CN113685963B - Air conditioner purification control circuit and air conditioner - Google Patents
Air conditioner purification control circuit and air conditioner Download PDFInfo
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- CN113685963B CN113685963B CN202010426526.1A CN202010426526A CN113685963B CN 113685963 B CN113685963 B CN 113685963B CN 202010426526 A CN202010426526 A CN 202010426526A CN 113685963 B CN113685963 B CN 113685963B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner purifying control circuit and an air conditioner, wherein the circuit comprises a micro control unit MCU, a strong field dielectric IFD control unit and a negative ion control unit, and the IFD control unit further comprises: the device comprises a main control unit, an overcurrent protection unit and a circuit breaking alarm unit, wherein the first end of the main control unit is connected with a first IO port of the MCU, the second end of the main control unit is respectively connected with the first end of the overcurrent protection unit and the first end of the circuit breaking alarm unit, the second end of the overcurrent protection unit is connected with a second IO port of the MCU, and the second end of the circuit breaking alarm unit is connected with a third IO port of the MCU, so that short circuit protection and circuit breaking monitoring can be carried out, and the reliability of an IFD module and an anion module can be controlled.
Description
Technical Field
The present application relates to the field of air conditioning control, and more particularly, to an air conditioning purification control circuit and an air conditioner.
Background
The requirements of the current market on purifying and sterilizing functions are increasingly strict, and an IFD (Intense field dielectric ) module and an anion module can realize efficient purification and sterilization, the purification rate reaches more than 99%, and the sterilization rate reaches more than 99%. Meanwhile, the wind resistance at the same wind speed is more than 200% smaller than that of a common H11 efficient filter screen, so that the performance and the whole energy efficiency of the fan are greatly improved, and the fan can be washed and recycled.
However, since both the IFD module and the negative ion module are based on the high voltage discharge principle, EMI (Electromagnetic Interference ) is easily generated. Because IFD module needs periodic cleaning, adopts portable buckle formula power supply mode, has the contact to be bad and arouses the risk of circuit breaking, again because there is cold and hot air mixing in the air outlet position, the comdenstion water problem exists the condition of short circuit.
Therefore, how to provide an air conditioner purifying control circuit capable of effectively monitoring short-circuit faults and open-circuit faults, so that the reliability of the control IFD module and the anion module is improved, and the technical problem to be solved at present is solved.
Disclosure of Invention
The invention provides an air conditioner purifying control circuit which is used for solving the technical problems that in the prior art, when an IFD module and an anion module are controlled, open circuit or short circuit is easy to generate, and the reliability of the IFD module and the anion module is not high.
In some embodiments of the present application, the circuit includes a micro control unit MCU, a strong field dielectric IFD control unit, and a negative ion control unit, the IFD control unit further including: a main control unit, an overcurrent protection unit and a circuit breaking alarm unit, wherein,
the first end of the main control unit is connected with the first IO port of the MCU, the second end of the main control unit is respectively connected with the first end of the overcurrent protection unit and the first end of the open circuit alarm unit, the second end of the overcurrent protection unit is connected with the second IO port of the MCU, and the second end of the open circuit alarm unit is connected with the third IO port of the MCU;
the main control unit is used for receiving a control instruction of the MCU through the first IO port and controlling the IFD module according to the control instruction;
the overcurrent protection unit is used for monitoring the current of the IFD module and sending a first low-level signal to the MCU through the second IO port when the current exceeds a first preset threshold value so as to enable the MCU to cut off the power supply of the IFD module;
and the circuit breaking alarm unit is used for monitoring the current and sending a second low-level signal to the MCU through the third IO port when the current is smaller than a second preset threshold value so that the MCU sends out a circuit breaking alarm signal.
