High-voltage piezoelectric ceramic driver and control method

Abstract

The invention provides a high-voltage piezoelectric ceramic driver and a control method, and the driver comprises a system control module and a voltage amplification module. The system control module comprises a control unit, a first switch unit and a second switch unit, a first selection input end of the first switch unit is used for receiving an external first signal, and a second selection input end and a first control end of the first switch unit are respectively connected with the control unit; a third selection input end and a second control end of the second switch unit are respectively connected with the control unit, and a fourth selection input end of the second switch unit is used for receiving an external second signal; the voltage amplification module comprises a first amplification unit and a second amplification unit, the input end of the first amplification unit is connected with the output end of the first switch unit, the input end of the second amplification unit is connected with the output end of the second switch unit, and an external load is arranged between the output end of the first amplification unit and the output end of the second amplification unit. The piezoelectric ceramic driving circuit has relatively high driving voltage output, can meet the requirements of high-voltage driven piezoelectric ceramics, and is simple in overall structure and relatively low in implementation cost.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric ceramic drive, and in particular to a high-voltage piezoelectric ceramic driver and a control method thereof. Background Art

[0002] Existing piezoelectric ceramic drivers have problems such as generally low driving voltage, expensive high-voltage driving, and complex structure.

[0003] There is an existing piezoelectric ceramic drive control system that amplifies low-voltage signals to drive piezoelectric ceramics by setting an operational amplifier. This solution is limited by the performance of the operational amplifier, and the output voltage range is less than 250V, which cannot meet the requirements of piezoelectric ceramics that require higher voltage drive, and the output adjustment is not convenient. Summary of the invention

[0004] The first object of the present invention is to provide a high-voltage piezoelectric ceramic driver that is convenient for adjusting the driving voltage and provides a relatively high driving voltage.

[0005] A second object of the present invention is to provide a control method for a high-voltage piezoelectric ceramic driver that is convenient for adjusting the driving voltage range.

[0006] In order to achieve the above-mentioned first purpose, the present invention provides a high-voltage piezoelectric ceramic driver, which includes: a system control module and a voltage amplification module; the system control module includes a control unit, a first switch unit, and a second switch unit, the first selection input end of the first switch unit is used to receive an external first signal, the second selection input end and the first control end of the first switch unit are respectively connected to the control unit, the third selection input end and the second control end of the second switch unit are respectively connected to the control unit, and the fourth selection input end of the second switch unit is used to receive an external second signal; the voltage amplification module includes a first amplification unit and a second amplification unit, the input end of the first amplification unit is connected to the output end of the first switch unit, the input end of the second amplification unit is connected to the output end of the second switch unit, and an external load is set between the output end of the first amplification unit and the output end of the second amplification unit.

[0007] As can be seen from the above scheme, the present invention selects the first amplification unit and / or the second amplification unit of the voltage amplification module to drive the external load through the system control module, and the signal input to the voltage amplification module can be selected from the external signal or the internal output signal of the control unit. The present invention has a higher driving voltage output, which can meet the requirements of high-voltage driven piezoelectric ceramics, and can achieve outputs in different driving voltage ranges by selecting the first amplification unit and / or the second amplification unit. In addition, the present invention has a simple overall structure, low cost, and good economic benefits.

[0008] A further solution is that the first amplifying unit includes a first differential circuit, a first feedback circuit and a first bias circuit, the input end of the first differential circuit is connected to the output end of the first switching unit, the output end of the first differential circuit is respectively connected to the first feedback circuit and the external load, and the first bias circuit is used to provide a bias voltage for the first differential circuit; the second amplifying unit includes a second differential circuit, a second feedback circuit and a second bias circuit, the input end of the second differential circuit is connected to the output end of the second switching unit, the output end of the second differential circuit is respectively connected to the second feedback circuit and the external load, and the second bias circuit is used to provide a bias voltage for the second differential circuit.

[0009] It can be seen that the first amplifying unit and the second amplifying unit for voltage amplification of the present invention are simple in composition and easy to implement.

