Power unit for single optical fiber communication and controlling method thereof

Abstract

The invention discloses a power unit and a control method of single fiber annular communication, which belongs to an electric power electronic power unit and a driving control method of the electric power electronic power unit. The power unit of the invention comprises an input end fiber and an output end fiber and further comprises an optical-to-electric transducer, a decoder, a signal selector switch, an optical-to-electric transducer, a power circuit and an encoder. The driving control method of the invention adopts single fiber serial communication and an annular signal chain circuit, signals which are sent by a main controller return to the main controller after winding a loop of the annular chain circuit and form closed-loop transmission. The method simplifies the transmission circuit of driving signals, enables the complex design of the signal transmission of a system control circuit and a power circuit to be simple and feasible, reduces the costs and improves the reliability of the system.

Description

technical field [0001] The invention relates to a power electronic power unit and its control method, in particular to a single optical fiber ring communication power unit and its control method. Background technique [0002] Distributed control and modular design are important directions for the development of current power electronics technology, but the connection between the control circuit and the power module driver is still traditional optocoupler or transformer, and the transmission of the drive signal of the control circuit to the power module In point-to-point mode, as many power modules as there are drive signal paths, the system circuit is complex, the cost is high, it is not easy to realize redundancy, lack of versatility, and the system is difficult to modularize and standardize. [0003] In medium and high voltage frequency converters, although optocoupler isolation is replaced by optical fiber, the circuit has good high-voltage working environment performance...

AI Technical Summary

Problems solved by technology

The point-to-point connection between the driving signal of the control circuit and the power module not only becomes complicated, but also requires a large number of optical fiber communication circuits, which increases the cost, and the reliability is relatively poor. As long as one optical fiber communication fails, it may Cause the system to be paralyzed, because the problem of the signal transmission path cannot be solved by withdrawing the power unit from the system, unless the system redundancy design is equipped with a second set of optical fiber transmission system, but this will reduce the number of optical fiber communication circuits. It is extremely large and difficult to be practically applied

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