JP6843357B2 - Shark repellent device - Google Patents

Description

The present invention relates to a shark repellent device for protecting fish, for example, attached to a fishing boat or the like and secured by a fishing line or a fishing net from damage of the shark.

For example, in order to secure fish using a fishing line, a work-in-process thread with a fishing hook attached to the tip is hung in water, and when the fish is caught on the fishing hook, the work-in-process thread is pulled up to catch the fish. When using a fish net, a net is set on the seabed from a fishing boat, and after a while, the net is pulled up to catch fish. However, when the captured fish are withdrawn from the water, they may be targeted by sharks swimming in the vicinity, causing a loss in the catch of fish and causing great damage to fishermen.

Conventionally, as a device for preventing a situation in which a captured fish is attacked by a shark, for example, a device disclosed in Patent Document 1 is known. Sharks have an organ called a Lorenzini bottle on their face that detects a weak electric current, and normally this function can be used to find fish hidden in the sand or fish in the distance. On the other hand, when an electric pulse is generated in water, it reacts sensitively to this. This device includes a first electrode arranged in water and a second electrode arranged at a predetermined distance from the first electrode, and one of the first electrode and the second electrode is a positive electrode and the other. By applying a voltage so that it becomes a negative electrode, an electric pulse can be generated between the electrodes, so it gives an electrical impact to the shark swimming in the water and repels the shark that is trying to attack the captured fish. can do.

Further, for example, Patent Document 2 is known as a device showing a detailed configuration of an apparatus for generating an electric pulse between a plurality of electrodes. This device is installed after the AC power supply, the high-voltage transformer that boosts the AC power supply to a predetermined high voltage, the rectifying circuit that is attached to the output side of the high-voltage transformer and converts the AC voltage to DC voltage, and the rectifying circuit. , A charging thylister that operates on and off by the gate voltage, a capacitor that temporarily stores the power output from the charging thylister, and a discharging thylister that is placed after the capacitor and operates on and off by the gate voltage. It is provided with a coil connected to the rear side of the discharge thylister and a plurality of electrodes connected to the output side of the coil and arranged in water at regular intervals. Then, the gate voltage is supplied to the charging thyristor and the discharging thyristor at a desired timing, and the on / off of each thyristor is controlled to control the charging voltage value to the capacitor and the charging / discharging timing of the capacitor. It generates an electric pulse between the electrodes.

Japanese Unexamined Patent Publication No. 2006-149275 Japanese Patent No. 3188864

By the way, the device of Patent Document 2 has a large input current from a power source, and when it is used by attaching it to a fishing boat or the like, for example, even if a battery having a relatively large capacity is used, the continuous use time cannot be so long. I have.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a shark repellent device capable of significantly extending the time that can be used continuously as compared with the conventional case. To do.

The present invention is a shark repellent device that applies a voltage from an electric circuit to generate an electric pulse between a plurality of electrodes installed in water, and the electric circuit includes a power source that generates a DC or AC voltage and the power supply. A booster circuit arranged on the output side of the power supply, a rectifier circuit rectifying the AC voltage boosted by the booster circuit to a DC voltage, and a first rectifier circuit arranged on the output side of the rectifier circuit through which current flows from the rectifier circuit. A capacitor, a first connection path connecting the rectifier circuit and the first capacitor, a second connection path connecting the rectifier circuit and the first capacitor separately from the first connection path, and the said A second capacitor arranged on the output side of the first capacitor and flowing a current discharged from the first capacitor, a third connection path connecting the first capacitor and the second capacitor, the second capacitor and the electrode. It is provided with an output circuit arranged between the second capacitor and applying a voltage to the electrode, and the first connection path turns on the first resistor and the current flowing through the first capacitor. The second connection path includes a first switch circuit for turning off, the second connection path includes a second resistor, and a second switch circuit for turning on / off the current flowing through the first capacitor, and the third connection path includes. The first resistor includes a third resistor and a third switch circuit that turns on / off the current flowing through the second capacitor. The first resistor has a larger resistance value than the second resistor, and the first capacitor has a larger resistance value than the second resistor. Is a shark repellent device having a larger capacitance than the second capacitor.

