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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. 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 in an open collector configuration with a load resistor linked to the collector. 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 linked to the second terminal of a resistor RL 69 in the open collector configuration. 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 connected to the primary terminal of a resistor RL 58 in 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 13 in an emitter follower configuration. The cathode terminal of an infra-crimson (IR) LED 9 is linked to the primary terminal of resistor RS. The method contains coupling at the least one resistor to a excessive voltage portion of the good meter. The tactic contains coupling a resistor voltage divider to a high voltage portion of the smart meter. That is made doable by optically isolating a excessive voltage portion of the sensible meter from a low voltage portion. FIG. 1 is an illustration of sensible meter system. FIG. Three is an illustration of circuit design for a current sensing portion of voltage and current sensors 39 within the sensible meter three of FIG. 2 for a single-part energy line system. In addition, the transformer-much less strategy is the smaller measurement as in contrast with that of transformers to enable a compact form factor design. The advantages of this transformer-much less technique as in comparison with the transformer approach are direct sensing of present and voltage that permits AC power and power measurements for non-resistive masses, tamper proof for safe power measurements, compact sizes, and low costs.

In a second side, a method of sensing voltage within a smart meter is disclosed. In so doing, resistors could be utilized to offer the current or voltage sensing properties of the smart meter. The power usage can be analyzed to enable system control, e.g. reduce off the ability if necessary. The facility usage can be accessed for example by displaying net pages utilizing any system that is connected to the local server or the internet. P/I. You possibly can see that in case you increase voltage, whereas holding power fixed, present is lowered. Another advantage of using resistors and optically coupled isolators is the fact that voltage and present sensing's cannot be tampered as within the case of transformers by inserting a strong external magnets in the close proximity as to saturate the transformer cores. Circuits for the voltage and current sensing technique are described using resistors and optically coupled isolators. Using optically coupled isolators, the sensed voltages within the excessive voltage energy lines are optically coupled and electrically isolated to the low voltage circuits. These voltages are optically coupled and electrically remoted to the inputs of the low voltage circuits through the use of optically coupled isolators. Furthermore, the cost of resistors and isolators are much less as compared to that of the transformers.

The system and methodology should be easily implemented, value effective and adaptable to current methods. In a primary aspect a method of sensing current within a wise meter is disclosed. A transformer-much less technique and system for voltage and present sensing using voltage drops throughout resistors is disclosed. A key characteristic of the current invention is that there isn't a need for a transformer when sensing voltage and present. Although the current invention has been described in accordance with the embodiments shown, one in all odd talent in the artwork will readily recognize that there could be variations to the embodiments and those variations can be inside the spirit and scope of the present invention. FIG. 2 is an illustration of a smart meter in accordance with an embodiment. There may be a need to reinforce system performance, reliability, testability and manufacturability of the sensible meter throughout the product production and prototyping. The good meter 3 contains a energy provide 35, a battery backup 36, a liquid crystal display or LCD show 37, a RF controller System-on-Chip (SOC) 38, and voltage and present sensors 39. The battery backup 36 provides a non-interruptible energy supply within the event of a power failure. The circuit SI1 73 senses the current of L1 phase; the circuit SV1 74, senses the voltage of L1 part; the circuit SI2 75, senses the current of L2 phase; the circuit SV2 76, senses the voltage of L2 part; the circuit SI3 77, senses the present of L3 section; the circuit SV3 78, senses the voltage of L3 part.