Electric device driving system and method for assembling electric device driving system

Abstract

The invention provides an electric device driving system and an assembling method of the electric device driving system. The electric device driving system is arranged between a power grid and an electric device and comprises an input end, a plurality of driving modules and an output end. The input end is electrically connected with a power grid and configured to be capable of taking electricity from the power grid. The plurality of driving modules are cascaded on the input end, and the voltage of the power grid is distributed to the plurality of driving modules. The plurality of driving modules are all connected to the output end, and the output end is configured to be capable of supplying power to the electric device. Wherein each driving module comprises a driving branch, and the plurality of driving modules are configured to independently control the on-off of the driving branch in the driving module, so that the plurality of driving modules output different voltages to the output end. The embodiment of the invention can adapt to power grids with different voltage values, can output different voltages at the same time, is suitable for different electric devices or different working states of the same electric device, supports bidirectional flow of energy, and has relatively good expandability and energy-saving and efficiency-increasing effects.

Description

Technical Field

[0001] This invention relates to the field of power supply and drive technology, and in particular to an electric device drive system and an assembly method for the electric device drive system. Background Technology

[0002] Electric devices are driven by electricity. Under normal circumstances, power is drawn from the power grid and supplied to the electric device through a drive system, such as a driver. The driver includes devices that step up or down the voltage of the power grid and rectify it. However, existing drive systems can only output a basically fixed voltage, which cannot be adjusted, resulting in poor flexibility and an inability to adapt to different voltage sources and voltage outputs.

[0003] On the other hand, with the development of new energy sources, DC power grids are beginning to be used in some scenarios. However, existing drive systems are poorly adapted to DC power grids and cannot adapt to DC power supplies with different voltages, thus limiting their application. Drive systems typically need to be developed separately for the power grid and the electric device, lacking scalability.

[0004] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Summary of the Invention

[0005] To address one or more deficiencies in the prior art, the present invention provides an electric device drive system disposed between the power grid and the electric device, the electric device drive system comprising:

[0006] An input terminal is electrically connected to the power grid and configured to draw power from the power grid.

[0007] Multiple drive modules, cascaded at the input terminal, are distributed with the voltage of the power grid to the drive modules; and

[0008] The output terminal is connected to all of the plurality of drive modules, and the output terminal is configured to supply power to the electric device.

[0009] The driving module includes a driving branch, and the plurality of driving modules are configured to independently control the on / off state of the driving branch in their respective driving modules, so that the plurality of driving modules output different voltages to the output terminal.

[0010] According to some aspects of the present invention, the driving module includes a plurality of driving branches and a plurality of output branches, the plurality of driving branches being connected in parallel at the input terminal, and each driving branch being connected to the output terminal through one of the output branches.

[0011] According to some aspects of the present invention, the drive branch includes a first switch and a second switch, the first switch and the second switch being connected in series in the drive branch, and the connection point between the output branch and the drive branch being located between the first switch and the second switch.

[0012] According to some aspects of the invention, a third switch is provided on the output branch, the on / off state of the third switch being controlled independently of the on / off states of the first switch and the second switch.

[0013] According to some aspects of the invention, the drive module includes a capacitor, and the third switch includes a bidirectional switching transistor; the capacitor is connected in parallel with the drive branch and configured to recover the kinetic energy of the electric device.

[0014] According to some aspects of the invention, the drive module includes three drive branches, and the output terminal is configured to output three-phase alternating current.

[0015] According to some aspects of the invention, the input of the drive branch is a DC circuit, and the output is converted into an AC output.

[0016] According to some aspects of the invention, the power grid outputs direct current to the electric device drive system; or the input terminal is configured to output direct current to the drive module.

[0017] According to some aspects of the invention, the plurality of drive modules are connected in series at the input terminal, and the voltage of the power grid is uniformly distributed to the plurality of drive modules, or the voltage of the power grid is distributed to the plurality of drive modules according to the equivalent impedance of each of the drive modules.

[0018] According to some aspects of the present invention, the electric drive system further includes a control circuit that is signal-connected to the drive module and configured to control the on / off state of the drive branch and the output branch.

