Adaptive control system
AssigneePowervation Limited
InventorAnthony Kelly
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Abstract
The present application provides an adaptive control system for controlling a plant in particular a DC-DC power converter. The control system has two controllers of differing characteristics. The output of the individual controllers H0 and H1 are combined together to provide a combined control signal H to the plant, where H=αH1+(1−α)H0 and where the adaptive control system is tuned by adjusting the value of α between 0 and 1 to find an optimum control position.
Claims18
An adaptive control system for controlling a DC-DC converter to provide a constant output, the adaptive control system comprising:
- a plurality of non-adaptive controllers each of the individual non-adaptive controllers responsive to at least one common input,
- each individual controller having a distinct control function and providing an output suitable for controlling the output of the DC-DC converter, wherein the outputs from the non-adaptive controllers are individually scaled by scaling values and summed together to provide a weighted sum control signal output to control the output of the DC-DC converter where the sum of the scaling values is maintained constant, wherein the adaptive control system further comprises a tuner for adjusting the individual scaling values in an effort to determine an optimum balance between the non-adaptive controllers and wherein the tuner determines the scaling values by minimizing a mean square value of a signal in the control system.
An adaptive controller for controlling an output voltage of a DC-DC converter the adaptive controller comprising:
- a first non-adaptive controller suitable for controlling the output voltage and providing a first control signal,
- a second non-adaptive controller suitable for controlling the output voltage and providing a second control signal,
- a first gain element for scaling the first control signal with a first scaling factor to provide a scaled first control signal, a second gain element for scaling the second control signal with a second scaling factor to provide a scaled second control signal, a summer for summing the scaled first and scaled second control signals, wherein the adaptive controller is configured to adjust a balance between the scaling factors whilst maintaining the sum of their scaling values constant and wherein the scaling factors are determined by minimizing a mean square value of a signal in the control system.
A method for adaptively controlling an output of a DC-DC converter, the method comprising the steps of:
- selecting a first controller for implementing a first control function;
- selecting a second controller for implementing a second control function;
- installing said first and said second controllers;
- applying the first control function to obtain a first control signal for maintaining the DC-DC converter output at a desired value, applying the second control function to obtain a second control signal for maintaining the DC-DC converter output at a constant desired value, balancing the first and second control signals to provide a balanced control signal, applying the balanced control signal to the DC-DC converter to maintain the output at the desired value, and adjusting the balance between the first and second control signals so as to find an optimum balance position whilst seeking to maintain the output from the DC-DC converter constant and wherein scaling factors for the first and second control signals are determined by minimizing a mean square value of a signal in the control system.
Dependencies are inferred from the claim text.