Inductive clamping circuit
First Claim
1. A method for switching off an inductive load comprising:
- switching off a first switching device having a diode aligned with a current polarity of an AC current flow prior to a first zero crossing;
delaying a switching off of a second switching device until after said first zero crossing; and
switching the second switching device off after said delay and before a second zero crossing.
1 Assignment
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Accused Products
Abstract
A power control circuit includes a solid state power controller operable to connect an AC power source to a load. The solid state power controller includes a first switching device and a second switching device arranged serially. Each of the switching devices includes a diode, a controller controllably coupled to each of the first switching device and the second switching device, such that the controller is capable of controlling an on/off state of the first switching device and the second switching device. The controller further includes a non-transitory memory storing instructions for causing the controller to perform the steps of: switching off a first switching device having a diode aligned with a current polarity of an AC current flow prior to a first zero crossing, delaying a switching off of a second switching device until after the first zero crossing, and switching the second switching device off after the delay and before a second zero crossing.
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Citations
16 Claims
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1. A method for switching off an inductive load comprising:
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switching off a first switching device having a diode aligned with a current polarity of an AC current flow prior to a first zero crossing; delaying a switching off of a second switching device until after said first zero crossing; and switching the second switching device off after said delay and before a second zero crossing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A power control circuit comprising:
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a solid state power controller operable to connect an AC power source to a load, wherein the solid state power controller includes a first switching device and a second switching device arranged serially and wherein each of said switching devices includes a diode, a controller controllably coupled to each of said first switching device and said second switching device, such that said controller is capable of controlling an on/off state of said first switching device and said second switching device; said controller further including a non-transitory memory storing instructions for causing the controller to perform the steps of; switching off a first switching device having a diode aligned with a current polarity of an AC current flow prior to a first zero crossing; delaying a switching off of a second switching device until after said first zero crossing; and switching the second switching device off after said delay and before a second zero crossing. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification