CN104362922B - The control device and control method of transformer in micro-wave oven - Google Patents
The control device and control method of transformer in micro-wave oven Download PDFInfo
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- CN104362922B CN104362922B CN201410690957.3A CN201410690957A CN104362922B CN 104362922 B CN104362922 B CN 104362922B CN 201410690957 A CN201410690957 A CN 201410690957A CN 104362922 B CN104362922 B CN 104362922B
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Abstract
The invention discloses a kind of control device of transformer in micro-wave oven, including：Fire door detection module, for exporting door open command when the fire door of micro-wave oven is according to the instruction unpack of user；Zero passage detection module, for being detected input civil power to export zero cross signal；Transformer；Drive module, start for driving transformer or close；The control module being connected respectively with fire door detection module, zero passage detection module and drive module, control module is used to receive door open command, the current flow of transformer is detected according to door open command, and transformer is controlled to close, and for receiving enabled instruction, and the zero cross signal of input civil power is detected, opening point and closing point according to corresponding to obtaining current flow, and started according to zero cross signal and corresponding opening point and closing point control transformer.The control device can avoid excitation surge current excessive in the case of unexpected enabling causes closing point uncontrollable.The invention also discloses a kind of control method of transformer in micro-wave oven.
Description
Technical field
The present invention relates to kitchen appliance technical field, the control device and one kind of transformer in more particularly to a kind of micro-wave oven
The control method of transformer in micro-wave oven.
Background technology
Transformer idle-loaded switching-on put into power network when, due to transformer core magnetic flux saturation and core material it is non-linear
Characteristic, the sizable excitation surge current of amplitude can be produced, thus malfunction for tranformer protection may be caused to make, while transformation may be caused
Device winding deformation, reduce the life-span of transformer.Wherein, excitation surge current is the dash current caused by iron core magnetic flux saturation, and its is big
It is small related to transformer equivalent impedance, combined floodgate initial phase angle, remanent magnetism size, winding connection mode, core structure and material etc..
But because transformer equivalent impedance, winding connection mode, core structure and material have just been determined when dispatching from the factory
It is fixed, it can not change, the following two modes of correlation technique generally use suppress excitation surge current：
One is by selecting specific phase to open and close transformer, i.e., by selecting optimal opening point and pass
Close point, the magnetic flux in magnetic core is not undergone mutation in idle-loaded switching-on, avoid the saturation of core flux, so as to reach suppression excitation
The purpose shoved.But it has the drawback that, opening the door will cause closing point uncontrollable suddenly, close the uncontrollable feelings of point
May caused higher excitation surge current under condition.
The second is by closing circuit in parallel suitable a resistance and switching circuitry, being gushed so as to reach suppression excitation
The purpose of stream.But it has the drawback that, control sequential is complicated, adds resistance and relay, that is, adds cost.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose in a kind of control device of the transformer in micro-wave oven is proposed, can avoid closing caused by the uncontrollable situation of point compared with
High excitation surge current.
It is another object of the present invention to the control method for proposing transformer in a kind of micro-wave oven.
The control device of transformer in the micro-wave oven that embodiment proposes according to an aspect of the present invention, including：Fire door detects mould
Block, for exporting door open command when the fire door of the micro-wave oven is according to the instruction unpack of user；Zero passage detection module, for pair
Input civil power is detected to export zero cross signal；Transformer；Drive module, the drive module are used to drive the transformer
Start or close；Control module, the control module respectively with the fire door detection module, the zero passage detection module and described
Drive module is connected, and the control module is used to receive the door open command, and detects the transformation according to the door open command
The current flow of device, and control the transformer to close, and for receiving enabled instruction, and detect the mistake of the input civil power
Zero-signal, and opening point and point is closed according to corresponding to obtaining the current flow, and according to the zero cross signal and described right
The opening point and closing point answered control the transformer to be started.
