Microwave heating equipment, control method thereof, power supply circuit and computer storage medium

Abstract

The invention provides a control method of microwave heating equipment, a power supply circuit, the microwave heating equipment and a computer storage medium. The microwave heating equipment is provided with a power supply circuit, the power supply circuit comprises a rectifying circuit, an inverter switch and a voltage transformation circuit electrically connected with the rectifying circuit and the inverter switch, and the control method comprises the steps that the power adjusting requirement is obtained; controlling the voltage transformation circuit to work in a voltage reduction mode and adjusting a first control parameter of the inverter switch in response to the condition that the power regulation requirement is power reduction, so as to reduce the actual heating power of the microwave heating equipment to the target heating power; and controlling the voltage transformation circuit to work in a boost mode and adjusting a first control parameter of the inverter switch in response to the condition that the power adjustment demand is power boost, so as to adjust the actual heating power of the microwave heating equipment to the target heating power. According to the control method of the microwave heating equipment, the heating power range of the microwave heating equipment can be widened, and accurate adjustment of the heating power is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a control method for a microwave heating device, a power supply circuit, a microwave heating device and a computer storage medium. Background Art

[0002] As a high-power heating device, microwave heating equipment can achieve rapid heating, which is convenient and quick. However, the existing microwave heating equipment, such as microwave ovens, has a narrow heating power adjustment range. Summary of the invention

[0003] The present application provides a control method for a microwave heating device, a power supply circuit, a microwave heating device and a computer storage medium to solve the technical problems of a narrow heating power range and low power regulation accuracy of the microwave heating device.

[0004] To solve the above technical problems, the present application provides a control method for a microwave heating device, wherein the microwave heating device is provided with a power supply circuit, the power supply circuit comprising a rectifier circuit, an inverter switch and a transformer circuit electrically connected to the rectifier circuit and the inverter switch, and the control method comprises obtaining a power regulation demand; in response to the power regulation demand being a power reduction, controlling the transformer circuit to operate in a step-down mode, and adjusting a first control parameter of the inverter switch to reduce the actual heating power of the microwave heating device to a target heating power; in response to the power regulation demand being a power increase, controlling the transformer circuit to operate in a step-up mode, and adjusting the first control parameter of the inverter switch to adjust the actual heating power of the microwave heating device to the target heating power.

[0005] In one embodiment, the control method further comprises determining a power adjustment requirement based on a difference between the target heating power and the preset power.

[0006] In one embodiment, the transformer circuit includes a first switch tube, a first inductor, and a second switch tube. The first end and the second end of the first switch tube are respectively connected to the rectifier circuit and one end of the first inductor, and the first end and the second end of the second switch tube are respectively connected to the other end of the first inductor, the inverter switch, and the rectifier circuit. The transformer circuit is controlled to operate in a boost mode and a first control parameter of the inverter switch is adjusted, including controlling the first switch tube to be turned on and adjusting the second control parameter of the second switch tube to control the transformer circuit to operate in a boost mode; adjusting the first control parameter of the inverter switch; wherein the first control parameter includes the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal; the second control parameter includes the driving frequency of the second switch tube or the duty cycle of the pulse width modulation signal.

[0007] In one embodiment, the transformer circuit includes a first switch tube, a first inductor, and a second switch tube. The first end and the second end of the first switch tube are respectively connected to the rectifier circuit and one end of the first inductor, and the first end and the second end of the second switch tube are respectively connected to the other end of the first inductor, the inverter switch, and the rectifier circuit. The transformer circuit is controlled to operate in a buck mode, and the first control parameter of the inverter switch is adjusted, including adjusting the third control parameter of the first switch tube, and controlling the second switch tube to be cut off to control the transformer circuit to operate in the buck mode; adjusting the first control parameter of the inverter switch; wherein the first control parameter includes the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal; the third control parameter includes the driving frequency of the first switch tube or the duty cycle of the pulse width modulation signal.

[0008] In one embodiment, the preset power ranges from 500W to 1000W.

[0009] In order to solve the above technical problems, the present application provides a power supply circuit for a microwave heating device, the microwave heating device comprising a control circuit and a power supply circuit electrically connected to the control circuit, the power supply circuit comprising a rectifier circuit, a transformer circuit and an inverter switch, the transformer circuit is electrically connected to the rectifier circuit and the microwave generating circuit of the microwave heating device; the inverter switch is electrically connected to the rectifier circuit and the microwave generating circuit; the transformer circuit and the inverter switch are electrically connected to the control circuit, so that the control circuit adopts the above control method to control the operation of the transformer circuit and the inverter switch, thereby controlling the heating power of the microwave generating circuit.

