Channel switching type multi-channel ultrasonic module

Abstract

The utility model discloses a channel switching type multi-channel ultrasonic module, which relates to the technical field of ultrasonic detection and comprises a decoder circuit, a driving circuit, a channel switching and indicating circuit and a power supply circuit which are integrated on the same circuit board and are connected in sequence, the decoder circuit comprises a control signal input terminal, a 3-8 line decoder and an inverter which are connected in sequence, the driving circuit comprises a plurality of groups of Darlington transistor arrays, and the channel switching and indicating circuit comprises a plurality of relays, a plurality of channel indicating lamps, a plurality of channel terminals and an output terminal. The multiple groups of Darlington transistor arrays are correspondingly connected to a multi-path relay, the multi-path relay is connected with an output terminal, and the output terminal is connected with an external waveform acquisition circuit; the plurality of relays are respectively connected with the corresponding channel indicating lamps and the channel terminals in sequence; and the plurality of channel terminals are respectively connected with the external plurality of ultrasonic transducers in a one-to-one correspondence manner. Only one set of collecting and processing system is needed during multi-channel ultrasound, and the application cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic detection, in particular to a channel switching multi-channel ultrasonic module. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Ultrasonic waves have the characteristics of strong directivity, slow energy consumption in the medium, and long propagation distance in the medium. When ultrasonic waves are emitted in a certain direction, they can be reflected back when they hit an obstacle. When the ultrasonic wave velocity is known, the distance to the obstacle can be calculated by recording the time difference, thereby realizing the distance measurement of the target object, which is ultrasonic ranging.

[0004] Ultrasonic transducers can be used for ultrasonic ranging. Ultrasonic transducers have a combination of single-transmit and single-receive and single-transmit and multiple-receive. The former can achieve single-point distance measurement, and the latter can be combined in an array to achieve regional dot array distance measurement, which can further depict the surface contour of the target in front. However, when the target area to be detected is large and fine, a large number of ultrasonic transducers are required, which brings about a corresponding number of acquisition circuits and computing power requirements, and the application cost is high. Utility Model Content

[0005] In view of the above-mentioned problems and defects existing in the prior art, the utility model provides a channel-switching multi-channel ultrasonic module. Based on the designed fast channel switching, the multi-channel ultrasonic transducers are respectively sent and received. Therefore, in the case of multi-channel ultrasound, only one set of acquisition and processing system is required, which solves the problem of parallel acquisition computing power caused by any multiple channels and effectively reduces the application cost.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A channel switching multi-channel ultrasound module, comprising a decoder circuit, a drive circuit, and a channel switching and indicating circuit which are integrated on the same circuit board and connected in sequence;

[0008] The decoder circuit includes a control signal input terminal, a 3-line to 8-line decoder and an inverter connected in sequence, the drive circuit includes multiple groups of Darlington transistor arrays, the channel switching and indication circuit includes a multi-way relay, multiple channel indicator lights, multiple channel terminals and output terminals, the multiple groups of Darlington transistor arrays are correspondingly connected to the multi-way relays, the multi-way relays are connected to the output terminals, and the output terminals are connected to the external waveform acquisition circuit; the multi-way relays are respectively connected to the corresponding channel indicator lights and channel terminals in sequence, and the multiple channel terminals are respectively connected to the external multi-way ultrasonic transducers one by one.

[0009] According to a further technical solution, in the decoder circuit, the control signal input terminal is respectively connected to the enable pin and three logic pins of the 3-line to 8-line decoder, and the output pins of the 3-line to 8-line decoder are respectively connected to the input pins of the inverter, and the output pin of the inverter serves as the inverted output of the channel control signal.

[0010] According to a further technical solution, the output pins of the 3-line to 8-line decoder are respectively connected to the input pins of the inverter in a channel order, that is, the connection order of the output pins of the 3-line to 8-line decoder is consistent with the channel order according to the circuit connection logic.

[0011] According to a further technical solution, an external control unit is connected to a control signal input terminal in the decoder circuit, and the external control unit includes a single-chip microcomputer, an FPGA microcontroller and a logic device, which are used to input channel control logic to realize free switching between channels.

[0012] According to a further technical solution, the channel control logic is such that only a single channel is turned on at the same time.

