Smart Meter Voltage Sensing using Optically Coupled Isolators > 자유게시판

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These voltages are optically coupled and electrically remoted to the inputs of the low voltage circuits by utilizing low voltage power line optically coupled isolators. Furthermore, the price of resistors and isolators are much less as compared to that of the transformers. In addition, the transformer-less strategy is the smaller dimension as compared with that of transformers to allow a compact type factor design. The advantages of this transformer-less methodology as in comparison with the transformer strategy are direct sensing of present and voltage that enables AC power and vitality measurements for non-resistive hundreds, tamper proof for safe power measurements, compact sizes, and low prices. The circuit designs for voltage and present sensing's and electrical isolation are disclosed. FIG. 5 is an illustration of circuit for voltage sensing transistor in an emitter follower configuration with a load resistor linked to the emitter. FIG. 1 is an illustration of the sensible meter system 50 in accordance with an embodiment. The system and method must be easily applied, cost effective and adaptable to existing techniques. The method consists of coupling at the least one resistor to a high voltage portion of the smart meter. Accordingly, many modifications may be made by one among unusual ability in the art with out departing from the spirit and scope of the present invention.

A key function of the current invention is that there is no such thing as a need for a transformer when sensing voltage and current. 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 69 has a base terminal B that's optically coupled to the IF LED 66. The emitter terminal E is related to the Vss terminal 71. The collector terminal C is related to the second terminal of a resistor RL sixty nine within the open collector configuration. FIG. 4 is an illustration of circuit for current sensing for the open collector configuration with a load resistor linked to the collector. FIG. Three is an illustration of circuit design for current sensing transistor in an emitter follower configuration with load resistor related to the emitter. FIG. Three is an illustration of circuit design for a present sensing portion of voltage and present sensors 39 in the good meter three of FIG. 2 for a single-section energy line system. The database may be analyzed to determine optimum energy utilization and distribution. In so doing, resistors might be utilized to supply the current or voltage sensing properties of the smart meter.

By eliminating the transformer the smart meter might be physically smaller, less costly and won't be tampered as within the case when the transformer core is placed in a saturation condition. FIG. 2 is an illustration of a smart meter three in accordance with an embodiment. FIG. 1 is an illustration of sensible meter system. FIG. 2 is an illustration of a sensible meter in accordance with an embodiment. In a primary facet a technique of sensing current within a wise meter is disclosed. The method consists of coupling a resistor voltage divider to a excessive voltage portion of the smart meter. The tactic additionally contains optically coupling the excessive voltage portion to a low voltage portion of the smart meter. Using optically coupled isolators, the sensed voltages in the high voltage energy strains are optically coupled and electrically remoted to the low voltage circuits. Circuits for the voltage and present sensing methodology are described utilizing resistors and optically coupled isolators. A transformer-much less technique and system for voltage and present sensing utilizing voltage drops across resistors is disclosed.

The present invention is said typically to meters for measuring energy and more notably to a smart meter system. The first terminal of a small shunt resistor RS 7 is related in sequence with the hot line of power line pair 6 which is a excessive voltage portion 100; the other power line 5 is the impartial or floor line. The battery backup 36 allows the detection of energy failure in the smart meter 3. The standing of the battery backup 36 is reported within the Status register. There may be a necessity to boost system performance, reliability, testability and manufacturability of the good meter during the product production and prototyping. The good meter system 50 includes a local server 1 connected to a coordinator 2 and smart meters 3 (good meter 1-N). In a single embodiment, the local server 1 is connected to the coordinator 2 through wires. The good meter system 50 is a many-to-one information communication topology. This is made attainable by optically isolating a excessive voltage portion of the sensible meter from a low voltage portion. An optical transistor 57 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 connected to the VDD terminal 56. The emitter terminal E is linked to the primary terminal of a resistor RL fifty eight within the emitter follower configuration.