US 8,009,446 B2 · Ripple voltage suppression method for DC/DC converter and apparatus thereof

Abstract

A ripple voltage suppression apparatus includes a DC/DC converter and a control circuit. The DC/DC converter has a power electronic switch. The control circuit has a voltage detector detecting a DC output voltage of the DC/DC converter, a ripple voltage suppression circuit receiving the detected DC output voltage to generate an AC control signal for controlling an AC component of a duty ratio of the power electronic switch, an output voltage regulation circuit receiving the detected DC output voltage to generate a DC control signal for controlling an DC component of a duty ratio, an adder adding the AC and DC control signals to form a combined control signal, and a PWM circuit converting the combined control signal into a PWM signal to control the power electronic switch. Only the DC output voltage of the DC/DC converter has to be detected for the control circuit.

Claims11

Dependent claims

A ripple voltage suppression apparatus, comprising:

a DC/DC converter having a power electronic switch;
and
a control circuit having a voltage detector to detect a DC output voltage of the DC/DC power converter, a ripple voltage suppression circuit receiving the detected DC output voltage to generate an AC control signal for controlling an AC component of a duty ratio of the power electronic switch, an output voltage regulation circuit receiving the detected DC output voltage to generate a DC control signal for controlling an DC component of the duty ratio, an adder adding the AC and DC control signals to form a united control signal, and a PWM circuit converting the united control signal into a PWM signal to control the power electronic switch;
wherein only the DC output voltage of the DC/DC converter has to be detected to function the control circuit.

1 more element

A ripple voltage suppression method for controlling a power electronic switch of a DC/DC converter by a control circuit, comprising:

receiving an output voltage of the DC/DC converter by a voltage detector;
inputting the detected output voltage of the DC/DC converter to the control circuit;
generating an AC control signal and a DC control signal respectively by a ripple voltage suppression circuit and an output voltage regulation circuit of the control circuit, with the AC control signal being used to control an AC component of a duty ratio of the power electronic switch and the DC control signal being used to control a DC component of the duty ratio of the power electronic switch;
adding the AC control signal and the DC control signal to form a united control signal and then inputting the united control signal into a PWM circuit to obtain a PWM signal;
and
sending the PWM signal to the power electronic switch for controlling the power electronic switch.

3 more elements

Dependencies are inferred from the claim text.

Ripple voltage suppression method for DC/DC converter and apparatus thereof

Life of this patent

Ripple voltage suppression method for DC/DC converter and apparatus thereof

Life of this patent

Abstract

Claims11