[0010] In one embodiment, the transformer circuit includes a first switch tube, a first inductor and a second switch tube, wherein the first end of the first switch tube is electrically connected to the rectifier circuit, and the control end of the first switch tube is connected to the control circuit; one end of the first inductor is electrically connected to the second end of the first switch tube; the first end of the second switch tube is electrically connected to the other end of the first inductor and the microwave generating circuit, the second end of the second switch tube is grounded, and the control end of the second switch tube is electrically connected to the control circuit; wherein, when the transformer circuit operates in a step-down mode, the first switch tube operates with a third control parameter, and the second switch tube is cut off; when the transformer circuit operates in a step-up mode, the first switch tube is turned on, and the second switch tube is turned on with a second control parameter.

[0011] In one embodiment, the transformer circuit also includes a first diode and a second diode, the anode of the first diode is grounded, and the cathode of the first diode is electrically connected to the first end of the first switching tube and one end of the first inductor; the anode of the second diode is electrically connected to the other end of the first inductor and the first end of the second switching tube, and the cathode of the second diode is electrically connected to the microwave generating circuit.

[0012] In one embodiment, the voltage conversion circuit further includes a filter capacitor, one end of the filter capacitor is electrically connected to the cathode of the second diode, and the other end of the filter capacitor is grounded.

[0013] In order to solve the above technical problems, the present application provides a microwave heating device, which includes the above-mentioned power supply circuit, control circuit and microwave generating circuit, the microwave generating circuit is electrically connected to the transformer circuit and the inverter switch respectively, and the control circuit adopts the above-mentioned control method to control the operation of the transformer circuit and the inverter switch to control the heating power of the microwave generating circuit.

[0014] In order to solve the above technical problems, the present application provides a computer storage medium, which stores computer program instructions, and the computer program instructions can be executed by a processor to execute the above control method.

[0015] The beneficial effects of the present application are as follows: the control method of the present application obtains the power regulation demand, and controls the transformer circuit to operate in the buck mode or the boost mode based on the power regulation demand, so as to realize the primary regulation of the heating power of the microwave heating device by adjusting the bus voltage of the power supply circuit, and realize the secondary regulation of the heating power of the microwave heating device by adjusting the first control parameter of the inverter switch, so as to adjust the actual heating power of the microwave heating device to the target heating power. That is, the control method of the present application can realize the two-stage power regulation of the microwave heating device, and by controlling the transformer circuit to operate in the buck mode or the boost mode, or adjusting the first control parameter of the inverter switch, it can improve the problem that the heating power range is too small due to the limited regulation range of one or two factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a microwave heating device provided by the present application;

[0018] Figure 2 is a circuit diagram of an embodiment of a microwave heating device provided by the present application;

[0019] Figure 3 It is a flow chart of an embodiment of a control method for a microwave heating device provided by the present application;

[0020] Figure 4 yes Figure 3 Implementation step S200 is a flow chart of an implementation example;

[0021] Figure 5 yes Figure 3Schematic diagram of the process of step S300 of an embodiment;

[0022] Figure 6 It is a structural diagram of an embodiment of a computer storage medium provided by the present application. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0026] The present application provides a microwave heating device, referring to Figure 1 , Figure 1 1 is a schematic diagram of the structure of an embodiment of a microwave heating device provided by the present application, wherein the microwave heating device 10 comprises a body 300, a power supply circuit 100, a microwave generating circuit 200 and a control circuit 400, wherein the power supply circuit 100 is electrically connected to the control circuit 400 and the microwave generating circuit 200 respectively, and the power supply circuit 100, the control circuit 400 and the microwave generating circuit 200 are arranged in the body 300. The control circuit 400 controls the heating power of the microwave generating circuit 200 by controlling the power supply circuit 100 to work, thereby controlling the heating power of the microwave heating device 10.

[0027] Among them, the microwave heating device 10 can include microwave ovens, microwave steam ovens, microwave fryers, microwave rice steamers, microwave heating stoves and other microwave heating devices, which are not limited here.

