CN118250850A - Detection circuit, method, induction heating apparatus, and storage medium - Google Patents
Detection circuit, method, induction heating apparatus, and storage medium Download PDFInfo
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- CN118250850A CN118250850A CN202211658701.5A CN202211658701A CN118250850A CN 118250850 A CN118250850 A CN 118250850A CN 202211658701 A CN202211658701 A CN 202211658701A CN 118250850 A CN118250850 A CN 118250850A
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- 238000001514 detection method Methods 0.000 title claims abstract description 242
- 238000010438 heat treatment Methods 0.000 title claims abstract description 56
- 230000006698 induction Effects 0.000 title claims abstract description 47
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- 230000001939 inductive effect Effects 0.000 claims description 29
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- 239000003990 capacitor Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides a detection circuit, a method, an induction heating device and a storage medium, wherein the detection circuit comprises: the driving module is used for providing driving electric energy; the resonance module is connected with the driving module and is used for carrying out resonance work according to the driving electric energy; the detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module. According to the application, the direction of the working current is determined through the detection signal, so that the resonant module is accurately determined to work in the capacitive area according to the direction of the working current, and protection measures are executed when the resonant module works in the capacitive area, thereby reducing the loss of the driving module and ensuring the heating safety.
Description
Technical Field
The present application relates to the field of induction heating technology, and more particularly, to a detection circuit, a detection method, an induction heating apparatus, and a storage medium.
Background
When the induction heating equipment works, if the working frequency is larger than the resonant frequency, the induction heating equipment works in the inductive area, and if the working frequency is smaller than the resonant frequency, the induction heating equipment works in the capacitive area.
When the induction heating equipment works in the capacitive area, the loss of the driving module can be improved, the driving module is extremely easy to damage, and the heating safety is affected. In addition, the factors influencing the resonant frequency are more, whether the induction heating equipment works in the capacitive area is difficult to accurately judge in practical application, and great potential safety hazards exist.
Disclosure of Invention
In view of the above, the present application proposes a detection circuit, a method, an induction heating apparatus, and a storage medium to improve the above.
In a first aspect, an embodiment of the present application provides a detection circuit, including: the driving module is used for providing driving electric energy; the resonance module is connected with the driving module; the resonance module is used for carrying out resonance work according to the driving electric energy and comprises a resonance coil and a resonance mutual inductance unit; the resonance mutual inductance unit is a primary side of the current transformer; the detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the detection mutual inductance unit is a secondary side of the current transformer; the control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module.
In a second aspect, an embodiment of the present application further provides a detection method, applied to the detection circuit as in the first aspect, where the method includes: acquiring a detection signal; determining the direction of the working current of the resonance module according to the detection signal; and when the resonance module is determined to work in the capacitive area according to the working state of the driving module and the direction of the working current, executing the protection measures.
In a third aspect, an embodiment of the present application further provides an induction heating apparatus, where the induction heating apparatus includes an apparatus body and a detection circuit as in the first aspect provided on the apparatus body.
In a fourth aspect, embodiments of the present application also provide another induction heating apparatus, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the detection method as in the second aspect.
In a fifth aspect, embodiments of the present application also provide a computer-readable storage medium storing computer-executable instructions for enabling an induction heating apparatus to perform a detection method as in the second aspect.
The application provides a detection circuit, a method, an induction heating device and a storage medium, wherein the detection circuit comprises: the driving module is used for providing driving electric energy; the resonance module is connected with the driving module and is used for carrying out resonance work according to the driving electric energy; the detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module. According to the application, the direction of the working current is determined through the detection signal, so that the resonant module is accurately determined to work in the capacitive area according to the direction of the working current, and the protection measures are executed when the resonant module works in the capacitive area, so that the driving module can be prevented from working when the induction heating equipment works in the capacitive area, the loss of the driving module is reduced, and the heating safety is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, not all embodiments. All other embodiments and figures obtained by a person skilled in the art without any inventive effort are within the scope of protection of the present application based on the embodiments of the present application.
Fig. 1 is a schematic structural diagram of a detection circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a detection module according to an embodiment of the present application.
Fig. 3 is a schematic diagram of detecting a voltage at a first end of a mutual inductance unit according to an embodiment of the present application.
Fig. 4 is another schematic structural diagram of a detection module according to an embodiment of the present application.
Fig. 5 is another schematic diagram of detecting a voltage at a first end of a mutual inductance unit according to an embodiment of the present application.
Fig. 6 is another schematic diagram of a detection circuit according to an embodiment of the present application.
Fig. 7 is a schematic flow chart of a detection method according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a detection device according to an embodiment of the present application.
Fig. 9 is a schematic structural view of an induction heating apparatus according to an embodiment of the present application.
Fig. 10 is a schematic structural view of another induction heating apparatus according to an embodiment of the present application.
