CN204030607U - A kind of single-phase intelligent expansion joint electric controller - Google Patents
A kind of single-phase intelligent expansion joint electric controller Download PDFInfo
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- CN204030607U CN204030607U CN201420350532.3U CN201420350532U CN204030607U CN 204030607 U CN204030607 U CN 204030607U CN 201420350532 U CN201420350532 U CN 201420350532U CN 204030607 U CN204030607 U CN 204030607U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model belongs to electric-electronic power saving control field, be specifically related to a kind of single-phase intelligent expansion joint electric controller, comprise central processing unit, Saving Power Control Circuit, the first power supply, second source, described central processing unit and electricity-saving controller are electrically connected, the display circuit be electrically connected with central processing unit, electric energy metrical testing circuit, the balance change-over circuit, the current-limiting protection circuit that are electrically connected with electric energy metrical testing circuit, the voltage transformer be electrically connected with current-limiting protection circuit, the current transformer be electrically connected with balance change-over circuit; The utility model can the electricity consumption situation of real-time tracking user, how to detect the power consumption efficiency judged on circuit, eliminate the hidden danger that fixed knot electrical equipment becomes capacitive load, make to be in high efficiency electricity condition with the electric line moment, thus reach the effect of economize on electricity, reach the effect of economize on electricity better.
Description
Technical field
The utility model relates to electric-electronic power saving control field, is specifically related to a kind of single-phase intelligent expansion joint electric controller.
Background technology
Single-phase electricity-saving device major part is in the market all plug and play, is fixedly connected with on the line, and power savings is not clearly, is that the power quality of user constantly changes because a lot of electrical equipment has been installed by user family.Therefore, do not have the electricity-saving appliance of real-time tracking domestic consumer power quality, the power savings of its electricity-saving appliance is real unconspicuous.Because when household electrical appliance quit work, electricity-saving appliance still connects on the line, now, electricity-saving appliance is also simultaneously the electric equipment of a potential power consumption.Therefore, the electricity-saving appliance be connected on circuit can become the hidden danger of waste electrical equipment on the contrary.Along with the economic development of China, the living standard of the people improves constantly, and every household all adds a lot of household electrical appliance, and the irrational utilization of the energy also gets more and more.Therefore, develop to circuit can have the home economizer regulated in real time could really meet energy-saving and emission-reduction in the urgent need to.
Single-phase electricity-saving device is fixedly connected with very unreasonable on the line, when circuit there is no load, fixed knot electrical equipment will become a capacitive load, when circuit has load, during power consumption efficiency height, the fixed knot electrical equipment being connected to circuit on circuit also can become a capacitive load, only when the power consumption efficiency on circuit is low, fixed knot electrical equipment just can play and raise the efficiency, thus reach the effect of economize on electricity object, but the power quality of family is again constantly change, and single fixed knot electrical equipment just can not play the effect of economize on electricity constantly.
Utility model content
The purpose of this utility model is for solving the problem, provide a kind of single-phase intelligent joint control apparatus, can the electricity consumption situation of real-time tracking user, how to detect the power consumption efficiency judged on circuit, eliminate the hidden danger that fixed knot electrical equipment becomes capacitive load, make to be in high efficiency electricity condition with the electric line moment, thus reach the effect of economize on electricity, reach the effect of economize on electricity better.
For achieving the above object, the utility model provides following technical scheme:
A kind of single-phase intelligent expansion joint electric controller, it is characterized in that: comprise central processing unit, Saving Power Control Circuit, the first power supply, second source, described central processing unit and electricity-saving controller are electrically connected, also comprise the display circuit, the electric energy metrical testing circuit that are electrically connected with central processing unit, the balance change-over circuit, the current-limiting protection circuit that are electrically connected with electric energy metrical testing circuit, the voltage transformer be electrically connected with current-limiting protection circuit, the current transformer be electrically connected with balance change-over circuit;
Described first power supply is connected with Saving Power Control Circuit, and described second source circuit is connected with central processing unit and electric energy metrical testing circuit;
Described Saving Power Control Circuit, voltage transformer, current transformer are also electrically connected with line.
