CN113676027A - High-voltage driving circuit for piezoelectric ceramic material - Google Patents
High-voltage driving circuit for piezoelectric ceramic material Download PDFInfo
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- CN113676027A CN113676027A CN202110908939.8A CN202110908939A CN113676027A CN 113676027 A CN113676027 A CN 113676027A CN 202110908939 A CN202110908939 A CN 202110908939A CN 113676027 A CN113676027 A CN 113676027A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 relates to a high-voltage driving circuit for a piezoelectric ceramic material, which comprises a high-voltage source circuit, a positive and negative driving circuit and an external excitation circuit, wherein the high-voltage source circuit is electrically connected with the positive and negative driving circuit; the high-voltage source circuit is used for filtering the switching power supply, performing self-excited inversion on the filtered current and outputting direct-current high voltage; the external excitation circuit is used for receiving an external excitation signal, carrying out diode protection on the external excitation signal and then transmitting the external excitation signal to the positive and negative driving circuits; and the positive and negative driving circuit is used for adjusting the positive driving electronic tube flat level output voltage and the negative driving end output voltage according to the direct current high voltage and the external excitation signal. The high-voltage driving circuit for the piezoelectric ceramic material provided by the invention has the advantage that the response speed of the high-voltage driving circuit is improved.
Description
Technical Field
The invention relates to the technical field of high-voltage driving, in particular to a high-voltage driving circuit for a piezoelectric ceramic material.
Background
With the rapid development of smart power integrated circuits, the design of high voltage chips is receiving more and more attention. The high-voltage driving circuit is an indispensable important part in the design of a high-voltage chip, and requires large driving capability, high withstand voltage, small power consumption, high reliability and the like. Piezoelectric ceramics utilize the material to cause the relative displacement of the positive and negative charge centers in the piezoelectric ceramics under the action of mechanical stress to generate polarization, are used in the high-tech field, serve people in daily life more and make efforts to create better life for people. The existing high-voltage driving circuit for the piezoelectric ceramic material has the problems of insufficient driving performance and slow response speed of the high-voltage driving circuit.
Disclosure of Invention
In view of the above, there is a need to provide a high voltage driving circuit for piezoelectric ceramic materials, which solves the problem of slow response speed of the high voltage driving circuit.
The invention provides a high-voltage driving circuit for a piezoelectric ceramic material, which comprises a high-voltage source circuit, a positive and negative driving circuit and an external excitation circuit, wherein the high-voltage source circuit is electrically connected with the positive and negative driving circuit;
the high-voltage source circuit is used for filtering the switching power supply, performing self-excited inversion on the filtered current and outputting direct-current high voltage;
the external excitation circuit is used for receiving an external excitation signal, carrying out diode protection on the external excitation signal and then transmitting the external excitation signal to the positive and negative driving circuits;
and the positive and negative driving circuit is used for adjusting the positive driving electronic tube flat level output voltage and the negative driving end output voltage according to the direct current high voltage and the external excitation signal.
Furthermore, the high-voltage source circuit comprises a diode D6, capacitors C6, C9, C11, C12, C14, an inductor L1 and a transformer T1, wherein a pin 1 of the switching power supply is connected with a pin 2 of the transformer T1 through the inductor L1, a pin 1 of the switching power supply is also connected with a pin 5 of the transformer T1 through the diode D6 and the capacitor C9, the capacitor C9 is connected with the capacitors C11, C12 and C14 in parallel, one end of the capacitor C9, which is far away from the diode D6, is connected with one end of a capacitor C6, and the other end of the capacitor C6 is grounded.
Further, the high-voltage power supply circuit further comprises a voltage regulator tube ZD1, a diode D7, a resistor R8, a resistor R16, a triode Q2 and a Q3; one end of the resistor R8 is connected with one end of a inductor L1, the other end of the resistor R8 is connected with the cathode of a voltage regulator tube ZD1, the anode of the voltage regulator tube ZD1 is connected with the 5 pin of a transformer T1, the cathode of the diode D7 is connected with the 5 pin of a transformer T1, the anode of the diode D7 is grounded through a resistor R16, the base of the triode Q2 is connected with the 6 pin of the transformer T1, the collector of the triode Q2 is connected with the 2 pin of the transformer T1, the emitter of the triode Q2 is connected with the emitter of the triode Q3, the base of the triode Q3 is connected with the 4 pin of the transformer T1, and the collector of the triode Q3 is connected with the 3 pin of the transformer T1.
