CN203988125U - Elastogram excitation apparatus ultrasonic transmit circuit - Google Patents
Elastogram excitation apparatus ultrasonic transmit circuit Download PDFInfo
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- CN203988125U CN203988125U CN201420422511.8U CN201420422511U CN203988125U CN 203988125 U CN203988125 U CN 203988125U CN 201420422511 U CN201420422511 U CN 201420422511U CN 203988125 U CN203988125 U CN 203988125U
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Abstract
The utility model discloses a kind of elastogram excitation apparatus ultrasonic transmit circuit, comprise pulse signal genration module, power amplifier module and ultrasonic transducer, described pulse signal genration module comprises PWM wave generation circuit, square wave generation circuit, AND circuit and pulse width modulation circuit, described PWM wave generation circuit is for generation of the adjustable PWM ripple signal of pulse width, described square wave generation circuit is for generation of high-frequency square-wave signal, this high-frequency square-wave signal and described PWM ripple signal are modulated through described AND circuit, thereby regulate the square-wave pulse number of sending into described power amplifier module, described pulse width modulation circuit is for adjusting the pulse signal dutycycle of sending into described power amplifier module.Its remarkable result is: this circuit realization link is few, has adopted E power-like amplifier to process, and has greatly improved power amplification efficiency, and has realized the adjusting of output ultrasonic wave power.
Description
Technical field
This utility model relates to medical ultrasonic pulse elastogram technical field, specifically, is a kind of elastogram excitation apparatus ultrasonic transmit circuit.
Background technology
Medical ultrasonic radiant force elastogram with its unique high resolution, real-time detect, the advantage such as easy to use, cheap, become detection organizing means indispensable in modern medicine.
The condenser type radiating circuits that adopt in existing ultrasonic radiation force elastogram technology more, the voltage pulse signal producing mainly boosts to DC voltage by introducing outside boost module, be about to unidirectional current and first convert alternating current to, through transformation link, voltage is promoted again, then produce the needed potential pulse of excitation ultrasound transducer, then say that by ultrasonic transducer a power conversion is that acoustic energy is exported.Although this method comparative maturity, exists realization link many, power amplification efficiency is low, efficiency is low, and power consumption is larger, the non-adjustable deficiency that waits of output, at medical ultrasonic radiant force elastogram etc., power consumption is required to harsh occasion, it is particularly outstanding that problem seems.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of elastogram excitation apparatus ultrasonic transmit circuit, and this circuit realization link is few, and power amplification efficiency is high, and output is adjustable.
For achieving the above object, this utility model is explained a kind of elastogram excitation apparatus ultrasonic transmit circuit, comprise pulse signal genration module, power amplifier module and ultrasonic transducer, described pulse signal genration module is for generation of high frequency electric pulse signal, described power amplifier module amplifies the power of high frequency electric pulse signal, described ultrasonic transducer is converted to ultrasonic signal output by the signal of telecommunication of power amplifier module output, its key is: described pulse signal genration module comprises PWM wave generation circuit, square wave generation circuit, AND circuit and pulse width modulation circuit, described PWM wave generation circuit is for generation of the adjustable PWM ripple signal of pulse width, described square wave generation circuit is for generation of high-frequency square-wave signal, this high-frequency square-wave signal and described PWM ripple signal are modulated through described AND circuit, thereby regulate the square-wave pulse number of sending into described power amplifier module, described pulse width modulation circuit is for adjusting the pulse signal dutycycle of sending into described power amplifier module.
First pulse signal genration module produces the adjustable low frequency PWM ripple signal of pulse width by PWM wave generation circuit, by square wave generation circuit, produce high-frequency square-wave signal, then low frequency PWM ripple and high frequency square wave are sent into AND circuit and realize the modulation of PWM ripple to high-frequency square-wave signal, by the pulse number in the pulse width control ingoing power amplification module of adjusting PWM ripple, thereby the hyperacoustic power of regulation output, then the interruption square-wave signal of AND circuit output is sent into pulse width modulation circuit, the pulse signal dutycycle of power amplifier module is sent in adjustment, electric impulse signal after adopting again power amplifier module to modulation carries out power amplification, last ultrasonic transducer is the output of ultrasonic acoustic energy by the electric energy conversion in AC signal.This circuit need not be introduced outside boost module DC voltage is boosted, and realization link is few, and power amplification efficiency is high, and the power of output ultrasonic wave is adjustable.
