CN104735886A - Streetlamp phase detecting method - Google Patents
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Abstract
The invention relates to the field of intelligent streetlamps, in particular to a streetlamp phase detecting method. The method includes: an integrated controller detects the zero crossing point of the A phase of a three-phase power supply circuit; the integrated controller transmits a phase detecting data frame to the single-lamp controller of each first-level streetlamp node so as to detect and collect the phase where the single-lamp controller of each first-level streetlamp node is located; the integrated controller transmits a phase detecting data frame to the single-lamp controller of each second-level streetlamp node so as to detect and collect the phase where the single-lamp controller of each second-level streetlamp node is located; ...; the integrated controller transmits a phase detecting data frame to the single-lamp controller of each N-level streetlamp node so as to detect and collect the phase where the single-lamp controller of each N-level streetlamp node is located. By the streetlamp phase detecting method widely applicable to streetlamp intelligent management, the phase where each streetlamp in a streetlamp network is located can be automatically detected.
Description
Technical field
The present invention relates to intelligent road-lamp field, particularly a kind of street lamp method for detecting phases.
Background technology
In street lamp installation process, installation personnel needs to ensure that street lamp can be distributed in each phase of three-phase power line equably as far as possible, otherwise can cause the adverse consequencess such as power consumption efficiency reduces, street lamp uneven illumination is even.
Summary of the invention
Automatically detecting the technical problem of each street lamp place phase place in order to solve streetlamp management system, the present invention proposes a kind of street lamp method for detecting phases, comprising the steps:
S1, Centralized Controller detects the zero crossing of the A phase in three-phase power line; Single-lamp controller detects its place and to power the zero crossing of phase;
S2, occur by during just to negative zero passage in A phase, Centralized Controller sends phase-detection Frame to the single-lamp controller of all one-level street-lamp nodes;
S3, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, the single-lamp controller of the time point in the phase-detection Frame received and this one-level street-lamp node is detected by just comparing to zero-crossing timing point during negative zero passage, obtain the accumulative zero crossing time difference, the single-lamp controller place phase place of this one-level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0, 3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this one-level street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 240 degree,
S4, Centralized Controller sends phase-detection Frame by the single-lamp controller of each one-level street-lamp node to the single-lamp controller of all secondary street-lamp nodes;
S5, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, detected by the single-lamp controller calculating this one-level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this one-level street-lamp node zero passage, the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends be this one-level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain secondary street-lamp node that the single-lamp controller of this one-level street-lamp node is administered receives this one-level street-lamp node sends, according to the single-lamp controller of this secondary street-lamp node detect by just to zero-crossing timing point during negative zero passage and this one-level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all secondary street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this one-level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this secondary street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this secondary street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this secondary street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 240 degree,
S6, by that analogy, Centralized Controller by the single-lamp controller of each one-level street-lamp node, each secondary street-lamp node single-lamp controller ..., each N-1 level street-lamp node single-lamp controller send phase-detection Frame to the single-lamp controller of all N level street-lamp nodes;
S7, after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N-1 level street-lamp node receives the N-2 level street-lamp node belonging to it sends, detected by the single-lamp controller calculating this N-1 level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this N-1 level street-lamp node zero passage, the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends be this N-1 level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N level street-lamp node that the single-lamp controller of this N-1 level street-lamp node is administered receives this N-1 level street-lamp node sends, according to the single-lamp controller of this N level street-lamp node detect by just to zero-crossing timing point during negative zero passage and this N-1 level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all N level street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this N-1 level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this N level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this N level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this N level street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 240 degree.
Street lamp method for detecting phases of the present invention, can detect the phase place at each street lamp place in road lamp network automatically; If streetlamp management system finds that the street lamp in road lamp network is too uneven in the distribution of each phase, can report to the police; Street lamp method for detecting phases of the present invention is widely used in the intelligent management of street lamp.
Accompanying drawing explanation
Fig. 1 is road lamp network schematic diagram.
Fig. 2 is the flow chart of the street lamp method for detecting phases of the embodiment of the present invention 1.
Embodiment
Street lamp method for detecting phases of the present invention is described in detail below in conjunction with accompanying drawing.
Road lamp network as shown in Figure 1.
