CN117411306A - Bridge-free buck-boost PFC converter with three switching tube buck-boost conversion units connected in parallel for output - Google Patents
Bridge-free buck-boost PFC converter with three switching tube buck-boost conversion units connected in parallel for output Download PDFInfo
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- CN117411306A CN117411306A CN202311266502.4A CN202311266502A CN117411306A CN 117411306 A CN117411306 A CN 117411306A CN 202311266502 A CN202311266502 A CN 202311266502A CN 117411306 A CN117411306 A CN 117411306A
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Classifications
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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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- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
-
- 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
- H02M1/4291—Arrangements for improving power factor of AC input by using a Buck converter to switch the input current
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses a bridge-free buck-boost PFC converter with three switching tube buck-boost conversion units connected in parallel for output, and relates to the technical field of PFC converters; the PFC converter topological structure comprises a MOS tube S 1 MOS tube S 2 Rectifier diode D R1 Rectifier diode D R2 Freewheel diode D 1 Freewheel diode D 2 Reflux diode D 3 Reflux diode D 4 Inductance L 1 Inductance L 2 Output capacitance C o The method comprises the steps of carrying out a first treatment on the surface of the The MOS tube S 2 Inductance L 2 Freewheel diode D 2 Reflux diode D 4 Three switching tube up-down voltage conversion unit 2 combined with rectifier diodeTube D R2 For effecting electrical energy conversion within the positive half-cycle of the ac input; the MOS tube S 1 Inductance L 1 Freewheel diode D 1 Reflux diode D 3 Constitutes a three-switch tube buck-boost conversion unit 1, and is combined with a rectifier diode D R1 For effecting power conversion within the negative half-cycle of the ac input; and the two three-switch-tube buck-boost conversion units are input, output and parallel connected to obtain the bridgeless buck-boost PFC converter.
Description
Technical Field
The invention belongs to the technical field of PFC converters, and particularly relates to a bridgeless buck-boost PFC converter with parallel output of three switching tube buck-boost conversion units.
Background
Alternating current input current distortion typically occurs in alternating current-to-direct current (AC-DC) conversion circuits due to the wide application of nonlinear elements such as diodes, MOSFETs, and the like, switching elements. Therefore, it is often desirable to employ power factor correction (Power Factor Correction, PFC) techniques in AC-DC conversion.
At present, a Boost PFC converter constructed by a Boost conversion unit is generally used between a rectifier bridge and a load circuit, so that power factor correction and post-stage control of output are realized. However, because of the Boost characteristic of the Boost converter, the output voltage of the Boost converter is generally 380-400V, and therefore, a step-down circuit needs to be added at a later stage to meet the load requirements of an LED, charging of a battery, driving of a motor of a low-voltage battery, and the like. The whole efficiency of a two-stage AC-DC conversion structure system formed by the existing Boost PFC converter and a subsequent stage buck converter is not high.
Correspondingly, the Buck (Buck) PFC converter has low-voltage output characteristics, and is particularly suitable for the application field of low-voltage output. However, the buck PFC converter cannot provide a wide output voltage range for the subsequent stage circuit because of the current distortion problem caused by the dead zone of the input current of the buck PFC converter unit, which is not beneficial to the speed regulation control of the dc brushless motor.
Accordingly, a conversion unit with buck-boost (buck-boost) function can also be used for PFC topology to implement power factor correction. The buck-boost PFC converter can realize wide-range voltage output and maintain high power factor of an input side, so that the buck-boost PFC converter is suitable for low-voltage application occasions with wide output voltage requirements, such as motor drive, adjustable LEDs and the like.
In addition, the rectifier bridge of the PFC converter has a large conduction loss when it is turned on. And with the reduction of the device cost, the rise of the electric charge operation cost and the promotion of society to low carbon, the operation efficiency of the converter has become more and more important. Therefore, under the large background of constructing a low-carbon society, the traditional PFC converter based on the rectifier bridge structure is further deduced to be a bridgeless PFC converter, and the PFC converter has important academic research and engineering application values.
Fig. 1 shows a conventional bridgeless Buck PFC converter. Although such buck PFC converters can achieve low voltage output, they must limit their own output voltage V due to the large input current dead zone of the input current as shown in fig. 2 o . The dead zone of the input current is essentially because the buck conversion unit can only work in a buck mode when outputting the voltage V o Greater than the input voltage v in When the input current is 0, an input current dead zone is generated on the input side. To limit such input current dead zone, typically Buck-type PFC converters can only limit their output voltage V o Thereby achieving an acceptable input power factor PF. Such a bridgeless Buck PFC converter cannot achieve output characteristics with a wide output voltage range.
