Voltage regulation circuit and method and electronic equipment

Abstract

The invention provides a voltage regulation circuit, a voltage regulation method and electronic equipment. The voltage regulation circuit provided by the invention is provided with a first voltage input unit and a second voltage input unit, and the first voltage input unit is used for providing bus voltage; the second voltage input unit is used for providing required voltage according to the working mode of the system; the voltage adjusting unit is connected with the first voltage input unit and the second voltage input unit, is used for outputting a field weakening control signal based on the bus voltage and the required voltage, and is also used for generating a bus reference voltage based on the bus voltage and the required voltage; and adjusting the bus voltage by using the bus reference voltage. According to the voltage regulation circuit, the bus voltage can be adaptively and dynamically regulated according to the working mode of the system, the operation efficiency of the whole machine is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of variable frequency air conditioner motor control, and particularly to a voltage regulation circuit, method and electronic device. Background Art

[0002] BOOST (boost converter) power factor correcting (PFC) converters are widely used in the outdoor units of variable frequency air conditioners to provide a stable and reliable DC voltage for the compressor drive of the subsequent inverter circuit.

[0003] The frequency range of the air conditioner compressor is usually between 10 Hz and 120 Hz, which is relatively wide. The existing method of using a fixed higher bus voltage will result in a lower overall efficiency of the compressor in the low frequency range and a higher overall energy consumption. Summary of the Invention

[0004] The present invention mainly provides a voltage regulation circuit, method and electronic device, which can dynamically adjust the bus voltage according to the working mode of the system, improve the overall operation efficiency and reduce the energy consumption.

[0005] To solve the above technical problems, the first technical solution adopted by the present invention is: to provide a voltage regulation circuit, including: A first voltage input unit for providing a bus voltage; A second voltage input unit for providing a required voltage according to the working mode of the system; A voltage regulation unit connected to the first voltage input unit and the second voltage input unit, for outputting a field weakening control signal based on the bus voltage and the required voltage. The voltage regulation unit is also used to generate a bus reference voltage based on the bus voltage and the required voltage, and adjust the bus voltage using the bus reference voltage.

[0006] In one embodiment, the voltage regulation unit is used to synthesize the bus voltage and the required voltage using a first synthesis algorithm to obtain a field weakening control signal; and synthesize the bus voltage and the required voltage using a second synthesis algorithm to obtain an initial compensation voltage, and obtain a bus reference voltage based on the initial compensation voltage.

[0007] In one embodiment, the voltage regulation unit includes: A field weakening control unit connected to the first voltage input unit and the second voltage input unit, for synthesizing the bus voltage and the required voltage using a first synthesis algorithm; A voltage control unit connected to the first voltage input unit and the second voltage input unit, for synthesizing the bus voltage and the required voltage using a second synthesis algorithm to obtain an initial compensation voltage, and obtaining a bus reference voltage based on the initial compensation voltage.

[0008] In one embodiment, the field weakening control unit includes: A first calculation unit, connected to the first voltage input unit and the second voltage input unit, for calculating a first differential voltage between the bus voltage and the required voltage; A control unit, connected to the first calculation unit, for processing the first differential voltage to obtain a field weakening control signal.

[0009] In one embodiment, the control unit includes: a proportional-integral control unit and a first limiting unit, the proportional-integral control unit is connected to the first calculation unit, and the first limiting unit is connected to the proportional-integral control unit.

[0010] In one embodiment, the voltage control unit includes: A second calculation unit, connected to the first voltage input unit and the second voltage input unit, for synthesizing the bus voltage and the required voltage by using a second synthesis algorithm to obtain an initial compensation voltage; A third calculation unit and a reference voltage input unit, the third calculation unit is connected to the second calculation unit and the reference voltage input unit, for obtaining a bus reference voltage based on the initial compensation voltage and the reference voltage provided by the reference voltage input unit; A compensation unit, connected to the third calculation unit and the first voltage input unit, for adjusting the bus voltage based on the bus reference voltage.

[0011] In one embodiment, the second calculation unit includes: A first coefficient adjustment unit, connected to the first voltage input unit, for adjusting the bus voltage by using a first coefficient; A differential calculation unit, connected to the first coefficient adjustment unit and the second voltage input unit, for calculating a second differential voltage between the required voltage and the bus voltage adjusted by the first coefficient; An algorithm processing unit, connected to the differential calculation unit, for performing integral processing on the second differential voltage; the algorithm processing unit includes one of an integral control unit, a proportional-integral control unit, and a proportional-integral-derivative control unit; A second limiting unit, connected to the algorithm processing unit, for processing the output of the algorithm processing unit to obtain an initial compensation voltage.

[0012] In one embodiment, the third calculation unit includes: A first addition calculation unit, connected to the reference voltage input unit and the second calculation unit, for calculating the sum of the reference voltage and the initial compensation voltage; A third limiting unit, connected to the first addition calculation unit, for processing the output of the first addition calculation unit to obtain a bus reference voltage.

[0013] In one embodiment, the reference voltage input unit includes: A reference voltage source for providing an alternating voltage; An effective value calculation unit connected to the reference voltage source for processing the alternating voltage to obtain an initial reference voltage; A second coefficient adjustment unit connected to the effective value calculation unit for adjusting the initial reference voltage by using a second coefficient; A second addition calculation unit connected to the second coefficient adjustment unit and receiving a preset voltage for calculating the sum of the initial reference voltage and the preset voltage to obtain a reference voltage.

