CN113556055A - Bipolar piezoelectric ceramic driving power supply - Google Patents
Bipolar piezoelectric ceramic driving power supply Download PDFInfo
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- CN113556055A CN113556055A CN202110848434.7A CN202110848434A CN113556055A CN 113556055 A CN113556055 A CN 113556055A CN 202110848434 A CN202110848434 A CN 202110848434A CN 113556055 A CN113556055 A CN 113556055A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a bipolar piezoelectric ceramic driving power supply which comprises a voltage-stabilized power supply module, a control signal generation module, a linear amplification circuit module and a load module, wherein the input end of the control signal generation module is connected with an input signal, the output end of the control signal generation module is connected with the input end of the linear amplification circuit module, the output voltage of the linear amplification circuit module drives the load module, and the output end of the load module is connected with the ground; the linear amplification circuit module comprises a first-stage operational amplifier and two channels which are integrated and used for reducing offset voltage and amplifying analog voltage of digital-to-analog conversion by one time, and a second-stage operational amplifier and two channels which are integrated and used for amplifying the analog voltage of the first-stage operational amplifier and outputting the amplified analog voltage. The bipolar linear operational amplifier piezoelectric ceramic driving power sources are mutually independent, two dual-channel chips are utilized to form two-stage bipolar operational amplifier, and the dual-channel linear operational amplifier piezoelectric ceramic driving power source has the advantages of high integration level, portability, high efficiency, high stability and the like, and has practical and practical value and wide application prospect.
Description
Technical Field
The invention relates to a piezoelectric ceramic driving power supply, in particular to a high-efficiency integrated bipolar piezoelectric ceramic driving power supply.
Background
With the rapid development of precision engineering and micro-fine engineering, submicron and nanoscale positioning technologies and micro-motion servo technologies have become key technologies of advanced subjects of micro-electro-mechanical systems, ultra-precision machining, microelectronics, optoelectronics, bioengineering and the like. The piezoelectric ceramics (PZT) has the advantages of high resolution, small volume, large output force, high frequency response, no heat generation, high response speed and the like, is a preferred driving element of the micro-displacement driver, has direct relation between the positioning precision and the frequency response characteristic of the PZT and a driving power supply thereof, and has adverse influence on the stability and the dynamic characteristic of the driving power supply due to the capacitance characteristic of the PZT. In practical use, the piezoelectric ceramic equivalent capacitance has large fluctuation along with environmental influence and input voltage change, and the stability of the driving power supply is influenced. At present, a 5-DOF precision positioning platform appears, a single channel cannot meet the current requirement, and a piezoelectric ceramic driving power supply circuit is complex and low in efficiency.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects in the prior art and provide a bipolar piezoelectric ceramic driving power supply which is simple in structure, high in efficiency, integrated and low in ripple.
The technical scheme is as follows: a bipolar piezoelectric ceramic driving power supply comprises a voltage-stabilized power supply module, a control signal generation module, a linear amplification circuit module and a load module,
the input end of the control signal generation module is connected with an input signal, the output end of the control signal generation module is connected with the input end of the linear amplification circuit module, the output voltage of the linear amplification circuit module drives the load module, and the output end of the load module is connected with the ground;
the voltage-stabilized power supply module comprises a positive and negative low-voltage direct-current power supply and a positive and negative high-voltage direct-current power supply, and the positive and negative low-voltage direct-current power supply supplies power for the control signal generation module and the linear amplification circuit module; the positive and negative high-voltage direct-current power supply supplies power to the linear amplification circuit module;
the linear amplification circuit module comprises a first-stage operational amplifier integrating two channels for reducing offset voltage and amplifying analog voltage of digital-to-analog conversion by one time, a second-stage operational amplifier integrating two channels for amplifying the analog voltage of the first-stage operational amplifier and outputting the amplified analog voltage, and double-channel isolation feedback stability compensation is added at the output end of the second-stage operational amplifier to prevent self-oscillation.
Furthermore, the control signal generation module comprises a display screen and a voltage, a waveform model and a channel required by keyboard operation, a program is converted into a binary system and is transmitted to a core processing calling program through an interface, the output end of the core processing is connected with the input end of digital-to-analog conversion, the called program is transmitted to the digital-to-analog conversion and adopts two-core digital-to-analog conversion, and a received digital signal is converted into two paths of analog voltage values to be output.
