CN118138068B - Broadband transducer transmitting modulation circuit and modulation method based on envelope modulation - Google Patents
Broadband transducer transmitting modulation circuit and modulation method based on envelope modulation Download PDFInfo
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- CN118138068B CN118138068B CN202410560292.8A CN202410560292A CN118138068B CN 118138068 B CN118138068 B CN 118138068B CN 202410560292 A CN202410560292 A CN 202410560292A CN 118138068 B CN118138068 B CN 118138068B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/44—Special adaptations for subaqueous use, e.g. for hydrophone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The scheme provides a broadband transducer emission modulation circuit and a modulation method based on envelope modulation, wherein the broadband transducer emission modulation circuit based on envelope modulation is adjusted to be switched between an impedance measurement state and a signal emission state through a first switch and a second switch; when the broadband transducer transmitting modulation circuit based on envelope modulation is in an impedance measurement state, the impedance network analyzer is matched with the main controller to realize the detection of the impedance of the broadband transducer, when the broadband transducer transmitting modulation circuit is in a signal transmission state, the digital potentiometer and the PWM pulse generator modulate the programmable power supply based on control signals, the broadband transducer transmits a modulated envelope signal, and the broadband transmission of a passband is realized by detecting the impedance of the broadband transducer on line and modulating the transmitted envelope signal based on the impedance detected in real time.
Description
Technical Field
The scheme relates to the field of underwater sound electronic application, in particular to a broadband transducer transmitting modulation circuit and a modulation method based on envelope modulation.
Background
The wideband transducer can convert acoustic signals into electrical signals, or vice versa, and the device has wide application in the field of underwater acoustic electronic applications.
In order to protect the electronics in the transducer, it is necessary to control the electrical power while ensuring flatness of the emission envelope within a reasonable safety range when the broadband transducer is applied, and it is also necessary to limit the emitted power when the impedance changes. The conventional practice is that the impedance of the default broadband transducer is always unchanged in the application process, and the design process of the broadband transducer mainly focuses on realizing optimal power matching at a specific center frequency point, and the design ignores the characteristic that the impedance of the broadband transducer can change at different frequencies, so that the performance of the broadband transducer in the whole passband range is not fully considered.
Particularly when the broadband transducer is applied to the field of underwater sound electronics, the underwater sound signal is usually required to be transmitted and received in a wide frequency range, if the design of the broadband transducer only focuses on the power matching of a central frequency point and the impedance is not matched at other frequencies, the transmission loss of the signal at different frequencies is inconsistent, so that the overall frequency response is not uniform, and reflection, attenuation or distortion of the signal occurs in the transmission process; meanwhile, if the signal cannot reach the expected power output in the specific frequency range, the detection, positioning or communication performance of the underwater acoustic signal can be affected.
In summary, the current broadband transducer does not pay attention to the impedance variation characteristics at different frequencies, so that the application of the current broadband transducer in the underwater sound electronic scene is limited.
Disclosure of Invention
The scheme provides a broadband transducer transmitting modulation circuit and a modulation method based on envelope modulation, which realize broadband transmission of a passband by detecting impedance of a broadband transducer on line and modulating a transmitting envelope signal based on the detected impedance in real time.
In order to achieve the above object, the present technical solution provides a wideband transducer transmitting modulation circuit based on envelope modulation, including:
The system comprises a main controller, an impedance network analyzer, a PWM pulse generator, a first switch, a second switch and a digital potentiometer, wherein the impedance network analyzer, the PWM pulse generator, the first switch, the second switch and the digital potentiometer are communicated with the main controller; when the broadband transducer transmitting modulation circuit based on envelope modulation is in an impedance measurement state, the impedance network analyzer is matched with the main controller to realize the detection of the impedance of the broadband transducer, the digital potentiometer and the PWM pulse generator modulate the programmable power supply based on control signals, and the broadband transducer transmits modulated envelope signals.
