Piezoelectric Ceramic Drive Circuit and Vibration Damping System

Abstract

The present application relates to a piezoelectric ceramic drive circuit and a vibration damping system, including a comparison circuit and a drive enhancement circuit; the comparison circuit is configured to receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the input signal with the carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit; the drive enhancement circuit is configured to receive a power supply signal, and charge and discharge the piezoelectric ceramic through the power supply signal and the pulse width modulation signal, so as to enable the drive enhancement circuit to output a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic. In this way, by modulating the input signal to obtain a pulse width modulation signal, it is possible to control the output magnitude of the high-voltage power supply signal through the pulse width modulation signal, thereby achieving high-power drive. Moreover, the piezoelectric ceramic drive circuit does not need to rely on a high-voltage integrated operational amplifier, thus reducing the cost, simplifying the implementation process of high-power piezoelectric ceramic drive, and broadening the product application scenarios.

Description

Technical Field

[0001] This application relates to the technical field of piezoelectric ceramic drive control, and particularly to a piezoelectric ceramic drive circuit and a vibration damping system. Background Art

[0002] Piezoelectric ceramics are ceramic materials that can convert mechanical energy and electrical energy into each other and have the inverse piezoelectric effect. When a piezoelectric ceramic material is placed in an external electric field, the piezoelectric body generates corresponding stress and strain phenomena while being polarized, thereby realizing operation, which enables it to be applied to vibration excitation systems or vibration damping systems in various microelectromechanical systems.

[0003] In the prior art, piezoelectric ceramics are usually driven and controlled by a high-voltage drive circuit. The high-voltage drive circuit can input a relatively high voltage to meet the drive requirements of piezoelectric ceramics. However, the proportional amplifier circuit in the high-voltage drive circuit usually selects a high-voltage integrated operational amplifier processed by a special process. Most of these amplifiers are single-chip designs, with high costs. And because the chip integrates multiple components together, the components on the chip are too dense, which in turn affects the heat dissipation effect.

[0004] Therefore, although the piezoelectric ceramic drive circuit in the prior art can realize the drive of medium-power piezoelectric ceramics, due to the limited working voltage of electronic components and the lack of support for high-power electronic components, it is difficult to realize a high-power piezoelectric ceramic drive circuit. Summary of the Invention

[0005] The purpose of this application is to provide a piezoelectric ceramic drive circuit and a vibration damping system, so as to solve the problem that it is difficult to realize the drive of high-power piezoelectric ceramics in the prior art, thereby expanding its application scenarios.

[0006] An embodiment of this application provides a piezoelectric ceramic drive circuit, which includes a comparison circuit and a drive enhancement circuit; wherein, the comparison circuit is connected to the drive enhancement circuit, and the comparison circuit is configured to: receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit; the drive enhancement circuit is connected to the piezoelectric ceramic, and the drive enhancement circuit is configured to: receive a power supply signal, and charge and discharge the piezoelectric ceramic through the received power supply signal and the pulse width modulation signal transmitted by the comparison circuit, so as to realize that the drive enhancement circuit outputs a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic.

[0007] Among them, the driving enhancement circuit includes: a power amplification control circuit and a power amplification circuit; wherein, the power amplification control circuit is connected to the power amplification circuit, and the power amplification control circuit is configured to: when the pulse width modulation signal transmitted by the comparison circuit is at a high level, transmit a first control signal to the power amplification circuit, and when the pulse width modulation signal transmitted by the comparison circuit is at a low level, transmit a second control signal to the power amplification circuit; the power amplification circuit is connected to the piezoelectric ceramic, and the power amplification circuit is configured to: receive a power supply signal; when receiving the first control signal transmitted by the power amplification control circuit, transmit the received power supply signal to the piezoelectric ceramic to charge the piezoelectric ceramic; when receiving the second control signal transmitted by the power amplification control circuit, stop transmitting the power supply signal to the piezoelectric ceramic and cause the piezoelectric ceramic to supply power to the load to discharge the piezoelectric ceramic.

[0008] Among them, the power amplification circuit includes: a first controllable switch and a second controllable switch; wherein, the control end of the first controllable switch and the control end of the second controllable switch are both connected to the power amplification control circuit, the first end of the first controllable switch receives the power supply signal, the second end of the first controllable switch is connected to the first end of the piezoelectric ceramic, the first end of the second controllable switch is connected to the first end of the piezoelectric ceramic, the second end of the second controllable switch is connected to the first end of the load, and the second end of the load and the second end of the piezoelectric ceramic are both grounded; and, when the power amplification control circuit executes that when the pulse width modulation signal transmitted by the comparison circuit is at a high level, transmit a first control signal to the power amplification circuit, and when the pulse width modulation signal transmitted by the comparison circuit is at a low level, transmit a second control signal to the power amplification circuit, it specifically executes: when the pulse width modulation signal transmitted by the comparison circuit is at a high level, transmit a first control signal to the control end of the first controllable switch to turn on the first controllable switch, and when the pulse width modulation signal transmitted by the comparison circuit is at a low level, transmit a second control signal to the control end of the first controllable switch to turn off the second controllable switch; the power amplification control circuit is further configured to: when the pulse width modulation signal transmitted by the comparison circuit is at a high level, transmit a third control signal to the control end of the second controllable switch to turn off the second controllable switch, and when the pulse width modulation signal transmitted by the comparison circuit is at a low level, transmit a fourth control signal to the control end of the second controllable switch to turn on the second controllable switch.

[0009] Among them, both the first controllable switch and the second controllable switch are switching tubes; the power amplification control circuit is a half-bridge switching circuit.

