A performance parameter monitoring device for an electrostatic ultrasonic transducer

Abstract

The utility model discloses a kind of performance parameter monitoring devices of electrostatic ultrasonic transducer, including current monitoring module, voltage monitoring module and signal processing module, signal processing module is connected with current monitoring module and voltage monitoring module, for obtaining the actual power of electrostatic ultrasonic transducer according to the current signal monitored by current monitoring module and the voltage signal monitored by voltage monitoring module, according to the actual power to adjust the voltage and / or current gain of electrostatic ultrasonic transducer, and then adjust actual power.The utility model is monitored to the current and voltage parameter of electrostatic ultrasonic transducer, realizes to adjust the power of electrostatic ultrasonic transducer.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic ultrasonic transducer technology, and specifically to a performance parameter monitoring device for an electrostatic ultrasonic transducer. Background Technology

[0002] Electrostatic ultrasonic transducers are capacitive loads. Their core working principle is based on capacitive sensing or electrostatic conversion, requiring a matching circuit to adjust the load characteristics and ensure energy conversion efficiency.

[0003] However, electrostatic ultrasonic transducers of different sizes and manufactured using different processes will have varying capacitance and impedance values, and the LCR (inductance L, capacitance C, and resistance R) parameters of electrostatic ultrasonic transducers will also vary considerably under different temperatures and humidity conditions. This results in different actual power outputs for electrostatic ultrasonic transducers even at the same amplifier gain, and power is positively correlated with frequency response.

[0004] Therefore, to maintain a constant frequency response of the electrostatic ultrasonic transducer, its actual power must also remain constant. Thus, it is necessary to monitor the power at the load end of the electrostatic ultrasonic transducer in real time to maintain a constant power output. Utility Model Content

[0005] The purpose of this invention is to provide a device for monitoring the performance parameters of an electrostatic ultrasonic transducer.

[0006] To achieve the above objectives, this utility model proposes a performance parameter monitoring device for an electrostatic ultrasonic transducer, comprising:

[0007] A current monitoring module is connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer to monitor the current signal input to the electrostatic ultrasonic transducer.

[0008] A voltage monitoring module is also connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer, and is used to monitor the voltage signal input to the electrostatic ultrasonic transducer.

[0009] The signal processing module is connected to the output terminals of both the current monitoring module and the voltage monitoring module. It is used to obtain the actual power of the electrostatic ultrasonic transducer based on the current signal and the voltage signal, and to adjust the voltage and / or current gain of the electrostatic ultrasonic transducer based on the actual power, thereby adjusting the actual power.

[0010] In a preferred embodiment, the current monitoring module is a Hall current sensor.

[0011] In a preferred embodiment, the current monitoring module is a Hall current sensor of model ACS712ELCTR.

[0012] In a preferred embodiment, the positive input pin of the Hall current sensor is connected to the output terminal of the driving circuit, the negative input pin is connected to the input terminal of the electrostatic ultrasonic transducer, and the output pin is connected to the first ADC interface of the signal processing module.

[0013] In a preferred embodiment, the input terminal of the voltage monitoring module is connected between the negative input pin of the Hall current sensor and the input terminal of the electrostatic ultrasonic transducer, and the output terminal is connected to the second ADC interface of the signal processing module.

[0014] In a preferred embodiment, the voltage monitoring module includes a first voltage divider circuit and a second voltage divider circuit. One end of the first voltage divider circuit is connected between the negative input pin of the Hall current sensor and the input terminal of the electrostatic ultrasonic transducer, and the other end is connected to one end of the second voltage divider circuit. The other end of the second voltage divider circuit is connected to the second ADC interface of the signal processing module.

[0015] In a preferred embodiment, the first voltage divider circuit includes a first DC blocking capacitor, a first voltage dividing resistor, and a second voltage dividing resistor. One end of the first DC blocking capacitor is connected between the negative input pin of the Hall current sensor and the electrostatic ultrasonic transducer, and the other end is connected to one end of the first voltage dividing resistor. The other end of the first voltage dividing resistor is connected to one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded. The voltage signal after voltage division is output from the node between the first voltage dividing resistor and the second voltage dividing resistor.

