CN116419443A - Cooking utensil - Google Patents

Abstract

The present invention provides a cooking appliance, comprising: a microwave generating circuit; the frequency converter is connected with the microwave generating circuit; the input device is connected with the frequency converter and used for receiving control parameters of the cooking utensil so as to control the frequency converter to drive the microwave generating circuit to operate according to the control parameters. In the technical scheme, the frequency converter is adopted to control the operation of the microwave generating circuit, and the frequency converter is used to control the operation of the microwave generating circuit to realize the linear output of power, so that the energy efficiency of the cooking appliance in unit time is higher than that of the cooking appliance controlled by the transformer in the related technical scheme, and the cooking equipment meets the current low-carbon environment-friendly requirement.

Description

Cooking utensil

The present application claims priority from the chinese patent application filed at 12 months 31 of 2021, to the chinese national intellectual property agency, application number "202111667766.1", application name "cooking appliance", the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a cooking appliance.

Background

In the related technical scheme, the mechanical microwave oven consists of a timer, a transformer and a microwave generator, wherein the mechanical microwave oven works in a duty ratio mode, the duty ratio mode belongs to a nonlinear working mode, the cooking performance has defects, the energy efficiency is low, and the current low-carbon requirement is not met.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

To this end, the present invention is to provide a cooking appliance.

In view of the above, the present invention provides a cooking appliance including: a microwave generating circuit; the frequency converter is connected with the microwave generating circuit;

the input device is connected with the frequency converter and used for receiving control parameters of the cooking utensil so as to control the frequency converter to drive the microwave generating circuit to operate according to the control parameters.

In the technical scheme, the frequency converter is adopted to control the operation of the microwave generating circuit, and the frequency converter is used to control the operation of the microwave generating circuit to realize the linear output of power, so that the energy efficiency of the cooking appliance in unit time is higher than that of the cooking appliance controlled by the transformer in the related technical scheme, and the cooking equipment meets the current low-carbon environment-friendly requirement.

The input device is directly connected with the frequency converter, so that the frequency converter can acquire control parameters recorded by a user and drive the microwave generating circuit to operate according to the control parameters.

In addition, the cooking appliance provided by the application has the following additional technical characteristics.

In the above technical solution, the control parameters include a time parameter and/or a power parameter.

In one of the technical solutions, it is understood that the time parameter, i.e. the duration of the microwave emitted by the microwave generating circuit, and the power parameter, it is understood that the microwave generating circuit emits the power of the microwave.

Specifically, for example, when 1 minute is selected on the time parameter and 700 watts is selected on the power parameter, the microwave generating circuit emits 700 watts of microwaves and operates for 1 minute.

In any of the above technical solutions, the cooking appliance further includes: the zero-crossing detection circuit is used for acquiring the power supply frequency of the power supply signal; the frequency converter comprises a controller and a switching tube, wherein the controller is connected with the zero-crossing detection circuit and the switching tube and is used for timing the operation time length of the frequency converter by using the power supply frequency, and the switching tube is controlled to cut off under the condition that the operation time length of the frequency converter is longer than or equal to the preset time length, so that the power supply of the microwave generating circuit is cut off.

In the technical scheme, the cooking appliance at least comprises a frequency converter and a microwave generating circuit connected with the frequency converter, and in the technical scheme, the frequency converter has a timing function and is provided with the longest working time, namely the preset duration in the application, the working duration of the frequency converter can be recorded in the working process of the frequency converter, and the frequency converter can work according to the set requirements of a user under the condition that the working duration is not lower than the preset duration, namely the microwave generating circuit is driven to work and operate; and when the operation time length is equal to or exceeds the preset time length, the switching tube is controlled to be cut off, and when the switching tube is cut off, the power supply of the microwave generating circuit is cut off, and correspondingly, the microwave generating circuit is stopped to operate due to power failure, so that the stable operation of the cooking utensil is ensured.

In one of the technical schemes, the cooking appliance is limited to comprise a zero-crossing detection circuit so as to time by using the power supply frequency of the power supply signal detected by the zero-crossing detection circuit, specifically, the time of each zero-crossing point of the power supply signal can be determined according to the power supply frequency, and the determination of the operation duration can be realized by counting the number of times of zero-crossing points.

In the technical scheme, as the timer is not arranged in the proposed cooking utensil, the situation that the cooking utensil is blocked due to the failure of the timer can not occur in the using process, so that the situation that the timer is blocked is avoided, and the microwave oven continuously works at the moment, so that the occurrence of events such as fire accidents is caused, and the using safety of the cooking utensil is improved.

In one of the technical schemes, the frequency converter is connected with the microwave generating circuit, so that the frequency converter can supply power to the microwave generating circuit, and the microwave generating circuit can work and operate after being electrified.

In any of the above aspects, the microwave generating circuit includes: and the magnetron generates a microwave signal after being electrified so as to realize cooking by using the microwave signal.

In the above technical solution, the frequency converter further includes: the first end of the switching tube is used for receiving a power supply signal; the primary coil of the transformer is connected with the second end of the switch tube, and the first secondary coil of the transformer is connected with the microwave generating circuit; the controller is connected with the control end of the switching tube, and the switching tube is controlled to be cut off under the condition that the running time length of the frequency converter is longer than or equal to the preset time length.

In the technical scheme, a specific structure of the frequency converter is specifically defined, wherein the frequency converter at least comprises a controller, a switching tube connected with the controller and a transformer connected with the switching tube.

In the technical scheme, the power supply control of the microwave generating circuit can be realized based on the connection relation of the transformer, the switching tube and the microwave generating circuit so as to supply power to the microwave generating circuit.

The control of the power supply of the microwave generating circuit is realized by controlling the on-off of the switching tube by limiting the existence of the switching tube. In addition, due to the existence of the controller, the operation time of the switch tube can be recorded, and the operation time of the switch is used as the operation time of the frequency converter to be controlled, so that the power supply of the microwave generating circuit is cut off under the condition that the operation time of the frequency converter is equal to or exceeds the preset time.

In one possible embodiment, the first secondary coil has a first connection and a second connection, it being understood that the first connection and the second connection are two connection terminals of the first secondary coil, respectively, wherein the first connection is connected to a first input of the microwave generating circuit and the second connection is connected to a second input of the microwave generating circuit.

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

In any of the above technical solutions, the method further includes: and the fuse is connected with the frequency converter and is positioned at the input end of the frequency converter.

In the technical scheme, a fuse is connected in series at the input end of the frequency converter, so that the fuse is used for detecting the input current of the frequency converter. It can be known that under the condition that the current flowing through the fuse exceeds the rated current of the fuse, the fuse can trigger to be fused, so that the power supply to the frequency converter is cut off, and the protection of the cooking appliance is realized under the condition that the current abnormality occurs when the cooking appliance operates, and in the process, the electricity safety of the cooking appliance is improved.

