CN113037131B - High-frequency high-efficiency driving controller of piezoelectric actuator - Google Patents
High-frequency high-efficiency driving controller of piezoelectric actuator Download PDFInfo
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Abstract
The invention provides a high-frequency high-efficiency driving controller of a piezoelectric actuator, which comprises: the power driving module is used for generating a linear driving signal so as to drive the piezoelectric actuator to act; the current detection module is used for acquiring the output current of the power driving module; the vibration detection module is used for acquiring a vibration state signal of the mechanical structure to be damped; the digital control module is used for acquiring a control signal based on the output current and the vibration state signal of the power driving module; wherein the power driving module comprises a linear power amplifier; the input signal of the linear power amplifier is a control signal, and the output generates a linear driving signal. According to the invention, the output current of the power driving module and the vibration state signal of the mechanical structure to be damped are obtained, so that the control signal is generated, and the linear power amplifier is used for outputting the linear driving signal based on the control signal, so that the driving controller is ensured to have higher output linearity.
Description
Technical Field
The invention relates to a driving circuit of a piezoelectric actuator, in particular to a high-frequency and high-efficiency driving controller of the piezoelectric actuator.
Background
The piezoelectric actuator taking the piezoelectric ceramics as the core is widely used due to the advantages of high precision, high response speed, no electromagnetic interference and the like, and one important application is vibration damping and vibration suppression of a mechanical structure, namely the piezoelectric actuator outputs displacement with the same amplitude and opposite phase according to the vibration state of the mechanical structure to counteract the vibration of the mechanical structure.
According to the difference of the mechanical structure of the piezoelectric actuator, the piezoelectric actuator can be divided into a direct-acting actuator, an ultrasonic actuator, an inchworm actuator and an inertia actuator, and the basic principle of the piezoelectric actuator is the inverse piezoelectric effect, namely the output displacement of the piezoelectric ceramic changes along with the input voltage. According to the operation principle of the piezoelectric actuator, the output performance of the piezoelectric actuator is directly determined by the performance of the driving power supply of the piezoelectric actuator, and the vibration reduction effect is further influenced.
The existing driving topologies are mainly divided into a charge type and a voltage type. The traditional charge type driver is essentially a current series negative feedback circuit, and the charge type driver has the charge leakage problem, so that the positioning of an actuator is unstable, and the unstable phenomenon is more obvious when high-frequency output is carried out; the voltage type driver is divided into a linear driving circuit and a switch type driving circuit, the problem of charge leakage does not exist, the output linearity of the linear driving circuit is high, but the heating is serious, the size and the weight are large, the loss of the switch type driving circuit is small, but ripples are inevitably introduced in the switching action, and the output precision is influenced. The wide-bandgap power device can effectively increase the switching speed and reduce the switching loss, but does not eliminate the harmonic wave caused by the switching action in principle, and can bring more serious electromagnetic interference along with the increase of the switching frequency, thereby causing adverse effects on a detection circuit, a conditioning circuit, a signal conversion circuit and the like in a control system.
Disclosure of Invention
In order to solve at least one of the above-described problems, the present invention provides a high-frequency high-efficiency driving controller of a piezoelectric actuator.
The technical scheme of the invention is realized as follows:
an embodiment of the present invention provides a high-frequency high-efficiency driving controller of a piezoelectric actuator, including:
the power driving module is used for generating a linear driving signal so as to drive the piezoelectric actuator to act;
the current detection module is used for acquiring the output current of the power driving module;
the vibration detection module is used for acquiring a vibration state signal of the mechanical structure to be damped;
the digital control module is used for generating a control signal based on the output current of the power driving module and the vibration state signal;
wherein the power driving module comprises a linear power amplifier; the input signal of the linear power amplifier is the control signal, and the output generates the linear driving signal.
As an optional implementation manner, the driving controller further includes:
and the real-time following power supply module is used for providing power supply voltage for the power driving module, and the power supply voltage changes in real time according to the requirement of the power driving module.
