Cooking utensil and fault prompting method thereof

Abstract

The invention discloses a cooking utensil and a fault prompting method thereof, and the cooking utensil comprises a first load module which comprises an electromagnetic heating module; the prompting device is used for sending a fault prompting message under the condition that the cooking utensil breaks down; one end of the first switch is connected with one end of the alternating current power supply, the other end of the first switch is connected with the first input end of the rectifying unit, the output end of the rectifying unit is connected with the electromagnetic heating module to supply power to the electromagnetic heating module, and the first switch is used for switching on the electromagnetic heating module under a preset triggering condition. Disconnecting the AC power supply from the rectification unit; and the first power supply unit multiplexes at least part of circuits of the rectifying unit, and the output end of the first power supply unit is connected with the prompting device to supply power to the prompting device. The circuit can maintain the power supply to the prompting device when the power supply to the electromagnetic heating module is cut off.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic heating equipment, and more particularly to a cooking appliance and its fault indication method. Background Technology

[0002] Among various electrical appliances used for heating, electromagnetic heating technology has been widely used due to its advantages of high heat conversion efficiency and rapid heating. For example, in cooking appliances such as air fryers, electromagnetic heating has replaced electric heating as a new development trend. At the same time, the highly interactive nature of cooking appliances like air fryers has brought new power supply requirements to the electrical circuits. For instance, in actual use of air fryers, when the user opens the lid or removes the drum, the high-voltage load power supply to the air fryer needs to be immediately cut off to ensure safety, while simultaneously maintaining power to the circuit board to indicate the current status to the user. However, current related technologies typically stop powering the circuit board simultaneously when the high-voltage load power needs to be cut off. In this case, the air fryer cannot indicate the current status to the user, resulting in a poor user experience. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, the first objective of this invention is to provide a cooking appliance that incorporates a first switch, a rectifier unit, and a first power supply unit. The first switch and the rectifier unit are connected in series and then in parallel across the two ends of the first power supply unit. The first power supply unit reuses a portion of the rectifier unit's circuitry. When the first switch disconnects the AC power supply from the rectifier unit, the first power supply unit can maintain power to a notification device through the reused portion of the circuitry. This allows the power supply circuit to maintain power to the notification device even when power to the electromagnetic heating module is cut off, thus meeting the power supply requirements of highly interactive electromagnetic heating devices and effectively improving the user experience of electromagnetic heating devices. Furthermore, the reuse of a portion of the rectifier unit's circuitry by the first power supply unit simplifies the power supply circuit structure of the cooking appliance, thereby reducing the hardware cost of the power supply circuitry.

[0004] The second objective of this invention is to provide a method for indicating malfunctions in cooking appliances.

[0005] To achieve the above objectives, a first aspect of the present invention provides a cooking appliance, comprising: a first load module including an electromagnetic heating module; a prompting device for issuing a fault prompt message in the event of a malfunction of the cooking appliance; a first switch and a rectifier unit, wherein one end of the first switch is connected to one end of an AC power supply, the other end of the first switch is connected to a first input terminal of the rectifier unit, a second input terminal of the rectifier unit is connected to the other end of the AC power supply, and the output terminal of the rectifier unit is connected to the electromagnetic heating module to supply power to the electromagnetic heating module; the first switch is used to disconnect the AC power supply from the rectifier unit under a preset trigger condition; and a first power supply unit, wherein a first input terminal of the first power supply unit is connected to one end of the AC power supply and one end of the first switch, a second input terminal of the first power supply unit is connected to the other end of the AC power supply, the first power supply unit reuses at least a portion of the circuitry of the rectifier unit, and the output terminal of the first power supply unit is connected to the prompting device to supply power to the prompting device.

[0006] According to an embodiment of the present invention, a cooking appliance is provided with a first switch, a rectifier unit, and a first power supply unit. The first switch and the rectifier unit are connected in series and then in parallel across the two ends of the first power supply unit. The first power supply unit reuses part of the circuit of the rectifier unit. When the first switch disconnects the AC power supply from the rectifier unit, the first power supply unit can maintain power supply to the controller through the reused part of the circuit. This allows the power supply circuit to maintain power supply to the prompting device when the power supply to the electromagnetic heating module is cut off, thereby meeting the power supply requirements of highly interactive electromagnetic heating devices and effectively improving the user experience of electromagnetic heating devices. At the same time, the reuse of part of the circuit of the rectifier unit by the first power supply unit can simplify the power supply circuit structure of the cooking appliance, thereby reducing the hardware cost of the power supply circuit.

[0007] According to one embodiment of the present invention, the first output terminal of the rectifier unit and the first output terminal of the first power supply unit share a common ground, and the first power supply unit reuses at least a portion of the circuitry of the rectifier unit through ground.

[0008] According to one embodiment of the present invention, the first power supply unit includes: a first diode, a second diode, and a switching power supply circuit. The anode of the first diode serves as the first input terminal of the first power supply unit, and the cathode of the first diode is connected to the first input terminal of the switching power supply circuit. The anode of the second diode serves as the second input terminal of the first power supply unit, and the cathode of the second diode is connected to the second input terminal of the switching power supply circuit. The output terminal of the switching power supply circuit serves as the output terminal of the first power supply unit.