In addition, the fuse is limited to be positioned at the input end of the frequency converter, so that the frequency converter is separated from a part for supplying power to the frequency converter under the condition that current abnormality occurs when the cooking utensil is in operation and the fuse is fused, the separated frequency converter is not connected with the part for supplying power to the frequency converter, and damage to the frequency converter due to the connection with the part for supplying power to the frequency converter under the condition that the fuse is fused is avoided.

In any of the above solutions, the frequency converter further includes: and the rectifier is positioned between the fuse and the frequency converter.

In the technical scheme, the rectifier is arranged so as to shape the power supply signal of the cooking appliance, so that the power supply signal which can be matched with the frequency converter is obtained, specifically, the alternating current is converted into the direct current, and in the process, the cooking appliance can be matched with various use scenes.

In any of the above technical solutions, the method further includes: and the voltage regulating circuit is connected with the output end of the rectifier and the controller and is used for regulating the voltage value of the power supply signal to a target voltage value so as to enable the controller to be electrified and run.

In the technical scheme, the voltage regulating circuit is arranged and is limited to be connected with the controller, so that the voltage regulating circuit is used for taking electricity from the power supply loop of the frequency converter and supplying power to the controller, and in the process, the controller does not need to be independently provided with power supply, so that the power supply of the controller is facilitated to be simplified.

In addition, the voltage value of the power supply signal can be adjusted to a target voltage value by limiting the voltage regulating circuit so as to provide stable power supply for the controller, so that stable operation of the controller is ensured.

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

In any of the above technical solutions, the method further includes: the temperature detection device is used for acquiring the temperature value of the switching tube, and the controller is also used for: and under the condition that the temperature value is larger than or equal to a preset temperature value, reducing the duty ratio of the pulse width modulation signal of the switching tube or controlling the switching tube to cut off.

In one possible embodiment, the duty cycle of the pwm 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, wherein the first duty cycle is the duty cycle before the decrease and the second duty cycle is the duty cycle after the decrease. In this technical scheme, through setting up temperature-detecting device to utilize temperature-detecting device to detect the running state of switch tube, and then detect the switch tube and move under dangerous state, control the switch tube, so that reduce the probability that cooking utensil appears damaging.

In particular, in the case of an excessive current flowing through the frequency converter, the frequency converter is extremely prone to failure. The frequency converter is mainly in fault, the damage of the switching tube is mainly caused, when the current flowing through the frequency converter is too large, the current flowing through the switching tube is also increased, and under the condition that the current flowing through the frequency converter is too large, the heating value of the switching tube is increased, and the operation parameters on the switching tube are as follows: the temperature of the switching tube. Therefore, the technical scheme of the application is that a temperature detection device is arranged, the temperature value of the switching tube is obtained by the temperature detection device, and the temperature value is compared with a preset temperature value, so that the magnitude of the current flowing through the switching tube is determined according to the comparison result.

If the temperature value of the switching tube is lower than the preset temperature value, the current flowing through the switching tube is considered to be in a normal range, and if the temperature value of the switching tube is not lower than the preset temperature value, the current flowing through the switching tube is considered to be in an abnormal range. At this time, the duty ratio of the pulse width modulation signal of the switching tube is reduced so as to reduce the on time of the switching tube in unit time, and the heating value of the switching tube is reduced under the condition of reducing the on time of the switching tube in unit time, thereby improving the reliability of the cooking appliance during operation.

In one possible embodiment, the preset temperature value may be set according to the specifications of the switching tube.

In any of the above technical solutions, the method further includes: and the relay is connected with the controller and is positioned at the input end of the frequency converter and used for controlling the on-off of the power supply signal.

In the technical scheme, the relay is arranged, so that the controller can control the power supply signal by controlling the conduction state of the relay, and in the process, the power supply of the cooking appliance can be directly cut off under the condition that the operation of the cooking appliance is abnormal, thereby providing a foundation for protecting all components in the cooking appliance.

In one possible technical scheme, when the operation time of the frequency converter exceeds the preset time, the relay is controlled to act so as to cut off the power supply of the cooking utensil.

In one possible solution, when the temperature value exceeds a preset temperature value, the relay is controlled to act so as to cut off the power supply to the cooking appliance.

In one embodiment, the rectifier has a first input and a second input, wherein the first input and the second input are connected to a neutral line and a live line of the alternating current, respectively.

In one of the technical solutions, the fuse is located on the neutral line and the relay is located on the fire line.

In any of the above technical solutions, the method further includes: the timer is connected with the frequency converter and is positioned at the input end of the frequency converter and used for setting the working time length of the timer; under the condition that the continuous working time of the timer is longer than or equal to the working time, the timer cuts off the power supply of the frequency converter.

In the technical scheme, a timer is arranged in the cooking appliance, wherein the timer has the functions of timing and switching, and a user can set the working time length through the timer according to actual use requirements so as to control the power supply of the frequency converter according to the working time length.

In one of the technical schemes, the working time of the timer can be replaced by the power-on time of the frequency converter so as to meet the control requirements of different control logics.

In any of the above aspects, the input device includes: a first power supply for outputting an electrical signal; the first end of the voltage dividing circuit is connected with the first power supply, the second end of the voltage dividing circuit is grounded and used for dividing the electric signal, and the voltage dividing circuit is provided with a first output interface and is used for being connected with a first input interface of the frequency converter; the trigger component is connected with the voltage dividing circuit, the trigger component is provided with a plurality of trigger states, the voltage value output by the first output interface corresponds to the trigger state, when the trigger component receives the 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 parameters according to the voltage value output by the first output interface.

In this embodiment, the input device can realize control parameters of the cooking appliance by only using one first output interface matched with the first input interface, and compared with a control scheme that each control parameter corresponds to one output interface, the control scheme reduces the number of interfaces in the frequency converter, and meanwhile, the number of interfaces is reduced, so that the assembly difficulty between the input device and the frequency converter is also reduced.

The input device utilizes the voltage dividing circuit to realize multiplexing of a single interface by utilizing different voltage values output by the first output interface under the triggering states of different triggering components, specifically, a first power supply is arranged, and the first power supply is utilized to provide an electric signal so that the voltage dividing circuit can divide the electric signal, and under the condition that the first output interface on the voltage dividing circuit is fixed, the triggering state corresponding to the triggering component connected with the voltage dividing circuit corresponds to the voltage value output by the first output interface. Based on the above, each trigger state can be used for representing one input control parameter, the input of the control parameter is realized by selecting the trigger state corresponding to the control parameter, the identification of the trigger state is realized by detecting the voltage value output by the first output interface, and the acquisition of the control parameter is further realized.

Because the input device and the frequency converter only need the first input interface to realize the input of control parameters, a computer board is not required to be arranged between the input device and the frequency converter, thereby reducing the manufacturing cost of the cooking utensil.