[0010] Among them, when the comparison circuit generates a pulse-width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, it specifically performs: when the received input signal is greater than the received carrier signal, the received input signal is transformed into a preset high level, and when the received input signal is less than or equal to the received carrier signal, the received input signal is transformed into a preset low level, so as to realize the transformation of the input signal into a pulse-width modulation signal corresponding to the input signal.

[0011] Among them, the piezoelectric ceramic drive circuit further includes: a feedback loop and an amplification compensation circuit; wherein, the feedback loop is connected to the amplification compensation circuit, and the feedback loop is configured to: feedback the drive signal output by the drive enhancement circuit to the piezoelectric ceramic to the amplification compensation circuit; the amplification compensation circuit is connected to the comparison circuit, and the amplification compensation circuit is configured to: receive the initial input signal; perform amplification compensation processing on the received initial input signal according to the feedback signal of the feedback loop to obtain the input signal, and transmit the input signal to the comparison circuit.

[0012] Among them, the piezoelectric ceramic drive circuit further includes: a carrier signal generator, the carrier signal generator is connected to the comparison circuit, and the carrier signal generator is configured to: generate a carrier signal according to preset carrier parameters, and transmit the carrier signal to the comparison circuit.

[0013] Among them, the input signal is a sine wave signal; the carrier signal is a triangular wave signal.

[0014] Among them, the piezoelectric ceramic drive circuit further includes: an input power supply and a step-up transformer; wherein, the input power supply is connected to the step-up transformer, and the input power supply is configured to provide an initial power signal to the step-up transformer; the step-up transformer is connected to the drive enhancement circuit, and the step-up transformer is configured to: step up the received initial power signal to obtain a power signal, and transmit the power signal to the drive enhancement circuit.

[0015] Among them, the piezoelectric ceramic drive circuit further includes: a second filter, and the second filter is connected between the step-up transformer and the drive enhancement circuit.

[0016] Among them, the piezoelectric ceramic drive circuit further includes: a first filter, and the first filter is connected between the drive enhancement circuit and the piezoelectric ceramic.

[0017] Among them, the first filter includes: an inductor and a resistor, wherein, the first end of the inductor is electrically connected to the drive enhancement circuit, the second end of the inductor is electrically connected to the piezoelectric ceramic, the first end of the resistor is electrically connected to the first end of the inductor, and the second end of the resistor is grounded.

[0018] Among them, the comparison circuit is a comparator.

[0019] An embodiment of the present application further provides a vibration damping system, which includes the piezoelectric ceramic drive circuit of any one of the above.

[0020] The beneficial effects of the present application are as follows: The piezoelectric ceramic drive circuit and the vibration damping system provided by the present application, the piezoelectric ceramic drive circuit can be applied to the vibration damping system, and includes a comparison circuit and a drive enhancement circuit, wherein the comparison circuit is connected to the drive enhancement circuit, and the drive enhancement circuit is connected to the piezoelectric ceramic; and, the comparison circuit is configured to receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit; the drive enhancement circuit is configured to receive a power supply signal, and charge and discharge the piezoelectric ceramic through the received power supply signal and the pulse width modulation signal transmitted by the comparison circuit, so as to realize that the drive enhancement circuit outputs a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic. In this way, during the process of the piezoelectric ceramic drive circuit driving the piezoelectric ceramic to work, by modulating the input signal to obtain a pulse width modulation signal, it is possible to control the output magnitude of the high-voltage power supply signal through the pulse width modulation signal, thereby realizing high-power drive, and the piezoelectric ceramic drive circuit does not need to rely on a high-voltage integrated operational amplifier, so it can effectively solve the problem that it is difficult to achieve high-power drive in the existing piezoelectric ceramic drive circuit due to the limited working voltage of electronic components and the lack of support for high-power electronic components. This not only reduces the product cost, but also simplifies the implementation process of high-power piezoelectric ceramic drive and broadens the application scenarios of the product. Description of the Drawings

[0021] The following will make the technical solutions and other beneficial effects of the present application obvious by describing the specific embodiments of the present application in detail with reference to the drawings.

[0022] Figure 1 is a schematic structural diagram of the piezoelectric ceramic drive circuit provided by an embodiment of the present application;

[0023] Figure 2 is a timing diagram of the piezoelectric ceramic drive circuit provided by an embodiment of the present application;

[0024] Figure 3 is another schematic structural diagram of the piezoelectric ceramic drive circuit provided by an embodiment of the present application;

[0025] Figure 4 is another schematic structural diagram of the piezoelectric ceramic drive circuit provided by an embodiment of the present application;

[0026] Figure 5 is another schematic structural diagram of the piezoelectric ceramic drive circuit provided by an embodiment of the present application;

[0027] Figure 6It is the equivalent circuit diagram when the piezoelectric ceramic drive circuit provided by the embodiment of the present application charges the piezoelectric ceramic;

[0028] Figure 7 It is the equivalent circuit diagram when the piezoelectric ceramic drive circuit provided by the embodiment of the present application discharges the piezoelectric ceramic;

[0029] Figure 8 It is another structural schematic diagram of the piezoelectric ceramic drive circuit provided by the embodiment of the present application. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0033] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include contact between the first and second features through additional features therebetween rather than direct contact. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0034] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0035] The following is a detailed description in conjunction with specific embodiments. It should be noted that the serial numbers of the following embodiments do not limit the preferred order of the embodiments.

[0036] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a piezoelectric ceramic drive circuit provided by an embodiment of this application. As Figure 1 shown, the piezoelectric ceramic drive circuit 100 includes a comparison circuit 101 and a drive enhancement circuit 102. Among them, the comparison circuit 101 is connected to the drive enhancement circuit 102, and the drive enhancement circuit 102 is connected to the piezoelectric ceramic 200. And the comparison circuit 101 is configured to: receive an input signal Ve and a carrier signal Vc, generate a pulse width modulation signal PWM corresponding to the input signal Ve by comparing the received input signal Ve with the received carrier signal Vc, and transmit the pulse width modulation signal PWM to the drive enhancement circuit 102. The drive enhancement circuit 102 is configured to: receive a power supply signal Vp, and charge and discharge the piezoelectric ceramic 200 through the received power supply signal Vp and the pulse width modulation signal PWM transmitted by the comparison circuit 101, so as to enable the drive enhancement circuit 102 to output a drive signal Vo corresponding to the pulse width modulation signal PWM to the piezoelectric ceramic 200.

[0037] Among them, the input signal Ve is used to control the magnitude of the driving signal Vo output by the piezoelectric ceramic driving circuit 100 to the piezoelectric ceramic 200. The driving signal Vo is less than or equal to the power supply signal Vp. The power supply signal Vp can be a high-voltage power supply signal and can be a fixed value, and the value range of the fixed value can be 800 - 1200V. Exemplarily, the power supply signal Vp can be specifically 1000V. The piezoelectric ceramic 200 can be specifically a piezoelectric ceramic actuator or a piezoelectric stack ceramic.

[0038] In this embodiment, the ratio of the driving signal Vo to the power supply signal Vp can change with the duty cycle of the pulse width modulation signal PWM, and the duty cycle of the pulse width modulation signal PWM can change with the difference between the input signal Ve and the carrier signal Vc. Thus, by changing the input signal Ve and / or the carrier signal Vc, it is possible to change the duty cycle of the pulse width modulation signal PWM generated by the comparison circuit 101, so that when the power supply signal Vp remains fixed, it is possible to adjust the magnitude of the driving signal Vo output by the driving enhancement circuit 102 to the piezoelectric ceramic 200 to meet the driving requirements of the piezoelectric ceramic 200.

[0039] Specifically, in the above piezoelectric ceramic driving circuit 100, the ratio of the driving signal Vo to the power supply signal Vp can be equal to the duty cycle of the pulse width modulation signal PWM, so that the driving signal Vo output by the piezoelectric ceramic driving circuit 100 to the piezoelectric ceramic 200 can be linearly regulated by the input signal Ve.

[0040] It should be noted that in the above piezoelectric ceramic driving circuit 100, the pulse width modulation signal PWM can be a digital signal composed of a high level and a low level, and the time ratio of the high level and the low level can be adjusted to achieve the control of the driving signal Vo. And the duty cycle of the pulse width modulation signal PWM can refer to the ratio of the time of its high level to its total cycle time (i.e., the sum of the time of its high level and the time of its low level).

[0041] Specifically, in the above piezoelectric ceramic driving circuit 100, the input signal Ve and the carrier signal Vc can both be analog signals. And the carrier signal Vc can be preset and will not change with the driving requirements of the piezoelectric ceramic 200. The input signal Ve can be set according to the actual driving requirements of the piezoelectric ceramic 200, that is, the input signal Ve will change with the driving requirements of the piezoelectric ceramic 200. Thus, taking the carrier signal Vc as a reference, by changing the input signal Ve, it is possible to control the driving signal Vo output by the piezoelectric ceramic driving circuit 100 to the piezoelectric ceramic 200.

[0042] Moreover, in specific implementation, when the above-mentioned comparison circuit 101 generates a pulse-width modulation signal PWM corresponding to the input signal Ve by comparing the received input signal Ve with the received carrier signal Vc, it can specifically execute: when the received input signal Ve is greater than the received carrier signal Vc, convert the received input signal Ve into a preset high level, and when the received input signal Ve is less than or equal to the received carrier signal Vc, convert the received input signal Ve into a preset low level, so as to realize converting the input signal Ve into a pulse-width modulation signal PWM corresponding to the input signal Ve. Among them, the preset high level is greater than the preset low level, and the pulse-width modulation signal PWM can specifically be a digital signal composed of the preset high level and the preset low level, and the time of its high level can specifically refer to the time of its preset high level, and the time of its low level can specifically refer to the time of its preset low level.

[0043] Exemplarily, the above-mentioned input signal Ve can specifically be a sine wave signal. For example, specifically, it can be Figure 2 the sine wave signal shown in. The above-mentioned carrier signal Vc can specifically be a triangular wave signal. For example, specifically, it can be Figure 2 the triangular wave signal shown in. The process of the above-mentioned comparison circuit 101 comparing the sine wave signal with the triangular wave signal can be as shown in Figure 2 and the pulse-width modulation signal PWM generated in this process can specifically be Figure 2 the pulse-width modulation signal shown in.

[0044] Specifically, in the above-mentioned piezoelectric ceramic driving circuit 100, the comparison circuit 101 can have two input terminals (i.e., the first input terminal and the second input terminal) and one output terminal, and the driving enhancement circuit 102 can have two input terminals (i.e., the first input terminal and the second input terminal) and one output terminal. Among them, the first input terminal of the comparison circuit 101 can be used to receive the input signal Ve, the second input terminal of the comparison circuit 101 can be used to receive the carrier signal Vc, the output terminal of the comparison circuit 101 can be electrically connected to the first input terminal of the driving enhancement circuit 102, the second input terminal of the driving enhancement circuit 102 can be used to receive the power supply signal Vp, and the output terminal of the driving enhancement circuit 102 can be electrically connected to the piezoelectric ceramic 200. In this way, it can be realized that the comparison circuit 101 transmits the generated pulse-width modulation signal PWM to the first input terminal of the driving enhancement circuit 102 through its output terminal, so that the driving enhancement circuit 102 receives the pulse-width modulation signal PWM, and it can be realized that the driving enhancement circuit 102 outputs a driving signal Vo to the piezoelectric ceramic 200 through its output terminal.

