CN111162741A - Digital power amplifier suitable for active-towed transmit line array and matched filtering method - Google Patents
Digital power amplifier suitable for active-towed transmit line array and matched filtering method Download PDFInfo
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Abstract
The invention provides a digital power amplifier suitable for an active towed transmit line array and a matching filtering method, comprising the following steps: the device comprises a signal preprocessing unit, a power amplification unit, a control unit, an input signal unit and a filtering unit; one end of the signal preprocessing unit is connected with the input signal unit; the signal preprocessing unit can perform pulse width modulation and dead zone control on an input signal; one end of the power amplification unit is connected with the signal preprocessing unit, and the power amplification unit can amplify the power of the PWM signal output by the signal preprocessing unit; the control unit is connected with the signal preprocessing unit and the power amplification unit, and can realize state detection and protection control on the power amplification unit; the filtering unit can realize impedance matching between the power amplification unit and the load. The digital power amplifier can be arranged in the small cylindrical aluminum cylinder for the towed linear array through integrated and modularized design.
Description
Technical Field
The invention relates to the field of electronic technology application, in particular to a digital power amplifier suitable for an active towed transmission line array and a matched filtering method.
Background
The traditional power amplifier has A type, B type, AB type and C type. These amplifiers all belong to linear amplifiers, and directly perform linear amplification on input analog signals, so that nonlinear distortion is small. However, these amplifiers operate in the linear amplification region, so that the internal transistor consumes a significant portion of power during operation, and the transistor consumes a certain amount of power even in the static operation mode, which greatly limits the efficiency of the power amplifier. The concept of class D amplifier was proposed by Baxandall in 1959, and compared with A, B, AB and class C power amplifiers, class D power amplifier has the following characteristics: the output stage MOS tube works in a switching state, the efficiency is high, and the energy utilization rate is improved to more than 90% from the traditional 50%; and secondly, the D-type power amplifier can greatly reduce the volume of the transmitter and save the cost. In recent years, the development of electronic technology has greatly improved the switching frequency of MOS transistors, and the conduction loss has also been reduced so that class D power amplifiers can achieve the performance of analog power amplifiers on the premise of ensuring high efficiency, and have been widely used in consumer electronics and professional audio products. In the application of the towed transmitting line array, due to the conditions of large system, complex structure, special load and the like, the general class-D power amplifier cannot meet the use requirement. Firstly, the traditional class-D power amplifier is only suitable for driving pure resistive loads such as a loudspeaker, the load in the towed transmitting linear array is a transmitting transducer, the transmitting transducer is a capacitive load, the impedance of the transmitting transducer changes along with the frequency change, the output end of the power amplifier is easy to generate a peak, and thus a power tube is damaged; secondly, the traditional D-type power amplifier has no negative feedback, so that the signal distortion rate is high easily, and the problem of electromagnetic radiation is caused at the same time. Moreover, the traditional class-D power amplifier has single function and does not have the interaction capability with external equipment, and the power amplifier has a self-checking function and can monitor the working state of the power amplifier in real time in view of the fact that the towing transmitting line array is in a towing state during working.
Patent document CN110463034A discloses a digital power amplifier, which belongs to the field of power amplifiers, and the digital power amplifier includes: a first DSM, a second DSM, a first PWM, a second PWM, a low-pass filter, a digital up-converter, a comb filter, and a power amplifier; the first PWM is coupled to the first DSM and is used for modulating the first DSM to input a first DSM signal and outputting the first PWM signal; the second PWM is coupled with the second DSM and used for modulating a second DSM signal input by the second DSM and outputting a second PWM signal; the low-pass filter is respectively coupled with the first PWM and the second PWM; the digital up-converter is coupled with the low-pass filter and used for modulating the first PWM signal after low-pass filtering and the second PWM signal after low-pass filtering and outputting a third PWM signal with preset radio frequency; the comb filter is coupled with the digital up-converter and used for suppressing PWM harmonic waves of the third PWM signal; and the power amplifier is coupled with the comb filter and is used for carrying out power amplification processing on the third PWM signal after harmonic suppression. This patent is not well suited for use in an array of actively towed transmit lines.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a digital power amplifier suitable for an active towed transmit line array and a matched filtering method.