As an alternative embodiment, the digital control module comprises:
the analog-to-digital conversion circuit is used for receiving the output current of the power driving module and the vibration state signal and converting the output current of the power driving module and the vibration state signal into digital signals;
the digital control circuit is connected with the output end of the analog-to-digital conversion circuit and used for receiving the digital signal and generating an input voltage value required by the power driving module based on the digital signal;
the digital-to-analog conversion circuit is connected with the output end of the digital control circuit and is used for receiving the input voltage value and converting the input voltage value into an analog signal; and the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module.
As an optional embodiment, the driving controller further includes:
the voltage detection module is used for acquiring the output voltage of the power driving module;
the PI adjusting module is used for acquiring a PWM control signal based on the output voltage of the power driving module;
the power supply voltage changes in real time according to the requirements of the power driving module, and comprises the following steps:
and the real-time following power supply module changes the voltage value of the output power supply voltage in real time according to the PWM control signal.
As an optional implementation, the digital control module further includes: and the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module through the isolation circuit.
As an optional embodiment, the real-time following power supply module comprises a positive power supply circuit;
the positive power supply circuit includes: the positive switch circuit is formed by connecting a first switch circuit and a second switch circuit in parallel, the power output end of the positive switch circuit is grounded through a first capacitor, and the power input end of the positive switch circuit is grounded through a second capacitor;
the first switch circuit comprises a first switch, a second switch and a first inductor, the first switch and the second switch are connected in series, and one end of the first inductor is connected to the connection point of the first switch and the second switch;
the second switch circuit comprises a third switch, a fourth switch and a second inductor, the third switch and the fourth switch are connected in series, and one end of the second inductor is connected to the connection point of the third switch and the fourth switch;
the other end of the first inductor is connected with the other end of the second inductor to serve as a power supply output end of the positive switch circuit;
the first switch and the third switch are connected to serve as a power input end of the positive switch circuit.
As an optional embodiment, the real-time following power supply module comprises a negative power supply circuit;
the negative power supply circuit includes: the negative switch circuit is formed by connecting a third switch circuit and a fourth switch circuit in parallel, the power output end of the negative switch circuit is grounded through a third capacitor, and the power input end of the negative switch circuit is grounded through a fourth capacitor;
the third switch circuit comprises a fifth switch, a sixth switch and a third inductor, the fifth switch is connected with the sixth switch in series, and one end of the third inductor is connected to a connection point of the fifth switch and the sixth switch;
the fourth switching circuit comprises a seventh switch, an eighth switch and a fourth inductor, the seventh switch and the eighth switch are connected in series, and one end of the fourth inductor is connected to a connection point of the seventh switch and the eighth switch;
the other end of the third inductor is connected with the other end of the fourth inductor to serve as a power supply output end of the negative switch circuit;
the fifth switch and the seventh switch are connected as a power input end of the negative switch circuit.
As an optional implementation, the first switch, the second switch, the third switch, and the fourth switch are respectively: a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET;
the grid electrode of the first MOSFET, the grid electrode of the second MOSFET, the grid electrode of the third MOSFET and the grid electrode of the fourth MOSFET are respectively connected with the output end of the PI regulation module;
the first switch and the third switch are connected to serve as a power input end of the positive switch circuit, and the positive switch circuit comprises: the drain electrode of the first MOSFET is connected with the drain electrode of the third MOSFET to serve as the input end of the positive power supply circuit to be connected with a positive power supply;
the first switch and the second switch are connected in series, and one end of the first inductor is connected to a connection point of the first switch and the second switch, including: the source electrode of the first MOSFET is connected with the drain electrode of the second MOSFET and one end of the first inductor, and the source electrode of the second MOSFET is grounded;
the third switch and the fourth switch are connected in series, one end of the second inductor is connected to a connection point of the third switch and the fourth switch, and the inductance circuit comprises: and the source electrode of the third MOSFET is connected with the drain electrode of the fourth MOSFET and one end of the second inductor, and the source electrode of the fourth MOSFET is grounded.
