CN107371287B - 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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- CN107371287B CN107371287B CN201610312751.6A CN201610312751A CN107371287B CN 107371287 B CN107371287 B CN 107371287B CN 201610312751 A CN201610312751 A CN 201610312751A CN 107371287 B CN107371287 B CN 107371287B
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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
Abstract
The invention discloses a power supply circuit, an electromagnetic heating circuit and an electromagnetic heating device, wherein the power supply circuit comprises: the power supply circuit is connected between an alternating current power supply and a resonance circuit, and includes: the full-bridge rectification module is used for rectifying alternating current provided by the alternating current power supply; the harmonic module, the harmonic module with the full-bridge rectifier module is parallelly connected, the harmonic module with the output voltage stack of full-bridge rectifier module is sine wave voltage, for the resonant circuit power supply, the bottom of valley more than or equal to zero of sine wave voltage after the stack, the cycle does half of the sine alternating current that alternating current power supply provided. From this, through increasing the harmonic module parallelly connected with full-bridge rectifier module to the sinusoidal wave voltage who exports alternating current power supply converts the single fundamental frequency sinusoidal wave voltage that the bottom of a valley is greater than zero, can change the frequency characteristic of the noise that resonant circuit transmitted the pan, reduces the pan vibration and the noise that produces.
Description
Technical Field
The invention relates to the technical field of electric appliances, in particular to a power supply circuit, an electromagnetic heating circuit and electromagnetic heating equipment.
Background
Relevant electromagnetic heating device for example electromagnetism stove uses the commercial power supply, and the commercial power becomes half-wave alternating current after through full-bridge rectification, and wherein, half-wave alternating current includes the frequency component of fundamental frequency 100Hz and each order doubling of frequency, and this half-wave alternating current further converts the electric current that contains the same frequency component to on finally transmitting the pan noise through coil panel magnetic field coupling, make the user feel noisy, experience effect obviously descends. However, the related art cannot eliminate rectified direct current fundamental wave and harmonic component, and further cannot reduce the noise of the cookware.
Therefore, improvements are needed in the related art.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a power circuit capable of reducing heating noise of a pot.
Another object of the present invention is to provide an electromagnetic heating circuit. It is a further object of the invention to propose an electromagnetic heating device.
To achieve the above object, an embodiment of an aspect of the present invention provides a power circuit connected between an ac power source and a resonant circuit, including: the full-bridge rectification module is used for rectifying the sine alternating current provided by the alternating current power supply; the harmonic module, the harmonic module with the full-bridge rectifier module is parallelly connected, the harmonic module with the output voltage stack of full-bridge rectifier module does, for the resonant circuit power supply, the valley bottom more than or equal to zero of sine wave voltage after the stack, the cycle does half of the sinusoidal alternating current that alternating current power supply provided.
According to the power supply circuit provided by the embodiment of the invention, the harmonic module connected with the full-bridge rectifier module in parallel is added, the valley bottom of the output voltage after the harmonic module and the full-bridge rectifier module are overlapped is more than or equal to zero, and the period of the output voltage is half of the sinusoidal alternating current provided by the alternating current power supply, namely the overlapped output voltage only has one fundamental frequency and does not have currents with other frequencies, so that the noise generated by the vibration of the cooker is reduced, and the user experience is improved.
According to an embodiment of the invention, the full-bridge rectifier module comprises: a first input end of the rectifier bridge is connected with one end of the alternating current power supply, a second input end of the rectifier bridge is connected with the other end of the alternating current power supply, and a first output end of the rectifier bridge is grounded; and one end of the first inductor is connected with the second output end of the rectifier bridge, and the other end of the first inductor is connected with the harmonic module.
According to one embodiment of the invention, the harmonic module comprises: the first harmonic injection units are connected in parallel, one end of each first harmonic injection unit is connected with the first input end of the rectifier bridge, and the other end of each first harmonic injection unit is connected with the other end of the first inductor; the second harmonic injection units are connected in parallel, one end of each second harmonic injection unit is connected with the second input end of the rectifier bridge, and the other end of each second harmonic injection unit is connected with the other end of the first inductor.
