CN107332437B - Single-inductor bridgeless APFC circuit - Google Patents
Single-inductor bridgeless APFC circuit Download PDFInfo
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- CN107332437B CN107332437B CN201710718217.XA CN201710718217A CN107332437B CN 107332437 B CN107332437 B CN 107332437B CN 201710718217 A CN201710718217 A CN 201710718217A CN 107332437 B CN107332437 B CN 107332437B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a single-inductor bridgeless APFC circuit which comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1 and a second voltage dividing resistor R2; the first end part of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1 are connected with a power supply live wire; the second end part of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line; the first end of the inductor L is connected with the collector of the first IGBT module S1 and the anode of the first power diode D1; the second end of the inductor L is connected to the collector of the second IGBT module S2 and the anode of the fourth power diode D4.
Description
Technical Field
The invention relates to a single-inductance bridgeless APFC circuit in the field of single-phase power factor correction.
Background
The power electronic converter adopts an uncontrolled rectifier bridge and an electrolytic capacitor as a front-stage circuit in a single-phase power grid, no matter what impedance load is connected to a rear stage, the power electronic converter belongs to nonlinear loads, harmonic current pollution is generated to the power grid, harmonic current limit values specified in IEC 61000-3-2 and IEC 61000-3-1 cannot be met, and power factor of the grid side is low, so that power factor correction measures are required.
However, the conventional bridgeless pfc must use two inductors, the current flow direction is uncertain, the low-frequency diode and the diode in the IGBT module may be turned on at the same time, an unstable factor is increased, and the topology cost of the double inductors is high, which occupies a large volume. Therefore, a single-inductor bridgeless single-phase power factor correction circuit needs to be found to solve the problems.
Through the search of the prior art of the bridgeless power factor corrector, for example, the analysis and design of the single-phase bridgeless power factor corrector in the document disclosed in the electric application 2015 in the 8 th period provides an acyclic flow type single-phase bridgeless APFC which adopts single period to control the bridgeless power factor corrector
The scheme is that the circuit is the same as the traditional bridgeless APFC, is a double-inductance circuit, has higher cost and larger occupied space, and does not meet the development direction of the traditional power factor corrector.
By combining the above, the prior art of the bridgeless power factor corrector finds that the prior circuits are of double-inductance structures and cannot meet the requirements of the prior practical application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a single-inductor bridgeless APFC circuit which only adopts one inductor compared with the traditional bridgeless APFC circuit, thereby saving cost and on-board space and enabling the design of a driving circuit to be more convenient.
The technical scheme for achieving the purpose is as follows: a single-inductor bridgeless APFC circuit comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1 and a second voltage dividing resistor R2;
the first end part of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1 are connected with a power supply live wire;
the second end part of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line;
the first end of the inductor L is connected with the collector of the first IGBT module S1 and the anode of the first power diode D1;
the second end part of the inductor L is connected with the collector electrode of the second IGBT module S2 and the anode electrode of the fourth power diode D4;
the cathode of the first power diode D1 and the cathode of the fourth power diode D4 are connected with the anode of the direct current filter capacitor E1 and the first end part of the first divider resistor R1;
the positive electrode of the second power diode D2 is connected with the positive electrode of the third power diode D3, the negative electrode of the direct current filter capacitor E1 and the first end part of the second voltage dividing resistor R2 to form a negative output end;
the second end of the first voltage dividing resistor R1 is connected with the second end of the second voltage dividing resistor R2 to form a direct current side sampling end.
Further, a first end part of the alternating current filter capacitor C1, a cathode of the second power diode D2 and an emitter of the first IGBT module S1 are connected with a power supply live wire to form an input voltage and input current sampling end;
the cathode of the first power diode D1 and the cathode of the fourth power diode D4 are connected with the anode of the direct current filter capacitor E1 and the first end of the first voltage dividing resistor R1 to form a positive output end.