It is to be appreciated that, most of single-phase electricity-saving device in the market can play its power savings, having household electrical appliance unlatching just to carry out joint compensation to the electrical equipment in circuit, not there is the power quality of user in Real-Time Monitoring circuit, in this programme, can the power quality of user in Real-Time Monitoring circuit, at any time power back-off is carried out to the electrical equipment in circuit, when the user power utilization quality in circuit is better, the economize on electricity compensation control circuit in circuit automatically can be excised.
Preferably, described Saving Power Control Circuit comprises triode Q1, relay K 1, light-emitting diode D1, diode D2, resistance R40, resistance R41, resistance R42 and electric capacity C40 and electric capacity C41, the base stage of described triode Q1 is connected in series by resistance R40 and central processing unit, collector electrode is connected to ground, the crus secunda of emitter and relay K 1, the anode of diode D2 connects, the negative electrode of described diode D2 and the first power supply, first pin of relay K 1 connects, the described tripod of relay K 1 and one end of inductance L 1 are connected in series, 4th pin of relay K 1 is connected with the N end points of line, described electric capacity C40 and electric capacity C41 is connected in parallel rear one end and inductance L 1 other end, one end of resistance R41 is connected in series, the other end is connected with the L end points of line, the other end of described resistance R41 and the negative electrode of light-emitting diode D1, one end of resistance R42 is connected in series, the anode of described light-emitting diode D1 is connected with the L end points of line, the other end of described resistance R42 is connected with the L end points of line.Like this can as while economize on electricity compensating circuit, the high frequency ripple also produced in the circuit of filtering simultaneously, eliminates ripple to the impact of power factor compensation.
Further, described Saving Power Control Circuit at least comprises the control circuit of a road or multi-channel parallel.
Further preferably, described Saving Power Control Circuit is the control circuit of four tunnel parallel connections.
Select single channel Saving Power Control Circuit, circuit-line remained on always and preferably uses electricity condition, introduce multi-way intelligence and control Saving Power Control Circuit, make the power quality in circuit be in best electricity condition,
Further, described central processing unit is connected with the SPI universal serial bus of electric energy metrical testing circuit, and the model of described electric energy metrical testing circuit is RN8209.
Concrete, be electrically connected with described balance change-over circuit between the 4th pin of described electric energy metrical testing circuit RN8209 and the 5th pin, octal and the current-limiting protection circuit of described RN8209 are electrically connected.
Preferably, the voltage of the octal of described electric energy metrical testing circuit RN8209 is 12V, and between the 4th pin and the 5th pin, voltage difference is 6V.
In single-phase economize on electricity controls, electric energy metrical testing circuit is data acquisition unit, has both needed guaranteed performance stable, accurately and reliable, also needs that the structure of circuit is simple, deal with data is multiple functional, and price also wants cheap metering circuit; RN8209 is the electric energy metrical testing circuit that function is comparatively complete, and deal with data is fast, and fairly simple, easy to use with central processing unit connected mode, accuracy is high.
The utility model compared with prior art, has following beneficial effect:
Circuit structure service behaviour of the present utility model not only efficiently and accurately, reliability is high, precision is high, Real-Time Monitoring and the power quality followed the tracks of in line, the object of intelligent energy-saving compensatory control can be realized, and carry out automatic electric and can compensate, the high frequency ripple in circuit can be removed, eliminate the hidden danger that fixed knot electrical equipment becomes capacitive load, make the power quality in circuit be in best state, reach the effect of energy-saving compensated, cost is lower, use is extensive.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model example or technical scheme of the prior art, introduce doing accompanying drawing required in embodiment or description of the prior art simply below, obviously, accompanying drawing in the following describes is only examples more of the present utility model, to those skilled in the art, do not paying under creationary prerequisite, other accompanying drawing can also obtained according to these accompanying drawings.
Fig. 1 is a kind of single-phase intelligent expansion joint of the utility model electric controller structural representation.
