Air conditioner and power estimation device, power estimation method and controller thereof

Abstract

The invention discloses an air conditioner and a power estimation device, a power estimation method and a controller thereof. The air conditioner comprises a compressor, a fan, a compressor IPM module used for driving the compressor, a fan IPM module used for driving the fan, a passive voltage doubling circuit used for providing direct current for the compressor IPM module and the fan IPM module, and a direct current bus capacitor used for smoothing the direct current. The detector is used for detecting DC bus voltage; the current detection circuit is used for detecting the average current of the compressor and the average current of the fan; and the controller is used for estimating the compressor power according to the direct-current bus voltage and the compressor average current, estimating the fan power according to the direct-current bus voltage and the fan average current, and summing the compressor power and the fan power to obtain the power of the air conditioner. The device can estimate the power of the air conditioner, does not need to detect the input current in real time, and is high in applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner, a power estimation device thereof, a power estimation method, and a controller. Background Art

[0002] In the air conditioner control solution, the calculation of the air conditioner power is a basic function. Currently, in the related art, software sampling is usually used to calculate the input AC voltage and AC current, and then the AC voltage and current are multiplied to obtain the power. However, the calculation scheme of the above related technology needs to measure the input AC voltage and AC current in real time, so there are many limitations in the application scenarios and the applicability is poor. For example, some air conditioners use a 115v passive voltage doubling scheme to supply power. In this passive voltage doubling scheme, theoretically only half of the AC current cycle can be collected, so the above calculation scheme cannot be used and thus the power calculation cannot be carried out. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, the first object of the present invention is to provide a power estimation device for an air conditioner. By arranging a voltage detection circuit, a current detection circuit and a controller in the device, where the voltage detection circuit is used to detect the DC bus voltage, and the current detection circuit is used to detect the average current of the compressor and the average current of the fan in the air conditioner. Subsequently, the controller estimates the compressor power according to the DC bus voltage and the average current of the compressor, estimates the fan power according to the DC bus voltage and the average current of the fan, and sums the compressor power and the fan power to obtain the power of the air conditioner, thereby realizing the power estimation of the air conditioner without the need to detect the input current in real time, and effectively improving the applicability of the device.

[0004] The second object of the present invention is to provide a power estimation method for an air conditioner.

[0005] The third object of the present invention is to provide a controller.

[0006] The fourth object of the present invention is to provide an air conditioner.

[0007] To achieve the above object, an embodiment of the first aspect of the present invention provides a power estimation device for an air conditioner. The air conditioner includes a compressor, a blower, a compressor IPM module for driving the compressor, a blower IPM module for driving the blower, a passive voltage multiplier circuit for supplying direct current to the compressor IPM module and the blower IPM module, and a DC bus capacitor for smoothing the direct current. The device includes: a voltage detection circuit for detecting the DC bus voltage; a current detection circuit for detecting the average current of the compressor and the average current of the blower; and a controller for estimating the compressor power based on the DC bus voltage and the average current of the compressor, estimating the blower power based on the DC bus voltage and the average current of the blower, and summing the compressor power and the blower power to obtain the power of the air conditioner.

[0008] According to the power estimation device for an air conditioner of the embodiment of the present invention, by providing a voltage detection circuit, a current detection circuit and a controller in the device, wherein the voltage detection circuit is used to detect the DC bus voltage, and the current detection circuit is used to detect the average current of the compressor and the average current of the blower in the air conditioner. Subsequently, the controller estimates the compressor power based on the DC bus voltage and the average current of the compressor, estimates the blower power based on the DC bus voltage and the average current of the blower, and sums the compressor power and the blower power to obtain the power of the air conditioner, thereby realizing the power estimation of the air conditioner without the need to detect the input current in real time, thus effectively improving the applicability of the device.

[0009] According to an embodiment of the present invention, the current detection circuit includes: a first single-resistor sampling circuit connected to the compressor IPM module for performing single-resistor sampling on the operating current of the compressor to obtain a first current sampling signal; and a first filtering circuit connected to the first single-resistor sampling circuit for filtering the first current sampling signal to obtain the average current of the compressor.