Furthermore, the linear amplifying circuit module consists of two stages of operational amplifiers, each stage of operational amplifier consists of two channels, each two channels are integrated into a whole,
a pin 1 at the non-inverting end of the first-stage operational amplifier is connected with a resistor R5 and then connected with a pin 2 at the non-inverting end of the second-stage operational amplifier, the pin 1 is connected with the anode of a diode D1 and then connected with positive low voltage, and the pin 1 is connected with the cathode of a diode D2 and then connected with negative low voltage;
the pin 2 of the first-stage operational amplifier is connected with a resistor R3 and then grounded, the pin 2 is connected with a resistor R18 and then respectively connected with a first end of a resistor R12 and a first end of an isolation resistor Riso1, the second end of the resistor R12 is connected with the pin 1 of the second-stage operational amplifier, the second end of the isolation resistor Riso1 is connected with the pin 18 of the second-stage operational amplifier, and the resistor R18 is connected with a capacitor C15 in parallel;
a pin 3 of the first-stage operational amplifier is connected with a resistor R1 and then is connected with an analog voltage signal output by digital-to-analog conversion;
a pin 4 of the first-stage operational amplifier is connected with a negative low voltage, the pin 4 is connected with the positive electrode of a capacitor C1 and then grounded, and a capacitor C1 is connected with a capacitor C2 in parallel;
a pin 5 of the first-stage operational amplifier is connected with a resistor R2 and then is connected with an analog voltage signal output by digital-to-analog conversion;
the pin 6 of the first-stage operational amplifier is connected with the resistor R4 and then grounded, the pin 6 is connected with the resistor R11 and then respectively connected with the first end of the resistor R15 and the first end of the isolation resistor Riso2, the second end of the resistor R15 is connected with the pin 7 of the second-stage operational amplifier, the second end of the isolation resistor Riso2 is connected with the pin 15 of the second-stage operational amplifier, and the resistor R11 is connected with the capacitor C14 in parallel;
a pin 7 at the non-inverting terminal of the first-stage operational amplifier is connected with a resistor R6 and then connected with a pin 8 at the non-inverting terminal of the second-stage operational amplifier; pin 7 is connected with the anode of the diode D3 and then connected with positive low voltage, and pin 7 is connected with the cathode of the diode D4 and then connected with negative low voltage;
the pin 8 of the first-stage operational amplifier is connected with positive low voltage, the pin 8 is grounded after being connected with the anode of the capacitor C3, and the capacitor C4 is connected with the capacitor C3 in parallel.
Furthermore, pins 1 to 5 and pins 16 to 20 of the second-stage operational amplifier are channels a, and pins 6 to 15 are channels B;
a pin 1 of the second-stage operational amplifier is connected with a resistor R7 and then grounded, the pin 1 is connected with the anode of a diode D5 and then connected with a pin 2, the pin 1 is connected with the cathode of a diode D6 and then connected with the pin 2, and a capacitor C10 is connected between the pin 1 and a pin 18 in series;
a pin 3 of the second-stage operational amplifier is connected with a resistor R13 and then connected with a first end of a capacitor C11, a second end of C11 is connected with a pin 19 of the second-stage operational amplifier, and a second end of C11 is connected with a capacitor C12 in series and then connected with a pin 20 of the second-stage operational amplifier;
the pin 4 of the second-stage operational amplifier is sequentially connected with a resistor R9 and a capacitor C7 in series and then connected with a pin 5;
a pin 6 of the second-stage operational amplifier is connected with a negative high voltage, the pin 6 is grounded after being connected with the positive electrode of a capacitor C5, and a capacitor C6 is connected with a capacitor C5 in parallel; the pin 6 is connected with the first end of the capacitor C9, the second end of the C9 is connected with the pin 13, and the second end of the C9 is sequentially connected with the capacitor C8 and the resistor R10 in series and then connected with the pin 10;
a pin 7 of the second-stage operational amplifier is connected with a resistor R8 and then grounded, the pin 7 is connected with the anode of a diode D7 and then connected with a pin 8, the pin 7 is connected with the cathode of a diode D8 and then connected with the pin 8, and a capacitor C16 is connected between the pin 15 and the pin 7 in series;
the pin 9 of the second-stage operational amplifier is sequentially connected with a resistor R14 and a capacitor C13 in series and then connected with a pin 11;
a pin 12 of the second-stage operational amplifier is connected with positive high voltage, the pin 12 is grounded after being connected with the anode of a capacitor C17, and a capacitor C18 is connected with a capacitor C17 in parallel;