The invention provides a digital power amplifier suitable for an active towed transmit line array, which comprises: the device comprises a signal preprocessing unit, a power amplification unit, a control unit, an input signal unit and a filtering unit; one end of the signal preprocessing unit is connected with the input signal unit; the signal preprocessing unit can perform pulse width modulation and dead zone control on an input signal; one end of the power amplification unit is connected with the signal preprocessing unit, and the power amplification unit can amplify the power of the PWM signal output by the signal preprocessing unit; the control unit is connected with the signal preprocessing unit and the power amplification unit, and can realize state detection and protection control on the power amplification unit; the filtering unit plays a role in bridging between the power amplification unit and the load, can realize impedance matching between the power amplification unit and the load, and simultaneously filters high-frequency noise in the power signal to restore a useful signal.
Preferably, the signal preprocessing unit includes: the circuit comprises a filtering control circuit, a gain control circuit, a loop filter, a PWM modulator, a time sequence control circuit and a channel controller; the filter control circuit and the gain control circuit can carry out noise filtering and gain control on the input analog signals; the filtering control circuit and the gain control circuit are connected with the loop filter.
Preferably, the loop filter can feed back the output stage signal of the power amplifier unit to the loop filter, and compare the output stage signal with the input signal of the loop filter, so as to compensate and correct the output signal of the power amplifier, improve the linearity of the power amplifier, and reduce the ripple in the power supply. The loop filter includes: an output terminal of the loop filter; and the output end of the loop filter is connected with the PWM modulator.
Preferably, the PWM modulator can modulate the waveform output by the loop filter to generate a PWM signal, which is sent to the timing control circuit; the time sequence control circuit is connected with the PWM modulator, and can introduce dead time into a PWM signal output by the PWM modulator, so that the damage caused by the simultaneous conduction of an upper bridge arm and a lower bridge arm of the power amplifier unit is avoided; the access controller can control the on-off of the time schedule controller and the power amplifier unit; when the access controller is switched on, the power amplification unit has input signals, and when the access controller is switched off, the power amplification unit has no input signals.
Preferably, the power amplifier unit includes: the system comprises a gate driving circuit, an H-bridge circuit and an information sampling circuit; the gate driving circuit is connected with the sequential control circuit and is used for improving the driving capability of the output signal of the sequential control circuit and ensuring the normal work of the H bridge; the H-bridge circuit includes: 4 high power MOSFETs; the H-bridge circuit can amplify the output signal of the gate electrode driving circuit to generate a power signal with high voltage and large current, and the H-bridge output is connected with the matched filter.
Preferably, the information acquisition circuit can respectively sample current information of a power supply end of the H-bridge circuit, voltage information of an output end of the H-bridge circuit and the working temperature of the H-bridge; the information acquisition circuit can send current information and temperature information to the control unit; the information acquisition circuit can send voltage information to the loop filter.
Preferably, the control unit includes: a master control circuit and a 485 communication circuit; the main control circuit is connected with the information acquisition circuit and is used for acquiring current and temperature information; the master control circuit is connected with the 485 communication circuit and is used for realizing communication with an upper computer; the main control circuit is connected with the signal preprocessing unit and is used for controlling whether a channel controller in the signal preprocessing unit works or not so as to realize the protection control of the power amplification unit; the 485 communication circuit can be used for receiving an access command of the upper computer, and then packaging and uploading the working state information of the power amplification unit to the upper computer, so that the real-time monitoring of the power amplification unit is realized.
According to the matching filtering method provided by the invention, a digital power amplifier suitable for an active towed transmitting line array is adopted, and the method comprises the following steps:
the method comprises the following steps: according to the working frequency band required by the design index, the measured impedance value (conductance B and susceptance G) of the transducer and the emission response SvL are combined, and G is determined by the formula M1XA value of (d);
wherein, SvLmaxFor maximum transmit voltage response in the frequency band, G is the transducer equivalent susceptance, GXIs the equivalent susceptance of a matched filter unit;
step two: specifying
Value, calculated according to the formula M2
A value;
wherein the content of the first and second substances,
is a matched filter unit phase angle;
step three: calculation of B from the formula M3L2R, Z from the formula M4 and formula M5X；
Wherein, BL2Is an inductance L2Conductance value of, ZXIs L2、C2Forming a network equivalent complex impedance with the transducer;
step four: determination of Z by the formula M6LCA value;
wherein ZLCIs L1、C1An equivalent series impedance;
step five: determination of L from the formula M71、C1A value;
the power of the inherent resonance point of the array element can not be obviously improved, namely L1、C1The resonance point of the value should be from BL2And near the resonance point of the B loop;
generally speaking, L1、C1The value of (A) needs to be repeatedly calculated and corrected at each frequency point until each point
The requirements are met and the bandwidth requirements shown by equation M1 are also met.