Here, the first capacitor is preferably an electrolytic capacitor.

Further, the electric circuit performs a first capacitor main charging step in which the first switch circuit is turned on for a predetermined time to charge the first capacitor, and then the first switch circuit is turned off and the second switch is turned off. The first capacitor sub-charging step in which the circuit is turned on to charge the first capacitor, and the second switch circuit is turned off and the third switch circuit is turned on to charge the second capacitor by the first capacitor. It is preferable that the second capacitor charging step of performing the above is repeated at least once, and then the second capacitor discharging step of discharging the second capacitor by the output circuit is performed.

The output circuit is the second capacitor performed next with respect to the polarity of the voltage applied to the first electrode, which is one of the plurality of electrodes, in the second capacitor discharging step performed immediately before. In the discharge process, it is preferable to configure it as an output voltage polarity switching circuit that switches and applies the polarity.

The electric circuit of the shark repellent device in the present invention is provided with two capacitors, a first capacitor through which the current from the rectifier circuit flows and a second capacitor through which the current discharged from the first capacitor flows, and the charge accumulated in the first capacitor is collected. A voltage is applied between a plurality of electrodes by accumulating it in a second capacitor and discharging it. Further, the rectifier circuit and the first capacitor are connected by a second connection path connecting them separately from the first connection path and the first connection path, and the first resistor and the first are connected to the first connection path. A switch circuit is provided, and a second resistor and a second switch circuit are provided in the second connection path. Further, the first resistor has a larger resistance value than the second resistor, and the first capacitor has a larger capacitance than the second capacitor. According to such a configuration, since the electric charge can be accumulated in the first capacitor in advance by the first connection path with a small current, the time that can be continuously used is longer than that of the conventional device having a large input current. It is possible to extend it significantly, and it is possible to secure a long operating time when fishing. Further, the first capacitor can store more electric charge than the second capacitor, and the electric charge reduced by supplying the electric charge to the second capacitor is shorter than that of the first connecting path by the second connecting path. Since it can be charged, it is possible to supply a sufficient electric charge to the second capacitor, and it is possible to continue to generate electric pulses at predetermined intervals.

Here, it is preferable to use an electrolytic capacitor as the first capacitor. In this case, even if the capacitor has a large capacitance, a small capacitor can be used, so that the size of the apparatus can be reduced.

Further, the electric circuit performs a first capacitor main charging step in which the first switch circuit is turned on for a predetermined time to charge the first capacitor, and then the first switch circuit is turned off and the second switch circuit is turned on. The first capacitor sub-charging step of charging the first capacitor and the second capacitor charging step of charging the second capacitor with the first capacitor are repeated at least once, and then the second capacitor is discharged by the output circuit. It is preferable to perform the two-capacitor discharge step. In this case, even if the charge of the first capacitor accumulated in the first capacitor main charging step flows to the second capacitor, the corresponding charge is transferred to the first capacitor sub. It can be supplemented in a short time by the charging process.

Further, the output circuit is applied to the first electrode, which is one of the plurality of electrodes, with respect to the polarity of the voltage applied in the second capacitor discharging step performed immediately before, in the second capacitor discharging step performed next. When configured as an output voltage polarity switching circuit that switches and applies the polarity, it is possible to change the direction in which the current flows and effectively give an electrical impact to the shark approaching from any direction.

It is a block diagram which shows one Embodiment of the shark repellent apparatus which follows this invention. It is a figure which shows the voltage waveform in each part of the block diagram shown in FIG. It is a figure which shows the current waveform in each part of the block diagram shown in FIG. It is a block diagram of a shark repellent device which is a comparative example. It is a figure which shows the voltage waveform and the current waveform in each part of the block diagram shown in FIG.

