CN101741140B - Novel power saving system - Google Patents
Novel power saving system Download PDFInfo
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- CN101741140B CN101741140B CN2009102163248A CN200910216324A CN101741140B CN 101741140 B CN101741140 B CN 101741140B CN 2009102163248 A CN2009102163248 A CN 2009102163248A CN 200910216324 A CN200910216324 A CN 200910216324A CN 101741140 B CN101741140 B CN 101741140B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
- Y04S20/246—Home appliances the system involving the remote operation of lamps or lighting equipment
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Abstract
The invention discloses a novel power saving system which is characterized in that: the novel power saving system is composed of a singlechip system for signal analysis, processing and judgment, a voltage acquisition system which is used for colleting voltage signals and generating high-low electrical level, a current acquisition system which is used for colleting current signals and generating triggering level, a data analytical system for adjusting the electrical level numerical value in the voltage acquisition system and the current acquisition system, a data display system for displaying various kinds of information of the whole system, and a power-saving module system for adjusting the electrical level numerical value; the voltage acquisition system, the current acquisition system, the data analytical system and the power-saving module system are connected with the singlechip system; compared with the prior art, the novel power saving system has simpler structure; in addition, the novel power saving system adopts the AT89C51 singlechip in America ATMEL company as a core processor and uses an LM324 comparison amplifier produced by America NSC, therefore, the whole system of the invention has stable operation and rapid processing speed.
Description
Technical field
The present invention relates to a kind of power saving apparatus, specifically be meant the novel power saving system that is used for the urban lighting management.
Background technology
Electricity is as a kind of important energy, and is all essential in which field of current society.Therefore the power saving apparatus of many types has appearred in the generally enhancing of Along with people's energy-conserving and environment-protective consciousness on the market, and it uses the widest is exactly employed frequency conversion power saving system at large, medium and small type industrial site and in living.
Though these frequency conversion power saving systems have saved electric energy to a certain extent, its power savings is also not very very high in general, awaits further to strengthen.(power saving apparatus in market is more single control system now; Can only regulating and controlling change with manual; Thereby can not accomplish that reasonable science is energy-conservation; Cause subscriber equipment to break down sometimes, as: it is asymmetric that present power saving apparatus is easy to cause line voltage and other parameters to take place in use, can not follow the tracks of and regulate and the operation of generation bypass in time.Voltage parameter is present of paramount importance numerical value, and our power saving apparatus adopts multiterminal to regulate now, and fixed point is kept watch on and is can constantly scan one operation around certain numerical value, thereby can not impact to load equipment.Reasonable distribution power supply coefficient).
Summary of the invention
It is relatively poor to the objective of the invention is to overcome present power saving apparatus power savings, and baroque defective provides a kind of not only simple in structure, and the very tangible novel power saving system of power savings.
The object of the invention is realized through following technical proposals: a kind of novel power saving system; Mainly by the voltage acquisition system that is used for SCM system that signal analysis and processing judges, be used to gather voltage signal and produce high-low level, current acquisition system, the data analysis system that is used for regulation voltage acquisition system and current acquisition system level numerical value, the data presentation system that is used to show the various information of whole system that are used to gather current signal and produce triggering level, the energy-saving module system that is used to regulate the multiple spot fluctuation voltage form, described voltage acquisition system, current acquisition system, data analysis system, data presentation system, energy-saving module system all are connected with this SCM system.
Further; The structure of described voltage acquisition system is: an output of voltage sensor is connected with No. 11 ports of comparison amplifier M1 after resistance R 1, and another output of voltage sensor directly is connected with the in-phase input end of comparison amplifier M1; No. 11 ports of comparison amplifier M1 are connected with its No. 4 ports after slide rheostat R3 and resistance R 2, and the sliding end of slide rheostat R3 then is connected with the inverting input of comparison amplifier M1; The output of said comparison amplifier M1 is connected with its No. 11 ports after resistance R 5, and the output of comparison amplifier M1 also is connected with single-chip microcomputer after resistance R 4; No. 11 port ground connection of said comparison amplifier M1, the DC power supply of No. 4 external 15V of port.
The structure of described current acquisition system is: an output of current sensor is connected with No. 11 ports of comparison amplifier M2 after resistance R 8, and another output of current sensor directly is connected with the in-phase input end of comparison amplifier M2; No. 11 ports of comparison amplifier M2 are connected with its No. 4 ports after slide rheostat R9 and resistance R 10, and the sliding end of slide rheostat R9 then is connected with the inverting input of comparison amplifier M2; The output of said comparison amplifier M2 is connected with its No. 11 ports after resistance R 11, and the output of comparison amplifier M2 also is connected with single-chip microcomputer after resistance R 12; No. 11 port ground connection of said comparison amplifier M2, the DC power supply of No. 4 external 15V of port.