Fig. 11 is a block diagram of a computer-readable storage medium according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
When the induction heating equipment works, if the working frequency is larger than the resonant frequency, the induction heating equipment works in the inductive area, and if the working frequency is smaller than the resonant frequency, the induction heating equipment works in the capacitive area.
When the induction heating equipment works in the capacitive area, the loss of the driving module can be improved, the driving module is extremely easy to damage, and the heating safety is affected.
The resonant frequency is determined by the input voltage, the resonant coil parameters and the cooking appliance placed during induction heating, and because the materials of the cooking appliance used by the user are various, the resonant frequency is difficult to determine, and in order to avoid the induction heating device operating in the capacitive area, the inductance parameters of the resonant coil are increased in the related art so as to reduce the resonant frequency, but this reduces the heating efficiency of the induction heating device and increases the cost of the resonant coil.
In order to improve the above-described problems, the inventors propose a detection circuit, a method, an induction heating apparatus, and a storage medium, provided by the present application, the detection circuit including: the driving module is used for providing driving electric energy; the resonance module is connected with the driving module and is used for carrying out resonance work according to the driving electric energy; the detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module. According to the application, the direction of the working current is determined through the detection signal, so that the resonant module is accurately determined to work in the capacitive area according to the direction of the working current, and protection measures are executed when the resonant module works in the capacitive area, thereby reducing the loss of the driving module and ensuring the heating safety.
The detection circuit provided by the embodiment of the application will be described in detail through specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a detection circuit according to an embodiment of the application. As shown in fig. 1, the detection circuit 100 in fig. 1 includes a driving module 110, a resonance module 120, a detection module 130, and a control module 140.
In some embodiments, the driving module 110 is configured to provide driving power for the resonant module 120 to operate.
In some embodiments, the driving module 110 includes a switching module including at least two switching transistors, and the magnitude of the driving power provided by the driving module 110 may be adjusted by adjusting the switching frequency of the switching transistors.
Optionally, the switching tube may be a triode, a MOS (MOSFET, field effect transistor), a thyristor, an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), or the like, which may be specifically selected according to the actual use requirement, which is not limited in the present application.
In some embodiments, the driving module 110 further includes a diode rectifier bridge for rectifying the ac power provided by the ac power source into dc power, and the switching module converts the dc power into the driving power required for the operation of the resonant module 120.
In some embodiments, the resonance module 120 is connected to the driving module 110; the resonance module 120 is used for performing resonance operation according to driving power; the resonance module 120 includes a resonance coil 121 and a resonance mutual inductance unit 122; wherein the resonant transformer 122 is the primary side of the current transformer.
Alternatively, the resonant transformer 122 is connected in series with the resonant coil 121.
In some embodiments, the detection module 130 includes a detection mutual inductance unit 131, and the detection module 130 is configured to determine a detection signal according to a voltage of the detection mutual inductance unit 131; wherein the detection mutual inductance unit 131 is a secondary side of the current transformer.
Specifically, the current transformer consists of a closed iron core and a winding, and is an instrument for converting primary side large current into secondary side small current according to an electromagnetic induction principle for measurement.
It will be appreciated that the resonant transformer unit 122 and the detection transformer unit 131 constitute a current transformer, by which the direction of the operating current in the resonant module 120 is changed when the direction of the operating current in the detection module 130 is changed, so that the direction of the operating current in the resonant module 120 can be determined by the detection module 130, as will be described in detail in the following embodiments.
In some embodiments, the control module 140 is connected to the detection module 130 and the driving module 110, and the control module 140 is configured to determine a direction of an operating current of the resonance module 120 according to the detection signal, and to perform a protection measure when it is determined that the resonance module 120 is operating in the capacitive region according to the direction of the operating current and an operating state of the driving module 110.
Specifically, when the resonance module 120 is operated in the capacitive region, the voltage change lags behind the current change, and when the resonance module 120 is operated in the inductive region, the current change lags behind the voltage change, so that when the resonance module 120 is operated in the capacitive region and the inductive region respectively, the direction of the operating current of the resonance module 120 when the operating state of the driving module 110 is changed is opposite, and thus the operating state of the driving module 110 can be obtained, and the direction of the inductive current when the resonance module 120 is operated in the inductive region in the operating state can be determined.
Specifically, if the direction of the operating current is the same as the direction of the inductive current, it is determined that the resonant module 120 is operating in the inductive region, and if the direction of the operating current is different from the direction of the inductive current, it is determined that the resonant module 120 is operating in the capacitive region, which will be described in the following embodiments.
In some embodiments, the control module 140 may employ an MCU (Microcontroller Unit; micro control unit), an MPU (Microprocessor Unit; microprocessor), a CPU (Central Processing Unit; central processing unit), etc., which may be specifically selected according to actual use needs, which is not limited by the present application.
In this way, the present application can determine whether the resonant module 120 works in the capacitive area through the direction of the working current, and perform the protection measures when the resonant module 120 works in the capacitive area, so as to avoid the driving module 110 from working when the induction heating device works in the capacitive area, reduce the loss of the driving module 110 and ensure the heating safety.