Preferably, the
Compared with the prior art, the invention has the following beneficial effects:
1. the digital power amplifier suitable for the active towed transmitting linear array has the characteristics of small volume and high power; through the integrated and modularized design, the digital power amplifier can be arranged in a small cylindrical aluminum cylinder for the towed linear array, and the maximum output power of 400W is realized.
2. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of high reliability; except that certain measures are taken in the aspects of integration and modularization, the lower failure rate of elements is ensured, the digital power amplifier also adopts protective measures such as high-temperature protection, overcurrent protection and overvoltage protection, the working state of the power amplifier can be monitored in real time, automatic protective measures can be taken in time once abnormal conditions occur, and the digital power amplifier is restarted to restore work after problems are eliminated.
3. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of modularization; the digital power amplifier is divided into a plurality of functional modules, each functional module is finely designed, the integration degree is greatly improved, and the reliability of the digital power amplifier is also improved.
4. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of intellectualization; the digital power amplifier has an RS485 communication function by adding the control unit, can perform data interaction with external equipment, and realizes the intellectualization of the digital power amplifier.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a schematic diagram of an internal block of a power amplifying unit in the power amplifier according to the embodiment of the present invention.
Fig. 3 is a schematic diagram of an internal block of a matched filter unit in a power amplifier according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the operation flow of the power amplifier in the embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1-4, the present invention provides a digital power amplifier suitable for an active towed transmit line array, comprising: the device comprises a signal preprocessing unit, a power amplification unit, a control unit, an input signal unit and a filtering unit; one end of the signal preprocessing unit is connected with the input signal unit; the signal preprocessing unit can perform pulse width modulation and dead zone control on an input signal; one end of the power amplification unit is connected with the signal preprocessing unit, and the power amplification unit can amplify the power of the PWM signal output by the signal preprocessing unit; the control unit is connected with the signal preprocessing unit and the power amplification unit, and can realize state detection and protection control on the power amplification unit; the filtering unit plays a role in bridging between the power amplification unit and the load, can realize impedance matching between the power amplification unit and the load, and simultaneously filters high-frequency noise in the power signal to restore a useful signal.
Preferably, the signal preprocessing unit includes: the circuit comprises a filtering control circuit, a gain control circuit, a loop filter, a PWM modulator, a time sequence control circuit and a channel controller; the filter control circuit and the gain control circuit can carry out noise filtering and gain control on the input analog signals; the filtering control circuit and the gain control circuit are connected with the loop filter.
Preferably, the loop filter can feed back the output stage signal of the power amplifier unit to the loop filter, and compare the output stage signal with the input signal of the loop filter, so as to compensate and correct the output signal of the power amplifier, improve the linearity of the power amplifier, and reduce the ripple in the power supply. The loop filter includes: an output terminal of the loop filter; and the output end of the loop filter is connected with the PWM modulator.
Preferably, the PWM modulator can modulate the waveform output by the loop filter to generate a PWM signal, which is sent to the timing control circuit; the time sequence control circuit is connected with the PWM modulator, and can introduce dead time into a PWM signal output by the PWM modulator, so that the damage caused by the simultaneous conduction of an upper bridge arm and a lower bridge arm of the power amplifier unit is avoided; the access controller can control the on-off of the time schedule controller and the power amplifier unit; when the access controller is switched on, the power amplification unit has input signals, and when the access controller is switched off, the power amplification unit has no input signals.
Preferably, the power amplifier unit includes: the system comprises a gate driving circuit, an H-bridge circuit and an information sampling circuit; the gate driving circuit is connected with the sequential control circuit and is used for improving the driving capability of the output signal of the sequential control circuit and ensuring the normal work of the H bridge; the H-bridge circuit includes: 4 high power MOSFETs; the H-bridge circuit can amplify the output signal of the gate electrode driving circuit to generate a power signal with high voltage and large current, and the H-bridge output is connected with the matched filter.
Preferably, the information acquisition circuit can respectively sample current information of a power supply end of the H-bridge circuit, voltage information of an output end of the H-bridge circuit and the working temperature of the H-bridge; the information acquisition circuit can send current information and temperature information to the control unit; the information acquisition circuit can send voltage information to the loop filter.