The structure of described energy-saving module system is: the external 5V DC power supply of an end of resistance R 14, the input of not gate N1 is connected with single-chip microcomputer, the output of not gate N1 be connected with the input of photoelectrical coupler A again after the other end of resistance R 14 is connected; The output head grounding of this photoelectrical coupler A, another output then is connected with the input of relay D1, and relay D1 also is parallel with photodiode LED.Simultaneously, the external 5V DC power supply of an end of resistance R 13, the input of not gate N2 is connected with single-chip microcomputer, the output of not gate N2 be connected with the input of photoelectrical coupler B again after the other end of resistance R 13 is connected; The output head grounding of this photoelectrical coupler B, another output then is connected with the input of relay D2, and this relay D2 also is parallel with photodiode LED.The output of said relay D2 and external again 24V DC power supply after the output of relay D1 is connected.
Described data analysis system structure is: capacitor C 1 be in parallel with electric capacity Y1 again after capacitor C 2 is connected, and the two ends of this electric capacity Y1 also are connected with single-chip microcomputer respectively, the tie point ground connection of capacitor C 2 and capacitor C 1; The normally opened contact K1 of relay D1 is with parallelly connected with capacitor C 3 again after resistance R 6 is connected, and not only ground connection but also directly be connected the then external 5V DC power supply of the other end after the parallel connection with single-chip microcomputer after resistance R 7 of the end after the parallel connection.
In order better to realize 8 that the present invention, the employing American ATMEL of described single-chip microcomputer produce and to carry the AT89C51 type single-chip microcomputer of watchdog circuit.
The LM324 type comparison amplifier that said comparison amplifier M1 and M2 then adopt the U.S. " state half " company to produce.But this amplifier has characteristics such as short-circuit protection output, the work of true differential input level single supply, and this comparison amplifier also has low-voltage (3V-32V), low bias current (maximum 100nA), each comparison amplifier inside and also encapsulates pin arrangements and the input that four operational amplifiers, the function with internal compensation, common mode range expand to negative supply, industry standard and have functional characteristics such as electrostatic protection.
In order better to show, described data presentation system is a LCD.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) structure of the present invention is compared more simple than prior art; And the present invention also adopts the AT89C51 single-chip microcomputer of American ATMEL to be used as core processor; Adopt the LM324 comparison amplifier of the production of the U.S. " state half "; Therefore the operation of whole system of the present invention is highly stable, and processing speed is very fast.
(2) the present invention combines AT89C51 type single-chip microcomputer and LM324 type comparison amplifier; Therefore can accomplish interactively to keep watch on electrical network parameter, and can distribute and rationally regulate electrical network parameter, thereby accomplish twoly to monitor and show integrated from controlling; Accomplish automatically-monitored, regulate and judge bypass; Therefore automaticity is very high, does not need manual work to guard, thereby saves the man power and material.
(3) can not only further reduce the loss (loss of this part accounts for the 2%-3% of transformer capacity usually) of transformer, supply line through the present invention; Reach more than 3 times but also can prolong its useful life, power savings can reach more than 60% of traditional electricity-saving appliance.
Description of drawings
Fig. 1 is an overall structure block diagram of the present invention.
Fig. 2 is the electrical block diagram of single-chip microcomputer of the present invention and data presentation system.
Fig. 3 is a voltage acquisition circuit system structural representation of the present invention.
Fig. 4 is a current acquisition system electrical block diagram of the present invention.
Fig. 5 is a data analysis system electrical block diagram of the present invention.
Fig. 6 is an energy-saving module circuit system structural representation of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done to specify further, but execution mode of the present invention is not limited thereto.
Embodiment
As shown in Figure 1, SCM system is as most important parts of the present invention, is mainly used in to bring the signal of all the sensors and comparison amplifier that analyzing and processing judges, controls whole driving arrangement system.The voltage acquisition system is mainly used in gathers voltage signal and produces high-low level; Current acquisition system is mainly used in to be gathered current signal and produces triggering level; Data analysis system is mainly used in level numerical value in regulation voltage acquisition system and the current acquisition system; Data presentation system is mainly used in and shows the various information of whole system; The energy-saving module system is mainly used in and regulates the multiple spot fluctuation voltage.And above-described voltage acquisition system, current acquisition system, data analysis system, data presentation system, energy-saving module system all are connected with this SCM system.
