Compressor abnormality detection and protection method, device and air conditioner

Abstract

The present invention discloses a compressor abnormality detection protection method, device and air conditioner, wherein the method comprises: obtaining the air conditioner outdoor pipe temperature T 外‑管温 、Indoor ambient temperature T 内‑环温 and indoor pipe temperature T 内‑管温 ; According to the indoor ambient temperature T 内‑环温 The difference between the indoor pipe temperature and the 内‑管温 , outdoor pipe temperature T 外‑管温 The system compares the current compressor overload status with a first preset temperature value; obtains the high-frequency component of the voltage on the compressor branch line and determines the number of arcing events in the compressor motor winding based on the high-frequency component; compares the number of motor winding arcing events within a set time with the first preset value to determine whether the compressor is currently in a wear or damage period; and determines the corresponding protection mode based on the current compressor overload status, wear or damage period. The present invention can reduce overload conditions and proactively identify abnormal conditions in the air conditioner compressor motor winding, providing proactive protection if the winding is worn or arcing.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a compressor abnormality detection and protection method, device and air conditioner. Background Art

[0002] The compressor of a fixed-frequency split air conditioner only has one hardware protection, an overload protector, and lacks comprehensive protection such as variable-frequency exhaust, overcurrent, and high-voltage switches. If a fixed-frequency split air conditioner is overloaded for a long time (insufficient refrigerant, false refrigerant, dirty and blocked heat exchanger, etc.), it is very easy to cause carbonization of the refrigeration oil. After carbonization, the main and secondary phase lines of the motor winding may wear, bubble, and arc. Long-term arcing may seriously damage the insulation of the motor winding. Insulation failure will cause more severe continuous arcing, ignition, or short circuit. Such situations are more likely to cause high temperature and excessive internal pressure inside the cylinder. High temperature and high pressure can easily cause the compressor cylinder to explode or the terminal to burst out. The rolling or terminal bursting process will always release high-temperature gas and spark residue, which may ignite surrounding fan blades, grilles and other injection molded parts.

[0003] Compressor cylinder explosions and terminal breakouts can easily cause serious electrical safety incidents and should be avoided as much as possible. Currently, conventional technology involves adding an exhaust temperature sensor to the outdoor unit for detection. However, this approach is costly, primarily because fixed-frequency split units lack a control panel on the outdoor side, requiring the temperature sensor to extend a very long cable to the indoor unit's control panel. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a compressor abnormality detection and protection method, device and air conditioner to solve the problem of electrical safety accidents caused by long-term overload operation of fixed-frequency compressors, wear and arcing of internal motor windings.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a compressor abnormality detection and protection method, comprising:

[0006] Get the outdoor heat exchanger tube temperature T of the air conditioner 外-管温 , Indoor ambient temperature T 内-环温 and the indoor heat exchanger tube temperature T 内-管温 ;

[0007] According to the indoor ambient temperature T 内-环温 The difference between the indoor heat exchanger tube temperature and the indoor heat exchanger tube temperature T 内-管温 , outdoor heat exchanger tube temperature T 外-管温 Compare the values ​​with the first preset temperature value to determine the current overload state of the compressor;

[0008] Acquire a high-frequency component of the voltage on the compressor branch line, and determine the number of arc flashes of the motor winding of the compressor based on the high-frequency component of the voltage;

[0009] Determining whether the compressor is currently in a wear period or a damage period based on a comparison of the number of arc flashes of the motor winding within a set time with a first preset value;

[0010] Determine the corresponding protection method based on the current compressor overload status, wear period or damage period.

[0011] As a further improvement of the present invention: 内-环温 The difference between the indoor heat exchanger tube temperature and the indoor heat exchanger tube temperature T 内-管温 , outdoor heat exchanger tube temperature T 外-管温 , determining the overload status of the compressor specifically includes:

[0012] Judgment|T 内-环温 -T 内-管温 |> first preset temperature value, and T 外-管温 >Whether the logic of the first preset temperature value is true;

[0013] If both are yes, it is determined that the load state of the compressor is overloaded;

[0014] The first preset temperature range is 5°C to 10°C.

