CN107306461A - Power circuit and electromagnetic heater - Google Patents
Power circuit and electromagnetic heater Download PDFInfo
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- CN107306461A CN107306461A CN201610269256.1A CN201610269256A CN107306461A CN 107306461 A CN107306461 A CN 107306461A CN 201610269256 A CN201610269256 A CN 201610269256A CN 107306461 A CN107306461 A CN 107306461A
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- pfc
- power circuit
- bridge rectifier
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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 present invention discloses a kind of power circuit, is powered for the LC resonance circuits to electromagnetic heater, the power circuit includes：Bridge rectifier, the input of the bridge rectifier is connected with AC power；And PFC (power factor correction, PFC) circuit, the input of the pfc circuit is connected with the output end of the bridge rectifier, and the output end of the pfc circuit is connected with the LC resonance circuits；The pfc circuit is used to reject the low-order harmonic of rectified voltage and corrects the power factor of the power circuit.The present invention also provides a kind of electromagnetic heater.The power circuit and electromagnetic heater of embodiment of the present invention can reject the low-order harmonic of rectified voltage due to pfc circuit, therefore the resonance current of LC resonance circuits can be avoided low-order harmonic occur, can avoid noise of the pan caused by low-order harmonic.In addition, pfc circuit can also improve the power factor of power circuit, the power of power circuit is improved.
Description
Technical field
The present invention relates to living electric apparatus field, more particularly to a kind of power circuit and electromagnetic heater.
Background technology
Referring to Fig. 1, existing electromagnetic oven uses mains-supplied.Power circuit includes bridge rectifier, High frequency filter
Electric capacity, choke coil, Large Copacity storage capacitor and LC resonance circuits.During work, civil power pass sequentially through bridge rectifier,
Acted on after high-frequency filter capacitor, choke coil and Large Copacity storage capacitor on LC resonance circuits.Wherein, LC resonance circuits
Resonance current is produced under the control of ON-OFF control circuit, the coil panel of LC resonance circuits produces periodically variable magnetic field,
Magnetic field acts on pan bottom (the bottom of a pan) through micro-crystal plate, the bottom of a pan is produced eddy-current heating, so as to realize heating.
Typically it is made currently used for the pan of electromagnetic oven of 430 stainless steels, 430 stainless steels have certain ferromagnetism,
Therefore, the magnetic field that coil panel is produced can magnetize the bottom of a pan, and magnetic fields meeting and line of the bottom of a pan after magnetizing by coil panel
Enclose disk attracting.Disappeared moment in the magnetic field of coil panel, magnetic force disappears, but pan vortex produces magnetic field, and pole again simultaneously
Property is identical with the polarity of the magnetic field of coil panel, therefore pan repels each other with coil panel.In other words, in heating process, pan
With coil panel it is constantly attracting, repel each other, ultimately result in pan vibration and produce noise, attraction and repulsive force size and coil
The transient resonance electric current of disk is into positive correlation.Therefore, the frequency characteristic of the resonance current of coil panel can be eventually transferred to pan
Noise properties on.
However, for existing power circuit, civil power can produce multiple harmonic after bridge rectifier, although high frequency
Filter capacitor can filter out higher hamonic wave and city's electrical noise, but rectified voltage still includes low-order harmonic.Therefore, can be with
The capacitance of Large Copacity storage capacitor is improved, low-order harmonic is filtered out so that output voltage is more smooth.However, Large Copacity is stored up
Energy electric capacity can raise the voltage of the output end of bridge rectifier, cause civil power only in instantaneous voltage higher than bridge rectifier electricity
During the voltage of the output end on road, the diode of bridge rectifier is just turned on, in other words, only near the peak value of civil power
The diode of bridge rectifier is just turned on, and causes rectified current spike occur, be there is multiple harmonic, is equally led
Cause the noise problem of pan.In addition, the capacitance for improving Large Copacity storage capacitor again results in bridge rectifier and held
Property load, cause the power factor of power circuit to decline.Therefore, chokes can be set in the front end of Large Copacity storage capacitor
Circle, the instantaneous mutation of rectified current is contained using choke coil, and compensates power factor.However, choke coil is as simple
Indemnifying measure, effect is unsatisfactory.Output current still suffers from low-order harmonic, and power factor can not also be compensated in place.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art.Therefore, the present invention provides a kind of driving
Circuit and electromagnetic heater.