[0045] Exemplarily, as shown in Figure 3As shown, in the above piezoelectric ceramic drive circuit 100, the comparison circuit 101 can specifically be a comparator 101, and the first input terminal and the second input terminal of the comparison circuit 101 can be the positive input terminal and the negative input terminal of the comparator 101 respectively. In this way, by adopting the fast response mode of the comparator 101 to process the input signal Ve, the signal processing delay can be reduced.

[0046] In some embodiments, as Figure 3 shown, the above piezoelectric ceramic drive circuit 100 may further include a carrier signal generator 103. The carrier signal generator 103 is connected to the comparison circuit 101 (for example, the second input terminal of the comparison circuit 101), and the carrier signal generator 103 may be configured to: generate a carrier signal Vc according to preset carrier parameters, and transmit the carrier signal Vc to the comparison circuit 101.

[0047] In some specific embodiments, the above carrier signal Vc may specifically be a triangular wave signal, and the above carrier signal generator 103 may specifically be a triangular wave signal generator 103 (as Figure 4 shown). Moreover, the triangular wave signal generator 103 may specifically be configured to: generate a triangular wave signal according to preset triangular wave parameters, and transmit the triangular wave signal as the carrier signal Vc to the comparison circuit 101. Among them, the triangular wave parameters may include the period of the triangular wave, the amplitude of the triangular wave, and the symmetry of the triangular wave, etc.

[0048] In some embodiments, as Figure 3 shown, the piezoelectric ceramic drive circuit 100 may further include an amplification circuit 104. The amplification circuit 104 is connected to the comparison circuit 101 (for example, the first input terminal of the comparison circuit 101). And the amplification circuit 104 may be configured to: receive the initial input signal Ve'; perform amplification processing on the received initial input signal Ve' to obtain the input signal Ve, and transmit the input signal Ve to the comparison circuit 101. In this way, by amplifying the initial input signal Ve' and then transmitting it to the comparison circuit 101, high-power drive (such as high-voltage drive) of the piezoelectric ceramic 200 can be achieved when the initial input signal Ve' is very small.

[0049] Specifically, when the amplifier circuit 104 performs amplification processing on the received initial input signal Ve' to obtain the input signal Ve, it can specifically perform: amplifying the received initial input signal Ve' according to a specified amplification ratio, and the amplified signal is the input signal Ve. Among them, the specified ratio can be determined by the amplitude of the initial input signal Ve' and the amplitude of the carrier signal Vc. Exemplarily, the preset ratio can be equal to the ratio of the amplitude of the carrier signal Vc to the amplitude of the initial input signal Ve', so as to ensure that the amplitude of the amplified signal (i.e., the input signal Ve) can be consistent with the amplitude of the carrier signal Vc. In this way, not only can high-power driving (such as high-voltage driving) of the piezoelectric ceramic 200 be achieved when the initial input signal Ve' is very small, but also the accuracy of the comparison result obtained when the comparison circuit 101 compares the input signal Ve with the carrier signal Vc can be improved.

[0050] In the above embodiment, as Figure 3 shown, in the above piezoelectric ceramic driving circuit 100, the driving enhancement circuit 102 may include a power amplification control circuit 1021 and a power amplification circuit 1022. Among them, the power amplification control circuit 1021 is connected to the power amplification circuit 1022, and the power amplification circuit 1022 is connected to the piezoelectric ceramic 200.

[0051] Moreover, the power amplification control circuit 1021 can be configured to: when the pulse width modulation signal PWM transmitted by the comparison circuit 101 is at a high level (such as the above preset high level), transmit a first control signal to the power amplification circuit 1022, and when the pulse width modulation signal PWM transmitted by the comparison circuit 101 is at a low level (such as the above preset low level), transmit a second control signal to the power amplification circuit 1022. The power amplification circuit 1022 can be configured to: receive the power supply signal Vp; when receiving the first control signal transmitted by the power amplification control circuit 1021, transmit the received power supply signal Vp to the piezoelectric ceramic 200 to charge the piezoelectric ceramic 200; when receiving the second control signal transmitted by the power amplification control circuit 1021, stop transmitting the power supply signal Vp to the piezoelectric ceramic 200 and enable the piezoelectric ceramic 200 to supply power to the load to discharge the piezoelectric ceramic 200. In this way, by performing charge and discharge operations on the piezoelectric ceramic 200, the voltage across the piezoelectric ceramic 200 can be adjusted to the required voltage.

[0052] In some specific embodiments, such as Figure 5As shown, in the above piezoelectric ceramic drive circuit 100, the power amplifier circuit 1022 may include a first controllable switch Q1 and a second controllable switch Q2. Among them, the control terminals of the first controllable switch Q1 and the second controllable switch Q2 may both be connected to the power amplifier control circuit 1021. The first terminal of the first controllable switch Q1 may receive a power supply signal Vp. The second terminal of the first controllable switch Q1 may be connected to the first terminal of the piezoelectric ceramic 200. The first terminal of the second controllable switch Q2 may be connected to the first terminal of the piezoelectric ceramic 200. The second terminal of the second controllable switch Q2 may be connected to the first terminal of the load R1. The second terminal of the load R1 and the second terminal of the piezoelectric ceramic 200 may both be grounded.

[0053] Moreover, when the power amplifier control circuit 1021 executes that when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a high level, it transmits a first control signal to the power amplifier circuit 1022, and when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a low level, it transmits a second control signal to the power amplifier circuit 1022, it may specifically execute: when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a high level (for example, the above-mentioned preset high level), it transmits a first control signal to the control terminal of the first controllable switch Q1 to turn on the first controllable switch Q1, and when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a low level (for example, the above-mentioned preset low level), it transmits a second control signal to the control terminal of the first controllable switch Q1 to turn off the second controllable switch Q2.

