CN108462384B - Three-phase buck PFC rectification circuit - Google Patents
Three-phase buck PFC rectification circuit Download PDFInfo
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- CN108462384B CN108462384B CN201810590608.2A CN201810590608A CN108462384B CN 108462384 B CN108462384 B CN 108462384B CN 201810590608 A CN201810590608 A CN 201810590608A CN 108462384 B CN108462384 B CN 108462384B
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- 238000012937 correction Methods 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 15
- 229920006926 PFC Polymers 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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Classifications
-
- 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
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
A buck PFC rectification circuit comprises a three-phase voltage source circuit; the three-phase uncontrolled rectifying circuit comprises three parallel series circuits, each series circuit comprises two diodes, and the three series circuits are respectively connected with a three-phase sinusoidal voltage source of the three-phase voltage source circuit; the input end of the three-phase active power factor correction topological circuit is connected with two parallel ends of the three-phase uncontrolled rectifying circuit; an active third harmonic current injection circuit. The power factor of the invention can reach 1.0, and the output voltage is controllable; a lower voltage can be output without a boost circuit; the three-phase decoupling is not needed, the control is simple, and the structure is simple and convenient to realize.
Description
Technical Field
The invention relates to the technical field of power factor correction, in particular to a buck PFC rectification circuit.
Background
The power factor correction technology (Power Factor Correction Technique) is a basic technology in the power electronics and industry fields, and is used for inhibiting harmonic pollution so as to reduce the damage of higher current harmonic waves to the power grid and various electric equipment. With the increase of electric equipment, requirements of high efficiency, high power density and high power factor are also put forward for the electric energy converter, so various novel PFC conversion topologies are generated.
At present, single-phase power factor correction technology is relatively more studied, and is quite mature in terms of circuit topology and control, while three-phase power factor correction is relatively less studied later. In recent years, as the research of PFC technology is continued, three-phase PFC is increasingly attracting attention.
The power factor correction technology is divided into two types, passive power factor correction and active power factor correction: passive power factor correction adopts passive devices, such as LC filtering, and has simple circuit structure and high efficiency, but the power factor is influenced by inductance values, can only reach 0.95 at most, and the output voltage is uncontrollable, so that the passive power factor correction is not adopted in most cases; the three-phase active power factor correction topological structure Boost circuit and the Buck-Boost circuit have the boosting function, so that the continuity of input current can be ensured when the input voltage changes in a very wide range, but the output voltage is still higher, and a step-down circuit is connected at the later stage in the occasion requiring lower rectified output voltage.
From the perspective of the number of active power transistors used, three-phase PFCs can be divided into two categories, one category being single-switch configurations and one category being multi-switch configurations. In order to realize decoupling among three phases, three inductors are arranged in an alternating current test mode and work in a current interruption mode, the three-phase single-switch Boost PFC circuit is characterized in that current control is simple, but input and output current ripples of the circuit are large, requirements on filtering current are high, output voltage is too high, certain difficulty is brought to selection of a power tube, and the circuit is generally applied to occasions with output power smaller than 10kw and non-strict requirements on current THD. Although the three-phase multi-switch can control input current with higher precision to obtain excellent performance, the driving and controlling strategies are complex, the cost is higher, and the three-phase multi-switch is suitable for occasions with higher power.
Disclosure of Invention
The invention aims to provide a three-phase buck PFC rectification circuit which is simple in structure and achieves the purpose of power factor correction by injecting third harmonic current.
