CN113437859A - Power control method, circuit and device and cooking appliance - Google Patents
Power control method, circuit and device and cooking appliance Download PDFInfo
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- CN113437859A CN113437859A CN202110605149.2A CN202110605149A CN113437859A CN 113437859 A CN113437859 A CN 113437859A CN 202110605149 A CN202110605149 A CN 202110605149A CN 113437859 A CN113437859 A CN 113437859A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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Abstract
The application relates to a power control method, a circuit, a device, a cooking appliance and a computer readable storage medium. The method comprises the following steps: the control module controls the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load; the preset waveform signal comprises a first half wave of a first preset quantity and a full wave of a second preset quantity; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; and when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load. The method can simultaneously meet the test requirements of voltage flicker and harmonic content.
Description
Technical Field
The present application relates to the field of cooking appliances, and in particular, to a power control method, circuit, device, cooking appliance, and computer-readable storage medium.
Background
The cooking appliance may be used to heat and cook food in the cooking cavity, and generally, a high-power resistive load (e.g., a heating tube or a heating wire) is disposed in the cooking appliance, and the high-power resistive load generates heat to heat and cook the food. In order to be able to control the heating of food with different output powers, power control circuits are usually provided within the cooking appliance.
The signal output by the traditional power control circuit often has the problem of voltage flicker or more harmonic waves, and can not meet the test requirements on the voltage flicker and the harmonic wave content in the industry at the same time.
Disclosure of Invention
In view of the above, there is a need to provide a power control method, circuit, device, cooking appliance and computer readable storage medium capable of simultaneously meeting the test requirements for voltage flicker and harmonic content in the industry.
In one aspect, the present invention provides a power control method, applied to a control module for controlling a power load of a household appliance, where the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, and the full wave includes a first half-wave and a second half-wave, and the method includes: the control module controls the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load; the preset waveform signal comprises a first half wave of a first preset quantity and a full wave of a second preset quantity; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; and when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load.
In one embodiment, the preset waveform signal includes a first preset number of first half-waves, a second preset number of full-waves, and a third preset number of second half-waves; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; when the mains supply loads a first zero crossing point after a first half of a first preset number to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset number of full waves to the power load; after the commercial power loads a second preset number of full waves to the power load, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be turned off, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be turned on until the commercial power loads a third preset number of second half waves to the power load.
In one embodiment, the control module is connected to the zero-crossing detection module, and the zero-crossing detection module is configured to detect a zero-crossing point of the utility power and output a zero-crossing detection signal, and the method further includes: the control module acquires a zero-crossing detection signal output by the zero-crossing detection module; if the zero-crossing detection signal suddenly changes from the second level to the first level, the control module judges that the commercial power is at a first zero-crossing point; and if the zero-crossing detection signal suddenly changes from the first level to the second level, the control module judges that the commercial power is at a second zero-crossing point.
In one embodiment, the first predetermined number is equal to the third predetermined number.
In another aspect, an embodiment of the present invention provides a power control circuit, applied to control a power load of a household appliance, where the circuit includes: the first end of the controllable switch is used for connecting the commercial power, and the second end of the controllable switch is connected with the power load; the commercial power can output a full wave, and the full wave comprises a first half wave and a second half wave; the control module is connected with the control end of the controllable switch and used for controlling the on-off of the controllable switch so as to load a periodic preset waveform signal to the power load by the mains supply; the preset waveform signal comprises a first half wave of a first preset quantity and a full wave of a second preset quantity; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; and when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load.
In one embodiment, the power control circuit further comprises a zero-crossing detection module, wherein the zero-crossing detection module is used for detecting a zero-crossing point of the mains supply and outputting a zero-crossing detection signal; the control module is connected with the zero-crossing detection module, and is also used for acquiring a zero-crossing detection signal output by the zero-crossing detection module and judging that the commercial power is at a first zero-crossing point when the zero-crossing detection signal suddenly changes from a second level to a first level; and the commercial power is judged to be at a second zero crossing point when the zero-crossing detection signal suddenly changes from the first level to the second level.
