阅读说明：本技术 一种多路驱动信号的功率监测装置 (Power monitoring device for multiple driving signals ) 是由 吉翔 庞博 刘金明 白景峰 陈亚珠 于 2020-04-13 设计创作，主要内容包括：本发明涉及一种多路驱动信号的功率监测装置,该装置包括依次连接的：控制模块：用以生成控制信号,确定当前进行功率检测的驱动信号通道；通道切换模块：用以接收控制信号并进行功率检测的驱动信号通道的切换；功率检测模块：耦合、计算并显示当前通道驱动信号的入射功率和反射功率。与现有技术相比,本发明具有多路不同类型驱动信号的功率监测、可拓展、非侵入功率监测等优点。(The invention relates to a power monitoring device of a plurality of paths of driving signals, which comprises the following components in sequential connection: a control module: the control signal channel is used for generating a control signal and determining the current power detection driving signal channel; a channel switching module: the switching of a driving signal channel for receiving a control signal and carrying out power detection; a power detection module: and coupling, calculating and displaying the incident power and the reflected power of the current channel driving signal. Compared with the prior art, the invention has the advantages of power monitoring, expandable, non-invasive power monitoring and the like of multiple driving signals of different types.)

1. A power monitoring device for multiple driving signals is characterized in that the device comprises the following components which are connected in sequence:

control module (1): the control signal channel is used for generating a control signal and determining the current power detection driving signal channel;

channel switching module (2): the switching of a driving signal channel for receiving a control signal and carrying out power detection;

power detection module (3): and coupling, calculating and displaying the incident power and the reflected power of the current channel driving signal.

2. The power monitoring device of the multi-channel driving signal according to claim 1, wherein the control module (1) is connected to the multi-channel driving signal (4) for determining the time required for detecting the power of each channel according to the number of the working channels, the signal type and the duty ratio of the multi-channel driving signal (4) and generating the corresponding control signal.

3. The apparatus as claimed in claim 2, wherein the types of the driving signals include continuous wave and pulse wave.

4. A multi-channel driving signal power monitoring device according to any one of claims 1, 2 or 3, wherein the control module (1) is configured to switch between the off or on states of the multi-channel driving signal (4) according to the type of the driving signal.

5. The power monitoring device of a multipath driving signal according to claim 1, wherein the channel switching module (2) is a relay array, and shielding materials are added therein to realize electrical isolation between driving signals and high-voltage electromagnetic shielding of each signal channel.

6. The power monitoring device of claim 5, wherein the switching time of the channel switching module (2) for switching the driving signal channel for power detection is not longer than 10 ms.

7. The power monitoring device of claim 1, wherein the power detection module (3) comprises a power coupling unit (31) and a power calculation unit (32) which are connected in sequence, and the power coupling unit (31) is respectively connected to the multi-channel driving signal (4) and the ultrasonic transducer array (5) to couple the incident power and the reflected power of the current channel driving signal.

8. The power monitoring device for multiple driving signals according to claim 7, wherein the power detection module (3) accesses the driving signal path of the current detected power through the channel switching module (2), the response time of the driving signal path does not exceed 1 μ s, and the insertion loss is not higher than 0.04 dB.

9. The power monitoring device of claim 7, wherein the port impedance of the power coupling unit (31) is 50 Ω, the operating frequency band is 0.5-5 MHz, and the coupling coefficient is not less than 20 dB.

10. The power monitoring device of claim 7, wherein the power calculating unit (32) receives the output of the power coupling unit (31), couples the input power and the output power to the power detecting board through the bi-directional coupler, and obtains the incident power and the reflected power according to the output curve of the power detecting board, specifically:

P＝kU+U₀

Wherein P is the input power of the power detection plate, U is the output voltage of the power detection plate corresponding to the power signal, k is the slope of the output curve of the power detection plate, and U is₀The power detection plate corresponds to the intercept of the curve.

Technical Field

The invention relates to a multi-array element ultrasonic system, in particular to a power monitoring device for multiple driving signals.

Background

The multi-array element ultrasound system is often applied to high-intensity focused ultrasound (HIFU) therapy, the HIFU tumor ablation principle is to focus ultrasonic energy on a target area to cause protein coagulation necrosis of tissue cells near the area, and then to complete therapy, and HIFU acoustic power is determined by the power of a driving signal, so that the power of each driving signal in the multi-array element ultrasound system is monitored, which is beneficial to ensuring the safety and effectiveness of therapy.

