it is simple in structure, cost is low, and be not subjected to the limitation of network, can be subjected to the attack of " hacker ".When power-supply device need transmit information, the personnel that need not on duty just can be at any time and any place, (can be identified) information delivery timely and effectively, make the relevant information of power-supply device in time to be transmitted.The present invention can realize active monitoring, the remote monitoring to power-supply device by the method for active inquiry whenever and wherever possible, and it is simple to operate, help management, reduced the economic loss that causes because of power-supply device mismanagement greatly, obtained good economic benefit power-supply device.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (15)
1. the power-supply device method for supervising based on common telephone network is characterized in that, gathers the power-supply device running state data in real time, these data are handled, generate relevant information, this information is sent by common telephone network, realize that the information of power-supply device transmits;
The information that reception is transmitted from common telephone network, this information that transmits is handled, generated query information and control information, through being returned to common telephone network by Query Information with the power-supply device communication, realization is to the inquiry of power-supply device running status, send control information to power-supply device, realize control power-supply device;
Described relevant information is sent by common telephone network is meant: set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device need transmission information goes out, connect called phone by this telephone number.
2. method according to claim 1, it is characterized in that, described reception is meant from the information that common telephone network transmits: adopt the arbitrary communication terminal that is on the communication network, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network at least.
3. method according to claim 1, it is characterized in that, described this information that transmits is handled, generated query information and control information are meant: the information that transmits from common telephone network is carried out cryptographic check, the information that acceptance is transmitted from common telephone network after the verification succeeds, this information is handled back generated query information and control information, and through being returned to common telephone network by Query Information with the power-supply device communication, control information sends power-supply device to.
4. method according to claim 1, its step comprises:
Gather the power-supply device running state data in real time;
This power-supply device running state data is handled, generated relevant information;
Set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device breaks down, connect called phone by this telephone number and carry out power-supply device information and transmit;
The access side adopts the arbitrary communication terminal be on the communication network, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network at least;
The information that transmits from common telephone network is carried out cryptographic check, the information that acceptance is transmitted from common telephone network after the verification succeeds, this information is handled back generated query information and control information, through being returned to common telephone network by Query Information, realize the inquiry of access side to power-supply device with the power-supply device communication; Control information sends power-supply device to, realizes the control of access side to power-supply device.
5. method according to claim 4, it is characterized in that, described generation relevant information is meant: the information that generates output voltage, output frequency, power output percentage, cell voltage, built-in temperature, city's electrical anomaly, bypass, overload, connection access failure, and the transmission to described every information can be selected as required, preestablishes.
6. method according to claim 4, it is characterized in that, described set in advance at least one be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, connecting called phone by this telephone number carries out power-supply device information and transmits so be meant: set in advance a plurality of be on the communication network by the telephone number of called telephone, when power-supply device need transmit information, these telephone numbers are circulated to dial successively cry, carry out power-supply device information and transmit; Described called phone is generic linear phone, mobile phone or beeper.
7. method according to claim 4, it is characterized in that, described access side adopts the arbitrary communication terminal that is on the communication network, by with the corresponding telephone number in power-supply device geographical position, at least send information and obtain the power-supply device state information to power-supply device through common telephone network and be meant: the access side adopts and is in plain old telephone online arbitrary voice terminal or digital terminal, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through common telephone network;
The access side also adopts and is in radio communication online arbitrary voice terminal or digital terminal, by with the corresponding telephone number in power-supply device geographical position, set up communication contact with this power-supply device, send information and obtain the power-supply device state information to power-supply device through wireless communication networks and common telephone network.
8. method according to claim 4, it is characterized in that, described the information that transmits from common telephone network is carried out cryptographic check, the information that acceptance is transmitted from common telephone network after the verification succeeds, this information is handled back generated query information and control information to be meant: after access side and accessed power-supply device are set up communication contact, point out the information of input password to the access side, further can carry out the information of function selecting after the cryptographic check success to access side's prompting, this alternative information comprises: status poll information, the powered-down facility information, modification information, detection information, withdraw from information;
Information after the selection that acceptance is transmitted from common telephone network operates after this information handled accordingly.
