CN101409959B - Intelligence control circuit for quasi-resonance electromagnet water heater - Google Patents
Intelligence control circuit for quasi-resonance electromagnet water heater Download PDFInfo
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Abstract
The invention provides an intelligent control circuit used for a quasi-harmonic electromagnetic water heater; the intelligent control circuit comprises a main control circuit, a do-work circuit, a power amplification circuit, a signal control circuit, a display circuit and a power circuit; the main control circuit is respectively connected with the signal control circuit, the display circuit and the power circuit; the do-work circuit is respectively connected with the power circuit and the power amplification circuit; wherein, the do-work circuit comprises a high-frequency oscillation circuit consisting of a high-frequency electromagnetic coil and an inductor, and an IGBT module which drives the high-frequency oscillation circuit; wherein, the coil center of the high-frequency electromagnetic coil is provided with a do-work core. The intelligent control circuit can generate the heat by electromagnetic induction and has the unique advantages of automatic power adjustment, fast heat transmission, high heat efficiency, safety, energy saving, convenient operation and long service life, has various strict and accurate controls, has all protection and recognition measures in place and a high degree of intellectualization.
Description
Technical field
The present invention relates to a kind of control circuit that is used for electric heater, specifically, relate to a kind of intelligence control circuit for quasi-resonance electromagnet water heater.
Background technology
Water heater of the prior art can be divided into storage-type, Instant heating type, burner formula, wherein, storage-type electric water heater is long heating time, the long-time phenomenon that has insufficient water of using in case water storage can not use up, just causes hot water residual, aqueous metamorphism, easily the breeding bacterium is unfavorable for health, and wastes energy and resource; Immediately heating water heater power is too big, power consumption is big, and the heat efficiency is low, and calandria is too concentrated, easily plays dirt, and the life-span is short; Burner formula water heater has unsafe factor, and damage ratio is more serious;
At above existing problem; progressively released a kind of water heater on the market with the electromagnetism mode of heating; at such water heater, but also there is not a kind of brand-new, intelligent high, the perfect automatic power adjustment of protection, contactless support circuit of complete machine at present.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution that more is tending towards always.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, thereby but provide a kind of automatic power adjustment, contactless, perfect, the intelligent high intelligence control circuit for quasi-resonance electromagnet water heater of protection.
The objective of the invention is to realize by following technical scheme:
A kind of intelligence control circuit for quasi-resonance electromagnet water heater, this intelligence control circuit comprises governor circuit, acting circuit, power amplification circuit, signal control circuit, display circuit and power circuit, described governor circuit connects signal control circuit, display circuit and power circuit respectively, and described acting circuit connects power circuit and power amplification circuit respectively;
Wherein, described acting circuit comprises high-frequency oscillating circuits of being made up of high-frequency electromagnetic coil and inductance and the IGBT module that drives high-frequency oscillating circuits, and wherein, the hub of a spool of described high-frequency electromagnetic coil is provided with the acting iron core;
Described governor circuit is used for to described signal control circuit output pwm control signal;
Described signal control circuit connects the acting circuit, is used to obtain pulse signal, acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization;
Described signal control circuit connects power amplification circuit, described signal control circuit be used for will input pwm control signal, pulse signal optimization after to described power amplification circuit input pulse control signal;
Described signal control circuit is used for to governor circuit input acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization;
Described power amplification circuit is used for the pulse control signal amplification of input and exports to described acting circuit; The conducting under described power amplification circuit effect of described IGBT module makes the logical high-frequency current of described high-frequency electromagnetic coil with the generation high frequency magnetic field, and makes acting iron core heating acting;
Described display circuit is used to accept, show the display message of described governor circuit transmission; Described power circuit provides power supply for this intelligence control circuit.
Based on above-mentioned; this intelligence control circuit also comprises overvoltage crowbar; described overvoltage crowbar one end connects described power circuit; be used to gather described power circuit output voltage; the described overvoltage crowbar other end connects governor circuit, is used for power circuit abnormal voltage signal is exported to described governor circuit.
Based on above-mentioned; this intelligence control circuit also comprises current foldback circuit; described current foldback circuit one end connects described power circuit; be used to gather described power circuit output current; the described current foldback circuit other end connects governor circuit, is used for power circuit abnormal current signal is exported to described governor circuit.