a pin 14 of the second-stage operational amplifier is connected with a pin 15 after being connected with a resistor R17 in series;
a pin 16 of the second-stage operational amplifier is connected with positive high voltage, the pin 16 is grounded after being connected with the anode of a capacitor C21, and a capacitor C22 is connected with a capacitor C21 in parallel;
a pin 17 of the second-stage operational amplifier is connected with a pin 18 after being connected with a resistor R16 in series;
the first end of the isolation resistor Riso2 is connected with the anode of the diode D11 and then connected with positive high voltage, the first end of the isolation resistor Riso is connected with the cathode of the diode D12 and then connected with negative high voltage, and the first end of the isolation resistor Riso is connected with the capacitor Cpzt2 and then grounded;
the first end of the isolation resistor Riso1 is connected with the anode of the diode D9 and then connected with a positive high voltage, the first end is connected with the cathode of the diode D10 and then connected with a negative high voltage, and the first end is connected with the capacitor Cpzt1 and then grounded.
Further, the resistors R18 and R3 are adjustable resistors, and the ratio of R18 to R3 is used for determining the amplification factor of the output voltage and the input voltage of the A channel; the resistors R11 and R4 are adjustable resistors, the ratio of R11 to R4 is used for determining the amplification factor of the output voltage and the input voltage of the B channel, and the capacitors C14 and C15 are used for dynamic following of the power supply.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) compared with the traditional piezoelectric ceramic driving power supply, the bipolar linear operational amplifier piezoelectric ceramic driving power supply is mutually independent and is not packaged together, so that the efficiency is reduced due to environmental factors and the like, and the two-stage bipolar operational amplifier is formed by two double-channel chips, so that the size is reduced, and the portable and high-efficiency piezoelectric ceramic driving power supply is portable;
(2) according to the invention, the channel A and the channel B both adopt two-stage operational amplifiers, so that the offset voltage can be reduced by one time of voltage amplification;
(3) the stability compensation of double-channel isolation feedback is added in each channel to prevent self-oscillation;
(4) the invention adds capacitors on the pins Cc-A, -VsA, Cc-B and-VsB, which is used for preventing the oscillation generated by the falling edge of the output end;
(5) the invention designs a signal generator by utilizing the singlechip, which has good human-computer interaction and powerful functions, the embedded development selects the required functions according to the keyboard and the display screen, the conversion of data and analog signals can be carried out by utilizing digital-to-analog conversion, and the signal generator can emit waveforms such as sine waves, square waves, triangular waves, sawtooth waves and the like;
(6) the invention is a driving power supply with high efficiency, simple structure, integration and low ripple.
Drawings
FIG. 1 is a general schematic block diagram of a piezoelectric ceramic driving power supply according to the present invention;
FIG. 2 is a main circuit diagram of the present invention;
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the present invention provides a bipolar piezoelectric ceramic driving power supply, which includes a voltage-stabilized power supply module, a control signal generation module, a linear amplification circuit module, and a load module:
the input end of the control signal generation module is connected with an input signal, the output end of the control signal generation module is connected with the input end of the linear amplification circuit module, the output voltage of the linear amplification circuit module drives the load module, and the output end of the load module is connected with the ground;
the voltage-stabilized power supply module comprises a positive and negative low-voltage direct-current power supply and a positive and negative high-voltage direct-current power supply, and the positive and negative low-voltage direct-current power supply supplies power for the control signal generation module and the linear amplification circuit module; the positive and negative high-voltage direct-current power supply supplies power to the linear amplification circuit module;
the linear amplification circuit module comprises a first-stage operational amplifier integrating two channels for reducing offset voltage and amplifying analog voltage of digital-to-analog conversion by one time, a second-stage operational amplifier integrating two channels for amplifying the analog voltage of the first-stage operational amplifier and outputting the amplified analog voltage, and double-channel isolation feedback stability compensation is added at the output end of the second-stage operational amplifier to prevent self-oscillation.
