CN205725688U - Electromagnetic heating system and the delayed of switching tube thereof open protection device - Google Patents
Electromagnetic heating system and the delayed of switching tube thereof open protection device Download PDFInfo
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- CN205725688U CN205725688U CN201620486103.8U CN201620486103U CN205725688U CN 205725688 U CN205725688 U CN 205725688U CN 201620486103 U CN201620486103 U CN 201620486103U CN 205725688 U CN205725688 U CN 205725688U
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Abstract
The utility model discloses a kind of electromagnetic heating system and the delayed of switching tube opens protection device; described electromagnetic heating system includes the resonance circuit being made up of heating coil, resonant capacitance and switching tube and the power supply circuits powered for described resonance circuit, and described delayed protection device of opening includes: testing circuit is connected with switching tube and generates detection signal with the operating current according to switching tube；The operating current of energy consumption circuit switch tube carries out shunting to consume the energy that resonance circuit produces；Control circuit is respectively connected with testing circuit and energy consumption circuit, according to detection signal, control circuit judges that controlling energy consumption circuit when switching tube is in delayed opening state is operated, so that the operating current of switching tube is limited in preset range, thus prevent the biggest electric current breakdown switch pipe under delayed opening state, reduce switching tube switching loss, the job stability of guarantee system, reduces potential safety hazard, extends the service life of switching tube.
Description
Technical field
This utility model relates to household electrical appliance technical field, delayed particularly to a kind of electromagnetic heating system breaker in middle pipe
Open protection device and a kind of electromagnetic heating system with it.
Background technology
Switching tube is one of core devices in electromagnetic oven heating system, and the optimum Working of switching tube is at colelctor electrode
Voltage over zero is open-minded, so that switching loss is minimum.But, in actual heating process, there are the delayed feelings opened in switching tube
Condition, can produce moment peak value negative current such as-60A under delayed opening state, thus aggravation is opened in electromagnetic heating system
Closing pipe switching loss, affect the job stability of circuit, even directly or indirectly, there is potential safety hazard in breakdown switch pipe.But,
Correlation technique only relies on the characteristic of switching tube self, unprotect measure.
Therefore, correlation technique needs to improve.
Utility model content
One of technical problem that this utility model is intended to solve in correlation technique the most to a certain extent.To this end, this reality
Being that proposing a kind of the delayed of electromagnetic heating system breaker in middle pipe opens protection device by a novel purpose, this device is permissible
The electric current that will be late by flowing through under state switching tube controls in less and basicly stable state, to reduce the switch damage of switching tube
Consumption.
Another purpose of the present utility model is to propose a kind of electromagnetic heating system.
For reaching above-mentioned purpose, delayed the opening of a kind of electromagnetic heating system breaker in middle pipe that on the one hand this utility model proposes
Logical protection device, described electromagnetic heating system include the resonance circuit that is made up of heating coil, resonant capacitance and switching tube and
The power supply circuits powered for described resonance circuit, described delayed protection device of opening includes: testing circuit, described testing circuit with
Described switching tube is connected and generates detection signal with the operating current according to described switching tube；Energy consumption circuit, described energy disappears
The operating current of described switching tube is shunted to consume the energy that described resonance circuit produces by power consumption road；Control circuit, institute
Stating control circuit to be respectively connected with described testing circuit and described energy consumption circuit, described control circuit is according to described detection letter
Number judge that described switching tube controls described energy consumption circuit and is operated, with by described switching tube when being in delayed opening state
Operating current be limited in preset range.
According to the delayed protection device of opening of the electromagnetic heating system breaker in middle pipe that the utility model proposes, testing circuit root
Generating detection signal according to the operating current of switching tube, the operating current of energy consumption circuit switch tube carries out shunting consuming humorous
The energy that the circuit that shakes produces, control circuit judges to control energy expenditure when switching tube is in delayed opening state according to detection signal
Circuit is operated, and to be limited in preset range by the operating current of switching tube, thus prevents under delayed opening state reverse
Big electric current breakdown switch pipe, reduces switching tube switching loss, it is ensured that the job stability of system, reduces potential safety hazard, and prolongation is opened
Close the service life of pipe.
