Cooking appliance

Abstract

The application provides a cooking appliance, comprising: a microwave generating circuit; a frequency converter connected with the microwave generating circuit; and an input device connected with the frequency converter and used for receiving a control parameter of the cooking appliance to control the frequency converter to drive the microwave generating circuit to operate according to the control parameter. In the technical scheme, the cooking appliance uses the frequency converter to control the microwave generating circuit to operate, the use of the frequency converter to control the operation of the microwave generating circuit can realize linear output of power, so that the energy efficiency of the cooking appliance in a unit time is higher than that in the related technical scheme controlled by a transformer, and thus the cooking appliance meets the current low-carbon and environment-friendly requirements.

Description

[0001] The present application claims priority to the Chinese patent application No. 202111667766.1, filed on December 31, 2021, with the title of "Cooking Appliance", with the State Intellectual Property Office of China, the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of cooking appliances, in particular, to a cooking appliance. BACKGROUND

[0003] In the related technical solution, the mechanical microwave oven is composed of a timer, a transformer and a microwave generator. The above-mentioned mechanical microwave oven works in a duty cycle mode, which belongs to a nonlinear working mode. The cooking performance has defects, the energy efficiency is not high, and it does not meet the current low-carbon requirements. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art or related art.

[0005] To this end, the present application provides a cooking appliance.

[0006] Therefore, the present application provides a cooking appliance, which comprises: a microwave generating circuit; a frequency converter connected with the microwave generating circuit;

[0007] An input device connected with the frequency converter is used to receive control parameters of the cooking appliance to control the frequency converter to drive the microwave generating circuit to operate according to the control parameters.

[0008] In the technical solution, the cooking appliance uses a frequency converter to control the operation of the microwave generating circuit. The use of the frequency converter to control the operation of the microwave generating circuit can realize linear output of power, so that the energy efficiency of the cooking appliance in unit time is higher than that of the related technical solution using a transformer for control, thereby making the cooking equipment meet the current low-carbon environmental protection requirements.

[0009] In the technical solution, the frequency converter can obtain the control parameters input by the user and drive the microwave generating circuit to operate according to the control parameters, because the input device is directly connected with the frequency converter.

[0010] In addition, the cooking appliance provided in the present application has the following additional technical features.

[0011] In the above technical solution, the control parameters include time parameters and / or power parameters.

[0012] In one of the technical solutions, it can be understood that the time parameter is the time length of the microwave generated by the microwave generating circuit, and the power parameter can be understood as the power of the microwave generated by the microwave generating circuit.

[0013] Specifically, for example, 1 minute is selected as the time parameter, and 700 watts is selected as the power parameter, and then the microwave generating circuit sends out 700-watt microwaves and operates for 1 minute.

[0014] In any of the above technical solutions, the cooking appliance further comprises a zero-crossing detection circuit configured to obtain a power supply frequency of the power supply signal; the frequency converter comprises a controller and a switch tube, the controller is connected with the zero-crossing detection circuit and the switch tube, and is configured to count the running time length of the frequency converter by using the power supply frequency, and in a case where the running time length of the frequency converter is greater than or equal to a preset time length, the controller controls the switch tube to be cut off to cut off the power supply of the microwave generating circuit.

[0015] In this technical solution, the cooking appliance at least comprises a frequency converter and a microwave generating circuit connected with the frequency converter, and in this technical solution, the frequency converter has a timing function, and is provided with a maximum working time, i.e., the preset time length in the present application. During the operation of the frequency converter, the running time length of the frequency converter is recorded. In a case where the running time length is not less than the preset time length, the frequency converter works according to the setting requirement of the user, i.e., drives the microwave generating circuit to work and operate. In a case where the running time length is equal to or exceeds the preset time length, the switch tube is controlled to be cut off, and in a case where the switch tube is cut off, the power supply of the microwave generating circuit is cut off, and correspondingly, the microwave generating circuit also stops operating due to power failure, so as to ensure the stable operation of the cooking appliance.

[0016] In one of the technical solutions, the cooking appliance comprises a zero-crossing detection circuit, so as to count by using the power supply frequency of the power supply signal detected by the zero-crossing detection circuit. Specifically, the time at which the power supply signal appears once per zero-crossing point can be determined according to the power supply frequency, and the running time length is determined by counting the number of times of appearing zero-crossing points.

[0017] In the above technical solution, since there is no timer in the proposed cooking appliance, the situation that the cooking appliance is stuck due to the failure of the timer does not occur during use. Therefore, when the timer is stuck, the microwave oven continues to work, which leads to the occurrence of events such as fire accidents, thereby improving the safety of the use of the cooking appliance.

[0018] In one of the technical solutions, the frequency converter is connected with the microwave generating circuit, so that the frequency converter can supply power to the microwave generating circuit to make the microwave generating circuit work after being powered on.

[0019] In any of the above technical solutions, the microwave generating circuit comprises a magnetron, wherein the magnetron generates a microwave signal after being powered on, so as to realize cooking by using the microwave signal.

[0020] In the technical solution, the frequency converter further comprises a transformer, the first end of the switch tube is configured to receive a power supply signal, the primary coil of the transformer is connected to the second end of the switch tube, the first secondary coil of the transformer is connected to the microwave generating circuit, and the controller is connected to the control end of the switch tube, and the switch tube is controlled to be turned off when the running time of the frequency converter is greater than or equal to the preset time length.

[0021] In the technical solution, the specific structure of the frequency converter is specified, wherein the frequency converter at least comprises a controller, a switch tube connected to the controller, and a transformer connected to the switch tube.

[0022] In the technical solution, the power supply control of the microwave generating circuit can be realized based on the connection relationship of the transformer, the switch tube and the microwave generating circuit, so as to supply power to the microwave generating circuit.

[0023] The switch tube is specified to realize the control of the power supply of the microwave generating circuit by controlling the on-off of the switch tube. In addition, the running time of the switch tube can be recorded by the controller, and the running time of the switch is controlled as the running time of the frequency converter, so as to cut off the power supply of the microwave generating circuit when the running time of the frequency converter is equal to or exceeds the preset time length.

[0024] In one possible embodiment, the first secondary coil has a first connection end and a second connection end, and the first connection end and the second connection end are respectively two terminal connection ends of the first secondary coil, wherein the first connection end is connected to the first input end of the microwave generating circuit, and the second connection end is connected to the second input end of the microwave generating circuit.

[0025] In one possible embodiment, the transformer is a step-up transformer.

[0026] In any of the above technical solutions, the frequency converter further comprises a fuse connected to the frequency converter and located at the input end of the frequency converter.

[0027] In the technical solution, a fuse is connected in series at the input end of the frequency converter, so as to detect the input current of the frequency converter by using the fuse. It can be understood that when the current flowing through the fuse exceeds the rated current of the fuse, the fuse will trigger the fuse to be blown, thereby cutting off the power supply to the frequency converter, so as to protect the cooking appliance when the current is abnormal during the operation of the cooking appliance, thereby improving the electrical safety of the cooking appliance.

[0028] In addition, by limiting the fuse to be located at the input end of the frequency converter, in the case that the current is abnormal during the operation of the cooking utensil and the fuse is fused, the frequency converter is separated from the part supplying power to the frequency converter, and the separated frequency converter is no longer connected with the part supplying power to the frequency converter, thereby avoiding the damage of the frequency converter caused by the connection with the part supplying power to the frequency converter in the case that the fuse is fused.