[0015] As a further improvement of the present invention, the step of determining that the current compressor is in a wear period or a damage period further includes:

[0016] If the current compressor is in an overload state and the cumulative number of times the compressor has experienced wear reaches K1 times, it is determined that the compressor is in a damage period;

[0017] Or if the cumulative number of times the compressor has been worn out reaches K2 times, it is determined that the compressor is in a damage period;

[0018] Among them, K2≥K1.

[0019] As a further improvement of the present invention, the step of obtaining the high-frequency component of the voltage on the compressor branch line and determining the number of arc flashes of the motor winding of the compressor according to the high-frequency component of the voltage specifically includes:

[0020] The voltage signal on the compressor branch line is collected N times in each power frequency cycle;

[0021] Calculating a high-frequency voltage component in a voltage signal on the Nth compressor branch line and calculating an accumulated value P;

[0022] determining whether the accumulated value P of the high-frequency component of the voltage is greater than a preset high-frequency value, and if so, recording the occurrence of arc flash in the motor winding of the compressor;

[0023] According to the number of arc flashes within the set time, it is determined whether the compressor is in the wear period or damage period;

[0024] The high-frequency voltage component is a voltage signal higher than a reference voltage signal, and the reference voltage signal is a high-frequency voltage component when the air conditioner operates normally in various working conditions.

[0025] As a further improvement of the present invention, the step of determining whether the compressor is in a wear period or a damage period according to the number of arc flashes within a set time specifically includes:

[0026] When the number of arc flashes is greater than 0 and lower than a first arc flash preset value, it is determined that the compressor is in a wear period;

[0027] When the number of arc flashes is higher than a first arc flash preset value, it is determined that the compressor is in a damage period.

[0028] As a further improvement of the present invention, the determining of the corresponding protection mode according to the current overload state, wear period or damage period of the compressor specifically includes:

[0029] As a further improvement of the present invention: if the current compressor is in the wear period, the internal fan is controlled to reduce the wind speed gear and re-determine whether the compressor is in the wear period;

[0030] If the compressor is out of the wear period after the internal fan speed gear is lowered, the air conditioner is controlled to operate at the gear with the lowered internal fan speed gear;

[0031] If the compressor is in the wear period after the internal fan speed is reduced, continue to reduce the internal fan speed until the internal fan is reduced to the lowest speed or the compressor is out of the wear period;

[0032] If the indoor fan is reduced to the lowest wind speed gear and the compressor is still in the wear period, the air conditioner is controlled to shut down and the fault code is displayed on the display screen of the indoor unit.

[0033] As a further improvement of the present invention, the determining of the corresponding protection mode according to the current overload state, wear period or damage period of the compressor further specifically includes:

[0034] If the compressor is currently in an overload state, the compressor and the external fan are controlled to be powered off until the overload condition is no longer met and lasts for more than a first preset time, and then the compressor and the external fan are controlled to operate again;

[0035] If the current compressor is in the damage period, the air conditioner indoor unit will be controlled to shut down, and the fault code will be displayed on the display screen of the air conditioner indoor unit, restricting the user from starting the air conditioner until the restriction is lifted after maintenance and unlocking.

[0036] The present invention also provides a compressor abnormality detection and protection device, which uses the above-mentioned compressor abnormality detection and protection method, including a voltage sampling circuit and a high-frequency counting unit;

[0037] The voltage sampling circuit is used to obtain the voltage signal on the compressor branch line;

[0038] The high-frequency counting unit includes a band-pass filter circuit, an operational amplifier circuit, a comparison circuit and an accumulator connected in sequence, and the band-pass filter circuit is connected to the signal output terminal of the voltage sampling circuit;

[0039] The bandpass filter circuit is used to obtain the high-frequency component of the voltage at a set frequency;

[0040] The comparison circuit is used to compare the high-frequency component of the voltage passing through the operational amplifier circuit with the reference voltage signal, and output a high level when the high-frequency component of the voltage is higher than the reference voltage signal;

[0041] The accumulator is used to obtain the accumulated value P of the high-frequency component of the voltage in each power frequency cycle.

