CN104104059B - Micro-wave oven and its safety protective circuit and safety protection control method - Google Patents
Micro-wave oven and its safety protective circuit and safety protection control method Download PDFInfo
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- CN104104059B CN104104059B CN201410367962.0A CN201410367962A CN104104059B CN 104104059 B CN104104059 B CN 104104059B CN 201410367962 A CN201410367962 A CN 201410367962A CN 104104059 B CN104104059 B CN 104104059B
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Abstract
The invention discloses a kind of safety protective circuit of micro-wave oven, which includes：The current detector of the operating current of the heater of detection micro-wave oven；Control electric main is input to the first switch unit of heater, and first switch unit is connected between electric main and heater；The safety protection switch unit being connected between electric main and heater；Controller; controller is connected with current detector, first switch unit and safety protection switch unit; wherein; after controller control first switch unit disconnects; if current detector detects operating current more than preset value, controller is controlled to cut off the electric main for being input to heater to safety protection switch unit.The safety protective circuit can occur the power supply of cut-out heater when contact is merged in the relay in first switch unit, prevent heater continuous heating and bring potential safety hazard.The invention also discloses a kind of micro-wave oven and a kind of safety protection control method of micro-wave oven.
Description
Technical field
The present invention relates to cooking heater tool technical field, more particularly to a kind of safety protective circuit of micro-wave oven, one kind
Micro-wave oven with the safety protective circuit and a kind of safety protection control method of micro-wave oven.
Background technology
In heating process, the food temperature in furnace chamber understands rapid increase to micro-wave oven, so as to the temperature of micro-wave oven miscellaneous part
Degree also can be with rising.Once and situation about can not stop is heated in appearance extremely, microwave body constant temperature will be caused
Raise and cause potential safety hazard.
Existing electronic micro-wave oven, the switch that internal control heater is opened are generally relay.Internal circuit leads to
Cross the break-make of control relay and control the open and close of heater.If however, there is contact fusion and stick together in relay
When, at this moment relay no longer also cannot be disconnected again by internal circuit control, so that heater is by continuous heating, so not
But meeting burning foods, and with certain potential safety hazard.
The content of the invention
The purpose of the present invention is intended at least solve above-mentioned technological deficiency.
For this purpose, first purpose of the present invention is to propose a kind of safety protective circuit of micro-wave oven, accurately can detect
Whether the relay to control heater switch there is contact fusion, and cut-out heating dress when contact is merged occurs in relay
The power supply put, prevents heater continuous heating and brings potential safety hazard.
Second purpose 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 microwave
The safety protection control method of stove.
To reach above-mentioned purpose, a kind of safety protective circuit of micro-wave oven that first aspect present invention embodiment is proposed, bag
Include：For detecting the current detector of the operating current of the heater of the micro-wave oven；It is input to for controlling electric main
The first switch unit of the heater, the first switch unit be connected to the electric main and the heater it
Between；Safety protection switch unit, the safety protection switch unit are connected between the electric main and the heater；
Controller, the controller are connected with the current detector, the first switch unit and the safety protection switch unit,
Wherein, after the controller controls the first switch unit disconnection, if the current detector detects the work
Electric current is more than preset value, and the controller is controlled to the safety protection switch unit and is input to the heating dress to cut off
The electric main put.
The safety protective circuit of micro-wave oven according to embodiments of the present invention, by the operating current for increasing detection heater
Current detector and the safety protection switch unit that is connected between electric main and heater judging first switch list
Unit is with the presence or absence of exception, if the first relay that first switch unit is present in abnormal such as first switch unit occurs contact
Fusion, controller then by controlling safety protection switch unit cutting off the electric main for being input to heater, prevent heating
Device continuous firing and superheated cause the potential safety hazard that food burns and brings, and realize the safeguard protection work(of micro-wave oven
Can, it is ensured that microwave oven safety is reliably used, and meets the demand of user.
According to one embodiment of present invention, when the current detector is current transformer, the current transformer
Primary side is connected on the zero line or live wire of the electric main, and the safety protective circuit also includes and the current transformer
Secondary side be connected signaling conversion circuit.