[0009] According to one embodiment of the present invention, the switching power supply circuit is a non-isolated switching power supply circuit.

[0010] According to one embodiment of the present invention, the rectifier unit includes: a first switch, a second switch, a third switch, and a fourth switch. One end of the first switch and one end of the second switch are connected to serve as the first output terminal of the rectifier unit. The other end of the first switch and one end of the third switch are connected to serve as the first input terminal of the rectifier unit. The other end of the second switch and one end of the fourth switch are connected to serve as the second input terminal of the rectifier unit. The other end of the third switch and the other end of the fourth switch are connected to serve as the second output terminal of the rectifier unit. When the first switch is not open, the first power supply unit reuses the first switch and the fourth switch; when the first switch is open, the first power supply unit reuses the fourth switch.

[0011] According to one embodiment of the present invention, the first switch, the second switch, the third switch and the fourth switch are all diodes, with the anode of each diode serving as one end of the corresponding switch and the cathode of each diode serving as the other end of the corresponding switch.

[0012] According to one embodiment of the present invention, the cooking appliance further includes a second load module and a second power supply unit. The first input terminal of the second power supply unit is connected to the other end of the first switch, the second input terminal of the second power supply unit is connected to the other end of the AC power supply, and the output terminal of the second power supply unit is connected to the second load module to supply power to the second load module.

[0013] According to one embodiment of the present invention, the cooking appliance further includes a detection unit and a controller. The detection unit is used to detect the power supply status of the rectifier unit and output a corresponding detection signal. The controller is connected to the output terminal of the first power supply unit, the prompting device and the detection unit respectively, and is used to determine the on / off state of the first switch based on the detection signal. When the first switch is on, the controller controls the prompting device to issue a fault prompt message.

[0014] According to one embodiment of the present invention, the detection unit includes: a zero-crossing detection circuit, the input terminal of which is connected to the other end of the first switch, for detecting the zero-crossing point of the AC power supply and outputting a corresponding zero-crossing detection signal, wherein the controller determines the on / off state of the first switch based on the zero-crossing detection signal.

[0015] According to one embodiment of the present invention, the electromagnetic heating module includes a coil disk, and the detection unit includes a synchronous voltage detection circuit connected to the coil disk for detecting the voltage of the coil disk and outputting a corresponding voltage detection signal, wherein the controller determines the on / off state of the first switch based on the voltage detection signal.

[0016] According to one embodiment of the present invention, the first switch is a micro switch.

[0017] According to one embodiment of the present invention, the prompting device includes at least one of a display device and a sound device.

[0018] According to one embodiment of the present invention, the cooking appliance is an air fryer.

[0019] To achieve the above objectives, a second aspect of the present invention provides a method for indicating a fault in a cooking appliance. The cooking appliance includes a first load module, an indication device, a first switch, a rectifier unit, a first power supply unit, and a detection unit. The first load module includes an electromagnetic heating module. The indication device is used to issue a fault indication message when the cooking appliance malfunctions. One end of the first switch is connected to one end of an AC power supply, and the other end of the first switch is connected to the first input terminal of the rectifier unit. The second input terminal of the rectifier unit is connected to the other end of the AC power supply. The output terminal of the rectifier unit is connected to the electromagnetic heating module to supply power to the electromagnetic heating module. The first switch is used to disconnect the AC power supply from the rectifier unit under a preset trigger condition. The first input terminal of the first power supply unit is connected to one end of the AC power supply and one end of the first switch, respectively. The second input terminal of the first power supply unit is connected to the other end of the AC power supply. The first power supply unit reuses at least a portion of the circuitry of the rectifier unit. The output terminal of the first power supply unit is connected to the indication device to supply power to the indication device. The detection unit is used to detect the power supply status of the rectifier unit and output a corresponding detection signal. The method includes: determining the on / off state of the first switch based on the detection signal; and controlling the indication device to issue a fault indication message when the first switch is on.

[0020] According to the fault indication method for cooking appliances of the present invention, by means of a first switch, a rectifier unit and a first power supply unit, the cooking appliance can maintain the power supply of the indication device while cutting off the power supply of the electromagnetic heating module. Therefore, when it is determined that the first switch is on, the indication device can be controlled to issue a fault indication message, which effectively improves the user experience of the cooking appliance.

[0021] According to one embodiment of the present invention, the detection unit includes a zero-crossing detection circuit, the input terminal of which is connected to the other end of the first switch, for detecting the zero-crossing point of the AC power supply and outputting a corresponding zero-crossing detection signal, wherein determining the on / off state of the first switch based on the detection signal includes: determining the on / off state of the first switch based on the zero-crossing detection signal.

[0022] According to one embodiment of the present invention, the electromagnetic heating module includes a coil disk, and the detection unit includes a synchronous voltage detection circuit connected to the coil disk for detecting the voltage of the coil disk and outputting a corresponding voltage detection signal. The determination of the on / off state of the first switch based on the detection signal includes: determining the on / off state of the first switch based on the voltage detection signal.

