US 8,526,203 B2Granted

Systems and methods for constant voltage mode and constant current mode in flyback power converter with primary-side sensing and regulation

AssigneeOn-Bright Electronics (Shanghai) Co., Ltd.

InventorsXiaomin Huang, Yaming Cao, Xiuhong Zhang, Lieyi Fang

Life of this patent

Estimating the term…

Loading patent…

Abstract

System and method for regulating a power converter. The system includes a first signal generator configured to receive at least an input signal and generate at least a first output signal associated with demagnetization and a second output signal associated with sampling. Additionally, the system includes a sampling component configured to receive at least the input signal and the second output signal, sample the input signal based on at least information associated with the second output signal, and generate at least a third output signal associated with one or more sampled magnitudes. Moreover, the system includes an error amplifier configured to receive at least the third output signal and a first threshold voltage and generate at least a fourth output signal with a capacitor, the capacitor being coupled to the error amplifier.

Claims33

Dependent claims

A system for regulating a power converter, the system comprising:

a first signal generator configured to receive at least an input signal and generate at least a first output signal associated with demagnetization and a second output signal associated with sampling;
a sampling component configured to receive at least the input signal and the second output signal, sample the input signal based on at least information associated with the second output signal, and generate at least a third output signal associated with one or more sampled magnitudes;
an error amplifier configured to receive at least the third output signal and a first threshold voltage and generate at least a fourth output signal with a capacitor, the capacitor being coupled to the error amplifier;
a compensation component configured to receive at least the fourth output signal and generate at least a compensation signal, the input signal being a combination of the compensation signal and a first sensed signal, the first sensed signal being associated with a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
a first controller for regulating at least the output current, the first controller being configured to receive at least the first output signal and the third output signal and generate at least a first control signal based on at least information associated with the first output signal and the third output signal;
a second controller for regulating at least the output voltage, the second controller being configured to receive at least the fourth output signal and generate at least a second control signal and a third control signal based on at least information associated with the fourth output signal;
an oscillator configured to receive at least the first control signal and the second control signal and generate at least a clock signal;
a second signal generator configured to receive at least the clock signal, the third control signal, and a fourth control signal, and generate at least a modulation signal;
a gate driver configured to receive at least the modulation signal and output at least a drive signal to a switch, the switch being configured to affect a first current flowing through a primary winding coupled to the secondary winding;
and
a third controller for regulating at least a peak current, the third controller being configured to receive the third control signal, a second sensed signal, and a second threshold voltage, and output the fourth control signal to the second signal generator, the second sensed signal being associated with the first current flowing through the primary winding for the power converter.

8 more elements

A system for regulating a power converter, the system comprising:

a sampling component configured to receive at least an input signal, sample the input signal, and generate at least a first output signal associated with one or more sampled magnitudes, the input signal being associated with at least a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
an error amplifier configured to receive at least the first output signal and a threshold voltage, generate a second output signal with a capacitor, and generate a third output signal, the capacitor being coupled to the error amplifier;
a feed forward component configured to receive the third output signal and generate a fourth output signal based on at least information associated with the third output signal;
a controller for regulating at least the output voltage, the controller being configured to receive at least the second output signal and the fourth output signal, and generate at least a first control signal;
a signal generator configured to receive at least the first control signal and generate at least a modulation signal based on at least information associated with the first control signal;
and
a gate driver configured to receive at least the modulation signal and output at least a drive signal to a switch, the switch being configured to affect a first current flowing through a primary winding coupled to the secondary winding.

4 more elements

A system for regulating a power converter, the system comprising:

a first signal generator configured to receive at least an input signal and generate at least a first output signal associated with demagnetization and a second output signal associated with sampling, the input signal being associated with at least a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
a sampling component configured to receive at least the input signal and the second output signal, sample the input signal based on at least information associated with the second output signal, and generate at least a third output signal associated with one or more sampled magnitudes;
a first controller for regulating at least the output current, the first controller being configured to receive at least the first output signal and the third output signal and generate at least a first control signal based on at least information associated with the first output signal and the third output signal;
an oscillator configured to receive at least the first control signal and generate at least a clock signal based on at least information associated with the first control signal;
a second signal generator configured to receive at least the clock signal and a second control signal, and generate at least a modulation signal based on at least information associated with the clock signal and the second control signal;
a gate driver configured to receive at least the modulation signal and output at least a drive signal to a switch, the switch being configured to affect a first current flowing through a primary winding coupled to the secondary winding;
and
a third controller for regulating at least a peak current, the third controller being configured to receive at least a sensed signal and a threshold voltage, and output the second control signal to the second signal generator, the sensed signal being associated with the first current flowing through the primary winding for the power converter;
wherein:
the modulation signal corresponds to a switching frequency;
and
the first output signal corresponds to a demagnetization pulse width.