Specifically, the signaling conversion circuit includes：First resistor, one end of the first resistor and the Current Mutual Inductance
One end of the secondary side winding of device is connected；First diode, the anode of first diode are another with the secondary side winding
One end is connected, and the negative electrode of first diode is connected with the other end of the first resistor；First electric capacity, first electric capacity
It is in parallel with the first resistor；Second electric capacity, one end of second electric capacity are grounded after being connected with one end of first electric capacity；
Second resistance, one end of the second resistance are connected with the other end of first electric capacity, the other end of the second resistance with
The other end of second electric capacity is connected with the controller after being connected.
According to one embodiment of present invention, the first switch unit includes：First relay, first relay
In switch be connected on the zero line or live wire of the electric main, one end of the coil in first relay ground connection；The
One triode, the colelctor electrode of first triode are connected with the other end of the coil in first relay, and described first
The base stage of triode is connected with the controller, and the emitter stage of the first triode is connected with the power supply of predeterminated voltage.
According to one embodiment of present invention, the safety protection switch unit includes：Normally closed relay, it is described it is normally closed after
Switch in electrical equipment is connected on the zero line or live wire of the electric main, a termination of the coil in the normally closed relay
Ground；Second triode, the colelctor electrode of second triode are connected with the other end of the coil in the normally closed relay, described
The base stage of the second triode is connected with the controller, the emitter stage of second triode and the power supply phase of the predeterminated voltage
Even；Wherein, when the operating current is more than the preset value, the controller controls second triode ON to control
The normally closed relay disconnects, to cut off the electric main for being input to the heater.
According to another embodiment of the invention, the safety protection switch unit includes：Second relay, described second
Switch in relay is connected between the zero line and live wire of the electric main, one end of the coil in second relay
Ground connection；3rd triode, the colelctor electrode of the 3rd triode are connected with the other end of the coil in second relay, institute
The base stage for stating the 3rd triode is connected with the controller, the emitter stage of the 3rd triode and the power supply of the predeterminated voltage
It is connected；Wherein, when the operating current is more than the preset value, the controller controls the 3rd triode ON to control
The second relay closure is made, so that electric main short circuit is connected on the fuse on the live wire, cut-out to fuse
It is input to the electric main of the heater.
A kind of micro-wave oven that second aspect present invention embodiment is proposed, including the safety protective circuit of above-mentioned micro-wave oven.
Micro-wave oven according to embodiments of the present invention, in end of cooking or time-out, control first switch unit disconnects cutting
The disconnected electric main for being input to heater, if now detecting the operating current of heater more than preset value, illustrates
First switch unit is not turned off, and represents that the first relay that first switch unit is present in abnormal such as first switch unit is sent out
Raw contact fusion, then by controlling safety protection switch unit cutting off the electric main for being input to heater, so as to prevent
Heater continuous firing and superheated cause the potential safety hazard that food burns and brings, and realize safety protection function.Cause
This, the micro-wave oven of the embodiment of the present invention safely and reliably can be used, and meet the demand of user.
Third aspect present invention embodiment proposes a kind of safety protection control method of micro-wave oven, wherein, the micro-wave oven
Including the safety protective circuit of above-mentioned micro-wave oven.The safety protection control method is comprised the following steps：In the micro-wave oven
After end of cooking or time-out, the first switch unit controlled in the safety protective circuit of the micro-wave oven disconnects；Detection is described
The operating current of the heater of micro-wave oven；When the operating current is more than preset value, in the safety protective circuit
Safety protection switch unit is controlled to cut off the electric main for being input to the heater.
The safety protection control method of micro-wave oven according to embodiments of the present invention, when cooking in microwave oven terminates or suspends,
Control first switch unit disconnects cutting off the electric main for being input to heater, and detects the operating current of heater,
If the operating current of heater is now detected more than preset value, illustrate that first switch unit is not turned off, expression the
Be present the first relay in abnormal such as first switch unit and contact fusion occur in one switch element, then protected by controlling safety
Shield switch element cutting off the electric main for being input to heater, so as to prevent heater continuous firing and superheated is made
The potential safety hazard burnt into food and bring, realizes the safety protection function of micro-wave oven so that micro-wave oven can be safe and reliable
Ground is used, and meets the demand of user.