As an optional embodiment, the real-time following power supply module comprises a negative power supply circuit;
the fifth switch, the sixth switch, the seventh switch, and the eighth switch are respectively: a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, and an eighth MOSFET;
the grid electrode of the fifth MOSFET, the grid electrode of the sixth MOSFET, the grid electrode of the seventh MOSFET and the grid electrode of the eighth MOSFET are respectively connected with the output end of the PI regulation module;
the fifth switch and the seventh switch are connected as a power input end of the negative switch circuit, and the negative switch circuit comprises: the drain electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET to serve as the input end of the negative power supply circuit to be connected with the negative power supply;
the fifth switch is connected in series with the sixth switch, and one end of the third inductor is connected to a connection point of the fifth switch and the sixth switch, including: the source electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET and one end of the third inductor, and the source electrode of the sixth MOSFET is grounded;
the seventh switch and the eighth switch are connected in series, and one end of the fourth inductor is connected to a connection point of the seventh switch and the eighth switch, including: and the source electrode of the seventh MOSFET is connected with the drain electrode of the eighth MOSFET and one end of the fourth inductor, and the source electrode of the eighth MOSFET is grounded.
As an alternative embodiment, the power driving module includes: a plurality of linear power amplifiers connected in parallel.
Compared with the prior art, the invention has at least the following advantages:
according to the embodiment of the invention, the output current of the power driving module and the vibration state signal of the mechanical structure to be damped are obtained, so that the control signal is generated, and the linear driving signal is output by using the linear power amplifier based on the control signal, so that the driving controller is ensured to have higher output linearity.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic block diagram of the circuit principle of the present invention;
FIG. 2 is a schematic diagram of the circuit schematic structure when the number of the linear power amplifiers is two according to the present invention;
FIG. 3 is a schematic diagram of the schematic circuit structure of the real-time follow power supply module according to the present invention;
fig. 4 is a schematic circuit diagram of a power driving module when the number of the linear power amplifiers is two according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that, the step numbers in the text are only for convenience of explanation of the specific embodiments, and do not serve to limit the execution sequence of the steps. The method provided by the embodiment can be executed by a related server, and the following description takes an electronic device such as a server or a computer as an example of an execution subject.
Referring to fig. 1 and 2, an embodiment of the present invention provides a high-frequency high-efficiency driving controller of a piezoelectric actuator, including:
the power driving module is used for generating a linear driving signal so as to drive the piezoelectric actuator to act;
the current detection module is used for acquiring the output current of the power driving module;
the vibration detection module is used for acquiring a vibration state signal of the mechanical structure to be damped;
the digital control module is used for generating a control signal based on the output current and the vibration state signal of the power driving module;
wherein the power driving module comprises a linear power amplifier; the input signal of the linear power amplifier is a control signal, and the output generates a linear driving signal.
In the embodiment, the output current of the power driving module and the vibration state signal of the mechanical structure to be damped are obtained, the control signal is generated by the numerical control module, and the linear driving signal is output by the linear power amplifier based on the control signal, so that the driving controller is ensured to have higher output linearity.
As a preferred embodiment of this embodiment, the linear power amplifier may be a PA93 amplifier of APEX corporation, which has the characteristics of high linearity and large output current; the current sensor of the current detection module can adopt a sensor of a DHAB A/14 model of an LEM company, the measurement precision is high, the response is fast, the vibration sensor of the vibration detection Mook can adopt a sensor of an LDT0-028K/L model of a TE company, and the precision can reach 50-800Mv/g.