[0023] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a cooking appliance according to an embodiment of the present invention;

[0025] Figure 2 A circuit diagram of a first power supply unit and a rectifier unit according to an embodiment of the present invention;

[0026] Figure 3 A circuit diagram of a cooking appliance according to another embodiment of the present invention;

[0027] Figure 4 A circuit diagram of a cooking appliance according to yet another embodiment of the present invention;

[0028] Figure 5 This is a flowchart illustrating a method for indicating faults in a cooking appliance according to an embodiment of the present invention. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following description, with reference to the accompanying drawings, describes the cooking appliances and their fault indication methods proposed in the embodiments of the present invention.

[0031] Figure 1 This is a schematic diagram of the structure of a cooking appliance according to an embodiment of the present invention, with reference to... Figure 1 As shown, the cooking appliance 100 includes: a first load module 110, a prompting device 120, a first switch S1, a rectifier unit 210, and a first power supply unit 220.

[0032] The first load module 110 includes an electromagnetic heating module 111; the prompting device 120 is used to issue a fault prompt message when the cooking appliance 100 malfunctions; one end of the first switch S1 is connected to one end of the AC power supply VAC, the other end of the first switch S1 is connected to the first input terminal of the rectifier unit 210, the second input terminal of the rectifier unit 210 is connected to the other end of the AC power supply VAC, the output terminal of the rectifier unit 210 is connected to the electromagnetic heating module 111 to supply power to the electromagnetic heating module 111, and the first switch S1 is used to disconnect the AC power supply VAC from the rectifier unit 210 under a preset trigger condition; the first input terminal of the first power supply unit 220 is connected to one end of the AC power supply VAC and one end of the first switch S1, the second input terminal of the first power supply unit 220 is connected to the other end of the AC power supply VAC, the first power supply unit 220 reuses at least part of the circuit of the rectifier unit 210, and the output terminal of the first power supply unit 220 is connected to the prompting device 120 to supply power to the prompting device 120. Specifically, the electromagnetic heating module 111 is a heating element that converts electrical energy into heat energy. Therefore, the electromagnetic heating module 111 requires high power and typically requires a high-voltage, high-power DC power supply. The indicator device 120, located on a circuit board, typically requires a low-voltage, low-power DC power supply. The first switch S1, the rectifier unit 210, and the first power supply unit 220 constitute the power supply circuit 200 of the cooking appliance 100. To meet the two power supply requirements mentioned above, the power supply circuit 200 is equipped with corresponding current conversion circuits. The specific operation of the power supply circuit 200 is as follows: (Refer to...) Figure 1 As shown, when the power supply circuit 200 is working normally, the first switch S1 is not open, and the first input terminal of the rectifier unit 210 is connected to one end of the AC power supply VAC through the first switch S1. At this time, the rectifier unit 210 can convert the AC power output from the AC power supply VAC into high-voltage, high-power DC power to supply power to the electromagnetic heating module 111. The two input terminals of the first power supply unit 220 are directly connected to the two ends of the AC power supply VAC, and the first power supply unit 220 can reuse part or all of the circuit of the rectifier unit 210 to form a power supply loop to convert the AC power output from the AC power supply VAC into low-voltage, low-power DC power to supply power to the indicator device 120. Thus, the power supply circuit 200 can meet the two power supply needs of the cooking appliance 100.

[0033] Continue to refer to Figure 1As shown, the rectifier unit 210 is connected in series with the first switch S1 and then in parallel across the two ends of the first power supply unit 200. Therefore, when the first switch S1 is opened upon reaching a preset trigger condition, the first input terminal of the rectifier unit 210 is disconnected from one end of the AC power supply VAC, causing the electromagnetic heating module 111 to lose power and stop working. The preset trigger condition can be set in various ways, such as when the user operates the electromagnetic heating device according to a preset method, the first switch S1 is opened, or when the cooking appliance 100 malfunctions, the first switch S1 is opened. No specific restrictions are imposed here. Simultaneously, since the first power supply unit 220 reuses part of the circuit of the rectifier unit 210 after the first switch S1 is opened, and the second input terminal of the first power supply unit 220 remains connected to the second input terminal of the rectifier unit 210, the first power supply unit 220 can still form a power supply circuit with part of the circuit of the rectifier unit 210, and the first power supply unit 220 can still maintain power supply to the indicator device 120. Thus, the power supply circuit 200 maintains power supply to the prompting device 120 when the first switch S1 disconnects the AC power supply VAC from the rectifier unit 210.