[0029] In any of the above technical solutions, the frequency converter further comprises a rectifier located between the fuse and the frequency converter.

[0030] In the technical solution, by arranging the rectifier, the power supply signal of the cooking utensil is shaped to obtain a power supply signal that can be adapted to the frequency converter, specifically, the alternating current is converted into direct current, and in this process, the cooking utensil can be adapted to various use scenarios.

[0031] In any of the above technical solutions, further comprising a voltage regulating circuit connected with the output end of the rectifier and the controller, configured to adjust the voltage value of the power supply signal to a target voltage value for the controller to be powered on and operated.

[0032] In the technical solution, by arranging the voltage regulating circuit and limiting it to be connected with the controller, the voltage regulating circuit is used to take power from the power supply circuit of the frequency converter and supply power to the controller, and in this process, the controller does not need to be separately powered, which facilitates the simplification of the power supply of the controller.

[0033] In addition, by limiting the voltage regulating circuit to be able to adjust the voltage value of the power supply signal to the target voltage value, stable power supply is provided for the controller, so as to ensure the stable operation of the controller.

[0034] In one possible embodiment, the voltage regulating circuit comprises a step-down transformer.

[0035] In any of the above technical solutions, further comprising a temperature detection device configured to obtain a temperature value of the switching tube, and the controller is further configured to: in the case that the temperature value is greater than or equal to a preset temperature value, reduce the duty cycle of the pulse width modulation signal of the switching tube or control the switching tube to be turned off.

[0036] In one possible embodiment, the duty cycle of the pulse width modulation signal of the switching tube is adjusted from a first duty cycle to a second duty cycle, wherein the first duty cycle is greater than the second duty cycle, and the first duty cycle is the duty cycle before reduction and the second duty cycle is the duty cycle after reduction. In the technical solution, by arranging the temperature detection device, the running state of the switching tube is detected by the temperature detection device, and then the switching tube is controlled when it is detected that the switching tube is running in a dangerous state, so as to reduce the probability of damage of the cooking utensil.

[0037] Specifically, in the case that the current flowing through the frequency converter is too large, the frequency converter is prone to failure. Among them, the failure of the frequency converter mainly reflects the damage of the switch tube. Considering that the current flowing through the frequency converter is too large, the current flowing through the switch tube will also be large, and in the case that the current flowing through is too large, the heat dissipation of the switch tube will increase, and the performance of the operating parameters on the switch tube is: the temperature of the switch tube. Therefore, the technical scheme of the present application sets a temperature detection device, which uses the temperature detection device to obtain the temperature value of the switch tube, and compares the temperature value with the preset temperature value, so as to determine the size of the current flowing through the switch tube according to the comparison result.

[0038] If the temperature value of the switch tube is lower than the preset temperature value, it is considered that the size of the current flowing through the switch tube is in the normal range, and when the temperature value of the switch tube is not lower than the preset temperature value, it is considered that the size of the current flowing through the switch tube is in the abnormal range. At this time, by reducing the duty cycle of the pulse width modulation signal of the switch tube, the on-time of the switch tube in unit time is reduced, and in the case that the on-time of the switch tube in unit time is reduced, the heat dissipation of the switch tube is reduced, thereby improving the reliability of the cooking utensil during operation.

[0039] In one of the possible embodiments, the preset temperature value can be set according to the specifications of the switch tube.

[0040] In any of the above technical solutions, further comprising: a relay connected with the controller and located at the input end of the frequency converter, for controlling the on-off of the power supply signal.

[0041] In this technical solution, by setting a relay, the controller can control the on-off state of the relay to realize the control of the power supply signal. In this process, in the case that the operation of the cooking utensil is abnormal, the power supply of the cooking utensil can be directly cut off, which provides a basis for protecting the components in the cooking utensil.

[0042] In one of the possible technical solutions, in the case that the running time of the frequency converter exceeds the preset time, the relay is controlled to act to cut off the power supply of the cooking utensil.

[0043] In one of the possible technical solutions, in the case that the temperature value exceeds the preset temperature value, the relay is controlled to act to cut off the power supply of the cooking utensil.

[0044] In one of the technical solutions, the rectifier has a first input end and a second input end, wherein the first input end and the second input end are connected with the zero line and the live line of the alternating current respectively.

[0045] In one of the technical solutions, the fuse is located on the zero line, and the relay is located on the live line.

[0046] In any of the above technical solutions, further comprising: a timer, connected with the frequency converter, located at the input end of the frequency converter, used for setting the working duration of the timer; wherein, in the case that the continuous working duration of the timer is greater than or equal to the working duration, the timer cuts off the power supply of the frequency converter.

[0047] In this technical solution, the timer is provided in the cooking utensil, wherein the timer has the functions of timing and switching, and the user can set the working duration through the timer according to the actual use needs, so as to control the power supply of the frequency converter according to the working duration.

[0048] In one of the technical solutions, the working duration of the timer can be replaced by the power-on duration of the frequency converter, so as to meet the control requirements of different control logics.

[0049] In any of the above technical solutions, the input device comprises: a first power supply, used for outputting an electrical signal; a voltage dividing circuit, a first end of the voltage dividing circuit being connected with the first power supply, a second end of the voltage dividing circuit being grounded, used for dividing the electrical signal, the voltage dividing circuit having a first output interface, used for being connected with a first input interface of the frequency converter; a trigger component, connected with the voltage dividing circuit, the trigger component having a plurality of trigger states, a voltage value output by the first output interface corresponding to the trigger state, wherein, when the trigger component receives a first input operation, the trigger component enters the trigger state corresponding to the first input operation, the voltage dividing circuit outputs the voltage value corresponding to the trigger state through the first output interface, and the frequency converter controls the parameter according to the voltage value output by the first output interface.

[0050] In this embodiment, the input device only uses one first output interface cooperating with the first input interface to realize the control parameter of the cooking utensil, which reduces the number of interfaces in the frequency converter compared with the control scheme in which each control parameter corresponds to one output interface, and at the same time, the assembly difficulty between the input device and the frequency converter is also reduced due to the reduction in the number of interfaces.

[0051] In this embodiment, the input device realizes the multiplexing of a single interface by using the voltage dividing circuit to output different voltage values by the first output interface under different trigger states of the trigger component. Specifically, one first power supply is provided, and the first power supply provides an electrical signal so that the voltage dividing circuit can divide the electrical signal. In the case that the first output interface on the voltage dividing circuit is fixed, the trigger state corresponding to the trigger component connected with the voltage dividing circuit will correspond to the voltage value output by the first output interface. Based on this, each trigger state can be used to represent an input control parameter, the input of the control parameter can be realized by selecting the trigger state corresponding to the control parameter, the trigger state can be identified by detecting the voltage value output by the first output interface, and then the control parameter can be obtained.

[0052] Since the input device and the frequency converter only need the first input interface to realize the input of the control parameter, the computer board can be omitted between the input device and the frequency converter, thereby reducing the manufacturing cost of the cooking utensil.

[0053] In one possible embodiment, the triggering component can be a switching device, such as an optical coupler.

[0054] In one possible embodiment, the voltage dividing circuit and the triggering component can be combined to form an integral whole, such as a slide rheostat, a potentiometer, or a device using light sensing, wireless, or other capacitance variation.

