CN107371287A - Power circuit, electromagnetic heating circuit and electromagnetic heating apparatus - Google Patents
Power circuit, electromagnetic heating circuit and electromagnetic heating apparatus Download PDFInfo
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- CN107371287A CN107371287A CN201610312751.6A CN201610312751A CN107371287A CN 107371287 A CN107371287 A CN 107371287A CN 201610312751 A CN201610312751 A CN 201610312751A CN 107371287 A CN107371287 A CN 107371287A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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Abstract
The invention discloses a kind of power circuit, electromagnetic heating circuit and electromagnetic heating apparatus, power circuit includes：The power circuit is connected between AC power and resonance circuit, and the power circuit includes：Full-bridge rectification module, the full-bridge rectification module are used to carry out rectification to the alternating current that the AC power provides；Harmonic wave module, the harmonic wave module and the full-bridge rectification wired in parallel, the output voltage of the harmonic wave module and the full-bridge rectification module is superposed to sine voltage, think the resonance circuit power supply, the lowest point of sine voltage is more than or equal to zero after the superposition, and the cycle is the half for the sinusoidal ac that the AC power provides.Thus, by increasing the harmonic wave module with full-bridge rectification wired in parallel, single fundamental frequency sine wave voltage of the lowest point more than zero is converted to the sine voltage for exporting AC power, thus it is possible to vary resonance circuit is delivered to the frequency characteristic of the noise of pan, reduces pan and vibrates and caused noise.
Description
Technical field
The present invention relates to technical field of electric appliances, more particularly to a kind of power circuit, a kind of electromagnetic heating circuit and one kind
Electromagnetic heating apparatus.
Background technology
Related electromagnetic heater such as electromagnetic oven uses mains-supplied, and civil power is becoming half-wave after full-bridge rectification
Alternating current, wherein, half alternating current wave includes the frequency content of fundamental frequency 100Hz and each rank frequency multiplication, and half alternating current wave further turns
Electric current of the chemical conversion containing identical frequency content, and be eventually transferred to by coil panel magnetic coupling on pan noise, feel user
Feel noisy, experience effect is decreased obviously.But correlation technique can not eliminate the direct current fundamental wave harmony wave component after rectification, and then
Pan noise can not be reduced.
Therefore, correlation technique needs to be improved.
The content of the invention
It is contemplated that at least solves one of technical problem in correlation technique to a certain extent.Therefore, the present invention
One purpose is to propose a kind of power circuit for reducing pan heating noise.
It is another object of the present invention to propose a kind of electromagnetic heating circuit.A further object of the present invention is to propose
A kind of electromagnetic heating apparatus.
To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of power circuit, be connected to AC power and
Between resonance circuit, including：Full-bridge rectification module, the full-bridge rectification module are used for the sinusoidal friendship provided the AC power
Stream electricity carries out rectification；Harmonic wave module, the harmonic wave module and the full-bridge rectification wired in parallel, the harmonic wave module with it is described complete
The output voltage of bridge rectification module is superposed to, and thinks the resonance circuit power supply, the lowest point of sine voltage is big after the superposition
In equal to zero, the cycle is the half for the sinusoidal ac that the AC power provides.
The power circuit proposed according to embodiments of the present invention, the harmonic wave module with full-bridge rectification wired in parallel is added, it is humorous
The lowest point of output voltage is more than or equal to zero after ripple module is superimposed with full-bridge rectification module, and the cycle is the sine that AC power provides
The half of alternating current, that is, the output voltage after being superimposed only has a kind of fundamental frequency, without the electric current of other frequencies, so as to reduce pan
Vibrate and caused noise, improve the experience of user.
According to one embodiment of present invention, the full-bridge rectification module includes：Rectifier bridge, the first of the rectifier bridge are defeated
Enter end with one end of the AC power to be connected, the second input of the rectifier bridge and the other end phase of the AC power
Even, the first output head grounding of the rectifier bridge；First inductance, one end of first inductance and the second of the rectifier bridge defeated
Go out end to be connected, the other end of first inductance is connected with the harmonic wave module.
