Kasemsan I Siri

6369462, Apr 9, 2002

May 2, 2001

09/847496

Kasemsan Siri - Torrance CA

The Aerospace Corporation - El Segundo CA

H02J 110

307 51

A maximum power tracker maximizes the power deliverable from a power source, such as a solar array using increasing, decreasing and maintaining states controlled by a set point signal modulated by a dither signal for stabilized regular power tracking during under demand conditions and maximum power tracking during periods with over demand conditions of a load. Multiple converters and respectively maximum power trackers can be coupled in parallel using shared bus control signal for fault tolerant equalized power conversion through the converters.

6433522, Aug 13, 2002

Sep 27, 2001

09/966139

Kasemsan Siri - Torrance CA

The Aerospace Corporation - El Segundo CA

G05F 140

323272, 323906, 320101

A maximum power tracker maximizes the power deliverable from a power source, such as a solar array using increasing, decreasing and maintaining states controlled by a set point signal modulated by a dither signal for stabilized regular power tracking during under demand conditions and maximum power tracking during periods with over demand conditions of a load. For multiple power sources, respective multiple sets of parallel-connected converters and respectively maximum power trackers can be coupled in parallel using shared bus and control signals for fault tolerant equalized power conversion among the parallel-connected converters. Among multiple solar array sources that can have quite different characteristics, some maximum power trackers may actively regulate maximum power flows from respective array sources that have deficient power while the remaining maximum power trackers are inactive because respective remaining solar array sources provide sufficient power to allow respective DC-DC converters to regulate the load voltage to a regulated level.

6775160, Aug 10, 2004

Sep 27, 2002

10/256694

Kasemsan Siri - Torrance CA

The Aerospace Corporation - El Segundo CA

H02M 542

363 89, 363125

A power recycling system receives input power at an input and feeds back through an auxiliary output recycled power to the input for supplementing the input power for recycling energy of the recycled power that would normally be wasted so as to provide improved power efficiency. The system can have several configurations, including a system for testing power supplies under test, or can be any electrical device, system, appliance or electronic load having a power input and auxiliary output for feeding back recycled energy to the power input.

7151362, Dec 19, 2006

Jun 3, 2005

11/145336

Kasemsan Siri - Torrance CA, US

The Aerospace Corporation - El Segundo CA

G05F 1/40

323271

A uniform converter output voltage distribution power system evenly controls the individual output voltages of DC-to-DC parallel-input series-output connected converters using a uniform output voltage distribution controller including a generator for generating respective error signals from the converter output voltages using a common distribution reference signal for providing respective converter control signals connected to the converters through respective shared-bus controls for evenly distributing the power delivered by the converters that are shared-bus current-mode converters for preferably providing high output voltages. Employing a common regulation control signal, the controller can also provide system output voltage regulation, system input current limiting, proportional-voltage control, relaxed voltage uniformity, and fault-tolerant power control.

7193872, Mar 20, 2007

Jan 28, 2005

11/045821

Kasemsan Siri - Torrance CA, US

H02M 3/24

363 95

An inverter for use in connecting a DC power source to the utility grid includes a single DC-DC conversion stage, maximum (source) power tracking, and current control based on feed-forward compensation as a function of an input power commanding voltage, rectified utility line voltage, and either a scaled and squared inverse or a scaled inverse of RMS utility line voltage. Various embodiments also include over-voltage, over-current, under-voltage, and over-temperature protection, and a stand-by battery with its battery management control, while others adapt a multiple-channel front-end distributed power system with distributed maximum power tracking to serve as a single DC power source input to the inverter system downstream with controllers, emergency or auxiliary loads, and alternative current feedback control systems for providing an in-phase output current with respect to the utility grid voltage while absorbing maximum power available from the DC power source and minimally utilizing the stand-by battery for maximal system reliability.

7324361, Jan 29, 2008

Mar 19, 2007

11/688083

Kasemsan Siri - Torrance CA, US

H02M 3/24

363 95

An inverter for use in connecting a DC power source to the utility grid includes a single DC-AC conversion stage, maximum (source) power tracking, and current control based on feed-forward compensation as a function of input power voltage error, rectified utility line voltage, and a scaled inverse of RMS utility line voltage. Various topologies of the inverter power stage are developed for bi-directional power-flow operation after those developed for unidirectional power-flow operation. Various embodiments also include over-voltage protection, over-current protection, under-voltage protection, over-temperature protection, and stand-by battery with battery management control, while still others are adapted for a multiple-channel front-end distributed power system with distributed maximum power tracking for serving as a single DC power source input to the inverter system downstream with controllers, emergency or auxiliary loads, and alternative current feedback control systems. Improved control architectures are developed with bipolar sensing of the inverter output current and a bipolar sinusoidal reference signal.

7564149, Jul 21, 2009

Jul 12, 2005

11/179284

Kasemsan Siri - Torrance CA, US
Richard L. Weinbrenner - Palm City FL, US

H02J 1/00
H02J 3/00

307 80

A power and control architecture employing circuitry that sequentially regulate power flows from independent solar-array sources or a mixture of power sources providing power to a common load. The device may be used on a satellite with solar-array sources; however it may also be used on ground based systems. Stiff bus voltage regulation is obtained by tightly controlling the most recently activated power-processing channel while keeping the previously activated power-processing channels in the Maximum Power Tracking mode to supply maximum power to a common load. The remaining power-processing channels are turned off or operated in stand-by mode. In an alternative system, with primary design goal of uniform power sharing among solar-array sources, all solar array sources are activated with uniform power sharing at light load and, as load demand increases, sequentially controlled to operate in the Maximum Power Tracking mode one solar array source at a time as necessary.

7773395, Aug 10, 2010

Feb 21, 2007

11/713826

Kasemsan Siri - Torrance CA, US

The Aerospace Corporation - El Segundo CA

H02M 3/335

363 65, 323271, 307 77

A uniform converter input voltage distribution power system evenly controls the individual input voltages of DC-to-DC series-input parallel-output connected converters using a uniform input voltage distribution controller including a generator for generating respective error signals from the converter input voltages using a common distribution reference signal for providing respective converter control signals connected to the converters through respective shared-bus controls for evenly distributing the power delivered by the converters that are shared-bus current-mode converters for preferably providing a low output voltage. Employing a common regulation control signal, the controller can also provide system output voltage regulation, system input current limiting, proportional-voltage control, relaxed voltage uniformity, and fault-tolerant power control.