In some embodiments of the present application, the main control unit further comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an optocoupler, and a switching transistor, wherein,
the first end of the first resistor is the first end of the main control unit, the second end of the first resistor and the first end of the second resistor are connected to the base electrode of the switch triode in a sharing mode, the common contact point of the second end of the second resistor and the emitter electrode of the switch triode is grounded, the collector electrode of the switch triode and the first end of the fourth resistor are connected to the cathode of the light emitting diode of the optocoupler in a sharing mode, the second end of the fourth resistor and the first end of the third resistor are connected to the anode of the light emitting diode of the optocoupler in a sharing mode, the second end of the third resistor is connected with a first direct current power supply, the emitter electrode of the phototriode of the optocoupler is connected with the second end of the IFD module, the collector electrode of the phototriode of the optocoupler is sequentially connected with the first end of the fifth resistor and the second end of the main control unit, and the first end of the fifth resistor is connected with a second direct current power supply.
In some embodiments of the present application, the main control unit further comprises a first capacitor and a second capacitor, wherein,
the common connection point of the first end of the first capacitor and the second end of the fifth resistor is connected with the second direct current power supply, the first end of the second capacitor is connected with the collector electrode of the phototriode of the optocoupler, and the second end of the first capacitor and the second end of the second capacitor are grounded.
In some embodiments of the present application, the over-current protection unit further includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first comparator, and a third capacitor, wherein,
the first end of the sixth resistor is the first end of the overcurrent protection unit, the second end of the sixth resistor is connected with the positive input end of the first comparator, the first end of the seventh resistor is connected with the second direct current power supply, the second end of the seventh resistor and the first end of the eighth resistor are commonly connected with the negative input end of the first comparator, the common connection point of the positive input end of the first comparator and the first end of the third capacitor is connected with the first direct current power supply, the common connection point of the output end of the first comparator and the first end of the ninth resistor is connected with the second end of the overcurrent protection unit, the second end of the eighth resistor, the negative input end of the first comparator and the second end of the third capacitor are all grounded.
In some embodiments of the present application, the disconnection warning unit further comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second comparator, and a fourth capacitor, wherein,
the first end of the tenth resistor is the first end of the disconnection alarming unit, the second end of the tenth resistor is connected with the negative input end of the second comparator, the first end of the eleventh resistor is connected with the second direct current power supply, the second end of the eleventh resistor and the first end of the twelfth resistor are commonly connected with the positive input end of the second comparator, the common connection point of the negative input end of the second comparator and the first end of the fourth capacitor is connected with the first direct current power supply, the common connection point of the output end of the second comparator and the first end of the thirteenth resistor is connected with the second end of the disconnection alarming unit, the second end of the thirteenth resistor, the positive input end of the second comparator and the second end of the fourth capacitor are all grounded.
In some embodiments of the present application, the main control unit further comprises a fifth capacitor and a sixth capacitor, wherein,
the first end of the fifth capacitor is connected with the second direct current power supply, the first end of the sixth capacitor is connected with the first direct current power supply, and the second end of the fifth capacitor and the second end of the sixth capacitor are grounded.
In some embodiments of the present application, the negative ion control unit further comprises a first relay and a second relay, wherein,
the first input end of the first relay is connected with the fourth IO port of the MCU, the first output end of the first relay is connected with the first end of the coil of the second relay, the second end of the coil of the second relay is grounded, the first end of the switch of the second relay is connected with the phase line, the second end of the switch of the second relay is connected with the first end of the negative ion module, and the second end of the negative ion module is connected with the zero line.
In some embodiments of the present application, the first relay further comprises a seventh capacitor and an eighth capacitor, wherein,
the first end of the seventh capacitor is connected with the first input end of the first relay, the second end of the seventh capacitor is grounded, the second output end of the first relay and the second end of the eighth capacitor are commonly connected with the second direct current power supply, and the common contact point between the second input end of the first relay and the first end of the eighth capacitor is grounded.
Corresponding to the air conditioner purifying control circuit in the embodiment of the application, the embodiment of the application also provides an air conditioner, including the air conditioner purifying control circuit as described above, further including:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the indoor coil temperature.
