US 12,651,958 B2 · Ripple control for a capacitor between a PFC and a DC/DC converter

Abstract

The present disclosure discloses a method and a system for controlling a switching power supply, the switching power supply comprising a power factor correction circuit which comprises at least one electrolytic capacitor, the method comprising: detecting a ripple voltage of the electrolytic capacitor; controlling an actual output power of the switching power supply to be equal to a reference output power based on the ripple voltage of the electrolytic capacitor, wherein the reference output power equals to a compensated output power or an upper limit output power, and wherein the compensated output power is obtained by comparing the ripple voltage of the electrolytic capacitor with a reference voltage and subjecting to a compensation calculation. The reference output power is a smaller one of the compensated output power and the upper limit output power.

Claims24

Dependent claims

A method for controlling a switching power supply, the switching power supply comprising a power factor correction circuit and a DC/DC converter that are cascaded, the method comprising:

detecting a ripple voltage of a electrolytic capacitor on an output bus of the power factor correction circuit;
and
controlling an actual output power of the DC/DC converter to be a reference value of output power based on the ripple voltage of the electrolytic capacitor, wherein the reference value of output power is a compensated output power or an upper limit output power, wherein the compensated output power is obtained by comparing the ripple voltage of the electrolytic capacitor with a reference voltage and then subjecting to a compensation calculation, wherein
when the compensated output power is less than the upper limit output power, the reference value of output power is the compensated output power;
and
when the compensated output power is greater than or equal to the upper limit output power, the reference value of output power is the upper limit output power.

3 more elements

A system for controlling a switching power supply, the switching power supply comprising a power factor correction circuit and a DC/DC converter that are cascaded, the system comprising:

a detection unit configured to detect a ripple voltage of a electrolytic capacitor on an output bus of the power factor correction circuit;
and
a control unit configured to control an actual output power of the DC/DC converter to be a reference value of output power based on the ripple voltage of the electrolytic capacitor;
wherein the reference value of output power is a compensated output power or an upper limit output power, wherein the compensated output power is obtained by comparing the ripple voltage of the electrolytic capacitor with a reference voltage and subjecting to a compensation calculation, wherein
when the compensated output power is less than the upper limit output power, the reference value of output power is the compensated output power;
when the compensated output power is greater than or equal to the upper limit output power, the reference value of output power is to the upper limit output power.

3 more elements

Dependencies are inferred from the claim text.

Ripple control for a capacitor between a PFC and a DC/DC converter

Life of this patent

Ripple control for a capacitor between a PFC and a DC/DC converter

Life of this patent

Abstract

Claims24