[0010] A further solution is that the first differential circuit includes a first PMOS tube, a second PMOS tube, a first NMOS tube and a second NMOS tube, and the first feedback circuit includes a first resistor, a first capacitor and a third resistor; the source of the first PMOS tube and the source of the second PMOS tube are connected to the first power supply end, the gate of the first PMOS tube is respectively connected to the drain of the first PMOS tube and the gate of the second PMOS tube, the drain of the first PMOS tube is connected to the drain of the first NMOS tube, the gate of the first NMOS tube is connected to the output end of the first switch unit, the source of the first NMOS tube is respectively connected to the source of the second NMOS tube and the first bias circuit, the drain of the second PMOS tube is respectively connected to the drain of the second NMOS tube, the first end of the first resistor, the first end of the first capacitor and the external load, the gate of the second NMOS tube is connected to the second end of the first resistor and the second end of the first capacitor, the first end of the third resistor is respectively connected to the second end of the first resistor, the second end of the first capacitor, and the gate of the second NMOS tube, and the second end of the third resistor is grounded.

[0011] It can be seen that the amplification unit of the present invention is realized by discrete components, which can achieve a higher driving voltage compared to the existing operational amplifier driving method. In addition, the output driving voltage depends on the withstand voltage and supply voltage of the field effect tube, and can be designed according to actual needs.

[0012] A further solution is that the first bias circuit includes a fourth resistor, a first triode and a second triode, the first end of the fourth resistor is grounded, the second end of the fourth resistor is respectively connected to the collector of the first triode, the base of the first triode, and the base of the second triode, the emitter of the first triode and the emitter of the second triode are respectively connected to the second power supply end, and the collector of the second triode is respectively connected to the source of the first NMOS tube and the source of the second NMOS tube.

[0013] A further solution is that the second selection input terminal of the first switch unit and the third selection input terminal of the second switch unit are respectively connected to the digital-to-analog converter built into the control unit; the first control terminal of the first switch unit and the second control terminal of the second switch unit are respectively connected to different general input and output pins of the control unit.

[0014] It can be seen that the amplified signal can be directly generated by the control unit according to actual needs, or directly received from an external signal, and is compatible with both input methods.

[0015] A further solution is that the system control module includes a first signal source selection key unit and a second signal source selection key unit, and the first signal source selection key unit and the second signal source selection key unit are respectively connected to the control unit.

[0016] It can be seen that the signal source can be selected by pressing a button, so that the control unit selects the signal source that needs to be amplified.

[0017] A further solution is that the system control module includes a communication interface, and the communication interface is connected to the control unit.

[0018] It can be seen from this that the output of the driving voltage can also be controlled by communicating with an external host computer, where the external host computer sends a control instruction to the control unit.

[0019] A further solution is a power supply module, which includes a linear voltage regulator module, a first DC conversion module and a second DC conversion module. The linear voltage regulator module is connected to the system control module, and the first DC conversion module and the second DC conversion module are connected to the voltage amplification module.

[0020] It can be seen that the power module supplies power by converting an overall input power supply voltage into the voltage required by other modules.

[0021] In order to achieve the above-mentioned second purpose, the present invention provides a high-voltage piezoelectric ceramic driver control method, which is applied to the above-mentioned high-voltage piezoelectric ceramic driver, wherein the control unit performs the following steps: obtaining the first input information of the first signal source selection button unit, and connecting the first selection input terminal or the second selection input terminal to the input terminal of the first amplification unit according to the first input information; obtaining the second input information of the second signal source selection button unit, and connecting the third selection input terminal or the fourth selection input terminal to the input terminal of the second amplification unit according to the second input information.

[0022] It can be seen from the above scheme that the present invention determines the selection of the signal source by acquiring the first input information and the second input information triggered by the user pressing a key, thereby facilitating the adjustment of the output of the driving voltage.

[0023] A further solution is that when the second selection input terminal is connected to the input terminal of the first amplifying unit, the control unit outputs the first preset signal to the input terminal of the first amplifying unit through the first switching unit; when the fourth selection input terminal is connected to the input terminal of the second amplifying unit, the control unit outputs the second preset signal to the input terminal of the second amplifying unit through the second switching unit.

