Power supply controlled operation sequencing method and apparatu

Details Power supply controlled operation sequencing method and apparatu Power supply controlled operation sequencing method and apparatu

1997-02-27

1998-06-09

Sircus, Brian

Electrical transmission or interconnection systems

Plural load circuit systems

Selectively connected or controlled load circuits

307 38, 307 39, 307130, 307140, 327209, 327 78, 327546, H01H 4700

Patent

active

057639604

ABSTRACT:
A method and apparatus for sequencing the operation of electronic circuits based upon the level of the voltage provided by an external power supply. One or more power supply sequencer circuits may be interposed between an external power supply and one or more electronic circuits. The power supply sequencer circuits comprise a transistor having its high current node coupled to an external power supply, its controlling node coupled to a voltage sequencing means such as a diode and a resistor, wherein the resistor is in turn coupled to the external power supply and the diode is coupled to the ground potential. The transistor has its controlled high current node coupled through a power input node to the power input for the electronic circuit to condition the voltage received thereby. The power input node is in turn coupled through a second resistor to ground potential. The power sequencer circuits set a sequenced voltage level for transitioning the potential supplied to the electronic circuits from the ground potential to the operating potential of the power supply. Multiple versions of the power supply sequencers may be used to enable the sequential operation of an entire system during power supply transitions.

REFERENCES:
patent: 5136181 (1992-08-01), Yukawa
patent: 5565807 (1996-10-01), Ward
patent: 5587684 (1996-12-01), Salcedo

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