CN101169259A - Continuous low power heating electromagnetic oven control structure and its control method - Google Patents
Continuous low power heating electromagnetic oven control structure and its control method Download PDFInfo
- Publication number
- CN101169259A CN101169259A CNA200610063332XA CN200610063332A CN101169259A CN 101169259 A CN101169259 A CN 101169259A CN A200610063332X A CNA200610063332X A CN A200610063332XA CN 200610063332 A CN200610063332 A CN 200610063332A CN 101169259 A CN101169259 A CN 101169259A
- Authority
- CN
- China
- Prior art keywords
- igbt
- mosfet
- chip microcomputer
- electromagnetic oven
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses an electromagnetic furnace control structure realizing continuous low-power heating and the control method, which comprises a synchronous hardware detecting circuit, a single chip and an electromagnetic resonance loop. The electromagnetic resonance loop consists of an electromagnetic furnace energy conversion wire coil and a resonance capacitance as well as a corresponding switch element IGBT/MOSFET and a driving circuit. The invention is characterized in that the synchronous hardware detecting circuit is connected with the single chip and outputs synchronous pulse signals to the single chip; the single chip is connected with the IGBT/MOSFET driving circuit and outputs control signals to the IGBT/MOSFET driving circuit so as to control the IGBT/MOSFET on or off in every oscillating period. The invention has beneficial effects of reducing the stability requirements of the electromagnetic resonance, further enhancing the electric-heat conversion efficiency and prolonging the service life of the IGBT/MOSFET and the whole machine.
Description
Technical field
The present invention relates to a kind of electromagnetic oven, especially a kind of electromagnetic oven control structure and control method thereof of continuous low power heating.
Background technology
As everyone knows, the electric heating energy conversion efficiency of electromagnetic oven has very remarkable advantages for common resistance wire heating furnace.The electric heating energy conversion efficiency of electromagnetic oven is up to more than 90%, and the efficient of conventional, electric-resistance silk heating furnace can be accomplished at most about 60%, and most heat energy has radiate.Therefore, electromagnetic oven will replace existing common electrical heating cooler gradually as a kind of heating cooler of environmental protection.But family expenses electromagnetic oven in the market is subjected to the technical reason restriction, exists stability not enough, burns power tube problems such as (IGBT/MOSFET) easily, thereby has limited its promotion rate on market.
The major defect of existing electromagnetic oven control structure is as follows on the market:
One, the free-running circuit frequency stability is big to stability of a system influence:
(1), for cost consideration, this oscillating circuit basically by resistance, electric capacity, and operational amplifier form.Wherein, resistance, electric capacity the time float, temperature floats parameter and is difficult to accomplish less level, simultaneously, the precision of resistance, capacity cell improves, and causes cost acutely to rise.
(2), in the batch production process, because the frequency of this circuit of adjustment is brought extra cost.
(3), in the long-term use, the variation of temperature, humidity will cause changing based on the EMR electromagnetic resonance loop circuit resonant frequency of electromagnetic oven power conversion drum, when situation is serious, free-running circuit is excessive with EMR electromagnetic resonance loop circuit Frequency Synchronization deviation, causes power device in advance or cross slow conducting and overcurrent/overheated burning.
Two, single-chip microcomputer (MCU) control ability is on the weak side:
(1), in the existing control structure, single-chip microcomputer is generally mainly as the duty cycle adjustment usefulness of PWM, the start trigger point of uncontrollable IGBT/MOSFET.This start trigger point is determined by the synchronization hardware testing circuit basically.
(2), because trigger pulse width (power output requires) is different, in order to guarantee that trigger point testing circuit reliable detection goes out synchronous trigger impulse, in the time of must considering different capacity output and the situation during load, and the moment of this point of the uncontrollable processing of MCU, thereby cause IGBT/MOSFET can occur the situation of high voltage (50V-100V) short circuit conducting inevitably, reduce the energy conversion efficiency of electromagnetic oven, when situation is serious, even can cause IGBT to burn.