The power circuit of embodiment of the present invention, powers for the LC resonance circuits to electromagnetic heater, the power supply
Circuit includes：
Bridge rectifier, the input of the bridge rectifier is connected with AC power；And
PFC (power factor correction, PFC) circuit, the input of the pfc circuit and the bridge
The output end connection of formula rectification circuit, the output end of the pfc circuit is connected with the LC resonance circuits；The PFC
Circuit is used to reject the low-order harmonic of rectified voltage and corrects the power factor of the power circuit.
In some embodiments, the pfc circuit includes：
Absorption inductor, one end of the absorption inductor is connected with the output end of the bridge rectifier；
Commutation diode, the anode of the commutation diode is connected with the other end of the absorption inductor, the pole of rectification two
The negative electrode of pipe is connected with the LC resonance circuits；
Large Copacity storage capacitor, described Large Copacity storage capacitor one end is connected with the negative electrode of the commutation diode, the other end
Ground connection, the Large Copacity storage capacitor is used to filter out the low-order harmonic of the rectified voltage to export lifting DC voltage；
Switching tube a, connection end of the switching tube is connected with the anode of the commutation diode, another connection termination
Ground；And
Control chip, the control chip is connected with the control end of the switching tube, for controlling described two connection ends
Conducting is with disconnecting so as to compensate the power factor of the power circuit.
In some embodiments, the capacitance of the Large Copacity storage capacitor is more than 1000uF.
In some embodiments, the pfc circuit includes：
Absorption inductor, one end of the absorption inductor is connected with the output end of the bridge rectifier；
Commutation diode, the anode of the commutation diode is connected with the other end of the absorption inductor, the pole of rectification two
The negative electrode of pipe is connected with the LC resonance circuits；
Large Copacity storage capacitor, described Large Copacity storage capacitor one end is connected with the negative electrode of the commutation diode, the other end
Ground connection；
Switching tube a, connection end of the switching tube is connected with the anode of the commutation diode, another connection termination
Ground；
Control chip, the control chip is connected with the control end of the switching tube；And
Pid algorithm device, the pid algorithm device connects the input and output end and the PFC of the bridge rectifier
The output end of circuit is to gather the output voltage of the voltage, the rectified voltage and the pfc circuit of the AC power
So as to control the conducting of described two connection ends with disconnecting so as to change PFC output waveforms and cause output voltage in sine
Waveform.
In some embodiments, the power circuit includes the second commutation diode, the sun of second commutation diode
Pole is connected with the input of the bridge rectifier diode, and negative electrode is connected with the pid algorithm device.
In some embodiments, the capacitance of the Large Copacity storage capacitor is more than 1-10uF.
In some embodiments, the pfc circuit includes：Protection diode, the anode of the protection diode and institute
The input connection of pfc circuit is stated, negative electrode is connected with the output end of the pfc circuit.
In some embodiments, the power circuit include high-frequency filter capacitor, one end of the high-frequency filter capacitor with
The output end connection of the bridge rectifier, other end ground connection, higher hamonic wave and exchange for filtering out rectified voltage
The noise of power supply.
The electromagnetic heater of embodiment of the present invention includes：
LC resonance circuits；And
The power circuit, the power circuit is used to power to the LC resonance circuits.
In some embodiments, the electromagnetic heater includes electromagnetic oven, electric cooker or electric pressure cooker.
