 Machine monitor with tethered sensors |
| OF PREFERRED EMBODIMENTS In accordance with a preferred embodiment of the present invention shown ... |
|
| Motion detection and motion compensative prediction circuit |
| In view of such aspects, it is an object of the present invention to provide a motion-detecting and ... |
|
| Adaptive polling rate algorithm for SNMP-based network monitoring |
| Accordingly, the present invention provides an adaptive rate of polling which is sensitive to ... |
|
| Method of remote access and control of environmental conditions |
| Embodiments of the inventive remote access system provides system administrators with new levels of ... |
|
| System architecture for remote access and control of environmental management |
| Embodiments of the inventive remote access system provides system administrators with new levels of ... |
|
| Multi-utility energy control system |
| The present invention involves multi-utility energy control system with at least one control center ... |
|
| Device and system for management of battery back up power source |
| The present invention obviates and mitigates the disadvantages inherent in the prior art by ... |
|
|
Electric circuit control device
| Details |
Inventors: Raes, Marc;
Assignee: Compagnie Industrielle des Telecommunications Citalcatel (FR)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Logan; Sharon D.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak, and Seas
An electronic control device enables a load to be separated from a power supply network for a time corresponding to the period which the load would cause a major disturbance in the network due to the state of the load at the time of a temporary main outage. The electric circuit control device comprises a first, normally open controlled switch (2) connected in the electric circuit, a second, normally closed, controlled switch (4) shunted with the first controlled switch (2), a power supply network (6) for supplying power to the control device, first time delay control network (17) connected to the first controlled switch (2), second time delay control network (30) connected to the second controlled switch (4) and memory network (41) connected to the second controlled switch (4), the time delay of the first control network (17) being at most equal to the time delay of the second control network (30). |
|
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT In one advantageous embodiment of the invention, the memory means consist of a capacitor associated with at least one resistor, parallel-connected to the capacitor's terminals.
Thus, when the network supply is cut off, the capacitor gradually discharges into the resistor and the memory means automatically return to zero, after a delay determined by the capacitor's characteristics.
According to a preferred embodiment of the invention, the memory means comprise at least a second resistor connected in parallel with the first in series with a third, normally open, controlled switch the control thereof being connected to the supply means.
Thus, when the circuit is re-powered, the second resistor speeds the capacitor's discharge, which compensates the slowing of said discharge caused by the repowering of the device.
Another feature of the preferred of the invention is that at least one of the control means of the first and second controlled switches comprises at least a first flip-flop the output whereof is connected to the corresponding switch, time delay means arranged between the supply means and the first flip-flop and means for holding the control means in an activated position.
Thus, the control means are automatically maintained in their normal operating position as long as no outage has occurred in the network.
A further feature of the preferred embodiment is that the time delay means comprise a resistor one terminal whereof is connected to the supply means and the other terminal whereof is connected on the one hand to the input of the first corresponding flip-flop and on the other hand to a first terminal of a capacitor, and the holding means comprise a second flip-flop having one input connected to the output of the first flip-flop and its output connected to a second terminal of the capacitor opposite the first.
Thus, the time during which the controlled switch remains de-energized corresponds to the time required to charge the capacitor through the resistor, such that the first flip-flop is only activated after a set amount of time and then is automatically kept activated by the second flip-flop
|
|
Processing Data 