[0054] Specifically, the power amplifier control circuit 1021 may further be configured to: when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a high level (for example, the above-mentioned preset high level), it transmits a third control signal to the control terminal of the second controllable switch Q2 to turn off the second controllable switch Q2, and when the pulse width modulation signal PWM transmitted by the comparison circuit 101 received is at a low level (for example, the above-mentioned preset low level), it transmits a fourth control signal to the control terminal of the second controllable switch Q2 to turn on the second controllable switch Q2.

[0055] In this way, during the operation of the piezoelectric ceramic drive circuit 100 driving the piezoelectric ceramic 200, it can be realized that when the pulse width modulation signal PWM output by the comparison circuit 101 is at a high level (for example, the above-mentioned preset high level), the first controllable switch Q1 is turned on and the second controllable switch Q2 is turned off, so that the power supply signal Vp can charge the piezoelectric ceramic 200, thereby realizing the elevation of the voltage at the first end of the piezoelectric ceramic 200 (as Figure 6 shown), and Figure 6The direction of the arrow in the figure indicates the direction of the current. When the pulse-width modulation signal PWM output by the comparison circuit 101 is at a low level (for example, the above-mentioned preset low level), the first controllable switch Q1 is turned off and the second controllable switch Q2 is turned on, so that the power supply signal Vp no longer charges the piezoelectric ceramic 200, and the piezoelectric ceramic 200 can supply power to the load R1 through discharging, thereby realizing the reduction of the voltage at the first end of the piezoelectric ceramic 200 (as Figure 7 shown), and Figure 7 the direction of the arrow in the figure indicates the direction of the current. Therefore, it is possible to adjust the voltage across the piezoelectric ceramic 200 to the required voltage.

[0056] Exemplarily, as Figure 5 shown, the above-mentioned first controllable switch Q1 can be a switching tube Q1. And in specific implementation, as Figure 5 shown, the switching tube Q1 can specifically be a field-effect transistor Q1. The above-mentioned first control signal can specifically be a voltage signal, and its corresponding voltage value is greater than the threshold voltage of the field-effect transistor Q1. The above-mentioned second control signal can also be a voltage signal, and its corresponding voltage value is not greater than the threshold voltage of the field-effect transistor Q1.

[0057] Exemplarily, as Figure 5 shown, the above-mentioned second controllable switch Q2 can be a switching tube Q2. And in specific implementation, as Figure 5 shown, the switching tube Q2 can specifically be a field-effect transistor Q2. The above-mentioned third control signal can specifically be a voltage signal, and its corresponding voltage value is greater than the threshold voltage of the field-effect transistor Q2. The above-mentioned fourth control signal can also be a voltage signal, and its corresponding voltage value is not greater than the threshold voltage of the field-effect transistor Q2.

[0058] Exemplarily, as Figure 5 shown, the above-mentioned power amplification control circuit 1021 can specifically be a half-bridge switching circuit 1021. And in specific implementation, the specific structure of the half-bridge switching circuit 1021 can refer to the specific structure of the half-bridge switching circuit in the prior art, so it will not be elaborated here.

[0059] Exemplarily, as Figure 5 shown, the above-mentioned load R1 can specifically be a resistor R1. And in specific implementation, the resistance value of the resistor R1 can be flexibly set according to actual needs.

[0060] And it should be noted that, taking Figure 5Taking the circuit structure shown as an example, in the embodiment of the present application, by adopting the fast response mode of the comparator 104 to process the input signal Ve, the signal processing delay can be reduced, and through the high-speed switching ability of the power switch tube, the control loop bandwidth can be enhanced, so that it can meet the requirement that the output voltage (i.e., the driving signal Vo) changes with the rapid change of the input voltage (i.e., the input signal Ve), without affecting the loop bandwidth at the same time. Thus, a high-bandwidth and fast-response high-voltage driving power supply is provided, whose output voltage can be linearly regulated by the input signal Ve, with low delay, and the output voltage does not jump and fluctuate due to the supply voltage.

[0061] In some embodiments, as Figure 4 shown, the above piezoelectric ceramic driving circuit 100 may further include a filter (i.e., the first filter 105). The first filter 105 is connected between the driving enhancement circuit 102 and the piezoelectric ceramic 200, and can effectively filter the driving signal Vo transmitted between the driving enhancement circuit 102 and the piezoelectric ceramic 200, thereby improving the quality of the driving signal Vo.

[0062] Specifically, as Figure 5 shown, in the above piezoelectric ceramic driving circuit 100, the first filter 105 may include an inductor L and a resistor R2. Wherein, the first end of the inductor L is electrically connected to the driving enhancement circuit 102, the second end of the inductor L is electrically connected to the piezoelectric ceramic 200, the first end of the resistor R2 is electrically connected to the first end of the inductor L, and the second end of the resistor R2 is grounded.

[0063] Specifically, taking Figure 5 the circuit structure shown as an example, the first end of the inductor L may be specifically electrically connected to the second end of the first controllable switch Q1 in the driving enhancement circuit 102.

[0064] In the above embodiment, as Figure 8 shown, the above piezoelectric ceramic driving circuit 100 may further include an input power supply 106 and a boost transformer 107. Wherein, the input power supply 106 is connected to the boost transformer 107, and the boost transformer 107 is connected to the driving enhancement circuit 102 (for example, the second input end of the driving enhancement circuit 102). And, the input power supply 106 is configured to provide an initial power signal Vp' to the boost transformer 107. The boost transformer 107 is configured to: boost the received initial power signal Vp' to obtain a power signal Vp, and transmit the power signal Vp to the driving enhancement circuit 102.

