GE DS200FGPAG1A Gate Pulse Amplifier Board

GE DS200FGPAG1A Gate Pulse Amplifier Board

Functional Description

The DS200FGPAG1A Gate Pulse Amplifier (FGPA) provides three basic functions for the Load Commutated

Inverter (LCI).

• Gate driver. Each FGPA supplies the gate power for one phase of an SCR bridge. To accomplish this, each

FGPA contains two gate driver circuits. Each gate driver is capable of supplying gate power of sufficient

magnitude and duration to gate from one to six series connected SCR's. Upon receipt of a gating command

via fiber optic link from the LCI control, the gate driver sends gate power to the SCR gates through

isolation CTs (current transformers) located on DS200FHVA cards mounted near the SCRs. (One FHVA per

SCR). The primaries of the isolation CTs are connected in series to ensure simultaneous gating of all SCRs.

• SCR status monitor. The FGPA accumulates cell voltage information from up to 12 FHVAs and relays

this information via an optical serial data link back to the LCI control.

• Switching power supply. The FGPA accepts a power input of 120 Vrms ±20% ac. This input is converted

into the dc control voltages required by the gating and status functions.

Technical Specifications