Power converter and method of operating the same
AssigneeNXP B.V.
InventorsMelaine Philip, Fabien Boitard
Life of this patent
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Abstract
In accordance with a first aspect of the present disclosure, a power converter is disclosed, comprising: an input configured to receive an input voltage; an output configured to provide an output voltage; a power switching block coupled between the input and the output; a controller configured to control the power switching block, wherein the controller is configured to open and close switches comprised in the power switching block, wherein the controller is further configured to control a resistance of the power switching block. In accordance with a second aspect of the present disclosure, a corresponding method of operating a power converter is conceived.
Claims18
A power converter comprising:
- an input configured to receive an input voltage;
- an output configured to provide an output voltage;
- a power switching block coupled between the input and the output;
- a controller comprising:
- a comparator coupled to compare the output voltage with a reference voltage to generate a comparison result;
- a first logic circuit coupled to receive a clock signal having a fixed frequency and the comparison result, and to provide a pulse width modulation signal having the fixed frequency;
- a power switch resistance circuit configured to provide a resistance control signal for controlling a resistance of the power switching block in response to detecting changes in the output voltage;
- and
- a second logic circuit having a first input for receiving the pulse width modulation signal, a second input for receiving the resistance control signal, and an output for providing a switch control signal to the open and close switches of the power switching block at the fixed frequency, wherein the second logic circuit comprises an AND logic function.
A method of operating a power converter, the power converter comprising an input, an output, a controller and a power switching block coupled between the input and the output, the method comprising:
- receiving an input voltage on the input;
- providing an output voltage on the output;
- comparing the output voltage with a reference voltage to generate a comparison result;
- receiving, by a first logic circuit, a clock signal having a fixed frequency and the comparison result, and to provide a pulse width modulation signal having the fixed frequency;
- providing, by a power switch resistance circuit, a resistance control signal for controlling a resistance of the power switching block in response to detecting changes in the output voltage;
- and
- receiving the pulse width modulation signal at a first input of a second logic circuit, and
- receiving a resistance control signal at a second input of the second logic circuit, and providing at an output of the second logic circuit a switch control signal to open and close switches of the power switching block at the fixed frequency,
- wherein the controller initiates an increase of the resistance if the output voltage exceeds a targeted set point after half a switching period.
Dependencies are inferred from the claim text.