CN1564450B - Bipolar Piezoelectric Ceramic Driving Power Supply with Waveform Generating Function - Google Patents

Abstract

The invention discloses a power supply device for driving bipolar piezoelectric ceramics—a bipolar piezoelectric ceramic driving power supply with a waveform generating function. It consists of single chip microcomputer (1), variable voltage output circuit (2), waveform generation circuit (4), variable current output circuit (5), waveform processing and signal buffer circuit (6), counter (7), analog switch ( 8) and a boost output circuit (9), the output terminal of (1) is connected to the controlled terminal of (2), the waveform selection port (C) of (4), the controlled terminal of (5), and the controlled terminal of (8) The controlled end, the two output terminals of (2) are respectively connected to the duty ratio adjustment port (B) of (4) and the frequency adjustment port (A) of (4), and the current input port (E) of (4) is connected to ( 5), the waveform output port (D) of (4) is connected to the input terminal of (6), the two output terminals of (6) are respectively connected to the two input terminals of (8), and the output terminal of (8) is connected to The input end of (9), the other output end of (6) is connected to the input end of (7), and the output end of (7) is connected to the input end of (1). (4) in the present invention can generate various waveforms, and can realize frequency modulation, amplitude modulation and duty ratio adjustment.

Description

Bipolar Piezoelectric Ceramic Driving Power Supply with Waveform Generating Function

Technical field:

The invention relates to a power supply device for driving bipolar piezoelectric ceramics.

Background technique:

There are not many types of existing piezoceramic drive power supplies, and in essence, most of them are accurate high-voltage drive amplifiers for capacitive loads. Since the drive power supply itself does not have the function of generating waveforms, users must be equipped with additional signal sources (such as signal generators, etc.) during use, which leads to many inconveniences such as complicated wiring for users, high cost, and difficulty in real-time adjustment. If software programming is used to digitally generate waveforms such as triangle waves and sine waves, it is difficult to obtain high-precision waveforms due to the function of the program itself and the hardware limitations reserved by the computer, and the frequency is also limited. In addition, from the perspective of users, a considerable number of users use piezoelectric ceramic drive power supplies for various tests. On the premise that the drive accuracy can be guaranteed, they are more concerned about the convenience of adjustment, and even the ability to achieve different drive signals. timing switching. The existing piezoelectric ceramic drive power supply is difficult to realize the above functions, so it is greatly restricted in popularization.

Invention content:

The purpose of the present invention is to provide a bipolar piezoelectric ceramic drive power supply with convenient adjustment, flexible control and analog waveforms. The present invention is realized by the following scheme: a bipolar piezoelectric ceramic drive power supply with waveform generation function, which consists of a single-chip microcomputer (1) model MSP430, a variable voltage output circuit (2), and a waveform generation circuit (4) , variable current output circuit (5), waveform processing and signal buffer circuit (6), counter (7), analog switch (8) and boost output circuit (9), the model is one part of MSP430 microcontroller (1) The No. output terminal (I) is connected to the controlled terminal of the variable voltage output circuit (2), and the No. three output terminal (III) of the microcontroller (1) of MSP430 is connected to the waveform selection port (C) of the waveform generating circuit (4). The No. 4 output terminal (IV) of the single-chip microcomputer (1) whose model is MSP430 is connected to the controlled terminal of the variable current output circuit (5), and the No. 5 output terminal (V) of the single-chip microcomputer (1) of the MSP430 model is connected with an analog switch The controlled end of (8), the two output terminals of the variable voltage output circuit (2) are respectively connected to the duty cycle adjustment port (B) of the waveform generation circuit (4) and the frequency adjustment port (B) of the waveform generation circuit (4) A), the current input port (E) of the waveform generating circuit (4) is connected to the output end of the variable current output circuit (5), and the waveform output port (D) of the waveform generating circuit (4) is connected to the waveform processing and signal buffering circuit ( 6), the two output ends of the waveform processing and signal buffer circuit (6) are respectively connected to the two input ends of the analog switch (8), and the output end of the analog switch (8) is connected to the boost output circuit (9) Input end, the third output end of waveform processing and signal buffer circuit (6) connects the input end of counter (7), and the output end connection model of counter (7) is the input end of the single-chip microcomputer (1) of MSP430;