Preferably, the control unit includes: a master control circuit and a 485 communication circuit; the main control circuit is connected with the information acquisition circuit and is used for acquiring current and temperature information; the master control circuit is connected with the 485 communication circuit and is used for realizing communication with an upper computer; the main control circuit is connected with the signal preprocessing unit and is used for controlling whether a channel controller in the signal preprocessing unit works or not so as to realize the protection control of the power amplification unit; the 485 communication circuit can be used for receiving an access command of the upper computer, and then packaging and uploading the working state information of the power amplification unit to the upper computer, so that the real-time monitoring of the power amplification unit is realized.
In one embodiment, the digital power amplifier comprises a signal preprocessing unit, a power amplifier unit, a control unit and a matched filtering unit.
The signal preprocessing unit plays a role in band-pass filtering. The low-noise analog signal processing circuit receives an analog small signal input from the outside, and filters noise mixed in the input signal through a band-pass filter formed by a low-noise operational amplifier, so that the analog signal with high signal-to-noise ratio is output.
The power amplification unit plays a role in power amplification, and the internal components of the power amplification unit are shown in fig. 2, and the power amplification unit comprises a driver, an automatic gain controller, a loop filter, a PWM modulator, a path controller, a time schedule controller, a gate driver, a power switch, a protection controller, a temperature sensor, a current sensor and a startup short circuit detection circuit. The power amplifying unit firstly receives the analog signal output by the signal preprocessing unit, and the analog signal is sent to the loop filter after passing through the driver and the automatic gain controller. Meanwhile, the output stage signal of the power amplifier is fed back to the loop filter and compared with the input signal of the loop filter, so that the output signal of the power amplifier is compensated, corrected and shaped with noise, thereby improving the linearity of the power amplifier and reducing the ripple waves in the power supply (namely improving the power supply rejection ratio). The output of the loop filter is used as the input signal to the PWM modulator, which encodes the input signal into a binary pulse sequence. The channel controller is used for controlling the on-off of the channel, when the power amplifier breaks down, the connection between the PWM modulator and the time schedule controller is disconnected through the channel controller, so that the power amplifier is in a silent state, and when the power amplifier is normal, the channel controller is used for conducting the connection between the PWM modulator and the time schedule controller, so that the PWM signal smoothly enters a rear-stage circuit for amplification. In order to prevent the phenomenon that instantaneous large current break-through occurs on the power switch due to the fact that the on time and the off time of the power switch exist at the same time, dead time is introduced into a driving signal of the power switch, and the function is achieved by a time schedule controller, and the function is to keep one power tube of the other power tube off before the other power tube of the power switch is not completely turned off, namely, two power tubes exist in a time period and are turned off at the same time in the working time sequence of the whole power tube. The introduction of dead time improves efficiency and avoids device burn-out. In general, the output signal of the timing controller cannot directly drive the power switch, and therefore, a gate driver is added at the rear end of the timing controller to enhance the driving capability of the signal. The output signal of the gate driver is used for driving the power switch to work, so that the power amplification of the signal is realized. The power switch adopts a full-bridge structure, and the full-bridge topology has the following advantages: the adaptive power range is large, and is from dozens of watts to upper kilowatts; the power supply fluctuation can be effectively inhibited. In addition, the power amplification unit is additionally provided with a temperature sensor, a current sensor and a startup short circuit detection circuit, the information is uploaded to the control unit through the protection controller, and the control unit controls whether the power amplification unit works or not according to the working state of the power amplification unit. The power amplification unit with the design has the output power of up to 400W under the condition of single power supply of 50V.
The matched filtering unit has the following functions: the method comprises the following steps of firstly, realizing impedance matching between a power amplification unit and a transmitting transducer, thereby improving the output efficiency of a power amplifier and reducing reactive power; and secondly, filtering high-frequency components in the power signal and restoring a fundamental frequency signal. The matched filtering unit adopts a third-order Butterworth filter structure, and the internal structure of the matched filtering unit is shown in figure 3. The matched filtering unit controls the impedance phase angle difference of the whole matched filtering network within +/-10 degrees, increases the proportion of active power, effectively reduces the requirement on power capacity of a power amplifier and reduces the volume.
