CN112671223B - 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, the sampled output voltage, the sampled input current and the sampled 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 unbalanced current between parallel branches, thereby improving the reliability of the whole circuit.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a Boost-PFC control circuit and a control method thereof.
Background
The existing air conditioner power supply power factor correction multi-sampling single-phase Boost-PFC (Power Factor Correction, power factor positive) control adopts voltage ring and current ring double-loop control, and also has an interleaved parallel Boost-PFC scheme. However, the existing control circuit only samples the total input current and the output voltage to control, and no method is available for controlling the current of each branch in the staggered parallel Boost-PFC circuit, so that the problem of current imbalance occurs in two parallel branches; under the condition of unbalanced current, some branches can work under the condition of heavy current for a long time, some branches can work under the condition of light current for a long time, and the branches which work under the condition of heavy current for a long time can bear enough large current stress, so that the service life of electronic devices in the branches is reduced, and the reliability of the whole system is reduced.
There is thus a need for improvements and improvements in the art.
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 unbalanced current between parallel branches, thereby improving the reliability of the whole circuit.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the Boost-PFC control circuit comprises a PFC main circuit, a sampling module, a dual-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 dual-current loop control module, the first PFC branch and the input end and the output end of the main PFC circuit, the dual-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, the output voltage and the first branch current of the first PFC branch of the PFC main circuit, and outputting the sampled input voltage, input current, output voltage and first branch current to the dual-current loop control module;
the dual-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 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;
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 comprises a voltage loop controller, a multiplier, a first current loop controller, a second current loop controller, a subtracter, a first adder and a second adder, wherein 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, and the second current loop controller is connected with the PWM module through the second adder, wherein:
the voltage loop controller is used for outputting a difference voltage to the multiplier after the reference voltage and the sampled output voltage are subjected to difference;
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 differencing the sampled input current and the sampled first branch current and 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 configured to output the first control signal to the PWM module according to the first branch current and the feedforward duty cycle;
the second adder is configured to output the second control signal to the PWM module according to the second branch current and the feedforward duty cycle.
In the Boost-PFC control circuit, the feedforward module comprises a voltage feedforward loop controller and a duty cycle feedforward loop controller, wherein the voltage feedforward loop controller is respectively connected with the sampling module and the multiplier, and the duty cycle 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, wherein 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 carrying out step-down 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 step-down processing on the second control signal and outputting the second control signal to the second driving unit;
the second driving unit is used for outputting a second driving signal to the second PFC branch according to the second control signal, and the phase difference between the first driving signal and the second driving signal is preset phase angle.
In the Boost-PFC control circuit, the first PFC branch comprises a first power switch 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 boost inductor and the anode of the first rectifying diode, and the other end of the first boost 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 the input voltage, the input current, the output voltage and the first branch current of the first PFC branch of the PFC main circuit, 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, 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 after obtaining a second branch current according to the sampled input current and the sampled first branch current;
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, the sampling module further includes:
and 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 step of the dual-current loop control module 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 comprises:
the voltage ring controller is used for outputting a difference voltage to the multiplier after making a difference between the reference voltage and the sampled output voltage;
the multiplier multiplies the sampled input voltage, the difference voltage and the feedforward voltage to output reference current to the first current loop controller and the second current loop controller, and the subtracter subtracts the sampled input current from the sampled first branch current to output 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 feedforward duty cycle; and a 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 the 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 dual-current loop control module and a PWM module, wherein the sampling module is used for sampling input voltage, input current and output voltage of the PFC main circuit and 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 dual-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 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; 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 module is arranged to control the currents of the two branches respectively, so that the problem of current imbalance between 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 feedforward module and a PWM module in the Boost-PFC control circuit provided by the invention;
FIG. 3 is a schematic diagram of a PFC main circuit in a Boost-PFC control circuit according to the present invention;
fig. 4 is a flowchart of a control method of the Boost-PFC control circuit provided by 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 unbalanced current between parallel branches, thereby improving the reliability of the whole circuit.
In order to make the objects, technical solutions and effects of the present invention clearer and more specific, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of 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 dual-current loop control module 30 and a PWM (Pulse Width Modulation: 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 dual-current loop control module 30, the first PFC branch 11 and the input end and the output end of the main PFC circuit, the dual-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), and a first branch current (Ig 1 in this embodiment) of the first PFC branch 11 of the PFC main circuit 10, 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 a first control signal, and output a second driving signal (Vgs 2 in this embodiment) to the second PFC branch 12 according to a second control signal, so as to effectively control the two parallel branches.
