CN108539707B - Circuit on-off device, control method thereof and household appliance - Google Patents
Circuit on-off device, control method thereof and household appliance Download PDFInfo
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- CN108539707B CN108539707B CN201810478918.5A CN201810478918A CN108539707B CN 108539707 B CN108539707 B CN 108539707B CN 201810478918 A CN201810478918 A CN 201810478918A CN 108539707 B CN108539707 B CN 108539707B
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- 230000000694 effects Effects 0.000 abstract description 8
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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Abstract
The invention discloses a circuit on-off device, a control method thereof and a household appliance. The control method of the circuit on-off device comprises the following steps: acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located; accumulating the accumulated duration of the current interval of the total current value; and when the accumulated time length is smaller than the circuit breaking delay time length, controlling the circuit on-off device to be conducted, and reducing the running power of at least one electric appliance in the controlled circuit or closing at least one electric appliance in the controlled circuit. The technical scheme of the invention improves the adjusting effect of the circuit on-off device.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a circuit on-off device, a control method thereof and a household appliance.
Background
In order to ensure the electricity safety and avoid the power failure caused by current limiting as much as possible, an air switch and a circuit breaking preventing device are generally adopted to carry out overall control on a circuit in series. According to the rated current of the air switch, setting the related parameters of the circuit breaking preventing device matched with the air switch so as to maintain the current in the controlled circuit in a proper interval, and avoiding current limiting and breaking while ensuring the safety. In the existing circuit breaking preventing device, when the current in the controlled circuit is larger than the rated current of the air switch, the electric appliance in the controlled circuit is immediately controlled to operate with lower power, otherwise, when the current in the controlled circuit is smaller than or equal to the rated current of the air switch, the electric appliance in the controlled circuit is immediately controlled to operate normally or operate with higher power, and the jump delay of the circuit is not considered, so that the waste of the power capacity is caused.
Disclosure of Invention
The invention mainly aims to provide a control method of a circuit on-off device, which aims to solve the technical problem of power capacity waste and improve the adjusting effect of the circuit on-off device.
In order to achieve the above object, the control method of the circuit on-off device provided by the invention comprises the following steps:
acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located;
accumulating the accumulated duration of the current interval of the total current value;
and when the accumulated time length is smaller than the circuit breaking delay time length, controlling the circuit on-off device to be conducted, and reducing the running power of at least one electric appliance in the controlled circuit or closing at least one electric appliance in the controlled circuit.
Optionally, after the step of accumulating the accumulated duration of the current interval in which the total current value is present, the control method of the circuit on-off device further includes the steps of:
and when the accumulated time is longer than or equal to the open-circuit delay time, controlling the circuit on-off device to be turned off so as to cut off the controlled circuit.
Optionally, the step of obtaining a total current value in the controlled circuit and determining the open-circuit delay duration according to a current interval in which the total current value is currently located includes:
acquiring a total current value in the controlled circuit;
when the total current value is in the breaking prevention control area, determining a current interval in which the total current value is located;
determining the breaking delay time length according to the current interval in which the total current value is currently located;
when the total current value is in a frequency control area, the circuit on-off device is controlled to be conducted, and the operation frequency of the variable frequency electric appliance in the controlled circuit is reduced according to the total current value;
when the total current value is in a normal control area, the circuit on-off device is controlled to be conducted, and an electric appliance in the controlled circuit is controlled to normally operate;
wherein the current in the normal control region is less than the current in the frequency control region, and the current in the frequency control region is less than the current in the breakage prevention control region.
Optionally, the step of accumulating the accumulated duration of the total current value in the current interval comprises:
when the total current value is in a first current interval, acquiring the change trend of the total current value;
When the total current value is in an ascending trend, comparing the total current value with a first upper limit current of the first current interval;
when the total current value is greater than or equal to the first upper limit current, determining that the total current value rises to a second current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is smaller than the first upper limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a descending trend, comparing the total current value with a first lower limit current of the first current interval;
when the total current value is smaller than the first lower limit current, determining that the total current value is reduced to a third current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is greater than or equal to the first lower limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a stable state, continuously accumulating the accumulated duration of the current interval of the total current value;
The current of the first current section is smaller than the current of the second current section, the current of the third current section is smaller than the current of the first current section, the first upper limit current of the first current section is larger than the first lower limit current of the first current section, the third upper limit current of the third current section is smaller than the second lower limit current of the second current section, and the third upper limit current of the third current section is larger than the first lower limit current of the first current section.
Optionally, the first open-circuit delay time period of the first current section is longer than the second open-circuit delay time period of the second current section, and the third open-circuit delay time period of the third current section is longer than the first open-circuit delay time period of the first current section.
Optionally, the step of determining the open circuit delay time length according to the current interval in which the total current value is currently located includes:
comparing the total current value with a preset threshold current;
when the total current value is greater than or equal to a preset threshold current, determining that the breaking delay time length is zero;
wherein the preset threshold current is greater than or equal to a second upper limit current of the second current interval.
