Air conditioner

Abstract

The air conditioner comprises the steps that the environment temperature of an electric heating device is detected, and the resistance R1 of the electric heating device is obtained through calculation; the first switch is controlled to be switched on, the electric heating device works, the voltage detection circuit collects power grid voltage data, and the collected voltage data is processed in a first processing mode to obtain first power grid voltage V1; the first switch is controlled to be switched off, the electric heating device stops working, the voltage detection circuit collects power grid voltage data, and the collected voltage data is processed in a first processing mode to obtain second power grid voltage V2; the second power grid voltage V2, the first power grid voltage V1 and the electric heating device resistor R1 are subjected to first logical operation to obtain a power grid line resistor R2; when the power grid line resistance R2 is larger than the resistance threshold RY, power grid line fault early warning is triggered; whether the power grid where the air conditioner is located has abnormal conditions such as poor wiring or line aging loss increase can be judged through the power grid line resistance, and fault early warning is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner. Background Art

[0002] The air conditioner includes an indoor unit and an outdoor unit. An electric heating device can be set in the indoor unit for auxiliary heating.

[0003] Air conditioners are large-load household devices, and their operating current can range from several amperes to tens of amperes. When the grid line resistance is abnormal or does not match the air conditioner current, the grid line loss may increase, which may seriously cause safety hazards such as fire.

[0004] However, currently few air conditioners can determine whether the power grid line in which they are located has abnormal conditions such as poor wiring or increased line loss due to aging. Therefore, the present application proposes an air conditioner. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, according to an embodiment of the present disclosure, an air conditioner is proposed, comprising:

[0007] Air conditioner indoor unit;

[0008] An air-conditioning outdoor unit, communicatively connected to the air-conditioning indoor unit;

[0009] an electric heating device for heating the air in the indoor unit or the outdoor unit of the air conditioner;

[0010] A temperature collecting device, used to detect the ambient temperature of the electric heating device;

[0011] The two ends of the electric heating device are respectively connected to the live wire and the neutral wire of the AC power supply;

[0012] a first switch connected between the electric heating device and the live wire or the neutral wire;

[0013] A voltage detection circuit is used to detect voltage, wherein the voltage detection circuit includes two input terminals, and the two input terminals are respectively connected to the live wire and the neutral wire of the AC power supply;

[0014] The controller is configured as:

[0015] Detecting the ambient temperature of the electric heating device, wherein the ambient temperature is calculated by logically calculating the relationship between the resistance of the electric heating device and the ambient temperature to obtain the resistance R1 of the electric heating device;

[0016] Controlling the first switch to be closed, the electric heating device to work, the voltage detection circuit to collect grid voltage data, and using the first processing method to process the collected voltage data to obtain a first grid voltage V1;

[0017] Controlling the first switch to be disconnected, the electric heating device stops working, the voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2;

[0018] The second grid voltage V2, the first grid voltage V1 and the electric heating device resistance R1 are used to obtain the grid line resistance R2 through a first logical operation;

[0019] When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered.

[0020] The resistance of the electric heating device can be obtained by detecting the ambient temperature. By setting up a voltage detection circuit, the first grid voltage and the second grid voltage can be obtained, and the grid line resistance can be further obtained. The grid line resistance can be used to determine whether the grid where the air conditioner is located has poor wiring or increased line aging loss and other abnormalities, thereby achieving fault warning and ensuring the safety of the circuit where the air conditioner is located. This solution does not require additional detection equipment.

[0021] According to an embodiment of the present disclosure, the controller includes:

[0022] An indoor controller is connected to the first switch to control the opening and closing of the first switch.

[0023] According to an embodiment of the present disclosure, the controller includes:

[0024] The outdoor controller is connected to the output end of the voltage detection circuit.

[0025] According to an embodiment of the present disclosure, the voltage detection circuit includes:

[0026] Integrated operational amplifier circuit, including:

[0027] An output end of the integrated operational amplifier circuit is connected to the outdoor controller;

[0028] The same-direction input terminal and the reverse input terminal are respectively connected to the neutral wire and the live wire of the AC power supply through resistors to achieve voltage detection.

[0029] According to an embodiment of the present disclosure, RY<first parameter value, the first parameter value is 11Ω or 10Ω or 9Ω, to avoid the first parameter value being too large so that an early warning cannot be issued when problems such as poor wiring or line aging occur in the power grid.

