Drive circuit and vibration reduction system

Abstract

This invention relates to a drive circuit and a vibration reduction system. [Solution] The drive circuit includes a plurality of drive branch circuits. The input terminals of the plurality of drive branch circuits each receive a control signal, and the output terminals of the plurality of drive branch circuits are connected to a plurality of target devices for outputting force, and the plurality of drive branch circuits include at least one first drive branch circuit. Here, the first drive branch circuit is configured to control the corresponding target device to a first output state when the received control signal satisfies a first predetermined condition, and to control the corresponding target device to a second output state when the received control signal satisfies a second predetermined condition, wherein the force output by the target device under the first output state is smaller than the force output under the second output state. This enables the drive circuit to independently control the output of a single motor, the drive circuit is suitable for wide-range and high-precision output control scenarios, and the vibration control performance of the drive circuit is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor drive control, and specifically, to a drive circuit and a vibration reduction system.

Background Art

[0002] As the precision of ultra-precision machining equipment and measuring instruments improves, there are more stringent requirements for micro-amplitude and low-frequency vibrations in their operating environments. As a result, more stringent requirements are also placed on the vibration reduction performance of vibration isolation platforms. Conventional passive vibration isolation technologies consist of mass-spring-damper systems, which have an inherent contradiction between low-frequency vibration transmission rates and high-frequency vibration attenuation rates, and thus cannot meet the vibration reduction needs of ultra-precision instruments. Therefore, in order to improve this situation, some new technologies and new methods are eagerly desired.

[0003] Active vibration reduction is an important technology for solving the above problems. An active vibration reduction system usually adopts motor drive, piezoelectric drive, hydraulic drive and / or pneumatic drive to provide a counteracting force against ground vibration and table surface vibration, thereby realizing its active vibration reduction function.

[0004] However, the above active vibration reduction (vibration isolation) system has a problem that it is difficult to achieve both wide-range output and high-precision output, and its application scenarios are limited.

Summary of the Invention

[0005] The object of the present invention is to provide a drive circuit and a vibration reduction system to solve the problem that it is difficult for an active vibration reduction system to simultaneously meet wide-range output and high-precision output, and to expand its application scenarios.

[0006] In embodiments of the present invention, a drive circuit is provided. This drive circuit includes a plurality of drive branch circuits, each having an input terminal that receives a control signal, and each having an output terminal that corresponds to a plurality of target devices for outputting force, the plurality of drive branch circuits including at least one first drive branch circuit, the first drive branch circuit is configured to control the corresponding target device to a first output state when the received control signal satisfies a first predetermined condition, and to control the corresponding target device to a second output state when the received control signal satisfies a second predetermined condition, the target device corresponding to the first drive branch circuit having a force output in the first output state that is smaller than the force output in the second output state.

[0007] Here, the multiple drive branch circuits further include at least one second drive branch circuit. The second drive branch circuit is configured to respond to the received control signal and control the corresponding target device to a third output state, wherein the force output by the target device corresponding to the second drive branch circuit in the third output state is greater than the force output by the target device corresponding to the first drive branch circuit in the second output state.

[0008] Here, when the first drive branch circuit controls the corresponding target device to the first output state, it specifically controls the corresponding target device to stop outputting force, thereby achieving control of the corresponding target device to the first output state.

[0009] Here, the first drive branch circuit includes a signal conversion circuit and a first driver, the signal conversion circuit receives a control signal and is connected to the first driver, the first driver is connected to a corresponding target device, the signal conversion circuit is configured to attenuate the received control signal using a first attenuation method to obtain a first attenuated control signal and transmit the first attenuated control signal to the first driver if the received control signal satisfies a first predetermined condition, and to attenuate the received control signal using a second attenuation method to obtain a second attenuated control signal and transmit the second attenuated control signal to the first driver, the first driver is configured to respond to the received first attenuated control signal and control the corresponding target device to a first output state such that the magnitude of the force output by the corresponding target device in the first output state is proportional to the signal strength of the first attenuated control signal, and to respond to the received second attenuated control signal and control the corresponding target device to a second output state such that the magnitude of the force output by the corresponding target device in the second output state is proportional to the signal strength of the second attenuated control signal.

[0010] Here, the control signal is a control voltage signal, and the signal conversion circuit is configured to convert the received control voltage signal to zero voltage when the received control voltage signal is greater than a predetermined negative voltage and less than a predetermined positive voltage, and transmit the zero voltage as a first attenuated control signal to the first driver, and when the received control voltage signal is less than or equal to a predetermined negative voltage or greater than or equal to a predetermined positive voltage, attenuate the control voltage signal by a predetermined amount to obtain a second attenuated control signal, and transmit the second attenuated control signal to the first driver, and the first driver is configured to respond to the received zero voltage and control the corresponding target device to stop the output of force, thereby controlling the corresponding target device to a first output state, and respond to the received second attenuated control signal and control the corresponding target device to output force according to the second attenuated control signal, thereby controlling the corresponding target device to a second output state.

[0011] Here, the signal conversion circuit, when the received control voltage signal is below a predetermined negative voltage or above a predetermined positive voltage, attenuates the control voltage signal by a predetermined amount to obtain a second attenuated control signal and transmits the second attenuated control signal to the first driver. Specifically, when the received control voltage signal is below a predetermined negative voltage, it subtracts a predetermined negative voltage from the control voltage signal to obtain a second attenuated control signal and transmits the second attenuated control signal to the first driver. When the received control voltage signal is above a predetermined positive voltage, it subtracts a predetermined positive voltage from the control voltage signal to obtain a second attenuated control signal and transmits the second attenuated control signal to the first driver.

