CN104299480B - Intelligent switch and control method, intelligent control network - Google Patents
Intelligent switch and control method, intelligent control network Download PDFInfo
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- CN104299480B CN104299480B CN201310274443.5A CN201310274443A CN104299480B CN 104299480 B CN104299480 B CN 104299480B CN 201310274443 A CN201310274443 A CN 201310274443A CN 104299480 B CN104299480 B CN 104299480B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
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Abstract
The present invention relates to a kind of intelligent switch and control method, intelligent control network.This control method includes: obtain the control instruction of controlled load；Detection is passed through the instantaneous value of the alternating current of the relay that controlled load connects；The frequency of described alternating current is determined according to described instantaneous value relation over time, and by the time point of this frequency acquisition zero-crossing of alternating current；Time point according to zero-crossing of alternating current and actuating of relay time delay, determine the time point controlling the actuating of relay；According to the time point of the described control actuating of relay, control the actuating of relay.The present invention can not only effectively protective relay and intelligent switch, extend relay and intelligent switch life-span, and the time controlling the actuating of relay can be determined for the action that relay is intrinsic time delay flexibly, therefore can realize the self adaptation to different relays.
Description
Technical field
The present invention relates to switching technique field, particularly relate to a kind of intelligent switch and control method thereof,
Intelligent control network.
Background technology
In on-off control field, generally by driving the actuating of relay to control the open and close of load, continue
Electrical equipment, in Guan Bi or the moment of disconnection, often produces bigger surge voltage, relay is caused damage
Bad, the life-span causing relay or the electrical switch with relay is shorter.
Summary of the invention
Brief overview about the present invention given below, in order to some side about the present invention is provided
The basic comprehension in face.Should be appreciated that this general introduction is not that the exhaustive about the present invention is summarized.It
It is not intended to determine the key of the present invention or pith, is not the model of the intended limitation present invention
Enclose.Its purpose is only to provide some concept in simplified form, more detailed in this, as discuss after a while
The thin preamble described.
The present invention provides a kind of intelligent switch and control method, intelligent control network, it is possible to effectively protect
Protect relay and intelligent switch, extend relay and intelligent switch life-span.
On the one hand, the present invention provides a kind of intelligent switch, including:
At least one relay, is used for connecting load；
Detection device, is passed through the instantaneous value of the alternating current of the relay that controlled load connects for detection；
Acquisition module, including for determining described exchange according to described instantaneous value relation over time
The frequency acquisition module of the frequency of electricity, and for by the time of this frequency acquisition zero-crossing of alternating current
The time-obtaining module of point；
Time Calculation module, when the time point according to zero-crossing of alternating current and the actuating of relay postpone
Between, calculate the time point controlling the actuating of relay；
Controller, controls the actuating of relay for the time point according to described control relay.
On the other hand, the invention provides a kind of intelligent control network, including above-mentioned intelligent switch, institute
State intelligent switch connection and have load.
On the other hand, the present invention also provides for the control method of a kind of intelligent switch, including:
Obtain the control instruction of controlled load；
Detection is passed through the instantaneous value of the alternating current of the relay that controlled load connects；
The frequency of described alternating current is determined according to described instantaneous value relation over time, and by being somebody's turn to do
The time point of frequency acquisition zero-crossing of alternating current；
Time point according to zero-crossing of alternating current and actuating of relay time delay, determine control relay
The time point of action；
According to the time point of the described control actuating of relay, control the action of relay.
In the technical scheme that the present invention provides, it is passed through and the controlled relay loading and being connected by detection
The instantaneous value of alternating current, and the frequency of alternating current is determined according to the time dependent relation of instantaneous value of detection
Rate, owing to can determine the time point of zero-crossing of alternating current, and according to alternating current mistake according to ac frequency
The time point of zero point and actuating of relay time delay, calculate the time point controlling relay, therefore
When receiving the control instruction for controlling load, relay, example can be controlled at suitable time point
As controlled the actuating of relay before zero crossing so that relay just action near zero point phase place,
Effectively protective relay is not by heavy current impact, and cost is relatively low.Therefore, this programme can not only have
Effect protective relay and intelligent switch, extend relay and intelligent switch life-span, and can be for continuing
Electrical equipment determines the time point controlling the actuating of relay flexibly at intrinsic action time delay, therefore can realize
Self adaptation to different relays.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below by right
In embodiment or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that,
Accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art
From the point of view of, on the premise of not paying creative work, it is also possible to obtain the attached of other according to these accompanying drawings
Figure.
