CN204984835U

CN204984835U - Piezoelectricity pump performance testing device

Info

Publication number: CN204984835U
Application number: CN201520753757.8U
Authority: CN
Inventors: 刘庆财; 李新波; 姜良旭; 石要武; 吴越; 刘国君; 杨志刚
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2016-01-20
Anticipated expiration: 2025-09-28

Abstract

The utility model discloses a piezoelectricity pump performance testing device aims at overcoming nonlinearity and the hysteretic problem of present piezoelectric pump when flow control. It comprises host computer and the next machine, and the next machine comprises with piezoelectric pump voltage signal acquisition circuit power supply circuit, STM32F103RBT6 single chip circuit, LCD display circuit, serial communication circuit, water pressure collecting circuit, the bridge traffic collection circuit of meeting an emergency, the chip U7's of the serial communication circuit of the next machine 5 feet are connected with the USB D+ mouth of the USB mouth of host computer, and chip U7's 6 feet are connected with the USB D - mouth electricity of the USB mouth of host computer. Chip U2's 5 feet are connected with STM32F103RBT6 single chip circuit electricity among the power supply circuit, LCD display circuit, serial communication circuit, water pressure collecting circuit, the bridge traffic collection circuit of meeting an emergency are connected with piezoelectric pump voltage signal acquisition circuit and STM32F103RBT6 single chip circuit electricity.

Description

Piezoelectric pump performance testing device

Technical field

The utility model relates to a kind of performance testing device belonging to piezoelectricity field, and or rather, the utility model relates to a kind of piezoelectric pump performance testing device.

Background technique

Piezoelectric pump is as the core driving source of micrometeor system, play the key effect of transformation of energy, application widely, such as, cool at clinical medicine, chemical analysis and detection, biological sample analysis, integrated chip, microfluid circulates the application space of the multinomial Disciplinary Frontiers such as to carry have piezoelectric pump.Along with continuing deeply and the high speed development of piezoelectric material of piezoelectric pump research, the research and apply of piezoelectric pump also obtains increasing concern, and piezoelectricity pump performance is also improved rapidly.If but wish based on this microminiature piezoelectric pump, realizing more accurate flow control, with regard to needing, more deep research being done to the electrical model of piezoelectric pump.The traditional BVD model of piezoelectric pump is for not enough to some extent some occasion, in order to set up piezoelectric pump electrical model better, we have built a kind of piezoelectric pump performance testing device, realized the foundation of new piezoelectric pump electrical model by the test data of this testing apparatus, thus better utilize piezoelectric pump to realize accurate flow control.

The drived control mode of present most piezoelectric pump is still based on opened loop control, although have scheme and the method for some closed loop controls, if Chinese patent bulletin (cloth) number is CN103557143, open (bulletin) day: 2014.02.05, denomination of invention is closed-loop piezoelectric film pump and flow control method thereof, this patent is the piezoelectric pump closed loop control based on pid control algorithm that University Of Suzhou realizes, because piezoelectric system has very large non-linear and hysteresis characteristic, the control effects causing it real is not special good.Want the drived control realizing piezoelectric pump better, will realize better control by the method setting up its electrical model, present patent application is exactly the piezoelectric pump performance testing device and test method that realize to realize setting up piezoelectric pump electrical model.

Summary of the invention

Technical problem to be solved in the utility model overcomes prior art to there is the non-linear and delayed problem of piezoelectric pump when flow control, provides a kind of piezoelectric pump performance testing device.

For solving the problems of the technologies described above, the utility model adopts following technological scheme to realize: described piezoelectric pump performance testing device is made up of upper-position unit and lower-position unit, adopts USB line to be connected between upper-position unit with lower-position unit.

Described lower-position unit forms primarily of power circuit, STM32F103RBT6 single chip circuit, LCD display circuit, serial communication circuit, water pressure Acquisition Circuit, strain bridge flow collection circuit and piezoelectric pump voltage signal acquisition circuit.

In power circuit, model is that 5 pin of the chip U2 of NCP551 are electrically connected with the resistance R2 of STM32F103RBT6 single chip circuit; LCD display circuit is that PB1, PB0, PC0, PC1, PC2, PC3, PC4, PC5, PC6, PC7 of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected by RS, E, DBO, DB1, DB2, DB3, DB4, DB5, DB6, DB7 pin and the model in STM32F103RBT6 single chip circuit; Model in strain bridge flow collection circuit is that the analog acquisition pin ADC2 pin that 7 pins and the model in STM32F103RBT6 single chip circuit of the chip of OP07 is the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; 1 pin of LM324-A in two path water pressure acquisition circuit in water pressure Acquisition Circuit, 7 pins of LM324-A and the model in STM32F103RBT6 single chip circuit are that ADC0, ADC1 pin of the analog acquisition pin of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; Lower end and the model in STM32F103RBT6 single chip circuit of the resistance R36 in piezoelectric pump voltage signal acquisition circuit are that the ADC3 pin of the analog amount pin of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; The RXD pin that model in serial communication circuit is 2 pins of the chip U7 of CH340 and TXD pin is the single-chip microcomputer U3 of STM32F103RBT6 with the model in STM32F103RBT6 single chip circuit is electrically connected, and the TXD pin that the model in serial communication circuit is 3 pin of the chip U7 of CH340 and RXD pin is the single-chip microcomputer U3 of STM32F103RBT6 with the model in STM32F103RBT6 single chip circuit is electrically connected.

Upper-position unit described in technological scheme with adopt USB line to be connected between lower-position unit to refer to: the model of the serial communication circuit in lower-position unit is the USBD+ that 5 pin of the chip U7 of CH340 meet plug J1 in power circuit, and model is the USBD-that 6 pin of the chip U7 of CH340 meet plug J1 in power circuit.

STM32F103RBT6 single chip circuit described in technological scheme includes single-chip microcomputer U3 that model is STM32F103RBT6, crystal oscillator Y1, crystal oscillator Y2, inductance L 1, mechanical key RESET1, resistance R2, resistance R3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13 and electric capacity C14.No. 2 ends of crystal oscillator Y2 are electrically connected with the upper end of electric capacity C8, No. 1 end of crystal oscillator Y2 is electrically connected with the upper end of electric capacity C9, electric capacity C8 is connected with the lower end of electric capacity C9 and ground connection GND, two ends and the resistance R3 of crystal oscillator Y2 are connected in parallel, right-hand member and the model of resistance R3 are that 6 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, No. 2 ends of crystal oscillator Y1 are electrically connected with the upper end of electric capacity C6, No. 1 end of crystal oscillator Y1 is electrically connected with the upper end of electric capacity C7, and electric capacity C6 is connected with the lower end of electric capacity C7 and ground connection GND; Left end and the model of electric capacity C5 are that 64 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C5 are that 63 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C12 are that 48 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C12 are that 47 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C14 are that 31 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C14 are that 32 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C13 are that 19 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C13 are that 18 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; The upper end of electric capacity C10 and electric capacity C11 and model are that 12 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, the lower end of electric capacity C10 and electric capacity C11 and model are that 13 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, the left end of inductance L 1 connects VCC3.3 end, and right-hand member and the model of inductance L 1 are that 13 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Termination VCC3.3 on resistance R2, lower end is electrically connected with the left end of electric capacity C4, and lower end and the model of resistance R2 are that 7 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and the right-hand member ground connection GND of electric capacity C4, mechanical key RESSET1 is connected in parallel on the two ends of electric capacity C4.

