Voltage regulation circuit, method and electronic device

Abstract

The present invention provides a voltage adjustment circuit, method, and electronic device. The voltage adjustment circuit provided by the present invention is provided with a first voltage input unit and a second voltage input unit, wherein the first voltage input unit is used to provide a bus voltage; the second voltage input unit is used to provide a required voltage according to the working mode of the system; a voltage adjustment unit is connected to the first voltage input unit and the second voltage input unit, and is used to output a weak magnetic 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 to adjust the bus voltage using the bus reference voltage. The voltage adjustment circuit of the present application can adaptively and dynamically adjust the bus voltage according to the working mode of the system, thereby improving the operating efficiency of the entire machine and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of variable frequency air-conditioning motor control, and in particular to a voltage regulation circuit, method and electronic equipment. Background Art

[0002] BOOST (Boost Converter) Power Factor Correcting (PFC) converters are widely used in variable frequency air conditioner outdoor units to provide a stable and reliable DC voltage to the compressor drive of the subsequent inverter circuit.

[0003] The frequency range of air-conditioning compressors is usually 10Hz-120Hz, which is a wide range. The existing method uses a fixed higher bus voltage method, which will reduce the overall efficiency of the compressor in the low-frequency area and increase the overall energy consumption. Summary of the Invention

[0004] The present invention mainly provides a voltage regulation circuit, method and electronic equipment, which 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.

[0005] To solve the above technical problems, the first technical solution adopted by the present invention is to provide a voltage regulating circuit, comprising:

[0006] A first voltage input unit, used for providing bus voltage;

[0007] A second voltage input unit, configured to provide a required voltage according to a working mode of the system;

[0008] The voltage adjustment unit is connected to the first voltage input unit and the second voltage input unit, and is used to output a weak magnetic 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 adjust the bus voltage using the bus reference voltage.

[0009] In one embodiment, the voltage adjustment unit is used to synthesize the bus voltage and the demand voltage using a first synthesis algorithm to obtain a weak magnetic control signal; and to synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain an initial compensation voltage, and to obtain a bus reference voltage based on the initial compensation voltage.

[0010] In one embodiment, the voltage adjustment unit includes:

[0011] a magnetic weakening control unit connected to the first voltage input unit and the second voltage input unit, and configured to synthesize the bus voltage and the demand voltage using a first synthesis algorithm;

[0012] The voltage control unit is connected to the first voltage input unit and the second voltage input unit, and is used to synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain an initial compensation voltage, and obtain a bus reference voltage based on the initial compensation voltage.

[0013] In one embodiment, the magnetic field weakening control unit includes:

[0014] 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;

[0015] The control unit is connected to the first calculation unit and is used to process the first difference voltage to obtain a magnetic field weakening control signal.

[0016] In one embodiment, the control unit includes: a proportional-integral control unit and a first limiter unit, the proportional-integral control unit is connected to the first calculation unit, and the first limiter unit is connected to the proportional-integral control unit.

[0017] In one embodiment, the voltage control unit includes:

[0018] a second calculation unit, connected to the first voltage input unit and the second voltage input unit, for synthesizing the bus voltage and the demand voltage using a second synthesis algorithm to obtain an initial compensation voltage;

[0019] a third calculation unit and a reference voltage input unit, the third calculation unit being connected to the second calculation unit and the reference voltage input unit and being configured to obtain a bus reference voltage based on the initial compensation voltage and a reference voltage provided by the reference voltage input unit;

[0020] The compensation unit is connected to the third calculation unit and the first voltage input unit, and is used to adjust the bus voltage based on the bus reference voltage.

[0021] In one embodiment, the second computing unit includes:

[0022] A first coefficient adjustment unit, connected to the first voltage input unit, for adjusting the bus voltage using a first coefficient;

[0023] a difference calculation unit connected to the first coefficient adjustment unit and the second voltage input unit, and configured to calculate a second difference voltage between the demand voltage and the bus voltage after the first coefficient adjustment;

[0024] an algorithm processing unit connected to the difference calculation unit and configured to perform integration 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-differential control unit;

[0025] The second amplitude limiting unit is connected to the algorithm processing unit and is used to process the output of the algorithm processing unit to obtain an initial compensation voltage.

[0026] In one embodiment, the third computing unit includes:

[0027] A first adding 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;

[0028] The third limiting unit is connected to the first adding unit and is used for processing the output of the first adding unit to obtain a bus reference voltage.

[0029] In one embodiment, the reference voltage input unit includes:

[0030] A reference voltage source for providing an AC voltage;

[0031] An effective value calculation unit, connected to a reference voltage source, for processing the AC voltage to obtain an initial reference voltage;

[0032] A second coefficient adjustment unit, connected to the effective value calculation unit, is used to adjust the initial reference voltage using the second coefficient;

[0033] The second addition calculation unit is connected to the second coefficient adjustment unit and receives the preset voltage, and is used to calculate the sum of the initial reference voltage and the preset voltage to obtain the reference voltage.

