WO2021176727A1 - 魚群探知機用送受信器ユニット及びその振動子駆動回路 - Google Patents

魚群探知機用送受信器ユニット及びその振動子駆動回路 Download PDF

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Publication number
WO2021176727A1
WO2021176727A1 PCT/JP2020/009856 JP2020009856W WO2021176727A1 WO 2021176727 A1 WO2021176727 A1 WO 2021176727A1 JP 2020009856 W JP2020009856 W JP 2020009856W WO 2021176727 A1 WO2021176727 A1 WO 2021176727A1
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Prior art keywords
circuit
transformer
transmission
winding
input
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PCT/JP2020/009856
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English (en)
French (fr)
Japanese (ja)
Inventor
重雄 山本
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本多電子株式会社
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Application filed by 本多電子株式会社 filed Critical 本多電子株式会社
Priority to JP2020537246A priority Critical patent/JP7365705B2/ja
Priority to PCT/JP2020/009856 priority patent/WO2021176727A1/ja
Publication of WO2021176727A1 publication Critical patent/WO2021176727A1/ja

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/524—Transmitters

Definitions

  • the present invention relates to a transmitter / receiver unit for a fish finder and a vibrator drive circuit thereof.
  • a fish finder that detects an object to be detected such as a school of fish by transmitting and receiving ultrasonic waves from an ultrasonic vibrator is well known. Then, in a general fish finder, the ultrasonic vibrator is driven based on a high-frequency current generated by an oscillation circuit (see, for example, Reference 1).
  • FIG. 12 schematically shows the electrical configuration of the transmission / reception unit in the conventional fish finder 111.
  • the fish finder 111 is basically composed of a fish finder main body 112 and a transmitter / receiver unit 121.
  • the fish finder main body 112 includes a transmission / reception circuit 114.
  • the transmission / reception circuit 114 includes a transmission circuit unit 115 and a reception circuit unit 116, and the transmission circuit unit 115 and the reception circuit unit 116 are electrically connected to the main body side outlet 113 via a common path. ..
  • the main body side outlet 113 is an outlet for two core wires, and has two signal line terminals t1 and t2 and one grounding terminal t3.
  • the transmitter / receiver unit 121 includes an ultrasonic vibrator 125, a cable for transmitting / receiving signals, and an outlet 124 on the transmitter / receiver unit side.
  • Two input / output core wires 126 and 127 are housed inside the signal transmission / reception cable.
  • a transmitter / receiver unit side outlet 124 is electrically connected to one end side of these input / output core wires 126 and 127.
  • This outlet 124 is also an outlet for two core wires, and has two signal line terminals t1 and t2 and one grounding terminal t3.
  • Input / output core wires 126 and 127 are connected to the signal line terminals t1 and t2, respectively, and a shield 128 surrounding the input / output core wires 126 and 127 is connected to the grounding terminal t3 in the cable.
  • An ultrasonic vibrator 125 is electrically connected to the other end side of the input / output core wires 126 and 127.
  • the transmitter / receiver unit side outlet 124 is attached to the main body side outlet 113, and the fish finder main body 112 side and the transmitter / receiver unit 121 side are electrically connected via a cable. do.
  • the transmitter circuit unit 115 of the transmitter / receiver circuit 114 outputs a transmission signal to the transmitter / receiver unit 121 side.
  • the transmission signal is input to the ultrasonic vibrator 125 via the input / output core wires 126 and 127, converted into ultrasonic vibration of a predetermined frequency, and then ultrasonic waves are transmitted from the ultrasonic vibrator 125. ..
  • the ultrasonic vibrator 125 receives the reflected wave of ultrasonic waves
  • the received signal is output to the fish finder main body 112 side via the input / output core wires 126 and 127, and then received by the transmission / reception circuit 114. It is designed to be incorporated into the circuit unit 116.
  • the input / output core wires 126 and 127 are connected to the primary winding 133 of the transformer 132, and ultrasonic vibration is provided to the secondary winding 134 having twice the number of turns of the primary winding 133.
  • the child 125 is connected. Therefore, the ultrasonic vibrator 125 can be driven in a state where the voltage of the transmission signal is doubled at the time of wave transmission, whereby the transmission gain is improved.
  • the circuit may be switched by using a switching device such as a transistor or a relay so that the received signal is not passed through the transformer 132 at the time of receiving a wave. Be done.
  • a switching device such as a transistor or a relay
  • the device may become complicated and large, leading to high cost.
  • the present invention has been made in view of the above problems, and an object of the present invention is to improve the transmission / reception gain with a relatively simple structure even when the number of input / output core wires is limited. It is an object of the present invention to provide a transmitter / receiver unit for a detector and a vibrator drive circuit thereof.
  • the invention according to claim 1 is provided on the transmitter / receiver unit side including the ultrasonic vibrator and the core wire for input / output, and is based on the transmission signal from the transmitter / receiver circuit on the fish finder main body side.
