Electric mosquito swatter is a small household electrical appliance. People widely welcome electronic high-voltage mosquito killer hand swatter because of its practicality, convenience, good mosquito (fly or moth, etc.) effect, no chemical pollution, safety, and hygiene. Gradually become an indispensable tool for summer pest control, and become the best-selling small household appliances in summer.
Introduction of electric mosquito swatter
Electric mosquito swatters mainly use 4V rechargeable high-capacity lead-acid batteries or 2.4v NiMH/NiCd batteries, and dry batteries are also helpful. A high voltage of about 1850V DC is generated between the double-layer power grids through the booster circuit (the current is less than ten mA, which is harmless to humans and animals). The electrostatic field between the two power grids has a strong adsorption force. When pests get close to the grid, they can be sucked into the grid, and the short-circuit current generated will immediately kill them. The high-voltage electricity generated by the electric mosquito swatter can also release a certain amount of negative oxygen ions, which can sterilize and disinfect and purify the air.
How do electric mosquito swatters work?
The circuit of the electric mosquito swatter is mainly composed of three parts:
- A high-frequency oscillation circuit
- The triple voltage rectifier circuit
- High voltage electric shock net DW
When the power switch SB is pressed, the high-frequency oscillator composed of the triode VT and the transformer T is energized to work. The 3V DC power is converted into a high-frequency AC power of about 18kHz, which is boosted to about 800V by T (discharge distance estimation). Then After the diodes VD2~VD4 and capacitors C1~C3 triple voltage rectification, it is raised to about 2500V and added to the metal mesh DW of the mosquito swatter. When mosquitoes and flies touch the high-voltage power grid, the worms cause a short circuit in the power grid, and they will be killed or stunned or killed by current and arc.
In the circuit, the light-emitting diode VD1 and the current limiting resistor R1 constitute an indicator circuit, which is used to indicate the circuit’s on-off state and display the consumption of battery power.
Transistor VT selects a 2N5609 type silicon NPN medium power triode and can also be replaced by typical triodes such as 8050 and 9013. VD1 uses φ3mm red light-emitting diodes, and VD2~VD4 uses 1N4007 silicon rectifier diodes.
R1~R3 all use metal film resistors. High-voltage capacitors (greater than 2kv) are used for C1~C3, and 6mm×6mm vertical micro tact switches are used for SB. G is made of two No. 5 dry batteries in series (with plastic battery holder), and the voltage is 3V.
High-frequency transformer T must be self-made:
- Choose EE19 ferrite core and supporting plastic skeleton (six feet), L1 is wound with φ0.22mm enameled wire for 22 turns.
- L2 is wound with eight turns of the same wire.
- L3 is wound with φ0.07mm enameled wire 2000 turns or so.
Pay attention to the black dotted wire ends, wind the head and tail in sequence, and spare 1~2 turns of high-voltage insulating tape between the windings.
How to use electric mosquito swatter?
The electric mosquito swatter is equipped with a 4V rechargeable high-capacity lead-acid battery. 8-15 hours per charge, can be recharged 400 times, environmental protection, and energy-saving. After charging is completed, pull the switch, you can choose whether to use a lamp to kill mosquitoes and press the button to kill mosquitoes.
For mosquitoes parked on the wall or the mosquito net, press the power switch, the red light is on at this time, face the thin net to the mosquito and approach it gently, the mosquito will be sucked into the space between the two power grids, and then killed, the thin net will face the mosquito. Press the switch, the Panasonic switch, and the mosquitoes will fall; for the mosquitoes flying in the air, press the button, align the thin surface net with it, and wave it.
Kill flies. Due to the high sensitivity of flies, it is necessary to master specific skills when using them.
1. For the flies parked on the plane, hold the mosquito-killing fly swatter in hand, and place the thin surface net against the flies, gently place it on the same plane 20–30 cm away from the flies, press the switch, after the red light is on, Quickly wave the flies, the flies will be sucked between the two grids, and the electric shock will continue for 1-2 seconds, and the flies will be electrocuted.
