CN112671223A - Boost-PFC control circuit and control method thereof - Google Patents
Boost-PFC control circuit and control method thereof Download PDFInfo
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Abstract
The invention discloses a Boost-PFC control circuit and a control method thereof, wherein the Boost-PFC control circuit comprises a PFC main circuit, a sampling module, a double current loop control module and a PWM module, wherein the sampling module outputs sampled input voltage, input current, output voltage and first branch current to the double current loop control module; the double-current loop control module outputs a first control signal and a second control signal which are obtained by calculation according to the sampled input voltage, output voltage, input current and first branch current to the PWM module; the PWM module outputs a first driving signal to the first PFC branch according to the first control signal and outputs a second driving signal to the second PFC branch according to the second control signal; the invention can effectively solve the problem of current imbalance among the parallel branches, thereby improving the reliability of the whole circuit.
Description
Technical Field
The invention relates to the technical field of power circuits, in particular to a Boost-PFC control circuit and a control method thereof.
Background
The Power Factor Correction of the existing air conditioner Power supply adopts multi-sampling single-phase Boost-PFC (Power Factor Correction) control, adopts dual-loop control of a voltage loop and a current loop, and also adopts a staggered parallel Boost-PFC scheme. However, the existing control circuit only samples the total input current and the output voltage for control, and has no way to control the current of each branch in the interleaved parallel Boost-PFC circuit, so that the problem of unbalanced current of the two parallel branches can occur; under the condition of unbalanced current, some branches can work under the condition of large current for a long time, some branches can work under the condition of small current for a long time, and the branches working under the condition of large current for a long time can bear enough large current stress, so that the service life of an electronic device in the branches is shortened, and the reliability of the whole system is reduced.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
The invention aims to provide a Boost-PFC control circuit and a control method thereof, which can effectively solve the problem of current imbalance among parallel branches and further improve the reliability of the whole circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a Boost-PFC control circuit comprises a PFC main circuit, a sampling module, a double-current-loop control module and a PWM module, wherein the PFC main circuit comprises a first PFC branch and a second PFC branch which are connected in parallel, the sampling module is respectively connected with the double-current-loop control module, the first PFC branch and the input end and the output end of the main PFC circuit, the double-current-loop control module is connected with the PWM module, and the PWM module is respectively connected with the first PFC branch and the second PFC branch, wherein:
the sampling module is used for sampling the input voltage, the input current and the output voltage of the PFC main circuit and the first branch current of the first PFC branch and outputting the sampled input voltage, input current, output voltage and first branch current to the dual-current-loop control module;
the double-current-loop control module is used for calculating a reference current according to the sampled input voltage and the sampled output voltage, calculating a second branch current according to the sampled input current and the sampled first branch current, and outputting a first control signal obtained by calculation according to the reference current and the first branch current and a second control signal obtained by calculation according to the reference current and the second branch current to the PWM module;
the PWM module is used for outputting a first driving signal to the first PFC branch according to the first control signal and outputting a second driving signal to the second PFC branch according to the second control signal.
The Boost-PFC control circuit also comprises a feedforward module; the feedforward module is respectively connected with the sampling module and the double-current-loop control module; the feedforward module is used for outputting feedforward voltage and feedforward duty ratio obtained according to the sampled input voltage to the double-current-loop control module.