[0016] In a preferred embodiment, the second voltage divider circuit includes a second DC blocking capacitor, a third voltage dividing resistor, a fourth voltage dividing resistor, a fifth voltage dividing resistor, and a sixth voltage dividing resistor. One end of the second DC blocking capacitor is connected between the first and second voltage dividing resistors, and the other end is connected between the third and fourth voltage dividing resistors. One end of the third voltage dividing resistor is connected to a power supply, and the other end is connected to one end of the fourth voltage dividing resistor. One end of the fifth voltage dividing resistor is connected between the third and fourth voltage dividing resistors, and the other end is connected to one end of the sixth voltage dividing resistor. Both of these are connected to the second ADC interface of the signal processing module. The other end of the fourth voltage dividing resistor and the other end of the sixth voltage dividing resistor are both grounded.

[0017] In a preferred embodiment, the signal processing module is a microcontroller of model APM32E103CET6.

[0018] In a preferred embodiment, the first DC blocking capacitor has a value of 0.1UF to 0.2UF / 500V, the first voltage divider resistor has a value of 100KΩ to 110KΩ, the second voltage divider resistor has a value of 1.65KΩ to 1.66KΩ, the second DC blocking capacitor has a value of 2.2UF to 2.3UF / 50V, the third voltage divider resistor has a value of 8KΩ to 10KΩ, the fourth voltage divider resistor has a value of 10KΩ to 12KΩ, the fifth voltage divider resistor has a value of 90Ω to 100Ω, and the sixth voltage divider resistor has a value of 1MΩ to 2MΩ.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention monitors the current and voltage parameters of an electrostatic ultrasonic transducer, obtains the actual power of the transducer from these two parameters, and adjusts the power amplifier gain of the transducer based on the actual power to maintain its power and thus its frequency response. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structural block of the performance parameter monitoring device for the electrostatic ultrasonic transducer of this utility model;

[0022] Figure 2 This is a schematic diagram of the performance parameter monitoring device for an electrostatic ultrasonic transducer in a specific embodiment. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0024] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0025] like Figure 1 As shown, the present invention discloses a performance parameter monitoring device for an electrostatic ultrasonic transducer, comprising a current monitoring module, a voltage monitoring module, and a signal processing module. The current monitoring module and the voltage monitoring module monitor the current signal and voltage signal of the electrostatic ultrasonic transducer, respectively. The signal processing module obtains the actual power of the electrostatic ultrasonic transducer based on these two signals and then adjusts the actual power.

[0026] Specifically, the current monitoring module is connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer to monitor the current signal input to the electrostatic ultrasonic transducer. In implementation, a Hall current sensor, model ACS712ELCTR, is preferably used for the current monitoring module. Specifically, in conjunction with... Figure 2 As shown, the two positive input pins of the Hall current sensor (IP1+ and IP2+ pins) are connected to the output of the drive circuit, and the output pin (OUT pin) is connected to the first ADC interface (ADC1 interface) of the signal processing module. The negative input pins of the Hall current sensor (IP1- and IP2- pins) are connected to the input of the electrostatic ultrasonic transducer.

[0027] The voltage monitoring module is also connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer to monitor the voltage signal input to the electrostatic ultrasonic transducer. In implementation, the input terminal of the voltage monitoring module is connected between the negative input pins of the Hall current sensor (i.e., IP1-pin and IP2-pin) and the input terminal of the electrostatic ultrasonic transducer, and the output terminal is connected to the second ADC interface (i.e., ADC2 interface) of the signal processing module. Specifically, the voltage monitoring module includes a first voltage divider circuit and a second voltage divider circuit. One end of the first voltage divider circuit is connected between the negative input pin of the Hall current sensor and the input terminal of the electrostatic ultrasonic transducer, and the other end is connected to one end of the second voltage divider circuit. The other end of the second voltage divider circuit is connected to the second ADC interface of the signal processing module.