Hereinafter, an embodiment of the shark repellent device according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a shark repellent device according to the present invention. The shark repellent device of the present embodiment includes an electric circuit 1 and a plurality of electrodes 2 connected to the electric circuit 1 and installed in the seawater W. In the present embodiment, two electrodes (first electrode 2a and second electrode 2b) are provided, but the number of electrodes 2 may be three or more. In the present embodiment, by driving the electric circuit 1, an electric pulse having a maximum output voltage of ± 1000 V is generated between the electrodes of the first electrode 2a and the second electrode 2b every 0.5 seconds. .. It is assumed that the load resistance between the first electrode 2a and the second electrode 2b is 10Ω.

The electric circuit 1 includes a power supply 3 that generates a DC or AC voltage. Various power sources 3 can be adopted, and in the present embodiment, a battery of 24 V DC and 40 Ah will be used as an example.

A booster circuit 4 is provided on the output side of the power supply 3. The booster circuit 4 is provided with a transformer or the like, and can boost the voltage supplied from the power supply 3 so that the output voltage becomes, for example, about 1100 V.

Further, on the output side of the booster circuit 4, a rectifier circuit 5 for rectifying the boosted AC voltage to a DC voltage is provided.

A first capacitor 6 is provided on the output side of the rectifier circuit 5. As the first capacitor 6, a capacitor having a larger capacitance than the second capacitor described later is used. As the first capacitor 6 of the present embodiment, a capacitor having a capacitance of about 1000 μF is used. Further, as the first capacitor 6, a ceramic or a plastic film may be used as a dielectric, but in the present embodiment, an electrolytic capacitor is used. As a result, it is possible to reduce the size while having a large capacitance.

Here, the rectifier circuit 5 and the first capacitor 6 are connected by a first connection path 7. Further, the rectifier circuit 5 and the first capacitor 6 are also connected by a second connection path 8 connecting them separately from the first connection path 7.

The first connection path 7 is provided with a first resistor 9 and a first switch circuit 10 for turning on / off the current flowing through the first capacitor 6. Further, the second connection path 8 is provided with a second resistor 11 and a second switch circuit 12 for turning on / off the current flowing through the first capacitor 6. As the first resistor 9, a resistor having a resistance value larger than that of the second resistor 11 is used. In the present embodiment, the first resistor 9 has a resistance value of about 10 kΩ, and the second resistor 11 has a resistance value of about 500 Ω. As a result, the current is less likely to flow in the first connection path 7 than in the second connection path 8. Further, the first switch circuit 10 and the second switch circuit 12 are also connected to the ON time control circuit 13, and the ON / OFF time of the first switch circuit 10 and the ON / OFF time of the second switch circuit 12 are set. , It is configured so that it can be controlled by the ON time control circuit 13.

A second capacitor 14 is provided on the output side of the first capacitor 6. As the second capacitor 14, a capacitor having a capacitance smaller than that of the first capacitor 6 is used. In this embodiment, a capacitor having a capacitance of about 100 μF is selected so that the capacitance of the first capacitor 6 is about 10 times that of the second capacitor 14. Further, as the second capacitor 14, various capacitors using a ceramic or plastic film as a dielectric can be used, but those having a small dielectric loss tangent (tan delta) are preferable. In this embodiment, polypropylene is used as the dielectric.

The first capacitor 6 and the second capacitor 14 are connected by a third connection path 15. Further, the third connection path 15 is provided with a third resistor 16 and a third switch circuit 17 for turning on / off the current flowing through the second capacitor 14. The resistance value of the third resistor 16 is about 3 kΩ in this embodiment. Further, the third switch circuit 17 is also connected to the ON time control circuit 13 like the first switch circuit 10 and the second switch circuit 12, and the ON / OFF time of the third switch circuit 17 is the ON time control circuit. It can be controlled by 13.

An output circuit 18 is provided between the second capacitor 14 and the electrode 2 to discharge the second capacitor 14 and apply a voltage to the electrode 2. The output circuit 18 is composed of, for example, one thyristor arranged between the second capacitor 14 and the electrode 2. In this case, the output circuit 18 is stored in the second capacitor 14 by inputting a gate signal to the thyristor. The charged charge can be passed through the electrode 2.