[0055] In one possible embodiment, the voltage dividing circuit includes a first resistor and N second resistors, wherein the first ends of the N second resistors are connected in series to the first power supply, the second ends of the N second resistors are connected in series to the first end of the first resistor, and the second end of the first resistor is grounded; the triggering component includes N switching devices corresponding to the N second resistors, wherein the first end of each switching device is connected to the second end of the second resistor, and the second end of each switching device is connected to the first power supply; and the first end of the first resistor is the first output interface.

[0056] In one possible embodiment, the voltage dividing circuit includes a first resistor and N second resistors, wherein the first end of the first resistor is connected to the first power supply, the second end of the first resistor is connected to the first end of the N second resistors connected in series, and the second ends of the N second resistors connected in series are grounded; the triggering component includes N switching devices corresponding to the N second resistors, wherein the first end of each switching device is connected to the first end of the second resistor, and the second end of each switching device is grounded; and the second end of the first resistor is the first output interface.

[0057] In this embodiment, the connection structure of the voltage dividing circuit is specifically limited. Based on the connection relationship between the first resistor, the N second resistors, and the N switching devices, when the switching device is turned on, one or more second circuits can be connected, and the first end of the first resistor can change when the electrical signal is constant. In the case that the corresponding relationship between the voltage value output by the first end of the first resistor and the switching device turned on in the N switching devices is pre-set, the switching device turned on in the N switching devices can be identified according to the voltage value output by the first end of the first resistor after the voltage value is detected. In this process, when the user inputs the control parameter by turning on the switching device, the input of the user can be converted into the voltage value for identification by the frequency converter.

[0058] For example, the first resistor and the second resistor are 1 ohm, N is 9, and the voltage of the electrical signal is 10 volts. If the switch corresponding to the second resistor closest to the first resistor is turned on, the voltage detected by the first input interface of the frequency converter is 1 volt.

[0059] When the fifth switch is turned on and the second output interface is used as the input device, the voltage detected by the first input interface of the frequency converter is 10 volts x the resistance of the first resistor / (the resistance of the first resistor + the sum of the resistances of the remaining four second resistors), i.e., 2 volts. Obviously, 2 volts is larger than 1 volt in the foregoing example, and thus the detection accuracy of the frequency converter is improved.

[0060] In one possible embodiment, the voltage dividing circuit further has a second output interface. The second output interface is a connection point of any two adjacent second resistors, and is used to be connected to the second input interface of the frequency converter. When the second input operation is received by the trigger assembly, the trigger assembly enters a trigger state corresponding to the second input operation. The voltage dividing circuit outputs a voltage value corresponding to the trigger state through the first output interface and the second output interface. The frequency converter determines the trigger state of the trigger assembly according to the voltage values output by the second output interface and the first output interface.

[0061] In this embodiment, a determination method with improved accuracy is defined. When the switch corresponding to the second output interface is closed, a part of the second resistors is short-circuited. In the case where the electrical signal remains unchanged, the voltage drop on each second resistor increases compared with the voltage drop before the switch corresponding to the second output interface is closed. At this time, the difference between the voltage values corresponding to different trigger states in the trigger assembly becomes larger, and thus the detection accuracy of the frequency converter is improved.

[0062] For example, the first resistor and the second resistor are 1 ohm, N is 9, and the voltage of the electrical signal is 10 volts. If the switch corresponding to the second resistor closest to the first resistor is turned on, the voltage detected by the first input interface of the frequency converter is 1 volt.

[0063] When the fifth switch is turned on and the second output interface is used as the input device, the voltage detected by the first input interface of the frequency converter is 10 volts x the resistance of the first resistor / (the resistance of the first resistor + the sum of the resistances of the remaining four second resistors), i.e., 2 volts. Obviously, 2 volts is larger than 1 volt in the foregoing example, and thus the detection accuracy of the frequency converter is improved.

[0064] In one possible embodiment, the input device further includes a third resistor between the first output interface and the first input interface, and a first capacitor. The first end of the first capacitor is connected to the first input interface, and the second end of the first capacitor is grounded.

[0065] In the embodiment, the third resistor is arranged to limit the voltage flowing into the frequency converter, so that the frequency converter is prevented from being damaged by the excessively large input voltage.

[0066] In the technical solution, the first capacitor is arranged to filter the noise input into the frequency converter, so that the influence of the noise in the frequency converter on the input control parameter is reduced.

[0067] In one of the technical solutions, the influence of the noise in the frequency converter on the input control parameter can be understood as the influence of the noise input into the frequency converter on the accuracy of the identification of the level signal.

[0068] In one of the technical solutions, the input device further comprises: a fourth resistor located between the second output interface and the second input interface; and a second capacitor, a first end of the second capacitor being connected to the second input interface, and a second end of the second capacitor being grounded.

[0069] In the embodiment, the fourth resistor is arranged to limit the voltage flowing into the frequency converter, so that the frequency converter is prevented from being damaged by the excessively large input voltage.

[0070] In the technical solution, the second capacitor is arranged to filter the noise input into the frequency converter, so that the influence of the noise in the frequency converter on the input control parameter is reduced.

[0071] In one of the technical solutions, the influence of the noise in the frequency converter on the input control parameter can be understood as the influence of the noise input into the frequency converter on the accuracy of the identification of the level signal.

[0072] In any of the above technical solutions, the input device is a key input device and / or a rotary knob input device.

[0073] In the embodiment, the form of the input device is specifically limited, wherein the rotary knob input device can be understood as adjusting the control parameter by rotating the rotary knob, and the key input device can be understood as adjusting the control parameter by pressing the key.

[0074] In one of the possible embodiments, the key input device has a plurality of keys, each key corresponding to a control parameter selection item, and when the key corresponding to the control parameter selection item is pressed, the corresponding control parameter is selected.

[0075] In any of the above technical solutions, the cooking appliance comprises a cooking cavity, and the microwave generating circuit is configured to emit a microwave signal to the cooking cavity to cook food in the cooking cavity.

[0076] In the technical solution, the cooking utensil is further provided with a cooking cavity, so that the cooking cavity is used to hold food materials, and the food materials are cooked by using the microwave signal, thereby realizing utilization of the microwave signal.

[0077] In any of the above technical solutions, the cooking utensil comprises a microwave oven or a microwave-steam-bake integrated machine.

[0078] In any of the above technical solutions, the microwave oven comprises a mechanical microwave oven.

[0079] Additional aspects and advantages of the present application will be made apparent by the following description and the appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0080] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following description, from the perspective of the drawings in which:

[0081] Figure 1 One of connection schematic diagrams of a cooking utensil in an embodiment of the present application is shown;

[0082] Figure 2 Another connection schematic diagram of a cooking utensil in an embodiment of the present application is shown;

[0083] Figure 3 One of topological schematic diagrams of an input device in an embodiment of the present application is shown;

[0084] Figure 4 Another topological schematic diagram of an input device in an embodiment of the present application is shown;

[0085] Figure 5 A third topological schematic diagram of an input device in an embodiment of the present application is shown;

[0086] Figure 6 A fourth topological schematic diagram of an input device in an embodiment of the present application is shown;

[0087] Figure 7 One of schematic diagrams of an input device in an embodiment of the present application is shown;

[0088] Figure 8 Another schematic diagram of an input device in an embodiment of the present application is shown;

[0089] Figure 9 A third schematic diagram of an input device in an embodiment of the present application is shown;

[0090] Figure 10 A fourth schematic diagram of an input device in an embodiment of the present application is shown;

[0091] Figure 11The fifth schematic diagram of the input device in an embodiment of the present invention is shown;

[0092] Figure 12 One of the connection diagrams of the cooking utensil in an embodiment of the present invention is shown.