[0030] According to an embodiment of the present disclosure, the resistance threshold RY is obtained by performing a second logical operation on the grid length, the line load area of ​​the grid line, and the grid line resistivity, which can determine the resistance threshold more accurately.

[0031] According to an embodiment of the present disclosure, the indoor controller is connected to the temperature acquisition device to control the temperature acquisition device to acquire the ambient temperature.

[0032] According to an embodiment of the present disclosure, the first switch is a relay, which includes a switch part and a coil part. The switch part is connected between the electric heating device and the neutral wire or the live wire, and the coil part is connected to the indoor controller to facilitate the controller to control the on and off of the first switch.

[0033] According to an embodiment of the present disclosure, the first switch is a thyristor, which facilitates the controller to control the on and off of the first switch.

[0034] According to an embodiment of the present disclosure, an air conditioner is further provided, comprising:

[0035] A controller, comprising an indoor controller and an outdoor controller, wherein the outdoor controller is communicatively connected to the indoor controller;

[0036] An electric heating device for heating;

[0037] A temperature acquisition device, used to detect the ambient temperature of the electric heating device and connected to the indoor controller;

[0038] The two ends of the electric heating device are respectively connected to the live wire and the neutral wire of the AC power supply;

[0039] a first switch connected between the electric heating device and the live wire or the neutral wire;

[0040] A voltage detection circuit, used for detecting voltage and having an output end connected to the outdoor controller, wherein the voltage detection circuit includes two input ends, which are respectively connected to the live wire and the neutral wire of the AC power supply;

[0041] The controller is configured as:

[0042] Detecting the ambient temperature of the electric heating device, wherein the ambient temperature is calculated by logically calculating the relationship between the resistance of the electric heating device and the ambient temperature to obtain the resistance R1 of the electric heating device;

[0043] Controlling the first switch to be closed, the electric heating device to work, the voltage detection circuit to collect grid voltage data, and using the first processing method to process the collected voltage data to obtain a first grid voltage V1;

[0044] Controlling the first switch to be disconnected, the electric heating device stops working, the voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2;

[0045] The second grid voltage V2, the first grid voltage V1 and the electric heating device resistance R1 are used to obtain the grid line resistance R2 through a first logical operation;

[0046] When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 is a structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0049] Figure 2 is another structural schematic diagram of an air conditioner according to an embodiment of the present application;

[0050] Figure 3 is a flow chart of an air conditioner according to an embodiment of the present application;

[0051] Figure 4 is another flow chart of an air conditioner according to an embodiment of the present application;

[0052] Figure 5 is a partial structural diagram of an air conditioner according to an embodiment of the present application;

[0053] Figure 6 is a schematic diagram of another part of the structure of the air conditioner according to the embodiment of the present application;

[0054] Figure 7 is a schematic diagram of another part of the structure of the air conditioner according to the embodiment of the present application;

[0055] Figure 8 is a graph showing the relationship between the resistance of an electric heating device and the ambient temperature according to an embodiment of the present application;

[0056] Figure 9 2 is a schematic diagram of selecting an AC voltage peak value according to an embodiment of the present application;

[0057] Figure 10 This is a schematic diagram of selecting the average value of the positive cycle AC voltage according to an embodiment of the present application;

[0058] Figure 11 This is a schematic diagram of selecting the average value of the negative periodic AC voltage according to the implementation manner of the present application.

[0059] In the above figures:

[0060] Air conditioner indoor unit 1; indoor controller 11;

[0061] Air conditioner outdoor unit 2; outdoor controller 21;

[0062] Communication unit 31;

[0063] Voltage detection circuit 32; integrated operational amplifier circuit 321; non-inverting input terminal 322; reverse input terminal 323;

[0064] Electric heating device 33;

[0065] Temperature collecting device 34;

[0066] First switch 35 ; switch portion 351 ; coil portion 352 ; thyristor 353 . DETAILED DESCRIPTION

[0067] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0068] The present application proposes an air conditioner, which is described below with reference to the accompanying drawings.

[0069] In the present application, the air conditioner may include an air conditioner indoor unit 1 .

[0070] In this application, the air conditioner may include an air conditioner outdoor unit 2 .

[0071] The outdoor unit and indoor unit of the air conditioner can be connected. The indoor unit and outdoor unit of the air conditioner can be connected by communication.

[0072] In the present application, the air conditioner may include a communication unit 31. The communication unit may be connected between the air conditioner indoor unit and the air conditioner outdoor unit to enable the air conditioner indoor unit and the air conditioner outdoor unit to communicate.

