CN105744667B - The starting control device and method of micro-wave oven and micro-wave oven variable-frequency power sources - Google Patents
The starting control device and method of micro-wave oven and micro-wave oven variable-frequency power sources Download PDFInfo
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- CN105744667B CN105744667B CN201510428913.8A CN201510428913A CN105744667B CN 105744667 B CN105744667 B CN 105744667B CN 201510428913 A CN201510428913 A CN 201510428913A CN 105744667 B CN105744667 B CN 105744667B
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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
Abstract
The invention discloses a kind of starting control devices of micro-wave oven variable-frequency power sources, comprising: variable-frequency power sources；Resonance potential detection module, for detecting the resonance potential of transformer primary side；Control module enters the soft start stage for controlling variable-frequency power sources after variable-frequency power sources powers on, and control variable-frequency power sources enters warm-up phase after the soft start stage completes, wherein is controlled according to the resonance potential variable-frequency power sources in warm-up phase.The device can control variable-frequency power sources by detecting the resonance potential of transformer primary side, to realize accurately controlling to the anode voltage of magnetron.The invention also discloses a kind of micro-wave oven and a kind of starting control methods of micro-wave oven variable-frequency power sources.
Description
Technical field
The present invention relates to field of home appliance technology more particularly to a kind of starting control device of micro-wave oven variable-frequency power sources,
A kind of micro-wave oven and a kind of starting control method of micro-wave oven variable-frequency power sources.
Background technique
Currently, frequency-conversion microwave oven because have the advantages that fuselage light, low noise and power consumption it is low etc. due tos be widely used.
When frequency-conversion microwave oven operates normally, the filament of magnetron is heated to 2100K or so through 3.3V power supply and starts to emit
The electronics of electronics, transmitting makees wheel pendular motion under the action of anode high voltage and magnetic circuit, generates 2450MHz's in anode cavity
Microwave emits through energy follower into the heating cavity of micro-wave oven.
But when the variable-frequency power sources in frequency-conversion microwave oven just powers on, the filament of magnetron is in cold conditions, does not have transmitting
The ability of electronics, if filament is not fully warmed-up, and the anode voltage of magnetron is excessively high at this time, then will increase answering for magnetron
Power, so as to cause magnetron punch through damage.
In the related technology, MCU (Micro Controller Unit, micro-control are calculated by detection primary voltage of transformer
Unit processed) output maximum duty cycle, controlled with the anode voltage to magnetron.But since primary voltage of transformer exists
Fluctuation, so that duty ratio output inaccuracy, so that the anode voltage of magnetron can not be accurately controlled, may lead magnetron and hit
Damage or the damage of other devices are worn, but also may cause the problems such as starting speed is slow.
Therefore, how to accurately control the anode voltage of magnetron and whether the preheating of accurate judgement magnetron is completed, become one
A urgent problem to be solved.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.
For this purpose, passing through inspection an object of the present invention is to provide a kind of starting control device of micro-wave oven variable-frequency power sources
The resonance potential of transformer primary side is surveyed to accurately control variable-frequency power sources, to accurately control the anode voltage of magnetron.
Second object of the present invention is to propose a kind of micro-wave oven.
Third object of the present invention is to propose a kind of starting control method of micro-wave oven variable-frequency power sources.
To achieve the goals above, the starting control device of the micro-wave oven variable-frequency power sources of first aspect present invention embodiment,
It include: variable-frequency power sources；Resonance potential detection module, for detecting the resonance potential of transformer primary side；Control module, in institute
It states and controls the variable-frequency power sources after variable-frequency power sources powers on and enter the soft start stage, and controlled after the soft start stage completes
Make the variable-frequency power sources and enter warm-up phase, wherein in warm-up phase according to the resonance potential to the variable-frequency power sources into
Row control.
The starting control device of micro-wave oven variable-frequency power sources according to an embodiment of the present invention, is examined by resonance potential detection module
The resonance potential of transformer primary side is surveyed, for control module after variable-frequency power sources powers on, control variable-frequency power sources enters the soft start stage,
And after the soft start stage completes, control variable-frequency power sources enters warm-up phase, and according to resonance potential pair in warm-up phase
Variable-frequency power sources is controlled, to realize accurately controlling to the anode voltage of magnetron, both ensure that and has been opened under each operating voltage
The consistency of anode voltage, in turn ensures that anode voltage is in stable perfect condition, to ensure that the steady of magnetron when dynamic
Qualitative and reliability effectively prevents the damage of magnetron punch through damage or other devices that may cause because anode voltage is excessively high
It is bad, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, improve user experience.
