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US 6,958,552 B2Granted
Failsafe power oring with current sharing
AssigneeADC DSL Systems, Inc.
InventorGeorge Bertran Dodson, III
Life of this patent
Estimating the term…
Abstract
A current sharing circuit provides redundant power supplies with current sharing through the use of multiple feedback loops and existing circuit diodes to generate shared load current within predefined load voltage regulation requirements. A method of sharing current allows adjustment of the feedback loops to accommodate characteristics of the circuit.
Drawings
Claims18
A method of sharing current for multiple power sources, comprising:
- diode oring the outputs from each of the power sources;
- feeding back each power supply output signal through first and second loops, wherein the first loop is a direct raw output loop and the second loop is a diode filtered loop.
A method for current sharing in a redundant power supply system, comprising:
- combining at least two power supply outputs at a common load node;
- feeding back each power supply outputs through first and second loops, wherein the first loop is a direct raw output loop and the second loop is a diode filtered loop;
- and
- adjusting source resistance through the use of the feedback.
1 more element
A method of current sharing in a multiple source system, comprising:
- combining outputs of each of the multiple sources;
- applying a load to the combined outputs;
- and
- feeding back each output to a source input through a pair of feedback loops, wherein the first loop is a direct raw output loop and the second loop is a diode filtered loop.
1 more element
A current sharing circuit, comprising:
- first and second power sources;
- and
- first and second feedback loops for each power source, the feedback loops connected between an output of their respective source and a differential input of their respective source,
- wherein each first feedback loop is a direct raw output loop connected directly between the output of its respective source and a node connected to the differential input, and
- wherein each second feedback loop includes a diode having its anode connected to the output and wherein each second feedback loop is connected between the diode cathode and to the differential input.
2 more elements
A circuit, comprising:
- at least two power sources, each power source having a pair of differential inputs, each first differential input connectable to a respective precision voltage reference;
- a pair of diodes, each of the power sources having one of the pair of diodes connected to its respective output;
- a pair of first feedback loops, each first feedback loop connected between a first node between its respective source output and its diode and the other differential input of the respective power source;
- a pair of second feedback loops, each second feedback loop connected between its diode output and the other differential input of the respective power source;
- the outputs of the diodes connected to a common node load.
2 more elements
A method for redundantly supplying power to a load, comprising:
- diode oring outputs of two power supplies;
- regulating the power supplies by comparison to a precision voltage reference for each power supply;
- sensing an output voltage for each source;
- sensing a combined load voltage;
- and
- summing the sensed output voltages and combined load voltages.
3 more elements
A circuit, comprising:
- a first branch comprising:
- a first power source having a pair of differential inputs;
- a first power source reference potential connected to one of the first power source differential inputs;
- a first feedback loop connected between the output of the first power source and the other of the first power source differential inputs;
- a second feedback loop;
- a first diode connected between the output of the first power source and the second feedback loop, the second feedback loop also connected to the other of the first power source differential inputs;
- and
- a second branch comprising:
- a second power source having a pair of differential inputs;
- a second power source reference potential connected to one of the second power source differential inputs;
- a third feedback loop connected between the output of the second power source and the other of the second power source differential inputs;
- a fourth feedback loop;
- a second diode connected between the output of the second power source and the fourth feedback loop, the fourth feedback loop also connected to the other of the second power source differential inputs;
- and
- wherein the cathodes of the first and the second diodes are connected and are connectable to a load.
12 more elements
Dependencies are inferred from the claim text.