CN204652328U - Ripple drive circuit is sent out in the pulse of a kind of ultrasonic wave controllable type - Google Patents

Abstract

The utility model discloses the pulse of a kind of ultrasonic wave controllable type and sends out ripple drive circuit, comprises cpu controller unit, 555 oscillator units, sends out wave phase lock unit and drive circuit unit; One output of cpu controller unit is connected to sends out wave phase lock unit, the output of 555 oscillator units is connected to respectively sends out wave phase lock unit and drive circuit unit, the output sending out wave phase lock unit is connected to drive circuit unit, another output is connected to cpu controller unit, and the output of drive circuit unit is connected to ultrasonic sensor probe.Apply this drive circuit and can ensure a ultrasonic wave stable ripple at every turn, each receipts ripple situation is identical, substantially increases the accuracy of applying ultrasonic lever meter to measure, stability and reliability.

Description

Ripple drive circuit is sent out in the pulse of a kind of ultrasonic wave controllable type

Technical field

The utility model belongs to ultrasonic pulse Driving technique field, and particularly ripple drive circuit is sent out in the pulse of a kind of ultrasonic wave controllable type.

Background technology

Ultrasonic level gage is by the digital liquid level instrument of Microprocessor S3C44B0X, in in measuring process, ultrasonic pulse is sent by transducer (transducer), sound wave is received by same transducer after liquid surface reflection, convert the signal of telecommunication to by piezoelectric crystal or magnetostrictive device, and by sound wave transmitting and receiving between time calculating sensor to the distance on fluid to be measured surface.

In prior art, ultrasonic level gage uses 555 oscillator units to produce the square wave of fixed frequency, ultrasonic sensor probe is driven to send out ripple by the square wave of CPU gating intercepting certain hour again, this mode can not ensure that each square wave phase intercepted is all identical, thus cause the wave property at every turn sending out ripple different, wave stability is received in impact, thus reduces the accuracy of measurement result.

Utility model content

The purpose of this utility model is to provide a kind of ultrasonic level gage to send out ripple drive circuit and driving method thereof, drive ultrasonic sensor probe can make to send out wave property by this drive circuit to fix, like this when measurement environment is substantially constant, the quality receiving ripple is also basicly stable, the measured value received is stablized, reliably, truly.

For reaching above-mentioned utility model object, the utility model is realized by following technical scheme:

Ripple drive circuit is sent out in the pulse of a kind of ultrasonic wave controllable type, comprises cpu controller unit, 555 oscillator units, sends out wave phase lock unit and drive circuit unit;

One output of cpu controller unit is connected to sends out wave phase lock unit, the output of 555 oscillator units is connected to respectively sends out wave phase lock unit and drive circuit unit, the output sending out wave phase lock unit is connected to drive circuit unit, another output is connected to cpu controller unit, and the output of drive circuit unit is connected to ultrasonic sensor probe;

Send out wave phase lock unit and comprise a d type flip flop and a photoelectrical coupler, the data input pin of d type flip flop is connected to the output of cpu controller unit, the data output plus terminal of d type flip flop is connected to the input of photoelectrical coupler, the clock end of d type flip flop is connected to the output of 555 oscillator units, the output of this 555 oscillator unit is also connected to a first input end of drive circuit unit, one second input of drive circuit unit is connected to the output of photoelectrical coupler, and the data output plus terminal of d type flip flop is also connected to cpu controller unit.

To do optimal technical scheme of the present utility model:

Further, ripple drive circuit is sent out in the pulse of aforesaid ultrasonic wave controllable type, 555 oscillator units comprise one 555 oscillators, the timing circuit of 555 oscillators is made up of two fixed value resistances, a potentiometer and a capacitances in series, the discharge end of 555 oscillators is connected to the tie point of two fixed value resistances, and the high-triggering end of 555 oscillators and low triggering end are all connected to the moving contact of potentiometer.