In one embodiment, the control module is further configured to control on/off of the controllable switch so that the utility power loads the power load with a periodic preset waveform signal including a first half-wave of a first preset number, a full-wave of a second preset number, and a second half-wave of a third preset number; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; and when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load. After the commercial power loads a second preset number of full waves to the power load, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be turned off, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be turned on until the commercial power loads a third preset number of second half waves to the power load.
In another aspect, an embodiment of the present invention further provides a power control device, which is applied to a control module to control a power load of a household appliance, where the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, the full wave includes a first half-wave and a second half-wave, the power control device includes a control module, and the control module is configured to instruct the control module to control on/off of the controllable switch, so that the mains supply loads a periodic preset waveform signal to the power load; the preset waveform signal comprises a first half wave of a first preset quantity and a full wave of a second preset quantity; during a first half-wave period of a first preset number, when the commercial power is at a first zero crossing point, the control module is used for indicating the control module to control the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module is used for indicating the control module to control the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load; and when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module is used for indicating the control module to control the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load.
In still another aspect, an embodiment of the present invention further provides a cooking appliance, where the cooking appliance includes a power load, and includes a power control circuit as in any of the above embodiments.
In still another aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the power control method in any of the above embodiments.
Based on the power control method in the embodiment of the application, the controllable switch is controlled by the control module according to the zero-crossing point of the commercial power, so that the commercial power can load a periodic preset waveform signal to the power load through the controllable switch. The preset waveform signal comprises a first half wave with a first preset quantity and a full wave with a second preset quantity, and the advantages of the interval type full wave mode and the full half wave mode are integrated, so that the preset waveform signal loaded on the power load can simultaneously pass the test requirements of voltage flicker and harmonic content.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic waveform diagram of a full-wave mode and a full-half-wave mode;
FIG. 2 is a flow diagram of a power control method in one embodiment;
FIG. 3 is a schematic diagram illustrating waveforms of predetermined waveform signals according to an embodiment;
FIG. 4 is a flow chart illustrating a power control method according to another embodiment;
FIG. 5 is a schematic diagram of a preset waveform signal according to another embodiment;
FIG. 6 is a schematic diagram of a process for detecting a first zero crossing and a second zero crossing in one embodiment;
FIG. 7 is a block diagram of a power control circuit in one embodiment;
FIG. 8 is a circuit schematic of an opto-isolator circuit according to one embodiment;
FIG. 9 is a circuit schematic of a zero crossing detection module in one embodiment;
FIG. 10 is a block diagram showing the structure of a power control device according to an embodiment;
FIG. 11 is a schematic view of a cooking appliance in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As described in the background art, the power control circuit in the prior art has a problem that the test requirements of voltage flicker and harmonic content in the industry cannot be met at the same time, and the inventor finds that the problem arises because the current power control method often adopts a wave dropping technique for power control, and the waveform of the wave dropping technique is as shown in fig. 1. The wave dropping technology comprises two waveforms of a full positive (or negative) half wave mode or a spaced full wave mode.
The frequency of the full-half wave (positive half wave or negative half wave) mode is the same as that of the alternating current power supply, and the frequency of the alternating current power supply exceeds the range which can be determined by human beings, namely, the flicker problem can not be caused. However, the waveform difference of the energy that can be supplied by the ac power supply in a statistical period is large, which may cause a serious harmonic current problem. Therefore, the full positive (or negative) half-wave mode can only meet the requirements of the voltage flicker test but cannot meet the requirements of the harmonic content test.
The interval type full wave mode and the waveform of the energy which can be supplied by the power grid in a statistical period are almost not different in shape (namely the obtained waveform is equivalent to a sine wave with a reduced amplitude), and the problem of harmonic current cannot be caused. However, the frequency of the waveform is half of the frequency of the alternating current power supply, the flicker can be judged by naked eyes, and the voltage fluctuation shows that the power falls from 100 percent to 0 percent in an observation interval and then rises to 100 percent of violent fluctuation. A large problem of fluctuating flicker arises.