[0014] In one embodiment, in response to a first operating mode, a second voltage input unit provides a first required voltage, and a voltage adjustment unit synthesizes a bus voltage and the first required voltage by using a first synthesis algorithm to obtain a field weakening control signal; and synthesizes the bus voltage and the first required voltage by using a second synthesis algorithm to obtain a first initial compensation voltage, and obtains a first bus reference voltage based on the first initial compensation voltage; In response to a second operating mode, the second voltage input unit provides a second required voltage, and the voltage adjustment unit synthesizes the bus voltage and the second required voltage by using the first synthesis algorithm to obtain a field weakening control signal; and synthesizes the bus voltage and the second required voltage by using the second synthesis algorithm to obtain a second initial compensation voltage, and obtains a second bus reference voltage based on the second initial compensation voltage; Wherein, the first initial compensation voltage is greater than the second initial compensation voltage.

[0015] In one embodiment, in response to the system frequency being in an increasing state and the load increasing, it is in the first operating mode; In response to the system frequency being in a decreasing state and the load decreasing, it is in the second operating mode.

[0016] To solve the above technical problems, the second technical solution adopted by the present invention is: to provide a voltage adjustment method, including: Obtaining a bus voltage and obtaining a required voltage according to the operating mode of the system; Generating a field weakening control signal based on the bus voltage and the required voltage; Generating a bus reference voltage based on the bus voltage and the required voltage, and adjusting the bus voltage by using the bus reference voltage.

[0017] In one embodiment, the step of generating a field weakening control signal based on the bus voltage and the required voltage includes: synthesizing the bus voltage and the required voltage by using a first synthesis algorithm to generate a field weakening control signal; The steps of generating a bus reference voltage based on the bus voltage and the required voltage include: synthesizing the bus voltage and the required voltage through a second synthesis algorithm to generate an initial compensation voltage, and obtaining the bus reference voltage based on the initial compensation voltage.

[0018] In one embodiment, the first synthesis algorithm includes: calculating a first difference voltage between the bus voltage and the required voltage, performing proportional-integral processing on the first difference voltage and limiting the amplitude to generate a field weakening control signal; The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient and then calculating a second difference voltage from the required voltage, performing integral and amplitude limiting processing on the second difference voltage to generate an initial compensation voltage.

[0019] In one embodiment, the steps of obtaining the bus reference voltage based on the initial compensation voltage include: Obtaining a reference voltage; Adding the initial compensation voltage to the reference voltage and performing amplitude limiting processing on the added result to generate the bus reference voltage.

[0020] In one embodiment, the steps of obtaining the reference voltage include: Collecting an AC voltage and calculating its effective value to obtain an initial reference voltage; Multiplying the initial reference voltage by a second coefficient and then superimposing a preset voltage to generate the reference voltage.

[0021] In one embodiment, the steps of obtaining the required voltage according to the working mode of the system include: In response to a first working mode, obtaining a first required voltage; The steps of generating a field weakening control signal based on the bus voltage and the required voltage include: obtaining the field weakening control signal based on the bus voltage and the first required voltage; The steps of generating a bus reference voltage based on the bus voltage and the required voltage include: obtaining a first bus reference voltage based on the bus voltage and the first required voltage.

[0022] In one embodiment, the steps of obtaining the required voltage according to the working mode of the system include: In response to a second working mode, obtaining a second required voltage; The steps of generating a field weakening control signal based on the bus voltage and the required voltage include: obtaining the field weakening control signal based on the bus voltage and the second required voltage; The steps of generating a bus reference voltage based on the bus voltage and the required voltage include: obtaining a second bus reference voltage based on the bus voltage and the second required voltage; Wherein, the first bus reference voltage is determined by a first initial compensation voltage, the second bus reference voltage is determined by a second initial compensation voltage, and the first initial compensation voltage is greater than the second initial compensation voltage.

[0023] In one embodiment, in response to the system frequency being in an increasing state and the load increasing, it is determined that the system is in the first operating mode; In response to the system frequency being in a decreasing state and the load decreasing, it is determined that the system is in the second operating mode.

[0024] To solve the above technical problems, the third technical solution adopted by the present invention is: to provide an electronic device including the voltage adjustment circuit of any one of the above.

[0025] The beneficial effects of the present invention are as follows: Different from the prior art, the voltage adjustment circuit provided by the present invention is provided with a first voltage input unit and a second voltage input unit. The first voltage input unit is used to provide the bus voltage; the second voltage input unit is used to provide the required voltage according to the operating mode of the system; the voltage adjustment unit is connected to the first voltage input unit and the second voltage input unit, and is used to output a field weakening control signal based on the bus voltage and the required voltage. The voltage adjustment unit is also used to generate a bus reference voltage based on the bus voltage and the required voltage, and use the bus reference voltage to adjust the bus voltage. The voltage adjustment circuit of the present application can adaptively and dynamically adjust the bus voltage according to the operating mode of the system, improve the overall operating efficiency of the machine, and reduce energy consumption. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 Structural schematic diagram of the first embodiment of the voltage adjustment circuit of the present application; Figure 2 Structural schematic diagram of the second embodiment of the voltage adjustment circuit of the present application; Figure 3 For Figure 2 Structural schematic diagram of one embodiment of the field weakening control unit in Figure 4 For Figure 2 Structural schematic diagram of the first embodiment of the voltage control unit in Figure 5 For Figure 2 Structural schematic diagram of the second embodiment of the voltage control unit in Figure 6 Flow schematic diagram of one embodiment of the voltage adjustment method of the present application; Figure 7 Structural schematic diagram of one embodiment of the electronic device of the present application. Detailed implementation manners

[0028] The following will combine with the accompanying drawings of the specification to detail the solutions of the embodiments of the present application.

[0029] In the following description, specific details such as specific system architectures, interfaces, technologies, etc. are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the present application.

[0030] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after. In addition, "multiple" in this article means two or more than two.