[0019] According to some aspects of the present invention, the present invention also includes an assembly method for an electric actuator drive system, for assembling the electric actuator drive system as described above, the assembly method comprising:

[0020] Obtain the output parameters of the power grid;

[0021] Obtain at least one operating voltage for the electric actuator;

[0022] The combination of multiple drive modules is determined based on the output parameters of the power grid and at least one operating voltage of the electric device;

[0023] Provides input and output terminals;

[0024] Multiple driver modules are cascaded at the input terminal;

[0025] The output parameters of the power grid include the voltage of the power grid, and the combination of the multiple drive modules includes the number of drive modules and the voltage allocated by the power grid to each drive module.

[0026] According to some aspects of the invention, in the step of determining the combination of the plurality of drive modules, the plurality of drive modules are configured to output different voltages, and the voltages output by the plurality of drive modules include at least one operating voltage of the electric device.

[0027] Compared with existing technologies, embodiments of the present invention provide an electric device drive system, including multiple drive modules. The voltage of the power grid is distributed to these drive modules, and by adjusting the number or parameters of the drive modules, it can adapt to power grids with different voltage values. Simultaneously, each drive module can independently control the on / off state of its drive branch, allowing the electric device drive system to output different voltages, suitable for different electric devices or different operating states of the same electric device. The electric device drive system in this embodiment can expand its applicability through modularity and is applicable to DC power grids, supporting bidirectional energy flow and contributing to energy conservation and efficiency.

[0028] The present invention also relates to an assembly method for an electric device drive system, for assembling the aforementioned electric device drive system. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 These are structural block diagrams of the electric device drive system in some embodiments of the present invention;

[0031] Figure 2 These are circuit diagrams of the driving module in some embodiments of the present invention;

[0032] Figure 3 This is a circuit diagram showing multiple drive modules connected in series in some embodiments of the present invention;

[0033] Figures 4A-4C This is a schematic diagram showing two driving modules outputting different voltages in some embodiments of the present invention;

[0034] Figure 5 This is a flowchart illustrating the assembly method of the electric device drive system in some embodiments of the present invention. Detailed Implementation

[0035] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] The embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] Figure 1 The components and connections of the electric drive system 1 according to some embodiments of the present invention are shown. Figure 2 The circuit of the drive module 12 according to some embodiments of the present invention is shown below, in conjunction with... Figure 1 and Figure 2 The electric drive system 1 will be described.

[0042] like Figure 1 As shown, the electric drive system 1 is located between the power grid 2 and the electric device 3. It can draw power from the power grid 2 and supply power to the electric device 3. The power grid 2 can be, for example, an AC power grid, a DC power grid, or a DC power source. The electric device 3 includes, for example, an electric motor.

[0043] In this embodiment, the electric device drive system 1 includes an input terminal 11, multiple drive modules 12, and an output terminal 13. The input terminal 11 is connected to the power grid 2 and is configured to draw power from the power grid 2, for example, by connecting to the household power grid via an interface. The multiple drive modules 12 perform power parameter conversion, such as voltage conversion, and output the converted parameters through the output terminal. The output terminal 13 is configured to supply power to the electric device 3, for example, by providing a power supply interface for the electric device 3. Figure 1 In the diagram, the electric drive system 1 is shown as independent of the electric device 3. However, it is readily understood by those skilled in the art that the electric drive system 1 can also be integrated into the electric device 3, and the output terminal 13 is connected to the power supply line of the electric device 3.

[0044] Multiple driver modules 12 ( Figure 1 The example shown is 12-1, 12-2...12-N. Figure 2The diagram shows one of the drive modules 12 cascaded on the input terminal 11. The voltage of the power grid 2 is distributed to multiple drive modules 12. Specifically, for example, multiple drive modules 12 form a voltage divider circuit. Multiple drive modules 12 are connected in series on the input terminal 11. Multiple drive modules 12 can divide the voltage according to the equivalent impedance. The voltages of multiple drive modules 12 can be the same, for example, the equivalent impedances of multiple drive modules 12 are equal. The voltages of multiple drive modules 12 can also be different, for example, the voltage of the power grid 2 is distributed according to the ratio of the equivalent impedances of different drive modules 12. The specifics will be explained in subsequent embodiments.