According to an embodiment of the present invention, each of the first harmonic injection units includes: one end of a third capacitor and one end of the third capacitor are connected with the first input end of the rectifier bridge, one end of a third inductor and one end of the third inductor are connected with the other end of the third capacitor, and the other end of the third inductor is connected with the other end of the first inductor; each of the second harmonic injection units includes: one end of the fourth capacitor is connected with the second input end of the rectifier bridge, one end of the fourth inductor is connected with the other end of the fourth capacitor, and the other end of the fourth inductor is connected with the other end of the first inductor.
According to an embodiment of the present invention, a capacitance value of the third capacitor of at least one of the first harmonic injection units is equal to a capacitance value of the fourth capacitor of the second harmonic injection unit, and an inductance value of the third inductor of at least one of the first harmonic injection units is equal to an inductance value of the fourth inductor of the second harmonic injection unit.
According to an embodiment of the invention, an inductance value of the first inductor is larger than an inductance value of a third inductor of at least one of the first harmonic injection units and an inductance value of a fourth inductor of at least one of the second harmonic injection units.
According to one embodiment of the invention, the frequency of the harmonic module output voltage is equal to 8M times the frequency of the sinusoidal alternating current provided by the alternating current power supply, M being 1 or M being an even number greater than 1.
According to an embodiment of the present invention, the power circuit further includes: a filtering module connected between the harmonic module and the resonant circuit.
According to one embodiment of the invention, the filtering module comprises: one end of the second inductor is connected with the harmonic module, and the other end of the second inductor is connected with the resonant circuit; and one end of the first capacitor is connected with one end of the second inductor, and the other end of the first capacitor is grounded.
According to an embodiment of the present invention, the energy stored by the first capacitor and the second inductor at least meets the energy release requirement of the resonant circuit in one resonant period.
In order to achieve the above object, an electromagnetic heating circuit according to another embodiment of the present invention includes: a resonant circuit; the collector of the IGBT tube is connected with the resonance circuit, and the emitter of the IGBT tube is grounded; the power supply circuit is connected between the resonance circuit and the alternating current power supply; the driving circuit is connected with the grid electrode of the IGBT tube to drive the IGBT tube to be switched on or switched off; and the control circuit is connected with the driving circuit and is used for controlling the driving circuit.
According to the electromagnetic heating circuit provided by the embodiment of the invention, through the power supply circuit, the frequency characteristic of noise transmitted to a cooker by the resonance circuit can be changed, the noise generated by the vibration of the cooker is reduced, and the user experience is improved.
According to one embodiment of the present invention, the resonant circuit includes a resonant capacitor and a heating coil connected in parallel, one end of the resonant capacitor and the heating coil connected in parallel is connected to the power circuit, and the other end of the resonant capacitor and the heating coil connected in parallel is connected to a collector of the IGBT tube.
In order to achieve the above object, another embodiment of the present invention provides an electromagnetic heating apparatus, including the electromagnetic heating circuit.
According to the electromagnetic heating device provided by the embodiment of the invention, the noise of the device can be reduced and the user experience can be improved through the electromagnetic heating circuit.
Drawings
Fig. 1 is a schematic structural view of an electromagnetic heating system in the related art;
FIG. 2 is a block schematic diagram of a power supply circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the operation of a power circuit according to one embodiment of the present invention;
FIG. 4 is a circuit schematic of a power circuit according to one embodiment of the present invention;
FIG. 5 is a circuit schematic of a power circuit according to one embodiment of the present invention, in which current flows in the forward direction;
FIG. 6 is a circuit schematic of a power supply circuit in which current flows in the negative direction, according to one embodiment of the present invention;
fig. 7 is a schematic waveform diagram of a half-wave ac power and a half-wave ac power after injection of a harmonic in a power circuit according to an embodiment of the present invention;
FIG. 8 is a waveform diagram of a half-wave AC power after injection of harmonics in a power supply circuit in accordance with one embodiment of the present invention; and
FIG. 9 is a schematic diagram of a harmonic injection frequency and a harmonically injected sinusoidal waveform of a power supply circuit in accordance with one embodiment of the present invention;
figure 10 is a circuit schematic of an electromagnetic heating circuit according to an embodiment of the present invention.