[0073] In the present application, the air conditioner indoor unit may include an indoor casing.

[0074] An indoor air inlet may be formed on the indoor casing.

[0075] An indoor air outlet may be formed on the indoor casing.

[0076] An indoor air duct may be formed in the indoor casing.

[0077] The indoor air duct can be connected to the indoor air inlet. The indoor air duct can be connected to the indoor air outlet.

[0078] In the present application, the air conditioner indoor unit may include an indoor heat exchanger.

[0079] The indoor heat exchanger can be arranged in the indoor air duct and can be used to exchange heat with the air entering the indoor air duct from the indoor air inlet.

[0080] In the present application, the air conditioner indoor unit may include an indoor fan.

[0081] The indoor fan can be arranged in the indoor air duct and is used to provide power for the flow of air.

[0082] The indoor fan can be arranged on a side of the indoor heat exchanger away from the indoor air inlet.

[0083] The indoor fan drives the air from the indoor air inlet into the indoor air duct and flows to the indoor heat exchanger to exchange heat with the indoor heat exchanger. The air after heat exchange with the indoor heat exchanger can flow out of the indoor air duct through the indoor air outlet.

[0084] In the present application, the air conditioner outdoor unit may include an outdoor casing.

[0085] The outdoor housing may be formed with an outdoor air inlet and an outdoor air outlet.

[0086] An outdoor air duct may be formed in the outdoor casing.

[0087] The outdoor air duct can be connected to the outdoor air inlet. The outdoor air duct can be connected to the outdoor air outlet.

[0088] In the present application, the air conditioner outdoor unit may include an outdoor heat exchanger. The outdoor heat exchanger may be arranged in the outdoor air duct. The outdoor heat exchanger is used to exchange heat with the air entering the outdoor air duct through the outdoor air inlet.

[0089] In the present application, the air conditioner outdoor unit may include an outdoor fan.

[0090] The outdoor fan can be arranged in the outdoor air duct and is used to provide power for the flow of air.

[0091] The outdoor fan can be arranged on a side of the outdoor heat exchanger away from the outdoor air inlet.

[0092] The outdoor fan drives air from the outdoor air inlet into the outdoor air duct and flows to the outdoor heat exchanger to exchange heat with the outdoor heat exchanger. The air after heat exchange with the outdoor heat exchanger can flow out of the outdoor air duct through the outdoor air outlet.

[0093] In the present application, the air conditioner may include a compressor. The compressor may be arranged in an outdoor casing.

[0094] Of both the indoor heat exchanger and the outdoor heat exchanger, one is a condenser and the other is an evaporator.

[0095] The compressor can compress the refrigerant gas in a low-temperature and low-pressure state and discharge the refrigerant gas in a high-temperature and high-pressure state.

[0096] The exhausted refrigerant gas flows into the condenser.

[0097] The condenser condenses the compressed refrigerant into liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0098] The air conditioner may include an expansion valve. The expansion valve may be an electronic expansion valve. The expansion valve can expand the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant.

[0099] 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.

[0100] The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled.

[0101] The air conditioner may include a refrigerant circuit that sequentially connects a compressor, a condenser, an expansion valve, and an evaporator to circulate refrigerant.

[0102] The air conditioner may include a cooling mode. In the cooling mode, the indoor heat exchanger serves as an evaporator, the outdoor heat exchanger serves as a condenser, and the refrigerant circulates sequentially through the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger.

[0103] The air conditioner may include a heating mode. In the heating mode, the indoor heat exchanger functions as a condenser and the outdoor heat exchanger functions as an evaporator, and the refrigerant circulates sequentially through the compressor, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger.

[0104] In the present application, the air conditioner may include a four-way valve that can change the flow direction of the refrigerant to enable switching between a refrigeration cycle and a heating cycle.

[0105] Air conditioners are high-load household appliances, operating at currents ranging from several amperes to tens of amperes. When the grid line resistance is abnormal or mismatched with the air conditioner current, grid line losses may increase, potentially posing a serious safety hazard such as a fire. Currently, few air conditioners can determine whether their grid line is experiencing abnormalities such as poor wiring or increased line loss due to aging. Therefore, this application proposes an air conditioner capable of determining whether the grid line in which the air conditioner is located has abnormalities such as poor wiring or increased line loss due to aging.