[0013] A further technical solution is that the inverter is connected to multiple groups of Darlington transistor arrays, including: the input pins of the multiple groups of Darlington transistor arrays are respectively connected to the output pins of the inverter in a channel sequence, and the output pins of the multiple groups of Darlington transistor arrays serve as the driving outputs of each channel.

[0014] A further technical solution is that the output pins of multiple groups of Darlington transistor arrays are connected one by one to multi-way relays in channel order, the multi-way relays are all normally open relays, a reverse diode is connected in parallel at both ends of the coil of each relay, and each channel indicator light is connected in series with a resistor and then connected in parallel to the two ends of the coil of the multi-way relay.

[0015] A further technical solution also includes a power supply circuit integrated on the same circuit board, wherein the power supply circuit is respectively connected to the decoder circuit, the drive circuit, the channel switching and indication circuit for power supply.

[0016] According to a further technical solution, the power supply circuit includes a DC-DC 5V power supply circuit and a DC-DC 3.3V power supply circuit; the power input end of the DC-DC 5V power supply circuit is connected to the DC power input terminal as a power DC input; the power output end of the DC-DC 5V power supply circuit outputs 5V and is connected to the power input end of the DC-DC 3.3V power supply circuit, and the power output end of the DC-DC 3.3V power supply circuit outputs 3.3V.

[0017] According to a further technical solution, the power output end of the DC-DC 5V power supply circuit is connected to an LED lamp and a resistor and then grounded.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The utility model proposes a channel switching multi-channel ultrasonic module. By designing a decoder circuit, a driving circuit and a channel switching and indication circuit, the control signal is decoded into a multi-channel control signal. Through channel switching, the multi-channel ultrasonic transducers are respectively sent and received with the logic of fast single-transmit and single-receive, so as to achieve a "parallel" ultrasonic detection effect, solve the problems of complex circuits and high task processing requirements brought by multi-channel acquisition, so that only one set of acquisition and processing system is needed in the case of multi-channel ultrasound, solve the problem of parallel acquisition computing power brought by any multi-channel, reduce the module size, and reduce the application cost.

[0020] 2. In the utility model, the connection state between the channel and the output is controlled by a relay switch, which can adapt to the positive and negative voltage waveforms output by the ultrasonic transducer, and the circuit is simple and the cost is low.

[0021] 3. The channel switching multi-channel ultrasonic module proposed in the present invention can be designed with a decoder circuit, a drive circuit, a channel switching and an indication circuit in a superimposed manner according to the demand for a specific number of channels. The circuit requires little modification, there is no restriction on the maximum number of channels, the module has strong adaptability and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the overall framework of the channel switching multi-channel ultrasound module of the utility model;

[0024] Figure 2 It is a circuit connection diagram of the power supply circuit in the utility model;

[0025] Figure 3 It is a circuit connection diagram of a decoder circuit and a drive circuit in the utility model;

[0026] Figure 4 It is a circuit connection diagram of the channel switching and indicating circuit in the utility model. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] like Figure 1 As shown, the utility model discloses a channel switching multi-channel ultrasound module, including a decoder circuit, a drive circuit, a channel switching and indication circuit and a power supply circuit integrated on the same circuit board and connected in sequence. Among them, the decoder circuit includes a control signal input terminal, a 3-line to 8-line decoder and an inverter connected in sequence, the drive circuit includes multiple groups of Darlington transistor arrays, and the channel switching and indication circuit includes a multi-channel relay, multiple channel indicator lights, multiple channel terminals and output terminals.

[0030] Furthermore, the external control unit is connected to the control signal input terminal in the decoder circuit, the control signal input terminal is connected to the 3-line to 8-line decoder, the 3-line to 8-line decoder is connected to the inverter, the inverter is connected to multiple groups of Darlington transistor arrays, the multiple groups of Darlington transistor arrays are correspondingly connected to multi-way relays, the multi-way relays are connected to the output terminals, and the output terminals are connected to the external waveform acquisition circuit; the multi-way relays are respectively connected to the corresponding channel indicator lights and channel terminals in turn, and the multiple channel terminals are then respectively connected to the external multi-way ultrasonic transducers one by one.

