CN205657594U - Power supply circuit , electromagnetic heating circuit and electromagnetic heating equipment - Google Patents
Power supply circuit , electromagnetic heating circuit and electromagnetic heating equipment Download PDFInfo
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- CN205657594U CN205657594U CN201620428445.4U CN201620428445U CN205657594U CN 205657594 U CN205657594 U CN 205657594U CN 201620428445 U CN201620428445 U CN 201620428445U CN 205657594 U CN205657594 U CN 205657594U
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Abstract
The utility model discloses a power supply circuit, electromagnetic heating circuit and electromagnetic heating equipment, power supply circuit includes: power supply circuit connects between alternating current power supply and resonance circuit, power supply circuit includes: full -bridge rectifier module, it is right that full -bridge rectifier module is used for the alternating current that alternating current power supply provided carries out the rectification, the harmonic module, the harmonic module with full -bridge rectifier module is parallelly connected, the harmonic module with full -bridge rectifier module's output voltage stack is thought for sine wave voltage the resonance circuit power supply, stack back sine wave voltage's valley bottom more than or equal to zero, the cycle does sinusoidal ac's that alternating current power supply provided is half the. From this, through increasing the harmonic module parallelly connected with full -bridge rectifier module to convert the sine wave voltage of alternating current power supply output into single base frequency sine wave voltage that the valley bottom is greater than zero, can change the frequency characteristic that resonance circuit transmitted the noise of pan, reduce the pan vibration and the noise of production.
Description
Technical field
This utility model relates to technical field of electric appliances, particularly to a kind of power circuit, a kind of electromagnetic heating circuit and
A kind of electromagnetic heating apparatus.
Background technology
Relevant 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 fundamental frequency 100Hz and the frequency content of each rank frequency multiplication, and this half alternating current wave turns further
The chemical conversion electric current containing same frequency composition, and be eventually transferred on pan noise by the coupling of coil panel magnetic field, make user feel
Feeling noisy, experience effect is decreased obviously.But, correlation technique cannot eliminate the direct current first-harmonic after rectification and harmonic components, and then
Pan noise cannot be reduced.
Therefore, correlation technique needs to improve.
Utility model content
One of technical problem that this utility model is intended to solve in correlation technique the most to a certain extent.To this end, this reality
It is that proposing a kind of pan that reduces adds the power circuit of thermal noise by a novel purpose.
Another purpose of the present utility model is to propose a kind of electromagnetic heating circuit.Another purpose of the present utility model
It is to propose a kind of electromagnetic heating apparatus.
For reaching above-mentioned purpose, on the one hand this utility model proposes a kind of power circuit, is connected to alternating current power supply harmonious
Shake between circuit, including: full-bridge rectification module, described full-bridge rectification module is for the simple alternating current providing described alternating current power supply
Electricity carries out rectification；Harmonic wave module, described harmonic wave module and described full-bridge rectification wired in parallel, described harmonic wave module and described full-bridge
The output voltage of rectification module is superposed to, and thinks that described resonance circuit is powered, and after described superposition, the lowest point of sine voltage is more than
Equal to zero, the half of the sinusoidal ac that the cycle provides for described alternating current power supply, and phase place provides relative to described alternating current power supply
Sinusoidal ac reach π/4.
According to the power circuit that the utility model proposes, add the harmonic wave module with full-bridge rectification wired in parallel, harmonic wave
Module superpose with full-bridge rectification module after the lowest point of output voltage more than or equal to zero, and the cycle sinusoidal hands over for what alternating current power supply provided
A kind of fundamental frequency of the half of stream electricity, i.e. output voltage after superposition, does not has the electric current of other frequency, thus reduces pan and shake
The noise moved and produce, improves the experience of user.
Specifically, described full-bridge rectification module includes: rectifier bridge, the first input end of described rectifier bridge and described alternating current
The one end in source is connected, and the second input of described rectifier bridge is connected with the other end of described alternating current power supply, the of described rectifier bridge
One output head grounding；First inductance, one end of described first inductance is connected with the second outfan of described rectifier bridge, and described first
The other end of inductance is connected with described harmonic wave module.