  • a transmission circuit that inputs the transmission signal to the transformer, and a secondary side of the transformer without passing through a path from the primary side of the transformer to the transmission circuit.
  • a wave receiving circuit which is provided so as to be connected to the input / output core wire and outputs a received signal of the ultrasonic vibrator to the transmitting / receiving circuit is provided, and the said in the secondary winding of the transformer.
  • the number of turns of the connecting portion of the receiving circuit is larger than the number of turns of the primary winding of the transformer, and the receiving circuit is a series resonance circuit that resonates in series near the frequency used by the ultrasonic transducer to reduce the impedance.
  • the gist thereof is an oscillator drive circuit of a transmitter / receiver unit for a fish finder, which is characterized by including a part.
  • the transmission signal is input to the primary side of the transformer via the transmission circuit at the time of transmission. Since the transformer and the ultrasonic vibrator form a parallel resonance circuit by connecting in parallel, the transmission gain is improved as a result of the transmission signal suitable for driving the ultrasonic vibrator being input to the ultrasonic vibrator. Will be done.
  • the receiving circuit is configured to include a series resonance circuit portion that resonates in series near the frequency used by the ultrasonic vibrator to reduce impedance. Therefore, when receiving a wave, the received signal easily flows to the receiving circuit side, and the received signal is output to the input / output core wire side without being stepped down by the transformer.
  • the received signal is boosted. From these things, the reception gain is also improved. Therefore, even when the number of input / output core wires is limited, the transmission / reception gain can be improved with a relatively simple structure.
  • the gist of the invention according to claim 2 is that, in claim 1, the ultrasonic vibrator constitutes the parallel resonant circuit by connecting in parallel with the secondary winding of the transformer. ..
  • the ultrasonic vibrator can be driven by the boosted transmission signal, and the transmission gain can be further improved.
  • the gist of the invention according to claim 3 is that the transformer is an autotransformer in claim 1 or 2.
  • the structure is such that the primary winding and a part of the secondary winding are shared, the amount of winding is reduced and the size is smaller than that of the compound winding transformer. It will be easier to reduce the weight and cost.
  • the gist of the invention according to claim 4 is that the transformer is a compound winding transformer in claim 1 or 2.
  • the primary winding and the secondary winding have a structure in which they are wound separately, the primary side and the secondary side can be insulated and used.
  • the invention according to claim 5 is the invention according to claim 1 or 2, wherein the transformer is a compound winding transformer, and the secondary winding in the compound winding transformer is continuous in a first region and the first region.
  • the ultrasonic transducer is connected to the first region, and the receiving circuit is connected to the portion where the second region is added to the first region.
  • the gist is that they are connected.
  • the ultrasonic transducer is connected to the first region of the secondary winding of the compound winding transformer, while the wave receiving circuit has the second region in the first region. It is connected to the added part. That is, since the number of turns of the connecting portion of the receiving circuit is larger than the number of windings of the connecting portion of the ultrasonic vibrator, the received signal from the ultrasonic vibrator passes through the receiving circuit after being boosted. Therefore, the reception gain can be further improved. Further, with this configuration, the degree of freedom when adjusting the number of turns of the first region connected to the ultrasonic vibrator is relatively large. Therefore, it is convenient to construct a parallel resonance circuit by connecting the transformer and the ultrasonic vibrator in parallel, and it becomes easy to match the transmission signal and the ultrasonic vibrator.
  • the invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the series resonant circuit unit suddenly conducts electricity with a capacitor and an inductor connected in series with each other when a predetermined voltage value is exceeded.
  • the gist is that the element is composed of an element having a low resistance and a current flows, and the element is connected in parallel with either the capacitor or the inductor.
  • the series resonant circuit portion constituting the receiving circuit does not resonate in series, and the impedance is probably high. Therefore, the high-voltage transmission signal that has flowed through the input / output core wire side rarely flows into the wave receiving circuit side, but preferentially flows into the wave transmitting circuit side to drive the ultrasonic vibrator.
  • the series resonance circuit unit is in a state of series resonance near the operating frequency of the ultrasonic vibrator due to the action of the inductor and the capacitor, and the impedance is reduced.
  • the received signal from the ultrasonic transducer hardly flows into the wave transmitting circuit side, and flows preferentially to the receiving circuit side without being attenuated so much, and is not stepped down by the transformer and is not stepped down to the input / output core wire side. Is output to.
  • the series resonance circuit unit is basically a simple circuit composed of a capacitor, an inductor, and the above-mentioned elements, unlike the case where switching control is performed using a switching device, the device becomes complicated and large in size. Can be avoided.
  • the element may be connected in parallel with the inductor, the inductor side may be connected to the transformer, and the capacitor side may be connected to the input / output core wire (claim 7).
  • the element placed closest to the input / output core wire through which the high voltage transmission signal flows is required to have withstand voltage resistance, but the withstand voltage capacitor is better than the withstand voltage inductor.