According to one embodiment of present invention, when the safety protection switch unit includes normally closed relay, by control
Make the normally closed relay to disconnect to cut off the electric main for being input to the heater.
According to another embodiment of the invention, when the safety protection switch unit includes the second relay, pass through
The second relay closure is controlled so that electric main short circuit is connected on to fuse on the live wire of the electric main
Fuse, cut-out are input to the electric main of the heater.
The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
It is substantially and easy to understand, wherein：
Fig. 1 is the block diagram of the safety protective circuit of the micro-wave oven according to the embodiment of the present invention；
Fig. 2 is the circuit diagram of the safety protective circuit of the micro-wave oven according to one embodiment of the invention；
Fig. 3 is the circuit diagram of the safety protective circuit of the micro-wave oven according to another embodiment of the present invention；
Fig. 4 is the flow chart of the safety protection control method of the micro-wave oven according to the embodiment of the present invention；And
Fig. 5 is the flow chart of the safeguard protection subprogram of the single-chip microcomputer according to one embodiment of the invention.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
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, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the part and setting of specific examples are described.Certainly, they are only merely illustrative, and
Purpose does not lie in the restriction present invention.Additionally, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is the relation between itself not indicating discussed various embodiments and/or arranging for purposes of simplicity and clarity again.This
Outward, the invention provides various specific technique and material example, but those of ordinary skill in the art can be appreciated that
The use of the applicable property and/or other materials of other techniques.In addition, fisrt feature described below second feature it
" on " structure can include that the first and second features be formed as the embodiment of directly contact, it is also possible to including other feature shape
Into the embodiment between the first and second features, such first and second feature may not be directly contact.
In describing the invention, it should be noted that unless otherwise prescribed and limit, term " installation ", " being connected ",
" connection " should be interpreted broadly, for example, it may be mechanically connected or electrical connection, or the connection of two element internals, can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
With reference to the accompanying drawings to describe the safety protective circuit of the micro-wave oven of proposition according to embodiments of the present invention, with the peace
The safety protection control method of the micro-wave oven and micro-wave oven of full protection circuit.
Fig. 1 is the block diagram of the safety protective circuit of the micro-wave oven according to the embodiment of the present invention.As shown in figure 1, should
The safety protective circuit of micro-wave oven includes：Current detector 10, first switch unit 20, safety protection switch unit 30 and control
Device 40.
Wherein, current detector 10 is used for the operating current of the heater 1 for detecting the micro-wave oven, as shown in figure 1, electric
Current sensor 10 is connected on the zero line N of electric main；First switch unit 20 is input to heating dress for controlling electric main
1 switch for controlling heater 1 is put, first switch unit 20 is connected between the electric main and heater 1, for example
It is connected on the zero line N of electric main；Safety protection switch unit 30 is connected between the electric main and heater 1,
For example also it is connected on the zero line N of electric main；Controller 40 and current detector 10, first switch unit 20 and safeguard protection
Switch element 30 is connected, wherein, after the control first switch of controller 40 unit 10 disconnects, if current detector 10 is detected
The operating current is more than preset value, and controller 40 is controlled to safety protection switch unit 30 and is input to heating dress to cut off
Put 1 electric main.Also, fuse F1 and temperature detect switch (TDS) 2 are in series with the live wire L of electric main.
That is, after cooking in microwave oven terminates or suspends, at this moment controller has controlled first switch unit and has broken
Open and heater is disconnected and the power supply i.e. connection of electric main, if now current detector can also detect heater
Operating current be operating current more than preset value, then illustrate that first switch unit occurs in abnormal such as first switch unit
There is contact fusion without disconnecting in first relay, and controller control security protection unit is so that heater disconnects and power supply
Connection so that heater will not continuous heating and bring potential safety hazard, also will not carry out burning foods because of over-heating.
According to one embodiment of present invention, when current detector 10 is current transformer T1, the one of current transformer T1
Secondary side is connected on the zero line N or live wire L of the electric main, and safety protective circuit also includes secondary with current transformer T1
The signaling conversion circuit 50 that side is connected, as shown in Figure 2 or Figure 3, the primary side of current transformer T1 is connected on the zero of electric main
On line N.Current transformer T1 is used for the operating current for detecting heater 1.