Further, described testing circuit includes: current sampling unit, described current sampling unit and described switching tube phase
Even generate current sampling signal with the operating current according to described switching tube；Voltage detection unit, described voltage detection unit with
Described current sampling unit is connected to generate detection signal according to described current sampling signal.
Specifically, described switching tube can be IGBT, and described current sampling unit includes sampling resistor, described sampling resistor
One end is connected with the emitter stage of described IGBT, and the grounded emitter of described IGBT, and the other end of described sampling resistor is with described
Voltage detection unit is connected.
Further, described voltage detection unit includes: the first resistance, one end of described first resistance and described sampling electricity
The other end of resistance is connected；Second resistance, one end of described second resistance is connected with the other end of described first resistance, and described second
The other end of resistance is connected with default power supply, has primary nodal point between described first resistance and described second resistance, and described
One node is in order to export described detection signal.
Further, to include that controllable switch components, described controllable switch components are connected in parallel on described for described energy consumption circuit
Between colelctor electrode and the emitter stage of switching tube.
Specifically, described controllable switch components includes at least one relay or metal-oxide-semiconductor.
Further, described control circuit includes: driver element, and described driver element is connected with described energy consumption circuit
To drive described energy consumption circuit be operated or quit work；Control chip, the input of described control chip is with described
Testing circuit is connected, and the outfan of described control chip is connected with described driver element.
Further, described driver element includes: the first audion and the second audion, the collection of described first audion
Electrode is connected with default power supply, and the emitter stage of described first audion is connected with the emitter stage of described second audion, and described
The base stage of one audion is connected with the base stage of described second audion, the grounded collector of described second audion, and described first
There is between emitter stage and the emitter stage of described second audion of audion secondary nodal point, the base stage of described first audion and
Having the 3rd node between the base stage of described second audion, wherein, described 3rd node is connected with described control chip；3rd
Resistance, one end of described 3rd resistance is connected with described secondary nodal point, the other end of described 3rd resistance and described gate-controlled switch
Assembly is connected；Stabilivolt, the negative electrode of described stabilivolt is connected with the other end of described 3rd resistance, and the anode of described stabilivolt connects
Ground.
For reaching above-mentioned purpose, a kind of electromagnetic heating system that on the other hand this utility model proposes, including described electricity
The delayed of magnetic heating system breaker in middle pipe opens protection device.
According to the electromagnetic heating system that the utility model proposes, delayed by above-mentioned switching tube opens protection device,
The operating current of switching tube can be limited in preset range when switching tube is in delayed opening state, thus prevent delayed open-minded
Under state, the biggest electric current breakdown switch pipe, reduces switching tube switching loss, it is ensured that the job stability of system, reduces safety hidden
Suffer from, extend the service life of switching tube.
Preferably, described electromagnetic heating system can be electromagnetic oven, electromagnetic electric cooker or prevention electromagnetic pressure cooker.
Accompanying drawing explanation
Fig. 1 is the delayed side opening protection device of the electromagnetic heating system breaker in middle pipe according to this utility model embodiment
Frame schematic diagram；
Fig. 2 is that the delayed of electromagnetic heating system breaker in middle pipe according to one embodiment of this utility model opens protection device
Block diagram；
Fig. 3 is the delayed electricity opening protection device of the electromagnetic heating system breaker in middle pipe according to this utility model embodiment
Road schematic diagram；And
Fig. 4 is the block diagram of the electromagnetic heating system according to this utility model embodiment.
Reference:
Electromagnetic heating system 10, resonance circuit 20, power supply circuits 30, delayed open protection device 40, testing circuit 50, energy
Amount consumes circuit 60, control circuit 70 and switching tube 80；
Heating coil L1 and resonant capacitance C1；Rectification chip D1 and filtration module 301；
Current sampling unit 501 and voltage detection unit 502；Driver element 701, control chip 702 and filter unit
703；
Sampling resistor R0, the first resistance R1, the second resistance R2, the 4th resistance R4 and the 4th electric capacity C4；
First audion Q1, the second audion Q2, the 3rd resistance R3 and stabilivolt ZD1.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
It is exemplary for examining the embodiment that accompanying drawing describes, it is intended to be used for explaining this utility model, and it is not intended that to this utility model
Restriction.