In one possible embodiment, the triggering component may be a switching device, such as an optocoupler.

In one possible embodiment, the voltage dividing circuit and the triggering component may be combined to form a whole, such as a slide rheostat, a potentiometer, or a device using light sensation, wireless isovolumetric value change, etc.

In one possible embodiment, the voltage divider circuit includes: a first resistor; the first ends of the N second resistors which are sequentially connected in series are connected with a first power supply, the second ends of the N second resistors which are sequentially connected in series are connected with the first ends of the first resistors, and the second ends of the first resistors are grounded; the trigger assembly includes: n switching devices corresponding to the N second resistors; the first end of each switching device is connected with the second end of the second resistor, and the second end of each switching device is connected with the first power supply; the first end of the first resistor is a first output interface.

In one possible embodiment, the voltage divider circuit includes: a first resistor; the first end of the first resistor is connected with the first power supply, the second end of the first resistor is connected with the first ends of the N second resistors which are sequentially connected in series, and the second ends of the N second resistors which are sequentially connected in series are grounded; the trigger assembly includes: n switching devices corresponding to the N second resistors; the first end of each switching device is connected with the first end of the second resistor, and the second end of each switching device is grounded; the second end of the first resistor is a first output interface.

In this embodiment, the connection structure of the voltage dividing circuit is specifically defined, and based on the connection relationship between the first resistor and the N second resistors and the N switching devices, when the switching devices are turned on, one or more second circuits can be turned on, and when the electrical signal is unchanged, the first end of the first resistor changes, and when the correspondence relationship between the voltage value output by the first end of the first resistor when each of the N switching devices is turned on is preset, after the voltage value is detected, the turned-on switching device of the N switching devices can be identified according to the voltage value output by the first end of the first resistor. In this process, when the user enters the control parameter by means of the conduction of the switching device, the user's input can be converted into a voltage value for identification by the frequency converter.

For example, the first resistor and the second resistor have a resistance value of 1 ohm, N has a value of 9, the voltage of the electrical signal is 10 volts, and if the switching device corresponding to the second resistor nearest to the first resistor is turned on, the voltage detected by the first input interface of the frequency converter is 1 volt.

When the 5 th switching device is turned on, the 5 second resistors are shorted, and the voltage value detected by the first input interface of the frequency converter is 10 volts×the resistance value of the first resistor/(the sum of the resistance values of the first resistor and the resistance values of the remaining four second resistors), that is, 2 volts, obviously, when the voltage value of 2 volts is detected, it can be directly determined that the 5 th switching device is turned on.

In one possible embodiment, the voltage dividing circuit further has a second output interface, where the second output interface is a connection point of any two adjacent second resistors and is used for being connected with a second input interface of the frequency converter, when the trigger component receives the second input operation, the trigger component 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, and the frequency converter determines the trigger state of the trigger component according to the voltage values output by the second output interface and the first output interface.

In this embodiment, a determination manner that can improve accuracy is defined, specifically, when the switching device corresponding to the second output interface is turned on, a part of the second resistors are short-circuited, and under the condition that the electrical signal is unchanged, the voltage drop on each second resistor is increased compared with the voltage drop before the switching device corresponding to the second output interface is turned on, at this time, the difference between the voltage values corresponding to different triggering states in the triggering component is increased, so that the detection accuracy of the frequency converter can be improved.

For example, the first resistor and the second resistor have a resistance value of 1 ohm, N has a value of 9, the voltage of the electrical signal is 10 volts, and if the switching device corresponding to the second resistor nearest to the first resistor is turned on, the voltage detected by the first input interface of the frequency converter is 1 volt.

If the 5 th switching device is turned on and is used as the second output interface of the input device, since the 5 th switching device is turned on and the 5 second resistors are shorted, the voltage value detected by the first input interface of the frequency converter is 10 volts×the sum of the resistance value of the first resistor/(the resistance value of the first resistor+the resistance values of the remaining four second resistors), that is, 2 volts, obviously, 2 volts is larger than 1 volt in the foregoing, so that the detection accuracy of the frequency converter is improved.

In one possible embodiment, the input device further comprises: the third resistor is positioned between the first output interface and the first input interface; the first end of the first capacitor is connected with the first input interface, and the second end of the first capacitor is grounded.

In this embodiment, by providing the third resistor so as to limit the magnitude of the voltage flowing into the frequency converter by using the third resistor, the frequency converter is prevented from being damaged due to the excessively large input voltage.

In the technical scheme, the first capacitor is arranged so as to filter clutter input into the frequency converter by using the first capacitor, and influence of the clutter in the frequency converter on the input control parameters is reduced.

In one of the solutions, reducing the effect of clutter in the frequency converter on the entered control parameters can be understood as the accuracy of the identification of clutter impact level signals input into the frequency converter.

In one of the embodiments, the input device further includes: the fourth resistor is positioned between the second output interface and the second input interface; and the first end of the second capacitor is connected with the second input interface, and the second end of the second capacitor is grounded.

In this embodiment, by providing the fourth resistor so as to limit the magnitude of the voltage flowing into the frequency converter by using the fourth resistor, the frequency converter is prevented from being damaged due to the excessively large input voltage.

In the technical scheme, the second capacitor is arranged so as to filter clutter input into the frequency converter by using the second capacitor, and influence of the clutter in the frequency converter on the input control parameters is reduced.

In one of the solutions, reducing the effect of clutter in the frequency converter on the entered control parameters can be understood as the accuracy of the identification of clutter impact level signals input into the frequency converter.

In any of the above technical solutions, the input device is: a key-press type input device and/or a knob type input device.

In this embodiment, the possible forms of the input device are defined in particular, wherein a knob-type input device is understood to be a device in which the adjustment of the control parameters is achieved by rotating a knob, and a key-type input device is understood to be a device in which the adjustment of the control parameters is achieved by pressing a key.

In one possible embodiment, 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.

In any of the above technical solutions, the cooking appliance includes: and the microwave generating circuit is used for transmitting microwave signals to the cooking cavity so as to cook food materials in the cooking cavity.

In the technical scheme, the cooking utensil is further provided with the cooking cavity by limiting, so that food materials are contained by the cooking cavity, and the food materials are cooked by the microwave signals, so that the utilization of the microwave signals is realized.

In any of the above technical solutions, the cooking appliance includes a microwave oven or a micro-steaming and baking integrated machine.

In any of the above aspects, the microwave oven comprises a mechanical microwave oven.

