Method and apparatus for regulating converter by reducing a ripple component

1 . A method of regulating a converter, the method comprising:

extracting a ripple voltage in a first frequency band from an input voltage of the converter, the ripple voltage being associated with a ripple component in the input voltage; and

regulating a parameter of the converter based on at least the ripple voltage to reduce the ripple component in the first frequency band in an output of the converter,

wherein regulating the parameter of the converter comprises:

regulating, based on an amplitude of the ripple voltage, one or more of a pulse width, a frequency, and a phase shift angle of the converter,

wherein extracting the ripple voltage comprises:

determining a quasi-peak voltage value associated with a quasi-peak value of the input voltage via a quasi-peak filter, wherein the quasi-peak filter further comprises:

an operational amplifier having an inverting input end and a non-inverting input end connected to an input end of the quasi-peak filter;

a diode, wherein a first end of the diode is connected to an output end of the operational amplifier and a second end of the diode is connected to the first end of the diode and the inverting input end of the operational amplifier;

a resistor, wherein a first end of the resistor is connected to the second end of the diode and a second end of the resistor is connected to an output end of the quasi-peak filter; and

a capacitor, wherein a first end of the capacitor is connected to the output end of the quasi-peak filter and a second end of the capacitor is connected to a reference end.

2 . The method of claim 1 , wherein extracting the ripple voltage further comprises:

determining, via a divider resistor, an instantaneous voltage value associated with an instantaneous value of the input voltage; and

extracting, via an amplifier coupled to the quasi-peak filter and the divider resistor, the ripple voltage based on a difference between the quasi-peak voltage value and the instantaneous voltage value.

3 . The method of claim 1 , wherein the quasi-peak filter comprises a passive filter or an active filter.

4 . The method of claim 1 , wherein the converter is included in a wireless charger.

5 . An apparatus for regulating a converter, the apparatus comprising:

a ripple extraction module configured to extract a ripple voltage in a first frequency band from an input voltage of the converter, the ripple voltage being associated with a ripple component in the input voltage; and

a parameter regulation module configured to regulate a parameter of the converter based on at least the ripple voltage to reduce the ripple component in the first frequency band in an output of the converter,

wherein the parameter regulation module is configured to:

regulate, based on an amplitude of the ripple voltage, one or more of a pulse width, a frequency, and a phase shift angle of the converter,

wherein the ripple extraction module comprises a quasi-peak filter configured to determine a quasi-peak voltage value associated with a quasi-peak value of the input voltage, wherein the quasi-peak filter further comprises:

an operational amplifier having an inverting input end and a non-inverting input end connected to an input end of the quasi-peak filter;

a diode, wherein a first end of the diode is connected to an output end of the operational amplifier and a second end of the diode is connected to the first end of the diode and the inverting input end of the operational amplifier;

a resistor, wherein a first end of the resistor is connected to the second end of the diode and a second end of the resistor is connected to an output end of the quasi-peak filter; and

a capacitor, wherein a first end of the capacitor is connected to the output end of the quasi-peak filter and a second end of the capacitor is connected to a reference end.

6 . The apparatus of claim 5 , wherein the ripple extraction module further comprising:

a divider resistor configured to determine an instantaneous voltage value associated with an instantaneous value of the input voltage; and

an amplifier coupled to the quasi-peak filter and the divider resistor and configured to extract the ripple voltage based on a difference between the quasi-peak voltage value and the instantaneous voltage value.

7 . The apparatus of claim 5 , wherein the quasi-peak filter comprises a passive filter or an active filter.

8 . The apparatus of claim 5 , wherein the converter is included in a wireless charger.