[0093] in, Figures 1 to 6 , Figure 12 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0094] 102 Zero-crossing detection circuit, 104 Microwave generator circuit, 106 Frequency converter, 1062 Controller, 1064 Rectifier, 108 Fuse, 110 Voltage regulating circuit, 112 Relay, 114 Input device, 116 Timer, 118 Filter circuit, D Oven lamp, 120 Fan, 122 Rotating tray, Q Switching transistor, T Transformer, VCC First power supply, R1 First resistor, R2 Second resistor, R3 Third resistor, R4 Fourth resistor, K Switching device, C1 First capacitor, C2 Second capacitor. Detailed Implementation

[0095] To better understand the above aspects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0096] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0097] Example 1

[0098] like Figure 1 and Figure 2 As shown, the present invention provides a cooking appliance, including: a microwave generating circuit 104; a frequency converter 106 connected to the microwave generating circuit 104; and an input device 114 connected to the frequency converter 106 for receiving control parameters of the cooking appliance to control the frequency converter 106 to drive the microwave generating circuit 104 to operate according to the control parameters.

[0099] In this embodiment, the proposed cooking appliance uses a frequency converter 106 to control the operation of the microwave generating circuit 104. Using a frequency converter 106 to control the operation of the microwave generating circuit 104 can achieve linear power output, making the energy efficiency of the cooking appliance higher than that of the related technical solutions that use transformers for control, thereby making the cooking equipment meet the current requirements for low carbon and environmental protection.

[0100] Wherein, since the input device 114 is directly connected with the frequency converter 106, the frequency converter 106 can obtain the control parameter input by the user and drive the microwave generating circuit 104 to operate according to the control parameter.

[0101] In one embodiment, the control parameter includes a time parameter and / or a power parameter.

[0102] In one embodiment, it can be understood that the time parameter is the time length of the microwave generated by the microwave generating circuit, and the power parameter can be understood as the power of the microwave generated by the microwave generating circuit.

[0103] Specifically, for example, if the time parameter is 1 minute and the power parameter is 700 watts, the microwave generating circuit generates 700-watt microwave and operates for 1 minute.

[0104] For example, if the time parameter is 2 minutes and the power parameter is 900 watts, the microwave generating circuit 104 generates 900-watt microwave and operates for 2 minutes.

[0105] In one embodiment, the frequency converter 106 includes a switch tube Q, wherein the linear output power of the microwave generating circuit 104 is realized by controlling the conduction angle of the switch tube Q.

[0106] In one embodiment, the cooking appliance further comprises a zero-crossing detection circuit 102 for obtaining the power supply frequency of the power supply signal; the frequency converter 106 further comprises a controller 1062 connected with the zero-crossing detection circuit 102 and the switch tube Q, for timing the operation time of the frequency converter 106 using the power supply frequency, and in the case that the operation time of the frequency converter 106 is greater than or equal to the preset time length, controlling the switch tube Q to be turned off to cut off the power supply of the microwave generating circuit 104.

[0107] In this embodiment, the cooking appliance at least includes the frequency converter 106 and the microwave generating circuit 104 connected with the frequency converter 106. In this embodiment, since the frequency converter 106 has a timing function and is provided with a maximum working time, i.e. the preset time length in the present application, the frequency converter 106 records the operation time during operation, and in the case that the operation time is not less than the preset time length, the frequency converter 106 works according to the user's setting requirement, i.e. drives the microwave generating circuit 104 to work; and in the case that the operation time is equal to or exceeds the preset time length, the switch tube Q is controlled to be turned off, and the frequency converter 106 cuts off the power supply of the microwave generating circuit 104 in the case that the switch tube Q is turned off, and correspondingly, the microwave generating circuit 104 also stops running due to power failure, so as to ensure the stable operation of the cooking appliance.

[0108] In one possible embodiment, the cooking utensil is configured to include a zero-crossing detection circuit 102, so as to utilize the power supply frequency of the power supply signal detected by the zero-crossing detection circuit 102 to time, specifically, the time at which the power supply signal crosses zero point once can be determined according to the power supply frequency, and the determination of the running time can be achieved by counting the number of times of crossing zero point.

[0109] In the above embodiment, since the proposed cooking utensil does not include a timer, the situation that the cooking utensil is stuck due to the failure of the timer during use will not occur, thus avoiding the situation that the timer is stuck, and the microwave oven continues to work at this time, thus causing the occurrence of events such as fire accidents, and thus improving the safety of the cooking utensil in use.

[0110] In one embodiment, the frequency converter 106 is connected to the microwave generating circuit 104, so that the frequency converter 106 can supply power to the microwave generating circuit 104, so that the microwave generating circuit 104 is powered on and works to run the microwave generating circuit 104.

[0111] In one possible embodiment, the input device 114 is directly connected to the frequency converter 106, rather than being located on the power supply circuit structure of the frequency converter 106 and the microwave generating circuit 104,

[0112] In this case, even if the input device 114 fails, since the frequency converter 106 has the longest working time, the influence of the failure of the input device 114 on the microwave generating circuit 104 can be minimized, thus improving the reliability of the cooking utensil in operation.

[0113] In one embodiment, the input device 114 is located on the control panel of the cooking utensil.

[0114] In one possible embodiment, the microwave generating circuit 104 includes a magnetron, wherein the magnetron generates a microwave signal after being powered on, so as to utilize the microwave signal to achieve cooking.

[0115] In one possible embodiment, it further includes a voltage doubling circuit, the input end of the voltage doubling circuit is connected to the second secondary coil of the transformer T, and the output end of the voltage doubling circuit is connected to the magnetron.

[0116] In this embodiment, the voltage doubling circuit is used to increase the voltage input to the magnetron, so that the magnetron can operate in a state meeting its working requirements and generate microwaves.

[0117] In the embodiment, the voltage doubling circuit is arranged, the high voltage output by the second secondary coil is not needed, and the starting of the magnetron can be realized, meanwhile, the voltage doubling circuit is arranged, the specification requirement of the transformer T is reduced, and the manufacturing cost of the cooking utensil is reduced.

[0118] In one possible embodiment, the voltage doubling circuit comprises: a first diode; a second diode, an anode of the second diode is connected with a cathode of the first diode and a first end of the second secondary coil; a third capacitor; a fourth capacitor, a first end of the fourth capacitor is connected with a second end of the third capacitor and a second end of the second secondary coil; and a fifth resistor, a first end of the fifth resistor, an anode of the first diode and a first end of the third capacitor are connected and then connected with an input end of the magnetron, a second end of the fifth resistor, a cathode of the second diode and a second end of the fourth capacitor are connected and then grounded.

[0119] In the embodiment, the specific topology of the voltage doubling circuit is specified, wherein the voltage doubling circuit at least comprises the first diode and the second diode connected in series, the third capacitor and the fourth capacitor connected in series and the fifth resistor. After the voltage doubling circuit composed of the above-mentioned devices receives the power supply signal from the second secondary coil, a high voltage difference can be formed on the resistor, so that the input voltage value of the magnetron is increased by using the resistor.