[0034] In related technologies, because the power supply circuit of cooking appliances does not have a dedicated power supply circuit for the electromagnetic heating module 111 and the indicator device 120, the power supply circuit can usually only supply power to the electromagnetic heating module 111 and the indicator device 120 simultaneously or de-energize them simultaneously. Therefore, the power supply circuit in related technologies cannot meet the interactive requirements of cooking appliances. However, in this embodiment of the invention, by setting a first switch S1, and having the first power supply unit 220 and the rectifier unit 210 share part of the circuit, the power supply to the electromagnetic heating module 111 is disconnected while the power supply to the indicator device 120 is maintained, thus meeting the power supply requirements of the highly interactive cooking appliance 100 and improving the user experience. At the same time, the setting of the multiplexed circuit also makes the structure of the power supply circuit 200 simpler, eliminating the need to set up a dedicated power supply circuit for the electromagnetic heating module 111 and the indicator device 120, thereby effectively reducing the hardware cost of the power supply circuit 200.

[0035] It should be noted that the first load module 110 may also include other types of loads, such as a second heat source for auxiliary heating, etc., which are not limited here.

[0036] In the above embodiments, by setting a first switch, a rectifier unit, and a first power supply unit, wherein the first switch and the rectifier unit are connected in series and then connected in parallel across the two ends of the first power supply unit, and the first power supply unit reuses part of the circuit of the rectifier unit, when the first switch disconnects the AC power supply from the rectifier unit, the first power supply unit can maintain power supply to the prompting device through the reused part of the circuit, thereby enabling the power supply circuit to maintain power supply to the prompting device when the power supply to the electromagnetic heating module is cut off, so as to meet the power supply requirements of the highly interactive electromagnetic heating device, effectively improving the user experience of the electromagnetic heating device. At the same time, the reuse of part of the rectifier unit's circuit by the first power supply unit can simplify the power supply circuit structure, thereby reducing the hardware cost of the power supply circuit.

[0037] Furthermore, in some embodiments, the cooking appliance 100 is an air fryer.

[0038] It should be noted that the cooking appliance 100 of this embodiment is not limited to an air fryer, but can also be other appliances with an electromagnetic heating module 111, and no specific limitation is made here.

[0039] Optionally, the first switch S1 is a micro switch.

[0040] Specifically, a micro switch is a switching device that disconnects upon detecting a minute force, making the cooking appliance 100 more sensitive to various triggering conditions. For example, when the cooking appliance 100 is an air fryer, the micro switch can immediately disconnect the power supply to the rectifier unit 210 when the user just pulls out the lid or opens the basket, ensuring user safety and thus improving the safety performance of the electromagnetic heating device 100.

[0041] In some embodiments, reference Figure 2 As shown, the first output terminal of the rectifier unit 210 and the first output terminal of the first power supply unit 220 share a common ground GND, and the first power supply unit 220 reuses at least a portion of the circuitry of the rectifier unit 210 through ground GND.

[0042] Specifically, connecting the first output terminal of the rectifier unit 210 and the first output terminal of the first power supply unit 220 to the same ground (GND) generates a more stable power supply voltage for the indicator device 120, thereby improving the reliability of the cooking appliance 100. Furthermore, during the operation of the cooking appliance 100, the controller 140 needs to collect parameters such as the current and voltage of the electromagnetic heating module 111. The power supply voltage of the controller 140 affects the accuracy of the data collection, which in turn affects the operating efficiency of the electromagnetic heating device 100. Therefore, when the first power supply unit 220 supplies power to the controller 140, the impact of the controller 140's power supply voltage on current collection can be reduced, thereby improving the operating efficiency of the cooking appliance 100.

[0043] Further reference Figure 2As shown, the first power supply unit 220 includes: a first diode D1, a second diode D2, and a switching power supply circuit 221. The anode of the first diode D1 serves as the first input terminal of the first power supply unit 220, and the cathode of the first diode D1 is connected to the first input terminal of the switching power supply circuit 221. The anode of the second diode D2 serves as the second input terminal of the first power supply unit 220, and the cathode of the second diode D2 is connected to the second input terminal of the switching power supply circuit 221. The output terminal of the switching power supply circuit 221 serves as the output terminal of the first power supply unit 220.

[0044] Furthermore, the switching power supply circuit 221 is a non-isolated switching power supply circuit.

[0045] Specifically, the first diode D1 and the second diode D2 can form a bridge rectifier circuit by sharing part of the rectifier unit 210's circuitry with the ground terminal multiplexed, to convert the AC power input from the AC power supply VAC into DC power. Subsequently, the switching power supply circuit 221 can step down the converted DC power to generate low-voltage DC power and provide it to the indicator device 120. Since the isolated switching power supply circuit generates two independent ground terminals on the AC and DC sides, it may affect the sampling accuracy of the controller 140 and interfere with the heating of the electromagnetic heating module 111. Furthermore, the isolated switching power supply circuit cannot share part of the rectifier unit 210's circuitry via a common ground. Therefore, the power supply circuit 221 can be a non-isolated switching power supply circuit to improve the operating efficiency of the electromagnetic heating device 100, such as a BUCK circuit or a BOOST-BUCK circuit. The specific principle of the non-isolated switching power supply circuit will not be elaborated here.