Through the application of the technical scheme, the air conditioner purifying control circuit comprises a micro control unit MCU, a strong field dielectric IFD control unit and a negative ion control unit, wherein the IFD control unit further comprises: the device comprises a main control unit, an overcurrent protection unit and a circuit breaking alarm unit, wherein the first end of the main control unit is connected with a first IO port of an MCU, the second end of the main control unit is respectively connected with the first end of the overcurrent protection unit and the first end of the circuit breaking alarm unit, the second end of the overcurrent protection unit is connected with a second IO port of the MCU, the second end of the circuit breaking alarm unit is connected with a third IO port of the MCU, an optocoupler is arranged in the main control unit, a control end and a power supply end of an IFD module are isolated, a first relay is arranged in an anion control unit, an anion module is driven in an isolated mode, the influence of the IFD module and the anion module on the MCU is reduced, and the IFD module can be subjected to short-circuit protection and circuit breaking monitoring through the arrangement of a current sampling resistor and the overcurrent protection unit, so that the reliability of the IFD module and the anion module is improved, and the purification and sterilization effects of an air conditioner are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram showing an outline of a configuration of an air conditioner according to an embodiment.
Fig. 2 is a schematic diagram showing a structure of an air conditioner purifying control circuit in an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of an IFD control unit according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an anion control unit in an embodiment of the present invention.
Description of the reference numerals
1: an air conditioner; 2: an outdoor unit; 3: an indoor unit; 10: a refrigerant circuit; 11: a compressor; 12: a four-way valve; 13: an outdoor heat exchanger;
14: an expansion valve; 16: an indoor heat exchanger; 21: an outdoor fan; 31: an indoor fan; 32: an indoor temperature sensor; 33: an indoor heat exchanger temperature sensor.
Detailed Description
The following description of the embodiments of the present application 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, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
The air conditioner in this application performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies a refrigerant to the air that has been conditioned and heat exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
Fig. 1 shows a circuit configuration of an air conditioner 1, and the air conditioner 1 includes a refrigerant circuit 10, and is capable of performing a vapor compression refrigeration cycle by circulating a refrigerant in the refrigerant circuit 10. The indoor unit 3 and the outdoor unit 2 are connected to each other by a connection pipe 4 to form a refrigerant circuit 10 through which a refrigerant circulates. The refrigerant circuit 10 includes a compressor 11, an outdoor heat exchanger 13, an expansion valve 14, a receiver 15, and an indoor heat exchanger 16. The indoor heat exchanger 16 and the outdoor heat exchanger 13, among others, function as a condenser or an evaporator. The compressor 11 sucks in refrigerant from the suction port, and discharges the refrigerant compressed therein to the indoor heat exchanger 16 from the discharge port. The compressor 11 is an inverter compressor of variable capacity that performs rotational speed control based on an inverter, and the four-way valve 12 switches between heating and cooling.
The outdoor heat exchanger 13 has a first inlet and outlet for passing the refrigerant between the outdoor heat exchanger and the suction port of the compressor 11 via the accumulator 15, and has a second inlet and outlet for passing the refrigerant between the outdoor heat exchanger and the expansion valve 14. The outdoor heat exchanger 13 exchanges heat between the outdoor air and the refrigerant flowing through a heat transfer tube (not shown) connected between the second inlet and the first inlet of the outdoor heat exchanger 13.
The expansion valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 has a function of expanding and decompressing the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 16. The expansion valve 14 is configured to be capable of changing the opening degree, and the opening degree is reduced to increase the flow resistance of the refrigerant passing through the expansion valve 14, and the opening degree is increased to decrease the flow resistance of the refrigerant passing through the expansion valve 14. The expansion valve 14 expands and decompresses the refrigerant flowing from the indoor heat exchanger 16 to the outdoor heat exchanger 13 during the heating operation. Further, even if the state of other devices mounted in the refrigerant circuit 10 does not change, when the opening degree of the expansion valve 14 changes, the flow rate of the refrigerant flowing in the refrigerant circuit 10 changes.
The indoor heat exchanger 16 has a second inlet and outlet for allowing the liquid refrigerant to flow between the expansion valve 14 and a first inlet and outlet for allowing the gas refrigerant to flow between the gas refrigerant and the discharge port of the compressor 11. The indoor heat exchanger 16 exchanges heat between the indoor air and the refrigerant flowing through the heat transfer tube connected between the second inlet and the first inlet of the indoor heat exchanger 16.
A receiver 15 is disposed between the outdoor heat exchanger 13 and the suction port of the compressor 11. In the accumulator 15, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into a gas refrigerant and a liquid refrigerant. The gas refrigerant is mainly supplied from the accumulator 15 to the suction port of the compressor 11.