  • the element may be, for example, one selected from a varistor, a Zener diode and a bidirectional diode (claim 8).
  • the gist of the invention according to claim 9 is that it is a transmitter / receiver unit for a fish finder including the vibrator drive circuit according to any one of claims 1 to 8 and an ultrasonic vibrator. do.
  • a transmitter / receiver unit for a detector and an oscillator drive circuit thereof can be provided.
  • the schematic diagram of the fish finder provided with the transmitter / receiver unit for the fish finder of 1st Embodiment which embodies the present invention.
  • the circuit diagram which shows the oscillator drive circuit of 8th Embodiment The circuit diagram which shows the oscillator drive circuit of another embodiment.
  • FIG. 1 is a schematic view of a fish finder 11 including the transmitter / receiver unit 21 of the present embodiment
  • FIG. 2 is a circuit diagram showing an oscillator drive circuit 31 in the transmitter / receiver unit 21.
  • the fish finder 11 of the present embodiment is basically composed of a fish finder main body 12 and a transmitter / receiver unit 21.
  • the transmitter / receiver unit 21 is replaceable, and at the time of use, a plurality of types suitable for the intended use are selected.
  • the fish finder main body 12 basically includes a transmission / reception circuit 14 similar to that of the prior art shown in FIG.
  • the transmission / reception circuit 14 includes a transmission circuit unit 15 and a reception circuit unit 16, and the transmission circuit unit 15 and the reception circuit unit 16 are electrically connected to the main body side outlet 13 via a common input / output path 17.
  • the main body side outlet 13 is an outlet for two core wires, and has two signal line terminals and one grounding terminal.
  • the common input / output path 17 is electrically connected to each of the two signal line terminals, while one grounding terminal is grounded.
  • the transmission circuit unit 15 outputs the transmission signal via the common input / output path 17 based on the transmission drive signal from the oscillation circuit.
  • the receiving circuit unit 16 receives the received signal via the common input / output path 17, amplifies the received signal, and then outputs the received signal to the processing circuit.
  • the transmitter / receiver unit 21 includes a unit main body 22, a transmitter / receiver unit side outlet 24, and a signal transmission / reception cable 23 connecting between them.
  • Two input / output core wires 26 and 27 are housed inside the cable 23.
  • a transmitter / receiver unit side outlet 24 is electrically connected to one end side of these input / output core wires 26 and 27.
  • This outlet 124 is an outlet for two core wires, and has two signal line terminals t1 and t2 and one grounding terminal t3 (see FIG. 2).
  • the input / output core wire 26 is connected to the signal line terminal t1, and the input / output core wire 27 is connected to the signal line terminal t2.
  • a shield 28 surrounding the input / output core wires 26 and 27 is connected to the ground terminal t3 in the cable 23 as a noise prevention measure.
  • the unit main body 22 of the present embodiment has a structure in which the vibrator drive circuit 31 is housed inside together with the ultrasonic vibrator 25 and is resin-molded.
  • the ultrasonic vibrator 25 is arranged at the bottom of the unit main body 22, and emits ultrasonic waves downward from the bottom of the unit.
  • the number of ultrasonic vibrators 25 is one in this embodiment, but it may be two or more.
  • the vibrator drive circuit 31 of the present embodiment is composed of a plurality of electronic components mounted on a circuit board (not shown) housed in the unit main body 22.
  • the vibrator drive circuit 31 includes a transformer 32, a wave transmitting circuit 41, and a receiving circuit 51.
  • a compound winding transformer 32 having a structure in which the primary winding 35 and the secondary winding 36 are wound separately is used in the present embodiment.
  • the number of turns of the secondary winding 36 is larger than the number of turns of the primary winding 35.
  • the ratio of the number of turns of the primary winding 35 to the number of turns of the secondary winding 36 is 1: 2. ..
  • An input / output core wire 26 is electrically connected to one end side of the primary winding 35 via a bidirectional diode 42A.
  • An input / output core wire 27 is electrically connected to the other end side of the primary winding 35 via another bidirectional diode 42B.
  • the wave transmission circuit 41 is configured by these two bidirectional diodes 42A and 42B so as to connect the primary side of the compound winding transformer 32 and the input / output core wires 26 and 27.
  • the bidirectional diodes 42A and 42B in the wave transmission circuit 41 cut off the path (become an OFF state) without passing a current when the voltage value is equal to or less than the predetermined voltage value, but the electric resistance is sharply lowered when the voltage value exceeds the predetermined voltage value. It has the property of passing an electric current (turning on).
  • the bidirectional diodes 42A and 42B of the present embodiment both have an antiparallel structure using two diodes, and when a predetermined voltage value is exceeded, a current can flow in either direction. ..
  • the secondary winding of the compound winding transformer 32 and the ultrasonic vibrator 25 are connected in parallel, and due to such a connection relationship, the parallel resonance circuit 33 is formed by the compound winding transformer 32 and the ultrasonic vibrator 25. It is configured.