The control unit collects over-temperature indication information, over-current indication information and normal working indication information output by the power amplification unit, the working state of the power amplification unit is judged after data processing, once the working state is abnormal, reset information is output to the power amplification unit, after the power amplification unit receives a reset command, the internal protection controller controls the access controller to be disconnected, so that a signal access is disconnected, the power amplification unit is in a silent state, and the access controller is reconnected after the working state of the power amplification unit is normal, so that the power amplification unit enters the working mode again. In addition, the control unit also expands the RS485 communication function, and external equipment can access the control unit through the RS485 bus, so that the working state information of the power amplification unit is obtained, and the real-time monitoring of the working state of the power amplifier is realized.
Specifically, in one embodiment, as shown in fig. 4, a digital power amplifier includes a signal preprocessing unit, a power amplifier unit, a matched filter unit, a control unit, a signal source, a power source, a transmitting transducer, and a host. The signal source is used as a signal generator and outputs an analog sinusoidal signal. The output of the signal source is used as the input of the signal preprocessing unit, and the signal preprocessing unit filters the input signal and then sends the filtered input signal to the power amplifying unit.
The digital power amplifier firstly receives the analog signal output by the signal preprocessing unit, and the analog signal is sent to the loop filter after passing through the driver and the automatic gain controller. Meanwhile, the output stage signal of the power amplifier is fed back to the loop filter and compared with the input signal of the loop filter, so that the output signal of the power amplifier is compensated, corrected and shaped with noise, thereby improving the linearity of the power amplifier and reducing the ripple waves in the power supply (namely improving the power supply rejection ratio). The output of the loop filter is used as the input signal to the PWM modulator, which encodes the input signal into a binary pulse sequence. The channel controller is used for controlling the on-off of the channel, when the power amplifier breaks down, the connection between the PWM modulator and the time schedule controller is disconnected through the channel controller, so that the power amplifier is in a silent state, and when the power amplifier is normal, the channel controller is used for conducting the connection between the PWM modulator and the time schedule controller, so that the PWM signal smoothly enters a rear-stage circuit for amplification. In order to prevent the phenomenon that instantaneous large current break-through occurs on the power switch due to the fact that the on time and the off time of the power switch exist at the same time, dead time is introduced into a driving signal of the power switch, and the function is achieved by a time schedule controller, and the function is to keep one power tube of the other power tube off before the other power tube of the power switch is not completely turned off, namely, two power tubes exist in a time period and are turned off at the same time in the working time sequence of the whole power tube. The introduction of dead time improves efficiency and avoids device burn-out. The output signal of the time schedule controller can not directly drive the power switch, and therefore a gate driver is added at the rear end of the time schedule controller to enhance the driving capability of the signal. The output signal of the gate driver is used for driving the power switch to work, so that the power amplification of the signal is realized. In addition, the power amplification unit is additionally provided with a temperature sensor, a current sensor and a startup short circuit detection circuit, and the information is uploaded to the control unit through the protection controller.
The power supply required by the power amplification unit is provided by a power supply, the power supply outputs 50V direct current, and the power is more than 500W. The power signal output by the power amplifying unit is output to the matching filtering unit, the matching filtering unit filters the input signal to restore a useful signal, and meanwhile impedance matching of the power amplifying unit and the transmitting transducer is achieved. The matched filtering unit outputs a power sine signal for driving the transmitting transducer to work.
The control unit receives over-temperature indication information, over-current indication information and normal work indication information input by the power amplification unit, and therefore whether the power amplification unit works normally is judged. When the power amplification unit is judged to have a fault, the control unit outputs reset information and controls the power amplification unit to stop working; when the power amplification unit is judged to be normal, the control unit cancels the reset instruction, so that the power amplification unit restarts to work. The control unit contains an RS485 external interface through which communication is maintained with the host. The host accesses the control unit through the corresponding instruction and receives the current and voltage information of the power amplification unit in the working state, so that the working state of the power amplification unit can be intuitively known.
In particular, in another embodiment, the power amplifier of the present invention is employed in an array of towed transmit lines. The power amplifier was packed into a cylindrical aluminum cylinder of phi 50 × 120mm and immersed in light naphthalene oil. The power supply adopts a switching power supply module, the output voltage is 50V, the power is 500kW, and high-power direct current is provided for the power amplifier. The transmitting transducer adopts the mosaic type tangential polarization piezoelectric ceramic ring, and has the advantages of large power capacity, high structural strength, stable and reliable performance and the like. During the test, the transmitting transducer was placed in water to a depth of 6 meters. The host computer is composed of a computer with an RS485 port, and sends access information to the control unit through the host computer, so that the working state information of the power amplifier is obtained and displayed on the interface of the host computer, and the real-time monitoring of the power amplifier is realized.