In the Boost-PFC control circuit, the dual current loop control module includes a voltage loop controller, a multiplier, a first current loop controller, a second current loop controller, a subtractor, a first adder, and a second adder, the voltage loop controller is respectively connected to the sampling module and the multiplier, the multiplier is respectively connected to the first current loop controller and the second current loop controller, the first current loop controller is connected to the PWM module through the first adder, the second current loop controller is connected to the PWM module through the second adder, wherein:
the voltage ring controller is used for outputting a difference voltage to the multiplier after the difference is made between the reference voltage and the sampled output voltage;
the multiplier is used for multiplying the sampled input voltage, the difference voltage and the feedforward voltage and outputting the reference current to the first current loop controller and the second current loop controller;
the first current loop controller is used for outputting a first branch current to the first adder according to the reference current and the sampled first branch current;
the subtracter is used for subtracting the sampled input current and the sampled first branch current and then outputting the second branch current to the second current loop controller;
the second current loop controller is used for outputting a second branch current to the second adder according to the reference current and the second branch current;
the first adder is used for outputting the first control signal to the PWM module according to the first branch current and the feedforward duty ratio;
the second adder is used for outputting the second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
In the Boost-PFC control circuit, the feedforward module comprises a voltage feedforward loop controller and a duty ratio feedforward loop controller, the voltage feedforward loop controller is respectively connected with the sampling module and the multiplier, and the duty ratio feedforward loop controller is respectively connected with the sampling module, the first adder and the second adder; wherein:
the voltage feedforward loop controller is used for outputting the feedforward voltage to the multiplier according to the sampled input voltage;
the duty cycle feedforward loop controller is configured to output a feedforward duty cycle to the first adder and the second adder based on the sampled input voltage and the reference voltage.
In the Boost-PFC control circuit, the PWM module comprises a first converter, a second converter, a first driving unit and a second driving unit, the first converter is respectively connected with the first adder and the first driving unit, and the second converter is respectively connected with the second adder and the second driving unit; wherein:
the first converter is used for performing voltage reduction processing on the first control signal and outputting the first control signal to the first driving unit;
the first driving unit is used for outputting a first driving signal to the first PFC branch according to the first control signal;
the second converter is used for performing voltage reduction processing on the second control signal and outputting the second control signal to the second driving unit;
the second driving unit is configured to output a second driving signal to the second PFC branch according to the second control signal, where a phase difference between the first driving signal and the second driving signal is a preset phase angle.
In the Boost-PFC control circuit, the first PFC branch comprises a first power switching tube, a first Boost inductor, a first rectifier diode and a resistor; the grid electrode of the first power switch tube is connected with the first driving unit, the source electrode of the first power switch tube is connected with one end of the resistor and the sampling module, the other end of the resistor is grounded, the drain electrode of the first power switch tube is connected with one end of the first boosting inductor and the anode of the first rectifier diode, and the other end of the first boosting inductor is connected with the power input end.
A control method based on the Boost-PFC control circuit comprises the following steps:
the sampling module samples input voltage, input current and output voltage of the PFC main circuit and first branch current of a first PFC branch, and outputs the sampled input voltage, input current, output voltage and first branch current to the control module;
the double-current-loop control module obtains a reference current according to the sampled input voltage and the sampled output voltage, obtains a second branch current according to the sampled input current and the sampled first branch current, and outputs a first control signal obtained according to the reference current and the first branch current and a second control signal obtained according to the reference current and the second branch current to the PWM module;
the PWM module outputs a first driving signal to the first PFC branch according to the first control signal, and outputs a second driving signal to the second PFC branch according to the second control signal.
In the control method, after the step of outputting the sampled input voltage, input current, output voltage and first branch current to the dual-current-loop control module by the sampling module, the method further comprises:
the feedforward module outputs feedforward voltage and feedforward duty ratio obtained according to the sampled input voltage to the double-current-loop control module.
