CN1464765A - Microwave oven and control method thereof - Google Patents
Microwave oven and control method thereof Download PDFInfo
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- CN1464765A CN1464765A CN02122476A CN02122476A CN1464765A CN 1464765 A CN1464765 A CN 1464765A CN 02122476 A CN02122476 A CN 02122476A CN 02122476 A CN02122476 A CN 02122476A CN 1464765 A CN1464765 A CN 1464765A
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- power
- magnetron
- electric current
- microwave oven
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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
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention discloses a microwave oven comprising a magnetron, a power supply member for supplying AC and a high voltage transformer for generating high voltage using the AC supplied by the power supply member. The microwave oven also contains a power control member for ceasing the power supply to the magnetron when the voltage provided by the power supply member exceeds the previously determined voltage. By using the arrangement, the microwave oven can prevent the situation that the input power exceeds the predetermined power caused by the outside weather or geographical influences, thus improves the stability of the circuit.
Description
Technical field
The present invention relates to microwave oven and control method thereof, interchange (AC) voltage that particularly can prevent to be applied to power pack surpasses the microwave oven and the control method thereof of the upper voltage limit that allows.
Background technology
Usually, the commercial ac power that provides from power unit is applied to the primary coil of core type high-tension transformer, and produces high voltage at secondary winding and operate microwave oven.The high voltage heating that produces in the secondary winding of high-tension transformer is arranged on the cathode filament in the magnetron, and by the high voltage oscillating magnetic flux keyholed back plate that applies, thereby produce microwave energy.When microwave energy ran into water in the confined space or any hydrous matter (for example, food etc.), this microwave energy was converted into heat energy, thereby is used for cooked food.
Fig. 5 is the signal controlling party block diagram of conventional microwave oven.As shown in the drawing, conventional microwave oven comprises the power unit 101 that commercial ac power is provided, the magnetron 109 that produces high-tension high-tension transformer 107 and generate electromagnetic waves by the commercial ac power that provides from power unit 101 by the high voltage that produces in the high-tension transformer 107.Between power unit 101 and high-tension transformer 107, form and be used for the rectification/smooth 103 of rectification and level and smooth commercial ac power and the inverter section 105 that direct current (DC) is converted to high-frequency alternating current by rectification/smooth 103.Also be provided with the inverter control section 115 of control inverter 105 in addition and the signal generating portion 127 of control signal is provided to inverter control section 115.
Inverter control section 115 comprises the D/A part 125 that is used for the control signal that signal generating portion 127 generates is converted to analog signal, apply the resonance test section 121 of the control signal of changing by D/A part 125 to it, the frequency of control resonance test section 121 detected control signals and with the output control part 119 of its output, and be used for changing output control part 119 outputs control signal cycle and the signal that changes is inputed to the oscillating part 117 of inverter section 105.Inverter control section 115 also comprises the ON/OFF actuating section 123 of controlling the soft start that opens or closes operation and control oscillating part 117 of oscillating part 117 according to the control signal that generates in the signal generating portion 127.
Yet, in conventional microwave oven, under the situation of voltage above predetermined permission upper voltage limit of the commercial ac power that is input to power unit, may surpass the tolerable load capacity of its each several part circuit.In this case, this overvoltage can cause circuit abnormality.
In addition, will be smoothed to direct current by the commercial ac power of power unit input, and the direct current by rectification/smooth conversion surpasses predeterminedly can allow electric current the time, can destroy the stability of circuit by rectification/smooth.
Summary of the invention
Consider that above-mentioned shortcoming finished the present invention, the purpose of this invention is to provide and a kind of can surpassing under the situation of admissible upper voltage limit be cut to the microwave oven of this power supply at input voltage, and the method for controlling this microwave oven.
Another object of the present invention provides a kind ofly can cut off the overcurrent power supply, thereby improves the delivery efficiency of circuit and the microwave oven of protective circuit, and this control method of microwave oven.
This purpose of the present invention and other purpose can have magnetron by providing, the power unit of commercial ac power is provided, and the microwave oven that the commercial ac power that utilizes power unit to provide produces high-tension high-tension transformer is realized, this microwave oven comprises and surpasses predeterminedly can allow upper voltage limit the time when its voltage of determining that power unit provides, cuts off the power control part branch to the magnetron power supply.
This microwave oven preferably also comprises commercial ac power is carried out rectification and level and smooth rectification/smooth; Direct current by rectification/smooth is converted to the inverter section of high-frequency alternating current; And when surpass the predetermined inverter control section that cuts off can allow electric current the time to the magnetron power supply through the galvanic electric current of over commutation/smooth.