Below with reference to the accompanying drawings electromagnetic heating system and switching tube thereof that this utility model embodiment proposes are described in detail
Delayed open protection device.
Fig. 1 is the delayed side opening protection device of the electromagnetic heating system breaker in middle pipe according to this utility model embodiment
Frame schematic diagram.As Figure 1-3, this electromagnetic heating system 10 includes by heating coil L1, resonant capacitance C1 and switching tube 80 groups
Become resonance circuit 20 and be resonance circuit 20 power power supply circuits 30.Wherein, power supply circuits 30 are whole Electromagnetic Heating
The energy source of system；Resonance circuit 20 is the heating unit of whole electromagnetic heating system.
Specifically, according to the embodiment of Fig. 3, power supply circuits 30 include: rectifier module D 1 and filtration module 301, rectification mould
The input of block D1 and alternating current power supply such as 220V city is electrically connected, and rectifier module D 1 is entered for the alternating current providing alternating current power supply
Row rectification processes；The input of filtration module 301 is connected with the outfan of rectifier module D 1, and filtration module 301 is for rectification
After alternating current be filtered processing, to export galvanic current source, electricity of so powering by the outfan of filtration module 301
Road 30 is to exporting galvanic current source after AC rectification, Filtering Processing to electromagnetic heating system 10.
More specifically, as it is shown on figure 3, filtration module 301 can include filter inductance L2, the first filter capacitor C2 and the second filter
Ripple electric capacity C3, wherein, one end of filter inductance L2 is connected with the first outfan of rectifier module D 1, the other end of filter inductance L2
The first outfan as filtration module 301；One end of first filter capacitor C2 is connected with one end of filter inductance L2, the first filter
The other end of ripple electric capacity C2 is connected with the second outfan of rectifier module D 1；One end of second filter capacitor C3 and filter inductance L2
The other end be connected, the other end of the second filter capacitor C3 and the other end of the first filter capacitor C2 are connected, the second filter capacitor
The other end of C3 is also as the second outfan of filtration module 301.
According to the embodiment of Fig. 3, coil L1 is in parallel with resonant capacitance C1 in heating, heating coil L1 in parallel and resonant capacitance
One end of C1 is connected with the first outfan of filtration module 301, the other end of heating coil L1 in parallel and resonant capacitance C1 and
The colelctor electrode of switching tube 80 is connected, and the grounded emitter of switching tube 80 is also connected with the second outfan of filtration module 301, switchs
The control pole of pipe 80 is connected with driver element.Specifically, switching tube 80 is on or off under the driving of driver element, to control
Resonance circuit 20 converts electrical energy into electromagnetic energy, thus realizes resonance heating.
As it is shown in figure 1, the delayed protection device 40 of opening of this utility model embodiment includes: testing circuit 50, energy disappear
Power consumption road 60 and control circuit 70.
Wherein, testing circuit 50 is connected with switching tube 80 with the operating current generation detection signal according to switching tube 80；Energy
Amount consumes the operating current of circuit 60 switch tube 80 and carries out shunting to consume the energy that resonance circuit 20 produces；Control circuit 70
Being respectively connected with testing circuit 50 and energy consumption circuit 60, according to detection signal, control circuit 70 judges that switching tube 80 is in stagnant
Control energy consumption circuit 60 during rear opening state to be operated, be limited in preset range with the operating current by switching tube 80
In.
It should be noted that when switching tube 80 is off state, the operating current of switching tube 80 is zero；Work as switching tube
80 when being in anhysteretic opening state, and the operating current of switching tube 80 is forward current；Delayed shape is opened when switching tube 80 is in
During state, can produce reversing oscillating current signal in loop, the operating current of switching tube 80 is reverse current.So, by detection
The operating current of switching tube 80 is it may determine that whether switching tube 80 is in hysteretic state.
