US 2011/0215782 A1 · Power regulator and controlling method thereof

Abstract

Methods and circuits related to power regulation are disclosed. In one embodiment, a power regulator for converting an input electrical signal to an output electrical signal to supply power to a load, can include: (i) a power stage having switching devices and a filter; (ii) a regulation signal generator for the switching devices that includes a feedback circuit and a PWM, the feedback circuit receiving an output signal from the power stage, the PWM receiving an output from the feedback circuit, and generating a PWM control signal; (iii) a constant time generator receiving the PWM control signal and generating a constant time signal based on the PWM control signal duty cycle; and (iv) a logic/driving circuit receiving the PWM control signal and the constant time signal, and controlling operation of the switching devices to modulate the output signal from the power stage, and maintaining a pseudo constant operation frequency.

Claims9

Dependent claims

A power regulator for converting an input electrical signal to an output electrical signal to supply power to a load, said power regulator comprising:

a) a power stage having switching devices and a filter;
b) a regulation signal generator for said switching devices, wherein said regulation signal generator comprises a feedback circuit and a pulse width modulator (PWM), said feedback circuit being configured to receive an output signal from said power stage, said PWM being configured to receive an output from said feedback circuit, and to generate a PWM control signal;
c) a constant time generator configured to receive said PWM control signal and generate a constant time signal based on a duty cycle of said PWM control signal;
and
d) a logic/driving circuit configured to receive said PWM control signal and said constant time signal, and to control operation of said switching devices to modulate said output signal from said power stage, and to maintain a pseudo constant operation frequency.

2 more elements

A method of controlling regulation of an output of a power regulator, the method comprising:

a) sampling said output of said power regulator using a feedback circuit;
b) receiving an output from said feedback circuit using a pulse width modulator (PWM), and generating a PWM control signal;
c) generating a constant time signal using a constant time generator based on a duty cycle of said PWM control signal;
and
d) receiving said PWM control signal and said constant time signal using a logic/driving circuit, and in response, controlling operation of switching devices of a power stage to regulate said output of said power regulator to maintain a pseudo constant operation frequency for said switching devices.

2 more elements

Dependencies are inferred from the claim text.

Power regulator and controlling method thereof

Life of this patent

Power regulator and controlling method thereof

Life of this patent

Abstract

Claims9