CN111244885B - Control circuit, control method, air conditioner, and computer-readable storage medium - Google Patents
Control circuit, control method, air conditioner, and computer-readable storage medium Download PDFInfo
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- CN111244885B CN111244885B CN202010060184.6A CN202010060184A CN111244885B CN 111244885 B CN111244885 B CN 111244885B CN 202010060184 A CN202010060184 A CN 202010060184A CN 111244885 B CN111244885 B CN 111244885B
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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
- H02H3/20—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 responsive to excess voltage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control circuit, a control method, an air conditioner and a computer readable storage medium, wherein the control circuit comprises: a first control circuit including a first capacitive element, the first control circuit configured to switch in an alternating current voltage and convert the direct current voltage; a second control circuit including a second capacitive element configured to control an input of the alternating voltage to the first control circuit or to cut off the power supply, the second capacitive element being configured to be capable of withstanding a maximum value of the alternating voltage, a withstand voltage value of the first capacitive element being smaller than a withstand voltage value of the second capacitive element; and the alternating current switch circuit is connected to the input end of the second control circuit and is used for controlling the alternating current voltage to be input to the second control circuit or stopping the alternating current voltage from being input to the second control circuit. By the technical scheme, the voltage resistance of the circuit is improved, and meanwhile, the production cost is effectively controlled.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a control circuit of an air conditioner, a control method of the air conditioner, the air conditioner and a computer readable storage medium.
Background
As shown in fig. 1, the commercial power standard of the domestic electricity in china is 220V, and the indoor electric control and the outdoor electric control of the air conditioner are both provided with a capacitor element with voltage resistance of 450V, but the capacitor element with the commercial power standard of 380V and voltage resistance of 450V in the domestic electricity in china may be damaged by overvoltage.
In the related art, as shown in fig. 2, a developer sets a capacitance element of an indoor electric control and an outdoor electric control to a voltage withstanding of 500V, which increases the production cost of the air conditioner and also increases the layout area of a circuit board.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
In view of the above, an object of the present invention is to provide a control circuit for an air conditioner.
Another object of the present invention is to provide a control method of an air conditioner.
Another object of the present invention is to provide an air conditioner.
It is yet another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, a first aspect of the present invention provides a control circuit for an air conditioner, including: a first control circuit including a first capacitive element, the first control circuit configured to switch in an alternating current voltage and convert the direct current voltage; a second control circuit including a second capacitive element configured to control an input of the alternating voltage to the first control circuit or to cut off the power supply, the second capacitive element being configured to be capable of withstanding a maximum value of the alternating voltage, a withstand voltage value of the first capacitive element being smaller than a withstand voltage value of the second capacitive element; and the alternating current switch circuit is connected to the input end of the second control circuit and is used for controlling the alternating current voltage to be input to the second control circuit or stopping the alternating current voltage from being input to the second control circuit.
In the technical scheme, the first control circuit comprises the first capacitive element, the second control circuit comprises the second capacitive element, the second capacitive element can withstand the maximum alternating current voltage, and the withstand voltage value of the first capacitive element is smaller than that of the second capacitive element, so that the production cost is reduced, the layout area of the first control circuit is reduced, and the withstand voltage performance and the universality of the control circuit of the air conditioner are improved.
In addition, because the withstand voltage value of the first capacitive element is smaller, the alternating current switch circuit is connected to the input end of the second control circuit so as to improve the reliability of the control circuit, and particularly when the alternating current voltage does not exceed the withstand voltage value of the second capacitive element and exceeds the withstand voltage value of the first capacitive element, the alternating current switch circuit can control to stop inputting the alternating current voltage to the second control circuit so as to realize overvoltage protection on the first control circuit and the second control circuit in time.
Specifically, the second control circuit is mainly used for accessing an alternating current signal and driving a small load to operate, such as an indoor fan and an air guide assembly, the second control circuit can also be referred to as indoor electric control for short, the first control circuit is mainly used for driving a large load, such as a compressor and an outdoor fan, and the first control circuit can also be referred to as outdoor electric control for short.
Preferably, the second capacitive element has a withstand voltage of 500V, and the first capacitive element has a withstand voltage of 450V.