[0120] Embodiment two

[0121] In the above-mentioned embodiment, the frequency converter 106 further comprises: a transformer T, a first end of a switch tube Q is used to receive the power supply signal; a primary coil of the transformer T is connected with a second end of the switch tube Q, a first secondary coil of the transformer T is connected with the microwave generating circuit 104; and a controller 1062 is connected with a control end of the switch tube Q, and the switch tube Q is controlled to be cut off in the case that the running time of the frequency converter 106 is greater than or equal to the preset time length.

[0122] In the embodiment, the specific structure of the frequency converter 106 is specified, wherein the frequency converter 106 at least comprises the controller 1062, the switch tube Q connected with the controller 1062 and the transformer T connected with the switch tube Q.

[0123] In the embodiment, the power supply control of the microwave generating circuit 104 can be realized based on the connection relationship of the transformer T, the switch tube Q and the microwave generating circuit 104, so as to supply power to the microwave generating circuit 104.

[0124] By limiting the existence of the switch tube Q, the power supply of the microwave generating circuit 104 is controlled by controlling the on-off of the switch tube Q. In addition, due to the existence of the controller 1062, the running time of the switch tube Q can be recorded, and the running time of the switch is controlled as the running time of the frequency converter 106, so that the power supply of the microwave generating circuit 104 is cut off when the running time of the frequency converter 106 is equal to or exceeds the preset time.

[0125] In one possible embodiment, the first secondary coil has a first connection end and a second connection end, which can be understood as two connection terminals of the first secondary coil, wherein the first connection end is connected with the first input end of the microwave generating circuit 104, and the second connection end is connected with the second input end of the microwave generating circuit 104.

[0126] In one possible embodiment, the transformer T is a step-up transformer.

[0127] In one possible embodiment, the switch tube Q is a power tube.

[0128] Embodiment three

[0129] In one possible embodiment, it further comprises a fuse 108 connected with the frequency converter 106 and located at the input end of the frequency converter 106.

[0130] In this embodiment, a fuse 108 is connected in series at the input end of the frequency converter 106, so that the fuse 108 is used to detect the input current of the frequency converter 106. It can be understood that when the current flowing through the fuse 108 exceeds the rated current of the fuse 108, the fuse 108 will trigger and fuse, thereby cutting off the power supply to the frequency converter 106, so as to protect the cooking appliance when the current is abnormal during the operation of the cooking appliance, thereby improving the electrical safety of the cooking appliance.

[0131] In addition, by limiting the fuse 108 to be located at the input end of the frequency converter 106, when the current is abnormal during the operation of the cooking appliance and the fuse 108 is fused, the frequency converter 106 is separated from the part that supplies power to the frequency converter 106, and the separated frequency converter 106 is no longer connected with the part that supplies power to the frequency converter 106, thereby avoiding the damage of the frequency converter 106 caused by the connection with the part that supplies power to the frequency converter 106 after the fuse 108 is fused.

[0132] Embodiment four

[0133] In one possible embodiment, the frequency converter 106 further comprises a rectifier 1064 located between the fuse 108 and the frequency converter 106. In one possible embodiment, the frequency converter 106 further comprises a rectifier 1064 located between the fuse 108 and the frequency converter 106.

[0134] In this embodiment, the rectifier 1064 is configured to shape the power supply signal of the cooking utensil, so as to obtain a power supply signal that can be adapted to the frequency converter 106, specifically, to convert the alternating current into direct current, in the process, the cooking utensil can be adapted to multiple use scenarios.

[0135] Embodiment five

[0136] In one possible embodiment, further comprising: a voltage regulating circuit 110, connected to the output of the rectifier 1064 and the controller 1062, for adjusting the voltage value of the power supply signal to a target voltage value, for the controller 1062 to operate normally.

[0137] In this embodiment, the voltage regulating circuit 110 is configured to take power from the power supply circuit of the frequency converter 106 and supply power to the controller 1062, in the process, the controller 1062 does not need to be separately powered, which facilitates the simplification of the power supply of the controller 1062.

[0138] In addition, the voltage regulating circuit 110 is configured to adjust the voltage value of the power supply signal to the target voltage value, so as to provide stable power supply for the controller 1062, so as to ensure the stable operation of the controller 1062.

[0139] In one possible embodiment, the voltage regulating circuit 110 includes a step-down transformer.

[0140] In one possible embodiment, the target voltage value can be 3 volts, 5 volts, 12 volts, 36 volts, etc. The specific value can be determined according to the selection of the controller 1062.

[0141] In one possible embodiment, the target voltage value includes a first target voltage value and a second target voltage value, wherein the first target voltage value is used to supply power to the controller 1062, and the second target voltage value is used to supply power to the relay 112.

[0142] Embodiment six

[0143] In one possible embodiment, further comprising: a temperature detection device for obtaining a temperature value of the switch tube Q, and the controller 1062 is further configured to: in the case that the temperature value is greater than or equal to a preset temperature value, reduce the duty cycle of the pulse width modulation signal of the switch tube Q or control the switch tube Q to be turned off.

[0144] In one possible embodiment, the duty cycle of the pulse width modulation signal of the switch tube Q is adjusted from a first duty cycle to a second duty cycle, wherein the first duty cycle is greater than the second duty cycle, and the first duty cycle is the duty cycle before reduction, and the second duty cycle is the duty cycle after reduction.

[0145] In this embodiment, by setting a temperature detection device, the running state of the switch tube Q is detected by the temperature detection device, and when it is detected that the switch tube Q is running in a dangerous state, the switch tube Q is controlled to reduce the probability of damage of the cooking utensil.

[0146] Specifically, in the case that the current flowing through the frequency converter 106 is too large, the frequency converter 106 is prone to failure. Among them, the failure of the frequency converter 106 mainly reflects the damage of the switch tube Q. Considering that when the current flowing through the frequency converter 106 is too large, the current flowing through the switch tube Q will also be large, and in the case that the current flowing through is too large, the heat generation of the switch tube Q will increase, and the performance of the running parameter on the switch tube Q is: the temperature of the switch tube Q. Therefore, an embodiment of the present application sets a temperature detection device, which obtains the temperature value of the switch tube Q by using the temperature detection device, and compares the temperature value with a preset temperature value, so as to determine the size of the current flowing through the switch tube Q according to the comparison result.

[0147] If the temperature value of the switch tube Q is lower than the preset temperature value, it is considered that the size of the current flowing through the switch tube Q is in a normal range, and if the temperature value of the switch tube Q is not lower than the preset temperature value, it is considered that the size of the current flowing through the switch tube Q is in an abnormal range. At this time, by reducing the duty cycle of the pulse width modulation signal of the switch tube Q, the conduction time of the switch tube Q per unit time is reduced, and in the case that the conduction time of the switch tube Q per unit time is reduced, the heat generation of the switch tube Q is reduced, thereby improving the reliability of the cooking utensil during operation.

[0148] In one possible embodiment, the preset temperature value can be set according to the specifications of the switch tube Q.

[0149] In one possible embodiment, the temperature detection device is located on the switch tube Q or within a preset range of the switch tube Q, wherein the preset range can be selected according to the actual use scene.

[0150] Embodiment Seven

[0151] In one possible embodiment, it further includes a relay 112 connected with the frequency converter 106 controller 1062, located at the input end of the frequency converter 106, used for controlling the on-off of the power supply signal.

[0152] In this embodiment, by setting a relay 112, the controller 1062 can control the power supply signal by controlling the conduction state of the relay 112, and in this process, in the case that the cooking utensil operation is abnormal, the power supply of the cooking utensil can be directly cut off, which provides a basis for protecting the components in the cooking utensil.