Microwave oven preferably also be included in the power ratio that provides from the power of inverter output and power unit after, detect the resonance test section of the abnormality of the power that inverter section exports; And the signal generating portion that produces control signal; Wherein determine in the resonance test section detected signal and occur when unusual that the inverter control section interrupts the control signal of signal generating portion generation is applied to inverter section when it.
Preferably, power control section divides the electric current of the input power of determining high-tension transformer whether can allow electric current above predetermined, to determine that electric current has surpassed predetermined can allow electric current the time when it, cut-out is to the power supply of magnetron, and recovers the operation to magnetron after magnetron is through the time-out of one section predetermined period of time again.
This microwave oven preferably also comprises and is used for determining whether the voltage that power unit provides surpasses the predetermined high voltage test section that can allow upper voltage limit.
The high voltage test section preferably includes voltage and the predetermined comparator that can allow upper voltage limit that the comparison power unit provides.
According to another embodiment of the invention, this purpose and other purpose can be by the controlled microwave stove be provided method from realization, this microwave oven comprises magnetron, the power unit of commercial ac power is provided, and the commercial ac power that utilizes power unit to provide produces high-tension high-tension transformer, and the method comprising the steps of: determining whether voltage that power unit provides surpasses predeterminedly can allow upper voltage limit; When surpassing to cut off when being scheduled to allow upper voltage limit, its voltage of determining that power unit provides powers to magnetron.
This method preferably also comprises step: whether the electric current of determining the input power of high-tension transformer can allow electric current above predetermined; Determine electric current when it and surpass the power supply of cutting off when being scheduled to allow electric current magnetron, and after magnetron is through the time-out of one section predetermined period of time, recover operation again magnetron.
Description of drawings
More fully understand the present invention and various purpose and advantage below in conjunction with accompanying drawing from following description, wherein
Fig. 1 is the controlling party block diagram according to microwave oven of the present invention;
Fig. 2 is the control flow chart according to high voltage of the present invention test section;
Fig. 3 is the control flow chart that expression flows into according to normal voltage of the present invention;
Fig. 4 is the detailed circuit diagram according to high voltage of the present invention test section;
Fig. 5 is the signal controlling party block diagram of conventional microwave oven.
Embodiment
Below with reference to the accompanying drawings the present invention is described in more detail.
Fig. 1 is the controlling party block diagram according to microwave oven of the present invention.As shown in the drawing, microwave oven comprises the power unit 1 that commercial ac power is provided to it, the commercial ac power that utilizes power unit 1 to provide produces high-tension high-tension transformer 7, the magnetron 9 that utilizes in the high-tension transformer 7 high voltage that produces to generate electromagnetic waves, whether the electric current of determining to be input to the input power of high-tension transformer 7 surpasses the predetermined current detecting part 13 that can allow electric current, and whether the supply voltage that definite power unit 1 provides surpasses the predetermined high voltage test section 14 that can allow upper voltage limit.
Also comprise when its supply voltage of determining that power unit 1 provides surpasses predetermined the cut-out to the power control section of magnetron 9 power supplies can allow upper voltage limit the time according to microwave oven of the present invention and to divide 11.Can constitute power control section divide 11 with box lunch its current value of determining to be input to high-tension transformer 7 surpasses predetermined can allow electric current the time, allow cut-out and time-out the load rejection preset time cycle, and after through predetermined time out, recover operation again magnetron to magnetron 9.
Also comprise according to microwave oven of the present invention commercial ac power is carried out rectification and level and smooth rectification/smooth 3, direct current by rectification/smooth 3 is converted to the inverter section 5 of high-frequency alternating current, the inverter control section 15 of control rectification/smooth 3 and inverter section 5, and the signal generating portion 27 that produces the control signal that is applied to inverter control section 15.Preferably, current detecting part 13 determines whether can allow electric current above predetermined by the galvanic electric current of rectification/smooth 3.To determine that galvanic electric currents have surpassed predetermined can allow electric current the time when current detecting part 13, preferably inverter control section 15 cuts off the input power that is input to magnetron 9 by inverter section 5, and make magnetron suspend the predetermined time out cycle that reaches, behind the process time out, recover operation then again magnetron.
Further describe the method for the controlled microwave stove according to the present invention below with reference to Fig. 2 and Fig. 3, Fig. 2 is the control flow chart according to high voltage of the present invention test section, and Fig. 3 is the control flow chart that expression flows into according to normal voltage of the present invention.
