Patent ID: 6184669
Filing Date: 2001-02-06
Classification: G05F,Y10S

Abstract:
A current control circuit, disposed between a primary terminal and a secondary terminal, for controlling a current flowing from the primary terminal to the secondary terminal, said current control circuit comprising:a first resistance disposed on a current path directed from the primary terminal to the secondary terminal;a MOSFET, in which its drain and source are connected in series to said first resistance, disposed between said first resistance and the secondary terminal, said MOSFET permitting a maximum permissible current or less current to conduct in accordance with a voltage applied to its gate;a PNP transistor in which its emitter is connected to a primary of said first resistance and its base is connected to the secondary of said first resistance; anda voltage drop device, disposed between the collector of said PNP transistor and the gate of said MOSFET, for supplying to the gate of said MOSFET a voltage dropped by a predetermined potential from a voltage of the collector of said PNP transistor.