Power amplification circuit, power amplification device, and ultrasonic device

Abstract

The utility model provides a kind of power amplifier circuit, power amplifier device and ultrasonic equipment are proposed, power amplifier circuit includes: power interface, control interface, output interface and multiple signal amplification units, each signal amplification unit includes: class D amplifier and filter component, class D amplifier has at least one signal amplification channel, filter component is one-to-one corresponding with signal amplification channel, the power input end of each class D amplifier is electrically connected with power interface, the input end of each signal amplification channel is connected with control interface communication, the output end of each signal amplification channel is electrically connected with the input end of corresponding filter component, the output end of filter component is electrically connected with output interface.The utility model's power amplifier circuit, by setting multiple signal amplification units, class D amplifier is used in each signal amplification unit, can realize the amplification of high frequency signal, and high output power regulation.

Description

Technical Field

[0001] This utility model relates to the field of ultrasound, specifically to a power amplifier circuit, a power amplifier device, and an ultrasonic equipment. Background Technology

[0002] As a non-invasive energy transmission and detection method, ultrasound technology is currently widely used in fields such as non-destructive testing, medical imaging, treatment, and microfluidics, and there is a certain demand for high-performance multi-channel ultrasound driving equipment.

[0003] Multi-element ultrasonic transducers consist of multiple transducer units, enabling beam control and dynamic focusing. This allows for more precise ultrasonic focusing and imaging, improving system resolution and sensitivity. The equipment driving these transducers requires power amplifiers with high-frequency (above 1MHz), high-power (above 10W) ​​output and precise control capabilities. At higher ultrasonic frequencies, the drive circuit must have efficient energy conversion while ensuring signal integrity. However, while existing power amplifiers can guarantee signal integrity, they cannot meet the demands of high power and high frequency, resulting in insufficient output power in current multi-element ultrasonic transducers. Utility Model Content

[0004] This invention aims to at least solve the problem of insufficient output power of power amplifiers used to drive ultrasonic transducers in related technologies, and proposes a power amplifier circuit, a power amplifier device, and an ultrasonic device.

[0005] To achieve the purpose of this utility model, a power amplifier circuit is provided for amplifying the control signal of an ultrasonic transducer. The power amplifier circuit includes: a power interface for connection to a power source, a control interface for inputting control signals, and an output interface for electrical connection to the ultrasonic transducer. The power amplifier circuit includes: multiple signal amplification units, each of which includes: a Class D amplifier and a filter component. The Class D amplifier has at least one signal amplification channel, and the filter component corresponds one-to-one with the signal amplification channel. The power input terminal of each Class D amplifier is electrically connected to the power interface, the input terminal of each signal amplification channel is communicatively connected to the control interface, the output terminal of each signal amplification channel is electrically connected to the input terminal of the corresponding filter component, and the output terminal of the filter component is electrically connected to the output interface. The filter component is used to filter high-frequency noise and match the load impedance.

[0006] In some embodiments, at least one of the Class D amplifiers has a signal amplification channel.

[0007] In some embodiments, at least one of the Class D amplifiers has multiple independent signal amplification channels.

[0008] In some embodiments, the power amplifier circuit further includes an electrical isolator connected between the Class D amplifier and the control interface, wherein the signal amplification channel is communicatively connected to the control interface through the electrical isolator.

[0009] In some embodiments, the power amplifier circuit further includes: a detection device, the input of which is electrically connected to the Class D amplifier, the output of which is electrically connected to the electrical isolator, the detection device being communicatively connected to the control interface through the electrical isolator, and the detection device being used to detect the operating status of the connected Class D amplifier and send the operating status information to the control interface.

[0010] In some embodiments, the electrical isolation element includes an optocoupler.

[0011] In some embodiments, the transmission path from the control interface to each of the Class D amplifiers is configured such that the transmission time of the control signal from the control interface to each of the Class D amplifiers is equal.

[0012] In some embodiments, the transmission path from the output interface to the output of each of the filtering components is configured such that the control signal is transmitted from the output of each of the filtering components to the output interface in equal time.

[0013] In some embodiments, the filtering component includes an LC filter network.

[0014] In some embodiments, the output power of each signal amplification channel in the Class D amplifier is not less than 10W.

[0015] According to a second aspect of the present invention, a power amplification device is also disclosed, comprising: a PCB board and the aforementioned power amplification circuit, wherein the power amplification circuit is disposed on the PCB board.