[0034] In one embodiment, in response to the first operating mode, the second voltage input unit provides a first required voltage, the voltage adjustment unit synthesizes the bus voltage and the first required voltage using a first synthesis algorithm to obtain a magnetic field weakening control signal, and synthesizes the bus voltage and the first required 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.

[0035] In response to the second operating mode, the second voltage input unit provides a second required voltage, the voltage adjustment unit synthesizes the bus voltage and the second required voltage using a first synthesis algorithm to obtain a magnetic field weakening control signal, and synthesizes the bus voltage and the second required 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.

[0036] The first initial compensation voltage is greater than the second initial compensation voltage.

[0037] In one embodiment, in response to the system frequency being in an increasing state and the load increasing, the system is in the first operating mode;

[0038] In response to the system frequency being in a decreasing state and the load being reduced, the system is in the second working mode.

[0039] To solve the above technical problems, the second technical solution adopted by the present invention is to provide a voltage adjustment method, comprising:

[0040] Obtain bus voltage and obtain required voltage according to the system working mode;

[0041] Generate a field weakening control signal based on the bus voltage and the demand voltage;

[0042] A bus reference voltage is generated based on the bus voltage and the demand voltage, and the bus voltage is adjusted using the bus reference voltage.

[0043] In one embodiment, the step of generating a magnetic field weakening control signal based on the bus voltage and the demand voltage includes: synthesizing the bus voltage and the demand voltage using a first synthesis algorithm to generate the magnetic field weakening control signal;

[0044] The step of generating a bus reference voltage based on the bus voltage and the demand voltage includes: synthesizing the bus voltage and the demand voltage through a second synthesis algorithm to generate an initial compensation voltage, and obtaining the bus reference voltage based on the initial compensation voltage.

[0045] In one embodiment, the first synthesis algorithm includes: calculating a first difference voltage between the bus voltage and the demand voltage, performing proportional-integral processing on the first difference voltage and limiting the amplitude to generate a field weakening control signal;

[0046] The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient to calculate a second difference voltage between the bus voltage and the required voltage, integrating and limiting the second difference voltage to generate an initial compensation voltage.

[0047] In one embodiment, the step of obtaining the bus reference voltage based on the initial compensation voltage includes:

[0048] Get the reference voltage;

[0049] The initial compensation voltage is added to the reference voltage, and the addition result is limited to generate a bus reference voltage.

[0050] In one embodiment, the step of obtaining a reference voltage includes:

[0051] Collect the AC voltage and calculate its effective value to obtain the initial reference voltage;

[0052] The initial reference voltage is multiplied by the second coefficient and then superimposed with the preset voltage to generate a reference voltage.

[0053] In one embodiment, the step of obtaining the required voltage according to the operating mode of the system includes:

[0054] In response to the first operating mode, obtaining a first required voltage;

[0055] The step of generating a flux weakening control signal based on the bus voltage and the demand voltage includes: obtaining the flux weakening control signal based on the bus voltage and the first demand voltage;

[0056] The step of generating a bus reference voltage based on the bus voltage and the demand voltage includes: obtaining a first bus reference voltage based on the bus voltage and the first demand voltage.

[0057] In one embodiment, the step of obtaining the required voltage according to the operating mode of the system includes:

[0058] In response to the second operating mode, obtaining a second required voltage;

[0059] The step of generating a flux weakening control signal based on the bus voltage and the demand voltage includes: obtaining the flux weakening control signal based on the bus voltage and the second demand voltage;

[0060] The step of generating a bus reference voltage based on the bus voltage and the demand voltage includes: obtaining a second bus reference voltage based on the bus voltage and the second demand voltage;

[0061] 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.

[0062] In one embodiment, in response to the system frequency being in an increasing state and the load increasing, determining that the system is in the first operating mode;

[0063] In response to the system frequency being in a decreasing state and the load being reduced, it is determined that the system is in the second operating mode.

[0064] In order to solve the above technical problems, the third technical solution adopted by the present invention is: to provide an electronic device, comprising any one of the voltage regulating circuits described above.

[0065] 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, wherein 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 weak magnetic 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 to adjust the bus voltage using the bus reference 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, thereby improving the operating efficiency of the entire machine and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0067] Figure 1 This is a schematic structural diagram of a first embodiment of the voltage regulation circuit of the present application;

[0068] Figure 2 This is a schematic structural diagram of a second embodiment of the voltage regulation circuit of the present application;

[0069] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a medium-weak magnetic control unit;

[0070] Figure 4 for Figure 2 A schematic structural diagram of a first embodiment of a medium voltage control unit;

[0071] Figure 5 for Figure 2 A schematic structural diagram of a second embodiment of a medium voltage control unit;

[0072] Figure 6 This is a flow chart of an embodiment of the voltage adjustment method of the present application;

[0073] Figure 7 This is a schematic structural diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0074] The following describes the embodiments of the present application in detail with reference to the accompanying drawings.