Reference numerals:
the power supply comprises an alternating current power supply 200, a resonance circuit 300, a power supply circuit 100, a full-bridge rectification module 101, a harmonic module 102, a rectification bridge 1011 and a filtering module 103;
a first inductor L1, a first harmonic injection unit 1021, a second harmonic injection unit 1022, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a third inductor L3, a fourth capacitor C4, a fourth inductor L4, and a transformer T1;
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
First the inventors of the present application discovered and recognized: in the process of heating by the electromagnetic heating system, the coil panel in the resonant circuit generates a periodically-changing magnetic field, the magnetic field acts on the bottom of the pot to enable the bottom of the pot to generate eddy current, the pot and the coil panel attract each other, but the pot generates the eddy current magnetic field, the polarity of the eddy current magnetic field of the pot is the same as that of the magnetic field of the coil panel, and the pot and the coil panel repel each other to generate repulsion force.
Particularly, the pot currently used for the electromagnetic heating system is generally 430 stainless steel, and the 430 stainless steel has certain ferromagnetism, so that the magnetic field generated by the coil panel can magnetize the bottom of the pot, and the magnetized pot bottom can be attracted by the magnetic field of the coil panel, and at the moment when the magnetic field of the coil panel disappears, the magnetic force disappears, but simultaneously, in the process of magnetizing the pot, the vortex current of the pot generates the magnetic field again, and the polarity of the magnetic field of the coil panel is the same, and the pot and the coil panel repel each other. Therefore, the cookware and the coil panel continuously attract and repel each other, and finally the cookware vibrates and generates noise.
The attraction force between the cooker and the coil panel is in positive correlation with the instantaneous current flowing through the coil panel, so that the frequency characteristic of the current/voltage of the coil panel is finally transmitted to the noise characteristic of the cooker. Thus, as shown in fig. 1, after passing through the rectifying circuit of the electromagnetic heating system, the commercial power is converted from the original 50Hz single-frequency ac power into a half-wave ac power containing several hundred Hz ac harmonic components, wherein the ac harmonic components mainly include low-order harmonics of 100Hz to 600 Hz. Like this, after this half-wave alternating current acted on resonant circuit, the electric current that flows through the coil panel also had the low order harmonic of same frequency simultaneously to finally lead to the pan to have the low order harmonic noise of same frequency, above-mentioned harmonic noise mainly distributes at 100Hz, 200Hz, 300Hz, 400Hz, 500Hz and 600Hz frequency point, makes the user feel noisy, and experience effect obviously descends.
Based on this, the embodiment of the invention provides an electromagnetic heating system and a noise reduction device thereof.
An electromagnetic heating system and a noise reduction device thereof according to an embodiment of the present invention will be described with reference to the drawings.
Fig. 2 is a block schematic diagram of a power supply circuit according to an embodiment of the invention. As shown in fig. 2, the power supply circuit 100 is connected between an ac power supply 200 and a resonance circuit 300, and the power supply circuit 100 includes: a full bridge rectification block 101 and a harmonic block 102.
The full-bridge rectification module 101 is configured to rectify a sinusoidal alternating current provided by the alternating current power supply 200; the harmonic module 102 is connected in parallel with the full-bridge rectifier module 101, and the output voltages of the harmonic module 102 and the full-bridge rectifier module 101 are superposed to form sine wave voltage, so that the resonant circuit 300 is powered, the valley bottom of the superposed sine wave voltage is greater than or equal to zero, and the period of the superposed sine wave voltage is half of the sine alternating current provided by the alternating current power supply.