Fig. 2 is the schematic diagram of the electric energy metrical testing circuit of the utility model specific embodiment.
Fig. 3 is the schematic diagram of the Saving Power Control Circuit of the utility model specific embodiment.
Fig. 4 is the schematic diagram of the Saving Power Control Circuit of another embodiment of the utility model.
In accompanying drawing, 1-first power supply, 2-display circuit, 3-second source, 4-central processing unit, 5-electricity-saving controller, 6-electric energy metrical testing circuit, 7-balances change-over circuit, 8-current transformer, 9-current-limiting protection circuit, 10-current transformer,
Embodiment
Below in conjunction with the accompanying drawing in the utility model example, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 1, give the structural representation of a kind of single-phase intelligent expansion joint of the utility model electric controller, comprise central processing unit 4, Saving Power Control Circuit 5, first power supply 1, second source 3, described central processing unit 4 is electrically connected with electricity-saving controller 5, also comprise the display circuit 2 be electrically connected with central processing unit 4, electric energy metrical testing circuit 6, the balance change-over circuit 7 be electrically connected with electric energy metrical testing circuit 6, current-limiting protection circuit 9, the voltage transformer 10 be electrically connected with current-limiting protection circuit 9, the current transformer 8 be electrically connected with balance change-over circuit 7.
Wherein, central processing unit 4 adopts AT89S52 single-chip microcomputer, electric energy metrical testing circuit 6 adopts RN8209 chip, first power supply 1 exports+12V (VCC) supply voltage, and providing power supply to Saving Power Control Circuit 5, second source circuit 3 provides+5V supply voltage to central processing unit 5, electric energy metrical testing circuit 6.
See Fig. 2, as specific embodiment of the utility model, described voltage transformer 10, current transformer 8 is electrically connected with 220VAC line, current transformer 8 is connected in series in the line with the L end points (zero line) of 220VAC line, electric current in circuit is sampled, voltage transformer 10 is connected with N end points (live wire), voltage in circuit is sampled, in the utility model embodiment, the signal of electric current after balancing circuitry 7 that current transformer 8 is sampled, then input between the 4th pin of RN8209 and the 5th pin respectively, the signal that the voltage that voltage transformer 10 is sampled exports after current-limiting protection circuit 9, then input the octal of RN8209.Wherein, the voltage of the octal input of RN8209 is 12V, and between the 4th pin and the 5th pin, voltage difference is 6V.Wherein, the tenth tripod (SDO) of central processing unit 4 and the serial data mouth of electric energy metrical testing circuit RN8209, the 14 pin (SDI), the 15 pin (SCLK), the 16 pin (SCSN) are connected respectively.Wherein, 16 pin (SCSN) is chip selection signal pin, when with central processing unit 4 export make chip selection signal SCSN pin become low level from high level time, now central processing unit 4 writes with the serial data bus (SPI) of RN82099 or reads data.Now central processing unit 4 is write by the tenth tripod (SDO), the 14 pin (SDI) and the 16 pin (SCSN) the clock control signal serial data bus (SPI) to RN82099 or is read data.
See Fig. 1 and Fig. 3, as most preferred embodiment of the present utility model, described Saving Power Control Circuit 5 comprises triode Q1, relay K 1, light-emitting diode D1, diode D2, resistance R40, resistance R41 and resistance R42 and electric capacity C40 and electric capacity C41, the base stage of described triode Q1 is connected with the P0.0 pin serial connection of central processing unit 4 by resistance R40, collector electrode is connected to ground, the crus secunda of emitter and relay K 1, the anode of diode D2 connects, the negative electrode of described diode D2 and the first power supply, first pin of relay K 1 connects, the described tripod of relay K 1 and one end of inductance L 1 are connected in series, 4th pin of relay K 1 is connected with the N end points (live wire) of 220VAC line, described electric capacity C40 and electric capacity C41 is connected in parallel rear one end and inductance L 1 other end, one end of resistance R41 is connected in series, the other end is connected with the L end points of 220VAC line, the other end of described resistance R41 and the negative electrode of light-emitting diode D1, one end of resistance R42 is connected in series, the anode of described light-emitting diode D1 connects in the L end points (zero line) of 220VAC line, the other end of described resistance R42 is connected with the L end points (zero line) of 220VAC line.