Still further, the single-inductor bridgeless APFC circuit further comprises a drive circuit comprising:
collecting effective values U of the input voltage at the input voltage and input current sampling end iRMS A valid value calculation module of (a);
the effective value calculating module is connected to calculate the effective value reciprocal square 1/U of the input voltage 2 iRMS An effective value reciprocal square calculation module;
collecting output voltage u at the DC side sampling end 0 And is combined withWill output voltage u 0 And output voltage reference value u r Comparing to obtain voltage error e v A second multiplier of (a);
for voltage error e v Proportional integral regulation is carried out to obtain a voltage reference value u vc A voltage loop quasi PI regulation module;
according to the effective value of the input voltage, the square reciprocal is 1/U 2 iRMS And a voltage reference value u vc Obtaining a reference current i r Is a first multiplier of (a);
input current i at input voltage and input current sampling end L Sampling and inputting current i L And reference current i r Comparing to obtain a current error e i A third multiplier of (2);
for current error e i Proportional integral regulation is carried out to obtain a power supply voltage u cc A current loop quasi PI regulation module;
for the power supply voltage u cc Performing dispersion to obtain a driving voltage u cd Is a signal discrete module of (a);
by applying a driving voltage u cd Chopping is carried out to obtain a pulse forming module of PWM1 pulse signals for driving the first IGBT module S1;
and the pulse complementary module is connected with the pulse forming module and used for forming a pulse complementary signal with the PWM1 pulse signal and driving a PWM2 pulse signal of the second IGBT module S2.
Further, the first end of the ac filter capacitor C1, the cathode of the second power diode D2, and the emitter of the first IGBT module S1 are connected to the power line through the bidirectional switch BS 1; the first end of the bidirectional switch BS1 is connected with a power live wire to form an input voltage and input current sampling end, and the second end of the bidirectional switch BS1 is connected with the first end of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1;
the cathode of the first power diode D1 and the cathode of the fourth power diode D4 are connected with the anode of the direct current filter capacitor and the first end part of the first voltage dividing resistor R1 through a third IGBT module S3; the collector of the third IGBT module S3 is connected with the cathode of the first power diode D1 and the cathode of the fourth power diode D4, and the emitter of the third IGBT module S3 is connected with the anode of the direct current filter capacitor E1 and the first end of the first voltage dividing resistor R1 to form a positive output end.
Still further, the single-inductor bridgeless APFC circuit further comprises a drive circuit comprising:
collecting effective values U of the input voltage at the input voltage and input current sampling end iRMS A valid value calculation module of (a);
the effective value calculating module is connected to calculate the effective value reciprocal square 1/U of the input voltage 2 iRMS An effective value reciprocal square calculation module;
collecting output voltage u at the DC side sampling end 0 And will output voltage u 0 And output voltage reference value u r Comparing to obtain voltage error e v A second multiplier of (a);
for voltage error e v Proportional integral regulation is carried out to obtain a voltage reference value u vc A voltage loop quasi PI regulation module;
according to the effective value of the input voltage, the square reciprocal is 1/U 2 iRMS And a voltage reference value u vc Obtaining a reference current i r Is a first multiplier of (a);
input current i at input voltage and input current sampling end L Sampling and inputting current i L And reference current i r Comparing to obtain a current error e i A third multiplier of (2);
for current error e i Proportional integral regulation is carried out to obtain a power supply voltage u cc A current loop quasi PI regulation module;
for the power supply voltage u cc Performing dispersion to obtain a driving voltage u cd Is a signal discrete module of (a);
by applying a driving voltage u cd Chopping is carried out to obtain a pulse forming module of PWM1 pulse signals for driving the first IGBT module S1 and the bidirectional switch BS 1;
and the pulse complementary module is connected with the pulse forming module and used for forming a pulse complementary signal with the PWM1 pulse signal and driving a PWM2 pulse signal of the second IGBT module S2.
Further, the driving signal of the third IGBT module S3 can be switched between the PWM1 pulse signal and the PWM2 pulse signal.
