CN209448919U - Electromagnetic heating system and its current detection circuit and electric cooking pot - Google Patents
Electromagnetic heating system and its current detection circuit and electric cooking pot Download PDFInfo
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- CN209448919U CN209448919U CN201822269741.6U CN201822269741U CN209448919U CN 209448919 U CN209448919 U CN 209448919U CN 201822269741 U CN201822269741 U CN 201822269741U CN 209448919 U CN209448919 U CN 209448919U
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Abstract
The utility model discloses a kind of electromagnetic heating system and its current detection circuits and electric cooking pot, wherein, electromagnetic heating system includes resonant heating circuit, resonant heating circuit includes resonant capacitance and resonant inductance, one end of resonant capacitance is connected with one end of resonant inductance, current detection circuit includes: power supply circuit, and power supply circuit is used to power to current detection circuit；Current transformer, one end of the secondary coil of current transformer is connected with power supply circuit, the other end of secondary coil is connected with controller, and one end of the primary coil of current transformer is connected with the other end of resonant inductance, and the other end of primary coil is connected with the other end of resonant capacitance.The current detection circuit of the electromagnetic heating system is flowed through the electric current of resonant inductance by current transformer detection, avoids extraneous interference, and improve the accuracy of detection.
Description
Technical field
The utility model relates to technical field of electric appliances more particularly to a kind of current detection circuits of electromagnetic heating system, one
Kind electromagnetic heating system and a kind of electric cooking pot.
Background technique
Electric current currently, electric cooking pot, such as when electromagnetic oven works is detected by a constantan wire i.e. detection resistance
, electric current flows through constantan wire and generates pressure drop, that is, converts the current to voltage to detect and acquire.However, above-mentioned technical proposal, though
So there is advantage at low cost, but its electric current detected can accurately not feed back the actual current of coil disc of electric stove, and
And it detects signal and is also easy to by external interference, such as the interference of clutter.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of current detection circuit of electromagnetic heating system, the electric current of the electromagnetic heating system with first novel purpose
Detection circuit is flowed through the electric current of resonant inductance by current transformer detection, avoids extraneous interference, and improve detection
Accuracy.
Second purpose of the utility model is to propose a kind of electromagnetic heating system.
The third purpose of the utility model is to propose a kind of electric cooking pot.
To achieve the above object, the utility model first aspect proposes a kind of current detecting electricity of electromagnetic heating system
Road, the electromagnetic heating system include resonant heating circuit, and the resonant heating circuit includes resonant capacitance and resonant inductance, institute
The one end for stating resonant capacitance is connected with one end of the resonant inductance, and the current detection circuit includes: power supply circuit, the confession
Circuit is used to power to the current detection circuit；Current transformer, one end of the secondary coil of the current transformer with
The power supply circuit is connected, and the other end of the secondary coil is connected with controller, the primary coil of the current transformer
One end is connected with the other end of the resonant inductance, the other end phase of the other end of the primary coil and the resonant capacitance
Even.
The current detection circuit of electromagnetic heating system according to the present utility model flows through resonance by current transformer detection
The electric current of inductance avoids extraneous interference, and improves the accuracy of detection.
In addition, according to the utility model proposes electromagnetic heating system current detection circuit can also have it is following additional
Technical characteristic:
In some instances, the current detection circuit of electromagnetic heating system further include: the first filter circuit, first filter
Wave circuit is connected between the power supply circuit and the secondary coil.
In some instances, the power supply circuit includes: default power supply；First resistor, one end of the first resistor with
The default power supply is connected, and the other end of the first resistor is connected with one end of the secondary coil, and forms first node；
Second resistance, one end of the second resistance are connected with the first node, the other end ground connection of the second resistance.
In some instances, first filter circuit includes: the first filter capacitor, one end of first filter capacitor
It is connected with the first node, the other end of first filter capacitor is connected with the other end of the secondary coil；Damping electricity
Resistance, the damping resistance are connected in parallel with first filter capacitor.
In some instances, the power supply circuit is also connected with the controller, to power to the controller.
To achieve the above object, the utility model second aspect proposes a kind of electromagnetic heating system, the electromagnetic heating system
System includes: resonant heating circuit, and the resonant heating circuit includes resonant capacitance and resonant inductance, one end of the resonant capacitance
It is connected with one end of the resonant inductance；The input terminal of rectification circuit, the rectification circuit is connected with AC power source, the rectification
Circuit is used to receive the alternating current of the AC power source output, and carries out rectification processing to the alternating current with output ripple direct current
Electricity；The input terminal of second filter circuit, second filter circuit is connected with the output end of the rectification circuit, second filter
The output end of wave circuit is connected with the resonant heating circuit, and second filter circuit is used to carry out the Rectified alternating current
Filtering processing, and Rectified alternating current is supplied to the resonant heating circuit by treated；The utility model first aspect proposes
Current detection circuit.
