Frequency converter circuit and frequency conversion system

Abstract

The utility model relates to a frequency converter circuit and a frequency conversion system. The frequency converter circuit comprises a power conversion module and at least two frequency conversion modules, the power conversion module comprises a power interface and is electrically connected with the at least two frequency conversion modules through the power interface; the power supply conversion module is used for converting external power supply voltage into working voltage of the frequency conversion module; the frequency conversion module is used for controlling the connected frequency conversion load based on the working voltage. According to the technical scheme, the number of the power conversion modules is reduced, the structure of the frequency converter circuit is simplified, the overall size of a frequency conversion system is reduced, and the cost of the frequency conversion system is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of frequency converter technology, and in particular to a frequency converter circuit and frequency conversion system. Background Technology

[0002] With the widespread application of variable frequency technology in washing machines and dryers, the demand for multiple variable frequency motors in the same machine is increasing, such as variable frequency motors, variable frequency fans, variable frequency drain pumps, and variable frequency compressors.

[0003] In related technologies, each variable frequency motor or variable frequency compressor needs to be equipped with a frequency converter, and each frequency converter includes a power conversion module to supply power to the frequency converter, resulting in a large size and high cost of the entire variable frequency system. Utility Model Content

[0004] To solve the above-mentioned technical problems, or at least partially solve them, this disclosure provides a frequency converter circuit and a frequency conversion system that reduces the number of power conversion modules, thereby simplifying the structure of the frequency converter circuit, reducing the overall size of the frequency conversion system, and lowering the cost of the frequency conversion system.

[0005] In a first aspect, this disclosure provides a frequency converter circuit, including:

[0006] Power conversion module and at least two frequency converter modules;

[0007] The power conversion module includes a power interface, and the power conversion module is electrically connected to at least two of the frequency converter modules through the power interface;

[0008] The power conversion module is used to convert the external power supply voltage into the operating voltage of the frequency converter module; the frequency converter module is used to control the connected frequency converter load based on the operating voltage.

[0009] Optionally, the power interface includes a first power interface and a second power interface; the operating voltage of the frequency converter module corresponding to the first power interface is greater than the operating voltage of the frequency converter module corresponding to the second power interface.

[0010] Optionally, the power conversion module is electrically connected to at least two frequency converter modules via one of the power interfaces.

[0011] Optionally, the power conversion module includes multiple power interfaces, and the frequency converter is electrically connected to the power conversion module through one-to-one corresponding power interfaces.

[0012] Optionally, the power conversion module includes a rectifier module, a filter module, and a step-down module. The first terminal of the rectifier module is connected to an external power supply voltage. The second terminal of the rectifier module is electrically connected to the first terminal of the filter module. The second terminal of the filter module is electrically connected to both the first power interface and the first terminal of the step-down module. The second terminal of the step-down module is electrically connected to the second power interface.

[0013] Optionally, the frequency converter circuit includes a first frequency converter and at least two second frequency converters;

[0014] Both the first frequency converter and the second frequency converter include the frequency conversion module, and the power conversion module is located in the first frequency converter.

[0015] Optionally, the inverter circuit includes a power supply board and a plurality of third inverters; the power supply board includes a power conversion module; each of the third inverters includes one inverter module.

[0016] Optionally, the inverter circuit includes: at least two power conversion modules, each of the power conversion modules being electrically connected to at least two inverter modules via the power interface; different power conversion modules are electrically connected to different inverter modules.

[0017] Optionally, different power conversion modules may convert different operating voltages of the frequency converter module.

[0018] Secondly, this disclosure also provides a frequency conversion system, including the frequency converter circuit as described in the first aspect.