[0106] In the present application, the air conditioner includes a voltage detection circuit 32. The voltage detection circuit is used to detect voltage.

[0107] In the present application, the air conditioner may include an electric heating device 33. The electric heating device is used to heat air.

[0108] In the present application, the electric heating device may be provided in the indoor unit of the air conditioner.

[0109] The electric heating device can be arranged in the indoor casing. The electric heating device is used to heat the air in the indoor unit of the air conditioner.

[0110] The electric heating device can be arranged on a side of the indoor heat exchanger close to the indoor air inlet.

[0111] The electric heating device can be arranged on a side of the indoor heat exchanger away from the indoor air inlet. The electric heating device is arranged between the indoor heat exchanger and the indoor fan.

[0112] The electric heating device can heat the air entering the indoor air duct from the indoor air inlet, so that the electric heating device can play a role of auxiliary heating.

[0113] In the present application, the electric heating device may be provided in the outdoor unit of the air conditioner.

[0114] The electric heating device is arranged in the outdoor unit housing and is used to heat the air in the outdoor unit of the air conditioner.

[0115] The electric heating device can be arranged on a side of the outdoor heat exchanger close to the outdoor air inlet.

[0116] The electric heating device can be arranged on a side of the outdoor heat exchanger away from the outdoor air inlet. The electric heating device is arranged between the outdoor heat exchanger and the outdoor fan.

[0117] The electric heating device can heat the air entering the outdoor air duct from the outdoor air inlet, so that the electric heating device can play a role of auxiliary heating.

[0118] In the present application, the air conditioner may include a temperature collecting device 34. The temperature collecting device may be used to detect the ambient temperature T at the electric heating device.

[0119] In the present application, the temperature acquisition device can be provided on the electric heating device.

[0120] In this application, the temperature collection device can be arranged on the indoor casing.

[0121] In this application, the temperature collection device can be arranged on the outdoor casing.

[0122] In the present application, the temperature acquisition device may be a temperature sensor.

[0123] In the present application, both ends of the electric heating device may be connected to the live wire and the neutral wire of the AC power supply, respectively.

[0124] In the present application, the air conditioner may include a first switch 35 .

[0125] The first switch may be connected between the electric heating device and the live wire.

[0126] The first switch may be connected between the electric heating device and the neutral line.

[0127] In the present application, when the electric heating device is disposed in the indoor casing, the first switch may be disposed in the indoor casing.

[0128] In the present application, when the electric heating device is disposed in an outdoor casing, the first switch may be in the outdoor casing.

[0129] In the present application, the voltage detection circuit may include an input terminal and two output terminals. The two input terminals may be connected to the live wire and the neutral wire of the AC power supply, respectively.

[0130] In the present application, the air conditioner may include a controller.

[0131] The controller is configured as:

[0132] Detecting the ambient temperature at the electric heating device, the ambient temperature is calculated by the relationship between the resistance of the electric heating device and the ambient temperature to obtain the resistance R1 of the electric heating device;

[0133] Controlling the first switch to close, the electric heating device to work, the voltage detection circuit to collect grid voltage data, and using the first processing method to process the collected voltage data to obtain a first grid voltage V1;

[0134] Controlling the first switch to be disconnected, the electric heating device stops working, the voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2;

[0135] The second grid voltage V2, the first grid voltage V1 and the resistance R1 of the electric heating device are used to obtain the grid line resistance R2 through a first logical operation;

[0136] When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered.

[0137] The resistance of the electric heating device can be obtained by detecting the ambient temperature. By setting up a voltage detection circuit, the first grid voltage and the second grid voltage can be obtained, and the grid line resistance can be further obtained. The grid line resistance can be used to determine whether the grid where the air conditioner is located has poor wiring or increased line aging loss and other abnormalities, thereby achieving fault warning and ensuring the safety of the circuit where the air conditioner is located. This solution does not require additional detection equipment.

[0138] In this application, the controller can be connected to the temperature acquisition device.

[0139] In the present application, the controller may include an indoor controller 11. A temperature acquisition device may be connected to the indoor controller. The indoor controller controls the temperature acquisition device to acquire the ambient temperature.

[0140] When the temperature collecting device is connected to the indoor controller, the temperature collecting device can be arranged in the indoor casing.

[0141] When the temperature collecting device is connected to the indoor controller, the electric heating device can be arranged in the indoor casing.

[0142] When the temperature collecting device is connected to the indoor controller, the first switch can be arranged in the indoor casing.