The control device of transformer in micro-wave oven according to embodiments of the present invention, control module receive door open command it
Afterwards, the current flow of transformer is detected according to door open command, and controls transformer to close, afterwards, control module opens in reception again
After moving instruction, the zero cross signal of detection input civil power, and opening point and closing point according to corresponding to obtaining current flow, and root
Started according to zero cross signal and corresponding opening point and a closing point control transformer.Thus, the control device opens the door suddenly
In the case of causing closing point uncontrollable, excitation surge current can be avoided excessive, avoid core flux saturation and transformer life
Reduce.
According to one embodiment of present invention, when the current flow be on the occasion of when, control module selection negative sense is opened
Open a little and negative sense closes point；When the current flow is negative value, the control module selects positive opening point and positive closing
Point.
According to the specific embodiment of the present invention, the zero passage detection module includes：Photoelectrical coupler, the photoelectricity coupling
The first input end of clutch is connected with the live wire of the civil power, the second input of the photoelectrical coupler and the zero of the civil power
Line is connected, the first output head grounding of the photoelectrical coupler；First resistor, one end of the first resistor and the photoelectricity coupling
Second output end of clutch is connected, and the other end of the first resistor is connected for output end with the control module.
Further, the zero passage detection module also includes：First electric capacity, one end of first electric capacity and described first
The other end of resistance is connected, the other end ground connection of first electric capacity.
Further, the zero passage detection module also includes：Second resistance, the second resistance are connected to the photoelectricity
Between the live wire of the first input end of coupler and the civil power.
Further, the zero passage detection module also includes：3rd resistor, one end of the 3rd resistor and the light
Second output end of electric coupler is connected, and the other end of the 3rd resistor is connected with default power supply.
Further, the photoelectrical coupler specifically includes：Light emitting diode, the anode of the light emitting diode is institute
The first input end of photoelectrical coupler is stated, the negative electrode of the light emitting diode is the second input of the photoelectrical coupler；Light
Quick triode, the first output end of the extremely described photoelectrical coupler of transmitting of the phototriode, the phototriode
Second output end of the extremely described photoelectrical coupler of current collection.
The control method of transformer, comprises the following steps in the micro-wave oven that embodiment proposes according to a further aspect of the invention：
Receive door open command；The current flow of transformer is detected according to the door open command, and controls the transformer to close；Reception is opened
Dynamic instruction, and detect the zero cross signal of input civil power；Opening point and closing point according to corresponding to obtaining the current flow, and root
The transformer is controlled to be started according to the zero cross signal and the corresponding opening point and closing point.
The control method of transformer in micro-wave oven according to embodiments of the present invention, after door open command is received, according to opening
The current flow of door command detection transformer, and control transformer to close, and then after enabled instruction is received, detection is defeated
Enter the zero cross signal of civil power, and opening point and closing point according to corresponding to obtaining current flow, and according to zero cross signal and correspondingly
Opening point and close point a control transformer started.Thus, the control method causes closing point uncontrollable in unexpected enabling
In the case of, excitation surge current can be avoided excessive, avoid core flux saturation and transformer life from reducing
According to one embodiment of present invention, the opening point according to corresponding to obtaining the current flow and closing point tool
Body includes：When the current flow be on the occasion of when, select negative sense opening point and negative sense to close point；When the current flow is negative value
When, select positive opening point and positive closing point.
Brief description of the drawings
Fig. 1 is the block diagram of the control device of transformer in micro-wave oven according to embodiments of the present invention；
Fig. 2 is the waveform diagram according to an embodiment of the invention for inputting civil power, transformer current and zero cross signal；
Fig. 3 is the hysteresis curve of ferromagnetic material according to an embodiment of the invention；
Fig. 4 is zero passage detection module in the control device of transformer in the micro-wave oven according to a specific embodiment of the invention
Circuit theory diagrams；And
Fig. 5 is the flow chart of the control method of transformer in micro-wave oven according to embodiments of the present invention.