Furthermore, the positive and negative driving circuit comprises a high-voltage input/output port, a voltage regulator VR1, a voltage regulator VR2, an electronic tube U1 and a capacitor C1-C4, wherein one end of an input power supply is connected with a pin 3 of a voltage regulator VR1, the other end of the input power supply is connected with a pin 2 of a voltage regulator VR1, two ends of the capacitor C1 are respectively connected with pins 2 and 3 of the voltage regulator VR1, and two ends of the capacitor C3 are respectively connected with pins 1 and 2 of the voltage regulator VR 1; the output of the high-voltage power supply circuit is connected with a pin 1 of a voltage regulator VR2, two ends of the capacitor C2 are respectively connected with pins 1 and 2 of a voltage regulator VR2, and two ends of the capacitor C4 are respectively connected with two ends 1 and 3 of the voltage regulator VR 2; one end of the input power supply is connected with a pin 2 of an electron tube, and a pin 7 of the electron tube is simultaneously connected with a pin 2 of a voltage regulator tube VR1 and a pin 1 of a voltage regulator tube VR 2.
Furthermore, the positive and negative driving circuit further comprises a triode Q6-Q8, a resistor R4, a resistor R6 and a capacitor C5, wherein an emitter of the triode Q8 is connected with the 3 pins of the voltage regulator tube VR2 through a resistor R6, a collector of the triode Q8 is connected with an emitter of the triode Q6, a base of the triode Q8 is connected with a base of the triode Q7, a collector of the triode Q7 is connected with a base of the triode Q6, an emitter of the triode Q7 is connected with the 3 pins of the voltage regulator tube VR2 through a resistor R4, and two ends of the capacitor C5 are respectively connected with the base and the collector of the triode Q6.
Further, the external excitation circuit comprises a connector JP5, resistors R62, R65, R67, diodes D29-D31 and D33, a pin 1 of the connector JP5 is connected with a cathode of a diode D31 through a resistor R65, an anode of a diode D31 is grounded, a pin 3 of the connector JP5 is connected with a cathode of a diode D33 through a resistor R67, an anode of the diode D33 is grounded, a terminal of the resistor R65 far away from the connector JP5 is connected with one end of a resistor R62, the other end of the resistor R62 is grounded through a diode D30 and a resistor R68, and the diode D29 is connected in parallel with the diode D30.
Further, the high-voltage driving circuit for the piezoceramic material further comprises an internal excitation circuit, the internal excitation circuit further comprises an analog-to-digital conversion chip U13, a voltage reference chip U18, an operational amplifier U10A, a resistor R135, a capacitor C57 and a capacitor C58, a REF pin of the analog-to-digital conversion chip U13 is connected with a1 pin of the voltage reference chip U18 through the resistor R135, 1 and 3 pins of the voltage reference chip U18 are grounded through the capacitors C57 and C58 respectively, a VOUT _ A pin of the analog-to-digital conversion chip U13 is connected with a 3 pin of the operational amplifier U10A, and the 1 pin of the operational amplifier U10A provides an excitation source.
Further, the high-voltage driving circuit for the piezoceramic material further comprises a power supply circuit, the power supply circuit comprises a power supply module U1, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a D2, a D3, a capacitor L1 and a capacitor L2, pins 8 and 7 of a power supply module U1 are connected with two ends of the capacitor C1, pins 6 and 5 of the power supply module U1 are connected with two ends of the capacitor C2, pins 5 and 4 of the power supply module U1 are connected with two ends of the capacitor C3, the capacitor C1 is connected with the diode D1 in parallel, the capacitor C2 is connected with the diode D2 in parallel, and the capacitor C3 is connected with the diode D3 in parallel.
Further, the high-voltage driving circuit for the piezoceramic material further comprises an external feedback circuit, the external feedback circuit comprises an operational amplifier U9A, U9B, C20, C22, R63, R69, R73 and R76, a negative input end and an input end of the operational amplifier U9A are respectively connected with two ends of a capacitor C20, and a negative input end and an output end of the operational amplifier U9B are respectively connected with two ends of a capacitor C22; one end of the resistor R69 is connected with the negative input end of the operational amplifier U9A, the other end of the resistor R69 is connected with one end of the resistor R63, and the other end of the resistor R63 is connected with the output end of the operational amplifier U9A; one end of the resistor R76 is connected with the negative input end of the operational amplifier U9B, the other end of the resistor R76 is connected with one end of the resistor R73, and the other end of the resistor R73 is connected with the output end of the operational amplifier U9B.