[0046] In some embodiments, reference Figure 2 As shown, the rectifier unit 210 includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. One end of the first switch Q1 and one end of the second switch Q2 are connected to serve as the first output terminal of the rectifier unit 210. The other end of the first switch Q1 and one end of the third switch Q3 are connected to serve as the first input terminal of the rectifier unit 210. The other end of the second switch Q2 and one end of the fourth switch Q4 are connected to serve as the second input terminal of the rectifier unit 210. The other end of the third switch Q3 and the other end of the fourth switch Q4 are connected to serve as the second output terminal of the rectifier unit 210. When the first switch S1 is not open, the first power supply unit 220 reuses the first switch Q1 and the fourth switch Q4. When the first switch S1 is open, the first power supply unit 220 reuses the fourth switch Q4.

[0047] Furthermore, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 are all diodes, with the anode of each diode serving as one end of the corresponding switch and the cathode of each diode serving as the other end of the corresponding switch.

[0048] Specifically, the first to fourth switching transistors Q1 to Q4 can be various types of switching transistors, such as diodes, transistors, MOSFETs, etc. Figure 2 When all the transistors shown are diodes, the first to fourth switching transistors Q1 to Q4 form a bridge uncontrolled rectifier circuit. When the first to fourth switching transistors Q1 to Q4 are switching devices such as MOSFETs, the first switching transistors Q1 to the fourth switching transistors Q4 form a bridge controlled rectifier circuit. The specific principle of the bridge rectifier circuit will not be elaborated here. The following explanation uses the first to fourth switching transistors Q1 to Q4 as diodes to illustrate the working principle of the first power supply unit 220: (Refer to...) Figure 2 As shown, when the first switch S1 is not open, during the half-cycle when a positive voltage is output at one end of the AC power supply VAC (hereinafter referred to as the positive half-cycle), the current can start from one end of the AC power supply VAC, pass through the first diode D1, the switching power supply circuit 221, ground GND, and the fourth switch Q4, and return to the other end of the AC power supply VAC to form a current loop; during the half-cycle when a positive voltage is output at the other end of the AC power supply VAC (hereinafter referred to as the negative half-cycle), the current can start from the other end of the AC power supply VAC, pass through the second diode D2, the switching power supply circuit 221, ground GND, the first switch Q1, and the first switch S1, and return to one end of the AC power supply VAC to form a current loop. Thus, the first power supply unit 220 realizes part of the circuit of the aforementioned multiplexing rectifier unit 210, and constitutes the function of a bridge rectifier circuit. When the first switch S1 is open, the first power supply unit 220 can work normally during the positive half-cycle of the AC power supply VAC. During the negative half-cycle, the first power supply unit 220 will stop working due to the opening of the first switch S1. Therefore, during the period when the first switch S1 is open, the first power supply unit 220 can maintain the normal low-voltage DC output voltage, the output power is halved, but it can still maintain the normal operation of the prompting device 120.

[0049] In some embodiments, reference Figure 3 As shown, the cooking appliance 100 also includes a second load module 130 and a second power supply unit 230. The first input terminal of the second power supply unit 230 is connected to the other end of the first switch S1, the second input terminal of the second power supply unit 230 is connected to the other end of the AC power supply VAC, and the output terminal of the second power supply unit 230 is connected to the second load module 130 to supply power to the second load module 130.

[0050] Specifically, the second load module 130 may include other high-voltage loads such as a fan motor and corresponding drive circuits. The cooking appliance 100 can achieve various functions through the second load module 130, such as using a fan to control the direction of heat flow to improve heating effect, etc., without limitation. (Reference) Figure 3 As shown, the second power supply unit 230 is also part of the power supply circuit 200. The second power supply unit 230 is connected in parallel across the rectifier unit 210. When the first switch S1 is not open, the second power supply unit 230 can convert the AC power output from the AC power supply VAC into DC power of different voltage values ​​to power the second load module 130 in the electromagnetic heating device 100, making the power supply capability of the power supply circuit 200 more comprehensive. Simultaneously, when a preset trigger condition is met, the first switch S1 can synchronously cut off the power supply to the second load module 130, causing the second load module 130 to stop working, ensuring user safety, and thus improving the safety of the power supply circuit 200.

[0051] In some embodiments, reference Figure 3 or Figure 4 As shown, the cooking appliance 100 also includes a detection unit 240 and a controller 140. The detection unit 240 is used to detect the power supply status of the rectifier unit 210 and output a corresponding detection signal. The controller 140 is connected to the first power supply unit 220, the prompting device 120 and the detection unit 240 respectively. It is used to determine the on / off state of the first switch S1 based on the detection signal, and when the first switch S1 is on, it controls the prompting device 120 to issue a fault prompt message.

[0052] Specifically, the power supply circuit 200 can also detect the power supply status of the rectifier unit 210 through the detection unit 240 and output a corresponding detection signal. The controller 140 can determine the on / off state of the first switch S1 based on the detection signal and report it to the user to meet the high interactivity requirements of the electromagnetic heating device 100. Furthermore, when the first switch S1 is on, the controller 140 can also control the prompting device 120 to issue a fault prompt message to promptly remind the user that the cooking appliance 100 has malfunctioned. For example, when the cooking appliance 100 malfunctions, the first switch S1 is off, and the controller 140, upon detecting that the first switch S1 is on, controls the prompting device 120 to issue a fault prompt message.