In order to ensure the accuracy that enters the pulse signal dutycycle of power amplifier module, the effect of guaranteed output amplification module output waveform, described pulse width modulation circuit comprises SN74LVC1G123DCTR one-shot multivibrator, after the signal input part series capacitance C12 of this one-shot multivibrator, be connected with the signal output part of described AND circuit, ground connection after the control input end series capacitance C5 of described one-shot multivibrator, the control input end of described one-shot multivibrator is series resistance R1 successively also, after variable resistance R2, be connected with 5V power supply, the signal output part of described one-shot multivibrator is as the outfan of described pulse width modulation circuit.
In order to improve power amplification efficiency, described power amplifier module adopts E class power amplification circuit.
As further describing, described E class power amplification circuit comprises switching tube Q, the grid of switching tube Q is as signal input part, the source ground of switching tube Q, after the drain electrode tandem electric inductance coil RFC of switching tube Q, be connected with DC source, the drain electrode of switching tube Q is also connected in series the rear ground connection of capacitor C 1, and the drain electrode of switching tube Q meets output loading R after being also connected in series successively capacitor C 0 and inductance L 0.
For the work of gauge tap pipe, on the grid of described switching tube Q, be connected with switch tube driving circuit, this switch tube driving circuit comprises LM5114BMF switching tube grid drive chip, the signal input part of this switching tube grid drive chip is connected with the signal output part of described pulse width modulation circuit, described switching tube grid drive chip draw current output terminal series resistor R4 after be connected with the signal input part of described power amplification circuit, after the filling current output terminal series resistor R5 of described switching tube grid drive chip, be connected with drawing current output terminal.
In order to improve the load capacity of circuit, improve ultrasound wave waveform, between described power amplifier module and ultrasonic transducer, be also connected with load matching circuit, this load matching circuit is comprised of capacitor C 2 and inductance L 1.
For the ease of controlling, described PWM wave generation circuit adopts AT89C51 one-chip computer module, and described square wave generation circuit adopts AD9850 module, and the control signal of this AD9850 module is exported by described AT89C51 one-chip computer module.
Remarkable result of the present utility model is: this circuit realization link is few, at power amplifier, has partly adopted E power-like amplifier to process, and has greatly improved power amplification efficiency; Adopt adjustable PWM ripple and the high-frequency square-wave signal of AND circuit pulse-width to modulate, the control of realization to the square wave number of input power amplifying circuit, and then the power of having realized whole circuit output ultrasonic wave is adjustable, can be used as the drive force source of good medical ultrasonic radiant force elastogram device.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present utility model;
Fig. 2 is PWM wave generation circuit and square wave generation circuit schematic diagram;
Fig. 3 is pulse width modulation circuit and switch tube driving circuit schematic diagram in Fig. 1;
Fig. 4 is power amplification circuit schematic diagram in Fig. 1;
Fig. 5 is load matching circuit schematic diagram in Fig. 1;
Fig. 6 is a reduction voltage circuit schematic diagram in power module;
Fig. 7 is secondary reduction voltage circuit schematic diagram in power module.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model and operation principle are described in further detail.
As shown in Figure 1, a kind of elastogram excitation apparatus ultrasonic transmit circuit, comprise pulse signal genration module, power amplifier module and ultrasonic transducer, described pulse signal genration module comprises PWM wave generation circuit, square wave generation circuit, AND circuit and pulse width modulation circuit, described PWM wave generation circuit adopts one-chip computer module to produce the adjustable PWM ripple of pulse width, described square wave generation circuit adopts AD9850 module to produce high-frequency square-wave signal, this high-frequency square-wave signal and described PWM ripple signal are modulated through described AND circuit, thereby regulate the square-wave pulse number of sending into described power amplifier module, control described power amplifier module output, described pulse width modulation circuit is for adjusting the pulse signal dutycycle of sending into described power amplifier module, the power of the high frequency electric pulse signal of described power amplifier module pulse-width modulated circuit output amplifies, described ultrasonic transducer is converted to ultrasonic signal output by the signal of telecommunication of power amplifier module output, between described power amplifier module and ultrasonic transducer, be also connected with load matching circuit.
