초록 ▼

A power supply for an arc lamp comprises a power source and an inverter, the power source being a constant current source and the inverter a bridge network of field effect transistors switched by square wave pulses from an oscillator so that the output of the bridge network comprises alternating squ

A power supply for an arc lamp comprises a power source and an inverter, the power source being a constant current source and the inverter a bridge network of field effect transistors switched by square wave pulses from an oscillator so that the output of the bridge network comprises alternating square wave pulses of equal duration for driving the lamp. The oscillator pulses are fed by way of opto-isolators to the bridge transistors. The constant current source and bridge network are provided as a power module for parallel connection with like modules and the oscillator is of modular form and serves as a common oscillator for the power modules.

대표청구항 ▼

A power supply for an arc lamp, comprising a power source and an inverter, characterized in that the power source is a constant current source for the supply of current to the inverter and comprises, connected in series, a rectifier, a capacitor, an inductor and a field effect transistor, the invert

A power supply for an arc lamp, comprising a power source and an inverter, characterized in that the power source is a constant current source for the supply of current to the inverter and comprises, connected in series, a rectifier, a capacitor, an inductor and a field effect transistor, the inverter being connected in parallel with said capacitor so that current supplied from the rectifier to the inverter is drawn through said inductor by said field effect transistor, there being provided a chopper oscillator for controlling conduction of said field effect transistor and means connected to said oscillator and responsive to the current in said field effect transistor so that said oscillator is inhibited to terminate conduction of said field effect transistor when the current therethrough exceeds a predetermined value, whilst the inverter comprises a bridge network of field effect transistors and an oscillator adapted to supply square wave switching pulses to the bridge transistors, whereby the bridge network affords an output current of alternating square pulses of current of equal duration for driving the lamp.