Arguments of Getting Rid Of Low Voltage Power Line > 자유게시판

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The typical power dissipated in resistive hundreds, e.g. family appliances, could be calculated because the product of root-imply-squares of current and voltage averaged over a time interval. But for non-resistive loads, resembling AC motors, the common AC energy will be calculated by the direct product of current and voltage averaged over a period of time. The database could be analyzed to determine optimum energy usage and distribution. The facility usage will be accessed for example by displaying web pages utilizing any machine that's connected to the local server or the internet. The power utilization may also be analyzed to enable system control, e.g. lower off the facility if obligatory. In good meter system voltage and current sensing, electrical isolation between the excessive voltage and the low voltage domains is important. The first terminal of a small shunt resistor RS 7 is linked in collection with the new line of power line pair 6 which is a excessive voltage portion 100; the opposite energy 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 linked to the first terminal of a resistor RL fifty eight in the emitter follower configuration.

FIG. 4 is an illustration of circuit for present sensing for the open collector configuration with a load resistor linked to the collector. 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 69 has a base terminal B that is optically coupled to the IF LED 66. The emitter terminal E is connected to the Vss terminal 71. The collector terminal C is related to the second terminal of a resistor RL 69 within 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 related to the first terminal of a resistor RL thirteen in an emitter follower configuration. The cathode terminal of an infra-crimson (IR) LED 9 is linked to the primary terminal of resistor RS. In a primary aspect a technique of sensing current inside a smart meter is disclosed. The circuit designs for voltage and present sensing's and electrical isolation are disclosed.

These voltages are optically coupled and electrically isolated to the inputs of the low voltage circuits by using optically coupled isolators. Using optically coupled isolators, the sensed voltages in the excessive voltage energy strains are optically coupled and electrically remoted to the low voltage circuits. Circuits for the voltage and present sensing technique are described utilizing resistors and optically coupled isolators. A transformer-less method and system for voltage and current sensing using voltage drops across resistors is disclosed. However, a direct current sensing can be easily achieved by measuring the voltage drop throughout a small shut resistor linked in series with the ability line. The one location that I can consider mounting is around my Ecobee thermostat in order that I can faucet into the low voltage power line. The advantages of this transformer-less methodology as in comparison with the transformer approach are direct sensing of current and voltage that permits AC energy and power measurements for non-resistive hundreds, tamper proof for safe power measurements, compact sizes, and low costs. A wise meter system voltage and present sensing are carried out as voltage drops throughout a shunt resistor in series with the facility line or from a voltage divider connected across the ability lines.

Furthermore, the price of resistors and isolators are much less as compared to that of the transformers. The system and technique have to be simply carried out, price efficient and adaptable to current techniques. FIG. Three is an illustration of circuit design for a current sensing portion of voltage and present sensors 39 in the smart meter three of FIG. 2 for a single-part power line system. The sensible meter 3 includes a power supply 35, a battery backup 36, a liquid crystal show or LCD display 37, a RF controller System-on-Chip (SOC) 38, and voltage and present sensors 39. The battery backup 36 gives a non-interruptible energy provide in the event of a power failure. The battery backup 36 permits the detection of energy failure in the smart meter 3. The standing of the battery backup 36 is reported within the Status register. FIG. 7 is an illustration of circuit for voltage and present sensing for the emitter follower configuration for a 3-section power line utility. FIG. Three is an illustration of circuit design for present sensing transistor in an emitter follower configuration with load resistor related to the emitter. FIG. 5 is an illustration of circuit for voltage sensing transistor in an emitter follower configuration with a load resistor linked to the emitter.