Further, the high voltage driving circuit for piezoceramic material further comprises an interface circuit, the interface circuit comprises an analog mixed signal chip U22 and a digital signal isolation module U23, and pins 14, 13, 12 and 11 of the analog mixed signal chip U22 are respectively connected with pins 11, 10, 12 and 9 of the digital signal isolation module U23.
Compared with the prior art, the invention has the beneficial effects that: filtering the switching power supply through the high-voltage source circuit, performing self-excited inversion on the filtered current, and outputting direct-current high voltage; receiving an external excitation signal through the external excitation circuit, carrying out diode protection on the external excitation signal, and then transmitting the external excitation signal to the positive and negative driving circuits; adjusting the level output voltage of the positive drive electronic tube and the output voltage of the negative drive end through the positive and negative drive circuits according to the direct-current high voltage and the external excitation signal; the response speed of the high-voltage driving circuit is improved.
Drawings
FIG. 1 is a block diagram of an embodiment of a high voltage driving circuit for piezoceramic materials according to the present invention;
FIG. 2 is a schematic circuit diagram of a high voltage power supply circuit according to the present invention;
FIG. 3 is a schematic circuit diagram of the positive and negative driving circuits provided by the present invention;
FIG. 4 is a schematic circuit diagram of an external excitation circuit provided by the present invention;
FIG. 5 is a schematic circuit diagram of an internal excitation circuit provided by the present invention;
FIG. 6 is a schematic circuit diagram of a power circuit provided by the present invention;
FIG. 7 is a schematic circuit diagram of a voltage step-down circuit according to the present invention;
FIG. 8 is a circuit schematic of an external feedback circuit provided by the present invention;
FIG. 9 is a circuit schematic of an interface circuit provided by the present invention;
FIG. 10 is a circuit schematic of a parameter selection circuit provided by the present invention;
fig. 11 is a schematic circuit diagram of a lamp driving circuit provided in the present invention;
FIG. 12 is a circuit schematic of an internal feedback voltage/current circuit provided by the present invention;
FIG. 13 is a schematic circuit diagram of a USB interface circuit according to the present invention;
FIG. 14 is a circuit schematic of an Ethernet interface circuit provided by the present invention;
FIG. 15 is a schematic circuit diagram of a recording interface circuit according to the present invention.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
The invention provides a high-voltage driving circuit for a piezoceramic material, wherein the structural block diagram of one embodiment is shown in fig. 1, in the embodiment, the high-voltage driving circuit for the piezoceramic material comprises a high-voltage source circuit 1, a positive and negative driving circuit 2 and an external excitation circuit 3, the high-voltage source circuit 1 is electrically connected with the positive and negative driving circuit 2, and the positive and negative driving circuit 2 is electrically connected with the external excitation circuit 3;
the high-voltage source circuit 1 is used for filtering the switching power supply, performing self-excited inversion on the filtered current and outputting direct-current high voltage;
the external excitation circuit 3 is used for receiving an external excitation signal, carrying out diode protection on the external excitation signal and then transmitting the external excitation signal to the positive and negative driving circuits;
and the positive and negative driving circuit 2 is used for adjusting the level output voltage of the positive driving electronic tube and the output voltage of the negative driving end according to the direct-current high voltage and the external excitation signal.
As a preferred embodiment, the high voltage source circuit includes a diode D6, capacitors C6, C9, C11, C12, C14, an inductor L1, and a transformer T1, a pin 1 of the switching power supply is connected to a pin 2 of the transformer T1 through the inductor L1, a pin 1 of the switching power supply is further connected to a pin 5 of the transformer T1 through the diode D6 and the capacitor C9, the capacitor C9 is connected in parallel with the capacitors C11, C12, and C14, one end of the capacitor C9 far away from the diode D6 is connected to an end of a capacitor C6, and the other end of the capacitor C6 is grounded.
In a specific embodiment, as shown in fig. 2, after a 24V switching power supply is turned on, the power supply is filtered and input to a pin 2 at a center tap of a self-excited transformer T1, and then high-frequency and high-voltage are output from ends WP1, WP2 and WP3 after self-excited inversion, ends WPI, WP2 and WP3 are connected to an external transformation box, and direct-current high voltage is output to a regulation input end of a positive/negative driving circuit through voltage-doubling rectification and filtering of C1 to C10 and D1 to D10 in the transformation box, wherein T1 and T2 are self-excited transformers.