Specifically, described harmonic wave module includes: at least one first harmonic injection unit, at least one first harmonic described
Injection unit is connected in parallel with each other, and one end of each first harmonic injection unit is connected with the first input end of described rectifier bridge,
The other end of described each first harmonic injection unit is connected with the other end of described first inductance；At least one second harmonic is noted
Entering unit, at least one second harmonic injection unit described is connected in parallel with each other, one end of each second harmonic injection unit with
Second input of described rectifier bridge is connected, and the other end of described each second harmonic injection unit is another with described first inductance
One end is connected.
More specifically, described each first harmonic injection unit includes: the 3rd electric capacity, one end of described 3rd electric capacity and institute
The first input end stating rectifier bridge is connected, the 3rd inductance, the other end phase of one end and described 3rd electric capacity of described 3rd inductance
Even, the other end of described 3rd inductance is connected with the other end of described first inductance；4th electric capacity, one end of described 4th electric capacity
It is connected with the second input of described rectifier bridge；4th inductance, another of one end of described 4th inductance and described 4th electric capacity
End is connected, and the other end of described 4th inductance is connected with the other end of described first inductance.
Wherein, the capacitance of the 3rd electric capacity of at least one described first harmonic injection unit injects with described second harmonic
The capacitance of the 4th electric capacity of unit is equal, the inductance value of the 3rd inductance of at least one described first harmonic injection unit and institute
The inductance value of the 4th inductance stating second harmonic injection unit is equal.
Further, the inductance value of the 3rd inductance of at least one described first harmonic injection unit and at least one described second
The inductance value of the 4th inductance of harmonic injection unit.
Specifically, the sinusoidal friendship that the frequency of the output voltage of the described harmonic wave module described alternating current power supply equal to 8M times provides
The frequency of stream electricity, M is 1 or M to be the even number more than 1.
Further, described power circuit also includes: filtration module, and described filtration module is connected to described harmonic wave module
And between described resonance circuit.
Specifically, described filtration module includes: the second inductance, one end of described second inductance and described harmonic wave module phase
Even, the other end of described second inductance is connected with described resonance circuit；First electric capacity, one end of described first electric capacity and described the
One end of two inductance is connected, the other end ground connection of described first electric capacity.
Wherein, the energy storage of described first electric capacity and described second inductance at least meets described resonance circuit a resonance week
Energy release demand in phase.
For reaching above-mentioned purpose, a kind of electromagnetic heating circuit that on the other hand this utility model proposes, including: resonance electricity
Road；IGBT manages, and the colelctor electrode of described IGBT pipe is connected with described resonance circuit, the grounded emitter of described IGBT pipe；Described
Power circuit, described power circuit is connected between described resonance circuit and described alternating current power supply；Drive circuit, described driving electricity
Road is connected with the grid of described IGBT pipe to drive described IGBT pipe to be switched on or off；Control circuit, described control circuit and institute
Stating drive circuit to be connected, described control circuit is used for controlling described drive circuit.
According to the electromagnetic heating circuit that the utility model proposes, by above-mentioned power circuit, thus it is possible to vary resonance circuit passes
It is delivered to the frequency characteristic of the noise of pan, the noise that reduction pan vibrates and produces, promotes the experience of user.
Specifically, described resonance circuit include parallel connection resonant capacitance and heating coil, the resonant capacitance of described parallel connection and
One end of heating coil is connected with described power circuit, and the other end of the resonant capacitance of described parallel connection and heating coil is with described
The colelctor electrode of IGBT pipe is connected.
For reaching above-mentioned purpose, a kind of electromagnetic heating apparatus that the another aspect of this utility model proposes, including described electricity
Magnetic heater circuit.
According to the electromagnetic heating apparatus that the utility model proposes, by above-mentioned electromagnetic heating circuit, it is possible to decrease equipment is made an uproar
Sound, promotes the experience of user.