According to one embodiment of present invention, the harmonic wave module includes：At least one first harmonic injection unit, it is described
At least one first harmonic injection unit is connected in parallel with each other, one end and the rectifier bridge of each first harmonic injection unit
First input end is connected, and the other end of each first harmonic injection unit is connected with the other end of first inductance；Extremely
A few second harmonic injection unit, at least one second harmonic injection unit are connected in parallel with each other, each second harmonic
One end of injection unit is connected with the second input of the rectifier bridge, the other end of each second harmonic injection unit with
The other end of first inductance is connected.
According to one embodiment of present invention, each first harmonic injection unit includes：3rd electric capacity, the described 3rd
One end of electric capacity is connected with the first input end of the rectifier bridge, the 3rd inductance, one end and the described 3rd of the 3rd inductance
The other end of electric capacity is connected, and the other end of the 3rd inductance is connected with the other end of first inductance；Described each second
Harmonic injection unit includes：4th electric capacity, one end of the 4th electric capacity are connected with the second input of the rectifier bridge, and the 4th
Inductance, one end of the 4th inductance are connected with the other end of the 4th electric capacity, the other end of the 4th inductance with it is described
The other end of first inductance is connected.
According to one embodiment of present invention, the capacitance of the 3rd electric capacity of at least one first harmonic injection unit
It is equal with the capacitance of the 4th electric capacity of the second harmonic injection unit, the of at least one first harmonic injection unit
The inductance value of three inductance is equal with the inductance value of the 4th inductance of the second harmonic injection unit.
According to one embodiment of present invention, the inductance value of first inductance is more than at least one first harmonic note
Enter the inductance value of the 3rd inductance of unit and the inductance value of the 4th inductance of at least one second harmonic injection unit.
According to one embodiment of present invention, the frequency of the harmonic wave module output voltage is equal to the 8M times of AC power
The frequency of the sinusoidal ac of offer, M is 1 or M is the even number more than 1.
According to one embodiment of present invention, described power circuit also includes：Filtration module, the filtration module connection
Between the harmonic wave module and the resonance circuit.
According to one embodiment of present invention, the filtration module includes：Second inductance, one end of second inductance with
The harmonic wave module is connected, and the other end of second inductance is connected with the resonance circuit；First electric capacity, first electric capacity
One end be connected with one end of second inductance, the other end of first electric capacity ground connection.
According to one embodiment of present invention, the energy storage of first electric capacity and second inductance at least meets described humorous
Energy of the circuit in a harmonic period that shake discharges demand.
To reach above-mentioned purpose, a kind of electromagnetic heating circuit that another aspect of the present invention embodiment proposes, including：Resonance electricity
Road；IGBT is managed, and the colelctor electrode of the IGBT pipes is connected with the resonance circuit, the grounded emitter of the IGBT pipes；Described
Power circuit, the power circuit are connected between the resonance circuit and the AC power；Drive circuit, the driving electricity
Road is connected with the grid of the IGBT pipes to drive the IGBT pipes to be switched on or off；Control circuit, the control circuit and institute
State drive circuit to be connected, the control circuit is used to control the drive circuit.
The electromagnetic heating circuit proposed according to embodiments of the present invention, pass through above-mentioned power circuit, thus it is possible to vary resonance circuit
The frequency characteristic of the noise of pan is delivered to, pan is reduced and vibrates and caused noise, lift the experience of user.
According to one embodiment of present invention, the resonance circuit includes resonant capacitance and heating coil in parallel, described
Resonant capacitance in parallel and one end of heating coil are connected with the power circuit, the resonant capacitance and heating coil in parallel
The other end be connected with the colelctor electrode of the IGBT pipes.
To reach above-mentioned purpose, a kind of electromagnetic heating apparatus that another aspect of the invention embodiment proposes, including it is described
Electromagnetic heating circuit.
The electromagnetic heating apparatus proposed according to embodiments of the present invention, by above-mentioned electromagnetic heating circuit, equipment can be reduced
Noise, lift the experience of user.
Brief description of the drawings
Fig. 1 is the structural representation of electromagnetic heating system in correlation technique；
Fig. 2 is the block diagram of power circuit according to embodiments of the present invention；
Fig. 3 is the fundamental diagram of power circuit according to an embodiment of the invention；
Fig. 4 is the circuit theory diagrams of power circuit according to an embodiment of the invention；
Fig. 5 is the circuit theory diagrams of power circuit according to an embodiment of the invention, wherein, electric current forward flow；
Fig. 6 is the circuit theory diagrams of power circuit according to an embodiment of the invention, wherein, the flowing of electric current negative sense；
Fig. 7 is the half-wave exchange after half alternating current wave and harmonic in power circuit according to an embodiment of the invention
The waveform diagram of electricity；
Fig. 8 is the waveform signal of half alternating current wave after harmonic in power circuit according to an embodiment of the invention
Figure；And
Fig. 9 be power circuit according to an embodiment of the invention harmonic injection frequency and harmonic injection after sine
The schematic diagram of waveform；
Figure 10 is the circuit theory diagrams of electromagnetic heating circuit according to embodiments of the present invention.
