CN103731166A - Frequency adjustable ultrasonic emission driving device - Google Patents

Abstract

The invention discloses an ultrasonic emission drive device with adjustable frequency, which includes an ultrasonic transmitter, a pulse high-voltage generator, a multi-frequency pulse generation signal control module, and a power supply module. The multi-frequency pulse generation signal control module is used to generate multi-frequency Low-voltage pulse signal; the pulse high-voltage generator receives the multi-frequency low-voltage pulse signal and outputs a high-voltage pulse signal; the ultrasonic transmitter receives the high-voltage pulse signal and emits ultrasonic waves; the power module is used for the driving device Power supply; wherein, the pulse high-voltage generator includes a high-voltage pulse output terminal composed of a P-type MOS tube and an N-type MOS tube, and the P-type MOS tube and the N-type MOS tube are connected into a Class B working state and work alternately. The invention improves the circuit using a single MOS tube as an output stage, improves the performance of the circuit, and can generate ultrasonic waves more effectively; adopting double MOS tubes is beneficial to the service life of the MOS tubes.

Description

A Frequency Adjustable Ultrasonic Transmitting Driving Device

technical field

The invention relates to the technical field of ultrasonic imaging, in particular to an ultrasonic transmitting drive device with adjustable frequency.

Background technique

Ultrasound imaging plays an important clinical role in medical testing. Ultrasound imaging can be used to observe the shape of muscles and bones under the skin, so as to judge the patient's disease condition. Ultrasound transmission is a necessary condition for ultrasound imaging, so the control of ultrasound transmission is a key part in ultrasound imaging.

Patent No. CN200920146216.3 proposes an ultrasonic transceiver circuit, which can realize synchronous reception and transmission of ultrasonic waves through the control of the ultrasonic transceiver unit, but this circuit can only generate low-frequency pulses, and the frequency is fixed, and cannot generate pulses of different frequencies. Ultrasonic emission front end.

At present, for the design of the ultrasonic emission front end, through the control of a single MOS tube, it works in a saturated or cut-off state, and a high-voltage pulse is generated at the output of the MOS tube, which can drive the transducer to generate ultrasonic waves. However, in the above case, the efficiency of the MOS tube is not high, and the lifetime of the MOS tube will be affected. For users, there is a need for a more convenient, simple, efficient, and long-term effective method for driving piezoelectric crystals to generate ultrasonic waves.

In addition, the selection of ultrasonic frequency is an important link in ultrasonic testing. For a specific detection area, if the ultrasonic frequency is too high, the penetration will not be deep; if the frequency is too low, there will be no corresponding biological effect. Because different tissues have different structures and densities, ultrasonic waves of different frequencies have different imaging quality on the above-mentioned tissues. Therefore, in specific cases, it is necessary to use ultrasonic waves of different frequencies to detect them according to the actual tissue to be tested to obtain the best diagnostic results.

Ultrasonic detection equipment on the market usually uses an ultrasonic instrument with a certain fixed frequency. In some specific occasions and specific organizations, using an ultrasonic detection instrument of the corresponding frequency will obtain the best quality ultrasonic detection image. In order to improve the reusability of equipment, a method that can generate ultrasonic waves with variable frequency is needed, so as to reduce costs and improve equipment utilization.

Contents of the invention

The present invention aims to solve the existing problems in the prior art, and provides an ultrasonic emission drive device with adjustable frequency.

The technical solution of the present invention includes an ultrasonic emission drive device with adjustable frequency, including an ultrasonic transmitter, a pulse high-voltage generator, a multi-frequency pulse generation signal control module, and a power supply module. The multi-frequency pulse generation signal control module is used for Generate multi-frequency low-voltage pulse signals; the pulse high-voltage generator receives the multi-frequency low-voltage pulse signals and outputs high-voltage pulse signals; the ultrasonic transmitter receives the high-voltage pulse signals and emits ultrasonic waves; the power module is used for the The driving device is powered; wherein, the pulse high-voltage generator includes a high-voltage pulse output terminal composed of a P-type MOS tube and an N-type MOS tube, and the P-type MOS tube and the N-type MOS tube are connected to a Class B working state, alternately Work. `

Preferably, the pulsed high-voltage generator also includes a two-stage differential amplifier, a power MOSFET, a voltage-stabilizing shunt circuit, and a CLAMP circuit, and the multi-frequency low-voltage pulse signal passes through the two-stage differential amplifier, power MOSFET, and a voltage-stabilizing shunt circuit in sequence. Enter the high-voltage pulse output terminal, generate a high-voltage pulse signal and send it to the ultrasonic transmitter; the CLAMP circuit is connected to the high-voltage pulse output terminal; the voltage-stabilizing shunt circuit and the CLAMP circuit are connected to different ends of the high-voltage pulse output terminal .

Preferably, the multi-frequency pulse generation signal control module includes a low-frequency pulse signal circuit, a multi-frequency high-frequency pulse signal circuit, and a switch output terminal; the switch output terminal receives the low-frequency pulse signal circuit, multi-frequency high-frequency pulse The pulse signal of the signal circuit is controlled to output a multi-frequency low-voltage pulse signal.