The output circuit 18 in the present embodiment is configured as an output voltage polarity switching circuit in which the polarity of the voltage applied to the first electrode 2a and the second electrode 2b is switched to a positive electrode or a negative electrode. Specifically, the first thyristor 19 and the second thyristor 19 which connect one end side of the second capacitor 14 and the first electrode 2a and allow a current to flow from the second capacitor 14 toward the first electrode 2a. A second thyristor 20 that connects one end side of the capacitor 14 and the second electrode 2b and allows a current to flow from the second capacitor 14 toward the second electrode 2b, and the other end side of the second capacitor 14. A third thyristor 21 that connects the first electrode 2a and allows current to flow from the first electrode 2a toward the second capacitor 14, and the other end side of the second capacitor 14 and the second electrode 2b are connected to each other. It is provided with a fourth thylister 22 that is connected and allows current to flow from the second electrode 2b toward the second capacitor 14. Further, the first thyristor 19 to the fourth thyristor 22 are connected to a gate signal generation circuit 23 capable of individually inputting a gate signal to them. Here, the gate signal generation circuit 23 is also connected to the above-mentioned ON time control circuit 13. A detailed description of the polarity switching will be described later.

In the shark repellent device having such a configuration, the first switch circuit 10 is turned on in a state where the second switch circuit 12 is turned off and the third switch circuit 17 is also turned off by a command from the ON time control circuit 13. To. As a result, a current flows through the first capacitor 6 via the first resistor 9 and the first switch circuit 10. Here, the output voltage in the rectifying circuit 5 is Vc, the resistance value of the first resistor 9 is R1, the capacitance of the first capacitor 6 is C1, and the time elapsed since the first switch circuit 10 is turned on is T. In this case, V1 which is the voltage between the electrodes of the first capacitor 6 is represented by the following equation (1).

Equation (1): V1 = Vc × (1-EXP ((-1 / (C1 × R1)) × T))

Further, the ON / OFF timing in the first switch circuit 10 at this time is shown in FIG. 2A, and the voltage waveform of the voltage V1 between the electrodes of the first capacitor 6 is shown in FIG. 2B.

The input current Iin input from the power supply 3 to the booster circuit 4 is represented by the following equation (2) when the winding ratio of the transformer used in the booster circuit 4 is N.

Equation (2): Iin = N × (Vc-V1) / R1

Further, the current waveform of the input current Iin from the power supply 3 at this time is shown in FIG. 3 (b). Note that FIG. 3A is the same diagram as FIG. 2A, and shows the ON / OFF timing in the first switch circuit 10. Further, in FIGS. 2 (a) and 2 (b) and 3 (a) and 3 (b), the time when the first switch circuit 10 is switched from OFF to ON is set to 0 seconds, and the first switch circuit 10 is turned OFF from there. It shows until switching. Here, the step of charging the first capacitor 6 with the first switch circuit 10 turned on for a predetermined time (25 seconds in this embodiment) is referred to as a first capacitor main charging step. The average input current when the first switch circuit 10 is in the ON state for 25 seconds is about 2A.

Next, the first switch circuit 10 is turned off and the second switch circuit 12 is turned on (the third switch circuit 17 remains OFF), and the t1 hour (t1 hour) via the second resistor 11 and the second switch circuit 12 (the third switch circuit 17 remains OFF). In this embodiment, a current is passed through the first capacitor 6 (for 0.07 seconds) to charge the first capacitor 6. Here, this step is referred to as a first capacitor sub-charging step (first time). After this step, the first switch circuit 10 is left OFF. 2 (c) and 3 (c) show the ON / OFF timing in the second switch circuit 12, and FIGS. 2 (d) and 3 (d) show the ON / OFF timing in the third switch circuit 17. It shall indicate the timing.

Here, the resistance value of the second resistor 11 is R2, the time elapsed since the first switch circuit 10 is turned off and the second switch circuit 12 is turned on is T, and immediately before the first switch circuit 10 is turned off. When the voltage between the electrodes of the first capacitor 6 is V01max, V1 which is the voltage between the electrodes of the first capacitor 6 at t1 time is represented by the following equation (3). The input current Iin input from the power supply 3 to the booster circuit 4 in t1 hour is represented by the following equation (4).