Referring to fig. 2, as an alternative embodiment, the digital control module includes:
the analog-to-digital conversion circuit is used for receiving the output current and the vibration state signal of the power driving module and converting the output current and the vibration state signal of the power driving module into digital signals;
the digital control circuit is connected with the output end of the analog-to-digital conversion circuit and used for receiving the digital signal and generating an input voltage value required by the power driving module based on the digital signal; the Digital control circuit takes a Digital Signal Processor (DSP) as a main controller; the digital signal control circuit acquires an input signal required by the linear power amplifier according to the vibration state information, and controls the output current sharing of the linear power amplifier according to the output current of the power driving module; as a preferred scheme of this embodiment, the digital signal processor may use a model TMS320F28335, has a master frequency of 150MHz, a 32-bit floating point processing unit, and is low in power and rich in peripheral devices;
the digital-to-analog conversion circuit is connected with the output end of the digital control circuit and is used for receiving the input voltage value and converting the input voltage value into an analog signal; the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module; as a preferred scheme of this embodiment, a digital-to-analog converter of the digital-to-analog conversion circuit may use a 14-bit AD7835 digital-to-analog conversion new product;
and the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module through the isolation circuit, and the isolation circuit isolates the power driving module from the digital control module, so that the safety of the circuit is ensured.
Referring to fig. 1 and 2, as a preferred embodiment, the high-frequency high-efficiency driving controller of the piezoelectric actuator further includes:
the real-time following power supply module is used for providing power supply voltage for the power driving module, and the power supply voltage changes in real time according to the requirement of the power driving module;
the voltage detection module is used for acquiring the output voltage of the power driving module;
the PI adjusting module is used for acquiring a PWM control signal based on the output voltage of the power driving module;
the supply voltage changes in real time according to the requirements of the power driving module, comprising:
and the real-time following power supply module changes the voltage value of the output power supply voltage in real time according to the PWM control signal.
Referring to fig. 2, in the present embodiment, the power supply includes a positive dc regulated power supply V with positive and negative symmetry CC + and negative DC voltage-stabilized source V CC Correspondingly, the real-time follow-up power supply module supplies the power supply voltage to the power driving module also includes the positive power supply voltage V S + and a negative supply voltage V S -；
According to the embodiment of the invention, a traditional constant direct current power supply mode is changed into a real-time following power supply mode through a real-time following power supply module, the output voltage of a linear power amplifier is fed back through a voltage detection circuit, and the given voltage of the real-time following power supply is obtained based on the output voltage; the given voltages include a positive given voltage V1 and a negative given voltage V2.
The PI regulating module compares the current output voltage of the real-time following power supply module with a given voltage, and then generates a PWM (pulse-width modulation) wave through the PI regulator to control the on-off of a switching element, so that the power supply voltage V input to the control power amplifier S + and a negative supply voltage V S The real-time change of the output of the power amplifier is followed, so that the power amplifier is ensured to work in a state of outputting maximum undistorted voltage all the time, and the power loss of the power amplifier circuit is effectively reduced. Completing real-time follow-up power supply; therefore, on the premise of ensuring that the linear power amplifier always works in an undistorted state, the loss is reduced, and the problem that the linear power amplifier has larger loss is solved.
Referring to fig. 2 and 3, as an alternative implementation manner of the present embodiment, the real-time follow power supply module includes a positive power supply circuit and a negative power supply circuit that are symmetric in positive and negative;
the positive power supply circuit includes: the positive switch circuit is formed by connecting the first switch circuit and the second switch circuit in parallel, the power output end of the positive switch circuit is grounded through a first capacitor C1, and the power input end of the positive switch circuit is grounded through a second capacitor C2;
the first switch circuit comprises a first switch S1, a second switch S2 and a first inductor L1, the first switch S1 and the second switch S2 are connected in series, and one end of the first inductor L1 is connected to a connection point of the first switch S1 and the second switch S2;
the second switch circuit comprises a third switch S3, a fourth switch S4 and a second inductor L2, the third switch S3 and the fourth switch S4 are connected in series, and one end of the second inductor L2 is connected to the connection point of the third switch S3 and the fourth switch S4;
the other end of the first inductor L1 is connected with the other end of the second inductor L2 to serve as a power supply output end of the positive switch circuit;
the first switch S1 and the third switch S3 are connected as a power input terminal of the positive switch circuit.