The invention constructs a bridgeless buck-boost PFC converter and provides a bridgeless buck-boost PFC converter with parallel output of three switching tube buck-boost conversion units.
Disclosure of Invention
The invention aims to provide a bridgeless Buck-boost PFC converter with parallel output of a three-switch-tube Buck-boost conversion unit, so as to solve the problems that in the prior art, a rectifier bridge of the PFC converter has larger conduction loss when being conducted, and the bridgeless Buck PFC converter cannot realize the output characteristics with a wide output voltage range.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the three-switching tube buck-boost conversion unit outputs the bridgeless buck-boost PFC converter in parallel, and the topological structure of the buck-boost PFC converter comprises an MOS tube S 1 MOS tube S 2 Rectifier diode D R1 Rectifier diode D R2 Freewheel diode D 1 Freewheel diode D 2 Reflux diode D 3 Reflux diode D 4 Inductance L 1 Inductance L 2 Output capacitance C o ；
The MOS tube S 2 Inductance L 2 Freewheel diode D 2 Reflux diode D 4 A three-switch-tube buck-boost conversion unit 2 is formed, and the three-switch-tube buck-boost conversion unit 2 is combined with a rectifier diode D R2 For effecting electrical energy conversion within the positive half-cycle of the ac input;
the MOS tube S 1 Inductance L 1 Freewheel diode D 1 Reflux diode D 3 A three-switch-tube buck-boost conversion unit 1 is formed, and the three-switch-tube buck-boost conversion unit 1 is combined with a rectifier diode D R1 For effecting power conversion within the negative half-cycle of the ac input;
the three-switching-tube buck-boost conversion unit 1 and the three-switching-tube buck-boost conversion unit 2 are input, output and parallel connected to obtain the bridgeless buck-boost PFC converter.
Preferably, one end of the AC input side is connected with a rectifier diode D R2 Anode connection of (D) reflux diode D 3 The other end of the AC input side is connected with a rectifying diode D R1 Anode of (D) and reflux diode D 4 Is connected with the cathode of the battery;
rectifier diode D R2 Cathode of (2) and MOS tube S 2 Drain electrode connection of MOS tube S 2 The source electrode of (C) is respectively connected with the flywheel diode D 2 Cathode connection, inductance L 2 Is connected with one end of the connecting rod;
rectifier diode D R1 Cathode of (2) and MOS tube S 1 Drain electrode connection of MOS tube S 1 The source electrode of (C) is respectively connected with the flywheel diode D 1 Cathode, inductance L of (2) 1 Is connected with one end of the connecting rod;
inductance L 2 And the other end of (2) and inductance L 1 Is connected to the other end of the reflux diode D 3 Anode of (D) and reflux diode D 4 Anode, output capacitance C of (2) o One end of the anode and one end of the load are connected;
freewheel diode D 2 Anode of (D) and freewheeling diode D 1 Is connected with the anode of the output capacitor C o The other end of the load is connected with the negative electrode of the load.
Preferably, the MOS tube S in the PFC converter topology structure 1 MOS tube S 2 Can be simultaneously turned on and off, and the MOS tube S 1 MOS tube S 2 Can be controlled with the same drive signal.
Preferably, the output voltage V of the PFC converter o Sampling signal and output reference voltage V o,ref Comparing, PI parameter adjustment to obtain error feedback signal, comparing the error feedback signal with triangular wave to generate output signal of comparator for directly driving MOS tube S 1 MOS tube S 2 。
The control method of the bridge-free buck-boost PFC converter comprises the following steps of:
working mode 1: MOS tube S 2 In a conducting state, the input end passes through the MOS tube S 2 Rectifier diode D R2 Reflux diode D 4 Inductance L 2 Charging, inductor current i L2 Linearly rising, MOS tube S 2 Is equal to the current of the inductor i L2 Is the same in magnitude and direction;
working mode 2: MOS tube S 2 Turn-off, freewheeling diode D 2 Conducting and storing in the inductor L 2 Is used for supplying energy to a load end, and the inductive current i L2 Linear decrease;
working mode 3: MOS tube S 2 In the off state, output capacitor C o Supplying power to the load;
working mode 4: MOS tube S 1 In a conducting state, the input end passes through the MOS tube S 1 Rectifier diode D R1 Reflux diode D 3 Inductance L 1 Charging, inductor current i L1 Linearly rising, MOS tube S 1 Is equal to the current of the inductor i L1 Is the same in magnitude and direction;
working mode 5: MOS tube S 1 Turn-off, freewheeling diode D 1 Conducting and storing in the inductor L 1 Is used for supplying energy to a load end, and the inductive current i L1 Linear decrease;
working mode 6: MOS tube S 1 In the disconnected state, deliverOutput capacitor C o To power the load.