Summary of the invention
Development purpose of the present invention is to overcome the existing defective of above-mentioned existing product, and a kind of electromagnetic oven control structure and control method thereof of continuous low power heating are provided.The design main points of technical solution of the present invention are to adopt single-chip microcomputer to control IGBT/MOSFET flexibly in the conducting of each cycle of oscillation in EMR electromagnetic resonance loop constantly and ON time, reach the purpose of stable control electromagnetic oven continuous low power heating.
The electromagnetic oven control structure of a kind of continuous low power heating of the present invention, comprise synchronization hardware testing circuit, single-chip microcomputer, EMR electromagnetic resonance loop, described EMR electromagnetic resonance loop is made up of electromagnetic oven power conversion drum and resonant capacitance and corresponding switch element IGBT/MOSFET and drive circuit, it is characterized in that: described synchronization hardware testing circuit is connected with single-chip microcomputer, gives single-chip microcomputer by synchronization hardware testing circuit output sync pulse signal; Single-chip microcomputer is connected with the IGBT/MOSFET drive circuit, gives the IGBT/MOSFET drive circuit by the single-chip microcomputer output switch control signal, control IGBT/MOSFET in each cycle of oscillation conducting or close.
Described single-chip microcomputer has electromagnetic oven output power control calculation procedure, after single-chip microcomputer receives synchronization pulse, determines to postpone to trigger the IGBT/MOSFET conducting constantly through calculating, and this programming selects to consider following key element according to the electromagnetic oven performance requirement:
(1) current current sinking value;
(2) current supply voltage value;
(3) IGBT/MOSFET crest voltage value power device temperature and change curve characteristic.
The control method of the electromagnetic oven of a kind of continuous low power heating of the present invention, it is characterized in that: this method may further comprise the steps:
(1) after the synchronization hardware testing circuit detects voltage VOB that electromagnetic oven power conversion drum connects switch element IGBT/MOSFET end and drops into certain setting value, produces synchronization pulse and give single-chip microcomputer;
(2) after single-chip microcomputer receives synchronization pulse, the moment of computing relay conducting IGBT/MOSFET;
When (3) time delay was enough, the direct output switch control signal of single-chip microcomputer was to the IGBT/MOSFET drive circuit, conducting IGBT/MOSFET;
When (4) the IGBT/MOSFET ON time was enough, single-chip microcomputer cut out the output of IGBT/MOSFET conducting control signal, closes IGBT/MOSFET;
(5) return step (1), wait for that the synchronization hardware testing circuit is to the signal that makes new advances.
Existing electromagnetic oven control structure and electromagnetic oven control structure scheme contrast table of the present invention:
| Existing electromagnetic oven control structure | Control structure of the present invention | |
| Sync detection circuit | DC voltage after IGBT/MOSFET source voltage and the drum front end 220VAC rectification is relatively exported the low oscillating circuit or the PWM generator that resets opened. | DC voltage after IGBT/MOSFET source voltage and the drum front end 220VAC rectification is relatively exported synchronizing signal to single-chip microcomputer. |
| IGBT conducting control | By vibration PWM circuit taking place and directly control, adds the output hardware protection simultaneously. | Single-chip microcomputer is directly controlled IGBT/MOSFET in the conducting and the close moment in each EMR electromagnetic resonance cycle, adds the output hardware protection simultaneously. |
| The control of electromagnetic oven output power control IGBT/MOSFET ON time | Single-chip microcomputer output-PWM wave mode after rectification, forms and stablizes DC voltage, the dutycycle of decision vibration pwm circuit, the i.e. ON time of IGBT/MOSFET.Thereby decision power output. | Single-chip microcomputer is directly controlled IGBT at the ON time in each EMR electromagnetic resonance cycle, the control power output. |
Beneficial effect of the present invention is:
1, makes full use of the MCU strong functions
(1) stability of MCU operating frequency guarantees the high accuracy of trigger pulse width.
(2) moment of IGBT/MOSFET conducting trigger point control is finished by MCU, not only accurately but also stable, flexible again, puts in place very much.