[0024] It can be seen that directly generating the required first preset signal and second preset signal facilitates the setting of the amplified signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall framework of an embodiment of a high-voltage piezoelectric ceramic driver of the present invention.

[0026] Figure 2 It is a circuit schematic diagram of the first amplifying unit in the embodiment of the high-voltage piezoelectric ceramic driver of the present invention.

[0027] Figure 3 It is a schematic diagram of an oscilloscope detecting a driving voltage output according to an embodiment of a high-voltage piezoelectric ceramic driver of the present invention.

[0028] Figure 4 This is another schematic diagram of an oscilloscope detecting a driving voltage output in an embodiment of a high-voltage piezoelectric ceramic driver of the present invention.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] The high-voltage piezoelectric ceramic driver of the present invention is connected to an external piezoelectric ceramic through a voltage amplification module, and under the control of a system control module, a certain range of driving voltage is provided to the external piezoelectric ceramic through the voltage amplification module. The present invention also provides a control method for the high-voltage piezoelectric ceramic driver.

[0031] High voltage piezoelectric ceramic driver embodiment:

[0032] See also Figure 1 The high-voltage piezoelectric ceramic driver of this embodiment includes a system control module 1, a voltage amplification module 2, and a power supply module 3. The system control module 1 is connected to the voltage amplification module 2, and the power supply module 3 is connected to the system control module 1 and the voltage amplification module 2 respectively.

[0033] The system control module 1 comprises a control unit 11, a first switch unit 12, a second switch unit 13, a communication interface 14 and a key module 15. The control unit 11 is connected to the first switch unit 12, the second switch unit 13, the communication interface 14 and the key module 15 respectively.

[0034] The first selection input terminal of the first switch unit 12 is used to receive an external first signal 901. The second selection input terminal and the first control terminal of the first switch unit 12 are respectively connected to the control unit 11. The second selection input terminal of the first switch unit 12 is used to receive a first preset signal DAC1 from the control unit 11. The first control terminal of the first switch unit 12 is used to receive a first control signal GPIO1 from the control unit 11.

[0035] The third selection input terminal and the second control terminal of the second switch unit 13 are respectively connected to the control unit 11. The third selection input terminal of the second switch unit 13 is used to receive the second preset signal DAC2 from the control unit 11. The second control terminal of the second switch unit 13 is used to receive the second control signal GPIO2 from the control unit 11. The fourth selection input terminal of the second switch unit 13 is used to receive the external second signal 902.

[0036] The external first signal 901 and the external signal 902 may be derived from the pre-stage input circuit connected to the high-voltage piezoelectric ceramic driver of this embodiment. Two digital-to-analog converters are provided in the microcontroller unit 11, the second selection input terminal of the first switch unit 12 and the third selection input terminal of the second switch unit 13 are respectively connected to different digital-to-analog converters in the control unit, and the first preset signal DAC1 and the second preset signal DAC2 are respectively generated by corresponding digital-to-analog converters.

[0037] The first control terminal of the first switch unit 12 and the second control terminal of the second switch unit 13 are respectively connected to different general purpose input and output pins (GPIO) of the control unit 11. The control unit 11 outputs a first control signal GPIO1 and a second control signal GPIO2 through the general purpose input and output pins.

[0038] In this embodiment, the control unit 11 is a microcontroller unit (MCU). The first switch unit 12 and the second switch unit 13 are implemented by analog switch chips. The first switch unit 12 receives the first control signal GPIO1 from the first control terminal, thereby connecting the first selection input terminal or the second selection input terminal to the input terminal of the first amplifying unit 12. The second switch unit 13 receives the second control signal GPIO2 from the second control terminal, thereby connecting the third selection input terminal or the fourth selection input terminal to the input terminal of the second amplifying unit 12.

[0039] The communication interface 14 is used to communicate with an external host computer. In this embodiment, the control unit 11 obtains control instructions from the external host computer through the USART communication interface, and outputs the first preset signal DAC1, the second preset signal DAC2, the first control signal GPIO1 and the second control signal GPIO2 under the control instructions.

