Microwave oven and control method thereof
地域：
Beijing
摘要
A system and method for safe operation of a microwave oven is disclosed. The heating function of the microwave oven may be automatically disabled upon detection, by the microwave oven, of a metal object entering a heating compartment of the microwave. The detection may be based on magnetic induction. Further, the heating function of the microwave may be automatically enabled and recovered upon detection, by the microwave oven, of a metal object being removed from the heating compartment of the microwave.
說明書
This application claims priority to Chinese Patent Application No. 201510549604.6 filed on Aug. 31, 2015, the entire contents of which are incorporated herein by reference.
The disclosure generally relates to the field of smart home and smart devices, and more particularly, to a smart microwave oven.
A microwave oven is a kitchen appliance used to heat food through microwaves. Similar kitchen appliance further includes optical oven.
Metal objects, folded and irregular foils in particular, may be dangerous for a microwave oven, because metal may reflect microwaves inside the microwave oven and generate sparks that may ignite food and components of the microwave oven. In the related art, a warning label is placed on a microwave oven to prompt a user not to place metal contains or objects in the microwave oven. However, since this warning mechanism relies on consciousness of users, accidents may still happen when children or aged users unaware of the danger make use microwave oven without supervision.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
權(quán)利要求
What is claimed is:1. A microwave oven, comprising:a case body comprising a heating compartment; a master control board disposed in the case body; and a magnetic field generation component and a magnetic field induction component disposed in the heating compartment, wherein the magnetic field generation component generates a magnetic field; wherein the magnetic field induction component is electrically connected to the master control board; wherein the magnetic field induction component is configured to output a first induction signal upon detecting a first change in the magnetic field, and output a second induction signal upon detecting a second change in the magnetic field; wherein the master control board is configured to determine, according to the first induction signal, whether a metal object has entered or is entering the heating compartment, and to disable a heating function of the heating compartment in response to determining that the metal object has entered or is entering the heating compartment; wherein, when determining whether the metal object has entered or is entering the heating compartment according to the first induction signal, the master control board is further configured to detect that the first induction signal increases or decreases gradually, and to determine that the metal object has entered or is entering the heating compartment; wherein the master control board is further configured to determine, according to the second induction signal, whether the metal object has been or is being removed from the heating compartment, and to enable the heating function of the heating compartment in response to determining that the metal object has been or is being removed from the heating compartment; wherein, when determining whether the metal object has been or is being removed from the heating compartment according to the second induction signal, the master control board is further configured to detect that the second induction signal is of an opposite sign to the first induction signal when the metal object enters the heating compartment, and to determine that the metal object has been or is being removed from the heating compartment; a reset button; and wherein the master control board is configured to:detect whether the reset button is pressed, in response to detecting that the reset button is pressed, determine that the metal object has been or is being removed from the heating compartment, and enable the heating function of the heating compartment in response to determining that the metal object has been or is being removed from the heating compartment. 2. The microwave oven of claim 1 , wherein the magnetic field induction component is disposed at an entrance of the heating compartment. 3. The microwave oven of claim 1 , wherein the magnetic field induction component comprises only one magnetic induction sensor. 4. The microwave oven of claim 1 , wherein the magnetic field induction component comprises multiple magnetic field induction sensors. 5. The microwave oven of claim 4 , wherein when the magnetic field induction component comprises multiple magnetic field induction sensors, the master control board is configured to derive a shape and size of the metal object according to a set of first induction signals detected by the multiple magnetic field induction sensors. 6. The microwave oven of claim 1 , wherein the magnetic field induction component is a magneto-resistive sensor. 7. The microwave oven of claim 1 , wherein the magnetic field generation component is a permanent magnet. 8. The microwave oven of claim 1 , wherein the magnetic field generation component is a magnetic coil connected electrically to the master control board. 9. The microwave oven of claim 1 , further comprising a radio communication component connected electrically to the master control board, wherein the radio communication component comprises at least one of a Wireless Fidelity (Wi-Fi) network interface, a Bluetooth interface, and a zigbee interface. 10. The microwave oven of claim 1 , further comprising a display screen connected electrically to the master control board. 11. A control method for operating a microwave oven, comprising:detecting, by a magnetic field induction component disposed at an entrance of a heating compartment of the microwave oven, a first induction signal due to a first change of a magnetic field generated by a magnetic field generation component disposed at the entrance of the heating compartment of the microwave oven; determining, by a master control board electrically connected to the magnetic field induction component, whether a metal object has entered or is entering the heating compartment according to the first induction signal; and disabling, by the master control board, a heating function of the heating compartment in response to determining that a metal object has entered or is entering the heating compartment; wherein the determining by the master control board whether the metal object has entered or is entering the heating compartment according to the first induction signal comprises: detecting, by the master control board, that the first induction signal increases or decreases gradually, and determining, by the master control board, that the metal object has entered or is entering the heating compartment; detecting, by the magnetic field induction component, a second induction signal due to a second change of the magnetic field generated by the magnetic field generation component; determining, by the master control board, whether the metal object has been or is being removed from the heating compartment according to the second induction signal or according to a reset button; and enabling, by the master control board, the heating function of the heating compartment in response to determining by the master control board that the metal object has been or is being removed from the heating compartment; wherein the determining by the master control board whether the metal object has been or is being removed from the heating compartment according to the second induction signal comprises: detecting, by the master control board, that the second induction signal is of an opposite sign to the first induction signal when the metal object enters the heating compartment, and determining, by the master control board, that the metal object has been or is being removed from the heating compartment; wherein the determining by the master control board whether the metal object has been or is being removed from the heating compartment according to the reset button comprises: detecting, by the master control board, whether the reset button is pressed, and in response to detecting that the reset button is pressed, determining, by the master control board, that the metal object has been or is being removed from the heating compartment. 12. The method of claim 11 , further comprising:causing, by the master control board, a radio communication component of the microwave oven connected electrically to the master control board, to send an alarm prompt to a mobile terminal for prompting a user remove the metal object from the heating compartment of the microwave oven, in response to determining by the master control board that a metal object has entered or is entering the heating compartment. 13. The method of claim 11 , further comprising:causing, by the master control board, a display screen of the microwave oven connected electrically to the master control board, to display an alarm prompt for prompting a user to remove the metal object from the heating compartment of the microwave oven, in response to determining by the master control board that a metal object has entered or is entering the heating compartment.
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