  • the wave receiving circuit 51 includes two series resonant circuit units 52A and 52B including a capacitor 54, an inductor 53, and a bidirectional diode 55.
  • the capacitor 54 and the inductor 53 are connected in series with each other.
  • the free end side of the inductor 53 belonging to one of the series resonant circuit portions 52A is connected to the connection point C1 between the secondary winding 36 of the compound winding transformer 32 and the ultrasonic vibrator 25. Further, the free end side of the capacitor 54 belonging to the series resonance circuit portion 52A is connected to the connection point C3 between the input / output core wire 26 and the bidirectional diode 42A. The bidirectional diode 55 is connected in parallel to the inductor 53.
  • the free end side of the inductor 53 belonging to the other series resonance circuit portion 52B is connected to the connection point C2 between the secondary winding 36 of the compound winding transformer 32 and the ultrasonic vibrator 25. Further, the free end side of the capacitor 54 belonging to the series resonance circuit portion 52B is connected to the connection point C4 between the input / output core wire 26 and the bidirectional diode 42A.
  • the bidirectional diode 55 is connected in parallel to the inductor 53.
  • these series resonance circuit units 52A and 52B are connected to the secondary side of the compound winding transformer 32 and the input / output core wires 26 and 27 without passing through the primary side of the compound winding transformer 32 and the wave transmission circuits 42A and 42B. It is provided so as to connect between them.
  • a capacitor is used so as to resonate in series near the frequency used by the ultrasonic transducer 25 (for example, near the ultrasonic wave of several hundred kHz emitted by the ultrasonic transducer 25 itself).
  • 54 and the inductor 53 are appropriately selected.
  • the impedance of the circuit is reduced. As a result, current can flow through the capacitor 54 and the inductor 53 regardless of the presence of the bidirectional diode 42A.
  • the receiving circuit 51 including the series resonant circuits 52A and 52B functions as a kind of capacitor when transmitting a wave, while passing a signal near the frequency used by the ultrasonic vibrator 25 when receiving a wave. It is possible to grasp that it is a circuit that functions as a bandpass filter that allows.
  • the type of transmitter / receiver unit 21 is first selected. Then, the transmitter / receiver unit side outlet 24 of the selected transmitter / receiver unit 21 is attached to the main body side outlet 13, and the fish finder main body 112 side and the transmitter / receiver unit 121 side are electrically connected via the cable 23. At this time, the two input / output core wires 26 and 27 are electrically connected to the common input / output path 17. Further, the shield 28 is grounded on the fishfinder main body 112 side.
  • the transmitter circuit unit 115 of the transmitter / receiver circuit 14 When the transmitter / receiver unit 21 is driven during wave transmission, the transmitter circuit unit 115 of the transmitter / receiver circuit 14 outputs a high-voltage transmission signal to the transmitter / receiver unit 21 side. Normally, the transmission signal is alternately input via the two input / output core wires 26 and 27. For example, when a transmission signal is input via one of the input / output core wires 26, the bidirectional diode 55 is turned off in the series resonance circuit unit 52A constituting the wave receiving circuit 51. Therefore, the series resonance of the series resonance circuit unit 52A is canceled out, and the impedance of the circuit remains high.
  • the high-voltage transmission signal that has flowed through the input / output core wire 26 can hardly flow into the receiving circuit 51 side, and a short circuit between the primary side and the secondary side of the compound winding transformer 32 is avoided. .. Therefore, the power loss at the time of wave transmission is reduced.
  • the high voltage transmission signal can reach the primary winding 35 of the compound transformer 32 via the bidirectional diode 42A of the wave transmission circuit 41.
  • the bidirectional diode 55 is turned off in the series resonance circuit unit 52B constituting the wave receiving circuit 51. Therefore, the series resonance of the series resonance circuit unit 52B is canceled out, and the impedance of the circuit remains high.
  • the high-voltage transmission signal that has flowed through the input / output core wire 27 can hardly flow into the receiving circuit 51 side, and a short circuit between the primary side and the secondary side of the compound winding transformer 32 is avoided. .. Therefore, the power loss at the time of wave transmission is reduced. Therefore, in these cases, the transmission vibration boosted twice by reaching the secondary winding 36 side from the primary winding 35 side is applied to the ultrasonic vibrator 25 to drive the ultrasonic vibrator 25. .. As a result, the ultrasonic vibrator 25 vibrates at a predetermined frequency and oscillates ultrasonic waves to the outside of the unit main body 22.
  • the reflected wave of the ultrasonic wave previously oscillated by the ultrasonic vibrator 25 is received by the ultrasonic vibrator 25. Then, the ultrasonic vibrator 25 tries to output the received signal to the receiving circuit 51. At this time, signals near the frequency used by the ultrasonic vibrator 25 are input to the series resonant circuit units 52A and 52B constituting the receiving circuit 51. Therefore, the series resonance circuit units 52A and 52B resonate in series due to the action of the inductor 53 and the capacitor 54, the impedance is relatively reduced, and the current easily flows.