Accompanying drawing explanation
Fig. 1 is the structural representation of electromagnetic heating system in correlation technique；
Fig. 2 is the block diagram of the power circuit according to this utility model embodiment；
Fig. 3 is the fundamental diagram of the power circuit according to one embodiment of this utility model；
Fig. 4 is the circuit theory diagrams of the power circuit according to one embodiment of this utility model；
Fig. 5 is the circuit theory diagrams of the power circuit according to one embodiment of this utility model, wherein, and electric current forward stream
Dynamic；
Fig. 6 is the circuit theory diagrams of the power circuit according to one embodiment of this utility model, wherein, electric current negative flow
Dynamic；
Fig. 7 is the half-wave in the power circuit according to one embodiment of this utility model after half alternating current wave and harmonic
The waveform diagram of alternating current；
Fig. 8 is the waveform of half alternating current wave in the power circuit according to one embodiment of this utility model after harmonic
Schematic diagram；And
After Fig. 9 is the harmonic injection frequency of the power circuit according to one embodiment of this utility model and harmonic injection
Sine-shaped schematic diagram；
Figure 10 is the circuit theory diagrams of the electromagnetic heating circuit according to this utility model embodiment.
Reference:
Alternating current power supply 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 the 1022, 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 transformator T1；
IGBT pipe 400, drive circuit 500, control circuit 600, resonant capacitance Cm and heating coil Lm.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
It is exemplary for examining the embodiment that accompanying drawing describes, it is intended to be used for explaining this utility model, and it is not intended that to this utility model
Restriction.
First the application utility model people finds and recognizes: during electromagnetic heating system heats, resonance
Coil panel in circuit will produce periodically variable magnetic field, and this action of a magnetic field, in the bottom of pan, makes the bottom of a pan produce eddy current, pot
Have attracting with coil panel, but pan produces again the polarity in eddy current magnetism, the polarity of pan eddy current magnetism and coil panel magnetic field simultaneously
Identical, pan and coil panel the most mutually exclusive generation repulsion.
Especially, the pan being currently used for electromagnetic heating system is generally 430 rustless steels, and 430 rustless steels have necessarily
Ferromagnetism, therefore, coil panel produce magnetic field can pan bottom magnetization, and magnetize after the bottom of a pan can be by coil panel magnetic field
Captivation effect, disappear moment in coil panel magnetic field, magnetic force disappears, but simultaneously during magnetization pan, pan vortex electricity
Stream produces again magnetic field, 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
Dish is the most attracting, repel each other, and ultimately results in pan and vibrates and produce noise.
Wherein, the captivation size between pan with coil panel becomes positive correlation with the transient current flowing through coil panel, because of
This, the frequency characteristic of the current/voltage of coil panel can be eventually transferred on the noise properties of pan.So, as it is shown in figure 1, city
By after the rectification circuit of electromagnetic heating system, electricity be become by original 50Hz single-frequency alternating current that to comprise hundreds of hz AC humorous
Half alternating current wave of wave component, wherein, AC harmonic composition mainly includes the low-order harmonic of 100Hz to 600Hz.So, when this
After half alternating current wave acts on resonance circuit, the electric current flowing through coil panel has a low-order harmonic of same frequency the most simultaneously, and
Cause pan to have the low-order harmonic noise of same frequency eventually, above-mentioned harmonic noise be mainly distributed on 100Hz, 200Hz, 300Hz,
400Hz, 500Hz and 600Hz frequency, makes user feel noisy, and experience effect is decreased obviously.
Based on this, this utility model embodiment proposes a kind of electromagnetic heating system and denoising device thereof.
Below with reference to the accompanying drawings electromagnetic heating system and denoising device thereof that this utility model embodiment proposes are described.
Fig. 2 is the block diagram of the power circuit according to this utility model embodiment.As in figure 2 it is shown, power circuit 100
Being connected between alternating current power supply 200 and resonance circuit 300, this power circuit 100 includes: the harmonious mode of full-bridge rectification module 101
Block 102.
Wherein, full-bridge rectification module 101 carries out rectification for the sinusoidal ac providing alternating current power supply 200；Harmonic wave mould
Block 102 is in parallel with full-bridge rectification module 101, and harmonic wave module 102 is superposed to sine wave with the output voltage of full-bridge rectification module 101
Voltage, thinks that resonance circuit 300 is powered, and after superposition, the lowest point of sine voltage is more than or equal to zero, and the cycle provides for alternating current power supply
The half of sinusoidal ac, and sinusoidal ac reach π/4 that phase place provides relative to alternating current power supply.