The output power of the power amplifier in the working frequency band is found to be more than 400W. The power amplifier operating temperature conditions are shown in the following table:
after the power amplifier works for a long time, the temperature of the cylinder wall tends to be stable and floats at about 45 ℃. In the whole working process, the power amplifier operates stably and reliably all the time, and the reliability of the power amplifier is verified.
In summary, the present invention provides a high performance digital power amplifier suitable for a towed transmit line array, which comprises: the traditional D-type power amplifier is improved, a negative feedback circuit is added, and the distortion rate and the electromagnetic interference of signals are reduced; impedance matching between the power amplification unit and the transmitting transducer and reduction filtering of signals are realized through the matching filtering unit, so that the D-type power amplifier is suitable for capacitive loads of the transmitting transducer; the state self-checking and data interaction of the D-type power amplifier are realized by adding control, so that the intellectualization of the D-type power amplifier is realized. Through the design, the digital power amplifier meets the requirement of the towed transmitting linear array, and is successfully applied to the high-power towed transmitting linear array.
According to the matching filtering method provided by the invention, a digital power amplifier suitable for an active towed transmitting line array is adopted, and the method comprises the following steps:
the method comprises the following steps: according to the working frequency band required by the design index, the measured impedance value (conductance B and susceptance G) of the transducer and the emission response SvL are combined, and G is determined by the formula M1XA value of (d);
wherein, SvLmaxFor maximum transmit voltage response in the frequency band, G is the transducer equivalent susceptance, GXIs the equivalent susceptance of a matched filter unit;
step two: specifying
Value, calculated according to the formula M2
A value;
wherein the content of the first and second substances,
is a matched filter unit phase angle;
step three: calculation of B from the formula M3L2R, Z from the formula M4 and formula M5X；
Wherein, BL2Is an inductance L2Conductance value of, ZXIs L2、C2Forming a network equivalent complex impedance with the transducer;
step four: determination of Z by the formula M6LCA value;
wherein ZLCIs L1、C1An equivalent series impedance;
step five: determination of L from the formula M71、C1A value;
the power of the inherent resonance point of the array element can not be obviously improved, namely L1、C1The resonance point of the value should be from BL2And near the resonance point of the B loop;
generally speaking, L1、C1The value of (A) needs to be repeatedly calculated and corrected at each frequency point until each point
The requirements are met and the bandwidth requirements shown by equation M1 are also met.
Preferably, the
The digital power amplifier suitable for the active towed transmitting linear array has the characteristics of small volume and high power; through the integrated and modularized design, the digital power amplifier can be arranged in a small cylindrical aluminum cylinder for the towed linear array, and the maximum output power of 400W is realized. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of high reliability; except that certain measures are taken in the aspects of integration and modularization, the lower failure rate of elements is ensured, the digital power amplifier also adopts protective measures such as high-temperature protection, overcurrent protection and overvoltage protection, the working state of the power amplifier can be monitored in real time, automatic protective measures can be taken in time once abnormal conditions occur, and the digital power amplifier is restarted to restore work after problems are eliminated. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of modularization; the digital power amplifier is divided into a plurality of functional modules, each functional module is finely designed, the integration degree is greatly improved, and the reliability of the digital power amplifier is also improved. The digital power amplifier suitable for the active towed transmitting line array has the characteristic of intellectualization; the digital power amplifier has an RS485 communication function by adding the control unit, can perform data interaction with external equipment, and realizes the intellectualization of the digital power amplifier.
Those skilled in the art will appreciate that, in addition to implementing the system and its various devices, units provided by the present invention as pure computer readable program code, the system and its various devices, units provided by the present invention can be fully enabled to implement the same functions by logically programming the method steps in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system and various devices, units and units thereof provided by the invention can be regarded as a hardware component, and the devices, units and units included in the system for realizing various functions can also be regarded as structures in the hardware component; means, elements, units for performing various functions may also be regarded as structures within both software and hardware components for performing the method.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
1. A digital power amplifier adapted for use with an actively towed array of transmit lines, comprising: the device comprises a signal preprocessing unit, a power amplification unit, a control unit, an input signal unit and a filtering unit;
one end of the signal preprocessing unit is connected with the input signal unit; the signal preprocessing unit can perform pulse width modulation and dead zone control on an input signal;
one end of the power amplification unit is connected with the signal preprocessing unit, and the power amplification unit can amplify the power of the PWM signal output by the signal preprocessing unit;
the control unit is connected with the signal preprocessing unit and the power amplification unit, and can realize state detection and protection control on the power amplification unit;
the filtering unit can realize impedance matching between the power amplification unit and the load and filter high-frequency noise in the power signal.