[0012] Here, the signal conversion circuit includes a first arithmetic unit, a first comparator, a first analog switch, a second arithmetic unit, a second comparator, a second analog switch, and a third arithmetic unit, wherein the first arithmetic unit and the first comparator are both connected to the first analog switch, the second arithmetic unit and the second comparator are both connected to the second analog switch, the first analog switch and the second analog switch are both connected to the third arithmetic unit, and the third arithmetic unit is connected to the first driver, wherein the first arithmetic unit receives a control voltage signal and a predetermined positive voltage, respectively. Both are configured to subtract a predetermined positive voltage from the control voltage signal and transmit it to the first input terminal of the first analog switch, and the first comparator receives the control voltage signal and the predetermined positive voltage respectively, and if the control voltage signal is greater than the predetermined positive voltage, it transmits a first conduction signal to the first analog switch, and if the control voltage signal is less than or equal to the predetermined positive voltage, it transmits a first cutoff signal to the first analog switch, and the first analog switch receives the received first conduction signal and controls the conduction between the first input terminal and the output terminal of the first analog switch, thereby transmitting the control voltage signal after subtracting the predetermined positive voltage to the input terminal of the third arithmetic unit, and in response to the received first cutoff signal, it controls the cutoff between the first input terminal and the output terminal of the first analog switch, and the second arithmetic unit receives the control voltage signal and the predetermined negative voltage respectively, and transmits it to the first input terminal of the second analog switch after subtracting a predetermined negative voltage from the control voltage signal, and the second comparator receives the control voltage signal and the predetermined negative voltage respectively, and if the control voltage signal is less than the predetermined negative voltage The system is configured to transmit a second conduction signal to the second analog switch, and if the control voltage signal is greater than or equal to a predetermined negative voltage, transmit a second cutoff signal to the second analog switch. The second analog switch responds to the received second conduction signal by controlling the conduction between the first input terminal and the output terminal of the second analog switch, thereby transmitting the control voltage signal after subtracting the predetermined negative voltage to the input terminal of the third arithmetic unit. The system is configured to respond to the received second cutoff signal by controlling the cutoff between the first input terminal and the output terminal of the second analog switch. The third arithmetic unit,It is configured to add the voltage signal at the input terminal before sending it to the first driver.

[0013] Here, the signal conversion circuit further includes a controllable switch, the control terminal of the controllable switch is connected to the output terminal of a first comparator, the controllable switch is connected to a first analog switch, the controllable switch is configured to transmit a first conduction signal to the first analog switch when conducting, and to transmit a first disconnection signal to the first analog switch when disconnecting, the first comparator is configured to transmit a first conduction signal to the first analog switch by controlling the controllable switch to conduct when the control voltage signal is greater than a predetermined positive voltage, and to transmit a first disconnection signal to the first analog switch by controlling the controllable switch to disconnect when the control voltage signal is less than or equal to a predetermined positive voltage.

[0014] Here, the signal conversion circuit further includes a first buffer, a second buffer, and a third buffer, the first buffer being connected between the first analog switch and the third arithmetic unit, the second buffer being connected between the second analog switch and the third arithmetic unit, and the third buffer being connected between the third arithmetic unit and the first driver.

[0015] Embodiments of the present invention further provide a vibration reduction system, which includes any one of the drive circuits described above.

[0016] The beneficial effects of the present invention are as follows: The present invention provides a drive circuit and a vibration reduction system. The drive circuit can be applied to the vibration reduction system and includes a plurality of drive branch circuits. The input terminals of the plurality of drive branch circuits each receive a control signal. The output terminals of the plurality of drive branch circuits are connected to a plurality of target devices for outputting force. The plurality of drive branch circuits also include at least one first drive branch circuit. Here, the first drive branch circuit is configured to control the corresponding target device to a first output state when the received control signal satisfies a first predetermined condition, and to control the corresponding target device to a second output state when the received control signal satisfies a second predetermined condition. The force output by the target device corresponding to the first drive branch circuit under the first output state is less than the force output under the second output state. As a result, in the process of driving a target device (e.g., a motor) and outputting a desired force by controlling the drive circuit with a control signal, the drive circuit can independently control the output of a single target device. Therefore, the drive circuit is suitable for control scenarios that require a wide range of output and high-precision output, improving the control performance of the drive circuit, broadening the application scenarios of the product, and improving the applicability of the product. [Brief explanation of the drawing]

[0017] The following detailed description of specific embodiments of the present invention, with reference to the drawings, will further clarify the technical means and other beneficial effects of the present invention.

[0018] [Figure 1] This is a schematic diagram of the drive circuit provided by the related technology. [Figure 2] This is a schematic diagram illustrating the relationship between the force output by all target devices driven by the drive circuit in the related technology and the control signal. [Figure 3] This is a schematic diagram of the structure of a drive circuit provided in an embodiment of the present invention. [Figure 4] This is a schematic diagram comparing the signal strength before and after control signal attenuation provided in an embodiment of the present invention. [Figure 5]It is a schematic diagram showing the relationship between the overall output force of all target devices driven by the drive circuit provided in the embodiment of the present invention and the control signal. [Figure 6] It is another schematic structural diagram of the drive circuit provided in the embodiment of the present invention. [Figure 7] It is another schematic structural diagram of the drive circuit provided in the embodiment of the present invention. [Figure 8] It is another schematic structural diagram of the drive circuit provided in the embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0019] Hereinafter, while referring to the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present invention.

[0020] In this specification, terms indicating orientation or positional relationship such as "center", "vertical direction", "horizontal direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of explanation and simplification of the description of the present invention, and do not indicate or imply that the shown device or element must have a specific orientation and be configured and operated in a specific orientation, so it should not be understood as a limitation to the present invention. Also, the terms "first" and "second" are only for the purpose of explanation and should not be understood as indicating or implying relative importance or implicitly indicating the number of the shown technical features. Thus, the features limited to "first" and "second" can explicitly or implicitly include one or more of the above features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically limited.