The block diagram of a kind of intelligent switch that Fig. 1 provides for the embodiment of the present invention one；
Fig. 2 is the phase curve figure of the alternating current that the present invention obtains according to the instantaneous value of alternating current；
The block diagram of a kind of intelligent control network that Fig. 3 provides for the embodiment of the present invention two；
The flow chart of the control method of a kind of intelligent switch that Fig. 4 provides for the embodiment of the present invention three.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with this
Accompanying drawing in inventive embodiments, clearly and completely retouches the technical scheme in the embodiment of the present invention
State, it is clear that described embodiment is a part of embodiment of the present invention rather than whole embodiments.
Element described in the accompanying drawing of the present invention or a kind of embodiment and feature can with one or
Element shown in other accompanying drawings more or embodiment and feature combine.It should be noted that, in order to
Clearly purpose, accompanying drawing and explanation eliminate unrelated to the invention, those of ordinary skill in the art
Known parts and the expression of process and description.Based on the embodiment in the present invention, the common skill in this area
All other embodiments that art personnel are obtained on the premise of not paying creative work, broadly fall into
The scope of protection of the invention.
Embodiment one
The block diagram of a kind of intelligent switch that Fig. 1 provides for the embodiment of the present invention one.This intelligent switch connects
Having load, it is specifically for controlling the state of load, in a kind of optional structure, on this intelligent switch
Can be provided with local input module, this local input module can include, such as, is arranged on this intelligent switch
Upper, for controlling to be connected to the button of the load of this intelligent switch；Also can be provided with such as on intelligent switch,
Remote communication module, for remotely receiving control instruction from other intelligent switch, so that this intelligent switch
Control to be connected to the state of its load.
As it is shown in figure 1, the intelligent switch that the present embodiment provides includes: at least one relay 12,
Detection device 14, acquisition module 16, Time Calculation module 18 and controller 19, acquisition module
16 are connected with detection device 14 and Time Calculation module 18, Time Calculation module 18 and controller
19 connect.Controller 19 specifically can be connected with relay 12 by drive circuit.This at least one
Relay 12 is used for connecting load, and when needing the state changing a certain load, controller can be at this
Under the triggering triggering control instruction that is lower or that remotely receive of ground button, control to connect controlled load
Relay 12 action.The actuating of relay, specifically can include that controlling relay is opened or closed.Above-mentioned
Controlled load refers to, the load corresponding with the control instruction that controller 19 obtains.Above-mentioned acquisition module
16, Time Calculation module 18 can integrate with controller 19.
Such as, can come to controller by triggering the button of corresponding controlled load on this intelligent switch
19 input control instructions.Or, the control instruction that controller 19 can send according to other intelligent switch,
Control the actuating of relay being connected with controlled load.
Detection device 14 is passed through the instantaneous of the alternating current of the relay 12 that controlled load connects for detection
Value, specifically, alternating current is before being passed through relay, and device 14 detects its instantaneous value the most after testing.
Acquisition module 16 includes frequency acquisition module 162, for the wink of receiving detection device 14 detection
Duration.Frequency acquisition module 162 is for determining alternating current according to instantaneous value relation over time
Frequency.
Acquisition module 16 also includes time-obtaining module 164, for by frequency acquisition module 162
The time point of the frequency acquisition zero-crossing of alternating current obtained.
Time Calculation module 18 is used for, and time point and the actuating of relay according to zero-crossing of alternating current prolong
Time late, calculate the time point controlling relay.Above-mentioned " controlling the time point of relay " can refer to,
Such as, send, to relay, the time being used for driving the signal of the actuating of relay rather than relay is real
The time of border action.