[0143] In the present application, the controller may include an outdoor controller 21. The temperature collection device may be connected to the outdoor controller. The outdoor controller controls the temperature collection device to collect the ambient temperature.

[0144] When the temperature collecting device is connected to the outdoor controller, the temperature collecting device can be arranged in the outdoor casing.

[0145] When the temperature collecting device is connected to the outdoor controller, the electric heating device can be arranged in the outdoor casing.

[0146] When the temperature collecting device is connected to the outdoor controller, the first switch can be arranged in the outdoor casing.

[0147] In the present application, the first switch is connected to the indoor controller, and the indoor controller controls the opening and closing of the first switch.

[0148] In the present application, the first switch may be a relay.

[0149] The relay may include a switch portion 351. The switch portion is connected between the electric heating device and the neutral line or the switch portion is connected between the electric heating device and the live line.

[0150] The relay may include a coil portion 352. The coil portion may be connected to the indoor controller.

[0151] The indoor controller controls the powering on and off of the coil unit. This powering on and off of the coil unit closes and opens the switch unit. The closing and opening of the switch unit corresponds to the closing and opening of the first switch, making it easier for the controller to control the opening and closing of the first switch.

[0152] In the present application, the outdoor controller may be connected to the output end of the voltage detection circuit.

[0153] In the present application, the voltage detection circuit may include an integrated operational amplifier circuit 321 .

[0154] The integrated operational amplifier circuit may include an integrated operational amplifier circuit output terminal, which may be connected to the outdoor controller.

[0155] The integrated operational amplifier circuit may include a non-inverting input terminal 322. The integrated operational amplifier circuit may include an inverting input terminal 323.

[0156] The same-direction input terminal and the reverse input terminal are respectively connected to the neutral line and the live line of the power grid through resistors to realize voltage detection.

[0157] In this application, the same-direction input terminal is connected to the neutral line of the power grid, and the reverse-direction input terminal is connected to the live line of the power grid.

[0158] In this application, the same-direction input terminal is connected to the live wire of the power grid, and the reverse input terminal is connected to the neutral wire of the power grid.

[0159] In this application, the first logic may be:

[0160] R2=R1*(V2-V1) / V1;

[0161] R1 is the resistance of the electric heating device when the ambient temperature is T; V2 is the second grid voltage; V1 is the first grid voltage; R2 is the grid line resistance.

[0162] In the present application, when the first switch is closed, the electric heating device and the grid line resistor are connected in series. The voltage detection circuit may detect the voltage across the electric heating device.

[0163] In the present application, when the first switch is disconnected, the voltage detection circuit may detect the power supply voltage.

[0164] (V2-V1) / R2=V1 / R1.

[0165] In this application, RY < the first parameter value. The first parameter value can be 11Ω, 10Ω, or 9Ω, to avoid the first parameter value being too large so that an early warning cannot be issued when the grid has problems such as poor wiring or line aging.

[0166] In the present application, the resistance threshold RY is obtained by performing a second logical operation on the grid length, the line load area of ​​the grid line, and the grid line resistivity, which can determine the resistance threshold more accurately.

[0167] In this application, the second logic may be:

[0168] RY = ρ * L / S; ρ is the resistivity of the power line; L is the length of the power line, the unit of L is m; S is the line load area of ​​the power line, the unit of S is mm 2 .

[0169] The resistivity of copper wire is 0.0172, and the resistivity of aluminum wire is 0.0283.

[0170] In the present application, the ambient temperature T may be an absolute temperature, and the unit of T is K.

[0171] In this application, the relationship between the resistance of the electric heating device and the ambient temperature is logically as follows:

[0172] R1=R 25 *exp[B*(1 / T-1 / T 25 )];

[0173] R1 can be the resistance at absolute temperature T. The unit of R1 is Ω.

[0174] T 25 is the absolute temperature when the relative humidity is 25, T 25 The unit is K. R 25 The absolute temperature is T 25 The resistance, R 25 The unit is Ω.

[0175] B coefficient, the unit of B is K.

[0176] In the present application, the relationship between the resistance of the electric heating device and the ambient temperature may be an exponential function. The relationship between the resistance of the electric heating device and the ambient temperature may be a decreasing exponential function.

[0177] As the ambient temperature increases, the resistance of the electric heating device gradually decreases and tends to a fixed value.

