CN115884456A - Cooking apparatus - Google Patents

Abstract

The invention discloses a cooking apparatus, which comprises: the control panel comprises a load control module, a power selection module, a zero-crossing detection module and a main control module, the input end of the timer is suitable for being connected with a power supply, the input end of the load control module is connected with the output end of the timer, the output end of the load control module is connected with the microwave generation circuit, the main control module is used for controlling the load control module according to a power selection instruction so as to adjust the running power of the microwave generation circuit, determining the working time of the microwave generation circuit according to a zero-crossing signal, and controlling the load control module to be disconnected when the working time of the microwave generation circuit reaches preset time so as to cut off the power supply of the microwave generation circuit. This cooking utensil passes through host system automatic cutout microwave generating circuit's power supply when cooking equipment's duration operating time reaches the time of predetermineeing to play the guard action, effectively prevent the emergence of risk of catching fire.

Description

Cooking apparatus

Technical Field

The invention relates to the technical field of household appliances, in particular to cooking equipment.

Background

The mechanical microwave oven consists of timer, transformer and microwave generator. Because the timer depends on the mechanical action of the gear to meet the functional requirements, the phenomenon of locking can occur. When the timer is stuck, the microwave oven continuously works, thereby causing fire accidents and causing property loss to users and companies.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide cooking equipment, which can automatically cut off the power supply of a microwave generating circuit through a main control module when the continuous working time of the cooking equipment reaches the preset time under the condition that a timer is blocked and the cooking equipment continuously works, so that the protection effect is achieved, and the fire risk is effectively prevented.

In order to achieve the above object, an embodiment of the present invention provides a cooking apparatus, including: the microwave power generation device comprises a timer, a control panel and a microwave generation circuit, wherein the control panel comprises a load control module, a power selection module, a zero-crossing detection module and a main control module, the input end of the timer is suitable for being connected with a power supply, the input end of the load control module is connected with the output end of the timer, the output end of the load control module is connected with the microwave generation circuit, the main control module is respectively connected with the load control module, the power selection module and the zero-crossing detection module, and the power selection module is used for receiving a power selection instruction; the timer is used for timing the working time of the microwave generating circuit and disconnecting the power supply when the timing time is up; the zero-crossing detection module is used for carrying out zero-crossing detection on a power supply accessed by the timer to obtain a zero-crossing signal; the main control module is used for controlling the load control module according to the power selection instruction so as to adjust the running power of the microwave generating circuit, determining the working time of the microwave generating circuit according to the zero-crossing signal, and controlling the load control module to be disconnected when the working time of the microwave generating circuit reaches the preset time so as to cut off the power supply of the microwave generating circuit, wherein the preset time is more than or equal to the timing time.

A cooking apparatus according to an embodiment of the present invention includes: the microwave power generation device comprises a timer, a control panel and a microwave generation circuit, wherein the control panel comprises a load control module, a power selection module, a zero-crossing detection module and a main control module, the input end of the timer is suitable for being connected with a power supply, the input end of the load control module is connected with the output end of the timer, the output end of the load control module is connected with the microwave generation circuit, the main control module is respectively connected with the load control module, the power selection module and the zero-crossing detection module, and the power selection module is used for receiving a power selection instruction; the timer is used for timing the working time of the microwave generating circuit and disconnecting the power supply when the timing time is up; the zero-crossing detection module is used for carrying out zero-crossing detection on a power supply accessed by the timer to obtain a zero-crossing signal; the main control module is used for controlling the load control module according to the power selection instruction so as to adjust the running power of the microwave generating circuit, determining the working time of the microwave generating circuit according to the zero-crossing signal, and controlling the load control module to be disconnected when the working time of the microwave generating circuit reaches the preset time so as to cut off the power supply of the microwave generating circuit, wherein the preset time is more than or equal to the timing time. This cooking equipment separates the power selection function from the timer through the control panel, the control panel passes through the power selection module and receives the power selection instruction, acquire user's culinary art power demand, and time according to the zero cross signal that zero cross detection module obtained, the culinary art precision has been improved, additionally, it is unusual to appear at the timer contact, the card situation of dying appears, when the condition that leads to reaching the timing time and the still continuous work of cooking utensil takes place, this host system can reach after predetermineeing the time confirming the continuous operating time of cooking equipment, through the power supply of control load control module automatic cutout microwave generating circuit, thereby play the guard action, effectively prevent the emergence of risk of catching fire.

In addition, the cooking device according to the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the invention, the control board further comprises a power module, an input end of the power module is connected with an output end of the timer, and the power module is used for converting a power supply accessed by the timer so as to output direct current to supply power to the main control module, the power selection module and the load control module.

According to one embodiment of the invention, the zero-crossing detection module is connected with the power supply module, and the zero-crossing detection module is used for detecting the voltage waveform converted by the power supply module based on the power supply so as to obtain the zero-crossing signal.

According to an embodiment of the present invention, the control board further includes a driving module, the driving module is connected between the load control module and the main control module, wherein the main control module is further configured to control the driving module to drive the load control module to be turned on or off according to the zero-crossing signal, so as to adjust the operating power of the microwave generating circuit.

