CN101336016B - Micro-wave oven soft starting method and starting apparatus - Google Patents
Micro-wave oven soft starting method and starting apparatus Download PDFInfo
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- CN101336016B CN101336016B CN2008101427808A CN200810142780A CN101336016B CN 101336016 B CN101336016 B CN 101336016B CN 2008101427808 A CN2008101427808 A CN 2008101427808A CN 200810142780 A CN200810142780 A CN 200810142780A CN 101336016 B CN101336016 B CN 101336016B
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Abstract
The invention discloses a starting device of a microwave oven. An ouput end of a magnetron of the microwave oven is connected to a base electrode of a triode TR9 through a first resistance R7. A collector of the triode TR9 is connected to a gate electrode of a silicon controlled rectifier SCR1 through a second resistance R51 and is connected to a power supply through a pull-up resistance. The positive and negative electrodes of the SCR1 are respectively connected to both ends of a load. The device also comprises: a magnetron starting unit to start the work of the SCR1 and to be set as a low level through the output end of the magnetron; a timing unit to start a timer after a voltage signal output from the magnetron reaches zero-crossing point, and to set a timing interrupted time according to the pulse width of the voltage; a load starting unit to set the magnetron output end as a high level at the timing interrupted time of the timer, and to start the load. The invention also provides a soft starting method the microwave oven. The invention can effectively reduce starting current of the microwave oven, which is simple and practical, low in cost.
Description
Technical field
The present invention relates to the microwave oven start-up technique, relate in particular to a kind of microwave oven soft-start method and starting drive.
Background technology
As everyone knows, microwave oven is the microwave that utilizes magnetron to produce applies microwave action to load a equipment.Because the microwave oven load is an inductive load, in the moment that the magnetron of microwave oven starts, can be to the load voltage of exerting pressure, and in control circuit, produce very big electric current, up to 60-70A, when can having a significant impact the life-span of magnetron and open, so big electric current, can produce very big sound because electric current is very big.
In the prior art, the control method of microwave oven magnetic is mainly contained two kinds, i.e. relay control and SCR control., generally be in hardware circuit, to increase a thermistor that is connected in parallel on the positive temperature coefficient at magnetron two ends wherein, when magnetron is opened, utilize the current time characteristic of described semistor, suppress the big electric current that produces in the circuit for the former.The shortcoming of this method is owing to increased thermistor, causes the hardware circuit more complicated and has improved cost.
Summary of the invention
Technical problem to be solved by this invention is: a kind of microwave oven soft-start method is provided, and firing current, simple possible and cost that this method can effectively reduce microwave oven are low.
Technical problem to be solved by this invention is: a kind of microwave oven soft starting device is provided, and firing current, simple possible and cost that this device can effectively reduce microwave oven are low.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of microwave oven starting drive, the output of the magnetron of microwave oven is connected to the base stage of triode TR9 by first resistance R 7, the collector electrode of triode TR9 is connected to the gate pole of controllable silicon SCR 1 and connects power supply by pull-up resistor by second resistance R 51, the both positive and negative polarity of controllable silicon SCR 1 then connects the two ends of load respectively, and this device also includes:
The magnetron start unit is used to start magnetron work, and is changed to low level through the output of described magnetron;
Timing unit is used for starting a timer after the magnetron output voltage signal reaches zero crossing, and according to the pulse duration of described voltage is set regularly break period;
The load start unit is used for the magnetron output being changed to high level, starting load at the timing point of interruption of timer.
Correspondingly, the present invention also adopts following technical scheme: a kind of microwave oven soft-start method, be used for controlling circuit of microwave oven with the output of SCR control microwave magnetron, and may further comprise the steps:
When starting magnetron work, putting its output is low level;
After detecting the magnetron output voltage signal and reaching zero crossing, start a timer, and be set regularly break period according to the pulse duration of described voltage;
The timing point of interruption at timer is changed to high level with the magnetron output, starting load.
The invention has the beneficial effects as follows: embodiments of the invention are by the control silicon controlled angle of flow in the SCR control circuit, thereby the firing current, simple possible and the cost that have reduced microwave oven effectively are low.
The present invention is described in further detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the hardware circuit diagram of an embodiment of microwave oven soft-start method provided by the invention.
Fig. 2 is the signal schematic representation of an embodiment of microwave oven soft-start method provided by the invention.
Fig. 3 is the method flow diagram of an embodiment of microwave oven soft-start method provided by the invention.
Fig. 4 is the composition structure chart of an embodiment of microwave oven starting drive provided by the invention.