Optionally, when the accumulated duration is smaller than the open-circuit delay duration, the step of controlling the circuit on-off device to be turned on and reducing the running power of at least one electric appliance in the controlled circuit or turning off at least one electric appliance in the controlled circuit includes:
when the accumulated time length is smaller than the difference of the open-circuit delay time length and the communication delay time length, generating a frequency-reducing instruction of the frequency-converting electric appliance in the controlled circuit;
acquiring a target operating frequency of the variable frequency electrical appliance according to the frequency reducing instruction;
comparing the target operating frequency with a preset frequency;
when the target operating frequency is smaller than the preset frequency, closing a compressor of the variable frequency electric appliance;
when the target operating frequency is greater than or equal to the preset frequency, controlling the variable frequency electric appliance to operate according to the target operating frequency;
when the cumulative time length is greater than or equal to the difference of the open-circuit delay time length and the communication delay time length, generating a closing instruction of the frequency conversion electric appliance in the controlled circuit;
closing the compressor of the variable frequency electric appliance according to the closing instruction;
the communication delay time is the shortest time required by the frequency reducing instruction or the closing instruction to be transmitted from the circuit on-off device to the frequency conversion electric appliance.
Optionally, after the step of turning off the compressor of the frequency converter, the method further comprises the steps of:
receiving a manual shutdown instruction;
when the manual shutdown instruction is received, the frequency conversion electric appliance is controlled to be closed;
when the manual shutdown instruction is not received, acquiring a total current value in the controlled circuit;
determining a power utilization control area where the total current value is located;
and when the total current value is in a normal control area, controlling the variable frequency electric appliance to resume operation.
Optionally, the control method of the circuit on-off device further comprises the following steps:
when an opening instruction of a frequency conversion electric appliance in the controlled circuit is received, acquiring a total current value in the controlled circuit;
when the total current value is in an anti-breaking control area or a frequency control area, controlling the frequency conversion electric appliance to be closed, and generating a prompt signal;
and when the total current value is in a normal control area, controlling the operation of the variable frequency electric appliance.
The invention also provides a circuit on-off device, which comprises a current sensing module, a memory, a processor and a control program of the circuit on-off device, wherein the control program is stored on the memory and can run on the processor, and the control program comprises the following components: the current sensing module is used for acquiring a total current value in the controlled circuit; the control program of the circuit on-off device realizes the steps of the control method of the circuit on-off device when being executed by the processor, and the control method of the circuit on-off device comprises the following steps: acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located; accumulating the accumulated duration of the current interval of the total current value; and when the accumulated time length is smaller than the circuit breaking delay time length, controlling the circuit on-off device to be conducted, and reducing the running power of at least one electric appliance in the controlled circuit or closing at least one electric appliance in the controlled circuit.
Optionally, the circuit on-off device further comprises an on-off module, and the on-off module is used for controlling on-off of the circuit on-off device.
Optionally, the circuit on-off device further comprises a communication module, and the communication module is used for transmitting a control instruction of the circuit on-off device.
Optionally, the circuit on-off device further comprises a timing module, and the timing module is used for accumulating duration.
Optionally, the circuit on-off device further includes a voltage sensing module, a power sensing module and a display module, wherein: the voltage sensing module is used for acquiring the power supply voltage of the controlled circuit; the power sensing module is used for acquiring the total power value of the controlled circuit; the display module is used for displaying at least one of the total current value, the power supply voltage, the total power value, the total power consumption of the controlled circuit and the running state of the circuit on-off device.
The invention also provides a household appliance comprising a circuit on-off device, wherein the circuit on-off device comprises a current sensing module, a memory, a processor and a control program of the circuit on-off device, wherein the control program is stored on the memory and can run on the processor, and the control program comprises the following components: the current sensing module is used for acquiring a total current value in the controlled circuit; the control program of the circuit on-off device realizes the steps of the control method of the circuit on-off device when being executed by the processor, and the control method of the circuit on-off device comprises the following steps: acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located; accumulating the accumulated duration of the current interval of the total current value; and when the accumulated time length is smaller than the circuit breaking delay time length, controlling the circuit on-off device to be conducted, and reducing the running power of at least one electric appliance in the controlled circuit or closing at least one electric appliance in the controlled circuit.
Optionally, the household appliance comprises an air conditioner or a refrigerator.
In the technical scheme of the invention, the control method of the circuit on-off device comprises the following steps: acquiring a total current value in a controlled circuit, and determining the breaking delay time according to a current interval in which the total current value is currently located; the accumulated total current value is in the accumulated duration of the current interval; when the accumulated time length is smaller than the breaking delay time length, the control circuit on-off device is conducted, and the running power of at least one electric appliance in the controlled circuit is reduced or at least one electric appliance in the controlled circuit is closed. The air switch for protecting the circuit and the circuit breaking preventing device for preventing the circuit from current limiting and breaking are integrated through the circuit breaking device, so that the protection function and breaking preventing function of the circuit are realized, and the current limiting and breaking of the circuit are reduced as much as possible while the safety of the circuit is ensured. Because the circuit on-off device is integrated, the problem of poor matching degree between each parameter in the air switch and the circuit breaking prevention device is solved, and each parameter (including current, time and the like) in the circuit on-off device has good matching degree, so that the control cost of the circuit is reduced, and the reliability of circuit control is improved. The integrated circuit on-off device also has a relatively simple structure, thereby facilitating installation and maintenance and reducing material cost and labor cost. Meanwhile, the running of the controlled circuit is controlled according to the relation between the accumulated time length and the breaking delay time length by accumulating the accumulated time length of the current section with the total current value, so that the jump-off delay time of the circuit is fully utilized, the waste of the power capacity is greatly reduced, and the adjusting effect of the circuit on-off device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a first embodiment of a control method of a circuit on-off device of the present invention;
FIG. 2 is a flow chart of a second embodiment of a control method of the on-off circuit of the present invention;
FIG. 3 is a detailed flowchart of step S100 in a third embodiment of a control method of the on-off circuit device of the present invention;
FIG. 4 is a schematic diagram of a break-proof control region, a frequency control region and a normal control region of a current of the control method of the circuit on-off device of FIG. 3;
FIG. 5 is a detailed flowchart of step S200 in a fourth embodiment of a control method of the on-off circuit device of the present invention;
FIG. 6 is a schematic diagram showing the relationship between the total current value and the open-circuit delay time in the control method of the circuit on-off device of the present invention;
FIG. 7 is a detailed flowchart of step S310 in a sixth embodiment of a control method of a circuit on-off device according to the present invention;
fig. 8 is a schematic structural diagram of an embodiment of the circuit switching device of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a control method of a circuit on-off device, which controls the operation of an electric appliance in a controlled circuit according to the accumulated time length of a certain current interval of the total current value in the controlled circuit and the corresponding breaking delay time length of the current interval, so as to fully utilize the breaking delay time of the circuit to adjust the controlled circuit, thereby reducing the waste of electric power capacity.