[0010] According to an embodiment of the present invention, the current detection circuit includes: a second single-resistor sampling circuit connected to the blower IPM module for performing single-resistor sampling on the operating current of the blower to obtain a second current sampling signal; and a second filtering circuit connected to the second single-resistor sampling circuit for filtering the second current sampling signal to obtain the average current of the blower.

[0011] According to an embodiment of the present invention, the controller is specifically configured to: obtain the product of the DC bus voltage and the average current of the compressor to obtain the initial compressor power; determine the compressor power range in which the initial compressor power is located; and correct the initial compressor power based on the correction factor corresponding to the compressor power range to obtain the compressor power, where different compressor power ranges correspond to different correction factors.

[0012] According to an embodiment of the present invention, the controller is specifically configured to: obtain the product of the DC bus voltage and the average current of the fan to obtain the initial power of the fan; determine the fan power range in which the initial power of the fan is located; and correct the initial power of the fan based on the correction factor corresponding to the fan power range to obtain the fan power, where different fan power ranges correspond to different correction factors.

[0013] According to an embodiment of the present invention, the controller is further configured to: calculate the power consumption of the air conditioner based on the power of the air conditioner; and / or calculate the power consumption of the compressor based on the compressor power; and / or calculate the power consumption of the fan based on the fan power.

[0014] According to an embodiment of the present invention, the controller is further configured to: perform optimal power control on the compressor according to the compressor power; and / or perform optimal power control on the fan according to the fan power.

[0015] To achieve the above object, an embodiment of the second aspect of the present invention proposes a method for estimating the power of an air conditioner. The air conditioner includes a compressor, a fan, a compressor IPM module for driving the compressor, a fan IPM module for driving the fan, a passive voltage multiplier circuit for supplying direct current to the compressor IPM module and the fan IPM module, and a DC bus capacitor for smoothing the direct current. The method includes: obtaining the DC bus voltage, the average current of the compressor, and the average current of the fan; estimating the compressor power according to the DC bus voltage and the average current of the compressor; estimating the fan power according to the DC bus voltage and the average current of the fan; and summing the compressor power and the fan power to obtain the power of the air conditioner.

[0016] According to the method for estimating the power of an air conditioner according to an embodiment of the present invention, during the operation of the air conditioner, the DC bus voltage, the average current of the compressor, and the average current of the fan are obtained, then the compressor power is estimated according to the DC bus voltage and the average current of the compressor, subsequently the fan power is estimated according to the DC bus voltage and the average current of the fan, and finally the compressor power and the fan power are summed to obtain the power of the air conditioner, thereby realizing the estimation of the power of the air conditioner and without the need to detect the input current in real time, thus effectively improving the applicability of the method.

[0017] To achieve the above object, an embodiment of the third aspect of the present invention proposes a controller, including: a memory, a processor, and a program stored on the memory and executable on the processor. When the processor executes the program, the foregoing method for estimating the power of an air conditioner is implemented.

[0018] According to the controller according to an embodiment of the present invention, through the foregoing method for estimating the power of an air conditioner, the power estimation of the air conditioner can be realized, and there is no need to detect the input current in real time, thus effectively improving the applicability of the controller.

[0019] To achieve the above object, an embodiment of the fourth aspect of the present invention provides an air conditioner, which includes the power estimation device of the aforementioned air conditioner or the aforementioned controller.