The power circuit and electromagnetic heater of embodiment of the present invention can reject rectified voltage due to pfc circuit
Low-order harmonic, therefore the resonance current of LC resonance circuits can be avoided low-order harmonic occur, pan can be avoided because of low order
The noise that harmonic wave is caused.In addition, pfc circuit can also improve the power factor of power circuit, the work(of power circuit is improved
Rate.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Substantially, or by the practice of the present invention recognize.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention can be incited somebody to action from the description with reference to accompanying drawings below to embodiment
Become substantially and be readily appreciated that, wherein：
Fig. 1 is the circuit diagram of the electromagnetic heater of prior art.
Fig. 2 is the circuit diagram of the electromagnetic heater of embodiment of the present invention.
Fig. 3 is the circuit diagram of the electromagnetic heater of another embodiment of the invention.
Embodiment
Embodiments of the present invention are described below in detail, the example of embodiment is shown in the drawings, wherein, identical or class
As label represent same or similar element or the element with same or like function from beginning to end.
The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining of the invention, and it is not intended that
Limitation of the present invention.
Referring to Fig. 2, the power circuit of embodiment of the present invention, for the LC resonance circuits confession to electromagnetic heater
Electricity.Power circuit includes bridge rectifier and PFC (power factor correction, PFC) circuit.
The input of bridge rectifier is connected with AC power.The output of the input and bridge rectifier of pfc circuit
End connection, the output end of pfc circuit is connected with LC resonance circuits.Pfc circuit is used for the low order for rejecting rectified voltage
The power factor of harmonic wave and calibration power supply circuit.
The power circuit of embodiment of the present invention can reject the low-order harmonic of rectified voltage due to pfc circuit, therefore can
To avoid the resonance current of LC resonance circuits from low-order harmonic occur, noise of the pan caused by low-order harmonic can be avoided.
In addition, pfc circuit can also improve the power factor of power circuit, the power of power circuit is improved.
Bridge rectifier include two inputs, two output ends and by predetermined bias mode be connected to two inputs and
Four commutation diodes between two output ends.
AC power can be civil power, for example, 220 volts, 50 hertz of single-phase sinusoidal voltage.AC power also may be used
To be the civil power by transformation, to meet use requirement.Certainly, AC power can also be by other specially treateds
Civil power, for example, AC power is the civil power by EMC circuits.
AC power includes two output ends, is connected respectively with two inputs of bridge rectifier.And bridge rectifier is electric
One output head grounding on road, another output end as bridge rectifier output end.
Sinusoidal voltage will produce multiple harmonic after bridge rectifier, for example, frequency is 100 hertz of integral multiples
Harmonic wave.
In some embodiments, pfc circuit includes absorption inductor, commutation diode, Large Copacity storage capacitor, switch
Pipe and control chip.
One end of absorption inductor is connected as the input of pfc circuit and the output end of bridge rectifier.Commutation diode
Anode and the other end of absorption inductor connect, the negative electrode of commutation diode is connected with LC resonance circuits.Large Copacity energy storage
The negative electrode connection of electric capacity one end and commutation diode, other end ground connection, Large Copacity storage capacitor is used to filter out rectified voltage
Low-order harmonic to export lifting DC voltage.One connection end of switching tube and the anode of commutation diode are connected, another
Individual connection end ground connection.The control end of control chip and switching tube, for controlling the conducting of two connection ends with disconnecting so as to mend
Repay the power factor of power circuit.
Because lifting DC voltage does not include exchange spectrum component, therefore, and in the absence of multiple harmonic, so as to avoid
The pan noise problem caused by multiple harmonic.