According to one embodiment of the present invention, a driving module includes: one end of the first resistor is connected with the control output end of the main control module; one end of the first capacitor is connected with the other end of the first resistor; the anode of the first diode is connected with the other end of the first capacitor; the cathode of the second diode is connected with the other end of the first capacitor; the anode of the second capacitor is connected with the cathode of the first diode, and the cathode of the second capacitor is connected with the anode of the second diode; one end of the second resistor is connected with the cathode of the first diode, and the other end of the second resistor is connected with the anode of the second diode; the control end of the first switch tube is connected with one end of the second resistor, the first end of the first switch tube is connected with the other end of the second resistor and then grounded, and the second end of the first switch tube is connected with the control end of the load control module.

According to an embodiment of the present invention, the main control module outputs a PWM (Pulse Width Modulation) signal to the driving module through the control output terminal, so that the driving module drives the load control module to turn on or off according to a duty ratio of the PWM signal.

According to one embodiment of the invention, the power selection module comprises: the N voltage-dividing resistors are connected in series to form N-1 voltage-dividing nodes, wherein one end of a first voltage-dividing resistor in the N voltage-dividing resistors is connected with the input end of the main control module, and N is an integer greater than or equal to 2; one end of the third capacitor is connected with the other end of the first divider resistor, and the other end of the third capacitor is grounded; the third resistor is connected with the third capacitor in parallel; one end of each of the first to the (N-1) th selection switches is connected with the corresponding voltage division node, one end of the Nth selection switch is connected with the other end of the last voltage division resistor in the N voltage division resistors, and the other ends of the N selection switches are connected together and then connected with the output end of the power supply module.

According to an embodiment of the present invention, the control board further includes a door detection module, one end of the door detection module is connected to an output end of the power module in the control board, and the other end of the door detection module is respectively connected to a door detection end of the main control module and a low voltage power supply end of the load control module, and the door detection module is configured to provide the direct current output by the power module to the load control module when detecting that the door of the cooking apparatus is closed, and enable the main control module to detect a door closing signal.

According to one embodiment of the present invention, the load control module includes a relay, a switch contact of the relay is connected between the timer and the microwave generation circuit, and a coil of the relay is connected between the oven door detection module and the driving module.

According to one embodiment of the present invention, an oven door detection module includes: the detection switch, the fourth resistance, fourth electric capacity and fifth resistance, the one end of detection switch links to each other with power module's output, the other end of detection switch links to each other with the coil of relay, the one end of fourth resistance links to each other with the other end of detection switch, the other end ground connection of fourth resistance, fourth electric capacity and fourth resistance parallel connection, the one end of fifth resistance links to each other with the one end of fourth resistance, the other end of fifth resistance links to each other with host system's furnace gate sense terminal, wherein, detection switch is closed when the furnace gate is closed, and break off when the furnace gate is opened.

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

Fig. 1 is a block diagram of a cooking apparatus according to an embodiment of the present invention;

fig. 2 is a circuit topology diagram of a cooking apparatus according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A cooking apparatus according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Fig. 1 is a block diagram of a cooking apparatus according to an embodiment of the present invention.

Referring to fig. 1, a cooking apparatus according to an embodiment of the present invention may include a timer 10, a control board 20, and a microwave generating circuit 30, where the control board 20 includes a load control module 21, a power selection module 22, a zero-crossing detection module 23, and a main control module 24, an input end of the timer 10 is adapted to be connected to a power supply, an input end of the load control module 21 is connected to an output end of the timer 10, an output end of the load control module 21 is connected to the microwave generating circuit 30, and the main control module 24 is respectively connected to the load control module 21, the power selection module 22, and the zero-crossing detection module 23, where the power selection module 22 is configured to receive a power selection instruction. The timer 10 is used for timing the operating time of the microwave generating circuit 30 and disconnecting the power supply when the timing time is reached. The zero-crossing detection module 23 is configured to perform zero-crossing detection on the power supply accessed by the timer 10 to obtain a zero-crossing signal. The main control module 24 is configured to control the load control module 21 according to the power selection instruction to adjust the operating power of the microwave generation circuit 30, determine the operating time of the microwave generation circuit 30 according to the zero-crossing signal, and control the load control module 21 to turn off when the operating time of the microwave generation circuit 30 reaches a preset time to cut off the power supply of the microwave generation circuit 30, where the preset time is greater than or equal to the timing time.

Specifically, referring to fig. 1, an input end of the timer 10 is connected to a power supply, an output end of the timer is connected to an input end of the load control module 21, an output end of the load control module 21 is connected to the microwave generation circuit 30, and the power supply supplies power to the microwave generation circuit 30 through the timer 10 and the load control module 21, so as to form a power supply loop, so that a magnetron in the microwave generation circuit 30 operates to generate microwave energy.

