Mikä on korkeajännitteisen säädettävän DC-virtalähteen periaate
Korkealla jännitteellä säädettävä tasavirtasäädettävä virtalähdepiiri sopii diodille, triodirajajännitteelle, neonpolttimolle, loistelampun käynnistysjännitteelle, kondensaattorin käyttöjännitteelle, virralle jne. Piiri voidaan asettaa välille 3 - 2000 V.
The square wave generator consists of IC2 (NE555) and its peripheral components, and the square wave frequency is 20 kHz. The square wave signal is output from pin ③ of IC2, amplified by the power amplifier tube VT, output to the primary winding L1 of the pulse transformer T, and then coupled to the secondary side L2 by the transformer, rectified by the diode VD2 and charged to C3. The peak value of the DC voltage at C3 is 2kV.
IC1a and related components form a voltage comparator, and VD2 provides a reference voltage of 0.7 V for the non-inverting connection ③ pin. The comparison voltage is obtained from the point VE, and the voltage of the divided point A is transferred to the inverting terminal of IC1a through the voltage follower IC through the point A of the voltage dividers R1 and R2. During operation, when VF goes low in VaVB, IC2 stops oscillating, and when the voltage of C3 drops again, it becomes VA.
The DC output voltage is output from both ends of X1 and X2 in the circuit as the interface of the device under test. IC is LM324 and IC2 is NE555. The reverse voltage of VD1 is over 2000V and VD2 is any kind of silicon rectifier. The iron core of the pulse transformer T is made of ferrite material, and the size is E-7. When winding, first wrap L1 with 0.17mm enameled wire for 30 turns, and then wrap with 0.09mm enameled wire until L2 is full (about 1200 turns). L1 and L2 are used for winding, and polyethylene film is added between the layers. The two leads of L2 should be separated. The withstand voltage of capacitor C3 is above 2000V, and high-voltage ceramic capacitor C404M can be used. For B>100 of VT, Icm>700 mA, valittavissa on 3DG130, 8050 jne. Jos lähtöjännite on vain 40-50 V virheenkorjauksen aikana, vaihda vain L2:n kaksi päätä.