2, the stability requirement of EMR electromagnetic resonance loop circuit reduces
In the electromagnetic oven scheme of market popularity, require the resonant frequency in EMR electromagnetic resonance loop certain synchronous matching relationship to be arranged now with the frequency that circuit takes place free oscillation PWM.Therefore require the formation component parameter of EMR electromagnetic resonance loop circuit to want stable and consistent.But in electromagnet stove control principle scheme, the frequency change in EMR electromagnetic resonance loop can be very easy to, and is in time adapted to by MCU.Also can adapt to these variations even in use there is parameter to change (1. drum gap 2. capacitance-resistance parameter 3. IGBT/MOSFET is aging etc.) MCU.
3, the IGBT/MOSFET probability of failure greatly reduces
IGBT/MOSFET heating mainly is because IGBT/MOSFET is not to be 0 or conducting when low at source voltage, just just sends permission IGBT Continuity signal once more after being lower than certain voltage.But during the output of different power, the harmonic wave that electromagnetic oven power conversion drum and resonant capacitance produce is different, harmonic wave upwarps easily during small-power, and that high-power waveform drops to minimum point is slower, and the discrete reason that has device parameters when producing in enormous quantities influences the stability of synchronization and the uniformity of signal.Present popular scheme, control IGBT conducting can not change the control firing point according to the waveform of different capacity flexibly fully by hardware circuit control.The situation that occurs the big current lead-through of IGBT/MOSFET easily and burn.In the electromagnetic oven control structure of the present invention, because can adjusting IGBT/MOSFET flexibly, triggers constantly MCU, so can very easily avoid/stop IGBT/MOSFET short circuit conducting under high-tension situation.Significantly reduce the IGBG/MOSFET probability of failure.
4, further improve electric conversion efficiency
The switching loss of IGBT/MPSFET itself is very little, but the loss of its short circuit conducting under high-pressure situations is a kind of no small energy loss.Because new departure can be avoided the high voltage conducting, can lower this loss, further improves electric conversion efficiency.
5, improve IGBT/MOSFET and machine life
Because avoided the appearance of IGBT/MOSFET high voltage short circuit conduction status, the life-span of IGBT/MOSFET can obtain director, machine life also can correspondingly prolong.
6, cancel free oscillation device, saw-toothed wave generator, the PWM generator of existing electromagnetic circuit, saved the components and parts cost, improved the stability of a system, reduced the debugging expense in producing.
Description of drawings
Fig. 1 is a basic functional principle schematic diagram of the present invention
Fig. 2 is that to export continuous power be 2000W control waveform sequential schematic diagram in the present invention
Fig. 3 is that to export continuous power be 1000W control waveform sequential schematic diagram in the present invention
Fig. 4 is that to export continuous power be 100W control waveform sequential schematic diagram in the present invention
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is further specified, the design main points of technical solution of the present invention are to adopt single-chip microcomputer to control IGBT/MOSFET flexibly in the conducting of each cycle of oscillation in EMR electromagnetic resonance loop constantly and ON time, reach the purpose of stable control electromagnetic oven continuous low power heating.
The electromagnetic oven control structure of a kind of continuous low power heating of the present invention, comprise synchronization hardware testing circuit 1, single-chip microcomputer 2, EMR electromagnetic resonance loop, described EMR electromagnetic resonance loop is made up of electromagnetic oven power conversion drum 5 and resonant capacitance 4 and corresponding switch element IGBT/MOSFET drive circuit 3, it is characterized in that: described synchronization hardware testing circuit 1 is connected with single-chip microcomputer 2, gives single-chip microcomputer 2 by synchronization hardware testing circuit 1 output sync pulse signal; Single-chip microcomputer 2 is connected with IGBT/MOSFET drive circuit 3, gives IGBT/MOSFET drive circuit 3 by single-chip microcomputer 2 output switch control signals, control IGBT/MOSFET in each cycle of oscillation conducting or close.
Described single-chip microcomputer 2 has electromagnetic oven output power control calculation procedure, after single-chip microcomputer 2 receives synchronization pulse, determines to postpone to trigger the IGBT/MOSFET conducting constantly through calculating, and this programming selects to consider following key element according to the electromagnetic oven performance requirement:
(1) current current sinking value;
(2) current supply voltage value;
(3) IGBT/MOSFET crest voltage value power device temperature and change curve characteristic.