The timer 10 is internally provided with a timing switch and a timing selection module, a user can input timing time through a knob on a control panel of the cooking device, and the timer 10 receives the timing time input by the user and takes the timing time as the working time of the microwave generating circuit 30 in the cooking working process, namely the working time of microwave energy generated by the magnetron. The initial state of the timer 10 is the off state of the timer switch, at this time, the power supply source cannot supply power to the microwave generating circuit 30 through the timer 10, and the power supply loop is in the off state. When the timer 10 receives the timing time and the start instruction through the timing selection module, the timing switch is controlled to be closed, timing operation is performed, the power supply is connected to the power supply loop and is output to the load control module 21 and the microwave generation circuit 30 through the timer 10, and when the load control module 21 is switched on, the microwave generation circuit 30 receives electric energy provided by the power supply, so that the magnetron is driven to perform microwave cooking operation. When the timing time of the timer 10 reaches the timing time, the timing switch is controlled to be turned off, at this time, the power supply no longer supplies power to the microwave generating circuit 30, and the magnetron stops working. It is understood that the above-mentioned manner of determining whether the timing time is reached by timing the timer 10 may be performed in a countdown manner, and when the timer 10 counts down to zero, the timing time is determined to be reached.

The power refers to the working power of the cooking device, i.e. the working power of the magnetron, and the user selects and adjusts the working power of the cooking device through the power selection module 22. For example, the user may select the operating power through a key of a control interface on the cooking device. The operating power of the cooking appliance selected by the user is used as a power selection command, and the power selection module 22 transmits the operating power of the cooking appliance selected by the user to the main control module 24. The main control module 24 controls the load control module 21 connected in series between the timer 10 and the microwave generating circuit 30 through the working power selected by the user, so as to adjust the input voltage input to the microwave generator 30, thereby achieving the purpose of adjusting the operating power in the microwave generating circuit 30 to meet the working power selected by the user.

The zero crossing point is the moment when the current of the alternating current output by the power supply is zero. The zero-crossing detection module 23 detects the zero-crossing point of the power supply and outputs a corresponding zero-crossing signal to the main control module 24, the main control module 24 determines the working time of the microwave generation circuit 30 according to the zero-crossing point of the power supply, the timing precision is improved, the purpose of accurate time control is achieved, the load control module 21 is controlled to be disconnected after the continuous working time of the microwave generation circuit 30 reaches the preset time, power supply for the microwave generation circuit 30 is stopped, and the microwave generation circuit 30 stops working.

The preset time can be preset and stored in the main control module 24 of the control board 20, and is used as the preset longest working time of the microwave generating circuit 30, and after the control board 20 determines that the continuous working time of the microwave generating circuit 30 reaches the preset time through timing operation, the load control module 21 is automatically controlled to be disconnected, so as to disconnect the power supply of the power supply to the microwave generating circuit 30. The preset time is longer than the time that can be received by the timer 10, at this time, even if the situation that the power supply source continuously supplies power to the microwave generating circuit 30 occurs after the time is reached due to the fact that the contact of the timing switch of the timer 10 is abnormal, because the control board 20 sets the longest working time of the cooking device, namely the preset time, when the cooking device is abnormal, the power supply source is disconnected from the microwave generating circuit 30 when the time is reached but the power supply is not stopped, and when the microwave generating circuit 30 continuously works, the control board 20 can control the load control module 21 to be disconnected through the main control module 24 after the lasting working time of the microwave generating circuit 30 reaches the preset longest working time, namely the preset time, so that the power supply source is disconnected from the microwave generating circuit 30, thereby achieving the protection effect and effectively preventing the occurrence of fire risks. For example, it is assumed that the preset time preset and stored in the main control board 20 is 30min, and the timing time selected by the user is 10min. When the user inputs a start control command, the timer 10 is closed and a timer operation is started. At this time, the main control module 24 controls the load control module 21 according to the received power selection command, the microwave generating circuit 30 performs the cooking operation according to the corresponding operating power, and simultaneously, the main control module 24 starts to time the operating time of the microwave generating circuit 30. When the timing time reaches 10min, if the timer 10 is abnormal, the timing switch cannot be disconnected, the power supply continuously supplies power to the microwave generating circuit 30, and the microwave generating circuit 30 continues to work. When the main control module 24 determines that the continuous working time of the microwave generating circuit 30 reaches 30min, the load control module 21 is controlled to be disconnected, so that the power supply is disconnected to supply power to the microwave generating circuit 30, and the microwave generating circuit 30 stops working. Therefore, the timer 10 in the cooking apparatus only serves as time selection, and when the switch contact of the timer 10 is abnormal, since the control board 20 sets the maximum working time, the control board 20 automatically disconnects the power supply circuit after the continuous working time of the cooking apparatus reaches the maximum working time, thereby playing a protective role.

It should be noted that the input end of the zero-crossing detection module 23 may be connected to the output end of the timer 10, and performs zero-crossing detection on the electrical signal output by the timer 10, or may be directly connected to a power supply, which is not limited herein. When the zero-cross detection module 23 is directly connected to the power supply, the main control module 24 may control the power-on operation of the zero-cross detection module 23 according to the start of the timer 10, or the main control module 24 may receive the zero-cross signal output by the second zero-cross detection module 23 after the timer 10 is started.