Reference：
AC power 200, resonance circuit 300, power circuit 100, full-bridge rectification module 101, harmonic wave module 102, rectification
Bridge 1011 and filtration module 103；
First inductance L1, first harmonic injection unit 1021, second harmonic injection unit 1022, the second inductance L2, first
Electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 3rd inductance L3, the 4th electric capacity C4, the 4th inductance L4 and transformer T1；
IGBT pipes 400, drive circuit 500, control circuit 600, resonant capacitance Cm and heating coil Lm.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Present inventor has found and recognized first：During electromagnetic heating system is heated, resonance circuit
In coil panel will produce periodically variable magnetic field, the magnetic fields make the bottom of a pan produce vortex in the bottom of pan, pan with
Coil panel is attracting, but pan produces eddy current magnetism again simultaneously, and the polarity of pan eddy current magnetism is identical with the polarity in coil panel magnetic field,
Pan and coil panel and mutually exclusive generation repulsion.
Especially, the pan currently used for electromagnetic heating system is generally 430 stainless steels, and 430 stainless steels have necessarily
Ferromagnetism, therefore, magnetic field caused by coil panel can pan bottom magnetization, and magnetize after the bottom of a pan can be by coil panel magnetic field
Attraction effect, disappeared moment in coil panel magnetic field, magnetic force disappears, but simultaneously during pan magnetize, pan is vortexed electric
Stream produces magnetic field again, and polarity is identical with coil panel polarity of the magnetic field, and pan repels each other again with coil panel.Thus, pan and coil
Disk is constantly attracting, repels each other, and ultimately results in pan and vibrates and produce noise.
Wherein, the attraction size between pan and coil panel and the transient current of coil panel is flowed through into positive correlation, because
This, the frequency characteristic of the current/voltage of coil panel can be eventually transferred on the noise properties of pan.So, as shown in figure 1, city
Electricity after the rectification circuit of electromagnetic heating system by that can be become humorous comprising hundreds of hz ACs by original 50Hz single-frequency alternating currents
Half alternating current wave of wave component, wherein, AC harmonic composition mainly includes 100Hz to 600Hz low-order harmonic.So, when this
After half alternating current wave acts on resonance circuit, flow through the electric current of coil panel also while there is the low-order harmonic of identical frequency, and most
Cause pan that there is the low-order harmonic noise of identical frequency eventually, above-mentioned harmonic noise be mainly distributed on 100Hz, 200Hz, 300Hz,
400Hz, 500Hz and 600Hz frequency, user is set to feel noisy, experience effect is decreased obviously.
Based on this, the embodiment of the present invention proposes a kind of electromagnetic heating system and its denoising device.
Below with reference to the accompanying drawings come describe the embodiment of the present invention proposition electromagnetic heating system and its denoising device.
Fig. 2 is the block diagram of power circuit according to embodiments of the present invention.As shown in Fig. 2 power circuit 100 connects
Between AC power 200 and resonance circuit 300, the power circuit 100 includes：The harmonic module of full-bridge rectification module 101
102。
Wherein, full-bridge rectification module 101 is used to carry out rectification to the sinusoidal ac that AC power 200 provides；Harmonic wave mould
Block 102 is in parallel with full-bridge rectification module 101, and the output voltage of harmonic wave module 102 and full-bridge rectification module 101 is superposed to sine wave
Voltage, think that resonance circuit 300 is powered, the lowest point of sine voltage is more than or equal to zero after superposition, and the cycle provides for AC power
Sinusoidal ac half.
