The circuit principle circuit is shown in Figure 1. The circuit is mainly composed of five parts: oscillation, boost, rectification, trigger and discharge output. R1, C1, R2, D1, D2 and VT and L1, L2 constitute an oscillating circuit. Where L2 is the feedback coil. Its oscillation frequency is about tens of kilohertz. The pulse voltage generated by the oscillation is boosted by L3 induction, and the DC voltage obtained by rectification from D3 to D8 is charged to the storage capacitor C3 via A and B (the ends of A and B are placed in the electrode of seawater through the wire); On the other hand, C2 is also charged via R3. When the voltage across C2 reaches the turn-on voltage of the trigger diode D9. The thyristor SCR is triggered to conduct, and the storage capacitor C3 is discharged to the A and B terminals through the SCR, so that the shrimp between the electrodes in the sea area is stunned by electricity and salvaged. among them. R3, R4, w and C2 form a phase shifting circuit. Adjusting the variable resistor W changes the charging time of C2, thereby controlling the discharge frequency of C3 to achieve the desired shrimp trapping effect.
The component selection oscillating tube VT is a high power tube, which requires BVceo "200V. 1cm"8A. Such as C3995. The area of ​​the radiator should not be less than 75cm2. If there is no such tube. Four 3DDl5D can be used in parallel. But the parameters of the four tubes are required to be as uniform as possible. Avoid the difference in performance of individual tubes and burn out due to uneven heating. R2 selects 10Ω/10W cement resistor: D9 is the trigger diode of breakdown voltage 30V DB3 thyristor SCR selects 20A, 600V pressure type unidirectional thyristor. Such as EGE06-06. C3 uses 25μ, 450V oil immersion capacitors. It is worth mentioning that if this capacitor uses electrolytic capacitors. Ineffective. And easy to damage.
Production and debugging pulse transformer B need to be self-made. The core uses a 21-inch color TV line output transformer core. First make a skeleton with insulating paper, then use the Φ1.2mm enameled wire to make L1 around the skeleton on 24T. Use a 0.7mm enamelled wire to wrap 12T for L2. After winding L2, use insulation paper to wrap two turns for insulation to prevent high-voltage ignition. Then use Φ0.4mm enameled wire to wrap 300T as output coil L3. Winding the wire package. When loading the core. The mating end of the magnetic core is made of 1-2 insulating paper pads, so that the magnetic core has a magnetic gap to prevent magnetic saturation. The ferrite core is easily broken, so when installing the core, it should be slowly inserted into the wire package vertically, and should not be hard knocked to avoid damage to the core.
If the pulsed transformer is wound, if it is conditional, it can be treated by dipping to make it moisture-proof. Improve insulation performance. Connected to the A and B ends are metal bars and fish nets. A 2 meter long bamboo pole can be used as a handcuff. A and B are connected to the metal rod and the fish net through a plurality of rubber threads, as shown in FIG. The fish net ring is made of wire.
Due to the harsh environment used, do not use ordinary iron wire for metal bars and fishnet rings. It is best to use copper wire or stainless steel wire with Φ6mm or more to prevent rust from seriously affecting shrimp catching effect.
After the components are soldered correctly. Do not connect to L3 first, and debug the low-voltage oscillation part. If you hear a "beep" sound. Note that the circuit has started to oscillate and then access L3; if the circuit does not vibrate. The polarity of the feedback coil L2 can be interchanged. After the circuit starts to oscillate, connect to L3 and debug the high voltage part: use 220V, 100W bulb as load and connect to A and B end. At this point, if the light bulb is off. And when the light is bright, the brightness is very large. And issued a "one by one" sound, indicating that the production was basically successful. Adjust w so that the bulb flashes three times every two seconds and you can use it in the sea.
Component list
1. The circuit does not sound and does not hear the "å±å±" oscillation after the power is turned on. Explain that the circuit is stopped. Damage to the oscillating part or short circuit in the high voltage part will cause the circuit to not vibrate. When checking, first disconnect L3, if you hear a "beep" sound. It indicates that there is a short circuit in the high voltage part, and it is important to check whether the thyristor and the storage capacitor are broken. If you do not hear the "beep" sound, the oscillation part is faulty, check the oscillation tube for damage. If the oscillating tube is composed of four 3DDl5D, one of them is damaged. Don't just change the tube. Four tubes should be replaced together to avoid inconsistencies in the parameters of the old and new tubes.
2. No high voltage discharge if the circuit starts to oscillate. But use 220V, lOOW bulb as load, when the bulb does not shine. The L3 connector should be checked for detachment or corrosion, and the thyristor is open. Whether the storage capacitor C3 can be charged and discharged.
3. The discharge frequency is not adjustable. The discharge frequency is too fast or too slow or not adjustable. Both are related to R3, R4, W and C2. A change in one of these components will cause a change in the discharge frequency. Not conducive to catching shrimp. At this time. It should be checked whether the adjustable resistance W is in poor contact, whether the resistance values ​​of R3 and R4 are changed, and whether C2 is damaged or not. This shrimp trap is suitable for shrimp fishing in seawater or saltwater farms. If used in freshwater rivers and rivers to catch shrimp. Appropriately change the number of turns of L3.
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