[0053] Furthermore, in some embodiments, the prompting device 120 includes at least one of a display device and a sound device.

[0054] Specifically, the display device can be a light-emitting diode, a display screen, or other similar device, and the sound device can be a buzzer or other similar device. Assuming the prompting device 120 is a display screen, when the first switch S1 is open, the controller 140 can control the display screen to show fault information.

[0055] In an alternative implementation, when the prompting device 120 is a display screen, the controller can also be used to generate a prompt message based on the malfunction of the cooking appliance 100 and control the display screen to display the prompt message, so that the user can proceed with the next step based on the prompt message.

[0056] Optional, continue to refer to Figure 3 As shown, the detection unit 240 includes a zero-crossing detection circuit 241. The input terminal of the zero-crossing detection circuit 241 is connected to the other end of the first switch S1. It is used to detect the zero-crossing point of the AC power supply VAC and output the corresponding zero-crossing detection signal. The controller 140 determines the on / off state of the first switch S1 based on the zero-crossing detection signal.

[0057] Specifically, the zero-crossing detection circuit 241 may include comparators, optocouplers, etc., and is mainly used to detect the zero-crossing point of the AC power supply VAC and generate a corresponding waveform as a zero-crossing detection signal. For example, the zero-crossing detection circuit 241 can generate a pulse signal when a zero-crossing point is detected, so that the controller 140 can determine the zero-crossing point. In the power supply circuit 200, reference... Figure 3 As shown, the zero-crossing detection circuit 241 is located between the other end of the first switch S1 and the first input terminal of the rectifier unit 210. Therefore, when the first switch S1 is not open, the zero-crossing detection circuit 241 can detect two zero-crossing points of the voltage in each cycle of the AC power supply VAC and output the corresponding zero-crossing detection signal. When the first switch S1 is open, the rectifier unit 210 cannot be connected to the AC power supply VAC, and the zero-crossing detection circuit 241 cannot detect the zero-crossing point until the first switch S1 is turned on again. Therefore, the controller 140 can determine the on / off state of the first switch S1 based on the change in the zero-crossing detection signal.

[0058] Optional, see reference Figure 4 As shown, the electromagnetic heating module 111 includes a coil disk H, and the detection unit 240 includes a synchronous voltage detection circuit 242. The synchronous voltage detection circuit 242 is connected to the coil disk H and is used to detect the voltage of the coil disk H and output a corresponding voltage detection signal. The controller 140 determines the on / off state of the first switch S1 based on the voltage detection signal.

[0059] Specifically, refer to Figure 4As shown, the electromagnetic heating module 111 may include a current detection module 1111, a coil disk H, and an IGBT module IGBT1. The current detection circuit 1111 is connected to the controller 140 and is mainly used to detect the current of the electromagnetic heating module. The coil disk H and the IGBT module IGBT1 are used to implement the heating function. By controlling the on / off timing of the IGBT module IGBT1, eddy currents can be generated in the coil disk H, thereby converting the electrical energy of the DC power input from the rectifier unit 210 into heat energy. The specific principle is not elaborated here. When the first switch S1 is not open and the electromagnetic heating module 111 is working normally, the voltage at the LIN and LOUT terminals of the coil disk H will fluctuate continuously. Therefore, referring to... Figure 4 As shown, the synchronous voltage detection circuit 242 can be connected to both ends of the coil disk H to detect the voltage of the coil disk H and output a corresponding voltage detection signal. When the first switch S1 is open, the voltage at both ends of the coil disk H disappears, and the voltage detection signal output by the synchronous voltage detection circuit 242 also returns to zero. Therefore, the controller 140 can determine the on / off state of the first switch S1 based on the voltage detection signal output by the synchronous voltage detection circuit 242, and thus determine the working state of the rectifier unit 210.

[0060] Optionally, the synchronous voltage detection circuit 242 can be connected only to the LIN terminal of the coil disk H. Since the on / off state of the IGBT module IGBT1 is unknown when the first switch S1 is open, the voltage at the LOUT terminal cannot provide real-time feedback on the voltage state of the coil disk. The voltage at the LIN terminal will change according to the operating state of the rectifier unit 210. Therefore, the synchronous voltage detection circuit 242 can be connected only to the LIN terminal of the coil disk H, thereby reducing the need for a voltage sampling circuit and reducing the hardware cost of the synchronous power supply circuit 200.

[0061] Preferably, since the on / off timing of the IGBT1 module in the electromagnetic heating module 111 usually needs to be determined based on the voltage across the coil disk H, the electromagnetic heating module 111 is usually equipped with a synchronous voltage detection circuit to detect the voltage across the coil disk. Therefore, the power supply circuit 200 can directly utilize the existing synchronous voltage detection circuit to further save hardware costs.