The negative power supply circuit includes: the negative switch circuit is formed by connecting the third switch circuit and the fourth switch circuit in parallel, the power output end of the negative switch circuit is grounded through a third capacitor C3, and the power input end of the negative switch circuit is grounded through a fourth capacitor C4;
the third switch circuit comprises a fifth switch S5, a sixth switch S6 and a third inductor L3, wherein the fifth switch S5 is connected with the sixth switch S6 in series, and one end of the third inductor L3 is connected with the connection point of the fifth switch S5 and the sixth switch S6;
the fourth switching circuit comprises a seventh switch S7, an eighth switch S8 and a fourth inductor L4, the seventh switch S7 and the eighth switch S8 are connected in series, and one end of the fourth inductor L4 is connected to the connection point of the seventh switch S7 and the eighth switch S8;
the other end of the third inductor L3 is connected with the other end of the fourth inductor L4 to serve as a power supply output end of the negative switch circuit;
the fifth switch S5 and the seventh switch S7 are connected as a power supply input terminal of the negative switching circuit.
Positive power supply circuit of the present embodimentThe positive power supply voltage input by the positive power supply input end of the linear power amplifier is V S Negative supply voltage V input at negative supply input S -; the working process of the real-time following power supply module is as follows:
when the power driving module outputs positive voltage, the positive direct current stabilized voltage power supply V CC Supplying power, wherein when the output forward voltage rises, the first switch S1 and the third switch S3 are conducted in a staggered mode, the second switch S2 and the fourth switch S4 are conducted in a complementary mode to conduct follow current, current flows to the first capacitor C1 through the first inductor L1 and the second inductor L2 alternately by the first switch S1 and the third switch S3, when the output forward voltage falls, the second switch S2 and the fourth switch S4 are conducted in a staggered mode, the first switch S1 and the third switch S3 are conducted in a complementary mode, and current flows to the second capacitor C2 through the first capacitor C1 to achieve energy feedback;
when the power driving module outputs negative voltage, VCC-power supply is carried out, when the absolute value of the output negative voltage rises, the fifth switch S5 and the seventh switch S7 are conducted in a staggered mode, the sixth switch S6 and the eighth switch S8 carry out follow current, current flows to the third capacitor C3 through the third inductor L3 and the fourth inductor L4 alternately by the fifth switch S5 and the seventh switch S7, when the absolute value of the output negative voltage falls, the sixth switch S6 and the eighth switch S8 are conducted in a staggered mode, the fifth switch S5 and the seventh switch S7 carry out follow current, and current flows to the fourth capacitor C4 through the third capacitor C3 to realize energy feedback and finally complete real-time follow power supply of the power amplifier.
In order to reduce the switching loss of the circuit, in this embodiment, a wide bandgap power device is preferably used as the switching device, and in this embodiment, a silicon carbide MOSFET of a type such as C2M0025120D can be used as the switching device, which has the advantages of high switching speed, small on-resistance, and the like.
As a preferred embodiment of this embodiment, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are: a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET;
the grid electrode of the first MOSFET, the grid electrode of the second MOSFET, the grid electrode of the third MOSFET and the grid electrode of the fourth MOSFET are respectively connected with the output end of the PI regulation module;
the first switch S1 and the third switch S3 are connected as a power input terminal of the positive switch circuit, and include: the drain electrode of the first MOSFET is connected with the drain electrode of the third MOSFET to serve as the input end of the positive power supply circuit to be connected with the positive power supply;
the first switch S1 and the second switch S2 are connected in series, and one end of the first inductor L1 is connected to a connection point of the first switch S1 and the second switch S2, including: the source electrode of the first MOSFET is connected with the drain electrode of the second MOSFET and one end of the first inductor L1, and the source electrode of the second MOSFET is grounded;
the third switch S3 and the fourth switch S4 are connected in series, and one end of the second inductor L2 is connected to a connection point of the third switch S3 and the fourth switch S4, including: the source of the third MOSFET is connected to the drain of the fourth MOSFET and to one end of the second inductor L2, and the source of the fourth MOSFET is grounded.
