CN207135303U - Electromagnetic oven - Google Patents
Electromagnetic oven Download PDFInfo
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- CN207135303U CN207135303U CN201721202399.7U CN201721202399U CN207135303U CN 207135303 U CN207135303 U CN 207135303U CN 201721202399 U CN201721202399 U CN 201721202399U CN 207135303 U CN207135303 U CN 207135303U
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- circuit
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- resistance
- electromagnetic oven
- control chip
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- 239000000956 alloy Substances 0.000 claims abstract description 111
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 110
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 230000003321 amplification Effects 0.000 claims description 34
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 34
- 239000003990 capacitor Substances 0.000 claims description 13
- 229910001006 Constantan Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- HPDFFVBPXCTEDN-UHFFFAOYSA-N copper manganese Chemical compound [Mn].[Cu] HPDFFVBPXCTEDN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 23
- 230000006698 induction Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 16
- 230000008859 change Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
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- Control Of Resistance Heating (AREA)
Abstract
The utility model provides an induction cooker, which comprises a rectifying circuit (10), a heating loop (20), a control chip (30) and an alloy resistor (40), wherein the first end of the alloy resistor (40) is connected with the heating loop (20), and the second end of the alloy resistor (40) is respectively connected with the rectifying circuit (10) and the control chip (30); the control chip (30) is used for detecting the current of the alloy resistor (40). The utility model provides a technical scheme, heating circuit's electric current sampling circuit adopts the alloy resistance as sampling resistance, can reduce cost to reduce electric current sampling circuit's occupation space, consumption and calorific capacity.
Description
Technical field
It the utility model is related to an electro-technical field, more particularly to a kind of electromagnetic oven.
Background technology
Electromagnetic oven is to utilize magnetic force line cutting pan caused by coil panel to produce vortex current, the joule thermal effect of vortex current
Pan should be made to heat up, so as to realize heating.Electromagnetic oven is convenient and swift due to heating, and does not have the advantages that naked light, it has also become people
The very high a kind of cooking apparatus of frequency of use in life.
It is used to realize that the heating circuit of heating generally comprises resonance circuit and insulated gate bipolar transistor in electromagnetic oven
(Insulated Gate Bipolar Transistor, IGBT), electromagnetic oven is by controlling IGBT resonance circuits to shake
Swing, so that forming the electric current of high frequency change on the coil panel in resonance circuit, and then produce magnetic field, pass through the magnetic line of force in magnetic field
Cutting pan realizes Electromagnetic Heating (Induction Heating, IH).And in current IH systems, power tube IGBT easily exists
Damaged in the case of excessively stream, therefore electromagnetic oven on the market typically all has current sampling circuit, is supervised by current sampling circuit
Control the situation of change of the electric current in IH device operations.At present, conventional current sampling circuit mainly has transformer current to adopt
Sample circuit and metalfilmresistor pressure sampling circuit.
But transformer current sample circuit needs to be sampled using transformer, thus cost is larger；Metalfilmresistor
Pressure sampling circuit needs to be sampled using multiple resistance, thus the space taken is big, and circuit power consumption and caloric value also compare
Greatly.
Utility model content
In view of this, the utility model provides a kind of electromagnetic oven, for reducing cost, and reduces accounting for for current sampling circuit
With space, power consumption and caloric value.
To achieve these goals, the utility model embodiment provides a kind of electromagnetic oven, includes the rectified current of interconnection
Road, heating circuit and control chip, in addition to：Resistance alloys, the first end of resistance alloys are connected with heating circuit, resistance alloys
The second end be connected respectively with rectification circuit and control chip；Control chip is used for the electric current for detecting resistance alloys.
By connecting resistance alloys between rectification circuit and heating circuit, wherein, the first end of resistance alloys and heating
Loop is connected, and the second end of resistance alloys is connected with rectification circuit and control chip respectively；Control chip is used to detect alloy electricity
The electric current of resistance, so as to pass through resistance alloys from the electric current of heating circuit outflow, control chip is by detecting the electricity of resistance alloys
Stream can detect that the electric current of heating circuit；I.e. the current sampling circuit of heating circuit using resistance alloys as sampling resistor,
Thus cost is low, and need not use other electric resistance partial pressures, and circuit is less, and the space of occupancy is smaller, at the same circuit power consumption with
Caloric value is also smaller；In addition, resistance alloys varies with temperature change in resistance very little, sampling stability is high.