[0028] In one embodiment, see Figure 2 , Figure 2 1 is a circuit diagram of an embodiment of a microwave heating device provided by the present application, wherein the power supply circuit 100 includes a rectifier circuit 110, a transformer circuit 120 and an inverter switch 130. The rectifier circuit 110 receives an AC signal for converting the AC signal into a DC signal. The transformer circuit 120 is electrically connected to the rectifier circuit 110, the inverter switch 130 and the microwave generating circuit 200, respectively, and the control circuit 400 is electrically connected to the transformer circuit 120 and the inverter switch 130, respectively. The control circuit 400 can adjust the bus voltage of the power supply circuit 100 by controlling the transformer circuit 120 and the inverter switch 130 to adjust the power of the microwave generating circuit 200, thereby adjusting the heating power of the microwave heating device 10.

[0029] In one embodiment, the voltage conversion circuit 120 includes a first switch tube Q1, a first inductor L1, and a second switch tube Q2. The first end of the first switch tube Q1 is electrically connected to the rectifier circuit 110, the control end of the first switch tube Q1 is electrically connected to the control circuit 400, and the second end of the first switch tube Q1 is electrically connected to one end of the first inductor L1. The other end of the first inductor L1 is electrically connected to the first end of the second switch tube Q2 and the microwave generating circuit 200, respectively, the control end of the second switch tube Q2 is electrically connected to the control circuit 400, and the second end of the second switch tube Q2 is grounded. When the voltage conversion circuit 120 works in the step-down mode, the first switch tube Q1 is in the working state with the third control parameter, and the second switch tube Q2 is in the cut-off state, so that the voltage conversion circuit 120 works in the step-down mode. When the voltage conversion circuit 120 works in the step-down mode, the voltage output by the voltage conversion circuit 120 is less than the voltage output by the rectifier circuit 110, thereby being able to reduce the bus voltage of the power supply circuit 100. Furthermore, by adjusting the third control parameter, such as the driving frequency of the first switch tube Q1, or the duty cycle of the pulse width modulation signal, or the driving frequency and the duty cycle of the pulse width modulation signal, the output voltage of the transformer circuit 120 can be adjusted, that is, the bus voltage of the power supply circuit 100 can be adjusted. The transformer circuit 120 operates in the boost mode, the first switch tube Q1 is in the on state, at this time the first switch tube Q1 is equivalent to the wire, and the second switch tube Q2 is in the working state with the second control parameter, so that the transformer circuit 120 operates in the boost mode. Among them, when the transformer circuit 120 operates in the boost mode, the voltage output by the transformer circuit 120 is greater than or equal to the voltage output by the rectifier circuit 110, so that the bus voltage of the power supply circuit 100 can be increased. Furthermore, by adjusting the second control parameter, such as the driving frequency of the second switch tube Q2, or the duty cycle of the pulse width modulation signal, or the driving frequency and the duty cycle of the pulse width modulation signal, the output voltage of the transformer circuit 120 can be adjusted, that is, the bus voltage of the power supply circuit 100 can be adjusted.

[0030] It is worth noting that the power supply circuit 100 can further adjust the bus voltage of the power supply circuit 100 by adjusting the first control parameter of the inverter switch 130 .

[0031] In one embodiment, the voltage conversion circuit 120 further includes a filter capacitor C1, one end of the filter capacitor C1 is electrically connected to the first end of the second switch tube Q2 and the microwave generating circuit 200, and the other end of the filter capacitor C1 is grounded. In this embodiment, the filter capacitor C1 is provided to filter out the 50 Hz power frequency signal, thereby reducing the interference of the power frequency signal on the microwave generating circuit 200, so that the microwave generating circuit 200 generates heat evenly.

[0032] In one embodiment, the voltage conversion circuit 120 further includes a first diode D1 and a second diode D2. The anode of the first diode D1 is grounded, and the cathode of the first diode D1 is electrically connected to the first end of the first switch tube Q1 and one end of the first inductor L1. The anode of the second diode D2 is electrically connected to the other end of the first inductor L1 and the first end of the second switch tube Q2, and the cathode of the second diode D2 is electrically connected to the microwave generating circuit 200 and one end of the filter capacitor C1.