Reference：
Fire door detection module 1, zero passage detection module 2, transformer 3, drive module 4, control module 5, photoelectrical coupler
201st, light emitting diode D, phototriode Q, first resistor R1, the first electric capacity C1, second resistance R2 and 3rd resistor R3.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
It is simple first below in the micro-wave oven of the description embodiment of the present invention before the control device of transformer and control method
Singly introduce correlation technique using suppress excitation surge current by the way of.
Itd is proposed in correlation technique can a kind of method, this method opens by selecting fixed opening point and closing point come corresponding to
Dynamic and closing transformer.Specifically, it can start corresponding to by way of " just opening positive pass, bearing and open negative pass " and close transformer,
Wherein, just opening positive close is exactly, in fixed positive opening point starting transformer, accordingly, it is necessary in fixed positive closing point
Close transformer；It is negative to open negative pass and be exactly, in fixed negative sense opening point starting transformer, accordingly, it is necessary in fixed negative sense
Close point closing transformer.
Thus, when fire door is thrown open, because the chain response speed of door is faster than the control speed of control module, transformation
Device is forced to close in random point, and control module closes transformer in fixed closing point.According to Fig. 3 example, if transformation
Device be forced closed after by remanent magnetism Br, and just in positive opening point starting transformer when restarting transformer, then, magnetic strength
Intensity B is answered to change according to the curve Br-A of Br to A in Fig. 3, i.e. magnetic induction density B saturation, magnetic field intensity H (i.e. excitation electricity
Stream I) gradually increase and be up to a higher value Hinrush in A points, so as to cause magnetic core saturation, exciting current excessive even
It is exceeded.
Based on this, the present invention proposes the control device and control method of transformer in a kind of micro-wave oven.
Below with reference to the accompanying drawings the control device and control method of transformer in the micro-wave oven of the embodiment of the present invention are described.
Fig. 1 is the block diagram of the control device of transformer in micro-wave oven according to embodiments of the present invention.Such as Fig. 1 institutes
Show, the control device of transformer includes in the micro-wave oven：Fire door detection module 1, zero passage detection module 2, transformer 3, driving mould
Block 4 and control module 5.
Wherein, fire door detection module 1 is used to export door open command when the fire door of micro-wave oven is according to the instruction unpack of user；
Zero passage detection module 2 is used to detect to export zero cross signal input civil power, and specifically, zero cross signal can be such as Fig. 2 medium waves
Shown in shape 1, when the instantaneous voltage for inputting civil power is less than predetermined threshold value, zero passage detection module 2 exports the zero cross signal of high level；
When the instantaneous voltage for inputting civil power is more than predetermined threshold value, zero passage detection module 2 exports low level zero cross signal, wherein, in advance
If threshold value can be 0.
Drive module 4 starts or closed for driving transformer 3, and specifically, transformer can be Industrial Frequency Transformer；Control mould
Block 5 is connected with fire door detection module 1, zero passage detection module 2 and drive module 4 respectively, and control module 5 refers to for receiving enabling
Order, and according to the current flow of door open command detection transformer 3, and control transformer 3 to close, i.e., controlled by drive module 4
Transformer 3 is closed, and for receiving enabled instruction, and the zero cross signal of input civil power is detected, and obtained according to current flow
Corresponding opening point and closing point, and started according to zero cross signal and corresponding opening point and a closing point control transformer 3,
Transformer 3 is controlled to start by drive module 4.
That is, when fire door is thrown open, control module 5 detects oven door opening by fire door detection module 1, this
When, control module 5 judges the period position of the current flow of transformer 3 when transformer 3 is stopped, that is, judges transformer 3
Current flow is that afterwards, control module 5 detects by fire door detection module positioned at negative half-cycle or positioned at positive half period
When fire door closes and receives the enabled instruction that user is inputted by control panel, i.e., in starting transformer 3 next time, according to
The period position of current flow obtain corresponding to opening point, and according to corresponding to determining zero cross signal opening point to be opened corresponding
Open a control transformer 3 to start, point control is closed if micro-wave oven normal switching-off, corresponding to the period position in current flow
Micro-wave oven is closed, so as to avoid closing point higher excitation surge current caused by uncontrollable situation.