Compared with the related art, the technical scheme provided by the application does not need to increase the inductance parameter of the resonant coil, saves the production cost and improves the heating efficiency in the induction heating process.
Referring to fig. 2 again, fig. 2 is a schematic structural diagram of a detection module according to an embodiment of the application. As shown in fig. 2, the detection module 130 includes a detection mutual inductance unit 131 and a comparison unit 132.
In some embodiments, the first input end 1321 of the comparing unit 132 is connected to the first end 1311 of the detecting transformer unit 131, the second input end 1322 of the comparing unit 132 is connected to the first constant voltage node, the output end 1323 of the comparing unit 132 is connected to the control module, and the comparing unit 132 is configured to determine the detecting signal according to the voltage of the first end 1311 of the detecting transformer unit 131 and the voltage of the first constant voltage node.
In the above manner, the comparing unit 132 may determine the detection signal by detecting the voltage of the first end 1311 of the mutual inductance unit 131, and the detection signal may reflect the direction of the operating current of the resonance module 120 to detect the direction of the operating current of the resonance module 120 in real time.
In some embodiments, the second terminal 1312 of the detection transformer 131 is connected to a second constant voltage node, wherein the voltage of the second constant voltage node is equal to the voltage of the first constant voltage node.
The input end of the comparing unit 132 cannot identify the negative voltage signal, the voltage of the detecting transformer 131 is a sine wave, and the voltage of the negative half cycle is less than zero and cannot be identified by the comparing unit 132; the second constant voltage node is thus provided to raise the zero point of the detection transformer unit 131 so that the voltage of the first end 1311 of the detection transformer unit 131 is always greater than zero.
Referring to fig. 3 again, fig. 3 is a schematic diagram of a voltage waveform of a first end of a detection transformer according to an embodiment of the application. As shown in fig. 3, the horizontal axis represents time t, the vertical axis represents voltage U at the first end of the detection transformer unit, and the zero point coordinate represents (0, voltage at the second constant voltage node).
When the voltage of the detecting transformer 131 is at the positive half cycle and the negative half cycle of the sine wave, the working current of the resonant module 120 is in the first direction and the second direction; the comparing unit 132 is configured to compare the voltage at the first end 1311 of the detecting transformer 131 with the voltage at the first constant voltage node, so that the detecting signals output by the comparing unit 132 are different level signals when the voltage of the detecting transformer 131 is respectively in the positive half cycle and the negative half cycle of the sine wave, so as to accurately detect the working current of the resonant module 120, and the voltage at the second constant voltage node needs to be equal to the voltage at the first constant voltage node.
If the voltage of the first constant voltage node is equal to the voltage of the second constant voltage node, in fig. 3, when the voltage of the first end 1311 of the detecting transformer 131 is greater than the voltage of the second constant voltage node, the detecting signal output by the comparing unit 132 is a first level signal, which is used to indicate that the working current of the resonant module 120 is located in the first direction; when the voltage of the first end 1311 of the detecting transformer 131 is smaller than the voltage of the second constant voltage node, the detecting signal output by the comparing unit 132 is a second level signal, which is used to indicate that the working current of the resonant module 120 is located in the second direction.
In some embodiments, the voltage of the second constant voltage node may be not equal to the voltage of the first constant voltage node, but close to the voltage of the first constant voltage node, so as to start to perform protection measures when the resonant module 120 operates in the inductive area but is close to the capacitive area, so as to more strictly protect the heating process of the induction heating device.
Referring to fig. 4 again, fig. 4 is a schematic structural diagram of another detection module according to an embodiment of the application. As shown in fig. 4, the detection module 130 includes a detection mutual inductance unit 131, a first comparison unit 133, and a second comparison unit 134.
In some embodiments, to improve detection accuracy, the detection module 130 includes a first comparison unit 133 and a second comparison unit 134.
The first input end 1331 of the first comparing unit 133 is connected to the first end 1311 of the detecting transformer unit 131, the second input end 1332 of the first comparing unit 133 is connected to the third constant voltage node, the output end 1333 of the first comparing unit is connected to the control module 140, and the first comparing unit 133 is configured to determine a first detecting signal according to the voltage of the first end 1311 of the detecting transformer unit 131 and the voltage of the third constant voltage node.
The first input end 1341 of the second comparing unit 134 is connected to the first end 1311 of the detecting mutual inductance unit 131, the second input end 1342 of the second comparing unit 134 is connected to the fourth constant voltage node, the output end 1343 of the second comparing unit 134 is connected to the control module, and the second comparing unit 134 is configured to determine the second detecting signal according to the voltage of the first end of the detecting mutual inductance unit 131 and the voltage of the fourth constant voltage node;
the control module 140 is configured to determine a direction of an operating current of the resonance module according to the first detection signal and the second detection signal.