[0033] In one embodiment, the rectifier circuit 110 includes a rectifier bridge (not marked in the figure) composed of two diodes (not marked in the figure) and two controllable tubes (not marked in the figure). Among them, the two diodes constitute one bridge arm of the rectifier bridge, and the two controllable tubes constitute the other bridge arm of the rectifier bridge; or, the bridge arm is composed of a diode and a controllable tube. In other embodiments, the rectifier circuit 110 may also include a rectifier bridge composed of three diodes and a controllable tube, or a rectifier bridge composed of four controllable tubes, or the rectifier bridge may include four diodes, which is not limited here. When the rectifier bridge includes a controllable tube, the control end of the controllable tube is connected to the control circuit 400, and the control circuit 400 can adjust the conduction time of the rectifier bridge through the controllable tube. Among them, the microwave heating device 10 can reduce the output voltage of the power supply circuit 100 by adjusting the conduction time of the rectifier bridge, and can further adjust the heating power of the microwave heating device 10.

[0034] In other embodiments, the rectifier circuit 110 may further include a bidirectional conductive controllable transistor (marked in the figure), which can realize the rectifier function of the rectifier full bridge. The rectifier circuit 110 of this embodiment includes only one bidirectional conductive controllable transistor, which has few components and a simple structure, and can reduce the cost of the power supply circuit 100, thereby reducing the cost of the microwave heating device 10.

[0035] In one embodiment, the controllable transistor may be one or more of a triode, a power tube, a thyristor diode, and a bidirectional thyristor diode, which is not limited here.

[0036] In one embodiment, the power supply circuit 100 also includes a first zero-crossing detection circuit (not marked in the figure) and a second zero-crossing detection circuit 140. Among them, the first zero-crossing detection circuit is electrically connected to the rectifier circuit 110 and the control circuit 400 respectively, and the first zero-crossing detection circuit is used to detect the zero-crossing signal of the positive half-cycle signal in the AC signal, and output the positive phase zero point signal to the control circuit 400. The second zero-crossing detection circuit 140 is connected to the rectifier circuit 110 and the control circuit 400 respectively, and the second zero-crossing detection circuit 140 is used to detect the zero-crossing signal of the negative half-cycle signal in the AC signal, and output the reverse phase zero point signal to the control circuit 400. For example, the first zero-crossing detection circuit is connected to the live wire, and the second zero-crossing detection circuit 140 is connected to the neutral wire. Among them, the zero-crossing signal can be used to adjust the first control parameter, the second control parameter or the third control parameter, etc., which is not limited here.

[0037] In one embodiment, the first zero-crossing detection circuit and the second zero-crossing detection circuit 140 have the same structure. Specifically, the second zero-crossing detection circuit 140 includes a diode D31, a resistor R31, a resistor R32, a resistor R33, a resistor R34 and a switch tube Q31, the anode of the diode D31 is grounded to receive the negative half-cycle signal of the AC signal, the two ends of the resistor R31 are respectively connected to the cathode of the diode D31, one end of the resistor R32 and one end of the resistor R33, the other end of the resistor R32 is grounded, the other end of the resistor R33 is connected to the control end of the switch tube Q31, the second end of the switch tube Q31 is grounded GND, one end of the resistor R34 is connected to the DC power supply signal VCC, the other end of the resistor R34 is respectively connected to the first end of the switch tube Q31 and the control circuit 400, and outputs an inverted zero-crossing signal.

[0038] In one embodiment, the microwave generating circuit 200 includes a resonant capacitor C2, a transformer L2, a voltage doubling circuit 210 and a magnetron 220. The resonant capacitor C2 is connected in series with the inverter switch 130 and then connected in parallel to both ends of the voltage conversion circuit 120. The primary coil of the transformer L2 is connected in parallel with the resonant capacitor C1. The voltage doubling circuit 210 is connected to the secondary coil of the transformer L2 to generate a voltage to drive the magnetron 220.

[0039] In other embodiments, the microwave generating circuit 200 may include a semiconductor device, a module, an integrated circuit, etc. for generating microwaves, which is not limited herein.

[0040] In one embodiment, the inverter switch 130 includes any one of a triode and a power tube, which is not limited here.

[0041] In one embodiment, the control circuit 400 includes a processor (not shown) and peripheral circuits for maintaining normal operation of the processor. The processor may be an integrated circuit chip with signal processing capabilities. The processor may also be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array (FPGA) or other programmable logic devices. The general-purpose processor may also be a microprocessor or the processor may also be any conventional processor, etc.

[0042] In one embodiment, an independent second control circuit (not marked in the figure) may be provided in the power supply circuit 100, and the second control circuit is electrically connected to the control circuit 400 of the microwave heating device 10, and the control circuit 400 controls the operation of the power supply circuit 100 by controlling the operation of the second control circuit.

