Piezoelectric ceramic driving circuit and vibration reduction system

Abstract

The invention relates to a piezoelectric ceramic driving circuit and a vibration reduction system. The piezoelectric ceramic driving circuit comprises a comparison circuit and a driving 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 driving enhancement circuit; the driving enhancement circuit is configured to receive the power supply signal and charge and discharge the piezoelectric ceramic through the power supply signal and the pulse width modulation signal, so that the driving enhancement circuit outputs a driving signal corresponding to the pulse width modulation signal to the piezoelectric ceramic, and therefore, the input signal is modulated to obtain the pulse width modulation signal; according to the high-power piezoelectric ceramic driving circuit, the output size of the high-voltage power supply signal can be controlled through the pulse width modulation signal, so that high-power driving is realized, the piezoelectric ceramic driving circuit does not need to depend on a high-voltage integrated operational amplifier, the cost is reduced, the implementation process of high-power piezoelectric ceramic driving is simplified, and the application scene of a product is widened.

Description

Technical Field

[0001] The present application relates to the technical field of piezoelectric ceramic drive control, and in particular to a piezoelectric ceramic drive circuit and a vibration reduction system. Background Art

[0002] Piezoelectric ceramics are ceramic materials that can convert mechanical energy into electrical energy and vice versa, and have the inverse piezoelectric effect. When piezoelectric ceramic materials are placed in an external electric field, the piezoelectric body generates corresponding stress and strain phenomena while being polarized, thereby achieving work, which makes it applicable to the excitation system or vibration reduction system in various micro-mechanical electronic systems.

[0003] In the prior art, piezoelectric ceramics are usually driven and controlled by high-voltage driving circuits. The high-voltage driving circuits can input higher voltages to meet the driving requirements of piezoelectric ceramics. However, the proportional amplifier circuits in the high-voltage driving circuits usually use high-voltage integrated operational amplifiers that have been processed by special processes. Most of these amplifiers are single-chip designs with high costs. In addition, since 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 driving circuit in the prior art can realize medium-power piezoelectric ceramic driving, it is difficult to realize a high-power piezoelectric ceramic driving circuit due to the limited working voltage of electronic components and the lack of support from high-power electronic components. Summary of the invention

[0005] The purpose of the present application is to provide a driving circuit, a piezoelectric ceramic driving circuit and a vibration reduction system to solve the problem in the prior art that the piezoelectric ceramic driving circuit is difficult to achieve high-power piezoelectric ceramic driving, thereby expanding its application scenarios.

[0006] An embodiment of the present application provides a piezoelectric ceramic driving circuit, which includes a comparison circuit and a driving enhancement circuit; wherein the comparison circuit is connected to the driving 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 driving enhancement circuit; the driving enhancement circuit is connected to the piezoelectric ceramic, and the driving enhancement circuit is configured to: receive a power signal, and charge and discharge the piezoelectric ceramic through the received power signal and the pulse width modulation signal transmitted by the comparison circuit, so as to enable the driving enhancement circuit to output a driving signal corresponding to the pulse width modulation signal to the piezoelectric ceramic.

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

[0008] The power amplifier 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 amplifier control circuit, the first end of the first controllable switch receives a 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 the power amplifier control circuit transmits a first control signal to the power amplifier circuit when the pulse width modulation signal transmitted by the comparison circuit received is at a high level, and transmits a first control signal to the power amplifier circuit when the pulse width modulation signal transmitted by the comparison circuit received is at a low level. When sending the second control signal, the specific execution is: when the pulse width modulation signal transmitted by the comparison circuit is received at a high level, the first control signal is transmitted 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 received at a low level, the second control signal is transmitted to the control end of the first controllable switch to turn off the second controllable switch; the power amplification control circuit is also configured to: when the pulse width modulation signal transmitted by the comparison circuit is received at a high level, the third control signal is transmitted 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 received at a low level, the fourth control signal is transmitted to the control end of the second controllable switch to turn on the second controllable switch.

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

[0010] Among them, when the comparison circuit generates a pulse width modulation signal corresponding to the control 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 converted to 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 converted to a preset low level, so as to realize the conversion of the input signal into a pulse width modulation signal corresponding to the input signal.