2. For the flies on the wall, hold the mosquito-killing fly swatter in your hand, face the flies, stick to the wall, and place it 20-30 cm below or on the side of the flies, press the switch, and wave it quickly, the flies will be Inhaled between the two power grids, the flies are electrocuted to death by electric shock for 1–2 seconds.
3. For the flies suspended on the rope in the air, hold the mosquito-killing fly swatter, the thin net faces the flies 20–30 cm, press the switch, and wave quickly, the flies will be sucked into the two power grids, and the electric shock will continue. 1–2 seconds, the fly is electrocuted.
If the flies fall on the table, place the thin-faced net down and place it between the two metal bars of the thin-faced net, press the switch, and move it gently, the pests will be sucked into the trap, turn the handle to make the thin-faced net With the net facing up, the problems can be picked up—no need to pick by hand.
The main advantages of electric mosquito swatter
Triple pressure
The electric mosquito swatter adopts the first triple voltage rectifier and circuit, and the instantaneous output voltage is as high as 2500V, and the mosquito repelling effect is particularly good.
No electricity
The electric mosquito swatter can kill the mosquitoes that are sucking blood, and it is harmless to the human body.
No leakage
The electric mosquito swatter has a particular three-layer mesh structure, making it easy for mosquitoes and flies to enter the net without slipping through it.
Precautions for using electric mosquito swatter
1. When attacking mosquitoes, press the switch, swing the mosquito swatter, and the mosquitoes will be killed with a light touch.
2. Mosquito swatters killed by the net surface, please shake the net to make it fall off, do not rinse with water to prevent short circuit.
3. The climate is humid, the mosquito swatter may absorb moisture without high pressure or become low pressure, and the pernicious effect will decrease. It would help if you used a hairdryer to dry it in time or dry it in the sun, and the impact of the mosquito swatter will automatically recover.
4. The electric mosquito swatter works on DC high voltage and will produce sparks of a certain intensity. Therefore, it is strictly forbidden to use and overhaul in places full of flammable gases and avoid touching the high-voltage power grid with hands or conductive metal rods when electrified to prevent accidents. Electric mosquito swatters are not toys and should not be used by children.
Buying skills of electric mosquito swatter
When purchasing an electric mosquito swatter, first, pay attention to whether there is information such as the implementation standard number, production date, factory address, and manufacturer’s phone number on the outer packaging.
Second, pay attention to whether there is a “lightning” danger sign or a “dangerous high voltage” warning on the electric mosquito swatter.
3. Check whether the instruction manual includes that the appliance should be kept away from children and cannot be used in places where flammable gas or explosive dust may exist and whether there is a detailed description of the cleaning method, cycle, and anti-leakage measures. If “lightning” is used, Whether the flag has a detailed explanation of its meaning, etc.
A good quality electric mosquito swatter can be identified by observing the handle, power grid, and related signs. Genuine electric mosquito swatter handles are primarily engineered plastics with good gloss. In contrast, defective products are often made of recycled plastic secondary processing, which not only has burrs but also has a high possibility of breaking. The power grid of a good-quality electric mosquito swatter is generally a three-layer structure. The distance between adjacent layers is significant, and the power grid seems to be relatively thick. At the same time, the electric mosquito swatters produced by regular manufacturers are marked with the product name, operation method, factory address, factory name, and other information, and the product also comes with a manual.
Repair method of electric mosquito swatter
Switch
The power switch of the electric mosquito swatter is usually a 6x6mm light-touch miniature key switch, which works under the condition of 120-200mA. Due to frequent operations to turn on and off the power supply, it is more likely to be damaged. There are two forms of damage:
(1) The contact is oxidized, the communication is poor, the indicator light is off, and the electric mosquito swatter does not work.
(2) The reed is fatigued, the contacts are sticky, the indicator light is always on, and the electric mosquito swatter will work as soon as the battery is installed. The size of the microswitch is small, and the maintenance is troublesome, so it is generally replaced with a new one.