In the above technical solution, the first control circuit further includes: and the voltage detection circuit is connected to the first control circuit or the second control circuit and is used for determining the alternating-current voltage and controlling the alternating-current switching circuit to be switched on or switched off according to the alternating-current voltage.
In the technical scheme, the alternating voltage flowing through the first control circuit is directly related to the alternating voltage flowing through the second control circuit, so that the alternating voltage is detected by the voltage detection circuit, the alternating voltage is cut off to be input into the second control circuit when overvoltage is detected, the first control circuit and the second control circuit can be simultaneously subjected to overvoltage protection, and in addition, the setting mode of the voltage detection circuit is more flexible.
In the above technical solution, the voltage detection circuit is integrated in the first control circuit, and configured to detect an ac voltage flowing through the first control circuit, and send the detected ac voltage to the second control circuit, and the voltage detection circuit determines that the detected ac voltage exceeds a voltage threshold, and triggers the ac switch circuit to turn off.
In the technical scheme, the voltage detection circuit is integrated in the first control circuit, namely, the alternating voltage of the first control circuit is detected, and the detection result is sent to the second control circuit for judgment, so that the operation amount and the overvoltage protection efficiency of the first control circuit are reduced.
In the above technical solution, the voltage detection circuit is integrated with the second control circuit, and configured to detect an ac voltage flowing through the second control circuit, and the voltage detection circuit determines that the detected ac voltage exceeds a voltage threshold, and triggers the ac switching circuit to turn off.
In the technical scheme, the voltage detection circuit is integrated in the second control circuit, when the condition that the alternating voltage flowing through the second control circuit is overhigh is detected, the second control circuit can be directly protected, and the first control circuit can continuously operate, so that the overall reliability of the air conditioner is improved.
In the above technical solution, the voltage detection circuit includes: and the first operational amplifier is connected to the transmission line of the alternating voltage, reduces the alternating voltage according to a first preset proportion and transmits the reduced alternating voltage to the second controller.
In the technical scheme, the first operational amplifier is arranged in the voltage detection circuit to reduce the alternating voltage, so that the second controller receives the reduced alternating voltage, meanwhile, the interference of a noise signal to the alternating voltage is reduced, and the reliability and the operational efficiency of the second controller are improved.
In the above technical solution, the voltage detection circuit includes: the rectifier is connected to the transmission line of the alternating voltage and converts the alternating voltage into direct voltage; the input end of the second operational amplifier is connected to the output end of the rectifier and used for reducing the rectified direct-current voltage according to a second preset proportion; and the input end of the processor is connected to the output end of the second operational amplifier, and the processor is configured to amplify the received direct-current voltage according to a second preset proportion and convert the amplified direct-current voltage into alternating-current voltage according to the corresponding relation between the direct-current voltage and the alternating-current voltage.
In the technical scheme, the rectifier is arranged to convert the alternating voltage into the direct voltage, so that the reduction of calculation amount and system fluctuation noise is facilitated, in addition, the direct voltage is reduced through the second operational amplifier, the calculation amount of the processor can be reduced, the withstand voltage requirement on a port of the processor can also be reduced, and the processor can determine the alternating voltage input to the second control circuit only by amplifying the direct voltage according to the second preset proportion.
In the above technical solution, the electric quantity of the first control circuit is configured to drive the first load to operate, the electric quantity of the second control circuit is configured to drive the second load to operate, and the rated power of the first load is greater than the rated power of the second load.
In the technical scheme, the first load can be a compressor and an outdoor fan, the second load can be an indoor fan and an air guide assembly, the rated power of the first load is larger than that of the second load, in order to guarantee reliable operation of the first load, when overvoltage of alternating current voltage is detected, the alternating current switch circuit is triggered to act, and alternating current is reduced so as to reduce the fault rate of the first control circuit.
In addition, for the second control circuit connected with the alternating voltage, the withstand voltage value of the second capacitive element is high enough, so that the second load is hardly impacted by the alternating voltage, and the overall efficiency of the air conditioner is comprehensively improved.
In the above technical solution, a capacitance of the second capacitive element is less than or equal to 100 μ f, and a capacitance of the first capacitive element is greater than or equal to 1000 μ f.
