CN113809950B - Piezoelectric semi-active control device based on flyback transformer - Google Patents
Piezoelectric semi-active control device based on flyback transformer Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/0075—Electrical details, e.g. drive or control circuits or methods
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
Abstract
The embodiment of the invention discloses a piezoelectric semi-active control device based on a flyback transformer, relates to the technical field of vibration semi-active control, can solve the problems that a direct-current voltage source circuit is complex in structure and cannot share the ground with a control circuit, and the like, and simplifies the difficulty in realizing self-adaptive voltage amplification. The invention includes: the piezoelectric element is adhered to the controlled structure and is connected with the vibration semi-active control circuit; vibration semi-active control circuit for control piezoelectric element's both ends voltage amplitude and phase place, vibration semi-active control circuit includes: the device comprises a flyback transformer, a direct current voltage source, three analog electronic switches and at least two diodes; the switch control signal generation module consists of a microcontroller and an analog switch driving module; the direct-current voltage source is used for inputting electric energy to the primary side of the flyback transformer, the flyback transformer is used for inputting electric energy to the piezoelectric element, and the time sequence of the input electric energy is controlled by the analog electronic switch. The invention is suitable for semi-active vibration control.
Description
Technical Field
The invention relates to the technical field of vibration semi-active control, in particular to a piezoelectric semi-active control device based on a flyback transformer.
Background
Vibrations are ubiquitous in nature, but most are harmful to structures. An active control system in the vibration control technology is large in size and high in energy consumption, and passive control environment adaptability is poor, so that semi-active control becomes a preferred scheme in many occasions. The semi-active control method based on the piezoelectric material is developed on the basis of piezoelectric active and passive control technologies, and typically represents a semi-active vibration control method based on a synchronous Switch Damping technology, namely an SSD (synchronous switched switching) technology. There are many semi-active vibration control methods based on SSD technology, the most representative of which are three: short circuit synchronous switch damping technology (SSDS), inductive synchronous switch damping technology (SSDI), and voltage synchronous switch technology (SSDV).
In the three piezoelectric semi-active vibration control methods, the vibration control effect of the SSDI technology is better than that of the SSDS technology, when a proper external voltage source is selected from the SSDV technology, the control effect is much better than that of the SSDI technology, but if the external voltage source is not properly selected, the system will have a stability problem. Therefore, an improved SSDV (Enhanced SSDV) technology is proposed based on the conventional SSDV technology, the method can change the voltage of the external voltage source in real time according to the structural vibration amplitude, and the robustness of the system is improved by the adaptive optimization of the external voltage source. In addition, the direct current voltage source in the SSDV has a complicated circuit structure, and cannot be grounded with a control circuit, and the like.
Disclosure of Invention
The embodiment of the invention provides a piezoelectric semi-active control device based on a flyback transformer, which can solve the problems that a direct-current voltage source circuit in the current SSDV technology is complex in structure and cannot share the ground with a control circuit, and the like, and simplifies the difficulty in realizing self-adaptive voltage amplification.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the main components include: the device comprises a piezoelectric element, a vibration semi-active control circuit and a switch control signal generation module; the piezoelectric element is adhered to the controlled structure and is connected with the vibration semi-active control circuit; the semi-active control circuit that vibrates is used for controlling the voltage amplitude and the phase place at piezoelectric element both ends, semi-active control circuit that vibrates includes: the device comprises a flyback transformer, a direct current voltage source, three analog electronic switches and at least two diodes; the switch control signal generation module consists of a microcontroller and an analog switch driving module; the direct-current voltage source is used for inputting electric energy to the primary side of the flyback transformer, the flyback transformer is used for inputting electric energy to the piezoelectric element, and the time sequence of the input electric energy is controlled by the analog electronic switch.