As a preferred embodiment, the high voltage source circuit further includes a voltage regulator ZD1, a diode D7, a resistor R8, a resistor R16, a transistor Q2, and a transistor Q3; one end of the resistor R8 is connected with one end of a inductor L1, the other end of the resistor R8 is connected with the cathode of a voltage regulator tube ZD1, the anode of the voltage regulator tube ZD1 is connected with the 5 pin of a transformer T1, the cathode of the diode D7 is connected with the 5 pin of a transformer T1, the anode of the diode D7 is grounded through a resistor R16, the base of the triode Q2 is connected with the 6 pin of the transformer T1, the collector of the triode Q2 is connected with the 2 pin of the transformer T1, the emitter of the triode Q2 is connected with the emitter of the triode Q3, the base of the triode Q3 is connected with the 4 pin of the transformer T1, and the collector of the triode Q3 is connected with the 3 pin of the transformer T1.
As a preferred embodiment, the positive and negative driving circuit includes a high voltage input/output port, a voltage regulator VR1, a voltage regulator VR2, a tube U1, and capacitors C1-C4, one end of an input power supply is connected to 3 pins of a voltage regulator VR1, the other end of the input power supply is connected to 2 pins of the voltage regulator VR1, two ends of the capacitor C1 are respectively connected to 2 and 3 pins of the voltage regulator VR1, and two ends of the capacitor C3 are respectively connected to 1 and 2 pins of the voltage regulator VR 1; the output of the high-voltage power supply circuit is connected with a pin 1 of a voltage regulator VR2, two ends of the capacitor C2 are respectively connected with pins 1 and 2 of a voltage regulator VR2, and two ends of the capacitor C4 are respectively connected with two ends 1 and 3 of the voltage regulator VR 2; one end of the input power supply is connected with a pin 2 of an electron tube, and a pin 7 of the electron tube is simultaneously connected with a pin 2 of a voltage regulator tube VR1 and a pin 1 of a voltage regulator tube VR 2.
In an embodiment, as shown in fig. 3, the CP1 terminal of the driving circuit is a power socket, which inputs 6.3V ac voltage, rectifies the ac voltage, converts the rectified ac voltage into ± 5V through VR1 and VR2, and provides operating voltage for the positive/negative driving circuit. The direct current high voltage output by the high-voltage source circuit is divided into positive electrode high voltage and negative electrode high voltage which are respectively connected into the positive/negative driving circuit. The positive direct-current high voltage is connected to the CP2 end of the positive drive circuit, the negative direct-current high voltage is connected to the tube flat (tube 5 foot) of the negative drive circuit, the main control circuit can output sampling feedback to the CP3 input end of the drive circuit, and the triodes Q1, Q2, Q3, Q6, Q7 and Q8 drive currents are controlled through the strength of feedback signals, so that the voltage output by the positive drive tube flat and the output voltage at the negative drive CP2 end are adjusted. In fig. 3, VR1 and VR2 are both LDO linear regulators, and the chip model is MC78L05 ACP.
As a preferred embodiment, the positive and negative driving circuit further includes a transistor Q6-Q8, resistors R4, R6 and a capacitor C5, an emitter of the transistor Q8 is connected to the 3 pins of the regulator tube VR2 through a resistor R6, a collector of the transistor Q8 is connected to an emitter of the transistor Q6, a base of the transistor Q8 is connected to the base of the transistor Q7, a collector of the transistor Q7 is connected to the base of the transistor Q6, an emitter of the transistor Q7 is connected to the 3 pins of the regulator tube VR2 through a resistor R4, and two ends of the capacitor C5 are respectively connected to the base and the collector of the transistor Q6.
As a preferred embodiment, the external excitation circuit comprises a connector JP5, resistors R62, R65, R67, diodes D29-D31 and D33, wherein a pin 1 of the connector JP5 is connected with a cathode of a diode D31 through a resistor R65, an anode of the diode D31 is grounded, a pin 3 of the connector JP5 is connected with a cathode of a diode D33 through a resistor R67, an anode of the diode D33 is grounded, one end of the resistor R65 far away from the connector JP5 is connected with one end of the resistor R62, the other end of the resistor R62 is connected with the ground through a diode D30 and a resistor R68, and the diode D29 is connected with the diode D30 in parallel.