The structure of SCM system is as shown in Figure 2; In order to ensure result of use; This single-chip microcomputer adopts 8 of American ATMEL production and carries the AT89C51 type single-chip microcomputer of house dog electricity; Data presentation system then is made up of LCD; As shown in the figure, the P0.0/AD0 of single-chip microcomputer, P0.1/AD1, P0.2/AD2, P0.3/AD3, P0.4/AD4, P0.5/AD5, P0.6/AD6, these 8 ports of P0.7/AD7 are connected with the input of LCD respectively, so that this LCD can show different data messages according to the instruction of single-chip microcomputer.
As shown in Figure 3, this voltage acquisition system mainly forms with the electronic circuit of voltage sensor and comparison amplifier M1.In order to realize the present invention preferably, the LM324 type amplifier that this comparison amplifier adopts the U.S. " state half " company to produce.This comparison amplifier has following characteristics: 1, short-circuit protection output; But 2, true differential input level, 3 single supply work: 3V-32V, 4, low bias current: maximum 100nA, 5, each comparison amplifier inside also is packaged with four operational amplifiers; 6, the function that has internal compensation; 7, common mode range expands to negative supply, and 8, the pin arrangements of industry standard, 9, input has electrostatic protection function.Described voltage sensor is connected with the externally fed power supply; So that the actual voltage value of external power source is converted to the voltage analog value of 0～10V; And this voltage analog value is compared and enlarged, and cooperate with electronic circuit and to produce high-low level and handle to single-chip microcomputer and judge by comparison amplifier M1.
This voltage sensor adopts common voltage sensor to realize; During connection; An output of this voltage sensor directly is connected with the in-phase input end of comparison amplifier M1, and another output of voltage sensor then is connected with No. 11 terminals of comparison amplifier M1 after the resistance R 1 of 100K Ω again.The inverting input of comparison amplifier M1 is connected with the moving slippery fellow of slide rheostat R3; The end of this slide rheostat R3 also is connected with No. 11 terminals of comparison amplifier M1, and the other end of slide rheostat R3 then is connected to No. 4 terminals of comparison amplifier M1 after the resistance R 2 of 148K Ω.The output of comparison amplifier M1 then is divided into two-way, and one the tunnel is connected with No. 11 terminals of comparison amplifier M1 after the resistance R 5 of 10 Ω, and resistance R 4 backs of another Lu Zejing 8 Ω directly are connected with the p1.0 port of single-chip microcomputer.Simultaneously, No. 11 terminal ground connection of comparison amplifier M1, No. 4 terminals are the direct voltage of external 15V then.
In the actual motion, no matter which type of signal comparison amplifier M1 triggers, and single-chip microcomputer all can be handled according to present signal and judge current control and display requirement (single-chip microcomputer is with application program).As: when virtual voltage exceeds certain numerical value; Comparison amplifier M1 is according to analog signal that voltage sensor collected; Just corresponding which type of level signal that produces; And these level signals just send to energy-saving module system (at this moment, the economize on electricity I shelves in this power-saving module system move, thereby make whole system be in economize on electricity I shelves state) and LCD (being used for data shows) after sending the single-chip microcomputer Treatment Analysis to; When virtual voltage is lower than certain numerical value; Comparison amplifier M1 is according to analog signal that voltage sensor collected; Produce corresponding level signal; This level signal just sends to energy-saving module system (at this moment, the economize on electricity II shelves in this power-saving module system move, thereby make whole system be in economize on electricity II shelves state) and LCD (being used for data shows) after sending the single-chip microcomputer analyzing and processing to.
As shown in Figure 4, current acquisition system mainly is made up of the electronic circuit of current sensor and comparison amplifier M2.This comparison amplifier M2 is with relatively amplifier M1 is the same, and its model is LM324.During operation, this current sensor sends the current analog signal that is collected to comparison amplifier M2, triggers corresponding level again after regulating the signal of comparison amplifier M2 through electronic circuit.This level is transmitted to single-chip microcomputer and handles, and differentiates the electricity consumption situation of load according to the triggering of high-low level by single-chip microcomputer.If the load overload will produce warning and guard signal, thereby accomplish the effect of overload protection.