Specifically, the alternating current that alternating current power supply 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 is passed through to half alternating current wave harmonic with by the ripple of pulse direct current
Deformation is changed to sinusoidal wave form, and wherein, sine-shaped the lowest point is more than or equal to zero, and the sine-shaped cycle provides for alternating current power supply
The half of sinusoidal ac.
As seen in figures 3-6, the alternating current that alternating current power supply 200 provides is converted to half after full-bridge rectification module 101 rectification
Alternating current wave, this half alternating current wave, by being become sinusoidal wave from non-sinusoidal waveform after harmonic wave module 102 harmonic, i.e. says harmonic wave
Module 102 is superposed to sine voltage with the output voltage of full-bridge rectification module 101.Thus, the sine voltage after superposition is defeated
When entering to resonance circuit 300, will only comprise the harmonic wave of 100Hz, and eliminate 200Hz, 300Hz, 400Hz, 500Hz ... humorous
Ripple, thus reduce the noise that pan vibration produces.
Specifically, as it is shown in figure 9, the waveform of the alternating current of alternating current power supply 200 offer can be as shown in waveform a, specifically, hand over
Stream electricity u1 can meet equation below:The i.e. initial phase of alternating currentBeing 0, U is the virtual value of alternating current
The virtual value voltage of voltage such as electric main can be 220V.Further, defeated after full-bridge rectification module 101 rectification of alternating current
Going out voltage u2 waveform can be as shown in waveform b, and output voltage u2 meets equation below:And
Further, the waveform of the output voltage u2 sine voltage u3 by obtaining after harmonic wave module 102 harmonic can be such as
Shown in waveform c, specifically, the sine voltage u3 after superposition meets equation below: Wherein ω0During=2 ω, the phase place of the sine voltage u3 after superposition is just providing relative to alternating current power supply
String alternating current reach π/4.
Thus, when sine voltage u3 corresponding for waveform c is input to resonance circuit 300, will only comprise the humorous of 100Hz
Ripple, and eliminate 200Hz, 300Hz, 400Hz, 500Hz ... harmonic wave, thus reduce the noise that pan vibration produces.
The circuit structure of the power circuit of this utility model embodiment, operation principle are described below.
According to an embodiment of the present utility model, as Figure 4-Figure 6, full-bridge rectification module 101 includes: rectifier bridge 1011
With the first inductance L1.
Wherein, the first input end of rectifier bridge 1011 is connected with one end of alternating current power supply 200, and the second of rectifier bridge 1011 is defeated
Enter end to be connected with the other end of alternating current power supply 200, the first output head grounding of rectifier bridge 1011；One end of first inductance L1 is with whole
Second outfan of stream bridge 1011 is connected, and the other end of the first inductance L1 is connected with harmonic wave module 102.
Further, according to an embodiment of the present utility model, 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 is humorous
Ripple injection unit 1021 and second harmonic injection unit 1022 are one, as shown in Figure 10, and first harmonic injection unit 1021
It is two, it should be appreciated that first harmonic injection unit 1021 and second harmonic note with second harmonic injection unit 1022
The group number entering unit 1022 is the most, and harmonic injection effect is the best.
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, the other end of each first harmonic injection unit and the first inductance L1's
The other end is connected；At least one second harmonic injection unit 1022 is connected in parallel with each other, the one of each second harmonic injection unit
End is connected with the second input of rectifier bridge 1011, another of the other end of each second harmonic injection unit and the first inductance L1
End is connected.
Specifically, each first harmonic injection unit 1021 includes: the 3rd electric capacity C3 and the 3rd inductance L3.Wherein, the 3rd
One end of electric capacity C3 is connected with the first input end of rectifier bridge 1011；One end of 3rd inductance L3 and the other end of the 3rd electric capacity C3
Being connected, the other end of the 3rd inductance L3 and the other end of the first inductance L1 are connected.
Further, each second harmonic injection unit 1022 includes: the 4th electric capacity C4 and the 4th inductance L4.Wherein, the 4th electricity
The one end holding C4 is connected with the second input of rectifier bridge 1011；One end of 4th inductance L4 and the other end phase of the 4th electric capacity C4
Even, the other end of the 4th inductance L4 and the other end of the first inductance L1 are connected.Further, as Figure 4-Figure 6, power circuit is also
Including: filtration module 103, filtration module 103 is connected between harmonic wave module 102 and resonance circuit 300.