In the control method, the steps of obtaining a reference current by the double current loop control module according to the sampled input voltage and the sampled output voltage, obtaining a second branch current according to the sampled input current and the sampled first branch current, and outputting a first control signal obtained according to the reference current and the first branch current and a second control signal obtained according to the reference current and the second branch current to the PWM module include:
the voltage ring controller outputs a difference voltage to a multiplier after the difference is made between the reference voltage and the sampled output voltage;
the multiplier multiplies the sampled input voltage, the difference voltage and the feedforward voltage and outputs a reference current to the first current loop controller and the second current loop controller, and the subtracter subtracts the sampled input current and the sampled first branch current and outputs a second branch current to the second current loop controller;
the first current loop controller outputs a first branch current to the first adder according to the reference current and the sampled first branch current, and the second current loop controller outputs a second branch current to the second adder according to the reference current and the second branch current;
a first adder outputs the first control signal to the PWM module according to the first branch current and the feed-forward duty cycle; and the second adder outputs the second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
In the control method, the step of outputting the feedforward voltage and the feedforward duty ratio obtained according to the sampled input voltage to the dual-current-loop control module by the feedforward module includes:
the voltage feedforward loop controller outputs feedforward voltage to a multiplier according to the sampled input voltage;
the duty cycle feedforward loop controller outputs a feedforward duty cycle to the first adder and the second adder according to the sampled input voltage and the reference voltage.
Compared with the prior art, the invention provides a Boost-PFC control circuit and a control method thereof, wherein the Boost-PFC control circuit comprises a PFC main circuit, a sampling module, a double current loop control module and a PWM module, wherein the sampling module is used for sampling the input voltage, the input current and the output voltage of the PFC main circuit and the first branch current of the first PFC branch circuit and outputting the sampled input voltage, the input current, the output voltage and the first branch current to the double current loop control module; the double-current-loop control module is used for calculating a reference current according to the sampled input voltage and the sampled output voltage, calculating a second branch current according to the sampled input current and the sampled first branch current, and outputting a first control signal obtained by calculation according to the reference current and the first branch current and a second control signal obtained by calculation according to the reference current and the second branch current to the PWM module; the PWM module is used for outputting a first driving signal to the first PFC branch according to the first control signal and outputting a second driving signal to the second PFC branch according to the second control signal; according to the invention, the double current loop control modules are arranged to respectively control the currents of the two branches, so that the problem of current imbalance between the parallel branches can be effectively solved, and the reliability of the whole circuit is further improved.
Drawings
Fig. 1 is a block diagram of a Boost-PFC control circuit according to the present invention;
fig. 2 is a schematic diagram of a sampling module, a dual current loop control module, a feed-forward module and a PWM module in the Boost-PFC control circuit provided by the present invention;
fig. 3 is a schematic diagram of a main PFC circuit in the Boost-PFC control circuit according to the present invention;
fig. 4 is a flowchart of a control method of the Boost-PFC control circuit according to the present invention;
fig. 5 is a flowchart of step S200 in the control method of the Boost-PFC control circuit according to the present invention;
fig. 6 is a flowchart of step S10 in the control method of the Boost-PFC control circuit according to the present invention.
Detailed Description
The invention aims to provide a Boost-PFC control circuit and a control method thereof, which can effectively solve the problem of current imbalance among parallel branches and further improve the reliability of the whole circuit.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 2, the present invention provides a Boost-PFC control circuit. The Boost-PFC (Power Factor Correction) circuit comprises a PFC main circuit 10, a sampling module 20, a double-current-loop control module 30 and a PWM (Pulse Width Modulation) module 40, wherein the PFC main circuit 10 comprises a first PFC branch 11 and a second PFC branch 12 which are connected in parallel, the sampling module 20 is respectively connected with the double-current-loop control module 30, the first PFC branch 11 and the input end and the output end of the main PFC circuit, the double-current-loop control module 30 is connected with the PWM module 40, and the PWM module 40 is respectively connected with the first PFC branch 11 and the second PFC branch 12.
The sampling module 20 is configured to sample an input voltage (Vrect in this embodiment), an input current (Irect in this embodiment), an output voltage (VOUT in this embodiment) of the main PFC circuit 10 and a first branch current (Ig 1 in this embodiment) of the first PFC branch 11, and output the sampled input voltage, the sampled input current, the sampled output voltage (Vreal in this embodiment) and the first branch current (I1 in this embodiment) to the dual current loop control module 30; the dual current loop control module 30 is configured to calculate a reference current (Iref in this embodiment) according to the sampled input voltage and the sampled output voltage, calculate a second branch current (I2 in this embodiment) according to the sampled input current and the sampled first branch current, and output a first control signal calculated according to the reference current and the first branch current and a second control signal calculated according to the reference current and the second branch current to the PWM module 40; the PWM module 40 is configured to output a first driving signal (Vgs 1 in this embodiment) to the first PFC branch 11 according to the first control signal, and output a second driving signal (Vgs 2 in this embodiment) to the second PFC branch 12 according to the second control signal, so as to achieve effective control of the two parallel branches.
