Production of light-controlled electronic insect killer lamp

The electronic insect killer lamp circuit consists of a light-controlled switch circuit and a voltage-doubler rectifier circuit, as shown in the figure.

In the circuit, the light-controlled switch circuit is composed of a photoresistor RG, a capacitor CO, a lamp EL, a resistor R, a bidirectional trigger diode V and a thyristor VT; the voltage-doubler rectifier circuit is composed of capacitors C1-C5 and rectifier diodes VD1-V D5.

During the day, RG is exposed to light and is in a low-resistance state, short-circuiting CO, VT has no trigger voltage and is in a cut-off state, and the voltage-doubler rectifier circuit does not work. At night when there is no light, RG returns to a high-resistance state, and the AC 220V voltage charges CO through EL and R. When the voltage on CO is charged to a certain value, V is turned on, causing VT to be triggered and turned on, and the voltage-doubler rectifier circuit is powered on and works. After the AC 220V voltage is doubled and rectified five times by the voltage-doubler rectifier circuit, a high voltage of about 1450V is generated and added to the power grid. When pests fly towards the light and touch the power grid, they will be immediately killed by the high voltage.

The electronic insect killer lamp circuit introduced in this example also uses the phototaxis of moths and other pests to catch and kill pests by light luring and high voltage electric shock. The device can automatically turn on at night and turn off during the day.

Component selection R uses a 1W metal film resistor.

RG uses MGL series photoresistors, whose light resistance should be less than or equal to 3 kΩ and dark resistance should be greater than or equal to 5 MΩ.

CO uses a polyester capacitor with a withstand voltage of 160V; C1-C5 all use high-voltage paper capacitors or CBB capacitors with a withstand voltage of 600V.

VD1-VD5 all use 1N4007 silicon rectifier diodes.

V uses a DB3 or 2CTS series bidirectional trigger diode.

VT uses 3 CTS3/600 V or TCL336A (3A, 600V) bidirectional thyristor.

EL uses 3W white cold cathode lamp.

The electric grid is made of two layers of metal wire mesh: the inner layer has a smaller wire spacing (about 2mm), which is used to kill smaller pests such as black-tailed leafhoppers, rice thrips, rice planthoppers, white-winged leafhoppers, etc.; the outer layer has a larger wire spacing (about 10mm), which is used to kill larger pests such as the rice borer, striped stem borer, yellow stem borer, and silkworm.