Specifically, as shown in Figure 2 or Figure 3, signaling conversion circuit 50 includes：First resistor R1, the first diode D1, first
Electric capacity C1, the second electric capacity C2 and second resistance R2.Wherein, the secondary side winding of one end of first resistor R1 and current transformer T1
One end be connected, the anode of the first diode D1 is connected with the other end of the secondary side winding, the negative electrode of the first diode D1
It is connected with the other end of first resistor R1, the first electric capacity C1 is in parallel with first resistor R1, one end of the second electric capacity C2 is electric with first
Hold C1 one end be connected after be grounded, one end of second resistance R2 is connected with the other end of the first electric capacity C1, second resistance R2 it is another
One end is connected with such as single-chip microcomputer of controller 40 after being connected with the other end of the second electric capacity C2.
In an embodiment of the present invention, by the first diode D1, first resistor R1, the first electric capacity C1, second resistance R2,
The signaling conversion circuit of two electric capacity C2 compositions, for current signal is converted into data signal I_Detect, wherein data signal
High level represents the loop of heater 1 operating current, and operating current is more than preset value.Such as heater normal work
When operating current be 5～7A, when not working electric current be less than 1A, the secondary side of current transformer T1 is when heater works two
Secondary side output current is 5～7mA, and when not working, output current is less than 1mA, and the electric current of current transformer T1 secondary sides output is passed through
After diode D1, resistance R1, electric capacity C1 rectifying and wave-filterings, output voltage signal, through the LPF of resistance R2, electric capacity C2 composition
Device, filters noise and exports pure voltage signal, wherein, current versus voltage relation：1mA/0.75V, i.e. heater work
When export 3.75～5.25V, when not working, output is less than 0.75V.
In an embodiment of the present invention, first switch unit 20 includes：First relay RLY1 and the first triode QR1.
Switch in first relay RLY1 is connected on the zero line or live wire of the electric main, as shown in Figure 2 or Figure 3, first after
Switch in electrical equipment RLY1 is connected on the zero line N of the electric main, one end ground connection of the coil in the first relay RLY1；
The colelctor electrode of the first triode QR1 is connected with the other end of the coil in the first relay RLY1, the base stage of the first triode QR1
It is connected with controller 40, the emitter stage of the first triode QR1 is connected with the power supply of predeterminated voltage such as 12V.
According to one embodiment of present invention, safety protection switch unit 30 includes：Normally closed relay RLY2 and the two or three
Pole pipe QR2.Switch in normally closed relay RLY2 is connected on the zero line or live wire of the electric main, as shown in Fig. 2 normally closed
Switch in relay RLY2 is connected on the zero line of the electric main, a termination of the coil in normally closed relay RLY2
Ground；The colelctor electrode of the second triode QR2 is connected with the other end of the coil in normally closed relay RLY2, the second triode QR2's
Base stage is connected with controller 40, and the emitter stage of the second triode QR2 is connected with the power supply of predeterminated voltage such as 12V.Wherein, in institute
When stating operating current more than the preset value, controller 40 controls the second triode QR2 conductings to control normally closed relay RLY2
Disconnect, to cut off the electric main for being input to heater 1.
That is, in the present embodiment, as shown in Fig. 2 after cooking in microwave oven terminates, such as single-chip microcomputer of controller 40
Disconnect to RLY1_C high level signals, control the first triode QR1 cut-offs to control the first relay RLY1.Wherein, if
First relay RLY1 is normal, then heater 1 with the first relay RLY1 disconnects and cut off and power supply be electric main company
Connect.If the first relay RLY1 occurs contact fusion, no longer controlled and disconnects, now current transformer T1 is detected and is added
The operating current of thermal 1 is more than preset value, and current signal is converted into data signal I_Detect by signaling conversion circuit 50, i.e.,
Detection I_Detect signals, if greater than 3.5V, then prove that the first relay RLY1 occurs exception and normally can not disconnect, this time control
Such as single-chip microcomputer of device processed 40 gives RLY2_C low level signals, for controlling the second triode QR2 conductings to control normally closed relay
RLY2 disconnects, so as to cut off the connection of heater 1 and power supply.