Controller 19 is used for, and controls the actuating of relay according to the time point of described control relay.Control
Device 19 processed specifically for: controlled before the time point of zero-crossing of alternating current controlled load connect continue
Electrical equipment action, wherein the difference of the time of the time point of the time point of zero crossing and control relay is, quilt
Control loads the action time delay that the relay connected is intrinsic, i.e. controller 19 is by alternating current zero passage
The time point of point deducts actuating of relay time delay, as the time point controlling relay.Such as,
If action time delay of the relay 12 being connected with current controlled load is t millisecond, exchange
Electricity zero crossing time point is t0, then controller 19 is when (t0-t), sends and controls this relay
The control signal of device 12 action, after relay is triggered, through the time delay of intrinsic t millisecond, can
Just at the t0 moment, the namely time point of zero-crossing of alternating current, disconnect according to this control instruction
Or Guan Bi.In this way, it is ensured that relay action when the instantaneous value minimum of alternating current.
In such scheme, it is passed through the instantaneous of the alternating current of relay that is connected with controlled load by detection
Value, and determine the frequency of alternating current according to the time dependent relation of instantaneous value of detection, due to can root
The time point of zero-crossing of alternating current is determined according to ac frequency, and according to the time point of zero-crossing of alternating current
With actuating of relay time delay, calculate the time point controlling relay, therefore receive for
Control load control instruction time, can suitable time point control relay, such as zero crossing it
The front control actuating of relay so that relay just action near zero point phase place, effectively protects relay
Device is not by heavy current impact, and cost is relatively low.Therefore, this programme can not only effective protective relay
And intelligent switch, extend relay and intelligent switch life-span, and can be for intrinsic the moving of relay
Make to determine the time point controlling the actuating of relay flexibly time delay, therefore can realize different relays
Self adaptation.
Above-mentioned " action near zero point phase place " does not implies that, strictly action at zero point phase place,
But allow certain error, it is also possible to action away from the phase point close to zero point.
Further, frequency acquisition module 162 obtains alternating current phases song according to the instantaneous value of alternating current
Line, frequency according to alternating current phases curve acquisition alternating current.The phase curve of alternating current can be fine
Reaction alternating current instantaneous value rule over time, be conducive to quickly determine ac frequency.
Fig. 2 is the phase curve figure of the alternating current that the present invention obtains according to the instantaneous value of alternating current.That is,
Frequency acquisition module 162 can obtain such as figure according to the instantaneous value of the alternating current of detection device 14 detection
Phase curve shown in 2.In Fig. 2, horizontal axis representing time, the longitudinal axis represents curtage amplitude.
As in figure 2 it is shown, the zero point phase place of alternating current, refer to the point that the phase curve of alternating current is compared with transverse axis,
Such as a, b, c, d point；Peak phase, refers at the crest of phase curve of alternating current, such as e, f
At point, or the trough of the phase curve of alternating current, such as g, h point.
Above-mentioned detection device 14 can include photoelectrical coupler, and such as EL(field causes) 817S paster,
Utilize photoelectrical coupler, can implement, detect exactly the instantaneous value of alternating current.
Alternatively, frequency acquisition module 162 obtain alternating current frequency time, specifically for:
At the first phase point that two amplitudes of crest two side draw of alternating current phases curve are equal；
At the second phase point that next two amplitude of crest two side draw of alternating current phases curve are equal；
Take the first time point corresponding to center of said two first phase point line, and described two
The second time point corresponding to individual second phase point line center；
According to the time difference between described second time point and first time point, calculate described alternating current
Frequency.
Next crest above-mentioned refers to, the arbitrary crest after crest between two first phase points,
That is, above-mentioned two crest can be adjacent, it is possible to non-conterminous, as long as can be according to the second time point and first
Time difference between time point obtains the frequency of alternating current.
Such as, frequency acquisition module 162 can be at a crest (such as e point) of alternating current phases curve
Take phase point i on the ascending curve of side, the decline curve of this crest opposite side take phase point j,
Amplitude at phase point i and j is equal, and the line center corresponding t3 moment of phase point i with j.