In a first embodiment of the present invention, as shown in fig. 1, a control method of a circuit on-off device includes the following steps:
step S100, obtaining a total current value in a controlled circuit, and determining the breaking delay time according to a current interval in which the total current value is currently located;
in order to control the whole controlled circuit, the circuit switching device is connected in series in the total trunk of the controlled circuit, and correspondingly, the current flowing through the circuit switching device is the total current value in the controlled circuit. Of course, the circuit switching device can also be arranged in a certain household appliance, in particular in a frequency conversion appliance, such as an air conditioner, a refrigerator and the like, so as to control the switching of the frequency conversion appliance. And obtaining a corresponding current interval according to the total current value to determine the breaking delay time length. Generally, as the total current value in the controlled circuit increases, the thermal effect of the circuit increases, the safety decreases, and correspondingly, the off delay period decreases.
Step 200, accumulating duration of the current interval of the current value of the accumulated total current;
and adjusting the controlled circuit by accumulating the accumulated time length of the current interval of the accumulated total current value. It should be noted that when the total current value in the controlled circuit changes, and the current interval in which the total current value is located changes, it is often necessary to redetermine the duration of the open circuit delay, and to redetermine the cumulative duration to adapt to the change of the controlled circuit, so as to avoid potential safety hazards or unnecessary current limiting and power outage, which will be described in detail later.
And step S300, when the accumulated time length is smaller than the breaking delay time length, the on-off device of the control circuit is conducted, and the running power of at least one electric appliance in the controlled circuit is reduced or at least one electric appliance in the controlled circuit is closed.
When the accumulated time length is smaller than the open-circuit delay time length, the accumulated heat in the controlled circuit does not reach the safety critical value, the on-off device of the controlled circuit is controlled to be conducted, the running power of at least one electric appliance in the controlled circuit is reduced, or at least one electric appliance in the controlled circuit is closed, so that the total current value of the controlled circuit is reduced, the thermal effect of the controlled circuit is reduced, and the running of the controlled circuit is regulated to be recovered to a normal state under the condition of uninterrupted power as far as possible.
In this embodiment, the circuit switching device is connected in series in the controlled circuit, and the control method of the circuit switching device includes the following steps: acquiring a total current value in a controlled circuit, and determining the breaking delay time according to a current interval in which the total current value is currently located; the accumulated total current value is in the accumulated duration of the current interval; when the accumulated time length is smaller than the breaking delay time length, the control circuit on-off device is conducted, and the running power of at least one electric appliance in the controlled circuit is reduced or at least one electric appliance in the controlled circuit is closed. The air switch for protecting the circuit and the circuit breaking preventing device for preventing the circuit from current limiting and breaking are integrated through the circuit breaking device, so that the protection function and breaking preventing function of the circuit are realized, and the current limiting and breaking of the circuit are reduced as much as possible while the safety of the circuit is ensured. Because the circuit on-off device is integrated, the problem of poor matching degree between each parameter in the air switch and the circuit breaking prevention device is solved, and each parameter (including current, time and the like) in the circuit on-off device has good matching degree, so that the control cost of the circuit is reduced, and the reliability of circuit control is improved. The integrated circuit on-off device also has a relatively simple structure, thereby facilitating installation and maintenance and reducing material cost and labor cost. Meanwhile, the running of the controlled circuit is controlled according to the relation between the accumulated time length and the breaking delay time length by accumulating the accumulated time length of the current section with the total current value, so that the jump-off delay time of the circuit is fully utilized, the waste of the power capacity is greatly reduced, and the adjusting effect of the circuit on-off device is improved.
Based on the first embodiment, as shown in fig. 2, in a second embodiment of the present invention, after step S200, the control method of the circuit on-off device further includes the following steps:
and step S320, when the cumulative time is longer than or equal to the open-circuit delay time, the control circuit on-off device is turned off to cut off the controlled circuit.
When the cumulative time is longer than or equal to the open-circuit delay time, the total current value in the controlled circuit is larger, the total current value has a stronger thermal effect, and serious potential safety hazards are likely to be brought, so that the on-off device of the control circuit is turned off to cut off the controlled circuit, and the safety of the circuit is guaranteed.