In some embodiments, in order for the first comparing unit 133 and the second comparing unit 134 to be used for detecting the operating currents of the resonant modules 120 in different directions, respectively, the first input terminal of the first comparing unit 133 is a forward input terminal, and the first input terminal of the second comparing unit 134 is a reverse input terminal.
In the above manner, when the detection signals output by the first comparing unit 133 and the second comparing unit 134 are opposite level signals, that is, when the first detection signal output by the first comparing unit 133 is a high level signal, the second detection signal output by the second comparing unit 134 is a low level signal; when the first detection signal output by the first comparing unit 133 is a low level signal, the second detection signal output by the second comparing unit 134 is a high level signal, so that the control module 140 determines the direction of the working current according to the first detection signal and the second detection signal, respectively, and the detection accuracy of the direction of the working current is improved.
In some embodiments, the second end of the detecting transformer 131 is connected to a fifth constant voltage node, and in order to avoid misjudging the direction of the working current by the first comparing unit 133 and the second comparing unit 134, the voltage of the fifth constant voltage node is less than or equal to the voltage of the third constant voltage node, and the voltage of the fifth constant voltage node is greater than or equal to the voltage of the fourth constant voltage node.
Referring to fig. 5 again, fig. 5 is another schematic diagram of detecting a voltage at a first end of a mutual inductance unit according to an embodiment of the present application. As shown in fig. 5, the horizontal axis represents time t, the vertical axis represents voltage U at the first end of the detection transformer unit, and the zero point coordinate represents (0, voltage at the fifth constant voltage node).
In fig. 5, when the voltage of the first end 1311 of the detecting transformer 131 is greater than the voltage of the third constant voltage node, the detecting signal output by the first comparing unit 133 is a first level signal, for indicating that the working current of the resonant module 120 is located in the first direction; when the voltage of the first end 1311 of the detecting transformer 131 is smaller than the voltage of the fourth constant voltage node, the detecting signal output by the second comparing unit 134 is a first level signal, which is used to indicate that the working current of the resonant module 120 is located in the second direction.
In fig. 5, the third constant voltage node is greater than the voltage of the fifth constant voltage node, and the voltage of the fourth constant voltage node is less than the voltage of the fifth constant voltage node, so as to avoid misjudgment of the working capacitive area of the induction heating device by the control module due to fine fluctuation of the voltage, and improve the recognition accuracy of the direction of the working current.
Further, the voltage values of the third constant voltage node and the fourth constant voltage node may be unequal to set different detection voltage points for the first detection unit 133 and the second detection unit 134, so that the detection process may be automatically adjusted according to actual needs, and the recognition accuracy is improved.
Referring to fig. 6, fig. 6 is another schematic diagram of a detection circuit according to an embodiment of the present application. As shown in fig. 6, the detection circuit 100 includes a driving module 110, a resonance module 120, a detection module 130, and a control module 140.
In the embodiment shown in fig. 6, the driving module 110 includes a diode rectifier bridge, a first resistor R1, a second resistor R2, a first switching tube IGBT1, and a second switching tube IGBT2.
The diode rectifier bridge takes an AC input (ALTERNATING CURRENT ) through ports L1 and N1 and rectifies the alternating current into direct current.
The first switching tube IGBT1 is connected with the control module 140 through a first resistor R1 and is used for receiving a first driving signal PWM-H sent by the control module 140, and the first driving signal PWM-H is used for controlling the first switching tube IGBT1 to be turned on or turned off; the second switching tube IGBT2 is connected to the control module 140 through a second resistor R2, and is configured to receive a second driving signal PWM-L sent by the control module 140, where the second driving signal PWM-L is used to control the second switching tube IGBT2 to be turned on or off.
In the embodiment shown in fig. 6, the resonance module 120 includes a resonance coil X1, a resonance mutual inductance unit, a first resonance unit, and a second resonance unit; the first resonance unit comprises a capacitor C1, the second resonance unit comprises a capacitor C2, the resonance mutual inductance unit comprises a primary side of the current transformer TL1, and the primary side of the current transformer TL1 is a 1-end to 2-end part of the current transformer TL 1.
Further, the resonant coil X1, the resonant transformer, the capacitor C1 and the driving module 110 form a first resonant circuit, and when the first switching tube IGBT1 is turned on and the second switching tube IGBT2 is turned off, the resonant module 120 works under the first resonant circuit; the resonant coil X1, the resonant transformer, the capacitor C2 and the driving module 110 form a second resonant circuit, and when the first switching tube IGBT1 is turned off and the second switching tube IGBT2 is turned on, the resonant module 120 operates in the second resonant circuit.
In the embodiment shown in fig. 6, the direction of the operating current of the resonance module 120 when the resonance module 120 operates under the first resonance loop is defined as a positive direction, and the current flows from the resonance coil X1 to the resonance transformer unit to the capacitor C1.