Specifically, during work, control chip produces pulsewidth modulation (pulse width modulation, PWM) signal to control
The conducting and disconnection of switching tube.In the ON time of switching tube, rectified voltage is grounded by absorption inductor and switching tube,
Rectified current charges to absorption inductor, absorption inductor energy storage, and Large Copacity storage capacitor discharges and carried to LC resonance circuits
Voltage supplied, commutation diode prevents the discharge current of Large Copacity storage capacitor from flowing back to power end.And in the disconnection of switching tube
Time, absorption inductor electric discharge is charged, and supplied to LC resonance circuits together with rectified voltage to Large Copacity storage capacitor
Electricity.Because absorption inductor can be with equivalent into the power supply connected with AC power, power circuit is of virtually boost effect,
Increase the discharge voltage of absorption inductor i.e. on the basis of rectified voltage.For example, in some embodiments, passing through choosing
Suitable absorption inductor is selected, in the case where AC power is 220 volts, the output voltage of power circuit can be caused 310
Volt.
As discussed earlier, the low-order harmonic due to Large Copacity storage capacitor for filtering out rectified voltage, for example, 100,
200th, 300,400,500,600 hertz of harmonic wave.Therefore, Large Copacity storage capacitor need to possess than larger capacitance.
Specifically, the capacitance of Large Copacity storage capacitor can be determined by the energy storage formula of electric capacity according to demand, i.e.,：
I0/ωC0<ΔU
Wherein, I0For load current；ω is the angular frequency of pfc circuit, i.e. the π f of ω=2；C0As Large Copacity storage capacitor
Capacitance, Δ U be voltage ripple.
In some embodiments, the power of electromagnetic heater is 1000-2000 watts, then the storage of Large Copacity storage capacitor
The energy deposited need to meet 2000 watts of power demand, and as an example, output voltage is 310 volts, it is possible to infer
Load current is：
I0=2000W/310V=6.5A
Voltage ripple is generally 10V or so, therefore is estimated as 10V.
Frequency after AC power rectification is 100Hz, and therefore, the angular frequency of pfc circuit is：
The π f=2 π * 100=200 π of ω=2
To sum up, the capacitance that can calculate Large Copacity storage capacitor is：
C0>1035uF
Capacitance in view of the actual specification and precision of electric capacity, therefore setting Large Copacity storage capacitor is more than 1000uF.
Absorption inductor, commutation diode, switching tube and control chip constitute chopper circuit.Chopper circuit is equivalent to switch
Circuit, cuts into rectified voltage by switching repeatedly the square wave of a string of high frequencies so that rectified current can track rectification
The change of voltage afterwards, so that the power factor (PF) of calibration power supply circuit.
The square wave of high frequency turns into lifting DC voltage after being integrated by Large Copacity storage capacitor.
In some embodiments, pfc circuit includes protection diode, the anode of protection diode and pfc circuit it is defeated
Enter end connection, the output end connection of negative electrode and pfc circuit.
The bypass of protection diode formation choke coil, in addition, another branch road also is provided to the charging of Large Copacity storage capacitor,
In this way, can prevent that flowing through choke coil in startup instantaneous large-current causes saturation, damages switching tube；In addition, also can be upper
In electric process, make Large Copacity storage capacitor more charging quickly, set up the balance of voltage.
In some embodiments, power circuit includes high-frequency filter capacitor, one end of high-frequency filter capacitor and bridge rectifier
The output end connection of circuit, other end ground connection, for filtering out the higher hamonic wave of rectified voltage and the noise of AC power.
In this way, power circuit can filter out the higher hamonic wave in rectified voltage, so as to be filtered out completely together with pfc circuit
The multiple harmonic of rectified voltage.
Referring to Fig. 3, in some embodiments, pfc circuit includes absorption inductor, commutation diode, Large Copacity storage
Can electric capacity, switching tube, control chip and pid algorithm device.