During connection, an output of this current sensor directly is connected with the in-phase input end of comparison amplifier M2, and another output of current sensor then is connected with No. 11 terminals of comparison amplifier M2 after the resistance R 8 of 100K Ω again.The inverting input of comparison amplifier M2 is connected with the moving slippery fellow of slide rheostat R9; The end of this slide rheostat R9 also is connected with No. 11 terminals of comparison amplifier M2, and the other end of slide rheostat R9 then is connected to No. 4 terminals of comparison amplifier M2 after the resistance R 10 of 148K Ω.The output of comparison amplifier M2 then is divided into two-way, and one the tunnel is connected with No. 11 terminals of comparison amplifier M2 after the resistance R 11 of 10 Ω, and resistance R 12 backs of another Lu Zejing 8 Ω directly are connected with the p1.3 port of single-chip microcomputer.Simultaneously, No. 11 terminal ground connection of comparison amplifier M2, No. 4 terminals are the direct voltage of external 15V then.
As shown in Figure 5; Data analysis system is exactly that analog signal that voltage sensor and current sensor are collected is regulated comparison amplifier M1 through electronic circuit and sent the needed rational level numerical value of correspondence with M2, and this level numerical value is delivered to the single-chip microcomputer analyzing and processing.After singlechip application programs is analyzed, to each regulating and controlling circuit, promptly between economize on electricity I shelves shown in Figure 6 and economize on electricity II shelves, control and switch, and the data display system is carried out correspondence demonstration.
During connection, by being in parallel with electric capacity Y1 after capacitor C 2 series connection of 30PF then of the capacitor C 1 of 30PF, and the two ends of this electric capacity Y1 are connected with two terminals of XTAL2 and XTAL1 of single-chip microcomputer respectively again.Simultaneously, the tie point of capacitor C 1 and C2 also with the VSS port of single-chip microcomputer ground connection in the lump.
Resistance be the resistance R 6 of 1K Ω with after the normally opened contact S1 of relay D1 connects, be that the capacitor C 3 of 22 μ F is parallelly connected with capacity again.Simultaneously, capacitor C 3 also is divided into two-way with the tie point of resistance R 6, the one tunnel after resistance is the resistance R 7 of 1K Ω ground connection, another road then directly is connected with the RST port of single-chip microcomputer.And the other end of capacitor C 3, an end that promptly is connected with normally opened contact S1 both had been connected with the VCC end of single-chip microcomputer, linked to each other with the 5V direct voltage of outside again.
Shown in Figure 6, the energy-saving module system is an import multiterminal adjustable type module, can regulate the multiple spot fluctuation voltage, thereby guarantees can not burn out load, and load is protected.During connection, resistance is that an end of the resistance R 14 of 1K Ω is connected with outside 5V direct voltage, and the input of not gate N1 is connected with the P1.1 port of single-chip microcomputer, and the other end of resistance R 14 is connected with the input of photoelectrical coupler A with the output of not gate N1 together.The output of this photoelectrical coupler A is divided into two-way, and one tunnel direct ground connection is connected with the 24V direct voltage of outside behind another Lu Zejing relay D1, and this relay D1 also is in parallel with LED simultaneously.
Resistance is that an end of the resistance R 13 of 1K Ω also is connected with outside 5V direct voltage, and the input of not gate N2 is connected with the P1.2 port of single-chip microcomputer, and the other end of resistance R 13 is connected with the input of photoelectrical coupler B with the output of not gate N2 together.Accordingly, the output of this photoelectrical coupler B also is divided into two-way, one tunnel direct ground connection, and another road also is connected with the 24V direct voltage of outside behind relay D2, and simultaneously, this relay D2 also is in parallel with LED.
Wherein, two of another normally opened contact K1 of said relay D1 is terminated at the two ends of Energy-saving coil adjustable side, to constitute economize on electricity I shelves when above (be used for supply power voltage be 225V); The two ends of another normally opened contact K2 of relay D2 then are connected to the two ends of another Energy-saving coil adjustable side, to constitute economize on electricity II shelves when being the 190V left and right sides (be used for supply power voltage).
As stated, just can realize the present invention preferably.