Waveform generating circuit (4) is made up of the chip (U5) that model is MAX038, capacitor No. 1, capacitor (C2) and resistance (R1) No. 2, and the model is the 3rd pin (3) of chip (U5) of MAX038 ) and the fourth pin (4) are respectively connected to the two output terminals of the single-chip microcomputer (1) of the model MSP430, and the output waveform of the chip (U5) of the model MAX038 is selected by the control signal output by the single-chip microcomputer (1) of the model MSP430 , the first pin (1) of the MAX038 chip (U5) is connected to one end of the capacitor (C1), one end of the resistor (R1) and the positive pole of the power supply (+VA), and the other end of the capacitor (C1) is connected to A No. 2 capacitor (C2) is connected between the fifth pin (5) and the eleventh pin (11) of the chip (U5) of the model MAX038, the seventh pin (7), The twentieth pin (20) of the chip (U5) whose model is MAX038 is connected to the negative pole of the power supply (-VA);

The variable current output circuit determines that the model is the reference frequency of the output waveform of the chip (U5) of MAX038;

The variable voltage output circuit transmits the output waveform frequency fine-tuning signal and the adjustment signal of the output waveform duty cycle to the chip (U5) whose model is MAX038;

The waveform processing and signal buffering circuit receives the waveform signal whose output amplitude is plus or minus 1V from the chip (U5) whose model is MAX038, controls the amplitude of this waveform signal, and outputs two sets of signals with opposite waveform phases;

The counter completes the counting of the number of pulses of a group of output waveforms of the waveform processing and signal buffer circuit (6);

The analog switch completes waveform processing and the selection of two groups of signals with opposite waveform phases output by the signal buffer circuit (6);

The boost output circuit completes the amplification of the waveform signal output by the analog switch (8) to drive the piezoelectric ceramic.

Waveform generation circuit 4 in the present invention has adopted the chip MAX038 that produces wave form, through the correct use of this chip, and in conjunction with precision operational amplifier LM324 and digital potentiometer MAX5455, can produce various wave forms, and can realize frequency modulation, amplitude modulation and adjustment duty cycle. The signal generation chip MAX038 can generate analog triangle waves, square waves, sine waves, etc., and the frequency is adjustable from 0.1Hz to 20MHz. These analog signals fundamentally overcome the resolution problem that is difficult to solve through digital synthesis, and improve the pressure resistance The precision of electroceramic control. The selection of all waveforms is regulated by digital instructions through the MSP430 single-chip microcomputer, so the user can easily adjust the driving power of the present invention through the peripheral computer. The waveform signals sent out are all counted by the counter 7 and sent to the single-chip microcomputer 1 of the model MSP430 for control. The number and time of output waveforms can be controlled without adding any equipment, which greatly reduces the general driving power. Inconvenience. The invention has the advantages of reasonable design, reliable operation and large promotion value.

Description of drawings:

FIG. 1 is a schematic structural view of the present invention, FIG. 2 is a schematic structural view of Embodiment 1 of the present invention, and FIG. 3 is a schematic structural view of Embodiment 2 of the present invention.

Detailed ways:

Specific Embodiment 1: The present embodiment will be specifically described below with reference to FIG. 1 . This embodiment is composed of a single-chip microcomputer 1, a variable voltage output circuit 2, a waveform generation circuit 4, a variable current output circuit 5, a waveform processing and signal buffer circuit 6, a counter 7, an analog switch 8 and a boost output circuit 9. The single-chip microcomputer 1 The output terminal I of the single-chip microcomputer 1 is connected to the controlled terminal of the variable voltage output circuit 2, the output terminal III of the single-chip microcomputer 1 is connected to the waveform selection port C of the waveform generating circuit 4, and the output terminal IV of the single-chip microcomputer 1 is connected to the controlled terminal of the variable current output circuit 5 , the output terminal V of the single-chip microcomputer 1 is connected to the controlled terminal of the analog switch 8, and the two output terminals of the variable voltage output circuit 2 are respectively connected to the duty ratio adjustment port B of the waveform generation circuit 4 and the frequency adjustment port A of the waveform generation circuit 4 , the current input port E of the waveform generation circuit 4 is connected to the output end of the variable current output circuit 5, the waveform output port D of the waveform generation circuit 4 is connected to the input end of the waveform processing and signal buffer circuit 6, and the waveform processing and signal buffer circuit 6 The two output terminals are respectively connected to the two input terminals of the analog switch 8, the output terminal of the analog switch 8 is connected to the input terminal of the boost output circuit 9, and the other output terminal of the waveform processing and signal buffer circuit 6 is connected to the input terminal of the counter 7, The output terminal of the counter 7 is connected to the input terminal of the single-chip microcomputer 1 .

