Simplified small-signal stability analysis for optimized power system architecture

The optimization of power architectures is a complex problem due to the plethora of different ways to connect various system components. This issue has been addressed by developing a methodology to design and optimize power architectures in terms of the most fundamental system features: size, cost and efficiency. The process assumes various simplifications regarding the utilized DC/DC converter models in order to prevent the simulation time to become excessive and, therefore, stability is not considered. The objective of this paper is to present a simplified method to analyze small-signal stability of a system in order to integrate it into the optimization methodology. A black-box modeling approach, applicable to commercial converters with unknown topology and components, is based on frequency response measurements enabling the system small-signal stability assessment. The applicability of passivity-based stability criterion is assessed. The stability margins are stated utilizing a concept of maximum peak criteria derived from the behavior of the impedance-based sensitivity function that provides a single number to state the robustness of the stability of a well-defined minor-loop gain.

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

Wireless power transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current Wireless power transfer (WPT) systems. This study presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in nonresonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phase-shift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a dc-dc converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-of-the-art solutions in terms of efficiency and extractable power.

Operator's, organizational, direct support, and general support maintenance manual : power supply PP-2309C/U (NSN 6130-00-752-2215).

"2 February 1982."

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply PP-7757/U (NSN 6130-01-098-2532).

"5 August 1983."

Operator and organizational maintenance manual : power supply PP-3514/U.

"16 September 1964."

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply PP-7751/U (NSN 6130-00-245-3251) and power supply PP-7752/U (NSN 6130-00-148-6993).

"24 October 1983."

Operator's, organizational, direct support, and general support maintenance manual : power supply, chemical agent automatic alarm, M10 (NSN 6665-00-859-2225).

"October 1971."

Operator and organizational maintenance manual : power supplies PP-1209/FG, PP-1209A/FG, PP-1209B/FG, and PP-1209C/FG.

"4 October 1962."

Organizational, direct support, and general support maintenance repair parts and special tools list for power supplies PP-3990/FRC-93 (NSN 5820-00-034-4234), PP-4151/FRC-93 (NSN 5820-00-034-4239), PP-4765/GRC-159(V) (NSN 6130-00-926-7805), and MP-1 (NSN 5820-00-034-4233).

Includes index.

Direct support and general support maintenance : power supplies, PP-4763/GRC (NSN 5820-00-937-7690) and PP-4763A/GRC (NSN 5820-00-113-9768).

"15 August 1983."

Direct support and general support maintenance manual : power supply PP-3990/FRC-93 (Collins PM-2) (NSN 5820-00-985-8171), power supply PP-4151/FRC-93 (Collins 516F-2) ...

"June 1976."

Direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply, PP-7710/TYC-39(V), (NSN 5805-01-127-0725).

Includes index.

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply, PP-7833/U, (NSN 6130-00-249-2748).

Includes index.

Organizational, direct support , and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply/DC dual, (0-40VDC/0-1.5A), (NSN 6130-00-065-6811).

Includes index.

Operator, organizational, direct support, and general support maintenance manual (including repair parts and special tools list) : power supply PP-4606B/G (NSN 6130-00-504-0327).

"2 April 1973."