[0011] Among them, the piezoelectric ceramic driving circuit also 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: feed back the driving signal output by the driving 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 and compensation processing on the received initial input signal according to the feedback signal of the feedback loop to obtain an input signal, and transmit the input signal to the comparison circuit.

[0012] The piezoelectric ceramic driving 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 a preset carrier parameter, 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 triangle wave signal.

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

[0015] The piezoelectric ceramic driving circuit further includes: a second filter connected between the boost transformer and the driving enhancement circuit.

[0016] The piezoelectric ceramic driving circuit further includes: a first filter connected between the driving enhancement circuit and the piezoelectric ceramic.

[0017] 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] Wherein, the comparison circuit is a comparator.

[0019] An embodiment of the present application further provides a vibration reduction system, which includes any of the piezoelectric ceramic drive circuits described above.

[0020] The beneficial effects of the present application are as follows: the piezoelectric ceramic drive circuit and vibration reduction system provided by the present application, the piezoelectric ceramic drive circuit can be applied to the vibration reduction 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, and to generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and to transmit the pulse width modulation signal to the drive enhancement circuit; the drive enhancement circuit is configured to receive a power supply signal, and to 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 The driving enhancement circuit now outputs a driving signal corresponding to the pulse width modulation signal to the piezoelectric ceramic. In this way, in the process of the piezoelectric ceramic driving circuit driving the piezoelectric ceramic, the pulse width modulation signal is obtained by modulating the input signal, and the output size of the high-voltage power supply signal can be controlled by the pulse width modulation signal, thereby realizing high-power driving. The piezoelectric ceramic driving circuit does not need to rely on a high-voltage integrated operational amplifier, and can effectively solve the problem that the existing piezoelectric ceramic driving circuit is difficult to achieve high-power driving due to the limited working voltage of electronic components and the lack of support from high-power electronic components. This not only reduces product costs, but also simplifies the implementation process of high-power piezoelectric ceramic driving and broadens the application scenarios of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0022] Figure 1 is a schematic diagram of the structure of a piezoelectric ceramic driving circuit provided in an embodiment of the present application; Figure 2 is a timing diagram of a piezoelectric ceramic driving circuit provided in an embodiment of the present application; Figure 3 is another structural schematic diagram of the piezoelectric ceramic driving circuit provided in an embodiment of the present application; Figure 4 is another structural schematic diagram of the piezoelectric ceramic driving circuit provided in an embodiment of the present application; Figure 5 is another structural schematic diagram of the piezoelectric ceramic driving circuit provided in an embodiment of the present application; Figure 6 is an equivalent circuit diagram of a piezoelectric ceramic driving circuit provided in an embodiment of the present application when charging a piezoelectric ceramic; Figure 7is an equivalent circuit diagram of a piezoelectric ceramic driving circuit provided in an embodiment of the present application when discharging a piezoelectric ceramic; Figure 8 is another structural schematic diagram of the piezoelectric ceramic driving circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0028] The following is a detailed description with reference to specific embodiments. It should be noted that the serial numbers of the following embodiments are not intended to limit the preferred order of the embodiments.

[0029] See also Figure 1 , Figure 1 Schematic diagram of the structure of the piezoelectric ceramic drive circuit provided in the embodiment of the present application. Figure 1 As shown, the piezoelectric ceramic driving circuit 100 includes a comparison circuit 101 and a driving enhancement circuit 102, wherein the comparison circuit 101 is connected to the driving enhancement circuit 102, and the driving enhancement circuit 102 is connected to the piezoelectric ceramic 200. In addition, 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 driving enhancement circuit 102. The driving enhancement circuit 102 is configured to: receive a power signal Vp, and charge and discharge the piezoelectric ceramic 200 through the received power signal Vp and the pulse width modulation signal PWM transmitted by the comparison circuit 101, so as to realize that the driving enhancement circuit 102 outputs a driving signal Vo corresponding to the pulse width modulation signal PWM to the piezoelectric ceramic 200.