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.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 illustrates one of the connection schematic diagrams of a cooking appliance in an embodiment of the present invention;

FIG. 2 shows a second schematic diagram of a connection of a cooking appliance according to an embodiment of the present invention;

FIG. 3 shows one of the topology diagrams of the input device in an embodiment of the invention;

FIG. 4 is a schematic diagram of a second topology of an input device according to an embodiment of the invention;

FIG. 5 is a third schematic diagram of the topology of the input device according to the embodiment of the invention;

FIG. 6 shows a fourth schematic topology of an input device in an embodiment of the invention;

FIG. 7 shows one of the schematic diagrams of the input device in an embodiment of the invention;

FIG. 8 shows a second schematic diagram of an input device according to an embodiment of the invention;

FIG. 9 is a third schematic diagram of the input device according to the embodiment of the invention;

FIG. 10 shows a fourth schematic diagram of an input device in an embodiment of the invention;

FIG. 11 is a schematic diagram of an input device according to an embodiment of the invention;

fig. 12 shows one of connection schematic diagrams of the cooking appliance in the embodiment of the present invention.

The correspondence between the reference numerals and the component names in fig. 1 to 6 and 12 is:

102 zero crossing detection circuit, 104 microwave generation circuit, 106 converter, 1062 controller, 1064 rectifier, 108 fuse, 110 voltage regulation circuit, 112 relay, 114 input device, 116 timer, 118 filter circuit, D furnace lamp, 120 fan, 122 rotation tray, Q switch tube, T transformer, VCC first power supply, R1 first resistance, R2 second resistance, R3 third resistance, R4 fourth resistance, K switching device, C1 first capacitor, C2 second capacitor.

Detailed Description

So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized below, may be had by reference to the appended drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

Example 1

As shown in fig. 1 and 2, the present invention provides a cooking appliance including: a microwave generating circuit 104; a frequency converter 106 connected to the microwave generation circuit 104; the input device 114 is connected to the frequency converter 106, and is configured to receive control parameters of the cooking appliance, so as to control the frequency converter 106 to drive the microwave generating circuit 104 to operate according to the control parameters.

In this embodiment, the proposed cooking appliance adopts the frequency converter 106 to control the operation of the microwave generating circuit 104, and the frequency converter 106 is used to control the operation of the microwave generating circuit 104 to realize the linear output of power, so that the energy efficiency of the cooking appliance in unit time is higher than that of the cooking appliance controlled by adopting the transformer in the related technical scheme, and further, the cooking appliance meets the current low-carbon environment-friendly requirement.

Since the input device 114 is directly connected to the frequency converter 106, the frequency converter 106 can obtain the control parameter entered by the user, and drive the microwave generating circuit 104 to operate according to the control parameter.

In one embodiment, the control parameters include time parameters and/or power parameters.

In one embodiment, it is understood that the time parameter, i.e., the duration of the microwave generation circuit emitting microwaves, and the power parameter, it is understood that the microwave generation circuit emits microwave power.

Specifically, for example, when 1 minute is selected on the time parameter and 700 watts is selected on the power parameter, the microwave generating circuit emits 700 watts of microwaves and operates for 1 minute.

For example, if the time parameter is selected for 2 minutes and the power parameter is selected for 900 watts, the microwave generating circuit 104 emits 900 watts of microwaves and operates for 2 minutes.

In one embodiment, the frequency converter 106 includes a switching tube Q, wherein the linear output power of the microwave generating circuit 104 is achieved by controlling the conduction angle of the switching tube Q.

In one embodiment, the cooking appliance further comprises: the zero-crossing detection circuit 102 is used for acquiring the power supply frequency of the power supply signal; the frequency converter 106 further includes a controller 1062, where the controller 1062 is connected to the zero-crossing detection circuit 102 and the switching tube Q, and is configured to utilize the power supply frequency to time the operation duration of the frequency converter 106, and control the switching tube Q to be turned off and cut off the power supply of the microwave generating circuit 104 when the operation duration of the frequency converter 106 is greater than or equal to a preset duration.

In this embodiment, the cooking apparatus at least includes a frequency converter 106 and a microwave generating circuit 104 connected to the frequency converter 106, in this embodiment, since the frequency converter 106 has a timing function and is provided with a longest operation time, that is, a preset duration in the present application, during operation of the frequency converter 106, an operation duration of the frequency converter 106 is recorded, and under a condition that the operation duration is not less than the preset duration, the frequency converter 106 works according to a user's set requirement, that is, the microwave generating circuit 104 is driven to operate; and when the operation duration is equal to or exceeds the preset duration, the switch tube Q is controlled to cut off the frequency converter 106, and when the switch tube Q is cut off, the frequency converter 106 cuts off the power supply of the microwave generating circuit 104, and correspondingly, the microwave generating circuit 104 is stopped to operate due to power failure, so that the stable operation of the cooking utensil is ensured.

In one possible embodiment, the cooking appliance includes the zero-crossing detection circuit 102, so that the power supply frequency of the power supply signal detected by the zero-crossing detection circuit 102 is used for timing, specifically, the time of each zero-crossing point of the power supply signal can be determined according to the power supply frequency, and the determination of the operation duration is realized by counting the number of times of zero-crossing points.

In the above embodiment, since the proposed cooking appliance has no timer, the situation that the cooking appliance is blocked due to the failure of the timer does not occur in the use process, so that when the timer is blocked, the microwave oven continuously works at this time, thereby causing the occurrence of events such as fire accidents, and further improving the use safety of the cooking appliance.

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 works to operate the microwave generating circuit 104 after being powered on, and the frequency converter 106 is connected to the microwave generating circuit 104.

In one possible embodiment, since the input device 114 is directly connected to the frequency converter 106, rather than being located on the circuit structure where the frequency converter 106 and the microwave generating circuit 104 are powered,

in this case, even if the input device 114 malfunctions, since the inverter 106 has the longest operation time, the influence of the malfunction of the input device 114 on the microwave generating circuit 104 can be minimized, thereby improving the reliability of the cooking appliance in operation.

In one embodiment, the input device 114 is located on a control panel of the cooking appliance.

In one possible embodiment, the microwave generating circuit 104 includes: and the magnetron generates a microwave signal after being electrified so as to realize cooking by using the microwave signal.

In one possible embodiment, the method further comprises: the input end of the voltage doubling circuit is connected with the second secondary coil of the transformer T, and the output end of the voltage doubling circuit is connected with the magnetron.

In this embodiment, the voltage doubler circuit is used to increase the voltage input to the magnetron so that the magnetron can be operated in a state satisfying its operation requirement and generate microwaves.

In this embodiment, the voltage doubling circuit is provided to realize the starting of the magnetron without requiring a very high voltage output from the second secondary coil, and at the same time, the voltage doubling circuit is provided to reduce the specification requirement of the transformer T, so as to reduce the manufacturing cost of the cooking appliance.

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

In this embodiment, a specific topology of the voltage doubling circuit is specifically defined, wherein the voltage doubling circuit comprises at least a first diode and a second diode in series, a third capacitor and a fourth capacitor in series and a fifth resistor. After receiving the power supply signal from the second secondary coil, the voltage doubling circuit formed by the device can form a higher voltage difference on the resistor so as to improve the input voltage value of the magnetron by using the resistor.