The fifth switch S5, the sixth switch S6, the seventh switch S7, and the eighth switch S8 are: a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, and an eighth MOSFET;
the grid electrode of the fifth MOSFET, the grid electrode of the sixth MOSFET, the grid electrode of the seventh MOSFET and the grid electrode of the eighth MOSFET are respectively connected with the output end of the PI regulation module;
the fifth switch S5 and the seventh switch S7 are connected as a power input terminal of the negative switching circuit, and include: the drain electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET to serve as the input end of the negative power supply circuit to be connected with the negative power supply;
the fifth switch S5 and the sixth switch S6 are connected in series, and one end of the third inductor L3 is connected to a connection point of the fifth switch S5 and the sixth switch S6, including: the source electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET and one end of the third inductor L3, and the source electrode of the sixth MOSFET is grounded;
the seventh switch S7 and the eighth switch S8 are connected in series, and one end of the fourth inductor L4 is connected to a connection point of the seventh switch S7 and the eighth switch S8, and includes: the source of the seventh MOSFET is connected to the drain of the eighth MOSFET and to one end of the fourth inductor L4, and the source of the eighth MOSFET is connected to ground.
As a preferred embodiment of this embodiment, the power driving module includes: the plurality of linear power amplifiers are connected in parallel, so that the driving capability is improved;
fig. 2 shows a schematic circuit diagram of a two-linear power amplifier circuit; fig. 4 shows a schematic of the topology of the power driver module when the number of linear power amplifiers is two; the number of the real-time following power supply modules is consistent with that of the linear power amplifiers; at the moment, the first real-time positive power supply voltage output by the power supply module is V S1 A negative supply voltage of V S1 -for supplying a first linear power amplifier A1; the positive power supply voltage output by the second real-time following power supply module is V S2 A negative supply voltage of V S2 For supplying a second linear power amplifier A2;
referring to fig. 2, the number of the corresponding voltage detection modules and the number of the PI regulation modules are also consistent with the number of the linear power amplifiers; the voltage detection circuit of the first voltage detection module obtains the output voltage U of the first power amplifier out_1 Then, a first PWM signal used for being input into a first real-time following power supply module is generated through a first PI regulation module; the voltage detection circuit of the second voltage detection module obtains the output voltage U of the second power amplifier out_2 And then, a second PWM signal which is input into a second real-time following power supply module is generated through a second PI regulation module. Similarly, the number of the current detection modules is also the same as that of the linear power amplifiers, and the current detection circuit of the first current detection module is used for acquiring the output current I of the first power driving module 1 (ii) a The current detection circuit of the second current detection module is used for acquiring the output current I of the second power driving module 2 (ii) a The output end of the first power amplifier is connected with the output end of the first power amplifier and outputs a linear driving signal U to the piezoelectric actuator out (ii) a The digital control module respectively outputs a first control signal U to the first linear power amplifier in1 Outputting a second control signal U to a second linear power amplifier in2 。
According to the embodiment of the invention, the linear power amplifier is used as power drive, the output control signal has higher linearity, meanwhile, the problem of larger loss of the linear power amplifier is solved by using a real-time following power supply mode, a wide-bandgap power device is used as a switching device to reduce the switching loss of a circuit, a structure that a plurality of linear power amplifiers are connected in parallel is adopted, the driving capability is improved, and the driving function of the piezoelectric actuator with high frequency response and high efficiency is finally realized.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the method of the above embodiments may be implemented by hardware that is configured to be instructed to perform the relevant steps by a program, which may be stored in a computer-readable storage medium, and which, when executed, includes one or a combination of the steps of the method embodiments.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process. And the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., as a sequential list of executable instructions that may be thought of as being useful for implementing logical functions, may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
The terms "first", "second" … … "nth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second" … … "nth" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.