[0028] In one specific embodiment, the first voltage divider circuit specifically includes a first DC blocking capacitor C1, a first voltage dividing resistor R1, and a second voltage dividing resistor R2. One end of the first DC blocking capacitor C1 is connected between the negative input pin (i.e., IP1-pin and IP2-pin) of the Hall current sensor and the electrostatic ultrasonic transducer, and the other end is connected to one end of the first voltage dividing resistor R1. The other end of the first voltage dividing resistor R1 is connected to one end of the second voltage dividing resistor R2, and the other end of the second voltage dividing resistor R2 is grounded (GND). The voltage signal after voltage division is output from the node between the first voltage dividing resistor R1 and the second voltage dividing resistor R2. The second voltage divider circuit specifically includes a second DC blocking capacitor C1, a third voltage dividing resistor R3, a fourth voltage dividing resistor R4, a fifth voltage dividing resistor R5, and a sixth voltage dividing resistor R6. One end of the second DC blocking capacitor C1 is connected between the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the other end is connected between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4. One end of the third voltage dividing resistor R3 is connected to the power supply, and the other end is connected to one end of the fourth voltage dividing resistor R4. One end of the fifth voltage dividing resistor R5 is connected between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4, and the other end is connected to one end of the sixth voltage dividing resistor R6. Both of these are connected to the second ADC interface of the signal processing module. The other ends of the fourth voltage dividing resistor R4 and the sixth voltage dividing resistor R6 are both grounded. In implementation, the first DC blocking capacitor C1 can be 0.1UF to 0.2UF / 500V, such as 0.1UF / 500V; the first voltage divider resistor R1 can be 100KΩ to 110KΩ, such as 100KΩ; the second voltage divider resistor R2 can be 1.65KΩ to 1.66KΩ, such as 1.65KΩ; the second DC blocking capacitor C2 can be 2.2UF to 2.3UF / 50V, such as 2.2UF / 50V; the third voltage divider resistor R3 can be 8KΩ to 10KΩ, such as 10KΩ; the fourth voltage divider resistor R4 can be 10KΩ to 12KΩ, such as 10KΩ; the fifth voltage divider resistor R5 can be 90Ω to 100Ω, such as 100Ω; and the sixth voltage divider resistor R6 can be 1MΩ to 2MΩ, such as 1MΩ.

[0029] The signal processing module is connected to the outputs of both the current monitoring module and the voltage monitoring module. Specifically, its first ADC interface (ADC1 interface) is connected to the output pin (OUT pin) of the current monitoring module, and its second ADC interface (ADC2 interface) is connected to the output of the voltage monitoring module. This module is used to obtain the actual power of the electrostatic ultrasonic transducer based on the current and voltage signals, and then adjust the voltage and / or current gain of the electrostatic ultrasonic transducer according to the actual power, thereby adjusting the actual power to match the preset power. In implementation, the signal processing module can specifically use a microcontroller of model APM32E103CET6. The principle of obtaining power from the current and voltage signals and the principle of adjusting the voltage and / or current gain can be found in existing technology; this part is not an innovation of this utility model and will not be elaborated upon. The main innovation of this utility model lies in using the current monitoring module and voltage monitoring module to monitor the current and voltage signals of the electrostatic ultrasonic transducer in real time, and then obtaining the power based on the relationship between current, voltage, and power, thereby realizing the power adjustment of the electrostatic ultrasonic transducer. This does not involve any improvement to the signal processing module itself.

[0030] In addition to adjusting the power of the electrostatic ultrasonic transducer based on current and voltage parameters, this invention can also use these parameters to determine whether the electrostatic ultrasonic transducer is damaged, thus indicating whether it needs to be replaced.

[0031] The advantage of this invention is that it monitors the current and voltage parameters of the electrostatic ultrasonic transducer, obtains the actual power of the electrostatic ultrasonic transducer through these two parameters, and adjusts the power amplifier gain of the electrostatic ultrasonic transducer according to the actual power, thereby maintaining its power and thus its frequency response.