In addition, the starting control device of above-mentioned micro-wave oven variable-frequency power sources can also have following additional skill according to the present invention
Art feature:
In one embodiment of the invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources, further includes: magnetic control
Tube anode current detection module, for detecting the anode current of magnetron, wherein the control module is according to the magnetron
Anode current judges whether the warm-up phase is completed, and controls the variable-frequency power sources after warm-up phase completion and enter
Normal operating phase.
In one embodiment of the invention, when the anode current of the magnetron is greater than preset threshold, described in judgement
Warm-up phase is completed.
In one embodiment of the invention, the anode of magnetron current detection module specifically includes: first resistor, institute
The one end for stating first resistor is connected with the anode of the magnetron；Second resistance, one end of the second resistance and described first
The other end of resistance is connected, the other end ground connection of the second resistance, wherein have between the first resistor and second resistance
First node；3rd resistor, one end of the 3rd resistor are connected with the first node, and the other end of the 3rd resistor is
The output end of the anode of magnetron current detection module.
In one embodiment of the invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources, further includes: upper
Machine, the host computer are connected with the anode of magnetron current detection module, and the host computer passes through communication line for the magnetic control
The anode current of pipe is sent to the control module.
In one embodiment of the invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources, further includes: connection
Optocoupler between the anode of magnetron current detection module and the control module, the anode of magnetron current detecting mould
The anode current of the magnetron is sent to the control module by the optocoupler by block.
In one embodiment of the invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources, further includes: primary side
Electric current/primary side power detection module, for detecting primary current/primary side power of the transformer, wherein the control module
Judge whether the warm-up phase is completed according to the primary current/primary side power, and is controlled after warm-up phase completion
It makes the variable-frequency power sources and enters normal operating phase.
To achieve the goals above, the micro-wave oven of second aspect of the present invention embodiment includes first aspect present invention embodiment
Micro-wave oven variable-frequency power sources starting control device.
Micro-wave oven according to an embodiment of the present invention, after variable-frequency power sources powers on, control variable-frequency power sources enters soft start rank
Section, and after the soft start stage completes, control variable-frequency power sources enters warm-up phase, and according to resonance potential in warm-up phase
Variable-frequency power sources is controlled, to realize accurately controlling to the anode voltage of magnetron, both ensure that under each operating voltage
The consistency of anode voltage when starting in turn ensures that anode voltage is in stable perfect condition, to ensure that magnetron
Stability and reliability effectively prevent the magnetron punch through damage that may cause because anode voltage is excessively high or other devices
Damage, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, improve user experience.In addition, passing through
Detect magnetron anode current or transformer primary current/primary side power can also accurate judgement magnetron warm-up phase
Whether complete.
To achieve the goals above, the starting control method of the micro-wave oven variable-frequency power sources of third aspect present invention embodiment,
It include: after variable-frequency power sources powers on, control variable-frequency power sources enters the soft start stage, and after the soft start stage completes, control
Variable-frequency power sources processed enters warm-up phase, wherein is controlled according to resonance potential variable-frequency power sources in warm-up phase.
The starting control method of micro-wave oven variable-frequency power sources according to an embodiment of the present invention, after variable-frequency power sources powers on, control
Variable-frequency power sources processed enters the soft start stage, and after the soft start stage completes, and control variable-frequency power sources enters warm-up phase, and
Variable-frequency power sources is controlled according to resonance potential in warm-up phase, to realize the accurate control to the anode voltage of magnetron
System both ensure that the consistency of anode voltage when starting under operating voltage, and in turn ensure that anode voltage was in stable ideal
State effectively prevents the magnetic control that may cause because anode voltage is excessively high to ensure that the stability and reliability of magnetron
The damage of pipe punch through damage or other devices, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, it mentions
High user experience.
In addition, the starting control method of above-mentioned micro-wave oven variable-frequency power sources can also have following additional skill according to the present invention
Art feature:
In one embodiment of the invention, the starting control method of above-mentioned micro-wave oven variable-frequency power sources, further includes: detection
The anode current of magnetron judges whether the warm-up phase is completed according to the anode current of the magnetron, and described pre-
The variable-frequency power sources, which is controlled, after hot stage completion enters normal operating phase.