Specifically, when electromagnetic heating system is operated, testing circuit 50 detects the operating current of switching tube 80 also
Generate detection signal, according to detection signal, control circuit 70 judges whether the operating current of switching tube 80 is reverse current, if
The operating current of switching tube 80 is reverse current, and control circuit 70 then judges that switching tube 80 is in delayed opening state, and controls
Energy consumption circuit 60 is open-minded, and control circuit 70 also can obtain the delayed journey of switching tube 80 according to the amplitude of reverse current
Degree, and control the switching tube 80 service time in each make and break period, with by switching tube according to the delay degree of switching tube 80
The operating current of 80 is limited in preset range.
Thus, the delayed of the electromagnetic heating system breaker in middle pipe proposed according to this utility model embodiment opens protection dress
Putting, testing circuit generates detection signal according to the operating current of switching tube, and the operating current of energy consumption circuit switch tube enters
Row shunting is to consume the energy that resonance circuit produces, according to detection signal, control circuit judges that switching tube is in delayed opening state
Time control energy consumption circuit be operated, so that the operating current of switching tube is limited in preset range, thus prevent delayed
Under opening state, the biggest electric current breakdown switch pipe, reduces switching tube switching loss, it is ensured that the job stability of system, reduces peace
Full hidden danger, extends the service life of switching tube.
According to an embodiment of the present utility model, as in figure 2 it is shown, testing circuit 50 includes: current sampling unit 501 He
Voltage detection unit 502.
Wherein, current sampling unit 501 be connected with switching tube 80 with according to switching tube 80 operating current generate electric current adopt
Sample signal；Voltage detection unit 502 is connected with current sampling unit 501 to generate detection signal according to current sampling signal.
Specifically, as it is shown on figure 3, switching tube 80 be IGBT (Insulated Gate Bipolar Transistor, absolutely
Edge grid bipolar transistor), current sampling unit 501 includes sampling resistor R0, one end of sampling resistor R0 and the transmitting of IGBT
Pole E is connected, and the emitter E ground connection of IGBT, and the other end of sampling resistor R0 is connected with voltage detection unit 502, sampling resistor
The other end of R0 is also connected with the second outfan of filtration module 301.I.e. saying, sampling resistor R0 is connected to filtration module 301
Between second outfan and the emitter E of IGBT.
Specifically, as it is shown on figure 3, voltage detection unit 502 includes: the first resistance R1 and the second resistance R2.
Wherein, one end of the first resistance R1 is connected with the other end of sampling resistor R0；One end and first of second resistance R2
The other end of resistance R1 is connected, and the other end of the second resistance R2 is connected with default power supply VCC, the first resistance R1 and the second resistance R2
Between there is primary nodal point, primary nodal point is in order to output detections signal.
Specifically, the input of current sampling unit 501 is connected with switching tube 80, and current sampling unit 501 sampling is opened
Close the operating current of pipe 80, and current signal is converted into voltage signal；The input of voltage detection unit 502 and current sample
The outfan of unit 501 is connected to receive current sampling signal i.e. voltage signal, and voltage detection unit 502 is for voltage signal
I.e. current sampling signal carries out processing and exports the first voltage signal with the outfan by voltage detection unit 502 and i.e. detect letter
Number.
More specifically, current sampling unit 501 uses small resistor, the negative voltage method of sampling, be converted to bear by forward current
To voltage, and negative current is converted to forward voltage.There is malleation with anti-in the voltage signal of the output of current sampling unit 501
Pressure, and the amplitude of this voltage signal is less, be difficult to sampling, by the conversion of voltage detection unit 502, can be by current sample list
The voltage signal lifting of unit 501 output is forward and the first voltage signal of applicable control circuit 70 sampling.
According to an embodiment of the present utility model, energy consumption circuit 60 includes controllable switch components, gate-controlled switch group
Part is connected in parallel between colelctor electrode and the emitter stage of switching tube 80.