Specifically, filtration module 103 includes: the second inductance L2 and the first electric capacity C1.Wherein, one end of the second inductance L2 with
The other end of the first inductance L1 is connected, and the other end of the second inductance L2 is connected with resonance circuit 300；One end of first electric capacity C1 with
One end of second inductance L2 is connected, the other end ground connection of the first electric capacity C1.
Further, as shown in Figure 10, filtration module 103 may also include that the second electric capacity C2.Wherein, the second electric capacity C2
One end is connected with the other end of the second inductance L2, the other end ground connection of the second electric capacity C2.
Specifically, rectifier bridge 1011 is for being converted to half alternating current wave by the alternating current that alternating current power supply 200 provides；3rd
Electric capacity C3 and the 4th electric capacity C4 is nonpolarity coupling electric capacity, for coupling the voltage of alternating current to late-class circuit；First electric capacity C1
With the second electric capacity C2 for energy storage and filtering；First inductance L1, the second inductance L2, the 3rd inductance L3 and the 4th inductance L4 are used for preventing
Only current break, simultaneous with energy storage effect.
As it has been described above, combine the embodiment of Fig. 5-Fig. 8, power circuit is the suction of coupling effect and the inductance utilizing electric capacity
The straight effect of traffic and energy storage effect realize harmonic injection.When alternating current forward flow i.e. electric current is from alternating current power supply 200
When one end is flowed out and finally flows back to the other end of alternating current power supply 200, the flow direction of electric current is as it is shown in figure 5, alternating current is rectified
Bridge 1011 rectification 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 coupling
The waveform of stream electricity becomes more to smooth, and now the 4th electric capacity C4 no current flows through, but because of the 4th electric capacity C4's and the 4th inductance L4
Characteristic, can form the vibration generally conforming to sinusoidal wave rule inside it；When the alternating current i.e. electric current of negative sense flowing is from alternating current power supply 200
Other end when flowing out and finally flow back to one end of alternating current power supply 200, as shown in Figure 6, alternating current is through whole for the flow direction of electric current
After stream bridge 1011 rectification is half alternating current wave, and alternating current is injected into rectifier bridge 101 rectification after the 4th electric capacity C4 coupling
Half alternating current wave is so that the waveform of half alternating current wave becomes more to smooth, and now the 3rd electric capacity C3 no current flows through, but because of the 3rd
Electric capacity C3 and the characteristic of the 3rd inductance L3, can form the vibration generally conforming to sinusoidal wave rule inside it.
Specifically, oscillographic 4 input terminals correspondence can be connected with A point, B point, C point and D point, whole with correspondence observation
The voltage waveform of half alternating current wave after stream, the voltage waveform of node between the 3rd electric capacity C3 and the 3rd inductance L3, the 4th electricity
The voltage waveform of the node between appearance C4 and the 4th inductance L4 and the unidirectional current of A point, B point and C point are through the second inductance L2 superposition
After voltage waveform, specifically, A point voltage waveform, B point voltage waveform, C point voltage waveform and D point voltage waveform can be such as Fig. 7 institutes
Show.
So, half alternating current wave after rectification is through first harmonic injection unit 1021 and second harmonic injection unit 1022
After injection current, it is the most smooth that waveform entirety becomes, simultaneously because of the 3rd electric capacity C3, the 3rd inductance L3, the 4th electric capacity C4 and the 4th
The characteristic of inductance L4 determines, the 3rd electric capacity C3 and the inside of the 3rd inductance L3, the 4th electric capacity C4 and the inside meeting of the 4th inductance L4
Forming certain vibration, this waveform generally conforms to sinusoidal wave rule just (such as the B point voltage waveform in Fig. 7 and C point voltage
Waveform), itself and half alternating current wave are superimposed on the second inductance L2 and substantially can form a preferable band DC component sine wave.