In a second aspect, the present technical solution provides a modulation method of a wideband transducer emission modulation circuit based on envelope modulation, which modulates the wideband transducer emission modulation circuit based on envelope modulation, including the following steps:
Closing the first switch and conducting the second switch through the main controller so that a transmitting modulation circuit of the broadband transducer based on envelope modulation is in an impedance measurement state;
The impedance network analyzer is adjusted to be coupled with the broadband transducer, and the main controller is used for controlling the impedance network analyzer to generate signals with different frequencies and obtaining voltage coefficients under the signals with different frequencies;
the first switch is turned on and the second switch is turned off through the main controller, so that the broadband transducer transmitting modulation circuit based on envelope modulation is in a signal transmitting state, the programmable power supply is subjected to PWM duty cycle adjustment envelope adjustment based on a voltage coefficient before transmitting signals, the programmable power supply is subjected to PWM duty cycle adjustment when the voltage coefficient is smaller than 1, and the reference voltage Vref of the programmable power supply or the voltage division ratio of the digital potentiometer is adjusted when the voltage coefficient is larger than 1 so as to carry out envelope adjustment.
Compared with the prior art, the technical scheme has the following characteristics and beneficial effects:
1. The scheme simplifies and designs the structure of an impedance analysis network, and is matched with a U/I expansion constant current method to realize the on-line impedance detection of the broadband transducer, the on-line impedance detection is realized by a mode that a main controller acquires the primary voltage and the primary current of a coupling transformer, and the on-line early warning can be made on the abnormal impedance condition of the transducer in a multi-array element system in a multiplexing mode.
2. The scheme controls the emission envelope by PWM duty ratio control or envelope modulation based on the voltage coefficient, and when the voltage coefficient is larger than 1 moment, envelope modulation is carried out on the programmable power supply, namely, the reference voltage of the programmable power supply is adjusted to enable the output of the programmable power supply to track the reference, and through the compensation, the power amplifier can output the compensated envelope signal under the condition of maximum duty ratio output.
Drawings
Fig. 1 is a block diagram of a circuit configuration implementation of a wideband transducer transmit modulation circuit based on envelope modulation.
Fig. 2 is a schematic diagram of a circuit architecture implementation of an impedance network analyzer.
Fig. 3 is a circuit schematic of a digital potentiometer and programmable power supply.
Fig. 4 is a schematic diagram of implementation steps of a modulation method of a wideband transducer transmit modulation circuit based on envelope modulation in the present solution.
In the figure: the power supply comprises a 10-main controller, a 20-impedance network analyzer, a 21-coupling transformer, a 22-DPDT switching relay, a 23-transmitting power amplifier, a 24-signal source, a 251-first gain regulator, a 252-second gain regulator, a 253-third gain regulator, a 26-incident power amplifier, a 30-PWM pulse generator, a 41-first switch, a 42-second switch, a 50-digital potentiometer and a 60-programmable power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
The broadband transducer transmitting modulation circuit based on envelope modulation, which is designed by the scheme, detects the impedance of the broadband transducer on line, controls the transmitting envelope to realize broadband transmission through PWM duty ratio control and envelope modulation, and can be used for on-line detection of the multichannel transducer, and on-line early warning can be carried out on the abnormal impedance of the transducer in a multiplexing mode in a multi-array element system.
Fig. 1 is a circuit structure implementation block diagram of a wideband transducer transmitting modulation circuit based on envelope modulation, which is designed according to the scheme, and the wideband transducer transmitting modulation circuit comprises:
The system comprises a main controller 10, an impedance network analyzer 20, a PWM pulse generator 30, a first switch 41, a second switch 42 and a digital potentiometer 50, wherein the impedance network analyzer 20 is communicated with the main controller 10, the broadband transducer 70 is connected with a programmable power supply 60 through the first switch 41, the broadband transducer 70 is connected with the impedance network analyzer 20 through the second switch 42, and a broadband transducer emission modulation circuit based on envelope modulation is adjusted to switch between an impedance measurement state and a signal emission state through the first switch 41 and the second switch 42; when the broadband transducer emission modulation circuit based on envelope modulation is in an impedance measurement state, the impedance network analyzer 20 cooperates with the main controller 10 to realize detection of the impedance of the broadband transducer 70, and the digital potentiometer 50 and the PWM pulse generator 30 modulate the programmable power supply 60 based on the control signal to cause the broadband transducer 70 to emit a modulated envelope signal.