Based on the above embodiments, as shown in fig. 3, in a third embodiment of the present invention, step S100 includes:
step S110, obtaining a total current value in a controlled circuit;
step S121, when the total current value is in the anti-breaking control area, determining a current interval in which the total current value is located;
step S122, determining the breaking delay time length according to the current interval in which the total current value is currently located;
step S130, when the total current value is in the frequency control area, the on-off device of the control circuit is conducted, and the operation frequency of the frequency conversion electric appliance in the controlled circuit is reduced according to the total current value;
And step 140, when the total current value is in the normal control area, the on-off device of the control circuit is conducted, and the electric appliances in the controlled circuit are controlled to normally operate.
In this embodiment, before a specific current interval is divided according to a total current value, a rough current area is firstly divided according to the total current value, and different control strategies are adopted to adjust a controlled circuit in different current areas, so that the occurrence of current limiting and power outage is reduced as much as possible while the safety of the controlled circuit is ensured. Specifically, as shown in fig. 4, the current area includes a breaking prevention control area, a frequency control area, and a normal control area, wherein the current in the normal control area is smaller than the current in the frequency control area, the current in the frequency control area is smaller than the current in the breaking prevention control area, the second critical current between the normal control area and the frequency control area is I2q, the first critical current between the frequency control area and the breaking prevention control area is I1q, and I1q > I2q. When the total current value is in the anti-breaking control area, a current interval in which the total current value is further determined, and the breaking delay time length is determined according to the current interval so as to be executed in the subsequent steps. When the total current value is in the frequency control area, the total current value in the controlled circuit is slightly higher than the normal condition, but serious potential safety hazards are relatively avoided, the on-off conduction of the controlled circuit is realized, the operating frequency of the frequency conversion electric appliance in the controlled circuit is reduced according to the total current value, the total current value is reduced, and the controlled circuit is regulated to recover to the normal operating state. In general, as the total current value increases, the reduction amplitude of the operating frequency of the inverter increases, and the inverter may be an air conditioner, a refrigerator, or the like. When the total current value is in the normal control area, the controlled circuit is in the normal running state, the on-off device of the control circuit is turned on, and the normal running of all electric appliances is controlled.
Based on the above embodiments, as shown in fig. 5, in a fourth embodiment of the present invention, step S200 includes:
step S210, when the total current value is in a first current interval, acquiring the change trend of the total current value;
step S220, when the total current value is in an ascending trend, comparing the total current value with a first upper limit current of a first current interval;
step S221, when the total current value is greater than or equal to the first upper limit current, determining that the total current value rises to a second current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
step S222, when the total current value is smaller than the first upper limit current, continuing to accumulate the accumulated duration of the current interval of the total current value;
step S230, when the total current value is in a descending trend, comparing the total current value with a first lower limit current of a first current interval;
step S231, when the total current value is smaller than the first lower limit current, determining that the total current value is reduced to a third current interval, clearing and re-accumulating the accumulated duration of the current interval;
step S232, when the total current value is greater than or equal to the first lower limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
And step S240, when the total current value is in a stable state, continuously accumulating the accumulated duration of the current interval of the total current value.
As shown in fig. 6, the current in the first current interval is smaller than the current in the second current interval, the current in the third current interval is smaller than the current in the first current interval, the first upper limit current I1u in the first current interval is larger than the first lower limit current I1d in the first current interval, the third upper limit current I3u in the third current interval is smaller than the second lower limit current I2d in the second current interval, and the third upper limit current I3u in the third current interval is larger than the first lower limit current I1d in the first current interval. Specifically, in fig. 6, the interval corresponding to the two solid lines is a current interval, and the dashed arrow indicates the trend of the total current value in the controlled circuit, where the trend of the change may be specifically determined according to the comparison result between the current measurement value and the previous measurement value of the total current value. When the total current value is in the ascending trend, determining whether the current interval in which the total current value is located is changed according to the upper limit current on the left side of the image in fig. 6, when the current interval in which the total current value is located is changed, clearing and re-accumulating the accumulated duration of the current interval in which the total current value is located, otherwise, continuing accumulating the accumulated duration of the current interval in which the total current value is located. When the total current value is in the descending trend, determining whether the current interval in which the total current value is changed according to the lower limit current on the right side of the image in fig. 6, when the current interval in which the total current value is changed, clearing and re-accumulating the accumulated duration of the current interval in which the total current value is located, otherwise, continuing accumulating the accumulated duration of the current interval in which the total current value is located.
Further, as shown in fig. 6, the first open-circuit delay time t1 of the first current section is longer than the second open-circuit delay time t2 of the second current section, and the third open-circuit delay time t3 of the third current section is longer than the first open-circuit delay time t1 of the first current section. Along with the upgrading of the current interval, the total current value in the controlled circuit is increased, the thermal effect is increased, and the potential safety hazard is also increased, so that the open-circuit delay time is required to be reduced appropriately, and the danger caused by the fact that the controlled circuit cannot be cut off in time is avoided. It should be noted that, when the current interval in which the total current value is located changes, the open-circuit delay duration needs to be determined again according to the current interval. The settings of the upper limit current, the lower limit current and the off delay time in fig. 6 should meet the corresponding international or national standards. For example, if the current is I1, the current cannot be limited and cut off within the time t0, and if I1 is in the first current interval, the second lower limit current I2d of the second current interval should satisfy I2d > I1, and the first open delay time t1 of the first current interval satisfies t1> t0. If, according to the standard requirements, when the current is I2, the current must be limited and disconnected within the time t0', if I2 is in the first current interval, I2d > I2> I3u, and t1< t0'.