[0045] Output terminal 13 is located between drive module 12 and electric device 3. Multiple drive modules 12 are connected to output terminal 13, and power is supplied to electric device 3 from output terminal 13. Specifically, output terminal 13 can be configured to match the power supply line of electric device 3. For example, output terminal 13 can be directly connected to the power supply line of electric device 3, or output terminal 13 can be configured to include an interface that facilitates electrical connection of electric device 3. In some specific embodiments, electric device 3 includes a three-phase motor. Electric device drive system 1 outputs three-phase AC power to electric device 3 through output terminal 13. Output terminal 13 can be configured as a four-hole three-phase socket. Output terminal 13 can also be directly connected to electric device through a cable, for example, directly connected to the three-phase motor in electric device.

[0046] like Figure 2 As shown, in this embodiment, the drive module 12 includes drive branches 121. Each drive branch 121 can output voltage through its nodes. Each drive module 12 is configured to independently control the on / off state of its drive branch 121, so that multiple drive modules 12 output different voltages to the output terminal. For example, a switch (e.g., ...) can be provided on the drive branch 121 in each drive module 12. Figure 2 The first switch 123 and the second switch 124 shown in the figure can be configured to be individually controlled to turn on or off, thereby controlling the on / off state of the drive branch 121. The switches on the drive branch 121 will be specifically described in subsequent embodiments. The drive module 12 can be configured to output voltage to the output terminal 13 when the drive branch 121 is connected or disconnected (and can output different voltages when the drive branch 121 is connected or disconnected). In this embodiment, multiple drive modules 12 are independently controlled, which can form a variety of different connection circuits between the power grid 2 and the electric device 3, and output different voltages to the output terminal 12, making it suitable for different electric devices 3.

[0047] In embodiments of the present invention, the voltages obtained by the multiple drive modules 12 from the power grid 2 can be the same or different, and can be applied to AC or DC power grids. Especially for DC power grids, the drive modules 12 can be used to divide the voltage of the power grid 2 and can be adapted to DC power grids with different voltage values. For example, the multiple drive modules 12 can form different potentials, and in this embodiment, the drive branches 121 of the multiple drive modules 12 are independently controlled to switch on and off, and can output different voltage values ​​to the output terminal 13, thereby enabling them to work with different electric devices 3 or different operating modes of the electric devices 3.

[0048] In this embodiment, the drive module 12 can be modularly cascaded, and its number can be adjusted according to the power grid 2 and the electric device 3, offering a high degree of freedom. Multiple drive modules 12 can adapt to voltage values ​​from different DC power sources, which is beneficial for cooperating with the DC grid infrastructure of new energy power generation. Furthermore, it can be expanded or have a certain degree of redundancy set, which helps to improve the safety of the electric device drive system 1.

[0049] According to a preferred embodiment of the present invention, such as Figure 2 As shown, the drive module 12 includes multiple drive branches 121 and multiple output branches 122. The multiple drive branches 121 are connected in parallel at the input terminal 11, and each drive branch 121 is connected to the output terminal 13 through an output branch 122. In different embodiments of the present invention, the power supply type of the electric device 3 is not limited. For example, the power supply type of the electric device 3 can be 380V three-phase, 380V two-phase, or 220V single-phase, etc., and correspondingly, the number of power supply lines to the electric device 3 will differ. Specifically, as shown... Figure 2 As shown, in this embodiment, a drive module 12 includes three drive branches 121 and three corresponding output branches 122. The three drive branches 121 output different voltages to the output terminal 13 through the output branches 122 (determined by the on / off state of the drive branches 121 in the multiple drive modules 12). Therefore, this embodiment can achieve three-phase power supply. In some preferred embodiments, the drive module 12 includes three drive branches 121, and the output terminal 13 can be configured to output three-phase AC power, for example, by using a control circuit 14 to enable the drive branches 121 to perform inverter output.

