Multi-module current sharing scheme
AssigneeIntersil Americas Inc.
InventorsChun Cheung, Stan Wietecha
Life of this patent
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Abstract
A circuit provides multi-module current sharing for circuit modules. The circuit includes an error amplifier having a negative and a positive input and an output. The positive input of the error amplifier is connected to a reference voltage. A buffered differential amplifier has an output connected to the negative input of the error amplifier and a positive and a negative input. A correction current is sourced to the negative input of the buffered differential amplifier. A resistor connected to the negative input of the buffered differential amplifier has a value that controls the amount of current correction applied to the negative input of the buffer differential amplifier by the current correction source.
Claims16
A multimodule current sharing system, comprising:
- a plurality of power modules sharing current on a common bus;
- wherein each of the plurality of power modules includes circuitry for controlling an amount of current correction applied to each of the plurality of power modules, wherein the circuitry for controlling further includes;
- first circuitry for generating an error voltage responsive to a reference voltage and an output voltage;
- a correction current source applied to the first circuitry wherein a current provided by the correction current source includes a combination of a current of one of the plurality of power modules and a selected offset current subtracted from an average current of each of the plurality of power modules;
- and
- a first resistor connected to the first circuitry, wherein a value of the first resistor controls the amount of voltage correction applied to the first circuitry by the correction circuit source, wherein the value of the first resistor may further enable or disable current sharing among the plurality of power modules.
A multimodule current sharing system, comprising:
- a plurality of power modules sharing current on a common bus;
- and
- wherein each of the plurality of power modules includes circuitry for controlling an amount of current correction applied to each of the plurality of power modules, said circuitry comprising:
- an error amplifier having a negative and a positive input and an output, the positive input of the error amplifier connected to a reference voltage;
- a buffered differential amplifier having an output connected to the negative input of the error amplifier and a positive and a negative input;
- a correction current source applied to the negative input of the buffered differential amplifier;
- and
- a first resistor connected to the negative input of the buffered differential amplifier, wherein a value of the first resistor controls the amount of voltage correction applied to the negative input of the buffered differential amplifier by the correction current source, the first resistor further enabling and disabling current sharing responsive to a value of the first resistor.
A circuit for providing multimodule current sharing for a circuit module, comprising:
- an error amplifier having a negative and a positive input and an output, the positive input of the error amplifier connected to a reference voltage;
- a buffered differential amplifier having an output connected to the negative input of the error amplifier and a positive and a negative input;
- a correction current source applied to the negative input of the buffered differential amplifier;
- and
- a first resistor connected to the negative input of the buffered differential amplifier, wherein a value of the first resistor controls the amount of voltage correction applied to the negative input of the buffered differential amplifier by the current correction source.
Dependencies are inferred from the claim text.