[0021] In the description of the present invention, unless otherwise clearly defined or limited, the terms "attach", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, removably connected, integrally connected, mechanically connected, electrically connected, or communicate with each other. It may be directly connected or indirectly connected through an intermediate medium, or it may be the internal communication between two elements or the interaction relationship between two elements. It should be noted that those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

[0022] In the present invention, unless otherwise clearly defined or limited, the fact that the first feature is "above" or "below" the second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact and contact through another feature therebetween. Further, the fact that the first feature is "above", "upward" and "upper surface" of the second feature only indicates that the first feature is directly above and obliquely above the second feature, or the horizontal height of the first feature is higher than that of the second feature. The fact that the first feature is "below", "downward" and "lower surface" of the second feature only indicates that the first feature is directly below and obliquely below the second feature, or the horizontal height of the first feature is smaller than that of the second feature.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. Hereinafter, for the purpose of simplifying the disclosure of the present invention, the configuration and arrangement of specific examples will be described. Of course, these are merely examples and do not limit the present invention. Also, the present invention may repeat reference numerals and / or reference alphabets in different examples, and such repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. Furthermore, the present invention provides examples of various specific processes and materials, but those skilled in the art can recognize the application of other processes and / or the use of other materials.

[0024] Figure 1 is a schematic diagram of the structure of a drive circuit provided in the related technology. As shown in Figure 1, the drive circuit in the related technology includes multiple drivers (e.g., driver A and driver B). Each of the multiple drivers receives a control signal VIN. Each driver in the multiple drivers is connected to one target device. For example, driver A and driver B are connected to target device A and target device B, respectively. Each driver responds to the received control signal VIN and drives the corresponding target device according to the control signal VIN, outputting a force. The magnitude of the force F output by all target devices driven by the drive circuit is linearly proportional to the signal strength of the control signal VIN (Figure 2).

[0025] However, in the related technology, each driver included in the drive circuit receives a control signal VIN synchronously, drives its corresponding target device synchronously to output force, and the force output by each target device is the same. Therefore, the drive circuit in the related technology can only control the overall output of all target devices and cannot independently control the output of a single target device. As a result, the drive circuit in the related technology is not suitable for control scenarios that require both wide-range and high-precision output simultaneously, and its application scenarios are limited.

[0026] To address the above problems, embodiments of the present invention provide a drive circuit and a vibration reduction system. The drive circuit can be applied to a vibration reduction system and includes a plurality of drive branch circuits. The input terminals of the plurality of drive branch circuits each receive a control signal. The output terminals of the plurality of drive branch circuits are connected to a plurality of target devices for outputting force. The plurality of drive branch circuits also include at least one first drive branch circuit. Here, the first drive branch circuit is configured to control the corresponding target device to a first output state when the received control signal satisfies a first predetermined condition, and to control the corresponding target device to a second output state when the received control signal satisfies a second predetermined condition. The force output by the target device corresponding to the first drive branch circuit under the first output state is smaller than the force output under the second output state. As a result, in the process of driving a target device (e.g., a motor) and outputting a desired force by controlling the drive circuit with a control signal, the drive circuit can independently control the output of a single target device. Therefore, the drive circuit is suitable for control scenarios requiring a wide range of output and high-precision output, improving the control performance of the drive circuit, broadening the application scenarios of the product, and improving the applicability of the product.

[0027] The following will provide a detailed explanation using specific examples. Note that the numbers in the following examples do not limit the preferred order of the examples.

[0028] Figure 3 is a schematic diagram of the structure of a drive circuit provided in an embodiment of the present invention. As shown in Figure 3, the drive circuit 10 includes a plurality of drive branch circuits 100 / 200. The input terminals of the plurality of drive branch circuits 100 / 200 each receive a control signal VIN, and the output terminals of the plurality of drive branch circuits 100 / 200 are connected to a plurality of target devices 20A / 20B for outputting force. Specifically, each drive branch circuit 100 / 200 may be connected to one target device 20A / 20B. Different drive branch circuits 100 / 200 may be connected to different target devices 20A / 20B. Each drive branch circuit 100 / 200 is arranged to drive its corresponding target device 20A / 20B to output force, where the target device 20A / 20B is specifically a motor (e.g., a linear motor) or another device having the same or similar function.

[0029] Specifically, the plurality of drive branch circuits 100 / 200 may include at least one first drive branch circuit 100. The first drive branch circuit 100 is connected to the corresponding target device 20A. The first drive branch circuit 100 is configured to control the corresponding target device 20A to a first output state when the received control signal VIN satisfies a first predetermined condition, and to control the corresponding target device 20A to a second output state when the received control signal VIN satisfies a second predetermined condition. The force output by the target device 20A corresponding to the first drive branch circuit 100 in the first output state is smaller than the force output in the second output state.

[0030] Here, the control signal VIN is used to control the overall output magnitude of all target devices 20A / 20B driven by the control drive circuit 10. Specifically, if the control signal VIN satisfies a first predetermined condition, the control signal VIN can control the overall output magnitude within a first range, and if the control signal VIN satisfies a second predetermined condition, the control signal VIN can control the overall output magnitude within a second range. The first range and the second range are different. Specifically, the first range is smaller than the second range.

[0031] Thus, when the multiple drive branch circuits 100 / 200 synchronously receive the same control signal VIN, the first drive branch circuit 100 in the multiple drive branch circuits 100 / 200 is configured to automatically switch the output state of the corresponding target device 20A according to the actual situation of the control signal VIN and output different forces. This enables the drive circuit 10 to independently control the output of the target device 20A corresponding to the first drive branch circuit 100, improving the control performance of the drive circuit 10, allowing the drive circuit 10 to simultaneously suit control scenes for wide-range output and high-precision output, and broadening the range of application scenarios.

[0032] In the drive circuit 10, the number of first drive branch circuits 100 may be less than or equal to the total number of drive branch circuits 100 / 200. That is, all of the multiple drive branch circuits 100 / 200 may be first drive branch circuits 100, or only some of them may be first drive branch circuits 100.