Example two

In the above embodiment, the frequency converter 106 further includes: the first end of the switching tube Q is used for receiving a power supply signal; the primary coil of the transformer T is connected with the second end of the switching tube Q, and the first secondary coil of the transformer T is connected with the microwave generation circuit 104; the controller 1062 is connected to a control terminal of the switching tube Q, and controls the switching tube Q to be turned off when the operation duration of the frequency converter 106 is greater than or equal to a preset duration.

In this embodiment, a specific structure of the inverter 106 is specifically defined, wherein the inverter 106 includes at least a controller 1062, a switching tube Q connected to the controller 1062, and a transformer T connected to the switching tube Q.

In this embodiment, the power supply control of the microwave generating circuit 104 may be implemented based on the connection relationship of the transformer T, the switching tube Q, and the microwave generating circuit 104, so as to supply power to the microwave generating circuit 104.

By defining the presence of the switching tube Q, control of the power supply of the microwave generating circuit 104 is achieved by controlling the switching of the switching tube Q. In addition, due to the controller 1062, the operation time of the switching tube Q may be recorded, and the operation time of the switch may be controlled as the operation time of the frequency converter 106, so as to cut off the power supply of the microwave generating circuit 104 when the operation time of the frequency converter 106 is equal to or exceeds the preset time.

In one possible embodiment, the first secondary coil has a first connection end and a second connection end, and it is understood that the first connection end and the second connection end are two connection terminals of the first secondary coil, respectively, where the first connection end is connected to a first input end of the microwave generating circuit 104, and the second connection end is connected to a second input end of the microwave generating circuit 104.

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

In one possible embodiment, the switching tube Q is a power tube.

Example III

In one possible embodiment, the method further comprises: the fuse 108 is connected to the inverter 106 and is located at an input end of the inverter 106.

In this embodiment, a fuse 108 is connected in series to 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 known that when the current flowing through the fuse 108 exceeds the rated current of the fuse 108, the fuse 108 triggers to blow, so that the power supply to the frequency converter 106 is cut off, and the protection of the cooking appliance is realized when the current abnormality occurs during the operation of the cooking appliance, and in this process, the electricity safety of the cooking appliance is improved.

In addition, by defining the fuse 108 at the input of the inverter 106 so as to separate the inverter 106 from the portion supplying power to the inverter 106 in the event that the fuse 108 is blown when the cooking appliance is in operation, the separated inverter 106 is no longer connected to the portion supplying power to the inverter 106, and damage to the inverter 106 due to connection to the portion supplying power to the inverter 106 in the event that the fuse 108 is blown is avoided.

Example IV

In one possible embodiment, the frequency converter 106 further comprises: a rectifier 1064 is located between the fuse 108 and the inverter 106.

In this embodiment, the rectifier 1064 is provided to shape the power supply signal of the cooking appliance, so as to obtain a power supply signal that can be adapted to the frequency converter 106, in particular, to convert the alternating current into the direct current, in the process, so that the cooking appliance can be adapted to various use scenarios.

Example five

In one possible embodiment, the method further comprises: the voltage regulating circuit 110 is connected to the output end of the rectifier 1064 and the controller 1062, and is used for adjusting the voltage value of the power supply signal to a target voltage value for the controller 1062 to perform power-on operation.

In this embodiment, the voltage regulating circuit 110 is configured and defined to be connected to the controller 1062, so that the voltage regulating circuit 110 is used to take power from the power supply loop of the frequency converter 106 and supply power to the controller 1062, and in this process, no separate power supply is needed to be provided for the controller 1062, so that the power supply of the controller 1062 is simplified.

Further, by defining the voltage regulating circuit 110, the voltage value of the power supply signal can be adjusted to a target voltage value to provide a stable power supply to the controller 1062 so as to ensure a stable operation of the controller 1062.

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

In one possible embodiment, the target voltage value may be 3 volts, 5 volts, 12 volts, 36 volts, etc. The specific value may be determined by the choice of controller 1062.

In one possible embodiment, the target voltage values include a first target voltage value for powering the controller 1062 and a second target voltage value for powering the relay 112.

Example six

In one possible embodiment, the method further comprises: temperature detecting means for obtaining the temperature value of the switching tube Q, the controller 1062 is further configured to: and under the condition that the temperature value is larger than or equal to a preset temperature value, the duty ratio of the pulse width modulation signal of the switching tube Q is reduced or the switching tube Q is controlled to be cut off.

In one possible embodiment, the duty cycle of the pwm signal of the switching 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, wherein the first duty cycle is the duty cycle before the decrease and the second duty cycle is the duty cycle after the decrease.

In this embodiment, the temperature detecting device is provided to detect the operation state of the switching tube Q by using the temperature detecting device, and then the switching tube Q is controlled when it is detected that the switching tube Q is operated in a dangerous state, so as to reduce the probability of damage to the cooking appliance.

In particular, in the event of an excessive current flowing through the frequency converter 106, the frequency converter 106 is extremely prone to failure. The failure of the frequency converter 106 is mainly shown in the damage of the switching tube Q, when the current flowing through the frequency converter 106 is too large, the current flowing through the switching tube Q will also become large, and when the current flowing through the frequency converter is too large, the heat productivity of the switching tube Q will increase, and the operation parameters of the switching tube Q will be as follows: the temperature of the switching tube Q. Therefore, the embodiment of the application is provided with a temperature detection device, the temperature value of the switching tube Q is obtained by using the temperature detection device, and the temperature value is compared with a preset temperature value, so that the magnitude of the current flowing through the switching tube Q is determined according to the comparison result.

If the temperature value of the switching tube Q is lower than the preset temperature value, the magnitude of the current flowing through the switching tube Q is considered to be in a normal range, and if the temperature value of the switching tube Q is not lower than the preset temperature value, the magnitude of the current flowing through the switching tube Q is considered to be in an abnormal range. At this time, by reducing the duty ratio of the pwm signal of the switching tube Q so as to reduce the on time of the switching tube Q in unit time, the heat generation amount of the switching tube Q is reduced under the condition of reducing the on time of the switching tube Q in unit time, thereby improving the reliability of the cooking appliance during operation.

In one possible embodiment, the preset temperature value may be set according to the specification of the switching tube Q.

In one of the possible embodiments, the temperature detection device is located on the switching tube Q or within a preset range of the switching tube Q, wherein the preset range may be according to the actual usage field Jing Xuanqu.

Example seven

In one possible embodiment, the method further comprises: the relay 112 is connected to the controller 1062 of the frequency converter 106, and is located at an input end of the frequency converter 106, and is used for controlling on-off of a power supply signal.

In this embodiment, by providing a relay 112, the controller 1062 may control the power supply signal by controlling the on state of the relay 112, and in this process, in the case of abnormal operation of the cooking appliance, the power supply of the cooking appliance may be directly cut off, so as to provide a basis for protecting components in the cooking appliance.