Further, frequency acquisition module 162 is also on the ascending curve of next crest (such as f point) side
Take phase point k, the decline curve of this next crest opposite side takes phase point l, phase point k and
Amplitude at l is equal, and the line center corresponding t9 moment of phase point k with l.
Then, frequency acquisition module 162 takes t9 moment and the time interval in t3 moment, between this time
Every cycle of alternating current can be represented, seek the inverse in the cycle of alternating current, the frequency of alternating current can be calculated
Rate.
Two phase values equal by taking amplitude respectively in crest both sides, and take these two phase values even
Time point corresponding to line center, make use of the symmetry of phase curve, can obtain frequency more accurately
Value, reduces and individually takes the zero point of phase curve or peak value to calculate the error of ac frequency.
According to the ac frequency obtained, it may be determined that alternating current when zero crossing, such as, determining
After the frequency of alternating current, it may be determined that alternating current will at t11 moment zero crossing, if the action of relay
Time delay is (t11-t10) millisecond, then controller 19 controls the actuating of relay in the t10 moment,
I.e. to relay send control signal, relay under the triggering of this control signal, time delay (t11-
T10) it is opened or closed after millisecond.
Embodiment two
The block diagram of a kind of intelligent control network that Fig. 3 provides for the embodiment of the present invention two.As it is shown on figure 3,
This intelligent control network includes above-mentioned intelligent switch, and this intelligent switch connects load.
The intelligent control network of the present embodiment can include can between multiple intelligent switch, and each intelligent switch
By the way of long-range, send control instruction to the controller 19 of other intelligent switch, and each intelligence is opened
Pass can include that multiple relay, the plurality of relay are connected to different loads, when needs control wherein one
When the state of certain load of individual intelligent switch changes, controller 19 can be at corresponding local keys of key
Obtain control instruction under triggering, or remotely receive corresponding control instruction from other intelligent switch, and
Control corresponding relay 12 so that it is action near the zero point phase place of alternating current.
The operation principle of the intelligent switch that the operation principle of each intelligent switch is a kind of with embodiment is identical, no
Repeating.
The intelligent control network that the present embodiment provides, intelligent switch therein is passed through with controlled by detection
The instantaneous value of the alternating current of the relay that load connects, and the instantaneous value according to detection is time dependent
Relation determines the frequency of alternating current, owing to can determine the time of zero-crossing of alternating current according to ac frequency
Point, and according to the time point of zero-crossing of alternating current and actuating of relay time delay, calculate control and continue
The time point of electrical equipment, therefore when receiving the control instruction for controlling load, can be when suitable
Between point control relay, such as before zero crossing control the actuating of relay so that relay just exists
Action near zero point phase place, effective protective relay is not by heavy current impact, and cost is relatively low.Therefore,
This programme can not only effectively protective relay and intelligent switch, extend relay and intelligent switch longevity
Life, and the control actuating of relay can be determined flexibly time delay for the action that relay is intrinsic
Time point, therefore can realize the self adaptation to different relays.
Embodiment three
The flow chart of the control method of a kind of intelligent switch that Fig. 4 provides for the embodiment of the present invention three.As
Shown in Fig. 4, the method comprises the following steps S41, S43, S45, S47.
Step S41: obtain the control instruction of controlled load；
Step S43: detection is passed through the instantaneous value of the alternating current of the relay that controlled load connects；
Step S45: determine the frequency of described alternating current according to described instantaneous value relation over time,
And by the time point of this frequency acquisition zero-crossing of alternating current；
Step S47: according to the time point of zero-crossing of alternating current and actuating of relay time delay, determine
Control the time point of the actuating of relay；；
Step S49: according to the time point of the described control actuating of relay, controls the actuating of relay.
The effective protective relay of such scheme not by heavy current impact, extend while relay life,
Cost is relatively low, is suitable for different relays.
In step S45, " determine described alternating current according to described instantaneous value relation over time
Frequency " specifically include: according to the instantaneous value acquisition alternating current phases curve of described alternating current, and according to
The frequency of described alternating current phases curve acquisition alternating current.Such as can obtain according to the instantaneous value of alternating current
Alternating current phases curve as shown in Figure 2, to represent alternating current instantaneous value relation over time.