In the embodiment shown in fig. 6, the direction of the operating current of the resonant module 120 when the resonant module 120 operates in the second resonant tank is defined as a negative direction, and the current flows from the capacitor C2 to the resonant transformer unit to the resonant coil X1.
In the embodiment shown in fig. 6, the detection module 130 includes a first comparison unit, a second comparison unit, a detection mutual inductance unit, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a power source VCC; the first comparison unit comprises a comparator U1A, the second comparison unit comprises a comparator U1B, the detection mutual inductance unit comprises a secondary side of the current transformer, and the secondary side of the current transformer is a 3-end to 4-end part of the current transformer TL 1.
Specifically, the first end, i.e. the 3 end, of the detecting transformer unit is connected to the forward input end of the U1A and the reverse input end of the U1B, the second end, i.e. the 4 end, of the detecting transformer unit is connected to the fifth constant voltage node B, and the voltage at the point B is the voltage of the eighth resistor R8, so that the voltage of the detecting transformer unit is a sine wave, and the zero point of the sine wave is the voltage at the point B.
It is understood that the resistance values of the fifth resistor R5 and the eighth resistor R8 may be set in advance so that the voltage of the eighth resistor R8, that is, the voltage of the point B, is constant, or a variable resistance device such as a sliding resistor may be used instead of the fifth resistor R5 or the eighth resistor R8 to adjust the voltage of the point B at any time.
Further, the resonant transformer in the resonant module 120 is the same as the current direction of the detection transformer in the detection module 130.
Therefore, when the direction of the working current of the resonance module 120 is the positive direction, the direction of the current in the detection mutual inductance unit is from 3 end to 4 end, and the voltage of the 3 end of the detection mutual inductance unit is larger than the voltage of the point B; when the direction of the working current of the resonance module 120 is a negative direction, the direction of the current in the detection mutual inductance unit is from 4 end to 3 end, and the voltage of the 3 end of the detection mutual inductance unit is smaller than the voltage of the point B.
Specifically, the positive input end of the comparator U1A is connected to the first end, i.e. the 3 end, of the detection transformer unit, and the negative input end of the comparator U1A is connected to the third constant voltage node C.
When the 3-terminal voltage is greater than the C-point voltage, if the B-point voltage is less than or equal to the C-point voltage, the first detection signal output by the U1A is a high-level signal, and at this time, the current flowing from the 3-terminal to the 4-terminal of the detection transformer unit is reflected, that is, the direction of the working current of the resonant module 120 is a positive direction.
It is understood that the resistance values of the third resistor R3 and the fifth resistor R5 may be set in advance so that the voltage of the fifth resistor R5, that is, the voltage of the point C is constant, or a variable resistance device such as a sliding rheostat may be used instead of the third resistor R3 or the fifth resistor R5 to adjust the voltage of the point B at any time.
Specifically, the reverse input end of the comparator U1B is connected to the first end, i.e. the 3 end, of the detection transformer unit, and the forward input end of the comparator U1B is connected to the fourth constant voltage node D.
When the 3-terminal voltage is smaller than the D-point voltage, if the B-point voltage is greater than or equal to the D-point voltage, when the second detection signal output by the U1A is a high-level signal, the current flowing from the 4-terminal to the 3-terminal of the detection transformer unit is reflected, that is, the direction of the working current of the resonant module 120 is a negative direction.
It is understood that the resistance values of the fourth resistor R4 and the seventh resistor R7 may be set in advance so that the voltage of the seventh resistor R7, that is, the voltage of the point C, is constant, or a variable resistance device such as a sliding resistor may be used instead of the fourth resistor R4 or the seventh resistor R7 to adjust the voltage of the point D at any time.
In this way, when the first detection signal output by the comparator U1A is a high level signal, the direction of the operating current of the resonant module 120 is determined to be a positive direction, and when the second detection signal output by the comparator U1B is a high level signal, the direction of the operating current of the resonant module 120 is determined to be a negative direction, so that the direction of the operating current of the resonant module 120 is determined by detecting the voltage of the mutual inductance unit, and since there are two comparison units, the voltages of the constant voltage nodes connected by each comparison unit may be unequal, thereby improving the flexibility of the detection process.
Referring to fig. 7 again, fig. 7 is a flow chart of a detection method according to an embodiment of the application. As shown in fig. 7, the detection method 200 is applied to the detection circuit shown in fig. 1, and the method includes: step 210 to step 230.
Step 210: a detection signal is acquired.
In some embodiments, the detection module includes a comparison unit, and the detection signal includes a detection signal output by the comparison unit.
In some embodiments, the detection module includes a first comparison unit and a second comparison unit, and the detection signal includes a first detection signal output by the first detection module and a second detection signal output by the second detection module.
Step 220: and determining the direction of the working current of the resonance module according to the detection signal.
In some embodiments, the detection module comprises a comparison unit; the first input end of the comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the comparison unit is connected with the first constant voltage node, the output end of the comparison unit is connected with the control module, and the comparison unit is used for determining a detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the first constant voltage node; at this time, step 220 includes the following steps.