[0043] In one embodiment, the first control parameter of the inverter switch 130 may be the driving frequency of the inverter switch 130 , or the duty cycle of the pulse width modulation signal of the inverter switch 130 , or the driving frequency of the inverter switch 130 and the duty cycle of the pulse width modulation signal.

[0044] Among them, because the driving frequency of the inverter switch 130 needs to meet When the driving frequency of the inverter switch 130 or the duty cycle of the pulse width modulation signal is adjusted to a certain extent, the limitation of the inherent frequency of the inverter switch 130 causes the inverter switch 130 to be unable to execute the driving frequency or the duty cycle of the pulse width modulation signal, and therefore, the heating power of the microwave generating circuit 200 cannot be further increased or further decreased, resulting in a narrow adjustable range of the heating power of the microwave generating circuit 200. In order to solve the above technical problems, the present application proposes a control method applied to the above microwave heating device 10 in combination with the above microwave heating device 10 to improve the problem of too small a heating power range.

[0045] See also Figure 3 , Figure 3 1 is a flow chart of an embodiment of a control method for a microwave heating device provided by the present application, and the control method comprises the following steps:

[0046] Step S100: obtaining power regulation requirements.

[0047] The power demand of this embodiment includes power reduction and power increase. The power adjustment demand can be determined based on the user's target heating power and the actual heating power, which is not limited here. The target heating power can be the heating power input by the user, and the target heating power can also be the heating power corresponding to the heating mode input by the user, which is not limited here. The target heating power can be a specific value or a range of values, which is not limited here.

[0048] Step S200: In response to the power regulation requirement of reducing power, the voltage conversion circuit is controlled to operate in a voltage reduction mode, and a first control parameter of the inverter switch is adjusted to reduce the actual heating power of the microwave heating device to a target heating power.

[0049] If the power demand is adjusted to reduce power, that is, the actual heating power is higher than the target heating power, the microwave generating circuit needs to reduce power so that the microwave heating device can heat at the target heating power. Therefore, the voltage conversion circuit is controlled to work in the step-down mode to reduce the bus voltage of the power supply circuit, thereby reducing the power of the microwave generating circuit. At the same time, the first control parameter of the inverter switch can also be adjusted to further adjust the power of the microwave generating circuit, and further reduce the actual heating power of the microwave heating device to the target heating power.

[0050] Step S300: In response to the power regulation requirement being a power increase, the voltage conversion circuit is controlled to operate in a voltage increase mode, and a first control parameter of the inverter switch is adjusted to adjust the actual heating power of the microwave heating device to a target heating power.

[0051] If the power demand is adjusted to boost power, that is, the actual heating power is lower than the target heating power, the microwave generating circuit needs to increase the power so that the microwave heating device can heat at the target heating power. Therefore, the voltage transformer circuit is controlled to work in the boost mode to increase the bus voltage of the power supply circuit, thereby increasing the power of the microwave generating circuit. At the same time, the first control parameter of the inverter switch can also be adjusted to further adjust the power of the microwave generating circuit, and further adjust the actual heating power of the microwave heating device to the target heating power.

[0052] The control method of the present application obtains the power regulation demand, and controls the voltage transformer circuit to operate in the buck mode or the boost mode based on the power regulation demand, so as to realize the primary regulation of the heating power of the microwave heating device by adjusting the bus voltage of the power supply circuit, and realize the secondary regulation of the heating power of the microwave heating device by adjusting the first control parameter of the inverter switch, so as to adjust the actual heating power of the microwave heating device to the target heating power. That is, the control method of the present application can realize the two-stage power regulation of the microwave heating device, and by controlling the voltage transformer circuit to operate in the buck mode or the boost mode, or adjusting the first control parameter of the inverter switch, it can improve the problem of too small heating power range caused by limited regulation range due to one or two factors, and at the same time can improve the regulation accuracy of the microwave heating device.

[0053] In one embodiment, the control method further comprises the following steps:

[0054] Step S400: determining whether the target heating power is less than a preset power.

[0055] At this time, obtaining the power regulation demand can be considered as obtaining the target heating power, and the power regulation demand is determined based on the size between the target heating power and the preset power. Existing microwave heating equipment mainly focuses on high-power heating, such as a heating power greater than 500W. In order to meet the user's demand for low-power heating, such as a heating power of 0-500W, the present application sets a preset power to identify the user's heating demand. For example, when the target heating power is greater than or equal to the preset power, it is a high-power heating demand, and when the target heating power is less than the preset power, it is a low-power heating demand. The preset power can be a fixed power value in the microwave heating device; the microwave heating device can be set with multiple preset powers, and the user can choose to set a specific preset power based on demand or the control circuit can choose to set the specific preset power based on the user's usage habits.

