Compressor control device and air conditioner

Abstract

The embodiment of the invention relates to the field of electronic power, and discloses a compressor control device and an air conditioner. The compressor control device comprises a boosting module, a compressor driving module and a control module, and the boosting module is used for conducting boosting and power correction on direct-current voltage provided by the direct-current power source; the compressor driving module is used for driving the compression motor to work according to the boost output by the boost module and the direct-current voltage after power correction; the control module is used for generating a first control signal according to the given boost voltage of the boost module and the input current of the boost module so as to control the working state of the boost module, and is further used for controlling the working state of the boost module according to the three-phase current output by the compressor driving module and the position and the rotating speed of the compression motor. And generating a second control signal to control the working state of the compressor. The energy consumption of the compressor of the air conditioner can be reduced by increasing the power supply voltage of the compression motor, so that the energy efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electronic power, and in particular to a compressor control device and an air conditioner. Background Art

[0002] Air conditioners have become an indispensable household appliance, with an annual demand of tens of millions. As a high-power appliance, air conditioners account for a large proportion of electricity consumption. At the same time, many places have experienced tripping due to excessive power consumption. Some old lines have caused short circuits and fires due to the use of air conditioners.

[0003] Improving the energy efficiency of air conditioners and reducing power loss can greatly improve the power consumption of air conditioners. Moreover, considering the large volume of air conditioners, reducing the loss by 1% can make a great contribution to energy conservation and emission reduction. Therefore, improving the energy efficiency of air conditioners is so important. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to at least provide a compressor control device and an air conditioner, which can at least solve the problem of how to improve the energy efficiency of the air conditioner, and at least reduce the energy consumption of the compressor of the air conditioner to improve the energy efficiency of the air conditioner.

[0005] In order to solve the above technical problems, at least one embodiment of the present application provides a compressor control device, including a boost module, a compressor drive module and a control module, wherein:

[0006] The input end of the boost module is connected to a DC power supply, the output end of the boost module is connected to a compressor of an air conditioner, and the boost module is used to boost and power correct the DC voltage provided by the DC power supply;

[0007] The input end of the compressor driving module is connected to the output end of the boost module, and the output end of the compressor driving module is connected to the compression motor. The compressor driving module is used to drive the compression motor to work according to the boosted and power-corrected DC voltage output by the boost module;

[0008] The control module is used to generate a first control signal to control the working state of the boost module according to the given boost voltage of the boost module and the input current of the boost module, and is also used to generate a second control signal to control the working state of the compressor according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

[0009] In some embodiments, the control module is also used to determine the speed of the compression motor according to the user's demand for cooling capacity of the air conditioner, and generate the second control signal according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

[0010] In some embodiments, the control module is used to calculate the duty cycle of the drive PWM of the compressor drive module using the FOC algorithm based on the three-phase current output by the compressor drive module and the position and speed of the compression motor, and generate the second control signal based on the calculated duty cycle of the drive PWM of the compressor drive module.

[0011] In some embodiments, the compressor control device further includes a fan drive module, the input end of the fan drive module is connected to the output end of the boost module, the output end of the fan drive module is connected to the fan, and the fan drive module is used to drive the speed of the fan according to the boosted and power-corrected DC voltage output by the boost module;

[0012] The control module is also used to determine the duty cycle of the drive PWM of the fan driving module according to the cooling capacity of the air conditioner requested by the user, and generate a third control signal according to the duty cycle of the drive PWM of the fan driving module to control the speed of the fan.

[0013] In some embodiments, the control module is used to calculate the duty cycle of the driving PWM of the boost module according to the given boost voltage of the boost module and the input current of the boost module using a PFC algorithm, and generate the first control signal according to the calculated duty cycle of the driving PWM of the boost module.

[0014] In some embodiments, the boost module includes a voltage doubling circuit and a PFC circuit connected in sequence.

[0015] In some embodiments, the boost module includes a PFC circuit and an LLC transformer circuit connected in sequence.

[0016] In some embodiments, the PFC circuit is any one of a single-phase boost circuit, a single-phase Vienna circuit, a bridgeless totem pole circuit, and an interleaved boost circuit composed of an inductor.