A buck PFC rectifier circuit comprising:
The three-phase voltage source circuit consists of three sinusoidal voltage sources forming 120 degrees with each other, and one ends of the three sinusoidal voltage sources are connected together;
The three-phase uncontrolled rectifying circuit comprises three parallel series circuits, each series circuit comprises two diodes, the anode of one diode is connected with the cathode of the other diode, the cathodes of the three series circuits are connected with the cathodes to form a common cathode of the three-phase uncontrolled rectifying circuit, and the anodes of the three series circuits are connected with the anodes to form a common anode of the three-phase uncontrolled rectifying circuit; the three series circuits are respectively connected with three-phase sinusoidal voltage sources of the three-phase voltage source circuit, and the access point is positioned between two diodes of each series circuit;
An active third harmonic current injection circuit comprising a thyristor Q4, a thyristor Q5, a thyristor Q6, a thyristor Q7, a thyristor Q8, and a thyristor Q9; anodes of the thyristors Q4, Q5 and Q6 are respectively connected with a three-phase sinusoidal voltage source of a three-phase voltage source circuit, and cathodes of the thyristors Q4, Q5 and Q6 are mutually connected; cathodes of the thyristors Q7, Q8 and Q9 are respectively connected with a three-phase sinusoidal voltage source of the three-phase voltage source circuit, and anodes of the thyristors Q7, Q8 and Q9 are mutually connected;
The three-phase active power factor correction topological circuit is two buck circuits symmetrical about a diode D13 and a capacitor C1, wherein the first buck circuit comprises a power switch tube Q1, a power switch tube Q3, a diode D13, an inductor L1 and a capacitor C1, and the second buck circuit comprises a power switch tube Q2, a power switch tube Q3, a diode D13, an inductor L2 and a capacitor C1; the cathode of the diode D13 is connected with the cathodes of the thyristors Q4, Q5 and Q6, and the anode of the diode D13 is connected with the anodes of the thyristors Q7, Q8 and Q9; the collector of the power switch tube Q1 is connected with the common cathode of the three-phase uncontrolled rectifying circuit, the emitter of the power switch tube Q1 is connected with the cathode of the diode D13 and the collector of the power switch tube Q3, the emitter of the power switch tube Q3 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the capacitor C1, the emitter of the power switch tube Q2 is connected with the common anode of the three-phase uncontrolled rectifying circuit, the collector of the power switch tube Q2 is connected with the anode of the diode D13 and one end of the inductor L2, and the other end of the inductor L2 is connected with the negative electrode of the capacitor C1.
Further, the power switch tube Q1, the power switch tube Q2 and the power switch tube Q3 are MOSFETs or IGBTs.
The beneficial effects are that: compared with a three-phase LC filtering passive power factor correction circuit in the prior art, the power factor can reach 1.0, and the output voltage is controllable; compared with a three-phase boost-buck type PFC rectification circuit, the PFC rectification circuit outputs lower voltage under the condition of no boost circuit; compared with a three-phase single-switch correction circuit, the current control is simple, the inductive current works in a continuous mode, the input/output current ripple is small, only two inductors are needed, three-phase decoupling is not needed, and the control is simple; compared with a three-phase multi-switch power factor correction circuit, the driving and control strategy is simple, the cost is saved, and the implementation is convenient.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of a control loop of the present invention;
FIG. 3 is a three-phase current simulation effect diagram of the present invention;
FIG. 4 is a circuit operating state diagram for the present invention in operating state 1, i.e., phase A and phase C flow conditions (both Q1, Q2 are on);
FIG. 5 is a circuit operating state diagram for the present invention in operating state 2, i.e., phase A and phase B flow states (Q1 on, Q2 off);
FIG. 6 is a circuit operating state diagram for the present invention in operating state 3, i.e., phase B and phase C flow states (Q1 off, Q2 on);
fig. 7 is a circuit operating state diagram in the present invention operating state 4, i.e., freewheel state (Q1, Q2 are both off);
Fig. 8 is a circuit operation state diagram of the present invention at the time of operation state switching.
Detailed Description
The invention is described in detail below with reference to fig. 1-8, and elements and features described in one drawing or embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. It should be noted that the illustration and description of components and processes known to those skilled in the art, which are not relevant to the present invention, have been omitted in the drawings and description for the sake of clarity.