[0040] The key module 15 includes a first signal source selection key unit and a second signal source selection key unit, and the first signal source selection key unit and the second signal source selection key unit are respectively connected to the control unit 11. The first signal source selection key unit is used to generate first input information after the user presses its key, and the first input information triggers the control unit 11 to interrupt, so that the control unit 11 selects the first selection input terminal or the second selection input terminal to be connected to the input terminal of the first amplification unit according to the first input information. The first signal source selection key unit is used to generate second input information after the user presses its key, so that the control unit 11 selects the third selection input terminal or the fourth selection input terminal to be connected to the input terminal of the first amplification unit according to the second input information.

[0041] The power supply module 3 is used to provide working voltage for the system control module 1 and the voltage amplification module 2. The power supply module 3 includes a linear voltage regulator module 31, a first DC conversion module 32 and a second DC conversion module 33. The linear voltage regulator module 31 is connected to the system control module 1. The first DC conversion module 31 and the second DC conversion module 33 are respectively connected to the voltage amplification module 2.

[0042] In this embodiment, the high-voltage piezoelectric ceramic driver is powered by a 12V DC voltage. Specifically, the power input voltage of the power module 3 is a 12V DC voltage, the linear voltage regulator module 31 includes a linear voltage regulator chip (LDO), and the linear voltage regulator module 31 generates a 3.3V DC voltage through the linear voltage regulator chip to supply power to the system control module 1; the first DC conversion module 32 includes an isolated DC-DC power module, and the first DC conversion module 32 generates a 450V DC voltage through the isolated DC-DC power module to supply power to the voltage amplifier module 2; the second DC conversion module 33 includes a DC-DC chip, and the second DC conversion module 33 generates a -12V DC voltage through the DC-DC chip to supply power to the voltage amplifier module 2.

[0043] The voltage amplification module 2 includes a first amplification unit 21 and a second amplification unit 22. The input end of the first amplification unit 21 is connected to the output end of the first switch unit 12. The input end of the second amplification unit 22 is connected to the output end of the second switch unit 13. An external load, i.e., an external piezoelectric ceramic 4, is arranged between the output end of the first amplification unit 21 and the output end of the second amplification unit 22. The output end of the first amplification unit 21 generates a first high-voltage signal 210 and outputs it to the external piezoelectric ceramic 4, and the output end of the second amplification unit 22 generates a second high-voltage signal 220 and outputs it to the external piezoelectric ceramic 4.

[0044] See also Figure 2The first amplifying unit 21 of this embodiment includes a first differential circuit 211, a first feedback circuit 212 and a first bias circuit 213. The input end of the first differential circuit 21 is connected to the output end of the first switch unit 12, and receives an input signal from the output end of the first switch unit 12. The output end of the first differential circuit 211 is respectively connected to the first feedback circuit and the external piezoelectric ceramic 4. The first bias circuit 213 is used to provide a bias voltage for the first differential circuit 211.

[0045] The first differential circuit 211 includes a first PMOS transistor Q1, a second PMOS transistor Q2, a first NMOS transistor Q3 and a second NMOS transistor Q4. The first feedback circuit 212 includes a first resistor R1, a first capacitor C1 and a third resistor R3. The first bias circuit 213 includes a fourth resistor R4, a first transistor Q5 and a second transistor Q6.

[0046] The source of the first PMOS tube Q1 and the source of the second PMOS tube Q2 are connected to the first power supply terminal HV_450V. The gate of the first PMOS tube Q1 is connected to the drain of the first PMOS tube Q1 and the gate of the second PMOS tube Q2, respectively, and the drain of the first PMOS tube Q1 is connected to the drain of the first NMOS tube Q3. The gate of the first NMOS tube Q3 is connected to the output end of the first switch unit 12, and the input signal output from the output end of the first switch unit 12 is input to the gate of the first NMOS tube Q3 through the second resistor R2. The source of the first NMOS tube Q3 is connected to the source of the second NMOS tube Q4 and the first bias circuit 213. The drain of the second PMOS tube Q2 is connected to the drain Q4 of the second NMOS tube, the first end of the first resistor R1, the first end of the first capacitor C1 and the external piezoelectric ceramic 4. The gate of the second NMOS tube Q4 is connected to the second end of the first resistor R1 and the second end of the first capacitor C1. A first end of the third resistor R3 is respectively connected to the second end of the first resistor R1 , the second end of the first capacitor C1 , and the gate of the second NMOS transistor Q4 , and a second end of the third resistor R4 is grounded.

