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These voltages are optically coupled and electrically remoted to the inputs of the low voltage circuits through the use of low voltage power line optically coupled isolators. Furthermore, the cost of resistors and isolators are less as compared to that of the transformers. In addition, the transformer-much less method is the smaller dimension as in contrast with that of transformers to enable a compact type issue design. Some great benefits of this transformer-less methodology as in comparison with the transformer method are direct sensing of current and voltage that allows AC power and power measurements for non-resistive loads, tamper proof for safe power measurements, compact sizes, and low prices. The circuit designs for voltage and current 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 methodology must be easily carried out, price effective and adaptable to current techniques. The tactic consists of coupling not less than one resistor to a excessive voltage portion of the sensible meter. Accordingly, many modifications could also be made by considered one of atypical talent in the art with out departing from the spirit and scope of the present invention.

A key characteristic of the current invention is that there is no such thing as a want for a transformer when sensing voltage and present. FIG. 6 is an illustration of circuit for voltage sensing transistor in 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 related to the second terminal of a resistor RL sixty nine in the open collector configuration. FIG. 4 is an illustration of circuit for present sensing for the open collector configuration with a load resistor related to the collector. FIG. 3 is an illustration of circuit design for present sensing transistor in an emitter follower configuration with load resistor linked to the emitter. FIG. Three is an illustration of circuit design for a current sensing portion of voltage and current sensors 39 in the smart meter three of FIG. 2 for a single-part energy line system. The database will be analyzed to determine optimal power utilization and distribution. In so doing, resistors could be utilized to supply the present or voltage sensing properties of the smart meter.

By eliminating the transformer the good meter can be bodily smaller, much less pricey and won't be tampered as in the case when the transformer core is placed in a saturation situation. FIG. 2 is an illustration of a smart meter 3 in accordance with an embodiment. FIG. 1 is an illustration of sensible meter system. FIG. 2 is an illustration of a wise meter in accordance with an embodiment. In a first side a way of sensing present within a sensible meter is disclosed. The tactic includes coupling a resistor voltage divider to a high voltage portion of the smart meter. The tactic additionally contains optically coupling the excessive voltage portion to a low voltage portion of the good meter. Using optically coupled isolators, the sensed voltages in the high voltage power lines are optically coupled and electrically remoted to the low voltage circuits. Circuits for the voltage and current sensing technique are described using resistors and optically coupled isolators. A transformer-less method and system for voltage and current sensing utilizing voltage drops throughout resistors is disclosed.

The present invention is said generally to meters for measuring power and more notably to a wise meter system. The first terminal of a small shunt resistor RS 7 is connected in collection with the hot line of power line pair 6 which is a excessive voltage portion 100; the opposite energy line 5 is the impartial or floor line. The battery backup 36 enables the detection of power failure within the smart meter 3. The status of the battery backup 36 is reported in the Status register. There may be a necessity to reinforce system efficiency, reliability, testability and manufacturability of the good meter in the course of the product manufacturing and prototyping. The sensible meter system 50 includes an area server 1 connected to a coordinator 2 and smart meters three (sensible meter 1-N). In a single embodiment, the local server 1 is related to the coordinator 2 by way of wires. The good meter system 50 is a many-to-one data communication topology. That is made doable by optically isolating a high 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 related to the primary terminal of a resistor RL fifty eight within the emitter follower configuration.