[0153] In one possible embodiment, the control relay 112 is controlled to cut off the power supply of the cooking appliance when the running time of the frequency converter 106 exceeds a preset time length.

[0154] In one possible embodiment, the control relay 112 is controlled to cut off the power supply of the cooking appliance when the temperature value exceeds a preset temperature value.

[0155] In one embodiment, the rectifier 1064 has a first input end and a second input end, wherein the first input end and the second input end are connected to the zero line and the live line of the alternating current respectively.

[0156] In one embodiment, the fuse 108 is located on the zero line, and the relay 112 is located on the live line.

[0157] In one embodiment, the relay 112 is connected to the voltage regulating circuit 110 and is powered on under the power supply of the voltage regulating circuit 110.

[0158] Specifically, the relay 112 is powered on under the power supply of the voltage regulating circuit 110, and the control of the opening and closing of the relay 112 is realized under the control of the controller 1062.

[0159] In one possible embodiment, the second duty cycle is equal to zero, i.e., the control switch tube Q is turned off to control the microwave generating circuit 104 to stop running.

[0160] Embodiment Eight

[0161] In one possible embodiment, as shown in FIG. 8, the cooking appliance further comprises a timer 116 connected to the frequency converter 106 and located at the input end of the frequency converter 106, for setting the working time length of the timer. Figure 12

[0162] In this embodiment, the cooking appliance is provided with the timer 116, wherein the timer 116 has the functions of timing and switching, and the user can set the working time length through the timer 116 according to the actual use needs, so as to control the power supply of the frequency converter 106 according to the working time length.

[0163] In one technical solution, the working time length of the timer 116 can be replaced by the power-on time length of the frequency converter 106 to meet the control needs of different control logics.

[0164] In one embodiment, the timer 116 can be used to set the cooking time length, and the input device 114 can be used to control the cooking power.

[0165] Embodiment Nine​

[0166] In one possible implementation, as shown in Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , the input device 114 includes a first power supply VCC for outputting an electrical signal, a voltage dividing circuit having a first end connected to the first power supply VCC and a second end grounded for dividing the electrical signal, the voltage dividing circuit having a first output interface for connecting with the first input interface of the frequency converter 106, and a triggering component connected to the voltage dividing circuit, the triggering component having a plurality of triggering states, the voltage value outputted by the first output interface corresponding to the triggering state, wherein when the triggering component receives a first input operation, the triggering component enters the triggering state corresponding to the first input operation, the voltage dividing circuit outputs the voltage value corresponding to the triggering state through the first output interface, and the frequency converter 106 determines the control parameter according to the voltage value outputted by the first output interface.

[0167] In this implementation, the input device 114 only uses one first output interface cooperating with the first input interface to realize the control parameter of the cooking appliance, which reduces the number of interfaces in the frequency converter 106 relative to the control scheme in which one output interface corresponds to one control parameter, and also reduces the assembly difficulty between the input device 114 and the frequency converter 106 due to the reduced number of interfaces.

[0168] Specifically, one first power supply VCC is provided to provide an electrical signal for the voltage dividing circuit to divide, and in the case that the first output interface on the voltage dividing circuit is fixed, the triggering state corresponding to the triggering component connected to the voltage dividing circuit corresponds to the voltage value outputted by the first output interface. Based on this, each triggering state can be used to represent an input control parameter, the input of the control parameter can be realized by selecting the triggering state corresponding to the control parameter, the triggering state can be identified by detecting the voltage value outputted by the first output interface, and then the control parameter can be obtained.

[0169] Since the input device 114 and the frequency converter 106 only need the first input interface to realize the input of the control parameter, a computer board can not be arranged between the input device 114 and the frequency converter 106, thereby reducing the manufacturing cost of the cooking appliance.

[0170] In one possible implementation, the triggering component can be a switching device, such as an optical coupler.

[0171] In one possible embodiment, the voltage dividing circuit and the triggering component can be combined and form an integral, such as a slide rheostat, a potentiometer, and can also be a device using light sensing, wireless, and other ways of changing the capacitance value.

[0172] In one possible embodiment, the voltage dividing circuit includes a first resistor R1 and N second resistors R2, wherein the first end of the N second resistors R2 connected in series is connected to the first power supply VCC, the second end of the N second resistors R2 connected in series is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is grounded; the triggering component includes N switching devices K corresponding to the N second resistors R2, wherein the first end of each switching device K is connected to the second end of the second resistor R2, and the second end of each switching device K is connected to the first power supply VCC; and the first end of the first resistor R1 is the first output interface.

[0173] In one possible embodiment, the voltage dividing circuit includes a first resistor R1 and N second resistors R2, wherein the first end of the first resistor R1 is connected to the first power supply VCC, the second end of the first resistor R1 is connected to the first end of the N second resistors R2 connected in series, and the second end of the N second resistors R2 connected in series is grounded; the triggering component includes N switching devices K corresponding to the N second resistors R2, wherein the first end of each switching device K is connected to the first end of the second resistor R2, and the second end of each switching device K is grounded; and the second end of the first resistor R1 is the first output interface.

[0174] In this embodiment, the connection structure of the voltage dividing circuit is specifically limited. Based on the connection relationship between the first resistor R1, the N second resistors R2, and the N switching devices K, when the switching device K is turned on, one or more second circuits can be turned on, and the first end of the first resistor R1 changes under the condition that the electrical signal remains unchanged. In the case where the corresponding relationship between the voltage value output by the first end of the first resistor R1 and each of the N switching devices K being turned on is pre-set, after detecting the voltage value, the switching device K being turned on among the N switching devices K can be identified according to the voltage value output by the first end of the first resistor R1. In this process, when the user enters the control parameter by turning on the switching device K, the input of the user can be converted into a voltage value for identification by the frequency converter 106.

[0175] For example, the first resistor R1 and the second resistor R2 have a resistance of 1 ohm, N is 9, and the voltage of the electrical signal is 10 volts. If the switching device K corresponding to the second resistor R2 closest to the first resistor R1 is turned on, the voltage value detected by the first input interface of the frequency converter 106 is 1 volt.

[0176] When the fifth switch K is turned on, five second resistors R2 are short-circuited, and the voltage value detected by the first input interface of the frequency converter 106 is 10 volts*the resistance value of the first resistor R1 / (the resistance value of the first resistor R1+the sum of the resistance values of the remaining four second resistors R2), i.e., 2 volts. Obviously, when the voltage value of 2 volts is detected, it can be directly determined that the fifth switch K is turned on.

[0177] In one possible embodiment, the voltage dividing circuit further has a second output interface, wherein the second output interface is the connection point of any two adjacent second resistors R2, and is used to be connected with the second input interface of the frequency converter 106. When the second input operation is received by the trigger assembly, the trigger assembly enters a trigger state corresponding to the second input operation. The voltage dividing circuit outputs a voltage value corresponding to the trigger state through the first output interface and the second output interface. The frequency converter 106 determines the trigger state of the trigger assembly according to the voltage values output by the second output interface and the first output interface.

[0178] In this embodiment, a determination method with improved accuracy is defined. Specifically, when the switch K corresponding to the second output interface is closed, a part of the second resistors R2 is short-circuited. In the case that the electrical signal does not change, the voltage drop on each second resistor R2 will increase compared with the voltage drop before the switch K corresponding to the second output interface is closed. At this time, the difference between the voltage values corresponding to different trigger states in the trigger assembly will become larger, and thus the detection accuracy of the frequency converter 106 can be improved.

