Schneider Electric It Corporation

Taiwan Textile Research Institute

Wei-Hsiang Lin

Adam Daniel Sanner

Yu Zhang

Xiaojun Wang

Eyob Demissie

Chao-Huei Liu

Luka Petrovic

Wei-Jen Lai

Venkatraman Chennakesavan

Po-Hsun Huang

Kenneth A Colby, Jr

Chin-Wen Chen

Himamshu V Prasad

Tzu-Chung Lu

Yongshuai Bao

UPS systems, methods, and computer-readable mediums utilizing electromechanical bypass relays to switch from an on-line mode of operation to a green/bypass mode of operation include control logic to adaptively adjust the timing of when an inverter of a UPS turns off to prevent backfeeding a utility. After the UPS is instructed to transition from the on-line mode to the green mode, a monitoring period begins. During the monitoring period, a parameter related to the output current of the inverter is monitored and compared to a predetermined threshold. If the parameter exceeds the predetermined threshold before a fixed period time has elapsed, the inverter is turned off early. If the inverter current does not exceed the predetermined value within the fixed period of time, the inverter is turned off.

Method for reducing UPS component stresses during transition from inverter to green/bypass operation

Power supplies and methods of use thereof are provided, where a power supply includes an input configured to receive input AC power an output configured to provide output AC power to a load, at least one power converter coupled to the input and configured to convert the input AC power into the output AC power, a controller coupled the at least one power converter. The controller is configured to adjust at least one parameter of the output AC power provided by the at least one power converter, detect, in response to adjusting the at least one parameter of the output AC power, at least one of an adjusted input AC power or an adjusted output AC power, and determine that a fault has occurred based on the at least one of the adjusted input AC power or the adjusted output AC power.

Method to detect back-feed and mis-wiring events by a UPS system

A power converter system including a DC bus, a DC/DC converter coupled to the DC bus, an inverter coupled to the DC bus and configured to convert DC power from the DC bus into output AC power having an output current, an output coupled to the inverter and configured to provide the output AC power to a load, and at least one controller configured to identify an impending high-load transient state at the output, and in response to identifying the impending high-load transient state, reduce a peak value of the output current of the output AC power by operating the DC/DC converter to reduce a voltage level on the DC bus and increasing a duty cycle of the inverter.

Inverter control strategy for a transient heavy load

According to one aspect, embodiments of the invention provide a UPS system comprising an input, an output, a neutral connection, an AVR transformer, relays configured to selectively couple a primary winding of the AVR transformer to the input and the output, a bypass relay configured to selectively couple the primary winding to the neutral connection, a DC/AC inverter, and a controller configured to operate the relays, the bypass relay, and the DC/AC inverter to provide output AC power derived from at least one of input AC power and backup DC power, wherein in a backup power mode, the controller is further configured to operate the DC/AC inverter to convert the backup DC power into AC power provided to a secondary winding of the AVR transformer, to monitor the AC output power, and to identify that the bypass relay has decoupled the primary winding from the neutral connection.

AVR bypass relay welding detection

A modified nylon 66 fiber including a first repeating unit derived from adipic acid and hexamethylenediamine, a second monomer unit derived from a diacid or a diamine having a long carbon chain, a third monomer unit derived from a diacid or a diamine having a aromatic ring, and a fourth monomer unit derived from a cyclic diacid or a cyclic diamine is provided. The second monomer unit has 6 to 36 carbon atoms. The third monomer unit has 8 to 14 carbon atoms. The fourth monomer unit has 6 to 10 carbon atoms. Based on a total weight of the modified nylon 66 fiber, a content of the first repeating unit is 78 wt % to 94.8 wt %, a content of the second monomer unit is 0.1 wt % to 1 wt %, a content of the third monomer unit is 5 wt % to 20 wt %, a content of the fourth monomer unit is 0.1 wt % to 1 wt %.

Modified nylon 66 fiber

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Shanghai, China

Wei-Hsiang Lin