[0178] In this application, the controller runs the following steps:

[0179] S1: Detect the ambient temperature of the electric heating device;

[0180] S2: The resistance R1 of the electric heating device is obtained by logically calculating the relationship between the resistance of the electric heating device and the ambient temperature;

[0181] In this application, the controller runs the following steps:

[0182] S3: Control the first switch to close and the electric heating device to start working;

[0183] S4: The voltage detection circuit collects grid voltage data, and processes the collected voltage data using a first processing method to obtain a first grid voltage V1.

[0184] In this application, the controller runs the following steps:

[0185] S5: Control the first switch to be turned off, and the electric heating device stops working;

[0186] S6: The voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2.

[0187] In this application, the controller runs the following steps:

[0188] S7: The second grid voltage V2, the first grid voltage V1 and the resistance R1 of the electric heating device are used to obtain the grid line resistance R2 through a first logical operation;

[0189] S8: Determine whether the grid line resistance R2 is greater than the resistance threshold RY;

[0190] S9: When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered and the process ends.

[0191] S10: When the grid line resistance R2 is not greater than the resistance threshold RY, the grid line fault warning is not triggered.

[0192] In the present application, the controller sequentially runs S3 and S4 after running S2; the controller sequentially runs S5 and S6 after running S4; and the controller sequentially runs S7 after running S6.

[0193] In the present application, the controller sequentially runs S5 and S6 after running S2; the controller sequentially runs S3 and S4 after running S6; and the controller sequentially runs S7 after running S4.

[0194] In this application, the controller ends after executing S10.

[0195] In this application, the controller re-runs S1 after completing S10 .

[0196] In this application, the controller runs S1 at timed intervals.

[0197] In this application, the communication unit connects the indoor controller and the outdoor controller.

[0198] The indoor controller can transmit information to the outdoor controller, and the outdoor controller controls the grid voltage data collected by the voltage detection circuit.

[0199] The outdoor controller transmits the collected grid voltage data to the indoor controller.

[0200] The indoor controller controls the temperature acquisition device to detect the ambient temperature at the electric heating device, and the indoor controller calculates the resistance R1 of the electric heating device according to the ambient temperature and the relationship between the resistance of the electric heating device and the ambient temperature.

[0201] The indoor controller controls the first switch to close and the electric heating device to work. The outdoor controller controls the voltage detection circuit to collect grid voltage data. The indoor controller uses the first processing method to process the collected voltage data to obtain the first grid voltage V1.

[0202] The indoor controller controls the first switch to be turned off, the electric heating device stops working, the outdoor controller controls the voltage detection circuit to collect grid voltage data, and the indoor controller uses the first processing method to process the collected voltage data to obtain the second grid voltage V2;

[0203] The indoor controller obtains the grid line resistance R2 through a first logical operation according to the second grid voltage V2, the first grid voltage V1 and the resistance R1 of the electric heating device.

[0204] In the present application, the first processing method is used to process the collected voltage data to obtain the AC voltage peak value.

[0205] The first grid voltage may be an AC voltage peak value, and the second grid voltage may be an AC voltage peak value.

[0206] The grid voltage data collected by the voltage detection circuit may be AC ​​voltage data for at least half a cycle. The AC voltage peak value is obtained based on the AC voltage data for half a cycle. The AC voltage peak value is the maximum value of the AC voltage.

[0207] In the present application, the first processing method is used to process the collected voltage data to obtain the effective value of the AC voltage.

[0208] The first grid voltage may be an effective value of an alternating current voltage. The second grid voltage may be an effective value of an alternating current voltage.

[0209] The grid voltage data collected by the voltage detection circuit may be AC ​​voltage data for at least half a cycle. The AC voltage peak value is obtained based on the AC voltage data for half a cycle. The AC voltage peak value is the maximum value of the AC voltage.

[0210] Calculate the AC voltage RMS value based on the AC voltage peak value. √2*AC voltage RMS value = AC voltage peak value.

[0211] In the present application, the collected voltage data is processed using the first processing method to obtain an average value of two fixed moments in the positive cycle of the AC voltage. The average value is not zero.

[0212] The two moments corresponding to the first grid voltage are the same as the two moments corresponding to the second grid voltage.

[0213] In this application, the collected voltage data is processed using the first processing method to obtain the absolute value of the average value of two fixed moments within a half cycle of the AC voltage. The average value is not zero.

[0214] The two moments corresponding to the first grid voltage are the same as the two moments corresponding to the second grid voltage.