[0031] Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in this article are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0032] Before further detailing the embodiments of the present application, the nouns and terms involved in the embodiments of the present application are described. The nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0033] By analyzing the efficiency characteristics of the inverter and PFC at different bus voltages, it can be known that: the lower the amplitude of the bus voltage, the usually lower the switching loss of the inverter. The lower bus voltage results in smaller voltage stress during the switching process, so the switching loss is reduced and the efficiency is improved. In the PFC converter, the lower bus voltage also helps to reduce the switching loss. The main task of the PFC is to convert the input AC voltage into a stable DC bus voltage. The lower bus voltage means a smaller voltage conversion amount, thereby reducing the switching loss.

[0034] Under normal existing circumstances, if the load and / or frequency of the system increase, in order to ensure that the motor can provide the corresponding rotational speed, the system will enter the field-weakening state (field-weakening means reducing the excitation current to weaken the main pole magnetic flux, so that the motor can increase the rotational speed without increasing the armature voltage). The present application provides an adaptive bus voltage adjustment strategy, which dynamically adjusts the bus voltage through this strategy, thereby reducing the switching losses in the inverter and the PFC converter and improving the overall energy efficiency. However, this optimization must be carefully handled to ensure that it does not affect the compressor motor control performance, especially to avoid entering the field-weakening state (the purpose of bus voltage adjustment is to match the working mode of the system, such as the load size or frequency size). In compressor motor control, the bus voltage cannot be too low, otherwise it may cause the motor control system to not obtain enough voltage for precise adjustment, resulting in reduced efficiency or stability problems. Therefore, it is necessary to find the minimum bus voltage that can achieve driving, which can maximize the efficiency of the inverter and the PFC converter and avoid the decline of the compressor motor control performance.

[0035] In view of this, the present application provides a voltage adjustment circuit, which includes: a first voltage input unit, a second voltage input unit, and a voltage adjustment unit. The first voltage input unit is used to provide the bus voltage; the second voltage input unit is used to provide the required voltage according to the working mode of the system; the voltage adjustment unit is connected to the first voltage input unit and the second voltage input unit, and is used to output a field-weakening control signal based on the bus voltage and the required voltage. The voltage adjustment unit is also used to generate a bus reference voltage based on the bus voltage and the required voltage, and use the bus reference voltage to adjust the bus voltage. An appropriate bus voltage can prevent the control system from entering the field-weakening state. It can dynamically adjust the bus voltage according to the working mode of the system, improve the operating efficiency of the whole machine, and reduce energy consumption.

[0036] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0037] See Figure 1 , Figure 1Schematic diagram of the structure of the first embodiment of the voltage adjustment circuit of the present application, specifically including: a first voltage input unit 11, a second voltage input unit 12, and a voltage adjustment unit 13. Among them, the first voltage input unit is used to provide the bus voltage; the second voltage input unit 12 is used to provide the required voltage according to the working mode of the system. The voltage adjustment unit 13 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is used to output a field weakening control signal based on the bus voltage and the required voltage. The voltage adjustment unit 13 is also used to generate a bus reference voltage based on the bus voltage and the required voltage, and use the bus reference voltage to adjust the bus voltage. Adjusting the bus voltage using the bus reference voltage can, on the one hand, improve the overall operating efficiency of the machine and reduce energy consumption, and on the other hand, can also provide an appropriate bus voltage to prevent the system from entering the field weakening state.

[0038] It should be noted that the voltage adjustment unit 13 of the present application includes two ports. One port is connected to the first voltage input unit 11 and the second voltage input unit 12 to receive the bus voltage and the required voltage, and the other port is directly connected to the first voltage input unit 11 to transmit the bus reference voltage, and use the bus reference voltage to adjust the bus voltage provided by the first voltage input unit 11.

[0039] It should be noted that the voltage adjustment circuit of the present application dynamically adjusts the bus voltage according to the working mode of the system. The key is to find the minimum bus voltage that drives the system to work. Therefore, the present application sets the second voltage input unit 12. The second voltage input unit 12 provides the required voltage according to the working mode of the system. Subsequently, the bus reference voltage is obtained based on the bus voltage and the required voltage, and the bus voltage is adjusted using the bus reference voltage, so as to ensure that the adjusted bus voltage is the minimum voltage matching the working mode of the system, which can reduce the switching losses in the inverter and the PFC converter, improve the overall operating efficiency of the machine, and reduce energy consumption. During this process, a field weakening control signal is also output based on the bus voltage and the required voltage to ensure the stability and controllability of the dynamic adjustment of the bus voltage.

[0040] In an embodiment of the present application, the first voltage input unit 11 can also set a coefficient 1 / sqrt(3) to adjust the initial bus voltage, so as to provide the bus voltage. This can enable the bus voltage to meet the voltage change requirements of the voltage adjustment circuit.

[0041] In another embodiment of the present application, the second voltage input unit 12 can also be set to provide two sub-required voltages, namely Uα and U β , respectively for U α and U βPerform a square calculation and summation, take the square root of the summation result, and finally obtain the required voltage. It should be noted that in the fields of motor control and the like, the analysis method based on the α-β coordinate system is used to calculate the vector amplitudes Uα and U of the voltage β which can be regarded as the two components of the voltage vector in the α-β coordinate system. Through the operation of squaring and then taking the square root, the amplitude of the voltage vector (i.e., the required voltage) can be obtained, thereby realizing the precise control of the electrode torque and speed.

[0042] In an embodiment of the present application, the voltage adjustment unit 13 is used to synthesize the bus voltage and the required voltage by using the first synthesis algorithm to obtain a field weakening control signal; synthesize the bus voltage and the required voltage by using the second synthesis algorithm to obtain an initial compensation voltage, and obtain a bus reference voltage based on the initial compensation voltage.

