Machine vision illumination stabilizer

Posted on Aug 23, 2012

The combination of Ql, Q2 and Ul form a hysteresis oscillator to stabilize lamp illumination. In operation, full wave bridge D3 operates directly from the ac line to supply unregulated dc to the lamp and also to the 10 V zener that provides power to the quad CMOS Schmitt trigger, Ul. When the lamp supply exceeds 115 V, Ql is turned ON, charging Cl through R2 to raise the input to Ula past the positive-going logic threshold. This drops the output voltage at Ulc and Uld, which drives the gate of Q2, turning it OFF.

Machine vision illumination stabilizer
Click here to download the full size of the above Circuit.

Current then decays through the lamp, LI and D3 until the lamp voltage falls below 115 V, at which time Ql turns OFF and the cycle repeats.

Leave Comment

characters left:

New Circuits



Popular Circuits

RF Dummy load
Crossover For Subwoofer
home built laser system
Flyback Transformer Drivers
Mini High-Voltage Generator
DZW75-48/5050II input circuit
Amp It Up!
Output by the CS3843 and CS5101 composed of 5V 3.3V switching DC power supply circuit
Recording circuit of phone conversations using PC