In the invention, the sampling module 20 performs filtering and per-unit processing on the input voltage, the input current, the output voltage of the PFC main circuit 10 and the first branch current of the first PFC branch 11 to ensure the stability and reliability of the acquired input voltage, input current, output voltage and first branch current, and the per-unit processing is for unifying dimensions and preventing data overflow during calculation of the post-stage dual-current-loop control module 30; meanwhile, the dual current loop control module 30 is arranged to control the current according to the input current sampled by the sampling module 20, that is, the input total current and the first branch current, so that the second branch current in the second PFC branch 12 can be obtained, and the currents of the two branches can be effectively controlled by obtaining the currents of the two branches, so that the currents in the two parallel branches are balanced, and the reliability of the whole circuit is improved.
Further, the Boost-PFC control circuit further includes a feed-forward module 50, and the feed-forward module 50 is respectively connected to the sampling module 20 and the dual current loop control module 30; the feedforward module 50 is configured to output a feedforward voltage (Vfor in this embodiment) and a feedforward duty ratio (Dfor in this embodiment) calculated according to the sampled input voltage to the dual-current-loop control module 30; the invention directly feeds back the front-end input voltage to the double-current loop control module 30 by arranging the feedforward module 50, so as to widen the working range of the input voltage and ensure the constant input power; the feedforward module 50 directly feeds back the duty ratio signal of the front-end input voltage to the double-current loop control module 30, so that the dynamic response speed of the whole circuit can be effectively improved, the crossover distortion of the Boost-PFC control circuit is reduced, and the power factor is improved.
Further, the dual current loop control module 30 includes a voltage loop controller 31, a multiplier 32, a first current loop controller 33, a second current loop controller 34, a subtractor 35, a first adder 36 and a second adder 37, the voltage loop controller 31 is respectively connected to the sampling module 20 and the multiplier 32, the multiplier 32 is respectively connected to the first current loop controller 33 and the second current loop controller 34, the first current loop controller 33 is connected to the PWM module 40 through the first adder 36, and the second current loop controller 34 is connected to the PWM module 40 through the second adder 37.
The voltage loop controller 31 is configured to output a difference voltage to the multiplier 32 after a difference is made between a reference voltage (Vout in this embodiment) and the sampled output voltage; the multiplier 32 is configured to multiply the sampled input voltage, the difference voltage, and the feedforward voltage to output a reference current to the first current loop controller 33 and the second current loop controller 34; the first current loop controller 33 is configured to output the first branch current to the first adder 36 according to the reference current and the sampled first branch current; the subtractor 35 is configured to output a second branch current to the second current loop controller 34 after subtracting the sampled input current from the sampled first branch current; the second current loop controller 34 is configured to output the second branch current to the second adder 37 according to the reference current and the second branch current; the first adder 36 is configured to output a first control signal to the PWM module 40 according to the first branch current and the feed-forward duty cycle; the second adder 37 is configured to output a second control signal to the PWM module 40 according to the second branch current and the feed-forward duty ratio, so as to subsequently implement effective control on the first PFC branch 11 and the second PFC branch 12.
In this embodiment, the subtractor 35 is arranged to obtain a second branch current according to the sampled input current and the sampled first branch current, the two main branch currents are respectively input to the first current loop controller 33 and the second current loop controller 34, and after the first branch current and the second branch current are respectively compared with the reference current by the two current loop controllers, the first control signal and the second control signal are respectively output to the PWM module 40, so that each branch current is forced to be equal to the provided reference current in real time in each switching period, thereby achieving a real-time current sharing effect of the two branch currents, and avoiding a situation that one branch of the two branches works in a large current state and the other branch works in a small current state, so as to improve the reliability of the whole circuit.