In the embodiment of the present solution, the main controller 10 controls the second switch 42 to be turned on and the first switch 41 to be turned off so as to switch the wideband transducer transmitting modulation circuit based on envelope modulation to the impedance measurement state, at this time, the impedance network analyzer 20 cooperates with the main controller 10 to realize the detection of the impedance of the wideband transducer 70, in other words, when the impedance measurement needs to be performed on the wideband transducer 70, the second switch 42 is turned on and the first switch 41 is turned off. Correspondingly, the main controller 10 controls the first switch 41 to be turned on and the second switch 42 to be turned off so as to switch the broadband transducer emission modulation circuit based on envelope modulation to a signal emission state, and at the moment, the broadband transducer works to emit an envelope signal.
It should be noted that, when the broadband transducer emission modulation circuit based on envelope modulation is in an impedance measurement state, the main controller 10 of the present embodiment controls the impedance network analyzer 20 to generate signals with different frequencies to couple to the broadband transducer 70, and the main controller 10 is used to collect the voltages and currents of the impedance network analyzer 20 under the signals with different frequencies to realize the impedance measurement of the broadband transducer 70.
In order to save cost and meet the requirement of frequency bands, the design of the impedance network analyzer 20 is simplified under the condition of determining the central frequency impedance of the broadband transducer, and a U/I-expansion constant current method is designed in a matched mode to be matched with the main controller 10 to realize the detection of the impedance of the broadband transducer 70. As shown in fig. 2, fig. 2 is a schematic diagram of an implementation framework of the impedance network analyzer 20 according to the present embodiment, where the impedance network analyzer 20 provided by the present embodiment includes a coupling transformer 21, a wideband transducer 70 and the coupling transformer 21 or a transmitting power amplifier 23 are connected in a switching manner by a dpdt switch 22, an input side of the coupling transformer 21 is connected to a signal source 24 that generates signals with different frequencies, where the signal source 24 obtains a control signal of the main controller 10 to generate signals with different frequencies, and the signals with different frequencies output by the signal source 24 are sequentially input to the coupling transformer 21 after passing through a third gain regulator 253 and an incident power amplifier 26.
When the on-line impedance measurement needs to be performed on the wideband transducer 70, the DPDT switch relay 22 is switched so that the coupling transformer 21 is connected with the secondary of the wideband transducer 70 and disconnected with the transmitting power amplifier 23, the main controller 10 performs a write command on the signal source 24 to generate signals with different frequencies, the signals with different frequencies are coupled to the wideband transducer 70 via the coupling transformer 21, and the main controller 10 is used to collect the primary voltage and primary current of the coupling transformer 21 to obtain the impedance under the signals with different frequencies.
Specifically, one end of the input side of the coupling transformer 21 is grounded, one end branch of the input side of the coupling transformer 21 is grounded and connected to the second gain adjuster 252, the other end of the input side of the coupling transformer 21 is connected to the signal source 24, and one end branch of the input side of the coupling transformer 24 is connected to the first gain adjuster 251. The settings of the first gain adjuster 251, the second gain adjuster 252 and the third gain adjuster 253 of the present solution can be used to adjust the gain level of the input signal at the input side of the coupling transformer 21. More specifically, the gain direction of the third gain adjuster 253 is directed to the input side of the coupling transformer 21 for adjusting the amplification factor of the input signal, and the gain directions of the first gain adjuster 251 and the second gain adjuster 252 are both away from the input side of the coupling transformer 21 for adjusting the amplification factor of the output.
In this embodiment, the first gain adjuster 251 and the second gain adjuster 252 are sensor gain adjustment units, the second gain adjuster 252 is voltage sampling gain adjustment, the first gain adjuster 251 is current sampling gain adjustment, and the third gain adjuster 253 is a variable gain control unit, such as a VCA810 capable of performing voltage controlled output.
In the embodiment of the present solution, the transformation ratio of the coupling transformer 21 is 1:1, and the voltage and current between the primary side and the secondary side of the coupling transformer 21 will be consistent.
The DPDT switch relay 22 of this embodiment has two contact sets, each of which has two actuation electrodes corresponding to two different circuits. Specifically, a set of contact sets of the DPDT switch relay 22 in the present embodiment are respectively connected to the wideband transducer 70 and the transmitting power amplifier 23, and when the set of contact sets is turned on, the wideband transducer 70 and the transmitting power amplifier 23 are turned on; a set of contact sets of the DPDT switch relay 22 are respectively and correspondingly connected to the output ends of the broadband transducer 70 and the coupling transformer 21, and when the set of contact sets are turned on, the broadband transducer 70 and the coupling transformer 21 are turned on, and at this time, on-line measurement of impedance in the impedance variation section at the center frequency of the broadband transducer 70 can be realized.
