Power amplifier for hydrophone performance testing device

Abstract

The utility model discloses a power amplifier for a hydrophone performance testing device, and belongs to the technical field of hydrophone testing. Comprising a signal input end for receiving the sinusoidal signal, a power amplification circuit for performing power amplification on the sinusoidal signal, and a signal output end for outputting the sinusoidal signal after power amplification; the power amplification circuit comprises a power amplification chip, the signal input end is connected with an in-phase input pin of the power amplification chip, and an output pin of the power amplification chip is connected with the signal output end; an output pin of the power amplifier chip is sequentially connected with a first resistor, a second resistor and the ground in series, and the first resistor and the second resistor are connected with the reverse input end through a wire. The low-level signal processing circuit has the advantages that the low-level signal processing performance is good, and high signal-to-noise ratio precision is kept when weak input signals are processed; and the working voltage range is wide, and the current limit is adjustable.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrophone testing, and in particular relates to a power amplifier used for a hydrophone performance testing device. Background Art

[0002] A hydrophone is a transducer that converts acoustic signals in water into electrical signals. It is an important component in sonar systems. It can monitor noise pollution and bioacoustic signals in oceans and rivers, providing strong support for the protection of aquatic life and their habitats. It can also be used for deep-sea exploration, marine animal behavior research, climate change research, etc.

[0003] Its working principle is based on the characteristics of sound waves propagating in water, including propagation speed, reflection, refraction, etc. When sound waves encounter obstacles or surfaces in the water, they will be reflected back. The hydrophone receives these reflected sound wave signals and converts them into electrical signals to achieve perception and detection of the underwater environment. During the use of hydrophones, there will be problems such as signal interference and noise influence. Therefore, it is necessary to improve the performance of hydrophones to better adapt to various complex underwater environments, which will inevitably involve the performance testing of hydrophones.

[0004] When testing the performance of a hydrophone, it is necessary to amplify the sinusoidal signal to produce sounds at different frequencies for testing. However, the standards of various amplifiers are different. For example, some power amplifiers have a low voltage range or limited amplification capacity, which is not obvious for amplifying weak signals. When a smaller voltage signal, such as 0.96V, is required to be amplified, there will be obvious deficiencies. In addition, different amplification factors are required according to different hydrophones during testing, so the amplification factor of the power amplifier needs to be adjustable.

[0005] In summary, a power amplifier for a hydrophone performance test device is developed to address the above situation. Utility Model Content

[0006] The utility model aims to meet practical needs and provides a power amplifier for a hydrophone performance test device, which has good low-level signal processing performance and a wide operating voltage range.

[0007] In order to achieve the above-mentioned utility model object, the utility model aims to provide a power amplifier for a hydrophone performance test device, which is used to amplify the sinusoidal signal in the hydrophone performance test device, and includes a signal input end for receiving the sinusoidal signal, a power amplifier circuit for power amplifying the sinusoidal signal, and a signal output end for outputting the power-amplified sinusoidal signal; the power amplifier circuit includes a power amplifier chip, the signal input end is connected to the in-phase input pin of the power amplifier chip, and the output pin of the power amplifier chip is connected to the signal output end; the output pin of the power amplifier chip is sequentially connected to a first resistor, a second resistor and ground, and the first resistor and the second resistor are connected to the reverse input end through a wire.

[0008] In the above power amplifier scheme for the hydrophone performance test device, the ratio of the first resistor to the second resistor is 2:1, and the amplification factor of the power amplifier circuit is 3.

[0009] In the above power amplifier solution for the hydrophone performance test device, the reference pin of the power amplifier chip is grounded.

[0010] In the above power amplifier solution for the hydrophone performance test device, the power amplifier chip has a LIM pin, the LIM pin is connected to one end of the capacitor and resistor connected in parallel, and the other end of the capacitor and resistor is connected to the ground.

[0011] In the above power amplifier solution for the hydrophone performance test device, the signal input terminal and the first external port are connected in parallel.

[0012] In the above power amplifier solution for the hydrophone performance test device, the signal output terminal and the second external port are connected in parallel.

[0013] In the above power amplifier scheme for the hydrophone performance test device, the enable / status pin is connected to the test point.

[0014] In the above power amplifier solution for the hydrophone performance test device, capacitors are connected in parallel between the drain power supply and the emitter power supply of the power amplifier chip and the ground.

[0015] In the above power amplifier solution for the hydrophone performance test device, the power amplifier chip adopts the OPA549 chip.

[0016] The advantages and positive effects of this application are:

[0017] (1) The present application has good low-level signal processing performance and can maintain a high signal-to-noise ratio accuracy when processing weak input signals;

[0018] (2) The present application has a wide operating voltage range and an adjustable current limit;

[0019] (3) This application has an overheat protection mechanism, which automatically shuts down the output when the chip temperature exceeds the safety threshold;

[0020] (4) The present application has high conversion efficiency, a slew rate of up to 9V / us, and can produce a higher transient response. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 The circuit diagram of the power amplifier for the hydrophone performance test device provided by the embodiment of the utility model is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0025] All numerical designations, such as pH, temperature, length, flow, including ranges, are approximate. It is to be understood, although not always expressly stated, that all numerical designations are preceded by the term "about".