Equation (3): V1 = Vc × (1-EXP ((-1 / (C1 × R2)) × T)) + V01max
Equation (4): Iin = N × (Vc-V1) / R2

Further, the voltage waveform of V1 which is the voltage between the electrodes of the first capacitor 6 in t1 hour is shown in FIG. 2 (e), and the current waveform of the input current Iin input from the power supply 3 to the booster circuit 4 in t1 hour is shown in FIG. It is shown in 3 (e).

After that, the second switch circuit 12 is turned off and the third switch circuit 17 is turned on, and the first capacitor 6 is passed through the third resistor 16 and the third switch circuit 17 for t2 hours (0 in this embodiment). .1 second) A current is passed through the second capacitor 14 to charge the second capacitor 14. This step is referred to as a second capacitor charging step (first time).

Here, the resistance value of the third resistor 16 is R3, the capacitance of the second capacitor 14 is C2, the second switch circuit 12 is turned off, and the time elapsed since the third switch circuit 17 is turned on is T. When the voltage between the electrodes of the first capacitor 6 immediately before turning off the second switch circuit 12 is V1max, V1 which is the voltage between the electrodes of the first capacitor 6 at t2 hours is expressed by the following equation (5). It is represented by. V2, which is the voltage between the electrodes of the second capacitor 14 at t2 hours, is represented by the following equation (6).

Equation (5): V1 = V1max × EXP ((-1 / (C1 × R3)) × T)
Equation (6): V2 = V1 × (1-EXP ((-1 / (C2 × R3)) × T))

Further, the voltage waveform of V1 which is the voltage between the electrodes of the first capacitor 6 in t2 time is shown in FIG. 2 (e), and the voltage waveform of V2 which is the voltage between the electrodes of the second capacitor 14 in t2 time is shown in FIG. It is shown in (f). As shown in FIG. 3E, the input current Iin input from the power supply 3 to the booster circuit 4 hardly flows in t2 hours.

After that, the third switch circuit 17 is turned off and the second switch circuit 12 is turned on, and t3 hours (0.02 seconds in this embodiment) via the second resistor 11 and the second switch circuit 12. A current is passed through the 1st capacitor 6 to charge the 1st capacitor 6. Here, this step is referred to as a first capacitor sub-charging step (second time).

Here, the time elapsed since the third switch circuit 17 is turned off and the second switch circuit 12 is turned on is T, and the voltage between the electrodes of the first capacitor 6 immediately before the third switch circuit 17 is turned off is set. When V1min is used, V1 which is the voltage between the electrodes of the first capacitor 6 at t3 hours is represented by the following equation (7). The input current Iin input from the power supply 3 to the booster circuit 4 at t3 hours is represented by the following equation (8).

Equation (7): V1 = Vc × (1-EXP ((-1 / (C1 × R1)) × T)) + V1min
Equation (8): Iin = N × (Vc-V1) / R1

Further, the voltage waveform of V1 which is the voltage between the electrodes of the first capacitor 6 in t3 time is shown in FIG. 2 (e), and the current waveform of the input current Iin input from the power supply 3 to the booster circuit 4 in t3 time is shown in FIG. It is shown in 3 (e).

Next, the second switch circuit 12 is turned off and the third switch circuit 17 is turned on, and the first capacitor 6 is passed through the third resistor 16 and the third switch circuit 17 for t4 hours (0. A current is passed through the second capacitor 14 (for 3 seconds) to charge the second capacitor 14. This step is referred to as a second capacitor charging step (second time).

Here, the time elapsed since the second switch circuit 12 is turned off and the third switch circuit 17 is turned on is T, and the voltage between the electrodes of the first capacitor 6 immediately before the second switch circuit 12 is turned off is set. When V1max is used, V1 which is the voltage between the electrodes of the first capacitor 6 at t4 hours is represented by the above equation (5). V2, which is the voltage between the electrodes of the second capacitor 14 at t4 hours, is represented by the above equation (6).