Based on the above embodiments, in a fifth embodiment of the present invention, the step of determining the off delay period according to the current interval in which the total current value is present includes:
s150, comparing the total current value with a preset threshold current;
and step 160, when the total current value is greater than or equal to a preset threshold current, determining that the disconnection delay time length is zero.
The preset threshold current is larger than or equal to a second upper limit current of the second current interval. In this embodiment, the preset threshold current corresponds to the current of the controlled circuit being directly cut off, that is, when the total current value is greater than or equal to the preset threshold current, the potential safety hazard of the controlled circuit is quite serious, and the open-circuit delay time is determined to be zero at this time, that is, the controlled circuit is directly cut off, so that the total current value is directly reduced to zero, and the total current value of the controlled circuit is not gradually reduced and adjusted.
Based on the above embodiments, in a sixth embodiment of the present invention, as shown in fig. 7, step S300 includes:
step S311, when the accumulated time length is smaller than the difference of the open-circuit delay time length and the communication delay time length, generating a frequency-reducing instruction of the frequency-conversion electric appliance in the controlled circuit;
step S311a, obtaining a target operating frequency of the frequency conversion electric appliance according to the frequency reducing instruction;
Step S311b, comparing the target operating frequency with a preset frequency;
step 311c, when the target operating frequency is smaller than the preset frequency, turning off the compressor of the variable frequency electric appliance;
step S311d, when the target operating frequency is greater than or equal to the preset frequency, controlling the variable frequency electric appliance to operate according to the target operating frequency;
step S312, when the cumulative time length is greater than or equal to the difference of the open-circuit delay time length minus the communication delay time length, a closing instruction of the frequency conversion electric appliance in the controlled circuit is generated;
step S312a, turning off the compressor of the frequency conversion electric appliance according to the turn-off instruction.
The communication delay time is the shortest time required by the transmission of the frequency reducing instruction or the closing instruction from the circuit on-off device to the frequency conversion electric appliance. The instruction transmission between the circuit switching device and the electric appliance can be realized through wired communication or through wireless communication, however, the instruction transmission usually has a certain communication delay time, and in the embodiment, the controlled circuit is regulated by further considering the influence of the communication delay time. Specifically, when the accumulated duration is less than the difference between the open-circuit delay duration and the communication delay duration, it is indicated that the frequency-reducing process is still available when the frequency-reducing instruction is transmitted to the electric appliance. Further, considering that the frequency of the variable frequency electric appliance cannot be infinitely reduced, when the target operating frequency is smaller than the preset frequency, the compressor of the variable frequency electric appliance is turned off so as to avoid damaging the variable frequency electric appliance, and the preset frequency corresponds to the lowest frequency which can be achieved by the variable frequency electric appliance; when the target operating frequency is greater than or equal to the preset frequency, controlling the variable frequency electric appliance to operate according to the target operating frequency so as to reduce the total current value. When the cumulative time length is greater than or equal to the difference of the open-circuit delay time length minus the communication delay time length, the step-down processing is not performed until the step-down instruction is transmitted to the electric appliance, and in order to ensure the safety of a controlled circuit, a closing instruction of the frequency conversion electric appliance is directly generated to close a compressor of the frequency conversion electric appliance. Because the compressor belongs to the part with larger current, after the compressor is closed, the total current value can be reduced effectively, so that other parts of the frequency conversion electric appliance can be maintained to normally operate, for example, an indoor unit (fan) of the air conditioner is maintained to normally operate, and the influence of the change of the working state of the frequency conversion electric appliance on a user is reduced.
Based on the sixth embodiment, in the seventh embodiment of the present invention, after the step of turning off the compressor of the inverter, the method further includes the steps of:
step S331, receiving a manual shutdown instruction;
step S332, when a manual shutdown instruction is received, controlling the frequency conversion electric appliance to be closed;
step S333, when a manual shutdown instruction is not received, acquiring a total current value in the controlled circuit;
step S334, determining a power utilization control area where the total current value is located;
and step S335, controlling the variable frequency electric appliance to resume operation when the total current value is in the normal control area.
In this embodiment, after the compressor of the frequency conversion electric appliance is automatically turned off under the control of the circuit on-off device, in order to reduce the influence on the user as much as possible, the operation of the frequency conversion electric appliance is controlled according to whether a manual shutdown instruction is received. When a manual shutdown instruction is received, the user is indicated that the frequency conversion electric appliance is not required to continue to operate, and the frequency conversion electric appliance is controlled to be turned off at the moment, so that the energy consumption is reduced, and meanwhile, the service life of the frequency conversion electric appliance is prolonged. When the manual shutdown instruction is not received, the user is indicated to need the variable frequency electric appliance to continue to operate, and when the total current value in the controlled circuit is restored to the normal control area, the variable frequency electric appliance is controlled to resume operation so as to meet the user requirement.