Specifically, controllable switch components includes at least one relay or metal-oxide-semiconductor (Metal-Oxide-
Semiconductor Field-Effect Transistor, metal-oxide layer-quasiconductor-field-effect transistor, is called for short gold oxygen
Half field effect transistor).
It should be noted that at least one relay or metal-oxide-semiconductor can simultaneously turn under the control of control circuit 70 or with
Time turn off, thus ensure the reliability of energy consumption circuit 60, it is achieved the effect of shunting, it is to avoid delayed immediate current is excessive and makes
Controllable switch components is become to damage.
Specifically, as it is shown on figure 3, energy consumption circuit 60 can include the first metal-oxide-semiconductor MOSFET1 and second of parallel connection
Metal-oxide-semiconductor MOSFET2, wherein, the grid of the first metal-oxide-semiconductor MOSFET1 and the grid of the second metal-oxide-semiconductor MOSFET2 are connected, a MOS
There is between grid and the grid of the second metal-oxide-semiconductor MOSFET2 of pipe MOSFET1 fourth node, fourth node and control circuit 70
It is connected；The drain electrode of the first metal-oxide-semiconductor MOSFET1 is connected with the source electrode of the second metal-oxide-semiconductor MOSFET2, the leakage of the first metal-oxide-semiconductor MOSFET1
Having the 5th node between the source electrode of pole and the second metal-oxide-semiconductor MOSFET2, the 5th node is connected with the colelctor electrode of IGBT pipe 80；The
The source electrode of one metal-oxide-semiconductor MOSFET1 and the drain electrode of the second metal-oxide-semiconductor MOSFET2 are connected, the source electrode and second of the first metal-oxide-semiconductor MOSFET1
Having the 6th node between the drain electrode of metal-oxide-semiconductor MOSFET2, the 6th node is connected with the emitter stage of IGBT pipe.
When control circuit 70 exports high level signal, the first metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2 is open-minded,
Electric current flows back to power supply circuits 30 through heating coil L1, resonant capacitance C1 and energy consumption circuit 60, is no longer pass through IGBT pipe
Backward diode, the energy that resonance circuit produces substantially consumes at energy consumption circuit 60 branch road；When control circuit 70 exports
During low level signal, the first metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2 turns off, and electric current is through heating coil L1, resonance electricity
Hold C1 and IGBT pipe flow and return power supply circuits 30, it is not necessary to energy consumption circuit 60 consumes the energy that resonance circuit produces.
So, switching tube to open the most delayed i.e. delayed opening state the most serious, the first metal-oxide-semiconductor MOSFET1 and the 2nd MOS
Pipe MOSFET2 service time is the longest, and the energy that energy consumption circuit 60 consumes is the biggest, the energy of power supply circuits 30 output and energy
Consuming the difference of energy that circuit 60 consumes and be the energy consumed on IGBT pipe, therefore, in various degree delayed opens shape
Under state, the energy consumed on IGBT pipe substantially remains in a less and substantially invariable threshold value.
According to an embodiment of the present utility model, as in figure 2 it is shown, control circuit 70 includes: driver element 701 and control
Chip 702.
Wherein, driver element 701 is connected with energy consumption circuit 60 to drive energy consumption circuit 60 be operated or stop
Only work；The input of control chip 702 is connected with testing circuit 50, the outfan of control chip 702 and driver element 701 phase
Even.
Further, as shown in Figures 2 and 3, control circuit 70 also includes: filter unit 703.Wherein, filter unit 703
Including: the 4th resistance R4 and the 4th electric capacity C4, wherein, between one end and the first resistance R1 and the second resistance R2 of the 4th resistance R4
Primary nodal point be connected；One end of 4th electric capacity C4 is connected with the other end of the 4th resistance R4, another termination of the 4th electric capacity C4
Ground, has secondary nodal point between the 4th resistance R4 and the 4th electric capacity C4, secondary nodal point is connected with control chip 702.
Specifically, as it is shown on figure 3, driver element 701 includes: the first audion Q1, the second audion Q2, the 3rd resistance R3
With stabilivolt ZD1.