Further, the voltage waveform of V1 which is the voltage between the electrodes of the first capacitor 6 at t4 hours is shown in FIG. 2 (e), and the voltage waveform of V2 which is the voltage between the electrodes of the second capacitor 14 at t4 hours is shown in FIG. It is shown in (f). As shown in FIG. 3E, the input current Iin input from the power supply 3 to the booster circuit 4 hardly flows in t4 hours.

In this way, most of the input current Iin input from the power supply 3 to the booster circuit 4 during the t1 to t4 hours flows only when the second switch circuit 12 is turned on. The average input current when the second switch circuit 12 is turned on in t1 to t4 hours is about 0.5 A.

After that, the third switch circuit 17 is turned off, and the gate signal is input to the first thyristor 19 to the fourth thyristor 22 by a command from the gate signal generation circuit 23. In the present embodiment, a gate signal is input to the first thyristor 19 and the fourth thyristor 22, and the charge accumulated in the second capacitor 14 via the first thyristor 19 and the fourth thyristor 22 is charged for t5 hours (in the present embodiment). By discharging to the first electrode 2a and the second electrode 2b for 0.01 seconds), an electric pulse is generated between the first electrode 2a and the second electrode 2b. This process is referred to as a second capacitor discharge process. Further, the voltage waveform of the output voltage Vout applied to the first electrode 2a and the second electrode 2b at t5 hours is shown in FIG. 2 (g).

After that, the above-mentioned first capacitor sub-charging step (first time), second capacitor charging step (first time), first capacitor sub-charging step (second time), and second capacitor charging step (second time) are performed. The second capacitor 14 is charged. Then, by inputting a gate signal to the second thyristor 20 and the third thyristor 21 by a command from the gate signal generation circuit 23, the polarity is switched from the immediately preceding second capacitor discharge step as shown in FIG. 2 (g). Therefore, an electric pulse can be generated between the first electrode 2a and the second electrode 2b.

Since such a shark repellent device can suppress the average input current from the power supply 3, the time during which it can be used continuously can be significantly extended. In order to clarify this point, it will be described with reference to comparative examples. FIG. 4 is a block diagram of the shark repellent device 100 shown as a comparative example. The parts common to the above-mentioned shark repellent device are designated by the same reference numerals in the drawings.

In the comparative example, the second capacitor 14 is charged by the current flowing from the rectifier circuit 5 by turning on the third switch circuit 17. Then, a gate signal is input to the first thyristor 19 to the fourth thyristor 22 by a command from the gate signal generation circuit 23, and the electric charge accumulated in the second capacitor 14 is discharged to be between the first electrode 2a and the second electrode 2b. Is designed to generate an electric pulse.

Here, the ON / OFF timing of the third switch circuit 17 in the comparative example is shown in FIG. 5 (a). Further, FIG. 5B shows a voltage waveform of V2 which is a voltage between the electrodes of the second capacitor 14, and FIG. 5C shows an output voltage Vout applied to the first electrode 2a and the second electrode 2b. The voltage waveform is shown, and FIG. 5D shows the current waveform of the input current Iin input from the power supply 3 to the booster circuit 4.

In the comparative example, the peak of the input current Iin input from the power supply 3 to the booster circuit 4 is about 21 A, and the average input current is about 8 A. That is, when a 40 Ah battery is used as the power source 3, the time during which the shark repellent device of the comparative example can be continuously used is about 5 hours. For this reason, when fishing, it may not be possible to use it during all operating hours. On the other hand, in the shark repellent device of the present embodiment, the current (about the average input current is about) smaller than that of the comparative example in a very short time (25 seconds) when the first switch circuit 10 is turned on and the first capacitor 6 is charged for the first time. Only about 2A) flows, and in the subsequent continuous use, about 0.5A flows at the average input current. Therefore, when a 40 Ah battery is used as the power source 3, it can be used continuously for about 80 hours. Further, when using the shark repellent device of the present embodiment, if it is not necessary to lengthen the continuous use time so much, a battery having a small capacity can be used, so that the device can be miniaturized. Further, the second capacitor 14 is repeatedly charged and discharged, but in the present embodiment, since a polypropylene having a small dielectric loss tangent (tandelta) is used, the influence of heat generation can be suppressed.

