Current regulator circuit capable of reducing current ripple and method of reducing current ripple
AssigneeRichtek Technology Corporation
InventorsYi-Wei Lee, Isaac Y. Chen
Life of this patent
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Abstract
The present invention discloses a current regulator circuit capable of reducing current ripple and a method of reducing current ripple. A power supply circuit generates a load current which originally has a current ripple. The load current is supplied to a load circuit. The current regulator circuit includes a regulator switch coupled to the load circuit, a current sense circuit for sensing the load current, and a control circuit. The control circuit controls the regulator switch to regulate a peak of a current sense signal minus an average of the current sense signal to a non-negative first predetermined value, or regulate the peak minus a valley of the current sense signal to a non-negative second predetermined value.
Claims24
A current regulator circuit, which is configured to operably regulate a load current flowing through a load circuit coupled to the current regulator circuit, wherein the load circuit is coupled to a power supply circuit which provides an output voltage and a load current to the load circuit, wherein the current regulator circuit is configured to operably reduce a current ripple in the load current, the current regulator circuit comprising:
- a regulator switch, which is configured to be operably coupled to the load circuit, and operate according to a control signal, to regulate the load current;
- a current sense circuit, which is coupled to the regulator switch, and configured to operably sense the load current to generate a current sense signal;
- and
- a control circuit, which is coupled to the regulator switch and the current sense circuit, and configured to operably generate a control signal for controlling the regulator switch according to the current sense signal, wherein the control circuit regulates a peak-to-average difference to a non-negative and fixed first predetermined value, wherein the peak-to-average difference is obtained according to a peak of the current sense signal minus an average of the current sense signal, or regulates a peak-to-valley difference to a non-negative and fixed second predetermined value, wherein the peak-to-valley difference is obtained according to the peak of the current sense signal minus a valley of the current sense signal.
A method of reducing current ripple, wherein a power supply circuit provides an output voltage and a load current to a load circuit, and the method of reducing current ripple is for reducing a current ripple in the load current, the method comprising:
- sensing the load current flowing through the load circuit to generate a current sense signal;
- generating a control signal according to the current sense signal;
- operating a regulator switch according to the control signal, to regulate the load current;
- and
- feedback controlling a peak-to-average difference to a non-negative and fixed first predetermined value, wherein the peak-to-average difference is obtained according to a peak of the current sense signal minus an average of the current sense signal, or feedback controlling a peak-to-valley difference to a non-negative and fixed second predetermined value, wherein the peak-to-valley difference is obtained according to the peak of the current sense signal minus a valley of the current sense signal.
Dependencies are inferred from the claim text.