In a specific embodiment, a schematic circuit diagram of an external excitation circuit is shown in fig. 4, wherein an excitation signal input from an external signal source is input from JP5, and is sent to a driving circuit after being protected by a diode, so as to realize high-voltage output.
As a preferred embodiment, the high voltage driving circuit for piezoceramic material further includes an internal excitation circuit, the internal excitation circuit further includes an analog-to-digital conversion chip U13, a voltage reference chip U18, an operational amplifier U10A, a resistor R135, a capacitor C57 and a capacitor C58, the REF pin of the analog-to-digital conversion chip U13 is connected to the 1 pin of the voltage reference chip U18 through the resistor R135, the 1 and 3 pins of the voltage reference chip U18 are respectively connected to the ground through the capacitors C57 and C58, the VOUT _ a pin of the analog-to-digital conversion chip U13 is connected to the 3 pin of the operational amplifier U10A, and the 1 pin of the operational amplifier U10A provides an excitation source.
In a specific embodiment, as shown in fig. 5, the MCU of the internal excitation circuit communicates with the U13 through SPI communication, the U13 uses an external reference source U18 to ensure more accurate output, the U13 outputs an excitation signal according to set parameters and then amplifies the excitation signal by the U10 to provide an excitation source for a power supply, the U13 chip is AD5686RBRUZ, and the U18 chip is AD1582BRTZ-REEL 7.
As a preferred embodiment, the high voltage driving circuit for piezoceramic material further comprises a power supply circuit, the power supply circuit comprises a power supply module U1, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a diode D2, a capacitor D3, a capacitor L1, and a capacitor L2, pins 8 and 7 of the power supply module U1 are connected with two ends of the capacitor C1, pins 6 and 5 of the power supply module U1 are connected with two ends of the capacitor C2, pins 5 and 4 of the power supply module U1 are connected with two ends of the capacitor C3, the capacitor C1 is connected with the diode D1 in parallel, the capacitor C2 is connected with the diode D2 in parallel, and the capacitor C3 is connected with the diode D3 in parallel.
In a specific embodiment, a circuit schematic diagram of a power supply circuit is shown in fig. 6, the high-voltage driving circuit for the piezoceramic material further comprises a voltage-reducing circuit, and as shown in fig. 7, the main control circuit is powered by a power frequency grid, and is divided into three paths for output after being converted into direct current by an LHE10-20C0515-02 type AC/DC chip, wherein the three paths are respectively 5V, -15V and +15V voltage; the 5V voltage outputs 3.3V after passing through an AMS1117-3 chip and a 3V chip to supply power to the singlechip, the 5V voltage also outputs a 5V isolation power supply after passing through an H0505S-2WR2 isolation chip, the +15V voltage also outputs a +15V isolation power supply after passing through an F1515XT-2WR2 isolation chip, and the isolation 5V voltage outputs a 3.3V isolation power supply after passing through an AMS1117-3.3V chip.
As a preferred embodiment, the high voltage driving circuit for piezoceramic materials further comprises an external feedback circuit, the external feedback circuit comprises operational amplifiers U9A, U9B, C20, C22, R63, R69, R73 and R76, a negative input end and an input end of the operational amplifier U9A are respectively connected with two ends of a capacitor C20, and a negative input end and an output end of the operational amplifier U9B are respectively connected with two ends of a capacitor C22; one end of the resistor R69 is connected with the negative input end of the operational amplifier U9A, the other end of the resistor R69 is connected with one end of the resistor R63, and the other end of the resistor R63 is connected with the output end of the operational amplifier U9A; one end of the resistor R76 is connected with the negative input end of the operational amplifier U9B, the other end of the resistor R76 is connected with one end of the resistor R73, and the other end of the resistor R73 is connected with the output end of the operational amplifier U9B.
In a specific embodiment, as shown in fig. 8, a circuit schematic diagram of the external feedback circuit, a driving signal input from an external signal source is input from JP5, and is sent to a driving circuit after being protected by a diode, so as to realize high-voltage output.
As a preferred embodiment, the high voltage driving circuit for piezoceramic material further comprises an interface circuit, the interface circuit comprises an analog mixed signal chip U22 and a digital signal isolation module U23, and pins 14, 13, 12 and 11 of the analog mixed signal chip U22 are respectively connected with pins 11, 10, 12 and 9 of the digital signal isolation module U23.