Preferably, the low-frequency pulse signal circuit includes a PI-shaped circuit composed of capacitors and inductors, and the low-frequency pulse signal is generated through an inverter, and the inverter is electrically connected to the switch output terminal.

Preferably, the multi-frequency high-frequency pulse signal circuit includes a crystal oscillator and an FPGA connected to the crystal oscillator to generate a multi-frequency high-frequency pulse signal, and the FPGA is electrically connected to the switch output terminal.

Preferably, the inverter uses a 74HC132D chip.

Preferably, the power supply module includes four inputs of ±12V and ±80V, wherein the ±80V is used for power supply of the pulse high voltage generator, the +12V is used for power supply of digital circuits and analog circuits, and the -12V Used to power digital circuits.

Preferably, the +12V outputs 3.3V power through the first voltage conversion chip, the +12V outputs 5V power through the second voltage conversion chip, and the -12V outputs -5V power through the third voltage conversion chip.

Preferably, the 5V outputs 1.2V, 2.5V, and 3.3V power supplies through the fourth voltage conversion chip, the fifth voltage conversion chip, and the sixth voltage conversion chip, respectively.

Preferably, the first voltage conversion chip is HT7533, the second voltage conversion chip is LM2676, the third voltage conversion chip is LM7905, the fourth voltage conversion chip is TPS73201, and the fifth voltage conversion chip is TPS73225, and the sixth voltage conversion chip is TPS73233.

The beneficial effects of the invention include: improving the circuit using a single MOS tube as an output stage, improving the performance of the circuit, and generating ultrasonic waves more effectively; adopting double MOS tubes is beneficial to the service life of the MOS tubes.

Description of drawings

Fig. 1 is a structural diagram of a pulsed high voltage generator according to an embodiment of the present invention.

Fig. 2 is a structural diagram of a multi-frequency pulse generation signal control module according to an embodiment of the present invention.

FIG. 3 is a structural diagram of a power module according to an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

The present invention presents different imaging qualities for different organs and tissues sensitive to ultrasound of different frequencies through the control of the pulsed high-voltage generator, realizes the emission of pulses of different frequencies, excites piezoelectric crystals with different frequency parameters, and generates ultrasound waves of different frequencies , so that ultrasonic waves of different frequencies can be excited.

An embodiment of the present invention provides an ultrasonic transmitting drive device with adjustable frequency, which includes an ultrasonic transmitter, a pulse high voltage generator, a multi-frequency pulse generating signal control module, and a power supply module.

The multi-frequency pulse generation signal control module is used to generate multi-frequency low-voltage pulse signals; the pulse high-voltage generator receives multi-frequency low-voltage pulse signals and outputs high-voltage pulse signals; the ultrasonic transmitter receives high-voltage pulse signals and emits ultrasonic waves; the power module is used to drive The device is powered.

Among them, the pulse high-voltage generator includes a high-voltage pulse output end composed of P-type MOS tubes and N-type MOS tubes, and the P-type MOS tubes and N-type MOS tubes are connected in a class B working state and work alternately.

The invention improves the circuit using a single MOS tube as an output stage, improves the performance of the circuit, and can generate ultrasonic waves more effectively; adopting double MOS tubes is beneficial to the service life of the MOS tubes.

As shown in Figure 1, the pulse high voltage generator also includes a secondary differential amplifier, a power MOSFET, a voltage stabilizing shunt circuit, and a CLAMP circuit. The output end generates a high-voltage pulse signal and transmits it to the ultrasonic transmitter; the CLAMP circuit is connected to the high-voltage pulse output end; the voltage-stabilizing shunt circuit and the CLAMP circuit are connected to different ends of the high-voltage pulse output end.

Among them, the MOSFET adopts IRF520N, and the voltage stabilizing shunt circuit adopts P6KE62C.

As shown in Figure 2, the multi-frequency pulse generation signal control module includes a low-frequency pulse signal circuit, a multi-frequency high-frequency pulse signal circuit, and a switch output terminal; the switch output terminal receives the low-frequency pulse signal circuit and the multi-frequency high-frequency pulse signal circuit. Pulse signal and control the output of multi-frequency low-voltage pulse signal.

The low-frequency pulse signal circuit includes a PI-shaped circuit composed of a capacitor and an inductance, and generates a low-frequency pulse signal through an inverter, and the inverter is electrically connected to the switch output end.

The multi-frequency high-frequency pulse signal circuit includes a crystal oscillator and an FPGA (Field-Programmable Gate Array, Field Programmable Gate Array) connected to the crystal oscillator to generate a multi-frequency high-frequency pulse signal, and the FPGA is electrically connected to the switch output terminal to realize precise control and The stable output of the pulse is controlled by the multi-frequency pulse generation signal control module to the pulse high voltage generator. Among them, the crystal oscillator adopts a high-precision crystal oscillator.

The FPGA controls the switch and selects the frequency of the output signal, generates a pulse waveform of 0-40MHz, and excites transducers of different frequencies, which can meet the needs of medical diagnosis for ultrasonic waves of various frequencies.

Preferably, the inverter uses a 74HC132D chip.