Embodiment
With reference to figure 1, this figure is the hardware circuit diagram of an embodiment of microwave oven soft-start method provided by the invention; As shown in the figure, the collector electrode that the output of magnetron Mag is connected to base stage, the TR9 of triode TR9 by resistance R 7 is connected to the gate pole of controllable silicon SR1 by resistance R 51 and connects+the 5V power supply by pull-up resistor, and the both positive and negative polarity of SR1 then connects the two ends of load respectively.
With reference to figure 2, because in perceptual load circuit, voltage 1 differs 90 ° with the maximum of electric current 2 on phase place, i.e. the peak of voltage, the just smallest point of electric current.Based on above-mentioned principle, can monitor its voltage zero-crossing signal 3 by Single-chip Controlling, the regular hour is opened load after the voltage over zero in circuit, on this load opening point 4, can not produce very big stream in the circuit.
With reference to figure 3, during specific implementation, the method flow of a microwave oven soft start is as follows:
In step S01, when starting magnetron mag work, putting its output by the Single-chip Controlling (not shown) is low level, and at this moment, triode TR9 ends, controllable silicon SCR 1 is ended.
In step S02, detect the magnetron output voltage signal and whether reach zero crossing, if detect described zero crossing (as the rising edge of zero cross signal among Fig. 2), execution in step S03 then, otherwise, continue to detect.
In step S03, start a timer, the timing that 5-6MS is set is interrupted, and during specific implementation, regularly break period can be according to the pulse duration setting of described voltage.
In step S04, at the timing point of interruption of timer the magnetron output is changed to high level, triode TR9 conducting this moment, controllable silicon SCR 1 first anode and gate pole have forward current, controllable silicon conducting, load startup.
Describe an embodiment of microwave oven starting drive provided by the invention in detail below with reference to Fig. 4; As shown in the figure, present embodiment mainly includes:
During specific implementation, described timing is generally the 5-6 millisecond break period.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (4)
1. microwave oven starting drive, it is characterized in that, the output of the magnetron of microwave oven is connected to the base stage of triode TR9 by first resistance R 7, the collector electrode of triode TR9 is connected to the gate pole of controllable silicon SCR 1 and connects power supply by pull-up resistor by second resistance R 51, the both positive and negative polarity of controllable silicon SCR 1 then connects the two ends of load respectively, and this device also includes:
The magnetron start unit is used to start magnetron work, and is changed to low level through the output of described magnetron;
Timing unit is used for starting a timer after the magnetron output voltage signal reaches zero crossing, and according to the pulse duration of described voltage is set regularly break period;
The load start unit is used for the magnetron output being changed to high level, starting load at the timing point of interruption of timer.
2. microwave oven starting drive as claimed in claim 1 is characterized in that, described timing break period is 5～6 milliseconds.
3. microwave oven soft-start method that adopts microwave oven starting drive as claimed in claim 1 or 2 may further comprise the steps:
When starting magnetron work, putting its output is low level;
After detecting the magnetron output voltage signal and reaching zero crossing, start a timer, and be set regularly break period according to the pulse duration of described voltage;
The timing point of interruption at timer is changed to high level with the magnetron output, starting load.
4. microwave oven soft-start method as claimed in claim 3 is characterized in that, described timing break period is 5～6 milliseconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101427808A CN101336016B (en) | 2008-08-04 | 2008-08-04 | Micro-wave oven soft starting method and starting apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101427808A CN101336016B (en) | 2008-08-04 | 2008-08-04 | Micro-wave oven soft starting method and starting apparatus |
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| CN101336016A CN101336016A (en) | 2008-12-31 |
| CN101336016B true CN101336016B (en) | 2011-03-30 |
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| CN2008101427808A Expired - Fee Related CN101336016B (en) | 2008-08-04 | 2008-08-04 | Micro-wave oven soft starting method and starting apparatus |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313307B (en) * | 2011-09-13 | 2014-07-09 | 深圳麦格米特电气股份有限公司 | Method of switching power for variable frequency microwave oven |
| CN102404892B (en) * | 2011-10-10 | 2014-06-04 | 深圳麦格米特电气股份有限公司 | Power supply soft start method of variable-frequency microwave oven |
| CN102647818B (en) * | 2012-01-13 | 2014-01-29 | 深圳麦格米特电气股份有限公司 | Starting method for variable-frequency power source of microwave oven and variable-frequency power circuit of microwave oven |
| CN104362922B (en) * | 2014-11-25 | 2018-01-30 | 广东美的厨房电器制造有限公司 | The control device and control method of transformer in micro-wave 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 |
| CN105517219B (en) * | 2015-12-29 | 2018-09-04 | 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 |
| CN111225463B (en) * | 2020-01-18 | 2022-04-05 | 九阳股份有限公司 | Power control method for electromagnetic cooking appliance, electromagnetic cooking appliance and medium |
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