(1) And when the detection signal is a first preset level signal, determining that the direction of the working current of the resonance module is a positive direction.
(2) And when the detection signal is not the first preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
Specifically, the first preset level signal includes a high level signal and a low level signal, where the specific high level signal or low level signal of the first preset level signal is determined according to the actual connection relationship of the circuit, which is not limited by the present application.
In some embodiments, the detection module includes a first comparison unit and a second comparison unit; the first input end of the first comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the first comparison unit is connected with the third constant voltage node, the output end of the first comparison unit is connected with the control module, and the first comparison unit is used for determining a first detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the third constant voltage node; the first input end of the second comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the second comparison unit is connected with the fourth constant voltage node, the output end of the second comparison unit is connected with the control module, and the second comparison unit is used for determining a second detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the fourth constant voltage node; at this time, step 220 includes the following steps.
(1) And when the first detection signal is a second preset level signal, determining that the direction of the working current of the resonance module is a positive direction.
(2) And when the second detection signal is a second preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
Specifically, the second preset level signal includes a high level signal and a low level signal, where the specific high level signal or low level signal of the second preset level signal is determined according to the actual connection relationship of the circuit, which is not limited by the present application.
In some embodiments, the direction of the working current includes a positive direction and a negative direction, and specific current directions of the positive direction and the negative direction may be defined by themselves, for example, in the embodiment shown in fig. 6, the direction of the working current may be defined as the positive direction when the current flows from the resonant coil X1 to the resonant transformer unit to the capacitor C1, but it is understood that the specific current directions corresponding to the positive direction and the negative direction are not limited, and the positive direction and the negative direction are only used for distinguishing the current directions.
Step 230: and when the resonance module is determined to work in the capacitive area according to the working state of the driving module and the direction of the working current, executing the protection measures.
In some embodiments, the step of determining that the resonant module is operating in the capacitive zone based on the operating state of the drive module and the direction of the operating current includes the following steps.
(1) And determining the inductive current direction according to the working state of the driving module.
(2) When the direction of the working current is different from the direction of the inductive current, the resonance module is determined to work in the capacitive area.
Specifically, the direction of the inductive current is the direction of the working current of the resonant module when the driving module is in the working state and the resonant module is in the inductive region, so that if the direction of the working current is different from the direction of the inductive current, the resonant module is determined to work in the capacitive region.
In some embodiments, the inductive current direction corresponding to the working state of the driving module may be determined in advance by testing, analyzing, and the like, and stored in the induction heating device in advance, so that the induction heating device may determine the inductive current direction according to the working state of the driving module.
In some embodiments, the driving module includes at least two switching tubes, and the operating state of the driving module includes a switching state of the switching tubes, and a change in an operating current of the resonant module may lag a change in an operating voltage of the resonant module when the resonant module operates in the inductive region.
For example, in the embodiment shown in fig. 6, when the first switching tube IGBT1 is turned on and the second switching tube IGBT2 is turned off, the direction of the operating current is a positive direction, and when the first switching tube IGBT1 is turned from on to off and the second switching tube IGBT2 is turned from off to on, if the resonance module 120 operates in the inductive region, the operating voltage changes, but the operating current is still a positive direction, so when the first switching tube IGBT1 is turned off, the inductive current direction is a positive direction.
For example, in the embodiment shown in fig. 6, when the first switching tube IGBT1 is turned off and the second switching tube IGBT2 is turned on, the direction of the operating current is a negative direction, and when the first switching tube IGBT1 is turned from off to on and the second switching tube IGBT2 is turned from on to off, if the resonance module 120 operates in the inductive region, the operating voltage changes, but the operating current is still a negative direction, so that when the first switching tube IGBT1 is turned on, the inductive current direction is a negative direction.
Thus, in some embodiments, the step of determining that the resonant module is operating in the capacitive zone based on the operating state of the drive module and the direction of the operating current includes the steps described below.
(1) When the change of the working state of the driving module is detected, the inductive current direction is determined according to the change of the working state of the driving module.
(2) When the direction of the working current is different from the direction of the inductive current, the resonance module is determined to work in the capacitive area.
In some embodiments, the step of performing the protective measure includes the following steps.
(1) And increasing the working frequency of the resonance module until the working frequency is greater than the resonance frequency of the resonance module.
In some embodiments, the driving module includes at least two switching tubes, and the operating frequency of the resonance module is a switching frequency of the switching tubes, and the switching frequency of the switching tubes can be controlled by the control module.
The above description has explained that when the operating frequency of the resonant module is less than the resonant frequency, the induction heating device operates in the capacitive region, so increasing the operating frequency of the resonant module may change the operating region of the resonant module from the capacitive region to the inductive region, reducing the switching losses of the drive module.