In this solution, the capacity of the second capacitive element is small and is usually less than or equal to 100 μ F because the indoor unit does not have a large power load, and the capacity of the first capacitive element is usually more than 1000 μ F because the outdoor unit usually includes a high-load inverter compressor.
The technical solution of the second aspect of the present invention provides a control method for an air conditioner, the air conditioner includes a second control circuit, a first control circuit and an ac switch circuit, the second control circuit provides an ac voltage to the first control circuit, the first control circuit converts the ac voltage into a dc voltage, the control method includes: determining an alternating voltage flowing through the first control circuit or through the second control circuit; and triggering the AC switch circuit to be switched on or switched off according to the AC voltage, switching on the AC switch circuit, inputting the AC voltage to the second control circuit, switching off the AC switch circuit, and switching off the AC voltage to be input to the second control circuit.
In the technical scheme, the first control circuit comprises the first capacitive element, the second control circuit comprises the second capacitive element, the second capacitive element can withstand the maximum alternating current voltage, and the withstand voltage value of the first capacitive element is smaller than that of the second capacitive element, so that the production cost is reduced, the layout area of the first control circuit is reduced, and the withstand voltage performance and the universality of the control circuit of the air conditioner are improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; and determining that the direct current voltage is greater than a first voltage threshold value, and triggering the alternating current switch circuit to be cut off.
In the technical scheme, the direct-current voltage value is compared with the first voltage threshold, and when the direct-current voltage is greater than the first voltage threshold as a comparison result, the alternating-current switching circuit is immediately triggered to perform first-stage overvoltage protection, and the direct-current voltage is converted from the alternating-current voltage, so that the voltage withstanding characteristics of the first control circuit and the second control circuit can be simultaneously guaranteed by detecting the direct-current voltage.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is smaller than a second voltage threshold value, and triggering the alternating current switch circuit to be conducted.
In the technical scheme, if the direct-current voltage is determined to be less than or equal to the first voltage threshold value and the direct-current voltage is further determined to be less than the second voltage threshold value, the alternating-current switch circuit is triggered to be conducted, that is, the alternating-current voltage is detected to be normal, the first control circuit and the second control circuit can both normally drive the load to operate, so that the operation stability and the continuity of the air conditioner are guaranteed.
The first control circuit is controlled to continuously provide the residual electric quantity for the first load, the direct-current voltage is reduced along with the increase of the power supply duration of the residual electric quantity, the residual electric quantity in the first control circuit is consumed, ripple signals and arc discharge interference caused by stopping the first load immediately are avoided, and the reliability of the control circuit is further improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relation between the direct current voltage and a first voltage threshold value; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is greater than or equal to the second voltage threshold value, and keeping the running states of the first control circuit and the second control circuit.
In the technical scheme, the operation states of the first control circuit and the second control circuit are maintained by determining that the direct current voltage is less than or equal to the first voltage threshold and further determining that the direct current voltage is greater than or equal to the second voltage threshold, so that the operation reliability and stability of the air conditioner are ensured.
An aspect of the invention provides an air conditioner including a control circuit as defined in any one of the preceding claims.
Therefore, the technical effect defined by any one of the technical schemes is achieved, and details are not repeated herein.
An embodiment of the fourth aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the steps of the method for controlling an air conditioner as defined in any of the above embodiments are implemented, so that the technical effects of any of the above embodiments are achieved, and are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic circuit diagram of an air conditioner of the prior art;
FIG. 2 shows a schematic circuit diagram of another prior art air conditioner;
FIG. 3 illustrates a schematic diagram of a control circuit of an air conditioner according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a control method of an air conditioner according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a control method of an air conditioner according to another embodiment of the present invention;
Fig. 6 is a graph illustrating a control scheme of an air conditioner according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram illustrating a control circuit of an air conditioner according to an embodiment of the present invention;
FIG. 8 illustrates a schematic block diagram of an air conditioner according to an embodiment of the present invention;
FIG. 9 shows a schematic block diagram of a computer-readable storage medium according to an embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Some embodiments according to the invention are described below with reference to fig. 3 to 9.