Wherein, the colelctor electrode C of the first audion Q1 is connected with default power supply VCC, the emitter E of the first audion Q1 and
The emitter E of two audion Q2 is connected, and base stage B of the first audion Q1 and base stage B of the second audion Q2 are connected, the two or three pole
The colelctor electrode C ground connection of pipe Q2, has second section between emitter E and the emitter E of the second audion Q2 of the first audion Q1
Point, has the 3rd node, wherein, the 3rd node and control between base stage B and base stage B of the second audion Q2 of the first audion Q1
Coremaking sheet 702 is connected；One end of 3rd resistance R3 is connected with secondary nodal point, the other end of the 3rd resistance R3 and controllable switch components
I.e. energy consumption circuit 60 is connected；The negative electrode of stabilivolt ZD1 and the other end of the 3rd resistance R3 are connected, the anode of stabilivolt ZD1
Ground connection.
According to a concrete example of the present utility model, the first audion Q1 can be NPN pipe, and the second audion Q2 can be
PNP pipe.
Specifically, it is defeated by filter unit 703 that the first voltage signal that voltage detection unit 502 exports i.e. detects signal
Entering to control chip 702, the first voltage signal of simulation is transformed to two and enters by the internal A-D converter carried of control chip 702
Data processed, such control chip 702 processes after detection signal is transformed into binary data again.
Control chip 702 can be according to the binary number converted out it is judged that whether the magnitude of voltage of detection signal be more than presetting electricity
Pressure threshold value, if the magnitude of voltage of detection signal is more than predetermined voltage threshold, then the operating current of explanation switching tube 80 is reverse electricity
Stream, switching tube 80 is in delayed opening state, and now control chip 702 controls energy consumption circuit 60 and is operated, and if
The magnitude of voltage of detection signal is less than or equal to predetermined voltage threshold, then explanation switching tube 80 is not in delayed opening state, now
Control chip 702 controls energy consumption circuit 60 and quits work.
Further, the most predeterminable multiple voltage ranges of control chip 702, and the corresponding dutycycle of each voltage range, this
Sample control chip 702 can determine whether to detect the voltage range belonging to magnitude of voltage of signal, and according to belonging to the magnitude of voltage of detection signal
Voltage range export the pwm signal of corresponding dutycycle, thus control switching tube 80 often according to the delay degree of switching tube 80
Service time in individual make and break period, i.e. saying, the delay degree of switching tube 80 is the most serious, and reverse current is the biggest, voltage detecting list
The magnitude of voltage of the detection signal of unit 502 output is the highest, and the dutycycle of the pwm signal of control chip 702 output is the biggest.It addition, should
When being understood by, the pwm signal of control chip 702 output cannot directly drive the high-current switch devices such as metal-oxide-semiconductor, so passes through
Driver element 701 strengthens driving force, and pwm signal output waveform after over-drive unit 701 is identical but load capacity is higher
Pwm signal, to drive being switched on or off of energy consumption circuit 60.
As it has been described above, the work process that the switching tube of this utility model embodiment delayed opens protection device is as follows:
In electromagnetic heating system work process, detect the operating current of switching tube 80 by testing circuit 50 and generate inspection
Surveying signal, the outfan of control chip 702 poll testing circuit 50 is, and control the according to the detection signal of testing circuit 50 output
One metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2, wherein, when switching tube 80 is in delayed opening state, current sample list
Unit 501 will sample moment reverse current, and the magnitude of voltage of the detection signal of voltage detection unit 502 output is more than predeterminated voltage threshold
Value, control chip 702 is after the magnitude of voltage judging detection signal is more than predetermined voltage threshold, it is judged that the magnitude of voltage of detection signal
Affiliated voltage range, and export the pwm signal of dutycycle corresponding to this voltage range, then pwm signal is through over-drive unit
701 drive the first metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2.