Power circuit described in technological scheme includes mini-usb joint J1, model is NCP551 chip U2, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, safety fuse cutout F1, button S1 and plug JP3.The pin USBD-that the pin D-of mini-usb plug J1 and pin D+ are the chip U7 of CH340 by resistance R4 and the model in resistance R5 and serial communication circuit is successively electrically connected with pin USBD+, resistance R6 lower end connects VCC3.3, the upper end of resistance R6 is electrically connected with the pin D+ of mini-usb joint J1, the pin VCC end of mini-usb plug J1 is connected with the left end of safety fuse cutout F1, the right-hand member of safety fuse cutout F1 is electrically connected with the left end of button S1, right-hand member and the model of button S1 are that 1 pin of the chip U2 of NCP551 is electrically connected, the output terminal VCC3.3 of model to be 5 pin of the chip U2 of NCP551 be power circuit, electric capacity C1 and electric capacity C2 be connected in parallel on that model is the chip U2 of NCP551 between 1 pin and 2 pin, model is that 2 pin of the chip U2 of NCP551 connect GND, model is that 3 pin of the chip U2 of NCP551 are electrically connected with 1 pin, the upper end of electric capacity C3 is electrically connected with output terminal VCC3.3, the lower end of electric capacity C3 is held with GND and is electrically connected, JP3 is six pin power plugs, and its 2 pin, 4 pin, 6 pin connect VCC3.3 end, and 1 pin, 3 pin, 5 pin connect GND end.

LCD display circuit described in technological scheme includes liquid crystal screen U1, the slide rheostat R1 and exclusion R7 that model is LCD1602.Model is that 1 pin of the liquid crystal screen U1 of LCD1602 is connected GND end with 16 pin, and 2 pin are connected VCC5 end with 15 pin, 5 pin and R/W pin connect GND end, and model is that 3 pin of the liquid crystal screen U1 of LCD1602 connect GND end by a slide rheostat R1, 1 pin of exclusion R7 connects VCC5 end, 2 pin direct type number are 14 pin of the liquid crystal screen U1 of LCD1602, 3 pin direct type number are 13 pin of the liquid crystal screen U1 of LCD1602, 4 pin direct type number are 12 pin of the liquid crystal screen U1 of LCD1602, 5 pin direct type number are 11 pin of the liquid crystal screen U1 of LCD1602, 6 pin direct type number are 10 pin of the liquid crystal screen U1 of LCD1602, 7 pin direct type number are 9 pin of the liquid crystal screen U1 of LCD1602, 8 pin direct type number are 8 pin of the liquid crystal screen U1 of LCD1602, 9 pin direct type number are 7 pin of the liquid crystal screen U1 of LCD1602, 10 pin direct type number are 6 pin of the liquid crystal screen U1 of LCD1602, 11 pin direct type number are 4 pin of the liquid crystal screen U1 of LCD1602, model is 7 pin to the 14 pin difference direct type number of the liquid crystal screen U1 of LCD1602 is that the PC0 pin of the single-chip microcomputer U3 of STM32F103RBT6 is to PC7 pin, 4 pin direct type number are the PB1 pin of the single-chip microcomputer U3 of STM32F103RBT6, and 6 pin direct type number are the PB0 pin of the single-chip microcomputer U3 of STM32F103RBT6.

Strain bridge flow collection circuit described in technological scheme includes resistance R17, resistance R18, resistance R19, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R38, resistance R39, resistance R40, resistance R41, slide potentiometer P3, slide potentiometer P5, electric capacity C15, electric capacity C16, electric capacity C23, electric capacity C24, electric capacity C25, electric capacity C26, electric capacity C27, electric capacity C28, electric capacity C29, diode D5, diode D6, diode D7, model is the chip of AD620 and model is the chip of OP07.

The left end of resistance R38 and resistance R40 and+12V hold and are electrically connected, and resistance R38 is electrically connected with the left end of resistance R41 with resistance R39 successively with the right-hand member of resistance R40, the right-hand member ground connection GND of precision resistance R39 and resistance R41, the right-hand member of precision resistance R38 and resistance R40 connects the upper end of electric capacity C26 and electric capacity C25 successively, and electric capacity C25 is connected ground GND with the lower end of electric capacity C26, the simultaneously lower end of the right-hand member of resistance R38 and resistance R40 connecting resistance R23 and resistance R22 successively, the left end of the upper termination slip variable resistance P3 of resistance R22 and resistance R23 and right-hand member, the lower end of the centre tap connecting resistance R18 of P3, the upper end of resistance R18 and+12V end are electrically connected with the left end of resistance R17, the upper end of the right termination capacitor C16 of resistance R17,6 pin that the upper end that the lower end that the lower end of electric capacity C16 connects electric capacity C15 together connects ground GND, electric capacity C15 again and model are the chip of AD620 are electrically connected, the upper end of resistance R19 is held with-12V and is electrically connected, the lower end of resistance R19 and the upper end of electric capacity C23 are electrically connected with the negative pole end of electric capacity C24, the lower end of electric capacity C23 and the positive terminal of C24 together ground connection GND, 4 pin that the upper end of electric capacity C23 and the negative pole end of electric capacity C24 and model are the chip of AD620 are electrically connected, resistance R38, the right-hand member of resistance R40 and resistance R26, the upper end electrical connection of resistance R29, and the negative pole of the lower terminating diode D7 at precision resistance R26, the positive pole of the lower terminating diode D7 of resistance R29, and the positive pole of the lower terminating diode D6 at resistance R26, the negative pole of the lower terminating diode D6 of resistance R29, resistance R26, the lower end of resistance R29 and model are 2 pin and the electrical connection of 3 pin of the chip of AD620, model is the left end of 1 pin connecting resistance R25 of the chip of AD620, the right-hand member of resistance R25 connects the left end of slide potentiometer P5, 5 pin that right-hand member and its centre tap and the model of slide potentiometer P5 are the chip of AD620 are electrically connected, model is 7 pin contact resistance R28 of the chip of AD620, the upper end of the right-hand member connecting resistance R24 of resistance R28, and the lower terminating number of resistance R24 is 7 pin of the chip of OP07, model is that 4 pin of the chip of OP07 meet-12V, and 6 pin meet+12V, the right-hand member of 2 pin connecting resistance R28, the right-hand member of 3 pin connecting resistance R27, the left end ground connection GND of resistance R27, the upper end just terminating at precision resistance R24 of diode, negative terminal is connected on 7 pin that model is the chip of OP07.

Water pressure Acquisition Circuit described in technological scheme includes pressure transducer U5 that model is MPX5700DP, model is MPX5700DP pressure transducer U6, resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, electric capacity C30, electric capacity C31, electric capacity C32, electric capacity C33, electric capacity C34, electric capacity C35, diode D8, diode D9, model are the general-purpose operation amplifier U4 of LM324-A.