[0017] At least one embodiment of the present application further provides an air conditioner, comprising a compression motor and the compressor control device as described above, wherein the compression motor is connected to an output end of the compressor control device.

[0018] Compared with the prior art, the compressor control device and air conditioner provided in the embodiments of the present application use a boost module to boost and power correct the DC power provided by the DC power supply to provide a voltage higher than the currently applied voltage to the compressor drive module, and drive and control the compressor drive module and the boost module through the control module to reduce the working current of the compression motor, thereby reducing the loss due to current conduction and shutdown, which can improve the operating frequency and efficiency of the compression motor, reduce the energy consumption of the compressor of the air conditioner, and improve the energy efficiency of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 is a structural schematic diagram of a compressor control device provided according to an embodiment of the present invention;

[0021] Figure 2 is a structural schematic diagram of a compressor control device provided according to another embodiment of the present invention;

[0022] Figure 3 2 is a schematic structural diagram of an air conditioner provided according to another embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0024] Embodiment 1:

[0025] The embodiments of the present invention relate to a compressor control device. Compared with the prior art, the embodiments of the present invention use a boost module to boost and power correct the DC voltage provided by the DC power supply to provide a higher voltage than the currently applied voltage to the compressor drive module, and drive and control the compressor drive module and the boost module through a control module to reduce the current of the compression motor, thereby reducing the loss caused by the current conduction and shutdown, which can improve the operating frequency and efficiency of the compression motor, reduce the energy consumption of the air conditioner compressor, and improve the energy efficiency of the air conditioner. Therefore, the problem of how to improve the energy efficiency of the air conditioner is solved.

[0026] The implementation details of the compressor control device of this embodiment are described in detail below. The following content is only provided for easy understanding of the implementation details and is not necessary for implementing this solution.

[0027] An embodiment of the present invention provides a compressor control device, such as Figure 1 As shown, it includes a boost module, a compressor drive module, a control module and a switching power supply.

[0028] The switching power supply is used to convert the DC voltage provided by the DC power supply into a first specified voltage and a second specified voltage, the first specified voltage being used as a driving voltage for power devices in the boost module and the compressor drive module, and the second specified voltage being used to power the control module.

[0029] The input end of the boost module is connected to a DC power supply, and the output end of the boost module is connected to a compressor of an air conditioner. The boost module is used to boost and power correct the DC voltage provided by the DC power supply.

[0030] Specifically, the boost module may include a voltage doubling circuit and a PFC (Power Factor Correction) circuit connected in sequence, or the boost module includes a PFC circuit and an LLC (Inductor-Inductor-Capacitor) transformer circuit connected in sequence, or the boost module includes a PFC circuit, etc. The PFC circuit is any one of a single-phase boost circuit, a single-phase Vienna circuit, a bridgeless totem pole circuit, and an interleaved boost circuit composed of an inductor. The DC voltage provided by the DC power supply can be raised to a certain voltage by the voltage doubling circuit, and then the PFC circuit is used for power correction. Such a boost module circuit is simple, but the control of the voltage doubling circuit is relatively complex. Alternatively, the PFC circuit is used to perform a first-stage boost, and then the LLC transformer circuit is used to perform the boost. This method has a relatively high cost and is relatively complex to control. Alternatively, the PFC circuit is directly used for voltage boost and power correction. This method has the simplest circuit, but the control is also relatively complex. The boost circuit can raise the DC voltage to a higher voltage than the current 400V, such as 540V, 800V, etc., and provide a high voltage power supply for the compressor drive circuit at the rear end.

[0031] The input end of the compressor driving module is connected to the output end of the boost module, and the output end of the compressor driving module is connected to the compression motor. The compressor driving module is used to drive the compression motor to work according to the boosted and power-corrected DC voltage output by the boost module.