[0031] like Figure 3 As shown, in the above decoder circuit, a 4-pin control signal input terminal is used, and the control signal input terminal is respectively connected to the enable pin and three logic pins of the 3-line to 8-line decoder. Considering that the 3-line to 8-line decoder needs a 4-pin control signal input terminal each time to realize 8-way channel control, therefore, in the utility model, two 4-pin control signal input terminals H2 and H3 are set, corresponding to two 3-line to 8-line decoders U3 and U7, respectively, so as to realize 16-channel control; further, in fact, the number of channels can be adjusted according to specific circumstances.

[0032] In addition, the output pins of the 3-line to 8-line decoder are respectively connected to the input pins of the inverter, and the output pins of the inverter are used as the inverted output of the channel control signal. Further, the output pins of the 3-line to 8-line decoder are respectively connected to the input pins of the inverter in the channel order, that is, the connection order of the output pins of the 3-line to 8-line decoder is consistent with the channel order according to the circuit connection logic, and is connected in this way.

[0033] Furthermore, the external control unit is connected to the control signal input terminal in the decoder circuit, and the external control unit includes a microcontroller such as a single chip microcomputer, an FPGA, and a logic device, etc., which is used to input the channel control logic into the module proposed by the utility model to realize free switching between channels; wherein, the channel control logic is that only a single channel is turned on at the same time. Based on the above design, when performing multi-channel ultrasonic detection, each time the channel is switched, an ultrasonic emission must be performed at the same time.

[0034] Specifically, the external control unit connected to the control signal input terminal in the decoder circuit is an STM32 single-chip microcomputer, which is connected to the control signal input terminals H2 and H3 to achieve free switching between 16 channels.

[0035] In the above driving circuit, the Darlington transistor array used is an NPN transistor, and the inverter is connected to multiple groups of Darlington transistor arrays, that is, the input pins of the multiple groups of Darlington transistor arrays are respectively connected to the output pins of the inverter in channel order, and the output pins of the multiple groups of Darlington transistor arrays serve as the driving outputs of each channel.

[0036] Further, such as Figure 3 As shown, the control signal input terminals H2 and H3 are both 4pin, controlling 8 channels respectively, and realizing 16-channel signal switching. Among them, the pin 1 of the signal input terminal H2 and H3 is respectively connected to the pin 6 (enable pin) of the 3-line to 8-line decoder U3 and U7, so as to control the chip U3 and U7 to enable, and the pins 2, 3, and 4 of the control signal input terminals H2 and H3 are respectively connected to the pins 3, 2, and 1 (i.e., logic pins) of U3 and U7. The model of the 3-line to 8-line decoder used in the utility model is SN74HC138DR. At the same time, the pins 1, 2, 3, and 4 of the control signal input terminals H2 and H3 are respectively connected to the 10kΩ resistors R8, R7, R6, R5 and R24, R26, R27, and R28 to GND for signal pull-down.

[0037] Pins 4, 5, and 8 of the 3-line to 8-line decoder U3 and U7 are connected to GND, pin 16 of U3 and U7 is connected to 3.3V, and pins 15, 14, 13, 12, 11, 10, 9, and 7 of U3 and U7 are connected to the input pins of inverters U4, U6, and U9 (defined as nA pins, where n is 1 to 6) in channel order. The model of the inverter is SN74HC14DR. According to the channel order of the 3-line to 8-line decoder, the output pins of inverters U4, U6, and U9 (defined as nY pins, where n is 1 to 6) are used as the inverted outputs of the channel control signals.

[0038] In the utility model, the driving circuit includes two groups of Darlington transistor arrays U5 and U8, and the Darlington transistor array model is ULN2803; the pin 10 of the Darlington transistor arrays U5 and U8 is connected to 5V, and the pin 9 is connected to GND. The input pins 1, 2, 3, 4, 5, 6, 7, and 8 of the Darlington transistor arrays U5 and U8 are respectively connected to the inverter output in channel order; the output pins 18, 17, 16, 15, 14, 13, 12, and 11 of the Darlington transistor arrays U5 and U8 are respectively connected to 10Ω resistors as the driving outputs of each channel.