Further, the feedforward module 50 includes a voltage feedforward loop controller 51 and a duty ratio feedforward loop controller 52, the voltage feedforward loop controller 51 is connected to the sampling module 20 and the multiplier 32, respectively, and the duty ratio feedforward loop controller 52 is connected to the sampling module 20, the first adder 36 and the second adder 37, respectively.
The voltage feedforward loop controller 51 is configured to output a feedforward voltage to the multiplier 32 according to the sampled input voltage; the duty cycle feedforward loop controller 52 is configured to output a feedforward duty cycle to the first adder 36 and the second adder 37 according to the sampled input voltage and the reference voltage; in the embodiment, the working range of the input voltage can be widened by introducing the voltage feedforward loop controller 51, so that the input power is ensured to be constant; the duty ratio feedforward loop controller 52 directly feeds back the duty ratio signal of the front-end input voltage to the first adder 36 and the second adder 37, and compensates the input voltage for the output of the first current loop controller and the second current loop controller 34, so that the input current error can be reduced; moreover, by providing the duty ratio feedforward loop controller 52, when the input voltage of the PFC main circuit 10 changes, the duty ratio output can be rapidly adjusted directly by the duty ratio feedforward loop controller 52 without waiting for the output result of the current loop controller, thereby improving the dynamic response capability of the whole circuit to the input voltage.
Further, the PWM module 40 includes a first converter 41, a second converter 42, a first driving unit 43 and a second driving unit 44, the first converter 41 is connected to the first adder 36 and the first driving unit 43, respectively, and the second converter 42 is connected to the second adder 37 and the second driving unit 44, respectively.
The first converter 41 is configured to perform voltage reduction processing on the first control signal and output the first control signal to the first driving unit 43; the first driving unit 43 is configured to output a first driving signal to the first PFC branch 11 according to the first control signal; the second converter 42 is configured to perform voltage reduction processing on the second control signal and output the second control signal to the second driving unit 44; the second driving unit 44 is configured to output a second driving signal to the second PFC branch 12 according to the second control signal, where the phase difference between the first driving signal and the second driving signal is a preset phase angle, and the preset phase angle is 180 ° in this embodiment.
In this embodiment, the first converter 41 and the second converter 42 respectively step down the first control signal and the second control signal and output the signals to the first driving unit 43 and the second driving unit 44, the first driving unit 43 compares the stepped down first control signal with the carrier to output the first driving signal to the first PFC branch 11, the second driving unit 44 compares the stepped down second control signal with the carrier to output the second driving signal to the second PFC branch 12, and the phase difference between the two driving signals is a preset phase angle, wherein the frequency of the carrier is 20KHz, the staggered conduction frequency of the corresponding output two driving signals is 40KHz, and the two driving signals are staggered by 180 °.
Further, referring to fig. 3, the first PFC branch 11 includes a first power switch Q1, a first boost inductor L1, a first rectifier diode D1, and a resistor R1, and the second PFC branch 12 includes a second power switch Q2, a second boost inductor L2, and a second rectifier diode D2; the grid electrode of the first power switch tube Q1 is connected with the first driving unit 43, the source electrode of the first power switch tube Q1 is connected with one end of a resistor R1 and the sampling module 20, the other end of the resistor R1 is grounded, the drain electrode of the first power switch tube Q1 is connected with one end of a first boosting inductor L1 and the anode of a first rectifier diode D1, the other end of the first boosting inductor L1 is connected with a power supply input end, and the cathode of a second rectifier diode D2 is connected with one end of an energy storage capacitor C1, a load and the sampling module 20; the gate of the second power switch Q2 is connected to the second driving unit 44, the source of the first power switch Q1 is grounded, the drain of the second power switch Q2 is connected to one end of the second boost inductor L2 and the anode of the second rectifier diode D2, the other end of the second boost inductor L2 is connected to the power input end, and the cathode of the second rectifier diode D2 is connected to one end of the energy storage capacitor C1, the load and the sampling module 20; in this embodiment, two driving signals respectively drive the first power switch Q1 and the second power switch Q2 to be turned on or off, so as to control the repeated charging and discharging of the first boost inductor L1 and the second boost inductor L2, thereby realizing the voltage boosting.