[0075] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0076] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship. Furthermore, "many" in this document means two or more than two.

[0077] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0078] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0079] By analyzing the efficiency characteristics of inverters and PFC at different bus voltages, it is found that lower bus voltage amplitudes generally reduce inverter switching losses. Lower bus voltages reduce voltage stress during switching, thereby reducing switching losses and improving efficiency. In PFC converters, lower bus voltages also help reduce switching losses. The primary task of PFC is to convert the input AC voltage into a stable DC bus voltage. A lower bus voltage results in less voltage conversion, which reduces switching losses.

[0080] Generally, if the system load and / or frequency increases, the system will enter a field-weakening state to ensure the motor can provide the corresponding speed. (Field-weakening refers to reducing the main pole magnetic flux by reducing the excitation current, thereby increasing the motor speed without increasing the armature voltage.) This application provides an adaptive bus voltage adjustment strategy that dynamically adjusts the bus voltage to reduce switching losses in the inverter and PFC converter, improving overall energy efficiency. However, this optimization must be handled with care to ensure that it does not affect the compressor motor control performance, especially to avoid entering a field-weakening state. (The purpose of bus voltage adjustment is to match the system operating mode, such as load size or frequency.) In compressor motor control, the bus voltage cannot be too low, otherwise the motor control system may not obtain sufficient voltage for precise regulation, resulting in reduced efficiency or stability issues. Therefore, it is necessary to find a minimum bus voltage that can achieve drive, which maximizes the efficiency of the inverter and PFC converter while avoiding a decrease in compressor motor control performance.

[0081] In view of this, the present application provides a voltage regulation circuit, which includes: a first voltage input unit, a second voltage input unit, and a voltage regulation unit. The first voltage input unit is used to provide a bus voltage; the second voltage input unit is used to provide a required voltage according to the system's operating mode; the voltage regulation unit is connected to the first voltage input unit and the second voltage input unit, and is used to output a weak magnetic field 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 to adjust the bus voltage using the bus reference voltage. An appropriate bus voltage can prevent the control system from entering a weak magnetic field state. The circuit can dynamically adjust the bus voltage according to the system's operating mode, improve the overall operating efficiency, and reduce energy consumption.

[0082] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0083] See also Figure 1 , Figure 1 This is a structural diagram of the first embodiment of the voltage adjustment circuit of the present application, which specifically includes: 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 weak magnetic 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 adjust the bus voltage using the bus reference voltage. Using the bus reference voltage to adjust the bus voltage can, on the one hand, improve the operating efficiency of the entire machine and reduce energy consumption, and on the other hand, provide an appropriate bus voltage to prevent the system from entering a weak magnetic state.

[0084] It is worth noting that the voltage adjustment unit 13 of the present application includes two ports, one of which is connected to the first voltage input unit 11 and the second voltage input unit 12 for receiving the bus voltage and the demand voltage, and the other port is directly connected to the first voltage input unit 11 for transmitting the bus reference voltage, and using the bus reference voltage to adjust the bus voltage provided by the first voltage input unit 11.

[0085] It should be noted that the voltage regulation circuit of the present application dynamically adjusts the bus voltage based on the system's operating mode. Finding the minimum bus voltage required for the drive system to operate is crucial. Therefore, the present application provides a second voltage input unit 12, which provides a required voltage based on the system's operating mode. Subsequently, a bus reference voltage is obtained based on the bus voltage and the required voltage. The bus voltage is adjusted using the bus reference voltage to ensure that the adjusted bus voltage is the minimum voltage that matches the system's operating mode. This reduces switching losses in the inverter and PFC converter, improves overall operating efficiency, and reduces energy consumption. During this process, a field-weakening control signal is output based on the bus voltage and the required voltage to ensure the stability and controllability of the dynamic bus voltage adjustment.

[0086] In one embodiment of the present application, the first voltage input unit 11 may further set a coefficient 1 / sqrt(3) to adjust the initial bus voltage, thereby providing a bus voltage such that the bus voltage meets the voltage change requirement of the voltage adjustment circuit.

[0087] In another embodiment of the present application, the second voltage input unit 12 can also be configured to provide two sub-demand voltages, namely Uα and U β , respectively for U α and U β Perform square calculation and sum, take the square root of the sum, and finally get the required voltage. It should be noted that in the field of motor control, the analysis method based on the α-β coordinate system is used to calculate the voltage vector amplitude Uα and U β It can be regarded as two components of the voltage vector in the α-β coordinate system. By taking the square root of the sum of the squares, the amplitude of the voltage vector (i.e., the required voltage) can be obtained, thereby achieving precise control of the electrode torque and speed.