[0039] like Figure 4 As shown, the output pins of multiple groups of Darlington transistor arrays are connected to the multi-way relays one by one in the channel sequence, and 16-way relays are used in the utility model; the multi-way relay is connected to the output terminal, which is a 2-pin terminal, and the output terminal is connected to the external waveform acquisition circuit; the multi-way relay is connected to the corresponding channel indicator lights and channel terminals in sequence, wherein the multi-way relays are all normally open relays, and a reverse diode is connected in parallel at both ends of the coil of each relay to eliminate the reverse pulse when the relay is turned off; each channel indicator light is connected in series with a resistor and then connected in parallel to both ends of the coil of the multi-way relay to indicate the current channel switch state; and the multiple channel terminals are connected to the external multi-way ultrasonic transducers one by one.

[0040] Specifically, pins 1 and 6 of the multi-way relays K1 to K16 are connected to pin 2 of the output terminal P1, and pin 1 of the output terminal P1 is grounded; pin 2 of the multi-way relays K1 to K16 is connected to 5V, and pin 3 of the multi-way relays K1 to K16 are respectively connected to pin 2 of the channel terminals P2 to P17, and pin 1 of the channel terminals P2 to P17 is grounded; pin 4 of the multi-way relays K1 to K16 is suspended. At the same time, pins 2 and 5 of the multi-way relays K1 to K16 are respectively connected in reverse phase to the corresponding diodes D2 to D17, the model of the diode is B340A, and both ends of the diodes D2 to D17 are respectively connected in parallel with LEDs and 2kΩ resistors for channel indication.

[0041] The power supply circuit is respectively connected to the decoder circuit, the driving circuit, the channel switching and indicating circuit for power supply. Specifically, the power supply circuit includes a DC-DC 5V power supply circuit and a DC-DC 3.3V power supply circuit, wherein the power input end of the DC-DC 5V power supply circuit is connected to the DC power input terminal as the power DC input; the power output end of the DC-DC 5V power supply circuit outputs 5V, the power output end of the DC-DC 5V power supply circuit is connected to the LED lamp and the resistor and then grounded, and the output end is connected to the power input end of the DC-DC 3.3V power supply circuit, and the power output end of the DC-DC 3.3V power supply circuit outputs 3.3V.

[0042] like Figure 2 As shown, the DC-DC 5V power supply circuit uses the main chip U1 of model TPS54232DR. Pin 1 of the chip U1 is connected to a 0.1uF capacitor C1, and the other end of the capacitor C1 is connected to pin 8 of the chip U1; pin 2 of the chip U1 is connected to the DC power input terminal H1 as the power DC input, and the pin 2 is also connected to capacitor C6 to GND (i.e., grounding) for input filtering; pin 3 of the chip U1 is suspended; pin 4 of the chip U1 is connected to an 8.2nF capacitor C7 to GND; pin 5 of the chip U1 is connected to Between resistors R1 and R3, the other end of the resistor R3 is grounded; pin 6 of chip U1 is connected to 10pF capacitor C10 to GND, and the two ends of the capacitor C10 are connected in parallel to a series combination of a 41.2kΩ resistor R2 and a 1nF capacitor C11; pin 7 of chip U1 is connected to GND; pin 8 of chip U1 is reversely connected to diode D1 to GND, the model of diode D1 is B340A, and pin 8 of chip U1 is also connected to 4.7μH inductor L1, the other end of inductor L1 serves as the power output end of the DC-DC 5V power supply circuit, outputting 5V electricity, and the power output end is also connected to 0.1μF capacitor C2, 10μF capacitor C3, and 10μF capacitor C4 respectively and then grounded for output filtering, the power output end is also connected to the other end of the above-mentioned resistor R1, and in addition, the power output end is also connected to a series combination of indicator light LED1 and 2kΩ resistor R4 to GND for power indication.

[0043] The DC-DC 3.3V power supply circuit uses the main chip U2 with model number TPS76633DR. Pins 1 and 2 of the chip U2 are left floating; Pins 3 and 4 of the chip U2 are connected to GND; Pins 5 and 6 of the chip U2 are connected to the power output end of the DC-DC 5V power supply circuit, that is, connected to 5V, and at the same time, pins 5 and 6 are also connected to a 10uF capacitor C5 to GND for input filtering; Pins 7 and 8 of the chip U2 serve as the power output end of the DC-DC 5V power supply circuit, outputting 3.3V electricity, and at the same time, pins 7 and 8 are connected to a 10uF capacitor C8 and a 4.7uF capacitor C9 in parallel and then grounded for output filtering.

