Low Voltage Power Line For Dollars

FIG. 7 is an illustration of circuit for voltage and current sensing for the emitter follower configuration for a 3-part power line application. 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 sixty nine has a base terminal B that's optically coupled to the IF LED 66. The emitter terminal E is connected 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 connected 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 tactic contains coupling at the least one resistor to a high voltage portion of the good meter. Using optically coupled isolators, the sensed voltages within the high voltage power traces are optically coupled and electrically remoted to the low voltage circuits. If you reside near the proposed energy traces this can have an effect on property values and be a harmful well being hazard.

The battery backup 36 enables the detection of power failure in the smart meter 3. The status of the battery backup 36 is reported in the Status register. The sensible meter 3 includes a energy supply 35, a battery backup 36, a liquid crystal display or LCD display 37, a RF controller System-on-Chip (SOC) 38, and voltage and current sensors 39. The battery backup 36 offers a non-interruptible power provide in the occasion of a power failure. The sensible meter system 50 comprises a local server 1 linked to a coordinator 2 and smart meters three (sensible meter 1-N). In a single embodiment, the local server 1 is linked to the coordinator 2 by way of wires. On this embodiment, the native server 1 issues a command to the coordinator 2 which executes the command by sending a corresponding data packet wirelessly to the sensible meters 3 by a radio frequency (RF) link, e.g. ZigBee that may or might not help an trade normal equivalent to IEEE 802.14.5. Then the sensible meters 3 ship an appropriate response again to the coordinator 2 by the same RF link. The present invention is expounded generally to meters for measuring power and extra notably 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 contains coupling a resistor voltage divider to a excessive voltage portion of the sensible meter. In sensible meter system voltage and present sensing, electrical isolation between the excessive voltage and the low voltage domains is necessary. Although the electric corporations declare that these high 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 related in sequence with the recent line of energy line pair 6 which is a excessive voltage portion 100; the opposite power line 5 is the neutral or ground 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 connected to the VDD terminal 56. The emitter terminal E is related to the first terminal of a resistor RL fifty eight in the emitter follower configuration. FIG. 3 is an illustration of circuit design for a present sensing portion of voltage and current sensors 39 within the good meter 3 of FIG. 2 for a single-phase energy line system.

The circuit SI1 seventy three senses the present of L1 part; the circuit SV1 74, senses the voltage of L1 part; the circuit SI2 75, senses the current of L2 part; the circuit SV2 76, senses the voltage of L2 part; the circuit SI3 77, senses the current of L3 section; the circuit SV3 78, senses the voltage of L3 part. One common method to achieve that's to use voltage and current transformers. The next description is introduced to enable one in all atypical ability within the artwork to make and use the invention and is offered in the context of a patent utility and its necessities. Although the present invention has been described in accordance with the embodiments shown, one in every of odd ability in the art will readily acknowledge that there may very well be variations to the embodiments and people variations would be within the spirit and scope of the current invention. A key characteristic of the present invention is that there isn't any want for a transformer when sensing voltage and present. A transformer-much less method and system for voltage and present sensing utilizing voltage drops across resistors is disclosed.