Compared with the prior art, the invention has the beneficial effects that:
(1) The PFC function of the converter can be realized through simple control; the double MOS tubes can be controlled by adopting identical driving signals, and PFC (power factor correction) function and wide output voltage regulation can be realized only by voltage loop control.
(2) The invention can realize high PF in a wider output voltage range; the bridgeless Buck-boost PFC converter has no dead zone of input current, so that the converter can keep high PF and low THDi under wide output voltage (the existing bridgeless Buck PFC converter can only be generally set to 160V or below).
(3) The present invention eliminates the use of a rectifier bridge to maintain efficient operation of the converter.
Drawings
Fig. 1 is a topology diagram of a prior art bridgeless Buck PFC converter;
FIG. 2 is a waveform diagram of input voltage and current of a prior art bridgeless Buck PFC converter in a half power frequency period of AC input;
fig. 3 is a topology of a bridgeless buck-boost PFC converter according to the present invention;
fig. 4 is a schematic diagram of the mode of operation of the positive half-cycle bridgeless buck-boost PFC converter of the present invention;
fig. 5 is a schematic diagram of the mode of operation of the negative half-cycle bridgeless buck-boost PFC converter of the present invention;
fig. 6 is a waveform diagram of a key device of the bridgeless buck-boost PFC converter of the present invention during a positive half cycle of an ac input;
fig. 7 is a schematic diagram of a control implementation of a bridgeless buck-boost PFC converter with a parallel output of a buck-boost converter unit with three switching tubes according to the present invention;
FIG. 8 is a diagram of driving signals of a bridge-free buck-boost PFC converter output by a three-switch-tube buck-boost conversion unit in parallel;
FIG. 9 is a waveform diagram of a simulation output of a bridge-free buck-boost PFC converter 200V output by a three-switch-tube buck-boost conversion unit in parallel;
fig. 10 is a 100V output simulation waveform diagram of a bridgeless buck-boost PFC converter with a three-switch buck-boost converter unit in parallel output according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
referring to fig. 3, fig. 3 illustrates a topology structure of a PFC converter according to the present invention, and a bridgeless buck-boost PFC converter is implemented mainly by using two buck-boost conversion units with three switching tubes outputting forward voltages.
The three-switching tube buck-boost conversion unit outputs the bridgeless buck-boost PFC converter in parallel, it mainly includes MOS tube S 1 MOS tube S 2 Rectifier diode D R1 Rectifier diode D R2 Freewheel diode D 1 Freewheel diode D 2 Reflow diode D 3 Reflux diode D 4 Output capacitance C o Inductance L 1 Inductance L 2 The method comprises the steps of carrying out a first treatment on the surface of the The bridgeless buck-boost PFC converter with the buck-boost capability is obtained by carrying out input-parallel output-parallel connection on two three-switch-tube buck-boost conversion units.
In FIG. 3, MOS transistor S 2 Inductance L 2 Rectifier diode D R2 Freewheel diode D 2 Reflux diode D 4 For effecting electrical energy conversion within the positive half-cycle of the ac input; correspondingly, MOS tube S 1 Inductance L 1 Rectifier diode D R1 Freewheel diode D 1 Reflux diode D 3 For effecting a power conversion within the negative half-cycle of the ac input.
Specifically, one end of the ac input side is connected to a rectifier diode D R2 Anode connection of (D) reflux diode D 3 Is connected to the cathode of the battery. AC inputThe other end of the side is connected with a rectifying diode D R1 Anode of (D) and reflux diode D 4 Is connected to the cathode of the battery. MOS tube S 1 Drain electrode of (D) and rectifying diode D R1 Cathode connection of MOS tube S 1 The source electrode of (C) is respectively connected with the flywheel diode D 1 Cathode, inductance L of (2) 1 Is connected to one end of the connecting rod. MOS tube S 2 Drain electrode of (D) and rectifying diode D R2 Cathode connection of MOS tube S 2 The source electrode of (C) is respectively connected with the flywheel diode D 2 Cathode connection, inductance L 2 Is connected to one end of the connecting rod. Inductance L 1 And the other end of (2) and inductance L 2 Is connected to the other end of the diode D 3 Reflux diode D 4 Anode, output capacitance C of (2) o And one end of the load is connected with the anode of the battery. Freewheel diode D 2 Freewheel diode D 1 Is connected with each other and with the output capacitor C o The other end of the load is connected with the negative electrode of the load.