The operation of the impedance network analyzer 20 is as shown in fig. 2: the main controller 10 generates signals with different frequencies by writing commands to the signal source 24 through the SPI port, and the signals with different frequencies are subjected to gain processing by the third gain regulator 253 and then pass through the incident power amplifier 26 to obtain primary voltage Vs; the position of the first gain regulator 251 on the input side of the coupling transformer 21 outputs a current voltage Vi which is used to reflect the primary current I of the coupling transformer. In an embodiment of the present solution, the signal source 24 may employ an AD9832DDS programmable waveform generator from ADI corporation.
In some embodiments, the primary voltage and primary current of the coupling transformer 21 are automatically acquired using the ADC of the main controller 10 and FFT calculations are performed to achieve impedance and phase angle measurements in the frequency domain of the wideband transducer.
After the impedance under the signals (f 1、f2…fn) with different frequencies is acquired, the applied conductivity (P 1∽Pn) under the signals with different frequencies is calculated based on the impedance under the signals with different frequencies, the voltage coefficient under the signals with different frequencies is calculated based on the applied conductivity, and when the broadband transducer emission modulation circuit based on envelope modulation is in a signal emission state, PWM duty ratio adjustment or envelope adjustment is carried out on the programmable power supply based on the voltage coefficient.
When the PWM duty ratio adjustment is performed on the programmable power supply based on the voltage coefficient, the duty ratio under a signal with a certain frequency is set to be P DC, and the compensated duty ratio is as follows: kv is P DC.
When the voltage coefficient is larger than 1, the compensation cannot be met even though the PWM duty ratio is maximum when the bus is constant voltage, the envelope adjustment is performed on the programmable power supply based on the voltage coefficient, and when the envelope adjustment is performed on the programmable power supply based on the voltage coefficient, the reference voltage Vref of the programmable power supply or the voltage division ratio of the Digital Potentiometer (DP) is adjusted. Specifically, the voltage division ratio of the programmable power supply is changed by the digital potentiometer 50 to further realize envelope adjustment of the transmitted signal, and in some embodiments, the digital potentiometer 50 is selected as an AD5260 of ADI company.
In an embodiment of the present disclosure, the programmable power supply is selected as a BUCK power supply, the digital potentiometer is used as a voltage feedback network to perform voltage feedback on the programmable power supply, a specific circuit structure of the digital potentiometer is shown in fig. 3, the digital potentiometer is used as a circuit structure including a first resistor Ro1 and a second resistor Ro2, and an output voltage of the programmable power supply can be adjusted by Ro1/Ro2, where the output voltage of the programmable power supply is:
Vout=（1+Ro1/Ro2）*Vref；
Where Vout is the output voltage, vref is the reference voltage of the power supply, ro1/Ro2 is the voltage division ratio.
Correspondingly, the formula for adjusting the partial pressure ratio of the Digital Potentiometer (DP) is as follows:
Ro1/Ro2= （Kv’*Vout）/（Vref-1）；
Where Kv 'is the desired output voltage of the programmable power supply, kv' is a voltage coefficient, and Vout is the output voltage of the initial programmable power supply.
As shown in fig. 4, the present solution provides a modulation method of a wideband transducer based on envelope modulation, which is implemented based on the above-mentioned transmission modulation circuit of the wideband transducer based on envelope modulation, and includes the following steps:
Closing the first switch 41 and turning on the second switch 42 by the main controller 10 so that the emission modulation circuit of the envelope modulation-based broadband transducer is in an impedance measurement state;
Adjusting the impedance network analyzer 20 to couple the broadband transducer 70, and controlling the impedance network analyzer 20 to generate signals with different frequencies through the main controller 10 and obtaining voltage coefficients under the signals with different frequencies;
Turning on the first switch 41 and turning off the second switch 42 by the main controller 10 causes the envelope modulation-based broadband transducer emission modulation circuit to be in a signal emission state, and PWM duty cycle adjustment envelope adjustment is performed on the programmable power supply based on a voltage coefficient before the signal is emitted, wherein the PWM duty cycle adjustment is performed on the programmable power supply when the voltage coefficient is less than 1, and the reference voltage Vref of the programmable power supply or the voltage division ratio of the digital potentiometer is adjusted to perform envelope adjustment when the voltage coefficient is greater than 1.