[0019] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0020] This disclosure provides a frequency converter circuit and a frequency conversion system. The frequency converter circuit includes a power conversion module and at least two frequency conversion modules. The power conversion module includes a power interface and is electrically connected to the at least two frequency conversion modules through the power interface. The power conversion module is used to convert an external power supply voltage into the operating voltage of the frequency conversion modules. The frequency conversion modules are used to control the connected frequency conversion load based on the operating voltage. Therefore, by setting the power conversion module to include a power interface and electrically connecting it to at least two frequency conversion modules, this disclosure eliminates the need for a separate power conversion module for each frequency conversion module. This allows one power conversion module to supply power to multiple frequency conversion modules, reducing the number of power conversion modules, thereby simplifying the structure of the frequency converter circuit, reducing the overall size of the frequency conversion system, and lowering the cost of the frequency conversion system. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a frequency converter circuit provided in an embodiment of the present disclosure;

[0024] Figure 2 This is a schematic diagram of another inverter circuit provided in an embodiment of the present disclosure;

[0025] Figure 3 This is a schematic diagram of another inverter circuit provided in an embodiment of the present disclosure;

[0026] Figure 4 This is a schematic diagram of another inverter circuit provided in an embodiment of the present disclosure;

[0027] Figure 5 This is a schematic diagram of another inverter circuit provided in an embodiment of the present disclosure;

[0028] Figure 6 This is a schematic diagram of another inverter circuit provided in an embodiment of the present disclosure.

[0029] The components include: 1. Power conversion module; 2. Frequency converter module; 3. Power interface; 4. Frequency converter load; 11. Rectifier module; 12. Filter module; 13. Step-down module; 14. Voltage regulator module; 21. First power input interface; 22. Second power input interface; 31. First power interface; 32. Second power interface; 101. First frequency converter; 102. Second frequency converter; 103. Third frequency converter; 104. Power board. Detailed Implementation

[0030] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0031] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0032] Figure 1 This is a schematic diagram of the structure of a frequency converter circuit provided in an embodiment of the present disclosure, such as... Figure 1 As shown, the inverter circuit includes: a power conversion module 1 and at least two inverter modules 2; the power conversion module 1 includes a power interface 3, and the power conversion module 1 is electrically connected to at least two inverter modules 2 through the power interface 3; the power conversion module 1 is used to convert the external power supply voltage U0 into the operating voltage of the inverter modules 2; the inverter modules 2 are used to control the connected inverter load 4 based on the operating voltage.

[0033] Specifically, such as Figure 1 As shown, since the external power supply voltage U0 is different from the operating voltage of the frequency converter module 2, and the external power supply voltage is AC, the frequency converter module 2 needs to use DC to control the connected frequency converter load 4. Therefore, the power conversion module 1 is connected to the external power supply voltage U0, and converts the external power supply voltage U0 into the operating voltage of the frequency converter module 2 and outputs it to the frequency converter module 2.

[0034] The frequency converter module 2 is, for example, an IPM (Intelligent Power Module). On the one hand, the operating voltage supplies power to the frequency converter module 2 to drive it to work. On the other hand, the frequency converter module 2 controls its internal switching devices to convert the operating voltage into a variable frequency AC voltage to drive the frequency converter load 4 to work.

[0035] Figure 1 The example illustrates a power conversion module 1, two frequency converter modules 2, and two frequency conversion loads 4. Each frequency converter module 2 is electrically connected to a corresponding frequency conversion load 4. The power conversion module 1 is provided with a power interface 3, which is electrically connected to at least two frequency converter modules 2. This allows the power conversion module 1 to supply power to at least two frequency converter modules 2, eliminating the need for a power conversion module 1 to supply power to each frequency converter module 2. This enables one power conversion module 1 to supply power to multiple frequency converter modules 2, reducing the number of power conversion modules 1, thereby simplifying the structure of the frequency converter circuit, reducing the overall size of the frequency conversion system, and lowering the cost of the frequency conversion system.

[0036] It should be noted that the number of frequency converter modules 2 can be set according to actual usage requirements, and this embodiment does not limit this.

[0037] It should be noted that the variable frequency load 4 can be, for example, a variable frequency motor, a variable frequency compressor, etc., and this embodiment does not limit it.