The technical scheme of the single-inductor bridgeless APFC circuit comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1 and a second voltage dividing resistor R2; the first end part of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1 are connected with a power supply live wire; the second end part of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line; the first end of the inductor L is connected with the collector of the first IGBT module S1 and the anode of the first power diode D1; the second end part of the inductor L is connected with the collector electrode of the second IGBT module S2 and the anode electrode of the fourth power diode D4; the cathode of the first power diode D1 and the cathode of the fourth power diode D4 are connected with the anode of the direct current filter capacitor E1 and the first end part of the first divider resistor R1; the positive electrode of the second power diode D2 is connected with the positive electrode of the third power diode D3, the negative electrode of the direct current filter capacitor E1 and the first end part of the second voltage dividing resistor R2 to form a negative output end; the second end of the first voltage dividing resistor R1 is connected with the second end of the second voltage dividing resistor R2 to form a direct current side sampling end. The technical effects are as follows: first, compared with the traditional bridgeless APFC circuit, only one inductor is adopted, so that the cost and the on-board space are saved. Second, the first IGBT module S1 and the second IGBT module S2 are complementary in pulse, so that the driving circuit is more convenient to design.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of a single-inductor bridgeless APFC circuit of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of a single-inductor bridgeless APFC circuit according to the present invention.
Fig. 3 is a schematic diagram of a driving circuit of a single-inductor bridgeless APFC circuit according to the present invention.
Detailed Description
Referring to fig. 1 to 3, in order to better understand the technical solutions of the present invention, the following detailed description is given by specific embodiments with reference to the accompanying drawings:
example 1
The invention discloses a single-inductor bridgeless APFC circuit which comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1 and a second voltage dividing resistor R2.
The first end of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1 are connected with a power live wire to form an input voltage and input current sampling end, and the input current i can be sampled at the point L And input voltage u i 。
The second end of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line.
The first end of the inductor L is connected to the collector of the first IGBT module S1 and the anode of the first power diode D1.
The second end of the inductor L is connected to the collector of the second IGBT module S2 and the anode of the fourth power diode D4.
The cathode of the first power diode D1 is connected with the cathode of the fourth power diode D2, the anode of the direct current filter capacitor E1 and the first end of the first voltage dividing resistor R1 to form a positive output end.
The positive electrode of the second power diode D2 is connected with the positive electrode of the third power diode D3, the negative electrode of the direct current filter capacitor E1 and the first end of the second voltage dividing resistor R2 to form a negative output end.
The second end of the first voltage dividing resistor R1 is connected with the second end of the second voltage dividing resistor R2 to form a DC side sampling end, at which point the DC output voltage u can be collected 0 。
The single-inductor bridgeless APFC circuit is provided with a driving circuit and comprises an effective value calculating module 1, an effective value square reciprocal calculating module 2, a quasi-PI regulating module, a signal dispersing module 4, a pulse forming module 5 and a pulse supplementing module 6. The quasi PI regulation modules are divided into a voltage quasi PI regulation module 31 and a current quasi PI regulation module 32.
The effective value calculation module 1 samples the input voltage u at the input voltage and input current sampling terminals i And thus the effective value U of the input voltage iRMS The effective value reciprocal square calculation module 2 calculates to obtain the effective value reciprocal square 1/U of the input voltage 2 iRMS The effective value square reciprocal calculation module 2 calculates the voltage effective value square reciprocal 1/U 2 iRMS To the first multiplier 71.
The second multiplier 72 samples the output voltage u at the DC side sampling end 0 And will output voltage u 0 And the output voltage reference value u r Comparing to obtain the difference between the two, namely the voltage error e v Voltage error e v Input voltage level PI adjusting module 31, voltage level PI adjusting module 31 adjusts voltage error e v Proportional integral regulation is carried out, and the voltage error e is regulated by a voltage quasi PI regulating module 31 v Voltage reference value u obtained after proportional integral adjustment vc To the first multiplier 71.
The first multiplier 71 is 1/U based on the inverse square of the effective value of the input voltage 2 iRMS And a voltage reference value u vc Obtaining a reference current i r Output to the third multiplier 73, and the third multiplier 73 samples the input current i at the input voltage and input current sampling terminals L Sampling and comparing with reference current i r After comparison, the current error e is obtained i Error of current e i Input current loop PI regulation module 32, current loop PI regulation module 32 is responsive to current error e i Proportional integral regulation is carried out to obtain a power supply voltage u cc Supply voltage u cc The signal discretizing module 4 discretizes to obtain a driving voltage u cd Drive voltage u cd Is fed into the pulse forming module 5, and the pulse forming module 5 is driven by the internally generated pair of internal triangular wavesVoltage u cd Chopping is carried out to form a PWM1 pulse signal, the PWM1 pulse signal is used for driving the first IGBT module S1, the PWM1 pulse signal is simultaneously output to the pulse complementation module 6, and the pulse complementation module 6 outputs a pulse complementary to the PWM1, namely a PWM2 pulse signal, and the pulse complementation module 6 is used for driving the second IGBT module S2.