As shown in Figure 3, the power module includes four inputs of ±12V and ±80V, of which ±80V is used for power supply of pulse high voltage generator, +12V is used for power supply of digital circuit and analog circuit, and -12V is used for power supply of digital circuit.

+12V outputs 3.3V power through the first voltage conversion chip, +12V outputs 5V power through the second voltage conversion chip, and -12V outputs -5V power through the third voltage conversion chip.

The 5V outputs 1.2V, 2.5V, and 3.3V power supplies respectively through the fourth voltage conversion chip, the fifth voltage conversion chip, and the sixth voltage conversion chip.

The first voltage conversion chip is HT7533, the second voltage conversion chip is LM2676, the third voltage conversion chip is LM7905, the fourth voltage conversion chip is TPS73201, the fifth voltage conversion chip is TPS73225, and the sixth voltage conversion chip is TPS73233.

The invention uses a single MOS tube as an output stage circuit to improve the performance of the circuit and can generate ultrasonic waves more effectively; the FPGA chip is used to control the pulse generator to accurately generate high-voltage pulses. At the front end of ultrasonic generation that realizes variable frequency from low frequency to high frequency, corresponding codes are written for different ultrasonic detection areas to generate ultrasonic waves of different frequencies, so as to realize the repeated use of equipment and reduce costs.

The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and modifications made according to the technical concept of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (10)

1. the adjustable ultrasonic wave transmitting drive unit of frequency, is characterized in that, comprises ultrasonic transmitter, pulsed high-voltage generator, multi-frequency pulse generating signal control module, power module,

Described multi-frequency pulse generating signal control module, for generation of multi-frequency low voltage pulse signal;

Described pulsed high-voltage generator, receives described multi-frequency low voltage pulse signal and exports high-voltage pulse signal;

Described ultrasonic transmitter receives described high-voltage pulse signal and launches ultrasonic wave;

Described power module is for described drive unit power supply;

Wherein, described pulsed high-voltage generator comprises the high-voltage pulse output being comprised of P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor, and described P type metal-oxide-semiconductor and N-type metal-oxide-semiconductor connect into Class B operating state, alternation.

2. ultrasonic wave transmitting drive unit as claimed in claim 1, it is characterized in that, described pulsed high-voltage generator also comprises secondary differential amplifier, power MOSFET, voltage stabilizing shunt circuit and CLAMP circuit, described multi-frequency low voltage pulse signal enters described high-voltage pulse output through described secondary differential amplifier, power MOSFET, voltage stabilizing shunt circuit successively, generates high-voltage pulse signal and is sent to described ultrasonic transmitter; Described CLAMP circuit is connected with described high-voltage pulse output; Described voltage stabilizing shunt circuit is connected from the different ends of high-voltage pulse output with CLAMP circuit.

3. ultrasonic wave transmitting drive unit as claimed in claim 1, is characterized in that, described multi-frequency pulse generating signal control module comprises low frequency pulse signal circuit, multifrequency high-frequency pulse signal circuit, output switching terminal; Described output switching terminal receives the pulse signal of described low frequency pulse signal circuit, multifrequency high-frequency pulse signal circuit and controls output multi-frequency low voltage pulse signal.

4. ultrasonic wave transmitting drive unit as claimed in claim 3, it is characterized in that, described low frequency pulse signal circuit comprises the PI shape circuit of electric capacity and inductance composition and through inverter generation low frequency pulse signal, described inverter is electrically connected with described output switching terminal.

5. ultrasonic wave transmitting drive unit as claimed in claim 3, it is characterized in that, the FPGA generation multifrequency high-frequency pulse signal that described multifrequency high-frequency pulse signal circuit comprises crystal oscillator and is connected with described crystal oscillator, described FPGA is electrically connected with described output switching terminal.

6. ultrasonic wave transmitting drive unit as claimed in claim 4, is characterized in that, described inverter adopts 74HC132D chip.

7. ultrasonic wave transmitting drive unit as claimed in claim 1, it is characterized in that, comprise ± 12V of described power module and ± 80VSi road input, wherein, described ± 80V is for described pulsed high-voltage generator power supply, described+12V is for digital circuit and analog circuit power supply, and described-12V is for digital circuit power supply.

8. ultrasonic wave transmitting drive unit as claimed in claim 7, it is characterized in that, described+12V is through the first voltage transitions chip output 3.3V power supply, and described+12V is through second voltage conversion chip output 5V power supply, and described-12V is through tertiary voltage conversion chip output-5V power supply.

9. ultrasonic wave transmitting drive unit as claimed in claim 8, is characterized in that, described 5V exports respectively 1.2V, 2.5V, 3.3V power supply through the 4th voltage transitions chip, the 5th voltage transitions chip, the 6th voltage transitions chip.

10. ultrasonic wave transmitting drive unit as claimed in claim 9, it is characterized in that, described the first voltage transitions chip is HT7533, described second voltage conversion chip is LM2676, described tertiary voltage conversion chip is LM7905, described the 4th voltage transitions chip is TPS73201, and described the 5th voltage transitions chip is TPS73225, and described the 6th voltage transitions chip is TPS73233.

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