Electromagnetic heating system according to the present utility model, it is electric to resonance is flowed through by the current detection circuit of the utility model
The electric current of sense is detected, and avoids extraneous interference, and improve the accuracy of detection.
In addition, according to the utility model proposes electromagnetic heating system can also have the following additional technical features:
In some instances, electromagnetic heating system further include: EMC protection circuitry, the EMC protection circuitry are connected to described
Between AC power source and the rectification circuit.
To achieve the above object, the utility model third aspect proposes a kind of electric cooking pot, which includes this
The electromagnetic heating system that utility model second aspect proposes.
Electricity cooking pot according to the present utility model, electromagnetic heating system using the utility model is to flowing through resonant inductance
Electric current is detected, and be can be avoided extraneous interference, is improved the accuracy of detection.
The additional aspect of the utility model and advantage will be set forth in part in the description, partially will be from following description
In become obvious, or recognized by the practice of the utility model.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to the current detection circuit of the electromagnetic heating system of the utility model embodiment；
Fig. 2 is the structural schematic diagram according to the current detection circuit of one exemplary electromagnetic heating system of the utility model；
Fig. 3 is the waveform diagram according to one exemplary sampled voltage of the utility model；
Fig. 4 is the structural schematic diagram according to one exemplary electromagnetic heating system of the utility model；
Fig. 5 is the structural block diagram according to the electric cooking pot of the utility model embodiment.
Specific embodiment
The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model
Limitation.
Below with reference to the accompanying drawings the electromagnetic heating system and its current detection circuit and electricity for describing the utility model embodiment are cooked
It prepares food device.
Fig. 1 is the structural schematic diagram according to the current detection circuit of the electromagnetic heating system of the utility model embodiment.
As shown in Figure 1, the electromagnetic heating system of the utility model embodiment includes resonant heating circuit 10, resonance heating electricity
Road 10 includes resonant capacitance C2 and resonant inductance L2, and one end of resonant capacitance C2 is connected with one end of resonant inductance L2, electric current inspection
Slowdown monitoring circuit 40 includes: power supply circuit 41 and current transformer L3.
Wherein, power supply circuit 41 is used to power to current detection circuit 40；One end of the secondary coil of current transformer L3
It is connected with power supply circuit 41, the other end of secondary coil is connected with controller 2, is sent to controller 2 with the electric current that will test, electricity
One end of the primary coil of current transformer L3 is connected with the other end of resonant inductance L2, the other end and resonant capacitance of primary coil
The other end of C2 is connected.
Optionally, referring to Fig.1, resonant inductance L2 can be the coil panel of electromagnetic oven, and on the coil panel and electromagnetic oven
Cookware can form a transformer, and coil panel is the primary of transformer, and cookware is the secondary of transformer.When coil panel has alternation
Inevitable to generate induced current on secondary cookware after voltage output, which passes through the resistance heating of cookware itself, generates
Heat achievees the purpose that heating.
In the embodiments of the present invention, power supply circuit 41 can also be connected with controller 2, to power to controller 2.
In an example of the utility model, as shown in Fig. 2, the current detection circuit 40 of electromagnetic heating system can also wrap
The first filter circuit 42 is included, the first filter circuit 42 is connected between power supply circuit 41 and the secondary coil of current transformer L3.
Further, referring to Fig. 2, power supply circuit 41 can include: default power supply VCC, first resistor R1 and second resistance R2.
Wherein, one end of first resistor R1 is connected with default power supply VCC, the other end and current transformer of first resistor R1
One end of the secondary coil of L3 is connected, and forms first node a；One end of second resistance R2 is connected with first node a, the second electricity
The other end for hindering R2 is grounded GND.
Referring to Fig. 2, the first filter circuit 42 includes: the first filter capacitor C3 and damping resistance R3.
Wherein, one end of the first filter capacitor C3 is connected with first node a, the other end and electric current of the first filter capacitor C3
The other end of the secondary coil of mutual inductor L3 is connected；Damping resistance R3 is connected in parallel with the first filter capacitor C3.