Referring to fig. 2, according to an embodiment of the present invention, the control board 20 further includes a power module 25, an input end of the power module 25 is connected to an output end of the timer 10, and the power module 25 is configured to convert a power supply accessed by the timer 10 to output a direct current to the main control module 24, the power selection module 22, and the load control module 21 for supplying power.

Specifically, as shown in fig. 2, the power supply outputs corresponding alternating current through L lines and N lines, the alternating current output from the power supply first performs a filtering operation through a filter 40, and then the filtered alternating current flows into the timer 10, wherein a timing switch of the timer 10 is connected in series on the L line.

The power module 25 includes a fuse RF1, a voltage-reducing module, a capacitor EC, and a voltage regulator Z1. The fuse tube RF1 is connected in series on an L line, one end of the fuse tube RF1 is connected with an L line output end of the timer, the other end of the fuse tube RF1 is connected with one end of the voltage reduction module, the other end of the voltage reduction module is connected with the anode of the capacitor EC, the cathode of the capacitor EC is connected with an N line output end of the timer 10, and the anode of the voltage regulator tube Z1 is grounded and connected with the cathode of the capacitor EC. The cathode of the voltage regulator tube Z1 is connected to the anode of the capacitor EC, and serves as the output terminal of the power module 25 to output the direct current VCC.

The voltage reducing module may be formed by resistors having a large series resistance, so as to reduce the voltage of the electrical signal output by the timer 10, and then output the direct current VCC through the single-phase conduction and voltage stabilizing of the zener diode. The dc power VCC is used to supply power to the main control module 24, the power selection module 22, and the load control module 21. That is, when the timer 10 is turned on, the ac power output by the power supply flows into the power module 25, and the ac power output by the power supply is rectified to the dc power VCC after being filtered by the filter 40 and subjected to the voltage reduction operation in the power module 25, so as to power the main control module 24, the power selection module 22, and the load control module 21, and power the control board 20. Then, the main control module 24 controls the load control module 21 according to the received power selection command to adjust the operation power of the microwave generating circuit 30.

The cooking device will be described in detail below by taking an example that the timer 10 is in a closed state, the power module 25 converts a power supply accessed by the timer 10, and outputs a direct current VCC to supply power to the main control module 24, the power selection module 22 and the load control module 21, and the control board 20 is in a power-on state.

According to an embodiment of the present invention, the zero-crossing detection module 23 is connected to the power module 25, and the zero-crossing detection module 23 detects a voltage waveform converted by the power module 25 based on the power supply to obtain the zero-crossing signal.

With continued reference to fig. 2, the zero-crossing detection module 23 is formed by connecting three resistors in series, an input end of the zero-crossing detection module 23 is connected to an output end of the power module 25, and an output end of the zero-crossing detection module 23 is connected to an input end of the main control module 24. That is, the zero-crossing detection module 23 performs zero-crossing detection on the direct current VCC output by the power module 25, so as to generate a zero-crossing signal and send the zero-crossing signal to the main control module 24. It can be understood that when the dc voltage VCC is equal to 0, the zero-crossing detection module 23 outputs a low level to the main control module 24 when the zero-crossing point of the power supply is set.

According to an embodiment of the present invention, the control board 20 further includes a driving module 26, the driving module 26 is connected between the load control module 21 and the main control module 24, wherein the main control module 24 is further configured to control the driving module 26 to drive the load control module 21 to be turned on or off according to the zero-crossing signal, so as to adjust the operating power of the microwave generating circuit 30.

Specifically, after the timer 10 is turned on and the power module 25 outputs the direct current VCC, the main control board 20 is powered on, and the zero-crossing detection module 23 performs zero-crossing detection on the direct current VCC and sends a corresponding zero-crossing signal to the main control module 24. The main control module 24 determines a zero crossing point of the alternating current provided by the power supply according to the zero crossing signal, so as to determine a peak value of the alternating current, and controls the driving module 26 to enable the load control module 21 to be conducted at the peak value of the alternating current, so that the impact current is minimum when the load control module 21 is conducted and closed.

According to one embodiment of the invention, the drive module 26 comprises: one end of the first resistor R1 is connected with the control output end of the main control module 24; one end of the first capacitor C1 is connected with the other end of the first resistor R1; the anode of the first diode D1 is connected with the other end of the first capacitor C1; a cathode of the second diode D2 is connected to the other end of the first capacitor C1; the anode of the second capacitor C2 is connected with the cathode of the first diode D1, and the cathode of the second capacitor C2 is connected with the anode of the second diode D2; one end of the second resistor R2 is connected with the cathode of the first diode D1, and the other end of the second resistor R2 is connected with the anode of the second diode D2; the control end of the first switch tube Q1 is connected with one end of the second resistor R2, the first end of the first switch tube Q1 is connected with the other end of the second resistor R2 and then grounded, and the second end of the first switch tube Q1 is connected with the control end of the load control module 21.

According to an embodiment of the present invention, the main control module 24 outputs a PWM signal to the driving module 26 through the control output terminal, so that the driving module 26 drives the load control module 21 to turn on or off according to the duty ratio of the PWM signal.