[0050] In other embodiments, the on / off state of each drive branch 121 and the corresponding output branch 122 in a drive module 12 can be controlled individually. For example, a drive module 12 including three drive branches 121 can disconnect one of the drive branches 121 (the first switch 123 and the second switch 124 on the drive branch 121 are both disconnected), and can output two-phase power, which can further improve the range of electric devices 3 that the electric device drive system 1 can adapt to.

[0051] Preferred, such as Figure 3 As shown, in the electric drive system 1, the number of drive branches 121 in the multiple drive modules 12 is equal; for example, each drive module 12 includes three drive branches 121. Furthermore, the output terminal 13 can be configured to include three output lines, and the three power supply terminal circuits 121 are connected to the three output lines through corresponding output branches 122.

[0052] like Figure 2 As shown, according to a preferred embodiment of the present invention, the drive branch 121 includes a first switch 123 and a second switch 124. In some specific embodiments, the first switch 123 and the second switch 124 may include power switching transistors. In the same drive branch 121, the first switch 123 and the second switch 124 are connected in series, and the connection position of the output branch 122 and the drive branch 121 is located between the first switch 123 and the second switch 124.

[0053] by Figure 2 The leftmost drive branch 121 in the drive module 12 shown is used as an example for explanation; the other drive branches 121 are explained similarly. (Settings) Figure 2 The upper part is at a high level relative to the lower part, and the lower part is at a low level (the potential is defined as 0). In the leftmost drive branch 121, when the first switch 123 is on and the second switch 124 is off, the output branch 122 corresponding to the drive branch 121 is connected to a high level and outputs the voltage corresponding to the high level to the output terminal 13; when the first switch 123 is off and the second switch 124 is on, the output branch 122 corresponding to the drive branch 121 is connected to a low level and outputs the voltage corresponding to the low level to the output terminal 13; when both the first switch 123 and the second switch 124 are off, the drive branch 121 is open circuit.

[0054] According to a specific embodiment of the present invention, the circuit of the driving module 12 is as follows: Figure 2 As shown, the first switch 123 and the second switch 124 can be configured not to be connected simultaneously to prevent an equivalent short circuit. For example, the connection and disconnection states of the first switch 123 and the second switch 124 can be pre-set in certain combinations, excluding combinations where both the first switch 123 and the second switch 124 are connected. Preferably, in some embodiments of the present invention, the electric device drive system 1 includes a control circuit 14, wherein the on / off states of the first switch 123 and the second switch 124 can be controlled separately by the control circuit 14, or control logic can be pre-set to control the on / off states of the first switch 123 and the second switch 124 in multiple drive modules 12. For example, different output modes of multiple drive modules 12 can be pre-set, and each output mode has a corresponding on / off state of the first switch 123 and the second switch 124, which will be described in detail in subsequent embodiments.

[0055] In some embodiments, such as Figure 2 As shown, the drive module 12 can also be configured to include a capacitor 126. The capacitor 126 can be connected in parallel with multiple drive branches 121. When the first switch 123 and the second switch 124 are not simultaneously connected, the equivalent impedance of the capacitor 126 can be used as the equivalent impedance of the drive module 12. In practical applications, the capacitor 126 has leakage current and can be regarded as a resistor with a large resistance value, for example... Figure 2 In the middle, resistor 127 represents the equivalent impedance of capacitor 126. In some other embodiments, the drive module 12 may also have resistor 127 set separately, with resistor 127 and capacitor 126 connected in parallel, capacitor 126 considered as an open circuit, and the resistance value of resistor 127 serving as the equivalent impedance of drive module 12.

[0056] like Figure 2 As shown, in some embodiments of the present invention, the third switch 125 includes a bidirectional switching transistor. In this embodiment, the capacitor 126 and the drive branch 121 are connected in parallel, and the capacitor 126 can recover the kinetic energy of the electric device 3. For example, when the motor in the electric device is in a braking state, the capacitor 126 is charged, and a portion of the kinetic energy during the braking process is stored in the capacitor 126, thus recovering the kinetic energy.

[0057] In this embodiment, the three drive branches 121 in the drive module 12 are connected in parallel. The first switch 123 and the second switch 124 in the different drive branches 121 are independently controlled. The three drive branches 121 do not affect each other and can output different voltage values ​​to the output terminal 13. A preset voltage, such as 380V, is formed between the three branches 124 and output to the electric device 3 through the output terminal 13.

