Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Reexamination Certificate
2008-03-18
2008-03-18
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
C323S288000, C323S290000
Reexamination Certificate
active
07345459
ABSTRACT:
Method and circuit for automatic correction of emulated inductor current without knowledge of actual inductor current ramp for an emulated current mode (ECM) PWM switching regulator. In an ECM-PWM switching regulator a compensation ramp component is usually added to an up-slope. An excess ramp component may also be added compared to actual inductor current. According to one embodiment of the present invention, an integrating negative feedback circuit is employed to reduce both extra components. According to another embodiment, a single integrating negative feedback loop is added to the ECM-PWM regulator to retain the compensation ramp component while reducing the excess ramp component. According to a further embodiment, excess ramp component is reduced by adding the integrating negative feedback loop at an end stage of the circuit. Finally, the feedback loop with two duplicate track-and-hold circuitry may be added to reduce the excess ramp component, while retaining the compensation component.
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Hariman George A.
Tomiyoshi Kenji
Darby & Darby P.C.
Gaffney Matthew M.
National Semiconductor Corporation
Patel Rajnikant B.
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