As a kind of optional embodiment of the utility model embodiment, electromagnetic oven also includes signal amplification circuit, signal
Amplifying circuit is connected with resistance alloys and the control chip respectively, and signal amplification circuit is used for the ohmically electric signal of alloy
It is amplified.
By setting signal amplifying circuit, the ohmically electric signal of alloy can be amplified, improve current sample
Accuracy.
As a kind of optional embodiment of the utility model embodiment, signal amplification circuit includes：Operational amplifier and
First resistor, the inverting input of operational amplifier and the second end of resistance alloys connect, the in-phase input end of operational amplifier
Ground connection, the output end of operational amplifier and the digital-to-analogue conversion AD ports of control chip connect；Put with computing one end of first resistor
The inverting input connection of big device, the other end of first resistor and the output end of operational amplifier connect.
Pass through the outside scope of application that independent signal amplification circuit is set, circuit can be improved in control chip.
As a kind of optional embodiment of the utility model embodiment, the both ends of first resistor are parallel with filter capacitor.
By the both ends parallel filtering electric capacity in first resistor, the electric current of operational amplifier can be entered by filter capacitor
Row filtering, the current potential of stable operational amplifier output terminal.
As a kind of optional embodiment of the utility model embodiment, signal amplification circuit is integrated in control chip.
By the way that signal amplification circuit is integrated in control chip, circuit level can be improved, circuit is saved and takes sky
Between.
As a kind of optional embodiment of the utility model embodiment, the both ends of resistance alloys are parallel with filter capacitor.
, can be by filter capacitor to the ohmically electric signal of alloy by the both ends parallel filtering electric capacity in resistance alloys
It is filtered, the current potential at stable alloy resistance both ends.
As a kind of optional embodiment of the utility model embodiment, connected between resistance alloys and signal amplification circuit
There is second resistance.
, can be to flowing to signal from resistance alloys by connecting second resistance between resistance alloys and signal amplification circuit
The electric current of amplifying circuit carries out current limliting, improves the security of circuit.
As a kind of optional embodiment of the utility model embodiment, resistance alloys is connected on rectification circuit and heated back
On live wire or zero line between road.
As a kind of optional embodiment of the utility model embodiment, resistance alloys is constantan wire or manganese-copper filament.
As a kind of optional embodiment of the utility model embodiment, heating circuit includes：Resonance circuit and insulated gate
Bipolar transistor IGBT, IGBT are connected in parallel on the DC output end of rectification circuit, and resonance circuit is connected on rectification circuit and IGBT
Between, IGBT is connected by IGBT drive circuit with control chip.
By using resonance circuit and IGBT as heating circuit, wherein, IGBT is connected in parallel on the direct current output of rectification circuit
End, resonance circuit are connected between rectification circuit and IGBT, and IGBT is connected by IGBT drive circuit with control chip, so as to control
Coremaking piece can control IGBT break-make by IGBT drive circuit so that resonance circuit vibrates, and converts electrical energy into magnetic
Field energy, realize Electromagnetic Heating.
Construction of the present utility model and its other purpose of utility model and beneficial effect will be in conjunction with the accompanying drawings
Description of preferred embodiments and it is more obvious understandable.
Brief description of the drawings
Fig. 1 is the illustrative view of functional configuration for the electromagnetic oven that the utility model embodiment provides；
Fig. 2 is the circuit structure schematic diagram for the electromagnetic oven that the utility model embodiment provides.
Description of reference numerals：
10- rectification circuits；
20- heating circuits；
30- control chips；
40- resistance alloys；
50- signal amplification circuits；
60-IGBT drive circuits；
21- resonance circuits；
22-IGBT。
Embodiment
Compare to solve the big space that existing current sampling circuit cost is larger, takes, circuit power consumption and caloric value
Big technical problem, the utility model embodiment provide a kind of electromagnetic oven, mainly by rectification circuit and heating circuit it
Between connect a resistance alloys, the electric current of resistance alloys is detected by control chip to realize the current detecting of heating circuit；Adopt
Sampling resistor in by the use of resistance alloys as the current sampling circuit of heating circuit, to reduce the occupancy of current sampling circuit sky
Between, power consumption and caloric value.
Describe the technical solution of the utility model in detail below in conjunction with the accompanying drawings.
Fig. 1 is the illustrative view of functional configuration for the electromagnetic oven that the utility model embodiment provides, and Fig. 2 is implemented for the utility model
The circuit structure schematic diagram for the electromagnetic oven that example provides.As depicted in figs. 1 and 2, the electromagnetic oven that the present embodiment provides includes mutually being connected
Rectification circuit 10, heating circuit 20 and the control chip 30 connect, in addition to：Resistance alloys 40, the first end of resistance alloys 40 with
Heating circuit 20 is connected, and the second end of resistance alloys 40 is connected with rectification circuit 10 and control chip 30 respectively；Control chip 30
For detecting the electric current of resistance alloys 40.
Specifically, electromagnetic oven, in heating process, electric current flows to rectification circuit 10 from heating circuit 20；Resistance alloys 40 connects
It is connected between rectification circuit 10 and heating circuit 20, the electric current flowed out from heating circuit 20 can pass through resistance alloys 40, so as to logical
The electric current for crossing detection resistance alloys 40 can detect that the electric current of heating circuit 20.I.e. in the present embodiment, the electricity of heating circuit 20
Stream sample circuit is used as sampling resistor using resistance alloys 40, relatively low compared to transformer, cost；And multiple electricity need not be used
Partial pressure is hindered, circuit is less, and the space of occupancy is smaller, while circuit power consumption and caloric value are also smaller；In addition, resistance alloys 40
Change in resistance very little is varied with temperature, sampling stability is high.
In specific implementation, resistance alloys 40 can be the resistance alloys made of alloy material such as constantan wire or manganese-copper filament
Silk, resistance alloys 40 can specifically be formed by 1 or more alloy resistance wires parallel connections.
Resistance alloys 40 can be connected on the live wire or zero line between rectification circuit 10 and heating circuit 20, Fig. 2 be with
Resistance alloys 40 is illustrative exemplified by being connected on the zero line between rectification circuit 10 and heating circuit 20.
Resistance alloys 40 is used as sampling resistor, can select less resistance, while sampling is realized, reduces energy as far as possible
Consumption.
Rectification circuit 10 connects the live wire and zero line of civil power, for mains electricity to be converted into direct current.Rectification circuit
10 can be bridge rectifier, and bridge rectifier is typically that rectifying tube is enclosed in a housing, is divided into full-bridge and half-bridge；
Four diodes of the bridge rectifier that full-bridge refers to connect are enclosed in together；Half-bridge refers to four diode bridges are whole
The half of stream is enclosed in together, and a full-bridge can be formed with two half-bridges.The particular circuit configurations of rectification circuit 10 can use existing
Rectification circuit in some electromagnetic ovens, the present embodiment are not specially limited to this.
Heating circuit 20 includes resonance circuit 21 and IGBT22, IGBT22 are connected in parallel on the DC output end of rectification circuit 10,
Resonance circuit 21 is connected between rectification circuit 10 and IGBT22, and IGBT22 is connected by IGBT drive circuit 60 and control chip 30
Connect.Resonance circuit 21 can be realized by the coil panel and electric capacity of parallel connection.
