System and method for limting currents in a power distribution system
First Claim
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1. A power distribution system, comprising:
- a bipolar direct current (DC) source with a positive voltage lead and a negative voltage lead;
an electrical load capable of drawing electrical power from the bipolar DC source;
a set of switching components configured to selectively connect power from the bipolar DC source to the electrical load by switching between an open state that disconnects power from the bipolar DC source to the electrical load and a closed state that connects power from the bipolar DC source to the electrical load, wherein a first switching component is connected to the positive lead of the bipolar DC source and a second switching component is connected to the negative lead of the bipolar DC source, and wherein each of the switching components includes a switch, a current limiting device, and a controller module; and
a current limiter module connected with an output of the first switch of the first switching component and the output of the second switch of the second switching component, the current limiter module including a bias value related to at least one of the first switch or the second switch, and the current limiter module adapted to determine a voltage sharing balance between the first switch and the second switch;
wherein only the current limiting device of the first switching component is adapted to modify a current limiting characteristic in response to a determination that voltage sharing is unbalanced between the first switching component and the second switching component, by the current limiter module adjusting the control signal sent from the controller module to the current limiting device of the first switching component.
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Abstract
An apparatus and method for controlling voltage sharing between a set of switching components can include applying power from a current source with a positive lead and a negative lead, closing the set of switching components to connect power from the current source to an electrical load, detecting a set of voltage values for the set of switching components, and controlling a current limiting function of at least one of the set of switching components.
8 Citations
18 Claims
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1. A power distribution system, comprising:
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a bipolar direct current (DC) source with a positive voltage lead and a negative voltage lead; an electrical load capable of drawing electrical power from the bipolar DC source; a set of switching components configured to selectively connect power from the bipolar DC source to the electrical load by switching between an open state that disconnects power from the bipolar DC source to the electrical load and a closed state that connects power from the bipolar DC source to the electrical load, wherein a first switching component is connected to the positive lead of the bipolar DC source and a second switching component is connected to the negative lead of the bipolar DC source, and wherein each of the switching components includes a switch, a current limiting device, and a controller module; and a current limiter module connected with an output of the first switch of the first switching component and the output of the second switch of the second switching component, the current limiter module including a bias value related to at least one of the first switch or the second switch, and the current limiter module adapted to determine a voltage sharing balance between the first switch and the second switch; wherein only the current limiting device of the first switching component is adapted to modify a current limiting characteristic in response to a determination that voltage sharing is unbalanced between the first switching component and the second switching component, by the current limiter module adjusting the control signal sent from the controller module to the current limiting device of the first switching component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power distribution system for an aircraft, comprising:
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a bipolar direct current (DC) source with a positive voltage lead and a negative voltage lead; an electrical load capable of drawing electrical power from the bipolar DC source; a set of switching components configured to selectively connect power from the bipolar DC source to the electrical load by switching between an open state that disconnects power from the bipolar DC source to the electrical load and a closed state that connects power from the bipolar DC source to the electrical load, wherein a first switching component is connected to the positive lead of the bipolar DC source and a second switching component is connected to the negative lead of the bipolar DC source, and wherein each of the first switching component and the second switching component includes a switch, a current limiting device, and a controller module; a first voltage sensor disposed across the first switch of the first switching component and adapted to sense the voltage dropped across the first switch and a second voltage sensor disposed across the second switch of the second switching component and adapted to sense the voltage dropped across the second switch; and a current limiter module adapted to receive the voltage dropped across the first switch and the voltage dropped across the second switch, and adapted to determine a voltage sharing balance between the first switch and the second switch; wherein only the current limiting device of the first switching component is adapted to modify a current limiting characteristic in response to a determination that voltage sharing is unbalanced between the first switching component and the second switching component, by the current limiter module adjusting the control signal sent from the controller module to the current limiting device of the first switching component. - View Dependent Claims (14, 15)
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16. A method of controlling voltage sharing between a set of switching components, each of the set of switching components including a switch, a current limiting device, and a controller module, the method comprising:
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applying power from a bipolar direct current (DC) source with a positive voltage lead and a negative voltage lead; closing each of the switches of the set of switching components to connect power from the bipolar DC source to an electrical load, wherein the set of switching components are in series with the electrical load; detecting a set of voltage values across the set of switching components; determining an imbalance between the voltage values for the set of switching components in a current limiter module by applying a bias value to at least one of the voltage values, and wherein the bias value is related to a desired power sharing ratio between the set of switching components; and dynamically controlling a current limiting device of only one of the set of switching components to correct the imbalance between the voltage values for the set of switching components, by the current limiter module adjusting the control signal sent from the controller module to the current limiting device of the only one of the set of switching components. - View Dependent Claims (17, 18)
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Specification