Electronic control equipment
First Claim
1. A circuit for automatically controlling an electrical system including a regulating element so as to avoid abrupt increases in output when the power supply is reconnected after an interruption, comprising:
- means for detecting a voltage on a supply rail and for producing an output when the voltage is greater than a predetermined value;
reservoir means whose output is connected to the output of said detecting means;
level detection means whose input is connected to the output of said reservoir means and which produces an output if the reservoir level falls below a predetermined value;
and control voltage generating means having an input connected to the output of said level detection means, said control voltage generating means being adapted to generate a control voltage for the regulating element which decreases abruptly when the generating means receives an inhibiting input and increases progressively at a predetermined rate from a low level, when the inhibiting input is removed;
whereby the occurrance of an interruption of the supply rail voltage causes an output from the level detection means which inhibits the control voltage generating means.
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Accused Products
Abstract
Electrical control apparatus including a power supply, a regulating element, a manually-operable control device which can be set to provide a preset output from the regulating element, and an automatic control circuit for modifying the operation of the control elements in the event of a power failure. The automatic control circuit is so arranged as to rapidly reduce the output to zero when the absolute supply voltage falls below a predetermined level, and to progressively raise the output to the preset level when the supply voltage is restored.
15 Citations
10 Claims
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1. A circuit for automatically controlling an electrical system including a regulating element so as to avoid abrupt increases in output when the power supply is reconnected after an interruption, comprising:
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means for detecting a voltage on a supply rail and for producing an output when the voltage is greater than a predetermined value; reservoir means whose output is connected to the output of said detecting means; level detection means whose input is connected to the output of said reservoir means and which produces an output if the reservoir level falls below a predetermined value; and control voltage generating means having an input connected to the output of said level detection means, said control voltage generating means being adapted to generate a control voltage for the regulating element which decreases abruptly when the generating means receives an inhibiting input and increases progressively at a predetermined rate from a low level, when the inhibiting input is removed; whereby the occurrance of an interruption of the supply rail voltage causes an output from the level detection means which inhibits the control voltage generating means. - View Dependent Claims (2, 3, 4)
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5. In an A.C. power control circuit for regulating the current supplied to a load by phase control wherein a control voltage on the input of a regulating circuit determines the proportion of time for which a regulating device conducts load current, the improvement comprising:
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a. means for detecting an interruption of power on a pair of A.C. supply lines of a duration greater than a predetermined duration and for producing an output indicative of said interruption, and b. means for generating a voltage referenced to one of the A.C. supply lines which voltage determines the control voltage and changes in one direction abruptly when an interruption occurs and, when power is reconnected, changes in the other direction progressively at a predetermined rate from a value which determines a near zero proportion of time for current conduction. - View Dependent Claims (6, 7, 8, 9, 10)
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Specification