[0030] The input signal Ve is used to control the size 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 signal Vp. The power signal Vp can be a high-voltage power signal and can be a fixed value, and the fixed value can range from 800 to 1200V. For example, the power signal Vp can be specifically 1000V. The piezoelectric ceramic 200 can be specifically a piezoelectric ceramic actuator or a piezoelectric stacked ceramic.

[0031] In this embodiment, the ratio of the driving signal Vo to the power signal Vp may vary with the duty cycle of the pulse width modulation signal PWM, and the duty cycle of the pulse width modulation signal PWM may vary 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, the duty cycle of the pulse width modulation signal PWM generated by the comparison circuit 101 may be changed, so that when the power signal Vp remains unchanged, the size of the driving signal Vo output by the driving enhancement circuit 102 to the piezoelectric ceramic 200 may be adjusted to meet the driving requirements of the piezoelectric ceramic 200.

[0032] Specifically, in the above-mentioned piezoelectric ceramic driving circuit 100, the ratio of the driving signal Vo to the power 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 above-mentioned piezoelectric ceramic driving circuit 100 to the piezoelectric ceramic 200 can be linearly controlled by the input signal Ve.

[0033] It should be noted that, in the above-mentioned 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, so as to realize the control of the driving signal Vo. In addition, the duty cycle of the pulse width modulation signal PWM can refer to the ratio of its high level time to its total cycle time (that is, the sum of its high level time and its low level time).

[0034] Specifically, in the above-mentioned piezoelectric ceramic driving circuit 100, the input signal Ve and the carrier signal Vc can both be analog signals. In addition, the carrier signal Vc can be pre-set 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. In this way, the driving signal Vo output by the above-mentioned piezoelectric ceramic driving circuit 100 to the piezoelectric ceramic 200 can be controlled by changing the input signal Ve based on the carrier signal Vc.

[0035] Furthermore, in a specific implementation, when the 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, the comparison circuit 101 may specifically perform: when the received input signal Ve is greater than the received carrier signal Vc, the received input signal Ve is converted to a preset high level, and when the received input signal Ve is less than or equal to the received carrier signal Vc, the received input signal Ve is converted to a preset low level, so as to realize the conversion of the input signal Ve into a pulse width modulation signal PWM corresponding to the input signal Ve. The preset high level is greater than the preset low level, and the pulse width modulation signal PWM may specifically be a digital signal composed of a preset high level and a preset low level, and the time of its high level may specifically refer to the time of its preset high level, and the time of its low level may specifically refer to the time of its preset low level.

[0036] Exemplarily, the input signal Ve may be a sinusoidal wave signal, for example, Figure 2 The carrier signal Vc may be a triangular wave signal, for example, Figure 2 The process of comparing the sine wave signal with the triangular wave signal by the comparison circuit 101 can be as follows: Figure 2 As shown, the pulse width modulation signal PWM generated in the process can be specifically Figure 2 The pulse width modulated signal shown in .

[0037] Specifically, in the above-mentioned piezoelectric ceramic driving circuit 100, the comparison circuit 101 may have two input terminals (i.e., a first input terminal and a second input terminal) and an output terminal, and the driving enhancement circuit 102 may have two input terminals (i.e., a first input terminal and a second input terminal) and an output terminal, wherein the first input terminal of the comparison circuit 101 may be used to receive an input signal Ve, the second input terminal of the comparison circuit 101 may be used to receive a carrier signal Vc, the output terminal of the comparison circuit 101 may be electrically connected to the first input terminal of the driving enhancement circuit 102, the second input terminal of the driving enhancement circuit 102 may be used to receive a power signal Vp, and the output terminal of the driving enhancement circuit 102 may be electrically connected to the piezoelectric ceramic 200. In this way, the comparison circuit 101 may transmit the pulse width modulation signal PWM generated by it 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 the driving enhancement circuit 102 may output the driving signal Vo to the piezoelectric ceramic 200 through its output terminal.

[0038] For example, Figure 3As shown, in the above-mentioned piezoelectric ceramic driving circuit 100, the comparison circuit 101 can be specifically a comparator 101, and the first input terminal and the second input terminal of the comparison circuit 101 can be respectively the positive input terminal and the negative input terminal of the comparator 101. In this way, by using the fast response method of the comparator 101 to process the input signal Ve, the signal processing delay can be reduced.

[0039] In some embodiments, Figure 3 As shown, the piezoelectric ceramic driving circuit 100 may further include a carrier signal generator 103, which is connected to the comparison circuit 101 (e.g., 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.

[0040] In some specific embodiments, the carrier signal Vc may be specifically a triangular wave signal, and the carrier signal generator 103 may be specifically a triangular wave signal generator 103 (such as Figure 4 ). Moreover, the triangular wave signal generator 103 may be specifically configured to generate a triangular wave signal according to preset triangular wave parameters, and transmit the triangular wave signal as a carrier signal Vc to the comparison circuit 101. 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.

[0041] In some embodiments, Figure 3 As shown, the piezoelectric ceramic driving circuit 100 may also include an amplifier circuit 104, which is connected to the comparison circuit 101 (for example, the first input terminal of the comparison circuit 101). In addition, the amplifier circuit 104 may be configured to: receive an initial input signal Ve'; amplify the received initial input signal Ve' to obtain an 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 driving (for example, high-voltage driving) of the piezoelectric ceramic 200 can be achieved when the initial input signal Ve' is very small.

[0042] Specifically, when the amplifying circuit 104 performs amplification processing on the received initial input signal Ve' to obtain the input signal Ve, it can specifically perform: amplify the received initial input signal Ve' according to the specified amplification ratio, and obtain the amplified signal as 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 (for example, 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 by the comparison circuit 101 when comparing the input signal Ve with the carrier signal Vc can be improved.

[0043] In the above embodiment, if Figure 3 As shown, in the above-mentioned piezoelectric ceramic driving circuit 100 , the driving enhancement circuit 102 may include a power amplification control circuit 1021 and a power amplification circuit 1022 , wherein 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 .

[0044] Furthermore, the power amplifier control circuit 1021 may be configured to: when the received pulse width modulation signal PWM transmitted by the comparison circuit 101 is at a high level (for example, the above-mentioned preset high level), transmit a first control signal to the power amplifier circuit 1022, and when the received pulse width modulation signal PWM transmitted by the comparison circuit 101 is at a low level (for example, the above-mentioned preset low level), transmit a second control signal to the power amplifier circuit 1022. The power amplifier circuit 1022 may be configured to: receive a power signal Vp; when receiving the first control signal transmitted by the power amplifier control circuit 1021, transmit the received power signal Vp to the piezoelectric ceramic 200 to charge the piezoelectric ceramic 200; when receiving the second control signal transmitted by the power amplifier control circuit 1021, stop transmitting the power 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 a desired voltage.

[0045] In some specific embodiments, Figure 5As shown, in the above-mentioned piezoelectric ceramic driving circuit 100, the power amplifier circuit 1022 may include a first controllable switch Q1 and a second controllable switch Q2, wherein the control end of the first controllable switch Q1 and the control end of the second controllable switch Q2 may both be connected to the power amplifier control circuit 1021, the first end of the first controllable switch Q1 may receive the power signal Vp, the second end of the first controllable switch Q1 may be connected to the first end of the piezoelectric ceramic 200, the first end of the second controllable switch Q2 may be connected to the first end of the piezoelectric ceramic 200, the second end of the second controllable switch Q2 may be connected to the first end of the load R1, and the second end of the load R1 and the second end of the piezoelectric ceramic 200 may both be grounded.

[0046] Furthermore, when the power amplification control circuit 1021 transmits the first control signal to the power amplification circuit 1022 when the pulse width modulation signal PWM received from the comparison circuit 101 is at a high level, and transmits the second control signal to the power amplification circuit 1022 when the pulse width modulation signal PWM received from the comparison circuit 101 is at a low level, the power amplification control circuit 1021 may specifically execute: when the pulse width modulation signal PWM received from the comparison circuit 101 is at a high level (for example, the preset high level), the first control signal is transmitted to the control end of the first controllable switch Q1 to turn on the first controllable switch Q1, and when the pulse width modulation signal PWM received from the comparison circuit 101 is at a low level (for example, the preset low level), the second control signal is transmitted to the control end of the first controllable switch Q1 to turn off the second controllable switch Q2.

[0047] Specifically, the power amplification control circuit 1021 may also be configured to: when the pulse width modulation signal PWM received from the comparison circuit 101 is at a high level (for example, the preset high level), transmit a third control signal to the control end of the second controllable switch Q2 to turn off the second controllable switch Q2; and when the pulse width modulation signal PWM received from the comparison circuit 101 is at a low level (for example, the preset low level), transmit a fourth control signal to the control end of the second controllable switch Q2 to turn on the second controllable switch Q2.

[0048] Thus, in the process of the piezoelectric ceramic driving circuit 100 driving the piezoelectric ceramic 200, it can be achieved that: when the pulse width modulation signal PWM output by the comparison circuit 101 is at a high level (for example, the preset high level), the first controllable switch Q1 is turned on and the second controllable switch Q2 is turned off, so that the power signal Vp can charge the piezoelectric ceramic 200, thereby raising the voltage of the first end of the piezoelectric ceramic 200 (for example, 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 preset low level), the first controllable switch Q1 is turned off and the second controllable switch Q2 is turned on, so that the power signal Vp no longer charges the piezoelectric ceramic 200, and the piezoelectric ceramic 200 can supply power to the load R1 by discharging, thereby reducing the voltage at the first end of the piezoelectric ceramic 200 (for example, Figure 7 shown), and Figure 7 The direction of the arrow in the figure indicates the direction of the current. Therefore, the voltage across the piezoelectric ceramic 200 can be adjusted to a desired voltage.

[0049] For example, Figure 5 As shown, the first controllable switch Q1 may be a switch tube Q1. Figure 5 As shown, the switch tube Q1 can be specifically a field effect tube Q1, the above-mentioned first control signal can be specifically a voltage signal, and its corresponding voltage value is greater than the threshold voltage of the field effect tube Q1, and 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 tube Q1.

[0050] For example, Figure 5 As shown, the second controllable switch Q2 may be a switch tube Q2. In addition, in a specific implementation, Figure 5 As shown, the switch tube Q2 can be specifically a field effect tube Q2, the above-mentioned third control signal can be specifically a voltage signal, and its corresponding voltage value is greater than the threshold voltage of the field effect tube Q2, and 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 tube Q2.

[0051] For example, Figure 5 As shown, the power amplification control circuit 1021 can be specifically a half-bridge switch circuit 1021. In addition, during specific implementation, the specific structure of the half-bridge switch circuit 1021 can refer to the specific structure of the half-bridge switch circuit in the prior art, so it will not be repeated here.

[0052] For example, Figure 5 As shown, the load R1 can be specifically a resistor R1. In addition, during implementation, the resistance value of the resistor R1 can be flexibly set according to actual needs.

[0053] Furthermore, it should be noted that Figure 5Taking the circuit structure shown as an example, the embodiment of the present application processes the input signal Ve in a fast response manner using the comparator 104, thereby reducing the signal processing delay, and enhancing the control loop bandwidth through the high-speed switching capability of the power switch tube, so as to meet the requirement that the output voltage (i.e., the drive signal Vo) changes rapidly with the input voltage (i.e., the input signal Ve) without affecting the loop bandwidth, thereby providing a high-bandwidth, fast-response high-voltage drive power supply, whose output voltage can be linearly regulated by the input signal Ve, with low latency, and the output voltage is not affected by jump fluctuations due to the power supply voltage.

[0054] In some embodiments, Figure 4 As shown, the piezoelectric ceramic driving circuit 100 may further include a filter (i.e., a 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.

[0055] Specifically, Figure 5 As shown, in the above-mentioned piezoelectric ceramic driving circuit 100, the first filter 105 may include an inductor L and a resistor R2, wherein a first end of the inductor L is electrically connected to the driving enhancement circuit 102, a second end of the inductor L is electrically connected to the piezoelectric ceramic 200, a first end of the resistor R2 is electrically connected to a first end of the inductor L, and a second end of the resistor R2 is grounded.