Specifically, power supply circuit 41 gives current transformer L3, the first filter circuit 42 and controller by taking electromagnetic oven as an example
2 power supplies, the electric current when electromagnetic oven that current transformer L3 can will test works, are converted to sampled voltage, the sampled voltage
It is exported after the filtering processing of the first filter circuit 42 to the AD sample port of controller 2.Due to the middle electrocardio of sampled voltage
Pressing (i.e. the voltage of first node a in Fig. 2) is Vin=[R2/ (R1+R2)] * VCC, is adopted in sampled voltage by the AD of controller 2
When sample port, the entire waveform of sampled voltage can be detected completely, as shown in Figure 3.
Influence of the external disturbance to sampled signal is reduced as a result, improves the accuracy of sampling, meanwhile, it is capable to realize pair
The real-time sampling of coil disc of electric stove electric current, and then improve the accuracy of control.
Based on the above embodiment, the utility model proposes a kind of electromagnetic heating systems, as shown in figure 4, the utility model
The electromagnetic heating system 100 of embodiment includes: resonant heating circuit 10, rectification circuit 20, the second filter circuit 30 and above-mentioned reality
Apply the current detection circuit 40 of example.
Wherein, resonant heating circuit 10 includes resonant capacitance C2 and resonant inductance L2, one end of resonant capacitance C2 and resonance
One end of inductance L2 is connected；The input terminal of rectification circuit 20 is connected with AC power source 1, and rectification circuit 20 is for receiving AC power source
The alternating current of 1 output, and rectification processing is carried out with output ripple direct current to alternating current；The input terminal of second filter circuit 30 with
First output end of rectification circuit 20 is connected, and the output end of the second filter circuit 30 is connected with resonant heating circuit 10, the second filter
For being filtered to Rectified alternating current, and by treated, Rectified alternating current is supplied to resonant heating circuit to wave circuit 30
10。
Optionally, AC power source 1 can be utility grid, and rectification circuit 20 can be by four diode VD1-VD4 connections
The rectifier bridge of composition.
In an example of the utility model, referring to Fig. 4, electromagnetic heating system 100 further includes EMC (Electro
Magnetic Compatibility, Electro Magnetic Compatibility) protection circuit 50, EMC protection circuitry 50 be connected to AC power source 1 with it is whole
Between current circuit 20.
In this example, the effect of EMC protection circuitry 50, which can be, inhibits external interference signals to enter electricity by utility grid
Thus magnetic heating system avoids extraneous interference.
Referring to Fig. 4, the second filter circuit 30 includes: filter inductance L1 and the second filter capacitor C1.
Wherein, one end of filter inductance L1 is connected with the first output end of rectification circuit 20, the other end of filter inductance L1
It is connected respectively with one end of one end of resonant inductance L2 and resonant capacitance C2, and forms second node b；Second filter capacitor C1's
One end is connected with second node b, and the other end of the second filter capacitor C1 is connected with the second output terminal of rectification circuit 20, and is grounded
GND。
In the present invention, the first output end of rectification circuit 20 can be anode, and second output terminal can be cathode.
In this example, referring to Fig. 4, electromagnetic heating system 100 can also include that an IGBT manages (Insulated Gate
Bipolar Transistor, insulated gate bipolar transistor), controller 2 can be realized by the IGBT pipe heats electricity to resonance
The control on road 10.
Specifically, AC power source 1 exports alternating current, and rectification circuit 20 receives the alternating current and carries out rectification processing to it,
Rectified alternating current is converted alternating current to, the second filter circuit 30 receives the Rectified alternating current, and filters to Rectified alternating current
Wave processing, by treated, Rectified alternating current is supplied to resonant heating circuit 10 to the second filter circuit 30, while controller 2 passes through
On-off control to IGBT, so that resonant heating circuit 10 is started to work, the bottom of a pan discharges rapidly out a large amount of heat, reaches heating
Purpose, during heating, current detection circuit 40 can also start to work, i.e. current transformer L3 real-time detection resonance
The electric current of inductance L2.
It should be noted that the specific embodiment party of the current detection circuit 40 of the electromagnetic heating system 100 of the utility model
Formula may refer to the specific embodiment of above-mentioned current detection circuit 40.
The electromagnetic heating system of the utility model flows through the electric current of resonant inductance, energy by the detection of its current detection circuit
Extraneous interference is enough avoided, the accuracy of detection is improved, to improve the accuracy of control.
Fig. 5 is the structural block diagram according to the electric cooking pot of the utility model embodiment.
As shown in figure 5, the electric cooking pot 200 of the utility model includes the electromagnetic heating system of the utility model above-described embodiment
System 100.