The control signal generation module comprises a display screen and a voltage, a waveform model and a channel required by keyboard operation, a program is converted into a binary system and is transmitted to a core processing calling program through an interface, the output end of the core processing is connected with the input end of digital-to-analog conversion, the called program is transmitted to the digital-to-analog conversion and adopts two-core digital-to-analog conversion, and a received digital signal is converted into two paths of analog voltage values to be output.
As shown in the left half of fig. 2, the linear amplification circuit module is composed of two stages of operational amplifiers, each stage of operational amplifier is composed of two channels, each two channels are integrated into a whole,
a pin 1 at the non-inverting end of the first-stage operational amplifier is connected with a resistor R5 and then connected with a pin 2 at the non-inverting end of the second-stage operational amplifier, the pin 1 is connected with the anode of a diode D1 and then connected with positive low voltage, and the pin 1 is connected with the cathode of a diode D2 and then connected with negative low voltage;
the pin 2 of the first-stage operational amplifier is connected with a resistor R3 and then grounded, the pin 2 is connected with a resistor R18 and then respectively connected with a first end of a resistor R12 and a first end of an isolation resistor Riso1, the second end of the resistor R12 is connected with the pin 1 of the second-stage operational amplifier, the second end of the isolation resistor Riso1 is connected with the pin 18 of the second-stage operational amplifier, and the resistor R18 is connected with a capacitor C15 in parallel;
a pin 3 of the first-stage operational amplifier is connected with a resistor R1 and then is connected with an analog voltage signal output by digital-to-analog conversion;
a pin 4 of the first-stage operational amplifier is connected with a negative low voltage, the pin 4 is connected with the positive electrode of a capacitor C1 and then grounded, and a capacitor C1 is connected with a capacitor C2 in parallel;
a pin 5 of the first-stage operational amplifier is connected with a resistor R2 and then is connected with an analog voltage signal output by digital-to-analog conversion;
the pin 6 of the first-stage operational amplifier is connected with the resistor R4 and then grounded, the pin 6 is connected with the resistor R11 and then respectively connected with the first end of the resistor R15 and the first end of the isolation resistor Riso2, the second end of the resistor R15 is connected with the pin 7 of the second-stage operational amplifier, the second end of the isolation resistor Riso2 is connected with the pin 15 of the second-stage operational amplifier, and the resistor R11 is connected with the capacitor C14 in parallel;
a pin 7 at the non-inverting terminal of the first-stage operational amplifier is connected with a resistor R6 and then connected with a pin 8 at the non-inverting terminal of the second-stage operational amplifier; pin 7 is connected with the anode of the diode D3 and then connected with positive low voltage, and pin 7 is connected with the cathode of the diode D4 and then connected with negative low voltage;
the pin 8 of the first-stage operational amplifier is connected with positive low voltage, the pin 8 is grounded after being connected with the anode of the capacitor C3, and the capacitor C4 is connected with the capacitor C3 in parallel.
Preferably, the first-stage operational amplifier chip adopts OPA2277UK, the left side is an A-channel first-stage operational amplifier channel, the right side is a B-channel first-stage operational amplifier, the power supply pins are V-, V +, the negative low voltage is-15V, the positive low voltage is +15V, C1, C2, C3 and C4 are added at two ends of the power supply for filtering out alternating current, analog voltage signals output by digital-to-analog conversion are connected into + INA and + INB non-inverting input ends, -INA and-INB ends are grounded, the multiple of terminal voltage between the output end and the input end is adjusted by adjustable resistors R18 and R3 and adjustable resistors R11 and R4 at the output end of the second-stage operational amplifier, C15 and C14 are used for smoothing, the OUTA and OUTB are connected with the + INA and + INB non-inverting input ends, and D1 and D2 are 1N4007, and have the function of output end voltage protection.