[0016] In some embodiments, the plurality of signal amplification units are spaced apart on the PCB board, and electrical isolation is formed between two adjacent signal amplification units.

[0017] In some embodiments, the minimum distance between two adjacent signal amplification units satisfies the electrical isolation distance.

[0018] In some embodiments, the power amplification device includes: a plurality of signal input lines, each corresponding to a signal amplification channel of the Class D amplifier, wherein the plurality of signal input lines are connected between the control interface and the corresponding signal amplification channel, and all the signal input lines are of the same length.

[0019] In some embodiments, the power amplification device further includes: a plurality of signal output lines, each corresponding to a filter component, wherein the plurality of signal output lines are connected between the output interface and the corresponding filter component, and all the signal output lines are of the same length.

[0020] According to a third aspect of this utility model, an ultrasonic device is also disclosed, comprising: a plurality of ultrasonic transducers, a control device, and the aforementioned power amplification device, wherein the control interface of the power amplification device is communicatively connected to the control device, and the output interface of the power amplification device is electrically connected to the plurality of ultrasonic transducers.

[0021] The power amplifier circuit of this invention, by setting up multiple signal amplification units, each of which uses a Class D amplifier, can realize the amplification of high-frequency signals using PWM signals. By controlling the duty cycle of the PWM signals, the output power of each signal amplification channel can be adjusted from 0 to 10W. With the help of a filtering component, the amplified PWM signal can be restored to a sine wave or square wave signal suitable for the load, thereby amplifying the output power of the load, and at a lower cost.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the power amplifier circuit according to an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the signal amplification unit of the power amplifier circuit in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the signal amplification unit of a power amplifier circuit according to another embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram illustrating the interaction between the detection device and the Class D amplifier in an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram illustrating the interaction between the detection device and the Class D amplifier according to another embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of a Class D amplifier according to an embodiment of the present invention;

[0029] Figure 7This is a schematic diagram of the power amplifier device according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the ultrasonic device according to an embodiment of the present invention;

[0031] List of reference numerals in the attached diagram:

[0032] 10. Power interface; 20. Control interface; 30. Output interface; 40. Signal amplification unit; 41. Class A amplifier; 42. Filtering component; 43. Electrical isolation component; 50. Detection device; 60. PCB board; 70. Ultrasonic transducer; 80. Control device. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of this utility model, the power amplifier circuit, power amplifier device, and ultrasonic equipment provided by this utility model will be described in detail below with reference to the accompanying drawings.

[0034] Currently, in the field of multi-element ultrasonic transducer driving, linear power amplifiers and high-voltage analog switching matrices are commonly used for power amplification. A linear power amplifier is an amplifier designed to amplify the input signal while maintaining a strict proportional relationship between the output signal and the input signal. In other words, linear power amplifiers prioritize signal integrity, ensuring that the output signal is a perfect, proportionally amplified replica of the input signal.

[0035] However, precisely because its focus is on signal integrity, a static bias current needs to be set to ensure that the transistor operates in the linear region (amplification region). Therefore, even without an input signal, the amplifier itself consumes a lot of power. This not only limits the amplifier's output power (usually less than 10W), but also dissipates the power consumed by the amplifier itself as heat. Therefore, overall, linear power amplifiers are less efficient, generate a lot of heat, and are larger and heavier, resulting in higher costs.

[0036] High-voltage analog switch matrices are electronic switch networks specifically designed for the safe and reliable switching of high-voltage signals, with a focus on signal integrity and safety. However, the switching process of high-voltage analog switches is slow, especially mechanical (e.g., electromagnetic relay) switch matrices, with response times in the millisecond range, making them unsuitable for high-frequency or fast-switching applications. Furthermore, the complex wiring and switching elements within the matrix introduce parasitic capacitance and inductance. This can lead to signal distortion and inter-channel crosstalk in high-frequency signals, such as PWM (Pulse Width Modulation) signals, making it difficult to meet the requirements of high-frequency and high-power ultrasonic applications.

[0037] To address the aforementioned problems, this utility model discloses a power amplifier circuit for amplifying the control signal of the ultrasonic transducer 70, thereby increasing the output power of the ultrasonic transducer 70.