9. method according to claim 4, its step further comprises:
Gather the power-supply device running state data in real time;
This power-supply device running state data is handled, generate the information of output voltage, output frequency, power output percentage, cell voltage, built-in temperature, city's electrical anomaly, bypass, overload, connection access failure, and the transmission to described every relevant information can be selected as required, preestablishes;
Set in advance a plurality of be in plain old telephone online by the telephone number of called telephone, when power-supply device need transmit information, these telephone numbers are circulated to dial successively cry, up to user's off-hook and import proper password or power-supply device withdraws from information transfer state; Power-supply device information is that voice transmit when transmitting;
The access side adopts and is in the online arbitrary telephone set of plain old telephone, keys in and the corresponding telephone number in power-supply device geographical position, sets up communication contact by common telephone network and this power-supply device;
After access side and accessed power-supply device are set up communication contact, information to access side's voice suggestion input password, further can carry out the information of function selecting after the cryptographic check success to access side's voice suggestion, this alternative information comprises: status poll information, powered-down facility information, modification information, detection information, withdraw from information, described these alternative information telephone key-press with the access side respectively are corresponding one by one, and the access side keys in corresponding information;
Accept the interview information after the selection that square key is gone into, that transmit from common telephone network carries out operating accordingly with described alternative information after this information handled.
10. power-supply device supervising device based on common telephone network, comprising: single-chip microcomputer, communication interface, ringtone detection device, simulation offhook device, coding and decoding device;
Single-chip microcomputer connects with communication interface and communicates by letter with power-supply device by communication interface;
Single-chip microcomputer connects with the simulation offhook device, and the simulation offhook device connects with common telephone network, and Single-chip Controlling simulation offhook device inserts common telephone network, and realization is communicated by letter with common telephone network;
Single-chip microcomputer connects with coding and decoding device, and coding and decoding device connects with common telephone network, and the Single-chip Controlling coding and decoding device is sent telephone number into common telephone network, realizes the calling to described telephone number counterpart telephone set;
Single-chip microcomputer connects with ringtone detection device, ringtone detection device connects with common telephone network, the Single-chip Controlling ringtone detection device detects the bell signal on the telephone wire, Single-chip Controlling simulation offhook device inserts common telephone network, realization is to from online the replying of calling out of plain old telephone, and communicates with common telephone network.
11. device according to claim 10 is characterized in that, described device also comprises voice device; Single-chip microcomputer connects with voice device, and voice device connects with common telephone network, and Single-chip Controlling voice device and common telephone network communicate, and realizes voice suggestion.
12., it is characterized in that described single-chip microcomputer comprises: enquiry module, modified module, control module, test module according to claim 10 or 11 described devices.
13. according to claim 10 or 11 described devices, it is characterized in that described communication interface comprises: 232 interfaces, 485 interfaces, USB interface or telephone line interface;
Wherein, single-chip microcomputer connects with serial line interface, and communicates by letter with power-supply device by serial line interface;
Telephone line interface connects with common telephone network, and the realization single-chip microcomputer is communicated by letter with common telephone network.
14., it is characterized in that described power-supply device is UPS according to claim 10 or 11 described devices.
15. device according to claim 13 is characterized in that, described common telephone network comprises: cable telephone network, radiotelephony network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021241473A CN1326359C (en) | 2002-07-12 | 2002-07-12 | Power supply apparatus monitoring method and equipment based on common telephone network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021241473A CN1326359C (en) | 2002-07-12 | 2002-07-12 | Power supply apparatus monitoring method and equipment based on common telephone network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1467949A CN1467949A (en) | 2004-01-14 |
| CN1326359C true CN1326359C (en) | 2007-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021241473A Expired - Fee Related CN1326359C (en) | 2002-07-12 | 2002-07-12 | Power supply apparatus monitoring method and equipment based on common telephone network |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102288799A (en) * | 2010-06-18 | 2011-12-21 | 黄金富 | Mobile electric meter system and method for carrying out charging by using China mobile telephone network |
| CN102339119B (en) * | 2011-07-14 | 2014-05-07 | 广州美电贝尔电业科技有限公司 | Intelligent monitoring device for a power supply |
| CN103197649B (en) * | 2013-04-07 | 2015-09-02 | 余俊威 | A kind of acquisition controller and supervisory system thereof |
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| US4465967A (en) * | 1981-01-28 | 1984-08-14 | Hitachi, Ltd. | Current supply circuit |
| CN1132427A (en) * | 1995-03-25 | 1996-10-02 | 江苏苏电自控电器厂 | Wired transmission intelligence power consumption metering controlling instrument |
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| CN1467949A (en) | 2004-01-14 |
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