In one embodiment of the invention, when the anode current of the magnetron is greater than preset threshold, described in judgement
Warm-up phase is completed.
In one embodiment of the invention, the starting control method of above-mentioned micro-wave oven variable-frequency power sources, further includes: detection
The primary current of the transformer/primary side power judges whether the warm-up phase is complete according to the primary current/primary side power
At, and control the variable-frequency power sources after warm-up phase completion and enter normal operating phase.
The advantages of additional aspect of the invention, will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the block diagram of the starting control device of micro-wave oven variable-frequency power sources according to an embodiment of the invention；
Fig. 2 is the box signal of the starting control device of micro-wave oven variable-frequency power sources in accordance with another embodiment of the present invention
Figure；
Fig. 3 is the circuit diagram of the starting control device of micro-wave oven variable-frequency power sources according to an embodiment of the invention；
Fig. 4 is the box signal of the starting control device of the micro-wave oven variable-frequency power sources of another embodiment according to the present invention
Figure；
Fig. 5 is the circuit diagram of the starting control device of micro-wave oven variable-frequency power sources in accordance with another embodiment of the present invention；
Fig. 6 is the flow chart of the starting control method of micro-wave oven variable-frequency power sources according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings the starting control device and method of micro-wave oven variable-frequency power sources according to an embodiment of the present invention are described
And micro-wave oven.
Fig. 1 is that the box of the starting control device of micro-wave oven variable-frequency power sources according to an embodiment of the invention is intended to.Such as
Shown in Fig. 1, the starting control device of the micro-wave oven variable-frequency power sources includes: resonance potential detection module 100,200 and of control module
Variable-frequency power sources 300.
Wherein, resonance potential detection module 100 is used to detect the resonance potential of transformer primary side.Control module 200 is used for
Variable-frequency power sources 300 is controlled after variable-frequency power sources 300 powers on and enters the soft start stage, and is controlled after the soft start stage completes
Variable-frequency power sources 300 enters warm-up phase, wherein is controlled according to resonance potential variable-frequency power sources 300 in warm-up phase.It needs
It is noted that the soft start stage can be demarcated according to the actual situation, for example, the soft start stage can be an alternating current week
Phase.
A specific example according to the present invention, in frequency-conversion microwave oven initial power-on, control module 200 controls variable-frequency electric
Source 300 enters the soft start stage, such as controls variable-frequency power sources 300 and is started to work with fixed frequency, also, in variable-frequency power sources 300
Switching tube duty ratio less than 10%, after the completion of the 300 soft start stage of variable-frequency power sources, control module 200 control variable-frequency electric
Source 300 enters warm-up phase, at this point, control module 200 is stepped up the duty ratio of switching tube, to improve the anode electricity of magnetron
Pressure, and obtain by resonance potential detection module 100 resonance potential of transformer primary side, when detection transformer primary side it is humorous
When vibration voltage reaches limit value, control module 200 maintains current duty cycle output.Also, in control module 200 according to currently accounting for
When sky is controlled than switch tube, if the resonance potential of the transformer primary side of detection is greater than limit value, control module 200
Reduce the duty ratio of switching tube；If the resonance potential of the transformer primary side of detection is less than limit value, control module 200 increases
The duty ratio of switching tube.It efficiently solves defeated brought by the maximum value for the duty ratio for calculating switching tube according to primary side supply voltage
Inaccurate problem effectively avoids to draw because anode voltage is excessively high to ensure that the stability and reliability of magnetron out
The damage of the magnetron punch through damage or other devices that rise, while effectively avoiding slow because starting speed caused by controlling inaccuracy
The problem of.
Wherein, as shown in Fig. 3 or Fig. 5, resonance potential detection module 100 may include the 4th resistance R4, the 5th resistance R5
With voltage comparator CMP, wherein one end of the 4th resistance R4 is connected with one end of transformer T armature winding, the 4th resistance R4's
The other end is connected with one end of the 5th resistance R5, and the other end of the 5th resistance R5 is grounded GND1, the other end of the 4th resistance R4 with
Between one end of 5th resistance R5 there is second node J2, second node J2 to be connected with the first input end of voltage comparator CMP,
Limit value Vref is connected with the second input terminal of voltage comparator CMP, the output end and control module 200 of voltage comparator CMP
It is connected, control module 200 accurately adjusts duty ratio according to the signal of voltage comparator CMP output end.
