Transducer excitation circuit for ultrasonic icing detection

Abstract

The invention belongs to the technical field of electronic circuits, and relates to a transducer excitation circuit for ultrasonic icing detection. The method is mainly used for excitation of the ultrasonic transducer. The circuit realizes a periodic sharp pulse excitation signal with a controllable emission period as shown in the figure. The high-voltage pulse amplitude of the excitation signal is greater than or equal to 300V; the width of a pulse falling edge is less than or equal to 20ns, and excitation signal emission can be controlled through 3.3 V square waves. And the penetrating capability, the detection capability and the anti-interference capability of ultrasonic signals can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to a transducer excitation circuit for ultrasonic ice detection. Background Art

[0002] Ultrasonic waves are widely used in various detection systems due to their good penetration and directionality, such as ultrasonic flaw detection, B-ultrasound, ultrasonic ranging, etc. Compared with traditional ultrasonic detection, the application scenarios of ultrasonic aircraft ice detection are more complex, the detected ice conditions are more variable, and the ultrasonic penetration requirements are higher. The pulse width and amplitude of the high-voltage narrow pulse signal generated by the transducer excitation circuit will directly affect the core detection capability of the ultrasonic ice detector, so it is necessary to develop a transducer excitation circuit that can be used for ultrasonic ice detection. Summary of the invention

[0003] The object of the present invention is to provide a controllable transducer excitation circuit for ultrasonic ice detection.

[0004] The technical solution of the present invention is:

[0005] Provided is a transducer excitation circuit for ultrasonic ice detection, the transducer excitation circuit comprising capacitors C1-C4, resistors R1-R7, avalanche transistors Q1-Q3, and pin headers J1-J3;

[0006] Pin 2 of pin header J1 is connected to the power input, pin 1 of pin header J1, pin 1 of pin header J2 and pin 2 of pin header J3 are all grounded, one end of resistor R2, one end of resistor R3 and one end of resistor R5 are connected in parallel to pin 2 of pin header J2.

[0007] The other end of the resistor R2 is connected to the pin 1 of the avalanche transistor Q1, and the other end of the resistor R2, the capacitor C2, and the pin 2 of the avalanche transistor Q2 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q2 are connected, and the pin 3 of the avalanche transistor Q2 is connected in series with the resistor R4 and then grounded;

[0008] The 2nd foot of the avalanche transistor Q1 is connected in series with the capacitor C1 and then connected to the 2nd foot of the pin header J2; the 2nd foot of the avalanche transistor Q1 is connected in series with the resistor R1 and then grounded;

[0009] The other end of the resistor R3 is connected to the pin 1 of the avalanche transistor Q3, and the other end of the resistor R3, the capacitor C3, and the pin 2 of the avalanche transistor Q3 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q3 are connected, and the pin 3 of the avalanche transistor Q3 is connected in series with the resistor R6 and then grounded;

[0010] The other end of the resistor R5, the capacitor C3, and the pin 1 of the pin header J3 are connected in series; the pin 1 of the pin header J3 is connected in series with the resistor R7 and then grounded.

[0011] Furthermore, the capacitors C1 to C4 are 1 nF.

[0012] Further, the resistor R1 is 4.7Ω, further, the resistors R2, R3 and R5 are 470kΩ, the resistors R4 and R6 are 10kΩ, and the resistor R7 is 470Ω.

[0013] Furthermore, the avalanche transistors Q1-Q3 are of model JBC847.

[0014] Furthermore, the power supply is a 300V voltage source.

[0015] Furthermore, the transducer excitation circuit uses the DC / DC module ZHDC28S300 as a voltage source to supply 300V of high voltage power with a power of 6W, and has a small ripple coefficient, resulting in low circuit noise.

[0016] Furthermore, the transducer excitation circuit generates a pulsed Gaussian signal by avalanche-triggered conduction of avalanche transistor JBC847.

[0017] Furthermore, the transducer excitation circuit selects a 470Ω resistor R7 as the transducer matching impedance.

[0018] Furthermore, the square wave control circuit is based on the GH5231 high-speed optocoupler as the core chip, and its rise time is 20ns.

[0019] The advantages and beneficial effects of the present invention are as follows: the present invention is characterized in that the Marx pulse circuit of the avalanche transistor is used, and the reverse current inside the transistor is rapidly increased through the avalanche effect, thereby greatly reducing the high-voltage pulse triggering time. The circuit realizes the adjustable high-voltage narrow pulse generated by the 3.3V square wave signal. The excitation pulse voltage amplitude generated by the present invention can reach 300V, and the pulse width can reach 20ns. It can greatly improve the penetration ability, detection ability and anti-interference ability of ultrasonic signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the schematic diagram of the excitation circuit. DETAILED DESCRIPTION

[0021] The disclosed examples will be more fully described with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples may be described and these examples should not be construed as limited to the examples set forth herein. Instead, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those skilled in the art.