Specific Embodiment 2: The present embodiment will be specifically described below with reference to FIG. 2 . Waveform generation circuit 4 is composed of chip U5, capacitor C1, capacitor C2 and resistor R1. Pin 3 and pin 4 of chip U5 are respectively connected to the two output terminals of single-chip microcomputer 1, and the output waveform of chip U5 is selected by the control signal output by single-chip microcomputer 1. , pin 1 of chip U5 is connected to one end of capacitor C1, one end of resistor R1 and power supply +VA, the other end of capacitor C1 is connected to pin 7 of chip U5, capacitor C2 is connected in series between pin 5 and pin 11 of chip U5, chip U5 Pin 20 is connected to the power supply -VA. The model used for chip U5 is MAX038, and the model used for MCU 1 is MSP430. The variable current output circuit 5 is composed of a digital potentiometer U2, and pin 1, pin 2, pin 3, pin 12, pin 13 and pin 14 of the digital potentiometer U2 are respectively connected to the output end of the single-chip microcomputer 1 to obtain chip selection, interrupt And voltage regulation signal, pin 4 and pin 10 of digital potentiometer U2 are connected to power supply +VA, pin 8 of digital potentiometer U2 is connected to power supply -VA, pin 5 of digital potentiometer U2 is connected to the other end of resistor R1, digital potentiometer U2 The pin 7 of the chip U5 is connected to the pin 10 of the chip U5 to transmit a signal to the chip U5 so as to determine the reference frequency of the output waveform of the chip U5. The model of digital potentiometer U2 is MAX5455, because it is a digital potentiometer, it is easy to adjust. The variable voltage output circuit 2 is composed of a digital potentiometer U1. Pin 1, pin 2, pin 3, pin 12, pin 13 and pin 14 of the digital potentiometer U1 are respectively connected to the output terminal of the single chip microcomputer 1 to obtain chip selection, interrupt And the voltage regulation signal, the pin 6 of the digital potentiometer U1 is connected to the pin 8 of the chip U5 to transmit the output waveform frequency fine-tuning signal to the chip U5, and the pin 9 of the digital potentiometer U1 is connected to the pin 7 of the chip U5 to transmit the output to the chip U5 The adjustment signal for the duty cycle of the waveform. The digital potentiometer U1 is a MAX5455. The waveform generation circuit 4 can output frequency output from tens to tens of kilohertz, and can have a fine adjustment of plus or minus 70% after the reference frequency is determined, and the adjustment resolution can reach 5/1000 (by digital potential depends on the accuracy of the device). Waveform processing and signal buffering circuit 6 consists of five integrated operational amplifiers (U6A, U6B, U6C, U6D, and U9), ten resistors (R2, R3, R4, R5, R6, R8, R9, R27, R28, and R30), Composed of potentiometer R29, potentiometer R31 and digital potentiometer U3, the non-inverting input terminal of the integrated operational amplifier U6A is connected to pin 19 of the chip U5 to receive the waveform signal output by the chip U5, and the output terminal of the integrated operational amplifier U6A is connected to its inverting input end and one end of resistor R27, the other end of resistor R27 is connected to the inverting input end of integrated operational amplifier U6B, one end of resistor R28 and one end of potentiometer R29, the non-inverting