[0020] According to the air conditioner of the embodiment of the present invention, through the aforementioned power estimation device or the aforementioned controller, the power estimation of the air conditioner can be realized, the limitation on the power supply mode of the air conditioner is removed, and thus the design difficulty of the air conditioner is reduced.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0022] Figure 1 Schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0023] Figures 2a - 2b Schematic diagram of the current direction of a passive voltage multiplier circuit according to an embodiment of the present invention;

[0024] Figure 3 Schematic waveform diagram of a sampled current according to an embodiment of the present invention;

[0025] Figure 4 Schematic structural diagram of a power estimation device of an air conditioner according to an embodiment of the present invention;

[0026] Figure 5 Schematic structural diagram of a current detection circuit according to an embodiment of the present invention;

[0027] Figure 6 Schematic waveform diagram of a first current sampling signal according to an embodiment of the present invention;

[0028] Figure 7 Flow chart of a power estimation method for an air conditioner according to an embodiment of the present invention;

[0029] Figure 8 Schematic structural diagram of a controller according to an embodiment of the present invention;

[0030] Figures 9a - 9b Schematic structural diagram of an air conditioner according to some embodiments of the present invention. Detailed Embodiments

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0032] The air conditioner and its power estimation device, power estimation method, and controller proposed in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] It should be noted that the power estimation device in the embodiments of the present invention can be applied to various air conditioners. Hereinafter, Figure 1 the power estimation device in the embodiments of the present invention will be described with reference to the air conditioner shown. Figure 1 As shown, the air conditioner 100 includes a compressor 110, a fan 120, a compressor IPM (Intelligent Power Module) module 130, a fan IPM module 140, a passive voltage doubler circuit 150, and a DC bus capacitor C. Among them, the compressor IPM module 130 is used to drive the compressor 110, the fan IPM module 140 is used to drive the fan 120, the passive voltage doubler circuit 150 is used to provide direct current for the compressor IPM module 130 and the fan IPM module 140, and the DC bus capacitor C is used to smooth the direct current.

[0034] Specifically, when the air conditioner 100 needs to operate, the passive voltage doubler circuit 150 provides direct current to the compressor IPM module 130 and the fan IPM module 140. Subsequently, the compressor IPM module 130 and the fan IPM module 140 invert the direct current into alternating current to make the corresponding compressor 110 and fan 120 operate, so that the air conditioner 100 operates normally. Among them, the IPM module is a typical power module, which usually has an inverter circuit, a PFC circuit, etc. The specific principle of the IPM module will not be elaborated here. At the same time, the DC bus capacitor C is used to smooth the direct current to reduce the harmonic components in the direct current. In addition, compared with the conventional rectifier circuit method, the passive voltage doubler circuit 150 in the air conditioner 100 has many advantages such as high conversion efficiency, small volume, and light weight. However, the passive voltage doubler circuit 150 can only collect the alternating current in half a cycle and cannot perform real-time sampling of the input current. Therefore, the calculation scheme of using software sampling to calculate the input alternating voltage and alternating current in the related technology to determine the power of the air conditioner 100 cannot be used.

[0035] The current acquisition function of the passive voltage doubler circuit 150 will be described below with specific examples. Figure 2a Or Figure 2b As shown, the passive voltage doubler circuit 150 can be a two-fold voltage doubler circuit, including two diodes and two electrolytic capacitors, and there is a sampling resistor RCY in the passive voltage doubler circuit 150 to realize the sampling of the input current. The working principle of the passive voltage doubler circuit 150 will not be elaborated here. At this time, in the positive half cycle, the current direction in the passive voltage doubler circuit 150 is as Figure 2aAs shown, there is no current flowing through the sampling resistor RCY at this time. In the negative half-cycle, the current direction in the passive voltage multiplier circuit 150 is as Figure 2b shown. At this time, there is current flowing through the sampling circuit RCY. Therefore, if the frequency of the input alternating current is 50HZ, the input current waveform of the passive voltage multiplier circuit 150 can be as Figure 3 shown. From Figure 3 it can be seen that a conventional current sampling circuit can only collect the alternating current in the negative half-cycle.

[0036] Figure 4 FIG. is a schematic structural diagram of a power estimation device of an air conditioner according to an embodiment of the present invention. Referring to Figure 4 shown, the device 200 includes: a voltage detection circuit 210, a current detection circuit 220, and a controller 230.