[0056] After the target heating power is obtained, the target heating power is compared with the preset power to determine the power adjustment requirement. If the target heating power is less than the preset power, step S200 is executed; if the target heating power is greater than or equal to the preset power, step S300 is executed.

[0057] This embodiment determines the power regulation demand based on the target heating power and the preset power. When the user needs low-power heating, the transformer circuit is directly controlled to operate in the step-down mode, and the first control parameter of the inverter switch is adjusted. Compared with the reduction method of only adjusting the first control parameter, the transformer circuit operates in the step-down mode to reduce the bus voltage of the power supply circuit, which can further reduce the heating power of the microwave heating device and reduce the minimum heating power of the microwave heating device. In addition, the regulation rate of the microwave heating device can be improved.

[0058] In one embodiment, the preset power includes 500W-1000W. Existing microwave heating equipment mainly focuses on high-power heating, and its minimum heating power can be as low as 500W. The specific value of the preset power can be set according to the minimum heating power that can be achieved by the inverter switch, for example, the preset power can be 500W, 600W, 650W, 800W, 1000W, etc.

[0059] In one embodiment, see Figure 4 , Figure 4 yes Figure 3 The flowchart of step S200 in the embodiment is a schematic diagram of an embodiment. Step S200 can be implemented by the following steps:

[0060] Step S210: adjusting the third control parameter of the first switch tube, and controlling the second switch tube to be turned off, so as to control the voltage conversion circuit to operate in a step-down mode.

[0061] Specifically, step S210 can be implemented through steps S211 and S212:

[0062] Step S211: controlling the first switch tube to operate and controlling the second switch tube to be turned off, so as to control the voltage conversion circuit to operate in a step-down mode.

[0063] The first switch tube is in working state and the second switch tube is in cut-off state, so that the voltage conversion circuit works in buck mode. When the voltage conversion circuit works in buck mode, the voltage output by the voltage conversion circuit is less than the voltage output by the rectifier circuit, which can reduce the bus voltage of the power supply circuit.

[0064] Step S212: adjusting a third control parameter of the first switch tube to reduce the voltage, wherein the third control parameter includes a driving frequency of the first switch tube or a duty cycle of a pulse width modulation signal.

[0065] By adjusting the third control parameter, for example, only adjusting the driving frequency of the first switching tube, or only adjusting the duty cycle of the pulse width modulation signal, or adjusting both the driving frequency and the duty cycle of the pulse width modulation signal, the output voltage of the transformer circuit can be adjusted, that is, the bus voltage of the power supply circuit can be adjusted, thereby reducing the power of the microwave generating circuit and further reducing the heating power of the microwave heating device.

[0066] Step S220: adjusting a first control parameter of the inverter switch.

[0067] When the bus voltage of the power supply circuit is reduced, the first control parameter of the inverter switch can be adjusted to further adjust the power of the microwave generating circuit, so as to further reduce the heating power of the microwave heating device. For example, the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal can be adjusted, or the driving frequency and the duty cycle of the pulse width modulation signal can be adjusted simultaneously.

[0068] After adjusting the first control parameter of the inverter switch, it is determined whether the actual heating power is reduced to the target heating power, if not, the steps after step S210 are returned to be executed. If yes, the adjustment of the heating power of the microwave heating device is stopped.

[0069] It is worth noting that when adjusting the third control parameter of the first switching tube and the first control parameter of the inverter switch, the order of driving frequency adjustment and duty cycle adjustment is not limited; the specific amplitude and number of control parameter adjustments can be determined based on factors such as target heating power, actual heating power, and software and hardware performance of the microwave heating equipment.

[0070] In the case of power reduction demand, this embodiment adjusts the third control parameter of the first switch tube to control the second switch tube to be in the cut-off state, so that the voltage conversion circuit works in the step-down mode, which can reduce the bus voltage of the power supply circuit, and then adjusts the first control parameter of the inverter switch to further reduce the bus voltage of the power supply circuit, thereby further reducing the heating power of the microwave heating device. Therefore, this embodiment can improve the problem of too high minimum heating power due to limited adjustment range of one or two factors by adjusting the working mode of the voltage conversion circuit, the third control parameter of the first switch tube and the first control parameter of the inverter switch, and at the same time can improve the adjustment accuracy of the microwave heating device.