In the invention, the sampling module 20 filters and per unit processes the input voltage, the input current, the output voltage and the first branch current of the first PFC branch 11 of the PFC main circuit 10, so as to ensure the stability and reliability of the obtained input voltage, input current, output voltage and first branch current, while per unit process is to facilitate the unification of dimensions and prevent the data overflow during the calculation of the subsequent-stage dual-current loop control module 30; meanwhile, the current is controlled by the dual-current loop control module 30 according to the input current sampled by the sampling module 20, namely 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 acquiring 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 further improved.
Further, the Boost-PFC control circuit further includes a feedforward module 50, and the feedforward module 50 is connected with the sampling module 20 and the dual-current loop control module 30 respectively; the feedforward module 50 is configured to output a feedforward voltage (Vfor in this embodiment) and a feedforward duty cycle (Dfor in this embodiment) calculated from the sampled input voltage to the dual-current loop control module 30; the feed-forward module 50 is arranged to directly feed back the front-end input voltage to the double-current-loop control module 30, so that the working range of the input voltage is widened, and the input power is ensured to be constant; the feedforward module 50 directly feeds back the duty ratio signal of the front-end input voltage to the dual-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 can be reduced, and the power factor can be 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 subtracter 35, a first adder 36 and a second adder 37, the voltage loop controller 31 is connected with the sampling module 20 and the multiplier 32, the multiplier 32 is connected with the first current loop controller 33 and the second current loop controller 34, the first current loop controller 33 is connected with the PWM module 40 through the first adder 36, and the second current loop controller 34 is connected with 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 differentiating the reference voltage (Vout in this embodiment) from the sampled output voltage; the multiplier 32 multiplies 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 a 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 a 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 feedforward 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 feedforward duty cycle, so as to facilitate effective control of the first PFC branch 11 and the second PFC branch 12.
In this embodiment, the subtractor 35 is configured to obtain the second branch current according to the sampled input current and the sampled first branch current, and the two main current are respectively input to the first current loop controller 33 and the second current loop controller 34, and after the two current loop controllers respectively compare the first branch current and the second branch current with the reference current, the first control signal and the second control signal are respectively output to the PWM module 40, so that in each switching period, each branch current is forced to be equal to the provided reference current in real time, thereby achieving the real-time current sharing effect of the two branch currents, and avoiding the situation that one of the two branches works in a large current state and the other 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 cycle feedforward loop controller 52, the voltage feedforward loop controller 51 is connected with the sampling module 20 and the multiplier 32, respectively, and the duty cycle feedforward loop controller 52 is connected with the sampling module 20, the first adder 36 and the second adder 37, respectively.
Wherein, the voltage feedforward loop controller 51 is used for outputting 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 based on the sampled input voltage and the reference voltage; in the embodiment, the input voltage working range 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; in addition, by setting the duty ratio feedforward loop controller 52, when the input voltage of the PFC main circuit 10 changes, the duty ratio output can be quickly 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 step down 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 step down 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 a second control signal, where the phases of the first driving signal and the second driving signal differ by a preset phase angle, in this embodiment, 180 °.
In this embodiment, the first converter 41 and the second converter 42 step down the first control signal and the second control signal respectively, and output them to the first driving unit 43 and the second driving unit 44, then the first driving unit 43 compares the stepped down first control signal with the carrier wave 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 wave to output the second driving signal to the second PFC branch 12, and the phases of the two driving signals are different by a preset phase angle, where the carrier wave frequency is 20KHz, the staggered conducting frequency corresponding to the output of the two driving signals is 40KHz, and the two driving signals are 180 ° out of phase.
Further, referring to fig. 3, the first PFC branch 11 includes a first power switch Q1, a first boost inductor L1, a first rectifying 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 rectifying 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 boost inductor L1 and the positive electrode of a first rectifying diode D1, the other end of the first boost inductor L1 is connected with the power input end, and the negative electrode of a second rectifying diode D2 is connected with one end of an energy storage capacitor C1, a load and the sampling module 20; the grid electrode of the second power switch tube Q2 is connected with the second driving unit 44, the source electrode of the first power switch tube Q1 is grounded, the drain electrode of the second power switch tube Q2 is connected with one end of the second boost inductor L2 and the positive electrode of the second rectifying diode D2, the other end of the second boost inductor L2 is connected with the power input end, and the negative electrode of the second rectifying diode D2 is connected with one end of the energy storage capacitor C1, the load and the sampling module 20; in this embodiment, two driving signals drive the first power switch Q1 and the second power switch Q2 to turn on or off respectively, so as to control repeated charging and discharging of the first boost inductor L1 and the second boost inductor L2, and realize voltage boost.