The present application provides a detection circuit including: the driving module is used for providing driving electric energy; the resonance module is connected with the driving module and is used for carrying out resonance work according to the driving electric energy; the detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module. According to the application, the direction of the working current is determined through the detection signal, so that the resonant module is accurately determined to work in the capacitive area according to the direction of the working current, and the protection measures are executed when the resonant module works in the capacitive area, so that the driving module can be prevented from working when the induction heating equipment works in the capacitive area, the loss of the driving module is reduced, and the heating safety is ensured.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a detection device according to an embodiment of the application. As shown in fig. 6, the detecting device 300 includes: an acquisition unit 310, a determination unit 320, and an execution unit 330.
Wherein, the acquiring unit 310 is configured to acquire the detection signal.
And a determining unit 320 for determining the direction of the operating current of the resonance module according to the detection signal.
And an execution unit 330 for executing a protection measure when it is determined that the resonance module is operated in the capacitive region according to the operation state of the driving module and the direction of the operation current.
Optionally, the execution unit 330 is further configured to determine an inductive current direction according to an operation state of the driving module; when the direction of the working current is different from the direction of the inductive current, the resonance module is determined to work in the capacitive area.
Optionally, the detection module comprises a comparison unit; the first input end of the comparison unit is connected to the first end of the detection mutual inductance unit, the second input end of the comparison unit is connected to the first constant voltage node, the output end of the comparison unit is connected to the control module, and the comparison unit is used for determining detection signals according to the voltage of the first end of the detection mutual inductance unit and the voltage of the first constant voltage node.
At this time, the determining unit 320 is further configured to determine that the direction of the working current of the resonant module is a positive direction when the detection signal is a first preset level signal; and when the detection signal is not the first preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
Optionally, the detection module includes a first comparison unit and a second comparison unit; the first input end of the first comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the first comparison unit is connected with the third constant voltage node, the output end of the first comparison unit is connected with the control module, and the first comparison unit is used for determining a first detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the third constant voltage node; the first input end of the second comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the second comparison unit is connected with the fourth constant voltage node, the output end of the second comparison unit is connected with the control module, and the second comparison unit is used for determining a second detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the fourth constant voltage node.
At this time, the determining unit 320 is further configured to determine that the direction of the working current of the resonant module is a positive direction when the first detection signal is a second preset level signal; and when the second detection signal is a second preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
Optionally, the execution unit 330 is further configured to increase the operating frequency of the resonant module until the operating frequency is greater than the resonant frequency of the resonant module.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an induction heating apparatus according to an embodiment of the application. As shown in fig. 8, the induction heating apparatus 400 includes an apparatus body 410 and the above-mentioned detection circuit 100 disposed on the apparatus body 410.
Alternatively, the induction heating apparatus 400 may be an apparatus having an induction heating function, such as an induction cooker, or the like, to which the present application is not limited.
Referring to fig. 10, fig. 10 is a schematic structural diagram of another induction heating apparatus according to an embodiment of the application. As shown in fig. 10, the induction heating apparatus 500 includes: one or more processors 510 and a memory 520, one processor 510 being illustrated in fig. 10.
In some embodiments, processor 510 and memory 520 may be connected by a bus or otherwise, for example in FIG. 10.
In some embodiments, processor 510 is configured to obtain a detection signal; determining the direction of the working current of the resonance module according to the detection signal; and when the resonance module is determined to work in the capacitive area according to the working state of the driving module and the direction of the working current, executing the protection measures.
In some embodiments, the memory 520 is used as a non-volatile computer readable storage medium, and may be used to store non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions/modules for the detection method in the embodiments of the present application. The processor 510 executes various functional applications of the induction heating apparatus and data processing, i.e., implements the detection method of the above-described method embodiments, by running non-volatile software programs, instructions, and modules stored in the memory 520.
In some embodiments, memory 520 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functionality; the storage data area may store data created from the use of the induction heating apparatus, etc. In addition, memory 520 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 520 may optionally include memory located remotely from processor 510, which may be connected to the controller via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
In some implementations, one or more modules are stored in memory 520 that, when executed by one or more processors 510, perform the detection methods of any of the method embodiments described above, e.g., perform method steps 210 through 230 in fig. 7 described above.
Referring to fig. 11, fig. 11 is a block diagram illustrating a computer readable storage medium according to an embodiment of the present application. The computer readable storage medium 600 has stored therein program code 610, the program code 610 being executable by a processor to perform the detection method described in the above method embodiments.
The computer readable storage medium 600 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. Optionally, the computer readable storage medium comprises a non-volatile computer readable medium (non-transitory computer-readable storage medium). The computer readable storage medium 600 has storage space for program code to perform any of the method steps of the detection method described above. The program code can be read from or written to one or more computer program products. The program code may be compressed, for example, in a suitable form.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as above, which are not provided in details for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (14)
1. A detection circuit, the circuit comprising:
the driving module is used for providing driving electric energy;
the resonance module is connected with the driving module; the resonance module is used for carrying out resonance work according to the driving electric energy and comprises a resonance coil and a resonance mutual inductance unit; the resonance mutual inductance unit is a primary side of the current transformer;
The detection module comprises a detection mutual inductance unit; the detection module is used for determining a detection signal according to the voltage of the detection mutual inductance unit; the detection mutual inductance unit is a secondary side of the current transformer;
The control module is connected with the detection module and the driving module, and is used for determining the direction of the working current of the resonance module according to the detection signal and executing protection measures when the resonance module is determined to work in the capacitive area according to the direction of the working current and the working state of the driving module.