It is understood that limit value can also be preset in control module 200, control module 200 by with resonance
The resonance potential that voltage detection module 100 detects is compared, duty ratio to be adjusted.In addition, in implementation of the invention
In example, resonance potential detection module 100 also may include the combination of resistance perhaps capacitor or resistance and capacitor, certainly,
It can be by detecting the maximum value in resonance potential period to obtain resonance potential.
In one embodiment of the invention, as shown in Fig. 2, the starting control device of micro-wave oven variable-frequency power sources can also wrap
It includes: anode of magnetron current detection module 400.
Anode of magnetron current detection module 400 is used to detect the anode current of magnetron, wherein control module 200
Judge whether warm-up phase is completed according to the anode current of magnetron, and warm-up phase completion after control variable-frequency power sources 300 into
Enter normal operating phase.
In one embodiment of the invention, as shown in figure 3, anode of magnetron current detection module 400 is specific can include:
First resistor R1, second resistance R2 and 3rd resistor R3, wherein one end of first resistor R1 is connected with the anode of magnetron MGT,
One end of second resistance R2 is connected with the other end of first resistor R1, and the other end of second resistance R2 is grounded GND, wherein first
There is first node J1, one end of 3rd resistor R3 is connected with first node J1, third electricity between resistance R1 and second resistance R2
The other end for hindering R3 is the output end IB of anode of magnetron current detection module 400.
As shown in figure 3, a secondary windings of transformer T is connected to voltage-multiplying circuit, and the high pressure after multiplication of voltage, one end connection
To the anode of magnetron MGT, the other end is connected with one end of second resistance R2, is connected to magnetron after second resistance R2
MGT.When supply magnetron MGT anode voltage (- 4000V) through will form certain voltage drop when second resistance R2, the voltage
The size of drop is proportional to the size of current for flowing through anode of magnetron, and the voltage drop is sampled and can be obtained by 3rd resistor R3
Obtain the anode current of magnetron MGT.
In one embodiment of the invention, when the anode current of magnetron is greater than preset threshold, judge warm-up phase
It completes.Wherein, preset threshold can be demarcated according to the actual situation.
It is understood that the filament of magnetron is in cold conditions, and magnetron does not open due in magnetron initial power-on
Vibration, the anode current of magnetron is zero at this time, and after to the magnetron preheated one-section time, the anode current of magnetron gradually increases
Add, when the anode current of magnetron reaches preset threshold, judges that the warm-up phase of magnetron is completed.For example, shown in Fig. 3
In embodiment, when the corresponding voltage of the anode current of the magnetron of detection is greater than 0.3V, show anode of magnetron current detecting
The anode current for the magnetron that module 400 detects is greater than preset threshold, judges that warm-up phase is completed at this time.
In one embodiment of the invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources may also include upper
Machine, host computer are connected with anode of magnetron current detection module 400, and host computer is sent out the anode current of magnetron by communication line
It send to control module 200.
That is, will work as after the anode current that anode of magnetron current detection module 400 detects current magnetron
The anode current of preceding magnetron is sent to host computer, and the anode current of current magnetron is sent to control by communication line by host computer
Molding block 200 is judged by anode current of the control module 200 to current magnetron, to obtain the work at present of magnetron
State, and variable-frequency power sources is controlled according to the current working status of magnetron, magnetron is accurately controlled to realize,
The output power or control magnetron for such as reducing magnetron stop working.
It is understood that receiving the current magnetron of the transmission of anode of magnetron current detection module 400 in host computer
Anode current after, host computer can the anode current first to current magnetron judge, to obtain the current work of magnetron
Make state, and when needing magnetron to stop working, by control control module 200 so that magnetron stops working.
In another embodiment of the present invention, the starting control device of above-mentioned micro-wave oven variable-frequency power sources may also include that
The optocoupler being connected between anode of magnetron current detection module 400 and control module 200, anode of magnetron current detection module
The anode current of magnetron is sent to control module 200 by optocoupler by 400.
That is, passing through after the anode current that anode of magnetron current detection module 400 detects current magnetron
Optocoupler is sent to control module 200, and control module 200 is judged by the anode current to magnetron, to obtain magnetron
Current working status, and variable-frequency power sources is controlled according to the current working status of magnetron, to realize to magnetron
Accurately control, such as reduce magnetron output power or control magnetron stopping working.