As shown in the right half of fig. 2, pins 1 to 5 and pins 16 to 20 of the second stage operational amplifier are channels a, and pins 6 to 15 are channels B;
a pin 1 of the second-stage operational amplifier is connected with a resistor R7 and then grounded, the pin 1 is connected with the anode of a diode D5 and then connected with a pin 2, the pin 1 is connected with the cathode of a diode D6 and then connected with the pin 2, and a capacitor C10 is connected between the pin 1 and a pin 18 in series;
a pin 3 of the second-stage operational amplifier is connected with a resistor R13 and then connected with a first end of a capacitor C11, a second end of C11 is connected with a pin 19 of the second-stage operational amplifier, and a second end of C11 is connected with a capacitor C12 in series and then connected with a pin 20 of the second-stage operational amplifier;
the pin 4 of the second-stage operational amplifier is sequentially connected with a resistor R9 and a capacitor C7 in series and then connected with a pin 5;
a pin 6 of the second-stage operational amplifier is connected with a negative high voltage, the pin 6 is grounded after being connected with the positive electrode of a capacitor C5, and a capacitor C6 is connected with a capacitor C5 in parallel; the pin 6 is connected with the first end of the capacitor C9, the second end of the C9 is connected with the pin 13, and the second end of the C9 is sequentially connected with the capacitor C8 and the resistor R10 in series and then connected with the pin 10;
a pin 7 of the second-stage operational amplifier is connected with a resistor R8 and then grounded, the pin 7 is connected with the anode of a diode D7 and then connected with a pin 8, the pin 7 is connected with the cathode of a diode D8 and then connected with the pin 8, and a capacitor C16 is connected between the pin 15 and the pin 7 in series;
the pin 9 of the second-stage operational amplifier is sequentially connected with a resistor R14 and a capacitor C13 in series and then connected with a pin 11;
a pin 12 of the second-stage operational amplifier is connected with positive high voltage, the pin 12 is grounded after being connected with the anode of a capacitor C17, and a capacitor C18 is connected with a capacitor C17 in parallel;
a pin 14 of the second-stage operational amplifier is connected with a pin 15 after being connected with a resistor R17 in series;
a pin 16 of the second-stage operational amplifier is connected with positive high voltage, the pin 16 is grounded after being connected with the anode of a capacitor C21, and a capacitor C22 is connected with a capacitor C21 in parallel;
a pin 17 of the second-stage operational amplifier is connected with a pin 18 after being connected with a resistor R16 in series;
the first end of the isolation resistor Riso2 is connected with the anode of the diode D11 and then connected with positive high voltage, the first end is connected with the cathode of the diode D12 and then connected with negative high voltage, and the first end is connected with the piezoelectric ceramic Cpzt2 and then grounded;
the first end of the isolation resistor Riso1 is connected with the anode of the diode D9 and then connected with positive high voltage, the first end is connected with the cathode of the diode D10 and then connected with negative high voltage, and the first end is connected with the piezoelectric ceramic Cpzt1 and then grounded.
Preferably, the second-stage operational amplifier chip adopts PA79DK, the upper half part is an A-channel pin, the lower half part is a B-channel pin, double-path positive and negative power supply is adopted, the + VsA, + VsB is 168V, -VsA, -VsB is-168V, C5, C6, C17, C18, C19, C20, C21 and C22 are used for filtering alternating current, phase compensation is composed of positive compensation R9, C7, R14 and C13, negative compensation is composed of R13, C11, R10 and C8, bandwidth can be improved, and circuit stability is improved; c12 and C9 are added to pins Cc-A, -VsA and Cc-B, -VsB, and are used for preventing oscillation generated by the falling edge of the output end; d5, D6, D7 and D8 are input end protection diodes, D9, D10, D11 and D12 are output end protection diodes, R16 and R17 are current-limiting resistors, the output voltage of the AB channel is about 180mA, and a 1W high-precision resistor is used.