Therefore, the safety protective circuit of the micro-wave oven of the present embodiment is by increasing Current Mutual Inductance on the loop of heater
Device and normally closed relay, using current transformer detect heater loop on whether have operating current, judge first after
Whether the contact of electrical equipment merges, and is disconnected by controlling normally closed relay to cut off heating if the contact of the first relay is merged
The power supply of device, prevents heater superheated and the potential safety hazard brought, realizes the safety protection function of micro-wave oven.
According to another embodiment of the invention, as shown in figure 3, safety protection switch unit 30 includes：Second relay
RLY3 and the 3rd triode QR3.Switch in second relay RLY3 be connected to the electric main zero line N and live wire L it
Between, one end ground connection of the coil in the second relay RLY3；In the colelctor electrode of the 3rd triode QR3 and the second relay RLY3
The other end of coil is connected, and the base stage of the 3rd triode QR3 is connected with controller 40, the emitter stage of the 3rd triode QR3 with it is pre-
If the power supply of voltage such as 12V is connected.Wherein, when the operating current is more than the preset value, the control of controller 40 the 3rd
Triode QR3 conductings are to control the second relay RLY3 closures, so that electric main short circuit is connected on fusing on live wire L
Fuse F1, so as to cut off the electric main for being input to heater 1.
That is, in the present embodiment, as shown in figure 3, after cooking in microwave oven terminates, such as single-chip microcomputer of controller 40
Disconnect to RLY1_C high level signals, control the first triode QR1 cut-offs to control the first relay RLY1.Wherein, if
First relay RLY1 is normal, then heater 1 with the first relay RLY1 disconnects and cut off and power supply be electric main company
Connect.If the first relay RLY1 occurs contact fusion, no longer controlled and disconnects, now current transformer T1 is detected and is added
The operating current of thermal 1 is more than preset value, and current signal is converted into data signal I_Detect by signaling conversion circuit 50, i.e.,
Detection I_Detect signals, if greater than 3.5V, then prove that the first relay RLY1 occurs exception and normally can not disconnect, this time control
Such as single-chip microcomputer of device processed 40 gives RLY3_C low level signals, for controlling the 3rd triode QR2 conductings to control the second relay
RLY3 is closed so that electric main short circuit, so that the fuse F1 being connected on live wire L disconnects, and then cuts off heater 1
With the connection of power supply such as electric main.
In an embodiment of the present invention, the first relay RLY1 and the second relay RLY2 are normally opened relay.Heating
Device 1 includes but is only limitted to the devices such as magnetron, barbecue heat-generating pipe, hot air convection.
The safety protective circuit of micro-wave oven according to embodiments of the present invention, by the operating current for increasing detection heater
Current detector and the safety protection switch unit that is connected between electric main and heater judging first switch list
Unit is with the presence or absence of exception, if the first relay that first switch unit is present in abnormal such as first switch unit occurs contact
Fusion, controller then by controlling safety protection switch unit cutting off the electric main for being input to heater, prevent heating
Device continuous firing and superheated cause the potential safety hazard that food burns and brings, and realize the safeguard protection work(of micro-wave oven
Can, it is ensured that microwave oven safety is reliably used, and meets the demand of user.
Additionally, embodiments of the invention also proposed a kind of micro-wave oven, which includes the safeguard protection electricity of above-mentioned micro-wave oven
Road.
Micro-wave oven according to embodiments of the present invention, in end of cooking or time-out, control first switch unit disconnects cutting
The disconnected electric main for being input to heater, if now detecting the operating current of heater more than preset value, illustrates
First switch unit is not turned off, and represents that the first relay that first switch unit is present in abnormal such as first switch unit is sent out
Raw contact fusion, then by controlling safety protection switch unit cutting off the electric main for being input to heater, so as to prevent
Heater continuous firing and superheated cause the potential safety hazard that food burns and brings, and realize safety protection function.Cause
This, the micro-wave oven of the embodiment of the present invention safely and reliably can be used, and meet the demand of user.