As shown in fig. 3, a control circuit of an air conditioner according to an embodiment of the present invention includes:
A first control circuit including a first capacitive element, the first control circuit configured to switch in an alternating current voltage and convert the direct current voltage; a second control circuit including a second capacitive element configured to control an input of the alternating voltage to the first control circuit or to cut off the power supply, the second capacitive element being configured to be capable of withstanding a maximum value of the alternating voltage, a withstand voltage value of the first capacitive element being smaller than a withstand voltage value of the second capacitive element; and the alternating current switch circuit is connected to the input end of the second control circuit and is used for controlling the alternating current voltage to be input to the second control circuit or stopping the alternating current voltage from being input to the second control circuit.
In the technical scheme, the first control circuit comprises the first capacitive element, the second control circuit comprises the second capacitive element, the second capacitive element can withstand the maximum alternating current voltage, and the withstand voltage value of the first capacitive element is smaller than that of the second capacitive element, so that the production cost is reduced, the layout area of the first control circuit is reduced, and the withstand voltage performance and the universality of the control circuit of the air conditioner are improved.
In addition, because the withstand voltage value of the first capacitive element is smaller, the alternating current switch circuit is connected to the input end of the second control circuit so as to improve the reliability of the control circuit, and particularly when the alternating current voltage does not exceed the withstand voltage value of the second capacitive element and exceeds the withstand voltage value of the first capacitive element, the alternating current switch circuit can control to stop inputting the alternating current voltage to the second control circuit so as to realize overvoltage protection on the first control circuit and the second control circuit in time.
Specifically, the second control circuit is mainly used for accessing alternating current signals and driving small loads to operate, such as an indoor fan and an air guide assembly, the second control circuit can also be called as indoor electric control for short, the first control circuit is mainly used for driving large loads, such as a compressor and an outdoor fan, and the first control circuit can also be called as outdoor electric control for short.
Preferably, the second capacitive element has a withstand voltage of 500V and the first capacitive element has a withstand voltage of 450V.
In the above technical solution, the first control circuit further includes: and the voltage detection circuit is connected to the first control circuit or the second control circuit and is used for determining the alternating-current voltage and controlling the alternating-current switching circuit to be switched on or switched off according to the alternating-current voltage.
In the technical scheme, the alternating voltage flowing through the first control circuit is directly related to the alternating voltage flowing through the second control circuit, so that the alternating voltage is detected by the voltage detection circuit, the alternating voltage is cut off to be input into the second control circuit when overvoltage is detected, the first control circuit and the second control circuit can be simultaneously subjected to overvoltage protection, and in addition, the setting mode of the voltage detection circuit is more flexible.
In the above technical solution, the voltage detection circuit is integrated in the first control circuit, and configured to detect an ac voltage flowing through the first control circuit, and send the detected ac voltage to the second control circuit, and the voltage detection circuit determines that the detected ac voltage exceeds a voltage threshold, and triggers the ac switch circuit to turn off.
In the technical scheme, the voltage detection circuit is integrated in the first control circuit, namely, the alternating voltage of the first control circuit is detected, and the detection result is sent to the second control circuit for judgment, so that the operation amount and the overvoltage protection efficiency of the first control circuit are reduced.
In the above technical solution, the voltage detection circuit is integrated with the second control circuit, and configured to detect an ac voltage flowing through the second control circuit, and the voltage detection circuit determines that the detected ac voltage exceeds a voltage threshold, and triggers the ac switching circuit to turn off.
In the technical scheme, the voltage detection circuit is integrated in the second control circuit, when the condition that the alternating voltage flowing through the second control circuit is overhigh is detected, the second control circuit can be directly protected, and the first control circuit can continuously operate, so that the overall reliability of the air conditioner is improved.
In the above technical solution, the voltage detection circuit includes: the first operational amplifier is connected to the transmission line of the alternating voltage, reduces the alternating voltage according to a first preset proportion and transmits the reduced alternating voltage to the second controller.
In the technical scheme, the first operational amplifier is arranged in the voltage detection circuit to reduce the alternating voltage, so that the second controller receives the reduced alternating voltage, meanwhile, the interference of a noise signal to the alternating voltage is reduced, and the reliability and the operational efficiency of the second controller are improved.