Thus, in micro-wave oven according to embodiments of the present invention transformer control device, cause to close point in unexpected enabling
In the case of uncontrollable, excitation surge current can be avoided excessive, avoid core flux saturation and transformer life from reducing.
According to one embodiment of present invention, opening point may include that positive opening point and negative opening point, closing point may include just
Close point and it is negative close point, when current flow be on the occasion of when, control module 5 selects negative sense opening point and negative sense to close point；When work as
When preceding electric current is negative value, control module 5 selects positive opening point and positive closing point.Wherein it is possible to understand, forward direction is opened
Point and positive closing point can be corresponding with two phases of the positive half period of line voltage (i.e. transformer voltage), and negative sense opening point
Closing point with negative sense can be corresponding with two phases of the negative half-cycle in line voltage.Such as Fig. 2 example, positive opening point and just
To close point and negative sense opening point and negative sense close point can respectively with phase 1, the phase to be marked in Fig. 2 on line voltage waveform
Position 2, phase 3 and the correspondence of phase 4.
Specifically, when a door is opened, if control module 5 judges the current flow of transformer 3 for negative value, next time is heavy
During new starting transformer 3, control module 5 must control transformer 3 to be started in positive opening point.More specifically, such as Fig. 2 and
Fig. 3 example, when the current flow of transformer 3 is negative value, the current flow of transformer 3 is between Fig. 2 midpoints D to point E,
Correspondingly, the winding of transformer 3 produces magnetic field intensity H (i.e. exciting current I) and be in Fig. 3 reference axis left side, i.e., arrive in 0-
Between Hm.Afterwards, transformer 3 starts afterflow after oven door opening, also, E points in fig. 2 are stopped afterflow by transformer 3,
That is-Br the places in Fig. 3 stop afterflow, and thus, transformer 3 has remanent magnetism-Br.During restarting transformer 3 next time, it is necessary to just
Started to opening point control transformer 3, for example, control module 5 is examined by zero passage detection module 2 to line voltage
Survey, when zero cross signal saltus step is low level, controllable timer starts timing, and it is pre- to reach first in the timing time of timer
If reaching positive opening point during the time, line voltage reaches phase 1, and control module 5 controls transformer 3 to be started, so as to become
Forward current is produced in the winding of depressor 3 and offsets remanent magnetism, reduces excitation surge current；Otherwise, if controlling transformation in negative sense opening point
Device 3 is started, the magnetic core of transformer 3 will saturation quickly, cause exciting current very big exceeded.
On the contrary, when a door is opened, if control module 5 judges the current flow of transformer 3 on the occasion of next time is heavy
During new starting transformer 3, control module 5 must control transformer 3 to be started in negative sense opening point.More specifically, such as Fig. 2 and
Fig. 3 example, when the current flow of transformer 3 is negative value, the current flow of transformer 3 is in Fig. 2 between C to point D, phase
Ying Di, the winding of transformer 3 produce magnetic field intensity H and are in Fig. 3 on the right side of reference axis, i.e., between 0~Hm.Afterwards, transformation
Device 3 starts afterflow after oven door opening, also, transformer 3 stops D points in fig. 2 at the Br in afterflow, namely Fig. 3 to stop
Remanent magnetism Br be present in only afterflow, thus, transformer 3.During restarting transformer 3 next time, it is necessary to control transformation in negative sense opening point
Device 3 is started, for example, control module 5 is detected by zero passage detection module 2 to line voltage, in zero cross signal by low
When level saltus step is high level, controllable timer starts timing, when the timing time of timer reaches three preset times
Reach negative sense opening point, line voltage reaches phase 3, and control module 5 controls transformer 3 to be started, so as to transformer 3 around
Negative current is produced in group and offsets remanent magnetism, reduces excitation surge current；Otherwise, if opened in positive opening point control transformer 3
It is dynamic, the magnetic core of transformer 3 will saturation quickly, cause exciting current very big exceeded.
