Commonly used industrial ignition circuits

The industrial electronic igniter circuit consists of a power supply circuit, a starting ignition control circuit and a boost ignition circuit, as shown in Figure 7-9.
The power circuit consists of power switch Sl, fuse FU, and step-down capacitor C. , bleeder resistor R, rectifier diode VD1, Zener diode vs
and filter capacitor G.
    The starting ignition control circuit consists of the ignition control button S2, resistor ~R, NAND gate integrated circuit IC (D1-D4), thyristor VTH,
intermediate relay KA and capacitors C4 and Cs.
    The boost ignition circuit consists of a boost transformer T, rectifier diodes VD2 ~ VD5, capacitor C3, resistor ~ R4, discharge tube, inductor L and
spark plug.
    Turn on the power switch S1, and apply AC 220V voltage via C. After step-down, vs voltage stabilization, VD1 rectification and C2 filtering, 6V DC
working voltage is provided for 1C root.
    When the ignition control button S2 is pressed, c5 starts charging, NAND gate D; outputs low level, Dl and D2 output high level, causing VTH to be
triggered , KA is powered on and closed, and its normally open contact is connected Operating power supply for the boost ignition circuit. After the AC 220V voltage is boosted by T and rectified by VD2~VD5
, it charges G through Rz. When the voltage across C reaches the breakdown voltage of the discharge tube, the discharge tube breaks down. The electric energy stored on C3
is added to the spark plug through the discharge tube and inductor coil L, and a discharge spark is generated through the spark plug to ignite the fuel or gas.
    When C is fully charged (about 12s), NAND gate D3 outputs high level, Dl and D2 output low level, VTH is cut off when the alternating current crosses zero
, and KA is released, cutting off the working power supply of the boost ignition circuit .