[0043] Specifically, please combine Figure 2 , the voltage adjustment unit 13 of the present application includes a field weakening control unit 131 and a voltage control unit 132. Among them, the field weakening control unit 131 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is used to synthesize the bus voltage and the required voltage by using the first synthesis algorithm to obtain a field weakening control signal. The voltage control unit 132 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is used to synthesize the bus voltage and the required voltage by using the second synthesis algorithm to obtain an initial compensation voltage, and obtain a bus reference voltage based on the initial compensation voltage.

[0044] In a specific embodiment, combine Figure 3 , Figure 3 is Figure 2 a schematic structural diagram of an embodiment of the field weakening control unit in

[0045] Specifically, when the operating mode of the system changes, such as when the frequency increases and / or the load increases, and at this time the operating state of the compressor cannot meet the current operating mode and the frequency cannot reach the set frequency, then the second voltage input unit 12 generates a required voltage Uac greater than the bus voltage Udc based on the current operating mode. Since the required voltage Uac is greater than the bus voltage Udc, the calculated first differential voltage is negative. After the proportional-integral control unit 135 processes the first differential voltage, and after the first limiting unit 136 limits the output of the proportional-integral control unit 135, a field weakening control signal UId is output.

[0046] Further, referring to Figure 4 , Figure 4 is Figure 2 a schematic structural diagram of an embodiment of the intermediate voltage control unit. The voltage control unit 132 specifically includes: a second calculation unit 137, a third calculation unit 138, a reference voltage input unit 139, and a compensation unit 140. Among them, the second calculation unit 137 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is used to synthesize the bus voltage Udc and the required voltage Uac by using a second synthesis algorithm, so as to obtain an initial compensation voltage Ucc. The third calculation unit 138 is connected to the second calculation unit 137 and the reference voltage input unit 139, and is used to obtain a bus reference voltage Udc_ref based on the initial compensation voltage Ucc and the reference voltage Uec provided by the reference voltage input unit 139; the compensation unit 140 is connected to the third calculation unit 138 and the first voltage input unit 11, and is used to adjust the bus voltage Udc based on the bus reference voltage Udc_ref.

[0047] Further, in combination with Figure 5 , the second calculation unit 137 includes: a first coefficient adjustment unit 21, a difference calculation unit 22, an algorithm processing unit 23, and a second limiting unit 24.

[0048] Among them, the first coefficient adjustment unit 21 is connected to the first voltage input unit 11 and is used to adjust the bus voltage Udc by using a first coefficient. Specifically, the first coefficient is a coefficient greater than 0 and less than 1, and specifically, for example, it can be (0.7, 1). In this embodiment, by setting the first coefficient, since the first coefficient is a coefficient greater than 0 and less than 1, the voltage control unit acts ahead of the field weakening control unit, outputs the initial compensation voltage Ucc, and then adjusts the bus voltage to an appropriate voltage.

[0049] The difference calculation unit 22 is connected to the first coefficient adjustment unit 21 and the second voltage input unit 12, and is used to calculate the second differential voltage between the required voltage Uac and the bus voltage adjusted by the first coefficient (for example, K1*Udc, where K1 represents the first coefficient); specifically, the second differential voltage = required voltage Uac - (K1*Udc).

[0050] The algorithm processing unit 23 is connected to the difference calculation unit 22 and is used for integrating the second difference voltage; the second limiting unit 24 is connected to the algorithm processing unit 23 and is used for processing the output of the algorithm processing unit 23 to obtain the initial compensation voltage Ucc. In this embodiment, the ranges of the initial compensation voltage Ucc controlled and output by the algorithm processing unit 23 and the second limiting unit 24 are set. Specifically, the range of the initial compensation voltage Ucc can be, for example, (0 - 100V), ensuring that the voltage change range can adapt to different working modes. The relatively wide change range of the initial compensation voltage Ucc enables this control scheme to adapt to different voltage regulation requirements, ensuring that the system can still maintain a stable output under different load conditions, thereby enhancing the flexibility and stability of the system.

[0051] In one embodiment, the algorithm processing unit 23 includes one of an integral control unit, a proportional-integral control unit, and a proportional-integral-derivative control unit. Specifically, in some simple control scenarios, the algorithm processing unit 23 can be set as an integral control unit; in some scenarios with higher control requirements, the algorithm processing unit 23 can be set as a proportional-integral control unit to improve the response speed and regulation accuracy. If very high control accuracy and response speed are required, the algorithm processing unit 23 can be set as a proportional-integral-derivative control unit. The specific setting of the algorithm processing unit 23 depends on the specific requirements of the system, such as response speed, stability, complexity, etc., and is not specifically limited.

[0052] Furthermore, the reference voltage input unit 139 includes: a reference voltage source 27, an effective value calculation unit 28, a second coefficient adjustment unit 29, and a second addition calculation unit 30. Among them, the reference voltage source 27 is used to provide an AC voltage. The effective value calculation unit 28 is connected to the reference voltage source 27 and is used for processing the AC voltage to obtain an initial reference voltage. The second coefficient adjustment unit 29 is connected to the effective value calculation unit 28 and is used for adjusting the initial reference voltage using a second coefficient, and the second coefficient is, for example, . The second addition calculation unit 30 is connected to the second coefficient adjustment unit 29 and receives a preset voltage Vadj, and is used for calculating the sum of the initial reference voltage and the preset voltage Vadj to obtain the reference voltage Uec. It should be noted that the preset voltage Vadj is an adjustment parameter greater than 0, and its range can be set to, for example, 0 - 30V. Setting the preset voltage can ensure that the PFC (Power Factor Correction) unit is always in the BOOST boost mode (the PFC system is a very important part of power electronics, and maintaining the boost mode can ensure that the input voltage can still be increased to the required bus voltage when the input voltage is insufficient), especially in the case of large load changes, which helps to keep the system operating in an ideal state.