When Saving Power Control Circuit 5 carries out power back-off to line, the P0.0 pin of central processing unit exports the base stage of high level by resistance R40 to triode Q1, now, after triode Q1 conducting, relay K 1 is closed, meanwhile, the compensating circuit be made up of inductance L 1, electric capacity C40 and electric capacity C41 and divider resistance R40, resistance R41, carry out power back-off to line, light-emitting diode D1 indicates the operating state of power back-off in circuit.Diode D2 is protection is relay K 1 and arranging, and when preventing relay K 1 from starting suddenly, the big current of generation is damaged.
In the utility model, the signal of electric current after balancing circuitry 7 that current transformer 8 is sampled inputs the 4th pin of RN8209 respectively, the octal of the signal input RN8209 that the voltage that voltage transformer 10 is sampled exports after current-limiting protection circuit 9, after electric energy metrical testing circuit RN8209 carries out data operation, after the data that central processing unit 4 reads, when power quality efficiency in the line of display is higher, be then excellent, power factor is more than 0.94; If time lower by the power quality efficiency in electric line, then for poor, power factor, below 0.93, when power quality efficiency is lower, then will starts economize on electricity compensation control circuit and carry out power back-off in line.
See Fig. 1 ~ Fig. 3, to be further elaborated operation principle of the present utility model, current transformer 8 samples the electric current in line, voltage transformer 8 samples voltage in line, then the active power in electric energy metrical testing circuit 6 pairs of lines is inputted, merit power verifies, the parameters such as reactive power verification carry out gauge check computing, central processing unit 4 reads the result of operational data, and judge that the power quality on circuit is excellent, or for poor, then the P0.0 pin of central processing unit 4 then exports corresponding level to triode Q1 base stage after connecting to resistance R40, then triode Q1 conducting or cut-off, the switch of relay K 1 is made to disconnect or close, now, electric capacity C40, electric capacity C41, inductance L 1, the compensating circuit that resistance R41 and electric capacity R42 forms is connected in line, power back-off is carried out to by electric line.When the electric appliance efficiency in circuit is high, when being excellent, the P0.0 pin output low level signal of central processing unit 4 makes the switch of relay K 1 disconnect, building-out capacitor is cut, on circuit, do not carry out power back-off, now, the electric capacity C40 in compensating circuit, electric capacity C41 carry out charging work.When the electric appliance efficiency in line is low, when being poor, the P0.0 pin of central processing unit 2 exports high level signal makes the switch of relay K 1 close, compensating circuit is linked in line, the discharge circuit of building-out capacitor C40, electric capacity C41 and inductance L 1 and discharge resistance R41, resistance R42 composition, carries out power back-off to in electric line.The light-emitting diode D1 be now connected in parallel with R42 can be shinny, and instruction carries out power back-off on circuit.Meanwhile, inductance L 1, electric capacity C40, electric capacity C41, resistance R41 and resistance R42 in circuit can also high-frequency ripple in the circuit in filtering circuit.
See Fig. 1, Fig. 2 and Fig. 4, as another embodiment of the present utility model, it is the economize on electricity compensation control circuit carrying out the Saving Power Control Circuit 5 of single channel to compose in parallel four tunnels, after electric energy metrical testing circuit 6 samples electric current in circuit according to current transformer 8, voltage transformer 8 voltage sampled in circuit carries out calculation process, central processing unit 4 reads operational data result and judges the power consumption efficiency of electrical equipment in circuit, central processing unit 4 selects closed Ith tunnel, the IIth tunnel, the IIIth tunnel or the IVth tunnel economize on electricity compensating circuit, in circuit, carry out power back-off.Or closed I ~ IV tunnel simultaneously, or select any a few road in closed I ~ IV tunnel.