In a specific embodiment, as shown in fig. 9, in the schematic circuit diagram of the interface circuit, the serial port J1 receives an external command signal, performs U22 isolation after level conversion by the U23 to communicate with the MCU, and sets the instrument parameters and functions according to the external command, where the U23 chip is MAC3232ESE +, and the U22 chip is ISO7242 CDW.
In a specific embodiment, the high voltage driving circuit for piezoceramic material further includes a parameter selection circuit, a tube driving circuit, an internal feedback voltage/current circuit, an external feedback voltage/current circuit, a USB interface circuit, an ethernet interface circuit, and a programming interface circuit, and the schematic diagrams of the parameter selection circuit, the tube driving circuit, the internal feedback voltage/current circuit, the USB interface circuit, the ethernet interface circuit, and the programming interface circuit are respectively shown in fig. 10 to 15.
For the parameter selection circuit, a relay K4 selects and uses source current or load current, a relay K3 selects and uses voltage or current source, a relay K2 selects and excites voltage and uses external power supply or internal power supply, a relay K1 selects a measuring range, a single chip pin controls a circuit of a relay switch, a chip ULN2803AFWG model is used for increasing a driving chip, and a signal named TUBE _ CTL is output after the signal is amplified. For the valve driving circuit, after the parameter selection is good, the finally output signal TUBE _ CTL becomes the input signal of the valve driving circuit. The higher the positive voltage is, the more through-current of the anode light-emitting diode is, and the through-current of the cathode light-emitting diode is not; the more the negative voltage is absolute, the more the negative light emitting diode is through-flowing, the more the positive light emitting diode is not through-flowing, and the signal can be automatically returned to the positive/negative signal to be output through the port JP 3. The positive and negative signals of the JP3 port are separately connected to the CP3 port in the positive/negative driving circuit and output as a sampling feedback signal.
For an internal feedback voltage/current circuit, sampling voltage VO _ SIGN and sampling current IO _ SIGN are converted into corresponding voltage values or current values within the range of 0-2.5V in proportion after being amplified, the voltage values or the current values are input into an AD7192BRUZ model AD conversion module, and the module is sent to a single chip microcomputer through SPI communication digital signals. For an external feedback voltage/current circuit, the sampling voltage VO _ SIGN and the sampling current IO _ SIGN are respectively output to the test ends SMA1 and SMA2 after operation and amplification. For the USB interface circuit, an external command from J2 is communicated with the MCU through the isolation U25, and instrument parameters and functions are set according to the external command. For the Ethernet interface circuit, the interface J3 receives an external command, communicates with the MCU after level conversion U28, and sets the parameters and functions of the instrument according to the external command.
In a specific embodiment, 220V alternating-current voltage is input at the end of the control circuit JP1, and is converted by U1AC/DC, U15 and U17 DC/DC to supply power to the MCU, and when the MCU is used as an amplifier, voltage values corresponding to polarity and range are output according to an external input excitation signal and an input range/enable control command at the end of JP 5; when the MCU is used as a power supply, the MCU receives an external command through the serial port J1 end and sets the voltage output range and polarity according to the command function.
The invention discloses a high-voltage driving circuit for a piezoelectric ceramic material, which is characterized in that a switching power supply is filtered through a high-voltage source circuit, the filtered current is subjected to self-excited inversion, and direct-current high voltage is output; receiving an external excitation signal through the external excitation circuit, carrying out diode protection on the external excitation signal, and then transmitting the external excitation signal to the positive and negative driving circuits; adjusting the level output voltage of the positive drive electronic tube and the output voltage of the negative drive end through the positive and negative drive circuits according to the direct-current high voltage and the external excitation signal; the response speed of the high-voltage driving circuit is improved.