A buck PFC rectifier circuit comprising:
The three-phase voltage source circuit 1 consists of three sinusoidal voltage sources of which the angles of a, b and c are 120 degrees, and one ends of the three-phase voltage sources of a, b and c are connected together;
The three-phase uncontrolled rectifying circuit 2 comprises three parallel series circuits, each series circuit comprises two diodes, the anode of one diode is connected with the cathode of the other diode, the cathodes of the three series circuits are connected with the cathodes to form a common cathode of the three-phase uncontrolled rectifying circuit 2, and the anodes of the three series circuits are connected with the anodes to form a common anode of the three-phase uncontrolled rectifying circuit 2; the three series circuits are respectively connected with three-phase sinusoidal voltage sources of the three-phase voltage source circuit 1, and the access point is positioned between two diodes of each series circuit;
An active third harmonic current injection circuit 4, the active third harmonic current injection circuit 4 comprising a thyristor Q4, a thyristor Q5, a thyristor Q6, a thyristor Q7, a thyristor Q8 and a thyristor Q9; anodes of the thyristors Q4, Q5 and Q6 are respectively connected with a three-phase sinusoidal voltage source of the three-phase voltage source circuit 1, and cathodes of the thyristors Q4, Q5 and Q6 are mutually connected; the cathodes of the thyristors Q7, Q8 and Q9 are respectively connected with a three-phase sinusoidal voltage source of the three-phase voltage source circuit 1, and the anodes of the thyristors Q7, Q8 and Q9 are mutually connected;
The three-phase active power factor correction topological circuit 3 is two buck circuits symmetrical about the diode D13 and the capacitor C1, wherein the first buck circuit comprises a power switch tube Q1, the power switch tube Q3, the diode D13, an inductor L1 and the capacitor C1, and the second buck circuit comprises a power switch tube Q2, the power switch tube Q3, the diode D13, the inductor L2 and the capacitor C1; the cathode of the diode D13 is connected with the cathodes of the thyristors Q4, Q5 and Q6, and the anode of the diode D13 is connected with the anodes of the thyristors Q7, Q8 and Q9; the collector of the power switch tube Q1 is connected with the common cathode of the three-phase uncontrolled rectifying circuit 2, the emitter of the power switch tube Q1 is connected with the cathode of the diode D13 and the collector of the power switch tube Q3, the emitter of the power switch tube Q3 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the capacitor C1, the emitter of the power switch tube Q2 is connected with the common anode of the three-phase uncontrolled rectifying circuit 2, the collector of the power switch tube Q2 is connected with the anode of the diode D13 and one end of the inductor L2, and the other end of the inductor L2 is connected with the negative electrode of the capacitor C1.
In the present embodiment, the other end of the a-phase voltage source of the three-phase voltage source circuit 1 is connected to a point between D1 and D4 of the first series circuit, the other end of the b-phase voltage source is connected to a point between D2 and D5 of the second series circuit, and the other end of the c-phase voltage source is connected to a point between D3 and D6 of the third series circuit.
In other embodiments, since the three sinusoidal voltage sources of the three-phase voltage source circuit 1 and the three series circuits of the three-phase uncontrolled rectifying circuit are equivalent, the other end of the a-phase voltage source of the three-phase voltage source circuit 1 may also be connected to a point between D2 and D5 of the second series circuit or a point between D3 and D6 of the third series circuit.
In other embodiments, the three-phase active power factor correction topology 3 may be a Boost, buck-Boost, flyback, sepic, or Cuk circuit.
In this embodiment, the power switching transistor Q1, the power switching transistor Q2, and the power switching transistor Q3 are MOSFET devices. In other embodiments, power switch Q1, power switch Q2, and power switch Q3 may be IGBTs.
Referring to fig. 2, the three-phase input adopts two symmetrical three-phase half-wave rectification circuits, wherein the common-cathode pair neutral point voltage is a positive half-cycle envelope of the three-phase input voltage, and the common-anode pair neutral point voltage is a negative half-cycle envelope of the three-phase input voltage; the power tube currents of the two symmetrical buck circuits 2 are controlled to follow the positive half-cycle and negative half-cycle envelopes of the input voltage respectively.