  • the received signal when the received signal is output from the ultrasonic vibrator 25 via the connection point C1, the received signal hardly flows into the primary winding 35 side having a relatively high impedance. Instead, the received signal flows into the series resonant circuit portion 52A side of the receiving circuit 51 whose impedance is relatively low. Then, the received signal reaches the input / output core wire 26 side directly without passing through the compound winding transformer 32 and the transmission circuit 41, and is output to the transmission / reception circuit 14. Similarly, when the received signal is output from the ultrasonic vibrator 25 via the connection point C2, the received signal hardly flows into the primary winding 35 side having a relatively high impedance.
  • the received signal flows into the series resonant circuit portion 52B side of the receiving circuit 51 whose impedance is relatively low. Then, the received signal reaches the input / output core wire 27 side directly without passing through the compound winding transformer 32 and the transmission circuit 41, and is output to the transmission / reception circuit 14.
  • the compound winding transformer 32 and the ultrasonic vibrator 25 form a parallel resonance circuit 33 by connecting in parallel. Therefore, a transmission signal suitable for driving the ultrasonic vibrator 25 at the time of wave transmission is input to the ultrasonic vibrator 25 via the wave transmission circuit 41 and the compound winding transformer 32. Then, when the transmission signal passes through the compound winding transformer 32, it is boosted twice and the transmission voltage increases. As a result of the above, the transmission gain can be improved. Further, as a result of the received signal easily flowing to the receiving circuit 51 side at the time of receiving a wave, the received signal can be output without being stepped down by the compound winding transformer 32.
  • the reception gain can also be improved.
  • the oscillator drive circuit 31 does not perform switching control using a switching device, there is no concern that the device becomes complicated, large in size, and costly due to the use of the switching device.
  • the series resonance circuit portions 52A and 52B constituting the wave receiving circuit 51 are basically composed of three types of electronic components, a capacitor 54, an inductor 53, and a bidirectional diode 55. It is a simple circuit configured. Therefore, it can be configured at a relatively low cost, and unlike the case where switching control is performed using a switching device, it is possible to avoid complication and size increase of the device.
  • the bidirectional diode 55 is connected in parallel with the inductor 53 in the series resonance circuits 52A and 52B constituting the wave receiving circuit 51.
  • the inductor 53 side is connected to the secondary side of the compound winding transformer 32, and the capacitor 54 side is connected to the input / output core wires 26 and 27.
  • the component arranged closest to the input / output core wires 26 and 27 through which the high-voltage transmission signal flows is required to have withstand voltage in order to suppress the transmission power loss.
  • the withstand voltage capacitor 54 and the withstand voltage inductor 53 are compared, the withstand voltage capacitor is smaller and cheaper. Therefore, it becomes easier to reduce the size and cost of the device as compared with the case where the connection position is reversed.
  • the structure of the secondary winding 36 of the compound winding transformer 32A is different from that of the first embodiment. That is, the secondary winding 36 of the compound winding transformer 32A includes a first region 36a and a second region 36b that is continuously wound on both ends of the first region 36a.
  • the parallel resonance circuit 33 is configured by connecting the ultrasonic vibrator 25 in parallel to the first region 36a of the secondary winding 36. Further, the wave receiving circuit 51 is connected to the portion obtained by adding the two second regions 36b to the first region 36a.
  • the winding ratio between the primary winding 35 and the first region 36a of the secondary winding 36 is set to, for example, 1: 2.
  • the winding ratio between the primary winding 35 and the amount obtained by adding the two second regions 36b to the first region 36a of the secondary winding 36 is set to, for example, 1: 3. Therefore, the number of turns of the connecting portion of the receiving circuit 51 in the secondary winding 36 is larger than the number of turns of the primary winding 35, and is tripled.
  • the high-voltage transmission signal that has flowed through the input / output core wires 26 and 27 at the time of wave transmission can hardly flow into the wave reception circuit 51 side. It flows into the wave transmission circuit 41 side. Then, a transmission signal that is double boosted by reaching the first region 36a side of the secondary winding 36 from the primary winding 35 side is applied to the ultrasonic vibrator 25 to drive the ultrasonic vibrator 25. .. At the time of receiving a wave, the received signal is boosted when passing through the first region 36a and the second region 36b of the secondary winding 36, and flows into the receiving circuit 51.
  • the received signal rarely flows into the primary side (wave transmission circuit 41 side) having a relatively high impedance, but flows into the series resonance circuit portions 52A and 52B, which have a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wire 26 side directly without passing through the compound winding transformer 32A and the transmission circuit 41, and is not stepped down by the compound winding transformer 32A to the transmission / reception circuit 14. Is output. Therefore, not only the transmission gain but also the reception gain can be improved.