[0047] The first end of the first resistor R1 is the end of the first resistor R1 away from the third resistor R3, and the second end of the first resistor R1 is the end of the first resistor R1 close to the third resistor R3. The first end of the first capacitor C1 is the end of the first capacitor C1 away from the third resistor R3, and the second end of the first capacitor C1 is the end of the first capacitor C1 close to the third resistor R3. The first end of the third resistor R3 is the end of the third resistor R3 close to the gate of the second NMOS transistor Q4, and the second end of the third resistor R3 is the end of the third resistor R3 away from the gate of the second NMOS transistor Q4. The amplification factor of the first amplifier unit 21 is determined by the configuration of the first resistors R1 and R3 of the first feedback circuit 212, and the amplification factor Au=(R1+R3) / R3.

[0048] The first end of the fourth resistor R4 is grounded, and the second end of the fourth resistor is respectively connected to the collector of the first transistor Q5, the base of the first transistor Q5, and the base of the second transistor Q6. The emitter of the first transistor Q5 and the emitter of the second transistor Q6 are respectively connected to the second power supply terminal, which provides a DC voltage of -12V. The collector of the second transistor Q6 is respectively connected to the source of the first NMOS transistor Q3 and the source of the second NMOS transistor Q4.

[0049] The second amplifying unit includes a second differential circuit, a second feedback circuit and a second bias circuit, the input end of the second differential circuit is connected to the output end of the second switch unit, the output end of the second differential circuit is respectively connected to the second feedback circuit and the external load, and the second bias circuit is used to provide a bias voltage for the second differential circuit. The second amplifying unit 22 is the same as the first amplifying unit 21, that is, the second differential circuit of the second amplifying unit 22 has the same structure as the first differential circuit 211, the second feedback circuit of the second amplifying unit 22 has the same structure as the first feedback circuit 212, and the second bias circuit of the second amplifying unit 22 has the same structure as the first bias 213, and the specific structure is not repeated here. Of course, according to the actual design, the second amplifying unit 22 may also be slightly different from the specific structure of the first amplifying unit 21, for example, the value of the resistor and the capacitor, or the voltage of the second power supply end connected to the second differential circuit of the second amplifying unit 22 (the voltage can be provided by the power module 3 by setting a third DC conversion module) can be different from the voltage of the first power supply end connected to the first differential circuit. In this embodiment, the second differential circuit of the second amplifier unit 22 is also connected to the first power supply terminal HV_450V. The difference between the second amplifier unit 22 and the first amplifier unit 21 lies in the setting of the input signal and the output signal, wherein the input end of the second differential circuit in the second amplifier unit 22 is connected to the output end of the second switch unit 12, and the corresponding input signal is obtained from the output end of the second switch unit 12, and the output end of the second differential circuit in the second amplifier unit 22 is connected to the other end of the external piezoelectric ceramic 4 to provide a second high voltage signal 220.

[0050] Under the control of the system control unit 1, the external piezoelectric ceramic 4 is driven by the first amplifying unit 21 and the second amplifying unit 22. When the first amplifying unit 21 is controlled to output alone, or when the second amplifying unit 22 is controlled to output alone, the driving voltage range for the external piezoelectric ceramic 4 is 0 to 450V; when the first amplifying unit 21 and the second amplifying unit 22 are controlled to output together, the driving voltage range for the external piezoelectric ceramic 4 is -450V to 450V.

[0051] See also Figure 3 , Figure 3The schematic diagram shows an oscilloscope detecting the voltage across the external piezoelectric ceramic 4. It can be seen that the voltage across the external piezoelectric ceramic 4 reaches 300V, while the voltage range that can be provided by the existing high-voltage operational amplifier is less than 250V. This embodiment can provide a larger driving voltage.