[0042] Preferably, the voltage sampling circuit and the high-frequency counting unit are both arranged on the indoor side of the air-conditioning room, the signal input end of the voltage sampling circuit is arranged between the compressor drive circuit and the compressor, and the accumulator of the high-frequency counting unit is connected to the main control unit of the air-conditioning indoor unit mainboard.

[0043] The present invention also provides an air conditioner, comprising the above-mentioned compressor abnormality detection and protection method, or further comprising the above-mentioned compressor abnormality detection and protection device.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] This invention uses a high-frequency voltage signal sampling unit on the air conditioner's indoor unit mainboard to acquire the high-frequency voltage component of the compressor branch line. If the high-frequency count exceeds a preset value, it indicates a flashover arc within the air conditioner compressor winding. The indoor unit's main control unit determines whether the compressor winding is in a wear or damage state by counting the number of flashovers. It also determines whether the outdoor unit's compressor is operating in an overloaded state based on the outdoor pipe temperature, indoor environmental stability, and indoor pipe temperature. Different safety measures are implemented for each condition, ensuring that the air conditioner can continue to operate while ensuring the safety of the appliance as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is the compressor arc flash identification circuit diagram of the present invention.

[0047] Figure 2 Schematic diagram of the high-frequency counting unit of the present invention. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] In order to solve the technical problems in the prior art, the present invention is further described with reference to the accompanying drawings and embodiments:

[0050] like Figure 1-Figure 2 As shown, the present invention discloses a compressor abnormality detection and protection method, comprising:

[0051] S1: Get the outdoor heat exchanger pipe temperature T of the air conditioner 外-管温 , Indoor ambient temperature T 内-环温 and the indoor heat exchanger tube temperature T 内-管温 ;

[0052] The outdoor side of the conventional fixed frequency air conditioner has an outdoor heat exchanger pipe temperature sensor, the indoor unit has an ambient pipe temperature sensor and an indoor heat exchanger pipe temperature sensor, and the main control unit of the indoor unit obtains the outdoor heat exchanger pipe temperature T through the outdoor heat exchanger pipe temperature sensor. 外-管温 , obtain the indoor ambient temperature T through the ambient pipe temperature package 内-环温 And obtain the indoor heat exchanger tube temperature T through the indoor heat exchanger tube temperature sensor 内-管温 There is no need to add an exhaust temperature sensor on the outdoor unit side for detection, nor is there a need to install a control panel on the outdoor side. Control can be achieved directly using the main control unit of the air conditioner's indoor unit motherboard, which is low in cost.

[0053] S2: According to the indoor ambient temperature T 内-环温 The difference between the indoor heat exchanger tube temperature and the indoor heat exchanger tube temperature T 内-管温 , outdoor heat exchanger tube temperature T 外-管温 Compare the values ​​with the first preset temperature value to determine the current overload state of the compressor;

[0054] As a preferred embodiment of the present invention, step S2 specifically includes:

[0055] Judgment|T 内-环温 -T 内-管温 |> first preset temperature value, and T 外-管温 >Whether the logic of the first preset temperature value is true;

[0056] If both are yes, it is determined that the load state of the compressor is overloaded;

[0057] The first preset temperature range is 5°C to 10°C.

[0058] S3: Obtaining a high-frequency component of the voltage on the compressor branch line, and determining the number of arc flashes of the motor winding of the compressor according to the high-frequency component of the voltage;

[0059] As a preferred embodiment of the present invention, step S3 specifically includes:

[0060] The voltage signal on the compressor branch line is collected N times in each power frequency cycle. The power frequency cycle ranges from 15ms to 25ms, and the value range of N is preferably 1000 to 10000.

[0061] Calculate the high-frequency voltage component in the voltage signal on the N-th compressor branch line and calculate the accumulated value P, wherein the frequency range of the high-frequency voltage component is preferably 100K to 300KHZ;

[0062] determining whether the accumulated value P of the high-frequency component of the voltage is greater than a preset high-frequency value, and if so, recording the occurrence of arc flash in the motor winding of the compressor;

[0063] According to the number of arc flashes within the set time, it is determined whether the compressor is in the wear period or damage period;

[0064] The high-frequency voltage component is a voltage signal higher than a reference voltage signal, and the reference voltage signal is a high-frequency voltage component when the air conditioner operates normally in various working conditions.

