Switching power converter control
AssigneePowerVenture Semiconductor Limited
InventorChi-Chia Huang
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Abstract
A switching power converter with good stability and transient response is presented. There is provided a controller for a switching power converter of the type comprising one or more power switches. The controller contains a pulse width modulation comparator arranged to output a digital control signal to control the power switches of the switching power converter. A first input of the pulse width modulation comparator is derived from an output voltage of the switching power converter via a first feedback path. A second input of the pulse width modulation comparator is derived from the output voltage of the switching power converter via a second feedback path. One of the feedback paths has a signal extractor and a differential amplifier arranged to filter the output voltage and to provide good ground noise rejection.
Claims22
A controller for a switching power converter of the type comprising one or more power switches, said controller comprising:
- a pulse width modulation comparator arranged to output a digital control signal to control the power switches of the switching power converter;
- a first input of the pulse width modulation comparator is derived from an output voltage of the switching power converter via a first feedback path;
- a second input of the pulse width modulation comparator is derived from the output voltage of the switching power converter via a second feedback path;
- wherein
- one of the feedback paths comprises a signal extractor and a differential amplifier;
- and
- the signal extractor is arranged to filter the output voltage to obtain a first voltage signal in a first frequency range and a second voltage signal in a second frequency range being different from said first frequency range, said first and second voltage signals sharing a common noise component;
- and to present said first and second voltage signals as respective first and second inputs to the differential amplifier.
A method of controlling the operation of a switching power converter of the type comprising a pulse width modulation comparator and one or more power switches, said method comprising:
- deriving a first PWM input from an output voltage and presenting the input via a first feedback path;
- deriving a second PWM input from an output voltage and presenting the input via a second feedback path;
- at one of said paths, filtering the output voltage to obtain a first voltage signal in a first frequency range and a second voltage signal in a second frequency range being different from said first frequency range, said first and second voltage signals sharing a common noise component;
- and
- presenting said first and second voltage signals as respective first and second inputs to a differential amplifier.
Dependencies are inferred from the claim text.