VHF15-08I05 IXYS Power supply module

The VHF15-08I05 is an integrated power module, designed to simplify the construction of single-phase controlled rectifiers. It combines two key elements within a single, compact package:

Half-Controlled Bridge: This consists of a combination of Thyristors (SCRs) and Diodes configured in a bridge arrangement. This "half-controlled" nature means that the output DC voltage can be varied by controlling the firing angle of the thyristors, offering a level of control over the rectified output that a simple diode bridge cannot, yet being less complex than a full-thyristor bridge. This makes it suitable for applications requiring adjustable DC voltage.

Integrated Freewheeling Diode: A crucial feature is the inclusion of a built-in freewheeling diode connected across the DC output. This diode provides a bypass path for inductive load currents when the main rectifying devices turn off. This action is vital for inductive loads (like DC motor armatures or electromagnets) as it prevents damaging voltage spikes, improves the overall efficiency of the circuit by recovering reactive energy, and minimizes electromagnetic interference (EMI).