[0052] join Figure 4 , Figure 4 Another schematic diagram of the oscilloscope detecting the output voltage is shown. The yellow part is the waveform of the first high voltage signal 210 detected by oscilloscope channel 1, the red part is the waveform of the second high voltage signal 220 detected by oscilloscope channel 2, and the pink part is the difference between the first high voltage signal 210 and the second high voltage signal 220 (i.e., the voltage across the piezoelectric ceramic 4) detected by the oscilloscope.

[0053] Control method embodiment of high voltage piezoelectric ceramic driver:

[0054] The control method based on the high-voltage piezoelectric ceramic driver of this embodiment is implemented by the control unit through executing a computer program.

[0055] The control unit obtains the first input information of the first signal source selection button unit, and outputs the first control signal to the first control end of the first switch unit according to the first input information, thereby connecting the first selection input end or the second selection input end to the input end of the first amplifying unit; or, the control unit obtains the control instruction from the external host computer based on the communication interface, and outputs the first control instruction to the first control end of the first switch unit according to the control instruction, thereby connecting the first selection input end or the second selection input end to the input end of the first amplifying unit.

[0056] The control unit obtains the second input information of the second signal source selection button unit, and outputs the second control signal to the second control end of the second switch unit according to the second input information, thereby connecting the third selection input end or the fourth selection input end to the input end of the second amplifying unit; or, the control unit obtains the control instruction from the external host computer based on the communication interface, and outputs the second control signal to the second control end of the second switch unit according to the control instruction, thereby connecting the third selection input end or the fourth selection input end to the input end of the second amplifying unit.

[0057] When the first selection input terminal is connected to the input terminal of the first amplifying unit, the external first signal is output to the input terminal of the first amplifying unit through the first switch unit. At this time, the first high-voltage signal is the amplified external first signal output by the output terminal of the first amplifying unit.

[0058] When the second selection input terminal is connected to the input terminal of the first amplifying unit, the control unit outputs the first preset signal to the input terminal of the first amplifying unit through the first switch unit. At this time, the first high voltage signal is the amplified first preset signal output by the output terminal of the first amplifying unit.

[0059] The waveform of the first preset signal is realized through programming and can be set according to actual needs.

[0060] When the third selection input terminal is connected to the input terminal of the second amplifying unit, the control unit outputs the second preset signal to the input terminal of the second amplifying unit through the first switch unit. At this time, the second high voltage signal is the amplified second preset signal output by the output terminal of the second amplifying unit. The waveform of the second preset signal is realized by programming and can be set according to actual needs.

[0061] When the fourth selection input terminal is connected to the input terminal of the second amplifying unit, the external second signal is output to the input terminal of the second amplifying unit through the second switch unit. At this time, the second high voltage signal is the amplified external second signal output by the output terminal of the second amplifying unit.

[0062] In summary, the present invention selects the first amplifying unit and / or the second amplifying unit of the voltage amplifying module to drive the external load through the system control module, and the signal input to the voltage amplifying module can be selected from the external signal or the internal output signal of the control unit. The present invention has a higher driving voltage output, which can meet the requirements of high-voltage driven piezoelectric ceramics, and outputs of different driving voltage ranges can be achieved by selecting the first amplifying unit and / or the second amplifying unit. In addition, the overall structure of the present invention is simple and the implementation cost is low.

[0063] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention, such as the first amplification unit and the second amplification unit being implemented by operational amplifiers respectively, should be included in the protection scope of the present invention.

Claims

1. A high voltage piezoelectric ceramic driver, characterized in that: include: System control module and voltage amplification module; The system control module includes a control unit, a first switch unit, and a second switch unit. The first selection input terminal of the first switch unit is used to receive an external first signal. The second selection input terminal and the first control terminal of the first switch unit are respectively connected to the control unit. The third selection input terminal and the second control terminal of the second switch unit are respectively connected to the control unit. The fourth selection input terminal of the second switch unit is used to receive an external second signal. The voltage amplification module includes a first amplification unit and a second amplification unit, the input end of the first amplification unit is connected to the output end of the first switch unit, the input end of the second amplification unit is connected to the output end of the second switch unit, and an external load is set between the output end of the first amplification unit and the output end of the second amplification unit.