[0038] This embodiment of the disclosure provides a power conversion module 1 including a power interface 3. The power conversion module 1 is electrically connected to at least two frequency converter modules 2 through the power interface 3. This eliminates the need to provide a power conversion module 1 to each frequency converter module 2, thus enabling one power conversion module 1 to supply power to multiple frequency converter modules 2. This reduces the number of power conversion modules 1, thereby simplifying the structure of the frequency converter circuit, reducing the overall size of the frequency converter system, and lowering the cost of the frequency converter system.

[0039] Figure 2 This is a schematic diagram of another inverter circuit provided in an embodiment of this disclosure. Optionally, as shown... Figure 2 As shown, the power interface 3 includes a first power interface 31 and a second power interface 32; the operating voltage of the frequency converter module 2 corresponding to the first power interface 31 is greater than the operating voltage of the frequency converter module 2 corresponding to the second power interface 32.

[0040] Specifically, such as Figure 2 As shown, the power interface 3 includes a first power interface 31 and a second power interface 32. The operating voltage of the frequency converter module 2 corresponding to the first power interface 31 is, for example, a first voltage U1, and the operating voltage of the frequency converter module 2 corresponding to the second power interface 32 is a second voltage U2. The first voltage U1 is greater than the second voltage U2. The frequency converter module 2 may include, for example, a first power input interface 21 and a second power input interface 22. The first power interface 31 is electrically connected to the first power input interface 21, and the second power interface 32 is electrically connected to the second power input interface 22. The first voltage U1 is transmitted to the frequency converter module 2 through the first power interface 31 and the first power input interface 21, and the second voltage U2 is transmitted to the frequency converter module 2 through the second power interface 32 and the second power input interface 22.

[0041] The frequency converter module 2 controls its internal switching devices to convert the first voltage U1 into a variable frequency AC voltage to drive the frequency converter load 4. The second voltage U2 is used to drive the frequency converter module 2 itself to work, for example, to enable the frequency converter module 2 to connect to the control signal E1 sent by the MCU. The control signal E1 is used to adjust the frequency of the AC voltage output by the frequency converter module 2.

[0042] Optionally, combined Figure 1 and Figure 2 The power conversion module 1 is electrically connected to at least two frequency converter modules 2 through a power interface 3.

[0043] Specifically, in combination Figure 1 and Figure 2 A power interface 3 can be reserved in the power conversion module 1. Figure 2A first power interface 31 and a second power interface 32 can be considered as a single power interface 3. The power conversion module 1 is electrically connected to at least two frequency converter modules 2 through this power interface 3 to reduce the cost of the frequency converter system. For each additional frequency converter module 2, a wire can be added to the power interface 3 to electrically connect it to the added frequency converter module 2. For example, when adding a frequency converter module 2, wires are added to both the first power interface 31 and the second power interface 32. The wire added to the first power interface 31 is electrically connected to the first power input interface 21 of the added frequency converter module 2, and the wire added to the second power input interface 32 is electrically connected to the second power input interface 22 of the added frequency converter module 2.

[0044] Figure 3 This is a schematic diagram of another inverter circuit provided in an embodiment of this disclosure. Optionally, as shown... Figure 3 As shown, the power conversion module 1 includes multiple power interfaces 3, and the frequency converter module 2 is electrically connected to the power conversion module 1 through corresponding power interfaces 3.

[0045] Figure 3 The example illustrates a power conversion module 1 comprising two power interfaces 3 and two frequency converter modules 2. The number of power interfaces 3 is the same as the number of frequency converter modules 2 that need to be electrically connected to the power conversion module 1. Each frequency converter module 2 is electrically connected to the power conversion module 1 via a corresponding power interface 3. Therefore, by reserving multiple power interfaces 3 in the power conversion module 1, when adding a frequency converter module 2, it is only necessary to electrically connect it to one of the reserved power interfaces 3 in the power conversion module 1, thus improving the expandability of the power conversion module 1 and simplifying the method of electrically connecting the frequency converter module 2 to the power conversion module 1.

