RC phase bridge
An RC phase bridge is a circuit in electronics for adjusting the ignition angle of thyristors .
An RC phase bridge consists of a transformer that supplies an alternating voltage U. The secondary winding has a center tap. An adjustable resistor R and a capacitor C are connected in series to this transformer .
The resistance R can be adjusted from 0 to ∞. As a result, the phase angle φ of the voltage U_φ can move between 0 and 180 °. This variable angle can be used to control a thyristor.
In general, a phase bridge is used to control the phase position (horizontal shift) of a voltage (with constant amplitude) in relation to a reference voltage.
Alternatively, RL phase bridges are used, which consist of a resistor and an adjustable inductance ( coil ).