[0088] In one embodiment of the present application, the voltage adjustment unit 13 is used to synthesize the bus voltage and the demand voltage using a first synthesis algorithm to obtain a weak magnetic control signal; synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain an initial compensation voltage, and obtain a bus reference voltage based on the initial compensation voltage.

[0089] For details, please combine Figure 2The voltage adjustment unit 13 of the present application includes a magnetic field weakening control unit 131 and a voltage control unit 132. The magnetic field weakening control unit 131 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is configured to synthesize the bus voltage and the required voltage using a first synthesis algorithm to obtain a magnetic 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 configured to synthesize the bus voltage and the required voltage using a second synthesis algorithm to obtain an initial compensation voltage, and to obtain a bus reference voltage based on the initial compensation voltage.

[0090] In a specific embodiment, combining Figure 3 , Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a magnetic field weakening control unit is shown. The magnetic field weakening control unit 131 specifically includes: a first calculation unit 133 and a control unit 134. The first calculation unit 133 is connected to the first voltage input unit 11 to receive the bus voltage Udc, and to the second voltage input unit 12 to receive the demand voltage Uac, and is used to calculate the first difference voltage between the bus voltage Udc and the demand voltage Uac. Specifically, the first difference voltage = bus voltage Udc - demand voltage Uac. The control unit 134 is connected to the first calculation unit 133 and is used to process the first difference voltage to obtain a magnetic field weakening control signal. Furthermore, the control unit 134 also includes a proportional-integral control unit 135 and a first limiter unit 136. The proportional-integral control unit 135 is connected to the first calculation unit 133, and the first limiter unit 136 is connected to the proportional-integral control unit 135.

[0091] Specifically, when the operating mode of the system changes, for example, the frequency increases and / or the load increases, 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 demand voltage Uac greater than the bus voltage Udc based on the current operating mode. Since the demand voltage Uac is greater than the bus voltage Udc, the calculated first difference voltage is a negative value. The first difference voltage is processed by the proportional-integral control unit 135, and the output of the proportional-integral control unit 135 is limited by the first limiting unit 136 to output a weak magnetic control signal UId.

[0092] For further information, see Figure 4 , Figure 4 for Figure 2A schematic diagram of the structure of an embodiment of a medium 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. The second calculation unit 137 is connected to the first voltage input unit 11 and the second voltage input unit 12, and is configured to synthesize the bus voltage Udc and the demand voltage Uac using a second synthesis algorithm 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 configured 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 configured to adjust the bus voltage Udc based on the bus reference voltage Udc_ref.

[0093] Further, combined 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.

[0094] The first coefficient adjustment unit 21 is connected to the first voltage input unit 11 and is configured to adjust the bus voltage Udc using a first coefficient. Specifically, the first coefficient is a coefficient greater than 0 and less than 1, such as (0.7, 1). In this embodiment, the first coefficient is set. Since the first coefficient is greater than 0 and less than 1, the voltage control unit activates the magnetic field weakening control unit in advance, outputting the initial compensation voltage Ucc, thereby adjusting the bus voltage to an appropriate voltage.

[0095] 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 difference voltage between the required voltage Uac and the bus voltage after the first coefficient adjustment (for example, K1*Udc, K1 represents the first coefficient); specifically, the second difference voltage = required voltage Uac - (K1*Udc).

[0096] The algorithm processing unit 23 is connected to the difference calculation unit 22 and is used to integrate the second difference voltage; the second limiter unit 24 is connected to the algorithm processing unit 23 and is used to process the output of the algorithm processing unit 23 to obtain the initial compensation voltage Ucc. In this embodiment, the algorithm processing unit 23 and the second limiter unit 24 are set to control the range of the output initial compensation voltage Ucc. Specifically, the range of the initial compensation voltage Ucc can be, for example, (0-100V), ensuring that the voltage variation range can adapt to different operating modes. The wide variation range of the initial compensation voltage Ucc enables the control scheme to adapt to different voltage regulation requirements, ensuring that the system can still maintain a stable output under different load conditions, thereby improving the flexibility and stability of the system.

[0097] In one embodiment, the algorithm processing unit 23 includes one of an integral control unit, a proportional-integral control unit, and a proportional-integral-differential 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 response speed and adjustment accuracy. If the control accuracy and response speed requirements are very high, the algorithm processing unit 23 can be set as a proportional-integral-differential control unit. The specific configuration 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.

[0098] 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. 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 to process 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 to adjust the initial reference voltage using a second coefficient, for example, . The second addition calculation unit 30 is connected to the second coefficient adjustment unit 29 and receives the preset voltage Vadj, which is used to calculate 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 the range can be set to 0-30V, for example. 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. Maintaining the boost mode can ensure that when the input voltage is insufficient, it can still be increased to the required bus voltage), especially when the load changes greatly, which helps to keep the system running in an ideal state.