[0065] Among them, the initial power supply signal Vp' is less than the power supply signal Vp, and the initial power supply signal Vp' and the power supply signal Vp can be the low-voltage power supply signal Vp' and the high-voltage power supply signal Vp respectively. Exemplarily, the initial power supply signal Vp' can be 12V, 24V or 48V, and the power supply signal Vp can be 800V, 1000V or 1200V. The input power supply 106 can be a DC input power supply. For example, it can be specifically a 48V DC input power supply, which is used to provide a voltage of 48V as the initial power supply signal Vp'.

[0066] Specifically, in the above piezoelectric ceramic drive circuit 100, when the boost transformer 107 boosts the received initial power supply signal Vp' to obtain the power supply signal Vp, it can specifically perform: boosting the received initial power supply signal Vp' according to a preset boost ratio, and the boosted signal is the power supply signal Vp. Among them, the preset boost ratio can be flexibly set according to actual needs. For example, when the initial power supply signal Vp' is 48V, the preset boost ratio can be set to 1000 / 48. Then, after the boost transformer 107 boosts the 48V initial power supply signal Vp' according to the preset boost ratio of 1000 / 48 times, the obtained power supply signal Vp is 1000V. Of course, the preset boost ratio is not limited to 1000 / 48, and can be flexibly adjusted according to factors such as the working voltage requirements of the piezoelectric ceramic 200 and the boosting ability of the boost transformer 107. By boosting the initial power supply signal Vp' through the boost transformer 107, a power supply signal Vp that meets the working requirements of the piezoelectric ceramic 200 can be obtained, thereby providing a stable and efficient high-voltage drive power supply for the piezoelectric ceramic.

[0067] Exemplarily, in the above piezoelectric ceramic drive circuit 100, the boost transformer 107 can specifically be a flyback switching power supply.

[0068] In some embodiments, as Figure 8 shown, the above piezoelectric ceramic drive circuit 100 may further include another filter (i.e., the second filter 108). The second filter 108 is connected between the boost transformer 107 and the drive enhancement circuit 102, and can effectively filter the power supply signal Vp transmitted between the boost transformer 107 and the drive enhancement circuit 102, thereby improving the quality of the power supply signal Vp.

[0069] Specifically, taking Figure 5 the shown circuit structure as an example, one end of the second filter 108 can be electrically connected to the boost transformer 107, and the other end of the second filter 108 can be electrically connected to the first end of the first controllable switch Q1 in the drive enhancement circuit 102.

[0070] In the above embodiments where the piezoelectric ceramic drive circuit 100 further includes the amplifier circuit 104, asFigure 8 As shown, the amplifying circuit 104 can specifically be an amplifying and compensating circuit 104, and the piezoelectric ceramic driving circuit 100 further includes a feedback loop 109 connected to the amplifying and compensating circuit 104. Moreover, the feedback loop 109 is configured to feedback the driving signal Vo output by the driving enhancement circuit 102 to the piezoelectric ceramic 200 to the amplifying and compensating circuit 104. The amplifying and compensating circuit 104 can specifically be configured to: receive the initial input signal Ve'; perform amplifying and compensating processing on the received initial input signal according to the feedback signal of the feedback loop 109 to obtain an input signal, and transmit the input signal to the comparison circuit.

[0071] Wherein, the feedback signal of the feedback loop 109 can be the signal obtained by dividing the driving signal Vo output by the driving enhancement circuit 102 by a preset voltage division ratio through the feedback loop 109. Specifically, the feedback signal is less than the driving signal Vo, and the ratio of the feedback signal to the driving signal Vo can be equal to the preset voltage division ratio. Moreover, in specific implementation, the feedback loop 109 can include a resistor, and the feedback signal of the feedback loop 109 can be the signal obtained by dividing the driving signal Vo output by the driving enhancement circuit 102 by this resistor.

[0072] Specifically, when the amplifying and compensating circuit 104 performs amplifying and compensating processing on the received initial input signal according to the feedback signal of the feedback loop 109 to obtain an input signal, it can specifically perform: determining a compensation factor according to the feedback signal of the feedback loop 109, and then amplifying the received initial input signal Ve' according to the compensation factor to obtain the amplified signal, which is the input signal Ve.

[0073] Moreover, in specific implementation, when the amplification compensation circuit 104 executes the operation of amplifying the received initial input signal Ve' according to the compensation factor to obtain the amplified signal, which is the input signal Ve, it can specifically execute: respectively amplifying the received initial input signal Ve' according to a specified ratio and the compensation factor for the second time, and the signal after the second amplification is the input signal Ve. It can be understood that after the initial input signal Ve' is amplified once according to the specified ratio, the amplitude of the signal after the first amplification can be made consistent with the amplitude of the carrier signal Vc. Then, the signal after the first amplification is amplified a second time according to the compensation factor. This can not only achieve the purpose of increasing the signal after the first amplification when the driving signal Vo output by the driving enhancement circuit 102 is less than the target driving signal, thereby increasing the duty cycle of the pulse width modulation signal PWM and achieving the purpose of increasing the driving signal Vo output by the driving enhancement circuit 102, but also achieve the purpose of reducing the signal after the first amplification when the driving signal Vo output by the driving enhancement circuit 102 is greater than the target driving signal, thereby reducing the duty cycle of the pulse width modulation signal PWM and achieving the purpose of reducing the driving signal Vo output by the driving enhancement circuit 102. Therefore, in the embodiment of the present application, by setting the feedback loop 109 in the piezoelectric ceramic driving circuit 100, the driving signal Vo output by the driving enhancement circuit 102 can be modulated to the target driving signal, thereby effectively improving the control accuracy of the driving signal Vo output by the driving enhancement circuit 102.