[0032] Specifically, after the DC voltage is boosted, the speed of the compression motor can be doubled. For example, it can run at 300 rpm instead of 150 rpm before. However, the current compression motor design's pressure resistance and structural capacity under higher power state are insufficient, so the boost module is designed. At the same time, the compression motor is designed to improve the wire diameter pressure resistance, increase the internal safety spacing, and strengthen the rotor structure. For example, the motor winding of the compression motor selects more pressure-resistant enameled wire, and the safety spacing of the terminal must meet the 800V pressure resistance. The compression motor needs to be designed with a stronger structure or material, or use a higher-grade lubricant. The boost module provides a high-voltage power supply to the compressor drive module, thereby increasing the reverse electromotive force of the compression motor, so that the compression motor can run at a higher speed, increase the operating frequency of the compressor, and then the small compression motor can also achieve the working capacity of a large compression motor. At the same time, the current of the compression motor under the same working conditions can be reduced, reducing the conduction loss of the copper wire. This is conducive to the miniaturization and high efficiency of the compression motor.

[0033] The control module is used to generate a first control signal to control the working state of the boost module according to the given boost voltage of the boost module and the input current of the boost module, and is also used to generate a second control signal to control the working state of the compressor according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

[0034] In some embodiments, the control module is also used to determine the speed of the compression motor according to the user's demand for cooling capacity of the air conditioner, and generate the second control signal according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

[0035] Specifically, the control module is used to calculate the duty cycle of the drive PWM (Pulse width modulation) of the compressor drive module according to the three-phase current output by the compressor drive module and the position and speed of the compression motor, using the FOC (Field-Oriented Control) algorithm, and generate the second control signal according to the calculated duty cycle of the drive PWM of the compressor drive module.

[0036] In some embodiments, the control module is used to calculate the duty cycle of the driving PWM of the boost module according to the given boost voltage of the boost module and the input current of the boost module by using a PFC (Power Factor Correction) algorithm, and generate the first control signal according to the calculated duty cycle of the driving PWM of the boost module.

[0037] In some embodiments, Figure 2 As shown, the compressor control device also includes a fan drive module, the input end of the fan drive module is connected to the output end of the boost module, the output end of the fan drive module is connected to the fan, and the fan drive module is used to drive the speed of the fan according to the boosted and power-corrected DC voltage output by the boost module. The control module is also used to determine the duty cycle of the drive PWM of the fan drive module according to the cooling capacity of the air conditioner required by the user, and generate a third control signal according to the duty cycle of the drive PWM of the fan drive module to control the speed of the fan.

[0038] Specifically, after increasing the power supply voltage, the fan drive circuit also uses a high-voltage circuit design, which can reduce its operating current. At the same time, under the high power supply voltage state, it is beneficial to increase the operating frequency of the motor, increase the speed, and facilitate the miniaturization of the fan.

[0039] The compressor control device provided in this embodiment reduces the operating current of the compression motor and the fan by increasing the power supply voltage to the compression motor and the fan, thereby reducing the loss caused by current conduction, increasing the operating frequency and efficiency of the compression motor and the fan, and achieving the effect of miniaturization of the motor and improvement of efficiency.

[0040] Embodiment 2

[0041] The embodiment of the present invention further provides an air conditioner, such as Figure 3 As shown, it includes a compression motor, a fan, a switching power supply and the compressor control device as described in the above embodiment. The switching power supply is connected to the input end of the compressor control device, and the compression motor and the fan are connected to the output end of the compressor control device. The compressor control device includes a boost module, a compressor drive module, a fan drive module and a control module.

[0042] Specifically, after the household 220V AC passes through the electromagnetic compatibility (EMC) module, it enters the rectifier module for rectification, and the AC is rectified into a DC voltage, and the DC voltage obtained by rectification is used as a DC power supply. The DC power supply provides a DC voltage to the switching power supply. The DC voltage received by the switching power supply is converted into a first specified voltage (such as 15V) and a second specified voltage (such as 12V) by the transformer of the switching power supply. The first specified voltage is provided to the boost module, the compressor drive module and the fan drive module as the driving voltage of their switching devices. The third specified voltage (such as 3.3V) generated by the conversion of the second specified voltage is provided to the control module as the working voltage of the control module.

[0043] The boost module boosts and performs power correction on the DC voltage provided by the DC power supply, and provides the boosted and power corrected DC voltage to the compressor drive module to drive the compression motor to work, and to the fan drive module to control the speed of the fan.