In addition, if micro-wave oven normal switching-off, then close point control corresponding to 5 period position in current flow of control module
Micro-wave oven processed is closed.That is, when when current flow be on the occasion of when, control module 5 select negative sense close point, that is, say, control
Module 5 is detected by zero passage detection module 2 to line voltage, can when it is high level that zero cross signal is by low transition
Control timer starts timing, reaches positive when the timing time of timer reaches the second preset time and closes point, civil power electricity
Pressure reaches phase 2, and control module 5 controls transformer 3 to close.When current flow is negative value, control module 5 selects positive pass
Close point, that is, say, control module 5 is detected by zero passage detection module 2 to line voltage, in zero cross signal by high level saltus step
For low level when, controllable timer starts timing, reaches positive when the timing time of timer reaches four preset times
Point is closed, line voltage reaches phase 4, and control module 5 controls transformer 3 to close.
The circuit theory of the zero passage detection module 2 of the embodiment of the present invention is described in detail with reference to Fig. 4.
Specifically, as Fig. 4 example, zero passage detection module 2 include：Photoelectrical coupler 201 and first resistor R1.
Wherein, the first input end of photoelectrical coupler 201 is connected with the live wire L of civil power, and the second of photoelectrical coupler 201 is defeated
Enter end with the zero line N of civil power to be connected, the first output head grounding GND of photoelectrical coupler 201, photoelectrical coupler 201 can be realized by force
The isolation of electricity and light current；First resistor R1 one end is connected with the second output end of photoelectrical coupler 201, and first resistor R1's is another
One end is that output end ZERO is connected with control module 5 to export zero cross signal to control module 5, and first resistor R1 is defeated for carrying out
Go out current limliting.
More specifically, photoelectrical coupler 201 specifically includes：Light emitting diode D and phototriode Q.Light emitting diode D's
Anode is the first input end of photoelectrical coupler 201, and light emitting diode D negative electrode is the second input of photoelectrical coupler 201；
Phototriode Q emitter E is the first output end of photoelectrical coupler 201, and phototriode Q colelctor electrode C is photoelectricity coupling
Second output end of clutch 201.
Further, zero passage detection module 2 also includes：First electric capacity C1.Wherein, the first electric capacity C1 one end and the first electricity
The resistance R1 other end is connected, and the first electric capacity C1 other end ground connection GND, the first electric capacity C1 are used for the letter to output end ZERO outputs
Number it is filtered.
Further, zero passage detection module 2 also includes：Second resistance R2, second resistance are connected to photoelectrical coupler
Between first input end and the live wire of civil power, first resistor R1 is used to carry out input current limliting.
Further, zero passage detection module 2 also includes：3rd resistor R3.3rd resistor R3 one end and photoelectric coupling
Second output end of device 201 is connected, and the 3rd resistor R3 other end is connected with default power supply such as 5V DC sources, 3rd resistor R3
For pull-up resistor.
Thus, zero passage detection module 2 is made up of an optocoupler, three resistance and an electric capacity, and civil power is inputted for detecting
Signal period, and judge input civil power it is forward and reverse.Specifically, when city's electric signal inputs from the first of photoelectrical coupler 201
When end and the input of the second input, if the voltage of city's electric signal is in positive half period, light emitting diode D conductings are luminous, photosensitive
Triode Q is by light conduction, so as to which output end ZERO exports low level zero cross signal；If the voltage of city's electric signal is in negative
Half period, light emitting diode D cut-offs do not light, phototriode Q cut-offs, so as to which output end ZERO exports the zero passage of high level
Signal.Thus, control module 5 can judge the forward and reverse of input civil power according to zero cross signal, to determine opening point and close point.
The control device of transformer in micro-wave oven based on above-described embodiment, the embodiment of the present invention propose a kind of micro-wave oven
The control method of middle transformer.
Fig. 5 is the flow chart of the control method of transformer in micro-wave oven according to embodiments of the present invention.It is as shown in figure 5, micro-
The control method of transformer includes following steps in ripple stove：
S1：Receive door open command.