Claims (4)
1. power saving apparatus; It is characterized in that: mainly by the voltage acquisition system that is used for SCM system that signal analysis and processing judges, be used to gather voltage signal and produce high-low level, current acquisition system, the data analysis system that is used for regulation voltage acquisition system and current acquisition system level numerical value, the data presentation system that is used to show the various information of whole system that are used to gather current signal and produce triggering level, the energy-saving module system that is used to regulate the multiple spot fluctuation voltage form, described voltage acquisition system, current acquisition system, data analysis system, data presentation system, energy-saving module system all are connected with this SCM system;
Described voltage acquisition system does, an output of voltage sensor is connected with No. 11 ports of comparison amplifier M1 after resistance R 1, and another output of voltage sensor directly is connected with the in-phase input end of comparison amplifier M1; No. 11 ports of comparison amplifier M1 are connected with its No. 4 ports after slide rheostat R3 and resistance R 2, and the sliding end of slide rheostat R3 then is connected with the inverting input of comparison amplifier M1; The output of said comparison amplifier M1 is connected with its No. 11 ports after resistance R 5, and the output of comparison amplifier M1 also is connected with single-chip microcomputer after resistance R 4; No. 11 port ground connection of said comparison amplifier M1, the DC power supply of No. 4 external 15V of port;
Described current acquisition system does, an output of current sensor is connected with No. 11 ports of comparison amplifier M2 after resistance R 8, and another output of current sensor directly is connected with the in-phase input end of comparison amplifier M2; No. 11 ports of comparison amplifier M2 are connected with its No. 4 ports after slide rheostat R9 and resistance R 10, and the sliding end of slide rheostat R9 then is connected with the inverting input of comparison amplifier M2; The output of said comparison amplifier M2 is connected with its No. 11 ports after resistance R 11, and the output of comparison amplifier M2 also is connected with single-chip microcomputer after resistance R 12; No. 11 port ground connection of said comparison amplifier M2, the DC power supply of No. 4 external 15V of port;
Described energy-saving module system does, the external 5V DC power supply of an end of resistance R 14, the input of not gate N1 is connected with single-chip microcomputer, the output of not gate N1 be connected with the input of photoelectrical coupler A again after the other end of resistance R 14 is connected; The output head grounding of this photoelectrical coupler A, another output then is connected with the input of relay D1, and relay D1 also is parallel with photodiode LED;
The external 5V DC power supply of one end of resistance R 13, the input of not gate N2 is connected with single-chip microcomputer, the output of not gate N2 be connected with the input of photoelectrical coupler B again after the other end of resistance R 13 is connected; The output head grounding of this photoelectrical coupler B, another output then is connected with the input of relay D2, and this relay D2 also is parallel with photodiode LED;
The output of said relay D2 and external again 24V DC power supply after the output of relay D1 is connected;
Described data analysis system does, capacitor C 1 be in parallel with electric capacity Y1 again after capacitor C 2 is connected, and the two ends of this electric capacity Y1 also are connected with single-chip microcomputer respectively, the tie point ground connection of capacitor C 2 and capacitor C 1; The normally opened contact K1 of relay D1 is with parallelly connected with capacitor C 3 again after resistance R 6 is connected, and not only ground connection but also directly be connected the then external 5V DC power supply of the other end after the parallel connection with single-chip microcomputer after resistance R 7 of the end after the parallel connection.
2. a kind of power saving apparatus according to claim 1 is characterized in that: described single-chip microcomputer adopts 8 of American ATMEL production and carries the AT89C51 type single-chip microcomputer of watchdog circuit.
3. a kind of power saving apparatus according to claim 2 is characterized in that: the LM324 type comparison amplifier that said comparison amplifier M1 and M2 all adopt the U.S. " state half " company to produce.
4. a kind of power saving apparatus according to claim 2 is characterized in that: described data presentation system is a LCD.
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| CN2009102163248A CN101741140B (en) | 2009-11-25 | 2009-11-25 | Novel power saving system |
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| CN2009102163248A CN101741140B (en) | 2009-11-25 | 2009-11-25 | Novel power saving system |
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| CN101741140A CN101741140A (en) | 2010-06-16 |
| CN101741140B true CN101741140B (en) | 2012-03-07 |
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| CN106374499A (en) * | 2016-09-21 | 2017-02-01 | 武汉承光博德光电科技有限公司 | Novel power-saving system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745272Y (en) * | 2004-11-26 | 2005-12-07 | 李保财 | Intelligent power saving equipment |
| CN201315487Y (en) * | 2008-11-28 | 2009-09-23 | 周杨浩 | Electrical power saving device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2745272Y (en) * | 2004-11-26 | 2005-12-07 | 李保财 | Intelligent power saving equipment |
| CN201315487Y (en) * | 2008-11-28 | 2009-09-23 | 周杨浩 | Electrical power saving device |
Non-Patent Citations (1)
| Title |
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| JP特开2002-10492A 2002.01.11 |
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