Adaptive controller based on transient normalization

Abstract

A controller is provided for controlling a power stage of a power converter according to a control law, the control law implementing a specific type of compensator and being pre-designed to generate an objective response of a default power converter for a default parameter value of a component of the power stage. The controller is further configured to determine an actual response for an actual parameter value of the component of the power stage and to alter the control law for the actual parameter value of the component of the power stage such that the actual response matches the objective response. The controller determines a degree of matching between the actual response and the objective response by filtering the actual response to generate a filtered actual response and integrating a product of the filtered actual response and a delayed actual response.

1 . A controller for controlling a power stage of a power converter according to a control law, the control law implementing a specific type of compensator and being pre-designed to generate an objective response of a default power converter for a default parameter value of a component of the power stage;
 the controller being further configured to determine an actual response for an actual parameter value of the component of the power stage;   the controller being further configured to alter the control law for the actual parameter value of the component of the power stage such that the actual response matches the objective response by determining a degree of matching between the actual response and the objective response by filtering the actual response by an inverse filter of the objective response to generate a filtered actual response and integrating a product of the filtered actual response and a delayed actual response.   
     
     
         2 . The controller according to  claim 1 , wherein the delayed actual response is delayed by one sample. 
     
     
         3 . The controller according to  claim 1 , wherein a filter used for filtering the actual response comprises an inverse filter of the objective response such that an actual response that exactly matches the objective response results in a zero output from the filter apart from a first sample of the filtered actual response. 
     
     
         4 . The controller according to  claim 1 , wherein the controller is configured to scale a degree of matching between the actual response and the objective response to alter the control law. 
     
     
         5 . The controller according to  claim 4 , wherein the controller is configured to scale the degree of matching by a linear time invariant gain. 
     
     
         6 . The controller according to  claim 4 , wherein the controller is configured to scale the degree of matching by a gain that is dependent on the magnitude of the actual response. 
     
     
         7 . The controller according to  claim 6 , wherein the controller is configured to scale the degree of matching by a constant divided by a 2-norm of the actual response. 
     
     
         8 . The controller according to  claim 1 , further configured to alter the control law by selecting another type of compensator of a plurality of types of compensators and by altering the control law implementing the other type of compensator for an actual parameter value of the component of the power converter such that an objective response of the other type of compensator corresponding to the default power converter matches the actual response. 
     
     
         9 . The controller according to  claim 8 , further configured to optimize for a type of compensator of the plurality of types of compensators and the corresponding control law. 
     
     
         10 . A power converter comprising: a controller according to  claim 9 , and a non-volatile memory for storing the plurality of types of compensators. 
     
     
         11 . A method for controlling a power stage of a power converter according to a control law, the control law implementing a specific type of compensator, the method comprising:
 providing the control law being pre-designed to generate an objective response of a default power converter for a default parameter value of a component of the power stage;   determining an actual response for an actual parameter value of the component of the stage; and   altering the control law for the actual parameter value of the component of the power stage such that the actual response matches the objective response by determining a degree of matching between the actual response and the objective response by filtering the actual response by an inverse filter of the objective response to generate a filtered actual response and integrating a product of the filtered actual response and a delayed actual response.   
     
     
         12 . The method according to  claim 11 , further comprising: delaying the actual response by one sample. 
     
     
         13 . The method according to  claim 11 , wherein filtering the actual response comprises using an inverse filter of the objective response such that an actual response that exactly matches the objective response results in a zero output from the filter apart from a first sample of the filtered actual response. 
     
     
         14 . The method according to  claim 11 , wherein altering the control law comprises: selecting another type of compensator of a plurality of types of compensators and altering the control law implementing the other type of compensator for an actual parameter value of the component of the power stage such that the actual response matches the objective response of the other type of compensator. 
     
     
         15 . The method according to  claim 13 , further comprising:
 optimizing for a type of compensator of the plurality of types of compensators and the corresponding control law.