Embodiment 1
As shown in Figure 2, street lamp method for detecting phases of the present invention, comprises the steps:
S1, Centralized Controller detects the zero crossing of the A phase in three-phase power line; Single-lamp controller detects its place and to power the zero crossing of phase;
S2, occur by during just to negative zero passage in A phase, Centralized Controller sends phase-detection Frame to detect, to collect the phase place at the single-lamp controller place of all one-level street-lamp nodes that this Centralized Controller is administered to the single-lamp controller of all one-level street-lamp nodes, in the present invention, the node at the single-lamp controller place with Centralized Controller direct communication is called first nodes, cannot with Centralized Controller direct communication, the node at the single-lamp controller place that only just can need be communicated with Centralized Controller by the single-lamp controller of first nodes is called two-level node, by that analogy, cannot with Centralized Controller direct communication and only need by N-1 level node, N-2 level node, N-3 level node, two-level node, the node at the single-lamp controller place that the single-lamp controller of first nodes just can communicate with Centralized Controller is called N level node,
S3, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, the single-lamp controller of the time point in the phase-detection Frame received and this one-level street-lamp node is detected by just comparing to zero-crossing timing point during negative zero passage, obtain the accumulative zero crossing time difference, the resolution of the described accumulative zero crossing time difference is 0.1 millisecond; For the electric power system of 50Hz, the accumulative zero crossing time difference often just deducts 20 milliseconds with back to zero more than 20 milliseconds, such as, when the accumulative zero crossing time difference is 23 milliseconds is then 3 milliseconds by its back to zero; For the electric power system of 60Hz, the accumulative zero crossing time difference often just deducts 16.7 milliseconds with back to zero more than 16.7 milliseconds, such as, when the accumulative zero crossing time difference is 17.7 milliseconds is then 1 millisecond by its back to zero; This is a little as clock and watch, and for clock and watch, when adopting 12 hours and make, reading often just deducted 12 with back to zero more than 12 hours, and such as, time reading is 13, we are called 1 point; The single-lamp controller place phase place of this one-level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, shows single-lamp controller and the Centralized Controller homophase of this one-level street-lamp node; If this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 120 degree; If this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 240 degree;
S4, Centralized Controller sends phase-detection Frame to detect, to collect the phase place at the single-lamp controller place of all secondary street-lamp nodes that this Centralized Controller is administered by the single-lamp controller of each one-level street-lamp node to the single-lamp controller of all secondary street-lamp nodes;
S5, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, detected by the single-lamp controller calculating this one-level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this one-level street-lamp node zero passage, the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends be this one-level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain secondary street-lamp node that the single-lamp controller of this one-level street-lamp node is administered receives this one-level street-lamp node sends, according to the single-lamp controller of this secondary street-lamp node detect by just to zero-crossing timing point during negative zero passage and this one-level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all secondary street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this one-level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this secondary street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this secondary street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this secondary street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 240 degree,
S6, by that analogy, Centralized Controller by the single-lamp controller of each one-level street-lamp node, each secondary street-lamp node single-lamp controller ..., each N-1 level street-lamp node single-lamp controller send phase-detection Frame to detect, to collect the phase place at the single-lamp controller place of all N level street-lamp nodes that this Centralized Controller is administered to the single-lamp controller of all N level street-lamp nodes;
S7, after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N-1 level street-lamp node receives the N-2 level street-lamp node belonging to it sends, detected by the single-lamp controller calculating this N-1 level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this N-1 level street-lamp node zero passage, the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends be this N-1 level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N level street-lamp node that the single-lamp controller of this N-1 level street-lamp node is administered receives this N-1 level street-lamp node sends, according to the single-lamp controller of this N level street-lamp node detect by just to zero-crossing timing point during negative zero passage and this N-1 level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all N level street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this N-1 level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this N level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this N level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this N level street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 240 degree.
Described phase-detection Frame comprises communication frame head part, phase-detection command word part, accumulative zero crossing time difference part and communication frame portion.Communication frame head part comprises start-of-frame part, destination address part and source address portion.Described communication frame portion is CRC test value.
Described street lamp method for detecting phases can also comprise the steps:, after Centralized Controller collects the phase place at the single-lamp controller place of all street-lamp nodes at different levels that it is administered, to calculate the street lamp quantity in each phase; If the street lamp in discovery road lamp network is too uneven in the distribution of each phase, then can report to the police.