Further, specifically include " according to the frequency of alternating current phases curve acquisition alternating current ":
At the first phase point that two amplitudes of crest two side draw of alternating current phases curve are equal, such as phase
Site i, j；
At the second phase point that next two amplitude of crest two side draw of alternating current phases curve are equal, as
Phase point k, l；
Take the first time point corresponding to center of said two first phase point line, such as t3, with
And the second time point corresponding to said two second phase point line center, such as t9；
According to the time difference between described second time point and first time point, calculate described alternating current
Frequency, as the time difference between t9 and t3 represents the cycle of alternating current, by inverted to the cycle
The frequency of alternating current can be obtained.
Two phase values equal by taking amplitude respectively in crest both sides, and take these two phase values even
Time point corresponding to line center, make use of the symmetry of phase curve, can obtain frequency more accurately
Value, reduces and individually takes the zero point of phase curve or error that peak computational ac frequency brings.
Alternatively, in step S47, " determining the time point controlling the actuating of relay " specifically includes:
The time point of zero-crossing of alternating current is deducted actuating of relay time delay, as controlling the actuating of relay
Time point.
Alternatively, in step S41, obtain the control instruction of controlled load " specifically include: setting
Under the triggering of the button on intelligent switch, obtain the control instruction of controlled load.Alternatively, in step
In rapid S41, obtain the control instruction of controlled load " specifically include: remotely receive other intelligent switch
The control instruction sent.
In the various embodiments described above of the present invention, the sequence number of embodiment and/or sequencing are merely convenient of to be retouched
State, do not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, certain embodiment
In do not have describe in detail part, may refer to the associated description of other embodiments.
One of ordinary skill in the art will appreciate that: realize all or part of step of said method embodiment
Suddenly can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer
In read/write memory medium, this program upon execution, performs to include the step of said method embodiment；
And aforesaid storage medium includes: read only memory (Read-Only Memory is called for short ROM),
Random access memory (Random Access Memory is called for short RAM), magnetic disc or CD etc.
The various media that can store program code.
In the embodiments such as apparatus and method of the present invention, it is clear that each parts or each step are to divide
Solve, combine and/or decompose after reconfigure.These decompose and/or reconfigure and should be regarded as the present invention
Equivalents.Meanwhile, in description to the specific embodiment of the invention above, implement for one
Mode describes and/or the feature that illustrates can be in same or similar mode one or more other
Embodiment uses, combined with the feature in other embodiment, or substitute other embodiment
In feature.
It should be emphasized that term " include/comprise " referring to when using herein feature, key element, step or
The existence of assembly, but it is not precluded from depositing of one or more further feature, key element, step or assembly
Or additional.
Last it is noted that although the present invention and advantage thereof have been described in detail above, but should
When understanding in the situation without departing from the spirit and scope of the present invention being defined by the claims appended hereto
Under can carry out various change, substitute and convert.And, the scope of the present invention is not limited only to description
Described process, equipment, means, the specific embodiment of method and steps.Common in this area
Technical staff will readily appreciate that from the disclosure, according to the present invention can use execution with
Function that this described corresponding embodiment is essentially identical or obtain the result essentially identical with it, show
Have and process, equipment, means, method or step the most to be developed.Therefore, appended power
Profit requires to be directed in the range of them including such process, equipment, means, method or step.
Claims (8)
1. an intelligent switch, it is characterised in that including:
At least one relay, is used for connecting load；
Detection device, for detecting the instantaneous of the alternating current of the relay being passed through controlled load connection
Value；
Acquisition module, including described for determining according to described instantaneous value relation over time
The frequency acquisition module of the frequency of alternating current, and for by this frequency acquisition alternating current zero passage
The time-obtaining module of the time point of point；
Time Calculation module, for prolonging according to time point and the actuating of relay of zero-crossing of alternating current
Time late, calculate the time point controlling the actuating of relay；
Controller, controls the actuating of relay for the time point according to the described control actuating of relay.
Intelligent switch the most according to claim 1, it is characterised in that described frequency obtains
Delivery block is additionally operable to instantaneous value according to described alternating current and obtains alternating current phases curve, and according to
The frequency of described alternating current phases curve acquisition alternating current.