The modulation of the active third harmonic current injection circuit 4 is low-frequency modulation which is phase-changed according to the input voltage of the rectifier, and finally, the three-phase current and the phase voltage keep the phase completely consistent, namely, the purpose of power factor correction is achieved.
Referring to fig. 3, a is a three-phase input a-phase voltage Ua and current ia, b is a three-phase input b-phase voltage Ub and current ib, and c is a three-phase input c-phase voltage Uc and current ic. From a, b and c, it can be seen that the three-phase current and the three-phase voltage keep the same phase, that is, the power factor correction is realized, and the simulation result shows that the PFC function can make the power factor reach 1.0.
Working principle:
The novel AC/DC converter introduces third harmonic current to reduce input current ripple. The modulation of the third harmonic current injection is low frequency modulated according to the input voltage. The third harmonic current is injected into only one of the three phases in the interval. The circuit can be divided into four working states according to the conducting state of the switching tube of the voltage reducing circuit in one pulse period. The four working states are that The switch state table in the section is shown in table 1:
table 1 on-off state table for each working state
| On state of Q1, Q2 | |
| Operating state 1 | Q1 and Q2 are all on |
| Operating state 2 | Q1 is on and Q2 is off |
| Operating state 3 | Q1 is off, Q2 is on |
| Operating state 4 | Q1 and Q2 are all off |
At the position ofInterval, u a＞ub＞uc.ub is at/>The interval is positive and negative, so thatDivided into two intervals, namely interval/>Sum interval/>In the intervalIn, the input voltage u b is less than 0; in section/>In, the input voltage u b > 0.
Working state 1: phase a and phase C are in fluid communication (Q1, Q2 are both on). The equivalent circuit is shown in FIG. 4, when the input phase voltage u b isIn the interval, the input source and the buck inductors L 1 and L 2 together provide energy for the load through D1, Q1, D6, Q3 and Q2 at the moment; conversely, when the input phase voltage u b is at/>In the interval, the input source and the buck inductors L 1 and L 2 together supply energy to the load via D1, Q1, D6, Q3, Q2.
Working state 2: phase a and phase B flow conditions (Q1 on, Q2 off). The equivalent circuit is shown in FIG. 5, when the input phase voltage u b isIn the interval, the input source and the buck inductors L 1 and L 2 together supply energy to the load via D1, Q3, Q8 at this point.
Working state 3: b-phase and C-phase flow conditions (Q1 off, Q2 on). The equivalent circuit is shown in FIG. 6, when the input phase voltage u b isDuring the interval, the input source and the buck inductors L 1 and L 2 together supply energy to the load via Q5, Q3, Q2, D6 at this point.
Working state 4: freewheel state (Q1, Q2 both off). The equivalent circuit is shown in FIG. 7, when the input phase voltage u b isIn the interval, the buck inductors L 1 and L 2 supply energy to the load together through Q3 and D13 at constant current I DC; conversely, when the input phase voltage u b is at/>In the interval, the load is also supplied with energy by the buck inductors L 1 and L 2 together with a constant current I DC via Q3, D13.
When the above-described operation state is switched, there is an operation state as shown in fig. 8 (Q3 off), and Q3 is turned off for the thyristor to be turned off to thereby turn off.
The foregoing description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the design of the present invention.