  • the method of connecting the ultrasonic vibrator 25 to the compound winding transformer 32 is different. That is, while the ultrasonic vibrator 25 is connected in parallel with the secondary winding 36 in the first embodiment, the ultrasonic vibrator 25 is connected in parallel with the primary winding 35 in this embodiment.
  • the high-voltage transmission signal flowing through the input / output core wire 27 can hardly flow into the reception circuit 51 side at the time of transmission, and the wave is transmitted. It flows into the primary winding 35 side of the compound winding transformer 32 via the circuit 41. Then, the transmission signal is applied to the ultrasonic vibrator 25 constituting the primary winding 35 and the parallel resonance circuit 33 to drive the ultrasonic vibrator 25. At the time of receiving a wave, when the received signal flows from the primary winding 35 side to the secondary winding 36 side, it is boosted and flows into the receiving circuit 51.
  • the received signal hardly flows into the transmission circuit 41 side having a relatively high impedance, but flows into the series resonance circuit portions 52A and 52B side which have a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wires 26 and 27 directly without passing through the compound winding transformer 32 and the transmission circuit 41, and the transmission / reception circuit is not stepped down by the compound winding transformer 32. It is output for 14. Therefore, the reception gain can be improved.
  • the type of transformer used is different. That is, while the circuit was configured by using the compound winding transformer 32 in the first embodiment, in the present embodiment, the autotransformer having a structure in which a part of the primary winding 35 and the secondary winding 36 is shared.
  • a circuit is constructed using a device 34 (so-called autotransformer).
  • the autotransformer 34 includes a first winding portion 37 and a second winding portion 38, and the first winding portion 37 functions as a primary winding 37, and the first winding portion 37 and the second winding portion 37 are provided.
  • the portion to which the winding portion 38 is added functions as the secondary winding 39.
  • the wave transmission circuit 41 is composed of two bidirectional diodes 42A and 42B, whereas in the present embodiment, it is composed of only one bidirectional diode 42A, which is a circuit component. It is being standardized.
  • the wave receiving circuit 51 is composed of two series resonance circuit units 52A and 52B, whereas in the present embodiment, it is composed of only one series resonance circuit unit 52. Circuit parts are standardized.
  • the number of turns of the secondary winding 39 is larger than the number of turns of the primary winding 37. Specifically, the ratio of the number of turns of the primary winding 37 to the number of turns of the secondary winding 39 is 1: 2. It has become.
  • the vibrator drive circuit 31C of the present embodiment configured in this way can basically exhibit the same effects as those of the first embodiment. That is, at the time of wave transmission, the high-voltage transmission signal flowing through the input / output core wire 26 can hardly flow to the receiving circuit 51 side, and is the primary of the autotransformer 34 via the wave transmitting circuit 41. It flows into the winding 35 side. Then, a transmission signal that is double boosted when output from the secondary winding 39 is applied to the ultrasonic vibrator 25 to drive the ultrasonic vibrator 25.
  • the received signal hardly flows into the primary side (wave transmission circuit 41 side) having a relatively high impedance, but flows into the series resonance circuit unit 52 side having a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wire 26 side directly without passing through the autotransformer 34 and the transmission circuit 41, and is not stepped down by the autotransformer 34 to the transmission / reception circuit 14. Is output. Therefore, not only the transmission gain but also the reception gain can be improved.
  • the autotransformer 34 As a result of using the autotransformer 34, the amount of windings is reduced, and it becomes easier to reduce the size, weight, and cost as compared with the case of using the autotransformer 32. .. Further, since only one transmission circuit 41 and one reception circuit 51 are required, the entire device is simplified.
  • the winding structure of the autotransformer 34A used is slightly different from that of the fourth embodiment. That is, the autotransformer 34 includes a first winding portion 37 and a second winding portion 38a connected in series, and a third winding portion 38a is continuously wound at one end of the second winding portion 38a. A winding portion 38b is provided.
  • the first winding portion 37 functions as the primary winding portion 37
  • the portion in which the first winding portion 37, the second winding portion 38a, and the third winding portion 38b are combined is a portion. It is designed to function as a secondary winding 39.
  • the first winding portion 37 and the second winding portion 38a are defined as "the first region of the secondary winding 39", and the first winding portion 37, the second winding portion 38a, and the second winding portion 38a are defined.
  • the 3 winding portion 38b is defined as "the second region of the secondary winding 39".
  • the ultrasonic vibrator 25 is connected in parallel to the first winding portion 37 and the second winding portion 38a (that is, the first region of the secondary winding 39), and together with these, constitutes a parallel resonance circuit 33.
  • the wave receiving circuit 51 is connected to the first winding portion 37, the second winding portion 38a, and the third winding portion 38b (that is, the second region of the secondary winding 39).
