Granted Patent B2

US 9,077,258 · App. 13/551,705 · Granted Jul 7, 2015

Abstract

Claims (36)

1. A regulation circuit of a power converter, comprising:

a signal generator generating a compensation signal in accordance with a synchronous rectifying signal; and

an error amplifier having a reference signal for generating a feedback signal in accordance with an output voltage of the power converter;

wherein the compensation signal is coupled to program the reference signal; the feedback signal is coupled to generate a switching signal for regulating an output of the power converter.

2. The regulation circuit as claimed in claim 1 , further comprising:

a resistor coupled to the signal generator for programming the level of the compensation signal in accordance with the synchronous rectifying signal.

3. The regulation circuit as claimed in claim 1 , further comprising:

a filter coupled to the reference signal for filtering the reference signal.

4. The regulation circuit as claimed in claim 3 , wherein the filter comprises:

a capacitor for filtering the reference signal.

5. The regulation circuit as claimed in claim 1 , wherein the synchronous rectifying signal is utilized to control a power transistor coupled to the power converter; wherein the power transistor is used for a synchronous rectifier.

6. The regulation circuit as claimed in claim 1 , wherein the synchronous rectifying signal is correlated to an output current of the power converter.

7. The regulation circuit as claimed in claim 1 , further comprising:

A buffer amplifier having a reference voltage and coupled to the compensation signal for generating the reference signal.

8. The regulation circuit as claimed in claim 1 , wherein the signal generator comprises:

a capacitor providing a voltage for generating the compensation signal; and

a charge circuit charging the capacitor in response to the synchronous rectifying signal for providing the voltage;

wherein the voltage is correlated to the synchronous rectifying signal.

9. The regulation circuit as claimed in claim 8 , wherein the signal generator further comprises:

a voltage to current converter converting the voltage to a current for generating the compensation signal; and

a resistor coupled to the voltage to current converter to program the current in accordance with the synchronous rectifying signal for programming the level of the compensation signal.

10. A method for a regulation circuit of a power converter, comprising:

receiving a synchronous rectifying signal for generating a compensation signal;

compensating a reference signal of an error amplifier of the regulation circuit in accordance with the compensation signal; and

generating a feedback signal in accordance with the reference signal and an output voltage of the power converter;

wherein the feedback signal is coupled to generate a switching signal for regulating an output of the power converter.

11. The method as claimed in claim 10 , further comprising:

programming the level of the compensation signal in accordance with the synchronous rectifying signal.

12. The method as claimed in claim 10 , wherein the synchronous rectifying signal is utilized to control a power transistor coupled to the power converter; wherein the power transistor is used for a synchronous rectifier.

13. The method as claimed in claim 10 , wherein the synchronous rectifying signal is correlated to an output current of the power converter.

14. The method as claimed in claim 10 , further comprising:

charging a capacitor in response to the synchronous rectifying signal to provide a voltage for generating the compensation signal;

wherein the voltage is correlated to the synchronous rectifying signal.

15. The method as claimed in claim 14 , further comprising:

converting the voltage to a current for generating the compensation signal; and

programming the current in accordance with the synchronous rectifying signal for programming the level of the compensation signal.

Assignments (10)