2. The digital power amplifier for active towed transmit line array of claim 1, wherein said signal pre-processing unit comprises: the circuit comprises a filter control circuit, a gain control circuit, a loop filter, a PWM modulator, a time sequence control circuit and a channel controller.
The filter control circuit and the gain control circuit can carry out noise filtering and gain control on the input analog signals;
the filtering control circuit and the gain control circuit are connected with the loop filter.
3. The digital power amplifier for the active towed transmit line array of claim 2, wherein the loop filter is capable of feeding back the power amplifier unit output stage signal to the loop filter for comparison with the input signal of the loop filter;
the loop filter includes: an output terminal of the loop filter;
and the output end of the loop filter is connected with the PWM modulator.
4. The digital power amplifier suitable for the active towed transmit line array of claim 3, wherein said PWM modulator is capable of modulating the waveform output by the loop filter to generate a PWM signal for feeding to the timing control circuit;
the time sequence control circuit is connected with the PWM modulator and can introduce dead time into a PWM signal output by the PWM modulator;
the access controller can control the on-off of the time schedule controller and the power amplifier unit.
5. The digital power amplifier for active towed radiating array of claim 1, wherein said power amplifier unit comprises: the system comprises a gate driving circuit, an H-bridge circuit and an information sampling circuit;
the gate driving circuit is connected with the time sequence control circuit;
the H-bridge circuit includes: 4 MOSFETs;
the power of the MOSFET is greater than a set threshold;
the H-bridge circuit can amplify an output signal of the gate driving circuit.
6. The digital power amplifier suitable for the active towed transmit line array of claim 5, wherein the information acquisition circuit is capable of sampling the current information of the power supply terminal of the H-bridge circuit, the voltage information of the output terminal of the H-bridge circuit, and the operating temperature of the H-bridge circuit, respectively;
the information acquisition circuit can send current information and temperature information to the control unit;
the information acquisition circuit can send voltage information to the loop filter.
7. The digital power amplifier for active towed transmit line array of claim 1, wherein said control unit comprises: a master control circuit and a 485 communication circuit;
the main control circuit is connected with the information acquisition circuit;
the master control circuit is connected with the 485 communication circuit;
the main control circuit is connected with the signal preprocessing unit;
the 485 communication circuit can be used for receiving an access command of an upper computer.
8. A matched filtering method using the digital power amplifier for active towed transmit line array of any of claims 1-7, comprising:
the method comprises the following steps: according to the working frequency band required by the design index, the G is determined by the formula M1 in combination with the measured impedance value and the emission response SvL of the transducerXA value of (d);
wherein, SvLmaxFor maximum transmit voltage response in the frequency band, G is the transducer equivalent susceptance, GXIs the equivalent susceptance of a matched filter unit;
step two: specifying
Value, calculated according to the formula M2
A value;
wherein the content of the first and second substances,
is a matched filter unit phase angle;
step three: calculation of B from the formula M3L2R, Z from the formula M4 and formula M5X；
Wherein, BL2Is an inductance L2Conductance value of, ZXIs L2、C2Forming a network equivalent complex impedance with the transducer;
step four: determination of Z by the formula M6LCA value;
wherein ZLCIs L1、C1An equivalent series impedance;
step five: determination of L from the formula M71、C1A value;
L1、C1the resonance point of the value should be from BL2And near the resonance point of the B loop;
L1、C1the value of (A) needs to be repeatedly calculated and corrected at each frequency point until each point
The requirements are met and the bandwidth requirements shown by equation M1 are also met.
9. The matched filtering method as claimed in claim 8, wherein the matched filtering method is characterized in that
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| US20010043652A1 (en) * | 1995-03-31 | 2001-11-22 | Anthony Hooley | Digital pulse-width-modulation generator |
| CN1968007A (en) * | 2005-11-16 | 2007-05-23 | 弥亚微电子（上海）有限公司 | Digital power amplifier adapted for low-voltage carrier communication |
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