The best Option to Low Voltage Power Line > 자유게시판

A smart meter system voltage and current sensing are carried out as voltage drops throughout a shunt resistor in sequence with the power line or from a voltage divider linked across the ability traces. A transformer-much less method and system for voltage and present sensing using voltage drops throughout resistors is disclosed. The smart meter system 50 is a many-to-one information communication topology. In this embodiment, the local 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) hyperlink, e.g. ZigBee that will or could not help an industry commonplace akin to IEEE 802.14.5. Then the good meters 3 ship an applicable response back to the coordinator 2 by the identical RF hyperlink. In one other embodiment, the local server 1 is linked to the coordinator 2 wirelessly. The power utilization might be accessed for instance by displaying internet pages utilizing any system that is linked to the local server or the web. The native server 1 points commands to the coordinator 2 through a coordinator-server interface control register.

For example, an F-01 error code points in the direction of a main digital management board failure, which can require substitute of the main electronic management board. On a Maytag dryer, a PF error code indicates a power failure, an AF error code indicates restricted air flow and an L2 code indicates low or no line voltage. Cite:Bochuan Wang, Xixiu Wu, Zhuqing Xia, Xin Yang, and Zhining Yang, "Research on the Characteristics of the Low Voltage Power Line Carrier Communication Channel," Journal of Advances in Computer Networks vol. FIG. 7 is an illustration of circuit for voltage and present sensing for the emitter follower configuration for a 3-section power line software. The losses on a transmission line are proportional to the present flowing on the line, so transmitting at high voltage (and therefore low current) is helpful as it reduces the amount of energy that is misplaced as a consequence of resistance in the road itself. These voltages are optically coupled and electrically remoted to the inputs of the low voltage circuits by utilizing optically coupled isolators. Using optically coupled isolators, the sensed voltages in the high voltage power strains are optically coupled and electrically remoted to the low voltage circuits. Furthermore, the cost of resistors and isolators are much less as compared to that of the transformers.

The system and technique have to be simply implemented, price effective and adaptable to existing techniques. FIG. 1 is an illustration of smart meter system. There's a need to boost system performance, reliability, testability and manufacturability of the good meter throughout the product manufacturing and prototyping. In sensible meter system voltage and current sensing, electrical isolation between the excessive voltage and the low voltage domains is necessary. FIG. 2 is an illustration of a smart meter in accordance with an embodiment. In so doing, resistors will be utilized to supply the current or voltage sensing properties of the smart meter. The battery backup 36 enables the detection of energy failure within the sensible meter 3. The status of the battery backup 36 is reported within the Status register. Some great benefits of this transformer-less method as in comparison with the transformer method are direct sensing of current and voltage that permits AC power and energy measurements for non-resistive loads, tamper proof for safe power measurements, compact sizes, and low prices. Audio transformers are generally used to interconnect professional audio methods parts. Another benefit of using resistors and optically coupled isolators is the truth that voltage and current sensing's can't be tampered as in the case of transformers by inserting a strong exterior magnets in the shut proximity as to saturate the transformer cores.

The circuit designs for voltage and current sensing's and electrical isolation are disclosed. There are three kinds of potential transformers: optical, capacitor and electromagnetic transformers. The electromagnetic and capacitor transformers are each designed for greater voltage functions. Potential transformers are used to monitor single-phase and three-phase energy line voltages in power metering applications. The ability utilization can also be analyzed to allow system control, e.g. reduce off the facility if mandatory. FIG. 1 is an illustration of the smart meter system 50 in accordance with an embodiment. FIG. 3 is an illustration of circuit design for a present sensing portion of voltage and current sensors 39 in the smart meter three of FIG. 2 for a single-part power line system. The good meter 3 contains a power provide 35, a battery backup 36, a liquid crystal show or LCD show 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 energy failure. The primary terminal of a small shunt resistor RS 7 is connected in series with the new line of energy line pair 6 which is a excessive voltage portion 100; the other energy line 5 is the impartial or floor line.