Based on above-mentioned; this intelligence control circuit also comprises under-voltage protecting circuit; described under-voltage protecting circuit one end connects described power circuit; be used to gather described power circuit output current; the described under-voltage protecting circuit other end connects governor circuit and signal control circuit respectively, is respectively applied for the signal output to described governor circuit input sync signal and the described signal control circuit of control.
Based on above-mentioned; this intelligence control circuit also comprises high-voltage impulse protection circuit; described high-voltage impulse protection circuit one end connects the IGBT module collector electrode of described acting circuit; be used to gather described acting circuit voltage; the described high-voltage impulse protection circuit other end connects signal control circuit, is used to control the signal output of described signal control circuit.
Based on above-mentioned, this intelligence control circuit also comprises temperature signal collection circuit, and described temperature signal rice collector connects governor circuit, is used to gather the working power of water temperature signal and fine setting acting circuit.
Based on above-mentioned, this intelligence control circuit also comprises the audible alarm circuit, and described audible alarm circuit connects governor circuit, is used for abnormal signal and reports to the police.
Based on above-mentioned, this intelligence control circuit also comprises the operating state indicating circuit, and described operating state indicating circuit connects governor circuit, is used to show the operating state of circuit of doing work.
Based on above-mentioned, this intelligence control circuit also comprises input control circuit, and described input control circuit connects governor circuit, is used for the working power of artificial fine setting acting circuit.
Based on above-mentioned, this intelligence control circuit also comprises time-delay temperature-control water outlet circuit, is used to control the water outlet of quasi-resonance electromagnet water heater; Described time-delay temperature-control water outlet circuit connects the high-frequency electromagnetic coil of described acting circuit, is used to gather DC power supply and thinks described time-delay temperature-control water outlet circuit power supply.
The present invention has outstanding substantive distinguishing features and obvious improvement with respect to prior art, specifically, this intelligence control circuit adopts electromagnetic induction heating, its acting solenoid around PPR hot-water line outside is connected with high-frequency current, under main power tube promotes, under the effect of resonant capacitance, can produce powerful high frequency magnetic field, make the METAL HEATING PROCESS body that is suspended in the PPR hot-water line produce powerful eddy current, heating acting under the choked flow effect, it has automatic power adjustment, it is fast to conduct heat, heat efficiency height, energy-saving safe, easy to operate, the unique advantage that life-span is long, its various controls are tight, accurately, various protections, the identification measure puts in place, intelligent degree height;
This intelligence control circuit is provided with protective circuit and various identification circuits such as overvoltage, overcurrent, under-voltage, high-voltage pulse, has comparatively comprehensively ensured safety, the fault-free running of water heater, but also has been provided with double-deck electromagnetic shielding, guarantees personal safety;
This intelligence control circuit is provided with touch key-press on operating surface, make water, electricity, machine, human body four separation, is beneficial to convenient the use on the one hand, can guarantee personal safety on the other hand;
In high-power electronic device, usually there is certain hidden danger in the dynamic contact point in the circuit, and power major break down rate more is just high more, and excellent its is in the place of environmental condition difference, and problem is just more outstanding; The full machine noncontacting switch of this intelligence control circuit, in the circuit, various piece connects does not have dynamic contact point, all is to fix with screw to reach the connection that plug-in unit is realized each unit, secondly, implements in the printed circuit mode between each unit and the element; Promptly, export up to final acting from the alternating current input of 220 volts/50-60 of electrical network hertz, without any contact, also just do not have the problem of contact fault, power output, power supply starting, water outlet automatically, disorderly closedown, orderly closedown, temperature adjustment, the wind-cooling heat dissipating starting that comprises electromagnet water heater such as closes at circuit; The contactless design of this intelligence control circuit is the optimal design in the electronic circuit, is the trend of electronic product, electronic product development.
Description of drawings
Fig. 1 is an operation principle block diagram of the present invention;
Fig. 2 is one of electrical block diagram of the present invention;
Fig. 3 is two of an electrical block diagram of the present invention;
Fig. 4 is three of an electrical block diagram of the present invention;
Fig. 5 is the circuit diagram of Dc low voltage power supply of the present invention;
Fig. 6 is the circuit diagram of time-delay temperature-control water outlet circuit of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, a kind of intelligence control circuit for quasi-resonance electromagnet water heater, this intelligence control circuit comprises governor circuit, acting circuit, power amplification circuit, signal control circuit, display circuit and power circuit, described governor circuit connects signal control circuit, display circuit and power circuit respectively, and described acting circuit connects power circuit and power amplification circuit respectively;
Wherein, the single machine unit circuit that described governor circuit is made up of single-chip microcomputer and peripheral auxiliary circuits thereof includes single-chip microcomputer 1CPU, crystal oscillator 1Y.
Described acting circuit comprises high-frequency oscillating circuits of being made up of high-frequency electromagnetic coil 3L5,3L6 and inductance 3C5,3C6 and four groups of IGBT module 3Q1,3Q2,3Q3, the 3Q4 that drives high-frequency oscillating circuits, described IGBT module 3Q1,3Q2 drive the high-frequency oscillating circuits of being made up of high-frequency electromagnetic coil 3L5 and inductance 3C5, and described IGBT module 3Q3,3Q4 drive the high-frequency oscillating circuits of being made up of high-frequency electromagnetic coil 3L6 and inductance 3C6;
Wherein, the hub of a spool of described high-frequency electromagnetic coil is provided with the acting iron core, and during installation, at the external body of insulated cavity, and the iron core that will do work is arranged in the insulation cavity with described high-frequency electromagnetic coil uniform winding, and described insulation cavity is as the water heater calandria that is filled with water;
Described acting circuit also includes resistance 3R1,3R2,3R3,3R4,3R5,3R6,3R7,3R8, and described high-frequency electromagnetic coil 3L5,3L6 are connected between LOAD contact and LOAD2 contact, the LOAD1 contact.
Described power amplification circuit includes resistance 2R44, electric capacity 2C29,2C30,2C42, diode 2D15,2D16, and NPN type triode 2Q4, positive-negative-positive triode 2Q5; Described NPN type triode 2Q4, positive-negative-positive triode 2Q5 emitter link to each other and constitute push-pull power amplifier circuit.
Described signal control circuit includes resistance 2R13,2R18,2R19,2R20,2R21,2R22,2R23,2R24,2R24,2R35, electric capacity 2C15,2C16,2C17,2C18,2C19,2C20,2C21,2C22, diode 2D9,2D10,2D11, and four voltage comparator 2IC1B, 2IC1C; Described four voltage comparator 2IC1B, two inputs are got the voltage that continuous high frequency changes from arbitrary high-frequency electromagnetic coil two ends, export rectangular pulse signal then, and with the saw-toothed wave generator acting in conjunction of forming by resistance 2R21, resistance 2R22, electric capacity 2C19 and diode 2D9, make that four voltage comparator 2IC1C obtain having certain frequency, the pulse signal of phase place, described four voltage comparator 2IC1C export to described power amplification circuit after this pulse signal and pwm control signal by described governor circuit output are compared, optimize.
Described governor circuit is used for to four voltage comparator 2IC1C "+" of described signal control circuit end output pwm control signal;
Described signal control circuit is used to obtain pulse signal, acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization by the high-frequency electromagnetic coil two ends that four voltage comparator 2IC1B connect the acting circuit; Described pulse signal is obtained by four voltage comparator 2IC1C "-" end, described acting circuit operate as normal synchronizing signal is exported by four voltage comparator 2IC1B outputs, and the normal identification signal of described acting circuit initialization is exported behind electric capacity 2C18 by four voltage comparator 2IC1B "-" end.