Described water pressure Acquisition Circuit comprises upper and lower two path water pressure acquisition circuit, and the structure of upper and lower two path water pressure acquisition circuit and acquisition principle just the same, the water pressure Acquisition Circuit on a upper road chooses the pressure transducer U5 that model is MPX5700DP, and the water pressure Acquisition Circuit on next road chooses the pressure transducer U6 that model is MPX5700DP, model is that 3 pin of the pressure transducer U5 of MPX5700DP are held with VCC5 and are electrically connected, 2 pin meet GND, 1 pin is electrically connected with the left end of resistance R30, the right-hand member of resistance R30 is electrically connected with the upper end of resistance R32, the upper end of electric capacity C31 is electrically connected with the right-hand member of resistance R30, diode D8 upper end is electrically connected with the right-hand member of resistance R30, the upper end of electric capacity C30 is electrically connected with the right-hand member of resistance R30, the left end of resistance R31 is electrically connected with the right-hand member of resistance R30, the right-hand member of resistance R31 is electrically connected with the upper end of electric capacity C32, electric capacity C32, electric capacity C31, resistance R32, the positive terminal of diode D8 and the lower end of electric capacity C30 link together and ground connection GND, right-hand member and the model of resistance R31 are that 3 pin of the general-purpose operation amplifier U4 of LM324-A are electrically connected, model is that 1 pin of the general-purpose operation amplifier U4 of LM324-A is electrically connected with 2 pin, 6 pin are electrically connected with 7 pin, model is that 4 pin of the general-purpose operation amplifier U4 of LM324-A connect VCC5 end, and model is that 11 pin of the general-purpose operation amplifier U4 of LM324-A and electric capacity C35, electric capacity C33, the positive terminal of diode D9, resistance R35 are electrically connected also ground connection GND with the lower end of electric capacity C34, left end and the model of resistance R33 are that 1 pin of the pressure transducer U6 of MPX5700DP is electrically connected, the positive terminal of the right-hand member of resistance R33 and electric capacity C34, resistance R35, diode D9 is electrically connected with the upper end of electric capacity C33, the right-hand member of resistance R33 is electrically connected with resistance R34 left end, and resistance R34 right-hand member and model are that 5 pin of the general-purpose operation amplifier U4 of LM324-A are electrically connected.

Piezoelectric pump voltage signal acquisition circuit described in technological scheme includes diode rectifier bridge D10, resistance R36 and the resistance R37 that 220V turns the step-down transformer T1 of 110V, model is KBJ2510.220V turns the industrial-frequency alternating current of the primary air termination 220V of the step-down transformer T1 of 110V, one end of secondary winding is electrically connected with the upper end of diode rectifier bridge D10, the other end of secondary winding is electrically connected with the lower end of diode rectifier bridge D10, the left end of diode rectifier bridge D10 is electrically connected with the upper end of resistance R36, the lower end of resistance R36 is electrically connected with the upper end of resistance R37, and the lower end of resistance R37 is electrically connected rear also ground connection GND with the right-hand member of diode rectifier bridge D10; The lower end of resistance R36 is the output terminal that the ADC3 pin of the single-chip microcomputer U3 being STM32F103RBT6 is connected with model.

Serial communication circuit described in technological scheme includes chip U7 that model is CH340, crystal oscillator Y3, electric capacity C36, electric capacity C37, electric capacity C38, electric capacity C39 and electric capacity C40.Model is that 4 pin of the chip U7 of CH340 are electrically connected with the right-hand member of electric capacity C38, the left end ground connection GND of electric capacity C38, the upper end electrical connection of crystal oscillator Y3 left end and electric capacity C39, and is electrically connected with 7 pin that model is the chip U7 of CH340; The upper end electrical connection of crystal oscillator Y3 right-hand member and electric capacity C40, and 8 pin being the chip U7 of CH340 with model are electrically connected, the lower end ground connection GND of electric capacity C39 and electric capacity C40, model is that 16 pin of the chip U7 of CH340 are held with VCC5 and are electrically connected, the left end of electric capacity C36 and electric capacity C37 is held with meeting VCC5, the right-hand member ground connection GND of electric capacity C36 and electric capacity C37; Model is the 1 pin ground connection GND of the chip U7 of CH340.

Compared with prior art the beneficial effects of the utility model are:

1. piezoelectric pump performance testing device described in the utility model is the piezoelectric pump Testing Platform of the single-chip microcomputer of STM32F103RBT6 based on model, model is that the single-chip microcomputer of STM32F103RBT6 has outstanding power consumption control and abundant peripheral hardware resource, the most important thing is the plurality of advantages such as its cost performance is high, this piezoelectric pump Testing Platform is applicable to carrying out business promotion.

2. piezoelectric pump performance testing device described in the utility model adopts lower-position unit platform to gather, and carry out communicating and man-machine response with host computer platform, and realize integral collecting and measure, greatly reduce the participation content of people's craft, automaticity is high.

3. piezoelectric pump performance testing device described in the utility model is while guarantee test platform excellent performance, equally also notes the process of power consumption aspect, achieves the low power consumption process of piezoelectric pump Testing Platform, economical environment-protective.

4. piezoelectric pump performance testing device described in the utility model adopts structurized top-down blocking design, each unit realizes respective function, cooperatively interact between unit and realize the function of whole piezoelectric pump Testing Platform, reduce the electromagnetic interference in unit circuit simultaneously.

5. the circuit that the control section of piezoelectric pump performance testing device described in the utility model achieves low voltage, low current controls high voltage, high electric current, makes operator safer like this, better the personal property of protection.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is the structural principle block diagram of piezoelectric pump performance testing device described in the utility model;

Fig. 2 is the application structure exemplary plot of piezoelectric pump performance testing device described in the utility model;

Fig. 3 is the schematic diagram of the STM32F103RBT6 single chip circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 4 is the structure principle chart of the power circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 5 is the schematic diagram of the LCD display circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 6 is the schematic diagram of the strain bridge flow collection circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 7 is the structure principle chart of the two path water pressure acquisition circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 8 is the structure principle chart of the rectifier bridge voltage collection circuit that piezoelectric pump performance testing device described in the utility model adopts;

Fig. 9 is the schematic diagram of the serial communication circuit that piezoelectric pump performance testing device described in the utility model adopts;

Figure 10 is the lower-position unit workflow diagram that piezoelectric pump performance testing device described in the utility model adopts;

Embodiment

Below in conjunction with accompanying drawing, the utility model is explained in detail:

With USB line, upper-position unit is connected with lower-position unit, open the software in upper-position unit, turn on the power switch, select the baud rate of upper-position unit and com port and open the measurement button of upper-position unit, lower-position unit gathers 4 kinds of data of the input output relevant to piezoelectric pump characteristic within certain cycle, to be presented in real time after carrying out filtering on LCD and to send to upper-position unit application program by serial ports, the collection realizing automation is measured, the data that lower-position unit receives by upper-position unit are saved in computer with the form of txt file, to carry out checking and processing of data later, set up for next step electrical model of carrying out piezoelectric pump and lay the first stone.

The utility model object sets up electrical model for piezoelectric pump to provide a kind of piezoelectric pump performance testing device, or rather, piezoelectric pump performance testing device is gather these 4 kinds of inputoutput datas of voltage signal on the front and back stages overpressure relevant to piezoelectric pump characteristic, piezoelectric pump output flow, piezoelectric pump to set up a kind of test platform of the electrical model of piezoelectric pump.

Wherein, the voltage signal on piezoelectric pump is testing apparatus input, an input of electrical model that more definite is; Dynamic pressure before prime overpressure reflected pump is another input of electrical model; Dynamic pressure after rear class overpressure reflected pump is an output of electrical model; Again because the open and close state of piezoelectric pump is realized by the change of valve block pressure at two ends difference in pump, therefore front stage overpressure common dynamic reflection piezoelectric pump valve block frequency of okperation, the outflow capacity of valve block and the driving force to institute's pump fluid; Piezoelectric pump output flow is another output of electrical model.