The Chinese patent (application No. 201720089620.6, application date: 2017, 1/19/2017, applicant: Shenzhen national communication limited) "power detection device for multi-channel RF signal detection" discloses a device for multi-channel RF signal power detection, which comprises an input interface, an RF switch portion, a power detection portion, a microprocessor and a temperature detection portion, but has some disadvantages:

(1) the device is only used for power detection of input signals, has no output, can only be connected to the tail end of a circuit, and cannot be connected with a subsequent circuit;

(2) the device is applied to a multi-system combiner platform instead of a multi-array element ultrasonic system.

A device for detecting the output power of a power amplifier in batch is disclosed in a Chinese patent (application number: 200710077551.8, application date: 29/11/2007, applicant: the ministry of communications and government of the science and technology in Nanlu in Nanshan district, Guangdong Shenzhen, Guangdong)' a device for detecting the output power of a power amplifier in batch, which comprises a power shunt module, a high-power attenuation module, a power detection module and a control circuit module, can increase the detection speed and efficiency of the power amplifier during production without increasing instruments, but has some defects:

(1) The device only detects the output power of the power amplifier and cannot be used for online detection of the power amplifier and a load in a working state;

(2) it is difficult to apply to multi-element ultrasound systems.

Disclosure of Invention

The present invention is directed to a power monitoring device for multiple driving signals, which overcomes the above-mentioned drawbacks of the prior art.

The purpose of the invention can be realized by the following technical scheme:

a power monitoring device for multiple driving signals comprises the following components which are connected in sequence:

a control module: the control signal channel is used for generating a control signal and determining the current power detection driving signal channel;

a channel switching module: the switching of a driving signal channel for receiving a control signal and carrying out power detection;

a power detection module: and coupling, calculating and displaying the incident power and the reflected power of the current channel driving signal.

The control module is connected with the multi-path driving signals and used for determining the time required by power detection of each path of channel according to the number of working channels, the signal type and the duty ratio of the multi-path driving signals and generating corresponding control signals.

The types of the driving signal include a continuous wave and a pulse wave.

The control module is characterized in that the control module is switched on or off according to the type of the driving signal.

The channel switching module is a relay array, and shielding materials are additionally arranged in the channel switching module to realize electric isolation among driving signals and high-voltage electromagnetic shielding of each signal channel.

The switching time of the channel switching module for switching the driving signal channel for power detection is not longer than 10 ms.

The power detection module comprises a power coupling unit and a power calculation unit which are sequentially connected, wherein the power coupling unit is respectively connected with the multiple driving signals and the ultrasonic transducer array and is used for coupling the incident power and the reflected power of the current channel driving signal.

The power detection module is connected to a driving signal path of the current detection power through the channel switching module, the response time of the power detection module is not more than 1 mu s, and the insertion loss is not higher than 0.04 dB.

The port impedance of the power coupling unit is 50 omega, the working frequency band is 0.5-5 MHz, and the coupling coefficient is not less than 20 dB.

The power calculating unit receives the output of the power coupling unit, couples the input and output power and the reflected power through the dual directional coupler, inputs the power detection board, and obtains the input power and the reflected power according to an output curve of the power detection board, which specifically comprises the following steps:

P＝kU+U₀

Wherein P is the input power of the power detection plate, U is the output voltage of the power detection plate corresponding to the power signal, k is the slope of the output curve of the power detection plate, and U is₀The power detection plate corresponds to the intercept of the curve.

Compared with the prior art, the invention has the following advantages:

the invention aims at a multi-array element ultrasonic system, and realizes power monitoring of a multi-path transducer through switch switching.

The invention can be expanded to power monitoring of multiple driving signals: the relay array is adopted to realize the time division multiplexing of a single power detection module, and further the driving signals of all the energy converters in the multi-array element ultrasonic system can be monitored.

The invention can realize power monitoring of multiple driving signals of different types: and the control signals are determined according to the number of channels, the frequency, the type, the duty ratio and the like of the signals, so that the power monitoring of multi-channel continuous waves or pulse waves can be realized.

Thirdly, non-invasive power monitoring is realized: the power detection module neither destroys the existing connection of the drive signal to the transducer nor affects the power of the drive signal.

Drawings

Fig. 1 is a block diagram of a power monitoring device for multiple driving signals according to the present invention.

Fig. 2 is a schematic diagram of a power monitoring apparatus for four driving signals in an embodiment.

The notation in the figure is:

1. the device comprises a control module, 2, a channel switching module, 3, a power detection module, 4, a plurality of paths of driving signals, 5, a multi-array-element ultrasonic transducer array, 31, a power coupling module, 32 and a power calculation unit.