[0037] Among them, the voltage detection circuit 210 is used to detect the DC bus voltage; the current detection circuit 220 is used to detect the average current of the compressor and the average current of the fan; the controller 230 is used to estimate the compressor power according to the DC bus voltage and the average current of the compressor, and estimate the fan power according to the DC bus voltage and the average current of the fan, and sum the compressor power and the fan power to obtain the power of the air conditioner 100.

[0038] Specifically, referring to Figure 4 shown, the voltage detection circuit 210 can detect the voltage value of the DC bus capacitor C, and the detection method can include various types. For example, the voltage detection circuit 210 can include a conventional voltage division circuit composed of multiple resistors to detect the DC bus voltage on the DC bus capacitor C, and the specific method is not limited here. In addition, since the DC bus voltage usually needs to be monitored during the control process of the air conditioner 100, the existing hardware circuit of the air conditioner 100 usually has a detection circuit for the DC bus voltage. Therefore, the device 200 of the embodiment of the present invention can directly select the existing hardware circuit to implement the detection of the DC bus voltage, thereby reducing the hardware cost of the power estimation device 200.

[0039] The current detection circuit 220 can detect the average current of the compressor 110 and the average current of the blower 120. Subsequently, the controller 230 can estimate the power of the compressor 110 based on the DC bus voltage detected by the voltage detection circuit 210 and the average current of the compressor 110, and estimate the power of the blower 120 based on the DC bus voltage and the average current of the blower 120. Since during the operation of the air conditioner 100, the power of the air conditioner 100 can be divided into three parts, namely compressor power, blower power, and electronic controller power, and the electronic controller power refers to the power consumed by the on-off of the switching tubes inside the air conditioner 100, which is relatively small compared to the power of the compressor 110 and the blower 120 and can be ignored. Therefore, the power of the compressor and the blower can be summed to obtain the power of the air conditioner. Thus, the power estimation of the air conditioner 100 is achieved. At the same time, since the current detection circuit 220 can detect the average currents of the compressor 110 and the blower 120, there is no need to detect the input current in real time. When the air conditioner 100 provides direct current through the passive voltage doubling circuit 150, the device 200 can still achieve the power estimation of the air conditioner 100, thereby making the applicable scenarios of the device 200 more extensive.

[0040] In the above embodiment, by setting a voltage detection circuit, a current detection circuit, and a controller in the device, where the voltage detection circuit is used to detect the DC bus voltage, and the current detection circuit is used to detect the average current of the compressor and the average current of the blower in the air conditioner. Subsequently, the controller estimates the compressor power based on the DC bus voltage and the average current of the compressor, estimates the blower power based on the DC bus voltage and the average current of the blower, and sums the compressor power and the blower power to obtain the power of the air conditioner, thereby achieving the power estimation of the air conditioner, and there is no need to detect the input current in real time, thus effectively improving the applicability of the device.

[0041] In some embodiments, the current detection circuit 220 includes: a first single-resistor sampling circuit 221 and a first filtering circuit 222. Among them, the first single-resistor sampling circuit 221 is connected to the compressor IPM module 130 and is used to perform single-resistor sampling on the working current of the compressor 110 to obtain a first current sampling signal; the first filtering circuit 222 is connected to the first single-resistor sampling circuit 221 and is used to perform filtering processing on the first current sampling signal to obtain the average current of the compressor.