[0065] Specifically, when there are discharge phenomena such as arc flash and arc pulling in the compressor motor winding circuit, the high-frequency component of the voltage signal in the compressor branch will increase significantly. The judgment of arc flash in the compressor motor winding is to use the strength and density of the high-frequency signal component.

[0066] A voltage sampling circuit is installed on the indoor side of the air conditioner to sample the main circuit voltage of the outdoor unit's compressor. This voltage sampling uses a resistor divider and then passes through a bandpass filter, which captures the high-frequency components of the voltage with a frequency of 100kHz to 300kHz. (If the compressor motor windings arc frequently or severely, the high-frequency components of the compressor branch voltage signal will have greater energy and density.) After passing through an op amp, this high-frequency voltage signal is compared with a reference voltage signal. The reference voltage is obtained by measuring the high-frequency component signal voltage under normal operating conditions of the air conditioner. This effectively filters out the high-frequency components of the air conditioner's normal operation and reduces the impact of background noise.

[0067] When there is a flashover arc, the high-frequency noise of the voltage signal will increase and be higher than the reference voltage, and a high level will be output. The accumulator is used to obtain the high-frequency accumulated value P of each power frequency cycle. Each power frequency cycle (20ms) collects N times and accumulates the number of high levels P. At the end of each power frequency cycle, the accumulation is cleared and recounted.

[0068] S4: Determining whether the compressor is currently in a wear period or a damage period based on the comparison of the number of arc flashes of the motor winding within a set time with a first preset value;

[0069] As a preferred embodiment of the present invention, step S4 specifically includes:

[0070] When the number of arc flashes is greater than 0 and lower than a first arc flash preset value, it is determined that the compressor is in a wear period;

[0071] When the number of arc flashes is higher than a first arc flash preset value, it is determined that the compressor is in a damage period.

[0072] Among them, the set time is preferably 10 minutes to 20 minutes, and the first arc flash preset value is preferably 50 to 200 times.

[0073] Specifically, the main control unit obtains the accumulated high-frequency counts for each power frequency cycle and determines whether the accumulated high-frequency counts for each cycle are greater than a first preset arc flash value. If the value is greater than the first preset arc flash value, it indicates a single arc flash. If the number of arc flashes within 10 minutes is greater than 0 and less than 100, it indicates the device is in the wear stage. If the number of arc flashes within 10 minutes is greater than 100, it indicates the device is in the damage stage.

[0074] As a more preferred embodiment of the present invention, determining in step S4 that the current compressor is in a wear period or a damage period further includes:

[0075] If the current compressor is in an overload state and the cumulative number of times the compressor has experienced wear reaches K1 times, it is determined that the compressor is in a damage period;

[0076] Or if the cumulative number of times the compressor has been worn out reaches K2 times, it is determined that the compressor is in a damage period;

[0077] Among them, K2≥K1.

[0078] Specifically, if the current overload state is reached and the number of wear periods reaches K1 times (a value of 3 to 6 times), it means that the current state is in the damage stage. Alternatively, if the cumulative number of wear periods reaches K2 times (a value of 5 to 20 times), it means that the current state is in the damage stage.

[0079] S5: Determine a corresponding protection method according to the current overload state, wear period or damage period of the compressor.

[0080] As a preferred embodiment of the present invention, step S5 specifically includes:

[0081] If the current compressor is in the wear period, control the internal fan to reduce the wind speed gear and re-judge whether the compressor is in the wear period;

[0082] If the compressor is out of the wear period after the internal fan speed gear is lowered, the air conditioner is controlled to operate at the gear with the lowered internal fan speed gear;

[0083] If the compressor is in the wear period after the internal fan speed is reduced, continue to reduce the internal fan speed until the internal fan is reduced to the lowest speed or the compressor is out of the wear period;

[0084] If the indoor fan is reduced to the lowest wind speed gear (usually the silent gear), the compressor is still in the wear period, the air conditioner is controlled to shut down, and the fault code is displayed on the display screen of the indoor unit.

[0085] Once it is determined to be in the damaged period, it cannot be returned to the wear period or normal working condition without repair.