Based on the Boost-PFC control circuit, the present invention further provides a control method of the Boost-PFC control circuit, referring to fig. 4, the control method of the Boost-PFC control circuit includes the following steps:
s100, a sampling module samples input voltage, input current and output voltage of a PFC main circuit and first branch current of a first PFC branch, and outputs the sampled input voltage, input current, output voltage and first branch current to a control module;
s200, the double-current-loop control module calculates a reference current according to the sampled input voltage and the sampled output voltage, calculates a second branch current according to the sampled input current and the sampled first branch current, and outputs a first control signal obtained by calculation according to the reference current and the first branch current and a second control signal obtained by calculation according to the reference current and the second branch current to the PWM module;
s300, the PWM module outputs a first driving signal to the first PFC branch according to the first control signal, and outputs a second driving signal to the second PFC branch according to the second control signal.
Further, step S100 is followed by:
and S10, the feedforward module outputs the feedforward voltage and the feedforward duty ratio which are obtained by calculation according to the sampled input voltage to the double-current-loop control module.
Further, referring to fig. 5, step S200 specifically includes:
s210, the voltage loop controller outputs a difference voltage to a multiplier after the difference is made between the reference voltage and the sampled output voltage;
s220, multiplying the sampled input voltage, the difference voltage and the feedforward voltage by a multiplier, outputting a reference current to a first current loop controller and a second current loop controller, and subtracting the sampled input current and the sampled first branch current by a subtracter, and outputting a second branch current to the second current loop controller;
s230, the first current loop controller outputs first branch current to the first adder according to the reference current and the sampled first branch current, and the second current loop controller outputs second branch current to the second adder according to the reference current and the second branch current;
s240, the first adder outputs a first control signal to the PWM module according to the first branch current and the feedforward duty ratio; and the second adder outputs a second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
Further, referring to fig. 6, step S10 specifically includes:
s11, the voltage feedforward loop controller outputs feedforward voltage to a multiplier according to the sampled input voltage;
and S12, the duty ratio feedforward loop controller outputs the feedforward duty ratio to the first adder and the second adder according to the sampled input voltage and the reference voltage.
In summary, the present invention provides a Boost-PFC control circuit and a control method thereof, wherein the Boost-PFC control circuit includes a PFC main circuit, a sampling module, a dual current loop control module and a PWM module, the sampling module is configured to sample an input voltage, an input current, and an output voltage of the PFC main circuit and a first branch current of a first PFC branch, and output the sampled input voltage, input current, output voltage, and first branch current to the dual current loop control module; the double-current-loop control module is used for calculating a reference current according to the sampled input voltage and the sampled output voltage, calculating a second branch current according to the sampled input current and the sampled first branch current, and outputting a first control signal obtained by calculation according to the reference current and the first branch current and a second control signal obtained by calculation according to the reference current and the second branch current to the PWM module; the PWM module is used for outputting a first driving signal to the first PFC branch according to the first control signal and outputting a second driving signal to the second PFC branch according to the second control signal; according to the invention, the double current loop control modules are arranged to respectively control the currents of the two branches, so that the problem of current imbalance between the parallel branches can be effectively solved, and the reliability of the whole circuit is further improved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A Boost-PFC control circuit is characterized by comprising a PFC main circuit, a sampling module, a double-current-loop control module and a PWM module, wherein the PFC main circuit comprises a first PFC branch and a second PFC branch which are connected in parallel, the sampling module is respectively connected with the double-current-loop control module, the first PFC branch and the input end and the output end of the PFC main circuit, the double-current-loop control module is connected with the PWM module, and the PWM module is respectively connected with the first PFC branch and the second PFC branch, wherein:
the sampling module is used for sampling the input voltage, the input current and the output voltage of the PFC main circuit and the first branch current of the first PFC branch and outputting the sampled input voltage, input current, output voltage and first branch current to the dual-current-loop control module;
the double-current-loop control module is used for obtaining a reference current according to the sampled input voltage and the sampled output voltage, obtaining a second branch current according to the sampled input current and the sampled first branch current, and outputting a first control signal obtained according to the reference current and the first branch current and a second control signal obtained according to the reference current and the second branch current to the PWM module;
the PWM module is used for outputting a first driving signal to the first PFC branch according to the first control signal and outputting a second driving signal to the second PFC branch according to the second control signal.
