These voltages are optically coupled and electrically isolated 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 in comparison with that of the transformers. As well as, the transformer-much less strategy is the smaller dimension as in contrast with that of transformers to allow a compact form issue design. The benefits of this transformer-much less method as in comparison with the transformer approach are direct sensing of current and voltage that allows AC power and energy measurements for non-resistive hundreds, tamper proof for secure 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 good meter system 50 in accordance with an embodiment. The system and methodology must be simply applied, price efficient and adaptable to present systems. The tactic contains coupling not less than one resistor to a high voltage portion of the sensible meter. Accordingly, many modifications may be made by one in every of peculiar skill within the art without departing from the spirit and scope of the current invention.

A key feature of the present invention is that there is no such thing as a want for a transformer when sensing voltage and current. 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 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 69 in the open collector configuration. FIG. Four is an illustration of circuit for current sensing for the open collector configuration with a load resistor related to the collector. FIG. Three 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 good meter three of FIG. 2 for a single-part energy line system. The database can be analyzed to determine optimal power usage and distribution. In so doing, resistors could be utilized to provide the current or voltage sensing properties of the sensible meter.

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

The current invention is related generally to meters for measuring power and more notably to a smart meter system. The first terminal of a small shunt resistor RS 7 is connected in sequence with the recent line of energy 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 in the smart meter 3. The standing of the battery backup 36 is reported in the Status register. There may be a need to reinforce system efficiency, reliability, testability and manufacturability of the good meter throughout the product production and prototyping. The smart meter system 50 includes a local server 1 linked to a coordinator 2 and sensible meters 3 (good meter 1-N). In a single embodiment, the local server 1 is linked to the coordinator 2 via wires. The smart meter system 50 is a many-to-one knowledge communication topology. That is made attainable by optically isolating a excessive voltage portion of the good 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 related 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.