[0033] In some embodiments, as shown in Figure 3, the plurality of drive branch circuits 100 / 200 may consist of only a portion of the first drive branch circuit 100. Specifically, the plurality of drive branch circuits 100 / 200 may further include at least one second drive branch circuit 200. The second drive branch circuit 200 is connected to its corresponding target device 20B. The second drive branch circuit 200 may be configured to respond to a received control signal VIN and control the corresponding target device 20B to a third output state. Furthermore, the force output by the target device 20B corresponding to the second drive branch circuit 200 in the third output state may be greater than the force output by the target device 20A corresponding to the first drive branch circuit 100 in the second output state.

[0034] Specifically, the second drive branch circuit 200 is configured to respond to the received control signal VIN and control the corresponding target device 20B to a third output state according to the control signal VIN. Furthermore, the magnitude of the force output by the target device 20B corresponding to the second drive branch circuit 200 in the third output state may be proportional to the signal strength of the control signal VIN, for example, specifically, a linear proportional relationship. Thus, since the second drive branch circuit 200 including the second driver 201 can be provided by a drive branch circuit including driver A or driver B in a conventional drive circuit (Figure 1), the drive circuit 10 according to an embodiment of the present invention can be obtained by converting some of the drive branch circuits in the conventional drive circuit to the first drive branch circuit, which is advantageous in reducing product costs.

[0035] In some embodiments, as shown in Figure 3, only a portion of the plurality of drive branch circuits 100 / 200 may be the first drive branch circuit 100. The first drive branch circuit 100 controls the corresponding target device 20A to the first output state by specifically controlling the corresponding target device 20A to stop outputting force. In this way, the target device 20A corresponding to the first drive branch circuit 100 outputs force only when the control signal VIN satisfies a second predetermined condition, and does not output force when the control signal VIN satisfies a first predetermined condition. This improves the output accuracy when all target devices 20A / 20B driven by the drive circuit 10 output a small force overall.

[0036] In some embodiments, as shown in Figure 3, the first drive branch circuit 100 may include a signal conversion circuit 101 and a first driver 102. Here, the signal conversion circuit 101 receives a control signal VIN. The signal conversion circuit 101 is connected to the first driver 102. The first driver 102 is connected to its corresponding target device 20A.

[0037] The signal conversion circuit 101 can be arranged as shown below. If the received control signal VIN satisfies the first predetermined condition, the control signal VIN is attenuated using the first attenuation method, the first attenuated control signal VOUT1 is obtained, and the first attenuated control signal VOUT1 is transmitted to the first driver 102. If the received control signal VIN satisfies the second predetermined condition, the control signal VIN is attenuated using the second attenuation method, the second attenuated control signal VOUT2 is obtained, and the second attenuated control signal VOUT2 is transmitted to the first driver 102.

[0038] The first driver 102 may be arranged as follows. In response to the received first attenuated control signal VOUT1, the corresponding target device 20A is controlled to the first output state. The system controls the corresponding target device 20A to the second output state according to the received second attenuated control signal VOUT2.

[0039] Specifically, attenuating the control signal VIN using the first attenuation method may involve attenuating the signal strength of the control signal VIN to zero, or attenuating the signal strength of the control signal VIN by a first percentage. Attenuating the control signal VIN using the second attenuation method may involve attenuating the signal strength of the control signal VIN by a second percentage (where the second percentage may be smaller than the first percentage), or attenuating the signal strength of the control signal VIN by a predetermined amount of attenuation.

[0040] Specifically, the magnitude of the force output by the target device 20A corresponding to the first driver 102 under the first output state may be proportional to the signal strength of the first attenuated control signal VOUT1, for example, a linear proportional relationship. The magnitude of the force output by the target device 20A corresponding to the first driver 102 under the second output state may be proportional to the signal strength of the second attenuated control signal VOUT2, for example, a linear proportional relationship.

[0041] Thus, by incorporating a signal conversion circuit 101 into the first drive branch circuit 100 and transmitting the received control signal VIN to the first driver 102 after attenuating it with the signal conversion circuit 101, the drive circuit 10 not only reduces the force output by the target device 20A corresponding to the first drive branch circuit 100 when the control signal VIN satisfies a first predetermined condition, but also reduces the force output by the target device 20A corresponding to the first drive branch circuit 100 when the control signal VIN satisfies a second predetermined condition. As a result, the output accuracy is improved when all target devices 20A / 20B driven by the drive circuit 10 output a small force overall, and the output accuracy is also improved when all target devices 20A / 20B driven by the drive circuit 10 output a large force overall.

[0042] In some specific embodiments, as shown in Figure 3, the control signal VIN may specifically be a control voltage signal VIN. When the control voltage signal VIN is higher than a predetermined negative voltage and lower than a predetermined positive voltage, it is considered that the control voltage signal VIN satisfies the first predetermined condition. When the control voltage signal VIN is less than or equal to a predetermined negative voltage or greater than or equal to a predetermined positive voltage, it is considered that the control voltage signal VIN satisfies the second predetermined condition. Here, the control voltage signal VIN may be between a predetermined low voltage and a predetermined high voltage. Here, both the predetermined low voltage and the predetermined negative voltage are lower than zero voltage (i.e., 0V), and the predetermined low voltage is lower than the predetermined negative voltage, and both the predetermined high voltage and the predetermined positive voltage are higher than zero voltage, and the predetermined high voltage is higher than the predetermined positive voltage. Specifically, the predetermined high voltage may be the same as the absolute value of the predetermined low voltage, and the predetermined positive voltage may be the same as the absolute value of the predetermined negative voltage. Exemplaryly, the predetermined high voltage and predetermined low voltage may be 10V and -10V, respectively. The predetermined positive voltage and predetermined negative voltage may be aV and -aV, respectively. a is greater than 0 and less than 10. The specific value of a can be set according to the user's needs for output accuracy when the product is low output. For example, a may be 1.