The outdoor unit 2 further includes an outdoor fan 21, and the outdoor fan 21 generates an airflow of the outdoor air passing through the outdoor heat exchanger 13 to promote heat exchange between the refrigerant flowing through the heat transfer tubes and the outdoor air. The outdoor fan 21 is driven by an outdoor fan motor 21A capable of changing the rotational speed. The indoor unit 3 further includes an indoor fan 31, and the indoor fan 31 generates an airflow of the indoor air passing through the indoor heat exchanger 16 to promote heat exchange between the indoor air and the refrigerant flowing through the heat transfer pipe. The indoor fan 31 is driven by an indoor fan motor 31A capable of changing the rotational speed.
As described in the background art, faults such as open circuit or short circuit are easy to generate when the IFD module and the anion module are controlled in the prior art, so that the technical problem of low reliability of the IFD module and the anion module is caused.
To solve the above-mentioned problem, the embodiment of the application provides an air conditioner purification control circuit, including little control unit MCU, strong field dielectric IFD control unit and anion control unit, IFD control unit still includes: the main control unit, the overcurrent protection unit and the open-circuit alarm unit can perform short-circuit protection and open-circuit monitoring, and the reliability of the control IFD module and the anion module is improved.
As shown in fig. 2, the air conditioner purifying control circuit includes a micro control unit MCU300, a strong field dielectric IFD control unit 100, and a negative ion control unit 200, the IFD control unit 100 further includes: a main control unit 101, an overcurrent protection unit 102, and a disconnection warning unit 103, wherein,
a first end of the main control unit 101 is connected to a first IO port IO1 of the MCU300, a second end of the main control unit 101 is connected to a first end of the overcurrent protection unit 102 and a first end of the disconnection alarm unit 103, a second end of the overcurrent protection unit 102 is connected to a second IO port IO2 of the MCU300, and a second end of the disconnection alarm unit 103 is connected to a third IO port IO3 of the MCU 300;
the main control unit 101 is configured to receive a control instruction of the MCU300 through the first IO port IO1, and control an IFD module according to the control instruction;
the overcurrent protection unit 102 is configured to monitor a current of the IFD module, and send a first low-level signal to the MCU300 through the second IO port IO2 when the current exceeds a first preset threshold, so that the MCU300 cuts off a power supply of the IFD module;
the disconnection warning unit 103 is configured to monitor the current, and send a second low level signal to the MCU300 through the third IO port IO3 when the current is less than a second preset threshold, so that the MCU300 sends a disconnection warning signal.
In order to prevent EMI from being generated by the negative high voltage of the IFD module, in a preferred embodiment of the present application, as shown in fig. 3, the main control unit 101 further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, an optocoupler B1, and a switching transistor V1, wherein,
the first end of the first resistor R1 is the first end of the main control unit 101, the second end of the first resistor R1 and the first end of the second resistor R2 are commonly connected to the base of the switching triode V1, the common junction of the second end of the second resistor R2 and the emitter of the switching triode V1 is grounded, the collector of the switching triode V1 and the first end of the fourth resistor R4 are commonly connected to the cathode of the light emitting diode of the optocoupler B1, the second end of the fourth resistor R4 and the first end of the third resistor R3 are commonly connected to the anode of the light emitting diode of the optocoupler B1, the second end of the third resistor R3 is connected to a first direct current power supply, the emitter of the phototriode of the optocoupler B1 is connected to the second end of the IFD module, the collector of the phototriode of the optocoupler B1 is sequentially connected to the first end of the fifth resistor R5 and the second end of the main control unit 101, and the second end of the second resistor R5 is connected to the first direct current power supply.
Specifically, through setting up opto-coupler B1, keep apart the control end and the power supply end of IFD module, reduce the EMI influence of IFD module to MCU, opto-coupler B1 can adopt LTV816S-TP-B, and MCU' S first IO port IO1 passes through NPN switch triode V1 drive opto-coupler B1, and first DC power supply can be +5V power, and second DC power supply can be +12V power.