[0053] Further, the third calculation unit 138 includes a first addition calculation unit 26 and a third clipping unit 25. Among them, the first addition calculation unit 26 is connected to the reference voltage input unit 139 and the second calculation unit 137, specifically connected to the second addition calculation unit 30 in the reference voltage input unit 139 and the second clipping unit 24 in the second calculation unit 137, and is used to calculate the sum of the reference voltage Uec and the initial compensation voltage Ucc. The third clipping unit 25 is connected to the first addition calculation unit 26 and is used to process the output of the first addition calculation unit 26 to obtain the bus reference voltage Udc_ref.

[0054] The compensation unit 140 can be, for example, a PFC control unit, which can control the bus voltage Udc based on the bus reference voltage Udc_ref in combination with an internal algorithm. Specifically, based on the voltage adjustment circuit of the present application, the bus reference voltage Udc_ref = Vin_rms * + Vadj + Ucc, where Vin represents the AC voltage and Vin_rms is the initial reference voltage.

[0055] Specifically, when the working mode of the system changes, for example, when the compressor frequency increases and the load increases, in order to avoid entering the field-weakening state and causing an increase in energy consumption, it is necessary to increase the bus voltage. The first coefficient adjustment unit 21 adjusts the bus voltage using the first coefficient. The difference calculation unit 22 calculates the second difference voltage = the required voltage Uac - (K1 * Udc). Since the required voltage Uac is greater than the bus voltage Udc and the bus voltage Udc has been processed by the first coefficient, the second difference voltage is positive at this time. After being processed by the algorithm processing unit 23 and the second clipping unit 24, the initial compensation voltage Ucc is output. The first addition calculation unit 26 adds the initial compensation voltage Ucc and the reference voltage Uec, and after clipping processing, the bus reference voltage Udc_ref is obtained, and the bus voltage Udc is controlled using this bus reference voltage Udc_ref.

[0056] It is worth noting that during this process, the field-weakening control and the voltage control share the input parameters (the bus voltage Udc and the required voltage Uac), avoiding repeated calculations. This design optimizes the operation efficiency of the system and reduces the hardware's demand for computing resources. Especially in complex power electronic systems, this optimization will significantly improve the system response speed and stability.

[0057] The voltage adjustment circuit of the present application can significantly improve the overall operating efficiency of the air-conditioning system without affecting the control performance of the compressor motor. By real-time monitoring and adaptively adjusting the bus voltage, the compressor motor can operate at the optimal voltage, which can improve the overall operating efficiency of the air-conditioning system and reduce energy consumption. This method has a simple structure and can share input parameters for field-weakening control and voltage control, effectively reducing the computational amount. The design of the adaptive adjustment of the bus voltage adopts a simple and efficient mathematical model. Combining with the field-weakening control, the optimal bus voltage adjustment value is calculated. This method avoids complex algorithm calculations and frequent experimental debugging. The simplified calculation process not only improves the real-time response speed but also reduces the burden on the processor and the hardware requirements, making the system more stable and reliable. The voltage adjustment circuit of the present application has strong versatility and can adapt to various types of compressors and drive systems. In practical applications, the working environment and power supply voltage of the compressor may change. By adopting the adaptive adjustment method, it is not necessary to individually debug each device, but the voltage optimization is achieved through a general algorithm. This greatly improves the applicable scope of the technology, especially suitable for air-conditioning systems or other compressor drive systems that need to be widely promoted, thus saving a large amount of time and resources.

[0058] In an embodiment of the present application, in response to the first working mode, the second voltage input unit 12 provides a first required voltage Uac1. The voltage adjustment unit 13 synthesizes the bus voltage Udc and the first required voltage Uac1 by using a first synthesis algorithm to obtain a field-weakening control signal; and synthesizes the bus voltage Udc and the first required voltage Uac1 by using a second synthesis algorithm to obtain a first initial compensation voltage Ucc1, and obtains a first bus reference voltage Udc_ref1 based on the first initial compensation voltage Ucc1. It should be noted that when the system frequency is in an increasing state and the load increases, it is in the first working mode.

[0059] Specifically, when the system frequency is in an increasing state and the load increases, it is in the first working mode; at this time, the bus voltage Udc is not sufficient to support the motor to operate at a speed matching the system frequency and load, so it is necessary to increase the bus voltage Udc. At this time, a first required voltage Uac1 is generated based on the system frequency and load, and the first required voltage Uac1 is greater than the bus voltage Udc. The specific process is as described above and will not be elaborated here. The voltage control unit 132 obtains a first initial compensation voltage Ucc1 based on the bus voltage Udc and the first required voltage Uac1. At this time, the first initial compensation voltage Ucc1 is in a continuously increasing state, and the corresponding first bus reference voltage Udc_ref1 is used to adjust the bus voltage Udc, so that the bus voltage Udc is in a continuously rising state until the system is stable.

[0060] In an embodiment of the present application, in response to the second operating mode, the second voltage input unit 12 provides a second required voltage Uac2. The voltage adjustment unit 13 synthesizes the bus voltage Udc and the second required voltage Uac2 using a first synthesis algorithm to obtain a field-weakening control signal; and synthesizes the bus voltage Udc and the second required voltage Uac2 using a second synthesis algorithm to obtain a second initial compensation voltage Ucc2, and obtains a second bus reference voltage Udc_ref2 based on the second initial compensation voltage Ucc2.