It should be noted that in a concrete example of the present utility model, at least one first harmonic injection unit
The capacitance of 1021 is equal with the capacitance of at least one second harmonic injection unit 1022, and at least one first harmonic injects single
The inductance value of unit 1021 is equal with the inductance value of at least one second harmonic injection unit 1022, i.e. says as shown in Figure 5 and Figure 6,
The capacitance of the 4th electric capacity C4 and the capacitance of the 3rd electric capacity C4 are equal, the inductance value of the 4th inductance L4 and the electricity of the 3rd inductance L3
Inductance value is equal.Thus, it is ensured that half alternating current wave after rectification becomes complete sinusoidal wave form after harmonic injection.
Further, the inductance value of the first inductance L1 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, i.e. says as shown in Figure 5 and Figure 6, and the inductance value of the first inductance L1 is more than the
Four inductance L4 or the inductance value of the 3rd inductance L3.This is because relatively big by the electric current of the first inductance L1, and by the 4th inductance
The electric current of L4 or the 3rd inductance L3 is relatively small, in order to ensure that three synchronizes, need to guarantee the inductance value and the 3rd of the 4th inductance L4
The inductance value of inductance L3 is equal, and the inductance value of the first inductance L1 is more than the 4th inductance L4 or the inductance value of the 3rd inductance L3.
It addition, according to an embodiment of the present utility model, harmonic wave module 102 is by injecting to full-bridge rectification module 101
Harmonic wave, so that the output voltage of harmonic wave module 102 and full-bridge rectification module 101 is superposed to sine voltage, wherein, harmonic injection
The frequency of sinusoidal ac of frequency alternating current power supply 200 offer equal to 8M times, M is 1 or M to be that the even number more than 1, i.e. M can wait
In 1,2,4,6 ....
Specifically, as it is shown in figure 9, the slope of sine voltage after superposition is at the 1/4 of alternating current half period
Will change, can be humorous by the timing definition between two slope turning points of arbitrary neighborhood on the sine voltage after superposition
Ripple injected frequency f, harmonic injection frequency f can be equal to the frequency of the sinusoidal ac of 8 times.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 alternating current frequency such as 50Hz be correlated with, with
Make the harmonic injection frequency ac frequency such as 400Hz equal to 8M times.
Further, the energy storage of the first electric capacity C1 and the second inductance L2 need at least meet resonance circuit 300 at a harmonic period
Interior energy release demand, i.e. says that the type selecting of the first electric capacity C1 and the second inductance L2 is relevant to the resonant parameter of resonance circuit 300,
The energy storage of the first electric capacity C1 and the second inductance L2 wants enough resonance circuits 300 to discharge in a harmonic period.
According to a concrete example of the present utility model, 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 parameter of the 3rd electric capacity C3 and the 4th electric capacity C4 can be configured according to table 1 below,
It should be noted that these parameters can not at will be changed, it is not necessary to multiple proportion can be become.
Table 1
Further, as Figure 4-Figure 6, full-bridge rectification module 101 is connected with alternating current power supply 200 by transformator T1, its
In, primary one end of transformator T1 is connected with one end of alternating current power supply 200, the primary other end of transformator T1 and alternating current
The other end in source 200 is connected, and secondary one end of transformator T1 is connected with the first input end of rectifier bridge 1011, transformator T1's
The secondary other end is connected with the second input of rectifier bridge 1011.
Specifically, transformator T1, for alternating current power supply 200 being isolated with rear class loop, returns forming independent rear class
Road.
To sum up, the power circuit proposed according to this utility model embodiment, add with full-bridge rectification wired in parallel is humorous
Mode block, harmonic wave module superpose with full-bridge rectification module after the lowest point of output voltage more than or equal to zero, and the cycle is alternating current power supply
A kind of fundamental frequency of the half of the sinusoidal ac provided, i.e. output voltage after superposition, thus reduce pan vibration and produce
Raw noise, improves the experience of user.
Utility model this utility model embodiment also proposed a kind of electromagnetic heating circuit, as it is shown on figure 3, Electromagnetic Heating is electric
Road includes: resonance circuit 300, IGBT pipe 400, above-mentioned power circuit 100, drive circuit 500 and control circuit 600.