In the technical scheme of the invention, a high-voltage direct current power supply is supplied by a switching power supply, is realized by adopting a self-excited inversion principle after passing through a filter circuit, and then is output to a positive/negative driving regulating circuit; either the internal (master) or external will send the excitation signal to the positive/negative drive regulation circuit to regulate the final output voltage value. The main control circuit has an external communication function, the function selection and the range selection of the instrument as an amplifier/power supply are realized through an external command, an excitation signal of-10V to +10V is given outside, the amplifier function of the instrument with the output voltage of-10 KV to +10KV and the current of 0-1 mA can be realized, and the range can be set to +/-1 kV or +/-10 kV through the outside; the high-voltage power supply function that the output voltage of the instrument is-10 KV- +10KV and the current is 0-1 mA can be realized by giving an excitation signal of-10V- +10V inside, the measuring range can be set to +/-1 kV or +/-10 kV through the inside, and the driving performance of the high-voltage driving circuit is improved. In the technical scheme of the invention, a high-frequency high-voltage transformer is the core of a high-voltage power supply, and plays roles in energy transfer and boosting in a circuit, and a main circuit adopts a self-excited inversion topological structure; the AC input voltage is transmitted into the main circuit after AC/DC conversion, the self-excited inversion is combined with the quasi-resonant circuit technology, and the zero-voltage LCC resonant inversion technology is adopted, so that the voltage is zero when the switch is opened or disconnected, and the energy consumption is greatly reduced. The main circuit adopts a self-excited inversion topological structure, utilizes self-excited oscillation of a transformer and combines a quasi-resonant circuit technology to carry out electric energy transmission; the main control circuit adopts the dual-function design of internal excitation and external excitation, and realizes the dual purposes of the instrument as an amplifier and a high-voltage source.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A high-voltage driving circuit for a piezoelectric ceramic material is characterized by comprising a high-voltage source circuit, a positive and negative driving circuit and an external excitation circuit, wherein the high-voltage source circuit is electrically connected with the positive and negative driving circuit;
the high-voltage source circuit is used for filtering the switching power supply, performing self-excited inversion on the filtered current and outputting direct-current high voltage;
the external excitation circuit is used for receiving an external excitation signal, carrying out diode protection on the external excitation signal and then transmitting the external excitation signal to the positive and negative driving circuits;
and the positive and negative driving circuit is used for adjusting the positive driving electronic tube flat level output voltage and the negative driving end output voltage according to the direct current high voltage and the external excitation signal.
2. The high voltage driving circuit for the piezoceramic material as claimed in claim 1, wherein the high voltage source circuit comprises a diode D6, a capacitor C6, a capacitor C9, a capacitor C11, a capacitor C12, a capacitor C14, an inductor L1 and a transformer T1, wherein pin 1 of the switching power supply is connected with pin 2 of the transformer T1 through the inductor L1, pin 1 of the switching power supply is further connected with pin 5 of the transformer T1 through a diode D6 and a capacitor C9, the capacitor C9 is connected in parallel with capacitors C11, C12 and C14, one end of the capacitor C9 far away from the diode D6 is connected with one end of a capacitor C6, and the other end of the capacitor C6 is grounded.
3. The high voltage driving circuit for the piezoceramic material according to claim 2, wherein the high voltage source circuit further comprises a voltage regulator ZD1, a diode D7, a resistor R8, a resistor R16, a transistor Q2 and a transistor Q3; one end of the resistor R8 is connected with one end of a inductor L1, the other end of the resistor R8 is connected with the cathode of a voltage regulator tube ZD1, the anode of the voltage regulator tube ZD1 is connected with the 5 pin of a transformer T1, the cathode of the diode D7 is connected with the 5 pin of a transformer T1, the anode of the diode D7 is grounded through a resistor R16, the base of the triode Q2 is connected with the 6 pin of the transformer T1, the collector of the triode Q2 is connected with the 2 pin of the transformer T1, the emitter of the triode Q2 is connected with the emitter of the triode Q3, the base of the triode Q3 is connected with the 4 pin of the transformer T1, and the collector of the triode Q3 is connected with the 3 pin of the transformer T1.
4. The high-voltage driving circuit for the piezoceramic material as claimed in claim 1, wherein the positive and negative driving circuit comprises a high-voltage input/output port, a voltage regulator VR1, a voltage regulator VR2, a tube U1 and capacitors C1-C4, one end of an input power supply is connected with pin 3 of a voltage regulator VR1, the other end of the input power supply is connected with pin 2 of the voltage regulator VR1, two ends of the capacitor C1 are respectively connected with pin 2 and pin 3 of the voltage regulator VR1, and two ends of the capacitor C3 are respectively connected with pin 1 and pin 2 of the voltage regulator VR 1; the output of the high-voltage power supply circuit is connected with a pin 1 of a voltage regulator VR2, two ends of the capacitor C2 are respectively connected with pins 1 and 2 of a voltage regulator VR2, and two ends of the capacitor C4 are respectively connected with two ends 1 and 3 of the voltage regulator VR 2; one end of the input power supply is connected with a pin 2 of an electron tube, and a pin 7 of the electron tube is simultaneously connected with a pin 2 of a voltage regulator tube VR1 and a pin 1 of a voltage regulator tube VR 2.