[0086] As a preferred embodiment of the present invention, step S5 further specifically includes:

[0087] If the compressor is currently in an overload state, the compressor and the external fan are powered off, that is, the AC contactor is disconnected; until the overload condition is no longer met and the condition lasts for more than a first preset time, the compressor and the external fan are controlled to operate again, the first preset time being 3 minutes to 6 minutes, more preferably 3 minutes;

[0088] If the current compressor is in the damage period, the air conditioner indoor unit will be controlled to shut down, and the fault code will be displayed on the display screen of the air conditioner indoor unit, restricting the user from starting the air conditioner until the restriction is lifted after maintenance and unlocking.

[0089] Specifically, after professional maintenance personnel have completed the repair, they can unlock the restrictions and restore normal operation through specific operations, such as long pressing the air conditioner panel switch button.

[0090] Based on the same inventive concept, the present invention also discloses a compressor abnormality detection and protection device, which uses the above-mentioned compressor abnormality detection and protection method, including a voltage sampling circuit and a high-frequency counting unit;

[0091] The voltage sampling circuit is used to obtain the voltage signal on the compressor branch line;

[0092] The high-frequency counting unit includes a band-pass filter circuit, an operational amplifier circuit, a comparison circuit and an accumulator connected in sequence, and the band-pass filter circuit is connected to the signal output terminal of the voltage sampling circuit;

[0093] The bandpass filter circuit is used to obtain the high-frequency component of the voltage of the set frequency, and the set frequency is preferably 100K~300KHZ;

[0094] The comparison circuit is used to compare the high-frequency component of the voltage passing through the operational amplifier circuit with the reference voltage signal, and output a high level when the high-frequency component of the voltage is higher than the reference voltage signal;

[0095] The accumulator is used to obtain the accumulated value P of the high-frequency component of the voltage in each power frequency cycle.

[0096] The voltage sampling circuit and the high-frequency counting unit are both arranged inside the air-conditioning room. The signal input end of the voltage sampling circuit is arranged between the compressor drive circuit and the compressor. The accumulator of the high-frequency counting unit is connected to the main control unit of the air-conditioning indoor unit mainboard.

[0097] Based on the same inventive concept, the present invention also discloses an air conditioner, including the above-mentioned compressor abnormality detection and protection method, or including the above-mentioned compressor abnormality detection and protection device.

[0098] The foregoing description is intended only to provide specific embodiments of the present invention, intended to enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A compressor abnormality detection and protection method, characterized in that: include: Get the outdoor heat exchanger tube temperature T of the air conditioner 外-管温 , Indoor ambient temperature T 内-环温 and the indoor heat exchanger tube temperature T 内-管温 ; According to the indoor ambient temperature T 内-环温 The difference between the indoor heat exchanger tube temperature and the indoor heat exchanger tube temperature T 内-管温 , outdoor heat exchanger tube temperature T 外-管温 Compare the values ​​with the first preset temperature value to determine the current overload state of the compressor; Acquire a high-frequency component of the voltage on the compressor branch line, and determine the number of arc flashes of the motor winding of the compressor based on the high-frequency component of the voltage; Determining whether the compressor is currently in a wear period or a damage period based on a comparison of the number of arc flashes of the motor winding within a set time with a first preset value; Determine the corresponding protection method based on the current compressor overload status, wear period or damage period; The obtaining of the high-frequency component of the voltage on the compressor branch line and determining the number of arc flashes of the motor winding of the compressor according to the high-frequency component of the voltage specifically includes: The voltage signal on the compressor branch line is collected N times in each power frequency cycle; Calculating a high-frequency voltage component in a voltage signal on the Nth compressor branch line and calculating an accumulated value P; determining whether the accumulated value P of the high-frequency component of the voltage is greater than a preset high-frequency value, and if so, recording the occurrence of arc flash in the motor winding of the compressor; According to the number of arc flashes within the set time, it is determined whether the compressor is in the wear period or damage period; The high-frequency voltage component is a voltage signal higher than a reference voltage signal, and the reference voltage signal is a high-frequency voltage component when the air conditioner operates normally in various working conditions.