[0042] Specifically, single-resistor sampling is a typical current sampling method for inverter circuits, and the specific structure can be as Figure 5 shown. Refer to Figure 5As shown, the compressor 110 may include a three-phase motor. At this time, a three-phase inverter circuit may be provided inside the compressor IPM module 130 to invert the direct current input by the passive voltage multiplier circuit 150 into three-phase alternating current to drive the compressor 120 to operate normally. At this time, the first single-resistor sampling circuit 221 may include a first sampling resistor R1. One end of the first sampling resistor R1 is connected to the ground terminal of the compressor IPM module 130, and the other end of the first sampling resistor R1 is grounded to GND. During the driving process of the compressor 120, by obtaining the voltage across both ends of the first sampling resistor RC1 and combining the resistance value of the first sampling resistor RC1, the corresponding first current sampling signal can be obtained. The specific principle of single-resistor sampling will not be elaborated here. During a single PWM cycle of the compressor IPM module 130, the waveform of the first current sampling signal I_comp may be a stepped wave, as Figure 6 shown. Since the fluctuation of the stepped wave is relatively large, it is obviously impossible to be used as the basis for determining the compressor power. Therefore, referring to Figure 5 shown, the current detection circuit 220 further includes a first filter circuit 222. The first filter circuit 222 includes energy storage elements. The first filter circuit 222 can filter the first current signal, and then convert the first current sampling signal with large fluctuations into a compressor average current with a stable waveform.

[0043] As a specific example, the first filter circuit 222 may include a first-order RC filter composed of a single resistor and a single capacitor. The first-order RC filter can convert the first current sampling signal I_comp into a compressor average current Ia_comp with a stable waveform, as Figure 6 shown. Among them, the period of the first current sampling signal is consistent with the PWM control period of the compressor, generally 6 kHz, and the period is 167 us. The compressor average current is consistent with the filtering period of the RC filter. For example, the filtering period of the embodiment of the present invention may be 1 ms. Thus, the current detection circuit realizes the function of detecting the average current of the compressor.

[0044] Optionally, since it is necessary to detect the input current of the compressor IPM module 130 in the control process of the compressor 110, a first sampling resistor R1 is usually provided in the compressor IPM module 130. Therefore, the device 200 can directly use the existing circuit as the first single-resistor sampling circuit 221, thereby further reducing the hardware cost of the device 200.

[0045] In some embodiments, referring to Figure 5As shown in the figure, the current detection circuit 220 includes: a second single-resistor sampling circuit 223 and a second filtering circuit 224. Among them, the second single-resistor sampling circuit 223 is connected to the fan IPM module 140 and is used to perform single-resistor sampling on the working current of the fan 120 to obtain a second current sampling signal; the second filtering circuit 224 is connected to the second single-resistor sampling circuit 223 and is used to perform filtering processing on the second current sampling signal to obtain the average current of the fan.

[0046] Specifically, with reference to Figure 5 As shown in the figure, the fan 120 may include a three-phase motor, and the fan IPM module 140 may include a three-phase drive circuit to invert the direct current input by the passive voltage multiplier circuit 150 into three-phase alternating current to drive the compressor 120 to work properly. The working principle of the second single-resistor sampling circuit 223 is similar to that of the above-mentioned first single-resistor sampling circuit 221, and at the same time, the working principle of the second filtering circuit 224 is similar to that of the above-mentioned first filtering circuit 223. Details are not described herein.

[0047] It should be noted that in the above-mentioned invention embodiments, the first filtering circuit 222 and the second filtering circuit 224 may also include other types of filtering circuits, such as LC filters, etc. The first-order RC filter in the above embodiments is exemplary and does not limit the present application.

[0048] In some embodiments, the controller 230 is specifically configured to: obtain the product of the DC bus voltage and the average current of the compressor to obtain the initial power of the compressor; determine the compressor power range in which the initial power of the compressor is located; and correct the initial power of the compressor based on the correction coefficient corresponding to the compressor power range to obtain the compressor power, where different compressor power ranges correspond to different correction coefficients.

[0049] Specifically, the controller 230 can obtain the DC bus voltage from the voltage detection circuit 210, and then obtain the average current of the compressor from the current detection circuit 220. At this time, the product of the DC bus voltage and the average current of the compressor is the initial power of the compressor. At the same time, during the actual test of the compressor 110, when the compressor power is too large, the detected initial power of the compressor will be slightly smaller than the actual power of the compressor, and the larger the compressor power, the greater the deviation. When the compressor power is too small, the detected initial power of the compressor will be slightly larger than the actual power of the compressor, and the smaller the compressor power, the greater the deviation. Therefore, after obtaining the initial power of the compressor, the correction coefficient can be determined according to the compressor power range in which the initial power of the compressor is located, and the correction coefficient is multiplied by the initial power of the compressor to obtain the compressor power, thereby improving the accuracy of the obtained compressor power.