Based on the Boost-PFC control circuit, the invention also provides a control method of the Boost-PFC control circuit, referring to FIG. 4, the control method of the Boost-PFC control circuit comprises the following steps:
s100, a sampling module samples input voltage, input current, output voltage and first branch current of a first PFC branch of a PFC main circuit, 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 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;
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 further includes:
s10, the feedforward module outputs feedforward voltage and feedforward duty ratio obtained through 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 the multiplier after making a difference 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 to output a reference current to the first current loop controller and the second current loop controller, and outputting a second branch current to the second current loop controller after the sampled input current and the sampled first branch current are subjected to difference by a subtracter;
s230, 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;
s240, a first adder outputs a first control signal to the PWM module according to the first branch current and the feedforward duty ratio; 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 the multiplier according to the sampled input voltage;
s12, the duty ratio feedforward loop controller outputs feedforward duty ratio to the first adder and the second adder according to the sampled input voltage and the reference voltage.
In summary, the Boost-PFC control circuit and the control method thereof provided by the present invention, 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, an output voltage, and a first branch current of a first PFC branch of the PFC main circuit, 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 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; 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 module is arranged to control the currents of the two branches respectively, so that the problem of current imbalance between parallel branches can be effectively solved, and the reliability of the whole circuit is further improved.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (9)
1. The 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, the output voltage and the first branch current of the first PFC branch of the PFC main circuit, and outputting the sampled input voltage, input current, output voltage and first branch current to the dual-current loop control module;
the dual-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 double-current loop control module comprises a voltage loop controller, a multiplier, a first current loop controller, a second current loop controller, a subtracter, a first adder and a second adder, wherein 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, and the second current loop controller is connected with the PWM module through the second adder, wherein:
the voltage loop controller is used for outputting a difference voltage to the multiplier after the reference voltage and the sampled output voltage are subjected to difference;
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 differencing the sampled input current and the sampled first branch current and 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 configured to output the second control signal to the PWM module according to the second branch current and the feedforward duty cycle;
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 feedforward module includes a voltage feedforward loop controller and a duty cycle feedforward loop controller, the voltage feedforward loop controller being respectively connected with the sampling module and the multiplier, the duty cycle feedforward loop controller being 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.
4. The Boost-PFC control circuit of claim 3 wherein the PWM module comprises a first converter, a second converter, a first drive unit, and a second drive unit, the first converter being connected to the first adder and the first drive unit, respectively, the second converter being connected to the second adder and the second drive unit, respectively; wherein:
the first converter is used for carrying out step-down 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 step-down processing on the second control signal and outputting the second control signal to the second driving unit;
the second driving unit is used for outputting a second driving signal to the second PFC branch according to the second control signal, and the phase difference between the first driving signal and the second driving signal is preset phase angle.
5. The Boost-PFC control circuit of claim 4 wherein the first PFC branch comprises a first power switch 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 boost inductor and the anode of the first rectifying diode, and the other end of the first boost inductor is connected with the power input end.
6. A control method based on the Boost-PFC control circuit according to any one of claims 1 to 5, characterized in that
The method comprises the following steps:
the sampling module samples the input voltage, the input current, the output voltage and the first branch current of the first PFC branch of the PFC main circuit, 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, 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 after obtaining a second branch current according to the sampled input current and the sampled first branch current;
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.
7. The control method according to claim 6, 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 further comprises:
and the feedforward module outputs feedforward voltage and feedforward duty ratio obtained according to the sampled input voltage to the double-current-loop control module.
8. The control method according to claim 7, wherein the step of the dual current loop control module obtaining the reference current from the sampled input voltage and the sampled output voltage, obtaining the second branch current from the sampled input current and the sampled first branch current, and outputting the first control signal obtained from the reference current and the first branch current and the second control signal obtained from the reference current and the second branch current to the PWM module comprises:
the voltage ring controller is used for outputting a difference voltage to the multiplier after making a difference between the reference voltage and the sampled output voltage;
the multiplier multiplies the sampled input voltage, the difference voltage and the feedforward voltage to output reference current to the first branch current loop controller and the second current loop controller, and the subtracter subtracts the sampled input current from the sampled first branch current to output the 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 feedforward duty cycle; and a second adder outputs the second control signal to the PWM module according to the second branch current and the feedforward duty ratio.
9. The control method according to claim 8, 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 includes: the voltage feedforward loop controller outputs feedforward voltage to the 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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