Over current protection method and device
AssigneeSatec Ltd.
InventorLev Zisman
Life of this patent
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Abstract
An over current protection system, the system includes: a sampling rate unit, adapted to determine a sampling rate of at least one alternating input current in response to an alternating input current cycle duration; and a controller, adapted to receive samples of the at least one alternating input current and to initiate an appliance of an over current protection measure if at least one of the following conditions is fulfilled: an amplitude of an alternating input current exceeds a first threshold before magnitudes of multiple alternating input current samples exceed a second threshold; and magnitudes of multiple alternating input current samples exceed a third threshold, wherein the third threshold exceeds the first and second thresholds.
Claims25
A method for over current protection, the method comprises:
- sampling at least one alternating input current at a sampling rate that is responsive to an alternating input current cycle;
- and
- applying an over current protection measure if at least one of the following conditions is fulfilled:
- (i) an amplitude of an alternating input current exceeds a first threshold before magnitudes of multiple alternating input current samples exceed a second threshold;
- (ii) magnitudes of multiple alternating input current samples exceed a third threshold, wherein the third threshold exceeds the first and second thresholds.
An over current protection system, the system comprises:
- a sampling rate unit, adapted to determine a sampling rate of at least one alternating input current in response to an alternating input current cycle duration;
- and
- a controller, adapted to receive samples of the at least one alternating input current and to initiate an appliance of an over current protection measure if at least one of the following conditions is fulfilled:
- (i) an amplitude of an alternating input current exceeds a first threshold before magnitudes of multiple alternating input current samples exceed a second threshold;
- and
- (ii) magnitudes of multiple alternating input current samples exceed a third threshold, wherein the third threshold exceeds the first and second thresholds.
An over current protection system, the system comprises:
- a controller, adapted to receive samples of the at least one alternating input current and to initiate an appliance of an over current protection measure if at least one of the following conditions is fulfilled:
- (iii) an amplitude of an alternating input current exceeds a first threshold before magnitudes of multiple alternating input current samples exceed a second threshold;
- and
- (iv) magnitudes of multiple alternating input current samples exceed a third threshold, wherein the third threshold exceeds the first and second thresholds;
- wherein the controller is adapted to calculate the amplitude of an alternating input current in response to a square of a first derivative of the alternating input current and to a square of the second derivative of the alternating input current.
Dependencies are inferred from the claim text.