Wherein, the colelctor electrode of IGBT pipe 400 is connected with resonance circuit 300, the grounded emitter of IGBT pipe 400；Power supply electricity
Road 100 is connected between resonance circuit 300 and alternating current power supply 200；Drive circuit 500 is connected to drive with the grid of IGBT pipe 400
Dynamic IGBT pipe 400 is switched on or off；Control circuit 600 is connected with drive circuit 500, and control circuit 600 is used for controlling to drive electricity
Road 500 is to drive IGBT pipe 400 by drive circuit 500.
Specifically, resonance circuit 300 can include resonant capacitance Cm and heating coil Lm, the resonant capacitance Cm in parallel of parallel connection
Be connected with power circuit 100 with one end of heating coil Lm, resonant capacitance Cm in parallel and the other end of heating coil Lm and
The colelctor electrode of IGBT pipe 400 is connected.
It should be appreciated that electromagnetic heating circuit and the circuit structure of all parts thereof, operation principle belong to prior art,
It is well known to those of ordinary skill in the art, has been in succinct purpose here, repeats no more.
To sum up, the electromagnetic heating circuit proposed according to this utility model embodiment, by above-mentioned power circuit, thus it is possible to vary
Resonance circuit is delivered to the frequency characteristic of the noise of pan, the noise that reduction pan vibrates and produces, and promotes the experience of user.
Finally, this utility model embodiment 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 this utility model embodiment, by arranging above-mentioned electromagnetic heating circuit, can drop
Low equipment noise, promotes the experience of user.
In description of the present utility model, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ", " suitable
Hour hands ", " counterclockwise ", " axially ", " radially ", the orientation of the instruction such as " circumferential " or position relationship be based on orientation shown in the drawings
Or position relationship, be for only for ease of describe this utility model and simplify describe rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
Individual, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, connect for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be
It is mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, unless otherwise clear and definite restriction.Common skill for this area
For art personnel, above-mentioned term concrete meaning in this utility model can be understood as the case may be.
In this utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score
Can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " permissible
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
One or more embodiment in office or example combine in an appropriate manner.Additionally, in the case of the most conflicting, this area
Technical staff the feature of the different embodiments described in this specification or example and different embodiment or example can be entered
Row combines and combination.
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
In above-described embodiment can be changed, revise, replace and modification.
Claims (13)
1. a power circuit, is connected between alternating current power supply and resonance circuit, it is characterised in that including:
Full-bridge rectification module, described full-bridge rectification module carries out rectification for the sinusoidal ac providing described alternating current power supply；
Harmonic wave module, described harmonic wave module and described full-bridge rectification wired in parallel, described harmonic wave module and described full-bridge rectification mould
The output voltage of block is superposed to sine voltage, thinks that described resonance circuit is powered, the lowest point of sine voltage after described superposition
More than or equal to zero, the half of the sinusoidal ac that the cycle provides for described alternating current power supply, and phase place is relative to described alternating current power supply
Sinusoidal ac reach π/4 provided.
Power circuit the most according to claim 1, it is characterised in that described full-bridge rectification module includes:
Rectifier bridge, the first input end of described rectifier bridge is connected with one end of described alternating current power supply, and the second of described rectifier bridge is defeated
Enter end to be connected with the other end of described alternating current power supply, the first output head grounding of described rectifier bridge；
First inductance, one end of described first inductance is connected with the second outfan of described rectifier bridge, described first inductance another
One end is connected with described resonance circuit.
Power circuit the most according to claim 2, it is characterised in that described harmonic wave module includes:
At least one first harmonic injection unit, at least one first harmonic injection unit described is connected in parallel with each other, Mei Ge
One end of one harmonic injection unit is connected with the first input end of described rectifier bridge, described each first harmonic injection unit another
One end is connected with the other end of described first inductance；
At least one second harmonic injection unit, at least one second harmonic injection unit described is connected in parallel with each other, Mei Ge
One end of two harmonic injection unit is connected with the second input of described rectifier bridge, described each second harmonic injection unit another
One end is connected with the other end of described first inductance.