One end of absorption inductor is connected as the input of pfc circuit and the output end of bridge rectifier.Commutation diode
Anode and the other end of absorption inductor connect, the negative electrode of commutation diode is connected with LC resonance circuits.Large Copacity energy storage
The negative electrode connection of electric capacity one end and commutation diode, other end ground connection, Large Copacity storage capacitor one end and commutation diode
Negative electrode is connected, other end ground connection.One connection end of switching tube and the anode of commutation diode are connected, another connection end
Ground connection.The control end connection of control chip and switching tube.The input of pid algorithm device connection bridge rectifier and output
The output end of end and pfc circuit is to gather the output voltage of AC power, rectified voltage and pfc circuit so as to controlling
The conducting of two connection ends is with disconnecting so as to change PFC output waveforms and cause output voltage to be in sinusoidal waveform.
Because the output voltage of power circuit is into sinusoidal waveform, therefore in the absence of multiple harmonic, so as to avoid because repeatedly
Pan noise problem caused by harmonic wave.
Specifically, during work, the parameter of the sinusoidal waveform of the output voltage obtained can will be needed to be pre-stored in PID in advance and calculated
Musical instruments used in a Buddhist or Taoist mass.Pid algorithm device refers to be based on ratio, integration, differential (Proportion Integral and Derivative, PID)
The controller of algorithm.The output electricity of voltage, rectified voltage and power circuit that pid algorithm device passes through Sample AC power supply
Pressure, is then calculated by pid algorithm and obtains obtaining the pwm signal needed for the output voltage of sinusoidal waveform that prestores, and
Control control chip produces corresponding pwm signal accordingly, the sine wave so that conducting of controlling switch pipe and disconnection acquisition prestore
The output voltage of shape.
Pid algorithm system is a kind of linear regulation system, and it is by the ratio of set-point r (t) and real output value c (t) deviation
(P), integration (I), differential (D) constitute controlled quentity controlled variable u (t) by linear combination, and control object is controlled.
Controlled quentity controlled variable u (t) can be expressed as in pid algorithm system：
E (t)=r (t)-c (t) in formula, Kp represent proportionality coefficient, and TI represents integration time constant, when TD represents differential
Between constant.
Pid algorithm system includes proportion adjustment link, integral adjustment link and differential governing loop.Wherein proportion adjustment
The deviation signal e (t) of link proportionally reaction control system, deviation then produce control action to subtract immediately once producing
Little deviation.Integral adjustment link be mainly used in eliminate net difference, improve system without margin.The power of integral action is depended on
Integration time constant TI, TI is bigger, and integral action is weaker, on the contrary then stronger.Differential governing loop energy stock dividends are believed
Number variation tendency (rate of change), and one can be introduced in systems effectively before the value of deviation signal becomes too big
Early stage revise signal, so as to accelerate the responsiveness of system, reduce regulating time.
In some embodiments, pid algorithm device has applied to the discrete form of above-mentioned pid algorithm.Controlled quentity controlled variable U (k)
Act on the PWM of control chip.Controlled quentity controlled variable U (k) discrete form can be expressed as：
Wherein：Kp、Ki、KdProportionality coefficient, integral coefficient, differential coefficient are represented respectively.These coefficients can basis
Set and constantly improved by technologies such as machine learning during test and use the need for power circuit.E (k) is
The deviation of the voltage of AC power and the output voltage of power circuit.
In some embodiments, it is only necessary to apply to proportional and differential term, thus above-mentioned formula can be reduced to：
U (k)=Kpe(k)+Kd[e(k)-e(k-1)]
By pid algorithm produce corresponding controlled quentity controlled variable U (k) act on control chip with produce corresponding pwm signal and then
The conducting of controlling switch pipe and the multiple harmonic for disconnecting and finally filtering out rectified voltage.As e (k)=0, power circuit
Output pressure is consistent with the voltage of AC power, and now DC voltage successful conversion is for sine voltage.
Absorption inductor, commutation diode, switching tube, control chip and pid algorithm device constitute chopper circuit.Copped wave electricity
Rectified voltage is cut into the square wave of a string of high frequencies by switching repeatedly so that rectified current equivalent to on-off circuit in road
The change of rectified voltage can be tracked, so that the power factor (PF) of calibration power supply circuit.