In one possible embodiment, in case the operation time of the frequency converter 106 exceeds a preset time, the relay 112 is controlled to act so as to cut off the power supply to the cooking appliance.

In one possible embodiment, in case the temperature value exceeds a preset temperature value, the relay 112 is controlled to act so as to cut off the power supply to the cooking appliance.

In one embodiment, rectifier 1064 has a first input and a second input, where the first input and the second input are connected to the neutral and live wires, respectively, of the alternating current.

In one embodiment, the fuse 108 is located on the neutral line and the relay 112 is located on the fire line.

In one embodiment, the relay 112 is connected to the voltage regulator circuit 110 for powering up operation under power from the voltage regulator circuit 110.

Specifically, the relay 112 is powered on by the voltage regulating circuit 110, and the relay 112 is controlled to be opened or closed under the control of the controller 1062.

In one possible embodiment, the second duty cycle is equal to zero, i.e., the switching tube Q is controlled to be turned off, so as to control the microwave generating circuit 104 to stop operation.

Example eight

In one possible embodiment, as shown in fig. 12, further includes: the timer 116 is connected with the frequency converter 106, is positioned at the input end of the frequency converter 106 and is used for setting the working time length of the timer; where the duration of operation of the timer 116 is greater than or equal to the duration of operation, the timer 116 shuts off power to the frequency converter 106.

In this embodiment, a timer 116 is provided in the cooking appliance, wherein the timer 116 has functions of timing and switching, and a user can set an operating period through the timer 116 according to actual use needs, so as to control power supply of the frequency converter 106 according to the operating period.

In one embodiment, the working time of the timer 116 may be replaced by the power-on time of the frequency converter 106, so as to meet the control requirements of different control logic.

In one embodiment, the setting of the cooking duration may be achieved using timer 116 and the control of the cooking power may be achieved using input device 114.

Example nine

In one possible embodiment, as shown in fig. 3, 4, 5 and 6, the input device 114 includes: a first power supply VCC for outputting an electrical signal; the first end of the voltage dividing circuit is connected with the first power supply VCC, the second end of the voltage dividing circuit is grounded and used for dividing the electric signal, and the voltage dividing circuit is provided with a first output interface and is used for being connected with a first input interface of the frequency converter 106; the trigger component is connected with the voltage dividing circuit, the trigger component is provided with a plurality of trigger states, the voltage value output by the first output interface corresponds to the trigger state, when the trigger component receives the 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 106 determines the control parameter according to the voltage value output by the first output interface.

In this embodiment, the input device 114 can implement control parameters of the cooking appliance by using only one first output interface matched with the first input interface, so that the number of interfaces in the frequency converter 106 is reduced compared with the control scheme that each control parameter corresponds to one output interface, and meanwhile, the assembly difficulty between the input device 114 and the frequency converter 106 is reduced due to the reduction of the number of interfaces.

The input device 114 utilizes the voltage dividing circuit to realize multiplexing of a single interface by utilizing different voltage values output by the first output interface under the triggering states of different triggering components, specifically, a first power supply VCC is provided, and an electric signal is provided by utilizing the first power supply VCC, so that the voltage dividing circuit can divide the electric signal, and under the condition that the first output interface on the voltage dividing circuit is fixed, the triggering state corresponding to the triggering component connected with the voltage dividing circuit corresponds to the voltage value output by the first output interface. Based on the above, each trigger state can be used for representing one input control parameter, the input of the control parameter is realized by selecting the trigger state corresponding to the control parameter, the identification of the trigger state is realized by detecting the voltage value output by the first output interface, and the acquisition of the control parameter is further realized.

Because the input device 114 and the frequency converter 106 can realize the input of control parameters only by the first input interface, a computer board is not required to be arranged between the input device 114 and the frequency converter 106, thereby reducing the manufacturing cost of the cooking utensil.

In one possible embodiment, the triggering component may be a switching device, such as an optocoupler.

In one possible embodiment, the voltage dividing circuit and the triggering component may be combined to form a whole, such as a slide rheostat, a potentiometer, or a device using light sensation, wireless isovolumetric value change, etc.

In one possible embodiment, the voltage divider circuit includes: the first ends of the N second resistors R2 which are sequentially connected in series are connected with the first power supply VCC, the second ends of the N second resistors R2 which are sequentially connected in series are connected with the first ends of the first resistors R1, and the second ends of the first resistors R1 are grounded; the trigger assembly includes: n switching devices K corresponding to the N second resistors R2; wherein, the first end of each switching device K is connected with the second end of the second resistor R2, and the second end of each switching device K is connected with the first power supply VCC; the first end of the first resistor R1 is a first output interface.

In one possible embodiment, the voltage divider circuit includes: the first end of the first resistor R1 is connected with the first power supply VCC, the second end of the first resistor R1 is connected with the first ends of the N second resistors R2 which are sequentially connected in series, and the second ends of the N second resistors R2 which are sequentially connected in series are grounded; the trigger assembly includes: n switching devices K corresponding to the N second resistors R2; wherein, the first end of each switching device K is connected with the first end of the second resistor R2, and the second end of each switching device K is grounded; the second end of the first resistor R1 is a first output interface.

In this embodiment, the connection structure of the voltage dividing circuit is specifically defined, and based on the connection relationship between the first resistor R1 and the N second resistors R2 and the N switching devices K, it is known that when the switching devices K are turned on, one or more second circuits can change the first end of the first resistor R1 under the condition that the electrical signal is unchanged, and when the corresponding relationship of the voltage value output by the first end of the first resistor R1 is preset when each of the N switching devices K is turned on, after the voltage value is detected, the turned-on switching device K in 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 parameters with the switching device K on, the user's input may be converted into a voltage value for identification by the frequency converter 106.

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

When the 5 th switching device K is turned on, the 5 second resistors R2 are shorted, and the voltage detected by the first input interface of the frequency converter 106 is 10 volts×the sum of the resistance of the first resistor R1/(the resistance of the first resistor R1+the resistance of the remaining four second resistors R2), that is, 2 volts, it is obvious that when the voltage of 2 volts is detected, it is directly determined that the 5 th switching device K is turned on.

In one possible embodiment, the voltage dividing circuit further has a second output interface, where the second output interface is a connection point of any two adjacent second resistors R2 and is used to connect with a second input interface of the frequency converter 106, when the trigger component receives the second input operation, the trigger component 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, and the frequency converter 106 determines the trigger state of the trigger component according to the voltage values output by the second output interface and the first output interface.

In this embodiment, a determination manner that can improve the accuracy is defined, specifically, when the switching device K corresponding to the second output interface is turned on, a part of the second resistors R2 will be shorted, and under the condition that the electrical signal is unchanged, the voltage drop on each second resistor R2 will be increased compared with the voltage drop before the switching device K corresponding to the second output interface is turned on, at this time, the difference between the voltage values corresponding to different triggering states in the triggering component will be increased, so that the detection accuracy of the frequency converter 106 can be improved.