Specifically, the full-bridge rectification module 101 may convert the alternating current provided by the alternating current power supply 200 into a half-wave alternating current (i.e., a pulsating direct current in fig. 3), and the harmonic module 102 may transform the waveform of the half-wave alternating current into a new sine wave current by injecting a harmonic into the half-wave alternating current, wherein a valley of the sine wave is greater than or equal to zero, a period of the sine wave is half of the sine alternating current provided by the alternating current power supply, and a phase of the sine wave is shifted forward by pi/4 with respect to the sine alternating current provided by the alternating.
As shown in fig. 3 to 6, the ac power provided by the ac power source 200 is rectified by the full-bridge rectifier module 101 and then converted into a half-wave ac power, and the half-wave ac power is converted from a non-sinusoidal wave into a sinusoidal wave after the harmonic wave is injected into the harmonic wave module 102, that is, the output voltages of the harmonic wave module 102 and the full-bridge rectifier module 101 are superimposed to form a sinusoidal wave voltage. Therefore, when the superposed sine wave voltage is input into the resonance circuit 300, only 100Hz harmonic waves are contained, and 200Hz, 300Hz, 400Hz and 500Hz … … harmonic waves are removed, so that the noise generated by the vibration of the cookware is reduced.
Specifically, as shown in fig. 9, the waveform of the alternating current supplied from the alternating current power supply 200 may be as shown in a waveform a, and specifically, the alternating current u1 may satisfy the following formula:
i.e. the initial phase of the alternating current
Is 0, U is the effective value voltage of the alternating current, e.g. the effective value voltage of the alternating current mains may be 220V. The waveform of the output voltage u2 obtained by rectifying the ac power by the full-bridge rectifier module 101 is shown as the waveform b, and the output voltage u2 satisfies the following formula:
and is
The waveform of the sine wave voltage u3 obtained by injecting the harmonic wave into the output voltage u2 through the harmonic module 102 may be as shown in the waveform c, and specifically, the superimposed sine wave voltage u3 satisfies the following formula:
wherein ω is0At 2 ω, it can be seen that the phase of the superimposed sine wave voltage u3 is shifted by pi/4 with respect to the sine alternating current supplied from the alternating current power supply.
Therefore, when the sine wave voltage u3 corresponding to the waveform c is input into the resonant circuit 300, only 100Hz harmonic waves are contained, and 200Hz, 300Hz, 400Hz and 500Hz … … harmonic waves are removed, so that the noise generated by the vibration of the cookware is reduced.
The circuit configuration and the operation principle of the power supply circuit according to the embodiment of the present invention are described below.
According to an embodiment of the present invention, as shown in fig. 4-6, the full bridge rectifier module 101 includes: a rectifier bridge 1011 and a first inductor L1.
The first input end of the rectifier bridge 1011 is connected with one end of the alternating current power supply 200, the second input end of the rectifier bridge 1011 is connected with the other end of the alternating current power supply 200, and the first output end of the rectifier bridge 1011 is grounded; one end of the first inductor L1 is connected to the second output terminal of the rectifier bridge 1011, and the other end of the first inductor L1 is connected to the harmonic module 102.
Also, according to an embodiment of the present invention, as shown in fig. 4-6, the harmonic module 102 includes: at least one first harmonic injection unit 1021 and at least one second harmonic injection unit 1022. Wherein, as shown in fig. 5 and 6, the number of the first harmonic injection unit 1021 and the second harmonic injection unit 1022 are both one, and as shown in fig. 4, the number of the first harmonic injection unit 1021 and the second harmonic injection unit 1022 are both two, it should be understood that the larger the number of the first harmonic injection unit 1021 and the second harmonic injection unit 1022, the better the harmonic injection effect.