According to the piezoelectric semi-active control device based on the flyback transformer, the piezoelectric element is adhered to the controlled structure and connected with the vibration semi-active control circuit to serve as the vibration of the driver control structure. The vibration semi-active control circuit comprises an analog electronic switch and a flyback transformer with high quality factor, and is respectively used for controlling the on-off of the vibration semi-active control circuit and the electric energy conversion of the primary side and the secondary side. The analog electronic switch comprises a voltage reversal control switch group and an energy injection control switch. The switch control signal generation module is used for generating a switch driving analog signal 1 and a switch driving analog signal 2 and respectively acting on the voltage turnover control switch group and the energy injection control switch. The switch driving analog signal 2 controls the energy injection control switch to adjust the electric energy injected into the flyback transformer, and the switch driving analog signal 1 controls the voltage turnover control switch group to change the amplitude and the phase of the voltage at two ends of the piezoelectric element, so that the energy of electromechanical conversion is improved to realize the optimal control function of structural vibration.
Compared with the existing SSDV technology, the vibration control method and the vibration control device can achieve a better vibration control effect under the condition that an external voltage source with the same voltage is used, and compared with the improved SSDV technology, the vibration control method and the vibration control device have the problems that a direct-current voltage source circuit is complex in structure and cannot share the ground with a control circuit, and the like, so that the difficulty in achieving self-adaptive voltage amplification is simplified.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a piezoelectric semi-active control method based on a flyback transformer according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a vibration semi-active control circuit of a synchronous switch damping technique (SSDEI) based on energy injection according to an embodiment of the present inventionWherein Piezo is a piezoelectric element, S 1 、S 3 A first N-channel MOS tube and a second N-channel MOS tube of the vibration semi-active control circuit respectively, S 2 Is a P-channel MOS transistor of the vibration semi-active control circuit, D 1 、D 2 First and second rectifier diodes L of the vibration semi-active control circuit, respectively 1 、L 2 Respectively, a first secondary coil and a second secondary coil of the flyback transformer, L 3 Is the primary winding of the flyback transformer, V 1 The driving circuit is a direct-current voltage source of the vibration semi-active control circuit, and the switch driving analog signal 1 and the switch driving analog signal 2 are two switch driving analog signals output by the switch control signal generation module respectively.
FIG. 3 is a schematic diagram of the operation steps of a vibration semi-active control circuit based on the energy injection synchronous switch damping technology (SSDEI) provided by the embodiment of the invention;
fig. 4 is a graph of time-varying displacement signals of the vibration structure and voltage and current signals of the piezoelectric element respectively when the vibration semi-active control circuit provided in the embodiment of the present invention operates at different stages, and a schematic diagram of time relationships between two switch driving analog signals output by the switch control signal generation module and the displacement, voltage and current signals respectively.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail with reference to the accompanying drawings and the detailed description below. Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment of the invention provides a piezoelectric semi-active control device based on a flyback transformer, which comprises:
the main components of the device comprise: the device comprises a piezoelectric element, a vibration semi-active control circuit and a switch control signal generation module.
The piezoelectric element is adhered to the controlled structure and connected with the vibration semi-active control circuit for controlling the vibration of the structure.
The semi-active control circuit of vibration is used for controlling the voltage amplitude and the phase place at two ends of the piezoelectric element, and the semi-active control circuit of vibration includes: the device comprises a flyback transformer, a direct current voltage source, three analog electronic switches and at least two diodes.
The switch control signal generation module consists of a microcontroller and an analog switch driving module (also called as a driving circuit).
The direct-current voltage source is used for inputting electric energy to the primary side of the flyback transformer, the flyback transformer is used for inputting electric energy to the piezoelectric element, and the time sequence of the input electric energy is controlled by the analog electronic switch. The piezoelectric semi-active control system based on the flyback transformer shown in fig. 1 comprises a piezoelectric element, a vibration semi-active control circuit and a switch control signal generation module. The piezoelectric element is attached to the cantilever beam and connected with the vibration semi-active control circuit to serve as a driver to control vibration of the structure. The vibration semi-active control circuit is a circuit for realizing the SSDEI technology and comprises an analog electronic switch, a flyback transformer with high quality factor, two diode modules and a direct-current voltage source.