5. The high voltage driving circuit for piezoceramic material as claimed in claim 4, wherein said positive and negative driving circuit further comprises a transistor Q6-Q8, resistors R4, R6 and a capacitor C5, wherein an emitter of said transistor Q8 is connected to pin 3 of said regulator VR2 through a resistor R6, a collector of said transistor Q8 is connected to an emitter of said transistor Q6, a base of said transistor Q8 is connected to a base of said transistor Q7, a collector of said transistor Q7 is connected to a base of said transistor Q6, an emitter of said transistor Q7 is connected to pin 3 of said regulator VR2 through a resistor R4, and two ends of said capacitor C5 are connected to a base and a collector of said transistor Q6, respectively.
6. The high voltage driving circuit for piezoceramic material according to claim 1, wherein the external excitation circuit comprises a connector JP5, resistors R62, R65, R67 and diodes D29-D31 and D33, pin 1 of the connector JP5 is connected to the cathode of the diode D31 through resistor R65, the anode of the diode D31 is grounded, pin 3 of the connector JP5 is connected to the cathode of the diode D33 through resistor R67, the anode of the diode D33 is grounded, the resistor R65 is connected to one end of a resistor R62 far from the connector JP5, the other end of the resistor R62 is connected to the ground through diode D30 and resistor R68, and the diode D29 is connected to the diode D30 in parallel.
7. The high voltage driving circuit for piezoceramic material as claimed in claim 1, further comprising an internal excitation circuit, wherein the internal excitation circuit further comprises an analog-to-digital conversion chip U13, a voltage reference chip U18, an operational amplifier U10A, a resistor R135, a capacitor C57 and a capacitor C58, the REF pin of the analog-to-digital conversion chip U13 is connected to the 1 pin of the voltage reference chip U18 through the resistor R135, the 1 and 3 pins of the voltage reference chip U18 are connected to the ground through the capacitors C57 and C58 respectively, the VOUT _ A pin of the analog-to-digital conversion chip U13 is connected to the 3 pin of the operational amplifier U10A, and the 1 pin of the operational amplifier U10A provides an excitation source.
8. The high voltage driving circuit for piezoceramic material according to claim 1, further comprising a power circuit, wherein the power circuit comprises a power module U1, a capacitor C1, a capacitor C2, a capacitor C3, a diode D1, a D2, a D3, a capacitor L1, and a capacitor L2, pins 8 and 7 of the power module U1 are connected with two ends of the capacitor C1, pins 6 and 5 of the power module U1 are connected with two ends of the capacitor C2, pins 5 and 4 of the power module U1 are connected with two ends of the capacitor C3, the capacitor C1 is connected with the diode D1 in parallel, the capacitor C2 is connected with the diode D2 in parallel, and the capacitor C3 is connected with the diode D3 in parallel.
9. The high voltage driving circuit for piezoceramic material according to claim 1, further comprising an external feedback circuit, wherein the external feedback circuit comprises operational amplifiers U9A, U9B, C20, C22, R63, R69, R73 and R76, a negative input end and an input end of the operational amplifier U9A are respectively connected with two ends of a capacitor C20, and a negative input end and an output end of the operational amplifier U9B are respectively connected with two ends of a capacitor C22; one end of the resistor R69 is connected with the negative input end of the operational amplifier U9A, the other end of the resistor R69 is connected with one end of the resistor R63, and the other end of the resistor R63 is connected with the output end of the operational amplifier U9A; one end of the resistor R76 is connected with the negative input end of the operational amplifier U9B, the other end of the resistor R76 is connected with one end of the resistor R73, and the other end of the resistor R73 is connected with the output end of the operational amplifier U9B.
10. The high voltage driving circuit for piezoceramic material according to claim 1, further comprising an interface circuit, wherein the interface circuit comprises an analog mixed signal chip U22 and a digital signal isolation module U23, and pins 14, 13, 12 and 11 of the analog mixed signal chip U22 are respectively connected with pins 11, 10, 12 and 9 of the digital signal isolation module U23.
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