Therefore, the control mode based on the wave dropping technology in the traditional technology cannot meet the test requirements of voltage flicker and harmonic content in the industry at the same time.
Based on the above reasons, the invention provides a power control method, which is applied to a control module for controlling a power load of a household appliance, wherein the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, and the full wave comprises a first half wave and a second half wave. It is understood that utility power refers to a sinusoidal ac power source provided by the power system to the average user. The full wave refers to a complete sine wave, the complete sine wave consists of a positive half wave and a negative half wave, and when the first half wave is the negative half wave, the second half wave is the positive half wave; when the first half-wave is a negative half-wave, the second half-wave is a positive half-wave.
As shown in fig. 2, the power control method provided by the present invention includes step S100.
And S100, controlling the on-off of the controllable switch by the control module so that the commercial power loads a periodic preset waveform signal to the power load.
The preset waveform signal includes a first preset number of first half waves and a second preset number of full waves.
It will be appreciated that the full half wave mode does not cause flicker problems but carries more harmonics, whereas the spaced full wave mode has low harmonic content but causes flicker problems. In order to combine the advantages of the two methods, the controllable switch is controlled, so that the periodic preset waveform signal loaded to the power load by the mains supply contains a first half wave of a first preset quantity and a full wave of a second preset quantity. The harmonic content in the full-half wave mode is reduced by adding a second preset number of full waves with lower harmonic content, so that the preset waveform signal meets the requirements on voltage flicker and harmonic content in the industry.
Step S100 is specifically realized by step S110 and step S130.
And S110, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads a first half-wave with a first preset number to the power load.
The first zero crossing point is a zero crossing point when the commercial power is switched from the second half wave to the first half wave, the second zero crossing point is a zero crossing point when the commercial power is switched from the first half wave to the second half wave, and a full wave output by the commercial power comprises a first zero crossing point and a second zero crossing point. As shown in the figure, the interval between the first zero-crossing point and the second zero-crossing point is the same as the duration of the first half-wave, the controllable switch is turned on at the first zero-crossing point and turned off at the second zero-crossing point, and the commercial power can be connected to the power load through the controllable switch and load a complete first half-wave to the power load during the time period when the controllable switch is turned on. In a plurality of continuous full waves of the commercial power output, the controllable switch is controlled repeatedly in a manner of controlling the controllable switch in step S110, so that the commercial power can load a first preset number of first half-waves to the power load.
And S130, when the commercial power loads the first zero crossing point after the first half of the first preset number to the power load, the control module controls the controllable switch to be switched on so that the commercial power loads the full wave of the second preset number to the power load.
After the first half waves of the first preset quantity are loaded on the power load, in order to reduce the harmonic content, the full waves of the second preset quantity are loaded on the power load. If the interval between the last first half-wave and the first full-wave in a single period of the preset waveform signal is too long, the output power of the utility power may suddenly change from 50% to 0% and then suddenly change from 0% to 100% in the utility power period, which will bring about the problem of voltage flicker again. In order to ensure the continuity of the preset waveform signal, the controllable switch needs to be controlled to be turned on at the first zero crossing point after the mains supply loads the first half of the first preset number to the power load, and the controllable switch is controlled to be turned off after the mains supply loads the full wave of the second preset number to the power load. Fig. 3 schematically illustrates the preset waveform signals in one embodiment, and it is understood that although a plurality of first half waves and a plurality of full waves are illustrated, fig. 3 is only an illustration, and both the first preset number and the second preset number may be 1.
Based on the power control method in the embodiment of the application, the controllable switch is controlled by the control module according to the zero-crossing point of the commercial power, so that the commercial power can load a periodic preset waveform signal to the power load through the controllable switch. The preset waveform signal comprises a first preset number of the first half waves and a second preset number of the full waves, and the advantages of the interval type full wave mode and the full half wave mode are integrated, so that the preset waveform signal loaded on the power load can simultaneously pass the test requirements of voltage flicker and harmonic content.