According to the single-inductor bridgeless APFC circuit, the on-off of the first IGBT module S1 and the second IGBT module S2 is controlled through two paths of complementary PWM pulse signals, and the boosting of the single-inductor bridgeless APFC is realized by utilizing the first power diode D1, the second power diode D2, the third power diode D3 and the fourth power diode D4.
Compared with the prior art, the invention has the following beneficial effects:
first, compared with the traditional bridgeless APFC circuit, only one inductor is adopted, so that the cost and the on-board space are saved.
Second, the first IGBT module S1 and the second IGBT module S2 are complementary in pulse, so that the driving circuit is more convenient to design.
Third, the first IGBT module S1 and the second IGBT module S2 are driven by complementary PWM pulses, so that the cost and the on-board volume are reduced, the principle is clear, and the control signal generation is simple.
In this embodiment:
alternating current input voltage range is 220 V+/-15%, power frequency is 50Hz or 60Hz, rated output direct current average voltage is 390V, and input power is 6kW.
The inductance L has a parameter of 2.2mh,40a.
40kHz of the chopping frequency of the first IGBT module S1 and the second IGBT module S2.
The DC filter capacitor E1 has a parameter of 450V,0.47uF.
The first voltage dividing resistor R1 has a parameter of 3mΩ and 5W.
The parameters of the second voltage dividing resistor R1 are as follows: 16.8Ω,5W.
The parameters of the first power diode D1, the second power diode D2, the third power diode D3 and the fourth power diode D4 are as follows: 600V,40A/100 ℃;
in the charging process of the inductor L, the first IGBT module S1 is turned off, and the second IGBT module S2 is turned on; in the discharging process of the inductor L, the first IGBT module S1 is turned on, and the second IGBT module S2 is turned off; the first power diode D1, the second power diode D2, the third power diode D3, and the fourth power diode D4 form a charge-discharge circuit.
Example 2
The invention discloses a single-inductor bridgeless APFC circuit which comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, a third IGBT module S3, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1, a second voltage dividing resistor R2 and a bidirectional switch BS1.
The first end of the bidirectional switch BS1 is connected with a power live wire to form an input voltage and input current sampling end, at which the input current i can be sampled L And input voltage u i 。
The second end of the bidirectional switch BS1, the first end of the ac filter capacitor C1, and the negative electrode of the second power diode D2 are connected to the emitter of the first IGBT module S1.
The second end of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line.
The first end of the inductor L is connected to the collector of the first IGBT module S1 and the anode of the first power diode D1.
The second end of the inductor L is connected to the collector of the second IGBT module S2 and the anode of the fourth power diode D4.
The positive electrode of the third power diode D3, the positive electrode of the second power diode D2 and the negative electrode of the direct current filter capacitor E1 are connected with the first end of the second voltage dividing resistor R2 to form a negative output end.
The negative electrode of the first power diode D1 and the negative electrode of the fourth power diode D4 are connected with the collector electrode of the third IGBT module S3, and the emitter electrode of the third IGBT module S3 is connected with the positive electrode of the direct current filter capacitor E1 and the first end part of the first voltage dividing resistor R1 to form a positive output end.
The second end of the first voltage dividing resistor R1 is connected with the second end of the second voltage dividing resistor R2 to form a direct current side sampling end.
The single-inductor bridgeless APFC circuit is provided with a driving circuit and comprises an effective value calculating module 1, an effective value square reciprocal calculating module 2, a quasi-PI regulating module, a signal dispersing module 4, a pulse forming module 5 and a pulse supplementing module 6. The quasi PI regulation modules are divided into a voltage quasi PI regulation module 31 and a current quasi PI regulation module 32.