In embodiments of the present invention, either host computer or optocoupler are all responsible for sending the anode current of magnetron
To control module 200, so as to control module 200 can the preheating of accurate judgement magnetron whether complete.
In an alternate embodiment of the present invention where, as shown in figure 4, the starting control device of micro-wave oven variable-frequency power sources may be used also
It include: primary current/primary side power detection module 500, primary current/primary side power detection module 500 is for detecting transformer
Primary current/primary side power, wherein control module 200 judges whether warm-up phase complete according to primary current/primary side power
At, and control variable-frequency power sources 300 enters normal operating phase after warm-up phase completion.
Specifically, as shown in Fig. 3 or Fig. 5, the primary current of transformer T, control module 200 are obtained by the 6th resistance R6
Judge whether magnetron warm-up phase is completed according to the primary current of the transformer T of detection.It is understood that can also lead to
The primary current for crossing the transformer T of detection carrys out the primary side power of calculating transformer T, so as to according to the primary side function of transformer T
Rate judges whether magnetron warm-up phase is completed.And after the completion of magnetron warm-up phase, control module 200 controls variable-frequency electric
Source 300 enters normal operating phase.
In an embodiment of the present invention, either anode of magnetron current detection module 400 or primary current/primary side function
Rate detection module 500, is all responsible for whether accurate judgement warm-up phase is completed, and avoids leading because judging that warm-up phase is completed too early
The magnetron of cause and the damage of other devices and because judge too late warm-up phase complete caused by start slow-footed problem.
The starting control device of micro-wave oven variable-frequency power sources according to an embodiment of the present invention, is examined by resonance potential detection module
The resonance potential of transformer primary side is surveyed, for control module after variable-frequency power sources powers on, control variable-frequency power sources enters the soft start stage,
And after the soft start stage completes, control variable-frequency power sources enters warm-up phase, and according to resonance potential pair in warm-up phase
Variable-frequency power sources is controlled, to realize accurately controlling to the anode voltage of magnetron, both ensure that and has been opened under each operating voltage
The consistency of anode voltage, in turn ensures that anode voltage is in stable perfect condition, to ensure that the steady of magnetron when dynamic
Qualitative and reliability effectively prevents the damage of magnetron punch through damage or other devices that may cause because anode voltage is excessively high
It is bad, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, improve user experience.
In order to realize above-described embodiment, the present invention also proposes a kind of micro-wave oven.
The micro-wave oven of the embodiment of the present invention includes the starting control of the micro-wave oven variable-frequency power sources of any of the above-described embodiment of the present invention
Device processed.
Micro-wave oven according to an embodiment of the present invention, after variable-frequency power sources powers on, control variable-frequency power sources enters soft start rank
Section, and after the soft start stage completes, control variable-frequency power sources enters warm-up phase, and according to resonance potential in warm-up phase
Variable-frequency power sources is controlled, to realize accurately controlling to the anode voltage of magnetron, both ensure that under each operating voltage
The consistency of anode voltage when starting in turn ensures that anode voltage is in stable perfect condition, to ensure that magnetron
Stability and reliability effectively prevent the magnetron punch through damage that may cause because anode voltage is excessively high or other devices
Damage, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, improve user experience.In addition, passing through
Detect magnetron anode current or transformer primary current/primary side power can also accurate judgement magnetron warm-up phase
Whether complete.
In order to realize above-described embodiment, the present invention also proposes a kind of starting control method of micro-wave oven variable-frequency power sources.
Fig. 6 is the flow chart of the starting control method of a micro-wave oven variable-frequency power sources according to the present invention.As shown in fig. 6, should
The starting control method of micro-wave oven variable-frequency power sources includes:
S101, after variable-frequency power sources powers on, control variable-frequency power sources enters the soft start stage.For example, in the soft start stage,
It can control variable-frequency power sources to start to work with fixed frequency, and control the duty ratio of switching tube in variable-frequency power sources less than 10%,
Wherein, the soft start stage can be an alternating current period.
S102, after the soft start stage completes, control variable-frequency power sources enters warm-up phase, wherein in warm-up phase
Variable-frequency power sources is controlled according to resonance potential.
