Incandescent Yeonsu switching circuit

This is a type of connection switch designed for incandescent lamps, known as a spider life extension switch. It has two main functions: First, it utilizes electroporation to enable semi-crossing buck starts and fully preheats the filament to transfer it to a full voltage power supply. Second, if the city electric grid voltage exceeds the standard 220V by approximately 20V, the circuit can automatically reduce power to a half-wave, effectively extending the life of the incandescent lamp.

When the switch S is closed, during the negative half-cycle of AC, the power supply passes through components Vn1, R, and VD2 to charge the capacitor. The voltage across the capacitor gradually increases but remains below the threshold voltage required to trigger the thyristor VTH. As a result, the light bulb E does not illuminate during this phase. In the negative half-cycle, current flows through VD3 and R, providing a pull current to trigger VTH, which then opens, allowing the light bulb to receive power and warm up. As time progresses, the voltage across the capacitor rises. Once it exceeds the threshold voltage, VD2 becomes reverse-biased and turns off, allowing current to flow through VD1 and R to provide the necessary trigger current to VTH, thus transitioning to full voltage power state.

The soft start duration is primarily determined by the capacitor's capacitance value. If the grid voltage suddenly spikes and exceeds the preset value, the base of transistor VT1 samples the high voltage, causing it to switch from an off state to a conducting state. This leads to the discharge of the stored charge in VT1, which turns off the circuit and returns to the original power state.

For testing, disconnect VD2 and close switch S; the light bulb E should remain off. Reconnect VD2, and adjust the movable end of RP to place VT1 in the off state. During this adjustment, the light bulb should exhibit a gradual soft start. If the soft start process is too slow, the capacitance of C can be adjusted, and the input AC voltage regulator can be fine-tuned using a small screwdriver to achieve the desired effect.

This circuit serves to enhance the lifespan of incandescent bulbs by providing controlled power delivery and mitigating the effects of voltage spikes, ensuring a gradual warm-up period to prevent filament damage. Proper calibration of the components is essential for optimal performance and reliability.Is another kind of connection switch incandescent spider life extension, it has two functions: First, just by electroporation, can be semi-crossing buck starts, to be fully preheated filament is transferred to full voltage power supply; second, once the city electric grid voltage than standard 220V high value ... about 20V, the circuit can automatically power down to a half-wave, the "effective extension K white incandescent lamp life make H1.

after closing switch S, a half weeks when the AC is - when the power supply through Vn1, R ,, VD2 to the capacitor (seek power, (I-what ends pressure gradually increased, but far below the steady pressure of the pipe vs rJ threshold voltage, vs Chi is off, because there was no trigger current thyristor VTH in the off-state, then the light bulb E AC current flows in the negative. half cycle, the current through VD3, R, to mention VTH touch land for negative pull current, the VTH opened, light bulbs I: there are half-pay Xu electricity to warm up.

as long as C is less than the voltage across the regulator I vS straight, in an alternating cycle of stars, the current flowing through E of only half a cycle, which soft-start drawer lamp. over time the shift, r voltage across the rising, when the rose and exceeded vs voltage value, VD2 reverse bias is turned off, it vs conduction through the power through VD1, r.

VTH to provide trigger current, so the positive half-cycle alternating current star, VTH also opened on, then F enters full voltage power state. this circuit soft start time mainly by the capacitor (capacitance value determination 1. If the grid voltage suddenly knife high and exceeds the circuit did not count value, the transistor VT1 base sampling voltage rise high , wri mountain original flip off state to a conducting state, then (storage charge will VT1 discharge, vs recovery complex off the circuit and return to the original, r wave down wins power state.

Kuai test: disconnect VD2, after closing r S, E should normally stop light. then turned VD2, Po and the RP's spin radially movable end side, so that VT1 into oFF state. At this time powered E can be observed after the first dark light soft start too soft flat dynamic process time t if undesirable, adjustable C capacity is then connected to the input AC voltage regulator circuit of the terminal, the voltage adjusted to about 2-10V, with a small screwdriver to fine-tune RP, just make VT1 As of that observed light bulb F can suddenly go dark.