The effective value calculation module 1 samples the input voltage u at the input voltage and input current sampling terminals i And thus the effective value U of the input voltage iRMS The effective value reciprocal square calculation module 2 calculates to obtain the effective value reciprocal square 1/U of the input voltage 2 iRMS The effective value square reciprocal calculation module 2 calculates the voltage effective value square reciprocal 1/U 2 iRMS To the first multiplier 71.
The second multiplier 72 samples the output voltage u at the DC side sampling end 0 And will output voltage u 0 And the output voltage reference value u r Comparing to obtain the difference between the two, namely the voltage error e v Voltage error e v Input voltage level PI adjusting module 31, voltage level PI adjusting module 31 adjusts voltage error e v Proportional integral regulation is carried out, and the voltage error e is regulated by a voltage quasi PI regulating module 31 v Voltage reference value u obtained after proportional integral adjustment vc To the first multiplier 71.
The first multiplier 71 is 1/U based on the inverse square of the effective value of the input voltage 2 iRMS And a voltage reference value u vc Obtaining a reference current i r Output to the third multiplier 73, and the third multiplier 73 samples the input current i at the input voltage and input current sampling terminals L Sampling and comparing with reference current i r After comparison, the current error e is obtained i Error of current e i Input current loop PI regulation module 32, current loop PI regulation module 32 is responsive to current error e i Proportional integral regulation is carried out to obtain a power supply voltage u cc Supply voltage u cc The input signal discretizing module 4 discretizes to obtain a driving voltage u cd Drive voltage u cd Is fed into a pulse forming dieA block 5 for generating an internal triangle wave pair driving voltage u by the internal triangle wave pair cd Chopping is performed to form a PWM1 pulse signal, the PWM1 pulse signal is used for driving the first IGBT module S1 and the bidirectional switch BS1, the PWM1 pulse signal is simultaneously output to the pulse complementation module 6, and the pulse complementation module 6 outputs a pulse complementary to the PWM1 pulse signal, namely a PWM2 pulse signal, and the pulse complementation module 6 is used for driving the second IGBT module S2. The bi-directional switch BS1 is driven by the pulse forming module 5, and the driving signal of the third IGBT module 3 can be switched between the PWM1 pulse signal and the PWM2 pulse signal.
Compared with the prior art, the invention has the following beneficial effects:
and a single inductor L is adopted for energy storage, so that the cost and the on-board space are saved.
The boost and buck control of the output direct current voltage is realized.
The driving pulses required by the first IGBT module S1 and the second IGBT module S2 are complementary, so that the driving circuit is more convenient to design.
According to the single-inductor bridgeless APFC circuit, driving pulses required by the first IGBT module S1 and the second IGBT module S2 are complementary, the on-off of the bidirectional switch BS1 is controlled to realize voltage reduction, the inductor L is adopted, the cost and the volume are reduced, the principle is clear, and the control signal generation is simple.
The parameters of each device in this embodiment are:
alternating current input voltage range is 220 V+/-15%, power frequency is 50Hz or 60Hz, rated output direct current average voltage is 390V, and input power is 6kW.
The inductance L has a parameter of 2.2mh,40a.
The chopping frequency of the first IGBT module S1, the second IGBT module S2, and the third IGBT module 3 is 40kHz.
The DC filter capacitor E1 has a parameter of 450V,0.47uF.
The first voltage dividing resistor R1 has a parameter of 3mΩ and 5W.
The parameters of the second voltage dividing resistor R1 are as follows: 16.8Ω,5W.
The parameters of the first power diode D1, the second power diode D2, the third power diode D3 and the fourth power diode D4 are as follows: 600V,40A/100 ℃.
The bidirectional switch BS1 is turned off with the first IGBT module S1, and when the second IGBT module S2 is turned on with the third IGBT module S3, the inductor L is charged; the bidirectional switch BS1 is connected with the first IGBT module S1, the second IGBT module S2 is disconnected with the third IGBT module S3, the inductor L is discharged through a loop formed by the third IGBT module S3, the first power diode D1, the second power diode D2, the third power diode D3 and the fourth power diode D4, and the power supply does not charge the direct current side, so that the step-down process is completed.