Ripple drive circuit is sent out in the pulse of aforesaid ultrasonic wave controllable type, and drive circuit unit comprises the inverter U10A ~ U10E of charged source, resistance R46 ~ R50, switching tube Q3 ~ Q4, storage capacitor C40 and transformer L4;

In parallel after inverter U10B, U10C difference series resistance R49, R50, this parallel circuit in series is between the output and the input of switching tube Q4 of resistance inverter U10A, in parallel after inverter U10D, U10E difference series resistance R47, R48, this parallel circuit in series is between resistance R46 and the input of switching tube Q3, the output of 555 oscillator units is connected to the input of inverter U10A, U10D, U10E through resistance R46, the output of photoelectrical coupler is connected to the power end positive pole of inverter U10A ~ U10E;

The controlled collector electrode connection transformer L4 primary coil two ends of switching tube Q3 ~ Q4, emitter and storage capacitor C40 negative pole are connected power supply ground jointly, and transformer L4 primary coil common port is connected power supply 24V jointly with storage capacitor C40 positive pole.

The utility model compared with prior art tool has the following advantages:

Because a wave property difference for ultrasonic level gage can affect receipts wave stability, and send out the time that wave property comprises the phase place of ultrasonic probe starting of oscillation, the amplitude of vibration and vibration, of the present utility model ripple drive circuit makes the phase place at every turn sending out ripple consistent, Oscillation Amplitude is identical, time of vibration is controlled by CPU and d type flip flop triggers, so it is identical to reach time of vibration; Apply this drive circuit and can ensure a ultrasonic wave stable ripple at every turn, each receipts ripple situation is identical, substantially increases the accuracy of applying ultrasonic lever meter to measure, stability and reliability.

Accompanying drawing explanation

Fig. 1 is the structured flowchart that ripple drive circuit is sent out in ultrasonic wave controllable type pulse designed by the utility model;

Fig. 2 is 555 oscillator unit circuit theory diagrams in the utility model;

Fig. 3 sends out wave phase lock unit circuit theory diagrams in the utility model;

Fig. 4 is drive circuit unit circuit theory diagrams in the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, technical solutions of the utility model are described in detail:

embodiment one

As shown in Figure 1, ultrasonic wave controllable type of the present utility model pulse is sent out ripple drive circuit and is comprised cpu controller unit 1, 555 oscillator units 2, send out wave phase lock unit 3 and drive circuit unit 4, one output UL_SEND of cpu controller unit 1 is connected to and sends out wave phase lock unit 3, the output W_SEND of 555 oscillator units 2 is connected to respectively and sends out wave phase lock unit 3 and drive circuit unit 4, send out wave phase lock unit 3 an output be connected to drive circuit unit 4, another output is connected to an input UL_I_SEND of cpu controller unit 1, the output of drive circuit unit 4 is connected to ultrasonic sensor probe 5.

embodiment two

As shown in Figure 2, 555 oscillator units 2 adopt model NE555DR by 555 oscillator U9() form, its timing circuit is by two fixed value resistance R37, R38, a potentiometer VR2 and electric capacity C33 composition in sequential series, the discharge end DIS(7 pin of 555 oscillator U9) be connected to two fixed value resistance R37, the tie point of R38, high-triggering end THR(6 pin) and low triggering end TRIG(2 pin) be all connected to the moving contact of potentiometer VR2, reset end R(4 pin) with power end VCC(8 pin) be connected+5V power supply, control end CVolt(5 pin) be connected to ground DGND through electric capacity C34, output Q(3 pin) output signal W_SEND,

The output cycle of regulator potentiometer VR2 control signal W_SEND, its cycle:

f = 1.44/（R37+2*（R38+VR2））/C29 ；

The parameter of shown with reference to the accompanying drawings circuit calculates the cycle and regulates between 6.48kHz ~ 115.185kHz.