[0179] For example, the resistance values of the first resistor R1 and the second resistor R2 are 1 ohm, N is 9, and the voltage of the electrical signal is 10 volts. If the switch K corresponding to the second resistor R2 closest to the first resistor R1 is turned on, the voltage value detected by the first input interface of the frequency converter 106 is 1 volt.

[0180] If the fifth switch K is turned on and serves as the second output interface of the input device 114, because the fifth switch K is turned on, five second resistors R2 are short-circuited, and the voltage value detected by the first input interface of the frequency converter 106 is 10 volts*the resistance value of the first resistor R1 / (the resistance value of the first resistor R1+the sum of the resistance values of the remaining four second resistors R2), i.e., 2 volts. Obviously, 2 volts is larger than 1 volt in the foregoing, and thus the detection accuracy of the frequency converter 106 is improved.

[0181] In one possible embodiment, the input device 114 further includes a third resistor R3 located between the first output interface and the first input interface, and a first capacitor C1, wherein a first end of the first capacitor C1 is connected with the first input interface, and a second end of the first capacitor C1 is grounded.

[0182] In this embodiment, the third resistor R3 is arranged to limit the voltage flowing into the frequency converter 106, so as to avoid damage of the frequency converter 106 due to excessive input voltage.

[0183] In this possible embodiment, the first capacitor C1 is arranged to filter the noise input into the frequency converter 106, so as to reduce the influence of the noise in the frequency converter 106 on the input control parameter.

[0184] In one possible embodiment, the influence of the noise in the frequency converter 106 on the input control parameter can be understood as the influence of the noise input into the frequency converter 106 on the accuracy of the identification of the level signal.

[0185] In one possible embodiment, the input device 114 further comprises: a fourth resistor R4, located between the second output interface and the second input interface; and a second capacitor C2, a first end of the second capacitor C2 being connected to the second input interface, and a second end of the second capacitor C2 being grounded.

[0186] In this embodiment, the fourth resistor R4 is arranged to limit the voltage flowing into the frequency converter 106, so as to avoid damage of the frequency converter 106 due to excessive input voltage.

[0187] In this possible embodiment, the second capacitor C2 is arranged to filter the noise input into the frequency converter 106, so as to reduce the influence of the noise in the frequency converter 106 on the input control parameter.

[0188] In one possible embodiment, the influence of the noise in the frequency converter 106 on the input control parameter can be understood as the influence of the noise input into the frequency converter 106 on the accuracy of the identification of the level signal.

[0189] In one possible embodiment, the power parameter can be divided into different gears, such as low fire, thawing, medium fire, medium-high fire and high fire, wherein each gear corresponds to a power value, and the power values corresponding to the low fire, thawing, medium fire, medium-high fire and high fire increase in turn.

[0190] In one possible embodiment, the time parameter can be selected within a preset time interval, such as 10 seconds to 35 minutes.

[0191] In one possible embodiment, the switch device K can be in the form of a knob or a button.

[0192] In one possible embodiment, one or more resistors of the N second resistors have the same resistance value, or different resistance values.

[0193] In one possible implementation, the resistance of all the second resistors is the same.

[0194] In one possible implementation, for the sake of distinction, the first resistor R1 is denoted as R0, the N second resistors R2 are denoted as a first resistor R01, a second resistor R02, a third resistor R03, …, and an n-th resistor R0n, respectively, and the N switch devices K are denoted as a first switch device K1, a second switch device K2, …, and an n-1-th switch device Kn-1, respectively. For example, when the first switch device K1 is turned on, the level signal is V I / 0 = VCC x R0 / (R02+…+R0n).

[0195] In one possible implementation, the input device 114 can further have a display interface for interacting with the user, so as to improve the user's interactive experience.

[0196] In one possible implementation, the display interface is used to display at least one of the current input time parameter and the power parameter.

[0197] In addition, since the input device 114 can be applied to a smaller number of data interfaces to realize the input of the time parameter and the power parameter, that is, the input of the two parameters is realized by the same device, that is, the input of the power parameter can be realized by the input device 114 of the time parameter, or the input of the time parameter can be realized by the input device 114 of the power parameter, the reuse of the existing input device 114 is realized, so that the manufacturing cost of the cooking utensil is reduced, and the space occupation of the input device 114 in the cooking utensil is reduced, facilitating the miniaturization of the cooking utensil.

[0198] In one possible implementation, as shown in Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 , the input device 114 is a key input device 114 and / or a rotary knob input device 114.

[0199] In this embodiment, the form of the input device 114 that can be selected is specifically limited, wherein the rotary knob input device 114 can be understood as adjusting the control parameter by rotating the rotary knob, and the key input device 114 can be understood as adjusting the control parameter by pressing the key.

[0200] Specifically, the input device 114 is essentially a control switch, and the key-type input device 114 and / or the knob-type input device 114 can be understood as realizing input according to different operation modes, which can be key-type, knob-type, combined-type or multiplexed-type, wherein the combined-type or multiplexed-type is power-time multiplexed adjustment.

[0201] In one possible embodiment, the key-type input device 114 has a plurality of keys, each of which corresponds to a control parameter selection item, and when the key corresponding to the control parameter selection item is pressed, the corresponding control parameter is selected.

[0202] In one possible embodiment, the single-knob input device 114 is used to realize the input of one or both of the time parameter and the power parameter, specifically, when starting from the default position and rotating in the clockwise direction, the time parameter is input, and when starting from the default position and rotating in the counterclockwise direction, the power parameter is input.

[0203] In one possible embodiment, when the single-knob input device 114 is used to realize the input of one or both of the time parameter and the power parameter, if it is detected that the knob starts to rotate from the default position, the input performed within a set time period is the adjustment of the parameter determined by starting to rotate from the default position. For example, when starting from the default position and rotating in the clockwise direction, the input within the set time period is the input of the time parameter; similarly, when starting from the default position and rotating in the counterclockwise direction, the input within the set time period is the input of the power parameter, so as to realize the multiplexing of the single-knob input device 114.

[0204] In one possible embodiment, the default position is the position where the pointer in the single-knob input device 114 indicates zero.

[0205] In one possible embodiment, as shown in Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 , each key corresponds to a switch device K, and when the key is pressed, the corresponding switch device K is turned on.

[0206] Embodiment Ten

[0207] In one possible embodiment, the cooking appliance comprises a cooking cavity, and the microwave generating circuit 104 is configured to emit a microwave signal to the cooking cavity to cook food materials located in the cooking cavity.

[0208] In this embodiment, by limiting that the cooking appliance further has a cooking cavity, the cooking cavity is used to hold food materials, and the microwave signal is used to cook the food materials, so as to realize the utilization of the microwave signal.

[0209] In one possible embodiment, the cooking appliance comprises a microwave oven or a microwave-steam-bake all-in-one machine.

[0210] In this embodiment, the cooking appliance comprises, but is not limited to, the microwave oven or the microwave-steam-bake all-in-one machine as mentioned above, which can be the cooking appliance with the above-mentioned frequency converter 106 and the microwave generating circuit 104.

[0211] In this embodiment, in the case where the cooking appliance is the microwave-steam-bake all-in-one machine, the cooking appliance further has a steam generating device and a baking device, wherein the steam generating device is used to output steam into a cooking cavity in the cooking appliance so as to cook food materials located in the cooking cavity by using the output steam, and the baking device can be a heating tube or a hot air heating device, wherein the heating tube is located at the top of the cooking cavity, and the hot air heating device is located at the back of the cooking cavity.