Consult Fig. 1, piezoelectric pump performance testing device described in the utility model is made up of upper-position unit and lower-position unit two-part.Model is that the single chip circuit of STM32F103RBT6 and peripheral circuit thereof are as lower-position unit, lower-position unit is primarily of power circuit, the single chip circuit of STM32F103RBT6, LCD display circuit, serial communication circuit, water pressure Acquisition Circuit, strain bridge flow collection circuit, piezoelectric pump voltage signal acquisition circuit forms.

The utility model achieves the collection of piezoelectric pump input output front and back stages inner pipe water pressure power, the collection of piezoelectric pump output flow is achieved by the mode of weighing, the collection of piezoelectric pump voltage signal that has been the AD functional realiey of the single-chip microcomputer of STM32F103RBT6 by model, achieved the man-machine interaction of upper-position unit and lower-position unit by serial ports, upper-position unit achieves real-time display 4 kinds of collected amounts and 4 kinds of collected data in a period of time can be kept in computer with the form of txt file.

Consult Fig. 2, the circuit application exemplary construction of piezoelectric pump performance testing device described in the utility model is made up of two water tumblers, piezoelectric pump, sine-wave generator and upper-position units and lower-position unit.For piezoelectric pump provides operating voltage after sine-wave generator work, realized the switch degree of piezoelectric pump by the size of control voltage, thus control the water velocity in the current direction right-hand member water tumbler in left end water tumbler.Lower-position unit is by gathering the voltage signal on piezoelectric pump front and back stages overpressure, piezoelectric pump output flow, piezoelectric pump, and the data collected are passed on upper-position unit by serial ports, carry out process and the preservation of data, finally realize the foundation of the test platform of the electrical model of piezoelectric pump.

Consult Fig. 3, the STM32F103RBT6 single chip circuit that piezoelectric pump performance testing device described in the utility model adopts includes single-chip microcomputer U3 that model is STM32F103RBT6, crystal oscillator Y1, crystal oscillator Y2, inductance L 1, mechanical key RESET1, resistance R2, resistance R3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14.

Model is the single-chip microcomputer U3 of STM32F103RBT6 is a microcontroller based on ARMv7 framework that ST company produces.The passive crystal oscillator of crystal oscillator Y2 to be frequency be 8M is the host crystal oscillator of STM32F103RBT6 minimum system, for generation of system clock.The upper end of the 22P/35V ceramic disc capacitor C8 that the left end (No. 2 ends) of crystal oscillator Y2 connects, right-hand member (No. 1 end) connects the upper end of 22P/35V ceramic disc capacitor C9, the lower end of electric capacity C8 and electric capacity C9 links together and receives GND, and electric capacity C8 and electric capacity C9 plays a part starting of oscillation in parallel and feedback.The two ends of crystal oscillator Y2 resistance in parallel is the resistance R3 of 1M simultaneously, the i.e. left end of left end (No. 2 ends) the contact resistance R3 of crystal oscillator Y2, the right-hand member of right-hand member (No. 1 end) the contact resistance R3 of crystal oscillator Y2, resistance R3 plays a part starting of oscillation in parallel here, and the right-hand member direct type number of resistance R3 is 6 pin of the single-chip microcomputer U3 of STM32F103RBT6.The passive crystal oscillator of crystal oscillator Y1 to be frequency be 32.768K, be STM32F103RBT6 single-chip microcomputer from crystal oscillator.The left end (No. 2 ends) of crystal oscillator Y1 connects the upper end of 22P/35V ceramic disc capacitor C6, the right-hand member (No. 1 end) of crystal oscillator Y1 connects the upper end of 22P/35V ceramic disc capacitor C7, the lower end of electric capacity C6 and electric capacity C7 links together and receives GND, electric capacity C6 and electric capacity C7 plays a part starting of oscillation in parallel and feedback, and the RTC for system provides the reference frequency of real-time clock.

The ceramic disc capacitor C5 left end direct type number of 0.1UF/35V is 64 pin of the single-chip microcomputer U3 of STM32F103RBT6, and right-hand member direct type number is 63 pin of the single-chip microcomputer U3 of STM32F103RBT6.The ceramic disc capacitor C12 left end direct type number of 0.1UF/35V is 48 pin of the single-chip microcomputer U3 of STM32F103RBT6, and right-hand member direct type number is 47 pin of the single-chip microcomputer U3 of STM32F103RBT6.The ceramic disc capacitor C14 left end direct type number of 0.1UF/35V is 31 pin of the single-chip microcomputer U3 of STM32F103RBT6, and right-hand member direct type number is 32 pin of the single-chip microcomputer U3 of STM32F103RBT6.The ceramic disc capacitor C13 left end direct type number of 0.1UF/35V is 19 pin of the single-chip microcomputer U3 of STM32F103RBT6, and right-hand member direct type number is 18 pin of the single-chip microcomputer U3 of STM32F103RBT6.The power filtering capacitor of ceramic disc capacitor C5, electric capacity C12, electric capacity C14, electric capacity C13 to be model the be single-chip microcomputer digital I/O port of STM32F103RBT6, for the High-frequency Interference of elimination digital I/O port.The ceramic disc capacitor C10 of 0.1UF/35V, the upper terminating of ceramic disc capacitor C11 number are 12 pin of the single-chip microcomputer U3 of STM32F103RBT6, and lower terminating number is 13 pin of the single-chip microcomputer U3 of STM32F103RBT6.4.7UF I-shaped inductance L 1 left end connects VCC3.3 end, and right-hand member direct type number be 13 pin of the single-chip microcomputer U3 of STM32F103RBT6, and electric capacity C10, electric capacity C11 and inductance L 1 form the eliminator of STM32 inside AD collecting unit thus realize the High frequency filter of analog channel.

Resistance be 1k metal film resister R2 on termination VCC3.3, the left end of the ceramic disc capacitor C4 of lower termination 0.1UF/35V, and resistance is terminate to 7 pin that model is the single-chip microcomputer U3 of STM32F103RBT6 under the metal film resister R2 of 1k, the right-hand member of the ceramic disc capacitor C4 of 0.1UF/35V meets GND, and mechanical key RESSET1 is connected in parallel on the two ends of the ceramic disc capacitor C4 of 0.1UF/35V.Metal film resister R2, ceramic disc capacitor C4 and mechanical key RESSET1 achieve simple resistance-capacitance type reset circuit, for the single-chip microcomputer using external reset to make model be STM32F103RBT6 when accident operationally appears in lower-position unit recovers normally to provide guarantee.

Consult Fig. 4, the power supply of piezoelectric pump performance testing device described in the utility model takes from the USB interface of upper-position unit, power circuit includes mini-usb joint J1, model is NCP551 chip U2, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, safety fuse cutout F1, button S1 and plug JP3.

