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This paper focuses on the non-inverting buck-boost converter supplying an adjustable DC voltage to a WCDMA RF power amplifier (RFPA) in order to improve the system efficiency under different transmitted RF power levels. It is shown that precise output voltage positioning and low output voltage ripple over a wide output voltage range, including buck, boost and buck/boost transition modes, can be accomplished...
This paper focuses on efficiency characterization and efficiency improvements in digitally controlled DC-DC converters operating at light loads. An automated efficiency characterization system has been designed based on a Labview controlled laboratory setup and communication with an FPGA based digital controller via serial link. Experimental efficiency characterization results, in conjunction with...
Spacecraft power systems and other mission- critical applications require robust power delivery systems. This paper focuses on two aspects of power converter health monitoring: detecting and analyzing loss-related and frequency response-related changes. Two hardware-efficient algorithms are discussed that can be implemented without any additional sensing points other than those required for operation...
This paper presents an FPGA-based digital network analyzer for digitally controlled switched-mode power supplies. Similar to standard network analyzers, the digital network analyzer can be used to validate converter models and the system design. The digital network analyzer can be built into the digital controller, resulting in an accurate measurement of the actual delays and non-idealities in the...
A DC power supply in physical vapor deposition (PVD) applications operates as a constant power source during normal operation or as a constant current source during fast micro arcs in the plasma. A two-loop control is usually applied: an external (slower) loop controls the output power, while an internal (fast) loop controls the current. This paper introduces a digital average current mode controller...
This paper introduces a digital average current-mode controller architecture based on a low-resolution current A/D converter and a simple digital controller realization. The proposed approach combines advantages of practical digital realization and current-mode control for DC-DC converters operating at high switching frequencies. An experimental test circuit includes an experimental prototype current...
A practical approach for on-line identification of power converter dynamic responses using low-cost digital hardware is presented. The development provides a first step towards adaptive power delivery in electronic systems and can be used for simple off-line controller design. A hardware efficient algorithm is derived and verified with experimental results using a 90 W forward converter with an FPGA-based...
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