Based on the above embodiments, in an eighth embodiment of the present invention, the control method of the circuit on-off device further includes the following steps:
step S410, when an opening instruction of a frequency conversion electric appliance in a controlled circuit is received, acquiring a total current value in the controlled circuit;
step S420, when the total current value is in the breaking prevention control area or the frequency control area, the frequency conversion electric appliance is controlled to be closed, and a prompt signal is generated;
and step S430, controlling the operation of the variable frequency electric appliance when the total current value is in the normal control area.
It should be noted that there is no definite sequence relationship between the steps S410 to S430 and the steps S100 to S300 in the present embodiment. When an opening instruction of the variable frequency electric appliance in the controlled circuit is received, that is, the number of electric appliances running in the controlled circuit may be further increased, in order to ensure the circuit safety, the rising of potential safety hazards of the circuit caused by newly increased electric appliances and even current limiting and power failure are avoided, and the total current value in the controlled circuit in the current state is obtained. When the total current value is in the anti-breaking control area or the frequency control area, the current circuit load is heavy, the frequency conversion electric appliance is controlled to be closed to avoid potential safety hazards, and a prompting signal is generated to prompt a user to pay attention to reducing the circuit load; when the total current value is in the normal control area, the operation state of the controlled circuit is normal, and the operation of the variable frequency electric appliance is controlled to meet the requirements of users.
The invention also provides a circuit on-off device, as shown in fig. 8, the circuit on-off device comprises a current sensing module 100, a memory 200 and a processor 300, wherein: the current sensing module 100 is configured to obtain a total current value in the controlled circuit, where the current sensing module 100 may specifically include a sampling resistor, an amplifying circuit, and an analog-to-digital sampling circuit, and convert a current signal in the controlled circuit into a voltage signal through the sampling resistor, amplify the voltage signal through the amplifying circuit, and then convert the voltage signal into a current sampling value under the action of the analog-to-digital sampling circuit. Further, the circuit switching device further comprises a switching module 400, the switching module 400 is used for controlling the on and off of the circuit switching device, the switching module 400 can comprise a manual switching mechanism and an automatic switching mechanism, a user can control the on and off of a controlled circuit through the manual switching mechanism, and the manual switching mechanism can be a handle type, a knob type or a touch switch type or the like; the automatic on-off mechanism is electrically connected with the processor 300 to automatically control the on-off of the controlled circuit, the automatic on-off mechanism can be controlled electronically, and the electronic automatic on-off mechanism has better accuracy and reliability unlike the traditional air switch which adopts a mechanical or physical principle to control the circuit breaking after the current flows.
Further, the circuit on-off device further includes a communication module 500, where the communication module 500 is configured to transmit a control instruction of the circuit on-off device, so that not only can an instruction be transmitted to an internal circuit where the controlled circuit is located, but also an instruction generated according to related data of the internal circuit can be sent to an external circuit such as a power supply bureau, thereby realizing functions such as remote meter reading. Because the communication distance between the inside and the outside and the application scene have larger difference, different communication modes can be adopted to realize the communication between the inside and the outside. Specifically, the communication module may implement instruction transmission by adopting a wired communication or wireless communication manner, such as 485 communication module, 232 communication module, bluetooth communication module, wi-Fi communication module, and power carrier communication module. In this embodiment, a power carrier communication module is preferably used.
Further, the circuit on-off device further includes a timing module 600, and the timing module 600 is used for accumulating duration.
Further, the circuit on-off device further includes a voltage sensing module 700, a power sensing module 800, and a display module 900, wherein: the voltage sensing module 700 is used for obtaining the power supply voltage of the controlled circuit; the power sensing module 800 is configured to obtain a total power value of the controlled circuit; the display module 900 is configured to display at least one of a total current value, a power supply voltage, a total power value, a total power consumption of the controlled circuit, and an operation state of the circuit switching device, so that the circuit switching device can integrate an electric meter function, so that a user can check the operation state and parameters of the controlled circuit.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200 and performs the following operations:
acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located;
accumulating the accumulated duration of the current interval of the total current value;
and when the accumulated time length is smaller than the circuit breaking delay time length, controlling the circuit on-off device to be conducted, and reducing the running power of at least one electric appliance in the controlled circuit or closing at least one electric appliance in the controlled circuit.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200, and after the operation of accumulating the accumulated duration of the current interval in which the total current value is present, performs the following operations:
and when the accumulated time is longer than or equal to the open-circuit delay time, controlling the circuit on-off device to be turned off so as to cut off the controlled circuit.
The processor 300 invokes a control method of the circuit on-off device stored in the memory 200, obtains a total current value in the controlled circuit, and determines the open-circuit delay time length according to a current interval in which the total current value is currently located, where the operations include:
Acquiring a total current value in the controlled circuit;
when the total current value is in the breaking prevention control area, determining a current interval in which the total current value is located;
determining the breaking delay time length according to the current interval in which the total current value is currently located;
when the total current value is in a frequency control area, the circuit on-off device is controlled to be conducted, and the operation frequency of the variable frequency electric appliance in the controlled circuit is reduced according to the total current value;
when the total current value is in a normal control area, the circuit on-off device is controlled to be conducted, and an electric appliance in the controlled circuit is controlled to normally operate;
wherein the current in the normal control region is less than the current in the frequency control region, and the current in the frequency control region is less than the current in the breakage prevention control region.