In this embodiment, the analog electronic switch may include a voltage-reversal control switch group and an energy-injection control switch. The switch control signal generation module comprises a control signal feedback module, a microcontroller and an analog switch driving module, wherein the control signal feedback module is connected with the microcontroller, and the microcontroller is connected with the analog switch driving module. Specifically, each analog electronic switch includes: a voltage reversal control switch group and an energy injection control switch. Wherein, voltage upset control switch group includes: the first N-channel MOS tube and the P-channel MOS tube are used for controlling the vibration semi-active control circuit to work so as to realize the voltage overturning action of the piezoelectric element.
The energy injection control switch includes: and the second N-channel MOS tube is used for adjusting the electric energy injected into the flyback transformer.
In this embodiment, the flyback transformer further includes: the primary winding comprises a first secondary winding, a second secondary winding and a primary winding, wherein the same-name ends of the first secondary winding and the second secondary winding are the same and are opposite to the primary winding, and the turn ratio of the three windings can be any value in principle. And the primary coil is used for converting the electric energy of the direct-current power supply into magnetic field energy and storing the magnetic field energy into the flyback transformer. The first secondary side coil and the second secondary side coil are used for converting magnetic field energy into electric energy and injecting the electric energy into the piezoelectric element in the voltage overturning process so as to improve the amplitude of overturning voltage.
In this embodiment, the switch control signal generating module further includes a control signal feedback module. And the control signal feedback module is used for acquiring the vibration displacement of the controlled structure in real time. And the microcontroller is used for processing the control logic and generating a switch control signal. And the analog switch driving module is used for driving the corresponding electronic switch to be switched on or switched off according to the control signal output by the microcontroller.
In this embodiment, the vibration semi-active control circuit is specifically a piezoelectric semi-active control circuit based on a flyback transformer, and mainly includes: the energy injection circuit comprises a voltage reversal circuit and an energy injection circuit.
Wherein, the voltage reversal circuit includes:
the first N-channel MOS tube, the P-channel MOS tube, the first rectifier diode, the second rectifier diode and the first and second secondary side coils of the flyback transformer. The anode of the first rectifier diode is connected with one surface of the piezoelectric element, and the cathode of the first rectifier diode is connected with the dotted terminal of the first secondary coil of the flyback transformer. The drain electrode of the first N-channel MOS tube is connected with the non-dotted terminal of the first secondary coil of the flyback transformer, the source electrode of the first N-channel MOS tube is connected with the other surface of the piezoelectric element and grounded, and the grid electrode of the first N-channel MOS tube is connected with the analog switch driving module. And the cathode of the second rectifier diode is connected with one end of the piezoelectric element, and the anode of the second rectifier diode is connected with the non-dotted end of the second secondary coil of the flyback transformer. The drain electrode of the P-channel MOS tube is connected with the dotted terminal of the second secondary coil of the flyback transformer, the source electrode of the P-channel MOS tube is connected with the other end of the piezoelectric element and grounded, and the grid electrode of the P-channel MOS tube is connected with the analog switch driving module.
The energy injection circuit comprises: the second N-channel MOS tube, a primary coil of the flyback transformer and a direct current voltage source. The drain electrode of the second N-channel MOS tube is connected with the negative electrode of the direct-current voltage source, the source electrode of the second N-channel MOS tube is connected with the non-dotted terminal of the flyback transformer and grounded, and the grid electrode of the second N-channel MOS tube is connected with the analog switch driving module. And the positive electrode of the direct-current voltage source is connected with the dotted terminal of the primary coil of the flyback transformer.
In this embodiment, the diode of the vibration semi-active control circuit includes: the diode of the vibration semi-active control circuit is used for automatically ending voltage overturning action after voltage overturning.
In this embodiment, an operation process of the piezoelectric semi-active control device may be designed, which at least includes the following steps:
and a control signal feedback module is used for acquiring a displacement signal of the structural vibration in real time and transmitting the displacement signal to the microcontroller.
The microcontroller detects the extreme value of the displacement signal in real time and generates two switch signals at the extreme value to be transmitted to the analog switch driving module.
The analog switch driving module amplifies the two switch signals and outputs a switch driving analog signal 1 and a switch driving analog signal 2 which respectively act on the voltage turnover control switch group and the energy injection control switch.
