Current-mode control for switched step up-step down regulators

Details Current-mode control for switched step up-step down regulators Current-mode control for switched step up-step down regulators

2008-07-01

2008-07-01

Sterrett, Jeffrey L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

C323S225000, C323S285000

Reexamination Certificate

active

11052480

ABSTRACT:
A switched regulator circuit provides step-up and step-down operation in which the level of the input voltage can be greater, equal to, or less than a preset controlled output voltage. A four switch arrangement or two switch arrangement provides buck, boost, and buck-boost regulation under constant frequency valley-peak current mode control. A single sense resistor may be utilized for sensing inductor current during only a short period during each duty cycle. As an alternative to the sense resistor, the switches themselves can be used to sense current during operation.

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