Specifically, the alternating current that AC power 200 provides can be converted to half alternating current wave by full-bridge rectification module 101
(i.e. Rectified alternating current in Fig. 3), harmonic wave module 102 by half alternating current wave harmonic with by the waveform of half alternating current wave
New sine-wave current is transformed to, wherein, the lowest point of sinusoidal waveform is more than or equal to zero, and the cycle of sinusoidal waveform carries for AC power
The half of the sinusoidal ac of confession, and sinusoidal ac reach π/4 that phase provides relative to AC power.
As seen in figures 3-6, the alternating current that AC power 200 provides is converted to half after the rectification of full-bridge rectification module 101
Alternating current wave, half alternating current wave say harmonic wave by being changed into sine wave from non-sinusoidal waveform after the harmonic of harmonic wave module 102
The output voltage of module 102 and full-bridge rectification module 101 is superposed to sine voltage.Thus, the sine voltage after superposition is defeated
What when entering to resonance circuit 300, will only be included 100Hz harmonic wave, and eliminate 200Hz, 300Hz, 400Hz, 500Hz ... is humorous
Ripple, so as to reduce noise caused by pan vibration.
Specifically, as shown in figure 9, the waveform for the alternating current that AC power 200 provides can be handed over as shown in waveform a, specifically
Equation below can be met by flowing electric u1：That is the initial phase of alternating currentFor the virtual value that 0, U is alternating current
The RMS voltage of voltage such as electric main can be 220V.Also, alternating current is defeated after the rectification of full-bridge rectification module 101
Going out voltage u2 waveforms can be as shown in waveform b, and output voltage u2 meets equation below：
Also, output voltage u2 can be such as by the sine voltage u3 obtained after the harmonic of harmonic wave module 102 waveform
Shown in waveform c, specifically, the sine voltage u3 after superposition meets equation below： Wherein ω0During=2 ω, it is seen that the phase of the sine voltage u3 after superposition carries relative to AC power
Sinusoidal ac reach π/4 of confession.
Thus, by when sine voltage u3 is input to resonance circuit 300 corresponding to waveform c, the humorous of 100Hz will only be included
The harmonic wave of ripple, and eliminate 200Hz, 300Hz, 400Hz, 500Hz ..., so as to reduce noise caused by pan vibration.
Circuit structure, the operation principle of the power circuit of the embodiment of the present invention are described below.
According to one embodiment of present invention, as Figure 4-Figure 6, full-bridge rectification module 101 includes：Rectifier bridge 1011 and
One inductance L1.
Wherein, the first input end of rectifier bridge 1011 is connected with one end of AC power 200, and the second of rectifier bridge 1011 is defeated
Enter end with the other end of AC power 200 to be connected, the first output head grounding of rectifier bridge 1011；First inductance L1 one end with it is whole
Second output end of stream bridge 1011 is connected, and the first inductance L1 other end is connected with harmonic wave module 102.
Also, according to one embodiment of present invention, as Figure 4-Figure 6, harmonic wave module 102 includes：At least one first
Harmonic injection unit 1021 and at least one second harmonic injection unit 1022.Wherein, as shown in Figure 5 and Figure 6, first harmonic is noted
It is one to enter unit 1021 and second harmonic injection unit 1022, as shown in Figure 10, first harmonic injection unit 1021 and
Two harmonic injection units 1022 are two, it should be appreciated that first harmonic injection unit 1021 and second harmonic injection are single
The group number of member 1022 is more, and harmonic injection effect is better.
Wherein, at least one first harmonic injection unit 1021 is connected in parallel with each other, each first harmonic injection unit
One end is connected with the first input end of rectifier bridge 1011, and the other end of each first harmonic injection unit is another with the first inductance L1's
One end is connected；At least one second harmonic injection unit 1022 is connected in parallel with each other, one end of each second harmonic injection unit
It is connected with the second input of rectifier bridge 1011, the other end of each second harmonic injection unit and the first inductance L1 other end
It is connected.
Specifically, each first harmonic injection unit 1021 includes：3rd electric capacity C3 and the 3rd inductance L3.Wherein, the 3rd
Electric capacity C3 one end is connected with the first input end of rectifier bridge 1011；3rd inductance L3 one end and the 3rd electric capacity C3 other end
It is connected, the 3rd inductance L3 other end is connected with the first inductance L1 other end.