Mini-usb plug J1 has 5 pins, is pin VCC respectively, pin GND, pin D-, pin D+, pin NC.For system provides one to be no more than 5 volts of voltages of 500 milliamperes between pin VCC and pin GND two lines, pin D-and pin D+ is pin USBD-and the pin USBD+ of the chip U7 of CH340 respectively by the metal film resister resistance R4 of a 22R and the resistance R5 model be connected in (shown in Fig. 9) serial communication circuit, then is that to realize upper-position unit with model be communicating of the single-chip microcomputer of STM32F103RBT6 for the transition of communications of chip U7 of CH340 by model.The upper end that 1.5K metal film resister R6 lower end connects VCC3.3, resistance R6 is electrically connected with the pin D+ of mini-usb joint J1, for realizing usb high-speed communication.VCC5 end is connected with the left end of the resettable fuse F1 of 500 milliamperes, the right-hand member of safety fuse cutout F1 can the left end of oneself locked button S1 be electrically connected with one, right-hand member and the model of button S1 are that 1 pin of the chip U2 of NCP551 is electrically connected, model is the chip U2 of NCP551 is a kind of linear voltage stabilization chip, the voltage transitions of 5 volts to 3.3 volts can be realized thus obtain the output voltage of VCC3.3, the 3.3V output terminal VCC3.3 of model to be 5 pin of the chip U2 of NCP551 be power circuit.Wherein being connected in parallel on 1UF/35V ceramic disc capacitor C1, the electric capacity C2 between 1 pin and 2 pin that model is the chip U2 of NCP551 is filter capacitor, its objective is the High-frequency Interference in elimination power supply signal.Model is that 2 pin of the chip U2 of NCP551 connect GND, and model is that 3 pin of the chip U2 of NCP551 are electrically connected with 1 pin.The upper end of the ceramic disc capacitor C3 of 0.1UF/35V is held with VCC3.3 and is electrically connected, and the lower end of electric capacity C3 is held with GND and is connected, and electric capacity C3 is the decoupling capacitor between VCC3.3 end and GND end.JP3 is six pin power plugs, and its 2 pin, 4 pin, 6 pin connect VCC3.3 end, and 1 pin, 3 pin, 5 pin connect GND end.There is provided 3.3v voltage for outside or provide 3.3v supply voltage for this piezoelectric pump performance testing device.

Consult Fig. 5, LCD display circuit includes liquid crystal screen U1 that model is LCD1602, slide rheostat R1, exclusion R7.

Model is the liquid crystal screen U1 of LCD1602 is industrial character mode lcd, for showing the character such as numeral, letter.Model is that 1 pin of the liquid crystal screen U1 of LCD1602 is connected GND end with 16 pin, 2 pin are connected VCC5 end with 15 pin, 5 pin and R/W pin connect GND end, show that model is that the single-chip microcomputer U3 of STM32F103RBT6 only carries out write operation to the liquid crystal screen U1 that model is LCD1602, it is connect GND end after the slide rheostat R1 of 10k that 3 pin are encapsulated as 1206 resistances by one, here the effect of slide rheostat R1 regulates model to be the liquid crystal screen U1 display brightness of LCD1602, exclusion R7 is encapsulated as the metallic film exclusion that SIP11 resistance is 1K, 1 pin of exclusion R7 connects VCC5 end, 2 pin direct type number are 14 pin of the liquid crystal screen U1 of LCD1602, 3 pin direct type number are 13 pin of the liquid crystal screen U1 of LCD1602, 4 pin direct type number are 12 pin of the liquid crystal screen U1 of LCD1602, 5 pin direct type number are 11 pin of the liquid crystal screen U1 of LCD1602, 6 pin direct type number are 10 pin of the liquid crystal screen U1 of LCD1602, 7 pin direct type number are 9 pin of the liquid crystal screen U1 of LCD1602, 8 pin direct type number are 8 pin of the liquid crystal screen U1 of LCD1602, 9 pin direct type number are 7 pin of the liquid crystal screen U1 of LCD1602, 10 pin direct type number are 6 pin of the liquid crystal screen U1 of LCD1602, 11 pin direct type number are 4 pin of the liquid crystal screen U1 of LCD1602, thus achieve the connection that exclusion R7 and model are the liquid crystal screen U1 of LCD1602.And 7 pin that model is the liquid crystal screen U1 of LCD1602 are the PC0 pin ~ PC7 pin of the single-chip microcomputer U3 of STM32F103RBT6 to 14 pin difference direct type number, 4 pin direct type number are the PB1 pin of the single-chip microcomputer U3 of STM32F103RBT6,6 pin direct type number are the PB0 pin of the single-chip microcomputer U3 of STM32F103RBT6, by such signal wiring, to achieve model be the single-chip microcomputer U3 of STM32F103RBT6 is the read-write capability of the liquid crystal screen U1 of LCD1602 to model, and what exclusion R7 here play a part is corresponding I/O port pull-up.

Consult Fig. 6, the chip that strain bridge flow collection circuit includes resistance R17, resistance R18, resistance R19, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R38, resistance R39, resistance R40, resistance R41, slide potentiometer P3, slide potentiometer P5, electric capacity C15, electric capacity C16, electric capacity C23, electric capacity C24, electric capacity C25, electric capacity C26, electric capacity C27, electric capacity C28, electric capacity C29, diode D5, diode D6, diode D7, model are AD620 and model are the chip of OP07.

The collection of flow is that the mode by weighing realizes, weight and strain are mapped by the resistance-strain bridge of weighing measurement circuit, again strain and voltage are mapped, fainter voltage signal are amplified in an applicable scope, then the AD mouth being sent to single-chip microcomputer gathers.The circuit of specific implementation is:

It is the precision resistance R38 of 1k, the left end of resistance R40 that+12V end connects resistance, it is the precision resistance R39 of 1k, the left end of resistance R41 that the right-hand member of precision resistance R38, resistance R40 connects resistance successively, the right-hand member ground connection GND of precision resistance R39, resistance R41, get precision resistance R38, the right-hand member of resistance R40 does the output of strain bridge, such precision resistance R38, resistance R39, resistance R40, resistance R41 form resistance-strain bridge.The right-hand member of precision resistance R38, resistance R40 connects respectively and is encapsulated as 0603 resistance is the ceramic disc capacitor C26 of 334UF/35V, the upper end of electric capacity C25, and the lower end of ceramic disc capacitor C25, electric capacity C26 connects ground GND.Precision resistance R38 simultaneously, the right-hand member of resistance R40 meets the precision resistance R23 that resistance is 240k respectively, the lower end of resistance R22, resistance is the precision resistance R22 of 240k, the upper termination of resistance R23 is encapsulated as left end and right-hand member that 1206 resistances are the precision slip variable resistance P3 of 10k, the centre tap of P3 connects the lower end that resistance is the precision resistance R18 of 100k, resistance is that the upper termination+12V of the precision resistance R18 of 100k holds and resistance is the left end of the precision resistance R17 of 100, resistance is the upper end that the right-hand member of the precision resistance R17 of 100 connects that capacitance is the ceramic disc capacitor C16 of 0.1UF/35V, it is that then the lower end of the electrochemical capacitor C15 of 22UF/35V together connects ground GND that the lower end of ceramic disc capacitor C16 connects capacitance.Capacitance is that upper (positive pole) end of the electrochemical capacitor C15 of 22UF/35V is connected to 6 pin that model is the chip of AD620.

-12V end connects the upper end that resistance is the precision resistance R19 of 100, resistance is the lower termination capacitance of the precision resistance R19 of 100 is the upper end of the electric capacity C23 of 22UF/35V and the negative pole end of electric capacity C24, the lower end of electric capacity C23 and the positive terminal of C24 links together and then ground connection GND, 4 pin that the upper end of electric capacity C23 and the negative pole end of electric capacity C24 and model are the chip of AD620 are electrically connected.