Fig. 4 is the flow chart of the safety protection control method of the micro-wave oven according to the embodiment of the present invention.Wherein, the micro-wave oven
For the micro-wave oven of above-described embodiment description, which includes above-mentioned safety protective circuit.As shown in figure 4, the safety guarantor of the micro-wave oven
Shield control method is comprised the following steps：
S1, after cooking in microwave oven terminates or suspends, controls the first switch list in the safety protective circuit of micro-wave oven
Unit disconnects.
S2, detects the operating current of the heater of micro-wave oven.
S3, when operating current is more than preset value, is controlled to the safety protection switch unit in safety protective circuit
To cut off the electric main for being input to heater.
According to one embodiment of present invention, when the safety protection switch unit includes normally closed relay, by control
Make the normally closed relay to disconnect to cut off the electric main for being input to the heater.Specifically, tie in cooking in microwave oven
After beam or time-out, controller such as single-chip microcomputer calls safeguard protection subprogram, as shown in figure 5, the safeguard protection subprogram
Flow process is：
S501, after cooking in microwave oven terminates or suspends, monolithic machine testing data signal I_Detect reads I_
Detect signals.
S502, judges whether I_Detect signals are high level, i.e., whether I_Detect signals are equal to 1.If it is, holding
Row step S503；If it is not, then judging that the first relay RLY1 is normal, main program is directly returned.
S503, RLY2_C=0.That is, if high level, then judging that the first relay RLY1 occurs exception for example
Generation contact is merged, and provides the instruction for opening RLY2, and returns main program.Say, single-chip microcomputer gives signal RLY2_C low levels, the
Two triode QR2 are turned on, and normally closed relay RLY2 disconnects, and so as to cut off the power supply of heater, heater stop heating is real
The safety protection function of existing micro-wave oven.
According to another embodiment of the invention, when the safety protection switch unit includes the second relay, pass through
The second relay closure is controlled so that electric main short circuit is connected on to fuse on the live wire of the electric main
Fuse, cut-out are input to the electric main of the heater.
The safety protection control method of micro-wave oven according to embodiments of the present invention, when cooking in microwave oven terminates or suspends,
Control first switch unit disconnects cutting off the electric main for being input to heater, and detects the operating current of heater,
If the operating current of heater is now detected more than preset value, illustrate that first switch unit is not turned off, expression the
Be present the first relay in abnormal such as first switch unit and contact fusion occur in one switch element, then protected by controlling safety
Shield switch element cutting off the electric main for being input to heater, so as to prevent heater continuous firing and superheated is made
The potential safety hazard burnt into food and bring, realizes the safety protection function of micro-wave oven so that micro-wave oven can be safe and reliable
Ground is used, and meets the demand of user.
In flow chart or here any process described otherwise above or method description are construed as, expression includes
It is one or more for realizing specific logical function or process the step of the module of code of executable instruction, fragment or portion
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein the suitable of shown or discussion can not be pressed
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 here logic described otherwise above and/or step, for example, are considered use in flow charts
In the order list of the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (as computer based system, the system including processor or other can hold from instruction
The system of row system, device or equipment instruction fetch execute instruction) use, or with reference to 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
The dress that defeated program is used for instruction execution system, device or equipment or with reference to these instruction execution systems, device or equipment
Put.The more specifically example (non-exhaustive list) of computer-readable medium is including following：With the electricity that one or more connect up
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 can even is that the paper that can print described program thereon or other are suitable
Medium, because for example by carrying out optical scanner to paper or other media edlin, interpretation can then be entered or if necessary with which
His suitable method is processed to electronically 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, the software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realizing.For example, if realized with hardware, and in another embodiment, can be with well known in the art
Any one of row technology or their combination are realizing：With for the logic gates of logic function is realized to data-signal
Discrete logic, the special IC with suitable combinational logic gate 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 is carried
Suddenly the hardware that can be by program to instruct correlation is completed, and 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.
Additionally, each functional unit in each embodiment of the invention can be integrated in a processing module, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a module.Above-mentioned integrated mould
Block both can be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit using in the form of software function module realize and as independent production marketing or use when, it is also possible to be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
Example ", or the description of " some examples " etc. mean specific features with reference to the embodiment or example description, structure, material or spy
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 are referred to necessarily.And, the specific features of description, structure, material or feature can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding can carry out various changes, modification, replacement to these embodiments without departing from the principles and spirit of the present invention
And modification, the scope of the present invention is by claims and its is equal to limit.