Also, each second harmonic injection unit 1022 includes：4th electric capacity C4 and the 4th inductance L4.Wherein, the 4th electricity
The one end for holding C4 is connected with the second input of rectifier bridge 1011；4th inductance L4 one end and the 4th electric capacity C4 other end phase
Even, the 4th inductance L4 other end is connected with the first inductance L1 other end.Further, as Figure 4-Figure 6, power circuit is also
Including：Filtration module 103, filtration module 103 are connected between harmonic wave module 102 and resonance circuit 300.
Specifically, filtration module 103 includes：Second inductance L2 and the first electric capacity C1.Wherein, the second inductance L2 one end with
The first inductance L1 other end is connected, and the second inductance L2 other end is connected with resonance circuit 300；First electric capacity C1 one end with
Second inductance L2 one end is connected, the first electric capacity C1 other end ground connection.
Further, as shown in Figure 10, filtration module 103 may also include：Second electric capacity C2.Wherein, the second electric capacity C2
One end is connected with the second inductance L2 other end, the second electric capacity C2 other end ground connection.
Specifically, rectifier bridge 1011 is used to the alternating current that AC power 200 provides being converted to half alternating current wave；3rd
Electric capacity C3 and the 4th electric capacity C4 is nonpolarity coupled capacitor, for coupling the voltage of alternating current to late-class circuit；First electric capacity C1
It is used for energy storage and filtering with the second electric capacity C2；First inductance L1, the second inductance L2, the 3rd inductance L3 and the 4th inductance L4 are used to prevent
Only current break, acted on simultaneous with energy storage.
As described above, with reference to Fig. 5-Fig. 8 embodiment, power circuit is the suction of the coupling effect and inductance using electric capacity
The straight effect of traffic and energy storage are acted on to realize harmonic injection.When alternating current forward flow is electric current from AC power 200
When one end is flowed out and finally flows back to the other end of AC power 200, the flow direction of electric current is as shown in figure 5, alternating current is rectified
The rectification of bridge 1011 is half alternating current wave, and alternating current is injected into half alternating current wave so that half-wave is handed over after the 3rd electric capacity C3 couplings
The waveform of stream electricity becomes more smooth, and now the 4th electric capacity C4 no currents flow through, but because the 4th electric capacity C4's and the 4th inductance L4
Characteristic, the vibration for generally conforming to sine wave rule can be formed inside it；When alternating current negative sense flowing is electric current from AC power 200
The other end flow out and when finally flowing back to one end of AC power 200, the flow direction of electric current as shown in fig. 6, alternating current through whole
After the stream rectification of bridge 1011 is half alternating current wave, and alternating current is injected into the rectification of rectifier bridge 101 after the 4th electric capacity C4 couplings
Half alternating current wave is so that the waveform of half alternating current wave becomes more smooth, and now the 3rd electric capacity C3 no currents flow through, but because of the 3rd
Electric capacity C3 and the 3rd inductance L3 characteristic, the vibration for generally conforming to sine wave rule can be formed inside it.
Specifically, 4 input terminals of oscillograph can be corresponded to and be connected with A points, B points, C points and D points, it is whole with corresponding observation
The voltage waveform of node between the voltage waveform of half alternating current wave after stream, the 3rd electric capacity C3 and the 3rd inductance L3, the 4th electricity
Hold the voltage waveform of node between C4 and the 4th inductance L4 and the direct current of A points, B points and C points is superimposed through the second inductance L2
Voltage waveform afterwards, specifically, A points voltage waveform, B points voltage waveform, C point voltage waveforms and D points voltage waveform can be such as Fig. 7 institutes
Show.
So, half alternating current wave after rectification passes through first harmonic injection unit 1021 and second harmonic injection unit 1022
After Injection Current, waveform integrally becomes more smooth, while because of the 3rd electric capacity C3, the 3rd inductance L3, the 4th electric capacity C4 and the 4th
Inductance L4 characteristic determines, the inside meeting of the 3rd electric capacity C3 and the 3rd inductance L3 inside, the 4th electric capacity C4 and the 4th inductance L4
Certain vibration is formed, this waveform generally conforms to sine wave rule (B point voltage waveforms and C point voltages in such as Fig. 7 just
Waveform), it is superimposed on into the second inductance L2 with half alternating current wave can form a preferably band DC component sine wave substantially.