9 more elements

A method for regulating a power converter, the method comprising:

receiving at least an input signal by a first signal generator;
generating at least a first output signal associated with demagnetization and a second output signal associated with sampling based on at least information associated with the input signal;
receiving at least the input signal and the second output signal by a sampling component;
sampling the input signal based on at least information associated with the second output signal;
generating at least a third output signal associated with one or more sampled magnitudes;
receiving at least the third output signal and a first threshold voltage by an error amplifier;
generating at least a fourth output signal with a capacitor coupled to the error amplifier;
receiving at least the fourth output signal by a compensation component;
generating at least a compensation signal based on at least information associated with the fourth output signal, the input signal being a combination of the compensation signal and a first sensed signal, the first sensed signal being associated with a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
receiving at least the first output signal and the third output signal by a first controller for regulating at least the output current;
generating at least a first control signal based on at least information associated with the first output signal and the third output signal;
receiving at least the fourth output signal by a second controller for regulating at least the output voltage;
generating at least a second control signal and a third control signal based on at least information associated with the fourth output signal;
receiving at least the first control signal and the second control signal by an oscillator;
generating at least a clock signal by the oscillator;
receiving at least the clock signal, the third control signal, and a fourth control signal by a second signal generator;
generating at least a modulation signal by the second signal generator;
receiving at least the modulation signal by a gate driver;
outputting at least a drive signal to a switch to affect a first current flowing through a primary winding coupled to the secondary winding;
receiving the third control signal, a second sensed signal, and a second threshold voltage by a third controller for regulating at least a peak current;
and
outputting the fourth control signal to the second signal generator, the second sensed signal being associated with the first current flowing through the primary winding for the power converter.

19 more elements

A method for regulating a power converter, the method comprising:

receiving at least an input signal by a sampling component, the input signal being associated with at least a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
sampling the input signal by the sampling component;
generating at least a first output signal associated with one or more sampled magnitudes;
receiving at least the first output signal and a threshold voltage by an error amplifier;
generating a second output signal with a capacitor coupled to the error amplifier;
generating a third output signal by the error amplifier;
receiving the third output signal by a feed forward component;
generating a fourth output signal based on at least information associated with the third output signal;
receiving at least the second output signal and the fourth output signal by a controller for regulating at least the output voltage;
generating at least a first control signal based on at least information associated with the second output signal and the fourth output signal;
receiving at least the first control signal by a signal generator;
generating at least a modulation signal based on at least information associated with the first control signal;
receiving at least the modulation signal by a gate driver;
and
outputting at least a drive signal to a switch to affect a first current flowing through a primary winding coupled to the secondary winding.

12 more elements

A method for regulating a power converter, the method comprising:

receiving at least an input signal by a first signal generator, the input signal being associated with at least a first winding coupled to a secondary winding for a power converter, the secondary winding being related to an output current and an output voltage for the power converter;
generating at least a first output signal associated with demagnetization and a second output signal associated with sampling based on at least information associated with the input signal;
receiving at least the input signal and the second output signal by a sampling component;
sampling the input signal based on at least information associated with the second output signal;
generating at least a third output signal associated with one or more sampled magnitudes;
receiving at least the first output signal and the third output signal by a first controller for regulating at least the output current;
generating at least a first control signal based on at least information associated with the first output signal and the third output signal;
receiving at least the first control signal by an oscillator;
generating at least a clock signal based on at least information associated with the first control signal;
receiving at least the clock signal and a second control signal by a second signal generator;
generating at least a modulation signal based on at least information associated with the clock signal and the second control signal;
receiving at least the modulation signal by a gate driver;
outputting at least a drive signal to a switch to affect a first current flowing through a primary winding coupled to the secondary winding;
receiving at least a sensed signal and a threshold voltage by a third controller for regulating at least a peak current;
and
outputting the second control signal to the second signal generator;
wherein:
the sensed signal being associated with the first current flowing through the primary winding for the power converter;
the modulation signal corresponds to a switching frequency;
and
the first output signal corresponds to a demagnetization pulse width.

18 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/581,775Filed 19 Oct 2009 · us provisional application
Priority: 21 Oct 2008
Published: US 2010/0128501 A127 May 2010
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification2 codes

H02M 3/33523
With automatic control of the output voltage or current, e.g. flyback converters: with galvanic isolation between input and output of both the…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or