In an embodiment, the preset waveform signal includes the first half-wave of the first preset number, the full-wave of the second preset number, and the second half-wave of the third preset number, as shown in fig. 4, and the step S100 is specifically implemented by steps S110 to S150.
And S110, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads a first half-wave with a first preset number to the power load.
And S130, when the commercial power loads the first zero crossing point after the first half of the first preset number to the power load, the control module controls the controllable switch to be switched on so that the commercial power loads the full wave of the second preset number to the power load.
And S150, after the commercial power loads a second preset number of full waves to the power load, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be turned off, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be turned on until the commercial power loads a third preset number of second half waves to the power load.
It is to be understood that, in order to ensure the symmetry of the waveform, the preset waveform signal may further include a third preset number of consecutive second half-waves after the utility power loads the power load with the second preset number of full-waves. Fig. 5 schematically illustrates the preset waveform signals in another embodiment, and it is understood that although a plurality of first half-waves, a plurality of second half-waves and a plurality of full-waves are illustrated, fig. 5 is only an exemplary diagram, and the first preset number, the second preset number and the third preset number may be 1.
In an embodiment, the control module is connected to the zero-crossing detection module, and the zero-crossing detection module is configured to detect a zero-crossing point of the utility power and output a zero-crossing detection signal, as shown in the figure, the method further includes steps S200 and S210.
S200, the control module acquires a zero-crossing detection signal output by the zero-crossing detection module.
The zero-crossing detection signal is used for reflecting the level turnover condition of the commercial power, and a first zero-crossing point and a second zero-crossing point of the commercial power can be judged according to the zero-crossing detection signal.
S210, if the zero-crossing detection signal suddenly changes from the second level to the first level, the control module judges that the commercial power is at a first zero-crossing point; and if the zero-crossing detection signal suddenly changes from the first level to the second level, the control module judges that the commercial power is at a second zero-crossing point.
Specifically, the zero-crossing detection module correspondingly outputs a zero-crossing detection signal of the second level when the commercial power outputs the second half-wave, and the zero-crossing detection module correspondingly outputs a zero-crossing detection signal of the first level when the commercial power outputs the first half-wave, so that when the zero-crossing detection signal suddenly changes from the second level to the first level, the commercial power can be judged to be at the first zero crossing point. When the zero-crossing detection signal suddenly changes from the first level to the second level, the commercial power can be judged to be at the second zero-crossing point.
In some embodiments, the first preset number, the second preset number and the third preset number may be set according to the power required to be output by the power load and the test requirements of voltage flicker and harmonic content. Increasing the first preset amount and/or the third preset amount may cause the power output by the power load to approach 50% of the rated power, and reduce the voltage flicker, but may increase the harmonic content of the preset waveform signal. Increasing the second predetermined amount to cause the power output by the power load to approach 100% of the rated power and decreasing the harmonics in the predetermined waveform signal may increase the voltage flicker.
Since the half-power (50% of rated power) output gear is the gear which is common in household appliances at present, in some embodiments, when the power of the power load is controlled to be 50% of the rated power as the target, the sum of the first preset number and the third preset number is greater than the second preset number, so that the power of the power load approaches 50% of the rated power. In some embodiments, the first predetermined number is equal to the third predetermined number, and a sum of the first predetermined number and the third predetermined number is greater than the second predetermined number. Preferably, the first predetermined number is equal to the third predetermined number and takes a value of 10 to 12, and the second predetermined number is 1. The inventor finds that if the number of the first half-wave and the second half-wave in the preset waveform signal is too large, the preset waveform signal may be similar to the output waveform of the full half-wave mode, so that the preset waveform signal cannot pass the detection when the harmonic condition of the preset waveform signal is determined according to the calculation and judgment criteria of the total harmonic current, the total harmonic distortion rate and the partial odd harmonic current. When the preset waveform signal is output according to the preferred embodiment, the preset waveform signal realizes that the output power is 50% of the rated power and simultaneously meets the requirements of a voltage flicker test and a harmonic content test.