[0215] In the present application, the electric heating device may be a PTC electric heating device.

[0216] In the present application, the electric heating device may be a metal electric heater.

[0217] In the present application, the first switch may be a thyristor 353 , which facilitates the controller to control the on and off of the first switch.

[0218] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0219] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0220] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0221] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner, characterized in that: include: Air conditioner indoor unit; An air-conditioning outdoor unit, communicatively connected to the air-conditioning indoor unit; an electric heating device for heating the air in the indoor unit or the outdoor unit of the air conditioner; A temperature collecting device, used to detect the ambient temperature of the electric heating device; The two ends of the electric heating device are respectively connected to the live wire and the neutral wire of the AC power supply; a first switch connected between the electric heating device and the live wire or the neutral wire; A voltage detection circuit is used to detect voltage, wherein the voltage detection circuit includes two input terminals, and the two input terminals are respectively connected to the live wire and the neutral wire of the AC power supply; The controller is configured as: Detecting the ambient temperature of the electric heating device, wherein the ambient temperature is calculated by logically calculating the relationship between the resistance of the electric heating device and the ambient temperature to obtain the resistance R1 of the electric heating device; Controlling the first switch to be closed, the electric heating device to work, the voltage detection circuit to collect grid voltage data, and using the first processing method to process the collected voltage data to obtain a first grid voltage V1; Controlling the first switch to be disconnected, the electric heating device stops working, the voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2; The second grid voltage V2, the first grid voltage V1 and the electric heating device resistance R1 are used to obtain the grid line resistance R2 through a first logical operation; When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered.

2. The air conditioner according to claim 1, characterized in that The controller includes: An indoor controller is connected to the first switch to control the opening and closing of the first switch.

3. The air conditioner according to claim 2, characterized in that The controller includes: The outdoor controller is connected to the output end of the voltage detection circuit.

4. The air conditioner according to claim 3, characterized in that The voltage detection circuit comprises: Integrated operational amplifier circuit, including: An output end of the integrated operational amplifier circuit is connected to the outdoor controller; The same direction input terminal and the reverse input terminal are respectively connected to the neutral wire and the live wire of the AC power supply through resistors.

5. The air conditioner according to claim 1, characterized in that RY<first parameter value, where the first parameter value is 11Ω, 10Ω, or 9Ω.

6. The air conditioner according to claim 1 or 5, characterized in that: The resistance threshold RY is obtained by performing a second logic operation on the length of the power grid, the line load area of ​​the power grid line, and the resistivity of the power grid line.

7. The air conditioner according to claim 2, characterized in that The indoor controller is connected to the temperature collecting device to control the temperature collecting device to collect the ambient temperature.

8. The air conditioner according to claim 2, characterized in that The first switch is a relay, which includes a switch portion and a coil portion. The switch portion is connected between the electric heating device and the neutral line or the live line, and the coil portion is connected to the indoor controller.

9. The air conditioner according to claim 2, characterized in that The first switch is a thyristor.

10. An air conditioner, characterized in that: include: A controller, comprising an indoor controller and an outdoor controller, wherein the outdoor controller is communicatively connected to the indoor controller; An electric heating device for heating; A temperature acquisition device, used to detect the ambient temperature of the electric heating device and connected to the indoor controller; The two ends of the electric heating device are respectively connected to the live wire and the neutral wire of the AC power supply; a first switch connected between the electric heating device and the live wire or the neutral wire; A voltage detection circuit, used for detecting voltage and having an output end connected to the outdoor controller, wherein the voltage detection circuit includes two input ends, which are respectively connected to the live wire and the neutral wire of the AC power supply; The controller is configured as: Detecting the ambient temperature of the electric heating device, wherein the ambient temperature is calculated by logically calculating the relationship between the resistance of the electric heating device and the ambient temperature to obtain the resistance R1 of the electric heating device; Controlling the first switch to be closed, the electric heating device to work, the voltage detection circuit to collect grid voltage data, and using the first processing method to process the collected voltage data to obtain a first grid voltage V1; Controlling the first switch to be disconnected, the electric heating device stops working, the voltage detection circuit collects grid voltage data, and processes the collected voltage data using the first processing method to obtain a second grid voltage V2; The second grid voltage V2, the first grid voltage V1 and the electric heating device resistance R1 are used to obtain the grid line resistance R2 through a first logical operation; When the grid line resistance R2 is greater than the resistance threshold RY, a grid line fault warning is triggered.

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