摘要:
Methods, systems and metering devices are provided for performing synchronous communication in a frequency hopping communication system without the use of expensive clock circuitry and/or significant amounts of data traffic on the communication system.
摘要:
A wireless mesh network, method of operating a wireless mesh network, and a central node device are disclosed herein. Communications are interleaved to maintain a spatial differential, for example, two “hops,” between any two nodes transmitting in proximity to the collector. In one embodiment, a wireless mesh network includes a central node and a plurality of bidirectional nodes in bidirectional wireless communication with the central node. Each bidirectional node has a respective wireless communication path to the central node that is either a direct path or an indirect path through one or more intermediate bidirectional nodes. Each bidirectional node is characterized by a number of intermediate bidirectional nodes forming a respective wireless communication path to the central node. The central node isolates a first data communication from a first node from second data communications from other nodes that are within a defined threshold of hop levels of the first node.
摘要:
A method, wireless mesh network and processor-readable storage medium for promoting successful end-to-end communication in a polled mesh network while improving system throughput are disclosed herein. Successful communications are acknowledged at each hop level to reduce the need to duplicate packets for redundancy. In this way, if a first bidirectional node transmits a packet to a second bidirectional node, the second bidirectional node acknowledges the packet, and the first bidirectional node receives the acknowledgement, then the first bidirectional node does not need to send a duplicate packet.
摘要:
A load control unit is provided for a meter which can be connected to a meter communication network. The load control unit includes a dual coil solenoid switch that is operable to connect the meter to a load, and disconnect the meter from the load. An electronic switching circuit is provided that reduces or eliminates undesirable braking in the solenoid switch.
摘要:
A method of detecting the presence of an unsafe line condition at a power metering device is disclosed. The method comprises the steps of determining if a disconnect switch is in the open position, and measuring a first voltage at a first load contact. The method measures a second voltage at a second load contact and determines if the first voltage is greater than a first voltage threshold or less than a second voltage threshold. The method further determines if the second voltage is greater than the first voltage threshold or less than the second voltage threshold. The method indicates that an unsafe condition exists if either the first voltage is greater than the first voltage threshold, or first voltage is less than the second voltage threshold or the second voltage is greater than the first voltage threshold or the second voltage is less than the second voltage threshold, when the disconnect switch is in the open position.
摘要:
An electronic meter for measuring electricity consumption is provided that includes extra functionality without significantly increasing cost or complexity of the meter. The meter includes a capacitor for storing energy during normal operation of the meter. The output voltage of the capacitor is used as the input to an auxiliary power supply that is used to power the meter during a power outage. The auxiliary power supply may provide sufficient power to enable the meter to transmit a power outage signal to alert a utility of the power outage. Service disconnect circuitry is also included within the meter to disconnect or reconnect service to the load when desired. The energy stored on the capacitor can be used to energize a relay within the service disconnect circuitry to open or re-close the line to the load. Thus, the single capacitor is used to provide power to two different meter functions.
摘要:
An apparatus comprises a linear power supply and an auxiliary power supply powered from the linear power supply. The auxiliary power supply comprises a switching regulator connected to receive, at an input thereof, the output voltage of the linear power supply and to generate therefrom an output voltage of the auxiliary power supply. The auxiliary power supply further comprises a detection circuit, connected to the linear power supply and to the switching regulator, that detects one of (i) a level of current drawn from the linear power supply and (ii) a level of voltage at an output of the linear power supply and that causes the switching regulator to reduce its load on the linear power supply when the detected level reaches a predetermined threshold.
摘要:
The invention contemplates an electrical power meter and method of operating the electrical power meter. The inventive power meter includes a power supply for converting alternating current (AC) voltage to a direct current (DC) voltage for powering the electronic components, and an optical diode in series with the power supply. The meter may also include an optical communications port in communication with the optical diode and/or a switch (e.g., a transistor) in communication with the optical diode. The switch may be in parallel with the optical diode, and allow DC current to bypass the optical diode when a request for communication is received by the meter. The DC current provided to the optical diode represents communication of data with an optical communications port. The switch may be controlled by a microprocessor device.
摘要:
The auto-restart characteristic of a controller is prevented. A circuit comprises a voltage control loop, a control winding, an optical isolator component, and a diode biasing network. In the case of a power outage, the current from the voltage control loop begins to drop, resulting in the optical isolator component coming out of conduction. The optical isolator component coming out of conduction cuts off current to the control input of the controller. The removal of current causes the control winding voltage to drop, removing current from the diode biasing network, resulting in the removal of a bias voltage from the control pin of the controller. This removal results in the drop of the received voltage at the control pin, such that the received voltage is never in the trigger range of the auto-restart characteristic. Consequently, on reapplication of power, the controller achieves normal startup time.
摘要:
A transistor base drive circuit achieves optimum base current levels to avoid unnecessary transistor power dissipation by including means for diverting excessive base drive from the transistor base to the transistor collector. A capacitor in series with the transistor base decreases switch transition time. Increasing capacitance of the capacitor results in a decrease in transistor saturation voltage, thereby decreasing power dissipation in the transistor.