Referring to accompanying drawing 2, described PWM wave generation circuit adopts AT89C51 one-chip computer module, and described square wave generation circuit adopts AD9850 module, and the control signal of this AD9850 module is exported by described AT89C51 one-chip computer module.As shown in the figure, the adjustable PWM ripple of P2.0 pin output pulse width of single-chip microcomputer, the P1.0-P1.7 pin of single-chip microcomputer is connected with the D0-D7 data/address bus of AD9850 module, as the parallel data input port of AD9850 module, exports 40 and controls the work of Data Control AD9850 module.The RX of single-chip microcomputer, TX pin are connected with W-CLK, the FQ-UD pin of AD9850 module, as I/O mouth output data, AD9850 module are controlled.The RESET pin of single-chip microcomputer is connected with the RESET pin of AD9850;
AD9850 module completes after the input of 40 control data, first from the pure sinusoidal signal of IOUT pin output spectrum, after peripheral low-pass filter circuit filtering low frequency signal, by VINP pin, entered the high-speed comparator of AD9850 inside modules, finally by the QOUTP pin of AD9850 module, export high-frequency square-wave signal.In this programme, the frequency setting of this high-frequency square-wave signal is 10MHz.As shown in Figure 2, the resistance 23 of described low-pass filter circuit in figure, capacitor C 21, C22, C23, C24, C25 and inductance L 11, L12 form.After the 10MHz high-frequency square-wave signal that the low frequency PWM ripple signal that AT89C51 one-chip computer module produces and AD9850 module produce is sent into described AND circuit modulation, formation is interrupted square-wave signal output, thus the work of power ratio control amplification module.
Wherein, the signal on the accessible external control pulse input pin of AD9850 module is controlled.Now this signal can be the undersuing that the external control modules such as ARM, 555 astatic multivibrators or DSP produce, thereby meet more flexibly, controls.
In order to improve power amplification efficiency, described power amplifier module adopts E class power amplification circuit, in order to guarantee that the dutycycle of input signal is 50%, therefore designs pulse width modulation circuit the dutycycle of input signal is adjusted.As shown in Figure 3, described pulse width modulation circuit comprises SN74LVC1G123DCTR one-shot multivibrator, after the signal input part series capacitance C12 of this one-shot multivibrator, be connected with the signal output part of described AND circuit, ground connection after the control input end R/C series capacitance C11 of this one-shot multivibrator, the control input end R/C of described one-shot multivibrator also successively series resistance R1 with after variable resistance R2, be connected with 5V power supply, the signal output part of described one-shot multivibrator is connected with the described signal input part of stating power amplifier module.The dutycycle of described pulse width modulation circuit output signal is determined by capacitor C 11 and the ratio of resistance R 1+R2, by regulating the resistance of variable resistance R2, make the dutycycle of pulse signal genration module output signal in strict conformity with 50%, deliver to again rear class and carry out power amplifier, guaranteed like this effect of the output waveform of power amplifier module.
From Fig. 3, it can also be seen that, in order to drive the switching tube work in E class power amplifier, control input end at power amplification circuit is connected with switch tube driving circuit, this switch tube driving circuit comprises LM5114BMF switching tube grid drive chip, the signal input part IN of this switching tube grid drive chip is connected with the signal output part of described pulse width modulation circuit, described switching tube grid drive chip draw current output terminal P-OUT series resistor R4 after be connected with the signal input part of power amplification circuit, after the filling current output terminal N-OUT series resistor R5 of described switching tube grid drive chip, be connected with drawing current output terminal P-OUT.
