Switching regulator with ripple-based control and method for switching regulator with ripple-based control
AssigneeRealtek Semiconductor Corp.
InventorShih-Chieh Chen
Life of this patent
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Abstract
A ripple-based control switching regulator includes a switch, an inductor, a capacitor, an output voltage processing unit and a control unit. Where the switch is utilized to output selectively output a first reference voltage or a second reference voltage as an output voltage according to a control signal. The inductor is coupled to the switch, and produces an inductor output voltage according to the output voltage. The capacitor is coupled to the inductor. The output voltage processing unit is used to output a processed inductor output voltage according to the output voltage and the inductor output voltage. The control unit is used to output the control signal according to at least the processed inductor output voltage.
Claims11
A ripple-based control switching regulator, comprising:
- a switch, for selectively outputting a first reference voltage or a second reference voltage as an output voltage according to a control signal;
- an inductor, coupled to the switch, for producing an inductor output voltage according to the output voltage;
- a capacitor, coupled to the inductor;
- an output voltage processing unit, for outputting a processed inductor output voltage according to the output voltage and the inductor output voltage, wherein the output voltage processing unit comprises:
- a double pulse detecting unit, for detecting whether the output voltage has a double pulse to generate a detecting result;
- and
- a voltage calibrating unit, for generating the processed inductor output voltage according to the detecting result, the output voltage, and the inductor output voltage, wherein the voltage calibrating unit comprises:
- a calibrating circuit, for generating a calibrated output voltage according to the detecting result, the output voltage, and the inductor output voltage;
- and
- a differentiator, for differentiating the calibrated output voltage to generate the processed inductor output voltage;
- and
- a control unit, for outputting the control signal according to at least the processed inductor output voltage.
A ripple-based control switching regulating method for controlling a ripple-based control switching regulator comprising a switch, an inductor coupled to the switch, and a capacitor coupled to the inductor, the ripple-based control switching regulating method comprising:
- utilizing the switch for selectively outputting a first reference voltage or a second reference voltage as an output voltage according to a control signal;
- utilizing the inductor for producing an inductor output voltage according to the output voltage;
- outputting a processed inductor output voltage according to the output voltage and the inductor output voltage by performing the following steps:
- detecting whether the output voltage has a double pulse to generate a detecting result;
- and
- generating the processed inductor output voltage according to the detecting result, the output voltage, and the inductor output voltage by performing the following steps:
- generating a calibrated output voltage according to the detecting result, the output voltage, and the inductor output voltage;
- and
- differentiating the calibrated output voltage to generate the processed inductor output voltage;
- and
- utilizing a control unit for outputting the control signal according to at least the processed inductor output voltage.
Dependencies are inferred from the claim text.