The right-hand member of precision resistance R38, resistance R40 and resistance are the precision resistance R26 of 100, the upper end electrical connection of resistance R29, and the negative pole of the lower terminating diode D7 at precision resistance R26, the positive pole of the lower terminating diode D7 of precision resistance R29, and at the negative pole of the positive pole of the lower terminating diode D6 of precision resistance R26, the lower terminating diode D6 of precision resistance R29, the lower end of precision resistance R26, resistance R29 and model are 2 pin and the electrical connection of 3 pin of the chip of AD620.Model is the left end that 1 pin of the chip of AD620 connects that resistance is the precision resistance R25 of 100, resistance is the left end that the right-hand member of the precision resistance R25 of 100 connects that resistance is the precision slip variable resistance P5 of 100k, and 5 pin that right-hand member and its centre tap and the model of accurate slip variable resistance P5 are the chip of AD620 are electrically connected.Model is the upper end that the right-hand member of the precision resistance R28 that 7 pin of the chip of AD620 connect that a resistance is 100, precision resistance R28 connects that resistance is the precision resistance R24 of 14K, and the lower terminating number of precision resistance R24 is the ADC2 mouth of the single-chip microcomputer U3 of STM32F103RBT6.Model is that 4 pin of the chip of OP07 meet-12V, and 6 pin meet+12V, and 2 pin connect the right-hand member of precision resistance R28, and 3 pin connect the right-hand member that resistance is the precision resistance R27 of 10K, the left end ground connection GND of precision resistance R27.7 pin direct type number are the ADC2 mouth of the single-chip microcomputer U3 of STM32F103RBT6.The upper end just terminating at precision resistance R24 of diode, negative terminal is connected on 7 pin that model is the chip of OP07.

Consult Fig. 7, realized the collection of piezoelectric pump input output front and back stages inner pipe water pressure power by pressure transducer.Water pressure Acquisition Circuit includes pressure transducer U5 that model is MPX5700DP, model is MPX5700DP pressure transducer U6, resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, electric capacity C30, electric capacity C31, electric capacity C32, electric capacity C33, electric capacity C34, electric capacity C35, diode D8, diode D9, model are the general-purpose operation amplifier U4 of LM324-A.

Described water pressure Acquisition Circuit comprises upper and lower two path water pressure acquisition circuit, and the structure of upper and lower two path water pressure acquisition circuit and acquisition principle just the same, the water pressure Acquisition Circuit on a upper road chooses the pressure transducer U5 that model is MPX5700DP, and the water pressure Acquisition Circuit on next road chooses the pressure transducer U6 that model is MPX5700DP; Model is the pressure transducer U5 of MPX5700DP is a pressure transducer that Freescale company produces, and can realize the conversion of water pressure to voltage, the linearity is higher.Model is that 3 pin of the pressure transducer U5 of MPX5700DP are held with VCC5 and are electrically connected, 2 pin meet GND, 1 pin and resistance are that the left end of the precision resistance R30 of 1k is electrically connected, resistance is that the upper end that right-hand member and the resistance of the precision resistance R30 of 1k is the precision resistance R32 of 1k is electrically connected, and the bleeder circuit that resistance R30 and resistance R32 is formed realizes the conversion of range from 5V to 2.5V.Upper end and the resistance of the ceramic disc capacitor C31 of 22UF/35V are that the right-hand member of the precision resistance R30 of 1k is electrically connected.Precision resistance R30 and ceramic disc capacitor C31 constitutes simple RC eliminator, elimination high-frequency interferencing signal.Voltage stabilizing value is that the right-hand member that diode D8 upper end and the resistance of 2.5V is the precision resistance R30 of 1k is electrically connected; diode D8 is reverse zener diode; mainly consider that the safety of protective system is equipped with; when input signal is higher than 2.5V; owing to there being the existence of diode D8, make follow-up voltage can not more than 2.5V thus the simulation mouth line protecting single-chip microcomputer be not broken down by high-voltage and cause damaging.Upper end and the resistance of the ceramic disc capacitor C30 of 1U/35V are that the right-hand member of the precision resistance R30 of 1k is electrically connected, resistance is that the right-hand member that left end and the resistance of the precision resistance R31 of 200 is the precision resistance R30 of 1k is electrically connected, resistance is that the upper end that right-hand member and the resistance of the precision resistance R31 of 200 is the ceramic disc capacitor C32 of 1U/35V is electrically connected, and the lower end of electric capacity C32 and ceramic disc capacitor C31, precision resistance R32, the positive terminal of diode D8 and the lower end of ceramic disc capacitor C30 link together and ground connection GND.Resistance is that 3 pin that right-hand member and the model of the precision resistance R31 of 200 is the general-purpose operation amplifier U4 of LM324-A are electrically connected; Model is that 1 pin of the general-purpose operation amplifier U4 of LM324-A is electrically connected with 2 pin, and 6 pin are electrically connected with 7 pin, and model is that 4 pin of the general-purpose operation amplifier U4 of LM324-A connect VCC5 end, and model is the 11 pin ground connection GND of the general-purpose operation amplifier U4 of LM324-A.Electric capacity C30, electric capacity C32 and precision resistance R31 together form a pi type filter, realize better elimination high-frequency interferencing signal, be the voltage follower circuit of the general-purpose operation amplifier U4 of LM324-A, realize effect of impedence matching by model.

Model is that 11 pin of the general-purpose operation amplifier U4 of LM324-A and electric capacity C35, electric capacity C33, the positive terminal of diode D9, resistance R35 are electrically connected with the lower end of electric capacity C34; Left end and the model of resistance R33 are that 1 pin of the pressure transducer U6 of MPX5700DP is electrically connected, the positive terminal of the right-hand member of resistance R33 and electric capacity C34, resistance R35, diode D9 is electrically connected with the upper end of electric capacity C33, the right-hand member of resistance R33 is electrically connected with resistance R34 left end, and 5 pin are electrically connected resistance R34 right-hand member with being the general-purpose operation amplifier U4 of LM324-A with model.

Consult Fig. 8, piezoelectric pump voltage signal acquisition circuit includes step-down transformer T1, diode rectifier bridge D10, resistance R36, the resistance R37 that 220V turns 110V.

Model is the maximum backward voltage of the diode rectifier bridge D10 of KBJ2510 is 1000V, and maximum is 25A by electric current.220V turns the industrial-frequency alternating current of the primary air termination 220V of the step-down transformer T1 of 110V, one end of secondary winding is electrically connected with the upper end of diode rectifier bridge D10, the other end of secondary winding is electrically connected with the lower end of diode rectifier bridge D10, left end and the resistance of diode rectifier bridge D10 are that the upper end of the precision resistance R36 of 460k is electrically connected, resistance is that the upper end that lower end and the resistance of the precision resistance R36 of 460k is the precision resistance R37 of 10k is electrically connected, and resistance is after the lower end of the precision resistance R37 of 10k is electrically connected with the right-hand member of diode rectifier bridge D10 and ground connection GND.Model is the lower end that the ADC3 mouth of the single-chip microcomputer U3 of STM32F103RBT6 meets precision resistance R36.For piezoelectric pump provides the dextrorotation ripple driving source that a relative voltage is lower the ac power supply of 220V turns the step-down transformer T1 step-down of 110V by 220V after, dextrorotation ripple after step-down becomes the d. c. voltage signal of pulsation after diode rectifier bridge D10 bridge rectifier, through resistance be the precision resistance R36 of 460k, resistance enters the ADC3 acquisition port that model is the single-chip microcomputer U3 of STM32F103RBT6 after being the precision resistance R37 dividing potential drop of 10k, realizes the collection of drive voltage signal on piezoelectric pump.

Consult Fig. 9, serial communication circuit includes chip U7 that model is CH340, crystal oscillator Y3, electric capacity C36, electric capacity C37, electric capacity C38, electric capacity C39, electric capacity C40.

