Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
1999-09-13
2001-03-20
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S047000
Reexamination Certificate
active
06205038
ABSTRACT:
The invention relates to a circuit arrangement for providing a unit recognizing system combined with energy supply. The system includes a unit recognizer combined with energy supply and an energy source with variable frequency. The unit recognizer combined with energy supply includes a unit recognizer filter, a potential separating circuit and a supply unit.
It is a usual task in the technical practice in measurement and control technologies to collect data from sensors and operational means installed far from one another, and to output, further to transmit the necessary commands. To achieve this task at least two conditions must be met. The first condition is to ensure energy supply for the operation, the second condition is to select the unit now interesting for us from the plurality of units. One of the most advantageous methods being the subsequent handling of measuring and operational units, the differencing between the units can be provided by separate wiring of units or by addressing the units connected on an identical information line. The task of addressing is usually achieved by various “BUS” systems. Such a method is the use of CAMAC. GPIB systems the common characteristic of which is the great speed and high definition given by digital data transmission. The spanning of relatively great distances demands a special cabling and line fitting, and further sophisticated electronics. Selection, that is addressing of the units, demands costly protection systems in an industrial environment loaded with noises of great energy. The costs of an implemented system are greatly increased by these circumstances. Because of the described drawbacks the above mentioned systems are not currently used.
The sufficient requirements of definition, punctuality and speed can be realized by measurement data collecting means based on industrial personal computers. Such means are the measurement data collecting means produced for example by NATIONAL INSTRUMENTS, ADVANTECH, KLÖCKNER-MOELLER and several other firms. In case of greater measurement and operation distances there is a need of using signal conditioning means completed with line fitting means. When these means are radially arranged, they necessitate great cabling investments, and in the case of serial connection there is a need of addressing and data communication supplements to the above mentioned. As the energy level of signals is limited, the effect of noises in industrial environment cannot be neglected.
The common disadvantages propriety of the described solutions and of the methods embodying them is the necessity to provide a local energy supply for the signal conditioners in the case of great distances, or the energy transport demands costly investments in case of a radial arrangement. A further drawback is that the activation of the corresponding signal conditioner requires addressing techniques which in addition to the complicated solution further increase the costs. A further drawback is that the selection of the signal conditioners and the energy supply to them are two separate tasks. It is again understood that the fitting, installation and supply problems of signal communication between units installed in greater distances, one from another, exist against the rational means of a signal processing and commanding personal computer.
It is an object of the present invention to provide a unit recognizing, unit designating and energy supplying system which eliminates most of the drawbacks of the described solutions, is easily to install, requires minimal wiring, don't necessitate energy supply on the place of measurement and has good noise protection.
The present invention is based on the recognition that having a generator with variable frequency and connecting to it a plurality of signal conditioning and commanding units completed with a unit recognizing unit combined with an energy supply unit, only units with filters tuned on the frequency of the energy present on the energy supply line with the common variable frequency are provided with the energy necessary to their operation in the desired quantity. The so provided energy is brought preferably by potential separation and allocation of a supply unit to the form required to operate the circuits.
The essence of the present invention is to designate the selected unit and at the same time to provide it with the energy in the quality required for its operation by means of adjusting the frequency of variable frequency generator connected to the variable frequency energy line.
The circuit arrangement according to the present invention will be further described in detail with reference to the drawings, in which:
REFERENCES:
patent: 4737657 (1988-04-01), Jatko et al.
patent: 5530638 (1996-06-01), Wu
patent: 0153072 (1985-08-01), None
patent: 2342600 (1977-09-01), None
Patent Abstract of Japan of JP 57199391 of Dec. 1982.
Han Jessica
Ladas and Parry
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