[0043] In practical implementation, the signal conversion circuit 101 can be specifically arranged as follows. If the received control voltage signal VIN is higher than a predetermined negative voltage and lower than a predetermined positive voltage, the control voltage signal VIN is converted to a zero voltage, and the zero voltage is transmitted to the first driver 102 as the first attenuated control signal VOUT1. If the received control voltage signal VIN is below a predetermined negative voltage or above a predetermined positive voltage, the control voltage signal VIN is attenuated by a predetermined amount, a second attenuated control signal VOUT2 is obtained, and the second attenuated control signal VOUT2 is transmitted to the first driver 102.

[0044] The first driver 102 may be specifically arranged as follows. In response to the received zero voltage, the corresponding target device 20A is controlled to stop its power output, thereby controlling the corresponding target device 20A to a first output state. In response to the received second attenuated control signal VOUT2, the system controls the corresponding target device 20A to output force according to the second attenuated control signal VOUT2, thereby controlling the corresponding target device 20A to the second output state.

[0045] Specifically, the predetermined attenuation may be greater than zero and less than or equal to the absolute value of the predetermined negative voltage and / or the predetermined positive voltage. In practical implementation, the specific value of the predetermined attenuation can be set according to the user's needs for output accuracy when the product is at high output. The magnitude of the force output by the target device 20A corresponding to the first driver 102 under the second output state may be proportional to the signal strength of the second attenuated control signal VOUT2, for example, in a linear proportional relationship.

[0046] Thus, the drive circuit 10 not only controls the target device 20A corresponding to the first drive branch circuit 100 to stop outputting force when the control voltage signal VIN is greater than a predetermined negative voltage and less than a predetermined positive voltage, but also reduces the force output by the target device 20A corresponding to the first drive branch circuit 100 when the control voltage signal VIN is less than or equal to a predetermined negative voltage or greater than or equal to a predetermined positive voltage. As a result, the output accuracy is improved when all target devices 20A / 20B driven by the drive circuit 10 output a small force overall, and the output accuracy is also improved when all target devices 20A / 20B driven by the drive circuit 10 output a large force overall.

[0047] In some embodiments, when the received control voltage signal VIN is below a predetermined negative voltage or above a predetermined positive voltage, the signal conversion circuit 101 attenuates the control voltage signal VIN by a predetermined amount, obtains a second attenuated control signal VOUT2, and transmits the second attenuated control signal VOUT2 to the first driver 102, specifically, If the received control voltage signal VIN is less than or equal to a predetermined negative voltage, the predetermined negative voltage is subtracted from the control voltage signal VIN to obtain the second attenuated control signal VOUT2, and the second attenuated control signal VOUT2 is transmitted to the first driver 102. If the received control voltage signal VIN is greater than or equal to a predetermined positive voltage, the predetermined positive voltage is subtracted from the control voltage signal VIN to obtain the second attenuated control signal VOUT2, and the second attenuated control signal VOUT2 is transmitted to the first driver 102.

[0048] As shown in Figure 4, the following is achieved: When the control voltage signal VIN is less than or equal to a predetermined negative voltage V2, the control voltage signal VIN is converted to a second attenuated control signal VOUT2 equal to the difference between the control voltage signal VIN and the predetermined negative voltage; when the control voltage signal VIN is greater than or equal to a predetermined positive voltage V1, the control voltage signal VIN is converted to a second attenuated control signal VOUT2 equal to the difference between the control voltage signal VIN and the predetermined positive voltage; and when the control voltage signal VIN is higher than the predetermined negative voltage V2 and lower than the predetermined positive voltage V1, the control voltage signal VIN is converted to a first attenuated control signal VOUT1 equal to zero voltage. Therefore, the continuity of the attenuated signal of the control voltage signal VIN is ensured.

[0049] By arranging the attenuated signal of the control voltage signal VIN into the continuous signal shown in Figure 4, the continuity of the force F output by all target devices 20A / 20B driven by the drive circuit 10 is further realized (Figure 5). This avoids a sudden increase or decrease in the force F output by all target devices 20A / 20B when the control voltage signal VIN is equal to or close to a predetermined positive voltage V1, and also avoids a sudden increase or decrease in the force F output by all target devices 20A / 20B when the control voltage signal VIN is equal to or close to a predetermined negative voltage V2. As a result, the control performance of the drive circuit 10 is further improved, and when used in a vibration reduction system, the vibration reduction performance and stability of the vibration reduction system can be improved.

[0050] In some specific embodiments, as shown in Figure 6, the signal conversion circuit 101 includes a first arithmetic unit 1011, a first comparator 1012, a first analog switch 1013, a second arithmetic unit 1014, a second comparator 1015, a second analog switch 1016, and a third arithmetic unit 1017. Here, both the first arithmetic unit 1011 and the first comparator 1012 are connected to the first analog switch 1013. Both the second arithmetic unit 1014 and the second comparator 1015 are connected to the second analog switch 1016. Both the first analog switch 1013 and the second analog switch 1016 are connected to the third arithmetic unit 1017. The third arithmetic unit 1017 is connected to the first driver 102.

[0051] Specifically, the first arithmetic unit 1011 can receive the control voltage signal VIN and a predetermined positive voltage V1, and may be configured to subtract the predetermined positive voltage V1 from the control voltage signal VIN and then transmit the result to the first input terminal a of the first analog switch 1013. In this way, the voltage at the first input terminal a of the first analog switch 1013 is equal to the difference obtained by subtracting the predetermined positive voltage V1 from the control voltage signal VIN, and is denoted as voltage (VIN-V1).

[0052] The first comparator 1012 can receive a control voltage signal VIN and a predetermined positive voltage V1, and may be configured to transmit a first conduction signal to the first analog switch 1013 when the control voltage signal VIN is greater than the predetermined positive voltage V1, and to transmit a first cutoff signal to the first analog switch 1013 when the control voltage signal VIN is less than or equal to the predetermined positive voltage V1. Here, the first conduction signal may be at a high potential, and the first cutoff signal may be at a low potential.