Model is the chip U7 of CH340 is the chip that serial ports turns USB.Model is the 1 pin ground connection GND of the chip U7 of CH340, model is that the TXD mouth that 2 pin and the model of the chip U7 of CH340 is the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected, model is that the RXD interface that 3 pin and the model of the chip U7 of CH340 is the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected, thus realize the full-duplex communication that chip that model is CH340 and model are the single-chip microcomputer U3 of STM32F103RBT6, model is ground connection GND after 4 pin of the chip U7 of CH340 are electrically connected with the ceramic disc capacitor C38 of 0.1UF/35V, wherein electric capacity C38 plays bypass filtering, model is the USBD+ of the 5 pin map interlinking 4 plug J1 of the chip U7 of CH340, model be the 6 pin map interlinking 4 plug J1 of the chip U7 of CH340 USBD-, thus to achieve model by the chip that model is CH340 be the single-chip microcomputer U3 of STM32F103RBT6 and the communication function of upper-position unit.The crystal oscillator Y3 left end of frequency 12M and be encapsulated as 0603 the upper end electrical connection of ceramic disc capacitor C39 of 22P/35V, and to be electrically connected with 7 pin that model is the chip U7 of CH340.The upper end electrical connection of the crystal oscillator Y3 right-hand member of frequency 12M and the ceramic disc capacitor C40 of 22P/35V, and be electrically connected with 8 pin that model is the chip U7 of CH340.Ceramic disc capacitor C39, C40 and crystal oscillator Y3 form clock signal circuit, for the model chip U7 that is CH340 provides the CLK clock of internal operation.Model is that 16 pin of the chip U7 of CH340 are held with VCC5 and are electrically connected, for the normal work of the model chip U7 that is CH340 provides power supply voltage.The ceramic disc capacitor C36 of 0.1UF/35V, the left end of electric capacity C37 connect VCC5 end, and the right-hand member ground connection GND of electric capacity C36, electric capacity C37, realizes the function of electrical power by-pass filtering.

Consult Figure 10, with USB line, upper-position unit is connected with lower-position unit, lower-position unit obtains electric and startup optimization, the clock of initialization system after powering on, initialization serial ports, the interface that initialization AD gathers, the corresponding I/O port of initialization LCD, initialize Timer, setting timing cycle is 1s, then enter in major cycle, realize the image data that the real-time display of LCD is current.When set time arrives time, namely time 1s arrives, carry out 4 road AD gather and by collection value stored in buffer memory, after times of collection arrives 10 times, carry out the bubbling filtering of buffer memory, then data are issued upper-position unit by serial ports, after being sent, buffer memory and counting variable are reset, thus complete the process once gathering transmission.

In Fig. 4, the voltage conversion chip of power circuit produces the 3.3V reference power supply of lower-position unit, and the single-chip microcomputer U3 being STM32F103RBT6 for model powers.LCD display circuit in Fig. 5 is that PB1, PB0, PC0, PC1, PC2, PC3, PC4, PC5, PC6, PC7 of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected by RS, E, DBO, DB1, DB2, DB3, DB4, DB5, DB6, DB7 pin and the model in Fig. 3, and the single-chip microcomputer U3 utilizing model to be STM32F103RBT6 realizes the Presentation Function of LCD.The ADC2 pin that strain bridge flow collection circuit in Fig. 6 is the analog acquisition pin of the single-chip microcomputer U3 of STM32F103RBT6 by 7 pins of OP07 and the model in Fig. 3 is electrically connected, and the single-chip microcomputer U3 utilizing model to be STM32F103RBT6 realizes the flow collection function of strain bridge.ADC0, ADC1 pin that two path water pressure acquisition circuit in Fig. 7 is the analog acquisition pin of the single-chip microcomputer U3 of STM32F103RBT6 by 1 pin of LM324-A, 7 pins of LM324-A with the model in Fig. 3 is electrically connected, and the single-chip microcomputer U3 utilizing model to be STM32F103RBT6 realizes the collecting function of pressure.In Fig. 8, the Acquisition Circuit of piezoelectric pump voltage is electrically connected by the ADC3 pin that the lower end of its resistance R36 and the model in Fig. 3 are the analog amount pin of the single-chip microcomputer U3 of STM32F103RBT6, and the single-chip microcomputer U3 utilizing model to be STM32F103RBT6 realizes the collecting function of drive end voltage.Serial communication circuit in Fig. 9 is that TXD, RXD pin of the communications pins of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected by TXD, RXD pin and the model in Fig. 3, and the single-chip microcomputer U3 utilizing model to be STM32F103RBT6 realizes the function of upper-position unit communication.

Claims

1. a piezoelectric pump performance testing device, is characterized in that, described piezoelectric pump performance testing device is made up of upper-position unit and lower-position unit, adopts USB line to be connected between upper-position unit with lower-position unit;

Described lower-position unit forms primarily of power circuit, STM32F103RBT6 single chip circuit, LCD display circuit, serial communication circuit, water pressure Acquisition Circuit, strain bridge flow collection circuit and piezoelectric pump voltage collection circuit;

In power circuit, model is that 5 pin of the chip U2 of NCP551 are electrically connected with the resistance R2 of STM32F103RBT6 single chip circuit; LCD display circuit is that PB1, PB0, PC0, PC1, PC2, PC3, PC4, PC5, PC6, PC7 of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected by RS, E, DBO, DB1, DB2, DB3, DB4, DB5, DB6, DB7 pin and the model in STM32F103RBT6 single chip circuit; Model in strain bridge flow collection circuit is that the analog acquisition pin ADC2 pin that 7 pins and the model in STM32F103RBT6 single chip circuit of the chip of OP07 is the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; 1 pin of LM324-A in two path water pressure acquisition circuit in water pressure Acquisition Circuit, 7 pins of LM324-A and the model in STM32F103RBT6 single chip circuit are that ADC0, ADC1 pin of the analog acquisition pin of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; Lower end and the model in STM32F103RBT6 single chip circuit of the resistance R36 in piezoelectric pump voltage collection circuit are that the ADC3 pin of the analog amount pin of the single-chip microcomputer U3 of STM32F103RBT6 is electrically connected; The RXD pin that model in serial communication circuit is 2 pins of the chip U7 of CH340 and TXD pin is the single-chip microcomputer U3 of STM32F103RBT6 with the model in STM32F103RBT6 single chip circuit is electrically connected, and the TXD pin that the model in serial communication circuit is 3 pin of the chip U7 of CH340 and RXD pin is the single-chip microcomputer U3 of STM32F103RBT6 with the model in STM32F103RBT6 single chip circuit is electrically connected.

2., according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described upper-position unit with adopt USB line to be connected between lower-position unit to refer to:

The model of the serial communication circuit in lower-position unit is the USBD+ that 5 pin of the chip U7 of CH340 meet plug J1 in power circuit, and model is the USBD-that 6 pin of the chip U7 of CH340 meet plug J1 in power circuit.

3. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described STM32F103RBT6 single chip circuit includes single-chip microcomputer U3 that model is STM32F103RBT6, crystal oscillator Y1, crystal oscillator Y2, inductance L 1, mechanical key RESET1, resistance R2, resistance R3, electric capacity C4, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C13 and electric capacity C14;

No. 2 ends of crystal oscillator Y2 are electrically connected with the upper end of electric capacity C8, No. 1 end of crystal oscillator Y2 is electrically connected with the upper end of electric capacity C9, electric capacity C8 is connected with the lower end of electric capacity C9 and ground connection GND, two ends and the resistance R3 of crystal oscillator Y2 are connected in parallel, right-hand member and the model of resistance R3 are that 6 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, No. 2 ends of crystal oscillator Y1 are electrically connected with the upper end of electric capacity C6, No. 1 end of crystal oscillator Y1 is electrically connected with the upper end of electric capacity C7, and electric capacity C6 is connected with the lower end of electric capacity C7 and ground connection GND; Left end and the model of electric capacity C5 are that 64 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C5 are that 63 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C12 are that 48 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C12 are that 47 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C14 are that 31 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C14 are that 32 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Left end and the model of electric capacity C13 are that 19 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and right-hand member and the model of electric capacity C13 are that 18 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; The upper end of electric capacity C10 and electric capacity C11 and model are that 12 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, the lower end of electric capacity C10 and electric capacity C11 and model are that 13 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, the left end of inductance L 1 connects VCC3.3 end, and right-hand member and the model of inductance L 1 are that 13 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected; Termination VCC3.3 on resistance R2, lower end is electrically connected with the left end of electric capacity C4, and lower end and the model of resistance R2 are that 7 pin of the single-chip microcomputer U3 of STM32F103RBT6 are electrically connected, and the right-hand member ground connection GND of electric capacity C4, mechanical key RESSET1 is connected in parallel on the two ends of electric capacity C4.

4. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described power circuit includes mini-usb joint J1, chip U2, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, safety fuse cutout F1, button S1 and plug JP3 that model is NCP551;

The pin USBD-that the pin D-of mini-usb plug J1 and pin D+ are the chip U7 of CH340 by resistance R4 and the model in resistance R5 and serial communication circuit is successively electrically connected with pin USBD+, resistance R6 lower end connects VCC3.3, the upper end of resistance R6 is electrically connected with the pin D+ of mini-usb joint J1, the pin VCC end of mini-usb plug J1 is connected with the left end of safety fuse cutout F1, the right-hand member of safety fuse cutout F1 is electrically connected with the left end of button S1, right-hand member and the model of button S1 are that 1 pin of the chip U2 of NCP551 is electrically connected, the output terminal VCC3.3 of model to be 5 pin of the chip U2 of NCP551 be power circuit, electric capacity C1 and electric capacity C2 be connected in parallel on that model is the chip U2 of NCP551 between 1 pin and 2 pin, model is that 2 pin of the chip U2 of NCP551 connect GND, model is that 3 pin of the chip U2 of NCP551 are electrically connected with 1 pin, the upper end of electric capacity C3 is electrically connected with output terminal VCC3.3, the lower end of electric capacity C3 is held with GND and is electrically connected, JP3 is six pin power plugs, and its 2 pin, 4 pin, 6 pin connect VCC3.3 end, and 1 pin, 3 pin, 5 pin connect GND end.

5. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described LCD display circuit includes liquid crystal screen U1, the slide rheostat R1 and exclusion R7 that model is LCD1602;

Model is that 1 pin of the liquid crystal screen U1 of LCD1602 is connected GND end with 16 pin, and 2 pin are connected VCC5 end with 15 pin, 5 pin and R/W pin connect GND end, and model is that 3 pin of the liquid crystal screen U1 of LCD1602 connect GND end by a slide rheostat R1, 1 pin of exclusion R7 connects VCC5 end, 2 pin direct type number are 14 pin of the liquid crystal screen U1 of LCD1602, 3 pin direct type number are 13 pin of the liquid crystal screen U1 of LCD1602, 4 pin direct type number are 12 pin of the liquid crystal screen U1 of LCD1602, 5 pin direct type number are 11 pin of the liquid crystal screen U1 of LCD1602, 6 pin direct type number are 10 pin of the liquid crystal screen U1 of LCD1602, 7 pin direct type number are 9 pin of the liquid crystal screen U1 of LCD1602, 8 pin direct type number are 8 pin of the liquid crystal screen U1 of LCD1602, 9 pin direct type number are 7 pin of the liquid crystal screen U1 of LCD1602, 10 pin direct type number are 6 pin of the liquid crystal screen U1 of LCD1602, 11 pin direct type number are 4 pin of the liquid crystal screen U1 of LCD1602, model is 7 pin to the 14 pin difference direct type number of the liquid crystal screen U1 of LCD1602 is that the PC0 pin of the single-chip microcomputer U3 of STM32F103RBT6 is to PC7 pin, 4 pin direct type number are the PB1 pin of the single-chip microcomputer U3 of STM32F103RBT6, and 6 pin direct type number are the PB0 pin of the single-chip microcomputer U3 of STM32F103RBT6.

6. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described strain bridge flow collection circuit includes resistance R17, resistance R18, resistance R19, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R38, resistance R39, resistance R40, resistance R41, slide potentiometer P3, slide potentiometer P5, electric capacity C15, electric capacity C16, electric capacity C23, electric capacity C24, electric capacity C25, electric capacity C26, electric capacity C27, electric capacity C28, electric capacity C29, diode D5, diode D6, diode D7, model is the chip of AD620 and model is the chip of OP07,

7. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described water pressure Acquisition Circuit includes pressure transducer U5 that model is MPX5700DP, general-purpose operation amplifier U4 that pressure transducer U6, resistance R30 that model is MPX5700DP, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, electric capacity C30, electric capacity C31, electric capacity C32, electric capacity C33, electric capacity C34, electric capacity C35, diode D8, diode D9, model are LM324-A;

8. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described piezoelectric pump voltage signal acquisition circuit includes diode rectifier bridge D10, resistance R36 and the resistance R37 that 220V turns the step-down transformer T1 of 110V, model is KBJ2510;

220V turns the industrial-frequency alternating current of the primary air termination 220V of the step-down transformer T1 of 110V, one end of secondary winding is electrically connected with the upper end of diode rectifier bridge D10, the other end of secondary winding is electrically connected with the lower end of diode rectifier bridge D10, the left end of diode rectifier bridge D10 is electrically connected with the upper end of resistance R36, the lower end of resistance R36 is electrically connected with the upper end of resistance R37, and the lower end of resistance R37 is electrically connected rear also ground connection GND with the right-hand member of diode rectifier bridge D10; The lower end of resistance R36 is the output terminal that the ADC3 pin of the single-chip microcomputer U3 being STM32F103RBT6 is connected with model.

9. according to piezoelectric pump performance testing device according to claim 1, it is characterized in that, described serial communication circuit includes chip U7 that model is CH340, crystal oscillator Y3, electric capacity C36, electric capacity C37, electric capacity C38, electric capacity C39 and electric capacity C40;

Model is that 4 pin of the chip U7 of CH340 are electrically connected with the right-hand member of electric capacity C38, the left end ground connection GND of electric capacity C38, the upper end electrical connection of crystal oscillator Y3 left end and electric capacity C39, and is electrically connected with 7 pin that model is the chip U7 of CH340; The upper end electrical connection of crystal oscillator Y3 right-hand member and electric capacity C40, and 8 pin being the chip U7 of CH340 with model are electrically connected, the lower end ground connection GND of electric capacity C39 and electric capacity C40, model is that 16 pin of the chip U7 of CH340 are held with VCC5 and are electrically connected, the left end of electric capacity C36 and electric capacity C37 is held with meeting VCC5, the right-hand member ground connection GND of electric capacity C36 and electric capacity C37; Model is the 1 pin ground connection GND of the chip U7 of CH340.