[0050] For example, if the rated power of the compressor 110 is 750 W, the compressor power range can be divided into three ranges, namely below 500 W, from 500 W to 1000 W, and above 1000 W. At this time, the correction factors for the three ranges can be 0.98, 1, and 1.02 respectively. When the initial power of the compressor 110 is below 500 W, the initial power of the compressor will be slightly greater than the actual power of the compressor. Therefore, 0.98 can be selected as the correction factor at this time to improve the accuracy of the obtained compressor power. Similarly, when the initial power of the compressor 110 is above 1000 W, the initial power of the compressor will be slightly less than the actual power of the compressor. At this time, 1.02 can be selected as the correction factor to improve the accuracy of the obtained compressor power. When the initial power of the compressor 110 is between 500 W and 1000 W, the correction factor can be 1, and the compressor is in the normal operation range, and there is no need to correct the compressor power.

[0051] It should be noted that the method of selecting the correction factor in the above embodiments is exemplary and does not limit the present application. In practical applications, the corresponding correction factor can be selected based on the compressor power and test results to improve the accuracy of the obtained compressor power.

[0052] Optionally, the controller is specifically configured to: obtain the product of the DC bus voltage and the average current of the fan to obtain the initial power of the fan; determine the fan power range in which the initial power of the fan is located; and correct the initial power of the fan based on the correction factor corresponding to the fan power range to obtain the fan power, where different fan power ranges correspond to different correction factors.

[0053] Specifically, the method for obtaining and correcting the fan power of the controller 230 is similar to the method for obtaining and correcting the compressor power described above, and will not be elaborated here specifically.

[0054] Optionally, the controller 230 is further configured to: calculate the power consumption of the air conditioner based on the power of the air conditioner 100; and / or calculate the power consumption of the compressor based on the compressor power; and / or calculate the power consumption of the fan based on the fan power.

[0055] Specifically, after the controller 230 estimates the power of the air conditioner 100, the power consumption of the air conditioner can be obtained according to the power of the air conditioner and the operating time of the air conditioner; at the same time, the controller 230 can obtain the power consumption of the compressor according to the estimated compressor power and the operating time of the compressor; in addition, the controller 230 can also obtain the power consumption of the fan according to the estimated fan power and the operating time of the fan. It should be noted that the controller 230 can have any of the above three functions, thereby making the functions of the controller more comprehensive.

[0056] Optionally, the controller 230 is further configured to: perform optimal power control on the compressor according to the compressor power; and / or, perform optimal power control on the fan according to the fan power.

[0057] Specifically, since the controller 230 can obtain the compressor power and the fan power within a fixed period, the controller 230 can further perform optimal power control on the compressor according to the estimated compressor power, and perform optimal power control on the fan according to the fan power, so as to make the function of the controller more comprehensive. Taking the compressor 110 as an example, the controller 230 may select the control parameters corresponding to the maximum compressor power in the past period of time to control the operation of the compressor, where the control parameters may include parameters such as the switching frequency of the compressor IPM module 120 and the switching control method, and specific limitations are not made here.

[0058] In summary, according to the power estimation device of the air conditioner in the embodiment of the present invention, by setting a voltage detection circuit, a current detection circuit and a controller in the device, where the voltage detection circuit is used to detect the DC bus voltage, and the current detection circuit is used to detect the average current of the compressor and the average current of the fan in the air conditioner; subsequently, the controller estimates the initial compressor power according to the DC bus voltage and the average current of the compressor, and estimates the initial fan power according to the DC bus voltage and the average current of the fan; then, according to the power intervals corresponding to the initial compressor power and the initial fan power, the corresponding correction coefficients are determined to correct the initial compressor power and the initial fan power to obtain the compressor power and the fan power; finally, the compressor power and the fan power are summed to obtain the power of the air conditioner, thereby realizing accurate power estimation of the air conditioner and without the need to detect the input current in real time, thus effectively improving the applicability and accuracy of the power estimation device.