[0071] In one embodiment, see Figure 5 , Figure 5 yes Figure 3 The flowchart of step S300 in the embodiment is a schematic diagram of an embodiment, and step S300 can be implemented by the following steps:

[0072] Step S310: Control the first switch tube to be turned on, and adjust the second control parameter of the second switch tube to control the voltage conversion circuit to work in the boost mode.

[0073] Specifically, step S310 can be implemented through steps S311-S312:

[0074] Step S311: controlling the first switch tube to be turned on, and controlling the second switch tube to operate, so as to control the voltage conversion circuit to operate in a boost mode.

[0075] The first switch tube is in the on state, and the second switch tube is in the working state, so that the transformer circuit works in the boost mode. When the transformer circuit works in the boost mode, the voltage output by the transformer circuit is greater than or equal to the voltage output by the rectifier circuit, thereby increasing the bus voltage of the power supply circuit.

[0076] Step S312: adjusting a second control parameter of the second switch tube to increase the voltage, wherein the second control parameter includes a driving frequency of the second switch tube or a duty cycle of a pulse width modulation signal.

[0077] By adjusting the second control parameter of the second switch tube, for example, only adjusting the driving frequency of the second switch tube, or only adjusting the duty cycle of the pulse width modulation signal, or adjusting both the driving frequency and the duty cycle of the pulse width modulation signal, the output voltage of the transformer circuit can be adjusted, that is, the bus voltage of the power supply circuit is adjusted, thereby increasing the power of the microwave generating circuit, and further increasing the heating power of the microwave heating device.

[0078] Step S320: adjusting a first control parameter of the inverter switch.

[0079] When the bus voltage of the power supply circuit is increased, the first control parameter of the inverter switch can be adjusted to further adjust the power of the microwave generating circuit, so as to further increase the heating power of the microwave heating device. For example, the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal can be adjusted, or the driving frequency and the duty cycle of the pulse width modulation signal can be adjusted simultaneously.

[0080] After adjusting the first control parameter of the inverter switch, it is determined whether the actual heating power is increased to the target heating power, if not, the process returns to the steps after step S310. If yes, the adjustment of the heating power of the microwave heating device is stopped.

[0081] It is worth noting that when adjusting the second control parameter of the second switch tube and the first control parameter of the inverter switch, the order of driving frequency adjustment and duty cycle adjustment is not limited; the specific amplitude and number of control parameter adjustments can be determined based on factors such as target heating power, actual heating power, and software and hardware performance of the microwave heating equipment.

[0082] In the case of a power increase demand, this embodiment first controls the first switch tube to be turned on and adjusts the second control parameter of the second switch tube so that the voltage conversion circuit works in a voltage increase mode, which can increase the bus voltage of the power supply circuit, and then adjusts the first control parameter of the inverter switch to further increase the bus voltage of the power supply circuit, thereby further increasing the heating power of the microwave heating device. Therefore, this embodiment can improve the problem of too low maximum heating power due to limited adjustment range of one or two factors by adjusting the working mode of the voltage conversion circuit, the second control parameter of the second switch tube, and the first control parameter of the inverter switch, and at the same time can improve the adjustment accuracy of the microwave heating device.

[0083] The present application provides a computer storage medium, referring to Figure 6 , Figure 6 1 is a structural diagram of an embodiment of a computer storage medium provided in the present application, wherein the computer storage medium 20 stores computer program instructions 21, and the computer program instructions 21 can be executed by a processor to execute a control method for a microwave heating device, wherein the control method for a microwave heating device is any one of the control method embodiments for the microwave heating device described above, which will not be described in detail herein.

[0084] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a microwave heating device, characterized in that: The microwave heating device is provided with a power supply circuit, the power supply circuit includes a rectifier circuit, an inverter switch and a transformer circuit electrically connected to the rectifier circuit and the inverter switch, and the control method includes: Obtain power regulation requirements; In response to the power regulation requirement being a power reduction, controlling the voltage conversion circuit to operate in a voltage reduction mode, and adjusting a first control parameter of the inverter switch to reduce the actual heating power of the microwave heating device to a target heating power; In response to the power regulation requirement being a power increase, the voltage conversion circuit is controlled to operate in a voltage increase mode, and the first control parameter of the inverter switch is adjusted to adjust the actual heating power of the microwave heating device to a target heating power.

2. The control method according to claim 1, characterized in that: Also includes: The power adjustment requirement is determined based on the difference between the target heating power and the preset power.