Wherein, Ith tunnel, comprise triode Q1, relay K 1, light-emitting diode D1, diode D2, resistance R40, resistance R41, resistance R42 and electric capacity C40 and electric capacity C41, the base stage of described triode Q1 is connected with the P0.0 pin serial connection of central processing unit by resistance R40, collector electrode is connected to ground, the crus secunda of emitter and relay K 1, the anode of diode D2 connects, the negative electrode of described diode D2 and the first power supply, first pin of relay K 1 connects, the described tripod of relay K 1 and one end of inductance L 1 are connected in series, 4th pin of relay K 1 is connected with the N end points of line, described electric capacity C40 and electric capacity C41 is connected in parallel rear one end and inductance L 1 other end, one end of resistance R41 is connected in series, the L end points (zero line) of the other end and line, the other end of described resistance R41 and the negative electrode of light-emitting diode D1, one end of resistance R42 is connected in series, the anode of described light-emitting diode D1 and the L end points (zero line) of line, the other end of described resistance R42 and the L end points of line.
When Saving Power Control Circuit 5 carries out power back-off to line, the P0.0 pin of central processing unit exports the base stage of high level by resistance R40 to triode Q1, now, after triode Q1 conducting, relay K 1 is closed, meanwhile, the compensating circuit be made up of inductance L 1, electric capacity C40, electric capacity C41 and divider resistance R40, electric capacity R41, carry out power back-off to line, light-emitting diode D1 indicates the operating state of power back-off in circuit.Diode D2 is protection is relay K 1 and arranging, and when preventing relay K 1 from starting suddenly, the big current of generation is damaged.
IIth tunnel, comprises the compensating circuit of triode Q2, relay K 2, light-emitting diode D3, diode D4 and resistance R43 and resistance R44, resistance R45, electric capacity C42, electric capacity C43 and inductance L 2 composition.
IIIth tunnel, comprises the compensating circuit of triode Q3, relay K 3, light-emitting diode D5, diode D6 and resistance R46 and resistance R47, resistance R48, electric capacity C44, electric capacity C45 and inductance L 3 composition.
IVth tunnel, comprises the compensating circuit that triode Q4, relay K 4, light-emitting diode D7, diode D8 and resistance R49 and resistance R50, resistance R51 and electric capacity C46, electric capacity C47 and inductance L 4 form.
Wherein, in IIth tunnel ~ the IVth tunnel, the annexation of each circuit components is identical with the Ith tunnel, the function of each circuit components is also identical, difference is, the base stage of triode Q2 is connected with the P0.1 pin serial connection of central processing unit by resistance R43, the base stage of triode Q3 is connected with the P0.2 pin serial connection of central processing unit by resistance R46, and the base stage of triode Q4 is connected with the P0.3 pin serial connection of central processing unit by resistance R49.
In the present embodiment, four pin of relay device K1 ~ K4 are connected to the N end points (live wire) on 220VAC line all simultaneously, the base stage of triode Q1 ~ Q4 is respectively by resistance R40, resistance R43, resistance R46, P0.0 ~ P0.3 pin of resistance R49 and central processing unit is connected in series respectively, and the disconnection of control relay K1 ~ K4 or closed, closed several roads compensating circuit is selected according to the power quality of wireline inspection, power back-off is carried out in line, when selecting a road compensating circuit Operating In Persistent Current Mode, can by more than the power factor compensation to 0.94 in circuit, when selecting many compensating circuits to close, power factor in circuit can close to 0.99, more effectively improve the power factor in line, improve the effect compensated, reach the object of economize on electricity.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; allly to use within novel spirit and principle at this, any amendment done, equivalent replacement, improvement etc., within the protection range that all should be included in utility model.