Four voltage comparator 2IC1C outputs of described signal control circuit connect the power amplification circuit input, and four voltage comparator 2IC1C of described signal control circuit are used for the pwm control signal of input, pulse signal are compared, optimize the back to described power amplification circuit input pulse control signal;
Described signal control circuit is used for to governor circuit input acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization, so that governor circuit is discerned, judged;
Described power amplification circuit is used for the pulse control signal amplification of input and exports to described acting circuit; Described IGBT module base stage connects described power amplification circuit output, and conducting under described power amplification circuit effect, makes the logical high-frequency current of described high-frequency electromagnetic coil with the generation high frequency magnetic field, and makes acting iron core heating acting;
Described display circuit is used to accept, show the display message of described governor circuit transmission; This intelligence control circuit also comprises input control circuit, and described input control circuit connects governor circuit, is used for the working power of artificial fine setting acting circuit; The working power of fine setting acting circuit is to finish by the pwm control signal of described governor circuit output;
Described display circuit, input control circuit include TM1628 and show integrated circuit, 4069 membrane keyboard control integrated circuit, touch display screen, water flow switch, plus-minus switch and peripheral auxiliary electron element, include diode 1D1,1D2,1D3,1D4, resistance 1R1,1R2,1R3,1R4,1R5,1R6,1R7, touch-screen button 1K1,1K2, electric capacity 1C3,1C7,1C8 or the like.
Described power circuit comprises acting power supply and Dc low voltage power supply, and it provides power supply for the acting circuit with this intelligence control circuit;
This acting power supply includes full bridge rectifier 3DS, associate coil 3L1, inductance 3L2,3L3, insurance 3F1, piezo-resistance 3FR1, and electric capacity 3C1,3C2,3C3,3C4; Piezo-resistance 3FR1 has the absorption of surging, and is beneficial to protection back level electronic component; Associate coil 3L1 and electric capacity 3C1,3C2 constitute net electrical interference absorption circuit, and the high-frequency signal that produces in the time of can effectively preventing work returns net; Inductance 3L2,3L3 and electric capacity 3C3,3C4 form L type filter circuit;
As shown in Figure 5, this Dc low voltage power supply includes diode 2D22,2D23,2D24,2D25,2D26,2D27, resistance R 53,2R54,2R52, electric capacity 2C47,2C48,2C39,2C38,2C41,2C43,2C44,2C45,2C46,2C40, voltage stabilizing didoe 2ZD2, three-terminal regulator block 2IC37805, and Viper12A chip 2IC2, transformer 2T2; Power supply gets direct current through rectifying and wave-filtering, and direct current is through transformer 2T2 transformation, and again through Viper12A chip 2IC2, by resistance 2R52 output+18V Dc low voltage power supply, another road is through three-terminal regulator block 2IC37805 output+5V Dc low voltage power supply.
Based on above-mentioned, this intelligence control circuit also comprises overvoltage crowbar, described overvoltage crowbar one end connects described power circuit output end, be used to gather described power circuit output voltage, the described overvoltage crowbar other end connects governor circuit, be used for power circuit abnormal voltage signal is exported to described governor circuit, and make described governor circuit after inter-process, control the pwm control signal of output;
This overvoltage crowbar includes diode 2D1,2D2,2D3, resistance 2R1,2R2,2R3, and electric capacity 2C13,2C14.
Based on above-mentioned, this intelligence control circuit also comprises current foldback circuit, described current foldback circuit one end connects described power circuit, be used to gather described power circuit output current, the described current foldback circuit other end connects governor circuit, be used for power circuit abnormal current signal is exported to described governor circuit, and make described governor circuit after inter-process, control the pwm control signal of output;
This current foldback circuit includes diode 2D4,2D5,2D6,2D7,2D8, resistance 2R4,2R5,2R6,2RV1, electric capacity 2C8,2C9, and D.C mutual-inductor 3T1.
Based on above-mentioned, this intelligence control circuit also comprises under-voltage protecting circuit, described under-voltage protecting circuit one end connects described power circuit, be used to gather described power circuit output current, the described under-voltage protecting circuit other end connects governor circuit and signal control circuit respectively, is respectively applied for to described governor circuit input sync signal and the directly signal output of the described signal control circuit of control;
This under-voltage protecting circuit includes resistance 2R7,2R8,2R9,2R10,2R11,2R12, electric capacity 2C10,2C11,2C12, and four voltage comparator 2IC1D.
Based on above-mentioned, this intelligence control circuit also comprises high-voltage impulse protection circuit, described high-voltage impulse protection circuit one end connects the IGBT module collector electrode of described acting circuit, be used to gather described acting circuit voltage, the described high-voltage impulse protection circuit other end connects signal control circuit or governor circuit signal output part, is used for directly controlling the signal output of described signal control circuit;
This high-voltage impulse protection circuit includes resistance 2R30,2R31,2R31,2R33,2R34, and four voltage comparator 2IC1A.