S2：The current flow of transformer is detected according to door open command, and controls transformer to close.
S3：Enabled instruction is received, and detects the zero cross signal of input civil power.
Specifically, zero cross signal can as shown in waveform 1 in Fig. 2, input civil power instantaneous voltage be less than predetermined threshold value when,
Export the zero cross signal of high level；When the instantaneous voltage for inputting civil power is more than predetermined threshold value, low level zero cross signal is exported,
Wherein, predetermined threshold value can be 0.
S4：Opening point and closing point according to corresponding to obtaining current flow, and according to zero cross signal and corresponding opening point
Started with point control transformer is closed.
That is, when fire door is thrown open, when detecting oven door opening, transformation when transformer is stopped is judged
The period position of the current flow of device, that is, the current flow for judging transformer be positioned at negative half-cycle or positioned at positive half period,
Afterwards, when detecting fire door closure and receiving the enabled instruction that user is inputted by control panel, i.e., start next time
During transformer, the opening point according to corresponding to obtaining the period position of current flow, and the unlatching according to corresponding to determining zero cross signal
Point in corresponding opening point control transformer to start, if micro-wave oven normal switching-off, in the period position pair of current flow
The closing point control micro-wave oven answered is closed, so as to avoid closing point higher excitation surge current caused by uncontrollable situation.
Thus, in micro-wave oven according to embodiments of the present invention transformer control method, cause to close point in unexpected enabling
In the case of uncontrollable, excitation surge current can be avoided excessive, avoid core flux saturation and transformer life from reducing.
According to one embodiment of present invention, opening point and closing point specifically include according to corresponding to obtaining current flow：
When current flow be on the occasion of when, select negative sense opening point and negative sense to close point；When current flow is negative value, positive open is selected
Point and positive closing point.Wherein it is possible to understand, positive opening point and positive closing point can be with line voltage (i.e. transformers
Voltage) positive half period two phases it is corresponding, and negative sense opening point and negative sense close point can be with the negative half period in line voltage
Two phases of phase are corresponding.Such as Fig. 2 example, positive opening point and positive closing point and negative sense opening point and negative sense closing point
Can respectively with for the phase 1, phase 2, phase 3 and the phase 4 that are marked in Fig. 2 on line voltage waveform it is corresponding.
Specifically, when a door is opened, if it is determined that the current flow of transformer is negative value, then transformation is restarted next time
During device, it is necessary to started in positive opening point control transformer.More specifically, such as Fig. 2 and Fig. 3 example, when transformer
When current flow is negative value, the current flow of transformer is between Fig. 2 midpoints D to point E, correspondingly, the winding production of transformer
Magnetisation field intensity H is in Fig. 3 on the left of reference axis, i.e., is arrived in 0 between-Hm.Afterwards, transformer starts to continue after oven door opening
Stream, also ,-Br the places that transformer stops E points in fig. 2 in afterflow, namely Fig. 3 stop afterflow, and thus, transformer is present
Remanent magnetism-Br.During restarting transformer next time, it is necessary to started in positive opening point control transformer, for example, to civil power electricity
Pressure is detected to generate zero cross signal, and when zero cross signal saltus step is low level, controllable timer starts timing, in timing
The timing time of device reaches positive opening point when reaching the first preset time, line voltage reaches phase 1, and control transformer is carried out
Start, offset remanent magnetism so as to produce forward current in the winding of transformer, reduce excitation surge current；Otherwise, if opened in negative sense
Point control transformer is started, the magnetic core of transformer will saturation quickly, cause exciting current very big exceeded.