The specific circuit structure of the emission modulation circuit of the wideband transducer based on envelope modulation is as described above, and is not described in detail herein, and only the implementation steps are described in detail below to facilitate understanding:
Specifically, in the "adjust impedance network analyzer 20 to couple broadband transducer 70" step, impedance network analyzer 20 includes coupling transformer 21, wherein DPDT switch relay 22 is switched to connect broadband transducer 70 and coupling transformer 21 or transmit power amplifier 23, and DPDT switch relay 22 is switched such that coupling transformer 21 is secondary connected to broadband transducer 70 and disconnected from transmit power amplifier 23.
In the "control the impedance network analyzer 20 to generate signals of different frequencies and acquire voltage coefficients under the signals of different frequencies through the main controller 10", the signal source 24 in the impedance network analyzer 20 is controlled to generate signals of different frequencies through the main controller 10, and the primary voltage Vs on the side of the access signal source 24 and the primary current I on the side of the ground of the coupling transformer 21 are acquired to obtain the impedance under the signals of different frequencies, the applied conductivity under the signals of corresponding different frequencies is calculated based on the impedance under the signals of different frequencies, and the voltage coefficients under the signals of different frequencies are calculated based on the applied conductivity.
The method for measuring the effective value of the current constantly adopts the main controller 10 to collect the primary voltage Vs at the side of the coupling transformer 21 connected with the signal source 24 and the primary current I at the side of the grounding to obtain the impedance under the signals with different frequencies, and the calculation formula of the impedance is as follows:
Z=Vs/I；
where Vs is the primary voltage, I is the primary current, and Z is the impedance at the current frequency.
Specifically, the inverse of the impedance is taken to obtain the conductance under the signals with the corresponding frequencies, the applied conductivity under the signals with different frequencies is calculated, the power coefficient under the signals with different frequencies is obtained according to the calculation based on the applied conductivity, and the inverse of the power coefficient is taken to obtain the voltage coefficient under the signals with different frequencies.
Specifically, the impedance (Z 1、Z2…Zn) under the signals (f 1、f2…fn) with different frequencies is calculated, the inverse of the impedance is taken to obtain the conductance (G 1、G2……Gn) under the signals with corresponding frequencies, the applied conductivity (P 1∽Pn) under the signals with different frequencies is calculated according to p=g×u 2, U is a voltage, the power coefficient (K 1、K2…Kn) under the signals with different frequencies is calculated according to kx=px/Ps (x=1, 2 … … n) based on the applied conductivity (P 1∽Pn), wherein Ps is electric power under constant pressure, and the inverse of the power coefficient is taken to obtain the voltage coefficient kv=1/Kx under the signals with different frequencies.
In the step of performing PWM duty cycle adjustment on the programmable power supply when the voltage coefficient is smaller than 1, when the PWM duty cycle adjustment is performed on the programmable power supply based on the voltage coefficient, the duty cycle under a signal with a certain frequency is set to be P DC, and the compensated duty cycle is: kv is P DC. At this time, the PWM duty ratio of the programmable power supply is adjusted by the PWM pulse generator.
In the step of adjusting the reference voltage Vref of the programmable power supply or the voltage division ratio of the digital potentiometer to perform envelope adjustment when the voltage coefficient is greater than 1, the formula for adjusting the voltage division ratio of the digital potentiometer is: ro1/Ro 2= (Kv' ×vout)/(Vref-1); where Kv 'is the desired output voltage of the programmable power supply, kv' is a voltage coefficient, and Vout is the output voltage of the initial programmable power supply.
