5 Incredible Low Voltage Power Line Transformations > 나트랑 밤문화2

Accordingly, many modifications may be made by one among atypical talent in the art without departing from the spirit and scope of the present invention. Various modifications to the preferred embodiments and the generic rules and options described herein will be readily apparent to these skilled in the art. Thus, the present invention is just not supposed to be restricted to the embodiments shown, but is to be accorded the widest scope per the ideas and options described herein. A key characteristic of the current invention is that there isn't a want for a transformer when sensing voltage and present. There is a need to reinforce system efficiency, reliability, testability and manufacturability of the sensible meter during the product manufacturing and prototyping. Although the present invention has been described in accordance with the embodiments shown, one in all unusual skill in the artwork will readily recognize that there could possibly be variations to the embodiments and people variations could be within the spirit and scope of the present invention. The current invention is said typically to meters for measuring power and more particularly to a smart meter system. FIG. 1 is an illustration of the smart meter system 50 in accordance with an embodiment.

The tactic includes coupling not less than one resistor to a excessive voltage portion of the good meter. This is made attainable by optically isolating a high voltage portion of the sensible meter from a low voltage portion. The sensible meter system 50 is a many-to-one information communication topology. FIG. 3 is an illustration of circuit design for a current sensing portion of voltage and present sensors 39 in the good meter three of FIG. 2 for a single-section energy line system. The strategy additionally includes optically coupling the excessive voltage portion to a low voltage portion of the smart meter. The tactic includes coupling a resistor voltage divider to a excessive voltage portion of the smart meter. In a primary side a way of sensing current within a wise meter is disclosed. FIG. 1 is an illustration of good meter system. The system and method have to be easily carried out, value efficient and adaptable to current systems. Furthermore, the cost of resistors and isolators are much less as in comparison with that of the transformers.

The circuit designs for voltage and present sensing's and electrical isolation are disclosed. Another advantage of using resistors and optically coupled isolators is the truth that voltage and current sensing's can't be tampered as within the case of transformers by putting a strong exterior magnets in the close proximity as to saturate the transformer cores. By eliminating the transformer the smart meter will be bodily smaller, less costly and will not be tampered as within the case when the transformer core is placed in a saturation condition. The IF LED 9 is biased in the ahead conduction region utilizing a voltage supply VB 8. This bias condition is set by choosing a present-limiting resistor RD 10 that's equal to the distinction of bias voltage source VB eight and the ahead voltage VF of the IR LED diode divided by the ahead current IF of the IR LED diode. This bias situation enables the IR LED diode to function at a voltage bias condition to maximise the sensitivity of the optically coupled isolator and reduce the present consumption. The circuit SI1 73 senses the current of L1 part; the circuit SV1 74, senses the voltage of L1 phase; the circuit SI2 75, senses the current of L2 phase; the circuit SV2 76, senses the voltage of L2 section; the circuit SI3 77, senses the current of L3 part; the circuit SV3 78, senses the voltage of L3 section.

FIG. 6 is an illustration of circuit for voltage sensing transistor in an open collector configuration with a load resistor linked to the collector. FIG. Four is an illustration of circuit for present sensing for the open collector configuration with a load resistor related to the collector. FIG. 6 is an illustration of circuit for voltage sensing transistor within the open collector configuration with a load resistor RL 69. An optical transistor sixty nine has a base terminal B that is optically coupled to the IF LED 66. The emitter terminal E is related to the Vss terminal 71. The collector terminal C is connected to the second terminal of a resistor RL sixty nine in the open collector configuration. An optical transistor 57 has a base terminal B that's optically coupled to the IF LED which is a low voltage portion 102. The collector terminal C is connected to the VDD terminal 56. The emitter terminal E is connected to the first terminal of a resistor RL 58 within the emitter follower configuration. An optical transistor 12 has a base terminal B that is optically coupled to the IF LED which is a low voltage portion 102. The collector terminal C is related to the VDD terminal 11. The emitter terminal E is linked to the primary terminal of a resistor RL thirteen in an emitter follower configuration.

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