[0061] Specifically, when the system frequency is in a decreasing state and the load is decreasing, it is in the second operating mode. At this time, the bus voltage Udc is too large, which will cause greater power consumption. Therefore, it is necessary to reduce the bus voltage Udc. At this time, a second required voltage Uac2 is generated based on the system frequency and the load, and the second required voltage Uac2 is less than the bus voltage Udc. The field-weakening control unit 131 outputs a field-weakening control signal UId = 0, and the system operates in a non-field-weakening state. The specific process is as described above and will not be elaborated here. The voltage control unit 132 obtains a second initial compensation voltage Ucc2 based on the bus voltage Udc and the second required voltage Uac2. At this time, the second initial compensation voltage Ucc2 is in a continuously decreasing state. The bus voltage Udc is adjusted using the corresponding second bus reference voltage Udc_ref2, so that the bus voltage Udc is in a continuously decreasing state until the system is stable.

[0062] In one embodiment, the first initial compensation voltage Ucc1 is greater than the second initial compensation voltage Ucc2.

[0063] The voltage adjustment circuit of the present application, combined with the control logic of the field-weakening loop, can adjust the bus voltage in a timely manner, avoid entering the field-weakening state, and improve the efficiency and stability of the compressor. This method not only effectively avoids the problem of voltage shortage, but also can obtain the minimum required bus voltage, reduce losses, and improve the energy efficiency of the air-conditioning system.

[0064] See Figure 6 , Figure 6 which is a schematic flow chart of an embodiment of the voltage adjustment method of the present application, specifically including: Step S61: Obtain the bus voltage and obtain the required voltage according to the operating mode of the system.

[0065] This application dynamically adjusts the bus voltage according to the working mode of the system. Finding the minimum bus voltage for driving the system to work is the key. Therefore, this application provides a required voltage according to the working mode of the system. Subsequently, a bus reference voltage is obtained based on the bus voltage and the required voltage, and the bus voltage is adjusted by using the bus reference voltage, so that the adjusted bus voltage can be ensured to be the minimum voltage matching the working mode of the system, which can reduce the switching losses in the inverter and the PFC converter, improve the overall operating efficiency of the machine, and reduce energy consumption. During this process, a field-weakening control signal is also output based on the bus voltage and the required voltage to ensure the stability and controllability of the dynamic adjustment of the bus voltage.

[0066] In one embodiment of this application, in response to the first working mode, the first required voltage is obtained. And in response to the second working mode, the second required voltage is obtained.

[0067] Step S62: Generate a field-weakening control signal based on the bus voltage and the required voltage.

[0068] In one embodiment, the bus voltage and the required voltage are synthesized through a first synthesis algorithm to generate a field-weakening control signal. Among them, the first synthesis algorithm includes: calculating the first difference voltage between the bus voltage and the required voltage, and generating a field-weakening control signal after proportional-integral processing and amplitude limiting of the first difference voltage. Specifically, the first difference voltage = bus voltage - required voltage.

[0069] Specifically, if the system works in the first working mode, then at this time, a field-weakening control signal is obtained based on the bus voltage and the first required voltage. Specifically, the bus voltage and the first required voltage are synthesized by using the first synthesis algorithm to generate a field-weakening control signal. In this embodiment, the first synthesis algorithm includes calculating the first difference voltage between the bus voltage and the first required voltage, and generating a field-weakening control signal after proportional-integral processing and amplitude limiting of the first difference voltage. Specifically, the first difference voltage = bus voltage - first required voltage.

[0070] If the system works in the second working mode, then at this time, a field-weakening control signal is obtained based on the bus voltage and the second required voltage. Specifically, the bus voltage and the second required voltage are synthesized by using the first synthesis algorithm to generate a field-weakening control signal. In this embodiment, the first synthesis algorithm includes calculating the first difference voltage between the bus voltage and the second required voltage, and generating a field-weakening control signal after proportional-integral processing and amplitude limiting of the first difference voltage. Specifically, the first difference voltage = bus voltage - second required voltage.

[0071] Step S63: Generate a bus reference voltage based on the bus voltage and the required voltage, and use the bus reference voltage to adjust the bus voltage.

[0072] It should be noted that if the system operates in the first operating mode, the first bus reference voltage is obtained based on the bus voltage and the first required voltage at this time. If the system operates in the second operating mode, the second bus reference voltage is obtained based on the bus voltage and the second required voltage at this time. Among them, the first bus reference voltage is determined by the first initial compensation voltage, the second bus reference voltage is determined by the second initial compensation voltage, and the first initial compensation voltage is greater than the second initial compensation voltage.

[0073] In one embodiment, the bus voltage and the required voltage are synthesized through a second synthesis algorithm to generate an initial compensation voltage, and the bus reference voltage is obtained based on the initial compensation voltage. Among them, the second synthesis algorithm includes: multiplying the bus voltage by a first coefficient and then calculating the second difference voltage with the required voltage, and performing integral and limiting processing on the second difference voltage to generate the initial compensation voltage. Specifically, the second difference voltage = required voltage - (K1 * bus voltage), where K1 represents the first coefficient. Since the first coefficient is a coefficient greater than 0 and less than 1, the voltage control unit acts earlier than the field weakening control unit, outputs the initial compensation voltage Ucc, and then adjusts the bus voltage to an appropriate voltage.

[0074] It can be understood that if the system operates in the first operating mode at this time, the bus voltage and the first required voltage are synthesized through the second synthesis algorithm to generate the first initial compensation voltage, and the first bus reference voltage is obtained based on the first initial compensation voltage. Among them, the second synthesis algorithm includes: multiplying the bus voltage by a first coefficient and then calculating the second difference voltage with the first required voltage, and performing integral and limiting processing on the second difference voltage to generate the first initial compensation voltage.