Claims (13)
1. a kind of safety protective circuit of micro-wave oven, it is characterised in that include：
For detecting the current detector of the operating current of the heater of the micro-wave oven；
The first switch unit of the heater is input to for controlling electric main, the first switch unit is connected to institute
State between electric main and the heater；
Safety protection switch unit, the safety protection switch unit be connected to the electric main and the heater it
Between, the safety protection switch unit includes：Normally closed relay, the switch in the normally closed relay are connected on the exchange city
On the zero line or live wire of electricity, one end ground connection of the coil in the normally closed relay；Second triode, second triode
Colelctor electrode is connected with the other end of the coil in the normally closed relay, and the base stage of second triode is connected with controller,
The emitter stage of the second triode is connected with the power supply of predeterminated voltage；
Controller, the controller and the current detector, the first switch unit and the safety protection switch unit
Be connected, wherein, control after the first switch unit disconnects in the controller, if the current detector detect it is described
Operating current is more than preset value, and the controller controls second triode ON and disconnected with controlling the normally closed relay,
To cut off the electric main for being input to the heater.
2. the safety protective circuit of micro-wave oven as claimed in claim 1, it is characterised in that the current detector is that electric current is mutual
During sensor, the primary side of the current transformer is connected on the zero line or live wire of the electric main, the safeguard protection electricity
Road also includes the signaling conversion circuit being connected with the secondary side of the current transformer.
3. the safety protective circuit of micro-wave oven as claimed in claim 2, it is characterised in that the signaling conversion circuit includes：
First resistor, one end of the first resistor are connected with one end of the secondary side winding of the current transformer；
First diode, the anode of first diode are connected with the other end of the secondary side winding, the one or two pole
The negative electrode of pipe is connected with the other end of the first resistor；
First electric capacity, first electric capacity are in parallel with the first resistor；
Second electric capacity, one end of second electric capacity are grounded after being connected with one end of first electric capacity；
Second resistance, one end of the second resistance are connected with the other end of first electric capacity, the second resistance it is another
End is connected with the controller after being connected with the other end of second electric capacity.
4. the safety protective circuit of the micro-wave oven as any one of claim 1-3, it is characterised in that the first switch
Unit includes：
First relay, the switch in first relay are connected on the zero line or live wire of the electric main, and described
One end ground connection of the coil in one relay；
First triode, the colelctor electrode of first triode are connected with the other end of the coil in first relay, institute
The base stage for stating the first triode is connected with the controller, the emitter stage of first triode and the power supply phase of predeterminated voltage
Even.
5. a kind of safety protective circuit of micro-wave oven, it is characterised in that include：
For detecting the current detector of the operating current of the heater of the micro-wave oven；
The first switch unit of the heater is input to for controlling electric main, the first switch unit is connected to institute
State between electric main and the heater；
Safety protection switch unit, the safety protection switch unit be connected to the electric main and the heater it
Between, the safety protection switch unit includes：Second relay, the switch in second relay are connected to the exchange city
Between the zero line and live wire of electricity, one end ground connection of the coil in second relay；3rd triode, the 3rd triode
Colelctor electrode be connected with the other end of the coil in second relay, the base stage and controller phase of the 3rd triode
Even, the emitter stage of the 3rd triode is connected with the power supply of predeterminated voltage；Controller, the controller and the current detecting
Device, the first switch unit are connected with the safety protection switch unit, wherein, open in controller control described first
After closing unit disconnection, if the current detector detects the operating current more than preset value, the controller controls institute
The 3rd triode ON is stated to control second relay closure so that electric main short circuit be connected on fusing it is described
Fuse on live wire, cut-out are input to the electric main of the heater.
6. the safety protective circuit of micro-wave oven as claimed in claim 5, it is characterised in that the current detector is that electric current is mutual
During sensor, the primary side of the current transformer is connected on the zero line or live wire of the electric main, the safeguard protection electricity
Road also includes the signaling conversion circuit being connected with the secondary side of the current transformer.