[0058] In a preferred embodiment of the present invention, such as Figure 2 As shown, a third switch 125 is provided on branch 124. The on / off state of the third switch 125 is controlled independently of the on / off states of the first switch 123 and the second switch 124, and can be determined by the controller according to independent control logic. In this embodiment, the on / off state of branch 124 can be controlled by the third switch 125. For example, if at least one of the first switch 123 and the second switch 124 is connected, the third switch 125 is disconnected, and the drive branch 121 and the output terminal 13 are also disconnected. This embodiment provides greater control freedom for the drive module 12, enabling the electrical connection between the drive branch 121 and the output terminal 13 to be cut off even when the drive branch 121 is not disconnected, which is beneficial for safety control.

[0059] Figures 4A-4C This paper illustrates specific examples of two drive modules 12 outputting different voltages according to some embodiments of the present invention, which are described below in conjunction with... Figures 4A-4C Please provide an explanation.

[0060] Two drive modules 12 are connected in series, denoted as 12-1 and 12-2 respectively. The voltages across the upper and lower terminals of drive module 12-1 are V1 and V2, respectively, and the voltages across the upper and lower terminals of drive module 12-2 are V2 and V3, respectively. When the first switch 123 and the third switch 125 of drive module 12-1 are connected, and the second switch 124 is open, the current direction is as follows: Figure 4A As shown by the dashed line, the voltage at output terminal 13 is V1. When the drive module 12 includes multiple drive branches 121, the other drive branches 121 can be controlled independently, and the multiple drive branches 121 do not affect each other.

[0061] When the first switch 123 of the drive module 12-1 is open, and the second switch 124 and the third switch 125 are connected (the first switch 123, the second switch 124, and the third switch 125 in the drive module 12-2 can be set to all be open), such as Figure 4B As shown by the dashed line in the upper half, the voltage at output terminal 13 is V2. Alternatively, when the first switch 123 and the third switch 125 of the drive module 12-2 are connected, and the second switch 124 is open (the first switch 123, the second switch 124, and the third switch 125 in the drive module 12-1 can be set to all be open), the current direction is as follows. Figure 4B As shown by the dashed line in the lower half of the diagram, the voltage at output terminal 13 is V2. This embodiment provides two control methods to make the voltage output at output terminal 13 V2, improving the flexibility of the electric drive system 1.

[0062] When the first switch 123 of the drive module 12-2 is open, and the second switch 124 and the third switch 125 are connected, the current direction is as follows: Figure 4C As shown by the dashed line, the voltage at output terminal 13 is V3.

[0063] According to some embodiments of the present invention, the electric drive system 1 includes three or more drive modules 12, and its control method is similar to... Figures 4A-4C The embodiments shown are basically the same. Specifically, for example, the electric drive system 1 includes three drive modules 12, and two adjacent drive modules 12 can be configured individually. Figures 4A-4C The embodiment shown is used for control, and the voltage output by the two drive modules 12 can be simplified to one drive module 12, and then controlled according to the other of the three drive modules 12. Figures 4A-4C The illustrated embodiment is controlled in the same way. The same applies to embodiments with a larger number of drive modules 12.

[0064] According to a preferred embodiment of the present invention, the input of the drive branch 121 is a DC circuit. In some embodiments, a control circuit can be used to enable the drive branch 121 to perform inverter output, which, through the output terminal 13, can output AC power to the electric device 3. In this embodiment, the drive branch 121 is set as a DC circuit, which is beneficial for simplifying circuit design and maintaining a stable voltage. When the electric device 3 includes an AC motor, the control circuit can be used to enable the output terminal 13 to output AC power to the electric device 3.

[0065] In different embodiments, the electric device drive system 1 of the present invention has a wide range of applications and does not limit the power grid 2. The power grid 2 can be a DC power grid or an AC power grid, depending on the actual application scenario of the electric device drive system 1. For example, if the power grid 2 is a DC power grid, it can be directly connected to the drive branch 121. In this embodiment, different voltage DC power grids can be adapted by setting different numbers of drive modules 12.