[0075] If the system operates in the second operating mode at this time, the bus voltage and the second required voltage are synthesized through the second synthesis algorithm to generate the second initial compensation voltage, and the second bus reference voltage is obtained based on the second initial compensation voltage. Among them, the second synthesis algorithm includes: multiplying the bus voltage by a first coefficient and then calculating the second difference voltage with the second required voltage, and performing integral and limiting processing on the second difference voltage to generate the second initial compensation voltage.

[0076] Furthermore, obtain the reference voltage; among them, the steps of obtaining the reference voltage include: collecting the AC voltage and calculating its effective value to obtain the initial reference voltage; multiplying the initial reference voltage by a second coefficient and then adding a preset voltage to generate the reference voltage. Among them, the second coefficient is, for example, , the preset voltage is an adjustment parameter greater than 0, and its range can be set to 0 - 30V, for example. Superimposing the preset voltage can ensure that the PFC (Power Factor Correction) unit is always in the BOOST boost mode (the PFC system is a very important part of power electronics. Maintaining the boost mode can ensure that the input voltage can still be increased to the required bus voltage when the input voltage is insufficient), especially in the case of large load changes, which helps to keep the system running in an ideal state. Add the initial compensation voltage and the reference voltage, and perform a clipping process on the added result to generate the bus reference voltage. Specifically, calculate the sum of the reference voltage and the initial compensation voltage, and perform a clipping process on the added result to obtain the bus reference voltage.

[0077] It can be understood that if in the first working mode, then add the first initial compensation voltage and the reference voltage, and perform a clipping process on the added result to generate the first bus reference voltage. If in the second working mode, then add the second initial compensation voltage and the reference voltage, and perform a clipping process on the added result to generate the second bus reference voltage.

[0078] In an embodiment of the present application, in response to the system frequency being in an ascending state and the load increasing, it is determined that the system is in the first working mode; in response to the system frequency being in a descending state and the load decreasing, it is determined that the system is in the second working mode. It can be understood that when the system frequency is in an ascending state and the load increases, the bus voltage is insufficient to drive the working parameters of the electrode, such as rotational speed and frequency, etc., to maintain the current working mode. At this time, it is necessary to increase the bus voltage. Specifically, obtain the first required voltage, and then make the first initial compensation voltage continuously increase to obtain the first bus reference voltage to adjust the bus voltage until the bus voltage is stable. And when the system frequency is in a descending state and the load decreases, the bus voltage is too high, which will cause relatively large energy consumption. At this time, it is necessary to reduce the bus voltage. Specifically, obtain the second required voltage, and then make the second initial compensation voltage continuously decrease to obtain the first bus reference voltage to adjust the bus voltage until the bus voltage is stable.

[0079] See Figure 7 , Figure 7 is a schematic structural diagram of an embodiment of the electronic device of the present application. The electronic device 70 includes the voltage adjustment circuit 71 of any of the above embodiments. The electronic device of the present application can be, for example, a variable-frequency air conditioner, a variable-frequency refrigerator, etc.

[0080] The above are only the embodiments of the present invention, and do not limit the patent protection scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A voltage regulation circuit, characterized in that, Comprising: A first voltage input unit for providing a bus voltage; A second voltage input unit for providing a required voltage according to the operating mode of the system; A voltage adjustment unit connected to the first voltage input unit and the second voltage input unit for outputting a field-weakening control signal based on the bus voltage and the required voltage, and the voltage adjustment unit is further configured to generate a bus reference voltage based on the bus voltage and the required voltage, and use the bus reference voltage to adjust the bus voltage.

2. The voltage adjustment circuit according to claim 1, wherein The voltage adjustment unit is configured to synthesize the bus voltage and the required voltage by using a first synthesis algorithm to obtain the field-weakening control signal; and synthesize the bus voltage and the required voltage by using a second synthesis algorithm to obtain an initial compensation voltage, and obtain the bus reference voltage based on the initial compensation voltage.

3. The voltage adjustment circuit according to claim 2, wherein The voltage adjustment unit includes: A field-weakening control unit connected to the first voltage input unit and the second voltage input unit for synthesizing the bus voltage and the required voltage by using a first synthesis algorithm; A voltage control unit connected to the first voltage input unit and the second voltage input unit for synthesizing the bus voltage and the required voltage by using a second synthesis algorithm to obtain the initial compensation voltage, and obtaining the bus reference voltage based on the initial compensation voltage.

4. The voltage regulation circuit according to claim 3, wherein The field-weakening control unit includes: A first calculation unit connected to the first voltage input unit and the second voltage input unit for calculating a first difference voltage between the bus voltage and the required voltage; A control unit connected to the first calculation unit for processing the first difference voltage to obtain the field-weakening control signal.

5. The voltage adjustment circuit according to claim 4, wherein The control unit includes: a proportional-integral control unit and a first limiting unit, the proportional-integral control unit is connected to the first calculation unit, and the first limiting unit is connected to the proportional-integral control unit.

6. The voltage adjustment circuit according to claim 3, wherein The voltage control unit includes: A second calculation unit connected to the first voltage input unit and the second voltage input unit for synthesizing the bus voltage and the required voltage by using a second synthesis algorithm to obtain the initial compensation voltage; A third calculation unit and a reference voltage input unit, the third calculation unit is connected to the second calculation unit and the reference voltage input unit for obtaining the bus reference voltage based on the initial compensation voltage and the reference voltage provided by the reference voltage input unit; A compensation unit connected to the third calculation unit and the first voltage input unit for adjusting the bus voltage based on the bus reference voltage.