  • the winding ratio of the first winding portion 37, the second winding portion 38a, and the third winding portion 38b is set to, for example, 1: 1: 1. Therefore, the number of turns of the connecting portion of the receiving circuit 51 in the secondary winding 39 is larger than the number of turns of the primary winding 37, and is tripled.
  • the high-voltage transmission signal flowing through the input / output core wire 26 may almost flow into the receiving circuit 51 side at the time of transmission. It cannot be done, and flows into the primary winding 37 side (first winding portion 37 side) of the autotransformer 34 via the wave transmission circuit 41. Then, a transmission signal that is double boosted by reaching the first region side of the secondary winding 39 from the primary winding 37 side is applied to the ultrasonic vibrator 25 to drive the ultrasonic vibrator 25. At the time of receiving a wave, the received signal is boosted when passing through the first region and the second region of the secondary winding 39, and flows into the receiving circuit 51.
  • the received signal hardly flows into the primary side (wave transmission circuit 41 side) having a relatively high impedance, but flows into the series resonance circuit portion 52 side having a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wire 26 side directly without passing through the autotransformer 34A and the transmission circuit 41, and is not stepped down by the autotransformer 34A to the transmission / reception circuit 14. Is output. Therefore, it is possible to improve not only the transmission gain but also the reception gain while achieving miniaturization, weight reduction, cost reduction, and the like.
  • the method of connecting the ultrasonic vibrator 25 to the autotransformer 34B is different. That is, in the fourth embodiment, the ultrasonic vibrator 25 is connected in parallel with the secondary winding 39 (that is, the first winding portion 37 and the second winding portion 38), whereas in the present embodiment, the ultrasonic vibration The child 25 is connected in parallel with the primary winding 37 (first winding portion 37).
  • the high-voltage transmission signal flowing through the input / output core wire 26 can hardly flow into the reception circuit 51 side at the time of transmission, and the transmission signal is transmitted. It flows into the primary winding 37 side of the autotransformer 34B via the circuit 41. Then, the transmission signal is applied to the ultrasonic vibrator 25 constituting the primary winding 37 and the parallel resonance circuit 33 to drive the ultrasonic vibrator 25. At the time of receiving a wave, when the received signal flows from the primary winding 37 side to the secondary winding 38 side, it is boosted and flows into the receiving circuit 51.
  • the received signal hardly flows into the transmission circuit 41 side having a relatively high impedance, but flows into the series resonance circuit portion 52 side having a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wire 26 side directly without passing through the wave transmission circuit 41, and is output to the transmission / reception circuit 14 without being stepped down by the autotransformer 34B. Therefore, the reception gain can be improved while reducing the size, weight, cost, and the like.
  • the structures of the series resonant circuits 52C and 52D are different from those of the first embodiment. That is, the series resonant circuit units 52A and 52B of the first embodiment include a capacitor 54 and an inductor 53 connected in series with each other, and a bidirectional diode 55 connected in parallel with the inductor 53. Then, the free end side of the inductor 53 is connected to the connection point C1 between the secondary winding 36 and the ultrasonic vibrator 25, and the free end side of the capacitor 54 is the input / output core wire 26 and the bidirectional diodes 42A and 42B. It was connected to the connection points C3 and C4.
  • the free end side of the capacitor 54 is connected to the connection point C1 between the secondary winding 36 and the ultrasonic vibrator 25, and the free end side of the inductor 53 is the input / output core wire 26. It is connected to the connection points C3 and C4 with the bidirectional diodes 42A and 42B, respectively. That is, in the case of the first embodiment, the withstand voltage capacitor 54 is arranged on the input side to which the high voltage is applied, whereas in the present embodiment, the withstand voltage inductor 53 is arranged on the input side to which the high voltage is applied. The positional relationship of these parts is reversed.
  • the vibrator drive circuit 31F of the present embodiment configured in this way can basically exhibit the same effects as those of the first embodiment.
  • the withstand voltage capacitor 54 is smaller and cheaper than the withstand voltage inductor 53. Therefore, the configuration of the first embodiment is more advantageous than the configuration of the present embodiment in that it is easy to reduce the size and cost of the device.
  • the structure of the secondary winding 36 of the compound winding transformer 32B is different from that of the first embodiment. That is, in the first embodiment, the secondary windings 36 have only one system (one volume), whereas in the present embodiment, the secondary windings 36 and 61 have two independent systems (two volumes). There is.
  • An ultrasonic vibrator 25 is connected in parallel to one of the two secondary windings 36, and this connection constitutes a parallel resonant circuit 33.
  • a wave receiving circuit 51 is connected to the other secondary winding 36.
  • the winding ratio between the primary winding 35 and the secondary winding 36 is set to, for example, 1: 1
  • the winding ratio between the primary winding 35 and the secondary winding 61 is, for example, 1: 2. Is set to.