Step-up transformer
The damage of the step-up transformer is primarily due to the breakdown of the secondary L3 inter-turn insulation, which means that T’s “squeak” audio sound at the moment of power-on cannot be heard, and there is no spark when it touches the metal mesh. Use the multimeter Rxl to measure the everyday resistance at both ends of L3 about 80Ω. If the circuit is open or lower than the average resistance, it will be regarded as damaged. Another inspection method is to use a knife to cut off the copper foil on the secondary side of the transformer and measure both ends of L3 with the AC block of a multimeter. The standard AC voltage reading is about 230V, and if there is no voltage, it is regarded as damaged.
Solder the pins of T, remove the transformer, pull out the black magnetic core, and lift off the outer insulation. Remove the secondary enameled wire, record the number of turns, and then rewind with φ0.08～φ0.12mm QZ type high-strength enameled wire. The enameled wire can be removed from a broken small ceiling fan or a broken low-power power transformer.
Oscillating Tube
The resistance value of the secondary winding L3 of the detection transformer T is 80Ω, which is normal. If there is no 230v voltage at both ends of the L3, most faults are the damage of the oscillating tube VT. Weld the oscillating tube and use a multimeter to test and judge whether it is good or bad. Replace it with the original model S8050, or replace it with NPN transistors such as D467, D468, 9013, etc.
Double voltage rectification
Voltage doubling rectifier capacitors C1 ~ C5, diodes VDL ~ VD5 any one of the components breakdown short circuit or open circuit, will cause no high voltage or insufficient high voltage. The main reason is that the component withstand voltage is inadequate or the electrical properties used are deteriorated. It needs to be checked one by one with a multimeter. Usually, C1 or VDL breakdown is more common. When the capacitor is damaged, replace it with a 333J/630V polyester capacitor; when the diode is damaged, replace it with an lN4007 silicon rectifier.
Battery box and battery
Most of the battery box faults are battery leakage, which causes the positive copper sheet or the negative spring to corrode and oxidize, and the contact is poor, resulting in the electric mosquito swatter not working. Use a knife to scrape off the rust thoroughly. If the electric mosquito swatter is not used for a long time, it is advisable to remove the battery, which is the best way to prevent the electrode from rusting and oxidizing.
The battery will consume power for a long time. If the voltage of each battery is lower than 1V (the indicator LED brightness is dim), it will cause insufficient high voltage and a poor mosquito-killing effect. Replace two new batteries.
Metal net
Long-term use or collision with objects will cause deformation and loosening of high-voltage metal mesh wires, which may cause an instantaneous short circuit and sparks. The user thought he had hit a mosquito, but he did not know that a malfunction had occurred. If the contact short circuit will cause damage to the rectifier element and the transformer, it is necessary to check and maintain it frequently. If the deformed steel wire is found, it needs to be reshaped. If it is loose, it should be fixed with 502 glue after reset.
Other
The indicator light VDL does not light up: in the case of a typical power supply from the battery G, the fault is mostly caused by the poor internal contact of the button switch SB. SB is a 6mm×6mm vertical miniature tact switch. Frequent switching under the condition of 120mA working current is straightforward to cause oxidation and open circuit of the internal contacts. The fault can be eliminated by replacing it with a new one.
VD1 is on, but no high voltage is generated: at this time, the audio “squeak…” sound produced by the transformer T at the moment of power-on cannot be heard, indicating that the oscillation circuit is not working. The cause of the failure is mostly VT damage, and the failure can be eliminated by replacing the 2N5609 or D467 new tube. If you don’t have this kind of tube at hand, you can also use 8050, 9013 NPN triode instead. The effect is good. Suppose it is checked that the VT is not damaged, and it is obviously hot after power-on. In that case, it means that the internal coil of the transformer T (especially the high-voltage coil L3) is broken down and must be rewound with the exact specification of enameled wire. Generally, this kind of fault is rare.
Insufficient high voltage: the reason is that there are capacitors in c1~c3 open circuit or the capacity becomes smaller, or one of the diodes vD2~vD4 is damaged, it must be detected and replaced; in addition, the battery G voltage is insufficient (VDL brightness is significantly reduced) It will also cause The high voltage is not enough, as long as the new battery is replaced, the fault can be eliminated.