A specific example according to the present invention, in frequency-conversion microwave oven initial power-on, control variable-frequency power sources enters soft open
The dynamic stage is such as controlled variable-frequency power sources and is started to work with fixed frequency, also, the duty ratio of the switching tube in variable-frequency power sources is less than
10%, after the completion of the variable-frequency power sources soft start stage, control variable-frequency power sources enters warm-up phase, at this point, being stepped up switching tube
Duty ratio, to improve the anode voltage of magnetron, and transformer primary side is obtained by the resonance potential of transformer primary side
Resonance potential maintains current duty cycle output when the resonance potential of the transformer primary side of detection reaches limit value.Also,
When being controlled according to current duty cycle switch tube, if the resonance potential of the transformer primary side of detection is greater than limit value,
Reduce the duty ratio of switching tube；If the resonance potential of the transformer primary side of detection is less than limit value, increase accounting for for switching tube
Empty ratio.Efficiently solve output inaccuracy brought by the maximum value for the duty ratio for calculating switching tube according to primary side supply voltage
Problem effectively avoids the magnetron that may cause because anode voltage is excessively high to ensure that the stability and reliability of magnetron
The damage of punch through damage or other devices, while effectively avoiding starting slow-footed problem caused by because of control inaccuracy.
Wherein, it as shown in Fig. 3 or Fig. 5, can be made up of the 4th resistance R4, the 5th resistance R5 and voltage comparator CMP
Resonance potential detection module resonance potential is detected, wherein one end of the 4th resistance R4 and transformer T armature winding
One end is connected, and the other end of the 4th resistance R4 is connected with one end of the 5th resistance R5, and the other end of the 5th resistance R5 is grounded GND1,
There is second node J2, second node J2 and voltage comparator between the other end of 4th resistance R4 and one end of the 5th resistance R5
The first input end of CMP is connected, and limit value Vref is connected with the second input terminal of voltage comparator CMP, voltage comparator CMP's
Output end is connected with control module, and control module accurately adjusts duty ratio according to the signal of voltage comparator CMP output end.
It is understood that limit value can also be preset in the control module, control module passes through the resonance with detection
Voltage is compared, duty ratio to be adjusted.In addition, in an embodiment of the present invention, resonance potential detection module can also
To include the combination of resistance perhaps capacitor or resistance and capacitor, it is of course also possible to most by the detection resonance potential period
Big value is to obtain resonance potential.
In one embodiment of the invention, the starting control method of above-mentioned micro-wave oven variable-frequency power sources may also include that inspection
The anode current for surveying magnetron, judges whether warm-up phase is completed according to the anode current of magnetron, and completes in warm-up phase
Control variable-frequency power sources enters normal operating phase later.
As shown in figure 3, can be by the anode of magnetron that is made of first resistor R1, second resistance R2 and 3rd resistor R3
Current detection module detects the anode current of magnetron, specifically, a secondary windings of transformer T is connected to a times piezoelectricity
Road, the high pressure after multiplication of voltage, one end are connected to the anode of magnetron MGT, and the other end is connected with one end of second resistance R2, through
Magnetron MGT is connected to after two resistance R2.The meeting when supplying the anode voltage (- 4000V) of magnetron MGT through second resistance R2
Certain voltage drop is formed, the size of the voltage drop is proportional to the size of current for flowing through anode of magnetron, passes through 3rd resistor R3
Carrying out sampling to the voltage drop can be obtained the anode current of magnetron MGT.
In one embodiment of the invention, when the anode current of magnetron is greater than preset threshold, judge warm-up phase
It completes.Wherein, preset threshold can be demarcated according to the actual situation.
It is understood that the filament of magnetron is in cold conditions, and magnetron does not open due in magnetron initial power-on
Vibration, the anode current of magnetron is zero at this time, and after to the magnetron preheated one-section time, the anode current of magnetron gradually increases
Add, when the anode current of magnetron reaches preset threshold, judges that the warm-up phase of magnetron is completed.For example, shown in Fig. 3
In embodiment, when the corresponding voltage of the anode current of the magnetron of detection is greater than 0.3V, show the anode of the magnetron of detection
Electric current is greater than preset threshold, judges that warm-up phase is completed at this time.
In one embodiment of the invention, the anode current of magnetron is fed back by host computer.
Specifically, the anode of current magnetron can be detected by anode of magnetron current detection module shown in Fig. 3
The anode current of current magnetron is sent to host computer, host computer after the anode current for detecting current magnetron by electric current
The anode current of current magnetron is sent to control module by communication line, by control module to the anode electricity of current magnetron
Stream judged, to obtain the current working status of magnetron, and according to the current working status of magnetron to variable-frequency power sources into
Row control, accurately controls magnetron to realize, the output power or control magnetron for such as reducing magnetron stop working.
