Patent ID: 6934672

Claim:
An apparatus to provide multiple-mode control to a controlled system through an output port comprising: a primary control circuit, having a regulator portion driving an active controlling portion, receiving a feedback output from said controlled system at an input of said regulator portion, an output of said primary control circuit connectable to said output port; an alternate control circuit receiving said feedback output, an output of said alternate control circuit connectable to said output port; a monitoring circuit generating a mode indication of one of a primary mode and an alternate mode in response to a monitored parameter of said controlled system; a selecting mechanism disposed between said output port and said outputs of said primary control circuit and said alternate control circuit, said selecting mechanism controlled by said mode indication of said monitoring circuit; a transient management system operative to simulate said feedback output of said controlled system when driven by said active controlling portion, said transient management system having an input connected to an output of said regulator portion when said primary control circuit is connected to said controlled system, said input connected to a transient management system feedback output otherwise; and a compensation network including a first terminal connected to said feedback output and a second terminal connected to a switch providing connection to an output of said regulator portion in primary mode and to said transient management feedback output in alternate mode, a capacitance present in said compensation network, wherein an output of said controlled system remains approximately steady when the multi-mode control system changes from alternate to primary control mode.