As shown in Figure 3, send out wave phase lock unit 3 and comprise a d type flip flop U7A(employing model HEF4013BT) and photoelectrical coupler PC1(employing model TLP521-1GB), the data input pin D1(5 pin of d type flip flop U7A) the output UL_SEND of cpu controller unit 1 is connected to through resistance R42, UL_SEND signal is for controlling the state of the output Q1 of d type flip flop U7A, contact resistance R44 between resistance R42 and ground DGND, the data output plus terminal Q1(1 pin of d type flip flop U7A) through resistance R43, R45 is connected to the input (1 pin) of photoelectrical coupler PC1, the 2 pin ground connection DGND of photoelectrical coupler PC1, 4 pin connect+5V power supply, shunt capacitance C38 between 4 pin to ground DGND, C39, the output (3 pin) of photoelectrical coupler PC1 outputs signal SW, the clock end CP1(3 pin of d type flip flop U7A) the output Q of 555 oscillator U9 is connected to through resistance R39, CD1 end (4 pin) of d type flip flop U7A and SD1 end (6 pin) is ground connection DGND all, resistance R43, the series connection point contact resistance R41 of R45, the other end output signal U L_I_SEND of resistance R41, this signal is connected to the input UL_I_SEND of cpu controller unit 1, CPU control unit 1 detects that the rising edge saltus step of UL_I_SEND starts the trailing edge edge of accumulative W_SEND signal, when CPU control unit is accumulated to the number of pulses set, change the state of its output signal U L_SEND, the next rising edge that d type flip flop U7A is triggered to W_SEND signal along time finishing control,

Signal W_SEND is to clock end CP1 triggering signal of d type flip flop U7A, and CPU controls its input D1, the truth table according to following HEF4013BT:

Because CD1, SD1 are low level L all the time, now the output of Q1 is by CP1 rising edging trigger, when output Q1 state after triggering triggers with CP1, the state of D1 is identical, thus makes the level saltus step of signal UL_I_SEND and photoelectrical coupler PC1 input and the rising edge synchronization of signal W_SEND.

As shown in Figure 4, inverter U10A ~ U10E(that drive circuit unit 4 comprises charged source adopts model SN74LS04DR, its 14 pin VCC looks closely the second input (i.e. Enable Pin) for drive circuit unit 4, also be the power end positive pole of each inverter), resistance R46 ~ R50, switching tube Q3 ~ Q4(model TIP122), storage capacitor C40 and transformer L4, inverter U10B, U10C is series resistance R49 respectively, in parallel after R50, this parallel circuit in series is between the output and the input of switching tube Q4 of inverter U10A, inverter U10D, U10E is series resistance R47 respectively, in parallel after R48, this parallel circuit in series is between resistance R46 and the input of switching tube Q3, the signal W_SEND of the output Q output of 555 oscillator U9 is the first input end of driving power unit 4 through one end of resistance R46(resistance R46 Received signal strength W_SEND) be connected to inverter U10A, U10D, the input of U10E, the 14 pin VCC that the signal SW that the output of photoelectrical coupler PC1 exports is connected to SN74LS04DR hold, for controlling the break-make of inverter SN74LS04DR, the controlled collector electrode connection transformer L4 primary coil two ends of switching tube Q3 ~ Q4, emitter and storage capacitor C40 negative pole are connected power supply ground jointly, transformer L4 primary coil common port is connected power supply 24V jointly with storage capacitor C40 positive pole, the break-make change of photoelectrical coupler and the rising edge of signal W_SEND are along consistent, thus control two switching tube Q3, the break-make of Q4, generate the sine wave that can control through transformer and hold driving ultrasonic sensor probe by EXCIT, each waveform phase exported is made to be all consistent.