Wherein, control chip 30 can send IGBT control signals to IGBT drive circuit 60, pass through IGBT drive circuit
60 control IGBT22 turn-on and turn-off；IGBT22 high frequency break-make can cause resonance circuit 21 to vibrate, i.e. resonance electricity
The mutual discharge and recharge of coil panel and electric capacity in road 21, so as to which the electricity of high frequency change can be formed on the coil panel in resonance circuit 21
Stream, the electric current of high frequency change flow through the magnetic field that coil panel produces high frequency change；When being placed with pan on electromagnetic oven, in magnetic field
Magnetic force line cutting pan can produce vortex current, and the joule heating effect of vortex current can make pan voluntarily heat up, Ran Houzai
The food in pan is heated, realizes Electromagnetic Heating.
In specific implementation, resonance circuit 21 can be connected on the live wire between rectification circuit 10 and IGBT22, also may be used
To be connected on the zero line between rectification circuit 10 and IGBT22.IGBT22 colelctor electrode is connected with resonance circuit 21, IGBT22
Emitter stage be connected by resistance alloys 40 with rectification circuit 10, IGBT22 base stage passes through IGBT drive circuit 60 and control core
Piece 30 connects.
Resistance alloys 40 is connected to from resonance circuit 21 on different branch roads, i.e., can be by resonance circuit 21 in connection
It is connected on the live wire between rectification circuit 10 and IGBT22, resistance alloys 40 is connected between rectification circuit 10 and IGBT22
Zero line on；Or resonance circuit 21 is connected on the zero line between rectification circuit 10 and IGBT22, resistance alloys 40 is gone here and there
It is associated on the live wire between rectification circuit 10 and IGBT22.The specific electricity of resonance circuit 21, IGBT22 and IGBT drive circuit 60
Line structure can use the corresponding circuits structure in existing electromagnetic oven, and the present embodiment is not particularly limited.
Control chip 30 to the IGBT control signals that IGBT drive circuit 60 is sent can be high level signal or low electricity
Ordinary mail number, the present embodiment are not specially limited to this.
In addition, filter circuit can also be connected between heating circuit 20 and rectification circuit 10, by filter circuit to rectification
The direct current that circuit 10 exports is filtered；Resistance alloys 40 specifically can be between filter circuit and resonance circuit 21.Filter
The particular circuit configurations of wave circuit can also use the corresponding circuits structure in existing electromagnetic oven, and the present embodiment does not do special limit
System.Such as：Filter circuit can specifically use filter capacitor to realize, filter capacitor is connected in parallel on the direct current output of rectification circuit 10
End.
In addition, can be control by switching power circuit with connecting valve power circuit between civil power and control chip
The light current such as chip, IGBT drive circuit device provides power supply.In specific implementation, switching power circuit can have rectification, filter
The functions such as ripple, voltage transformation, when the alternating current of city's electricity output passes through switching power circuit, switching power circuit will can exchange
Electricity is converted to direct current, and carries out smothing filtering to electric current, then high voltage direct current is converted to the low pressure of light current device needs
Direct current, powered for light current device.
Moreover, Electro Magnetic Compatibility filter circuit can also be connected between civil power and rectification circuit 10, switching power circuit, with
Filter out the electromagnetic interference between civil power and rectification circuit 10 and between civil power and switching power circuit.
It should be noted that the concrete structure of control chip can be the control structure in existing electromagnetic oven, this implementation
Example is not specially limited to this.
In addition, the present embodiment does not limit for other also included circuits or element in electromagnetic oven, can be according to need
It is configured.
In the present embodiment, the operation principle of current sample is specially：When electromagnetic oven works, electric current flows to from heating circuit 20
Resistance alloys 40, when electric current flows through resistance alloys 40, the both ends of resistance alloys 40 will produce a voltage difference, and control chip 30 will
The voltage difference divided by the resistance value of resistance alloys 40 can draw the electric current for flowing through resistance alloys 40, namely the electricity of heating circuit 20
Stream.After control chip 30 calculates the electric current, it is possible to IGBT22 break-make is controlled according to the size of electric current, such as：In electric current
During threshold current more than IGBT22, control IGBT22 disconnects, to avoid IGBT22 from being damaged in the case of excessively stream.Wherein, should
Threshold current is less than IGBT22 maximum safe operating current, is arranged as required to when specifically chosen, the present embodiment is not done especially
Limit.