It is understood that receiving the sun of the current magnetron of anode of magnetron current detection module transmission in host computer
After electrode current, host computer can the anode current first to current magnetron judge, to obtain the work at present shape of magnetron
State, and when needing magnetron to stop working, by control control module so that magnetron stops working.
In another embodiment of the present invention, pass through the anode current of opto-coupled feedback magnetron.
Specifically, passing through light after the anode current that anode of magnetron current detection module detects current magnetron
Coupling is sent to control module, and control module is judged by the anode current to magnetron, to obtain the current work of magnetron
Make state, and variable-frequency power sources is controlled according to the current working status of magnetron, to realize the accurate control to magnetron
System, the output power or control magnetron for such as reducing magnetron stop working.
In one embodiment of the invention, the starting control method of above-mentioned micro-wave oven variable-frequency power sources may also include that inspection
Primary current/primary side the power for surveying transformer, judges whether warm-up phase is completed according to primary current/primary side power, and pre-
Control variable-frequency power sources enters normal operating phase after the hot stage completes.Specifically, as shown in Fig. 3 or Fig. 5, pass through the 6th resistance
R6 obtains the primary current of transformer T, and control module judges that magnetron preheats rank according to the primary current of the transformer T of detection
Whether section is completed.It is understood that can also be by the primary current of the transformer T of detection come the primary side of calculating transformer T
Power, so as to judge whether magnetron warm-up phase is completed according to the primary side power of transformer T.And it is preheated in magnetron
After the completion of stage, control module control variable-frequency power sources enters normal operating phase.
In an embodiment of the present invention, either anode of magnetron current detection module or primary current/primary side power
Detection module, is all responsible for whether accurate judgement warm-up phase is completed, caused by avoiding because judging that warm-up phase is completed too early
The damage of magnetron and other devices and because judge too late warm-up phase complete caused by start slow-footed problem.
The starting control method of micro-wave oven variable-frequency power sources according to an embodiment of the present invention, after variable-frequency power sources powers on, control
Variable-frequency power sources processed enters the soft start stage, and after the soft start stage completes, and control variable-frequency power sources enters warm-up phase, and
Variable-frequency power sources is controlled according to resonance potential in warm-up phase, to realize the accurate control to the anode voltage of magnetron
System both ensure that the consistency of anode voltage when starting under operating voltage, and in turn ensure that anode voltage was in stable ideal
State effectively prevents the magnetic control that may cause because anode voltage is excessively high to ensure that the stability and reliability of magnetron
The damage of pipe punch through damage or other devices, and effectively avoid starting slow-footed problem caused by because of control inaccuracy, it mentions
High user experience.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system, including the system of processor or other can be held from instruction
The instruction fetch of row system, device or equipment and the system executed instruction) it uses, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium ", which can be, any may include, stores, communicates, propagates or pass
Defeated program is for instruction execution system, device or equipment or the dress used in conjunction with these instruction execution systems, device or equipment
It sets.The more specific example (non-exhaustive list) of computer-readable medium include the following: there is the electricity of one or more wirings
Interconnecting piece (electronic device), portable computer diskette box (magnetic device), random access memory (RAM), read-only memory
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium can even is that the paper that can print described program on it or other are suitable
Medium, because can then be edited, be interpreted or when necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..Although having been shown and retouching above
The embodiment of the present invention is stated, it is to be understood that above-described embodiment is exemplary, and should not be understood as to limit of the invention
System, those skilled in the art can be changed above-described embodiment, modify, replace and become within the scope of the invention
Type.
Claims (8)
1. a kind of starting control device of micro-wave oven variable-frequency power sources characterized by comprising
Variable-frequency power sources；
Resonance potential detection module, for detecting the resonance potential of transformer primary side；
Control module enters the soft start stage for controlling the variable-frequency power sources after the variable-frequency power sources powers on, and in institute
Stating the completion of soft start stage, controlling the variable-frequency power sources enters warm-up phase later, wherein according to described humorous in warm-up phase
Vibration voltage controls the variable-frequency power sources；
Further include:
Anode of magnetron current detection module, for detecting the anode current of magnetron, wherein the control module is according to
The anode current of magnetron judges whether the warm-up phase is completed, and controls the frequency conversion after warm-up phase completion
Power supply enters normal operating phase.