Because the invention adopts the Buck-boost conversion unit, the input current of the Buck-boost conversion unit does not have dead zone due to the magnitude relation between the input voltage and the output voltage. The converter of the present invention can regulate the output voltage without having a large impact on the input PF. Furthermore, the diode D of the present invention 3 Diode D 4 The diode D is connected with the output voltage and the input side, and is known from the common mode modeling analysis of magnetic interference (electromagnetic interference, EMI) 3 Diode D 4 A path may be provided for the common mode signal and thus the common mode noise signal of the present invention is theoretically small.
In addition, when the converter is operated in an inductor current discontinuous conduction mode (discontinue conduction mode, DCM), as in other conventional Boost PFC converters, the converter needs to be configured with a differential mode (differential mode, DM) electromagnetic interference (electromagnetic interference, EMI) filter, which is not shown here for illustrating the key part of the present invention.
Referring to fig. 4 to 6, fig. 4 (a) is an equivalent circuit of an AC-DC bridgeless buck converter in an AC input positive half power frequency period in an operating mode 1, (b) is an equivalent circuit of the AC-DC bridgeless buck converter in an AC input positive half power frequency period in an operating mode 2, and (c) is an equivalent circuit of the AC-DC bridgeless buck converter in an AC input positive half power frequency period in an operating mode 3; fig. 5 (a) is an equivalent circuit of an AC-DC bridgeless buck converter in an operating mode 4 of an AC input negative half power frequency period, (b) is an equivalent circuit of an AC-DC bridgeless buck converter in an operating mode 5 of an AC input negative half power frequency period, and (c) is an equivalent circuit of an AC-DC bridgeless buck converter in an operating mode 6 of an AC input negative half power frequency period.
Since the working modes of the converter in the positive half power frequency period and the negative half power frequency period have symmetry, only the working mode in the positive half power frequency period is described below.
The invention relates to a bridge-free buck-boost PFC converter with three switching tube buck-boost conversion units connected in parallel, which has the following specific working principle:
working modes 1[0, d on T S ]: at this stage, MOS transistor S 2 In a conducting state, the input end passes through the MOS tube S 2 Rectifier diode D R2 Reflux diode D 4 Inductance L 2 Charging, inductor current i L2 Linearly rising, MOS tube S 2 Is equal to the current of the inductor i L2 Is the same in magnitude and direction.
Mode of operation 2 d on T S ,d off T S ]: at this stage, MOS transistor S 2 Turn-off, freewheeling diode D 2 Conducting and storing in the inductor L 2 Is used for supplying energy to a load end, and the inductive current i L2 The linearity decreases.
Working mode 3[ (d) on +d off )T S ,T S ]: at this stage, MOS transistor S 2 In the off state, output capacitor C o To power the load.
Referring to fig. 7 and 8, the topology structure of the invention allows two MOS transistors to be turned on and off simultaneously, so that the two MOS transistors can be driven by the same driving circuit, thereby simplifying the control of the circuit. To briefly explain the control circuit shown in fig. 7, the output voltage V o Sampling signal and output reference voltage V o,ref Comparing, and adjusting PI parameter to obtain error feedback signal, error feedback signal and threeThe angular wave comparison generates an output signal of the comparator, which can be used for directly driving two MOS tubes S 1 MOS tube S 2 . It should be noted that when the inductor current works in the intermittent conduction mode, the three-switch-tube buck-boost converter unit outputs the bridgeless buck-boost PFC converter in parallel, and the buck-boost PFC converter itself has natural input current correction capability. Therefore, the power factor correction and the output voltage regulation can be realized only by performing closed-loop control on the output voltage.
In order to verify the feasibility of the conversion circuit of the bridgeless buck-boost PFC converter output by the buck-boost conversion unit of the three switching tubes in parallel, PSIM simulation software is adopted to carry out simulation verification on the circuit.