[0056] Specifically, Figure 5 Taking the circuit structure shown as an example, the first end of the inductor L can be electrically connected to the second end of the first controllable switch Q1 in the driving enhancement circuit 102 .

[0057] In the above embodiment, if Figure 8 As shown, the 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 terminal of the driving enhancement circuit 102). In addition, 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.

[0058] The initial power signal Vp' is smaller than the power signal Vp, and the initial power signal Vp' and the power signal Vp may be a low voltage power signal Vp' and a high voltage power signal Vp, respectively. For example, the initial power signal Vp' may be 12V, 24V or 48V, and the power signal Vp may be 800V, 1000V or 1200V. The input power supply 106 may be a DC input power supply, for example, a 48V DC input power supply, for providing a voltage of 48V as the initial power signal Vp'.

[0059] Specifically, in the above-mentioned piezoelectric ceramic drive circuit 100, when the boost transformer 107 performs the step-up on the received initial power signal Vp' to obtain the power signal Vp, it can specifically perform: the received initial power signal Vp' is boosted according to the preset boost ratio, and the boosted signal is the power signal Vp. Among them, the preset boost ratio can be flexibly set according to actual needs. For example, when the initial power signal Vp' is 48V, the preset boost ratio can be set to 1000 / 48, then the boost transformer 107 boosts the 48V initial power signal Vp' according to the preset boost ratio of 1000 / 48 times, and the obtained power 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 requirement of the piezoelectric ceramic 200 and the boost capability of the boost transformer 107. By boosting the initial power signal Vp′ through the boost transformer 107 , a power signal Vp that meets the working requirements of the piezoelectric ceramic 200 can be obtained, thereby providing a stable and efficient high-voltage driving power supply for the piezoelectric ceramic.

[0060] By way of example, in the above-mentioned piezoelectric ceramic driving circuit 100 , the boost transformer 107 may be specifically a flyback switching power supply.

[0061] In some embodiments, Figure 8 As shown, the piezoelectric ceramic driving circuit 100 may further include another filter (i.e., a second filter 108). The second filter 108 is connected between the boost transformer 107 and the driving enhancement circuit 102, and can effectively filter the power signal Vp transmitted between the boost transformer 107 and the driving enhancement circuit 102, thereby improving the quality of the power signal Vp.

[0062] Specifically, Figure 5 Taking the circuit structure shown 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 driving enhancement circuit 102 .

[0063] In the above embodiment, the piezoelectric ceramic driving circuit 100 further includes an amplifier circuit 104. Figure 8 As shown, the amplifying circuit 104 may be specifically an amplifying compensation circuit 104, and the piezoelectric ceramic driving circuit 100 may further include a feedback loop 109, which is connected to the amplifying compensation circuit 104. In addition, the feedback loop 109 is configured to feed back the driving signal Vo output by the driving enhancement circuit 102 to the piezoelectric ceramic 200 to the amplifying compensation circuit 104. The amplifying compensation circuit 104 may be specifically configured to: receive an initial input signal Ve'; perform amplifying compensation 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.

[0064] The feedback signal of the feedback loop 109 may be a signal obtained by dividing the driving signal Vo output by the driving enhancement circuit 102 by the feedback loop 109 according to a preset voltage division ratio. Specifically, the feedback signal is smaller than the driving signal Vo, and the ratio of the feedback signal to the driving signal Vo may be equal to the preset voltage division ratio. Furthermore, in a specific implementation, the feedback loop 109 may include a resistor, and the feedback signal of the feedback loop 109 may be a signal obtained by dividing the driving signal Vo output by the driving enhancement circuit 102 by the resistor.

[0065] Specifically, when the amplification compensation circuit 104 performs amplification compensation processing on the received initial input signal according to the feedback signal of the feedback loop 109 to obtain the input signal, it can specifically execute: determine the compensation factor according to the feedback signal of the feedback loop 109, and then amplify the received initial input signal Ve' according to the compensation factor, and the amplified signal is the input signal Ve.