[0053] The first analog switch 1013 is configured to transmit the voltage (VIN-V1) at the first input terminal a of the first analog switch 1013 to the first input terminal of the third arithmetic unit 1017 by controlling the conduction between the first input terminal a of the first analog switch 1013 and the output terminal c of the first analog switch 1013 in response to a received first conduction signal, and to control the disconnection between the first input terminal a of the first analog switch 1013 and the output terminal c of the first analog switch 1013 in response to a received first disconnection signal.

[0054] This ensures that when the control voltage signal VIN is greater than a predetermined positive voltage V1, the voltage at the input terminal of the third arithmetic unit 1017 is (VIN-V1), and when the control voltage signal VIN is less than or equal to the predetermined positive voltage V1, the transmission of (VIN-V1) to the input terminal of the third arithmetic unit 1017 is avoided.

[0055] Specifically, the second arithmetic unit 1014 may be configured to receive the control voltage signal VIN and a predetermined negative voltage V2, and then subtract the predetermined negative voltage V2 from the control voltage signal VIN before transmitting the result to the first input terminal a of the second analog switch 1016. In this way, the voltage at the first input terminal a of the second analog switch 1016 is equal to the difference obtained by subtracting the predetermined negative voltage V2 from the control voltage signal VIN, and is denoted as voltage (VIN-V2).

[0056] The second comparator 1015 can receive a control voltage signal VIN and a predetermined negative voltage V2, and may be configured to transmit a second conduction signal to the second analog switch 1016 when the control voltage signal VIN is lower than the predetermined negative voltage V2, and to transmit a second cutoff signal to the second analog switch 1016 when the control voltage signal VIN is equal to or greater than the predetermined negative voltage V2. Here, the second conduction signal may be at a high potential, and the second cutoff signal may be at a low potential.

[0057] The second analog switch 1016 may be arranged as follows. In response to the received second conduction signal, the conduction between the first input terminal a and the output terminal c of the second analog switch 1016 is controlled, thereby enabling the voltage (VIN-V2) at the first input terminal a of the second analog switch 1016 to be transmitted to the second input terminal of the third arithmetic unit 1017. In response to the received second cutoff signal, the cutoff between the first input terminal a and the output terminal c of the second analog switch 1016 is controlled.

[0058] Thus, when the control voltage signal VIN is lower than a predetermined negative voltage V2, the voltage at the second input terminal of the third arithmetic unit 1017 is set to (VIN-V2), and when the control voltage signal VIN is equal to or greater than the predetermined negative voltage V2, the transmission of (VIN-V2) to the input terminal of the third arithmetic unit 1017 is avoided.

[0059] Specifically, the third arithmetic unit 1017 may be configured to add the voltage signals at its input terminals and transmit them to the first driver 102. Exemplarily, the third arithmetic unit 1017 may have two input terminals. One of these two input terminals is connected to the output terminal c of the first analog switch 1013 and the output terminal c of the second analog switch 1016 and is used to receive the voltages (VIN-V1) and (VIN-V2). The other of these two input terminals receives a zero voltage.

[0060] In this way, the following is achieved: When the control voltage signal VIN is higher than a predetermined positive voltage V1, the voltage output by the signal conversion circuit 101 to the first driver 102 is equal to the sum of the voltage (VIN-V1) and the zero voltage, i.e., the voltage (VIN-V1). When the control voltage signal VIN is less than or equal to the predetermined positive voltage V1 and greater than or equal to a predetermined negative voltage V2, the voltage output by the signal conversion circuit 101 to the first driver 102 is equal to the zero voltage. When the control voltage signal VIN is lower than a predetermined negative voltage V2, the voltage output by the signal conversion circuit 101 to the first driver 102 is equal to the sum of the voltage (VIN-V2) and the zero voltage, i.e., the voltage (VIN-V2).

[0061] Specifically, as shown in Figure 7, the signal conversion circuit 101 may further include a controllable switch KA. The control terminal of the controllable switch KA is connected to the output terminal of the first comparator 1012, and the controllable switch KA is connected to the first analog switch 1013. Exemplarily, the controllable switch KA is specifically a metal-oxide-semiconductor field effect transistor (MOSFET). The controllable switch KA may be configured to transmit a first conduction signal to the first analog switch 1013 when conducting, and may be configured to transmit a first cutoff signal to the first analog switch 1013 when cut off. The first comparator 1012 may be configured specifically as follows. When the control voltage signal VIN is higher than a predetermined positive voltage V1, the conduction of the controllable switch V1 is controlled, and a first conduction signal is sent to the first analog switch 1013. When the control voltage signal VIN is less than or equal to the predetermined positive voltage V1, the disconnection of the controllable switch KA is controlled, and a first disconnection signal is sent to the first analog switch 1013. This prevents simultaneous conduction of the first analog switch 1013 and the second analog switch 1016, improving the stability and reliability of the drive circuit 10.

[0062] Specifically, as shown in Figure 6, the signal conversion circuit 101 further includes a first buffer 1018, a second buffer 1019, and a third buffer 1010. Here, the first buffer 1018 is connected between the first analog switch 1013 and the third arithmetic unit 1017, and can enhance the signal power of the voltage signal transmitted between the first analog switch 1013 and the third arithmetic unit 1017. The second buffer 1019 is connected between the second analog switch 1016 and the third arithmetic unit 1017, and can enhance the signal power of the voltage signal transmitted between the second analog switch 1016 and the third arithmetic unit 1017. The third buffer 1010 is connected between the third arithmetic unit 1017 and the first driver 102, and can enhance the signal power of the voltage signal transmitted between the third arithmetic unit 1017 and the first driver 102. In this way, it is advantageous for improving the stability and reliability of the drive circuit 10.