Commercial ac power is by power unit 1 input (S11).If imported commercial ac power, in high voltage test section 14, detect the voltage (S13) of institute's input AC electricity, be scheduled to allow upper voltage limit (S15) to determine whether detected voltage surpasses.Can allow upper voltage limit if determine detected voltage above predetermined, power control section is divided 11 power supplies of cutting off to magnetron 9 (S17).Can allow upper voltage limit above predetermined if determine detected voltage, 15 alternating currents by 3 pairs of inputs of rectification/smooth of inverter control section carry out rectification and level and smooth (S19).Next, inverter control section 15 relatively can allow electric current through the galvanic electric current of over commutation/smooth 3 conversions with predetermined, whether surpasses the latter (S21) to determine the former.If this electric current surpasses and predeterminedly can allow electric current, 15 of inverter control sections suspend in the cycle to magnetron 9 at predetermined time out imports electric energy (S23).If determine to have passed through the predetermined time out (S25) of magnetron 9,9 of magnetrons recover its operation (S27).Magnetron 9 time-out and recovery number of times in the given time counted (S29).Whether the suspending count of determining magnetron 9 surpasses pre-determined number (S31).Surpass pre-determined number if determine the suspending count of magnetron 9, interrupt being input to the electric energy (S33) of magnetron 9 so fully.
Can allow electric current if in step S21, determine galvanic electric current, recover power supply (S35) so inverter section 5 above predetermined.The power that offers inverter section 5 is offered high-tension transformer 7 produce high voltage (S37).The high voltage that high-tension transformer 7 is produced is applied to magnetron 9, thereby generates electromagnetic waves (S39).
As shown in Figure 3, signal generating portion 27 power that utilizes power unit 1 to provide generates control signal (S51) simultaneously.Signal that inverter control section 15 splitting signal generating portions 27 produce and the signal that will cut apart offer ON/OFF actuating section 23 and D/A part 25 (S53).Be applied to output control part 21 (S55) and control signal are applied to oscillating part 17 through output control part 21 input terminal (S57) at the fixed time at interval in inverter control section 15, cutting apart after-applied control signal to D/A part 25 and ON/OFF actuating section 23.Change the cycle of the control signal of passing through oscillating part 17 and offer inverter section 5 (S59).
Control signal through inverter section 5 is offered resonance test section 21 (S61).Inverter control section 15 is determined in the resonance test section 21 detected control signals whether unusual (S63).If determine that resonance test section 21 detected control signals are unusual, inverter control section 15 cuts off the control signal (S69) that is applied to output control part 19 so.
If determine that resonance test section 21 detected signals are no abnormal, 15 controls of inverter control section will be applied to the control signal of output control part 19 through inverter section 5 so.According to the control signal that is applied to inverter section 5, be converted into high-frequency alternating current through the direct current of over commutation/smooth 3.High-frequency alternating current after the conversion offers high-tension transformer 7, thereby produces high voltage, and the control signal through high-tension transformer 7 is offered magnetron 9 (S65).
Whether unusual for determining control signal through offering magnetron 9 behind the high-tension transformer 7, control signal can also be offered resonance test section 21.When the resonance frequency of the control signal of determining to offer resonance test section 21 surpasses predetermined resonant frequency, inverter control section 15 is controlled, with permission control signal is offered output control part 19, and repeat to the flow process (S57 to S63) of the control application of oscillating part 17 and inverter section 5.On the contrary, if control signal has surpassed predetermined resonant frequency, can interrupt so applying control signal to output control part 19.
Fig. 4 is the detailed circuit diagram according to high pressure of the present invention test section.As shown in the figure, high pressure test section 13 comprises and is used for relatively from the voltage of the commercial ac power of power unit 1 input and offers the comparator 31 of the starting resistor of high pressure test section 14.Comparator 31 is the voltage and the starting resistor of commercial ac power relatively.If the voltage of alternating current surpasses the allowed upper limit of starting resistor, power control section divides 11 controls to forbid the commercial ac power that provides from power unit 1 is offered magnetron 9.If the voltage of alternating current surpasses admissible upper voltage limit, the voltage of commercial ac power is offered magnetron 9.
As mentioned above; microwave oven according to the present invention comprises the power control section branch of cutting off the electricity supply when determining when the voltage that power unit provides surpasses predetermined allowed upper voltage limit; therefore; reduced the failure rate of circuit, and when the voltage of commercial ac power surpasses admissible upper voltage limit, can protect this circuit with stable manner.
As mentioned above,, provide a kind of microwave oven of the circuit abnormality that causes can avoid the voltage that provides at power unit to surpass admissible upper voltage limit the time according to the present invention, and control method.In addition, according to the present invention, can interrupt the abnormal current that the overcurrent by power supply causes, and solve the circuit unsteadiness that causes by abnormal current, thereby make circuit keep stable status.