Resistance alloys 40 is used as sampling resistor, and resistance value is typically smaller, and the electric current exported from heating circuit 20 flows through conjunction
Voltage difference caused by golden resistance 40 is also smaller, in order to be amplified to the voltage difference, to improve the accuracy of current sample,
In the present embodiment, electromagnetic oven can also include signal amplification circuit 50, signal amplification circuit 50 respectively with resistance alloys 40 and control
Coremaking piece 30 connects, and signal amplification circuit 50 is used to be amplified the electric signal on resistance alloys 40.
Specifically, signal amplification circuit 50 can use operational amplifier or comparator to realize, such as：Computing can be used
Amplifier, a resistance (first resistor) in parallel is used as feedback resistance between the input of operational amplifier and output end, simultaneously
Can also between the input of operational amplifier and output end an in parallel filter capacitor, the electric current of operational amplifier is filtered
Ripple, the current potential of stable operational amplifier output terminal, to realize signal amplification circuit 50.
Signal amplification circuit 50 can be independently arranged with control chip 30, can also be integrated in control chip 30.Having
When body is realized, if control chip 30 has been internally integrated signal amplification circuit 50, the second end of resistance alloys 40 can directly with control
The pin corresponding with signal amplification circuit 50 connection on coremaking piece 30；If non-integrated signal amplifying circuit in control chip 30
50, resistance alloys 40 can be connected to the digital-to-analogue conversion (Analog-to- of control chip 30 by signal amplification circuit 50
Digital converter, AD) port.
If the circuit independent as one of signal amplification circuit 50, the use range of circuit can be improved；Signal amplification electricity
If road 50 is integrated in control chip 30, circuit level can be improved, saves circuit footprint.
When carrying out current sample, the electric signal (i.e. voltage signal) on resistance alloys 40 passes through the quilt of signal amplification circuit 50
Signal amplification circuit 50 amplifies, and the voltage that control chip 30 exports according to signal amplification circuit 50 is converted, it can be deduced that closes
Magnitude of voltage on golden resistance 40, the magnitude of voltage of resistance alloys 40 divided by the resistance value of resistance alloys 40, which can be drawn, flows through alloy electricity
The electric current of resistance 40, namely the electric current of heating circuit 20；After control chip 30 calculates the electric current, it is possible to be more than in electric current
During IGBT22 threshold current, control IGBT22 disconnects, to avoid IGBT22 from being damaged in the case of excessively stream.
, can be in parallel at the both ends of resistance alloys 40 in the present embodiment in order to further improve the accuracy of current sample
Filter capacitor, the electric signal on resistance alloys 40 is filtered by filter capacitor, the current potential at the both ends of stable alloy resistance 40.
In addition, a resistance (the second electricity can be connected in the present embodiment, between resistance alloys 40 and signal amplification circuit 50
Resistance), to carry out current limliting to the electric current that signal amplification circuit 50 is flowed to from resistance alloys 40, improve the security of circuit.This second
Resistance can select larger resistance, preferably to realize the current limliting to circuit.
Describe the particular circuit configurations of the present embodiment in detail with reference to Fig. 2.
As shown in Fig. 2 rectification circuit 10 is bridge rectifier (BG1), two exchanges of rectification circuit 10 (BG1)
(alternating current, AC) end (port 2,3) connects the live wire L and zero line N of civil power, rectification circuit 10 (BG1) respectively
Two DC output ends (port 1,4) connection heating circuit 20.
The direct current that heating circuit 20 is connected in parallel on rectification circuit 10 (BG1) including resonance circuit 21 and IGBT22, IGBT22 is defeated
Go out end, resonance circuit 21 is connected on rectification circuit 10 (BG1) on the zero line between IGBT22, and resistance alloys 40 (RK) is connected on
On live wire between IGBT22, IGBT22 is connected rectification circuit 10 (BG1) by IGBT drive circuit 60 with control chip 30.