When the bidirectional switch BS1 and the third IGBT module S3 are in the on state all the time, boosting can be achieved.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (3)
1. A single-inductor bridgeless APFC circuit comprises an alternating current filter capacitor C1, a first IGBT module S1, a second IGBT module S2, an inductor L, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a direct current filter capacitor E1, a first voltage dividing resistor R1 and a second voltage dividing resistor R2; the method is characterized in that:
the first end part of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1 are connected with a power supply live wire through a bidirectional switch BS 1;
the first end of the bidirectional switch BS1 is connected with a power live wire to form an input voltage and input current sampling end, and the second end of the bidirectional switch BS1 is connected with the first end of the alternating current filter capacitor C1, the cathode of the second power diode D2 and the emitter of the first IGBT module S1;
the second end part of the alternating current filter capacitor C1, the cathode of the third power diode D3 and the emitter of the second IGBT module S2 are connected with a power zero line;
the first end of the inductor L is connected with the collector of the first IGBT module S1 and the anode of the first power diode D1;
the second end part of the inductor L is connected with the collector electrode of the second IGBT module S2 and the anode electrode of the fourth power diode D4;
the cathode of the first power diode D1 and the cathode of the fourth power diode D4 are connected with the anode of the direct current filter capacitor and the first end part of the first voltage dividing resistor R1 through a third IGBT module S3;
the collector of the third IGBT module S3 is connected with the cathode of the first power diode D1 and the cathode of the fourth power diode D4, and the emitter of the third IGBT module S3 is connected with the anode of the direct current filter capacitor E1 and the first end part of the first voltage dividing resistor R1 to form a positive output end;
the positive electrode of the second power diode D2 is connected with the positive electrode of the third power diode D3, the negative electrode of the direct current filter capacitor E1 and the first end part of the second voltage dividing resistor R2 to form a negative output end;
the second end of the first voltage dividing resistor R1 is connected with the second end of the second voltage dividing resistor R2 to form a direct current side sampling end.
2. The single inductance bridgeless APFC circuit of claim 1, wherein: it also includes a drive circuit comprising:
collecting effective values U of the input voltage at the input voltage and input current sampling end iRMS A valid value calculation module of (a);
the effective value calculating module is connected to calculate the effective value reciprocal square 1/U of the input voltage 2 iRMS An effective value reciprocal square calculation module;
collecting output voltage u at the DC side sampling end 0 And will output voltage u 0 And output voltage reference value u r Comparing to obtain voltage error e v A second multiplier of (a);
for voltage error e v Proportional integral regulation is carried out to obtain a voltage reference value u vc A voltage loop quasi PI regulation module;
according to the effective value of the input voltage, the square reciprocal is 1/U 2 iRMS And a voltage reference value u vc Obtaining a reference current i r Is the first of (2)A multiplier;
input current i at input voltage and input current sampling end L Sampling and inputting current i L And reference current i r Comparing to obtain a current error e i A third multiplier of (2);
for current error e i Proportional integral regulation is carried out to obtain a power supply voltage u cc A current loop quasi PI regulation module;
for the power supply voltage u cc Performing dispersion to obtain a driving voltage u cd Is a signal discrete module of (a);
by applying a driving voltage u cd Chopping is carried out to obtain a pulse forming module of PWM1 pulse signals for driving the first IGBT module S1 and the bidirectional switch BS 1;
and the pulse complementary module is connected with the pulse forming module and used for forming a pulse complementary signal with the PWM1 pulse signal and driving a PWM2 pulse signal of the second IGBT module S2.
3. A single inductance bridgeless APFC circuit according to claim 2, wherein: the driving signal of the third IGBT module S3 can be switched between the PWM1 pulse signal and the PWM2 pulse signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710718217.XA CN107332437B (en) | 2017-08-21 | 2017-08-21 | Single-inductor bridgeless APFC circuit |
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| CN201710718217.XA CN107332437B (en) | 2017-08-21 | 2017-08-21 | Single-inductor bridgeless APFC circuit |
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