The processor 300 invokes a control method of the circuit on-off device stored in the memory 200, and the operation of accumulating the accumulated duration of the current interval of the total current value includes:
when the total current value is in a first current interval, acquiring the change trend of the total current value;
when the total current value is in an ascending trend, comparing the total current value with a first upper limit current of the first current interval;
When the total current value is greater than or equal to the first upper limit current, determining that the total current value rises to a second current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is smaller than the first upper limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a descending trend, comparing the total current value with a first lower limit current of the first current interval;
when the total current value is smaller than the first lower limit current, determining that the total current value is reduced to a third current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is greater than or equal to the first lower limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a stable state, continuously accumulating the accumulated duration of the current interval of the total current value;
the current of the first current section is smaller than the current of the second current section, the current of the third current section is smaller than the current of the first current section, the first upper limit current of the first current section is larger than the first lower limit current of the first current section, the third upper limit current of the third current section is smaller than the second lower limit current of the second current section, and the third upper limit current of the third current section is larger than the first lower limit current of the first current section.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200, wherein a first open-circuit delay time of the first current section is longer than a second open-circuit delay time of the second current section, and a third open-circuit delay time of the third current section is longer than the first open-circuit delay time of the first current section.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200, and the operation of determining the open-circuit delay time length according to the current interval in which the total current value is currently located includes:
comparing the total current value with a preset threshold current;
when the total current value is greater than or equal to a preset threshold current, determining that the breaking delay time length is zero;
wherein the preset threshold current is greater than or equal to a second upper limit current of the second current interval.
The processor 300 invokes a control method of the circuit switching device stored in the memory 200, and when the accumulated time length is less than the open-circuit delay time length, the control of the circuit switching device to be turned on and the operation of reducing the operating power of at least one electric appliance in the controlled circuit or turning off at least one electric appliance in the controlled circuit includes:
When the accumulated time length is smaller than the difference of the open-circuit delay time length and the communication delay time length, generating a frequency-reducing instruction of the frequency-converting electric appliance in the controlled circuit;
acquiring a target operating frequency of the variable frequency electrical appliance according to the frequency reducing instruction;
comparing the target operating frequency with a preset frequency;
when the target operating frequency is smaller than the preset frequency, closing a compressor of the variable frequency electric appliance;
when the target operating frequency is greater than or equal to the preset frequency, controlling the variable frequency electric appliance to operate according to the target operating frequency;
when the cumulative time length is greater than or equal to the difference of the open-circuit delay time length and the communication delay time length, generating a closing instruction of the frequency conversion electric appliance in the controlled circuit;
closing the compressor of the variable frequency electric appliance according to the closing instruction;
the communication delay time is the shortest time required by the frequency reducing instruction or the closing instruction to be transmitted from the circuit on-off device to the frequency conversion electric appliance.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200, and after the operation of turning off the compressor of the inverter, performs the following operations:
Receiving a manual shutdown instruction;
when the manual shutdown instruction is received, the frequency conversion electric appliance is controlled to be closed;
when the manual shutdown instruction is not received, acquiring a total current value in the controlled circuit;
determining a power utilization control area where the total current value is located;
and when the total current value is in a normal control area, controlling the variable frequency electric appliance to resume operation.
The processor 300 invokes a control method of the circuit on-off device stored on the memory 200, and also performs the following operations:
when an opening instruction of a frequency conversion electric appliance in the controlled circuit is received, acquiring a total current value in the controlled circuit;
when the total current value is in an anti-breaking control area or a frequency control area, controlling the frequency conversion electric appliance to be closed, and generating a prompt signal;
and when the total current value is in a normal control area, controlling the operation of the variable frequency electric appliance.
The invention also provides a household appliance which comprises a circuit on-off device, and the specific structure of the circuit on-off device refers to the embodiment, and as the household appliance adopts all the technical schemes of all the embodiments, the household appliance at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here. Specifically, the home appliance may be an air conditioner, a refrigerator, or the like.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (15)
1. The control method of the circuit on-off device is characterized by comprising the following steps of:
acquiring a total current value in a controlled circuit, and determining a breaking delay time according to a current interval in which the total current value is currently located;
accumulating the accumulated duration of the current interval of the total current value;
when the accumulated time length is smaller than the breaking delay time length, the circuit on-off device is controlled to be conducted, and the running power of at least one electric appliance in the controlled circuit is reduced or at least one electric appliance in the controlled circuit is closed;
the step of obtaining the total current value in the controlled circuit and determining the breaking delay time length according to the current interval in which the total current value is currently located comprises the following steps:
acquiring a total current value in the controlled circuit;
when the total current value is in the breaking prevention control area, determining a current interval in which the total current value is located;
Determining the breaking delay time length according to the current interval in which the total current value is currently located;
when the total current value is in a frequency control area, the circuit on-off device is controlled to be conducted, and the operation frequency of the variable frequency electric appliance in the controlled circuit is reduced according to the total current value;
when the total current value is in a normal control area, the circuit on-off device is controlled to be conducted, and an electric appliance in the controlled circuit is controlled to normally operate;
wherein the current in the normal control region is less than the current in the frequency control region, and the current in the frequency control region is less than the current in the breakage prevention control region.
2. The control method of the circuit switching device according to claim 1, wherein after the step of accumulating the accumulated time length in which the total current value is in the present current interval, the control method of the circuit switching device further comprises the steps of:
and when the accumulated time is longer than or equal to the open-circuit delay time, controlling the circuit on-off device to be turned off so as to cut off the controlled circuit.