2. A compressor abnormality detection and protection method according to claim 1, characterized in that: According to the indoor ambient temperature T 内-环温 The difference between the indoor heat exchanger tube temperature and the indoor heat exchanger tube temperature T 内-管温 , outdoor heat exchanger tube temperature T 外-管温 , determining the overload status of the compressor specifically includes: Judgment|T 内-环温 -T 内-管温 |> first preset temperature value, and T 外-管温 >Whether the logic of the first preset temperature value is true; If both are yes, it is determined that the load state of the compressor is an overload state.

3. A compressor abnormality detection and protection method according to claim 1 or 2, characterized in that: Determining that the current compressor is in a wear period or a damage period further includes: If the current compressor is in an overload state and the cumulative number of times the compressor has experienced wear reaches K1 times, it is determined that the compressor is in a damage period; Or if the cumulative number of times the compressor has been worn out reaches K2 times, it is determined that the compressor is in a damage period; Among them, K2≥K1.

4. A compressor abnormality detection and protection method according to claim 1, characterized in that: Determining that the compressor is in a wear period or a damage period according to the number of arc flashes within a set time specifically includes: When the number of arc flashes is greater than 0 and lower than a first arc flash preset value, it is determined that the compressor is in a wear period; When the number of arc flashes is higher than a first arc flash preset value, it is determined that the compressor is in a damage period.

5. A compressor abnormality detection and protection method according to claim 1 or 4, characterized in that: Determining the corresponding protection method according to the current overload state, wear period or damage period of the compressor specifically includes: If the current compressor is in the wear period, control the internal fan to reduce the wind speed gear and re-judge whether the compressor is in the wear period; If the compressor is out of the wear period after the internal fan speed gear is lowered, the air conditioner is controlled to operate at the gear with the lowered internal fan speed gear; If the compressor is in the wear period after the internal fan speed is reduced, continue to reduce the internal fan speed until the internal fan is reduced to the lowest speed or the compressor is out of the wear period; If the indoor fan is reduced to the lowest wind speed gear and the compressor is still in the wear period, the air conditioner is controlled to shut down and the fault code is displayed on the display screen of the indoor unit.

6. A compressor abnormality detection and protection method according to claim 5, characterized in that: Determining the corresponding protection method according to the current overload state, wear period or damage period of the compressor further specifically includes: If the compressor is currently in an overload state, the compressor and the external fan are controlled to be powered off until the overload condition is no longer met and lasts for more than a first preset time, and then the compressor and the external fan are controlled to operate again; If the current compressor is in the damage period, the air conditioner indoor unit will be controlled to shut down, and the fault code will be displayed on the display screen of the air conditioner indoor unit, restricting the user from starting the air conditioner until the restriction is lifted after maintenance and unlocking.

7. A compressor abnormality detection and protection device, using the compressor abnormality detection and protection method according to claim 6, characterized in that: It includes a voltage sampling circuit and a high-frequency counting unit; The voltage sampling circuit is used to obtain the voltage signal on the compressor branch line; The high-frequency counting unit includes a band-pass filter circuit, an operational amplifier circuit, a comparison circuit and an accumulator connected in sequence, and the band-pass filter circuit is connected to the signal output terminal of the voltage sampling circuit; The bandpass filter circuit is used to obtain the high-frequency component of the voltage at a set frequency; The comparison circuit is used to compare the high-frequency component of the voltage passing through the operational amplifier circuit with the reference voltage signal, and output a high level when the high-frequency component of the voltage is higher than the reference voltage signal; The accumulator is used to obtain the accumulated value P of the high-frequency component of the voltage in each power frequency cycle.

8. The compressor abnormality detection and protection device according to claim 7, characterized in that: The voltage sampling circuit and the high-frequency counting unit are both arranged inside the air-conditioning room. The signal input end of the voltage sampling circuit is arranged between the compressor drive circuit and the compressor. The accumulator of the high-frequency counting unit is connected to the main control unit of the air-conditioning indoor unit mainboard.

9. An air conditioner, characterized in that: It includes a compressor abnormality detection and protection method as described in claim 6 above, or includes a compressor abnormality detection and protection device as described in claim 8 above.

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