Proactively operational over-voltage protection circuit
First Claim
1. A method for providing over-voltage protection for a transformer using an over-voltage protection loop, the transformer to include a primary clock and feedback control circuit, a main servo loop circuit, and the over-voltage protection loop, the method comprising:
- providing a secondary side voltage by activating an over-voltage winding, the over-voltage winding being activated in response to a voltage on a primary winding in the primary clock and feedback control circuit;
using the secondary side voltage to maintain a voltage on a first node of an error amplifier, the error amplifier being electrically coupled to a first node and a second node, wherein the voltage on the first node is maintained according to an internal reference voltage of the error amplifier;
introducing a time delay to a feedback signal transmitted from the second node to the first node through a feedback impedance, the feedback impedance being electrically coupled between the first node and the second node; and
controlling an output voltage at an output node based on the voltage at the first node using an output voltage sensing circuit electrically coupled to at least the first node and the output node,wherein the over-voltage protection loop provides the output voltage for the transformer under an error condition.
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Accused Products
Abstract
Systems and methods are disclosed for providing over-voltage protection for power converters. An over-voltage protection loop includes an error amplifier that maintains an external reference voltage within a highly precise range that can be used to provide a highly precise output voltage from the over-voltage protection loop. The over-voltage protection loop may also include feedback impedance that delays the output of the over-voltage protection loop. The delay may prevent the over-voltage protection loop from being engaged due to voltage transients output from a main servo loop circuit that provides a nominal output voltage under normal operation, thus allowing the threshold voltage and output voltage of the over-voltage protection loop to be set close to the nominal output voltage of the main servo loop circuit.
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Citations
1 Claim
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1. A method for providing over-voltage protection for a transformer using an over-voltage protection loop, the transformer to include a primary clock and feedback control circuit, a main servo loop circuit, and the over-voltage protection loop, the method comprising:
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providing a secondary side voltage by activating an over-voltage winding, the over-voltage winding being activated in response to a voltage on a primary winding in the primary clock and feedback control circuit; using the secondary side voltage to maintain a voltage on a first node of an error amplifier, the error amplifier being electrically coupled to a first node and a second node, wherein the voltage on the first node is maintained according to an internal reference voltage of the error amplifier; introducing a time delay to a feedback signal transmitted from the second node to the first node through a feedback impedance, the feedback impedance being electrically coupled between the first node and the second node; and controlling an output voltage at an output node based on the voltage at the first node using an output voltage sensing circuit electrically coupled to at least the first node and the output node, wherein the over-voltage protection loop provides the output voltage for the transformer under an error condition.
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Specification
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- Resources
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Current AssigneeCrane Electronics, Inc. (Crane Company)
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Original AssigneeCrane Electronics, Inc. (Crane Company)
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InventorsLam, Cuon, Nguyen, Khoa, Nguyen, Hach, Odell, Peter, Song, Sovann
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Primary Examiner(s)Tran, Thienvu
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Assistant Examiner(s)Comber, Kevin J
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Application NumberUS15/374,116Time in Patent Office256 DaysField of Search361 56US Class CurrentCPC Class CodesH02H 7/04 for transformersH02H 9/04 responsive to excess voltag...