7. The voltage adjustment circuit according to claim 6, characterized in that, The second calculation unit includes: A first coefficient adjustment unit connected to the first voltage input unit for adjusting the bus voltage by using a first coefficient; A difference calculation unit connected to the first coefficient adjustment unit and the second voltage input unit for calculating a second difference voltage between the required voltage and the bus voltage adjusted by the first coefficient; An algorithm processing unit, connected to the difference calculation unit, is configured to perform integral processing on the second difference voltage; the algorithm processing unit includes one of an integral control unit, a proportional-integral control unit, and a proportional-integral-derivative control unit; A second limiting unit, connected to the algorithm processing unit, is configured to process the output of the algorithm processing unit to obtain the initial compensation voltage.

8. The voltage adjustment circuit according to claim 6, characterized in that, The third calculation unit includes: A first addition calculation unit, connected to the reference voltage input unit and the second calculation unit, is configured to calculate the sum of the reference voltage and the initial compensation voltage; A third limiting unit, connected to the first addition calculation unit, is configured to process the output of the first addition calculation unit to obtain the bus reference voltage.

9. The voltage adjustment circuit according to claim 6, wherein The reference voltage input unit includes: A reference voltage source, configured to provide an AC voltage; An effective value calculation unit, connected to the reference voltage source, is configured to process the AC voltage to obtain an initial reference voltage; A second coefficient adjustment unit, connected to the effective value calculation unit, is configured to adjust the initial reference voltage using a second coefficient; A second addition calculation unit, connected to the second coefficient adjustment unit and receiving a preset voltage, is configured to calculate the sum of the initial reference voltage and the preset voltage to obtain the reference voltage.

10. The voltage adjustment circuit according to any one of claims 1 to 9, characterized in that, In response to the first operating mode, the second voltage input unit provides a first demand voltage, and the voltage adjustment unit synthesizes the bus voltage and the first demand voltage using a first synthesis algorithm to obtain the field weakening control signal; and synthesizes the bus voltage and the first demand voltage using a second synthesis algorithm to obtain a first initial compensation voltage, and obtains a first bus reference voltage based on the first initial compensation voltage; In response to the second operating mode, the second voltage input unit provides a second demand voltage, and the voltage adjustment unit synthesizes the bus voltage and the second demand voltage using a first synthesis algorithm to obtain the field weakening control signal; and synthesizes the bus voltage and the second demand voltage using a second synthesis algorithm to obtain a second initial compensation voltage, and obtains a second bus reference voltage based on the second initial compensation voltage; Wherein, the first initial compensation voltage is greater than the second initial compensation voltage.

11. The voltage adjustment circuit according to claim 10, characterized in that, In response to the system frequency being in an increasing state and the load increasing, it is in the first operating mode; In response to the system frequency being in a decreasing state and the load decreasing, it is in the second operating mode.

12. A voltage regulation method, characterized in that, It includes: Obtain the bus voltage and obtain the demand voltage according to the operating mode of the system; Generate a field weakening control signal based on the bus voltage and the demand voltage; Generate a bus reference voltage based on the bus voltage and the demand voltage, and use the bus reference voltage to adjust the bus voltage.

13. The voltage adjustment method according to claim 12, wherein The step of generating a field weakening control signal based on the bus voltage and the demand voltage includes: synthesizing the bus voltage and the demand voltage through a first synthesis algorithm to generate the field weakening control signal; The step of generating a bus reference voltage based on the bus voltage and the required voltage includes: synthesizing the bus voltage and the required voltage through a second synthesis algorithm to generate an initial compensation voltage, and obtaining the bus reference voltage based on the initial compensation voltage.

14. The voltage adjustment method according to claim 13, wherein: The first synthesis algorithm includes: calculating a first difference voltage between the bus voltage and the required voltage, and generating the field weakening control signal after performing proportional-integral processing and limiting on the first difference voltage; The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient and then calculating a second difference voltage from the required voltage, and generating the initial compensation voltage after performing integral and limiting processing on the second difference voltage.

15. The voltage adjustment method according to claim 13, wherein The step of obtaining the bus reference voltage based on the initial compensation voltage includes: Obtaining a reference voltage; Adding the initial compensation voltage to the reference voltage, and performing limiting processing on the added result to generate the bus reference voltage.

16. The voltage adjustment method according to claim 15, wherein The step of obtaining a reference voltage includes: Collecting an AC voltage and calculating its effective value to obtain an initial reference voltage; Multiplying the initial reference voltage by a second coefficient and then superimposing a preset voltage to generate the reference voltage.

17. The voltage adjustment method according to any one of claims 12-16, characterized in that, The step of obtaining the required voltage according to the working mode of the system includes: Responding to a first working mode to obtain a first required voltage; The step of generating a field weakening control signal based on the bus voltage and the required voltage includes: obtaining the field weakening control signal based on the bus voltage and the first required voltage; The step of generating a bus reference voltage based on the bus voltage and the required voltage includes: obtaining a first bus reference voltage based on the bus voltage and the first required voltage.

18. The voltage adjustment method according to claim 17, characterized in that, The step of obtaining the required voltage according to the working mode of the system includes: Responding to a second working mode to obtain a second required voltage; The step of generating a field weakening control signal based on the bus voltage and the required voltage includes: obtaining the field weakening control signal based on the bus voltage and the second required voltage; The step of generating a bus reference voltage based on the bus voltage and the required voltage includes: obtaining a second bus reference voltage based on the bus voltage and the second required voltage; Wherein, the first bus reference voltage is determined by a first initial compensation voltage, the second bus reference voltage is determined by a second initial compensation voltage, and the first initial compensation voltage is greater than the second initial compensation voltage.

19. The voltage adjustment method according to claim 18, wherein Responding to the system frequency being in an ascending state and the load increasing, it is determined that the system is in the first working mode; Responding to the system frequency being in a descending state and the load decreasing, it is determined that the system is in the second working mode.

20. An electronic device, characterized in that, Including the voltage adjustment circuit according to any one of claims 1 to 11 above.

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