[0038] like Figure 1 and Figure 2 As shown, the power amplifier circuit includes: a power interface 10 for connection to a power source, a control interface 20 for control signal input, an output interface 30 for electrical connection to the ultrasonic transducer 70, and multiple signal amplification units 40. Each signal amplification unit 40 includes: a Class D amplifier 41 and a filter component 42. The Class D amplifier 41 has at least one signal amplification channel, and the filter component 42 corresponds one-to-one with the signal amplification channel. The power input terminal of each Class D amplifier 41 is electrically connected to the power interface 10, the input terminal of each signal amplification channel is communicatively connected to the control interface 20, the output terminal of each signal amplification channel is electrically connected to the input terminal of the corresponding filter component 42, and the output terminal of the filter component 42 is electrically connected to the output interface 30. The filter component 42 is used to filter high-frequency noise and match the load impedance.

[0039] The Class D amplifier 41 in this embodiment, also known as a "switching power amplifier," is a circuit structure that amplifies power by using a high-speed switching transistor (such as a MOSFET) to apply PWM to the input signal. Compared with traditional Class AB and Class C amplifiers, the Class D amplifier 41 is not only smaller and simpler in structure, but also has extremely high efficiency and low heat generation. Therefore, it is suitable for high-power dense deployment and can support higher operating frequencies.

[0040] PWM (Pulse Width Modulation) is an effective technology for controlling power through rapid switching. Its core lies in precisely controlling the average power delivered to the load by changing the "on" and "off" time ratio (i.e., duty cycle) of a fixed-frequency square wave, thereby achieving analog control effects such as speed regulation, dimming, and voltage stabilization. Since each signal amplification channel of the Class D amplifier 41 supports a frequency range up to 2MHz, by controlling the duty cycle using PWM signals, each signal amplification channel can achieve continuous linear adjustment of output power from 0-10W, and supports phase delay control for each signal amplification channel, making it suitable for phased array applications.

[0041] In use, an external PWM signal can enter the signal amplification channel of the Class D amplifier 41 through the control interface 20 and drive the power switching bridge composed of high-speed switching transistors. Under the control of the PWM signal, these high-speed switching transistors alternately switch on and off at extremely high speeds, thereby outputting a high-voltage, high-current PWM signal and realizing power amplification.

[0042] The amplified PWM signal is a high-frequency square wave and cannot be directly applied to the corresponding load (ultrasonic transducer). Therefore, it needs to pass through a filter component 42 to filter out the high-frequency carrier component. The filtered PWM signal is then output to the output interface 30, thereby amplifying the output power of the load.

[0043] The power amplifier circuit of this invention, by setting up multiple signal amplification units 40, each of which uses a Class D amplifier 41, can realize the amplification of high-frequency signals using PWM signals. By controlling the duty cycle of the PWM signals, the output power of each signal amplification channel can be adjusted from 0 to 10W. In conjunction with the filter component 42, the amplified PWM signals can be restored to sinusoidal or square wave signals suitable for the load, thereby amplifying the output power of the load, and at a lower cost.

[0044] In a further embodiment, each signal amplification unit 40 includes an electrical isolator 43, a Class D amplifier 41, and a filter assembly 42. The electrical isolator 43 is connected between the Class D amplifier 41 and the control interface 20, and the signal amplification channel is communicatively connected to the control interface 20 through the electrical isolator 43. By providing the electrical isolator 43, electrical isolation can be formed between the signal amplification unit 40 and the control interface 20, thereby effectively preventing signal backflow and avoiding interference to the signal source.

[0045] like Figure 2 As shown, in this embodiment, each signal amplification unit 40 includes an electrical isolator 43, a Class D amplifier 41, and a filter component 42. The Class D amplifier 41 has a signal amplification channel, the input terminal of which is electrically connected to the electrical isolator 43, and the output terminal of which is electrically connected to the input terminal of the filter component 42.

[0046] In other words, Figure 2 In the embodiment shown, each Class D amplifier 41 is a single-channel amplifier. Using such a single-channel amplifier can reduce the heat generation of each Class D amplifier 41. Moreover, the distance between the two signal amplification channels can be adjusted by controlling the distance between two adjacent Class D amplifiers 41. Therefore, it is more flexible, and the distance between the channels can be larger, which is more conducive to heat dissipation and electrical isolation.