In the above technical solution, the voltage detection circuit includes: the rectifier is connected to the transmission line of the alternating voltage and converts the alternating voltage into direct voltage; the input end of the second operational amplifier is connected to the output end of the rectifier and used for reducing the rectified direct-current voltage according to a second preset proportion; and the input end of the processor is connected to the output end of the second operational amplifier, and the processor is configured to amplify the received direct-current voltage according to a second preset proportion and convert the amplified direct-current voltage into alternating-current voltage according to the corresponding relation between the direct-current voltage and the alternating-current voltage.
In the technical scheme, the rectifier is arranged to convert the alternating voltage into the direct voltage, so that the reduction of calculation amount and system fluctuation noise is facilitated, in addition, the direct voltage is reduced through the second operational amplifier, the calculation amount of the processor can be reduced, the withstand voltage requirement on a port of the processor can also be reduced, and the processor can determine the alternating voltage input to the second control circuit only by amplifying the direct voltage according to the second preset proportion.
In the above technical solution, the electric quantity of the first control circuit is configured to drive the first load to operate, the electric quantity of the second control circuit is configured to drive the second load to operate, and the rated power of the first load is greater than the rated power of the second load.
In the technical scheme, the first load can be a compressor and an outdoor fan, the second load can be an indoor fan and an air guide assembly, the rated power of the first load is larger than that of the second load, in order to guarantee reliable operation of the first load, when the overvoltage of the alternating current voltage is detected, the alternating current switch circuit is triggered to act, and the alternating current is reduced so as to reduce the fault rate of the first control circuit.
In addition, for the second control circuit connected with the alternating voltage, the withstand voltage value of the second capacitive element is high enough, so that the second load is hardly impacted by the alternating voltage, and the overall efficiency of the air conditioner is comprehensively improved.
In the above technical solution, a capacitance of the second capacitive element is less than or equal to 100 μ f, and a capacitance of the first capacitive element is greater than or equal to 1000 μ f.
In this solution, the capacity of the second capacitive element is small and is usually less than or equal to 100 μ F because the indoor unit does not have a large power load, and the capacity of the first capacitive element is usually more than 1000 μ F because the outdoor unit usually includes a high-load inverter compressor.
As shown in fig. 4, a control method of an air conditioner according to an embodiment of the present invention includes:
in step S402, an ac voltage flowing through the first control circuit or the second control circuit is determined.
And step S404, triggering the AC switch circuit to be switched on or switched off according to the AC voltage, switching on the AC switch circuit, inputting the AC voltage to the second control circuit, switching off the AC switch circuit, and switching off the AC voltage to be input to the second control circuit.
In the technical scheme, the first control circuit comprises the first capacitive element, the second control circuit comprises the second capacitive element, the second capacitive element can withstand the maximum alternating current voltage, and the withstand voltage value of the first capacitive element is smaller than that of the second capacitive element, so that the production cost is reduced, the layout area of the first control circuit is reduced, and the withstand voltage performance and the universality of the control circuit of the air conditioner are improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; and determining that the direct current voltage is greater than a first voltage threshold value, and triggering the alternating current switch circuit to be cut off.
In the technical scheme, the direct-current voltage value is compared with the first voltage threshold, and when the direct-current voltage is greater than the first voltage threshold as a comparison result, the alternating-current switching circuit is immediately triggered to perform first-stage overvoltage protection, and the direct-current voltage is converted from the alternating-current voltage, so that the voltage withstanding characteristics of the first control circuit and the second control circuit can be simultaneously guaranteed by detecting the direct-current voltage.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is smaller than a second voltage threshold value, and triggering the alternating current switch circuit to be conducted.
In the technical scheme, if the direct-current voltage is determined to be less than or equal to the first voltage threshold value and the direct-current voltage is further determined to be less than the second voltage threshold value, the alternating-current switch circuit is triggered to be conducted, that is, the alternating-current voltage is detected to be normal, the first control circuit and the second control circuit can both normally drive the load to operate, so that the operation stability and the continuity of the air conditioner are guaranteed.
The first control circuit is controlled to continuously provide the residual electric quantity for the first load, the direct-current voltage is reduced along with the increase of the power supply duration of the residual electric quantity, the residual electric quantity in the first control circuit is consumed, ripple signals and arc discharge interference caused by stopping the first load immediately are avoided, and the reliability of the control circuit is further improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is greater than or equal to the second voltage threshold value, and keeping the running states of the first control circuit and the second control circuit.
