Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-10-10
2010-06-01
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
07728655
ABSTRACT:
A current limiting load switch for bridging supply Vss and load with a reference voltage VRdtdynamically generated by a VRdt-generator is proposed. It includes: A pair of power FET and sense FET interconnected in split-current configuration. The FET pair develops a load voltage while limiting load current Iload to a preset maximum Imax. The FET pair is sized to draw device currents Ipower and Is with RATIOI=Is/Ipower<<1. The sense FET high-side terminal is coupled to Vss through a sense resistor Rsense developing a sense voltage Vs=Is×Rsense. A current limiting amplifier with inputs connected to VRdtand Vs and output controlling FET pair closing a current limiting feedback loop. The VRdt-generator dynamically adjusts VRdtconcurrent and compensatory with an undesirable effect of changing RATIOIcaused by the sense FET operational transition thus eliminating a transitional overshoot of Iload beyond Imax.
REFERENCES:
patent: 6304108 (2001-10-01), Inn
patent: 2005/0068092 (2005-03-01), Sano
patent: 2005/0206444 (2005-09-01), Perez
Chang Allen
Cheng Wai-Keung Peter
Ng Kevin
Wei Zhinan
Almo Khareem E
Alpha & Omega Semiconductor, Inc.
CH Emily LLC
Donovan Lincoln
Tsao Chein-Hwa
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