[0047] It should be noted that in the above embodiment, since the Class D amplifier 41 has one signal amplification channel, the corresponding filtering component is one. However, this is not limiting; in other cases, as... Figure 3In the illustrated embodiment, the Class D amplifier 41 may also have multiple signal amplification channels, each of which can be independent of each other. In other words, different signal amplification channels can amplify different PWM signals respectively. In this case, there are also multiple filter components 42, each corresponding to one of the signal amplification channels. The input terminal of each filter component 42 is connected to the output terminal of the corresponding signal amplification channel.

[0048] For example, the Class D amplifier 41 can use the UCD7242 dual-channel driver chip, which has two signal amplification channels, each supporting a switching frequency of up to 2MHz and a stable output of 10W, and is highly efficient and has low heat dissipation.

[0049] In this embodiment, using a Class D amplifier 41 with multiple signal amplification channels can improve the overall integration. For example, multi-channel parallel control can be achieved with fewer Class D amplifiers 41, thus meeting the needs of large-scale ultrasonic arrays. For instance, using a Class D amplifier 41 with a UCD7242 dual-channel driver chip, 32 Class D amplifiers 41 can be set to achieve the output of 64 independent signal amplification channels, thereby controlling up to 64 ultrasonic transducers 70 independently. At the same time, each signal amplification channel supports a switching frequency of up to 2MHz and an adjustable and stable output of 0-10W, thus meeting the requirements of high frequency and high power output.

[0050] In some embodiments, the filtering component 42 includes an LC filter network, with each power amplification channel's output terminal connected to an LC filter network with fixed parameters, used to filter the high-frequency PWM signal output by the Class D power amplifier to generate a high-frequency excitation signal approximating a sine wave. In some embodiments, if the load impedance is the same (e.g., the impedance of all ultrasonic transducers 70 is 50Ω), the LC filter network can have a fixed frequency to adapt to the default load. If the load impedance is different, an impedance matching network can be added between the output terminal of the LC filter network and the output interface 30 to achieve impedance transformation, thereby improving energy transmission efficiency and signal integrity. For example, the LC filter network can be an LC low-pass filter.

[0051] In the above embodiments, the filter component 42 includes an LC filter network. However, this is not limiting; in other embodiments, the filter component may also employ a π-type filter network, a multi-order LC filter structure, or other network structures capable of achieving high-frequency smoothing filtering. In other embodiments, the output of the Class D amplifier 41 may also be isolated or impedance-transformed via a high-frequency transformer to improve the system's load compatibility.

[0052] High-frequency drive signals can also be generated by digital waveform synthesis modules. For example, the target waveform can be generated using direct digital synthesis (DDS) technology and then amplified by a power amplifier before being output.

[0053] In this embodiment, the electrical isolation component 43 is an optocoupler. An optocoupler is an electronic device that uses light as a transmission medium to transmit electrical signals while electrically isolating the input and output circuits. The optocoupler can have one or more input / output channels, selected based on the signal amplification capacity of its corresponding Class D amplifier 41. For example, if the Class D amplifier 41 corresponding to the optocoupler has one signal amplification channel, then the optocoupler can also have one input / output channel; if the Class D amplifier 41 corresponding to the optocoupler has two signal amplification channels, then the optocoupler can also have two input / output channels, and so on. Of course, in some other embodiments, two single-input / output channel optocouplers can be used to correspond to one dual-channel Class D amplifier 41; this is not a limitation in this embodiment.

[0054] It should be noted that in the above embodiments, the electrical isolator 43 is an optocoupler, but this is not limiting. In some other embodiments, the electrical isolator 43 can also be a digital isolator, a transformer, or an integrated opto-capacitive isolation control module, etc. Any component that can achieve both signal transmission and electrical isolation is within the protection scope of this utility model.

[0055] In some embodiments, the power amplifier circuit further includes a detection device 50. The input terminal of the detection device 50 is electrically connected to the Class D amplifier 41, and the output terminal of the detection device 50 is electrically connected to the electrical isolator 43. The detection device 50 is communicatively connected to the control interface 20 through the electrical isolator 43. The detection device 50 is used to detect the operating status of the connected Class D amplifier 41 and send the operating status information to the control interface 20.

[0056] By setting up the detection device 50, the operating status of the Class D amplifier 41 can be monitored. When a fault occurs in the signal amplification channel of the Class D amplifier 41, the fault can be located through the detection device 50, thereby improving the fault monitoring capability.

[0057] It should be noted that there can be one or more detection devices 50. When there are multiple detection devices 50, multiple Class D amplifiers 41 can be detected by one detection device 50, thereby improving detection efficiency.