On the contrary, when a door is opened, if it is determined that the current flow of transformer is on the occasion of then next to restart transformation
During device, it is necessary to started in negative sense opening point control transformer.More specifically, such as Fig. 2 and Fig. 3 example, when transformer
When current flow is negative value, the current flow of transformer is in Fig. 2 between C to point D, and correspondingly, the winding of transformer produces
Magnetic field intensity H is in Fig. 3 on the right side of reference axis, i.e., between 0~Hm.Afterwards, transformer starts afterflow after oven door opening,
Also, transformer stops D points in fig. 2 to stop afterflow at the Br in afterflow, namely Fig. 3, and thus, transformer has remanent magnetism
Br.During restarting transformer next time, it is necessary to started in negative sense opening point control transformer, for example, entering to line voltage
Row detection is to generate zero cross signal, and when it is high level that zero cross signal is by low transition, controllable timer starts timing,
The timing time of timer reaches negative sense opening point when reaching three preset times, line voltage reaches phase 3, controls transformer
Started, offset remanent magnetism so as to produce negative current in the winding of transformer, reduce excitation surge current；Otherwise, if in forward direction
Opening point control transformer is started, the magnetic core of transformer will saturation quickly, cause exciting current very big exceeded.
In addition, if micro-wave oven normal switching-off, then close point control micro-wave oven corresponding to the period position in current flow
Close.That is, when when current flow be on the occasion of when, select negative sense close point, that is, say, line voltage detected with life
Into zero cross signal, when it is high level that zero cross signal is by low transition, controllable timer starts timing, in the meter of timer
When the time reach positive when reaching the second preset time and close point, line voltage reaches phase 2, and control transformer is closed.When work as
When current flow is negative value, positive closing point is selected, that is, says, line voltage is detected, jumped in zero cross signal by high level
When being changed into low level, controllable timer starts timing, reaches just when the timing time of timer reaches four preset times
To point is closed, line voltage reaches phase 4, and control transformer is closed.
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 the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
Any process or method described otherwise above description in flow chart or herein is construed as, and represents to include
Module, fragment or the portion of the code of the executable instruction of one or more the step of being used to realize specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform 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 system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress used with reference to these instruction execution systems, device or equipment
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wiring
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(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, which can even is that, to print the paper of described program thereon or other are suitable
Medium, because can then enter edlin, interpretation or if 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 several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, have suitable combinational logic gate circuit application specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method carries
Suddenly it is that by program the hardware of correlation can be instructed to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although have been shown and retouch above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (7)
- A kind of 1. control device of transformer in micro-wave oven, it is characterised in that including：Fire door detection module, for exporting door open command when the fire door of the micro-wave oven is according to the instruction unpack of user；Zero passage detection module, for being detected input civil power to export zero cross signal；Transformer；Drive module, the drive module are used to drive the transformer to start or close；Control module, the control module respectively with the fire door detection module, the zero passage detection module and the driving mould Block is connected, and the control module is used to receive the door open command, and detects working as the transformer according to the door open command Preceding electric current controls the transformer to close to determine the period position residing for the current flow, and starts for receiving Instruction, and the zero cross signal of the input civil power is detected, and corresponding to the period position acquisition according to residing for the current flow Opening point and closing point, and the transformer progress is controlled according to the zero cross signal and the corresponding opening point and closing point Start；Wherein, when the current flow be on the occasion of when, control module selection negative sense opening point and negative sense close point；AndWhen the current flow is negative value, the control module selects positive opening point and positive closing point.
- 2. the control device of transformer in micro-wave oven as claimed in claim 1, it is characterised in that the zero passage detection module bag Include：Photoelectrical coupler, the first input end of the photoelectrical coupler are connected with the live wire of the civil power, the photoelectrical coupler The second input be connected with the zero line of the civil power, the first output head grounding of the photoelectrical coupler；AndFirst resistor, one end of the first resistor are connected with the second output end of the photoelectrical coupler, the first resistor The other end be connected with the control module for output end.
- 3. the control device of transformer in micro-wave oven as claimed in claim 2, it is characterised in that the zero passage detection module is also Including：First electric capacity, one end of first electric capacity are connected with the other end of the first resistor, first electric capacity it is another End ground connection.
- 4. the control device of transformer in micro-wave oven as claimed in claim 2, it is characterised in that the zero passage detection module is also Including：Second resistance, the second resistance be connected to the photoelectrical coupler first input end and the civil power live wire it Between.