[0212] In one possible embodiment, the microwave oven can be a flat plate type microwave oven.

[0213] In one possible embodiment, the microwave oven comprises a mechanical microwave oven.

[0214] As shown in FIG. 1, in one embodiment, the microwave oven further comprises a filter circuit 118 connected with the power connection, which is used to filter out interference signals in the power supply signal, wherein the fuse 108 is arranged in the filter circuit 118, which is used to limit the current size of the power supply signal, so as to reduce the possibility of damage of the microwave oven due to overcurrent. Figure 12

[0215] In one embodiment, the microwave oven further comprises a lamp D and a fan 120, wherein the lamp D is used to provide illumination for the cooking cavity, and the fan 120 is used to accelerate the heat transfer between the microwave oven and the environment, so as to achieve the effect of ventilation and heat dissipation.

[0216] In the case where the microwave oven is a mechanical microwave oven, the microwave oven further comprises a motor and a rotating tray 122, wherein the food materials are located on the rotating tray 122, and the motor is connected with the rotating tray 122, which is used to drive the rotating tray 122 to rotate, so that the rotating tray can rotate simultaneously in the case where the magnetron outputs the microwave signal, thereby ensuring that the food materials can be uniformly heated, and avoiding the occurrence of the situation that the local position of the food materials is scorched.

[0217] ​In the description of the application, the term "a plurality" means two or more, unless otherwise expressly specified, and the terms "upper", "lower", and the like, indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application; the terms "connection", "installation", "fixation" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integral connection; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0218] In the description of the application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like are intended to mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0219] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cooking utensil, characterized in that, include: Microwave generating circuit; The frequency converter is connected to the microwave generating circuit; An input device, connected to the frequency converter, is used to receive control parameters of the cooking appliance, so as to control the frequency converter to drive the microwave generating circuit to operate according to the control parameters; Zero-crossing detection circuit is used to obtain the power supply frequency of the power supply signal; The frequency converter includes a controller and a switching transistor. The controller is connected to the zero-crossing detection circuit and the switching transistor, and is used to time the running time of the frequency converter using the power supply frequency. When the running time of the frequency converter is greater than or equal to a preset time, the controller controls the switching transistor to turn off and cuts off the power supply to the microwave generating circuit.

2. The cooking utensil according to claim 1, characterized in that, The control parameters include time parameters and / or power parameters.

3. The cooking utensil according to claim 1, characterized in that, The frequency converter also includes: The transformer, wherein the first terminal of the switching transistor is used to receive the power supply signal; The primary coil of the transformer is connected to the second terminal of the switching transistor, and the primary coil of the transformer is connected to the microwave generating circuit. The controller is connected to the control terminal of the switching transistor, and controls the switching transistor to turn off when the operating time of the frequency converter is greater than or equal to a preset time.

4. The cooking utensil according to claim 3, characterized in that, Also includes: A fuse, connected to the frequency converter, is located at the input terminal of the frequency converter.

5. The cooking utensil according to claim 4, characterized in that, The frequency converter also includes: A rectifier is located between the fuse and the frequency converter.

6. The cooking utensil according to claim 5, characterized in that, Also includes: A voltage regulation circuit, connected to the output terminal of the rectifier and the controller, is used to adjust the voltage value of the power supply signal to the target voltage value so that the controller can be powered on and operated.

7. The cooking utensil according to claim 3, characterized in that, Also includes: A temperature detection device is used to acquire the temperature value of the switching transistor, and the controller is further used to: If the temperature value is greater than or equal to the preset temperature value, reduce the duty cycle of the pulse width modulation signal of the switching transistor or control the switching transistor to turn off.

8. The cooking utensil according to claim 4, characterized in that, Also includes: A relay, connected to the controller and located at the input terminal of the frequency converter, is used to control the on / off state of the power supply signal.

9. The cooking utensil according to any one of claims 1 to 6, characterized in that, Also includes: A timer, connected to the frequency converter and located at the input terminal of the frequency converter, is used to set the operating duration of the timer; Wherein, if the continuous working duration of the timer is greater than or equal to the working duration, the timer cuts off the power supply to the frequency converter.

10. The cooking utensil according to any one of claims 1 to 6, characterized in that, The input device includes: The first power source is used to output electrical signals; A voltage divider circuit, wherein the first terminal of the voltage divider circuit is connected to the first power supply, the second terminal of the voltage divider circuit is grounded, and the voltage divider circuit is used to divide the voltage of the electrical signal. The voltage divider circuit has a first output interface for connecting to the first input interface of the frequency converter. A trigger component, connected to the voltage divider circuit, has multiple trigger states, and the voltage value output by the first output interface corresponds to each trigger state. When the triggering component receives the first input operation, the triggering component enters the triggering state corresponding to the first input operation. The voltage divider circuit outputs the voltage value corresponding to the triggering state through the first output interface. The frequency converter determines the control parameters based on the voltage value output by the first output interface.

11. The cooking utensil according to claim 10, characterized in that, The voltage divider circuit includes: First resistor; N second resistors, wherein the first end of the N second resistors connected in series is connected to the first power supply, the second end of the N second resistors connected in series is connected to the first end of the first resistor, and the second end of the first resistor is grounded; The triggering component includes: There are N switching devices, and each of the N switching devices corresponds to one of the N second resistors. Wherein, the first end of each of the switching devices is connected to the second end of the second resistor, and the second end of each of the switching devices is connected to the first power supply; The first end of the first resistor is the first output interface.

12. The cooking utensil according to claim 10, characterized in that, The voltage divider circuit includes: First resistor; N second resistors, wherein the first end of the first resistor is connected to the first power supply, the second end of the first resistor is connected to the first end of the N second resistors connected in series, and the second end of the N second resistors connected in series is grounded; The triggering component includes: There are N switching devices, and each of the N switching devices corresponds to one of the N second resistors. Wherein, the first terminal of each of the switching devices is connected to the first terminal of the second resistor, and the second terminal of each of the switching devices is grounded; The second end of the first resistor is the first output interface.

13. The cooking utensil according to claim 11 or 12, characterized in that, The voltage divider circuit also has a second output interface, wherein the second output interface is the connection point of any two adjacent second resistors, and is used to connect to the second input interface of the frequency converter. When the trigger component receives the second input operation, the trigger component enters the trigger state corresponding to the second input operation. The voltage divider circuit outputs a voltage value corresponding to the trigger state through the first output interface and the second output interface. The frequency converter determines the trigger state of the trigger component based on the voltage value output by the second output interface and the first output interface.

14. The cooking utensil according to claim 11 or 12, characterized in that, The input device further includes: The third resistor is located between the first output interface and the first input interface; A first capacitor, the first end of which is connected to the first input interface, and the second end of which is grounded.

15. The cooking utensil according to claim 13, characterized in that, The input device further includes: The fourth resistor is located between the second output interface and the second input interface; The second capacitor has its first terminal connected to the second input interface and its second terminal grounded.

16. The cooking utensil according to any one of claims 1 to 6, characterized in that, The input device is a keypad input device and / or a rotary input device.

17. The cooking utensil according to any one of claims 1 to 6, characterized in that, The cooking appliance includes: The cooking cavity is equipped with a microwave generating circuit that transmits microwave signals to the cooking cavity to cook the food located in the cooking cavity.

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