Fast transient step load response in a power converter
First Claim
1. A method of controlling a power converter having an output capacitor, a current sensor positioned on an output side of the output capacitor and at least one switching device for supplying an output voltage and a load current to a load, the method comprising:
- sampling sensing the output voltage;
the load current at a frequency sufficient to detect changing load current before the output voltage of the power converter changes;
controlling a duty cycle of the switching device according to the sensed output voltage and a voltage control loop when a rate of change of the load current does not exceed a threshold level greater than zero; and
adjusting the duty cycle of the switching device set by the voltage control loop when the rate of change of the load current exceeds the threshold level greater than zero.
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Abstract
A method of controlling a power converter having at least one switching device for supplying an output voltage and a load current to a load is disclosed. The method includes sensing the output voltage and sensing the load current. The method further includes controlling a duty cycle of the switching device according to the sensed output voltage and a voltage control loop when a rate of change of the load current does not exceed a threshold level. The method also includes adjusting the duty cycle of the switching device set by the voltage control loop when the rate of change of the load current exceeds the threshold level.
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Citations
21 Claims
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1. A method of controlling a power converter having an output capacitor, a current sensor positioned on an output side of the output capacitor and at least one switching device for supplying an output voltage and a load current to a load, the method comprising:
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sampling sensing the output voltage;
the load current at a frequency sufficient to detect changing load current before the output voltage of the power converter changes;controlling a duty cycle of the switching device according to the sensed output voltage and a voltage control loop when a rate of change of the load current does not exceed a threshold level greater than zero; and adjusting the duty cycle of the switching device set by the voltage control loop when the rate of change of the load current exceeds the threshold level greater than zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A power converter comprising an output capacitor, a current sensor positioned on an output side of the output capacitor, a controller and at least one switching device, the power converter configured to sample a load current at a frequency sufficient to detect changing load current before an output voltage of the power converter changes, the controller configured to control a duty cycle of the switching device according to a sensed output voltage and a voltage control loop when a rate of change of the load current does not exceed a threshold level greater than zero, and to adjust the duty cycle of the switching device set by the voltage control loop when the rate of change of the load current exceeds the threshold level greater than zero.
Specification