The shark repellent device according to the present invention has been described above while showing specific embodiments, but the shark repellent device according to the present invention is not limited to the above-described embodiment, and various modifications are made within the scope of the claims. Is also included. For example, the above-mentioned first resistor 9 has a resistance value about 20 times that of the second resistor 11, but as an example, it may be arbitrarily selected within a range of 2 to 40 times. Further, the first capacitor 6 has a capacitance of about 10 times that of the second capacitor 14, but as an example, it may be arbitrarily selected within a range of 2 to 20 times. Further, in the above-mentioned place, the first capacitor sub-charging step and the second capacitor charging step are repeated twice, and then the second capacitor discharging step is performed, but the repetition may be once or three times or more. Furthermore, the polarity is not limited to being switched each time an electric pulse is output, and the polarity may be switched at any number of times of two or more times, or the polarity remains the same for each electrode without switching the polarity. An electric pulse may be output.

1: Electric circuit 2: Electrode 2a: 1st electrode 2b: 2nd electrode 3: Power supply 4: Booster circuit 5: Rectifier circuit 6: 1st capacitor 7: 1st connection path 8: 2nd connection path 9: 1st resistor Instrument 10: 1st switch circuit 11: 2nd resistor 12: 2nd switch circuit 13: ON time control circuit 14: 2nd capacitor 15: 3rd connection path 16: 3rd resistor 17: 3rd switch circuit 18: Output circuit (output voltage polarity switching circuit)
19: 1st thyristor 20: 2nd thyristor 21: 3rd thyristor 22: 4th thyristor 23: Gate signal generation circuit

Claims (4)

A shark repellent device that applies voltage from an electric circuit to generate electrical pulses between multiple electrodes installed in water.
The electric circuit includes a power supply that generates a DC or AC voltage, a booster circuit that is arranged on the output side of the power supply, a rectifier circuit that rectifies the AC voltage boosted by the booster circuit to a DC voltage, and the rectifier circuit. A first capacitor arranged on the output side of the above and through which a current from the rectifier circuit flows, a first connection path connecting the rectifier circuit and the first capacitor, and the rectifier circuit different from the first connection path. A second connection path connecting the first capacitor and the first capacitor, a second capacitor arranged on the output side of the first capacitor and a current discharged from the first capacitor flowing through the first capacitor, and the first capacitor and the second capacitor. It is provided with a third connection path for connecting the second capacitor and an output circuit arranged between the second capacitor and the electrode to discharge the second capacitor and apply a voltage to the electrode.
The first connection path includes a first resistor and a first switch circuit that turns on / off the current flowing through the first capacitor.
The second connection path includes a second resistor and a second switch circuit that turns on / off the current flowing through the first capacitor.
The third connection path includes a third resistor and a third switch circuit that turns on / off the current flowing through the second capacitor.
The first resistor has a larger resistance value than the second resistor, and the first capacitor is a shark repellent device having a larger capacitance than the second capacitor. The shark repellent device according to claim 1, wherein the first capacitor is an electrolytic capacitor. The electric circuit performs a first capacitor main charging step in which the first switch circuit is turned on for a predetermined time to charge the first capacitor, and then the first switch circuit is turned off and the second switch circuit is turned off. The first capacitor sub-charging step of charging the first capacitor by turning on, and the second capacitor of the second capacitor being charged by the first capacitor by turning off the second switch circuit and turning on the third switch circuit. The shark repellent device according to claim 1 or 2, wherein the second capacitor charging step is repeated at least once, and then the second capacitor discharging step of discharging the second capacitor is performed by the output circuit. .. The output circuit is the second capacitor performed next with respect to the polarity of the voltage applied to the first electrode, which is one of the plurality of electrodes, in the second capacitor discharging step performed immediately before. The shark repellent device according to claim 3, which is configured as an output voltage polarity switching circuit that switches and applies the polarity in the discharge step.

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