It should be noted that in the specific example of the present invention, at least one first harmonic injection unit 1021
3rd electric capacity is equal with the capacitance of at least one electric capacity of second harmonic injection unit 1022 the 4th, at least one first harmonic note
It is equal with the inductance value of at least one inductance of second harmonic injection unit 1022 the 4th to enter the inductance value of the inductance of unit 1021 the 3rd,
Say as shown in Figure 5 and Figure 6, the 4th electric capacity C4 capacitance is equal with the 3rd electric capacity C4 capacitance, the 4th inductance L4 electricity
Inductance value is equal with the 3rd inductance L3 inductance value.Thus, it is ensured that half alternating current wave after rectification is changed into after harmonic injection
Complete sinusoidal waveform.
Also, the first inductance L1 inductance value is more than the capacitance or at least of at least one first harmonic injection unit 1021
The inductance value of one second harmonic injection unit 1022, that is, say as shown in Figure 5 and Figure 6, the first inductance L1 inductance value is more than the
Four inductance L4 or the 3rd inductance L3 inductance value.Because it is larger by the first inductance L1 electric current, and pass through the 4th inductance
L4 or the 3rd inductance L3 electric current are relatively small, in order to ensure three's synchronization, need to ensure the 4th inductance L4 inductance value and the 3rd
Inductance L3 inductance value is equal, and the first inductance L1 inductance value is more than the 4th inductance L4 or the 3rd inductance L3 inductance value.
In addition, according to one embodiment of present invention, harmonic wave module 102 by the harmonic of full-bridge rectification module 101,
So that the output voltage of harmonic wave module 102 and full-bridge rectification module 101 is superposed to sine voltage, wherein, harmonic wave voltage
The frequency of sinusoidal ac that provides of AC power 200 of the frequency equal to 8M times, M is 1 or M is even number more than 1, i.e. M can
Equal to 1,2,4,6 ....
Specifically, as shown in figure 9, the slope of the sine voltage after superposition is at the 1/4 of alternating current half period
It will change, can be humorous by the timing definition between any two neighboring slope turning point on the sine voltage after superposition
Ripple injected frequency f, harmonic injection frequency f can be equal to the frequency of 8 times of sinusoidal ac.Thus, the 3rd inductance L3, the 4th inductance
L4, the first inductance L1, the 4th electric capacity C4 and the 3rd electric capacity C4 Type Selection Principle on it is related with the frequency such as 50Hz of alternating current, with
The ac frequency such as 400Hz for making harmonic injection frequency be equal to 8M times.
Also, the first electric capacity C1 and the second inductance L2 energy storage need at least meet resonance circuit 300 in a harmonic period
Interior energy release demand, that is, say that the first electric capacity C1 and the second inductance L2 type selecting are related to the resonant parameter of resonance circuit 300,
First electric capacity C1 and the second inductance L2 energy storage want enough resonance circuits 300 to be discharged in a harmonic period.
According to the specific example of the present invention, under different capacity, the 3rd inductance L3, the second inductance L2, the 4th inductance
L4, the first inductance L1, the first electric capacity C1, the 3rd electric capacity C3 and the 4th electric capacity C4 parameter can be configured according to table 1 below, it is necessary to
Illustrate, these parameters can not be changed at will, differed and surely counted relation at double.
Table 1
Further, as Figure 4-Figure 6, full-bridge rectification module 101 is connected by transformer T1 with AC power 200, its
In, transformer T1 primary one end is connected with one end of AC power 200, the transformer T1 primary other end and alternating current
The other end in source 200 is connected, and transformer T1 secondary one end is connected with the first input end of rectifier bridge 1011, transformer T1's
The secondary other end is connected with the second input of rectifier bridge 1011.
Specifically, transformer T1 is used to isolate AC power 200 with rear class loop, is returned with forming independent rear class
Road.
To sum up, the power circuit proposed according to embodiments of the present invention, the harmonic wave mould with full-bridge rectification wired in parallel is added
Block, the lowest point of output voltage is more than or equal to zero after harmonic wave module is superimposed with full-bridge rectification module, and the cycle provides for AC power
Sinusoidal ac half, that is, be superimposed after output voltage there was only a kind of fundamental frequency, so as to reduce pan vibration and it is caused
Noise, improve the experience of user.
The embodiment of the present invention also proposed a kind of electromagnetic heating circuit, as shown in figure 3, electromagnetic heating circuit includes：Resonance
Circuit 300, IGBT pipes 400, above-mentioned power circuit 100, drive circuit 500 and control circuit 600.