In the technical scheme, the operation states of the first control circuit and the second control circuit are maintained by determining that the direct current voltage is less than or equal to the first voltage threshold and further determining that the direct current voltage is greater than or equal to the second voltage threshold, so that the operation reliability and stability of the air conditioner are ensured.
As shown in fig. 5 and 6, a control method of an air conditioner according to an embodiment of the present invention includes:
And step S502, detecting the alternating voltage of the input power supply by the indoor electric control of the air conditioner.
Step S504 is performed to determine whether the ac voltage is greater than the first voltage threshold, if so, step S506 is performed, and if not, step S508 is performed.
Step S508, determining whether the ac voltage is smaller than the second voltage threshold, if yes, performing step S510, and if not, performing step S512.
Step S506, the air conditioner enters a high voltage protection area, and the advanced high voltage protection is an embodiment of the first level overvoltage protection: 1. disconnecting an outdoor electrically controlled power supply line; 2. and displaying voltage and high voltage information.
Step S510, the air conditioner exits the high voltage protection area: 1. conducting an outdoor electric control power supply line; 2. exiting from displaying the voltage high-voltage information; 3. the air conditioner resumes normal operation.
And step S512, keeping the running state of the air conditioner unchanged.
The indoor unit is provided with a high-power load, the capacity of a capacitive element is smaller and is generally 100 microfarads, the outdoor high load comprises a variable frequency compressor, an outdoor fan and the like, and the capacity of the capacitive element is generally more than 1000 microfarads.
Upgrading a capacitive element of the indoor unit to a 500V withstand voltage specification, detecting an alternating current voltage value indoors, disconnecting an outdoor power supply through indoor electronic control when the alternating current voltage value is detected to be higher than a first voltage threshold value, implementing high voltage protection, reminding a user of high voltage abnormity through indoor electronic control, and recovering the normal work of the air conditioner when the alternating current voltage value is detected to be lower than a second voltage threshold value, wherein the recommended value of the voltage threshold value is 300V.
As shown in fig. 7, a specific embodiment of obtaining the dc voltage is as follows:
the capacitive element of the indoor unit is upgraded to a 500V withstand voltage specification, the voltage value of a direct current bus is detected in an outdoor electronic control mode, alternating current voltage is input for detection, and the alternating current voltage can be directly reduced for detection, or the alternating current voltage is converted into direct current voltage through an AC-DC rectifier (the existing circuit does not need to be improved), the direct current voltage is reduced to be within the detection range of a processor MCU (microprogrammed control unit) through a voltage-dividing resistor in a certain proportion and then detected, actual direct current voltage Udc is calculated in a proportion, and finally the alternating current voltage is calculated according to the proportional relation between the alternating current voltage and the direct current voltage, namely the relation of 2 times of root number.
The direct current signal output by the rectifier is loaded to a load through the electrolytic capacitor C, and the negative electrode of the electrolytic capacitor is grounded.
The detection circuit comprises a comparator, one path of signal of the alternating current voltage AC is input to a first end of the comparator through a first resistor R1 and a third resistor R3, the other path of signal of the alternating current voltage AC is subjected to current limiting through a second resistor R2, and is input to a second end of the comparator after being subjected to voltage division through a fourth resistor R4 and a fifth resistor R5 (one end of a fourth resistor R4 is connected with a direct current source VCC), namely the output signal of the comparator reflects whether the alternating current voltage AC exceeds a corresponding voltage threshold value, and overvoltage protection and overvoltage prompt are triggered.
As shown in fig. 8, an embodiment of the present invention discloses an air conditioner 800, which includes the control circuit 802 defined in any of the above embodiments, so that the technical effects of any of the above embodiments are achieved, and are not repeated herein.
As shown in fig. 9, an embodiment of the present invention also provides a computer-readable storage medium 900. The computer program 902 is stored thereon, and when executed, the computer program 902 implements the control method of the air conditioner defined in any of the above embodiments, so that the technical effects of any of the above embodiments are achieved, and are not described herein again.
In this embodiment, the computer program 902, when executed by a processor, implements the steps of:
determining an alternating voltage flowing through the first control circuit or through the second control circuit; and triggering the AC switch circuit to be switched on or switched off according to the AC voltage, switching on the AC switch circuit, inputting the AC voltage to the second control circuit, switching off the AC switch circuit, and switching off the AC voltage to be input to the second control circuit.