If pwm signal is in high level, then the first audion Q1 is open-minded, and the second audion Q2 turns off, driver element 701
Output high level to the first metal-oxide-semiconductor MOSFET1 and the grid of the second metal-oxide-semiconductor MOSFET2, with drive the first metal-oxide-semiconductor MOSFET1 and
Second metal-oxide-semiconductor MOSFET2 is open-minded；If pwm signal is in low level, then the second audion Q2 is open-minded, and the first audion Q1 closes
Disconnected, driver element 701 output low level to the first metal-oxide-semiconductor MOSFET1 and the grid of the second metal-oxide-semiconductor MOSFET2, to drive first
Metal-oxide-semiconductor MOSFET1 and the second metal-oxide-semiconductor MOSFET2 turns off.
Thus, opening under degree in various degree delayed, the energy flowing through IGBT substantially remains in less and substantially permanent
Fixed threshold value.
To sum up, the delayed of the electromagnetic heating system breaker in middle pipe proposed according to this utility model embodiment opens protection dress
Putting, testing circuit generates detection signal according to the operating current of switching tube, and the operating current of energy consumption circuit switch tube enters
Row shunting is to consume the energy that resonance circuit produces, according to detection signal, control circuit judges that switching tube is in delayed opening state
Time control energy consumption circuit be operated, so that the operating current of switching tube is limited in preset range, thus prevent delayed
Under opening state, the biggest electric current breakdown switch pipe, reduces switching tube switching loss, it is ensured that the job stability of system, reduces peace
Full hidden danger, extends the service life of switching tube.
Fig. 4 is the block diagram of the electromagnetic heating system according to this utility model embodiment.As shown in Figure 4, electromagnetism adds
Hot systems 100 includes that the delayed of switching tube opens protection device 40.
The electromagnetic heating system proposed according to this utility model embodiment, delayed by above-mentioned switching tube opens protection
Device, can be limited in the operating current of switching tube in preset range when switching tube is in delayed opening state, thus prevent
Under delayed opening state, the biggest electric current breakdown switch pipe, reduces switching tube switching loss, it is ensured that the job stability of system, fall
Lower security hidden danger, extends the service life of switching tube.
Preferably, electromagnetic heating system 10 can be electromagnetic oven, electromagnetic electric cooker or prevention electromagnetic pressure cooker.
In description of the present utility model, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ", " suitable
Hour hands ", " counterclockwise ", " axially ", " radially ", the orientation of the instruction such as " circumferential " or position relationship be based on orientation shown in the drawings
Or position relationship, be for only for ease of describe this utility model and simplify describe rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
Individual, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.Common skill for this area
For art personnel, above-mentioned term concrete meaning in this utility model can be understood as the case may be.
In this utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score
Can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " permissible
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, this area
Technical staff the feature of the different embodiments described in this specification or example and different embodiment or example can be entered
Row combines and combination.
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
In above-described embodiment can be changed, revise, replace and modification.
Claims (10)
1. the delayed of an electromagnetic heating system breaker in middle pipe opens protection device, it is characterised in that described electromagnetic heating system
Including the resonance circuit being made up of heating coil, resonant capacitance and switching tube and the power supply electricity powered for described resonance circuit
Road, described delayed protection device of opening includes:
Testing circuit, described testing circuit is connected with described switching tube and generates detection letter with the operating current according to described switching tube
Number；
Energy consumption circuit, the operating current of described switching tube is shunted to consume described resonance by described energy consumption circuit
The energy that circuit produces；
Control circuit, described control circuit is respectively connected with described testing circuit and described energy consumption circuit, described control electricity
According to described detection signal, road judges that described switching tube controls described energy consumption circuit and carries out work when being in delayed opening state
Make, be limited in preset range with the operating current by described switching tube.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 1 opens protection device, it is characterised in that institute
State testing circuit to include:
Current sampling unit, described current sampling unit is connected raw with the operating current according to described switching tube with described switching tube
Become current sampling signal；
Voltage detection unit, described voltage detection unit is connected with described current sampling unit with according to described current sampling signal
Generate detection signal.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 2 opens protection device, it is characterised in that institute
Stating switching tube is IGBT, and described current sampling unit includes that sampling resistor, one end of described sampling resistor are sent out with described IGBT's
Emitter-base bandgap grading is connected, and the grounded emitter of described IGBT, and the other end of described sampling resistor is connected with described voltage detection unit.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 3 opens protection device, it is characterised in that institute
State voltage detection unit to include:
First resistance, one end of described first resistance is connected with the other end of described sampling resistor；
Second resistance, one end of described second resistance is connected with the other end of described first resistance, another of described second resistance
End be connected with default power supply, there is between described first resistance and described second resistance primary nodal point, described primary nodal point in order to
Export described detection signal.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 1 opens protection device, it is characterised in that institute
State energy consumption circuit and include that controllable switch components, described controllable switch components are connected in parallel on colelctor electrode and the transmitting of described switching tube
Between pole.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 5 opens protection device, it is characterised in that
Described controllable switch components includes at least one relay or metal-oxide-semiconductor.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 5 opens protection device, it is characterised in that institute
State control circuit to include:
Driver element, described driver element is connected with described energy consumption circuit to drive described energy consumption circuit to be operated
Or quit work；
Control chip, the input of described control chip is connected with described testing circuit, the outfan of described control chip and institute
State driver element to be connected.