Specifically, one end of resonance circuit 21 is connected with the port 1 of rectification circuit 10 (BG1), resonance circuit 21 it is another
End is connected with IGBT22 colelctor electrode；IGBT22 emitter stage is connected with the first end (connection end 1) of resistance alloys 40 (RK), is closed
The second end (connection end 2) of golden resistance 40 (RK) is connected with the port 4 of rectification circuit 10 (BG1)；IGBT drive circuit 60 it is defeated
Enter end to be connected with control chip 30, the output end of IGBT drive circuit 60 and IGBT22 base stage connect.Resonance circuit 21 includes
Coil panel L and electric capacity C3, electric capacity C3 are connected in parallel on coil panel L both ends.
In addition, first end (connection end 1) ground connection of resistance alloys 40 (RK), the second end (connection of resistance alloys 40 (RK)
One end 2) with second resistance R2 is held to be connected.The both ends parallel filtering electric capacity C1 of resistance alloys 40 (RK).
Signal amplification circuit 50 includes：Operational amplifier OPA and first resistor R1, operational amplifier OPA anti-phase input
End 2 is connected with the second resistance R2 other end and (is connected by second resistance R2 with the second end of resistance alloys 40 (RK)), transports
The in-phase input end 3 for calculating amplifier OPA is grounded, and operational amplifier OPA output end 1 is connected with the AD ports of control chip 30；
First resistor R1 one end is connected with operational amplifier OPA inverting input 2, first resistor the R1 other end and operation amplifier
Device OPA output end 1 connects.First resistor R1 both ends parallel filtering electric capacity C2.
In the course of the work, control chip 30 sends IGBT control signals to electromagnetic oven to IGBT drive circuit 60, passes through
IGBT drive circuit 60 drives IGBT22 turn-on and turn-off, and IGBT22 vibrates resonance circuit 21, in resonance circuit 21
Coil panel and the mutual discharge and recharge of electric capacity so that form the electric current of high frequency change on coil panel in resonance circuit 21, and then
The magnetic line of force is produced, realizes Electromagnetic Heating.
The electric current flowed out from IGBT22 emitter stage passes through resistance alloys 40 (RK), and the both ends of resistance alloys 40 (RK) produce
One voltage difference, the voltage signal on resistance alloys 40 (RK) are amplified after operational amplifier OPA by operational amplifier OPA, control
Coremaking piece 30 is calculated according to the operational amplifier OPA voltages exported, it can be deduced that the magnitude of voltage on resistance alloys 40 (RK),
The resistance value of the voltage difference divided by resistance alloys 40 (RK) is then drawn to the electric current for flowing through resistance alloys 40 (RK), namely heating
The electric current in loop 20., can be when electric current be more than IGBT22 threshold current after control chip 30 calculates the electric current, control
IGBT22 disconnects, to avoid IGBT22 from being damaged in the case of excessively stream.
Wherein, electric current simultaneously flows through filter capacitor from during IGBT22 emitter stage flows through resistance alloys 40 (RK)
C1, so as to which filter capacitor C1 is filtered to the electric current of resistance alloys 40 (RK), the current potential at stable alloy resistance 40 (RK) both ends.
Electric current is from during resistance alloys 40 (RK) flows to signal amplification circuit 50, and by second resistance such as, electric current becomes
It is small, realize and current limliting is carried out to the electric current that signal amplification circuit 50 is flowed to from resistance alloys 40 (RK).
In addition, during electric current such as flows through operational amplifier OPA from second resistance, while electric capacity C2 after filtering, from
And filter capacitor C2 is filtered to operational amplifier OPA electric current, the current potential of stable operational amplifier OPA output ends.