[0062] Optional, see reference Figure 4 As shown, the power supply circuit 200 also includes a protection unit 250, which may include a fuse, an EMC filter circuit, and a varistor. The fuse is used to provide overcurrent protection for the AC power input VAC, the EMC filter circuit is used to perform EMC filtering, and the varistor is used to provide overvoltage protection. This allows the power supply circuit 200 to be directly connected to the mains power grid and improves the safety of the power supply circuit 200. The specific circuit and protection principle of the protection unit 250 will not be elaborated here.

[0063] In summary, the cooking appliance according to the embodiments of the present invention, by setting a first switch, a rectifier unit, and a first power supply unit, wherein the first switch and the rectifier unit are connected in series and then connected in parallel across the two ends of the first power supply unit, and the first power supply unit reuses part of the circuit of the rectifier unit, when the first switch disconnects the AC power supply from the rectifier unit, the first power supply unit can maintain power supply to the prompting device through the reused part of the circuit, thereby enabling the power supply circuit to maintain power supply to the prompting device when the power supply to the electromagnetic heating module is cut off, thus meeting the power supply requirements of highly interactive electromagnetic heating devices, effectively improving the user experience of electromagnetic heating devices. At the same time, the reuse of part of the circuit of the rectifier unit by the first power supply unit can simplify the power supply circuit structure of the cooking appliance, thereby reducing the hardware cost of the power supply circuit.

[0064] Corresponding to the above embodiments, this invention also provides a method for indicating a fault in a cooking appliance. The cooking appliance includes a first load module, an indication device, a first switch, a rectifier unit, a first power supply unit, and a detection unit. The first load module includes an electromagnetic heating module. The indication device is used to issue a fault indication message when the cooking appliance malfunctions. One end of the first switch is connected to one end of an AC power supply, and the other end of the first switch is connected to the first input terminal of the rectifier unit. The second input terminal of the rectifier unit is connected to the other end of the AC power supply. The output terminal of the rectifier unit is connected to the electromagnetic heating module to supply power to the electromagnetic heating module. The first switch is used to disconnect the AC power supply from the rectifier unit under a preset trigger condition. The first input terminal of the first power supply unit is connected to one end of the AC power supply and one end of the first switch, respectively. The second input terminal of the first power supply unit is connected to the other end of the AC power supply. The first power supply unit reuses at least part of the circuitry of the rectifier unit. The output terminal of the first power supply unit is connected to the indication device to supply power to the indication device. The detection unit is used to detect the power supply status of the rectifier unit and output a corresponding detection signal. Figure 5 As shown, the method includes:

[0065] S101, determine the on / off state of the first switch based on the detection signal.

[0066] S102, when the first switch is turned on, the control prompting device issues a fault prompt message.

[0067] According to one embodiment of the present invention, the detection unit includes a zero-crossing detection circuit, the input terminal of which is connected to the other end of the first switch, for detecting the zero-crossing point of the AC power supply and outputting a corresponding zero-crossing detection signal, wherein determining the on / off state of the first switch based on the detection signal includes: determining the on / off state of the first switch based on the zero-crossing detection signal.

[0068] According to one embodiment of the present invention, the electromagnetic heating module includes a coil disk, and the detection unit includes a synchronous voltage detection circuit connected to the coil disk for detecting the voltage of the coil disk and outputting a corresponding voltage detection signal. The determination of the on / off state of the first switch based on the detection signal includes: determining the on / off state of the first switch based on the voltage detection signal.

[0069] According to the fault indication method for cooking appliances of the present invention, by means of a first switch, a rectifier unit and a first power supply unit, the cooking appliance can maintain the power supply of the indication device while cutting off the power supply of the electromagnetic heating module. Therefore, when it is determined that the first switch is on, the indication device can be controlled to issue a fault indication message, which effectively improves the user experience of the cooking appliance.

[0070] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0071] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0072] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cooking utensil, characterized in that, include: The first load module includes an electromagnetic heating module; A prompting device is used to issue a fault prompt message in the event of a malfunction in the cooking appliance; A first switch and a rectifier unit, one end of the first switch is connected to one end of the AC power supply, the other end of the first switch is connected to the first input terminal of the rectifier unit, the second input terminal of the rectifier unit is connected to the other end of the AC power supply, and the output terminal of the rectifier unit is connected to the electromagnetic heating module to supply power to the electromagnetic heating module. The first switch is used to disconnect the AC power supply from the rectifier unit under a preset trigger condition. The first power supply unit has a first input terminal connected to one end of the AC power supply and one end of the first switch, a second input terminal connected to the other end of the AC power supply, and multiplexes at least part of the circuit of the rectifier unit. The output terminal of the first power supply unit is connected to the prompting device to supply power to the prompting device.

2. The cooking utensil according to claim 1, characterized in that, The first output terminal of the rectifier unit and the first output terminal of the first power supply unit share a common ground, and the first power supply unit reuses at least a portion of the circuitry of the rectifier unit through the ground.

3. The cooking utensil according to claim 2, characterized in that, The first power supply unit includes a first diode, a second diode, and a switching power supply circuit. The anode of the first diode serves as the first input terminal of the first power supply unit, and the cathode of the first diode is connected to the first input terminal of the switching power supply circuit. The anode of the second diode serves as the second input terminal of the first power supply unit, and the cathode of the second diode is connected to the second input terminal of the switching power supply circuit. The output terminal of the switching power supply circuit serves as the output terminal of the first power supply unit.