In addition, in order to adapt to a certain dynamic range, the primary voltage is regulated according to the primary current obtained by measurement according to the scheme, and the specific regulation mode is as follows: ① If the current voltage is smaller than the reference value and the primary voltage is not greater than the primary voltage maximum value, the value of the primary voltage is adjusted to be greater by the main controller 10; ② If the current voltage is greater than the reference value and the primary voltage is not greater than the primary voltage maximum value and the primary voltage is greater than the primary voltage minimum value, the value of the primary voltage is adjusted by the main controller 10 to become smaller. The specific formula is as follows: if (Vi < ViREF) & & (Vs < = VsMAX), vs ≡
If (Vi>ViREF)&&（Vs<=VsMAX）&&（Vs>VsMin）， Vs ↓。
Where Vi is the current voltage, viREF is the reference value, vs is the primary voltage, vsMAX is the primary voltage maximum, and VsMin is the primary voltage minimum.
In addition, since the impedance range of the wideband transducer 70 in engineering is within a certain interval range, the impedance of the wideband transducer 70 in an abnormal state is not greater than the maximum impedance value Zmax of the interval range, in order to ensure that the primary voltage of the design margin scheme is designed by parameters with a value twice the maximum value Zmax, the design has the advantages that the sampling of the primary current can be ensured to reach a constant value at the maximum impedance value, and the design principle is as follows:
（VsMAX /Zmax）* I* gain1=ViREF
Wherein VsMAX is the maximum value of the primary voltage, zmax is the maximum impedance value, I is the primary current, gain1 is the gain of the first gain adjuster, viREF is the reference value of the current voltage.
For example, if ViREF =2.5v, gain1=100 and the primary current is 10V/a, and the primary voltage Vs is determined to be in the range of 0V-Vsmax by performing a preliminary scan on the wideband transducer, the current sampling output may reach ViREF, and if ViREF cannot be reached, it is determined that the wideband transducer is abnormal. Setting the measured impedance Z= k Ω, and then Vs is regulated from 0V to 25V; setting measured impedance: z=1kΩ, vs is then adjusted from 0V to 2.5V.
According to the scheme, the broadband transducer transmitter transmitting modulation circuit based on envelope modulation and the corresponding modulation method are used for realizing measurement of on-line impedance and obtaining voltage coefficients under signals with different frequencies based on the impedance, and PWM duty cycle compensation or envelope modulation can be carried out on the programmable power supply based on the voltage coefficients, so that the broadband transducer can output the supplemented envelope signals.
The present application is not limited to the above-mentioned preferred embodiments, and any person who can obtain other various products under the teaching of the present application can make any changes in shape or structure, and all the technical solutions that are the same or similar to the present application fall within the scope of the present application.
Claims (10)
1. A wideband transducer transmit modulation circuit based on envelope modulation, comprising: the system comprises a main controller, an impedance network analyzer, a PWM pulse generator, a first switch, a second switch and a digital potentiometer, wherein the impedance network analyzer, the PWM pulse generator, the first switch, the second switch and the digital potentiometer are communicated with the main controller; when the broadband transducer emission modulation circuit based on envelope modulation is in an impedance measurement state, the impedance network analyzer cooperates with the main controller to realize the detection of the impedance of the broadband transducer, and when the broadband transducer emission modulation circuit based on envelope modulation is in a signal emission state, the digital potentiometer and the PWM pulse generator modulate a programmable power supply based on a control signal, and the broadband transducer emits a modulated envelope signal.
2. The broadband transducer emission modulation circuit based on envelope modulation according to claim 1, wherein the impedance network analyzer comprises a coupling transformer, the broadband transducer is connected with the coupling transformer or the emission power amplifier through a DPDT switch relay switch, an input side of the coupling transformer is connected with a signal source generating signals with different frequencies, the signal source acquires a control signal of the main controller to generate signals with different frequencies, and the signals with different frequencies output by the signal source are sequentially input into the coupling transformer after passing through a third gain regulator and an incident power amplifier.
3. The envelope modulation-based wideband transducer transmit modulation circuit of claim 2, wherein the transformer ratio of the coupling transformer is 1:1.
4. The wideband transducer transmit modulation circuit of claim 2, wherein one end of the input side of the coupling transformer is grounded and a grounded end branch is connected to the second gain adjuster, and the other end of the input side of the coupling transformer is connected to the signal source and an end branch connected to the signal source is connected to the first gain adjuster.