[0099] Furthermore, the third calculation unit 138 includes a first addition unit 26 and a third limiter unit 25. The first addition unit 26 is connected to the reference voltage input unit 139 and the second calculation unit 137, specifically to the second addition unit 30 in the reference voltage input unit 139 and the second limiter unit 24 in the second calculation unit 137, to calculate the sum of the reference voltage Uec and the initial compensation voltage Ucc. The third limiter unit 25 is connected to the first addition unit 26 to process the output of the first addition unit 26 to obtain the bus reference voltage Udc_ref.

[0100] The compensation unit 140 may 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 represents the initial reference voltage.

[0101] Specifically, when the system's operating mode changes, such as when the compressor frequency increases or the load increases, the bus voltage needs to be increased to avoid entering a field-weakening state and increasing energy consumption. The first coefficient adjustment unit 21 adjusts the bus voltage using the first coefficient. The difference calculation unit 22 calculates a second difference voltage = the demand voltage Uac - (K1*Udc). Since the demand 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. After processing by the algorithm processing unit 23 and the second limiter unit 24, the second difference voltage is output as the initial compensation voltage Ucc. The first addition calculation unit 26 adds the initial compensation voltage Ucc to the reference voltage Uec, and after limiting the addition, obtains the bus reference voltage Udc_ref. This bus reference voltage Udc_ref is used to control the bus voltage Udc.

[0102] It's worth noting that during this process, field-weakening control and voltage control share input parameters (bus voltage Udc and demand voltage Uac), avoiding duplicate calculations. This design optimizes system efficiency and reduces the hardware's demand for computing resources. This optimization significantly improves system response speed and stability, especially in complex power electronics systems.

[0103] The voltage regulation circuit of this application can significantly improve the overall operating efficiency of an air conditioning system without affecting the control performance of the compressor motor. By adaptively adjusting the bus voltage in real time, the compressor motor can operate at the optimal voltage, improving the overall operating efficiency of the air conditioning system and reducing energy consumption. This method has a simple structure and can share input parameters for both field-weakening control and voltage control, effectively reducing the amount of calculation. The design of the adaptive bus voltage regulation utilizes a concise and efficient mathematical model. Combined with 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 real-time response speed, but also reduces processor burden and hardware requirements, making the system more stable and reliable. The voltage regulation circuit of this application is highly versatile and can adapt to a variety of different types of compressors and drive systems. In actual applications, the operating environment and power supply voltage of the compressor may vary. The adaptive adjustment method eliminates the need for individual debugging of each device, instead achieving voltage optimization through a universal algorithm. This greatly expands the applicability of the technology, making it particularly suitable for air conditioning systems or other compressor drive systems that require large-scale deployment, saving significant time and resources.

[0104] In one embodiment of the present application, in response to the first operating mode, the second voltage input unit 12 provides a first demand voltage Uac1, and the voltage adjustment unit 13 synthesizes the bus voltage Udc and the first demand voltage Uac1 using a first synthesis algorithm to obtain a magnetic field weakening control signal. Furthermore, the bus voltage Udc and the first demand voltage Uac1 are synthesized using a second synthesis algorithm to obtain a first initial compensation voltage Ucc1, and a first bus reference voltage Udc_ref1 is obtained based on the first initial compensation voltage Ucc1. It should be noted that the first operating mode is selected in response to the system frequency being in an increasing state and the load increasing.

[0105] Specifically, when the system frequency is rising and the load is increasing, the system enters the first operating mode. At this time, the bus voltage Udc is insufficient to support the motor operating at a speed that matches the system frequency and load. Therefore, the bus voltage Udc needs to be increased. A first demand voltage Uac1 is generated based on the system frequency and load, and the first demand voltage Uac1 is greater than the bus voltage Udc. The specific process is as described above and will not be repeated here. The voltage control unit 132 derives a first initial compensation voltage Ucc1 based on the bus voltage Udc and the first demand voltage Uac1. At this time, the first initial compensation voltage Ucc1 is in a continuously increasing state. The bus voltage Udc is adjusted using the corresponding first bus reference voltage Udc_ref1, causing the bus voltage Udc to continue to rise until the system stabilizes.

[0106] In one embodiment of the present application, in response to the second operating mode, the second voltage input unit 12 provides a second demand voltage Uac2, and the voltage adjustment unit 13 uses a first synthesis algorithm to synthesize the bus voltage Udc and the second demand voltage Uac2 to obtain a weak magnetic control signal; and uses a second synthesis algorithm to synthesize the bus voltage Udc and the second demand voltage Uac2 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.