The square wave of high frequency turns into the output voltage of sinusoidal waveform after being integrated by Large Copacity storage capacitor.
By taking 2000W as an example, in addition by taking the frequency 25KHz of the pwm signal of controlling switch pipe as an example, i.e., switching tube is opened
25us, closes 25us, opens 25us consumption 2000*25*10-6=0.05J energy.Because electromagnetism electric capacity energy storage formula is：
W=C*V2/2
Due to V=310V, therefore it can calculate：
C≈1uf。
In order to provide enough energy, and in view of the actual specification and precision of electric capacity, therefore set Large Copacity storage capacitor
Capacitance be more than 1uf or so.
Furthermore, it is contemplated that the capacitance of Large Copacity storage capacitor, which crosses conference, causes deformed sine wave, therefore, based on experience value,
The capacitance of Large Copacity storage capacitor is less than 10uf.
In some embodiments, the power circuit include the second commutation diode, the anode of the second commutation diode with
The input connection of bridge rectifier diode, negative electrode is connected with pid algorithm device.
In this way, the electric current backflow telegram in reply source of sampled voltage can be prevented.
In some embodiments, electromagnetic heater can be that other electromagnetism such as electric cooker, electromagnetic oven or electric pressure cooking saucepan add
Hot equipment.
Electromagnetic heater can include power circuit, LC resonance circuits and ON-OFF control circuit.
LC resonance circuits include the resonant capacitance and coil panel being arranged in parallel.ON-OFF control circuit includes switching tube, driving
Circuit and controller.Controller is used to produce pwm signal, and drive circuit is used to be turned on according to PWM controlling switches pipe
Or disconnect.
One end of LC resonance circuits and the output end of power circuit are connected, and the other end is connected with ON-OFF control circuit.Power supply
Circuit provides output voltage, and ON-OFF control circuit controls the connection and disconnection between LC resonance circuits and output voltage,
So that LC resonance circuits produce resonance current, coil panel produces periodically variable magnetic field, and magnetic field passes through micro-crystal plate
Pan bottom (the bottom of a pan) is acted on, the bottom of a pan is produced eddy-current heating, so as to realize heating.
In the description of embodiments of the present 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 ", " clockwise ", " counterclockwise " etc.
The orientation or position relationship of instruction are, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention's
Embodiment and simplified description, rather than instruction or the signified device of hint or element must have specific orientation, Yi Te
Fixed azimuth configuration and operation, therefore it is not intended that limitation to embodiments of the present invention.In addition, term " first ",
" second " is only used for describing purpose, and it is not intended that indicating or implying relative importance or implicit indicate indicated
The quantity of technical characteristic.Thus, " first " is defined, the feature of " second " can express or implicitly include one
Individual or more described features.In the description of embodiments of the present invention, " multiple " are meant that two or two
More than, unless otherwise specifically defined.
, it is necessary to illustrate in the description of embodiments of the present invention, unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or removable
Connection is unloaded, or is integrally connected；It can be mechanical connection or electrical connection or can mutually communicate；Can be straight
Connect connected, can also be indirectly connected to by intermediary, can be two element internals connection or two elements it is mutual
Interactively.For the ordinary skill in the art, above-mentioned term can be understood in the present invention as the case may be
Embodiment in concrete meaning.
In embodiments of the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on "
Or it " under " can directly be contacted including the first and second features, it is not directly to connect that can also include the first and second features
Touch but pass through the other characterisation contact between them.Moreover, fisrt feature second feature " on ", " top "
The fisrt feature " above " that includes is directly over second feature and oblique upper, or to be merely representative of fisrt feature level height high
In second feature.Fisrt feature second feature " under ", " lower section " and " below " include fisrt feature second
Directly over feature and oblique upper, or fisrt feature level height is merely representative of less than second feature.
