Circuit arrangement for the power supply of vacuum-fluorescent displays

摘要

A circuit arrangement for the power supply of vacuum-fluorescent displays (VFD) is proposed which is intended to emit a constant anode DC voltage (Ua) and a constant heating AC voltage (Uh) for the operation of the VFD elements (19). For this purpose, the circuit arrangement comprises a power supply section (10), in which only the anode DC voltage (Ua) is coupled back by means of a regulating stage (22) to the DC voltage converter (12), and in which the DC voltage output (13, 14) is furthermore connected to the input of an invertor (22) whose output passes to the AC voltage output (24, 25). Such a circuit arrangement is especially suitable for display-indicating instruments in the cockpit of motor vehicles. <IMAGE>