Intelligent switch the most according to claim 1, it is characterised in that described detection fills
Put and include photoelectrical coupler.
4. an intelligent control network, opens including the intelligence described in any one of claim 1-3
Close.
5. the control method of an intelligent switch, it is characterised in that including:
Obtain the control instruction of controlled load；
Detection is passed through the instantaneous value of the alternating current of the relay that controlled load connects；
Determine the frequency of described alternating current according to described instantaneous value relation over time, and lead to
Cross the time point of this frequency acquisition zero-crossing of alternating current；
Time point according to zero-crossing of alternating current and actuating of relay time delay, determine that control continues
The time point of electrical equipment action；
According to the time point of the described control actuating of relay, control the actuating of relay.
The control method of intelligent switch the most according to claim 5, it is characterised in that
It is concrete " to determine the frequency of described alternating current according to described instantaneous value relation over time "
Including:
Instantaneous value according to described alternating current obtains alternating current phases curve, and according to described exchange
Electricity phase curve obtains the frequency of alternating current.
The control method of intelligent switch the most according to claim 6, it is characterised in that
" according to the frequency of described alternating current phases curve acquisition alternating current " specifically includes:
At the first phase point that two amplitudes of crest two side draw of alternating current phases curve are equal；
In the second phase that next two amplitude of crest two side draw of alternating current phases curve are equal
Point；
Take the first time point corresponding to center of said two first phase point line, Yi Jisuo
State the second time point corresponding to two second phase point line centers；
According to the time difference between described second time point and first time point, calculate described friendship
The frequency of stream electricity.
The control method of intelligent switch the most according to claim 5, it is characterised in that
Described " determining the time point controlling the actuating of relay " specifically includes: by zero-crossing of alternating current
Time point deducts actuating of relay time delay, as the time point controlling the actuating of relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310274443.5A CN104299480B (en) | 2013-07-02 | 2013-07-02 | Intelligent switch and control method, intelligent control network |
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| CN201310274443.5A CN104299480B (en) | 2013-07-02 | 2013-07-02 | Intelligent switch and control method, intelligent control network |
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| CN104299480B true CN104299480B (en) | 2016-08-24 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242728A (en) * | 2015-10-28 | 2016-01-13 | 小米科技有限责任公司 | Method and device controlling power on/off of intelligent socket, and the intelligent socket |
| CN108363318A (en) * | 2018-02-11 | 2018-08-03 | 四川虹美智能科技有限公司 | A kind of method, system and a kind of control chip of the switching of control on off state |
| CN108766835A (en) * | 2018-06-05 | 2018-11-06 | 深圳绿米联创科技有限公司 | Intelligent switch and its control method |
| CN108896813A (en) * | 2018-06-29 | 2018-11-27 | 广东美的环境电器制造有限公司 | A kind of detection method of zero cross signal, system, device and computer storage medium |
| CN112864731A (en) * | 2021-01-13 | 2021-05-28 | 宁波公牛数码科技有限公司 | Smart jack and control method for smart jack |
| CN113203890B (en) * | 2021-05-10 | 2022-08-30 | 深圳市海和科技股份有限公司 | Load control method, device and storage medium |
| CN115527804A (en) * | 2022-10-19 | 2022-12-27 | 聆思半导体技术(苏州)有限公司 | Intelligent switch delay control time self-adjusting method, chip and circuit |
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| CN201994588U (en) * | 2011-02-22 | 2011-09-28 | 李彬雄 | Intelligent switch |
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| GB956896A (en) * | 1960-09-23 | 1964-04-29 | Standard Telephones Cables Ltd | Circuit arrangement for detecting the signal of the greatest value from a set of signals |
| CN201118539Y (en) * | 2007-09-27 | 2008-09-17 | 王廷严 | Intelligent compound switch |
| CN101599660A (en) * | 2008-06-06 | 2009-12-09 | 深圳市海洋王照明科技股份有限公司 | A kind of alternating current is changing method and system at random |
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| CN104299480A (en) | 2015-01-21 |
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