Simulation results of the converter:
the specific parameters are as follows: the peak value of the alternating voltage is 311V (effective value 220V), the frequency is 50Hz, and the inductance L 1 And inductance L 2 150uH, output capacitance C o For 1980uF, the output voltage was 100-200V, the load was 200Ω, the peak power was 200W, the switching frequency was 50k, P was 2 in the PI parameter, and I was 0.008. In addition, an electromagnetic filter inductance L is added on the input side f And input capacitance C f Are respectively set as L f ＝2.2mH、C f ＝0.1uF。
Fig. 9 and 10 are waveform simulation diagrams of key devices with output voltages of 200V and 100V of the bridgeless buck-boost PFC converter according to the present invention. As can be seen from fig. 9 and 10, the converter of the present invention can realize voltage stabilizing output of 200V and 100V under the condition of 311V ac input peak and 50Hz frequency, and the waveforms of the main devices are stable and basically accord with the theoretical analysis waveforms. Wherein, MOS tube S 1 MOS tube S 2 Respectively at the input voltage v in The alternating operation of the positive and negative half periods of the transformer realizes the alternating current-direct current electric energy conversion without a rectifier bridge.
In order to compare the invention, the simulation parameters of the existing bridgeless Buck PFC converter are as follows: the alternating current input voltage is 311Vac, the output direct current voltage is 200V, the output capacitance is 1980uF, the inductance is 100uH, the electromagnetic filter inductance L f 2.2mH, input capacitance C f At 0.1uf, switching frequency 50kHz, output power 200W, and the same PI control parameters (p=2, i=0.008) were all used. It should be noted that the output voltage of the existing bridgeless buck PFC converter is generally limited to 160V, and in this case, for a more fair comparison with the performance of the converter according to the present invention, the output voltages of both converters are set to 200V, so as to illustrate the advantages of PF and THDi in the broader output voltage range of the converter according to the present invention.
Table 1 shows the PF value, THDi, and harmonics of the respective input currents of a conventional Buck PFC converter and a bridgeless Buck-boost PFC converter according to the invention. It can be seen that the converter of the present invention has a significantly higher PF value, lower THDi and harmonics of the respective input current than a conventional Buck PFC converter.
Table 1 comparison of the performance of the existing bridgeless Buck PFC with the converter of the present invention @200V output
According to theoretical analysis and simulation results of the invention, the bridgeless Buck-boost PFC converter obtained based on the Buck-boost conversion unit of the three-switch tube can realize stable operation and power factor correction by adopting simple single-voltage closed-loop control, and has obviously higher PF and lower THDi compared with the existing bridgeless Buck PFC converter.
The foregoing is only for aiding in understanding the method and the core of the invention, but the scope of the invention is not limited thereto, and it should be understood that the technical scheme and the inventive concept according to the invention are equivalent or changed within the scope of the invention by those skilled in the art. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (5)
1. The bridge-free buck-boost PFC converter is characterized in that the topological structure of the PFC converter comprises a MOS tube S 1 MOS tube S 2 Rectifier diode D R1 Rectifier diode D R2 Freewheel diode D 1 Freewheel diode D 2 Reflux diode D 3 Reflux diode D 4 Inductance L 1 Inductance L 2 Output capacitance C o ；
The MOS tube S 2 Inductance L 2 Freewheel diode D 2 Reflux diode D 4 A three-switch-tube buck-boost conversion unit 2 is formed, and the three-switch-tube buck-boost conversion unit 2 is combined with a rectifier diode D R2 For effecting electrical energy conversion within the positive half-cycle of the ac input;
the MOS tube S 1 Inductance L 1 Freewheel diode D 1 Reflux diode D 3 A three-switch-tube buck-boost conversion unit 1 is formed, and the three-switch-tube buck-boost conversion unit 1 is combined with a rectifier diode D R1 For effecting power conversion within the negative half-cycle of the ac input;
the three-switching-tube buck-boost conversion unit 1 and the three-switching-tube buck-boost conversion unit 2 are input, output and parallel connected to obtain the bridgeless buck-boost PFC converter.