Though disclose the preferred embodiments of the present invention for illustrative purposes, it will be understood by those skilled in the art that under the situation that does not break away from the disclosed scope and spirit of the present invention of claims, can the present invention is made various improvement, increase and replacement.
Claims (11)
1. a microwave oven has magnetron, and the alternating current that the power unit of alternating current is provided and utilizes power unit to provide produces high-tension high-tension transformer, comprising:
Predetermined can allow upper voltage limit the time when determining to surpass from the voltage that power unit provides, can interrupt the power control section branch of powering to magnetron.
2. microwave oven according to claim 1 is characterized in that comprising:
Alternating current is carried out rectification and level and smooth rectification/smooth;
Direct current through over commutation/smooth is converted to the inverter section of high-frequency alternating current; And
When surpassing predetermined allowed electric current, the galvanic electric current through over commutation/smooth interrupts inverter control section to the magnetron power supply.
3. microwave oven according to claim 2 is characterized in that comprising:
Relatively behind the power of inverter output and the power that provides from power unit, detect from the resonance test section of the abnormality of the power of inverter section output; And
Produce the signal generating portion of control signal,
Wherein determine in the resonance test section detected signal and occur when unusual that the inverter control section interrupts a control signal that generates from the signal generating portion is applied to inverter section when it.
4. microwave oven according to claim 1, it is characterized in that power control section divides the electric current of the input power of determining high-tension transformer whether to surpass predetermined allowed electric current, and when it determines that this electric current surpasses predetermined allowed electric current, interruption is powered to magnetron, and suspended predetermined time out week after date at magnetron, recover operation again to magnetron.
5. microwave oven according to claim 2, it is characterized in that power control section divides the electric current of the input power of determining high-tension transformer whether to surpass predetermined allowed electric current, and when it determines that this electric current surpasses predetermined allowed electric current, interruption is powered to magnetron, and suspended predetermined time out week after date at magnetron, recover operation again to magnetron.
6. microwave oven according to claim 1 is characterized in that further comprising whether the voltage that the power that provides from power unit is provided surpasses the high voltage test section of predetermined allowed upper voltage limit.
7. microwave oven according to claim 1 is characterized in that further comprising whether the voltage that the power that provides from power unit is provided surpasses the high voltage test section of predetermined allowed upper voltage limit.
8. microwave oven according to claim 6 is characterized in that the high voltage test section comprises the comparator of the voltage that provides from power unit and predetermined allowed upper voltage limit is provided relatively.
9. microwave oven according to claim 7 is characterized in that the high voltage test section comprises the comparator of the voltage that provides from power unit and predetermined allowed upper voltage limit is provided relatively.
10. the method for a controlled microwave stove, this microwave oven comprises magnetron, and the alternating current that the power unit of alternating current is provided and utilizes power unit to provide produces high-tension high-tension transformer, and it may further comprise the steps:
Determine whether the voltage that power unit provides surpasses predetermined allowed upper voltage limit; And
When surpassing predetermined allowed upper voltage limit, its voltage of determining that power unit provides interrupts power supply to magnetron.
11. method according to claim 10 is characterized in that also comprising following step:
Whether the electric current of determining the input power of high-tension transformer surpasses predetermined allowed electric current; And
When it determines that electric current has surpassed predetermined allowed electric current, interrupt power supply, and suspend the predetermined time out week after date of magnetron to magnetron, recover operation again to magnetron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021224765A CN1262150C (en) | 2002-06-05 | 2002-06-05 | Microwave oven and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021224765A CN1262150C (en) | 2002-06-05 | 2002-06-05 | Microwave oven and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1464765A true CN1464765A (en) | 2003-12-31 |
| CN1262150C CN1262150C (en) | 2006-06-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021224765A Expired - Fee Related CN1262150C (en) | 2002-06-05 | 2002-06-05 | Microwave oven and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1262150C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
| CN107831689A (en) * | 2017-10-31 | 2018-03-23 | 惠州鼎宝金属制品有限公司 | A kind of intelligence control system for oven |
-
2002
- 2002-06-05 CN CNB021224765A patent/CN1262150C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105578637A (en) * | 2015-12-29 | 2016-05-11 | 广东美的厨房电器制造有限公司 | Control method and device for microwave oven circuit and microwave oven |
| CN105578637B (en) * | 2015-12-29 | 2018-06-19 | 广东美的厨房电器制造有限公司 | Control method, control device and the micro-wave oven of microwave oven circuit |
| CN107831689A (en) * | 2017-10-31 | 2018-03-23 | 惠州鼎宝金属制品有限公司 | A kind of intelligence control system for oven |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1262150C (en) | 2006-06-28 |
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Granted publication date: 20060628 Termination date: 20160605 |