  • the high-voltage transmission signal that has flowed through the input / output core wires 26 and 27 at the time of wave transmission can hardly flow into the wave reception circuit 51 side. It flows into the wave transmission circuit 41 side. Then, the transmission signal from the primary winding 35 side to the one secondary winding 36 side is applied to the ultrasonic vibrator 25 to drive the ultrasonic vibrator 25. At the time of receiving a wave, when the received signal passes through the other secondary winding 61, it is boosted twice and flows into the receiving circuit 51.
  • the received signal rarely flows into the primary side (wave transmission circuit 41 side) having a relatively high impedance, but flows into the series resonance circuit portions 52A and 52B, which have a relatively low impedance due to the series resonance.
  • the received signal reaches the input / output core wires 26 and 27 directly without passing through the compound winding transformer 32B and the transmission circuit 41, and the transmission / reception circuit is not stepped down by the compound winding transformer 32B. It is output for 14. Therefore, not only the transmission gain but also the reception gain can be improved.
  • one secondary winding 36 to which the receiving circuit 51 is connected and the other secondary winding 61 to which the ultrasonic vibrator 25 is connected are electrically independent of each other. ing. Therefore, the number of turns of each of the secondary windings 36 and 61 can be arbitrarily set. For example, when adjusting the number of turns of the secondary winding 61, the degree of freedom is relatively large, which is convenient for configuring the parallel resonance circuit 33 by connecting the compound winding transformer 32B and the ultrasonic vibrator 25 in parallel. It becomes. Therefore, it becomes easy to match the transmission signal with the ultrasonic vibrator 25.
  • the vibrator drive circuits 31 to 31G are housed in the unit main body 22 together with the ultrasonic vibrator 25 and resin-molded, but the present invention is not limited to this.
  • the transmitter / receiver unit may be configured by providing the vibrator drive circuits 31 to 31G outside the unit main body 22.
  • the series resonance circuit portions 52, 52A, and 52B of the wave receiving circuit 51 are configured by using the bidirectional diode 42, but the present invention is not limited to this, and for example, a varistor 56A may be used. (See FIG. 10), or two Zener diodes 56B connected in opposite directions may be used (see FIG. 11).
  • the transmission circuit 41 is configured by using the bidirectional diodes 42, 42A, and 42B, but the present invention is not limited to this, and a non-linear resistance element such as a varistor 56A or a Zener diode 56B is used. Of course, it may be configured by using elements such as.
  • the ratio of the number of turns of the primary winding 35 of the compound winding transformer 32 to the number of turns of the connecting portion of the receiving circuit 51 in the secondary winding 36 of the compound winding transformer 32 is calculated. It was set to 1: 2, but it is not limited to this. That is, since the number of turns of the connecting portion of the wave receiving circuit 51 in the secondary winding 36 of the compound winding transformer 32 may be larger than the number of turns of the primary winding 35 of the compound winding transformer 32, for example, this turns ratio may be used. It may be arbitrarily set within the range of 1: 1.1 to 5.0.
  • the number of turns of the connecting portion of the ultrasonic vibrator 25 in the secondary winding 36 of the compound winding transformer 32 is larger than the number of turns of the primary winding 35 of the compound winding transformer 32 as in the above embodiment. It may be, for example, the same number or a smaller number.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
PCT/JP2020/009856 2020-03-06 2020-03-06 魚群探知機用送受信器ユニット及びその振動子駆動回路 WO2021176727A1 (ja)

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PCT/JP2020/009856 WO2021176727A1 (ja) 2020-03-06 2020-03-06 魚群探知機用送受信器ユニット及びその振動子駆動回路

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949098A (ja) * 1982-09-14 1984-03-21 Matsushita Electric Works Ltd 超音波回路
JPH07167947A (ja) * 1993-04-30 1995-07-04 Milltronics Ltd 超音波トランスデューサ用整合変成器
JPH07260925A (ja) * 1994-03-28 1995-10-13 Nec Eng Ltd 送受信装置
US6050945A (en) * 1997-06-27 2000-04-18 Siemens Medical Systems, Inc. Ultrasound front-end circuit combining the transmitter and automatic transmit/receive switch with agile power level control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6911614B2 (ja) * 2017-07-27 2021-07-28 株式会社アイシン 超音波振動子駆動装置
US11269067B2 (en) * 2017-09-12 2022-03-08 Semiconductor Components Industries, Llc Response-based determination of piezoelectric transducer state
JP7020107B2 (ja) * 2017-12-25 2022-02-16 株式会社アイシン 駆動回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949098A (ja) * 1982-09-14 1984-03-21 Matsushita Electric Works Ltd 超音波回路
JPH07167947A (ja) * 1993-04-30 1995-07-04 Milltronics Ltd 超音波トランスデューサ用整合変成器
JPH07260925A (ja) * 1994-03-28 1995-10-13 Nec Eng Ltd 送受信装置
US6050945A (en) * 1997-06-27 2000-04-18 Siemens Medical Systems, Inc. Ultrasound front-end circuit combining the transmitter and automatic transmit/receive switch with agile power level control

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