At least one first harmonic injection unit 1021 is connected in parallel, one end of each first harmonic injection unit is connected with the first input end of the rectifier bridge 1011, and the other end of each first harmonic injection unit is connected with the other end of the first inductor L1; at least one second harmonic injection unit 1022 is connected in parallel with each other, one end of each second harmonic injection unit is connected to the second input terminal of the rectifier bridge 1011, and the other end of each second harmonic injection unit is connected to the other end of the first inductor L1.
Specifically, each first harmonic injection unit 1021 includes: a third capacitor C3 and a third inductor L3. One end of the third capacitor C3 is connected to the first input end of the rectifier bridge 1011; one end of the third inductor L3 is connected to the other end of the third capacitor C3, and the other end of the third inductor L3 is connected to the other end of the first inductor L1.
And, each second harmonic injection unit 1022 includes: a fourth capacitor C4 and a fourth inductor L4. One end of the fourth capacitor C4 is connected to the second input end of the rectifier bridge 1011; one end of the fourth inductor L4 is connected to the other end of the fourth capacitor C4, and the other end of the fourth inductor L4 is connected to the other end of the first inductor L1. Further, as shown in fig. 4 to 6, the power supply circuit further includes: and the filtering module 103, wherein the filtering module 103 is connected between the harmonic module 102 and the resonant circuit 300.
Specifically, the filtering module 103 includes: a second inductor L2 and a first capacitor C1. One end of the second inductor L2 is connected to the other end of the first inductor L1, and the other end of the second inductor L2 is connected to the resonant circuit 300; one end of the first capacitor C1 is connected to one end of the second inductor L2, and the other end of the first capacitor C1 is grounded.
Further, as shown in fig. 10, the filtering module 103 may further include: a second capacitor C2. One end of the second capacitor C2 is connected to the other end of the second inductor L2, and the other end of the second capacitor C2 is grounded.
Specifically, the rectifier bridge 1011 is used to convert the ac power supplied from the ac power supply 200 into half-wave ac power; the third capacitor C3 and the fourth capacitor C4 are nonpolar coupling capacitors and are used for coupling the voltage of the alternating current to a post-stage circuit; the first capacitor C1 and the second capacitor C2 are used for storing energy and filtering; the first inductor L1, the second inductor L2, the third inductor L3 and the fourth inductor L4 are used for preventing current from suddenly changing and have an energy storage function.
As described above, in conjunction with the embodiments of fig. 5-8, the power circuit utilizes the coupling effect of the capacitor and the absorption-transfer effect and the energy storage effect of the inductor to realize the harmonic injection. When the alternating current flows in the forward direction, that is, the current flows out from one end of the alternating current power supply 200 and finally flows back to the other end of the alternating current power supply 200, the flowing direction of the current is as shown in fig. 5, the alternating current is rectified into half-wave alternating current through the rectifier bridge 1011, and the alternating current is coupled through the third capacitor C3 and then injected into the half-wave alternating current so that the waveform of the half-wave alternating current becomes smoother, at this time, no current flows through the fourth capacitor C4, but oscillation approximately conforming to the sine wave rule is formed inside the fourth capacitor C4 and the fourth inductor L4; when the alternating current flows in the negative direction, that is, the current flows out from the other end of the alternating current power supply 200 and finally flows back to one end of the alternating current power supply 200, the flowing direction of the current is as shown in fig. 6, the alternating current is rectified into half-wave alternating current through the rectifier bridge 1011, and the alternating current is coupled through the fourth capacitor C4 and then injected into the half-wave alternating current rectified by the rectifier bridge 101 so that the waveform of the half-wave alternating current becomes smoother, at this time, no current flows through the third capacitor C3, but oscillation approximately conforming to the sine wave rule is formed inside the third capacitor C3 and the third inductor L3 due to the characteristics of the third.