Specifically, through the dc blocking and ac blocking characteristic of the first capacitor C1, the control end of the main control module 24 outputs a PWM signal to control the conduction of the first switching tube Q1, so as to control the conduction and the shutdown of the load control module 21. The technical scheme that the main control module 24 outputs the PWM signal to drive and control the driving module 26 can effectively prevent the load control module 21 from being continuously in the closed working condition when the main control module 24 is halted and abnormal and the control end of the main control module 24 continuously outputs a level. Specifically, when the control end of the master control module 24 outputs the RWM signal, if the master control module 24 is halted or abnormal, the control end continuously outputs a level signal, so that it can be confirmed that the master control module 24 has a fault. In addition, under the action of the first capacitor C1, a level signal which is continuously output cannot be output to the first switching tube Q1, at this time, the first switching tube Q1 is turned off, and the driving signal is no longer output to the load control module 21, so that, in this embodiment, when the control end of the main control module 24 continuously outputs a level signal, the driving module 26 cannot drive the load control module 21 to work, thereby improving the safety of the cooking device.

It should be noted that the load control module 21 may be configured with a normally open switch connected in series to the power supply circuit, and the normally closed switch is controlled to be closed or opened to implement the connection or disconnection of the power supply circuit. When the driving module 26 does not output the driving signal to the load control module 21, the normally open switch is in an open state, the power supply loop is in an open circuit, and the microwave generating circuit 30 does not operate. When the driving module 26 outputs a driving signal to the load control module 21, the normally open switch is in a closed state, the power supply loop is turned on, and the power supply supplies power to the microwave generating circuit 30.

Further, referring to fig. 2, an output terminal of the load control module 21 is connected to an input terminal of a transformer 31 in the microwave generating circuit 30, and an output terminal of the transformer 31 is connected to a magnetron boosting module 32, wherein the transformer 31 performs voltage conversion on an input voltage at the input terminal and outputs the converted voltage to the magnetron boosting module 32 through the output terminal, and the magnetron boosting module 32 boosts an output voltage of the transformer 31 and then drives a magnetron, thereby generating microwaves and performing a cooking operation. In the driving control process, the control end of the main control module 24 outputs a PWM signal with a certain duty ratio to control the on/off of the first switching tube Q1, the second end of the first switching tube Q1 outputs a driving control signal to the control end of the load control module 21, the load control module 21 controls the on/off of the load control module 21 according to the driving control signal, and the input voltage of the transformer 31 is adjusted by controlling the on/off time of the load control module 21, so as to achieve the purpose of changing the working power. That is to say, the PWM signal output by the main control module 24 controls the on/off time of the first switch tube Q1, so as to generate a driving control signal with a certain duty ratio to control the load control module 21, and the input voltage of the microwave generating circuit 30 is adjusted by the duty ratio of the driving control signal, so as to adjust the working power of the microwave generating circuit 30.

According to one embodiment of the invention, the power selection module 22 comprises: the N voltage-dividing resistors are connected in series to form N-1 voltage-dividing nodes, wherein one end of a first voltage-dividing resistor in the N voltage-dividing resistors is connected with the input end of the main control module 24, and N is an integer greater than or equal to 2; one end of the third capacitor C3 is connected with the other end of the first divider resistor, and the other end of the third capacitor C3 is grounded; the third resistor R3, the third resistor R3 and the third capacitor C3 are connected in parallel; and one end of each of the first to (N-1) th selection switches is connected with the corresponding voltage division node, one end of the Nth selection switch is connected with the other end of the last voltage division resistor in the N voltage division resistors, and the other ends of the N selection switches are connected together and then connected with the output end of the power module 25.

Specifically, continuing with fig. 2 as an example, the power selection module 22 includes 5 voltage-dividing resistors and 5 selection switches, the 5 voltage-dividing resistors are represented by voltage-dividing resistor r1, voltage-dividing resistor r2, voltage-dividing resistor r3, voltage-dividing resistor r4, and voltage-dividing resistor r5, and the 5 selection switches are represented by selection switch k1, selection switch k2, selection switch k3, selection switch k4, and selection switch k5, respectively. One end of the divider resistor r1 is connected to the input end of the main control module 24, and the other end of the divider resistor r1 is connected to one end of the divider resistor r2, so as to form a divider node a. The other end of the divider resistor r2 is connected to one end of the divider resistor r3 to form a voltage dividing node b. The other end of the divider resistor r3 is connected with one end of the divider resistor r4 to form a divider node c. The other end of the divider resistor r4 is connected with one end of the divider resistor r5 to form a divider node d. And the third capacitor C3 is connected with the third resistor R3 in parallel to form a filtering module, one end of the filtering module is connected between the other end of the voltage dividing resistor R1 and the voltage dividing node a, and the other end of the filtering module is grounded. One end of the selector switch k1 is connected with the voltage dividing node a, one end of the selector switch k2 is connected with the voltage dividing node b, one end of the selector switch k3 is connected with the voltage dividing node c, one end of the selector switch k4 is connected with the voltage dividing node d, one end of the selector switch k5 is connected with the other end of the voltage dividing resistor r5, and the other ends of the selector switch k1, the selector switch k2, the selector switch k3, the selector switch k4 and the selector switch k5 are connected with the output end of the power module 25, namely, the direct current VCC is connected.