Power circuit the most according to claim 3, it is characterised in that described each first harmonic injection unit includes:
3rd electric capacity, described one end of 3rd electric capacity are connected with the first input end of described rectifier bridge,
3rd inductance, one end of described 3rd inductance are connected with the other end of described 3rd electric capacity, another of described 3rd inductance
End is connected with the other end of described first inductance；Described each second harmonic injection unit includes:
4th electric capacity, described one end of 4th electric capacity are connected with the second input of described rectifier bridge,
4th inductance, one end of described 4th inductance are connected with the other end of described 4th electric capacity, another of described 4th inductance
End is connected with the other end of described first inductance.
Power circuit the most according to claim 4, it is characterised in that at least one first harmonic injection unit the 3rd described
The capacitance of electric capacity is equal with the capacitance of at least one second harmonic injection unit the 4th electric capacity described, described at least one
The inductance value of one harmonic injection unit the 3rd inductance and the inductance value of at least one second harmonic injection unit the 4th inductance described
Equal.
Power circuit the most according to claim 4, it is characterised in that the inductance value of described first inductance more than described at least
The inductance value of one first harmonic injection unit the 3rd inductance and at least one second harmonic injection unit the 4th inductance described
Inductance value.
Power circuit the most according to claim 1, it is characterised in that the frequency of described harmonic wave module output voltage is equal to 8M
The frequency of sinusoidal ac that the most described alternating current power supply provides, M is 1 or M to be the even number more than 1.
Power circuit the most according to claim 1, it is characterised in that also include:
Filtration module, described filtration module is connected between described harmonic wave module and described resonance circuit.
Power circuit the most according to claim 8, it is characterised in that described filtration module includes:
Second inductance, one end of described second inductance is connected with described harmonic wave module, and the other end of described second inductance is with described
Resonance circuit is connected；
First electric capacity, one end of described first electric capacity is connected with one end of described second inductance, the other end of described first electric capacity
Ground connection.
Power circuit the most according to claim 9, it is characterised in that described first electric capacity and the storage of described second inductance
Can at least meet described resonance circuit energy release demand in a harmonic period.
11. 1 kinds of electromagnetic heating circuits, it is characterised in that including:
Resonance circuit；
IGBT manages, and the colelctor electrode of described IGBT pipe is connected with described resonance circuit, the grounded emitter of described IGBT pipe；
According to the power circuit according to any one of claim 1-10, described power circuit is connected to described resonance circuit and institute
State between alternating current power supply；
Drive circuit, described drive circuit is connected with the grid of described IGBT pipe to drive described IGBT pipe to be switched on or off；
Control circuit, described control circuit is connected with described drive circuit, and described control circuit is used for controlling described drive circuit.
12. electromagnetic heating circuits according to claim 11, it is characterised in that described resonance circuit includes the resonance of parallel connection
Electric capacity and heating coil, the resonant capacitance of described parallel connection is connected with described power circuit with one end of heating coil, described parallel connection
Resonant capacitance with heating coil the other end be connected with the colelctor electrode of described IGBT pipe.
13. 1 kinds of electromagnetic heating apparatus, it is characterised in that include according to the electromagnetic heating circuit described in claim 11 or 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620428445.4U CN205657594U (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 |
|---|---|---|---|
| CN201620428445.4U CN205657594U (en) | 2016-05-11 | 2016-05-11 | Power supply circuit , electromagnetic heating circuit and electromagnetic heating equipment |
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| CN205657594U true CN205657594U (en) | 2016-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620428445.4U Active CN205657594U (en) | 2016-05-11 | 2016-05-11 | Power supply circuit , electromagnetic heating circuit and electromagnetic heating equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462905A (en) * | 2018-09-17 | 2019-03-12 | 浙江绍兴苏泊尔生活电器有限公司 | Time-sharing power supply circuit and method and electromagnetic heating appliance |
-
2016
- 2016-05-11 CN CN201620428445.4U patent/CN205657594U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462905A (en) * | 2018-09-17 | 2019-03-12 | 浙江绍兴苏泊尔生活电器有限公司 | Time-sharing power supply circuit and method and electromagnetic heating appliance |
| CN109462905B (en) * | 2018-09-17 | 2021-03-30 | 浙江绍兴苏泊尔生活电器有限公司 | Time-sharing power supply circuit and method and electromagnetic heating appliance |
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