[0046] It should be noted that the number of power interfaces 3 in this embodiment can be set according to the number of frequency converter modules 2, and there is no limitation thereto.

[0047] Figure 4 This is a schematic diagram of another inverter circuit provided in an embodiment of this disclosure. Optionally, as shown... Figure 4 As shown, the power conversion module 1 includes a rectifier module 11, a filter module 12, and a step-down module 13. The first end of the rectifier module 11 is connected to an external power supply voltage U0. The second end of the rectifier module 11 is electrically connected to the first end of the filter module 12. The second end of the filter module 12 is electrically connected to the first power interface 31 and the first end of the step-down module 13, respectively. The second end of the step-down module 13 is electrically connected to the second power interface 32. Figure 4 The example shown is a variable frequency load 4, such as a variable frequency motor.

[0048] Specifically, such as Figure 4As shown, the first terminal of the rectifier module 11 is connected to an external power supply voltage U0. The rectifier module 11 converts the AC power from the external power supply into DC power and uses it as the operating voltage. The second terminal of the rectifier module 11 is electrically connected to the first terminal of the filter module 12. The filter module 12 filters out abnormal electrical signals such as noise or high-frequency signals from the operating voltage, preventing abnormal electrical signals from damaging the inverter circuit and improving the safety of the inverter circuit. The second terminal of the filter module 12 is electrically connected to the first power interface 31, outputting the filtered operating voltage to the inverter module 2. The inverter module 2 controls its internal switching devices to convert the operating voltage output from the first power interface 31 into a three-phase voltage with a variable frequency to drive the inverter load 4. The second end of the filter module 12 is also electrically connected to the first end of the step-down module 13. The step-down module 13 steps down the filtered working voltage. The second end of the step-down module 13 is electrically connected to the second power interface 32 through the voltage regulator module 14. The voltage regulator module 14 is used to stabilize the working voltage at the set value and improve the stability of the circuit operation. The stepped-down working voltage output by the second power interface 32 drives the frequency converter module 2 to work.

[0049] In some embodiments, the external power supply voltage U0 is 220V AC. The rectifier module 11 converts the 220V AC to 310V DC. The filter module 12 filters out abnormal electrical signals in the 310V DC. The filter module 12 transmits the 310V DC to the frequency converter module 2 through the first power interface 31. The filter module 12 also transmits the 310V DC to the step-down module 13. The step-down module 13 converts the 310V DC to, for example, 15V, and outputs it to the frequency converter module 2 after being stabilized by the voltage regulator module 14, so as to drive the frequency converter module 2 to work.

[0050] It should be noted that the specific structures of the rectifier module 11, filter module 12, step-down module 13, and voltage regulator module 14 are well known to those skilled in the art, and are not limited in this embodiment. Furthermore, the specific voltage values ​​converted by the rectifier module 11 and step-down module 13 can be set according to the actual usage of the inverter circuit, and are not limited in this embodiment.

[0051] Optionally, combined Figures 1 to 3 The inverter circuit includes a first inverter 101 and at least two second inverters 102; both the first inverter 101 and the second inverter 102 include an inverter module 2, and the power conversion module 1 is located in the first inverter 101.

[0052] Specifically, in combination Figures 1 to 3The first frequency converter 101 includes a power conversion module 1 and can be used as the main frequency converter. The power conversion module 1 and the frequency conversion module 2 in the first frequency converter 101 are integrated. The second frequency converter 102 is used as an extension frequency converter. The second frequency converter 102 does not include the power conversion module 1. The second frequency converter 102 is electrically connected to the power conversion module 1 through the power interface 3. The power conversion module 1 in the first frequency converter 101 is used to supply power to the second frequency converter 102, which saves space for the second frequency converter 102, reduces the size of the second frequency converter 102, and reduces the cost of the frequency conversion system.

[0053] Reference Figure 4 It can be seen that when the power conversion module 1 and the frequency converter module 2 are both located in the same frequency converter, the power conversion module 1 can be directly electrically connected to the frequency converter module 2 through wires to simplify the connection method.