In order to control harmonics of the main control unit, in the preferred embodiment of the present application, as shown in fig. 3, the main control unit 101 further comprises a first capacitor C1 and a second capacitor C2, wherein,
the common connection point of the first end of the first capacitor C1 and the second end of the fifth resistor R5 is connected to the second dc power supply, the first end of the second capacitor C2 is connected to the collector of the phototriode of the optocoupler B1, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are grounded.
For more reliable monitoring and control of the short-circuit current, in the preferred embodiment of the present application, as shown in fig. 3, the over-current protection unit 102 further includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first comparator LM1 and a third capacitor C3, wherein,
the first end of the sixth resistor R6 is the first end of the over-current protection unit 102, the second end of the sixth resistor R6 is connected to the positive input end of the first comparator LM1, the first end of the seventh resistor R7 is connected to the second dc power supply, the second end of the seventh resistor R7 and the first end of the eighth resistor R8 are commonly connected to the negative input end of the first comparator LM1, the common connection point of the positive input end of the first comparator LM1 and the first end of the third capacitor C3 is connected to the first dc power supply, the common connection point of the output end of the first comparator LM1 and the first end of the ninth resistor R9 is connected to the second end of the over-current protection unit 102, the second end of the ninth resistor R9 is connected to the first dc power supply, and the second end of the eighth resistor R8, the negative input end of the first comparator LM1 and the second end of the third capacitor C3 are all grounded.
R5 can be used as a sampling resistor, R5 can be 2Ω, and according to the parameters of the IFD module, under normal state, the power of the IFD module can be 3W, and the voltage is 12V, namely the current is 250mA, so the voltage drop of the sampling resistor R5 is 0.5V. A first preset threshold value of the current can be set to be 1A, namely when the voltage drop of the sampling resistor R5 is greater than 2V, the short circuit is determined, the first comparator LM1 outputs a first low level signal, and the first low level signal is sent to the MCU through the second IO port IO2, so that the MCU cuts off the power supply of the IFD module, specifically cuts off the second dc power supply of +12v; otherwise, the first comparator LM1 outputs a high level signal, R9 is a pull-up resistor.
In order to find the disconnection of the IFD module in time, in a preferred embodiment of the present application, as shown in fig. 3, the disconnection warning unit 103 further includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a second comparator LM2, and a fourth capacitor C4, wherein,
the first end of the tenth resistor R10 is the first end of the open circuit alarm unit 103, the second end of the tenth resistor R10 is connected to the negative input end of the second comparator LM2, the first end of the eleventh resistor R11 is connected to the second dc power supply, the second end of the eleventh resistor R11 and the first end of the twelfth resistor R12 are commonly connected to the positive input end of the second comparator LM2, the common point of the negative input end of the second comparator LM2 and the first end of the fourth capacitor C4 is connected to the first dc power supply, the common point of the output end of the second comparator LM2 and the first end of the thirteenth resistor R13 is connected to the second end of the open circuit alarm unit 103, the second end of the thirteenth resistor R13 is connected to the first dc power supply, and the second end of the twelfth resistor R12, the positive input end of the second comparator LM2 and the second end of the fourth capacitor C4 are all grounded.
According to the parameters of the IFD module, a second preset threshold of the current may be set to 83mA, when the voltage drop of the sampling resistor R5 is less than 0.16V, it is determined that the IFD module is turned off, and the second comparator LM2 outputs a second low level signal and sends the second low level signal to the MCU through the third IO port IO3, so that the MCU sends an open circuit alarm signal; otherwise, the second comparator LM2 outputs a high level signal, R13 is a pull-up resistor.
In order to control harmonics in the main control unit, in a preferred embodiment of the present application, as shown in fig. 3, the main control unit 101 further comprises a fifth capacitor C5 and a sixth capacitor C6, wherein,
the first end of the fifth capacitor C5 is connected to the second dc power supply, the first end of the sixth capacitor C6 is connected to the first dc power supply, and the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are grounded.