Claims (8)
1. A high frequency, high efficiency drive controller for a piezoelectric actuator, comprising:
the power driving module is used for generating a linear driving signal so as to drive the piezoelectric actuator to act;
the current detection module is used for acquiring the output current of the power driving module;
the vibration detection module is used for acquiring a vibration state signal of the mechanical structure to be damped;
the digital control module is used for generating a control signal based on the output current of the power driving module and the vibration state signal;
the real-time following power supply module is used for providing power supply voltage for the power driving module, and the power supply voltage changes in real time according to the requirement of the power driving module;
wherein the power driving module comprises a linear power amplifier; the input signal of the linear power amplifier is the control signal, and the linear drive signal is output and generated;
the real-time following power supply module comprises a positive power supply circuit;
the positive power supply circuit includes: the positive switch circuit is formed by connecting a first switch circuit and a second switch circuit in parallel, the power output end of the positive switch circuit is grounded through a first capacitor, and the power input end of the positive switch circuit is grounded through a second capacitor;
the first switch circuit comprises a first switch, a second switch and a first inductor, the first switch and the second switch are connected in series, and one end of the first inductor is connected to the connection point of the first switch and the second switch;
the second switch circuit comprises a third switch, a fourth switch and a second inductor, the third switch and the fourth switch are connected in series, and one end of the second inductor is connected to the connection point of the third switch and the fourth switch;
the other end of the first inductor is connected with the other end of the second inductor to serve as a power supply output end of the positive switch circuit;
the first switch and the third switch are connected to serve as a power input end of the positive switch circuit.
2. The drive controller of claim 1, wherein the digital control module comprises:
the analog-to-digital conversion circuit is used for receiving the output current of the power driving module and the vibration state signal and converting the output current of the power driving module and the vibration state signal into digital signals;
the digital control circuit is connected with the output end of the analog-to-digital conversion circuit and used for receiving the digital signal and generating an input voltage value required by the power driving module based on the digital signal;
the digital-to-analog conversion circuit is connected with the output end of the digital control circuit and is used for receiving the input voltage value and converting the input voltage value into an analog signal; and the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module.
3. The drive controller of claim 1, further comprising:
the voltage detection module is used for acquiring the output voltage of the power driving module;
the PI adjusting module is used for acquiring a PWM control signal based on the output voltage of the power driving module;
the power supply voltage changes in real time according to the requirements of the power driving module, and comprises the following steps:
and the real-time following power supply module changes the voltage value of the output power supply voltage in real time according to the PWM control signal.
4. The drive controller of claim 2, wherein the digital control module further comprises: and the output end of the digital-to-analog conversion circuit is connected with the input end of the power driving module through the isolation circuit.
5. The drive controller of claim 3, wherein the real-time follow-up power supply module comprises a negative power supply circuit;
the negative power supply circuit includes: the negative switch circuit is formed by connecting a third switch circuit and a fourth switch circuit in parallel, the power output end of the negative switch circuit is grounded through a third capacitor, and the power input end of the negative switch circuit is grounded through a fourth capacitor;
the third switch circuit comprises a fifth switch, a sixth switch and a third inductor, the fifth switch is connected with the sixth switch in series, and one end of the third inductor is connected to the connection point of the fifth switch and the sixth switch;
the fourth switching circuit comprises a seventh switch, an eighth switch and a fourth inductor, the seventh switch and the eighth switch are connected in series, and one end of the fourth inductor is connected to a connection point of the seventh switch and the eighth switch;
the other end of the third inductor is connected with the other end of the fourth inductor to serve as a power supply output end of the negative switch circuit;
the fifth switch and the seventh switch are connected as a power input end of the negative switch circuit.