[0054] Figure 5 This is a schematic diagram of another inverter circuit provided in an embodiment of this disclosure. Optionally, as shown... Figure 5 As shown, the inverter circuit includes a power supply board 104 and multiple third inverters 103; the power supply board 104 includes a power conversion module 1; each third inverter 103 includes a frequency conversion module 2.

[0055] Specifically, such as Figure 5 As shown, the inverter circuit includes a power supply board 104, on which a power conversion module 1 is mounted. None of the third inverters 103 include a power conversion module 1. The power conversion module 1 on the power supply board 104 is electrically connected to multiple third inverters 103 via power interfaces 3. Power is supplied to the multiple third inverters 103 using the power conversion module 1 on the power supply board 104, thereby reducing the size of the third inverters 103 and facilitating their integration with the variable frequency load 4, thus improving the integration level of the inverter system. Furthermore, the flexible placement of the power supply board 104 also enhances the flexibility of the placement of the power conversion module 1.

[0056] It should be noted that, Figure 5 The example shown only illustrates that the power conversion module 1 includes one power interface 3. Multiple power interfaces 3 can also be provided in the power conversion module 1 according to the number of frequency conversion modules 2. The present disclosure does not specifically limit the number of power interfaces 3.

[0057] Figure 6 This is a schematic diagram of another inverter circuit provided in an embodiment of this disclosure. Optionally, as shown... Figure 6 As shown, the inverter circuit includes: at least two power conversion modules 1, each power conversion module 1 being electrically connected to at least two inverter modules 2 via a power interface 3; different power conversion modules 1 are electrically connected to different inverter modules 2.

[0058] Specifically, such as Figure 6 As shown, the power conversion module 1 can only provide a limited amount of power. When there are too many frequency converter modules 2, the power conversion module 1 cannot supply power to all of them. Therefore, the frequency converter circuit can be configured to include at least two power conversion modules 1, for example... Figure 6 The first power conversion module 111 and the second power conversion module 112 shown are described. For example, the first power conversion module 111 can be electrically connected to A frequency converter modules 2 and the maximum load power of the first power conversion module 1 is reached. After adding more frequency converter modules 2, the (A+1)th frequency converter module 2 and subsequent frequency converter modules 2 are electrically connected to the second power conversion module 112 until the maximum load power of the second power conversion module 112 is reached.

[0059] For example, the first power conversion module 111 can be integrated with one frequency converter module 2 and serve as the main frequency converter, while other frequency converter modules 2 are located in the expansion frequency converter. Similarly, the second power conversion module 112 can be integrated with one frequency converter module 2 and serve as the main frequency converter, while other frequency converter modules 2 are located in the expansion frequency converter. Alternatively, both the first power conversion module 111 and the second power conversion module 112 can be located in the power board 104, and both frequency converter modules 2 can be located in the expansion frequency converter.

[0060] Figure 6 Two power conversion modules 1 are illustrated in the example. Each power conversion module 1 is electrically connected to two frequency converter modules 2. The number of power conversion modules 1 and the frequency converter modules 2 electrically connected to the corresponding power conversion modules 1 can be set according to the actual usage requirements of the frequency converter circuit. This embodiment does not limit this.

[0061] Optionally, such as Figure 6 As shown, the operating voltage of the frequency converter module 2 is different for different power conversion modules 1.

[0062] Specifically, such as Figure 6 As shown, since different frequency conversion modules 2 in the frequency conversion system require different operating voltages to drive the frequency conversion load 4, or because the manufacturing processes of the related control devices of the frequency conversion modules 2 are different, the operating voltage required for the operation of the frequency conversion modules 2 is different. Therefore, at least two power conversion modules 1 can be set up. Each power conversion module 1 is electrically connected to at least two frequency conversion modules 2 through a power interface 3. The operating voltages of the frequency conversion modules 2 converted by different power conversion modules 1 are different, so that different frequency conversion modules 2 control the connected frequency conversion load 4 based on the operating voltage.