The selection switch k1, the selection switch k2, the selection switch k3, the selection switch k4 and the selection switch k5 correspond to different power selection keys respectively, for example, the selection switch k1 corresponds to a power 30% key, the selection switch k2 corresponds to a power 50% key, the selection switch k3 corresponds to a power 70% key, the selection switch k4 corresponds to a power 90% key, the selection switch k5 corresponds to a power 100% key, and the main control module 24 prestores a corresponding relationship table of an electric signal received by an input end and working power. When the user selects the power 70% key, the selection switch k3 is pressed, and the direct current VCC flows into the input end of the main control module 24 through the selection switch k3, the voltage dividing resistor r2 and the voltage dividing resistor r 1. When the user selects the power 50% key, the selection switch k2 is pressed, and the direct current VCC flows into the input end of the main control module 24 through the selection switch k2, the voltage dividing resistor r2 and the voltage dividing resistor r 1. Therefore, the main control module 24 determines the power selection instruction input by the user according to the received electrical signal and the call of the pre-stored electrical signal-working power correspondence table, so as to output a corresponding PWM signal to control the load control module 21 through the driving module 26. In this embodiment, the resistance value of the input terminal of the main control module 24 is changed to be converted into a corresponding voltage value, so as to achieve the purpose of detecting the user requirement and determining the power selection instruction.

According to an embodiment of the present invention, the control board 20 further includes an oven door detection module 27, one end of the oven door detection module 27 is connected to the output end of the power module 25 in the control board 20, the other end of the oven door detection module 27 is respectively connected to the oven door detection end of the main control module 24 and the low voltage power supply end of the load control module 21, and the oven door detection module 27 is configured to provide the direct current output by the power module 24 to the load control module 20 when detecting that the oven door of the cooking apparatus is closed, and enable the main control module 24 to detect an oven door closing signal.

Specifically, one end of the oven door detection module 27 is connected to the output end of the power module 25, that is, receives the direct current VCC output by the output end of the power module 25. When the oven door detection module 27 detects that the oven door of the cooking device is closed, the oven door detection module 27 is closed and conducted, and the direct current VCC is connected with the oven door detection end of the main control module 24 and the low-voltage power supply end of the load control module 21 through the oven door detection side module 27. When the direct current VCC passes through the furnace door detection side module 27 and the low-voltage power supply end of the load control module 21, the load control module 21 is powered on and in a drivable state, and can be controlled to be on and off according to a control end output signal of the main control module 24. When the direct current VCC is connected to the door detection end of the main control module 24 through the door detection side module 27, the door detection end of the main control module 24 is at a high level, and it is determined that a door closing signal is detected, so that the on/off of the load control module 21 is controlled through the driving module 26 according to the received user power selection instruction.

When the oven door detection module 27 does not detect that the oven door of the cooking device is closed, the oven door detection module 27 is in a disconnected state, the oven door detection end of the main control module 24 is at a low level, and an oven door closing signal is not detected. Meanwhile, the low-voltage power supply terminal of the load control module 21 is not powered on, and at this time, the load control module 21 does not work and is in a disconnected state. It should be noted that the load control module 21 may select a normally open switch, so as to ensure that the load control module 21 is in a disconnected state when not operating, and further ensure the electrical safety.

According to one embodiment of the present invention, the load control module 21 includes a relay, the switch contacts of which are connected between the timer 20 and the microwave generating circuit 30, and the coil of which is connected between the oven door detection module 27 and the driving module 26.

With continued reference to fig. 2, the switch contact 1 of the relay in the load control module 21 is connected to the output terminal of the timer 10, the switch contact 2 is connected to the input terminal of the transformer 31, one end contact 3 of the coil of the relay serves as the low-voltage upper voltage terminal of the load control module 21 and is connected to the output terminal of the oven door detection module 27, and the other end contact 4 of the coil is connected to the output terminal of the driving module 26. The relay is a normally open relay. When the oven door detection module 27 detects that the oven door is closed, the oven door detection module 27 is closed, one end of a coil of the relay is connected with the direct current VCC, and the current in the coil is controlled by controlling the output signal of the driving module 26, so that the suction or the opening of a switch of the relay is controlled, the on-off of the load control module 21 is controlled, and the input voltage of the microwave generating circuit 30 is adjusted. Thus, in this embodiment, the oven door detection module 27 is in series with the drive module 24, thereby providing a double protection for the safety of the cooking device.

According to one embodiment of the present invention, the oven door detection module 27 comprises: the detection device comprises a detection switch DOOR1, a fourth resistor R4, a fourth capacitor C4 and a fifth resistor R5, wherein one end of the detection switch DOOR1 is connected with the output end of the power module 25, the other end of the detection switch DOOR1 is connected with a coil of the relay, one end of the fourth resistor R4 is connected with the other end of the detection switch DOOR1, the other end of the fourth resistor R4 is grounded, the fourth capacitor C4 is connected with the fourth resistor R4 in parallel, one end of the fifth resistor R5 is connected with one end of the fourth resistor R4, the other end of the fifth resistor R5 is connected with the detection end of the oven DOOR of the main control module 24, and the detection switch DOOR1 is closed when the oven DOOR is closed and is opened when the oven DOOR is opened.