6. The drive controller of claim 5,
the first switch, the second switch, the third switch and the fourth switch are respectively: a first MOSFET, a second MOSFET, a third MOSFET and a fourth MOSFET;
the grid electrode of the first MOSFET, the grid electrode of the second MOSFET, the grid electrode of the third MOSFET and the grid electrode of the fourth MOSFET are respectively connected with the output end of the PI regulation module;
the first switch and the third switch are connected to serve as a power input end of the positive switch circuit, and the positive switch circuit comprises: the drain electrode of the first MOSFET is connected with the drain electrode of the third MOSFET to serve as the input end of the positive power supply circuit to be connected with a positive power supply;
the first switch and the second switch are connected in series, and one end of the first inductor is connected to a connection point of the first switch and the second switch, including: the source electrode of the first MOSFET is connected with the drain electrode of the second MOSFET and one end of the first inductor, and the source electrode of the second MOSFET is grounded;
the third switch and the fourth switch are connected in series, and one end of the second inductor is connected to a connection point of the third switch and the fourth switch, including: and the source electrode of the third MOSFET is connected with the drain electrode of the fourth MOSFET and one end of the second inductor, and the source electrode of the fourth MOSFET is grounded.
7. The drive controller of claim 6, wherein the real-time follow-up power supply module comprises a negative power supply circuit;
the fifth switch, the sixth switch, the seventh switch, and the eighth switch are respectively: a fifth MOSFET, a sixth MOSFET, a seventh MOSFET, and an eighth MOSFET;
the grid electrode of the fifth MOSFET, the grid electrode of the sixth MOSFET, the grid electrode of the seventh MOSFET and the grid electrode of the eighth MOSFET are respectively connected with the output end of the PI regulation module;
the fifth switch and the seventh switch are connected as a power input end of the negative switch circuit, and the negative switch circuit comprises: the drain electrode of the fifth MOSFET is connected with the drain electrode of the seventh MOSFET to serve as the input end of the negative power supply circuit to be connected with the negative power supply;
the fifth switch is connected in series with the sixth switch, and one end of the third inductor is connected to a connection point of the fifth switch and the sixth switch, including: the source electrode of the fifth MOSFET is connected with the drain electrode of the sixth MOSFET and one end of the third inductor, and the source electrode of the sixth MOSFET is grounded;
the seventh switch and the eighth switch are connected in series, and one end of the fourth inductor is connected to a connection point of the seventh switch and the eighth switch, including: and the source electrode of the seventh MOSFET is connected with the drain electrode of the eighth MOSFET and one end of the fourth inductor, and the source electrode of the eighth MOSFET is grounded.
8. The drive controller of any one of claims 1-7, wherein the power drive module comprises: a plurality of linear power amplifiers connected in parallel.
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| CN202110276851.9A CN113037131B (en) | 2021-03-15 | 2021-03-15 | High-frequency high-efficiency driving controller of piezoelectric actuator |
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| CN202110276851.9A CN113037131B (en) | 2021-03-15 | 2021-03-15 | High-frequency high-efficiency driving controller of piezoelectric actuator |
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| IT1318880B1 (en) * | 2000-09-19 | 2003-09-10 | St Microelectronics Srl | ELECTRONIC CIRCUIT FOR PILOTING WITH HIGH EFFICIENCY OF ELECTRIC LOADS WITH INDUCTIVE-RESISITIVE WIRING. |
| CN204089637U (en) * | 2013-11-21 | 2015-01-07 | 王军 | The driving power of electrical micro-machine |
| CN104601040B (en) * | 2014-12-26 | 2017-01-04 | 北京理工大学 | A kind of hybrid driver circuit for piezoelectric ceramics of switched linear |
| CN106787939B (en) * | 2017-03-06 | 2019-06-18 | 北京卫星制造厂 | A kind of high-precision drive control device of piezoelectric ceramic ultrasonic motor |
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