The delayed of electromagnetic heating system breaker in middle pipe the most according to claim 7 opens protection device, it is characterised in that institute
State driver element to include:
First audion and the second audion, the colelctor electrode of described first audion is connected with default power supply, described one or three pole
The emitter stage of pipe is connected with the emitter stage of described second audion, the base stage of described first audion and described second audion
Base stage is connected, the grounded collector of described second audion, the emitter stage of described first audion and described second audion
There is between emitter stage secondary nodal point, between base stage and the base stage of described second audion of described first audion, have the 3rd
Node, wherein, described 3rd node is connected with described control chip；
3rd resistance, one end of described 3rd resistance is connected with described secondary nodal point, and the other end of described 3rd resistance is with described
Controllable switch components is connected；
Stabilivolt, the negative electrode of described stabilivolt is connected with the other end of described 3rd resistance, the plus earth of described stabilivolt.
9. an electromagnetic heating system, it is characterised in that include according to the Electromagnetic Heating system according to any one of claim 1-8
System the delayed of breaker in middle pipe opens protection device.
Electromagnetic heating system the most according to claim 9, it is characterised in that described electromagnetic heating system is electromagnetic oven, electricity
Magnetoelectricity pot for cooking rice or prevention electromagnetic pressure cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620486103.8U CN205725688U (en) | 2016-05-24 | 2016-05-24 | Electromagnetic heating system and the delayed of switching tube thereof open protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620486103.8U CN205725688U (en) | 2016-05-24 | 2016-05-24 | Electromagnetic heating system and the delayed of switching tube thereof open protection device |
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| Publication Number | Publication Date |
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| CN205725688U true CN205725688U (en) | 2016-11-23 |
Family
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|---|---|---|---|
| CN201620486103.8U Expired - Fee Related CN205725688U (en) | 2016-05-24 | 2016-05-24 | Electromagnetic heating system and the delayed of switching tube thereof open protection device |
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| CN (1) | CN205725688U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108629396A (en) * | 2018-03-30 | 2018-10-09 | 深圳市远望谷信息技术股份有限公司 | Automatically adjust circuit and electronic label chip that electronic tag receives energy |
| CN108668393A (en) * | 2017-03-29 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control apparatus and method |
| CN108668393B (en) * | 2017-03-29 | 2024-07-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and heating control device and method thereof |
-
2016
- 2016-05-24 CN CN201620486103.8U patent/CN205725688U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668393A (en) * | 2017-03-29 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its heating control apparatus and method |
| CN108668393B (en) * | 2017-03-29 | 2024-07-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and heating control device and method thereof |
| CN108629396A (en) * | 2018-03-30 | 2018-10-09 | 深圳市远望谷信息技术股份有限公司 | Automatically adjust circuit and electronic label chip that electronic tag receives energy |
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Granted publication date: 20161123 Termination date: 20210524 |