2. The high voltage piezoelectric ceramic driver according to claim 1, characterized in that: The first amplifying unit includes a first differential circuit, a first feedback circuit and a first bias circuit, the input end of the first differential circuit is connected to the output end of the first switch unit, the output end of the first differential circuit is respectively connected to the first feedback circuit and the external load, and the first bias circuit is used to provide a bias voltage for the first differential circuit; The second amplification unit includes a second differential circuit, a second feedback circuit and a second bias circuit, the input end of the second differential circuit is connected to the output end of the second switch unit, the output end of the second differential circuit is respectively connected to the second feedback circuit and the external load, and the second bias circuit is used to provide a bias voltage for the second differential circuit.

3. The high voltage piezoelectric ceramic driver according to claim 2, characterized in that: The first differential circuit includes a first PMOS transistor, a second PMOS transistor, a first NMOS transistor and a second NMOS transistor, and the first feedback circuit includes a first resistor, a first capacitor and a third resistor; The source of the first PMOS tube and the source of the second PMOS tube are connected to the first power supply end, the gate of the first PMOS tube is respectively connected to the drain of the first PMOS tube and the gate of the second PMOS tube, the drain of the first PMOS tube is connected to the drain of the first NMOS tube, the gate of the first NMOS tube is connected to the output end of the first switch unit, the source of the first NMOS tube is respectively connected to the source of the second NMOS tube and the first bias circuit, the drain of the second PMOS tube is respectively connected to the drain of the second NMOS tube, the first end of the first resistor, the first end of the first capacitor and the external load, the gate of the second NMOS tube is connected to the second end of the first resistor and the second end of the first capacitor, the first end of the third resistor is respectively connected to the second end of the first resistor, the second end of the first capacitor and the gate of the second NMOS tube, and the second end of the third resistor is grounded.

4. The high voltage piezoelectric ceramic driver according to claim 3, characterized in that: The first bias circuit includes a fourth resistor, a first transistor and a second transistor, the first end of the fourth resistor is grounded, the second end of the fourth resistor is respectively connected to the collector of the first transistor, the base of the first transistor, and the base of the second transistor, the emitter of the first transistor and the emitter of the second transistor are respectively connected to the second power supply end, and the collector of the second transistor is respectively connected to the source of the first NMOS tube and the source of the second NMOS tube.

5. The high voltage piezoelectric ceramic driver according to claim 1, characterized in that: The second selection input terminal of the first switch unit and the third selection input terminal of the second switch unit are respectively connected to the digital-to-analog converter built into the control unit; The first control end of the first switch unit and the second control end of the second switch unit are respectively connected to different general input and output pins of the control unit.

6. The high voltage piezoelectric ceramic driver according to claim 1, characterized in that: The system control module includes a first signal source selection key unit and a second signal source selection key unit, and the first signal source selection key unit and the second signal source selection key unit are respectively connected to the control unit.

7. The high voltage piezoelectric ceramic driver according to claim 1, characterized in that: The system control module includes a communication interface, and the communication interface is connected to the control unit.

8. The high-voltage piezoelectric ceramic driver according to any one of claims 1 to 7, characterized in that: Also includes: A power supply module, the power supply module includes a linear voltage regulator module, a first DC conversion module and a second DC conversion module, the linear voltage regulator module is connected to the system control module, and the first DC conversion module and the second DC conversion module are connected to the voltage amplification module.

9. A high-voltage piezoelectric ceramic driver control method, applied to the high-voltage piezoelectric ceramic driver according to any one of claims 1 to 8, characterized in that: The control unit performs the following steps: Acquire first input information of a first signal source selection key unit, and connect the first selection input terminal or the second selection input terminal to the input terminal of the first amplification unit according to the first input information; The second input information of the second signal source selection key unit is obtained, and the third selection input terminal or the fourth selection input terminal is connected to the input terminal of the second amplification unit according to the second input information.

10. The high voltage piezoelectric ceramic driver control method according to claim 9, characterized in that: When the second selection input terminal is connected to the input terminal of the first amplifying unit, the control unit outputs the first preset signal to the input terminal of the first amplifying unit through the first switch unit; When the fourth selection input terminal is connected to the input terminal of the second amplifying unit, the control unit outputs the second preset signal to the input terminal of the second amplifying unit through the second switch unit.

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