Wherein, the colelctor electrode of IGBT pipes 400 is connected with resonance circuit 300, the grounded emitter of IGBT pipes 400；Power supply electricity
Road 100 is connected between resonance circuit 300 and AC power 200；Drive circuit 500 is connected with the grid of IGBT pipes 400 to drive
Dynamic IGBT pipes 400 are switched on or off；Control circuit 600 is connected with drive circuit 500, and control circuit 600 is used to control driving electricity
Road 500 drives IGBT pipes 400 to pass through drive circuit 500.
Specifically, resonance circuit 300 may include the resonant capacitance Cm and heating coil Lm, resonant capacitance Cm in parallel of parallel connection
Be connected with heating coil Lm one end with power circuit 100, resonant capacitance Cm in parallel and heating coil the Lm other end with
The colelctor electrode of IGBT pipes 400 is connected.
It should be appreciated that the circuit structure of electromagnetic heating circuit and its all parts, operation principle belong to prior art,
It is well known to those of ordinary skill in the art, here in succinct purpose, repeats no more.
To sum up, the electromagnetic heating circuit proposed according to embodiments of the present invention, above-mentioned power circuit is passed through, thus it is possible to vary resonance
Circuit is delivered to the frequency characteristic of the noise of pan, reduces pan and vibrates and caused noise, lifts the experience of user.
Finally, the embodiment of the present invention has also been proposed a kind of electromagnetic heating apparatus, including above-mentioned electromagnetic heating circuit.
Wherein, electromagnetic heating apparatus can be electromagnetic oven, electromagnetic rice cooker or prevention electromagnetic pressure cooker etc..
The electromagnetic heating apparatus proposed according to embodiments of the present invention, by setting above-mentioned electromagnetic heating circuit, it can reduce and set
Standby noise, lifts the experience of user.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, limited unless otherwise clear and definite.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the different embodiments or example and the feature of different embodiments or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (13)
1. a kind of power circuit, is connected between AC power and resonance circuit, it is characterised in that including：
Full-bridge rectification module, the full-bridge rectification module are used to carry out rectification to the sinusoidal ac that the AC power provides；
Harmonic wave module, the harmonic wave module and the full-bridge rectification wired in parallel, the harmonic wave module and the full-bridge rectification mould
The output voltage of block is superposed to sine voltage, thinks the resonance circuit power supply, the lowest point of sine voltage after the superposition
More than or equal to zero, the cycle is the half for the sinusoidal ac that the AC power provides.
2. power circuit according to claim 1, it is characterised in that the full-bridge rectification module includes：
Rectifier bridge, the first input end of the rectifier bridge are connected with one end of the AC power, and the second of the rectifier bridge is defeated
Enter end with the other end of the AC power to be connected, the first output head grounding of the rectifier bridge；
First inductance, one end of first inductance are connected with the second output end of the rectifier bridge, first inductance it is another
One end is connected with the resonance circuit.
3. power circuit according to claim 2, it is characterised in that the harmonic wave module includes：
At least one first harmonic injection unit, at least one first harmonic injection unit are connected in parallel with each other, Mei Ge
One end of one harmonic injection unit is connected with the first input end of the rectifier bridge, each first harmonic injection unit it is another
One end is connected with the other end of first inductance；
At least one second harmonic injection unit, at least one second harmonic injection unit are connected in parallel with each other, Mei Ge
One end of two harmonic injection units is connected with the second input of the rectifier bridge, each second harmonic injection unit it is another
One end is connected with the other end of first inductance.
4. power circuit according to claim 3, it is characterised in that each first harmonic injection unit includes：
3rd electric capacity, one end of the 3rd electric capacity are connected with the first input end of the rectifier bridge,
3rd inductance, one end of the 3rd inductance are connected with the other end of the 3rd electric capacity, the 3rd inductance it is another
End is connected with the other end of first inductance；Each second harmonic injection unit includes：
4th electric capacity, one end of the 4th electric capacity are connected with the second input of the rectifier bridge,
4th inductance, one end of the 4th inductance are connected with the other end of the 4th electric capacity, the 4th inductance it is another
End is connected with the other end of first inductance.
5. power circuit according to claim 4, it is characterised in that at least one first harmonic injection unit
The 3rd electric capacity it is equal with the capacitance of the 4th electric capacity of the second harmonic injection unit, at least one first harmonic note
The 3rd inductance for entering unit is equal with the inductance value of the 4th inductance of the second harmonic injection unit.