[0059] Corresponding to the above embodiments, the embodiment of the present invention further provides a power estimation method for an air conditioner, where, refer to Figure 1 As shown, the air conditioner 100 includes a compressor 110, a fan 120, a compressor IPM module 130 for driving the compressor 110, a fan IPM module 140 for driving the fan 120, a passive voltage multiplier circuit 150 for supplying direct current to the compressor IPM module 130 and the fan IPM module 140, and a DC bus capacitor C for smoothing the direct current, refer to Figure 7 As shown, the method includes:

[0060] S11, obtaining the DC bus voltage, the average current of the compressor, and the average current of the fan.

[0061] S12, estimating the compressor power according to the DC bus voltage and the average current of the compressor.

[0062] S13. Estimate the power of the fan based on the DC bus voltage and the average current of the fan; sum the compressor power and the fan power to obtain the power of the air conditioner.

[0063] According to an embodiment of the present invention, the method further includes: obtaining the product of the DC bus voltage and the average current of the compressor to obtain the initial compressor power; determining the compressor power range in which the initial compressor power is located; correcting the initial compressor power based on the correction coefficient corresponding to the compressor power range to obtain the compressor power, where different compressor power ranges correspond to different correction coefficients.

[0064] According to an embodiment of the present invention, the method further includes: obtaining the product of the DC bus voltage and the average current of the fan to obtain the initial fan power; determining the fan power range in which the initial fan power is located; correcting the initial fan power based on the correction coefficient corresponding to the fan power range to obtain the fan power, where different fan power ranges correspond to different correction coefficients.

[0065] According to an embodiment of the present invention, the method further includes: calculating the power consumption of the air conditioner based on the power of the air conditioner; and / or calculating the power consumption of the compressor based on the compressor power; and / or calculating the power consumption of the fan based on the fan power.

[0066] According to an embodiment of the present invention, the controller is further configured to: perform optimal power control on the compressor according to the compressor power; and / or perform optimal power control on the fan according to the fan power.

[0067] It should be noted that for the description of the power estimation method of the air conditioner in this application, please refer to the relevant description of the power estimation device of the air conditioner in this application, and details are not elaborated here.

[0068] According to the power estimation method of the air conditioner in the embodiment of the present invention, during the operation of the air conditioner, the DC bus voltage, the average current of the compressor, and the average current of the fan are obtained. Subsequently, the initial compressor power is estimated based on the DC bus voltage and the average current of the compressor, and the initial fan power is estimated based on the DC bus voltage and the average current of the fan; then, according to the power ranges corresponding to the initial compressor power and the initial fan power, the corresponding correction coefficients are determined to correct the initial compressor power and the initial fan power to obtain the compressor power and the fan power; finally, the compressor power and the fan power are summed to obtain the power of the air conditioner, thereby realizing accurate power estimation of the air conditioner and eliminating the need for real-time detection of the input current, thus effectively improving the applicability and accuracy of the power estimation method.

[0069] Corresponding to the above embodiments, the embodiment of the present invention further provides a controller. Refer to Figure 8As shown, the controller 300 includes: a memory 310, a processor 320, and a program stored in the memory 310 and executable on the processor 320. When the processor 320 executes the program, the power estimation method of the foregoing air conditioner is implemented.

[0070] According to the controller of the embodiment of the present invention, through the power estimation method of the foregoing air conditioner, accurate power estimation of the air conditioner can be achieved, and it is not necessary to detect the input voltage and current in real time, thereby effectively improving the applicability and accuracy of the controller.