2. The Boost-PFC control circuit of claim 1, further comprising a feed-forward module; the feedforward module is respectively connected with the sampling module and the double-current-loop control module; the feedforward module is used for outputting feedforward voltage and feedforward duty ratio obtained according to the sampled input voltage to the double-current-loop control module.
3. The Boost-PFC control circuit of claim 2, wherein the dual current loop control module comprises a voltage loop controller, a multiplier, a first current loop controller, a second current loop controller, a subtractor, a first adder and a second adder, the voltage loop controller is respectively connected with the sampling module and the multiplier, the multiplier is respectively connected with the first current loop controller and the second current loop controller, the first current loop controller is connected with the PWM module through the first adder, the second current loop controller is connected with the PWM module through the second adder, wherein:
the voltage ring controller is used for outputting a difference voltage to the multiplier after the difference is made between the reference voltage and the sampled output voltage;
the multiplier is used for multiplying the sampled input voltage, the difference voltage and the feedforward voltage and outputting the reference current to the first current loop controller and the second current loop controller;
the first current loop controller is used for outputting a first branch current to the first adder according to the reference current and the sampled first branch current;
the subtracter is used for subtracting the sampled input current and the sampled first branch current and then outputting the second branch current to the second current loop controller;
the second current loop controller is used for outputting a second branch current to the second adder according to the reference current and the second branch current;
the first adder is used for outputting the first control signal to the PWM module according to the first branch current and the feedforward duty ratio;
the second adder is used for outputting the second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
4. The Boost-PFC control circuit of claim 3, wherein the feed-forward module comprises a voltage feed-forward loop controller and a duty cycle feed-forward loop controller, the voltage feed-forward loop controller is connected with the sampling module and the multiplier, respectively, and the duty cycle feed-forward loop controller is connected with the sampling module, the first adder, and the second adder, respectively; wherein:
the voltage feedforward loop controller is used for outputting the feedforward voltage to the multiplier according to the sampled input voltage;
the duty cycle feedforward loop controller is configured to output a feedforward duty cycle to the first adder and the second adder based on the sampled input voltage and the reference voltage.
5. The Boost-PFC control circuit of claim 4, wherein the PWM module comprises a first converter, a second converter, a first driving unit and a second driving unit, the first converter is connected to the first adder and the first driving unit, respectively, and the second converter is connected to the second adder and the second driving unit, respectively; wherein:
the first converter is used for performing voltage reduction processing on the first control signal and outputting the first control signal to the first driving unit;
the first driving unit is used for outputting a first driving signal to the first PFC branch according to the first control signal;
the second converter is used for performing voltage reduction processing on the second control signal and outputting the second control signal to the second driving unit;
the second driving unit is configured to output a second driving signal to the second PFC branch according to the second control signal, where a phase difference between the first driving signal and the second driving signal is a preset phase angle.