In the technical scheme, the first control circuit comprises the first capacitive element, the second control circuit comprises the second capacitive element, the second capacitive element can withstand the maximum alternating current voltage, and the withstand voltage value of the first capacitive element is smaller than that of the second capacitive element, so that the production cost is reduced, the layout area of the first control circuit is reduced, and the withstand voltage performance and the universality of the control circuit of the air conditioner are improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; and determining that the direct current voltage is greater than a first voltage threshold value, and triggering the alternating current switch circuit to be cut off.
In the technical scheme, the direct-current voltage value is compared with the first voltage threshold, and when the direct-current voltage is greater than the first voltage threshold as a comparison result, the alternating-current switching circuit is immediately triggered to perform first-stage overvoltage protection, and the direct-current voltage is converted from the alternating-current voltage, so that the voltage withstanding characteristics of the first control circuit and the second control circuit can be simultaneously guaranteed by detecting the direct-current voltage.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relationship between the direct current voltage and a first voltage threshold; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is smaller than a second voltage threshold value, and triggering the alternating current switch circuit to be conducted.
In the technical scheme, if the direct-current voltage is determined to be less than or equal to the first voltage threshold value and the direct-current voltage is further determined to be less than the second voltage threshold value, the alternating-current switch circuit is triggered to be conducted, that is, the alternating-current voltage is detected to be normal, the first control circuit and the second control circuit can both normally drive the load to operate, so that the operation stability and the continuity of the air conditioner are guaranteed.
The first control circuit is controlled to continuously provide the residual electric quantity for the first load, the direct-current voltage is reduced along with the increase of the power supply duration of the residual electric quantity, the residual electric quantity in the first control circuit is consumed, ripple signals and arc discharge interference caused by stopping the first load immediately are avoided, and the reliability of the control circuit is further improved.
In the above technical solution, triggering the ac switch circuit to turn on or off according to the ac voltage specifically further includes: comparing the magnitude relation between the direct current voltage and a first voltage threshold value; determining that the direct current voltage is less than or equal to a first voltage threshold value, and comparing the magnitude relation between the direct current voltage and a second voltage threshold value; and determining that the direct current voltage is greater than or equal to the second voltage threshold value, and keeping the running states of the first control circuit and the second control circuit.
In the technical scheme, the operation states of the first control circuit and the second control circuit are maintained by determining that the direct current voltage is less than or equal to the first voltage threshold and further determining that the direct current voltage is greater than or equal to the second voltage threshold, so that the operation reliability and stability of the air conditioner are ensured.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A control circuit of an air conditioner, the control circuit comprising:
a first control circuit comprising a first capacitive element, the first control circuit configured to switch in an alternating voltage and convert a direct voltage;
a second control circuit including a second capacitive element configured to control the ac voltage to be input to the first control circuit or to cut off power supply, the second capacitive element being configured to be capable of withstanding a maximum value of the ac voltage, a withstand voltage value of the first capacitive element being smaller than a withstand voltage value of the second capacitive element;
the alternating current switch circuit is connected to the input end of the second control circuit and is used for controlling the alternating current voltage to be input to the second control circuit or stopping the alternating current voltage from being input to the second control circuit;
the first control circuit is configured to drive a first load to operate, the second control circuit is configured to drive a second load to operate, and the rated power of the first load is larger than that of the second load.
2. The control circuit of an air conditioner according to claim 1, further comprising:
And the voltage detection circuit is connected to the first control circuit or the second control circuit and is used for determining the alternating-current voltage and controlling the alternating-current switch circuit to be switched on or switched off according to the alternating-current voltage.
3. The control circuit of an air conditioner according to claim 1 or 2,
the voltage detection circuit is integrated in the first control circuit and used for detecting the alternating voltage flowing through the first control circuit and sending the detected alternating voltage to the second control circuit, and the voltage detection circuit determines that the detected alternating voltage exceeds a voltage threshold value and triggers the alternating current switch circuit to be cut off.