[0074] Among them, the target driving signal is the voltage required to drive the piezoelectric ceramic 200 and corresponds to the initial input signal Ve'. Moreover, the compensation factor is related to the difference between the driving signal Vo output by the driving enhancement circuit 102 and the target driving signal. Specifically, when the driving signal Vo output by the driving enhancement circuit 102 is less than the target driving signal, the compensation factor is greater than 1, and the greater the difference between the driving signal Vo output by the driving enhancement circuit 102 and the target driving signal, the greater the compensation factor; when the driving signal Vo output by the driving enhancement circuit 102 is greater than the target driving signal, the compensation factor is less than 1, and the greater the difference between the driving signal Vo output by the driving enhancement circuit 102 and the target driving signal, the greater the compensation factor; when the driving signal Vo output by the driving enhancement circuit 102 is equal to the target driving signal, the compensation factor is equal to 1.

[0075] As can be seen from the above, the piezoelectric ceramic drive circuit provided in this embodiment includes a comparison circuit and a drive enhancement circuit. Among them, the comparison circuit is connected to the drive enhancement circuit, and the drive enhancement circuit is connected to the piezoelectric ceramic. Moreover, the comparison circuit is configured to receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit. The drive enhancement circuit is configured to receive a power supply signal, and charge and discharge the piezoelectric ceramic through the received power supply signal and the pulse width modulation signal transmitted by the comparison circuit, so as to enable the drive enhancement circuit to output a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic. In this way, during the process of the piezoelectric ceramic drive circuit driving the piezoelectric ceramic to work, by modulating the input signal to obtain a pulse width modulation signal, it is possible to control the output magnitude of the high-voltage power supply signal through the pulse width modulation signal, thereby achieving high-power drive. And the piezoelectric ceramic drive circuit does not need to rely on a high-voltage integrated operational amplifier, so it can effectively solve the problem that it is difficult to achieve high-power drive in the existing piezoelectric ceramic drive circuit due to the limited working voltage of electronic components and the lack of support from high-power electronic components. This not only reduces the product cost, but also simplifies the implementation process of high-power piezoelectric ceramic drive and broadens the application scenarios of the product.

[0076] The embodiment of the present application also provides a vibration damping system, which includes the piezoelectric ceramic drive circuit of any of the above embodiments and a piezoelectric ceramic for outputting force. Among them, the piezoelectric ceramic drive circuit is used to drive the piezoelectric ceramic to output force to achieve the active vibration damping function of the vibration damping system. Exemplarily, the piezoelectric ceramic may specifically be a piezoelectric ceramic actuator or a piezoelectric stack ceramic.

[0077] Specifically, the piezoelectric ceramic drive circuit includes a comparison circuit and a drive enhancement circuit. Among them, the comparison circuit is connected to the drive enhancement circuit, and the drive enhancement circuit is connected to the piezoelectric ceramic. Moreover, the comparison circuit is configured to: receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit. The drive enhancement circuit is configured to: receive a power supply signal, and charge and discharge the piezoelectric ceramic through the received power supply signal and the pulse width modulation signal transmitted by the comparison circuit, so as to enable the drive enhancement circuit to output a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic.

[0078] In some embodiments, the above vibration damping system may further include a bottom plate and a top plate that are relatively spaced apart, and the above piezoelectric ceramic drive circuit and piezoelectric ceramic may be disposed between the bottom plate and the top plate. Specifically, the above vibration damping system may further include an equipment to be vibration-damped, and the equipment to be vibration-damped may be fixed above the top plate, so as to achieve vibration damping of the equipment to be vibration-damped.

[0079] In some specific embodiments, the above-mentioned vibration damping system may further include a spring vibration damping component and a sensor component disposed between the bottom plate and the top plate. One end (i.e., the top end) of the spring vibration damping component is fixed to the top plate, and the other end (i.e., the bottom end) of the spring vibration damping component is fixed to the bottom plate. The sensor component is fixed to the top plate and is used to detect the movement of the top plate.

[0080] Specifically, the above-mentioned vibration damping system may further include a controller. The controller can generate a control signal according to the detection result of the sensor component and send the control signal as an input signal to the comparison circuit in the above-mentioned piezoelectric ceramic drive circuit.

[0081] It should be noted that for the vibration damping system provided in the embodiments of the present application, due to the provision of the piezoelectric ceramic drive circuit provided in the embodiments of the present application, the beneficial effects achievable by any of the piezoelectric ceramic drive circuits provided in the embodiments of the present application can be realized. For details, please refer to the previous embodiments and will not be elaborated herein.

[0082] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A piezoelectric ceramic drive circuit, characterized in that, Comprising: A comparison circuit and a drive enhancement circuit; Wherein, the comparison circuit is connected to the drive enhancement circuit, and the comparison circuit is configured to: receive an input signal and a carrier signal, generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and transmit the pulse width modulation signal to the drive enhancement circuit; The drive enhancement circuit is connected to the piezoelectric ceramic, and the drive enhancement circuit is configured to: receive a power supply signal, and charge and discharge the piezoelectric ceramic through the received power supply signal and the pulse width modulation signal transmitted by the comparison circuit, so as to enable the drive enhancement circuit to output a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic; When the comparison circuit executes the step of generating a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, it specifically executes: When the received input signal is greater than the received carrier signal, convert the received input signal into a preset high level, and when the received input signal is less than or equal to the received carrier signal, convert the received input signal into a preset low level, so as to convert the input signal into a pulse width modulation signal corresponding to the input signal; Moreover, the input signal is used to control the magnitude of the drive signal output by the piezoelectric ceramic drive circuit to the piezoelectric ceramic, the drive signal is less than or equal to the power supply signal, and the ratio of the drive signal to the power supply signal changes with the duty cycle of the pulse width modulation signal, and the duty cycle of the pulse width modulation signal changes with the difference between the input signal and the carrier signal.