2. The three-switching tube buck-boost converter of claim 1, wherein the buck-boost converter unit outputs a bridgeless buck-boost PFC converter in parallel,
one end of the AC input side is provided with a rectifier diode D R2 Anode connection of (D) reflux diode D 3 The other end of the AC input side is connected with a rectifying diode D R1 Anode of (D) and reflux diode D 4 Is connected with the cathode of the battery;
rectifier diode D R2 Cathode of (2) and MOS tube S 2 Drain electrode connection of MOS tube S 2 The source electrode of (C) is respectively connected with the flywheel diode D 2 Cathode connection, inductance L 2 Is connected with one end of the connecting rod;
rectifier diode D R1 Cathode of (2) and MOS tube S 1 Drain electrode connection of MOS tube S 1 The source electrode of (C) is respectively connected with the flywheel diode D 1 Cathode, inductance L of (2) 1 Is connected with one end of the connecting rod;
inductance L 2 And the other end of (2) and inductance L 1 Is connected to the other end of the reflux diode D 3 Anode of (D) and reflux diode D 4 Anode, output capacitance C of (2) o One end of the anode and one end of the load are connected;
freewheel diode D 2 Anode of (D) and freewheeling diode D 1 Is connected with the anode of the output capacitor C o The other end of the load is connected with the negative electrode of the load.
3. The three-switching tube buck-boost converter of claim 2, wherein the buck-boost converter unit outputs a bridgeless buck-boost PFC converter in parallel,
MOS tube S in PFC converter topological structure 1 MOS tube S 2 Can be simultaneously turned on and off, and the MOS tube S 1 MOS tube S 2 Can be controlled with the same drive signal.
4. The three-switching tube buck-boost converter according to claim 3, wherein the three-switching tube buck-boost converter is a bridgeless buck-boost PFC converter,
the output voltage V of the PFC converter o Sampling signal and output reference voltage V o,ref Comparing, PI parameter adjustment to obtain error feedback signal, comparing the error feedback signal with triangular wave to generate output signal of comparator for directly driving MOS tube S 1 MOS tube S 2 。
5. The three-switching-tube buck-boost converter according to any one of claims 1-4, wherein the control method comprises:
working mode 1: MOS tube S 2 In a conducting state, the input end passes through the MOS tube S 2 Rectifier diode D R2 Reflux diode D 4 Inductance L 2 Charging, inductor current i L2 Linearly rising, MOS tube S 2 Is equal to the current of the inductor i L2 Is the same in magnitude and direction;
working mode 2: MOS (Metal oxide semiconductor)Tube S 2 Turn-off, freewheeling diode D 2 Conducting and storing in the inductor L 2 Is used for supplying energy to a load end, and the inductive current i L2 Linear decrease;
working mode 3: MOS tube S 2 In the off state, output capacitor C o Supplying power to the load;
working mode 4: MOS tube S 1 In a conducting state, the input end passes through the MOS tube S 1 Rectifier diode D R1 Reflux diode D 3 Inductance L 1 Charging, inductor current i L1 Linearly rising, MOS tube S 1 Is equal to the current of the inductor i L1 Is the same in magnitude and direction;
working mode 5: MOS tube S 1 Turn-off, freewheeling diode D 1 Conducting and storing in the inductor L 1 Is used for supplying energy to a load end, and the inductive current i L1 Linear decrease;
working mode 6: MOS tube S 1 In the off state, output capacitor C o To power the load.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224942A (en) * | 2021-06-16 | 2021-08-06 | 广东工业大学 | Non-isolated Buck-Boost bridgeless PFC converter system |
| CN116191862A (en) * | 2023-03-09 | 2023-05-30 | 西南交通大学 | Bridgeless buck PFC converter based on buck and flyback conversion unit |
| CN116722734A (en) * | 2023-03-07 | 2023-09-08 | 西南交通大学 | Bridgeless buck PFC converter based on buck-boost conversion unit |
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Patent Citations (3)
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|---|---|---|---|---|
| CN113224942A (en) * | 2021-06-16 | 2021-08-06 | 广东工业大学 | Non-isolated Buck-Boost bridgeless PFC converter system |
| CN116722734A (en) * | 2023-03-07 | 2023-09-08 | 西南交通大学 | Bridgeless buck PFC converter based on buck-boost conversion unit |
| CN116191862A (en) * | 2023-03-09 | 2023-05-30 | 西南交通大学 | Bridgeless buck PFC converter based on buck and flyback conversion unit |
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| Title |
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| ZHENGGE CHEN等: "Bridgeless PFC Topology Simplification and Design for Performance Benchmarking", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》, vol. 36, no. 5, 31 May 2021 (2021-05-31), pages 5398 - 5414, XP011833515, DOI: 10.1109/TPEL.2020.3028419 * |
| 胡广等: "二倍频功率解耦的升降压型无桥PFC 变换器", 《中国电机工程学报》, vol. 43, no. 9, 5 May 2023 (2023-05-05), pages 3507 - 3514 * |
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