It should be understood that although the steps in the flowcharts of fig. 2, 4 and 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2, 4 and 6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the other steps.
An embodiment of the present invention further provides a power control circuit, which is applied to control a power load 300 of a household appliance, as shown in fig. 7, the power control circuit includes a controllable switch 500 and a control module 700. A first terminal of the controllable switch 500 is used to connect to the utility power 100, and a second terminal of the controllable switch 500 is connected to the power load 300. The utility power supply 100 can output a full wave, which includes a first half-wave and a second half-wave.
The control module 700 is connected to a control end of the controllable switch 500, and the control module 700 is configured to control on/off of the controllable switch 500, so that the utility power 100 loads a periodic preset waveform signal to the power load 300. The preset waveform signal includes a first preset number of first half waves and a second preset number of full waves. When the utility power 100 is at the first zero crossing point, the control module 700 controls the controllable switch 500 to be turned on, and when the utility power 100 is at the second zero crossing point, the control module 700 controls the controllable switch 500 to be turned off until the utility power 100 loads the first half-wave of the first preset number to the power load 300. When the commercial power 100 loads the first zero-crossing point after the first half of the first preset number to the power load 300, the control module 700 controls the controllable switch 500 to be turned on, so that the commercial power 100 loads the full waves of the second preset number to the power load 300. Reference is made to the above for a description of the functions performed by the control module 700.
In one embodiment, the control module 700 is further configured to control on/off of the controllable switch 500 to enable the utility power 100 to load the periodic preset waveform signal to the power load 300 as a first half-wave with a first preset number, a second full-wave with a second preset number, and a third half-wave with a third preset number. When the utility power 100 is at the first zero crossing point, the control module 700 controls the controllable switch 500 to be turned on, and when the utility power 100 is at the second zero crossing point, the control module 700 controls the controllable switch 500 to be turned off until the utility power 100 loads the first half-wave of the first preset number to the power load 300. When the commercial power 100 loads the first zero-crossing point after the first half of the first preset number to the power load 300, the control module 700 controls the controllable switch 500 to be turned on, so that the commercial power 100 loads the full waves of the second preset number to the power load 300. After the utility power 100 loads the second preset number of full waves to the power load 300, when the utility power 100 is at the first zero crossing point, the control module 700 controls the controllable switch 500 to be turned off, and when the utility power 100 is at the second zero crossing point, the control module 700 controls the controllable switch 500 to be turned on until the utility power 100 loads the third preset number of second half waves to the power load 300.
In one embodiment, the power control circuit further includes a zero-crossing detection module, and the zero-crossing detection module is configured to detect a zero-crossing point of the utility power 100 and output a zero-crossing detection signal. The control module 700 is connected to the zero-crossing detection module and is further configured to obtain a zero-crossing detection signal output by the zero-crossing detection module. And is configured to determine that the utility power 100 is at the first zero-crossing point when the zero-crossing detection signal abruptly changes from the second level to the first level. And is used for determining that the commercial power 100 is at the second zero crossing point when the zero-crossing detection signal suddenly changes from the first level to the second level.
In one embodiment, the controllable switch 500 is a triac, and the control module 700 includes a controller and a driving unit, and the driving unit includes an optical coupling isolation circuit. The input end of the optical coupling isolation circuit is connected with the controller, and the output end of the optical coupling isolation circuit is connected with the control end of the bidirectional controllable silicon. The optical coupling isolation circuit is arranged between strong current and weak current, so that the anti-interference capability of the circuit is improved.