[0063] Therefore, the power conversion module 1 can provide the working voltage to the frequency converter module 2 more accurately, avoiding the problem that the frequency converter module 2 cannot drive the frequency conversion load 4 normally due to the mismatch between the working voltage provided by the power conversion module 1 and the working voltage required by the frequency converter module 2, thus improving the adaptability of the frequency converter circuit.

[0064] This disclosure also provides a frequency converter system, which includes the frequency converter circuit described in the above embodiments. Therefore, the frequency converter system provided in this disclosure has the beneficial effects described in the above embodiments, and will not be elaborated further here. Furthermore, the frequency converter system described in this disclosure can be installed in household appliances such as air conditioners, washing machines, and refrigerators; this disclosure does not specifically limit its application in this regard.

[0065] This disclosure provides a frequency converter circuit and a frequency conversion system. The frequency converter circuit includes a power conversion module and at least two frequency conversion modules. The power conversion module includes a power interface and is electrically connected to the at least two frequency conversion modules through the power interface. The power conversion module is used to convert an external power supply voltage into the operating voltage of the frequency conversion modules. The frequency conversion modules are used to control the connected frequency conversion load based on the operating voltage. The frequency converter circuit provided in this disclosure eliminates the need for a separate power conversion module for each frequency conversion module, allowing one power conversion module to supply power to multiple frequency conversion modules. This reduces the number of power conversion modules, simplifies the structure of the frequency converter circuit, reduces the overall size of the frequency conversion system, and lowers the cost of the frequency conversion system.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0067] The above are merely specific embodiments of this disclosure, enabling those skilled in the art to understand or implement this disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A frequency converter circuit, characterized in that, include: Power conversion module and at least two frequency converter modules; The power conversion module includes a power interface, and the power conversion module is electrically connected to at least two of the frequency converter modules through the power interface; The power conversion module is used to convert the external power supply voltage into the operating voltage of the frequency converter module; the frequency converter module is used to control the connected frequency converter load based on the operating voltage.

2. The inverter circuit according to claim 1, characterized in that, The power interface includes a first power interface and a second power interface; the operating voltage of the frequency converter module corresponding to the first power interface is greater than the operating voltage of the frequency converter module corresponding to the second power interface.

3. The inverter circuit according to claim 1, characterized in that, The power conversion module is electrically connected to at least two frequency converter modules through one of the power interfaces.

4. The inverter circuit according to claim 1, characterized in that, The power conversion module includes multiple power interfaces, and the frequency converter is electrically connected to the power conversion module through one-to-one corresponding power interfaces.

5. The inverter circuit according to claim 2, characterized in that, The power conversion module includes a rectifier module, a filter module, and a step-down module. The first terminal of the rectifier module is connected to an external power supply voltage. The second terminal of the rectifier module is electrically connected to the first terminal of the filter module. The second terminal of the filter module is electrically connected to both the first power interface and the first terminal of the step-down module. The second terminal of the step-down module is electrically connected to the second power interface.

6. The frequency converter circuit according to claim 1, characterized in that, The inverter circuit includes a first inverter and at least two second inverters; Both the first frequency converter and the second frequency converter include the frequency conversion module, and the power conversion module is located in the first frequency converter.

7. The inverter circuit according to claim 1, characterized in that, The inverter circuit includes a power supply board and multiple third inverters; the power supply board includes the power conversion module; each of the third inverters includes one inverter module.

8. The frequency converter circuit according to claim 1, characterized in that, The inverter circuit includes at least two power conversion modules, each power conversion module being electrically connected to at least two inverter modules via the power interface; different power conversion modules are electrically connected to different inverter modules.

9. The frequency converter circuit according to claim 8, characterized in that, The operating voltage of the frequency converter module is different depending on the power conversion module.

10. A frequency conversion system, characterized in that, Includes the frequency converter circuit as described in any one of claims 1-9.

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