Following disclosure provides many different embodiments or example is used for realizing the difference of embodiments of the present invention
Structure.In order to simplify the disclosure of embodiments of the present invention, hereinafter the part and setting of specific examples are described.
Certainly, they are only merely illustrative, and purpose does not lie in the limitation present invention.In addition, embodiments of the present invention can be
Repeat reference numerals and/or reference letter in different examples, this repetition are that for purposes of simplicity and clarity, itself is not
Indicate the relation between various embodiments are discussed and/or set.In addition, embodiments of the present invention provide it is various
The example of specific technique and material, but those of ordinary skill in the art can be appreciated that other techniques application and/or its
The use of his material.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically
The description of embodiment ", " example ", " specific example " or " some examples " etc. means with reference to the embodiment
Or specific features, structure, material or the feature of example description are contained at least one embodiment or example of the present invention
In.In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.And
And, specific features, structure, material or the feature of description can be in any one or more embodiments or example
Combine in an appropriate manner.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes one
Module, fragment or the portion of individual or more the code for executable instruction the step of realizing specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by shown or discussion
Sequentially, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be by
Embodiments of the invention person of ordinary skill in the field is understood.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered is used for
The order list of the executable instruction of logic function is realized, be may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processing module or other can be from
The system of instruction execution system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems,
Device or equipment and use.For the purpose of this specification, " computer-readable medium " can be it is any can include, store,
Communication, propagation or transmission procedure are for instruction execution system, device or equipment or combine these instruction execution systems, device
Or equipment and the device that uses.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Have
The electrical connection section (electronic installation) of one or more wirings, portable computer diskette box (magnetic device), random access memory
(RAM), read-only storage (ROM), erasable edit read-only storage (EPROM or flash memory), optical fiber dress
Put, and portable optic disk read-only storage (CDROM).In addition, can even is that can be thereon for computer-readable medium
Print the paper or other suitable media of described program because can for example by carrying out optical scanner to paper or other media,
Then enter edlin, interpret or handled electronically to obtain described program with other suitable methods if necessary, so
After store it in computer storage.
It should be appreciated that each several part of embodiments of the present invention can be with hardware, software, firmware or combinations thereof come real
It is existing.In the above-described embodiment, multiple steps or method can perform system in memory and by suitable instruction with storage
Unite the software performed or firmware is realized.If, and in another embodiment, can for example, realized with hardware
Realized with any one of following technology well known in the art or their combination：With for patrolling data-signal realization
The discrete logic of the logic gates of function is collected, the application specific integrated circuit with suitable combinational logic gate circuit can
Program gate array (PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
It can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in various embodiments of the present invention can be integrated in a processing module, can also
That unit is individually physically present, can also two or more units be integrated in a module.It is above-mentioned integrated
Module can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated mould
If block is realized using in the form of software function module and as independent production marketing or in use, can also be stored in one
In computer read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..
Although embodiments of the present invention have been shown and described above, it is to be understood that above-mentioned embodiment is to show
Example property, it is impossible to be interpreted as limitation of the present invention, one of ordinary skill in the art within the scope of the invention can be right
Above-mentioned implementation is implemented be changed, change, replacing and modification.
Claims (10)
1. a kind of power circuit, powers, it is characterised in that the electricity for the LC resonance circuits to electromagnetic heater
Source circuit includes：
Bridge rectifier, the input of the bridge rectifier is connected with AC power；And
PFC (power factor correction, PFC) circuit, the input of the pfc circuit and the bridge
The output end connection of formula rectification circuit, the output end of the pfc circuit is connected with the LC resonance circuits；The PFC
Circuit is used to reject the low-order harmonic of rectified voltage and corrects the power factor of the power circuit.