[0022] Provided is a transducer excitation circuit for ultrasonic ice detection, the transducer excitation circuit comprising capacitors C1-C4, resistors R1-R7, avalanche transistors Q1-Q3, and pin headers J1-J3;

[0023] Pin 2 of pin header J1 is connected to the power input, pin 1 of pin header J1, pin 1 of pin header J2 and pin 2 of pin header J3 are all grounded, one end of resistor R2, one end of resistor R3 and one end of resistor R5 are connected in parallel to pin 2 of pin header J2.

[0024] The other end of the resistor R2 is connected to the pin 1 of the avalanche transistor Q1, and the other end of the resistor R2, the capacitor C2, and the pin 2 of the avalanche transistor Q2 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q2 are connected, and the pin 3 of the avalanche transistor Q2 is connected in series with the resistor R4 and then grounded;

[0025] The 2nd foot of the avalanche transistor Q1 is connected in series with the capacitor C1 and then connected to the 2nd foot of the pin header J2; the 2nd foot of the avalanche transistor Q1 is connected in series with the resistor R1 and then grounded;

[0026] The other end of the resistor R3 is connected to the pin 1 of the avalanche transistor Q3, and the other end of the resistor R3, the capacitor C3, and the pin 2 of the avalanche transistor Q3 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q3 are connected, and the pin 3 of the avalanche transistor Q3 is connected in series with the resistor R6 and then grounded;

[0027] The other end of the resistor R5, the capacitor C3, and the pin 1 of the pin header J3 are connected in series; the pin 1 of the pin header J3 is connected in series with the resistor R7 and then grounded.

[0028] Capacitors C1 to C4 are 1nF.

[0029] The resistor R1 is 4.7Ω, further, the resistors R2, R3 and R5 are 470kΩ, the resistors R4 and R6 are 10kΩ, and the resistor R7 is 470Ω.

[0030] The avalanche transistors Q1-Q3 are of model JBC847.

[0031] The power supply is a 300V voltage source.

[0032] The transducer excitation circuit uses the DC / DC module ZHDC28S300 as a voltage source to supply 300V of high voltage, with a power of 6W, and has a small ripple coefficient, resulting in low circuit noise.

[0033] The transducer excitation circuit generates a pulse Gaussian signal by avalanche triode JBC847 through avalanche triggering conduction.

[0034] The transducer excitation circuit uses a 470Ω resistor R7 as the transducer matching impedance.

[0035] The description of different advantageous arrangements has been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages over other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure with various examples with various modifications suitable for the particular use contemplated.

Claims

1. A transducer excitation circuit for ultrasonic ice detection, characterized in that: The transducer excitation circuit includes capacitors C1-C4, resistors R1-R7, avalanche transistors Q1-Q3, and pin headers J1-J3; Pin 2 of pin header J1 is connected to the power input, pin 1 of pin header J1, pin 1 of pin header J2 and pin 2 of pin header J3 are all grounded, one end of resistor R2, one end of resistor R3 and one end of resistor R5 are connected in parallel to pin 2 of pin header J2. The other end of the resistor R2 is connected to the pin 1 of the avalanche transistor Q1, and the other end of the resistor R2, the capacitor C2, and the pin 2 of the avalanche transistor Q2 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q2 are connected, and the pin 3 of the avalanche transistor Q2 is connected in series with the resistor R4 and then grounded; The 2nd foot of the avalanche transistor Q1 is connected in series with the capacitor C1 and then connected to the 2nd foot of the pin header J2; the 2nd foot of the avalanche transistor Q1 is connected in series with the resistor R1 and then grounded; The other end of the resistor R3 is connected to the pin 1 of the avalanche transistor Q3, and the other end of the resistor R3, the capacitor C3, and the pin 2 of the avalanche transistor Q3 are connected in series; the pin 2 and the pin 3 of the avalanche transistor Q3 are connected, and the pin 3 of the avalanche transistor Q3 is connected in series with the resistor R6 and then grounded; The other end of the resistor R5, the capacitor C3, and the pin 1 of the pin header J3 are connected in series; the pin 1 of the pin header J3 is connected in series with the resistor R7 and then grounded.

2. A transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: Capacitors C1~C4 are 1nF.

3. The transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The resistor R1 is 4.7Ω, the resistors R2, R3 and R5 are 470kΩ, the resistors R4 and R6 are 10kΩ, and the resistor R7 is 470Ω.

4. The transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The avalanche transistors Q1-Q3 are of model JBC847.

5. The transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The power supply is a 300V voltage source.

6. A transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The transducer excitation circuit uses the DC / DC module ZHDC28S300 as a voltage source to supply a high voltage of 300V with a power of 6W.

7. A transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The transducer excitation circuit generates a pulse Gaussian signal through avalanche triggering conduction of avalanche triode JBC847.

8. The transducer excitation circuit for ultrasonic ice detection according to claim 1, characterized in that: The resistor R7 is the transducer matching impedance.

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