input end of integrated operational amplifier U6B is grounded through resistor R3, integrated operational amplifier The output end of U6B is connected to the other end of the potentiometer R29 and its sliding end and the non-inverting input end of the integrated operational amplifier U9, the inverting input end of the integrated operational amplifier U9 is connected to the output end of the integrated operational amplifier U9, and the other end of the resistor R28 is connected to the potential The sliding end of the potentiometer R31, one fixed end of the potentiometer R31 is grounded, the other fixed end of the potentiometer R31 is connected to the power supply +VA through the resistor R30, the pin 6 of the digital potentiometer U3 is connected to the output end of the integrated operational amplifier U9, and the digital potentiometer Pin 4 of U3 is connected to power supply +VA, pin 7, pin 8 and pin 11 of digital potentiometer U3 are grounded, and pin 1, pin 2, pin 3, pin 12, pin 13 and pin 14 of digital potentiometer U3 are respectively connected to the microcontroller 1 to obtain chip selection, interrupt and voltage regulation signals. The model of digital potentiometer U3 is MAX5455. Pin 5 of digital potentiometer U3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to one end of resistor R6 and The inverting input terminal of the integrated operational amplifier U6C, the non-inverting input terminal of the integrated operational amplifier U6C is connected to one end of the resistor R4, the other end of the resistor R4 is grounded, the output terminal of the integrated operational amplifier U6C is connected to the other end of the resistor R6 and one end of the resistor R8, The other end of the resistor R8 is connected to the inverting input terminal of the integrated operational amplifier U6D and one end of the resistor R9, the non-inverting input terminal of the integrated operational amplifier U6D is grounded through the resistor R2, and the other end of the resistor R9 is connected to the output terminal of the integrated operational amplifier U6D. The above five integrated operational amplifiers all use the LM324 model. The waveform processing and signal buffering circuit 6 receives the output amplitude of the chip U5 as a plus or minus 1V waveform signal, adjusts it to a single-quadrant output through the integrated operational amplifier U6B, and realizes the control of the signal amplitude through the digital potentiometer U3, and then the waveform The signals output two sets of signals with opposite waveform phases at the output terminals of the integrated operational amplifier U6C and the integrated operational amplifier U6D respectively. The analog switch 8 uses a MAX4533 chip, and its input terminals are respectively connected to the output terminals of the integrated operational amplifier U6C and the integrated operational amplifier U6D to complete the selection of the positive and negative two groups of signals. The input terminal of the counter 7 is connected to the output terminal of the integrated operational amplifier U6C or the integrated operational amplifier U6D to complete the counting of the pulse number of the output waveform. The boost output circuit 9 completes the amplification of the waveform signal to drive the piezoelectric ceramic. It can be realized by selecting PA140 integrated operational amplifier produced by American Apex Company.