[0026] For ease of explanation, relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0027] In the description of the invention of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of the utility model can be understood according to specific circumstances.

[0028] First embodiment

[0029] The utility model provides a power amplifier for a hydrophone performance test device, which is used to amplify a sinusoidal signal in the hydrophone performance test device, and includes a signal input end for receiving a sinusoidal signal, a power amplifier circuit for power amplifying the sinusoidal signal, and a signal output end for outputting the sinusoidal signal after power amplification;

[0030] The power amplifier circuit includes a power amplifier chip, the signal input end is connected to the in-phase input pin IN+ of the power amplifier chip, and the output pin VO of the power amplifier chip is connected to the signal output end; the output pin VO of the power amplifier chip is connected in sequence to a first resistor R 11 , the second resistor R 10 In series with ground, the first resistor R 11 and the second resistor R 10 The two terminals are connected to the reverse input terminal IN- through a wire.

[0031] For example, the power amplifier chip may be an OPA549 chip, which is a high-voltage, high-current operational amplifier suitable for driving a variety of loads. It uses laser-trimmed monolithic integrated circuit technology and can provide excellent low-level signal accuracy and high output voltage and current. Figure 1 As shown, the OPA549 chip can be powered by a single power supply or a dual power supply, such as Figure 1 The two V+ and two V- pins are shown in Figure 1.

[0032] Among them, the OPA549 chip can provide a precise and selectable current limit. Specifically, the power amplifier chip has a LIM pin, which is connected to one end of the capacitor and resistor in parallel, and the other end of the capacitor and resistor is connected to the ground; the resistance value of the threshold resistor connected to the LIM pin determines the preset current threshold. When the charging current is greater than the preset current threshold, the chip can quickly lower the output voltage, thereby lowering the output current, thereby limiting the excessive charging current.

[0033] The Enable / Status (E / S) pin is connected to test point TP1 and can be used to determine if the hydrophone performance test fixture is in thermal shutdown.

[0034] The reference pin REF of the power amplifier chip is grounded, providing a path for high-frequency signals to reduce the internal resistance of the power supply; in addition, the capacitor can pass AC and block DC, thereby improving the stability of the power supply voltage.

[0035] Capacitors connected in parallel are provided between the drain power supply, emitter power supply and ground of the power amplifier chip, such as C2 and C5, and C3 and C4 in the figure.

[0036] In addition, the signal input end is connected in parallel with the first external port P3, and the signal output end is connected in parallel with the second external port P5, which can be used to connect other devices for testing.

[0037] Second embodiment

[0038] Based on the above embodiments, the calculation formula of the amplification factor of the power amplifier circuit of the present application is:

[0039]

[0040] Therefore, the amplification factor is adjustable, with a wide operating voltage range, and the current limit is adjustable; illustratively, the ratio of the first resistor to the second resistor is 2:1, then the amplification factor of the power amplifier circuit is 3.

[0041] In addition, the present application also has an overheat protection mechanism, which automatically shuts down the output when the chip temperature exceeds the safety threshold; and has good low-level signal processing performance, and can maintain a high signal-to-noise ratio accuracy when processing weak input signals.

[0042] Based on the above technical solution, it has good low-level signal processing performance and a wide operating voltage range.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A power amplifier for a hydrophone performance test device, used for amplifying a sinusoidal signal in the hydrophone performance test device, characterized in that: It includes a signal input end for receiving a sinusoidal signal, a power amplifier circuit for power amplifying the sinusoidal signal, and a signal output end for outputting the power-amplified sinusoidal signal; the power amplifier circuit includes a power amplifier chip, the signal input end is connected to the in-phase input pin of the power amplifier chip, and the output pin of the power amplifier chip is connected to the signal output end; the output pin of the power amplifier chip is sequentially connected to a first resistor, a second resistor and ground, and the first resistor and the second resistor are connected to the reverse input end through a wire.

2. The power amplifier for the hydrophone performance test device according to claim 1, characterized in that: The ratio of the first resistor to the second resistor is 2:1, and the amplification factor of the power amplifier circuit is 3.

3. The power amplifier for the hydrophone performance test device according to claim 1, characterized in that: The reference pin of the power amplifier chip is grounded.

4. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: The power amplifier chip has a LIM pin, the LIM pin is connected to one end of a capacitor and a resistor connected in parallel, and the other ends of the capacitor and the resistor are connected to the ground.

5. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: The signal input terminal and the first external port are connected in parallel.

6. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: The signal output terminal and the second external port are connected in parallel.

7. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: Enable / status pin connection test point.

8. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: A capacitor connected in parallel is provided between the drain power supply and the emitter power supply of the power amplifier chip and the ground.

9. The power amplifier for a hydrophone performance test device according to claim 1, characterized in that: The power amplifier chip adopts OPA549 chip.

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