And the energy injection control switch controls the energy injection loop to work and adjusts the electric energy injected into the flyback transformer before the action of turning over the voltage starts under the action of the switch driving analog signal 2.
The flyback transformer converts the injected electric energy into magnetic field energy to be stored and converts the magnetic field energy into electric energy to be injected into a voltage overturning loop of the vibration control semi-active control circuit when the voltage overturning action starts.
The voltage overturning control switch group controls the voltage overturning loop to work under the drive of the switch driving analog signal 1 to realize the voltage overturning action of the piezoelectric element, and the diode automatically finishes the action of voltage overturning after the voltage overturning.
The design objective of the invention is as follows: the piezoelectric semi-active control circuit and method based on the flyback transformer are simple in structure and easy to achieve. Compared with the SSDV technology, the vibration control method can achieve better vibration control effect under the condition of using an external voltage source with the same voltage; furthermore, compared with a more complex self-adaptive voltage source regulating circuit in the improved SSDV technology, the method can realize the self-adaptive regulation of the output voltage along with the structural vibration displacement only by self-adaptively regulating the switching signal generated by the microcontroller, thereby improving the robustness of the system.
The general design idea lies in that: on the basis of SSD technology, a Synchronous Switch Damping (SSDEI) control method based on energy injection is provided. The piezoelectric element is adhered to the controlled structure and connected with the vibration semi-active control circuit to be used as the vibration of the driver control structure. The vibration semi-active control circuit comprises an analog electronic switch and a flyback transformer with high quality factor, and is respectively used for controlling the on-off of the vibration semi-active control circuit and the electric energy conversion of the primary side and the secondary side. The analog electronic switch comprises a voltage reversal control switch group and an energy injection control switch. The switch control signal generation module is used for generating a switch driving analog signal 1 and a switch driving analog signal 2 and respectively acting on the voltage turnover control switch group and the energy injection control switch. The switch driving analog signal 2 controls the energy injection control switch to adjust the electric energy injected into the flyback transformer, and the switch driving analog signal 1 controls the voltage turnover control switch group to change the amplitude and the phase of the voltage at two ends of the piezoelectric element, so that the energy of electromechanical conversion is improved to realize the optimal control function of structural vibration.
Compared with the existing SSDV technology, the vibration control circuit can achieve a better vibration control effect under the condition that an external voltage source with the same voltage is used, and compared with the improved SSDV technology, the vibration control circuit has the problems that a direct-current voltage source circuit is complex in structure and cannot share the ground with a control circuit, and the like.
The following describes a practical application of the present embodiment by referring to specific examples:
as shown in figure 1, a sinusoidal exciting force with the same frequency as the first-order resonance frequency of the cantilever beam is generated by the exciter and acts on one end of the cantilever beam to enable the cantilever beam to resonate. The piezoelectric element is attached to the cantilever beam and vibrates with the same frequency and the same phase as the cantilever beam to generate an alternating voltage signal, the laser displacement sensor is used as a control signal feedback module to measure the vibration displacement of the other end of the cantilever beam and generate a sinusoidal displacement analog signal, and the alternating voltage signal generated by the piezoelectric element is in the same phase with the sinusoidal displacement signal measured by the laser displacement sensor when the cantilever beam resonates at the first-order resonant frequency.
The microcontroller converts the displacement analog signal output by the laser displacement sensor into a digital signal, detects an extreme value of the displacement digital signal in real time through a control logic program, respectively generates a switch digital signal 1 and a switch digital signal 2 at the extreme value, converts the extreme value into the analog signal, amplifies the analog signal by the analog switch driving module to generate a switch driving analog signal 1 and a switch driving analog signal 2, and respectively acts on the voltage turnover control switch group and the energy injection control switch;
as shown in fig. 2, the flyback transformer in the SSDEI circuit divides the circuit into two parts, namely a voltage inversion loop and an energy injection loop. The voltage reversal loop is composed of two secondary coils L 1 、L 2 And N-channel MOS transistor S 1 P-channel MOS transistor S 2 And two rectifier diodes D 1 、D 2 Formed and attached directly to the piezoelectric element. The energy injection loop is composed of a primary coil L 3 N-channel MOS transistor S 3 And a DC voltage source V 1 And (4) forming. Switch driving analog signal 1 generated by analog switch driving module acts on N-channel MOS tube S 1 And P channel MOS tube S 2 And when the voltage of the switch driving analog signal 1 is positive S 1 Conduction S 2 Off, when the voltage is negative S 2 Conducting S 1 Disconnecting; switch driving analog signal 2 acts on N-channel MOS tube S 3 On the gate of (1), and S 3 Only conduct when the switch driving analog signal 2 voltage is positive and reaches a threshold.