3. The control method according to claim 1, characterized in that: The voltage conversion circuit includes a first switch tube, a first inductor, and a second switch tube. The first end and the second end of the first switch tube are respectively connected to the rectifier circuit and one end of the first inductor. The first end and the second end of the second switch tube are respectively connected to the other end of the first inductor, the inverter switch, and the rectifier circuit. The step of controlling the voltage conversion circuit to operate in a boost mode and adjusting a first control parameter of the inverter switch includes: Controlling the first switch tube to be turned on, and adjusting a second control parameter of the second switch tube to control the voltage conversion circuit to operate in a boost mode; adjusting a first control parameter of the inverter switch; Among them, the first control parameter includes the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal; the second control parameter includes the driving frequency of the second switch tube or the duty cycle of the pulse width modulation signal.

4. The control method according to claim 1, characterized in that: The voltage conversion circuit includes a first switch tube, a first inductor, and a second switch tube. The first end and the second end of the first switch tube are respectively connected to the rectifier circuit and one end of the first inductor. The first end and the second end of the second switch tube are respectively connected to the other end of the first inductor, the inverter switch, and the rectifier circuit. The step of controlling the voltage conversion circuit to operate in a step-down mode and adjusting a first control parameter of the inverter switch includes: adjusting a third control parameter of the first switch tube, and controlling the second switch tube to be cut off, so as to control the voltage conversion circuit to operate in the step-down mode; adjusting a first control parameter of the inverter switch; Among them, the first control parameter includes the driving frequency of the inverter switch or the duty cycle of the pulse width modulation signal; the third control parameter includes the driving frequency of the first switch tube or the duty cycle of the pulse width modulation signal.

5. The control method according to claim 2, characterized in that: The preset power ranges from 500W to 1000W.

6. A power supply circuit, characterized in that: Used in a microwave heating device, the microwave heating device comprises a control circuit and a power supply circuit electrically connected to the control circuit, the power supply circuit comprising: Rectification circuit; A voltage transformation circuit electrically connected to the rectification circuit and the microwave generating circuit of the microwave heating device; an inverter switch, electrically connected to the rectifier circuit and the microwave generating circuit; Wherein, the transformer circuit and the inverter switch are electrically connected to the control circuit, so that the control circuit adopts the control method described in any one of claims 1 to 5 to control the operation of the transformer circuit and the inverter switch, thereby controlling the heating power of the microwave generating circuit.

7. The power supply circuit according to claim 6, characterized in that: The voltage conversion circuit comprises: A first switch tube, wherein a first end of the first switch tube is electrically connected to the rectifier circuit, and a control end of the first switch tube is connected to the control circuit; A first inductor, one end of the first inductor being electrically connected to the second end of the first switch tube; a second switch tube, wherein a first end of the second switch tube is electrically connected to the other end of the first inductor and the microwave generating circuit, a second end of the second switch tube is grounded, and a control end of the second switch tube is electrically connected to the control circuit; Among them, the voltage conversion circuit works in the step-down mode, the first switch tube works with the third control parameter, and the second switch tube is cut off; the voltage conversion circuit works in the step-up mode, the first switch tube is turned on, and the second switch tube is turned on with the second control parameter.

8. The power supply circuit according to claim 7, characterized in that: The voltage conversion circuit also includes: a first diode, wherein an anode of the first diode is grounded, and a cathode of the first diode is electrically connected to a first end of the first switch tube and one end of the first inductor; A second diode, wherein an anode of the second diode is electrically connected to the other end of the first inductor and the first end of the second switch tube, and a cathode of the second diode is electrically connected to the microwave generating circuit.

9. The power supply circuit according to claim 8, characterized in that: The voltage conversion circuit also includes: A filter capacitor, one end of which is electrically connected to the cathode of the second diode, and the other end of which is grounded.

10. A microwave heating device, characterized in that: include: The power supply circuit, control circuit and microwave generating circuit described in any one of claims 6 to 9, wherein the microwave generating circuit is electrically connected to the voltage transformer circuit and the inverter switch, respectively, and the control circuit adopts the control method described in any one of claims 1 to 5 to control the operation of the voltage transformer circuit and the inverter switch, so as to control the heating power of the microwave generating circuit.

11. A computer storage medium, characterized in that: The computer storage medium stores computer program instructions, and the computer program instructions can be executed by a processor to perform the control method according to any one of claims 1 to 5.

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