6. power circuit according to claim 4, it is characterised in that the inductance value of first inductance be more than it is described at least
The of the inductance value of 3rd inductance of one first harmonic injection unit and at least one second harmonic injection unit
The inductance value of four inductance.
7. power circuit according to claim 1, it is characterised in that the frequency of the harmonic wave module output voltage is equal to 8M
The frequency for the sinusoidal ac that the AC power provides again, M is 1 or M is the even number more than 1.
8. power circuit according to claim 1, it is characterised in that also include：
Filtration module, the filtration module are connected between the harmonic wave module and the resonance circuit.
9. power circuit according to claim 8, it is characterised in that the filtration module includes：
Second inductance, one end of second inductance are connected with the harmonic wave module, the other end of second inductance with it is described
Resonance circuit is connected；
First electric capacity, one end of first electric capacity are connected with one end of second inductance, the other end of first electric capacity
Ground connection.
10. power circuit according to claim 9, it is characterised in that the storage of first electric capacity and second inductance
Energy release demand of the resonance circuit in a harmonic period can at least be met.
A kind of 11. electromagnetic heating circuit, it is characterised in that including：
Resonance circuit；
IGBT is managed, and the colelctor electrode of the IGBT pipes is connected with the resonance circuit, the grounded emitter of the IGBT pipes；
According to the power circuit any one of claim 1-10, the power circuit is connected to the resonance circuit and institute
State between AC power；
Drive circuit, the drive circuit are connected with the grid of the IGBT pipes to drive the IGBT pipes to be switched on or off；
Control circuit, the control circuit are connected with the drive circuit, and the control circuit is used to control the drive circuit.
12. electromagnetic heating circuit according to claim 11, it is characterised in that the resonance circuit includes resonance in parallel
Electric capacity and heating coil, one end of the resonant capacitance in parallel and heating coil are connected with the power circuit, the parallel connection
Resonant capacitance and the other end of heating coil be connected with the colelctor electrode of the IGBT pipes.
13. a kind of electromagnetic heating apparatus, it is characterised in that including the electromagnetic heating circuit according to claim 11 or 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312751.6A CN107371287B (en) | 2016-05-11 | 2016-05-11 | Power supply circuit, electromagnetic heating circuit and electromagnetic heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610312751.6A CN107371287B (en) | 2016-05-11 | 2016-05-11 | Power supply circuit, electromagnetic heating circuit and electromagnetic heating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107371287A true CN107371287A (en) | 2017-11-21 |
| CN107371287B CN107371287B (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610312751.6A Active CN107371287B (en) | 2016-05-11 | 2016-05-11 | Power supply circuit, electromagnetic heating circuit and electromagnetic heating equipment |
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| Country | Link |
|---|---|
| CN (1) | CN107371287B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191525A (en) * | 2019-06-26 | 2019-08-30 | 深圳市鑫汇科股份有限公司 | Electromagnetic heating apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2826890Y (en) * | 2005-09-07 | 2006-10-11 | 江苏兴荣高新科技股份有限公司 | Induction heating power supply for processing Cu-Al pipe |
| CN202077230U (en) * | 2011-05-04 | 2011-12-14 | 深圳市金流明光电技术有限公司 | LED power circuit matched with electronic transformer |
| CN202841664U (en) * | 2012-09-03 | 2013-03-27 | 安徽明威照明器材有限公司 | Electronic ballast circuit used for energy saving lamp |
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| CN2826890Y (en) * | 2005-09-07 | 2006-10-11 | 江苏兴荣高新科技股份有限公司 | Induction heating power supply for processing Cu-Al pipe |
| CN202077230U (en) * | 2011-05-04 | 2011-12-14 | 深圳市金流明光电技术有限公司 | LED power circuit matched with electronic transformer |
| CN202841664U (en) * | 2012-09-03 | 2013-03-27 | 安徽明威照明器材有限公司 | Electronic ballast circuit used for energy saving lamp |
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| CN110191525A (en) * | 2019-06-26 | 2019-08-30 | 深圳市鑫汇科股份有限公司 | Electromagnetic heating apparatus |
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| Publication number | Publication date |
|---|---|
| CN107371287B (en) | 2020-09-01 |
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