In order to improve the reliability of controlling the negative ion module, in the preferred embodiment of the present application, as shown in fig. 2 and 4, the negative ion control unit 200 further includes a first relay 201 and a second relay 202, wherein,
the first input end of the first relay 201 is the input end of the negative ion control unit 200, the first input end of the first relay 201 is connected with the fourth IO port IO4 of the MCU300, the first output end of the first relay 201 is connected with the first end of the coil of the second relay 202, the second end of the coil of the second relay 202 is grounded, the first end of the switch of the second relay 202 is connected with the phase line L, the second end of the switch of the second relay 202 is connected with the first end of the negative ion module, and the second end of the negative ion module is connected with the zero line N.
In a specific application scenario of the present application, the first relay 201 may be a ULN2003A driving relay, and an isolation mode is used to drive the negative ion module.
In order to control the harmonics of the first relay, in a preferred embodiment of the present application, as shown in fig. 4, the first relay 201 further comprises a seventh capacitor C7 and an eighth capacitor C8, wherein,
a first end of the seventh capacitor C7 is connected to the first input end of the first relay 201, a second end of the seventh capacitor C7 is grounded, a second output end of the first relay 201 and a second end of the eighth capacitor C8 are commonly connected to the second dc power supply, and a common contact point between the second input end of the first relay 201 and the first end of the eighth capacitor C8 is grounded.
Through the application of the technical scheme, the air conditioner purifying control circuit comprises a micro control unit MCU, a strong field dielectric IFD control unit and a negative ion control unit, wherein the IFD control unit further comprises: the device comprises a main control unit, an overcurrent protection unit and a circuit breaking alarm unit, wherein the first end of the main control unit is connected with a first IO port of an MCU, the second end of the main control unit is respectively connected with the first end of the overcurrent protection unit and the first end of the circuit breaking alarm unit, the second end of the overcurrent protection unit is connected with a second IO port of the MCU, the second end of the circuit breaking alarm unit is connected with a third IO port of the MCU, an optocoupler is arranged in the main control unit, a control end and a power supply end of an IFD module are isolated, a first relay is arranged in an anion control unit, an anion module is driven in an isolated mode, the influence of the IFD module and the anion module on the MCU is reduced, and the IFD module can be subjected to short-circuit protection and circuit breaking monitoring through the arrangement of a current sampling resistor and the overcurrent protection unit, so that the reliability of the IFD module and the anion module is improved, and the purification and sterilization effects of an air conditioner are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, one of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. An air conditioner purifying control circuit, which is characterized by comprising a micro control unit MCU, a strong field dielectric IFD control unit and a negative ion control unit, wherein the IFD control unit further comprises: a main control unit, an overcurrent protection unit and a circuit breaking alarm unit, wherein,
the first end of the main control unit is connected with the first IO port of the MCU, the second end of the main control unit is respectively connected with the first end of the overcurrent protection unit and the first end of the open circuit alarm unit, the second end of the overcurrent protection unit is connected with the second IO port of the MCU, and the second end of the open circuit alarm unit is connected with the third IO port of the MCU;
the main control unit is used for receiving a control instruction of the MCU through the first IO port and controlling the IFD module according to the control instruction;
the overcurrent protection unit is used for monitoring the current of the IFD module and sending a first low-level signal to the MCU through the second IO port when the current exceeds a first preset threshold value so as to enable the MCU to cut off the power supply of the IFD module;
the circuit breaking alarm unit is used for monitoring the current and sending a second low-level signal to the MCU through the third IO port when the current is smaller than a second preset threshold value so that the MCU sends out a circuit breaking alarm signal;
the main control unit also comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, an optocoupler and a switching triode, wherein,
the first end of the first resistor is the first end of the main control unit, the second end of the first resistor and the first end of the second resistor are connected to the base electrode of the switch triode in a sharing mode, the common joint of the second end of the second resistor and the emitter electrode of the switch triode is grounded, the collector electrode of the switch triode and the first end of the fourth resistor are connected to the cathode of the light emitting diode of the optocoupler in a sharing mode, the second end of the fourth resistor and the first end of the third resistor are connected to the anode of the light emitting diode of the optocoupler in a sharing mode, the second end of the third resistor is connected with a first direct current power supply, the emitter electrode of the phototriode of the optocoupler is connected with the second end of the IFD module, the collector electrode of the phototriode of the optocoupler is sequentially connected with the first end of the fifth resistor and the second end of the main control unit, the first end of the fifth resistor is connected with a second direct current power supply, and the first end of the IFD module is grounded.