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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1, the present invention provides a power monitoring device for multiple driving signals of a multi-array element ultrasound system, which includes a control module 1, a channel switching module 2 and a power detection module 3, wherein the control module 1, the channel switching module 2 and the power detection module 3 are connected in sequence.

The control module 1: generating appropriate control signals for detecting the incident power and the reflected power of the multiple paths of driving signals according to the frequency and the type (continuous wave or pulse wave) of each path of driving signals;

the channel switching module 2: switching a driving signal channel for power detection, and realizing high-voltage electromagnetic shielding of each signal channel;

the power detection module 3: and coupling, calculating and displaying the incident power and the reflected power of the current channel driving signal.

Examples

The following further describes a power monitoring device for four driving signals as an example.

As shown in fig. 2, the four driving signals are named as driving signal #1, driving signal #2, driving signal #3 and driving signal #4 from top to bottom, the signal waveform is a sine wave, the frequency is 1MHz, the effective value is 40-80 mV, the sine wave passes through the power amplifier and then enters the channel switching module, and the four-array ultrasonic transducer array is named as transducer #1, transducer #2, transducer #3 and transducer #4 from top to bottom.

In this embodiment, the control module 1 includes a chip or a device having a calculation and output function, and sends an instruction to the channel switching module 2 to control and switch the driving signal channel connected to the power detection module, and the control module 1 adopts a microcontroller having a system clock completing timing function and a digital output pin, and can output a high level and a low level of 3.3V or 0V, so as to control the connection state of the channel switching module 2, i.e., the relay array (relays #1, #2, #3, and # 4).

In this embodiment, the channel switching modules are relays #1, #2, #3 and #4, the actuation time and the release time of the relays are both less than or equal to 10ms, the switching speed is fast, and the connection state of the relays can be controlled by high and low level signals sent by the microcontroller, and the dotted line in the figure indicates that the microcontroller outputs control signals to control the on and off states of the relays. In addition, the relay adopts a double-pole four-throw switch, so that no electrical connection exists between driving signals; meanwhile, in order to prevent electromagnetic interference from influencing the normal work of a subsequent digital circuit, each relay uses a high-voltage isolation means.

In this embodiment, the power detection module 3 accesses four driving signals through the channel switching module 2, and transmits driving signals under the condition that the insertion loss does not exceed 0.04dB, the power detection module 3 connects driving signals of the current channel through the channel switching module 1, taking a channel formed by the driving signal #1 and the transducer #1 as an example, when the relay #1 is connected with the lower end, and the upper ends of other relays are connected, the driving signal #1 passes through the channel switching module 2 to the power detection module 3, and finally reaches the transducer #1 through the channel switching module, and the signals #2 to #4 directly access the transducer #2 to the transducer #4 through the channel switching module, which is to detect the power of the driving signal # 1.

In the embodiment, the power detection module 3 outputs readable power information, including incident power and reflected power, and the power detection module can return readable driving power information, and in the above embodiment, using the bi-directional coupler and the power detection board, the incident power and reflected power of the channel formed by the current driving signal #1 and the transducer #1 can be returned.

In this embodiment, the channel switching module 2 includes a relay for switching between two ends of the power detection module and a connection path between each electrical element. As described above, the power of the channel formed by the driving signal #1 and the transducer #1 can be detected, when the detection channel is switched, the connection path between the relay and each electrical component is used, when the power of the channel formed by the driving signal #2 and the transducer #2 is switched, the relay #1 is connected to the upper end, the relay #2 is connected to the lower end, and the rest is kept unchanged, so that the power detection module is connected between the driving signal #2 and the transducer #2 through the channel switching module, and the power of the driving signal #2 can be detected at this time.

In this embodiment, the channel switching module 2 may be connected to the multiple driving signals and the multiple array element ultrasonic transducer array at the same time, and controlled by the microcontroller, and sequentially connects the single driving signal and the single transducer load via the power detection module, thereby completing the power detection of the multiple driving signals. In this embodiment, the four driving signals are connected to the channel switching module, and the four-array element ultrasonic transducer array is connected to the interface corresponding to the channel switching module; the microcontroller switches the connection state of the relay through high and low levels, so that the channels connected with the power detection module are switched from the channels of the driving signal #1 and the transducer #1 to the channels of the driving signal #2 and the transducer #2, and so on, and all the channels are detected.

In this embodiment, the power monitoring device for the multiple driving signals can be used for detecting the power of the continuous wave and also can be used for detecting the power of the pulse wave. When detecting the pulse wave, after the microcontroller controls the channel switching module to connect the power detection module into a certain channel, the detected power is the power value when the channel has the pulse wave.

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.