7. the safety protective circuit of micro-wave oven as claimed in claim 6, it is characterised in that the signaling conversion circuit includes：
First resistor, one end of the first resistor are connected with one end of the secondary side winding of the current transformer；
First diode, the anode of first diode are connected with the other end of the secondary side winding, the one or two pole
The negative electrode of pipe is connected with the other end of the first resistor；
First electric capacity, first electric capacity are in parallel with the first resistor；
Second electric capacity, one end of second electric capacity are grounded after being connected with one end of first electric capacity；
Second resistance, one end of the second resistance are connected with the other end of first electric capacity, the second resistance it is another
End is connected with the controller after being connected with the other end of second electric capacity.
8. the safety protective circuit of the micro-wave oven as any one of claim 5-7, it is characterised in that the first switch
Unit includes：
First relay, the switch in first relay are connected on the zero line or live wire of the electric main, and described
One end ground connection of the coil in one relay；
First triode, the colelctor electrode of first triode are connected with the other end of the coil in first relay, institute
The base stage for stating the first triode is connected with the controller, the emitter stage of first triode and the power supply phase of predeterminated voltage
Even.
9. a kind of micro-wave oven, it is characterised in that include the safeguard protection electricity of the micro-wave oven as any one of claim 1-4
Road.
10. a kind of micro-wave oven, it is characterised in that include the safeguard protection of the micro-wave oven as any one of claim 5-8
Circuit.
11. a kind of safety protection control methods of the micro-wave oven as described in claim 9 or 10, it is characterised in that including following
Step：
After the cooking in microwave oven terminates or suspends, the first switch list in the safety protective circuit of the micro-wave oven is controlled
Unit disconnects；
Detect the operating current of the heater of the micro-wave oven；
When the operating current is more than preset value, the safety protection switch unit in the safety protective circuit is controlled
To cut off the electric main for being input to the heater.
12. safety protection control methods as claimed in claim 11, it is characterised in that when the safety protection switch unit bag
When including normally closed relay, disconnected by controlling the normally closed relay to cut off the electric main for being input to the heater.
13. safety protection control methods as claimed in claim 11, it is characterised in that when the safety protection switch unit bag
When including the second relay, by control second relay closure so that electric main short circuit be connected on fusing it is described
Fuse on the live wire of electric main, cut-out are input to the electric main of the heater.
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| CN201410367962.0A CN104104059B (en) | 2014-07-29 | 2014-07-29 | Micro-wave oven and its safety protective circuit and safety protection control method |
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| CN106159871A (en) * | 2016-07-05 | 2016-11-23 | 宁德时代新能源科技股份有限公司 | Protection circuit and circuit protection method |
| CN107359598B (en) * | 2017-08-30 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of inlet air heating relay fault diagnosis and protection circuit, method and system |
| CN109357292B (en) * | 2018-09-12 | 2020-11-03 | 广东美的厨房电器制造有限公司 | Cooking apparatus |
| CN110638335A (en) * | 2019-09-02 | 2020-01-03 | 珠海格力电器股份有限公司 | Cooking equipment safety control method and device, storage medium and cooking equipment |
| CN113949032A (en) * | 2020-07-16 | 2022-01-18 | 上海汽车集团股份有限公司 | High-voltage circuit cutting method, controller and high-voltage system |
| CN113108446B (en) * | 2021-05-07 | 2022-07-12 | 珠海拓芯科技有限公司 | Electric heating protection circuit and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204012659U (en) * | 2014-07-29 | 2014-12-10 | 广东美的厨房电器制造有限公司 | Microwave oven and safety protective circuit thereof |
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| CN1231706C (en) * | 2001-12-25 | 2005-12-14 | 乐金电子(天津)电器有限公司 | Overcurrent protection circuit for microwave oven |
| CN1979006A (en) * | 2005-11-30 | 2007-06-13 | 海尔集团公司 | Microwave-oven power-supply voltage monitoring circuit and method for protecting abnormal power-supply voltage |
| US20070139844A1 (en) * | 2005-12-16 | 2007-06-21 | Horey Leonard I | Power safety circuit for small appliances |
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| CN204012659U (en) * | 2014-07-29 | 2014-12-10 | 广东美的厨房电器制造有限公司 | Microwave oven and safety protective circuit thereof |
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