[0071] Corresponding to the above embodiment, the embodiment of the present invention also provides an air conditioner. Refer to Figure 9a or Figure 9b As shown, the air conditioner 1000 includes the power estimation device 200 of the foregoing air conditioner, or the foregoing controller 300.

[0072] According to the air conditioner of the embodiment of the present invention, through the foregoing power estimation device or the foregoing controller, accurate power estimation of the air conditioner can be achieved, and the limitation on the power supply mode of the air conditioner is lifted, thereby improving the reliability of the air conditioner and reducing the design difficulty of the air conditioner.

[0073] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or in combination with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0074] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logical functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A power estimation device for an air conditioner, characterized in that, the air conditioner includes a compressor, a blower, a compressor IPM module for driving the compressor, a blower IPM module for driving the blower, a passive voltage multiplier circuit for supplying direct current to the compressor IPM module and the blower IPM module, and a DC bus capacitor for smoothing the direct current. The device includes: a voltage detection circuit for detecting the DC bus voltage; a current detection circuit for detecting the average current of the compressor and the average current of the blower; a controller for estimating the compressor power based on the DC bus voltage and the average current of the compressor, estimating the blower power based on the DC bus voltage and the average current of the blower, and summing the compressor power and the blower power to obtain the power of the air conditioner.

2. The device according to claim 1, characterized in that, the current detection circuit includes: a first single-resistor sampling circuit connected to the compressor IPM module for performing single-resistor sampling on the operating current of the compressor to obtain a first current sampling signal; a first filtering circuit connected to the first single-resistor sampling circuit for filtering the first current sampling signal to obtain the average current of the compressor.

3. The device according to claim 1, characterized in that, the current detection circuit includes: a second single-resistor sampling circuit connected to the blower IPM module for performing single-resistor sampling on the operating current of the blower to obtain a second current sampling signal; a second filtering circuit connected to the second single-resistor sampling circuit for filtering the second current sampling signal to obtain the average current of the blower.

4. The device according to claim 1, characterized in that, the controller is specifically configured to: obtain the product of the DC bus voltage and the average current of the compressor to obtain the initial compressor power; determine the compressor power range in which the initial compressor power is located; correct the initial compressor power based on the correction factor corresponding to the compressor power range to obtain the compressor power, where different compressor power ranges correspond to different correction factors.

5. The device according to claim 1, characterized in that, the controller is specifically configured to: obtain the product of the DC bus voltage and the average current of the blower to obtain the initial blower power; determine the blower power range in which the initial blower power is located; correct the initial blower power based on the correction factor corresponding to the blower power range to obtain the blower power, where different blower power ranges correspond to different correction factors.

6. The device according to any one of claims 1-5, characterized in that, the controller is further configured to: calculate the power consumption of the air conditioner based on the power of the air conditioner; and / or calculate the power consumption of the compressor based on the compressor power; and / or calculate the power consumption of the blower based on the blower power.

7. The device according to any one of claims 1-5, wherein, the controller is further configured to: perform optimal power control on the compressor according to the compressor power; and / or, perform optimal power control on the blower according to the blower power.

8. A method for estimating the power of an air conditioner, wherein, the air conditioner includes a compressor, a blower, a compressor IPM module for driving the compressor, a blower IPM module for driving the blower, a passive voltage multiplier circuit for supplying direct current to the compressor IPM module and the blower IPM module, and a DC bus capacitor for smoothing the direct current, and the method includes: acquiring the DC bus voltage, the average current of the compressor, and the average current of the blower; estimating the compressor power according to the DC bus voltage and the average current of the compressor; estimating the blower power according to the DC bus voltage and the average current of the blower; summing the compressor power and the blower power to obtain the power of the air conditioner.

9. A controller, wherein, it includes: a memory, a processor, and a program stored on the memory and executable on the processor, and when the processor executes the program, it implements the method for estimating the power of the air conditioner according to claim 8.

10. An air conditioner, wherein, it includes the power estimation device of the air conditioner according to any one of claims 1-7, or the controller according to claim 9.

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