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

If the 5 th switching device K is turned on and is used as the second output interface of the input device 114, since the 5 th switching device K is turned on and the 5 second resistors R2 are shorted, the voltage value detected by the first input interface of the frequency converter 106 is 10 volts×the sum of the resistance value of the first resistor R1/(the resistance value of the first resistor R1+the resistance values of the remaining four second resistors R2), that is, 2 volts, obviously, 2 volts is larger than 1 volt in the foregoing, so the detection accuracy of the frequency converter 106 is improved.

In one possible embodiment, the input device 114 further comprises: the third resistor R3 is positioned between the first output interface and the first input interface; the first end of the first capacitor C1 is connected with the first input interface, and the second end of the first capacitor C1 is grounded.

In this embodiment, by providing the third resistor R3 so as to limit the magnitude of the voltage flowing into the inverter 106 by using the third resistor R3, the inverter 106 is prevented from being damaged due to the excessively large input voltage.

In this possible embodiment, the first capacitor C1 is configured to filter out the clutter input to the frequency converter 106, so as to reduce the influence of the clutter in the frequency converter 106 on the input control parameter.

In one possible embodiment, reducing the effect of clutter in the frequency converter 106 on the logged control parameters may be understood as the accuracy of the identification of clutter impact level signals input into the frequency converter 106.

In one possible embodiment, the input device 114 further comprises: the fourth resistor R4 is positioned between the second output interface and the second input interface; and the first end of the second capacitor C2 is connected with the second input interface, and the second end of the second capacitor C2 is grounded.

In this embodiment, by providing the fourth resistor R4 so as to limit the magnitude of the voltage flowing into the inverter 106 by using the fourth resistor R4, the inverter 106 is prevented from being damaged due to the excessively large input voltage.

In this possible embodiment, the second capacitor C2 is provided to filter out the clutter input to the frequency converter 106 by using the second capacitor C2, so as to reduce the influence of the clutter in the frequency converter 106 on the entered control parameters.

In one possible embodiment, reducing the effect of clutter in the frequency converter 106 on the logged control parameters may be understood as the accuracy of the identification of clutter impact level signals input into the frequency converter 106.

In one possible embodiment, the power parameter may be divided in different gear steps, such as: low fire, thawing, medium fire, medium and high fire, wherein each gear corresponds to a power value, and the power values corresponding to the low fire, thawing, medium fire, medium and high fire and the high fire are sequentially increased.

In one possible embodiment, the time parameter may be selected within a predetermined time interval, for example, a time interval of 10 seconds to 35 minutes.

In one possible embodiment, the switching device K may be in the form of a knob or a key.

In one possible embodiment, the resistance of one or more of the N second resistors is the same or may be different.

In one possible embodiment, the resistance of all of the N second resistors is the same.

In one possible embodiment, for convenience of distinction, the first resistor R1 is represented by R0, the N second resistors R2 are represented by the first resistor R01, the second resistor R02, and the third resistor R03 … …, the N-th resistor R0N, and the corresponding N switching devices K are represented by the first switching device K1, the second switching device K2 … …, and the N-1-th switching device Kn-1, respectively, for example, when the first switching device K1 is turned on, the level signal is V _I/0 ＝VCC×R0/(R02+…+R0n)。

Input device 114 in one possible embodiment, input device 114 may also have a display interface for interacting with a user in order to enhance the user's interaction experience.

In one possible embodiment, the display interface is used to display at least one of a currently entered time parameter and a power parameter.

In addition, the input device 114 can use a small number of data interfaces to realize the input of time parameters and power parameters, namely, the input of two parameters is realized by using the same device, namely, the input of the power parameters can be realized by using the input device 114 of the time parameters, and the input of the time parameters can also be realized by using the input device 114 of the power parameters, so that the multiplexing of the existing input device 114 is realized, and therefore, the space occupation of the input device 114 in the cooking appliance can be reduced while the manufacturing cost of the cooking appliance is reduced, and the miniaturization of the cooking appliance is facilitated.

In one possible embodiment, as shown in fig. 7, 8, 9, 10 and 11, the input device 114 is: a key input device 114 and/or a knob input device 114.

In this embodiment, a possible form of the input device 114 is specifically defined, wherein the knob-type input device 114 may be understood as implementing adjustment of the control parameter by rotating a knob, and the key-type input device 114 may be understood as implementing adjustment of the control parameter by pressing a key.

In particular, the input device 114 is essentially a control switch, and the key input device 114 and/or the knob input device 114 can be understood as implementing input according to different operation modes, which can be key, knob, combination or multiplexing, wherein the combination or multiplexing is power, time multiplexing adjustment.

In one possible embodiment, the key input device 114 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.

In one possible embodiment, a single knob input 114 is employed to effect entry of one or both of the time parameter and the power parameter, specifically, the time parameter is entered when starting with a default position and rotating in a clockwise direction, and the power parameter is entered when starting with a default position and rotating in a counterclockwise direction.

In one possible embodiment, when a single knob input device 114 is used to achieve entry of one or both of the time parameter and the power parameter, if rotation of the knob to the default position is detected, the entry is made within a set period of time, all of which are adjustments to the parameters determined by rotation to the default position. For example, when starting with the default position and rotating clockwise, the time parameters are recorded in the set time length; similarly, when starting with the default position and rotating in the counterclockwise direction, the input of the set duration is the input of the power parameter, so as to realize the multiplexing of the single-knob input device 114.

In one possible embodiment, the default position is a position in the single knob input 114 where the pointer indication is zero.

In one possible embodiment, as shown in fig. 7, 8, 9, 10 and 11, each key corresponds to a switching device K, and when the key is pressed, the corresponding switching device K is turned on.

Examples ten

In one possible embodiment, a cooking appliance includes: the cooking cavity, the microwave generating circuit 104 is configured to emit a microwave signal into the cooking cavity to cook food items located in the cooking cavity.

In this embodiment, the cooking appliance is further defined as having a cooking cavity, so as to contain the food material by using the cooking cavity, and cook the food material by using the microwave signal, thereby realizing the use of the microwave signal.

In one possible embodiment, the cooking appliance comprises a microwave oven or a micro-steaming and baking all-in-one machine.

In this embodiment, the cooking appliance includes, but is not limited to, a microwave oven or a micro-steaming and baking all-in-one machine as above, which may be a cooking appliance having the above-described frequency converter 106 and microwave generating circuit 104.

In this embodiment, in case the cooking appliance is a micro-steaming and baking all-in-one machine, the cooking appliance further has a steam generating device and a baking device, wherein the steam generating device is used for outputting 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, wherein the baking device may be a heating pipe or a hot air heating device, wherein the heating pipe is located at the top of the cooking cavity, and the hot air heating device is located at the back of the cooking cavity.

