Method for controlling power factor correction circuit, controller and system

1. A method for controlling a power factor correction circuit that includes a rectification circuit and at least one switching circuit, wherein the at least one switching circuit adjusts a current in the power factor correction circuit, the method comprising:

detecting a stability degree of an input voltage of the power factor correction circuit, wherein the stability degree is at least one of a frequency or an amplitude deviation of the input voltage from a predetermined trend;

adjusting a current control parameter of a proportion, integral, differential (PID) or a proportion, integral (PI) according to the stability degree of the input voltage of the power factor correction circuit, wherein the control parameter of the PID or the PI includes one or more of a proportional coefficient, an integral coefficient, and a differential coefficient; and

controlling at least one of a voltage loop or a current loop using the adjusted control parameter of the PID or the PI to adjust a control signal of the at least one switching circuit, wherein the adjusted control parameter of the PID or the PI maintains the power factor correction circuit at a predetermined stability degree.

2. The method according to claim 1 , wherein the detecting of the stability degree of the input voltage of the power factor correction circuit comprises:

sampling the input voltage of the power factor correction circuit;

calculating a number of times of the input voltage deviating from the predetermined trend by a predetermined value within a predetermined duration; and

determining a stability degree of the input voltage of the power factor correction circuit according to the number of times of the input voltage deviating from the predetermined trend by the predetermined value within the predetermined duration.

3. The method according to claim 2 , wherein the adjusting of the current control parameter of the PID or the PI according to the stability degree of the input voltage of the power factor correction circuit comprises:

increasing the control parameter of the PID or the PI when the number of times of the input voltage deviating from the predetermined trend by the predetermined value is less than a second predetermined number threshold within the predetermined duration, wherein the second predetermined number threshold is less than a first predetermined number threshold.

4. The method according to claim 3 , further comprising:

when the current control parameter of the PID exceeds a predetermined control parameter threshold range of the PID, restricting the current control parameter of the current PID to the control parameter threshold range of the PID.

5. The method according to claim 2 , wherein sampling points for sampling the input voltage of the power factor correction circuit are set to a line that directly or indirectly reflects an alternating voltage change at an input end.

6. The method according to claim 2 , wherein the adjusting of the current control parameter of the PID or the PI according to the stability degree of the input voltage of the power factor correction circuit comprises:

decreasing the control parameter of the PID or the PI when the number of times of the input voltage deviating from the predetermined trend by the predetermined value is greater than a first predetermined number threshold within the predetermined duration.

7. The method according to claim 6 , wherein the adjusting of the current control parameter of the PID or the PI according to the stability degree of the input voltage of the power factor correction circuit comprises:

increasing the control parameter of the PID or the PI when the number of times of the input voltage deviating from the predetermined trend by the predetermined value is less than a second predetermined number threshold within the predetermined duration, wherein the second predetermined number threshold is less than the first predetermined number threshold.

8. The method according to claim 7 , further comprising:

when the current control parameter of the PID exceeds a predetermined control parameter threshold range of the PID, restricting the current control parameter of the current PID to the control parameter threshold range of the PID.

9. The method according to claim 1 , wherein the detecting of the stability degree of the input voltage of the power factor correction circuit is performed according to a predetermined frequency.

10. A controller for a power factor correction circuit, the controller comprising:

a stability detecting circuitry to detect a stability degree of an input voltage of the power factor correction circuit, wherein the stability degree is at least one of a frequency or an amplitude deviation of the input voltage from a predetermined trend;

a parameter adjusting circuit to adjust a current control parameter of a proportion, integral, differential (PID) or a proportion, integral (PI) according to the stability degree of the input voltage of the power factor correction circuit, wherein the control parameter of the PID or the PI includes one or more of a proportional coefficient, an integral coefficient, and a differential coefficient; and

a control circuit to control at least one of a voltage loop or a current loop using the adjusted control parameter of the PID or the PI to adjust a control signal of the at least one switching circuit, wherein the adjusted control parameter of the PID or the PI maintains the power factor correction circuit at a predetermined stability degree.

11. The controller according to claim 10 , wherein the control parameter of the PID includes at least one of a proportional gain parameter and an integral gain parameter.

12. The controller according to claim 10 , wherein the control parameter of the PID includes at least one of a proportional gain parameter, an integral gain parameter, and a differential gain parameter.

13. The controller according to claim 10 , further comprising:

a current loop; wherein

a control circuit controls the current loop to adjust the control signal of the at least one switching circuit in the power factor correction circuit by using the adjusted control parameter of the PID or the PI.

14. The controller according to claim 10 , further comprising:

a current loop and a voltage loop; wherein

a control circuit controls the current loop to adjust the control signal of the at least one switching circuit in the power factor correction circuit by using the adjusted control parameter of the PID or the PI.

15. A system for a power factor correction circuit, comprising:

the controller according to claim 10 ;

a power factor correction circuit;

a power supply; and

a load; wherein

the power factor correction circuit corrects a power factor of the power supply;

the power supply is coupled to an input end of the power factor correction circuit; and

the load is coupled to an output end of the power factor correction circuit.

16. The system according to claim 15 , wherein the control parameter of the PID includes at least one of a proportional gain parameter and an integral gain parameter.

17. The system according to claim 15 , wherein the control parameter of the PID includes at least one of a proportional gain parameter, an integral gain parameter, and a differential gain parameter.

18. The system according to claim 15 , further comprising:

a current loop; wherein

a control circuit controls the current loop to adjust the control signal of the at least one switching circuit in the power factor correction circuit by using the adjusted control parameter of the PID or the PI.

19. The system according to claim 15 , further comprising:

a current loop and a voltage loop; wherein

a control circuit controls the current loop to adjust the control signal of the at least one switching circuit in the power factor correction circuit by using the adjusted control parameter of the PID or the PI.