4. The control circuit of an air conditioner according to claim 1 or 2,
the voltage detection circuit is integrated with the second control circuit and used for detecting the alternating-current voltage flowing through the second control circuit, and the voltage detection circuit determines that the detected alternating-current voltage exceeds a voltage threshold value and triggers the alternating-current switch circuit to be switched off.
5. The control circuit of an air conditioner according to claim 1 or 2, wherein the voltage detection circuit includes:
The first operational amplifier is connected to the transmission line of the alternating voltage, reduces the alternating voltage according to a first preset proportion, and transmits the reduced alternating voltage to the second controller.
6. The control circuit of an air conditioner according to claim 1 or 2, wherein the voltage detection circuit includes:
a rectifier that is connected to the transmission line of the alternating voltage and converts the alternating voltage into a direct voltage;
the input end of the second operational amplifier is connected to the output end of the rectifier and used for reducing the rectified direct-current voltage according to a second preset proportion;
a processor, an input end of the processor being connected to an output end of the second operational amplifier, the processor being configured to amplify the received dc voltage according to the second preset ratio and convert the amplified dc voltage into an ac voltage according to a correspondence between the dc voltage and the ac voltage.
7. The control circuit of an air conditioner according to claim 1 or 2,
the capacitance of the second capacitive element is less than or equal to 100 μ f, and the capacitance of the first capacitive element is greater than or equal to 1000 μ f.
8. A control method of an air conditioner, the air conditioner comprising a first control circuit, a second control circuit and an ac switching circuit electrically connected, the second control circuit supplying an ac voltage to the first control circuit, the first control circuit converting the ac voltage into a dc voltage, the control method comprising:
determining an alternating voltage flowing through the first control circuit or through the second control circuit;
triggering the alternating current switch circuit to be switched on or switched off according to the alternating current voltage, switching on the alternating current switch circuit, inputting the alternating current voltage to the second control circuit, switching off the alternating current switch circuit, and switching off and inputting the alternating current voltage to the second control circuit; the first control circuit is configured to drive a first load to operate, the second control circuit is configured to drive a second load to operate, and the rated power of the first load is larger than that of the second load.
9. The method for controlling an air conditioner according to claim 8, wherein triggering the ac switching circuit to turn on or off according to the ac voltage specifically comprises:
Comparing the magnitude relationship between the direct current voltage and a first voltage threshold;
and determining that the direct current voltage is greater than the first voltage threshold value, and triggering the alternating current switch circuit to be cut off.
10. The method for controlling an air conditioner according to claim 8, wherein triggering the ac switching circuit to turn on or off according to the ac voltage further includes:
comparing the magnitude relationship between the direct current voltage and a first voltage threshold;
determining that the direct current voltage is less than or equal to the first voltage threshold, and comparing the magnitude relation between the direct current voltage and a second voltage threshold;
and determining that the direct current voltage is smaller than the second voltage threshold value, and triggering the alternating current switch circuit to be conducted.
11. The method for controlling an air conditioner according to claim 8, wherein triggering the ac switching circuit to turn on or off according to the ac voltage further includes:
comparing the magnitude relationship between the direct current voltage and a first voltage threshold;
determining that the direct current voltage is less than or equal to the first voltage threshold, and comparing the magnitude relation between the direct current voltage and a second voltage threshold;
and determining that the direct current voltage is greater than or equal to the second voltage threshold, and keeping the running states of the first control circuit and the second control circuit.
12. An air conditioner, comprising:
the control circuit of an air conditioner according to any one of claims 1 to 7.
13. A computer-readable storage medium on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the control method of the air conditioner according to any one of claims 8 to 11.
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| CN202010060184.6A CN111244885B (en) | 2020-01-19 | 2020-01-19 | Control circuit, control method, air conditioner, and computer-readable storage medium |
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| CN202010060184.6A CN111244885B (en) | 2020-01-19 | 2020-01-19 | Control circuit, control method, air conditioner, and computer-readable storage medium |
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| CN112670956B (en) * | 2021-01-18 | 2023-08-04 | 佛山市顺德区美的电子科技有限公司 | Overvoltage protection method and device for air conditioner and air conditioner |
| CN115250057A (en) * | 2021-04-26 | 2022-10-28 | 佛山市顺德区美的电子科技有限公司 | Control method and device for electronic equipment, electronic equipment and computer storage medium |
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