Further, as shown in fig. 8, the optical coupler isolation circuit includes a first optical coupler device and a switching tube. The base electrode of the switch tube is connected with the IO end of the controller after being connected with the resistor R1 in series, the emitting electrode of the switch tube is grounded, the collector electrode of the switch tube is connected with the first input end of the first optical coupler, and the resistor R2 is connected between the emitting electrode and the base electrode of the switch tube. The IO terminal of the controller and the common terminal of the resistor R1 are connected to the power supply VCC through a resistor R3. And a second input end of the first optical coupler is connected with a power supply VCC through a resistor R4. The first output end of the first optical coupler is connected with the control end of the bidirectional thyristor, and the second output end of the first optical coupler is connected with the common end of the bidirectional thyristor and the power load through a resistor R5. Preferably, the first optical coupler device is a zero-cross optical coupler device. The controller sends a driving signal to the bidirectional controllable silicon through the IO end, so that the bidirectional controllable silicon is controlled to be switched on and off. Specifically, the duration of the driving signal may be changed to make the conduction time of the triac different, so that the commercial power may output the first half-wave or the second half-wave and the full-wave through the triac.
Furthermore, the bidirectional controllable silicon can also be connected with an RC circuit in parallel. The RC circuit comprises a resistor R6 and a capacitor C1. The voltage change rate of the bidirectional controllable silicon can be reduced by arranging the RC circuit, the bidirectional controllable silicon is prevented from being conducted by mistake, and a voltage peak is absorbed.
In an embodiment, as shown in fig. 9, the zero-crossing detection module includes a diode D1, a diode D2, a second optocoupler, a resistor R7, a resistor R8, a resistor R9, and a capacitor C2. The anode of the diode D1 is connected in series with the resistor R7 and then connected to the live wire of the utility power, and the cathode of the diode D1 is connected to the first input end of the second optocoupler. The anode of the second diode D2 is connected to the neutral line of the utility power, and the cathode of the second diode D2 is connected to the cathode of the first diode D1. And the commercial power zero line ACN is connected with a second input end of the second optical coupler. The first output end of the second optical coupler is connected with the input end of the controller after being connected with a resistor R8 in series, the first output end of the second optical coupler is also used for being connected with another resistor R9 in series and then being connected with VCC (positive 5V voltage), and the second output end of the second optical coupler is used for being grounded. The input of the controller is also connected to ground through a capacitor C2.
When the commercial power outputs positive half waves, the first output end and the second output end of the second optical coupler are switched off, and the input end of the controller detects a high level. When the commercial power outputs negative half waves, the first output end and the second output end of the second optocoupler are connected, and the input end of the controller detects a low level. The controller can judge the first zero crossing point and the second zero crossing point of the commercial power according to the level of the input end connected with the zero crossing detection module.
An embodiment of the present invention further provides a power control apparatus, as shown in fig. 10, which is applied to a control module to control a power load of a household appliance, where the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, and the full wave includes a first half-wave and a second half-wave. The power control device comprises a control module 10, and the control module 10 is used for instructing the control module to control the on/off of the controllable switch, so that the commercial power loads a periodic preset waveform signal to the power load. The preset waveform signal includes a first preset number of first half waves and a second preset number of full waves.
During a first half-wave period of a first preset number, when the commercial power is at a first zero-crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; the control module 10 is configured to instruct the control module to control the controllable switch to be turned on when the first zero crossing point after the utility power loads the first half of the first preset number to the power load, so that the utility power loads the full wave of the second preset number to the power load.
In one embodiment, the preset waveform signal includes a first preset number of first half-waves, a second preset number of full-waves, and a third preset number of second half-waves. During a first half-wave period of a first preset number, when the commercial power is at a first zero-crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; when the mains supply loads a first zero crossing point after a first half of a first preset number to the power load, the control module 10 is configured to instruct the control module to control the controllable switch to be turned on, so that the mains supply loads a second preset number of full waves to the power load; after the utility power loads the power load with the second preset number of full waves, when the utility power is at the first zero crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to turn off, and when the utility power is at the second zero crossing point, the control module 10 is configured to instruct the control module to control the controllable switch to turn on until the utility power loads the power load with the third preset number of second half waves.
