Apfc control circuit, method, and system

An active power factor correction (APFC)control method, applied to an APFC control circuit;

• wherein the APFC control circuit is configured to control turning-on and turning-off of a main switch tube of a boost module in an APFC converter circuit;
• the APFC converter circuit comprises a start-up current limiting module, a first filter module, a rectifier module, a second filter module, and the boost module connected in sequence;
• the start-up current limiting module is configured to access utility power and the boost module is connected to a load;
• wherein the APFC control circuit comprises a sampling correction module, a zero-pole compensation module, a first control module, a data processing module, and a second control module;
• the sampling correction module is connected to the utility power and the boost module for sampling and correcting a utility voltage of the utility power, and an inductor current and a bus voltage of the boost module, to obtain a utility correction voltage, an inductor correction current, and a bus correction voltage, respectively;
• the zero-pole compensation module is connected to the sampling correction module for zero-pole compensation of the sampled utility voltage, inductor current, and bus voltage to make phases of the utility correction voltage, the inductor correction current, and the bus correction voltage consistent with phases of an actual utility voltage, an actual inductor current, and an actual bus voltage, respectively;
• a first input of the first control module is connected to a target voltage, and a second input of the first control module is connected to the sampling correction module for comparing the bus correction voltage with the target voltage and outputting a voltage adjustment coefficient;
• a first input of the data processing module is connected to the first control module, and a second input of the data processing module is connected to the sampling correction module for obtaining a reference current according to the utility correction voltage and the voltage adjustment coefficient;
• a first input of the second control module is connected to the data processing module, and a second input of the second control module is connected to the sampling correction module for outputting a target control signal to the main switch tube according to the reference current and the inductor correction current;
• the method comprises:
• sampling and correcting the utility voltage of the utility power, and the inductor current and the bus voltage of the boost module, to obtain the utility correction voltage, the inductor correction current, and the bus correction voltage, respectively;
• performing zero-pole compensation on the sampled utility voltage, inductor current, and bus voltage to make the phases of the utility correction voltage, the inductor correction current, and the bus correction voltage consistent with the phases of the actual utility voltage, the actual inductor current, and the actual bus voltage, respectively;
• comparing the bus correction voltage with the target voltage and outputting the voltage adjustment coefficient;
• obtaining the reference current according to the utility correction voltage and the voltage adjustment coefficient;
• and
• outputting the target control signal to the main switch tube according to the reference current and the inductor correction current.

An active power factor correction (APFC) control system, comprising:

• an APFC converter circuit and an APFC control circuit;
• wherein the APFC control circuit is configured to control turning-on and turning-off of a main switch tube of a boost module in an APFC converter circuit;
• the APFC converter circuit comprises a start-up current limiting module, a first filter module, a rectifier module, a second filter module, and the boost module connected in sequence;
• the start-up current limiting module is configured to access utility power and the boost module is connected to a load;
• wherein the APFC control circuit comprises a sampling correction module, a zero-pole compensation module, a first control module, a data processing module, and a second control module;
• the sampling correction module is connected to the utility power and the boost module for sampling and correcting a utility voltage of the utility power, and an inductor current and a bus voltage of the boost module, to obtain a utility correction voltage, an inductor correction current, and a bus correction voltage, respectively;
• the zero-pole compensation module is connected to the sampling correction module for zero-pole compensation of the sampled utility voltage, inductor current, and bus voltage to make phases of the utility correction voltage, the inductor correction current, and the bus correction voltage consistent with phases of an actual utility voltage, an actual inductor current, and an actual bus voltage, respectively;
• a first input of the first control module is connected to a target voltage, and a second input of the first control module is connected to the sampling correction module for comparing the bus correction voltage with the target voltage and outputting a voltage adjustment coefficient;
• a first input of the data processing module is connected to the first control module, and a second input of the data processing module is connected to the sampling correction module for obtaining a reference current according to the utility correction voltage and the voltage adjustment coefficient;
• a first input of the second control module is connected to the data processing module, and a second input of the second control module is connected to the sampling correction module for outputting a target control signal to the main switch tube according to the reference current and the inductor correction current.