The control method of the electromagnetic oven of a kind of continuous low power heating of the present invention, it is characterized in that: this method may further comprise the steps:
(1) after synchronization hardware testing circuit 1 detects voltage VOB that electromagnetic oven power conversion drum 5 connects switch element IGBT/MOSFET end and drops into certain setting value, produces synchronization pulse and give single-chip microcomputer 2;
(2) after single-chip microcomputer 2 receives synchronization pulse, the moment of computing relay conducting IGBT/MOSFET;
When (3) time delay was enough, single-chip microcomputer 2 direct output switch control signals were to IGBT/MOSFET drive circuit 3, conducting IGBT/MOSFET;
When (4) the IGBT/MOSFET ON time was enough, single-chip microcomputer 2 cut out the output of IGBT/MOSFET conducting control signal, closes IGBT/MOSFET;
(5) return step 1, wait for that synchronization hardware testing circuit 1 is to the signal that makes new advances.
Below just the power output of electromagnetic circuit of the present invention get arbitrary value, control method of the present invention is described below:
1, the ON time of supposing the IGBT/MOSFET of EMR electromagnetic resonance loop circuit each cycle of oscillation is 20 microseconds, and the mean value of electromagnetic oven heat outputting power in this cycle of oscillation that it causes is 2000W.In long-time (with respect to the thermal inertia of pan for the time), electromagnetic oven has been realized the thermal power of continuous output 2000W.Power output as shown in Figure 2 is continuous 2000W control waveform sequential schematic diagram, and among the figure: the value of VOA (less than 100 microseconds) at short notice is considered as steady state value; The value of VOB changes between the 1000V being about 0V, and is relevant with the instantaneous value of VOA, relevant with the IGBT/MOSFET ON time; IGBT/MOSFET ON time and real output are with electromagnetic oven power conversion drum and oscillating capacitance, and other parameter of circuit, and electromagnetic oven structure is relevant; This figure value of providing is only given an example for signal, and IGBT/MOSFET is that high level is conducting at switch controlling signal, and low level is closed.
If 2 wish that the mean value of heat outputting power is about 1000W, the ON time that the IGBT/MOSFET of EMR electromagnetic resonance loop circuit each cycle of oscillation can be set is 10 microseconds.In long-time (with respect to the thermal inertia of pan for the time), electromagnetic oven has been realized the thermal power of continuous output 1000W.Power output is continuous 1000W control waveform sequential schematic diagram as shown in Figure 3.At this moment, IGBT/MOSFET can too not generate heat owing to the shortening of ON time.
If 3 wish that the mean value of power output is about 100W, the undue heating for fear of IGBT/MOSFET because ON time is too short, take IGBT/MOSFET ON time with 10 microseconds allow 10 milliseconds of EMR electromagnetic resonance loop works (about 300 cycles of oscillation) continuously, stop 90 milliseconds then.So circulation repeatedly.Then in long-time (with respect to the thermal inertia of pan for the time), electromagnetic oven has been realized the thermal power of continuous output 100W.Continuous power output as shown in Figure 4 is the control waveform sequential schematic diagram of 100W, and among the figure: the value of VOA (less than 100 microseconds) at short notice is considered as steady state value; The value of VOB changes between the 1000V being about 0V, and is relevant with the instantaneous value of VOA, relevant with the IGBT/MOSFET ON time; In 100 milliseconds (this time is much smaller than the thermal inertia time of pan), the mean power that outputs to pan is about 100W; IGBT/MOSFET ON time and real output are with electromagnetic oven power conversion drum and oscillating capacitance, and other parameter of circuit, and electromagnetic oven structure is relevant; This figure value of providing is only given an example for signal, and IGBT/MOSFET is that high level is conducting at switch controlling signal, and low level is closed.
4, with reference to said method, electromagnetic oven of the present invention can be realized the impact of performance of Continuous Heat power output valve less than 10W.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Any those skilled in the art, in the scope that does not break away from technical solution of the present invention, any simple modification, equivalent variations and modification according to technical spirit of the present invention is done all still belong in the scope of technical solution of the present invention.
Explanation of nouns:
The following noun that this specification relates to is understood according to description below.