Claims (8)
1. a street lamp method for detecting phases, is characterized in that, comprises the steps:
S1, Centralized Controller detects the zero crossing of the A phase in three-phase power line; Single-lamp controller detects its place and to power the zero crossing of phase;
S2, occur by during just to negative zero passage in A phase, Centralized Controller sends phase-detection Frame to the single-lamp controller of all one-level street-lamp nodes;
S3, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, the single-lamp controller of the time point in the phase-detection Frame received and this one-level street-lamp node is detected by just comparing to zero-crossing timing point during negative zero passage, obtain the accumulative zero crossing time difference, the single-lamp controller place phase place of this one-level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0, 3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this one-level street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this one-level street-lamp node differs with Centralized Controller is 240 degree,
S4, Centralized Controller sends phase-detection Frame by the single-lamp controller of each one-level street-lamp node to the single-lamp controller of all secondary street-lamp nodes;
S5, after the single-lamp controller of certain one-level street-lamp node receives the phase-detection Frame that Centralized Controller sends, detected by the single-lamp controller calculating this one-level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this one-level street-lamp node zero passage, the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all secondary street-lamp nodes that the single-lamp controller of this one-level street-lamp node is administered to it sends be this one-level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain secondary street-lamp node that the single-lamp controller of this one-level street-lamp node is administered receives this one-level street-lamp node sends, according to the single-lamp controller of this secondary street-lamp node detect by just to zero-crossing timing point during negative zero passage and this one-level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all secondary street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this one-level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this secondary street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this secondary street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this secondary street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this secondary street-lamp node differs with Centralized Controller is 240 degree,
S6, by that analogy, Centralized Controller by the single-lamp controller of each one-level street-lamp node, each secondary street-lamp node single-lamp controller ..., each N-1 level street-lamp node single-lamp controller send phase-detection Frame to the single-lamp controller of all N level street-lamp nodes;
S7, after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N-1 level street-lamp node receives the N-2 level street-lamp node belonging to it sends, detected by the single-lamp controller calculating this N-1 level street-lamp node by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; When this N-1 level street-lamp node zero passage, the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends phase-detection Frame, the accumulative zero crossing time difference in the phase-detection Frame that the single-lamp controller of all N level street-lamp nodes that the single-lamp controller of this N-1 level street-lamp node is administered to it sends be this N-1 level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point during negative zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage; after the phase-detection Frame that the single-lamp controller that the single-lamp controller of certain N level street-lamp node that the single-lamp controller of this N-1 level street-lamp node is administered receives this N-1 level street-lamp node sends, according to the single-lamp controller of this N level street-lamp node detect by just to zero-crossing timing point during negative zero passage and this N-1 level street-lamp node single-lamp controller detected by the phase-detection Frame sent by the single-lamp controller of all N level street-lamp nodes of just administer to the single-lamp controller crossing zero time difference and this N-1 level street-lamp node of zero-crossing timing point during negative zero passage to it in the accumulative zero crossing time difference calculate this N level street-lamp node single-lamp controller detected by by just to detected by zero-crossing timing point when bearing zero passage and Centralized Controller by just to the accumulative zero crossing time difference zero-crossing timing point when bearing zero passage, the single-lamp controller place phase place of this N level street-lamp node is gone out: if this accumulative zero crossing time difference is [16.7 according to this accumulative zero crossing step-out time analysis, 20] and [0,3.3] millisecond is interval, show single-lamp controller and the Centralized Controller homophase of this N level street-lamp node, if this accumulative zero crossing time difference (3.3,10] millisecond is interval, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 120 degree, if this accumulative zero crossing time difference is interval at (10,16.7) millisecond, showing that the single-lamp controller of this N level street-lamp node differs with Centralized Controller is 240 degree.
2. street lamp method for detecting phases as claimed in claim 1, it is characterized in that, the resolution of the described accumulative zero crossing time difference is 0.1 millisecond.
3. street lamp method for detecting phases as claimed in claim 1, it is characterized in that, the method for described accumulative zero crossing time difference back to zero is: for the electric power system of 50Hz, and the accumulative zero crossing time difference often just deducts 20 milliseconds with back to zero more than 20 milliseconds.
4. street lamp method for detecting phases as claimed in claim 1, it is characterized in that, the method for described accumulative zero crossing time difference back to zero is: for the electric power system of 60Hz, and the accumulative zero crossing time difference often just deducts 16.7 milliseconds with back to zero more than 16.7 milliseconds.
5. the street lamp method for detecting phases as described in Claims 1-4 any one, is characterized in that, described phase-detection Frame comprises communication frame head part, phase-detection command word part, accumulative zero crossing time difference part and communication frame portion.
6. street lamp method for detecting phases as claimed in claim 5, it is characterized in that, described communication frame head part comprises start-of-frame part, destination address part and source address portion.
7. street lamp method for detecting phases as claimed in claim 5, it is characterized in that, described communication frame portion can be CRC test value.
8. street lamp method for detecting phases as claimed in claim 5, it is characterized in that, described street lamp method for detecting phases can also comprise the steps:, after Centralized Controller collects the phase place at the single-lamp controller place of all street-lamp nodes at different levels that it is administered, to calculate the street lamp quantity in each phase; If the street lamp in discovery road lamp network is too uneven in the distribution of each phase, then can report to the police.
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| CN111954357A (en) * | 2020-08-12 | 2020-11-17 | 烽火通信科技股份有限公司 | Time synchronization method and system for NB-IoT street lamp single lamp controller |
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| CN111954357A (en) * | 2020-08-12 | 2020-11-17 | 烽火通信科技股份有限公司 | Time synchronization method and system for NB-IoT street lamp single lamp controller |
| CN111954357B (en) * | 2020-08-12 | 2022-09-16 | 烽火通信科技股份有限公司 | Time synchronization method and system for NB-IoT street lamp single lamp controller |
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| CN104735886B (en) | 2017-05-17 |
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