The internal resistance of the output end of the operational amplifier and the equivalent capacitor of the piezoelectric stack form a low-pass network, the RC network can make the phase margin of the amplifier lower, thereby causing self-oscillation, the internal resistance is in pins VOUTA and VOUTB of PA79DK, an isolation resistor Riso1 and a feedback capacitor C10 are added to the output end of VOUTA, R12 and R7 are feedback resistors, an isolation resistor Rios2 and a feedback capacitor C16 are added to the output end of VOUTB, and R15 and R8 are feedback resistors, so that the circuit is stable.
The embodiments of the present invention are not described in detail, but are known in the art, and can be implemented by referring to the known techniques.
Claims (5)
1. A bipolar piezoelectric ceramic driving power supply is characterized by comprising a voltage-stabilized power supply module, a control signal generation module, a linear amplification circuit module and a load module,
the input end of the control signal generation module is connected with an input signal, the output end of the control signal generation module is connected with the input end of the linear amplification circuit module, the output voltage of the linear amplification circuit module drives the load module, and the output end of the load module is connected with the ground;
the voltage-stabilized power supply module comprises a positive and negative low-voltage direct-current power supply and a positive and negative high-voltage direct-current power supply, and the positive and negative low-voltage direct-current power supply supplies power for the control signal generation module and the linear amplification circuit module; the positive and negative high-voltage direct-current power supply supplies power to the linear amplification circuit module;
the linear amplification circuit module comprises a first-stage operational amplifier and two channels which are used for reducing offset voltage and amplifying analog voltage of digital-to-analog conversion by one time, and a second-stage operational amplifier and two channels which are used for amplifying the analog voltage of the first-stage operational amplifier and outputting the amplified analog voltage, wherein the two channels are integrated, and the stability compensation of feedback is isolated by adding two channels at the output end of the second-stage operational amplifier.
2. The bipolar piezoceramic driving power supply according to claim 1, wherein the control signal generation module comprises a voltage, a waveform model and a channel required by the operation of a display screen and a keyboard, the voltage, the waveform model and the channel are converted into a binary system by a program and transmitted to a core processing calling program through an interface, an output end of the core processing is connected with an input end of digital-to-analog conversion, the called program is transmitted to the digital-to-analog conversion, two-core digital-to-analog conversion is adopted, and a received digital signal is converted into two paths of analog voltage values to be output.
3. The bipolar piezoceramic driving power supply according to claim 1, wherein the linear amplification circuit module is composed of two stages of operational amplifiers, each stage of operational amplifier is composed of two channels, each two channels are integrated into a whole,
pins 1 to 4 of the first-stage operational amplifier are channels A, and pins 5 to 8 are channels B;
a pin 1 at the non-inverting end of the first-stage operational amplifier is connected with a resistor R5 and then connected with a pin 2 at the non-inverting end of the second-stage operational amplifier, the pin 1 is connected with the anode of a diode D1 and then connected with positive low voltage, and the pin 1 is connected with the cathode of a diode D2 and then connected with negative low voltage;
the pin 2 of the first-stage operational amplifier is connected with a resistor R3 and then grounded, the pin 2 is connected with a resistor R18 and then respectively connected with a first end of a resistor R12 and a first end of an isolation resistor Riso1, the second end of the resistor R12 is connected with the pin 1 of the second-stage operational amplifier, the second end of the isolation resistor Riso1 is connected with the pin 18 of the second-stage operational amplifier, and the resistor R18 is connected with a capacitor C15 in parallel;
a pin 3 of the first-stage operational amplifier is connected with a resistor R1 and then is connected with an analog voltage signal output by digital-to-analog conversion;
a pin 4 of the first-stage operational amplifier is connected with a negative low voltage, the pin 4 is connected with the positive electrode of a capacitor C1 and then grounded, and a capacitor C1 is connected with a capacitor C2 in parallel;
a pin 5 of the first-stage operational amplifier is connected with a resistor R2 and then is connected with an analog voltage signal output by digital-to-analog conversion;
the pin 6 of the first-stage operational amplifier is connected with the resistor R4 and then grounded, the pin 6 is connected with the resistor R11 and then respectively connected with the first end of the resistor R15 and the first end of the isolation resistor Riso2, the second end of the resistor R15 is connected with the pin 7 of the second-stage operational amplifier, the second end of the isolation resistor Riso2 is connected with the pin 15 of the second-stage operational amplifier, and the resistor R11 is connected with the capacitor C14 in parallel;
a pin 7 at the non-inverting terminal of the first-stage operational amplifier is connected with a resistor R6 and then connected with a pin 8 at the non-inverting terminal of the second-stage operational amplifier; pin 7 is connected with the anode of the diode D3 and then connected with positive low voltage, and pin 7 is connected with the cathode of the diode D4 and then connected with negative low voltage;
the pin 8 of the first-stage operational amplifier is connected with positive low voltage, the pin 8 is grounded after being connected with the anode of the capacitor C3, and the capacitor C4 is connected with the capacitor C3 in parallel.