2. power circuit as claimed in claim 1, it is characterised in that the pfc circuit includes：
Absorption inductor, one end of the absorption inductor is connected with the output end of the bridge rectifier；
Commutation diode, the anode of the commutation diode is connected with the other end of the absorption inductor, the pole of rectification two
The negative electrode of pipe is connected with the LC resonance circuits；
Large Copacity storage capacitor, described Large Copacity storage capacitor one end is connected with the negative electrode of the commutation diode, the other end
Ground connection, the Large Copacity storage capacitor is used to filter out the low-order harmonic of the rectified voltage to export lifting DC voltage；
Switching tube a, connection end of the switching tube is connected with the anode of the commutation diode, another connection termination
Ground；And
Control chip, the control chip is connected with the control end of the switching tube, for controlling described two connection ends
Conducting is with disconnecting so as to compensate the power factor of the power circuit.
3. power circuit as claimed in claim 2, it is characterised in that the capacitance of the Large Copacity storage capacitor is more than
1000uF。
4. power circuit as claimed in claim 1, it is characterised in that the pfc circuit includes：
Absorption inductor, one end of the absorption inductor is connected with the output end of the bridge rectifier；
Commutation diode, the anode of the commutation diode is connected with the other end of the absorption inductor, the pole of rectification two
The negative electrode of pipe is connected with the LC resonance circuits；
Large Copacity storage capacitor, described Large Copacity storage capacitor one end is connected with the negative electrode of the commutation diode, the other end
Ground connection；
Switching tube a, connection end of the switching tube is connected with the anode of the commutation diode, another connection termination
Ground；
Control chip, the control chip is connected with the control end of the switching tube；And
Pid algorithm device, the pid algorithm device connects the input and output end and the PFC of the bridge rectifier
The output end of circuit is to gather the output voltage of the voltage, the rectified voltage and the pfc circuit of the AC power
So as to control the conducting of described two connection ends with disconnecting so as to change PFC output waveforms and cause output voltage in sine
Waveform.
5. power circuit as claimed in claim 4, it is characterised in that the power circuit includes the second commutation diode,
The anode of second commutation diode is connected with the input of the bridge rectifier diode, negative electrode and the pid algorithm
Device is connected.
6. power circuit as claimed in claim 4, it is characterised in that the capacitance of the Large Copacity storage capacitor is more than
1-10uF。
7. the power circuit as described in claim 2-6 any one, it is characterised in that the pfc circuit includes：
Protection diode, the anode of the protection diode is connected with the input of the pfc circuit, negative electrode with it is described
The output end connection of pfc circuit.
8. the power circuit as described in claim 2-6 any one, it is characterised in that the power circuit includes high frequency
Filter capacitor, one end of the high-frequency filter capacitor is connected with the output end of the bridge rectifier, other end ground connection,
For filtering out the higher hamonic wave of rectified voltage and the noise of AC power.
9. a kind of electromagnetic heater, it is characterised in that including：
LC resonance circuits；And
Power circuit as described in claim 1-8 any one, the power circuit is used for the LC resonance circuits
Power supply.
10. power circuit generation device as claimed in claim 9, it is characterised in that the electromagnetic heater includes
Electromagnetic oven, electric cooker or electric pressure cooker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610269256.1A CN107306461B (en) | 2016-04-25 | 2016-04-25 | Power supply circuit and electromagnetic heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610269256.1A CN107306461B (en) | 2016-04-25 | 2016-04-25 | Power supply circuit and electromagnetic heating device |
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| CN107306461A true CN107306461A (en) | 2017-10-31 |
| CN107306461B CN107306461B (en) | 2021-05-25 |
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| CN201610269256.1A Active CN107306461B (en) | 2016-04-25 | 2016-04-25 | Power supply circuit and electromagnetic heating device |
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| CN1117782A (en) * | 1993-12-09 | 1996-02-28 | 摩托罗拉照明公司 | Electronic ballast with two transistors and two transformers |
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| CN1117782A (en) * | 1993-12-09 | 1996-02-28 | 摩托罗拉照明公司 | Electronic ballast with two transistors and two transformers |
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