As shown in Figure 4, described E class power amplification circuit comprises switching tube Q, the grid of switching tube Q is connected as signal input part and with the signal output part of described switch tube driving circuit, the source ground of switching tube Q, after the drain electrode tandem electric inductance coil RFC of switching tube Q, be connected with 24V DC source, the drain electrode of switching tube Q is also connected in series the rear ground connection of capacitor C 1, and the drain electrode of switching tube Q meets output loading R after being also connected in series successively capacitor C 0 and inductance L 0, and wherein capacitor C 0 forms LC resonance circuit with inductance L 0.RFC, for circuit provides galvanic current stream, reduces input current stricture of vagina ripple; Switching tube Q operating frequency is 10MHz, and dutycycle is 0.5; C1 is shunt capacitance, mainly plays energy storage effect, and the size of C1 determines the quality of drain voltage waveform, and in resonant tank, the resonant frequency of C0 and L0 is 10MHz.The square-wave signal of pulse-width modulation circuit output plays on-off action in power amplification circuit, and when input square wave is high level, switching tube is in " conducting " state, output current wave; When input square wave is low level, switching tube is in " cut-off " state, output voltage waveforms.The signal of exporting due to switching tube drain electrode is impure sine wave signal, need filter low frequency signal by LC resonant tank, the pure sine wave signal that then output frequency is 10MHz.
As shown in Figure 5, described load matching circuit is comprised of capacitor C 2 and inductance L 1.By this load matching circuit, can improve the load capacity of circuit, improve impulse ultrasound waveform.
In the present embodiment, described pulse generation module and power amplifier module are powered by power module, this power module comprises 24V external direct current power supply, reduction voltage circuit and secondary reduction voltage circuit, and wherein 24V external direct current power supply provides DC source for described power amplification circuit.
As shown in Figure 6, a described reduction voltage circuit is LM2575HVS-ADJ voltage stabilizing blood pressure lowering chip, and the input of this voltage stabilizing blood pressure lowering chip is connected with 24V external direct current power supply is anodal, and output 7.5V power supply is described switch tube driving circuit power supply.
As shown in Figure 7, described secondary reduction voltage circuit is MC7805CD2T blood pressure lowering chip, the input of this blood pressure lowering chip is connected with the outfan of a described reduction voltage circuit, and output 5V power supply is described one-chip computer module, AD9850 module and pulse width modulation circuit power supply.
The operation principle of this radiating circuit is:
AT89C51 single-chip microcomputer output control signal, control AD9850 module completes after the input of 40 control data, QOUTP pin output by AD9850 module obtains the high-frequency square-wave signal that required frequency is 10MHz, adjustable PWM ripple signal and the 10MHz square-wave signal of pulse width afterwards AT89C51 single-chip microcomputer being produced sent into described AND circuit, realize the modulation of PWM ripple to high-frequency square-wave signal, then by the resistance of variable resistance R2 in regulating impulse width modulation circuit, to sending into the dutycycle of the pulse signal of power amplifier module, adjust, adopt afterwards power amplification circuit to amplify adjusting the power of the signal of telecommunication after dutycycle, output frequency is the pure sinusoidal wave form of 10MHz, finally by ultrasonic transducer, the 10MHz signal of telecommunication being converted to ultrasound wave exports,
In the time need to regulating the power of output ultrasonic wave, by regulating the pulse width of PWM ripple signal, through AND circuit, realizing PWM ripple again modulates square-wave signal, change the square-wave pulse number of sending into described pulse width modulation circuit, thereby the output of regulating power amplifying circuit, realizes the adjusting of output ultrasonic wave power.
Claims (7)
1. an elastogram excitation apparatus ultrasonic transmit circuit, comprise pulse signal genration module, power amplifier module and ultrasonic transducer, described pulse signal genration module is for generation of high frequency electric pulse signal, described power amplifier module amplifies the power of high frequency electric pulse signal, described ultrasonic transducer is converted to ultrasonic signal output by the signal of telecommunication of power amplifier module output, it is characterized in that: described pulse signal genration module comprises PWM wave generation circuit, square wave generation circuit, AND circuit and pulse width modulation circuit, described PWM wave generation circuit is for generation of the adjustable PWM ripple signal of pulse width, described square wave generation circuit is for generation of high-frequency square-wave signal, this high-frequency square-wave signal and described PWM ripple signal are modulated through described AND circuit, thereby regulate the square-wave pulse number of sending into described power amplifier module, described pulse width modulation circuit is for adjusting the pulse signal dutycycle of sending into described power amplifier module.
