JPS634155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an additional device having a built-in power booster circuit connected after a transmitter/receiver of an ultrasonic detector to enhance the transmission output of the ultrasonic detector.

In recent years, fish detection using ultrasonic waves has come to be used in deep sea areas, and it is desired to increase the ultrasonic transmission output in order to improve the detection ability. However, it is uneconomical to replace the ultrasonic fish finder itself with a high-output, high-performance one, so a method has been proposed that uses an existing fish finder and installs an additional device to increase the transmission output, the so-called power booster method. has been done.

However, in an ultrasonic fish finder, when connecting a power booster additional device to the ultrasonic transceiver, the transducer installed on the bottom of the boat is generally used for both transmitting and receiving waves, so the transmitting/receiving switching circuit is located inside the existing fish finder, and the transmitting output line and receiving input line are not separate but are shared, so it is not necessary to modify the existing fish finder or create a complicated power booster circuit. Ta.

When connecting such an additional device, the present invention not only allows the connection to be made using only the existing transducer connection line and does not require a separate receiving signal line, but also allows the additional device to be connected very easily. It is possible to provide an ultrasonic adding device whose internal circuit is simple and inexpensive.

This will be explained in detail below using the drawings. The ultrasonic pulse transmission signal oscillated and amplified by the existing ultrasonic transceiver 1 is output to the outside. Additional device 1
If 1 is not connected, this output is directly sent to transducer 5.
and two signal lines a1, a2 and b
1 and b2 are directly connected.

In addition, shielded wires are generally used for the signal lines a1, a2 and b1, b2, and
represents the shield of this signal line and is connected to earth E.

In this invention, as shown in FIG.
1, a2 and b1, b2, and an additional device 11 is connected between them, and the output of the ultrasonic transceiver 1 is applied to the booster circuit 3 via a diode 2 connected in antiparallel. and the power is amplified. The pulse output of the ultrasonic transceiver 1 is usually several hundred volts or more, and the loss caused by the diode 2 can be ignored.

The ultrasonic pulse output power amplified by the power booster circuit 3 is output to the transducer 5 via the anti-parallel connected diode 4, but the loss of the diode 4 is also within a negligible range.

In addition, the diodes in FIGS. 2 and 4 are a1, b
Although these diodes are placed in series with a2 and b2, they will operate in the same way.

Further, the reactance elements 6 and 7 form a series connection via a diode 8 connected in antiparallel,
It is connected between the input terminals of the booster circuit 3,
It has the role of impedance matching during transmission between the ultrasonic transceiver 1 and the booster circuit 3. Furthermore, the reactance elements 9 and 10 are also connected in series via the diode 8, and are connected between the output terminals of the booster circuit, and have the role of impedance matching between the booster circuit 3 and the transducer 5. There is.

On the other hand, ultrasonic echoes are received by the transducer 5, but the level of the received signal is much weaker than the intensity of the transmission.

Here, diodes 2, 4 and 8 are composed of silicon diodes, but the silicon diodes are
For a small signal of about 0.5 volts, the impedance is high even in the forward current direction, so for a small signal such as that received by the transducer 5, diodes 2, 4, and 8 are all Since it acts as a high impedance, the received signal from the transducer 5 is supplied to the ultrasonic transceiver 1 as a received signal through the reactance elements 9, 10 and 6, 7. At this time, since the booster circuit 3 is separated by the diodes 2 and 4 which are in a high impedance state, and the diode 8 is also in a high impedance state, the received signal is not short-circuited at all.

The circuit shown in FIG. 2 operates exactly the same as that shown in FIG. 1, but has a circuit configuration in which two diodes 8 are connected in series, and their midpoint is grounded.

As explained above, according to the present invention, when connecting an additional device for increasing the output to an ultrasonic detector, it is extremely easy to connect the existing device without any modification or adding signal lines. It also has the advantage of being inexpensive.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the invention. 1... Ultrasonic transceiver, 2, 4, 8... Diode, 3... Booster circuit, 5... Transducer,
6, 7, 9, 10... reactance element, 11...
...Additional equipment, 12...Shield wire for signal line.

Claims (1)

[Claims] 1. In an ultrasonic detector in which an ultrasonic transmitter/receiver, an additional device for increasing its transmission output, and the ultrasonic transmitter/receiver are each connected by two signal lines, Inserting and connecting multiple reactance elements in series between each input line and output line,
An additional device for an ultrasonic detector, comprising a circuit in which the midpoints of the plurality of reactance elements of each line are connected by diodes connected in antiparallel.