[0058] Each detection device 50 is connected to the control port via an electrical isolator 43, such as Figure 4As shown, the electrical isolator 43 can be an electrical isolator in the signal amplification unit 40. Alternatively, it can be as follows: Figure 5 As shown, a separate electrical isolator 43 is provided for the detection device 50, and the detection device 50 communicates with the control port through its corresponding electrical isolator 43.

[0059] For example, when the Class D amplifier 41 is driven by a UCD7242 chip, the detection device 50 can use a multiplexer, such as the CD4067. The CD4067 is a 16-channel analog multiplexer that can acquire up to 16 sensor signals. Each UCD7242 chip generates an independent fault signal when an abnormality occurs. Therefore, the (normal / fault) status signals of up to 16 signal amplification channels can be input into a single CD4067, allowing the status of the corresponding signal amplification channel to be confirmed by reading the information from the CD4067.

[0060] like Figure 6 The schematic diagram of the UCD7242 chip shown is an example of a dual-channel driver chip. For instance, the UCD7242 is a dual-channel driver chip. Figure 6 PWM1 is the input terminal of the first signal amplification channel, which is connected to the control interface 20 through the electrical isolation component 43; while VOUT1 is the output terminal of the first amplification channel, which is electrically connected to the filter component 42.

[0061] Figure 6 PWM2 is the input terminal of the second signal amplification channel, which is connected to the control interface 20 through the electrical isolation component 43; while VOUT2 is the output terminal of the second amplification channel, which is electrically connected to the filter component 42.

[0062] Figure 6 The leftmost 18V terminal is the power input terminal, used for electrical connection to power interface 10. When there are many Class D amplifiers 41, making the total number of signal amplification channels greater than 16, multiple CD4067s can be used. During use, the status of each signal amplification channel can be read by address polling, thereby achieving channel-level fault location capability.

[0063] The power amplifier circuit of this invention, by setting up a detection device 50, can quickly locate abnormal signal amplification channels. Compared with the methods in related technologies, it reduces system resource consumption, improves safety monitoring capabilities, and significantly enhances system safety. It is suitable for channel-level dynamic management and fine protection requirements in large-scale high-frequency drive systems.

[0064] It should be noted that in this embodiment, a multiplexer is used to implement address scanning reading of fault signals, but this is not limiting. In some other embodiments, other methods can also be used, such as: using a multi-channel ADC (analog-to-digital converter) in conjunction with GPIO (general purpose input / output port) to scan fault levels, using a status acquisition chip with I2C (internal integrated circuit) / SPI (serial peripheral interface) communication, inputting multiple fault signals to CPLD (complex programmable logic device) / FPGA (field programmable gate array) ports to achieve channel-by-channel monitoring and management, or using multiple fault signals to output fixed data format through an encoder chip and then parsing them, etc., which are not limited in this embodiment.

[0065] In some embodiments, the transmission path from the control interface 20 to each Class D amplifier 41 is configured such that the transmission time of the control signal from the control interface 20 to each Class D amplifier 41 is equal. In use, since the transmission time of the control signal from the control interface 20 to each Class D amplifier 41 is equal, each signal amplification channel can receive signals synchronously, and there is no delay between the signals received by the signal amplification channels.

[0066] In some embodiments, the transmission path from the output interface 30 to the output terminals of each filter component 42 is configured such that the control signal is transmitted from the output terminal of each filter component 42 to the output interface 30 in equal time. Since the amplified control signal is transmitted from the output terminal of each filter component 42 to the output interface 30 in equal time, each amplified signal amplification channel can synchronously reach the corresponding ultrasonic transducer 70, thereby achieving synchronous control.

[0067] According to a second aspect of this utility model, such as Figure 7 As shown, a power amplifier device is also disclosed, including: a PCB board 60 and the aforementioned power amplifier circuit, wherein the power amplifier circuit is disposed on the PCB board 60.

[0068] For example, the wire portion of the power amplifier circuit can be printed on the PCB board 60, and electrical components such as the power interface 10, control interface 20, output interface 30, Class D amplifier 41, filter component 42, and electrical isolation component 43 can be soldered on the PCB board 60 to achieve the connection between electrical components, thereby forming the aforementioned power amplifier circuit.

[0069] In some embodiments, a plurality of signal amplification units 40 are spaced apart on the PCB board 60, and electrical isolation is formed between adjacent signal amplification units 40. By forming electrical isolation between adjacent signal amplification units 40, mutual interference between adjacent signal amplification units 40 can be avoided, thereby improving the stability and reliability of operation of each signal amplification unit 40.

[0070] For example, the minimum distance between two adjacent signal amplification units 40 can be made to meet the electrical isolation distance. By controlling the spacing between two adjacent signal amplification units 40, the spacing between them can meet the electrical isolation standard, thereby forming electrical isolation between the two adjacent signal amplification units 40, avoiding crosstalk between them, and improving the stability and reliability of operation of each signal amplification unit 40. A distributed layout among multiple signal amplification units 40 can also be formed, thereby preventing concentrated heat generation and wiring congestion, and facilitating load balancing and heat dissipation.

[0071] It should be noted that in this embodiment, electrical isolation is achieved by setting an interval distance. However, this is not limiting. In some other embodiments not shown in the figure, electrical isolation can be achieved in other ways, such as setting an insulating insulating element between the two or increasing the interval distance. This is not limited in the embodiments of this utility model.

[0072] It should be noted that, in this embodiment, the connecting wires extending from the power interface 10 are respectively connected to the Class D amplifier 41 of each signal amplification unit 40, thereby reducing mutual current interference.

[0073] In some embodiments, the power amplification device includes a plurality of signal input lines. Each of the plurality of signal input lines corresponds one-to-one with a signal amplification channel of the Class D amplifier 41. The plurality of signal input lines connect the control interface 20 to the corresponding signal amplification channel, and all signal input lines are of the same length. By ensuring that all signal input lines are of the same length, the transmission time of the control signal from the control interface 20 to the signal amplification channel in each Class D amplifier 41 is equal, thereby eliminating delay between signals received by the signal amplification channels.

[0074] In some embodiments, the power amplification device further includes a plurality of signal output lines. Each signal output line corresponds one-to-one with a filter component 42, and the multiple signal output lines are connected between the output interface 30 and the corresponding filter component 42. All signal output lines are of the same length. By ensuring that the signal output lines are all of the same length, the amplified control signal is transmitted from the output end of each filter component 42 to the output interface 30 in equal time, allowing each amplified signal amplification channel to synchronously reach the corresponding ultrasonic transducer 70, thereby achieving synchronous control.

[0075] It should be noted that an electrical isolator 43 is provided between the control interface 20 and the Class D amplifier 41. Therefore, each signal input line is divided into a first sub-segment and a second sub-segment. The first sub-segment connects the electrical isolator 43 to the control interface 20, and the second sub-segment connects the electrical isolator 43 to the input end of the signal amplification channel. Depending on the distance between the electrical isolator 43 and the control interface 20, the length of the first sub-segment of each signal input line may vary, but the total length of the first and second sub-segments of each signal input line should be the same.

[0076] For example, a separate layer can be used on the PCB for routing signal input lines, thereby ensuring uniform trace lengths and synchronization.

[0077] It should be noted that in this embodiment, the power interface 10, control interface 20 and output interface 30 are all parallel interfaces. In other words, the power interface 10 can supply power to multiple signal amplification units 40 at the same time, and the control interface 20 can have multiple independent signal transmission channels, thereby enabling the simultaneous provision of independent PWM signals to multiple signal amplification channels. Similarly, the output interface 30 can also have multiple independent signal transmission channels, thereby enabling the output of multiple independent amplified PWM signals to the corresponding ultrasonic transducers 70.

[0078] According to a third aspect of this utility model, such as Figure 8 As shown, an ultrasonic device is also disclosed, comprising: a plurality of ultrasonic transducers 70, a control device 80, and the aforementioned power amplifier. The control interface 20 of the power amplifier is communicatively connected to the control device 80, and the output interface 30 of the power amplifier is electrically connected to the plurality of ultrasonic transducers 70.

[0079] In use, the communication interface of the control device 80 is connected to the control interface 20. On the one hand, it can provide multiple PWM signals, which can be amplified by entering the power amplification device through the control interface 20. The amplified PWM signals are then output from the output interface 30 to each ultrasonic transducer 70, thereby realizing the independent control and adjustment of each ultrasonic transducer 70.

[0080] The ultrasonic device of this invention receives an independent PWM control signal for each channel, supporting flexible configuration of frequency, duty cycle, and phase. It can achieve linear power adjustment and phase delay control within the range of 0-10W, meeting the precise excitation requirements in phased array ultrasound imaging and ultrasound therapy. Compared with some existing solutions that use a unified drive signal, this invention has higher controllability and beamforming freedom.