Based on above-mentioned, this intelligence control circuit also comprises temperature signal collection circuit, and described temperature signal collection circuit connects governor circuit, is used to receive the signal of described governor circuit and gathers water temperature signal and the working power of fine setting acting circuit; The working power of fine setting acting circuit is to finish by the pwm control signal of described governor circuit output;
This temperature signal collection circuit includes resistance 2R42,2R45,2R46,2R47,2R48,2R38, electric capacity 2C31,2C32,2C23,2C27, and photoelectrical coupler U2.
Based on above-mentioned, this intelligence control circuit also comprises the audible alarm circuit, and described audible alarm circuit connects governor circuit, is used for abnormal signal and reports to the police;
This audible alarm circuit includes resistance 2R40,2R39,2R41, electric capacity 2C28, and buzzer BELL and triode 2Q3.
Based on above-mentioned, this intelligence control circuit also comprises the operating state indicating circuit, and described operating state indicating circuit connects governor circuit, is used to show the operating state of circuit of doing work;
This operating state indicating circuit includes resistance 2R37, and indicator light.
Based on above-mentioned, as shown in Figure 6, this intelligence control circuit also comprises time-delay temperature-control water outlet circuit, is used to control the water outlet of quasi-resonance electromagnet water heater; Described time-delay temperature-control water outlet circuit connects the high-frequency electromagnetic coil of described acting circuit, is used to gather DC power supply and thinks described time-delay temperature-control water outlet circuit power supply;
Described time-delay temperature-control water outlet circuit comprises the triode Q1 that water solenoid valve, cooling-water temperature sensor, cooling-water temperature sensor control, the delay circuit of full bridge rectifier, controllable silicon QT1, full bridge rectifier control, triode Q6, Dc low voltage power supply and the water outlet solenoid valve power supply of delay circuit control, wherein, the conducting of described triode control silicon controlled, described controllable silicon is connected the both positive and negative polarity of full bridge rectifier, and described Dc low voltage power supply is collected in the high-frequency electromagnetic coil; When the both positive and negative polarity short circuit or the short circuit of full bridge rectifier, then go out water solenoid valve conducting under water outlet solenoid valve power supply, thereby reach the purpose when the control water heater goes out hot water.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (10)
1. intelligence control circuit for quasi-resonance electromagnet water heater, it is characterized in that: this intelligence control circuit comprises governor circuit, acting circuit, power amplification circuit, signal control circuit, display circuit and power circuit, described governor circuit connects signal control circuit, display circuit and power circuit respectively, and described acting circuit connects power circuit and power amplification circuit respectively;
Wherein, described acting circuit comprises high-frequency oscillating circuits of being made up of high-frequency electromagnetic coil and inductance and the IGBT module that drives high-frequency oscillating circuits, and wherein, the hub of a spool of described high-frequency electromagnetic coil is provided with the acting iron core;
Described governor circuit is used for to described signal control circuit output pwm control signal;
Described signal control circuit connects the acting circuit, is used to obtain pulse signal, acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization;
Described signal control circuit connects power amplification circuit, described signal control circuit be used for will input pwm control signal, pulse signal optimization after to described power amplification circuit input pulse control signal;
Described signal control circuit is used for to governor circuit input acting circuit operate as normal synchronizing signal and the normal identification signal of acting circuit initialization;
Described power amplification circuit is used for the pulse control signal amplification of input and exports to described acting circuit; The conducting under described power amplification circuit effect of described IGBT module makes the logical high-frequency current of described high-frequency electromagnetic coil with the generation high frequency magnetic field, and makes acting iron core heating acting;
Described display circuit is used to accept, show the display message of described governor circuit transmission; Described power circuit provides power supply for this intelligence control circuit.
2. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1; it is characterized in that: this intelligence control circuit also comprises overvoltage crowbar; described overvoltage crowbar one end connects described power circuit; be used to gather described power circuit output voltage; the described overvoltage crowbar other end connects governor circuit, is used for power circuit abnormal voltage signal is exported to described governor circuit.
3. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1; it is characterized in that: this intelligence control circuit also comprises current foldback circuit; described current foldback circuit one end connects described power circuit; be used to gather described power circuit output current; the described current foldback circuit other end connects governor circuit, is used for power circuit abnormal current signal is exported to described governor circuit.
4. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1; it is characterized in that: this intelligence control circuit also comprises under-voltage protecting circuit; described under-voltage protecting circuit one end connects described power circuit; be used to gather described power circuit output current; the described under-voltage protecting circuit other end connects governor circuit and signal control circuit respectively, is respectively applied for the signal output to described governor circuit input sync signal and the described signal control circuit of control.
5. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1; it is characterized in that: this intelligence control circuit also comprises high-voltage impulse protection circuit; described high-voltage impulse protection circuit one end connects the IGBT module collector electrode of described acting circuit; be used to gather described acting circuit voltage; the described high-voltage impulse protection circuit other end connects signal control circuit, is used to control the signal output of described signal control circuit.
6. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1, it is characterized in that: this intelligence control circuit also comprises temperature signal collection circuit, described temperature signal collection circuit connects governor circuit, is used to gather the working power of water temperature signal and fine setting acting circuit.
7. according to one of claim 1-6 described intelligence control circuit for quasi-resonance electromagnet water heater, it is characterized in that: this intelligence control circuit also comprises the audible alarm circuit, and described audible alarm circuit connects governor circuit, is used for abnormal signal and reports to the police.
8. according to one of claim 1-6 described intelligence control circuit for quasi-resonance electromagnet water heater, it is characterized in that: this intelligence control circuit also comprises the operating state indicating circuit, described operating state indicating circuit connects governor circuit, is used to show the operating state of circuit of doing work.
9. according to one of claim 1-6 described intelligence control circuit for quasi-resonance electromagnet water heater, it is characterized in that: this intelligence control circuit also comprises input control circuit, described input control circuit connects governor circuit, is used for the working power of artificial fine setting acting circuit.
10. intelligence control circuit for quasi-resonance electromagnet water heater according to claim 1 is characterized in that: this intelligence control circuit also comprises time-delay temperature-control water outlet circuit, is used to control the water outlet of quasi-resonance electromagnet water heater; Described time-delay temperature-control water outlet circuit connects the high-frequency electromagnetic coil of described acting circuit, is used to gather DC power supply and thinks described time-delay temperature-control water outlet circuit power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102309813A CN101409959B (en) | 2008-11-14 | 2008-11-14 | Intelligence control circuit for quasi-resonance electromagnet water heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102309813A CN101409959B (en) | 2008-11-14 | 2008-11-14 | Intelligence control circuit for quasi-resonance electromagnet water heater |
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| CN101409959A CN101409959A (en) | 2009-04-15 |
| CN101409959B true CN101409959B (en) | 2011-05-04 |
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| CN102946654B (en) * | 2012-11-14 | 2015-11-04 | 明达实业(厦门)有限公司 | A kind of half-wave electromagnetic field generator |
| CN106332340B (en) * | 2015-06-30 | 2022-08-19 | 深圳市泰金田科技有限公司 | Electromagnetic heating device and heating method thereof |
| CN111211795B (en) * | 2020-02-29 | 2020-12-22 | 宁波市建工检测有限公司 | Green building supervisory equipment based on big data |
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2008
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2224368Y (en) * | 1994-11-04 | 1996-04-10 | 贺贵腾 | Electromagnetic water-heating device |
| CN2239580Y (en) * | 1996-01-17 | 1996-11-06 | 阎慧旗 | Hi-frequency electromagnetic heater |
| US6198642B1 (en) * | 1999-10-19 | 2001-03-06 | Tracewell Power, Inc. | Compact multiple output power supply |
| EP1581029A1 (en) * | 2002-12-02 | 2005-09-28 | Kabushiki Kaisha Toshiba | Induction heating cooking appliance |
| CN2842966Y (en) * | 2005-09-20 | 2006-11-29 | 广州擎天实业有限公司 | Electro magnetic rice-cooker controller |
| CN201332516Y (en) * | 2008-11-14 | 2009-10-21 | 张军才 | Quasi-resonance electro-magnetic water-heater intelligent control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101409959A (en) | 2009-04-15 |
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