Emerson Network Power Co., Ltd.

Liebert Corporation

Dangsheng Zhou

Brian Paul Heber

Bo Dong Liu

Zhihua Wang

Xiaojun Sheng

Quanbo Xia

Yihang Lu

Steve Moran

Chris Crawford

The present invention discloses a method for transmitting parallelization signals of uninterruptible power supplies, which firstly performs a serialization process on parallelization signals by a logic processing unit and then performs synchronous transmission of the parallelization signals of respective node units over a bus. The method for serial transmission of parallelization signals of uninterruptible power supplies according to the invention can be implemented with easy wiring and can achieve a strong anti-interference ability, ensure real time signal transmission over a guaranteed transmission distance and identify conveniently the failure of a parallelization line while satisfying fundamental transmission demands.

Method for transmitting parallelization signals of uninterruptible power supplies

This invention relates to a method of establishing a master unit in a multi-unit parallel system. Each module with a respective number is connected through a bus, and has a different host-identifying pulse width Ts and a host-releasing pulse width Tw. According to the respective numbers, each module sends its host-identifying pulse to the bus and receives the feedback pulse, and then establishes a master unit among all of modules after comparing the feedback pulse width Tr and the host-releasing pulse width Tw. This method effectively realizes a decentralized controlling strategy for phase synchronization in a parallel inverter system and ensures that only one master unit exists in the parallel system. The connection of the multi-string parallel signal bus is simple, and can be connected in circle to provide the redundancy. Compared with the prior art, it is much simple in structure and flexible in configuration and adjustment, and has more reliability and real-time capability.

Method of establishing a master & minus; host in modules connecting in parallel

The present invention relates to a switching synchronization method of parallel converter system, wherein one of converters is the host and the others are slave converters. The host converter includes a first timer and a pulse-transmitting device, and the slave converter includes a second timer, pulse capture device, and a synchronization adjustment. At a fixed time Tk the host converter sends a synchronization pulse to the synchronization bus through the pulse-transmitting device; and in the slave converter the second timer records the time Tx of the edge of the synchronization pulse received by the pulse capture device from the synchronization bus. The synchronization adjuster adjusts the second timer of the slave converter so as to synchronize it with the first timer of the host converter in accordance with the relationship between the times Tk and Tx; and then according to a predetermined protocol, the switching carrier timer of the slave converter so as to be adjusted to synchronize with the switching carrier timer of the host converter.

Method of switching synchronization of parallel-connected converter system

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Shenzhen, China

Dangsheng Zhou