[0066] Alternatively, in other embodiments, the power grid 2 is an AC power grid, and the input terminal 11 can be configured to output DC power. For example, the input terminal 11 includes a rectifier for converting AC power into DC power and then outputting DC power to the drive module 12 so as to cooperate with the drive module 12.

[0067] According to a preferred embodiment of the present invention, a plurality of drive modules 12 are connected in series at the input terminal 11, and the voltage of the power grid 2 is evenly distributed to the plurality of drive modules 12, for example... Figures 4A-4C In this configuration, V3 can be set to 0, and V1 is equal to twice V2. Multiple drive modules 12 can be configured to have essentially the same structural dimensions and electrical parameters, which facilitates standardization of the drive modules 12 and reduces their production costs. In practical applications, an appropriate number of drive modules 12 are selected based on the power grid 2 and the electric device 3. Furthermore, each drive module 12 can be individually packaged, simplifying the connection process between multiple drive modules 12, for example, by providing interlocking interfaces on the package structure of the drive module 12.

[0068] In other embodiments, the voltage of the power grid 2 can also be distributed to multiple drive modules 12 according to the equivalent impedance of each drive module 12. In this embodiment, the equivalent impedances of the multiple drive modules 12 are not equal, the voltages of the multiple drive modules 12 are not equal, and the combination of the multiple drive modules 12 is more flexible. In a preferred embodiment, the drive modules 12 can be configured with a variety of different specifications, and the appropriate number of drive modules 12 and the specifications of each drive module 12 can be selected according to the power grid 2 and the electric device 3.

[0069] like Figure 1As shown, according to a preferred embodiment of the present invention, the electric drive system 1 further includes a control circuit 14, which is signal-connected to the drive module 12, and the control circuit 14 is configured to control the on / off state of the drive branch 121 and the output branch 122. For example, the control circuit 14 controls the first switch 123, the second switch 124 and the third switch 125 to be connected or disconnected.

[0070] In some preferred embodiments, the first switch 123, the second switch 124, and the third switch 125 in multiple drive modules 12 can be pre-combined to connect or disconnect, and preset to different output modes to reduce the difficulty of user control. For example Figures 4A-4C As shown, when two drive modules 12 are connected in series, the output terminal 13 can output three different voltage values ​​(V1, V2, V3). In some embodiments of the present invention, three different output modes can be preset, each output mode having a corresponding on / off state of the first switch 123 and the second switch 124. In this embodiment, control logic can be preset to cover the on / off states of the first switch 123 and the second switch 124 corresponding to the three different output modes. The control circuit 14 changes the on / off state of each first switch 123 and the second switch 124 in the two drive modules 12 according to the preset control logic, thereby changing the output mode. In some embodiments, when the voltage of the output terminal 13 is V2, corresponding to two on / off states of the first switch 123 and the second switch 124, one of the on / off states of the first switch 123 and the second switch 124 can be used as a redundant backup.

[0071] In other embodiments, the electric drive system 1 may also include safety circuits, etc., and further, the electric drive system 1 may be integrated into one unit.

[0072] The present invention also relates to an assembly method for an electric actuator drive system. Figure 5 The following illustrates a flowchart of an assembly method 100 for an electric actuator drive system according to some embodiments of the present invention, used for assembling the electric actuator drive system 1 as described in the foregoing embodiments. Figure 5 The assembly method 100 for the electric actuator drive system is described.

[0073] In step S101, the output parameters of the power grid are obtained, including the voltage of the power grid. In other embodiments, the output parameters of the power grid may also include whether the power grid is a DC power grid or an AC power grid. Obtaining the output voltage of the power grid can be used to determine a minimum number of drive modules, for example, to prevent the first or second switch in the drive module from being damaged.

[0074] In step S102, at least one operating voltage of the electric device is obtained. In some embodiments, the electric device drive system needs to be matched with different electric devices or needs to adapt to different operating states of the electric devices; therefore, in this embodiment, the electric device has at least one operating voltage. The operating voltage of the electric device can be determined according to the actual application.