[0066] Furthermore, in a specific implementation, when the amplification compensation circuit 104 amplifies the received initial input signal Ve' according to the compensation factor and obtains the amplified signal as the input signal Ve, it can specifically execute: amplifying the received initial input signal Ve' twice according to the specified ratio and compensation factor respectively, and obtaining the twice amplified signal as 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 consistent with the amplitude of the carrier signal Vc, and then the signal after the first amplification is amplified twice according to the compensation factor, which can not only increase 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 reduce 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.

[0067] The target driving signal is the voltage required to drive the piezoelectric ceramic 200, and corresponds to the initial input signal Ve'. In addition, 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.

[0068] As can be seen from the above, the piezoelectric ceramic driving circuit provided in this embodiment includes a comparison circuit and a driving enhancement circuit, wherein the comparison circuit is connected to the driving enhancement circuit, and the driving enhancement circuit is connected to the piezoelectric ceramic; and the comparison circuit is configured to receive an input signal and a carrier signal, and to generate a pulse width modulation signal corresponding to the input signal by comparing the received input signal with the received carrier signal, and to transmit the pulse width modulation signal to the driving enhancement circuit; the driving enhancement circuit is configured to receive a power supply signal, and to 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 driving enhancement circuit outputs power to the piezoelectric ceramic. A driving signal corresponding to a pulse width modulation signal, in this way, in the process of the piezoelectric ceramic driving circuit driving the piezoelectric ceramic, the pulse width modulation signal is obtained by modulating the input signal, and the output size of the high-voltage power supply signal can be controlled by the pulse width modulation signal, thereby realizing high-power driving, and the piezoelectric ceramic driving circuit does not need to rely on a high-voltage integrated operational amplifier, so it can effectively solve the problem that the existing piezoelectric ceramic driving circuit is difficult to achieve high-power driving due to the limited working voltage of electronic components and the lack of support from high-power electronic components. This not only reduces product costs, but also simplifies the implementation process of high-power piezoelectric ceramic driving and broadens the application scenarios of the product.

[0069] The embodiment of the present application also provides a vibration reduction system, which includes a piezoelectric ceramic drive circuit of any of the above embodiments and a piezoelectric ceramic for outputting force, wherein the piezoelectric ceramic drive circuit is used to drive the piezoelectric ceramic to output force, so as to realize the active vibration reduction function of the vibration reduction system. Exemplarily, the piezoelectric ceramic can be specifically a piezoelectric ceramic actuator or a piezoelectric stacked ceramic.

[0070] Specifically, the piezoelectric ceramic driving circuit includes a comparison circuit and a driving enhancement circuit, wherein the comparison circuit is connected to the driving enhancement circuit, and the driving enhancement circuit is connected to the piezoelectric ceramic. In addition, 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 driving enhancement circuit. The driving 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 driving enhancement circuit outputs a driving signal corresponding to the pulse width modulation signal to the piezoelectric ceramic.

[0071] In some embodiments, the vibration reduction system may further include a bottom plate and a top plate that are relatively spaced apart, and the piezoelectric ceramic drive circuit and the piezoelectric ceramic may be disposed between the bottom plate and the top plate. Specifically, the vibration reduction system may further include a vibration-reduced device, and the vibration-reduced device may be fixed above the top plate, thereby achieving vibration reduction of the vibration-reduced device.

[0072] In some specific embodiments, the vibration reduction system may further include a spring vibration reduction assembly and a sensor assembly disposed between the bottom plate and the top plate. One end (i.e., the top end) of the spring vibration reduction assembly is fixed to the top plate, and the other end (i.e., the bottom end) of the spring vibration reduction assembly is fixed to the bottom plate. The sensor assembly is fixed to the top plate and is used to detect the movement of the top plate.

[0073] Specifically, the vibration reduction system may further include a controller, which is capable of generating a control signal according to the detection result of the sensor assembly, and sending the control signal as an input signal to the comparison circuit in the piezoelectric ceramic drive circuit.