Claims (7)
1. a single-phase intelligent expansion joint electric controller, it is characterized in that: comprise central processing unit, Saving Power Control Circuit, the first power supply, second source, described central processing unit and electricity-saving controller are electrically connected, also comprise the display circuit, the electric energy metrical testing circuit that are electrically connected with central processing unit, the balance change-over circuit, the current-limiting protection circuit that are electrically connected with electric energy metrical testing circuit, the voltage transformer be electrically connected with current-limiting protection circuit, the current transformer be electrically connected with balance change-over circuit;
Described first power supply is connected with Saving Power Control Circuit, and described second source circuit is connected with central processing unit and electric energy metrical testing circuit;
Described Saving Power Control Circuit, voltage transformer, current transformer are also electrically connected with line.
2. a kind of single-phase intelligent expansion joint electric controller as claimed in claim 1, it is characterized in that: described Saving Power Control Circuit comprises triode Q1, relay K 1, light-emitting diode D1, diode D2, resistance R40, resistance R41, resistance R42 and electric capacity C40 and electric capacity C41, the base stage of described triode Q1 is connected in series by resistance R40 and central processing unit, collector electrode is connected to ground, the crus secunda of emitter and relay K 1, the anode of diode D2 connects, the negative electrode of described diode D2 and the first power supply, first pin of relay K 1 connects, the described tripod of relay K 1 and one end of inductance L 1 are connected in series, 4th pin of relay K 1 is connected with the N end points of line, described electric capacity C40 and electric capacity C41 is connected in parallel rear one end and inductance L 1 other end, one end of resistance R41 is connected in series, the other end is connected with the L end points of line, the other end of described resistance R41 and the negative electrode of light-emitting diode D1, one end of resistance R42 is connected in series, the anode of described light-emitting diode D1 is connected with the L end points of line, the other end of described resistance R42 is connected with the L end points of line.
3. a kind of single-phase intelligent expansion joint electric controller as claimed in claim 2, it is characterized in that, described Saving Power Control Circuit at least comprises the control circuit of a road or multi-channel parallel.
4. a kind of single-phase intelligent expansion joint electric controller as claimed in claim 3, is characterized in that, described Saving Power Control Circuit is the control circuit of four tunnel parallel connections.
5. the control method of a kind of single-phase intelligent expansion joint electric controller as claimed in claim 1, it is characterized in that, described central processing unit is connected with the SPI universal serial bus of electric energy metrical testing circuit, and the model of described electric energy metrical testing circuit is RN8209.
6. a kind of single-phase intelligent expansion joint electric controller as claimed in claim 5; it is characterized in that; be electrically connected with described balance change-over circuit between 4th pin of described electric energy metrical testing circuit RN8209 and the 5th pin, octal and the current-limiting protection circuit of described RN8209 are electrically connected.
7. single-phase intelligent expansion joint electric controller as claimed in claim 6, it is characterized in that, the voltage of the octal of described electric energy metrical testing circuit RN8209 is 12V, and between the 4th pin and the 5th pin, voltage difference is 6V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420350532.3U CN204030607U (en) | 2014-06-27 | 2014-06-27 | A kind of single-phase intelligent expansion joint electric controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420350532.3U CN204030607U (en) | 2014-06-27 | 2014-06-27 | A kind of single-phase intelligent expansion joint electric controller |
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| Publication Number | Publication Date |
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| CN204030607U true CN204030607U (en) | 2014-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420350532.3U Expired - Fee Related CN204030607U (en) | 2014-06-27 | 2014-06-27 | A kind of single-phase intelligent expansion joint electric controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104092A (en) * | 2014-06-27 | 2014-10-15 | 南宁市绿沃节能科技有限公司 | Single-phase intelligent compensating power saving controller and control method thereof |
-
2014
- 2014-06-27 CN CN201420350532.3U patent/CN204030607U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104092A (en) * | 2014-06-27 | 2014-10-15 | 南宁市绿沃节能科技有限公司 | Single-phase intelligent compensating power saving controller and control method thereof |
| CN104104092B (en) * | 2014-06-27 | 2016-08-17 | 南宁市绿沃节能科技有限公司 | A kind of single-phase intelligent expansion joint electric controller and control method thereof |
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Granted publication date: 20141217 Termination date: 20150627 |
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