Phase shedding control method used in multiphase switching converters with daisy chain configuration
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsLijie Jiang, Yongheng Sun
Life of this patent
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Abstract
A multiphase switching converter with automatic phase shedding control, wherein the multiphase switching converter includes a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain and respectively configured for driving a corresponding one of the plurality of switching circuits. Each of the control circuit generates a current threshold based on a corresponding sequence information, and compares a current indication signal indicative of a load current of the multiphase switching converter with the current threshold to determine whether to enter into a phase shedding mode.
Claims20
A control circuit used in a multiphase switching converter, wherein the multiphase switching converter includes a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain, the control circuit comprises:
- a first terminal configured to share a phase control signal with the rest of the plurality of control circuits;
- a second terminal configured to receive a phase input signal from a previous control circuit in the daisy chain;
- and
- a third terminal configured to provide a phase output signal to a latter control circuit in the daisy chain;
- wherein
- based on the phase input signal and phase control signal, the control circuit generates the phase output signal, and a switch control signal for controlling a corresponding one of the plurality of switching circuits;
- and wherein
- the control circuit generates a current threshold based on a sequence information, and compares a current indication signal indicative of a load current of the multiphase switching converter with the current threshold to determine whether to enter into a phase shedding mode.
A multiphase switching converter comprising:
- a plurality of switching circuits coupled in parallel between an input voltage and a load;
- and
- a plurality of control circuits configured in a daisy chain and respectively configured for driving a corresponding one of the plurality of switching circuits;
- wherein
- each of the plurality of control circuits includes:
- a first terminal configured to share a phase control signal with the rest of the plurality of control circuits;
- a second terminal configured to receive a phase input signal from a previous control circuit in the daisy chain;
- and
- a third terminal configured to provide a phase output signal to a latter control circuit in the daisy chain;
- wherein
- the control circuit generates a current threshold based on a corresponding sequence information, and compares a current indication signal indicative of a load current of the multiphase switching converter with the current threshold to determine whether to enter into a phase shedding mode;
- and wherein
- in the phase shedding mode, the control circuit stops the corresponding switching circuit from providing power to the load, and gets the phase output signal to be substantially identical to the phase input signal.
A phase shedding control method used in a control circuit of a multiphase switching converter, wherein the multiphase switching converter includes a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain and respectively configured for driving a corresponding one of the plurality of switching circuits, the phase shedding control method comprises:
- obtaining a current indication signal indicative of a load current of the multiphase switching converter;
- obtaining a sequence information of the control circuit;
- generating a current threshold based on the sequence information;
- and
- comparing the current indication signal with the current threshold to determine whether to disable the corresponding switching circuit of the control circuit.
Dependencies are inferred from the claim text.