[0107] Specifically, when the system frequency is decreasing and the load is reduced, it is in the second operating mode. At this time, the bus voltage Udc is too large, resulting in greater power consumption, so the bus voltage Udc needs to be reduced. At this time, a second demand voltage Uac2 is generated based on the system frequency and load. The second demand voltage Uac2 is less than the bus voltage Udc. The weak magnetic field control unit 131 outputs a weak magnetic field control signal UId=0, and the system operates in a non-weakening state. The specific process is as described above and will not be repeated here. The voltage control unit 132 obtains a second initial compensation voltage Ucc2 based on the bus voltage Udc and the second demand voltage Uac2. At this time, the second initial compensation voltage Ucc2 is in a continuously decreasing state. The corresponding second bus reference voltage Udc_ref2 is used to adjust the bus voltage Udc so that the bus voltage Udc is in a continuously decreasing state until the system stabilizes.

[0108] In one embodiment, the first initial compensation voltage Ucc1 is greater than the second initial compensation voltage Ucc2.

[0109] The voltage regulation circuit of this application, combined with the control logic of the magnetic weakening ring, can adjust the bus voltage in a timely manner, avoiding the magnetic weakening state and improving the efficiency and stability of the compressor. This method not only effectively avoids the problem of insufficient voltage, but also obtains the minimum required bus voltage, reduces losses, and improves the energy efficiency of the air conditioning system.

[0110] See also Figure 6 , Figure 6 This is a flow chart of an embodiment of the voltage adjustment method of the present application, which specifically includes:

[0111] Step S61: Obtain the bus voltage and obtain the required voltage according to the system operation mode.

[0112] This application dynamically adjusts the bus voltage based on the system's operating mode. Finding the minimum bus voltage required to drive the system is crucial. Therefore, this application provides a demand voltage based on the system's operating mode, then derives a bus reference voltage based on the bus voltage and the demand voltage. The bus reference voltage is used to adjust the bus voltage, ensuring that the adjusted bus voltage is the minimum voltage that matches the system's operating mode. This reduces switching losses in the inverter and PFC converter, improves overall operating efficiency, and reduces energy consumption. During this process, a field-weakening control signal is output based on the bus voltage and the demand voltage to ensure the stability and controllability of the dynamic bus voltage adjustment.

[0113] In one embodiment of the present application, in response to the first operating mode, a first required voltage is obtained, and in response to the second operating mode, a second required voltage is obtained.

[0114] Step S62: Generate a flux weakening control signal based on the bus voltage and the demand voltage.

[0115] In one embodiment, the bus voltage and the demand voltage are synthesized using a first synthesis algorithm to generate a field-weakening control signal. The first synthesis algorithm includes calculating a first voltage difference between the bus voltage and the demand voltage, performing a proportional-integral process on the first voltage difference, and limiting the voltage to generate the field-weakening control signal. Specifically, the first voltage difference = bus voltage - demand voltage.

[0116] Specifically, if the system operates in the first operating mode, a field-weakening control signal is generated based on the bus voltage and the first required voltage. Specifically, the bus voltage and the first required voltage are synthesized using a first synthesis algorithm to generate the field-weakening control signal. In this embodiment, the first synthesis algorithm includes calculating a first difference voltage between the bus voltage and the first required voltage, performing a proportional-integral process on the first difference voltage, and limiting the amplitude to generate the field-weakening control signal. Specifically, the first difference voltage = bus voltage - first required voltage.

[0117] If the system operates in the second operating mode, a field-weakening control signal is generated based on the bus voltage and the second required voltage. Specifically, the bus voltage and the second required voltage are synthesized using a first synthesis algorithm to generate the field-weakening control signal. In this embodiment, the first synthesis algorithm includes calculating a first difference voltage between the bus voltage and the second required voltage, performing a proportional-integral process on the first difference voltage, and then limiting the difference voltage to generate the field-weakening control signal. Specifically, the first difference voltage = bus voltage - second required voltage.

[0118] Step S63: Generate a bus reference voltage based on the bus voltage and the demand voltage, and adjust the bus voltage using the bus reference voltage.

[0119] It should be noted that if the system operates in the first operating mode, a first bus reference voltage is obtained based on the bus voltage and the first required voltage. If the system operates in the second operating mode, a second bus reference voltage is obtained based on the bus voltage and the second required voltage. The first bus reference voltage is determined by the first initial compensation voltage, and 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.

[0120] In one embodiment, a second synthesis algorithm is used to synthesize the bus voltage and the demand voltage to generate an initial compensation voltage, and a bus reference voltage is obtained based on the initial compensation voltage. The second synthesis algorithm includes multiplying the bus voltage by a first coefficient to calculate a second voltage difference with the demand voltage, integrating and limiting the second voltage difference to generate the initial compensation voltage. Specifically, the second voltage difference = demand voltage - (K1 * bus voltage), where K1 represents the first coefficient. Because the first coefficient is greater than 0 and less than 1, the voltage control unit activates the field weakening control unit in advance, outputting the initial compensation voltage Ucc, and thereby adjusting the bus voltage to an appropriate level.

[0121] It is understood that if the system is operating in the first operating mode at this time, the bus voltage and the first required voltage are synthesized using a second synthesis algorithm to generate a first initial compensation voltage, and the first bus reference voltage is obtained based on the first initial compensation voltage. The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient, calculating a second difference voltage between the bus voltage and the first required voltage, and integrating and limiting the second difference voltage to generate the first initial compensation voltage.

[0122] If the system is currently operating in the second operating mode, the bus voltage and the second required voltage are synthesized using a second synthesis algorithm to generate a second initial compensation voltage, and a second bus reference voltage is obtained based on the second initial compensation voltage. The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient, calculating a second difference voltage between the bus voltage and the second required voltage, and integrating and limiting the second difference voltage to generate the second initial compensation voltage.

[0123] Furthermore, a reference voltage is obtained; wherein the step of obtaining the reference voltage includes: collecting the AC voltage and calculating its effective value to obtain an initial reference voltage; multiplying the initial reference voltage by a second coefficient and then adding a preset voltage to generate a reference voltage. wherein the second coefficient is, for example, The preset voltage is an adjustment parameter greater than 0, and can be set to a range of 0-30V, for example. Superimposing the preset voltage ensures that the PFC (power factor correction) unit is always in boost mode (the PFC system is a very important part of power electronics. Maintaining the boost mode ensures that even when the input voltage is insufficient, it can still be increased to the required bus voltage). This helps maintain ideal system operation, especially in the presence of large load variations. The initial compensation voltage is added to the reference voltage, and the result is limited to generate the bus reference voltage. Specifically, the sum of the reference voltage and the initial compensation voltage is calculated, and the sum is limited to obtain the bus reference voltage.

[0124] It is understood that if the first operating mode is used, the first initial compensation voltage is added to the reference voltage, and the result of the addition is clipped to generate the first bus reference voltage. If the second operating mode is used, the second initial compensation voltage is added to the reference voltage, and the result of the addition is clipped to generate the second bus reference voltage.

[0125] In one embodiment of the present application, in response to the system frequency being in an increasing state and the load increasing, the system is determined to be in a first operating mode; in response to the system frequency being in a decreasing state and the load decreasing, the system is determined to be in a second operating mode. It is understandable that when the system frequency is in an increasing state and the load is increasing, the bus voltage is insufficient to drive the electrode's operating parameters, such as speed and frequency, to maintain the current operating mode. In this case, the bus voltage needs to be increased. Specifically, a first required voltage is obtained, and then the first initial compensation voltage is in a continuously increasing state to obtain a first bus reference voltage and adjust the bus voltage until the bus voltage stabilizes. When the system frequency is in a decreasing state and the load is reduced, the bus voltage is too high, which will cause greater energy consumption. In this case, the bus voltage needs to be reduced. Specifically, a second required voltage is obtained, and then the second initial compensation voltage is in a continuously decreasing state to obtain a first bus reference voltage and adjust the bus voltage until the bus voltage stabilizes.

[0126] See also Figure 7 , Figure 7 This is a structural diagram of an embodiment of an electronic device of the present application. The electronic device 70 includes a 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.

[0127] The above are merely embodiments of the present invention and are not intended to limit the scope of patent protection of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the scope of patent protection of the present invention.

Claims

1. A voltage regulating circuit, characterized in that: include: A first voltage input unit, used for providing bus voltage; A second voltage input unit, configured to provide a required voltage according to a working mode of the system; a voltage adjustment unit, connected to the first voltage input unit and the second voltage input unit, configured to output a magnetic weakening control signal based on the bus voltage and the required voltage, the voltage adjustment unit further configured 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; In response to the first operating mode, the second voltage input unit provides a first required voltage, the voltage adjustment unit synthesizes the bus voltage and the first required voltage using a first synthesis algorithm to obtain the magnetic field weakening control signal, and synthesizes the bus voltage and the first required voltage using a second synthesis algorithm to obtain a first initial compensation voltage, obtains a first bus reference voltage based on the first initial compensation voltage, and adjusts the bus voltage using the first bus reference voltage. In response to the second operating mode, the second voltage input unit provides a second required voltage, the voltage adjustment unit synthesizes the bus voltage and the second required voltage using a first synthesis algorithm to obtain the magnetic field weakening control signal, and synthesizes the bus voltage and the second required voltage using a second synthesis algorithm to obtain a second initial compensation voltage, obtains a second bus reference voltage based on the second initial compensation voltage, and adjusts the bus voltage using the second bus reference voltage. The first initial compensation voltage is greater than the second initial compensation voltage.

2. The voltage regulating circuit according to claim 1, wherein: The voltage adjustment unit is used to synthesize the bus voltage and the demand voltage using a first synthesis algorithm to obtain the weak magnetic control signal; and to synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain an initial compensation voltage, and to obtain the bus reference voltage based on the initial compensation voltage.