As shown in fig. 3 and 4, the SSDEI circuit performs two actions in one vibration cycle of the cantilever, which are respectively turning the voltage of the piezoelectric element from positive to negative and from negative to positive, and continuously repeats the two actions in other vibration cycles of the cantilever. The operation of the SSDEI circuit for inverting the voltage of the piezoelectric element from positive to negative in one operating cycle of the SSDEI circuit is further described with reference to fig. 3 and 4 (in the operation process, the voltages of the switch driving analog signal 1 and the switch driving analog signal 2 both reach the conduction threshold voltage of the MOS transistor):
(1) In the time period, the voltage of the switch driving analog signal 1 is negative, and the voltage of the switch driving analog signal 2 is zero, so that the P-channel MOS transistor S 2 Conducting N-channel MOS transistor S 3 And (5) disconnecting. Since the voltage across the piezoelectric element is now positive, the rectifier diode D is thus present 2 In a reverse cut-off state, so that the circuit is always kept in an open state in the period;
(2) In the period, the voltage of the switch driving analog signal 1 is still negative, and the voltage of the switch driving analog signal 2 is changed into positive, so that the P-channel MOS transistor S 2 And N-channel MOS transistor S 3 Are all in a conducting state. At this time, the voltage on the piezoelectric element is still positive and the dotted terminal of the flyback transformer is reversed to cause the secondary coil L 2 Voltage direction and zener diode D 2 Opposite polarity, so that the rectifier diode D 2 Still in the reverse blocking state, i.e. the left circuit part is still open. At this time, the primary coil L 3 And a DC voltage source V 1 Forming a closed loop, DC voltage source V 1 Through a primary winding L 3 And charging the flyback transformer. Primary coil L in this period 3 The direction and the variation curve of the working current are shown as I in fig. 3 and 4 pri Shown;
(3) The moment the voltage of the switching signal 2 changes to be negative in the period, the voltage of the switching signal 1 changes to be positive, namely the N-channel MOS tube S 3 Disconnected instant N-channel MOS tube S 1 And conducting. At this time, the secondary coil L 1 Piezoelectric element, rectifier diode D 1 A closed loop is formed, the circuit is similar to an LC oscillating circuit due to the capacitance of the piezoelectric element, a high-frequency oscillating loop is formed, and the voltage of the piezoelectric element and the N-channel MOS tube S are enabled to pass through a half oscillation period 1 Reverse before conduction, at which time the rectifier diode D 1 The reverse cutoff opens the LC tank. And in the last step, the flyback transformer passes through the primary coil L 3 The stored energy passes through the secondary winding L when the voltage is reversed 1 Injected into the oscillating circuitOne step increases the amplitude of the voltage across the piezoelectric element. Secondary winding L in the period 1 The working current direction and curve are shown as I in fig. 3 and 4 sec As shown.
The operation of the SSDEI circuit to reverse the voltage of the piezoelectric element from negative to positive is the same as the operation of reversing the voltage from positive to negative in principle, and is only due to the secondary winding L of the flyback transformer 2 And a rectifier diode D 2 Direction of connection in oscillating circuit with secondary winding L 1 And a rectifier diode D 1 The direction in the tank circuit is reversed and the voltage of the piezoelectric element before reversal is negative, so that the reversed voltage direction is reversed.
The two actions not only enable the force generated by the piezoelectric element to keep opposite to the structural speed, but also increase the amplitude of the voltage on the piezoelectric element, thereby improving the electromechanical conversion efficiency, improving the electromechanical conversion energy of the system and playing the role of vibration control.
