Electronic circuit for automatic disconnector
First Claim
1. An electronic circuit arrangement for automatically providing an energizing current to a solenoid for causing ejection of a plug from an outlet upon substantial cessation of current flow being drawn by an appliance by way of said plug, said substantial cessation of current flow being caused by said appliance being switched off.
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Accused Products
Abstract
An electronic circuit arrangement automatically provides an energizing current to a solenoid for ejecting a plug from an outlet coupled to a source of supply voltage upon substantial cessation of current flow being drawn by an appliance by way of the plug while the supply voltage is present. The energizing current is controlled by a controlled switching device. An optional keyed plug is utilizable for selectively enabling operation of the solenoid.
44 Citations
40 Claims
- 1. An electronic circuit arrangement for automatically providing an energizing current to a solenoid for causing ejection of a plug from an outlet upon substantial cessation of current flow being drawn by an appliance by way of said plug, said substantial cessation of current flow being caused by said appliance being switched off.
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6. In an arrangement for automatically disconnecting a plug from an outlet socket by use of a solenoid operating an ejector mechanism for separating said plug from said socket, an electronic circuit for providing an energizing current to said solenoid, said electronic circuit comprising:
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means for providing a signal voltage representative of current flow through said plug to a load connected therewith; first controllable conduction means coupled in series with said solenoid and having a trigger electrode; capacitor means coupled to a supply source for charging said capacitor means with an operating voltage at a time when said current flow is not zero; second controllable conduction means coupled between said capacitor means and said trigger electrode and having a control electrode; and control circuit means coupled between said means for providing a signal voltage and said control electrode. - View Dependent Claims (7, 8, 9, 10)
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11. An electronic circuit for providing a trigger signal to a controlled conduction device upon cessation of current flow in a monitored circuit, comprising:
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means for providing a monitoring signal representative of said current flow; and means for sensing said monitoring signal and for providing said trigger signal when said monitoring signal indicates a substantial cessation of said current flow caused by said appliance being switched off. - View Dependent Claims (12, 13, 14)
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15. An electronic circuit for controlling apparatus for unplugging a plug from an outlet socket, comprising:
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a solenoid for operating a mechanical armature arrangement for physically separating said plug from said socket; controllable conduction means for selectively energizing said solenoid; means for sensing current flow to a load through said plug; and detecting means coupled to said sensing means for detecting a substantial cessation of said current flow caused by said load being switched off and thereupon supplying a trigger signal to said controllable conduction means for energizing said solenoid. - View Dependent Claims (16, 17, 18, 19, 20)
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21. An electronic circuit for controlling apparatus for unplugging a plug from an outlet socket, comprising:
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a solenoid for operating a mechanical armature arrangement for physically separating said plug from said socket; controllable conduction means for selectively energizing said solenoid; means for sensing current flow to a load through said plug; detecting means coupled to said sensing means for detecting a substantial cessation of said current flow and thereupon supplying a trigger signal to said controllable conduction means for energizing said solenoid; and means for sensing the presence of a plug where said plug optionally exhibits a keying element, such that said detecting means is disabled unless said plug does exhibit said keying element. - View Dependent Claims (22, 23, 24, 25)
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- 26. An electronic circuit arrangement for automatically providing an energizing current to a solenoid for ejecting a plug from an outlet connected to an electric supply voltage, upon substantial cessation of current flow being drawn by an appliance by way of said plug while said electric supply voltage is present.
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31. An electronic circuit for providing a trigger signal to a controlled conduction device upon cessation of supply current flow being drawn by a load in a monitored circuit, said monitored circuit being coupled to a source of supply voltage, comprising:
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means for providing a monitoring signal representative of said current flow; and means for sensing said monitoring signal and for providing said trigger signal when said monitoring signal indicates a substantial cessation of said current flow while said source of supply voltage is present. - View Dependent Claims (32, 33, 34)
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35. An electronic circuit for controlling apparatus for unplugging a plug from an outlet socket coupled to a source of supply voltage, comprising:
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a solenoid for operating a mechanical armature arrangement for physically separating said plug from said socket; controllable conduction means for selectively energizing said solenoid; means for sensing supply current flow being drawn by a load through said plug; and detecting means coupled to said sensing means for detecting a substantial cessation of said current flow while said supply voltage is present and thereupon supplying a trigger signal to said controllable conduction means for energizing said solenoid. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification