Industrial static elimination circuit

In some printing and plastic production processes, a lot of static electricity is generated, which directly affects people's health and pollutes the environment. In order to eliminate the harm to scenic spots,
a static electricity elimination circuit is introduced, which can generate a high-voltage electric field and effectively eliminate static electricity on plastic films and papers.
    (1) Circuit composition The 12V regulated power supply circuit is composed of power transformer Tl, bridge rectifier uc, filter capacitor CI and three-terminal voltage stabilizing integrated circuit
IC1 (see Figure 7-2).
    The pulse boost circuit consists of resistors Ri~Rs, capacitors C2-C5, thyristor VTH, potentiometer RP, diodes VD1~VD3 and a boost transformer
.
    The output voltage indication circuit consists of resistors ~ R13 and light-emitting diodes I. It is composed of ED1～LED 4 and operational amplifier integrated IC2 (Nl～N3)
.
    (2) Circuit principle Turn on the power switch S. The AC 220V voltage passes through the primary winding of Ri, VD2, R2, RP and r2 and is applied to
the two anodes of VTH. The other path passes through the trigger circuit composed of VD1, R5 and G to provide the trigger voltage for the gate of VTH, making VTH at
The conductive state is maintained during both the positive and negative half cycles of the AC voltage. After VTH is turned on. The primary windings of G and Tz form an LC parallel resonant circuit ,
producing an oscillation signal with a frequency of 3kHz. After the oscillation signal is boosted by T2 and rectified by VD3, a high-voltage positive electric field is generated at both ends of 0, and
the plastic film or paper is discharged through the high-voltage electrode to eliminate static electricity. Adjust the resistance of RP to make the output voltage continuously adjustable within 5-15kV.
    The AC z20v voltage is also supplemented with Tl step-down, UR rectification, Cl filtering and IC1 voltage stabilization to provide +12V DC voltage for IC1. +1ZV
voltage via R. - After the current limit, I: day) 4 will be lit, and it will also go through Rl$, Rui, Dao and R. : After series voltage division, it provides the reference
voltage for the inverting input terminal of Nl-N3. The sampling voltage of the positive phase input terminals of N1~N3 comes from terminal A. The higher the output high voltage, the higher the voltage at terminal A, and
the more LED1-LED3 will light up. When the output voltage is 5kV, LED1 lights up; when the output voltage reaches 10kV, LEDl XI LED2 both light up. When the output voltage
reaches 15kV, I. ED1 ~ LED 3 are all on.