3. The control method of a circuit on-off device according to claim 1 or 2, wherein the step of accumulating the accumulated time length during which the total current value is in the present current interval includes:
When the total current value is in a first current interval, acquiring the change trend of the total current value;
when the total current value is in an ascending trend, comparing the total current value with a first upper limit current of the first current interval;
when the total current value is greater than or equal to the first upper limit current, determining that the total current value rises to a second current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is smaller than the first upper limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a descending trend, comparing the total current value with a first lower limit current of the first current interval;
when the total current value is smaller than the first lower limit current, determining that the total current value is reduced to a third current interval, clearing and re-accumulating the accumulated duration of the current interval of the total current value;
when the total current value is greater than or equal to the first lower limit current, continuously accumulating the accumulated duration of the current interval of the total current value;
when the total current value is in a stable state, continuously accumulating the accumulated duration of the current interval of the total current value;
The current of the first current section is smaller than the current of the second current section, the current of the third current section is smaller than the current of the first current section, the first upper limit current of the first current section is larger than the first lower limit current of the first current section, the third upper limit current of the third current section is smaller than the second lower limit current of the second current section, and the third upper limit current of the third current section is larger than the first lower limit current of the first current section.
4. A control method of a circuit switching device according to claim 3, wherein a first open-circuit delay time period of the first current section is longer than a second open-circuit delay time period of the second current section, and a third open-circuit delay time period of the third current section is longer than the first open-circuit delay time period of the first current section.
5. A method of controlling a circuit on-off device according to claim 3, wherein the step of determining the off-delay period based on the current interval in which the total current value is present comprises:
comparing the total current value with a preset threshold current;
when the total current value is greater than or equal to a preset threshold current, determining that the breaking delay time length is zero;
Wherein the preset threshold current is greater than or equal to a second upper limit current of the second current interval.
6. The method for controlling a circuit switching device according to claim 1 or 2, wherein the step of controlling the circuit switching device to be turned on and reducing the operating power of at least one electric appliance in the controlled circuit or turning off at least one electric appliance in the controlled circuit when the accumulated time period is smaller than the off delay time period comprises:
when the accumulated time length is smaller than the difference of the open-circuit delay time length and the communication delay time length, generating a frequency-reducing instruction of the frequency-converting electric appliance in the controlled circuit;
acquiring a target operating frequency of the variable frequency electrical appliance according to the frequency reducing instruction;
comparing the target operating frequency with a preset frequency;
when the target operating frequency is smaller than the preset frequency, closing a compressor of the variable frequency electric appliance;
when the target operating frequency is greater than or equal to the preset frequency, controlling the variable frequency electric appliance to operate according to the target operating frequency;
when the cumulative time length is greater than or equal to the difference of the open-circuit delay time length and the communication delay time length, generating a closing instruction of the frequency conversion electric appliance in the controlled circuit;
Closing the compressor of the variable frequency electric appliance according to the closing instruction;
the communication delay time is the shortest time required by the frequency reducing instruction or the closing instruction to be transmitted from the circuit on-off device to the frequency conversion electric appliance.
7. The method of controlling a circuit on-off device according to claim 6, further comprising, after the step of turning off the compressor of the inverter, the steps of:
receiving a manual shutdown instruction;
when the manual shutdown instruction is received, the frequency conversion electric appliance is controlled to be closed;
when the manual shutdown instruction is not received, acquiring a total current value in the controlled circuit;
determining a power utilization control area where the total current value is located;
and when the total current value is in a normal control area, controlling the variable frequency electric appliance to resume operation.
8. The control method of the circuit switching device according to claim 1 or 2, characterized in that the control method of the circuit switching device further comprises the steps of:
when an opening instruction of a frequency conversion electric appliance in the controlled circuit is received, acquiring a total current value in the controlled circuit;
when the total current value is in an anti-breaking control area or a frequency control area, controlling the frequency conversion electric appliance to be closed, and generating a prompt signal;
And when the total current value is in a normal control area, controlling the operation of the variable frequency electric appliance.
9. The circuit switching device is characterized by comprising a current sensing module, a memory, a processor and a control program of the circuit switching device, wherein the control program is stored on the memory and can run on the processor, and the control program comprises the following components:
the current sensing module is used for acquiring a total current value in the controlled circuit;
the control program of the circuit switching device, when executed by the processor, implements the steps of the control method of the circuit switching device as claimed in any one of claims 1 to 8.
10. The circuit switching device of claim 9, further comprising an on-off module to control on and off of the circuit switching device.
11. The circuit switching device of claim 9, further comprising a communication module configured to transmit control commands for the circuit switching device.
12. The circuit switching device of claim 9, further comprising a timing module to accumulate a time duration.
13. The circuit switching device of claim 12, further comprising a voltage sensing module, a power sensing module, and a display module, wherein:
the voltage sensing module is used for acquiring the power supply voltage of the controlled circuit;
the power sensing module is used for acquiring the total power value of the controlled circuit;
the display module is used for displaying at least one of the total current value, the power supply voltage, the total power value, the total power consumption of the controlled circuit and the running state of the circuit on-off device.
14. A household appliance, characterized in that it comprises a circuit switching device as claimed in any one of claims 9 to 13.
15. The home appliance of claim 14, wherein the home appliance comprises an air conditioner or a refrigerator.
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