Specifically, the opening and closing state of the oven DOOR is detected in real time by the detection switch DOOR 1. When the furnace DOOR is closed, the detection switch DOOR1 is closed, and the direct current VCC is connected with one end contact 3 of the coil through the closed detection switch DOOR1, so that the low-voltage upper end of the load control module 21 is electrified. A filter unit formed by a fourth resistor R4 and a fourth capacitor C4 and a fifth resistor R5 are output through a closed detection switch DOOR1 by a direct current VCC and then input to the oven DOOR detection end of the main control module 24, the oven DOOR detection end of the main control module 24 is at a high level, it is determined that an oven DOOR closing signal is detected, and a PWM signal is output to control the driving module 26.

When the oven DOOR is opened, the detection switch DOOR1 is opened, the low-voltage power-on end of the load control module 21 is powered off, and the load control module 21 does not work. Meanwhile, the detection end of the main control module 24 is at a low level, it is determined that the oven door closing signal is not detected, and the main control module 24 does not output a PWM signal to control the driving module 26. In addition, when the oven door is opened, even if the main control module 24 outputs a control signal to the contact 4 at the other end of the coil through the driving module 26, the switch of the relay cannot be triggered and controlled, so that the mechanical protection effect is realized through the oven door detection module 27, the cooking equipment is prevented from working after the oven door is opened, and the safety of a user is protected.

Further, the cooking device can realize triple protection based on the above embodiment: 1. the maximum working time of the cooking equipment is determined by the built-in preset time of the main control board 20, so that when the contact of the timer 10 is abnormal, the connection between the microwave generating circuit 30 and the power supply can be automatically disconnected after the continuous working time of the cooking equipment reaches the preset time; 2. the load control module 21 is driven by the PWM signal output by the main control module 24, so that the continuous working condition of the load control module 21 is avoided when the main control module 24 is abnormal or crashed; 3. the state of the oven door of the cooking device is detected by the oven door detection module 27, so that the cooking device is prevented from working when the oven door of the cooking device is opened, and the safety of a user is protected. From this, this cooking equipment has solved security problems such as microwave equipment is on fire, avoids user and company's loss of property, has reduced the application cost simultaneously, has promoted work efficiency to based on zero cross detection module 23 has improved and has boiled the edible time precision.

In summary, a cooking apparatus according to an embodiment of the present invention includes: the microwave power generation device comprises a timer, a control panel and a microwave generation circuit, wherein the control panel comprises a load control module, a power selection module, a zero-crossing detection module and a main control module, the input end of the timer is suitable for being connected with a power supply, the input end of the load control module is connected with the output end of the timer, the output end of the load control module is connected with the microwave generation circuit, the main control module is respectively connected with the load control module, the power selection module and the zero-crossing detection module, and the power selection module is used for receiving a power selection instruction; the timer is used for timing the working time of the microwave generating circuit and disconnecting the power supply when the timing time is up; the zero-crossing detection module is used for carrying out zero-crossing detection on a power supply accessed by the timer to obtain a zero-crossing signal; the main control module is used for controlling the load control module according to the power selection instruction so as to adjust the running power of the microwave generating circuit, determining the working time of the microwave generating circuit according to the zero-crossing signal, and controlling the load control module to be disconnected when the working time of the microwave generating circuit reaches the preset time so as to cut off the power supply of the microwave generating circuit, wherein the preset time is more than or equal to the timing time. This cooking equipment separates the power selection function from the timer through the control panel, the control panel passes through the power selection module and receives the power selection instruction, acquire user's cooking power demand, and time according to the zero passage signal that zero passage detection module obtained, the culinary art precision has been improved, in addition, it is unusual to appear in the timer contact, the card condition of dying appears, when the condition that leads to reaching the timing time and cooking utensil still continuous work takes place, this host system can be after confirming cooking equipment's continuous operating time reaches the preset time, through the power supply of control load control module automatic cutout microwave generating circuit, thereby play the guard action, effectively prevent the emergence of risk of catching fire.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means 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 invention. In this specification, the schematic representations of the terms used above 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.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second", and the like used in the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated in the embodiments. Therefore, the feature of the embodiments of the present invention defined by the terms "first", "second", etc. may explicitly or implicitly indicate that at least one of the feature is included in the embodiments. In the description of the present invention, the word "plurality" means at least two or two and more, such as two, three, four, etc., unless specifically limited otherwise in the examples.