[0075] In step S103, the combination method of the multiple drive modules is determined based on the output parameters of the power grid and at least one operating voltage of the electric device. In this embodiment, the electric device drive system includes multiple drive modules, and the combination method of the multiple drive modules includes the number of drive modules and the voltage allocated by the power grid to each drive module.

[0076] The voltages from multiple power grids are distributed to multiple drive modules, and the voltages distributed to each drive module can be equal or unequal. Drive branches in the multiple drive modules are connected or disconnected to output different voltages; preferably, the different voltages output by the multiple drive modules include all the operating voltages of the electric actuator.

[0077] In some embodiments of the present invention, the combination of multiple driving modules is not limited to one type, and multiple combination methods can be selected. For example, the combination of multiple driving modules can be preferentially selected by using the reduction of the number of driving modules as a screening condition.

[0078] In step S104, input and output terminals are provided. In step S105, multiple driver modules are cascaded at the input terminal, and all driver modules are connected to the output terminal. The input and output terminals can either have separate interfaces or be integrated into the circuitry of the driver modules.

[0079] Finally, it should be noted that the above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electric device driving system arranged between a power grid and an electric device, the electric device driving system comprising: an input end electrically connected to the power grid and configured to draw power from the power grid; a plurality of driving modules cascaded on the input end, a voltage of the power grid being distributed to the plurality of driving modules; and an output end to which the plurality of driving modules are connected, the output end being configured to supply power to the electric device; wherein each of the driving modules comprises a driving branch, and the plurality of driving modules are configured to independently control the on-off state of the driving branch in each driving module, so that the plurality of driving modules output different voltages to the output end.

2. The electric device driving system of claim 1, wherein each of the driving modules comprises a plurality of driving branches and a plurality of output branches, the plurality of driving branches being connected in parallel to the input end, and each of the driving branches being connected to the output end through one of the output branches.

3. The electric device driving system of claim 2, wherein each of the driving branches comprises a first switch and a second switch connected in series to the driving branch, and the connection position of the output branch and the driving branch is located between the first switch and the second switch.

4. The electric device driving system of claim 3, wherein a third switch is arranged on the output branch, and the on-off state of the third switch is controlled independently of the on-off state of the first switch and the second switch.

5. The electric device driving system of claim 4, wherein each of the driving modules comprises a capacitor, and the third switch comprises a bidirectional switch tube; the capacitor is connected in parallel to the driving branch and configured to recover kinetic energy of the electric device.

6. The electric device driving system of claim 2, wherein each of the driving modules comprises three driving branches, and the output end is configured to output three-phase alternating current.

7. The electric device driving system of claim 1, wherein the input of each of the driving branches is a direct current circuit, and the output end is converted to output alternating current.

8. The electric device driving system of claim 7, wherein the power grid outputs direct current to the electric device driving system; or the input end is configured to output direct current to the driving modules.

9. The electric device driving system of any one of claims 1-8, wherein the plurality of driving modules are connected in series on the input end, and the voltage of the power grid is uniformly distributed to the plurality of driving modules, or the voltage of the power grid is distributed to the plurality of driving modules according to the equivalent impedance of each of the driving modules.

10. The electric device driving system of any one of claims 2-8, further comprising a control circuit connected to the driving modules and configured to control the on-off state of the driving branches and the output branches.

11. An assembly method of an electric device driving system, for assembling the electric device driving system of any one of claims 1-10, the assembly method comprising: ​ obtaining an output parameter of the power grid; obtaining at least one operating voltage of the electric device; determining a combination of a plurality of drive modules according to the output parameter of the power grid and the at least one operating voltage of the electric device; providing an input end and an output end; cascading the plurality of drive modules at the input end; wherein the output parameter of the power grid comprises a voltage of the power grid, the combination of the plurality of drive modules comprises a number of the drive modules, and the voltage of the power grid is distributed to each of the drive modules.

12. The assembling method of claim 11, wherein in the step of determining the combination of the plurality of drive modules, the plurality of drive modules are configured to be capable of outputting different voltages, and the voltages outputted by the plurality of drive modules comprise the at least one operating voltage of the electric device.

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