[0081] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A power amplifier circuit for amplifying control signals of an ultrasonic transducer (70), the power amplifier circuit comprising: The circuit comprises a power interface (10) for connection to a power source, a control interface (20) for input of control signals, and an output interface (30) for electrical connection to the ultrasonic transducer (70), characterized in that the power amplifier circuit includes: Multiple signal amplification units (40), each of the signal amplification units (40) includes: a Class D amplifier (41) and a filter component (42), the Class D amplifier (41) has at least one signal amplification channel, the filter component (42) corresponds one-to-one with the signal amplification channel, the power input terminal of each Class D amplifier (41) is electrically connected to the power interface (10), the input terminal of each signal amplification channel is communicatively connected to the control interface (20), the output terminal of each signal amplification channel is electrically connected to the input terminal of the corresponding filter component (42), the output terminal of the filter component (42) is electrically connected to the output interface (30), and the filter component (42) is used to filter high-frequency noise and match load impedance.

2. The power amplifier circuit according to claim 1, characterized in that, At least one of the Class D amplifiers (41) has a signal amplification channel.

3. The power amplifier circuit according to claim 1, characterized in that, At least one of the Class D amplifiers (41) has multiple independent signal amplification channels.

4. The power amplifier circuit according to claim 1, characterized in that, The power amplifier circuit also includes: An electrical isolator (43) is connected between the Class D amplifier (41) and the control interface (20), and the signal amplification channel is communicatively connected to the control interface (20) through the electrical isolator (43).

5. The power amplifier circuit according to claim 4, characterized in that, The power amplifier circuit also includes: The detection device (50) has its input terminal electrically connected to the Class D amplifier (41) and its output terminal electrically connected to the electrical isolator (43). The detection device (50) is communicatively connected to the control interface (20) through the electrical isolator (43). The detection device (50) is used to detect the operating status of the connected Class D amplifier (41) and send the operating status information to the control interface (20).

6. The power amplifier circuit according to claim 4, characterized in that, The electrical isolation element (43) includes: an optocoupler and / or a digital isolator.

7. The power amplifier circuit according to claim 1, characterized in that, The transmission path from the control interface (20) to each of the Class D amplifiers (41) is configured such that the transmission time of the control signal from the control interface (20) to each of the Class D amplifiers (41) is equal.

8. The power amplifier circuit according to claim 1, characterized in that, The transmission path from the output interface (30) to the output of each of the filter components (42) is configured such that the control signal is transmitted from the output of each of the filter components (42) to the output interface (30) in equal time.

9. The power amplifier circuit according to claim 1, characterized in that, The filtering component (42) includes an LC filtering network.

10. The power amplifier circuit according to claim 1, characterized in that, The output power of each signal amplification channel in the Class D amplifier (41) is not less than 0-10W.

11. A power amplifier device, characterized in that, include: The PCB board (60) and the power amplifier circuit according to any one of claims 1 to 10, wherein the power amplifier circuit is disposed on the PCB board (60).

12. The power amplifier device according to claim 11, characterized in that, The plurality of signal amplification units (40) are spaced apart on the PCB board (60), and electrical isolation is formed between two adjacent signal amplification units (40).

13. The power amplifier device according to claim 12, characterized in that, The minimum distance between two adjacent signal amplification units (40) satisfies the electrical isolation distance.

14. The power amplifier device according to claim 11, characterized in that, The power amplifier includes: Multiple signal input lines are provided, each corresponding to a signal amplification channel of the Class D amplifier (41). The multiple signal input lines are connected between the control interface (20) and the corresponding signal amplification channel, and all the signal input lines are of the same length.

15. The power amplifier device according to claim 11, characterized in that, The power amplifier device further includes: Multiple signal output lines are provided in a one-to-one correspondence with the filter component (42). The multiple signal output lines are connected between the output interface (30) and the corresponding filter component (42), and all the signal output lines are of the same length.

16. An ultrasonic device, characterized in that, include: The device comprises a plurality of ultrasonic transducers (70), a control device (80), and a power amplification device according to any one of claims 11 to 15, wherein the control interface (20) of the power amplification device is communicatively connected to the control device (80), and the output interface (30) of the power amplification device is electrically connected to the plurality of ultrasonic transducers (70).

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