The electromagnetic oven that the present embodiment provides, connects resistance alloys between rectification circuit and heating circuit, wherein, resistance alloys
First end be connected with heating circuit, the second end of resistance alloys is connected with rectification circuit and control chip respectively；Control chip
For detecting the electric current of resistance alloys, so as to pass through resistance alloys from the electric current of heating circuit outflow, control chip passes through inspection
The electric current for surveying resistance alloys is the electric current that can detect that heating circuit；The electricity of heating circuit in the electromagnetic oven that i.e. the present embodiment provides
Flow sample circuit using resistance alloys as sampling resistor, thus cost is low, and need not use other electric resistance partial pressures, circuit compared with
Few, the space of occupancy is smaller, while circuit power consumption and caloric value are also smaller；In addition, resistance alloys varies with temperature resistance
Vary less, sampling stability is high.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that instruction or hint relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".
In addition, in the utility model, unless otherwise clearly defined and limited, term " connection ", " connected " etc. should be done
It broadly understood, such as can be mechanical connection or electrical connection；Can be directly connected to, intermediary can also be passed through
Be indirectly connected, can be connection or the interaction relationship of two elements of two element internals, unless otherwise it is clear and definite limit,
For the ordinary skill in the art, it can understand that above-mentioned term is in the utility model specific as the case may be
Implication.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of electromagnetic oven, including the rectification circuit (10) of interconnection, heating circuit (20) and control chip (30), its feature
It is, in addition to：Resistance alloys (40), the first end of the resistance alloys (40) is connected with the heating circuit (20), described
Second end of resistance alloys (40) is connected with the rectification circuit (10) and the control chip (30) respectively；The control chip
(30) it is used for the electric current for detecting the resistance alloys (40).
2. electromagnetic oven according to claim 1, it is characterised in that the electromagnetic oven also includes signal amplification circuit (50),
The signal amplification circuit (50) is connected with the resistance alloys (40) and the control chip (30) respectively, the signal amplification
Circuit (50) is used to be amplified the electric signal on the resistance alloys (40).
3. electromagnetic oven according to claim 2, it is characterised in that the signal amplification circuit (50) includes：Operation amplifier
Device and first resistor, the inverting input of the operational amplifier are connected with the second end of the resistance alloys (40), the fortune
Calculate the in-phase input end ground connection of amplifier, the output end of the operational amplifier and the digital-to-analogue conversion AD of the control chip (30)
Port connects；One end of the first resistor is connected with the inverting input of the operational amplifier, the first resistor it is another
One end is connected with the output end of the operational amplifier.
4. electromagnetic oven according to claim 3, it is characterised in that the both ends of the first resistor are parallel with filter capacitor.
5. electromagnetic oven according to claim 2, it is characterised in that the signal amplification circuit (50) is integrated in the control
In chip (30).
6. electromagnetic oven according to claim 1, it is characterised in that the both ends of the resistance alloys (40) are parallel with filtered electrical
Hold.
7. electromagnetic oven according to claim 2, it is characterised in that the resistance alloys (40) and the signal amplification circuit
(50) second resistance is connected between.
8. electromagnetic oven according to claim 1, it is characterised in that the resistance alloys (40) is connected on the rectification circuit
(10) on the live wire or zero line between the heating circuit (20).
9. electromagnetic oven according to claim 1, it is characterised in that the resistance alloys (40) is constantan wire or manganese-copper filament.
10. electromagnetic oven according to claim 1, it is characterised in that the heating circuit (20) includes：Resonance circuit (21)
With insulated gate bipolar transistor IGBT (22), the IGBT (22) is connected in parallel on the DC output end of the rectification circuit (10),
The resonance circuit (21) is connected between the rectification circuit (10) and the IGBT (22), and the IGBT (22) passes through IGBT
Drive circuit (60) is connected with the control chip (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721202399.7U CN207135303U (en) | 2017-09-19 | 2017-09-19 | Electromagnetic oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721202399.7U CN207135303U (en) | 2017-09-19 | 2017-09-19 | Electromagnetic oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207135303U true CN207135303U (en) | 2018-03-23 |
Family
ID=61638930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721202399.7U Expired - Fee Related CN207135303U (en) | 2017-09-19 | 2017-09-19 | Electromagnetic oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207135303U (en) |
-
2017
- 2017-09-19 CN CN201721202399.7U patent/CN207135303U/en not_active Expired - Fee Related
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Granted publication date: 20180323 |