2. The piezoelectric ceramic drive circuit according to claim 1, characterized in that, The drive enhancement circuit includes: A power amplification control circuit and a power amplification circuit; Wherein, the power amplification control circuit is connected to the power amplification circuit, and the power amplification control circuit is configured to: when the pulse width modulation signal transmitted by the comparison circuit is at a high level, transmit a first control signal to the power amplification circuit, and when the pulse width modulation signal transmitted by the comparison circuit is at a low level, transmit a second control signal to the power amplification circuit; The power amplification circuit is connected to the piezoelectric ceramic, and the power amplification circuit is configured to: receive the power supply signal; when receiving the first control signal transmitted by the power amplification control circuit, transmit the received power supply signal to the piezoelectric ceramic to charge the piezoelectric ceramic; when receiving the second control signal transmitted by the power amplification control circuit, stop transmitting the power supply signal to the piezoelectric ceramic, and enable the piezoelectric ceramic to supply power to the load to discharge the piezoelectric ceramic.

3. The piezoelectric ceramic drive circuit according to claim 2, characterized in that, The power amplification circuit includes: A first controllable switch and a second controllable switch; wherein, the control terminals of the first controllable switch and the second controllable switch are both connected to the power amplification control circuit, the first terminal of the first controllable switch receives the power supply signal, the second terminal of the first controllable switch is connected to the first terminal of the piezoelectric ceramic, the first terminal of the second controllable switch is connected to the first terminal of the piezoelectric ceramic, the second terminal of the second controllable switch is connected to the first terminal of the load, and the second terminal of the load and the second terminal of the piezoelectric ceramic are both grounded; And, when the power amplification control circuit executes that when the pulse width modulation signal transmitted by the comparison circuit received is at a high level, it transmits a first control signal to the power amplification circuit, and when the pulse width modulation signal transmitted by the comparison circuit received is at a low level, it transmits a second control signal to the power amplification circuit, it specifically executes: When the pulse width modulation signal transmitted by the comparison circuit received is at a high level, it transmits a first control signal to the control terminal of the first controllable switch to turn on the first controllable switch, and when the pulse width modulation signal transmitted by the comparison circuit received is at a low level, it transmits a second control signal to the control terminal of the first controllable switch to turn off the second controllable switch; The power amplification control circuit is further configured as: When the pulse width modulation signal transmitted by the comparison circuit received is at a high level, it transmits a third control signal to the control terminal of the second controllable switch to turn off the second controllable switch, and when the pulse width modulation signal transmitted by the comparison circuit received is at a low level, it transmits a fourth control signal to the control terminal of the second controllable switch to turn on the second controllable switch.

4. The piezoelectric ceramic drive circuit according to claim 3, wherein, The first controllable switch and the second controllable switch are both switching tubes; the power amplification control circuit is a half-bridge switching circuit.

5. The piezoelectric ceramic drive circuit according to claim 1, wherein The piezoelectric ceramic drive circuit further includes: A feedback loop and an amplification compensation circuit; Wherein, the feedback loop is connected to the amplification compensation circuit, and the feedback loop is configured to: feedback the drive signal output by the drive enhancement circuit to the piezoelectric ceramic to the amplification compensation circuit; The amplification compensation circuit is connected to the comparison circuit, and the amplification compensation circuit is configured to: receive an initial input signal; perform amplification compensation processing on the received initial input signal according to the feedback signal of the feedback loop to obtain the input signal, and transmit the input signal to the comparison circuit.

6. The piezoelectric ceramic drive circuit according to claim 1, wherein, The piezoelectric ceramic drive circuit further includes: A carrier signal generator, the carrier signal generator is connected to the comparison circuit, and the carrier signal generator is configured to: generate a carrier signal according to preset carrier parameters and transmit the carrier signal to the comparison circuit.

7. The piezoelectric ceramic drive circuit according to claim 1, wherein The input signal is a sine wave signal; the carrier signal is a triangular wave signal.

8. The piezoelectric ceramic drive circuit according to claim 1, characterized in that, The piezoelectric ceramic drive circuit further includes: An input power supply and a step-up transformer; Wherein, the input power supply is connected to the step-up transformer, and the input power supply is configured to provide an initial power supply signal to the step-up transformer; The step-up transformer is connected to the driving enhancement circuit, and the step-up transformer is configured to: boost the received initial power signal to obtain the power signal, and transmit the power signal to the driving enhancement circuit.

9. The piezoelectric ceramic drive circuit according to claim 8, wherein, The piezoelectric ceramic driving circuit further includes: A filter, which is connected between the step-up transformer and the driving enhancement circuit.

10. The piezoelectric ceramic drive circuit according to claim 1, characterized in that, The piezoelectric ceramic driving circuit further includes: A filter, which is connected between the driving enhancement circuit and the piezoelectric ceramic.

11. The piezoelectric ceramic drive circuit according to claim 10, characterized in that, The filter includes: An inductor and a resistor. Among them, the first end of the inductor is electrically connected to the driving enhancement circuit, the second end of the inductor is electrically connected to the piezoelectric ceramic, the first end of the resistor is electrically connected to the first end of the inductor, and the second end of the resistor is grounded.

12. The piezoelectric ceramic drive circuit according to claim 1, wherein The comparison circuit is a comparator.

13. A vibration damping system, characterized in that, Including the piezoelectric ceramic driving circuit according to any one of claims 1 to 12.

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