Specific Embodiment Three: The present embodiment will be specifically described below in conjunction with FIG. 3 . The difference between this embodiment and Embodiment 1 is that the analog switch 8 is composed of multiple analog switches 8-1, 8-2, 8-3 and 8-4, and the output terminal M of the waveform processing and signal buffer circuit 6 The input terminals M1, M2, M3 and M4 of the analog switch 8 are respectively connected, the output terminal N of the waveform processing and signal buffer circuit 6 is respectively connected with the input terminals N1, N2, N3 and N4 of the analog switch 8, and the output terminal O1 of the analog switch 8 . output. With this arrangement, four channels of waveform output can be obtained through the control of the single-chip microcomputer 1, and each channel contains two sets of positive and negative phase waveform signals. Therefore, the driving power supply of the present invention can simultaneously drive multiple groups of bipolar piezoelectric ceramics.

Claims (2)

1. bipolar drive power supply for piezoelectric ceramics with waveform generation function, it is characterized in that it is the single-chip microcomputer (1) of MSP430 by model, variable voltage output circuit (2), Waveform generating circuit (4), variable current output circuit (5), waveform processing and signal damping circuit (6), counter (7), analog switch (8) and the output circuit that boosts (9) are formed, model is the controlled end that an output (I) of the single-chip microcomputer (1) of MSP430 connects variable voltage output circuit (2), model is the waveform selection port (C) that No. three outputs (III) of the single-chip microcomputer (1) of MSP430 connect Waveform generating circuit (4), model is the controlled end that No. four outputs (IV) of the single-chip microcomputer (1) of MSP430 connect variable current output circuit (5), model is the controlled end that No. five outputs (V) of the single-chip microcomputer (1) of MSP430 connect analog switch (8), two outputs of variable voltage output circuit (2) connect the duty ratio adjustment port (B) of Waveform generating circuit (4) respectively and the frequency of Waveform generating circuit (4) is adjusted port (A), the current input terminal mouth (E) of Waveform generating circuit (4) connects the output of variable current output circuit (5), the waveform output port (D) of Waveform generating circuit (4) connects the input of waveform processing and signal damping circuit (6), two outputs of waveform processing and signal damping circuit (6) are connected two inputs of analog switch (8) respectively, the output of analog switch (8) connects the input of output circuit (9) of boosting, the input of the 3rd the output linkage counter (7) of waveform processing and signal damping circuit (6), it is the input of the single-chip microcomputer (1) of MSP430 that the output of counter (7) connects model;

Waveform generating circuit (4) is the chip (U5) of MAX038 by model, an electric capacity (C1), No. two electric capacity (C2) and resistance (R1) are formed, model is No. three outputs (III) that tripod (3) and the 4th pin (4) of the chip (U5) of MAX038 is connected the single-chip microcomputer that model is MSP430 (1) respectively, by model is that to select model be the output waveform of the chip (U5) of MAX038 for the control signal of single-chip microcomputer (1) output of MSP430, model is the end that first pin (1) of the chip (U5) of MAX038 connects an electric capacity (C1), one end of resistance (R1) and positive source (+VA), it is the 7th pin (7) of the chip (U5) of MAX038 that the other end of an electric capacity (C1) connects model, model is to be connected with No. two electric capacity (C2) between the 5th pin (5) of chip (U5) of MAX038 and the 11 pin (11), and model is that the 20 pin (20) of the chip (U5) of MAX038 connects power cathode (VA);

The variable current output circuit determines that model is the reference frequency of output waveform of the chip (U5) of MAX038;

The variable voltage output circuit is chip (U5) the transmission output waveform frequency trim signal of MAX038 and the adjustment signal of output waveform duty ratio to model;

It is that the amplitude of output of the chip (U5) of MAX038 is the waveform signal of positive and negative 1V that waveform processing and signal damping circuit receive model, and this waveform signal amplitude is controlled, and exports two groups of signals that waveform phase is opposite;

Counter is finished the counting to the pulse number of one group of output waveform of waveform processing and signal damping circuit (6);

Analog switch is finished the selection of the opposite signal of two groups of waveform phases of waveform processing and signal damping circuit (6) output;

The output circuit that boosts is finished the amplification of the waveform signal of analog switch (8) output, with the drive pressure electroceramics.

2. the bipolar drive power supply for piezoelectric ceramics with waveform generation function according to claim 1, it is characterized in that variable current output circuit (5) is that the digital regulation resistance (U2) of MAX5455 is formed by model, model is first pin (1) of the digital regulation resistance (U2) of MAX5455, crus secunda (2), tripod (3), the 12 pin (12), the tenth tripod (13) and the 14 pin (14) are connected to the output of the single-chip microcomputer that model is MSP430 (1), to obtain the sheet choosing, interrupt and the pressure regulation signal, model be the 4th pin (4) of the digital regulation resistance (U2) of MAX5455 be connected with the tenth pin (10) positive source (+VA), model is that the octal (8) of the digital regulation resistance (U2) of MAX5455 connects power cathode (VA), model is the other end that the 5th pin (5) of the digital regulation resistance (U2) of MAX5455 connects resistance (R1), model be the 7th pin (7) of the digital regulation resistance (U2) of MAX5455 to connect model be the tenth pin (10) of the chip (U5) of MAX038, be the chip (U5) of MAX038 to model thus transmit signal and determine that model is the reference frequency of output waveform of the chip (U5) of MAX038.

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