Specifically, 4 input terminals of the oscilloscope may be connected to the point a, the point B, the point C, and the point D, respectively, to correspond to the voltage waveform of the half-wave alternating current after the rectification is observed, the voltage waveform of the node between the third capacitor C3 and the third inductor L3, the voltage waveform of the node between the fourth capacitor C4 and the fourth inductor L4, and the voltage waveform of the point a, the point B, and the point C where the direct current is superimposed by the second inductor L2, and specifically, the voltage waveform of the point a, the voltage waveform of the point B, the voltage waveform of the point C, and the voltage waveform of the point D may be as shown in fig. 7.
Thus, after the rectified half-wave alternating current passes through the first harmonic injection unit 1021 and the second harmonic injection unit 1022, the waveform becomes smoother as a whole, and due to the characteristics of the third capacitor C3, the third inductor L3, the fourth capacitor C4 and the fourth inductor L4, a certain oscillation is formed inside the third capacitor C3 and the third inductor L3, and inside the fourth capacitor C4 and the fourth inductor L4, and the oscillation waveform just approximately conforms to a sine wave law (such as a voltage waveform at a point B and a voltage waveform at a point C in fig. 7), and a better sine wave with a direct current component can be basically formed by superimposing the half-wave alternating current on the second inductor L2.
It should be noted that, in a specific example of the present invention, the capacitance value of the third capacitor of the at least one first harmonic injection unit 1021 is equal to the capacitance value of the fourth capacitor of the at least one second harmonic injection unit 1022, the inductance value of the third inductor of the at least one first harmonic injection unit 1021 is equal to the inductance value of the fourth inductor of the at least one second harmonic injection unit 1022, that is, as shown in fig. 5 and fig. 6, the capacitance value of the fourth capacitor C4 is equal to the capacitance value of the third capacitor C3, and the inductance value of the fourth inductor L4 is equal to the inductance value of the third inductor L3. Therefore, the rectified half-wave alternating current can be ensured to be changed into a complete sine waveform after harmonic injection.
Furthermore, the inductance value of the first inductor L1 is greater than the capacitance value of the at least one first harmonic injection unit 1021 or the inductance value of the at least one second harmonic injection unit 1022, that is, as shown in fig. 5 and 6, the inductance value of the first inductor L1 is greater than the inductance value of the fourth inductor L4 or the third inductor L3. This is because the current passing through the first inductor L1 is relatively large, and the current passing through the fourth inductor L4 or the third inductor L3 is relatively small, so to ensure that the three are synchronous, the inductance of the fourth inductor L4 and the inductance of the third inductor L3 are equal, and the inductance of the first inductor L1 is greater than the inductance of the fourth inductor L4 or the third inductor L3.
In addition, according to an embodiment of the present invention, the harmonic module 102 injects harmonics into the full-bridge rectifier module 101, so that the output voltages of the harmonic module 102 and the full-bridge rectifier module 101 are superimposed to form a sine wave voltage, wherein the frequency of the harmonic output voltage is equal to 8M times the frequency of the sine alternating current provided by the alternating current power supply 200, and M is 1 or M is an even number greater than 1, that is, M may be equal to 1, 2, 4, 6, … ….
Specifically, as shown in fig. 9, the slope of the superimposed sine-wave voltage changes at 1/4 every half cycle of the alternating current, and the time between any two adjacent turning points of the slope on the superimposed sine-wave voltage can be defined as the harmonic injection frequency f, and the harmonic injection frequency f can be equal to 8 times the frequency of the alternating current. Thus, the selection of the third inductor L3, the fourth inductor L4, the first inductor L1, the fourth capacitor C4 and the third capacitor C4 is in principle related to the frequency of the alternating current, e.g. 50Hz, so that the harmonic injection frequency is equal to 8M times the frequency of the alternating current, e.g. 400 Hz.
Moreover, the energy stored in the first capacitor C1 and the second inductor L2 should at least satisfy the energy release requirement of the resonant circuit 300 in a resonant period, that is, the selection of the first capacitor C1 and the second inductor L2 is related to the resonant parameter of the resonant circuit 300, and the energy stored in the first capacitor C1 and the second inductor L2 should be enough to release the energy stored in the resonant circuit 300 in a resonant period.