[0044] Through the above circuit design, the 5V output of the DC-DC 5V power supply circuit and the 3.3V output of the DC-DC 3.3V power supply circuit are connected to the decoder circuit, the drive circuit, and the channel switching circuit for power supply.

[0045] The channel switching multi-channel ultrasonic module proposed in the utility model decodes the control signal into a multi-channel control signal through the above-mentioned designed decoder circuit, driving circuit and channel switching and indication circuit, and performs transmission and reception operations on the multi-channel ultrasonic transducers respectively through channel switching with the logic of fast single transmission and single reception, thereby realizing a "parallel" ultrasonic detection effect, solving the problems of complex circuits and high task processing requirements brought about by multi-channel acquisition, reducing the module size and reducing the application cost.

[0046] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A channel switching multi-channel ultrasound module, characterized in that: It includes a decoder circuit, a drive circuit, a channel switching and indication circuit which are integrated on the same circuit board and connected in sequence; The decoder circuit includes a control signal input terminal, a 3-line to 8-line decoder and an inverter connected in sequence, the drive circuit includes multiple groups of Darlington transistor arrays, the channel switching and indication circuit includes a multi-way relay, multiple channel indicator lights, multiple channel terminals and output terminals, the multiple groups of Darlington transistor arrays are correspondingly connected to the multi-way relay, the multi-way relay is connected to the output terminal, and the output terminal is connected to the external waveform acquisition circuit; The multi-channel relays are connected with the corresponding channel indicator lights and channel terminals in sequence, and the plurality of channel terminals are connected with the external multi-channel ultrasonic transducers one by one.

2. The channel-switching multi-channel ultrasound module according to claim 1, characterized in that: In the decoder circuit, the control signal input terminal is respectively connected to the enable pin and three logic pins of the 3-line to 8-line decoder, the output pins of the 3-line to 8-line decoder are respectively connected to the input pins of the inverter, and the output pin of the inverter serves as the inverted output of the channel control signal.

3. The channel-switching multi-channel ultrasound module according to claim 2, characterized in that: The output pins of the 3-line to 8-line decoder are connected to the input pins of the inverter in the channel order, that is, the connection order of the output pins of the 3-line to 8-line decoder is consistent with the channel order according to the circuit connection logic.

4. The channel-switching multi-channel ultrasound module according to claim 1, characterized in that: The external control unit is connected to the control signal input terminal in the decoder circuit. The external control unit includes a single chip microcomputer, an FPGA microcontroller and a logic device, which is used to input channel control logic to achieve free switching between channels.

5. The channel-switching multi-channel ultrasound module according to claim 4, characterized in that: The channel control logic is that only one channel is turned on at the same time.

6. The channel-switching multi-channel ultrasound module according to claim 1, characterized in that: The inverter is connected to multiple groups of Darlington transistor arrays, including: the input pins of the multiple groups of Darlington transistor arrays are respectively connected to the output pins of the inverter in a channel sequence, and the output pins of the multiple groups of Darlington transistor arrays serve as driving outputs of each channel.

7. The channel-switching multi-channel ultrasound module according to claim 1, characterized in that: The output pins of multiple groups of Darlington transistor arrays are connected to multi-way relays one by one in channel order. The multi-way relays are all normally open relays. A reverse diode is connected in parallel at both ends of the coil of each relay. Each channel indicator light is connected in series with a resistor and then connected in parallel to both ends of the coil of the multi-way relay.

8. The channel-switching multi-channel ultrasound module according to claim 1, characterized in that: It also includes a power supply circuit integrated on the same circuit board, and the power supply circuit is respectively connected to the decoder circuit, the drive circuit, the channel switching and indicating circuit for power supply.

9. The channel-switching multi-channel ultrasound module according to claim 8, characterized in that: The power supply circuit includes a DC-DC 5V power supply circuit and a DC-DC 3.3V power supply circuit; the power input end of the DC-DC 5V power supply circuit is connected to the DC power input terminal as a power DC input; the power output end of the DC-DC 5V power supply circuit outputs 5V and is connected to the power input end of the DC-DC 3.3V power supply circuit, and the power output end of the DC-DC 3.3V power supply circuit outputs 3.3V.

10. The channel-switching multi-channel ultrasound module according to claim 9, characterized in that: The power output end of the DC-DC 5V power supply circuit is connected to an LED lamp and a resistor and then grounded.

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