2. the starting control device of micro-wave oven variable-frequency power sources as described in claim 1, which is characterized in that when the magnetron
When anode current is greater than preset threshold, judge that the warm-up phase is completed.
3. the starting control device of micro-wave oven variable-frequency power sources as described in claim 1, which is characterized in that the anode of magnetron
Current detection module specifically includes:
First resistor, one end of the first resistor are connected with the anode of the magnetron；
Second resistance, one end of the second resistance are connected with the other end of the first resistor, the second resistance it is another
End ground connection, wherein there is first node between the first resistor and second resistance；
3rd resistor, one end of the 3rd resistor are connected with the first node, and the other end of the 3rd resistor is described
The output end of anode of magnetron current detection module.
4. the starting control device of micro-wave oven variable-frequency power sources as described in claim 1, which is characterized in that further include:
Host computer, the host computer are connected with the anode of magnetron current detection module, and the host computer will by communication line
The anode current of the magnetron is sent to the control module.
5. the starting control device of micro-wave oven variable-frequency power sources as described in claim 1, which is characterized in that further include:
The optocoupler being connected between the anode of magnetron current detection module and the control module, the anode of magnetron electricity
It flows detection module and the anode current of the magnetron is sent to by the control module by the optocoupler.
6. a kind of micro-wave oven, which is characterized in that the starting including micro-wave oven variable-frequency power sources as described in any one in claim 1-5
Control device.
7. a kind of starting control method of micro-wave oven variable-frequency power sources characterized by comprising
After variable-frequency power sources powers on, controls the variable-frequency power sources and enter the soft start stage；
After the soft start stage completes, controls the variable-frequency power sources and enter warm-up phase, wherein the root in warm-up phase
The variable-frequency power sources is controlled according to the resonance potential of transformer primary side；
Further include:
Detect the anode current of magnetron；
Judge whether the warm-up phase is completed according to the anode current of the magnetron, and after warm-up phase completion
It controls the variable-frequency power sources and enters normal operating phase.
8. the starting control method of micro-wave oven variable-frequency power sources as claimed in claim 7, which is characterized in that when the magnetron
When anode current is greater than preset threshold, judge that the warm-up phase is completed.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510428913.8A CN105744667B (en) | 2015-07-20 | 2015-07-20 | The starting control device and method of micro-wave oven and micro-wave oven variable-frequency power sources |
| PCT/CN2016/073925 WO2017012338A1 (en) | 2015-07-20 | 2016-02-17 | Microwave oven, and starting control device and method for variable-frequency power supply of microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510428913.8A CN105744667B (en) | 2015-07-20 | 2015-07-20 | The starting control device and method of micro-wave oven and micro-wave oven variable-frequency power sources |
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| CN105744667A CN105744667A (en) | 2016-07-06 |
| CN105744667B true CN105744667B (en) | 2019-07-02 |
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| CN107896393B (en) | 2017-10-30 | 2020-01-03 | 深圳麦格米特电气股份有限公司 | Magnetron temperature adjusting method, device and system, variable frequency power supply and microwave equipment |
| CN108900099B (en) * | 2018-07-03 | 2020-01-03 | 加码技术有限公司 | Microwave frequency conversion circuit and control method thereof |
| CN113068283B (en) * | 2021-04-30 | 2023-02-17 | 广东美的厨房电器制造有限公司 | Microwave heating system, microwave electric appliance, control method and storage medium |
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| EP1916877A1 (en) * | 2006-10-25 | 2008-04-30 | Sidel Participations | Method and device for adjusting the electrical power supply of a magnetron, and installation for treatment of thermoplastic containers applying same |
| CN102332812A (en) * | 2011-09-17 | 2012-01-25 | 深圳麦格米特电气股份有限公司 | Self-adaptive starting method for power supply of variable frequency microwave oven |
| CN102647818A (en) * | 2012-01-13 | 2012-08-22 | 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 |
| CN103716931A (en) * | 2012-10-05 | 2014-04-09 | 松下电器产业株式会社 | Power control apparatus for high-frequency dielectric heating |
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| EP1916877A1 (en) * | 2006-10-25 | 2008-04-30 | Sidel Participations | Method and device for adjusting the electrical power supply of a magnetron, and installation for treatment of thermoplastic containers applying same |
| CN102332812A (en) * | 2011-09-17 | 2012-01-25 | 深圳麦格米特电气股份有限公司 | Self-adaptive starting method for power supply of variable frequency microwave oven |
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