For specific limitations of the power control apparatus, reference may be made to the above limitations of the power control method, which are not described herein again. The modules in the power control device can be implemented in whole or in part by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
An embodiment of the present invention further provides a cooking appliance, as shown in fig. 11, the cooking appliance includes a power load and a power control circuit, and the power control circuit includes a controllable switch and a control module. The first end of the controllable switch is used for connecting the commercial power, and the second end of the controllable switch is connected with the power load. The utility power can output a full wave, and the full wave comprises a first half wave and a second half wave.
The control module is connected with the control end of the controllable switch and used for controlling the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load. The preset waveform signal includes a first preset number of first half waves and a second preset number of full waves. During the first half-wave period of the first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load. And when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load. Reference is made to the above for a description of the functions performed by the control module.
It can be understood that the cooking appliance can be used for heating and cooking food in the cooking cavity, and a power load is usually arranged in the cooking appliance, and the heating and cooking of the food are realized by generating heat through the power load. The power load is generally a high-power resistive load, such as a heating resistance wire or a heating pipe.
The electric cooking appliance body can be an oven, an electric cooker, an air fryer and the like, and the electric cooking appliance body can be suitable for various electric cooking appliances comprising power loads.
In one embodiment, the power control circuit in the cooking appliance is the same as any of the power control circuit embodiments described above, and reference is made to the above.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:
the control module controls the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load. The preset waveform signal includes a first preset number of first half waves and a second preset number of full waves.
During the first half-wave period of the first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load. And when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load.
In an embodiment, the preset waveform signal comprises said first preset number of said first half-waves, said second preset number of said full-waves and a third preset number of said second half-waves, the computer program when being executed by the processor implementing the steps of: the control module controls the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load.
During the first half-wave period of the first preset number, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be switched on, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be switched off until the commercial power loads the first half-wave of the first preset number to the power load. And when the mains supply loads a first zero crossing point after a first half of a first preset quantity to the power load, the control module controls the controllable switch to be switched on so that the mains supply loads a second preset quantity of full waves to the power load. After the commercial power loads a second preset number of full waves to the power load, when the commercial power is at a first zero crossing point, the control module controls the controllable switch to be turned off, and when the commercial power is at a second zero crossing point, the control module controls the controllable switch to be turned on until the commercial power loads a third preset number of second half waves to the power load.
In one embodiment, the computer program when executed by the processor implements the steps of:
the control module acquires a zero-crossing detection signal output by the zero-crossing detection module.
If the zero-crossing detection signal suddenly changes from the second level to the first level, the control module judges that the commercial power is at a first zero-crossing point; and if the zero-crossing detection signal suddenly changes from the first level to the second level, the control module judges that the commercial power is at a second zero-crossing point.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power control method is applied to a control module to control a power load of a household appliance, wherein the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, the full wave comprises a first half wave and a second half wave, and the method comprises the following steps:
the control module controls the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load; the preset waveform signal comprises a first preset number of the first half waves and a second preset number of the full waves; during the first half-wave of the first preset number, when the commercial power is at a first zero-crossing point, the control module controls the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module controls the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; and when the first zero crossing point after the first half of the first preset quantity is loaded to the power load by the mains supply, the control module controls the controllable switch to be switched on, so that the full wave of the second preset quantity is loaded to the power load by the mains supply.
2. The power control method of claim 1, wherein the preset waveform signal includes the first preset number of the first half-waves, the second preset number of the full-waves, and a third preset number of the second half-waves;
during the first half-wave of the first preset number, when the commercial power is at a first zero-crossing point, the control module controls the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module controls the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; when the first zero-crossing point is formed after the first half of the first preset number is loaded to the power load by the commercial power, the control module controls the controllable switch to be switched on, so that the full waves of the second preset number are loaded to the power load by the commercial power; after the mains supply loads the second preset number of full waves to the power load, when the mains supply is at a first zero crossing point, the control module controls the controllable switch to be switched off, and when the mains supply is at a second zero crossing point, the control module controls the controllable switch to be switched on until the mains supply loads the third preset number of second half waves to the power load.