According to a specific example of the present invention, at different powers, the parameters of the third inductor L3, the second inductor L2, the fourth inductor L4, the first inductor L1, the first capacitor C1, the third capacitor C3 and the fourth capacitor C4 may be set as in table 1 below, and it should be noted that these parameters cannot be changed at will and are not necessarily in a multiple relationship.
TABLE 1
Further, as shown in fig. 4 to 6, the full-bridge rectifier module 101 is connected to the ac power supply 200 through a transformer T1, wherein one end of a primary of a transformer T1 is connected to one end of the ac power supply 200, the other end of a primary of a transformer T1 is connected to the other end of the ac power supply 200, one end of a secondary of a transformer T1 is connected to a first input terminal of the rectifier bridge 1011, and the other end of a secondary of a transformer T1 is connected to a second input terminal of the rectifier bridge 1011.
Specifically, the transformer T1 is used to isolate the ac power source 200 from the subsequent stage circuit to form an independent subsequent stage circuit.
In summary, according to the power circuit provided by the embodiment of the invention, the harmonic module connected in parallel with the full-bridge rectification module is added, the valley bottom of the output voltage after the harmonic module and the full-bridge rectification module are overlapped is greater than or equal to zero, and the period is half of the sinusoidal alternating current provided by the alternating current power supply, that is, the overlapped output voltage has only one fundamental frequency, so that the noise generated by the vibration of the cookware is reduced, and the user experience is improved.
An embodiment of the present invention further provides an electromagnetic heating circuit, as shown in fig. 10, the electromagnetic heating circuit includes: resonant circuit 300, IGBT tube 400, power supply circuit 100 described above, drive circuit 500, and control circuit 600.
Wherein, the collector of the IGBT tube 400 is connected with the resonance circuit 300, and the emitter of the IGBT tube 400 is grounded; the power supply circuit 100 is connected between the resonance circuit 300 and the ac power supply 200; the driving circuit 500 is connected to the gate of the IGBT tube 400 to drive the IGBT tube 400 to turn on or off; the control circuit 600 is connected to the driving circuit 500, and the control circuit 600 is used for controlling the driving circuit 500 to drive the IGBT tube 400 through the driving circuit 500.
Specifically, the resonance circuit 300 may include a resonance capacitor Cm and a heating coil Lm connected in parallel, one end of which is connected to the power circuit 100, and the other end of which is connected to the collector of the IGBT tube 400.
It should be understood that the circuit structure and the operation principle of the electromagnetic heating circuit and its respective components are well known to those skilled in the art, and are not described herein for brevity.
In summary, according to the electromagnetic heating circuit provided in the embodiment of the invention, through the power circuit, the frequency characteristic of the noise transmitted to the pot by the resonant circuit can be changed, the noise generated by the vibration of the pot is reduced, and the user experience is improved.
Finally, the embodiment of the invention further provides an electromagnetic heating device, which comprises the electromagnetic heating circuit.
Wherein, the electromagnetic heating equipment can be an electromagnetic oven, an electromagnetic rice cooker or an electromagnetic pressure cooker, etc.
According to the electromagnetic heating equipment provided by the embodiment of the invention, the noise of the equipment can be reduced and the user experience can be improved by arranging the electromagnetic heating circuit.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A power supply circuit connected between an alternating current power supply and a resonance circuit, comprising:
the full-bridge rectification module is used for rectifying the sine alternating current provided by the alternating current power supply;
the harmonic module is connected with the full-bridge rectification module in parallel, the output voltages of the harmonic module and the full-bridge rectification module are superposed to form sine wave voltage so as to supply power to the resonant circuit, the valley bottom of the superposed sine wave voltage is greater than or equal to zero, and the period of the superposed sine wave voltage is half of the sine alternating current provided by the alternating current power supply;
the harmonic module injects harmonic into the output half-wave alternating current of the full-bridge rectification module to transform the waveform of the half-wave alternating current into a sinusoidal waveform.