2. The detection circuit of claim 1, wherein the detection module further comprises a comparison unit; wherein,
The first input end of the comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the comparison unit is connected with the first constant voltage node, the output end of the comparison unit is connected with the control module, and the comparison unit is used for determining detection signals according to the voltage of the first end of the detection mutual inductance unit and the voltage of the first constant voltage node.
3. The detection circuit of claim 2, wherein the second terminal of the detection transformer is connected to a second constant voltage node, wherein the voltage of the second constant voltage node is equal to the voltage of the first constant voltage node.
4. The detection circuit of claim 1, wherein the detection module comprises a first comparison unit and a second comparison unit; wherein,
The first input end of the first comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the first comparison unit is connected with a third constant voltage node, the output end of the first comparison unit is connected with the control module, and the first comparison unit is used for determining a first detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the third constant voltage node;
The first input end of the second comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the second comparison unit is connected with a fourth constant voltage node, the output end of the second comparison unit is connected with the control module, and the second comparison unit is used for determining a second detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the fourth constant voltage node;
the control module is used for determining the direction of the working current of the resonance module according to the first detection signal and the second detection signal.
5. The detection circuit of claim 4, wherein the first input of the first comparison unit is a forward input and the first input of the second comparison unit is a reverse input.
6. The detection circuit according to claim 4, wherein the second end of the detection transformer unit is connected to a fifth constant voltage node, the voltage of the fifth constant voltage node is less than or equal to the voltage of the third constant voltage node, and the voltage of the fifth constant voltage node is greater than or equal to the voltage of the fourth constant voltage node.
7. A detection method applied to the detection circuit of claim 1, the method comprising:
Acquiring a detection signal;
determining the direction of the working current of the resonance module according to the detection signal;
And when the resonance module is determined to work in the capacitive area according to the working state of the driving module and the direction of the working current, executing protection measures.
8. The method according to claim 7, wherein determining that the resonance module operates in the capacitive region according to the operation state of the driving module and the direction of the operation current includes:
Determining an inductive current direction according to the working state of the driving module;
and when the direction of the working current is different from the direction of the inductive current, determining that the resonance module works in a capacitive area.
9. The detection method according to claim 7, wherein the detection module includes a comparison unit; wherein,
The first input end of the comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the comparison unit is connected with the first constant voltage node, the output end of the comparison unit is connected with the control module, and the comparison unit is used for determining a detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the first constant voltage node;
The determining the direction of the working current of the resonance module according to the detection signal comprises the following steps:
When the detection signal is a first preset level signal, determining that the direction of the working current of the resonance module is a positive direction;
and when the detection signal is not the first preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
10. The detection method according to claim 7, wherein the detection module includes a first comparison unit and a second comparison unit; wherein,
The first input end of the first comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the first comparison unit is connected with a third constant voltage node, the output end of the first comparison unit is connected with the control module, and the first comparison unit is used for determining a first detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the third constant voltage node;
The first input end of the second comparison unit is connected with the first end of the detection mutual inductance unit, the second input end of the second comparison unit is connected with a fourth constant voltage node, the output end of the second comparison unit is connected with the control module, and the second comparison unit is used for determining a second detection signal according to the voltage of the first end of the detection mutual inductance unit and the voltage of the fourth constant voltage node;
The determining the direction of the working current of the resonance module according to the detection signal comprises the following steps:
When the first detection signal is a second preset level signal, determining that the direction of the working current of the resonance module is a positive direction; and, in addition, the method comprises the steps of,
And when the second detection signal is a second preset level signal, determining that the direction of the working current of the resonance module is a negative direction.
11. The method of claim 7, wherein the performing a protective measure comprises:
and increasing the working frequency of the resonance module until the working frequency is greater than the resonance frequency of the resonance module.
12. An induction heating apparatus, characterized in that it comprises an apparatus body and the detection circuit according to any one of claims 1-8 provided to the apparatus body.
13. An induction heating apparatus, comprising:
at least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the detection method of any one of claims 9-11.
14. A computer readable storage medium having stored thereon computer executable instructions for enabling an induction heating apparatus to perform the detection method of any of claims 9-11.
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| CN202211658701.5A CN118250850A (en) | 2022-12-22 | 2022-12-22 | Detection circuit, method, induction heating apparatus, and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211658701.5A CN118250850A (en) | 2022-12-22 | 2022-12-22 | Detection circuit, method, induction heating apparatus, and storage medium |
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