The electric cooking pot of the utility model passes through its current detection circuit using the electromagnetic heating system of the utility model
The electric current of resonant inductance is flowed through in detection, can be avoided extraneous interference, the accuracy of detection is improved, to improve the accurate of control
Property.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable
The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure
Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model
System.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention,
It is a, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside element, unless otherwise restricted clearly.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention unless specifically defined or limited otherwise, fisrt feature is in the second feature " on " or " down "
It can be that the first and second features directly contact or the first and second features are by intermediary mediate contact.Moreover, first is special
Sign can be fisrt feature above the second feature " above ", " above " and " above " and be directly above or diagonally above the second feature, or only
Indicate that first feature horizontal height is higher than second feature.Fisrt feature under the second feature " below ", " below " and " below " can be with
It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are in the scope of the utility model
Inside it can make changes, modifications, alterations, and variations to the above described embodiments.
Claims (9)
1. a kind of current detection circuit of electromagnetic heating system, which is characterized in that the electromagnetic heating system includes resonance heating
Circuit, the resonant heating circuit include resonant capacitance and resonant inductance, one end of the resonant capacitance and the resonant inductance
One end be connected, the current detection circuit includes:
Power supply circuit, the power supply circuit are used to power to the current detection circuit；
Current transformer, one end of the secondary coil of the current transformer are connected with the power supply circuit, the secondary coil
The other end be connected with controller, the other end phase of one end of the primary coil of the current transformer and the resonant inductance
Even, the other end of the primary coil is connected with the other end of the resonant capacitance.
2. the current detection circuit of electromagnetic heating system as described in claim 1, which is characterized in that further include:
First filter circuit, first filter circuit are connected between the power supply circuit and the secondary coil.
3. the current detection circuit of electromagnetic heating system as claimed in claim 2, which is characterized in that the power supply circuit packet
It includes:
Default power supply；
First resistor, one end of the first resistor are connected with the default power supply, the other end of the first resistor with it is described
One end of secondary coil is connected, and forms first node；
Second resistance, one end of the second resistance are connected with the first node, the other end ground connection of the second resistance.
4. the current detection circuit of electromagnetic heating system as claimed in claim 3, which is characterized in that first filter circuit
Include:
One end of first filter capacitor, first filter capacitor is connected with the first node, first filter capacitor
The other end is connected with the other end of the secondary coil；
Damping resistance, the damping resistance are connected in parallel with first filter capacitor.
5. the current detection circuit of electromagnetic heating system as described in claim 1, which is characterized in that the power supply circuit also with
The controller is connected, to power to the controller.
6. a kind of electromagnetic heating system characterized by comprising
Resonant heating circuit, the resonant heating circuit include resonant capacitance and resonant inductance, one end of the resonant capacitance with
One end of the resonant inductance is connected；
The input terminal of rectification circuit, the rectification circuit is connected with AC power source, and the rectification circuit is for receiving the exchange
The alternating current of power supply output, and rectification processing is carried out with output ripple direct current to the alternating current；
The input terminal of second filter circuit, second filter circuit is connected with the output end of the rectification circuit, and described second
The output end of filter circuit is connected with the resonant heating circuit, second filter circuit be used for the Rectified alternating current into
Row filtering processing, and Rectified alternating current is supplied to the resonant heating circuit by treated；
Current detection circuit according to any one of claims 1 to 5.
7. electromagnetic heating system as claimed in claim 6, which is characterized in that further include:
EMC protection circuitry, the EMC protection circuitry are connected between the AC power source and the rectification circuit.
8. electromagnetic heating system as claimed in claims 6 or 7, which is characterized in that second filter circuit includes:
Filter inductance, one end of the filter inductance are connected with the first output end of the rectification circuit, the filter inductance
The other end is connected with one end of one end of the resonant inductance and the resonant capacitance respectively, and forms second node；
One end of second filter capacitor, second filter capacitor is connected with the second node, second filter capacitor
The other end is connected with the second output terminal of the rectification circuit, and is grounded.
9. a kind of electricity cooking pot, which is characterized in that including the electromagnetic heating system as described in any one of claim 6-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822269741.6U CN209448919U (en) | 2018-12-29 | 2018-12-29 | Electromagnetic heating system and its current detection circuit and electric cooking pot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822269741.6U CN209448919U (en) | 2018-12-29 | 2018-12-29 | Electromagnetic heating system and its current detection circuit and electric cooking pot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209448919U true CN209448919U (en) | 2019-09-27 |
Family
ID=68015928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822269741.6U Active CN209448919U (en) | 2018-12-29 | 2018-12-29 | Electromagnetic heating system and its current detection circuit and electric cooking pot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209448919U (en) |
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2018
- 2018-12-29 CN CN201822269741.6U patent/CN209448919U/en active Active
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