1, EMR electromagnetic resonance loop: in electromagnetic heating circuit, realize the main circuit of electromagnetic conversion, form by electromagnetic oven power conversion drum and resonant capacitance and corresponding switch element IGBT/MOSFET etc.
2, resonant frequency: the free oscillation frequency that refers to the EMR electromagnetic resonance loop
3, cycle of oscillation: in the cycle when referring to the EMR electromagnetic resonance oscillation circuit, mainly comprise several sections: the time of resonant tank makeup energy is given in 1/2 and switch element conducting of resonant frequency time corresponding.
4, electromagnetic oven power conversion drum: also claim heating coil disc.
Claims (3)
1. the electromagnetic oven control structure of continuous low power heating, comprise synchronization hardware testing circuit, single-chip microcomputer, EMR electromagnetic resonance loop, described EMR electromagnetic resonance loop is made up of electromagnetic oven power conversion drum and resonant capacitance and corresponding switch element IGBT/MOSFET drive circuit, it is characterized in that: described synchronization hardware testing circuit is connected with single-chip microcomputer, gives single-chip microcomputer by synchronization hardware testing circuit output sync pulse signal; Single-chip microcomputer is connected with the IGBT/MOSFET drive circuit, gives the IGBT/MOSFET drive circuit by the single-chip microcomputer output switch control signal, control IGBT/MOSFET in each cycle of oscillation conducting or close.
2. the electromagnetic oven control structure of a kind of continuous low power heating according to claim 1, it is characterized in that: described single-chip microcomputer has electromagnetic oven output power control calculation procedure, after single-chip microcomputer receives synchronization pulse, determine to postpone to trigger the IGBT/MOSFET conducting constantly through calculating, this programming selects to consider following key element according to the electromagnetic oven performance requirement:
(1) current current sinking value;
(2) current supply voltage value;
(3) IGBT/MOSFET crest voltage value power device temperature and change curve characteristic.
3. the control method of the electromagnetic oven of continuous low power heating, it is characterized in that: this method may further comprise the steps:
(1) after the synchronization hardware testing circuit detects voltage VOB that electromagnetic oven power conversion drum connects switch element IGBT/MOSFET end and drops into certain setting value, produces synchronization pulse and give single-chip microcomputer;
(2) after single-chip microcomputer receives synchronization pulse, the moment of computing relay conducting IGBT/MOSFET;
When (3) time delay was enough, the direct output switch control signal of single-chip microcomputer was to the IGBT/MOSFET drive circuit, conducting IGBT/MOSFET;
When (4) the IGBT/MOSFET ON time was enough, single-chip microcomputer cut out the output of IGBT/MOSFET conducting control signal, closes IGBT/MOSFET;
(5) return step (1), wait for that the synchronization hardware testing circuit is to the signal that makes new advances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610063332XA CN101169259A (en) | 2006-10-27 | 2006-10-27 | Continuous low power heating electromagnetic oven control structure and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610063332XA CN101169259A (en) | 2006-10-27 | 2006-10-27 | Continuous low power heating electromagnetic oven control structure and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101169259A true CN101169259A (en) | 2008-04-30 |
Family
ID=39389958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610063332XA Pending CN101169259A (en) | 2006-10-27 | 2006-10-27 | Continuous low power heating electromagnetic oven control structure and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101169259A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066097A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on soc chip |
| CN102356994A (en) * | 2011-08-05 | 2012-02-22 | 佛山市顺德区美的电热电器制造有限公司 | Communication method for induction heating device and cooker |
| CN102711298A (en) * | 2012-05-23 | 2012-10-03 | 美的集团有限公司 | Heating control device and control method for induction cooker |
| CN103916997A (en) * | 2013-01-05 | 2014-07-09 | 美的集团股份有限公司 | Electromagnetic induction heating device and control method thereof |