2. The power supply circuit of claim 1, wherein the full-bridge rectification module comprises:
a first input end of the rectifier bridge is connected with one end of the alternating current power supply, a second input end of the rectifier bridge is connected with the other end of the alternating current power supply, and a first output end of the rectifier bridge is grounded;
and one end of the first inductor is connected with the second output end of the rectifier bridge, and the other end of the first inductor is connected with the resonant circuit.
3. The power supply circuit of claim 2, wherein the harmonic module comprises:
the first harmonic injection units are connected in parallel, one end of each first harmonic injection unit is connected with the first input end of the rectifier bridge, and the other end of each first harmonic injection unit is connected with the other end of the first inductor;
the second harmonic injection units are connected in parallel, one end of each second harmonic injection unit is connected with the second input end of the rectifier bridge, and the other end of each second harmonic injection unit is connected with the other end of the first inductor.
4. The power supply circuit of claim 3, wherein each first harmonic injection unit comprises:
a third capacitor, one end of the third capacitor is connected with the first input end of the rectifier bridge,
one end of the third inductor is connected with the other end of the third capacitor, and the other end of the third inductor is connected with the other end of the first inductor;
each of the second harmonic injection units includes:
one end of the fourth capacitor is connected with the second input end of the rectifier bridge,
and one end of the fourth inductor is connected with the other end of the fourth capacitor, and the other end of the fourth inductor is connected with the other end of the first inductor.
5. The power supply circuit according to claim 4, wherein the capacitance value of the third capacitor of the at least one first harmonic injection unit and the capacitance value of the fourth capacitor of the second harmonic injection unit are equal, and the inductance value of the third inductor of the at least one first harmonic injection unit and the inductance value of the fourth inductor of the second harmonic injection unit are equal.
6. The power supply circuit according to claim 4, wherein an inductance value of the first inductor is larger than an inductance value of a third inductor of the at least one first harmonic injection unit and an inductance value of a fourth inductor of the at least one second harmonic injection unit.
7. The power supply circuit of claim 1, wherein the frequency of the harmonic module output voltage is equal to 8M times the frequency of the sinusoidal alternating current provided by the alternating current power supply, M being 1 or M being an even number greater than 1.
8. The power supply circuit according to claim 1, further comprising:
a filtering module connected between the harmonic module and the resonant circuit.
9. The power supply circuit of claim 8, wherein the filtering module comprises:
one end of the second inductor is connected with the harmonic module, and the other end of the second inductor is connected with the resonant circuit;
and one end of the first capacitor is connected with one end of the second inductor, and the other end of the first capacitor is grounded.
10. The power supply circuit of claim 9, wherein the energy stored by the first capacitor and the second inductor at least meets the energy release requirement of the resonant circuit in one resonant period.
11. An electromagnetic heating circuit, comprising:
a resonant circuit;
the collector of the IGBT tube is connected with the resonance circuit, and the emitter of the IGBT tube is grounded;
the power supply circuit according to any one of claims 1 to 10, connected between the resonance circuit and the alternating-current power supply;
the driving circuit is connected with the grid electrode of the IGBT tube to drive the IGBT tube to be switched on or switched off;
and the control circuit is connected with the driving circuit and is used for controlling the driving circuit.
12. The electromagnetic heating circuit according to claim 11, wherein the resonant circuit comprises a resonant capacitor and a heating coil connected in parallel, one end of the resonant capacitor and the heating coil connected in parallel is connected to the power supply circuit, and the other end of the resonant capacitor and the heating coil connected in parallel is connected to a collector of the IGBT tube.
13. Electromagnetic heating device, characterized in that it comprises an 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 |
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| 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 |
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| Publication Number | Publication Date |
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| CN107371287A CN107371287A (en) | 2017-11-21 |
| CN107371287B true CN107371287B (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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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| 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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