Page 327 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

one of the two control devices is operative and so this bridge is called single-phase full- wave half-controlled
bridge. In this circuit, freehweeling action (when the load is inductive) is done by the pair of diodes D and D . So,
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there is no need of separate diode for this purpose.

Single Phase Full Wave Fully Controlled Bridge

The circuit diagram of single-phase full-wave fully controlled bridge is shown in Fig. A full- wave bridge rectifier is
formed with the help of four diodes D , D , D and D . Only one SCR is used as the control device. D.C. output is
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available in both the halves of the a.c. input cycle. The d.c. output can be controlled by varying the firing angle of
the SCR. Diode D5 is used for freewheeling purpose.

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CITS : E & H - Electronics Mechanic - Lesson 199 - 204