2. elastogram excitation apparatus ultrasonic transmit circuit according to claim 1, it is characterized in that: described pulse width modulation circuit comprises SN74LVC1G123DCTR one-shot multivibrator, after the signal input part series capacitance C12 of this one-shot multivibrator, be connected with the signal output part of described AND circuit, ground connection after the control input end series capacitance C11 of this one-shot multivibrator, the control input end of described one-shot multivibrator is series resistance R1 successively also, after variable resistance R2, be connected with 5V power supply, the signal output part of described one-shot multivibrator is as the outfan of described pulse width modulation circuit.
3. elastogram excitation apparatus ultrasonic transmit circuit according to claim 1 and 2, is characterized in that: described power amplifier module adopts E class power amplification circuit.
4. elastogram excitation apparatus ultrasonic transmit circuit according to claim 3, it is characterized in that: described E class power amplification circuit comprises switching tube Q, the grid of switching tube Q is as signal input part, the source ground of switching tube Q, after the drain electrode tandem electric inductance coil RFC of switching tube Q, be connected with DC source, the drain electrode of switching tube Q is also connected in series the rear ground connection of capacitor C 1, and the drain electrode of switching tube Q meets output loading R after being also connected in series successively capacitor C 0 and inductance L 0.
5. elastogram excitation apparatus ultrasonic transmit circuit according to claim 4, it is characterized in that: on the grid of described switching tube Q, be connected with switch tube driving circuit, this switch tube driving circuit comprises LM5114BMF switching tube grid drive chip, the signal input part of this switching tube grid drive chip is connected with the signal output part of described pulse width modulation circuit, described switching tube grid drive chip draw current output terminal series resistor R4 after be connected with the signal input part of described power amplification circuit, after the filling current output terminal series resistor R5 of described switching tube grid drive chip, be connected with drawing current output terminal.
6. elastogram excitation apparatus ultrasonic transmit circuit according to claim 1, is characterized in that: between described power amplifier module and ultrasonic transducer, be also connected with load matching circuit, this load matching circuit is comprised of capacitor C 2 and inductance L 1.
7. elastogram excitation apparatus ultrasonic transmit circuit according to claim 1, it is characterized in that: described PWM wave generation circuit adopts AT89C51 one-chip computer module, described square wave generation circuit adopts AD9850 module, and the control signal of this AD9850 module is exported by described AT89C51 one-chip computer module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422511.8U CN203988125U (en) | 2014-07-29 | 2014-07-29 | Elastogram excitation apparatus ultrasonic transmit circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420422511.8U CN203988125U (en) | 2014-07-29 | 2014-07-29 | Elastogram excitation apparatus ultrasonic transmit circuit |
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| CN203988125U true CN203988125U (en) | 2014-12-10 |
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| CN201420422511.8U Expired - Fee Related CN203988125U (en) | 2014-07-29 | 2014-07-29 | Elastogram excitation apparatus ultrasonic transmit circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525226A (en) * | 2017-09-20 | 2019-03-26 | 上海瑞影医疗科技有限公司 | A kind of high-voltage pulse transmit circuit for ophthalmology ultrasonic diagnostic equipment |
| CN111200375A (en) * | 2018-11-20 | 2020-05-26 | 美国西门子医疗系统股份有限公司 | Switched capacitor for elastic mode imaging with ultrasound |
| WO2022253356A1 (en) * | 2021-09-14 | 2022-12-08 | 天津理工大学 | Ultrasonic excitation circuit |
-
2014
- 2014-07-29 CN CN201420422511.8U patent/CN203988125U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525226A (en) * | 2017-09-20 | 2019-03-26 | 上海瑞影医疗科技有限公司 | A kind of high-voltage pulse transmit circuit for ophthalmology ultrasonic diagnostic equipment |
| CN109525226B (en) * | 2017-09-20 | 2023-06-02 | 上海瑞影医疗科技有限公司 | High-voltage pulse transmitting circuit for ophthalmic ultrasonic diagnostic equipment |
| CN111200375A (en) * | 2018-11-20 | 2020-05-26 | 美国西门子医疗系统股份有限公司 | Switched capacitor for elastic mode imaging with ultrasound |
| CN111200375B (en) * | 2018-11-20 | 2024-01-16 | 美国西门子医疗系统股份有限公司 | Switched capacitor for elastography using ultrasound |
| WO2022253356A1 (en) * | 2021-09-14 | 2022-12-08 | 天津理工大学 | Ultrasonic excitation circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20180729 |