2. The circuit of claim 1, wherein the main control unit further comprises a first capacitor and a second capacitor, wherein,
the common connection point of the first end of the first capacitor and the second end of the fifth resistor is connected with the second direct current power supply, the first end of the second capacitor is connected with the collector electrode of the phototriode of the optocoupler, and the second end of the first capacitor and the second end of the second capacitor are grounded.
3. The circuit of claim 1, wherein the over-current protection unit further comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first comparator, and a third capacitor, wherein,
the first end of the sixth resistor is the first end of the overcurrent protection unit, the second end of the sixth resistor is connected with the positive input end of the first comparator, the first end of the seventh resistor is connected with the second direct current power supply, the second end of the seventh resistor and the first end of the eighth resistor are commonly connected with the negative input end of the first comparator, the common connection point of the positive input end of the first comparator and the first end of the third capacitor is connected with the first direct current power supply, the common connection point of the output end of the first comparator and the first end of the ninth resistor is connected with the second end of the overcurrent protection unit, the second end of the eighth resistor, the negative input end of the first comparator and the second end of the third capacitor are all grounded.
4. The circuit of claim 1, wherein the trip alarm unit further comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a second comparator, and a fourth capacitor, wherein,
the first end of the tenth resistor is the first end of the disconnection alarming unit, the second end of the tenth resistor is connected with the negative input end of the second comparator, the first end of the eleventh resistor is connected with the second direct current power supply, the second end of the eleventh resistor and the first end of the twelfth resistor are commonly connected with the positive input end of the second comparator, the common connection point of the negative input end of the second comparator and the first end of the fourth capacitor is connected with the first direct current power supply, the common connection point of the output end of the second comparator and the first end of the thirteenth resistor is connected with the second end of the disconnection alarming unit, the second end of the thirteenth resistor, the positive input end of the second comparator and the second end of the fourth capacitor are all grounded.
5. The circuit of claim 1, wherein the main control unit further comprises a fifth capacitor and a sixth capacitor, wherein,
the first end of the fifth capacitor is connected with the second direct current power supply, the first end of the sixth capacitor is connected with the first direct current power supply, and the second end of the fifth capacitor and the second end of the sixth capacitor are grounded.
6. The circuit of claim 1, wherein the negative ion control unit further comprises a first relay and a second relay, wherein,
the first input end of the first relay is connected with the fourth IO port of the MCU, the first output end of the first relay is connected with the first end of the coil of the second relay, the second end of the coil of the second relay is grounded, the first end of the switch of the second relay is connected with the phase line, the second end of the switch of the second relay is connected with the first end of the negative ion module, and the second end of the negative ion module is connected with the zero line.
7. The circuit of claim 6, wherein the first relay further comprises a seventh capacitor and an eighth capacitor, wherein,
the first end of the seventh capacitor is connected with the first input end of the first relay, the second end of the seventh capacitor is grounded, the second output end of the first relay and the second end of the eighth capacitor are commonly connected with the second direct current power supply, and the common contact point between the second input end of the first relay and the first end of the eighth capacitor is grounded.
8. An air conditioner comprising the air conditioner purifying control circuit according to any one of claims 1 to 7, further comprising:
a refrigerant circulation loop for circulating the refrigerant in a loop formed by the compressor, the condenser, the expansion valve, the evaporator, the four-way valve and the pressure reducer;
the compressor is used for compressing the low-temperature low-pressure refrigerant gas into high-temperature high-pressure refrigerant gas and discharging the high-temperature high-pressure refrigerant gas to the condenser;
an outdoor heat exchanger and an indoor heat exchanger, wherein one of the two heat exchangers works as a condenser and the other works as an evaporator;
the four-way valve is used for controlling the flow direction of the refrigerant in the refrigerant circulation loop so as to switch the outdoor heat exchanger and the indoor heat exchanger between a condenser and an evaporator;
an indoor environment temperature sensor for detecting an indoor environment temperature;
and the indoor coil temperature sensor is used for detecting the indoor coil temperature.
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