- 5. the control device of transformer in micro-wave oven as claimed in claim 2, it is characterised in that the zero passage detection module is also Including：3rd resistor, one end of the 3rd resistor are connected with the second output end of the photoelectrical coupler, the 3rd resistor The other end be connected with default power supply.
- 6. the control device of transformer in micro-wave oven as claimed in claim 2, it is characterised in that the photoelectric coupling implement body Including：Light emitting diode, the anode of the light emitting diode are the first input end of the photoelectrical coupler, the light-emitting diodes The negative electrode of pipe is the second input of the photoelectrical coupler；WithPhototriode, the first output end of the extremely described photoelectrical coupler of transmitting of the phototriode, described photosensitive three Second output end of the extremely described photoelectrical coupler of the current collection of pole pipe.
- 7. the control method of transformer in a kind of micro-wave oven, it is characterised in that comprise the following steps：Receive door open command；The current flow of transformer is detected with the period position residing for determining the current flow according to the door open command, and controlled The transformer is made to close；Enabled instruction is received, and detects the zero cross signal of input civil power；AndOpening point and closing point corresponding to period position acquisition according to residing for the current flow, and according to the zero cross signal The transformer is controlled to be started with the corresponding opening point and closing point；Wherein, when the current flow be on the occasion of when, select negative sense opening point and negative sense to close point；AndWhen the current flow is negative value, positive opening point and positive closing point are selected.
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| CN201410690957.3A CN104362922B (en) | 2014-11-25 | 2014-11-25 | The control device and control method of transformer in micro-wave oven |
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| CN104362922B true CN104362922B (en) | 2018-01-30 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455165A (en) * | 2002-04-29 | 2003-11-12 | 乐金电子(天津)电器有限公司 | Microwave oven concurrently used as toasting bread |
| CA2359824C (en) * | 1999-12-09 | 2004-01-06 | Samsung Electronics Co., Ltd. | Driving circuit of dc microwave oven and method of controlling the same |
| CN1705179A (en) * | 2004-05-27 | 2005-12-07 | 乐金电子(天津)电器有限公司 | Surge current proof microwave oven circuit |
| CN101336016A (en) * | 2008-08-04 | 2008-12-31 | 深圳和而泰智能控制股份有限公司 | Micro-wave oven soft starting method and starting apparatus |
| CN102088802A (en) * | 2010-11-11 | 2011-06-08 | 美的集团有限公司 | Microwave tube starting impact current reduction control device and control method for microwave oven |
| CN202975135U (en) * | 2012-12-29 | 2013-06-05 | 宁波舜韵电子有限公司 | Zero-cross detection circuit with low standby power consumption |
-
2014
- 2014-11-25 CN CN201410690957.3A patent/CN104362922B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2359824C (en) * | 1999-12-09 | 2004-01-06 | Samsung Electronics Co., Ltd. | Driving circuit of dc microwave oven and method of controlling the same |
| CN1455165A (en) * | 2002-04-29 | 2003-11-12 | 乐金电子(天津)电器有限公司 | Microwave oven concurrently used as toasting bread |
| CN1705179A (en) * | 2004-05-27 | 2005-12-07 | 乐金电子(天津)电器有限公司 | Surge current proof microwave oven circuit |
| CN101336016A (en) * | 2008-08-04 | 2008-12-31 | 深圳和而泰智能控制股份有限公司 | Micro-wave oven soft starting method and starting apparatus |
| CN102088802A (en) * | 2010-11-11 | 2011-06-08 | 美的集团有限公司 | Microwave tube starting impact current reduction control device and control method for microwave oven |
| CN202975135U (en) * | 2012-12-29 | 2013-06-05 | 宁波舜韵电子有限公司 | Zero-cross detection circuit with low standby power consumption |
Non-Patent Citations (1)
| Title |
|---|
| 论消除负载变压器起动电流冲击的条件;陈广桢;《华南工学院学报》;19851231;第13卷(第4期);第48-55页 * |
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