Cpu controller unit adopts cpu controller to control to send out wave impulse quantity, when preparing to send out ripple, CPU control output end UL_SEND transfers high level to by low level, when 555 oscillator output end W_SEND signals become rising edge edge, the level (high level) that d type flip flop U7A output Q1 is triggered identical with UL_SEND signal, now CPU control unit also recognizes the state of d type flip flop output signal U L_I_SEND, when detecting that the rising edge saltus step of UL_I_SEND starts the trailing edge edge of accumulative W_SEND signal, after cpu controller count down to a setting wave impulse number, control break UL_SEND signal is low level, when the next rising edges of 555 oscillator output end W_SEND signals along time, d type flip flop output Q1 triggers the level identical with UL_SEND signal, for low level, whole control procedure ensure that saltus step and the 555 oscillator rising edge synchronization of d type flip flop output, the output of d type flip flop controls photoelectrical coupler, complete the on/off to reverser U10, the edge of break-make is just synchronous to the signal of the signal W_SEND of inverter input resistance R46 with 555 oscillators, the W_SEND signal of input is divided into the reverse signal of two-way by inverter, control the alternately break-make of triode Q3 ~ Q4 respectively, the electric current of control transformer primary coil alternately passes through, amplifying after voltage through transformer encourages ultrasonic probe to send out ripple.

Above embodiment is only and technological thought of the present utility model is described; protection range of the present utility model can not be limited with this; every technological thought according to the utility model proposes, any change that technical scheme basis is done, all falls within the utility model protection range.

Claims (3)

1. a ripple drive circuit is sent out in the pulse of ultrasonic wave controllable type, it is characterized in that, comprises cpu controller unit (1), 555 oscillator units (2), sends out wave phase lock unit (3) and drive circuit unit (4);

One output of described cpu controller unit (1) is connected to sends out wave phase lock unit (3), the output of 555 oscillator units (2) is connected to respectively sends out wave phase lock unit (3) and drive circuit unit (4), the output sending out wave phase lock unit (3) is connected to drive circuit unit (4), another output is connected to cpu controller unit (1), and the output of drive circuit unit (4) is connected to ultrasonic sensor probe (5);

Described wave phase lock unit (3) comprises a d type flip flop and a photoelectrical coupler, the data input pin of d type flip flop is connected to the output of cpu controller unit (1), the data output plus terminal of d type flip flop is connected to the input of photoelectrical coupler, the clock end of d type flip flop is connected to the output of 555 oscillator units (2), the output of this 555 oscillator unit (2) is also connected to a first input end of drive circuit unit (4), one second input of drive circuit unit (4) is connected to the output of photoelectrical coupler, the data output plus terminal of d type flip flop is also connected to cpu controller unit (1).

2. ripple drive circuit is sent out in ultrasonic wave controllable type according to claim 1 pulse, it is characterized in that, described 555 oscillator units (2) comprise one 555 oscillators, the timing circuit of 555 oscillators is made up of two fixed value resistances, a potentiometer and a capacitances in series, the discharge end of 555 oscillators is connected to the tie point of two fixed value resistances, and the high-triggering end of 555 oscillators and low triggering end are all connected to the moving contact of potentiometer.

3. ripple drive circuit is sent out in ultrasonic wave controllable type according to claim 1 pulse, it is characterized in that, described drive circuit unit (4) comprises the inverter U10A ~ U10E of charged source, resistance R46 ~ R50, switching tube Q3 ~ Q4, storage capacitor C40 and transformer L4;

In parallel after inverter U10B, U10C difference series resistance R49, R50, this parallel circuit in series is between the output and the input of switching tube Q4 of resistance inverter U10A, in parallel after inverter U10D, U10E difference series resistance R47, R48, this parallel circuit in series is between resistance R46 and the input of switching tube Q3, the output of 555 oscillator units (2) is connected to the input of inverter U10A, U10D, U10E through resistance R46, the output of photoelectrical coupler is connected to the power end positive pole of inverter U10A ~ U10E;

The controlled collector electrode connection transformer L4 primary coil two ends of switching tube Q3 ~ Q4, emitter and storage capacitor C40 negative pole are connected power supply ground jointly, and transformer L4 primary coil common port is connected power supply 24V jointly with storage capacitor C40 positive pole.