[0074] It should be noted that the vibration reduction system provided in the embodiment of the present application, since it is equipped with the piezoelectric ceramic driving circuit provided in the embodiment of the present application, can achieve the beneficial effects that can be achieved by any piezoelectric ceramic driving circuit provided in the embodiment of the present application. Please refer to the previous embodiments for details, which will not be repeated here.

[0075] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A piezoelectric ceramic driving circuit, characterized in that: include: Comparison circuit and drive enhancement circuit; The comparison circuit is connected to the driving 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 driving 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 that the drive enhancement circuit outputs a drive signal corresponding to the pulse width modulation signal to the piezoelectric ceramic.

2. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The driving enhancement circuit comprises: Power amplifier control circuit and power amplifier circuit; The power amplification control circuit is connected to the power amplification circuit, and the power amplification control circuit is configured to: transmit a first control signal to the power amplification circuit when the pulse width modulation signal transmitted by the comparison circuit is at a high level, and transmit a second control signal to the power amplification circuit when the pulse width modulation signal transmitted by the comparison circuit is at a low level; The power amplifier circuit is connected to the piezoelectric ceramic, and the power amplifier circuit is configured to: receive the power signal; when receiving the first control signal transmitted by the power amplifier control circuit, transmit the received power signal to the piezoelectric ceramic to charge the piezoelectric ceramic; when receiving the second control signal transmitted by the power amplifier control circuit, stop transmitting the power 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 driving circuit according to claim 2, characterized in that: The power amplifier circuit comprises: 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 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; Furthermore, when the power amplification control circuit executes the steps of transmitting a first control signal to the power amplification circuit when the pulse width modulation signal received from the comparison circuit is at a high level, and transmitting a second control signal to the power amplification circuit when the pulse width modulation signal received from the comparison circuit is at a low level, the power amplification control circuit specifically executes: When the received pulse width modulation signal transmitted by the comparison circuit is at a high level, a first control signal is transmitted to the control end of the first controllable switch to turn on the first controllable switch, and when the received pulse width modulation signal transmitted by the comparison circuit is at a low level, a second control signal is transmitted to the control end 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 received from the comparison circuit is at a high level, a third control signal is transmitted to the control end of the second controllable switch to turn off the second controllable switch, and when the pulse width modulation signal received from the comparison circuit is at a low level, a fourth control signal is transmitted to the control end of the second controllable switch to turn on the second controllable switch.

4. The piezoelectric ceramic driving circuit according to claim 3, characterized in that: The first controllable switch and the second controllable switch are both switch tubes; and the power amplification control circuit is a half-bridge switch circuit.

5. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: When the comparison circuit generates a pulse width modulation signal corresponding to the control signal by comparing the received input signal with the received carrier signal, the comparison circuit specifically performs: When the received input signal is greater than the received carrier signal, the received input signal is converted to 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 converted to a preset low level, so as to realize the conversion of the input signal into a pulse width modulation signal corresponding to the input signal.

6. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The piezoelectric ceramic driving circuit also includes: Feedback loop and amplifier compensation circuit; Wherein, the feedback loop is connected to the amplification compensation circuit, and the feedback loop is configured to: feed back the driving signal output by the driving 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.

7. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The piezoelectric ceramic driving circuit also includes: A carrier signal generator is connected to the comparison circuit, and the carrier signal generator is configured to generate a carrier signal according to a preset carrier parameter and transmit the carrier signal to the comparison circuit.

8. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The input signal is a sine wave signal; the carrier signal is a triangle wave signal.

9. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The piezoelectric ceramic driving circuit also includes: Input power supply and 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 boost transformer is connected to the driving enhancement circuit, and the boost 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.

10. The piezoelectric ceramic driving circuit according to claim 9, characterized in that: The piezoelectric ceramic driving circuit also includes: A filter is connected between the boost transformer and the drive enhancement circuit.

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

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

13. The piezoelectric ceramic driving circuit according to claim 1, characterized in that: The comparison circuit is a comparator.

14. A vibration reduction system, characterized in that: A piezoelectric ceramic driving circuit comprising any one of claims 1 to 13.

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