3. The voltage regulating circuit according to claim 2, wherein: The voltage adjustment unit includes: a magnetic weakening control unit, connected to the first voltage input unit and the second voltage input unit, and configured to synthesize the bus voltage and the demand voltage using a first synthesis algorithm; A voltage control unit is connected to the first voltage input unit and the second voltage input unit, and is used to synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain the initial compensation voltage, and obtain the bus reference voltage based on the initial compensation voltage.

4. The voltage regulating circuit according to claim 3, wherein: The magnetic weakening control unit comprises: 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 is connected to the first calculation unit and is used to process the first difference voltage to obtain the magnetic weakening control signal.

5. The voltage regulating 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 regulating 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, configured to synthesize the bus voltage and the demand voltage using a second synthesis algorithm to obtain the initial compensation voltage; a third calculation unit and a reference voltage input unit, wherein the third calculation unit is connected to the second calculation unit and the reference voltage input unit and is configured to obtain the bus reference voltage based on the initial compensation voltage and the reference voltage provided by the reference voltage input unit; A compensation unit is connected to the third calculation unit and the first voltage input unit, and is used to adjust the bus voltage based on the bus reference voltage.

7. The voltage regulating circuit according to claim 6, wherein: The second calculation unit includes: a first coefficient adjustment unit, connected to the first voltage input unit, and configured to adjust the bus voltage using a first coefficient; a difference calculation unit connected to the first coefficient adjustment unit and the second voltage input unit, and configured to calculate a second difference voltage between the demand voltage and the bus voltage after the first coefficient adjustment; an algorithm processing unit connected to the difference calculation unit and configured to perform integration 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-differential control unit; The second limiting unit is connected to the algorithm processing unit and is used to process the output of the algorithm processing unit to obtain the initial compensation voltage.

8. The voltage regulating circuit according to claim 6, wherein: The third computing unit includes: a first adding calculation unit, connected to the reference voltage input unit and the second calculation unit, and configured to calculate the sum of the reference voltage and the initial compensation voltage; The third limiting unit is connected to the first adding unit and is used to process the output of the first adding unit to obtain the bus reference voltage.

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

10. The voltage regulating circuit according to claim 1, wherein: In response to the system frequency being in an increasing state and the load increasing, entering the first working mode; In response to the system frequency being in a decreasing state and the load being reduced, the system is in the second working mode.

11. A voltage adjustment method, characterized in that: include: Obtain bus voltage and obtain required voltage according to the system working mode; generating a flux weakening control signal based on the bus voltage and the demand voltage; generating a bus reference voltage based on the bus voltage and the required voltage, and adjusting the bus voltage using the bus reference voltage; The steps for obtaining the required voltage according to the system operating mode include: In response to the first operating mode, obtaining a first required voltage; The step of generating a magnetic field weakening control signal based on the bus voltage and the required voltage includes: obtaining the magnetic 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; The steps for obtaining the required voltage according to the system operating mode include: In response to the second operating mode, obtaining a second required voltage; The step of generating a magnetic field weakening control signal based on the bus voltage and the required voltage includes: obtaining the magnetic 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; 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.

12. The voltage adjustment method according to claim 11, wherein: The step of generating a magnetic field weakening control signal based on the bus voltage and the demand voltage includes: synthesizing the bus voltage and the demand voltage using a first synthesis algorithm to generate the magnetic 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.

13. The voltage adjustment method according to claim 12, wherein: The first synthesis algorithm includes: calculating a first difference voltage between the bus voltage and the demand voltage, performing proportional-integral processing on the first difference voltage and limiting the amplitude to generate the field weakening control signal; The second synthesis algorithm includes: multiplying the bus voltage by a first coefficient to calculate a second difference voltage with the required voltage, and integrating and limiting the second difference voltage to generate the initial compensation voltage.

14. The voltage adjustment method according to claim 12, wherein: The step of obtaining the bus reference voltage based on the initial compensation voltage includes: Get the reference voltage; The initial compensation voltage is added to the reference voltage, and a limiting process is performed on the addition result to generate the bus reference voltage.

15. The voltage adjustment method according to claim 14, wherein: The steps for obtaining the reference voltage include: Collect the AC voltage and calculate its effective value to obtain the initial reference voltage; The reference voltage is generated by multiplying the initial reference voltage by a second coefficient and then adding a preset voltage.

16. The voltage adjustment method according to claim 11, wherein: In response to the system frequency being in an increasing state and the load increasing, determining that the system is in the first operating mode; In response to the system frequency being in a decreasing state and the load being reduced, it is determined that the system is in the second operating mode.

17. An electronic device, characterized in that: The voltage regulating circuit comprises the voltage regulating circuit according to any one of claims 1 to 10.

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