| CN106136844A (en) * | 2015-04-07 | 2016-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| CN106937423A (en) * | 2015-12-31 | 2017-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its laser heating control method |
| CN107087321A (en) * | 2017-05-19 | 2017-08-22 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT (insulated Gate Bipolar transistor) and induction cooker |
| CN112577079A (en) * | 2019-09-30 | 2021-03-30 | 浙江绍兴苏泊尔生活电器有限公司 | Control method of induction cooker and induction cooker |
-
2006
- 2006-10-27 CN CNA200610063332XA patent/CN101169259A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066097A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Electromagnetic oven circuit based on soc chip |
| CN102356994A (en) * | 2011-08-05 | 2012-02-22 | 佛山市顺德区美的电热电器制造有限公司 | Communication method for induction heating device and cooker |
| CN102356994B (en) * | 2011-08-05 | 2013-12-18 | 佛山市顺德区美的电热电器制造有限公司 | Communication method for induction heating device and cooker |
| CN102711298A (en) * | 2012-05-23 | 2012-10-03 | 美的集团有限公司 | Heating control device and control method for induction cooker |
| CN103916997A (en) * | 2013-01-05 | 2014-07-09 | 美的集团股份有限公司 | Electromagnetic induction heating device and control method thereof |
| CN103916997B (en) * | 2013-01-05 | 2016-02-10 | 美的集团股份有限公司 | Electromagnetic induction heater and control method thereof |
| CN106136844A (en) * | 2015-04-07 | 2016-11-23 | 佛山市顺德区美的电热电器制造有限公司 | Cooking apparatus and the electric heater unit for cooking apparatus |
| CN106937423A (en) * | 2015-12-31 | 2017-07-07 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its laser heating control method |
| CN107087321A (en) * | 2017-05-19 | 2017-08-22 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT (insulated Gate Bipolar transistor) and induction cooker |
| CN107087321B (en) * | 2017-05-19 | 2023-06-27 | 浙江绍兴苏泊尔生活电器有限公司 | Method for adjusting hard turn-on voltage of IGBT and induction cooker |
| CN112577079A (en) * | 2019-09-30 | 2021-03-30 | 浙江绍兴苏泊尔生活电器有限公司 | Control method of induction cooker and induction cooker |
| CN112577079B (en) * | 2019-09-30 | 2022-06-14 | 浙江绍兴苏泊尔生活电器有限公司 | Control method of induction cooker and induction cooker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101169259A (en) | Continuous low power heating electromagnetic oven control structure and its control method | |
| Shen et al. | Design of a two-stage low-frequency square-wave electronic ballast for HID lamps | |
| CN101462348B (en) | Electromagnetic heating system of injection mould machine | |
| CN103426683B (en) | The time relay of Metal halogen lamp class load | |
| CN102300349A (en) | Electromagnetic sensing heating device and method thereof | |
| CN103259443B (en) | Limited dual-polarity-controlled full bridge inverter | |
| CN204145789U (en) | Electromagnetic Heating control device and electromagnetic heating apparatus | |
| CN102709118B (en) | Economizer of alternative-current contactor | |
| CN102510595A (en) | Control method of semiconductor microwave oven | |
| CN103916997B (en) | Electromagnetic induction heater and control method thereof | |
| CN104952667A (en) | Intelligent electromagnetic switch control device for low voltage power supply system | |
| CN105517219A (en) | Control method and device of microwave oven circuit and microwave oven | |
| CN2826891Y (en) | Control structure of electromagnetic oven | |
| CN204539512U (en) | Electromagnetic heater and the electromagnetic oven with it | |
| CN116722764A (en) | Design method of high-repetition-frequency pulse power supply | |
| CN1135684C (en) | Electromagnetic cooker | |
| CN209419902U (en) | Electromagnetic heater and its resonance circuit and control circuit | |
| CN110278622B (en) | Control circuit for electromagnetic heating low-power continuous output | |
| CN210469778U (en) | Electromagnetic heating low-power continuous output control circuit | |
| CN208400024U (en) | three-stage power supply | |
| CN204206514U (en) | A kind of electromagnetic induction heating energy-saving equipment | |
| CN2836392Y (en) | High-frequency electromagnetic fine controlled wide temperature range heater | |
| CN108307565A (en) | A kind of LED lamp switching circuit and control method preventing relay contact ablation | |
| CN214069551U (en) | Electric heating equipment for kitchen and control device thereof | |
| WO2017113656A1 (en) | Microwave oven circuit, method and device for controlling microwave oven circuit and microwave oven |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080430 |