Open Mike on Low Voltage Power Line > 자유게시판

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FIG. 3 is an illustration of circuit design for current sensing transistor in an emitter follower configuration with load resistor connected to the emitter. 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 is optically coupled to the IF LED 66. The emitter terminal E is linked to the Vss terminal 71. The collector terminal C is linked to the second terminal of a resistor RL sixty nine within 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 linked to the VDD terminal 56. The emitter terminal E is linked to the primary terminal of a resistor RL 58 within the emitter follower 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 related to the VDD terminal 11. The emitter terminal E is connected to the first terminal of a resistor RL 13 in an emitter follower configuration.

That is made possible by optically isolating a excessive voltage portion of the sensible meter from a low voltage portion. A wise meter system voltage and current sensing are performed as voltage drops throughout a shunt resistor in series with the power line or from a voltage divider linked throughout the facility traces. Using optically coupled isolators, the sensed voltages within the excessive voltage energy lines are optically coupled and electrically isolated to the low voltage circuits. The facility usage might be accessed for example by displaying web pages utilizing any device that is related to the native server or the web. In so doing, resistors might be utilized to supply the present or voltage sensing properties of the good meter. The power usage may also be analyzed to enable system control, e.g. lower off the power if essential. The good meter three includes a energy provide 35, a battery backup 36, a liquid crystal show or LCD display 37, a RF controller System-on-Chip (SOC) 38, and voltage and current sensors 39. The battery backup 36 gives a non-interruptible energy provide in the event of a power failure. In a second side, a technique of sensing voltage within a smart meter is disclosed.

A transformer-much less method and system for voltage and current sensing using voltage drops throughout resistors is disclosed. A key characteristic of the current invention is that there is no such thing as a need for a transformer when sensing voltage and current. There is a necessity to enhance system performance, reliability, testability and manufacturability of the sensible meter during the product manufacturing and prototyping. Although the present invention has been described in accordance with the embodiments shown, considered one of unusual talent in the art will readily recognize that there could be variations to the embodiments and people variations could be throughout the spirit and scope of the present invention. Various modifications to the preferred embodiments and the generic ideas and features described herein will probably be readily obvious to those expert within the artwork. Thus, the present invention isn't intended to be limited to the embodiments proven, however is to be accorded the widest scope consistent with the principles and features described herein. To describe the features of the present invention in additional element refer now to the next description in conjunction with the accompanying Figures. The next description is introduced to enable considered one of atypical talent within the artwork to make and use the invention and is supplied within the context of a patent application and its necessities.

Accordingly, many modifications may be made by considered one of ordinary ability within the artwork with out departing from the spirit and scope of the current invention. On this embodiment, the native server 1 points a command to the coordinator 2 which executes the command by sending a corresponding knowledge packet wirelessly to the smart meters 3 by a radio frequency (RF) link, e.g. ZigBee that will or could not assist an industry standard equivalent to IEEE 802.14.5. Then the good meters three send an appropriate response again to the coordinator 2 by the same RF hyperlink. The native server 1 issues commands to the coordinator 2 through a coordinator-server interface control register. FIG. 7 is an illustration of circuit for voltage and present sensing for the emitter follower configuration for a 3-phase energy line software. The benefits of this transformer-much less methodology as compared to the transformer method are direct sensing of present and voltage that enables AC energy and vitality measurements for non-resistive hundreds, tamper proof for safe power measurements, compact sizes, and low costs. The system and method have to be simply applied, value effective and adaptable to existing programs. The smart meter system 50 is a many-to-one knowledge communication topology.