Furthermore, the microcontroller adaptively adjusts the duty ratio of the switch driving analog signal 2 according to the vibration displacement amplitude of the cantilever beam, so that the direct-current voltage source can be adaptively adjusted to the primary coil L when the right part loop of the SSDEI circuit works 3 The magnitude of the charged energy, namely the magnitude of the energy injected into the oscillating circuit by the flyback transformer during voltage overturning, thereby realizing the self-adaptive adjustment of the magnitude of the voltage amplification when the SSDEI circuit overturns the voltage of the piezoelectric element according to the change of the vibration amplitude of the cantilever beam. When the cantilever beam vibrates in a small amplitude, if the voltage with overlarge amplification is over-large, the cantilever beam is unstable, and new vibration is generated, so that the robustness of the vibration control system can be improved by adaptively adjusting the voltage amplification according to the vibration amplitude of the vibration structure.
Compared with the SSDV technology, the self-adaptive vibration control circuit can achieve better vibration control effect under the condition that an external voltage source with the same voltage is used, and compared with the improved SSDV technology, the self-adaptive vibration control circuit has the problems that a direct-current voltage source circuit is complex in structure and cannot be grounded with a control circuit, and the like.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the apparatus embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the description of the method embodiments for relevant points. The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. The piezoelectric semi-active control device based on the flyback transformer is characterized by comprising the following main components: the device comprises a piezoelectric element, a vibration semi-active control circuit and a switch control signal generation module;
the piezoelectric element is adhered to the controlled structure and is connected with the vibration semi-active control circuit;
the semi-active control circuit that vibrates is used for controlling the voltage amplitude and the phase place at piezoelectric element both ends, semi-active control circuit that vibrates includes: the device comprises a flyback transformer, a direct current voltage source, three analog electronic switches and at least two diodes;
the switch control signal generation module comprises a microcontroller and an analog switch driving module;
the direct-current voltage source is used for inputting electric energy to the primary side of the flyback transformer, the flyback transformer is used for inputting electric energy to the piezoelectric element, and the time sequence of the input electric energy is controlled by the analog electronic switch;
the circuit structure of the vibration semi-active control circuit comprises: the energy injection circuit comprises a voltage overturning loop and an energy injection loop;
wherein, the voltage reversal circuit includes: the flyback transformer comprises a first N-channel MOS tube, a P-channel MOS tube, a first rectifier diode, a second rectifier diode and first and second secondary side coils of the flyback transformer;
the anode of the first rectifier diode is connected with one surface of the piezoelectric element, and the cathode of the first rectifier diode is connected with the dotted terminal of the first secondary coil of the flyback transformer;
the drain electrode of the first N-channel MOS tube is connected with the non-dotted terminal of the first secondary coil of the flyback transformer, the source electrode of the first N-channel MOS tube is connected with the other surface of the piezoelectric element and grounded, and the grid electrode of the first N-channel MOS tube is connected with the analog switch driving module;
the cathode of the second rectifier diode is connected with one end of the piezoelectric element, and the anode of the second rectifier diode is connected with the non-dotted end of the second secondary coil of the flyback transformer;
the drain electrode of the P-channel MOS tube is connected with the dotted terminal of the second secondary coil of the flyback transformer, the source electrode of the P-channel MOS tube is connected with the other end of the piezoelectric element and grounded, and the grid electrode of the P-channel MOS tube is connected with the analog switch driving module.
2. The flyback transformer based piezoelectric semi-active control device of claim 1, wherein the three analog electronic switches comprise: the voltage inversion control switch group and the energy injection control switch;
wherein, the voltage reversal control switch group includes: the first N-channel MOS tube and the P-channel MOS tube are used for controlling the vibration semi-active control circuit to work so as to realize the voltage overturning action of the piezoelectric element;
the energy injection control switch includes: and the second N-channel MOS tube is used for adjusting the electric energy injected into the flyback transformer.
