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FIG. 7 is an illustration of circuit for voltage and current sensing for the emitter follower configuration for a 3-phase power line application. 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's 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 12 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 linked to the VDD terminal 11. The emitter terminal E is connected to the primary terminal of a resistor RL 13 in an emitter follower configuration. The strategy includes coupling at the very least one resistor to a high voltage portion of the smart meter. Using optically coupled isolators, the sensed voltages within the high voltage energy traces are optically coupled and electrically isolated to the low voltage circuits. If you live close to the proposed power traces it will affect property values and be a dangerous health hazard.

The battery backup 36 enables the detection of energy failure in the smart meter 3. The standing of the battery backup 36 is reported in the Status register. The smart meter 3 comprises a energy supply 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 offers a non-interruptible energy provide in the occasion of a power failure. The sensible meter system 50 comprises an area server 1 linked to a coordinator 2 and sensible meters three (good meter 1-N). In a single embodiment, the native server 1 is connected to the coordinator 2 through wires. On this embodiment, the native server 1 issues a command to the coordinator 2 which executes the command by sending a corresponding knowledge packet wirelessly to the good meters three by a radio frequency (RF) link, e.g. ZigBee which will or could not support an business standard equivalent to IEEE 802.14.5. Then the sensible meters three send an acceptable response back to the coordinator 2 by the same RF hyperlink. The present invention is expounded typically to meters for measuring power and more particularly to a sensible meter system.

The strategy also includes optically coupling the excessive voltage portion to a low voltage portion of the smart meter. The strategy includes coupling a resistor voltage divider to a excessive voltage portion of the good meter. In smart meter system voltage and present sensing, electrical isolation between the high voltage and the low voltage domains is critical. Although the electric companies declare that these excessive voltage transmission strains are protected for the general public, they emit an immense amount of electro-magnetic radiation. The primary terminal of a small shunt resistor RS 7 is connected in series with the hot line of power line pair 6 which is a high voltage portion 100; the other power line 5 is the neutral or floor line. 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 linked to the VDD terminal 56. The emitter terminal E is connected to the primary terminal of a resistor RL fifty eight in the emitter follower configuration. 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-phase energy line system.

The circuit SI1 seventy three senses the current of L1 phase; 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 phase; the circuit SI3 77, senses the present of L3 phase; the circuit SV3 78, senses the voltage of L3 section. One widespread manner to attain that is to make use of voltage and current transformers. The next description is introduced to enable one in every of abnormal ability in the artwork to make and use the invention and is offered in the context of a patent application and its requirements. Although the current invention has been described in accordance with the embodiments shown, certainly one of ordinary ability within the art will readily recognize that there may very well be variations to the embodiments and those variations would be inside the spirit and scope of the present invention. A key feature of the present invention is that there isn't any want for a transformer when sensing voltage and present. A transformer-less technique and system for voltage and current sensing utilizing voltage drops across resistors is disclosed.