In one possible embodiment, the microwave oven may be a flat panel microwave oven.

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

As shown in fig. 12, in one embodiment, the microwave oven further includes a filter circuit 118 connected to the power connector for filtering the interference signal in the power supply signal, wherein the fuse 108 is disposed in the filter circuit 118 for limiting the current of the power supply signal, so as to reduce the possibility of damage of the microwave oven due to overcurrent.

In one embodiment, the microwave oven further comprises a furnace lamp D and a fan 120, wherein the furnace lamp D is used for providing illumination for the cooking cavity, and the fan 120 is used for accelerating heat transfer between the microwave oven and the environment, so as to realize ventilation and heat dissipation.

In the case that the microwave oven is a mechanical microwave oven, the microwave oven further comprises a motor and a rotating tray 122, wherein the food is positioned on the rotating tray 122, the motor is connected with the rotating tray 122 and used for driving the rotating tray 122 to rotate, so that the rotating tray can rotate simultaneously under the condition that the magnetron outputs microwave signals, and further the food can be uniformly heated, and the situation that the local position of the food is burnt is avoided.

In the description of the present invention, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present invention, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. A cooking appliance, comprising:

a microwave generating circuit;

the frequency converter is connected with the microwave generating circuit;

and the input device is connected with the frequency converter and used for receiving control parameters of the cooking utensil so as to control the frequency converter to drive the microwave generating circuit to operate according to the control parameters.

2. Cooking appliance according to claim 1, characterized in that the control parameters comprise time parameters and/or power parameters.

3. The cooking appliance of claim 1, wherein the cooking appliance further comprises: the zero-crossing detection circuit is used for acquiring the power supply frequency of the power supply signal;

the frequency converter comprises a controller and a switching tube, wherein the controller is connected with the zero-crossing detection circuit and the switching tube and is used for timing the operation duration of the frequency converter by using the power supply frequency, and the switching tube is controlled to cut off under the condition that the operation duration of the frequency converter is longer than or equal to the preset duration, so that the power supply of the microwave generation circuit is cut off.

4. A cooking appliance according to claim 3, wherein the frequency converter further comprises:

the first end of the switch tube is used for receiving the power supply signal;

the primary coil of the transformer is connected with the second end of the switching tube, and the first secondary coil of the transformer is connected with the microwave generating circuit;

the controller is connected with the control end of the switching tube, and the switching tube is controlled to be cut off under the condition that the running time length of the frequency converter is longer than or equal to the preset time length.

5. The cooking appliance of claim 4, further comprising:

and the fuse is connected with the frequency converter and is positioned at the input end of the frequency converter.

6. The cooking appliance of claim 5, wherein the frequency converter further comprises:

and the rectifier is positioned between the fuse and the frequency converter.

7. The cooking appliance of claim 6, further comprising:

and the voltage regulating circuit is connected with the output end of the rectifier and the controller and is used for regulating the voltage value of the power supply signal to a target voltage value so as to enable the controller to run in a power-on mode.

8. The cooking appliance of claim 4, further comprising: the temperature detection device is used for acquiring the temperature value of the switching tube, and the controller is also used for:

and under the condition that the temperature value is larger than or equal to a preset temperature value, reducing the duty ratio of the pulse width modulation signal of the switching tube or controlling the switching tube to cut off.

9. The cooking appliance of claim 5, further comprising:

and the relay is connected with the controller, is positioned at the input end of the frequency converter and is used for controlling the on-off of the power supply signal.

10. The cooking appliance of any one of claims 1 to 7, further comprising:

the timer is connected with the frequency converter and is positioned at the input end of the frequency converter and used for setting the working time length of the timer;

and under the condition that the continuous working time of the timer is longer than or equal to the working time, the timer cuts off the power supply of the frequency converter.

11. The cooking appliance according to any one of claims 1 to 7, wherein the input device includes:

a first power supply for outputting an electrical signal;

the first end of the voltage dividing circuit is connected with the first power supply, the second end of the voltage dividing circuit is grounded and used for dividing the electric signal, and the voltage dividing circuit is provided with a first output interface and used for being connected with a first input interface of the frequency converter;

the trigger component is connected with the voltage dividing circuit and provided with a plurality of trigger states, the voltage value output by the first output interface corresponds to the trigger state,

when the trigger component receives a first input operation, the trigger component enters a trigger state corresponding to the first input operation, the voltage dividing circuit outputs a voltage value corresponding to the trigger state through the first output interface, and the frequency converter determines the control parameter according to the voltage value output by the first output interface.

12. The cooking appliance of claim 11, wherein the voltage divider circuit comprises:

a first resistor;

the first ends of the N second resistors which are sequentially connected in series are connected with the first power supply, the second ends of the N second resistors which are sequentially connected in series are connected with the first ends of the first resistors, and the second ends of the first resistors are grounded;

the trigger assembly includes:

n switching devices corresponding to the N second resistors;

wherein a first end of each switching device is connected with a second end of the second resistor, and a second end of each switching device is connected with the first power supply;

the first end of the first resistor is the first output interface.

13. The cooking appliance of claim 11, wherein the voltage divider circuit comprises:

a first resistor;

the first ends of the first resistors are connected with the first power supply, the second ends of the first resistors are connected with the first ends of the N second resistors which are sequentially connected in series, and the second ends of the N second resistors which are sequentially connected in series are grounded;

the trigger assembly includes:

N switching devices corresponding to the N second resistors;

wherein a first end of each switching device is connected with a first end of the second resistor, and a second end of each switching device is grounded;

the second end of the first resistor is the first output interface.

14. The cooking appliance of claim 12 or 13, wherein the cooking appliance comprises a cooking chamber,

the voltage dividing circuit is further provided with a second output interface, wherein the second output interface is a connection point of any two adjacent second resistors and is used for being connected with a second input interface of the frequency converter, when the trigger component receives a second input operation, the trigger component 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, and the frequency converter determines the trigger state of the trigger component according to the voltage values output by the second output interface and the first output interface.

15. Cooking appliance according to claim 12 or 13, wherein the input device further comprises:

a third resistor positioned between the first output interface and the first input interface;

The first end of the first capacitor is connected with the first input interface, and the second end of the first capacitor is grounded.

16. The cooking appliance of claim 14, wherein the input device further comprises:

a fourth resistor positioned between the second output interface and the second input interface;

and the first end of the second capacitor is connected with the second input interface, and the second end of the second capacitor is grounded.

17. Cooking appliance according to any one of claims 1 to 7, characterized in that the input means are: a key-press type input device and/or a knob type input device.

18. The cooking appliance according to any one of claims 1 to 7, wherein the cooking appliance comprises:

and the microwave generation circuit is used for transmitting microwave signals to the cooking cavity so as to cook food materials in the cooking cavity.

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