In the present invention, unless otherwise explicitly stated or limited by the relevant description or limitation, the terms "mounted," "connected," and "fixed" in the embodiments are to be understood in a broad sense, for example, the connection may be a fixed connection, a detachable connection, or an integrated connection, and it may be understood that the connection may also be a mechanical connection, an electrical connection, etc.; of course, they may be directly connected or indirectly connected through intervening media, or they may be interconnected within one another or in an interactive relationship. Those of ordinary skill in the art will understand the specific meaning of the above terms in the present invention according to their specific implementation.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A cooking apparatus, comprising: the microwave oven comprises a timer, a control panel and a microwave generating circuit, wherein the control panel comprises a load control module, a power selection module, a zero-crossing detection module and a main control module, the input end of the timer is suitable for being connected with a power supply, the input end of the load control module is connected with the output end of the timer, the output end of the load control module is connected with the microwave generating circuit, the main control module is respectively connected with the load control module, the power selection module and the zero-crossing detection module, wherein,

the power selection module is used for receiving a power selection instruction;

the timer is used for timing the working time of the microwave generating circuit and disconnecting the power supply from the power supply when the timing time is up;

the zero-crossing detection module is used for carrying out zero-crossing detection on a power supply accessed by the timer to obtain a zero-crossing signal;

the main control module is used for controlling the load control module according to the power selection instruction so as to adjust the running power of the microwave generation circuit, determining the working time of the microwave generation circuit according to the zero-crossing signal, and controlling the load control module to be disconnected when the working time of the microwave generation circuit reaches a preset time so as to cut off the power supply of the microwave generation circuit, wherein the preset time is more than or equal to the timing time.

2. The cooking apparatus according to claim 1, wherein the control board further comprises a power module, an input end of the power module is connected to an output end of the timer, and the power module is configured to convert a power supply accessed by the timer to output a direct current to power the main control module, the power selection module and the load control module.

3. The cooking apparatus according to claim 2, wherein the zero crossing detection module is connected to the power supply module, and the zero crossing detection module obtains the zero crossing signal by detecting a voltage waveform transformed by the power supply module based on the power supply.

4. The cooking apparatus according to any one of claims 1 to 3, wherein the control board further comprises a driving module, the driving module is connected between the load control module and the main control module, wherein the main control module is further configured to control the driving module to drive the load control module to be switched on and off according to the zero-crossing signal, so as to adjust the operating power of the microwave generating circuit.

5. The cooking apparatus of claim 4, wherein the driving module comprises:

one end of the first resistor is connected with the control output end of the main control module;

one end of the first capacitor is connected with the other end of the first resistor;

the anode of the first diode is connected with the other end of the first capacitor;

the cathode of the second diode is connected with the other end of the first capacitor;

the anode of the second capacitor is connected with the cathode of the first diode, and the cathode of the second capacitor is connected with the anode of the second diode;

one end of the second resistor is connected with the cathode of the first diode, and the other end of the second resistor is connected with the anode of the second diode;

the control end of the first switch tube is connected with one end of the second resistor, the first end of the first switch tube is connected with the other end of the second resistor and then grounded, and the second end of the first switch tube is connected with the control end of the load control module.

6. The cooking apparatus according to claim 5, wherein the main control module outputs a PWM signal to the driving module through the control output terminal, so that the driving module drives the load control module to be turned on or off according to a duty ratio of the PWM signal.

7. The cooking apparatus of claim 2, wherein the power selection module comprises:

the N voltage-dividing resistors are connected in series to form N-1 voltage-dividing nodes, wherein one end of a first voltage-dividing resistor in the N voltage-dividing resistors is connected with the input end of the main control module, and N is an integer greater than or equal to 2;

one end of the third capacitor is connected with the other end of the first divider resistor, and the other end of the third capacitor is grounded;

a third resistor connected in parallel with the third capacitor;

the N selection switches are connected with one ends of first to N-1 selection switches in the N selection switches and corresponding voltage division nodes, one end of the Nth selection switch is connected with the other end of the last voltage division resistor in the N voltage division resistors, and the other ends of the N selection switches are connected together and then connected with the output end of the power supply module.

8. The cooking apparatus according to claim 4, wherein the control board further comprises an oven door detection module, one end of the oven door detection module is connected to an output end of a power module in the control board, and the other end of the oven door detection module is connected to an oven door detection end of the main control module and a low voltage power supply end of the load control module, respectively, and the oven door detection module is configured to provide the direct current output by the power module to the load control module when detecting that the oven door of the cooking apparatus is closed, and enable the main control module to detect an oven door closing signal.

9. The cooking apparatus of claim 8, wherein the load control module includes a relay having a switch contact connected between the timer and the microwave generating circuit, and a coil connected between the oven door detection module and the drive module.

10. The cooking apparatus according to claim 9, wherein the oven door detection module comprises: the detection switch, the fourth resistance, the fourth electric capacity and the fifth resistance, the one end of detection switch with power module's output links to each other, the other end of detection switch with the coil of relay links to each other, the one end of fourth resistance with the other end of detection switch links to each other, the other end ground connection of fourth resistance, the fourth electric capacity with fourth resistance parallel connection, the one end of fifth resistance with the one end of fourth resistance links to each other, the other end of fifth resistance with main control module's furnace gate sense terminal links to each other, wherein, detection switch is in it is closed when the furnace gate is closed, and the disconnection when the furnace gate is opened.

Images