[0044] The control module takes into account the PFC algorithm, the FOC algorithm for the compressor motor and the fan drive. The control module uses the PFC algorithm to calculate the duty cycle of the drive PWM of the boost module according to the given boost voltage of the boost module and the input current of the boost module, and generates the first control signal according to the calculated duty cycle of the drive PWM of the boost module to control the working state of the boost module. And the control module determines the speed of the compressor motor according to the user's demand for the cooling capacity of the air conditioner, and uses the FOC algorithm to calculate the duty cycle of the drive PWM of the compressor drive module according to the three-phase current output by the compressor drive module and the position and speed of the compressor motor, and controls the working state of the compressor according to the calculated duty cycle of the drive PWM of the compressor drive module. The control module also determines the duty cycle of the drive PWM of the fan drive module according to the user's demand for the cooling capacity of the air conditioner, and generates a third control signal according to the duty cycle of the drive PWM of the fan drive module to control the speed of the fan.

[0045] In this embodiment, the air conditioner is equipped with a compressor control device as described in the above embodiment, so it is also possible to reduce the current of the compression motor and the fan, thereby reducing the loss caused by the current conduction and shutdown, and can increase the operating frequency and efficiency of the compression motor, thereby reducing the energy consumption of the compressor and fan of the air conditioner, thereby improving the energy efficiency of the air conditioner.

[0046] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, the technical features of the above-mentioned embodiments can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification, and various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A compressor control device, characterized in that: It includes a boost module, a compressor drive module and a control module, wherein: The input end of the boost module is connected to a DC power supply, the output end of the boost module is connected to a compressor of an air conditioner, and the boost module is used to boost and power correct the DC voltage provided by the DC power supply; The input end of the compressor driving module is connected to the output end of the boost module, and the output end of the compressor driving module is connected to the compression motor. The compressor driving module is used to drive the compression motor to work according to the boosted and power-corrected DC voltage output by the boost module; The control module is used to generate a first control signal to control the working state of the boost module according to the given boost voltage of the boost module and the input current of the boost module, and is also used to generate a second control signal to control the working state of the compressor according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

2. The compressor control device according to claim 1, characterized in that: The control module is also used to determine the speed of the compression motor according to the user's demand for cooling capacity of the air conditioner, and generate the second control signal according to the three-phase current output by the compressor drive module and the position and speed of the compression motor.

3. The compressor control device according to claim 1 or 2, characterized in that: The control module is used to calculate the duty cycle of the drive PWM of the compressor drive module using the FOC algorithm according to the three-phase current output by the compressor drive module and the position and speed of the compression motor, and generate the second control signal according to the calculated duty cycle of the drive PWM of the compressor drive module.

4. The compressor control device according to claim 1, characterized in that: It also includes a fan drive module, the input end of the fan drive module is connected to the output end of the boost module, the output end of the fan drive module is connected to the fan, and the fan drive module is used to control the speed of the fan according to the boosted and power-corrected DC voltage output by the boost module; The control module is also used to determine the duty cycle of the drive PWM of the fan driving module according to the cooling capacity of the air conditioner requested by the user, and generate a third control signal according to the duty cycle of the drive PWM of the fan driving module to control the speed of the fan.

5. The compressor control device according to claim 1, characterized in that: The control module is used to calculate the duty cycle of the driving PWM of the boost module according to the given boost voltage of the boost module and the input current of the boost module using the PFC algorithm, and generate the first control signal according to the calculated duty cycle of the driving PWM of the boost module.

6. The compressor control device according to claim 1, characterized in that: The boost module includes a voltage doubling circuit and a PFC circuit which are connected in sequence.

7. The compressor control device according to claim 1, characterized in that: The boost module includes a PFC circuit and an LLC transformer circuit which are connected in sequence.

8. The compressor control device according to claim 1, characterized in that: The boost module includes a PFC circuit.

9. The compressor control device according to any one of claims 6 to 8, characterized in that: The PFC circuit is any one of a single-phase boost circuit, a single-phase Vienna circuit, a bridgeless totem pole circuit, and an interleaved boost circuit composed of an inductor.

10. An air conditioner, characterized in that: It comprises a compression motor and a compressor control device as claimed in any one of claims 1 to 9, wherein the compression motor is connected to an output end of the compressor control device.

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