Current regulator having start-up circuitry which is turned off

Details Current regulator having start-up circuitry which is turned off Current regulator having start-up circuitry which is turned off

1995-02-17

1997-09-16

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323901, G05F 330

Patent

active

056684673

ABSTRACT:
A current regulator includes a regulation stage and a start-up stage. The regulation stage has a base bus and an output transistor having a base coupled to the base bus for generating a regulated current. The regulation stage also includes a current maintaining transistor coupled to the base bus for inducing and maintaining an operating current in the base bus in response to a start-up current first being induced in the base bus. The start-up stage includes a start-up transistor coupled to the base bus for inducing the start-up current in the base bus before the current maintaining transistor is turned on. The start-up transistor is turned off by the regulation stage after the current maintaining transistor is maintaining the operating current in the base bus. A method of starting-up a regulator circuit includes the steps of: establishing a base bus; inducing a start-up current in the base bus; inducing an operating current in the base bus; establishing a conduction path between an emitter of a current maintaining transistor and an emitter of a start-up transistor; and gradually increasing a current which flows through the conduction path in order to gradually decrease a current conducted by the start-up transistor in order to turn the start-up transistor off.

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