[0063] Furthermore, in specific implementation, as shown in Figure 8, the predetermined positive voltage V1 may be equal to the reference voltage VREF. The absolute value of the predetermined negative voltage V2 may be equal to the reference voltage VREF. Specifically, the first arithmetic unit 1011 may be specifically a subtractor U6A. For the specific structure of the subtractor U6A and its connection relationship with other devices, please refer to Figure 8, and the explanation is omitted here. The first comparator 1012 may be specifically a comparator U6B. For the specific structure of the comparator U6B and its connection relationship with other devices, please refer to Figure 8, and the explanation is omitted here. The first analog switch 1013 may be specifically an analog switch U12. For the specific structure of the analog switch U12 and its connection relationship with other devices, please refer to Figure 8, and the explanation is omitted here. The second arithmetic unit 1014 may be specifically an adder U7B. The specific structure of adder U7B and its connection to other devices can be found in Figure 8, and the explanation is omitted here. The second comparator 1015 may specifically be comparator U7C. The reference voltage VREF is transmitted to the second comparator 1015 after being inverted by the voltage inverter U7A. The specific structure of comparator U7C and its connection to other devices can be found in Figure 8. The specific structure of voltage inverter U7A and its connection to other devices can be found in Figure 8, and the explanation is omitted here. The second analog switch 1016 may specifically be analog switch U11. The specific structure of analog switch U11 and its connection to other devices can be found in Figure 8, and the explanation is omitted here. The third arithmetic unit 1017 may specifically be adder U9A. The specific structure of adder U9A and its connection to other devices can be found in Figure 8, and the explanation is omitted here. The controllable switch KA may specifically be the switch transistor Q1. The specific structure of the switch transistor Q1 and its connection relationships with other devices can be seen in Figure 8, and are omitted here. The first buffer 1018 may specifically be the buffer U8A.The specific structure of buffer U8A and its connection relationships with other devices can be found in Figure 8, and a detailed explanation is omitted here. The second buffer 1019 may be buffer U8B. The specific structure of buffer U8B and its connection relationships with other devices can be found in Figure 8, and a detailed explanation is omitted here. The third buffer 1010 may be buffer U9B. The specific structure of buffer U9B and its connection relationships with other devices can be found in Figure 8, and a detailed explanation is omitted here.

[0064] As can be seen from the above, the drive circuit provided in this embodiment includes a plurality of drive branch circuits. The input terminals of each of the plurality of drive branch circuits each receive a control signal. The output terminals of each of the plurality of drive branch circuits are connected to a plurality of target devices for outputting force. The plurality of drive branch circuits include at least one first drive branch circuit. Here, the first drive branch circuit is arranged as follows: If the received control signal satisfies a first predetermined condition, the corresponding target device is controlled to a first output state, and if the received control signal satisfies a second predetermined condition, the corresponding target device is controlled to a second output state. The force output by the target device corresponding to the first drive branch circuit under the first output state is smaller than the force output under the second output state. Thus, in the process of controlling a target device (e.g., a motor) to output a desired magnitude of force by controlling the drive circuit with a control signal, the drive circuit is able to independently control the output of a single target device, the drive circuit is able to simultaneously suit control scenes for a wide range of output and high precision output, the control performance of the drive circuit is improved, the application scenarios of the product are broadened, and the applicability of the product is improved.

[0065] In embodiments of the present invention, a vibration reduction system is further provided. This vibration reduction system includes a drive circuit according to any one of the embodiments described above and a plurality of target devices (e.g., motors) for outputting force, wherein the drive circuit is used to drive the plurality of target devices to output force, thereby realizing the active vibration reduction function of this vibration reduction system.

[0066] Specifically, the drive circuit includes multiple drive branch circuits. The input terminals of each of the multiple drive branch circuits receive control signals. The output terminals of each of the multiple drive branch circuits are connected to multiple target devices that output force. The multiple drive branch circuits include at least one first drive branch circuit, where the first drive branch circuit is arranged as follows: If the received control signal satisfies a first predetermined condition, the corresponding target device is controlled to a first output state; if the received control signal satisfies a second predetermined condition, the corresponding target device is controlled to a second output state. The force output by the target device corresponding to the first drive branch circuit under the first output state is smaller than the force output under the second output state.

[0067] In some embodiments, the vibration reduction system may further include a bottom plate and a top plate, which are positioned opposite each other and spaced apart. The drive circuit and the target device may be provided between the bottom plate and the top plate. Specifically, the vibration reduction system may further include a load. The load may be fixed above the top plate. This achieves vibration reduction with respect to the load.

[0068] In some specific embodiments, the vibration reduction system may further include a spring vibration reduction assembly and a sensor assembly provided between a bottom plate and a top plate. Here, one end (i.e., the top end) of the spring vibration reduction assembly is fixed to the top plate, and the other end (i.e., the bottom end) of the spring vibration reduction assembly is fixed to the bottom plate. The sensor assembly is fixed to the top plate and is used to detect the movement of the top plate.

[0069] Specifically, the vibration reduction system may further include a controller. The controller can generate a control signal in response to the detection result of the sensor assembly and transmit this control signal to the input terminal of each drive branch circuit in the drive circuit.

[0070] Furthermore, in the vibration reduction system provided in the embodiment of the present invention, the drive circuit provided in the embodiment of the present invention is provided, and therefore, beneficial effects that can be achieved by any one of the drive circuits provided in the embodiment of the present invention are realized. Details have been explained in the embodiment, so they will be omitted here.

[0071] The above description is merely a preferred embodiment of the present invention and does not limit it. Any modifications, equivalent substitutions, and improvements made within the spirit and concept of the present invention are all within the scope of protection of the present invention.