[0032] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A performance parameter monitoring device for an electrostatic ultrasonic transducer, characterized in that, The device includes: A current monitoring module is connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer to monitor the current signal input to the electrostatic ultrasonic transducer. A voltage monitoring module is also connected between the drive circuit of the electrostatic ultrasonic transducer and the electrostatic ultrasonic transducer, and is used to monitor the voltage signal input to the electrostatic ultrasonic transducer. The signal processing module is connected to the output terminals of both the current monitoring module and the voltage monitoring module. It is used to obtain the actual power of the electrostatic ultrasonic transducer based on the current signal and the voltage signal, and to adjust the voltage and / or current gain of the electrostatic ultrasonic transducer based on the actual power, thereby adjusting the actual power.

2. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 1, characterized in that, The current monitoring module is a Hall current sensor.

3. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 2, characterized in that, The current monitoring module is an ACS712ELCTR Hall current sensor.

4. A performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 2 or 3, characterized in that, The positive input pin of the Hall current sensor is connected to the output terminal of the driving circuit, the negative input pin is connected to the input terminal of the electrostatic ultrasonic transducer, and the output pin is connected to the first ADC interface of the signal processing module.

5. A performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 2 or 3, characterized in that, The input terminal of the voltage monitoring module is connected between the negative input pin of the Hall current sensor and the input terminal of the electrostatic ultrasonic transducer, and the output terminal is connected to the second ADC interface of the signal processing module.

6. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 5, characterized in that, The voltage monitoring module includes a first voltage divider circuit and a second voltage divider circuit. One end of the first voltage divider circuit is connected between the negative input pin of the Hall current sensor and the input terminal of the electrostatic ultrasonic transducer, and the other end is connected to one end of the second voltage divider circuit. The other end of the second voltage divider circuit is connected to the second ADC interface of the signal processing module.

7. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 6, characterized in that, The first voltage divider circuit includes a first DC blocking capacitor, a first voltage dividing resistor, and a second voltage dividing resistor. One end of the first DC blocking capacitor is connected between the negative input pin of the Hall current sensor and the electrostatic ultrasonic transducer, and the other end is connected to one end of the first voltage dividing resistor. The other end of the first voltage dividing resistor is connected to one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded. The voltage signal after voltage division is output from the node between the first voltage dividing resistor and the second voltage dividing resistor.

8. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 7, characterized in that, The second voltage divider circuit includes a second DC blocking capacitor, a third voltage dividing resistor, a fourth voltage dividing resistor, a fifth voltage dividing resistor, and a sixth voltage dividing resistor. One end of the second DC blocking capacitor is connected between the first and second voltage dividing resistors, and the other end is connected between the third and fourth voltage dividing resistors. One end of the third voltage dividing resistor is connected to a power supply, and the other end is connected to one end of the fourth voltage dividing resistor. One end of the fifth voltage dividing resistor is connected between the third and fourth voltage dividing resistors, and the other end is connected to one end of the sixth voltage dividing resistor. Both of these are connected to the second ADC interface of the signal processing module. The other end of the fourth voltage dividing resistor and the other end of the sixth voltage dividing resistor are both grounded.

9. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 1, characterized in that, The signal processing module is a microcontroller with model number APM32E103CET6.

10. The performance parameter monitoring device for an electrostatic ultrasonic transducer as described in claim 8, characterized in that, The first DC blocking capacitor has a value of 0.1UF to 0.2UF / 500V, the first voltage divider resistor has a value of 100KΩ to 110KΩ, the second voltage divider resistor has a value of 1.65KΩ to 1.66KΩ, the second DC blocking capacitor has a value of 2.2UF to 2.3UF / 50V, the third voltage divider resistor has a value of 8KΩ to 10KΩ, the fourth voltage divider resistor has a value of 10KΩ to 12KΩ, the fifth voltage divider resistor has a value of 90Ω to 100Ω, and the sixth voltage divider resistor has a value of 1MΩ to 2MΩ.

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