3. The power control method according to claim 1, wherein the control module is connected to a zero-crossing detection module, the zero-crossing detection module is configured to detect a zero-crossing point of the utility power and output a zero-crossing detection signal, and the method further comprises:
the control module acquires a zero-crossing detection signal output by the zero-crossing detection module;
if the zero-crossing detection signal suddenly changes from the second level to the first level, the control module judges that the commercial power is at a first zero-crossing point; and if the zero-crossing detection signal suddenly changes from the first level to the second level, the control module judges that the commercial power is at a second zero-crossing point.
4. The power control method of claim 2, wherein the first predetermined number is equal to the third predetermined number.
5. A power control circuit for controlling a power load of a household appliance, the circuit comprising:
a first end of the controllable switch is used for connecting a mains supply, and a second end of the controllable switch is connected with the power load; the commercial power can output a full wave, and the full wave comprises a first half wave and a second half wave;
the control module is connected with the control end of the controllable switch and used for controlling the on-off of the controllable switch so as to load a periodic preset waveform signal to the power load by the mains supply; the preset waveform signal comprises a first preset number of the first half waves and a second preset number of the full waves;
during the first half-wave of the first preset number, when the commercial power is at a first zero-crossing point, the control module controls the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module controls the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; and when the first zero crossing point after the first half of the first preset quantity is loaded to the power load by the mains supply, the control module controls the controllable switch to be switched on, so that the full wave of the second preset quantity is loaded to the power load by the mains supply.
6. The power control circuit of claim 5, further comprising a zero-crossing detection module configured to detect a zero-crossing of the utility power and output a zero-crossing detection signal;
the control module is connected with the zero-crossing detection module, and is further used for acquiring a zero-crossing detection signal output by the zero-crossing detection module, and determining that the commercial power is at a first zero-crossing point when the zero-crossing detection signal changes from a second level to a first level suddenly; and is used for judging that the commercial power is at a second zero crossing point when the zero-crossing detection signal suddenly changes from the first level to the second level.
7. The power control circuit according to claim 5, wherein the control module is further configured to control on/off of the controllable switch to enable the commercial power to apply the periodic preset waveform signal to the power load, wherein the preset waveform signal includes the first preset number of the first half-waves, the second preset number of the full-waves, and the third preset number of the second half-waves; during the first half-wave of the first preset number, when the commercial power is at a first zero-crossing point, the control module controls the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module controls the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; when the first zero-crossing point is formed after the first half of the first preset number is loaded to the power load by the commercial power, the control module controls the controllable switch to be switched on, so that the full waves of the second preset number are loaded to the power load by the commercial power; after the mains supply loads the second preset number of full waves to the power load, when the mains supply is at a first zero crossing point, the control module controls the controllable switch to be switched off, and when the mains supply is at a second zero crossing point, the control module controls the controllable switch to be switched on until the mains supply loads the third preset number of second half waves to the power load.
8. A power control device is characterized in that the power control device is applied to a control module to control a power load of a household appliance, the power load is connected to a mains supply through a controllable switch, the mains supply can output a full wave, the full wave comprises a first half wave and a second half wave, the power control device comprises a control module, and the control module is used for indicating the control module to control the on-off of the controllable switch so that the mains supply loads a periodic preset waveform signal to the power load; the preset waveform signal comprises a first preset number of the first half waves and a second preset number of the full waves;
during the first half-wave of the first preset number, when the commercial power is at a first zero-crossing point, the control module is configured to instruct the control module to control the controllable switch to be turned on, and when the commercial power is at a second zero-crossing point, the control module is configured to instruct the control module to control the controllable switch to be turned off until the commercial power loads the first half-wave of the first preset number to the power load; and when the first zero crossing point is formed after the first half wave of the first preset quantity is loaded to the power load by the commercial power, the control module is used for indicating the control module to control the controllable switch to be switched on so as to enable the full wave of the second preset quantity to be loaded to the power load by the commercial power.
9. Cooking appliance comprising a power load, characterized in that it comprises a power control circuit according to any one of claims 5 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the power control method according to any one of claims 1 to 4.
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