Claims

1. A drive circuit used in a vibration reduction system that includes a load and multiple target devices for outputting force, The multiple target devices are all motors, and the drive circuit is used to reduce vibrations with respect to the load by driving the multiple target devices. The drive circuit includes a plurality of drive branch circuits, the input terminals of each of the plurality of drive branch circuits each receive a control signal, the output terminals of each of the plurality of drive branch circuits are connected to a plurality of target devices in the vibration reduction system, and the plurality of drive branch circuits include at least one first drive branch circuit and at least one second drive branch circuit. The first drive branch circuit includes a signal conversion circuit and a first driver, the signal conversion circuit receives the control signal and is connected to the first driver, and the first driver is connected to the corresponding target device. The control signal is a control voltage signal, The signal conversion circuit is configured such that, if the received control voltage signal is greater than a predetermined negative voltage and less than a predetermined positive voltage, it converts the control voltage signal to a zero voltage and transmits the zero voltage to the first driver as a first attenuated control signal; and if the received control voltage signal is less than or equal to the predetermined negative voltage or greater than or equal to the predetermined positive voltage, it attenuates the control voltage signal by a predetermined amount to obtain a second attenuated control signal and transmits the second attenuated control signal to the first driver. The first driver is configured to control the target device to a first output state by controlling the corresponding target device to stop outputting force in response to the received zero voltage, and to control the target device to a second output state by controlling the corresponding target device to output force in response to the received second attenuated control signal according to the second attenuated control signal, wherein the magnitude of the force output by the corresponding target device in the first output state is smaller than the magnitude of the force output in the second output state. The second drive branch circuit is arranged to respond to the received control signal and control the corresponding target device to a third output state. The force output by the target device corresponding to the second drive branch circuit under the third output state is greater than the force output by the target device corresponding to the first drive branch circuit under the second output state. A drive circuit characterized in that the control signal is used to control the overall output magnitude of all the target devices driven by the drive circuit, and when the control signal is greater than a predetermined negative voltage and less than a predetermined positive voltage, the overall output magnitude of all the target devices driven by the drive circuit is within a first range, and when the control signal is less than or equal to the predetermined negative voltage or greater than or equal to the predetermined positive voltage, the overall output magnitude of all the target devices driven by the drive circuit is within a second range, and the magnitude of the first range is smaller than the magnitude of the second range.

2. The signal conversion circuit, when the received control voltage signal is below a predetermined negative voltage or above a predetermined positive voltage, attenuates the control voltage signal by a predetermined amount to obtain a second attenuated control signal, and transmits the second attenuated control signal to the first driver, specifically If the received control voltage signal is less than or equal to the predetermined negative voltage, the predetermined negative voltage is subtracted from the control voltage signal to obtain a second attenuated control signal, and the second attenuated control signal is transmitted to the first driver. The drive circuit according to claim 1, characterized in that, if the received control voltage signal is equal to or greater than the predetermined positive voltage, the predetermined positive voltage is subtracted from the control voltage signal to obtain a second attenuated control signal, and the second attenuated control signal is transmitted to the first driver.

3. The signal conversion circuit includes a first arithmetic unit, a first comparator, a first analog switch, a second arithmetic unit, a second comparator, a second analog switch, and a third arithmetic unit, wherein the first arithmetic unit and the first comparator are both connected to the first analog switch, the second arithmetic unit and the second comparator are both connected to the second analog switch, the first analog switch and the second analog switch are both connected to the third arithmetic unit, and the third arithmetic unit is connected to the first driver. Here, the first arithmetic unit is configured to receive the control voltage signal and the predetermined positive voltage, subtract the predetermined positive voltage from the control voltage signal, and then transmit the result to the first input terminal of the first analog switch. The first comparator is configured to receive the control voltage signal and the predetermined positive voltage, and to transmit a first conduction signal to the first analog switch when the control voltage signal is greater than the predetermined positive voltage, and to transmit a first cutoff signal to the first analog switch when the control voltage signal is less than or equal to the predetermined positive voltage. The first analog switch is configured to receive the received first conduction signal, control the conduction between the first input terminal and the output terminal of the first analog switch, transmit a control voltage signal obtained by subtracting the predetermined positive voltage to the input terminal of the third arithmetic unit, and, in response to the received first cutoff signal, control the cutoff between the first input terminal and the output terminal of the first analog switch. The second arithmetic unit is configured to receive the control voltage signal and the predetermined negative voltage, subtract the predetermined negative voltage from the control voltage signal, and then transmit the result to the first input terminal of the second analog switch. The second comparator is configured to receive the control voltage signal and the predetermined negative voltage, respectively, and to transmit a second conduction signal to the second analog switch when the control voltage signal is less than the predetermined negative voltage, and to transmit a second cutoff signal to the second analog switch when the control voltage signal is greater than or equal to the predetermined negative voltage. The second analog switch is arranged to respond to the received second conduction signal by controlling the conduction between the first input terminal and the output terminal of the second analog switch, thereby transmitting a control voltage signal after subtracting the predetermined negative voltage to the input terminal of the third arithmetic unit, and to respond to the received second cutoff signal by controlling the cutoff between the first input terminal and the output terminal of the second analog switch. The drive circuit according to claim 1, characterized in that the third arithmetic unit is arranged to add the voltage signals at its input terminal and then transmit them to the first driver.

4. The signal conversion circuit further includes a controllable switch, the control terminal of the controllable switch is connected to the output terminal of the first comparator, the controllable switch is connected to the first analog switch, the controllable switch is configured to transmit the first conduction signal to the first analog switch when conducting, and to transmit the first disconnection signal to the first analog switch when disconnecting, The drive circuit according to claim 3, wherein the first comparator is configured to transmit a first conduction signal to the first analog switch by controlling the controllable switch to conduct when the control voltage signal is greater than the predetermined positive voltage, and transmits a first disconnection signal to the first analog switch by controlling the controllable switch to disconnect when the control voltage signal is less than or equal to the predetermined positive voltage.

5. The drive circuit according to claim 3, wherein the signal conversion circuit further includes a first buffer, a second buffer, and a third buffer, the first buffer being connected between the first analog switch and the third arithmetic unit, the second buffer being connected between the second analog switch and the third arithmetic unit, and the third buffer being connected between the third arithmetic unit and the first driver.

6. A vibration reduction system characterized by including a drive circuit according to any one of claims 1 to 5.

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