4. The cooking utensil according to claim 3, characterized in that, The switching power supply circuit is a non-isolated switching power supply circuit.

5. The cooking utensil according to any one of claims 2-4, characterized in that, The rectifier unit includes a first switch, a second switch, a third switch, and a fourth switch. One end of the first switch and one end of the second switch are connected to serve as the first output terminal of the rectifier unit. The other end of the first switch and one end of the third switch are connected to serve as the first input terminal of the rectifier unit. The other end of the second switch and one end of the fourth switch are connected to serve as the second input terminal of the rectifier unit. The other end of the third switch and the other end of the fourth switch are connected to serve as the second output terminal of the rectifier unit. Wherein, when the first switch is not turned off, the first power supply unit reuses the first switch transistor and the fourth switch transistor; when the first switch is turned off, the first power supply unit reuses the fourth switch transistor.

6. The cooking utensil according to claim 5, characterized in that, The first switch, the second switch, the third switch, and the fourth switch are all diodes, with the anode of each diode serving as one end of the corresponding switch and the cathode of each diode serving as the other end of the corresponding switch.

7. The cooking utensil according to any one of claims 1-4, characterized in that, The cooking appliance also includes a second load module and a second power supply unit. The first input terminal of the second power supply unit is connected to the other end of the first switch, the second input terminal of the second power supply unit is connected to the other end of the AC power supply, and the output terminal of the second power supply unit is connected to the second load module to supply power to the second load module.

8. The cooking utensil according to any one of claims 1-4, characterized in that, The cooking appliance further includes a detection unit and a controller. The detection unit is used to detect the power supply status of the rectifier unit and output a corresponding detection signal. The controller is connected to the output terminal of the first power supply unit, the prompting device and the detection unit respectively. It is used to determine the on / off status of the first switch based on the detection signal, and control the prompting device to issue the fault prompt message when the first switch is on.

9. The cooking utensil according to claim 8, characterized in that, The detection unit includes a zero-crossing detection circuit, the input of which is connected to the other end of the first switch, for detecting the zero-crossing point of the AC power supply and outputting a corresponding zero-crossing detection signal, wherein the controller determines the on / off state of the first switch based on the zero-crossing detection signal.

10. The cooking utensil according to claim 8, characterized in that, The electromagnetic heating module includes a coil disk, and the detection unit includes a synchronous voltage detection circuit connected to the coil disk for detecting the voltage of the coil disk and outputting a corresponding voltage detection signal. The controller determines the on / off state of the first switch based on the voltage detection signal.

11. The cooking utensil according to any one of claims 1-4, characterized in that, The first switch is a micro switch.

12. The cooking utensil according to any one of claims 1-4, characterized in that, The prompting device includes at least one of a display device and a sound device.

13. The cooking utensil according to claim 1, characterized in that, The cooking appliance is an air fryer.

14. A method for indicating faults in a cooking appliance, characterized in that, The cooking appliance includes a first load module, a prompting device, a first switch, a rectifier unit, a first power supply unit, and a detection unit. The first load module includes an electromagnetic heating module. The prompting device is used to issue a fault prompt message when the cooking appliance malfunctions. One end of the first switch is connected to one end of an AC power supply, and the other end of the first switch is connected to the first input terminal of the rectifier unit. The second input terminal of the rectifier unit is connected to the other end of the AC power supply. The output terminal of the rectifier unit is connected to the electromagnetic heating module to supply power to the electromagnetic heating module. The first switch is used to disconnect the AC power supply from the rectifier unit under a preset trigger condition. The first input terminal of the first power supply unit is connected to one end of the AC power supply and one end of the first switch, respectively. The second input terminal of the first power supply unit is connected to the other end of the AC power supply. The first power supply unit reuses at least a portion of the circuitry of the rectifier unit. The output terminal of the first power supply unit is connected to the prompting device to supply power to the prompting device. The detection unit is used to detect the power supply status of the rectifier unit and output a corresponding detection signal. The method includes: The on / off state of the first switch is determined based on the detection signal; When the first switch is turned on, the prompting device is controlled to issue the fault prompt message.

15. The method according to claim 14, characterized in that, The detection unit includes a zero-crossing detection circuit. The input terminal of the zero-crossing detection circuit is connected to the other end of the first switch. It is used to detect the zero-crossing point of the AC power supply and output a corresponding zero-crossing detection signal. Determining the on / off state of the first switch based on the detection signal includes: The on / off state of the first switch is determined based on the zero-crossing detection signal.

16. The method according to claim 14, characterized in that, The electromagnetic heating module includes a coil disk, and the detection unit includes a synchronous voltage detection circuit connected to the coil disk. The synchronous voltage detection circuit detects the voltage of the coil disk and outputs a corresponding voltage detection signal. Determining the on / off state of the first switch based on the detection signal includes: The on / off state of the first switch is determined based on the voltage detection signal.

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