5. A modulation method of a wideband transducer transmit modulation circuit based on envelope modulation, characterized in that the wideband transducer transmit modulation circuit based on envelope modulation of claim 2 is modulated, comprising the steps of: closing the first switch and conducting the second switch through the main controller so that a transmitting modulation circuit of the broadband transducer based on envelope modulation is in an impedance measurement state; the impedance network analyzer is adjusted to be coupled with the broadband transducer, and the main controller is used for controlling the impedance network analyzer to generate signals with different frequencies and obtaining voltage coefficients under the signals with different frequencies; the first switch is turned on and the second switch is turned off through the main controller, so that the broadband transducer transmitting modulation circuit based on envelope modulation is in a signal transmitting state, the programmable power supply is subjected to PWM duty cycle adjustment envelope adjustment based on a voltage coefficient before transmitting signals, the programmable power supply is subjected to PWM duty cycle adjustment when the voltage coefficient is smaller than 1, and the reference voltage Vref of the programmable power supply or the voltage division ratio of the digital potentiometer is adjusted when the voltage coefficient is larger than 1 so as to carry out envelope adjustment.
6. The modulation method of envelope modulation based wideband transducer transmit modulation circuit of claim 5, wherein in the step of "tuning the impedance network analyzer to couple the wideband transducer", the DPDT switch relay is switched such that the coupling transformer is connected to the wideband transducer secondary and disconnected from the transmit power amplifier.
7. The modulation method of a wideband transducer emission modulation circuit based on envelope modulation according to claim 5, wherein in the step of controlling the impedance network analyzer by the main controller to generate signals of different frequencies and obtain voltage coefficients under the signals of different frequencies, the main controller controls the signal source in the impedance network analyzer to generate signals of different frequencies, and collects the primary voltage at the side of the coupling transformer connected to the signal source and the primary current at the side of the ground to obtain the impedance under the signals of different frequencies, calculates the applied conductivity under the signals of corresponding different frequencies based on the impedance under the signals of different frequencies, and calculates the voltage coefficients under the signals of different frequencies based on the applied conductivity.
8. The modulation method of envelope modulation based wideband transducer transmit modulation circuit of claim 5, wherein in the step of "PWM duty cycle adjustment of the programmable power supply when the voltage coefficient is less than 1", when the PWM duty cycle adjustment of the programmable power supply is performed based on the voltage coefficient, the duty cycle under a signal with a certain frequency is set to be P DC, the compensated duty cycle is: kv P DC, where the inverse of the power coefficient is taken to obtain the voltage coefficient kv=1/Kx for signals of different frequencies.
9. The modulation method of envelope modulation based wideband transducer transmit modulation circuit of claim 5, wherein in the step of adjusting the reference voltage Vref of the programmable power supply or the voltage division ratio of the digital potentiometer for envelope adjustment when the voltage coefficient is greater than 1, the formula for adjusting the voltage division ratio of the digital potentiometer is: ro1/Ro 2= (Kv' ×vout)/(Vref-1); where Kv 'is the desired output voltage of the programmable power supply, kv' is a voltage coefficient, vout is the output voltage of the initial programmable power supply, ro1 is a first resistor of the digital potentiometer, and Ro2 is a second resistor of the digital potentiometer.
10. The modulation method of envelope modulation based wideband transducer transmit modulation circuit of claim 5, wherein the primary voltage is adjusted based on the measured primary current by: ① If the current voltage is smaller than the reference value and the primary voltage is not larger than the primary voltage maximum value, the primary voltage value is regulated to be larger by the main controller; ② If the current voltage is greater than the reference value, the primary voltage is not greater than the primary voltage maximum value, and the primary voltage is greater than the primary voltage minimum value, the value of the primary voltage is regulated by the main controller to be smaller.
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| CN112217482A (en) * | 2020-08-31 | 2021-01-12 | 湖南大学 | Electroacoustic transducer system and impedance matching control method thereof |
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| CN111586546A (en) * | 2020-03-26 | 2020-08-25 | 中国船舶重工集团公司第七一五研究所 | Method and system for measuring resonance point transmission response of low-frequency transducer |
| CN112217482A (en) * | 2020-08-31 | 2021-01-12 | 湖南大学 | Electroacoustic transducer system and impedance matching control method thereof |
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Inventor after: Chen Jiali Inventor after: Huang Shiwen Inventor after: Chen Jie Inventor after: Xu Chao Inventor before: Chen Jiali Inventor before: Huang Shiyin Inventor before: Chen Jie Inventor before: Xu Chao |