6. The interleaved parallel Boost-PFC control circuit of claim 5, wherein the first PFC branch comprises a first power switching tube, a first Boost inductor, a first rectifying diode, and a resistor; the grid electrode of the first power switch tube is connected with the first driving unit, the source electrode of the first power switch tube is connected with one end of the resistor and the sampling module, the other end of the resistor is grounded, the drain electrode of the first power switch tube is connected with one end of the first boosting inductor and the anode of the first rectifier diode, and the other end of the first boosting inductor is connected with the power input end.
7. A control method based on the Boost-PFC control circuit of any one of claims 1-6, characterized by comprising the following steps:
the sampling module samples input voltage, input current and output voltage of the PFC main circuit and first branch current of a first PFC branch, and outputs the sampled input voltage, input current, output voltage and first branch current to the control module;
the double-current-loop control module obtains a reference current according to the sampled input voltage and the sampled output voltage, obtains a second branch current according to the sampled input current and the sampled first branch current, and outputs a first control signal obtained according to the reference current and the first branch current and a second control signal obtained according to the reference current and the second branch current to the PWM module;
the PWM module outputs a first driving signal to the first PFC branch according to the first control signal, and outputs a second driving signal to the second PFC branch according to the second control signal.
8. The control method of claim 7, wherein the step of the sampling module outputting the sampled input voltage, input current, output voltage and first branch current to the dual current loop control module is further followed by the step of:
the feedforward module outputs feedforward voltage and feedforward duty ratio obtained according to the sampled input voltage to the double-current-loop control module.
9. The control method according to claim 8, wherein the step of outputting a first control signal obtained from the reference current and the first branch current and a second control signal obtained from the reference current and the second branch current to the PWM module after obtaining the reference current from the sampled input voltage and the sampled output voltage and obtaining the second branch current from the sampled input current and the sampled first branch current comprises:
the voltage ring controller outputs a difference voltage to a multiplier after the difference is made between the reference voltage and the sampled output voltage;
the multiplier multiplies the sampled input voltage, the difference voltage and the feedforward voltage and outputs a reference current to the first branch current loop controller and the second current loop controller, and the subtracter subtracts the sampled input current and the sampled first branch current and outputs a second branch current to the second current loop controller;
the first current loop controller outputs a first branch current to the first adder according to the reference current and the sampled first branch current, and the second current loop controller outputs a second branch current to the second adder according to the reference current and the second branch current;
a first adder outputs the first control signal to the PWM module according to the first branch current and the feed-forward duty cycle; and the second adder outputs the second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
10. The control method of claim 9, wherein the step of the feedforward module outputting a feedforward voltage and a feedforward duty cycle derived from the sampled input voltage to the dual current loop control module comprises: the voltage feedforward loop controller outputs feedforward voltage to a multiplier according to the sampled input voltage; the duty cycle feedforward loop controller outputs a feedforward duty cycle to the first adder and the second adder according to the sampled input voltage and the reference voltage.
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| CN114244117A (en) * | 2021-12-23 | 2022-03-25 | 河北科技大学 | Control method and control device of low-ripple switching power supply |
| CN117353564A (en) * | 2023-12-04 | 2024-01-05 | 珠海格力电器股份有限公司 | Current sharing control circuit, current sharing control method, control equipment and storage medium |
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| CN104883060A (en) * | 2015-05-26 | 2015-09-02 | 华南理工大学 | Dual independent current-loop digital control method facing interleaving parallel PFC |
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| US20130076317A1 (en) * | 2011-09-22 | 2013-03-28 | Chia-An YEH | Power factor control circuit and power factor control method |
| CN104883060A (en) * | 2015-05-26 | 2015-09-02 | 华南理工大学 | Dual independent current-loop digital control method facing interleaving parallel PFC |
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| CN114244117A (en) * | 2021-12-23 | 2022-03-25 | 河北科技大学 | Control method and control device of low-ripple switching power supply |
| CN117353564A (en) * | 2023-12-04 | 2024-01-05 | 珠海格力电器股份有限公司 | Current sharing control circuit, current sharing control method, control equipment and storage medium |
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