4. The bipolar piezoceramic driving power supply according to claim 3, wherein pins 1 to 5 and pins 16 to 20 of the second stage operational amplifier are channels A, and pins 6 to 15 are channels B;
a pin 1 of the second-stage operational amplifier is connected with a resistor R7 and then grounded, the pin 1 is connected with the anode of a diode D5 and then connected with a pin 2, the pin 1 is connected with the cathode of a diode D6 and then connected with the pin 2, and a capacitor C10 is connected between the pin 1 and a pin 18 in series;
a pin 3 of the second-stage operational amplifier is connected with a resistor R13 and then connected with a first end of a capacitor C11, a second end of C11 is connected with a pin 19 of the second-stage operational amplifier, and a second end of C11 is connected with a capacitor C12 in series and then connected with a pin 20 of the second-stage operational amplifier;
the pin 4 of the second-stage operational amplifier is sequentially connected with a resistor R9 and a capacitor C7 in series and then connected with a pin 5;
a pin 6 of the second-stage operational amplifier is connected with a negative high voltage, the pin 6 is grounded after being connected with the positive electrode of a capacitor C5, and a capacitor C6 is connected with a capacitor C5 in parallel; the pin 6 is connected with the first end of the capacitor C9, the second end of the C9 is connected with the pin 13, and the second end of the C9 is sequentially connected with the capacitor C8 and the resistor R10 in series and then connected with the pin 10;
a pin 7 of the second-stage operational amplifier is connected with a resistor R8 and then grounded, the pin 7 is connected with the anode of a diode D7 and then connected with a pin 8, the pin 7 is connected with the cathode of a diode D8 and then connected with the pin 8, and a capacitor C16 is connected between the pin 15 and the pin 7 in series;
the pin 9 of the second-stage operational amplifier is sequentially connected with a resistor R14 and a capacitor C13 in series and then connected with a pin 11;
a pin 12 of the second-stage operational amplifier is connected with positive high voltage, the pin 12 is grounded after being connected with the anode of a capacitor C17, and a capacitor C18 is connected with a capacitor C17 in parallel;
a pin 14 of the second-stage operational amplifier is connected with a pin 15 after being connected with a resistor R17 in series;
a pin 16 of the second-stage operational amplifier is connected with positive high voltage, the pin 16 is grounded after being connected with the anode of a capacitor C21, and a capacitor C22 is connected with a capacitor C21 in parallel;
a pin 17 of the second-stage operational amplifier is connected with a pin 18 after being connected with a resistor R16 in series;
the first end of the isolation resistor Riso2 is connected with the anode of the diode D11 and then connected with positive high voltage, the first end is connected with the cathode of the diode D12 and then connected with negative high voltage, and the first end is connected with the piezoelectric ceramic Cpzt2 and then grounded;
the first end of the isolation resistor Riso1 is connected with the anode of the diode D9 and then connected with positive high voltage, the first end is connected with the cathode of the diode D10 and then connected with negative high voltage, and the first end is connected with the piezoelectric ceramic Cpzt1 and then grounded.
5. The bipolar piezoceramic driving power supply according to claim 3, wherein the resistors R18 and R3 are adjustable resistors, and the ratio of R18 to R3 is used for determining the amplification factor of the output voltage to the input voltage of the A channel; the resistors R11 and R4 are adjustable resistors, the ratio of R11 to R4 is used for determining the amplification factor of the output voltage and the input voltage of the B channel, and the capacitors C14 and C15 are used for dynamic following of the power supply.
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