3. The flyback transformer based piezoelectric semi-active control device of claim 1, wherein the flyback transformer comprises: the primary coil is connected with the first secondary coil and the second secondary coil;
the primary coil is used for converting the electric energy of the direct-current power supply into magnetic field energy and storing the magnetic field energy into the flyback transformer; the first secondary side coil and the second secondary side coil are used for converting magnetic field energy into electric energy and injecting the electric energy into the piezoelectric element in the voltage overturning process so as to improve the amplitude of overturning voltage.
4. The flyback transformer based piezoelectric semi-active control device of claim 1, wherein the switching control signal generation module further comprises a control signal feedback module;
the control signal feedback module is used for acquiring the vibration displacement of the controlled structure in real time;
the microcontroller is used for processing the control logic and generating a switch control signal;
and the analog switch driving module is used for driving the corresponding electronic switch to be switched on or switched off according to the control signal output by the microcontroller.
5. The flyback transformer based piezoelectric semi-active control device of claim 1, wherein the energy injection loop comprises:
the second N-channel MOS tube, a primary coil of the flyback transformer and a direct-current voltage source are connected;
the drain electrode of the second N-channel MOS tube is connected with the negative electrode of the direct-current voltage source, the source electrode of the second N-channel MOS tube is connected with the non-dotted terminal of the primary coil of the flyback transformer and is grounded, and the grid electrode of the second N-channel MOS tube is connected with the analog switch driving module;
and the positive electrode of the direct current voltage source is connected with the dotted terminal of the primary coil of the flyback transformer.
6. The flyback transformer based piezoelectric semi-active control device of claim 1, wherein the diode of the vibrating semi-active control circuit comprises: the diode of the vibration semi-active control circuit is used for automatically ending voltage overturning action after voltage overturning.
7. The flyback transformer based piezoelectric semi-active control device according to any of claims 1-6, comprising at least the following steps during the operation of the piezoelectric semi-active control device:
obtaining a displacement signal of structural vibration in real time through a control signal feedback module and transmitting the displacement signal to the microcontroller;
the microcontroller detects the extreme value of the displacement signal in real time and generates two switch signals at the extreme value to be transmitted to the analog switch driving module;
the analog switch driving module amplifies the two switch signals and outputs a switch driving analog signal 1 and a switch driving analog signal 2 which respectively act on the voltage turnover control switch group and the energy injection control switch;
the energy injection control switch controls the energy injection loop to work and adjusts the electric energy injected into the flyback transformer before the action of turning over the voltage starts under the action of the switch driving analog signal 2;
the flyback transformer converts the injected electric energy into magnetic field energy to be stored and converts the magnetic field energy into electric energy to be injected into a voltage overturning loop of the vibration control semi-active control circuit when the voltage overturning action starts;
the voltage overturning control switch group controls the voltage overturning loop to work under the drive of the switch driving analog signal 1 to realize the voltage overturning action of the piezoelectric element, and the diode automatically finishes the action of voltage overturning after the voltage overturning.
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| CN103427708A (en) * | 2013-08-28 | 2013-12-04 | 南京浩之德智能科技有限公司 | Broadband vibration energy recovery device based on piezoelectric materials |
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| CN101488033B (en) * | 2008-12-12 | 2010-06-30 | 南京航空航天大学 | Structural vibration and noise control device based on energy recovery |
| CN103019268B (en) * | 2012-11-30 | 2014-10-15 | 南京航空航天大学 | Piezoelectric semi-active vibration control device based on synchronous switch damping technology |
| CN103036475A (en) * | 2012-11-30 | 2013-04-10 | 南京航空航天大学 | Self-powered vibrational energy extraction circuit based on piezoelectric materials |
| CN109324645B (en) * | 2018-11-21 | 2019-11-12 | 南京航空航天大学 | A kind of asymmetric semi-active control aystem and method |
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| CN103427708A (en) * | 2013-08-28 | 2013-12-04 | 南京浩之德智能科技有限公司 | Broadband vibration energy recovery device based on piezoelectric materials |
| CN108448902A (en) * | 2018-04-20 | 2018-08-24 | 杭州电子科技大学 | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method |
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