Claims (2)
1. A buck PFC rectifier circuit, comprising:
The three-phase voltage source circuit consists of three sinusoidal voltage sources forming 120 degrees with each other, and one ends of the three sinusoidal voltage sources are connected together;
The three-phase uncontrolled rectifying circuit comprises three parallel series circuits, each series circuit comprises two diodes, the anode of one diode is connected with the cathode of the other diode, the cathodes of the three series circuits are connected with the cathodes to form a common cathode of the three-phase uncontrolled rectifying circuit, and the anodes of the three series circuits are connected with the anodes to form a common anode of the three-phase uncontrolled rectifying circuit; the three series circuits are respectively connected with three-phase sinusoidal voltage sources of the three-phase voltage source circuit, and the access point is positioned between two diodes of each series circuit;
An active third harmonic current injection circuit comprising a thyristor Q4, a thyristor Q5, a thyristor Q6, a thyristor Q7, a thyristor Q8, and a thyristor Q9; anodes of the thyristors Q4, Q5 and Q6 are respectively connected with a three-phase sinusoidal voltage source of a three-phase voltage source circuit, and cathodes of the thyristors Q4, Q5 and Q6 are mutually connected; cathodes of the thyristors Q7, Q8 and Q9 are respectively connected with a three-phase sinusoidal voltage source of the three-phase voltage source circuit, and anodes of the thyristors Q7, Q8 and Q9 are mutually connected;
The three-phase active power factor correction topological circuit is two buck circuits symmetrical about a diode D13 and a capacitor C1, wherein the first buck circuit comprises a power switch tube Q1, a power switch tube Q3, a diode D13, an inductor L1 and a capacitor C1, and the second buck circuit comprises a power switch tube Q2, a power switch tube Q3, a diode D13, an inductor L2 and a capacitor C1; the cathode of the diode D13 is connected with the cathodes of the thyristors Q4, Q5 and Q6, and the anode of the diode D13 is connected with the anodes of the thyristors Q7, Q8 and Q9; the collector of the power switch tube Q1 is connected with the common cathode of the three-phase uncontrolled rectifying circuit, the emitter of the power switch tube Q1 is connected with the cathode of the diode D13 and the collector of the power switch tube Q3, the emitter of the power switch tube Q3 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the capacitor C1, the emitter of the power switch tube Q2 is connected with the common anode of the three-phase uncontrolled rectifying circuit, the collector of the power switch tube Q2 is connected with the anode of the diode D13 and one end of the inductor L2, and the other end of the inductor L2 is connected with the negative electrode of the capacitor C1.
2. The buck PFC rectifier circuit of claim 1, wherein: the power switch tube Q1, the power switch tube Q2 and the power switch tube Q3 are MOSFET or IGBT.
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| CN201810590608.2A CN108462384B (en) | 2018-06-09 | 2018-06-09 | Three-phase buck PFC rectification circuit |
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| CN201810590608.2A CN108462384B (en) | 2018-06-09 | 2018-06-09 | Three-phase buck PFC rectification circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471252A (en) * | 2016-01-05 | 2016-04-06 | 福州大学 | Harmonic-current injection type three-phase power factor correction circuit with high voltage-reduction transformation ratio |
| CN105553249A (en) * | 2016-01-05 | 2016-05-04 | 福州大学 | Current injection type three-phase power factor correction circuit having wide voltage range and low voltage stress |
| CN107888096A (en) * | 2017-12-25 | 2018-04-06 | 三峡大学 | A kind of bridge arm tri-level mixed-rectification device of three-phase two |
| CN108011513A (en) * | 2018-01-08 | 2018-05-08 | 湖南工业大学 | High-voltage high-speed generator step-down rectifier PFC system based on SWISS rectifiers |
| CN208337407U (en) * | 2018-06-09 | 2019-01-04 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuit |
-
2018
- 2018-06-09 CN CN201810590608.2A patent/CN108462384B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471252A (en) * | 2016-01-05 | 2016-04-06 | 福州大学 | Harmonic-current injection type three-phase power factor correction circuit with high voltage-reduction transformation ratio |
| CN105553249A (en) * | 2016-01-05 | 2016-05-04 | 福州大学 | Current injection type three-phase power factor correction circuit having wide voltage range and low voltage stress |
| CN107888096A (en) * | 2017-12-25 | 2018-04-06 | 三峡大学 | A kind of bridge arm tri-level mixed-rectification device of three-phase two |
| CN108011513A (en) * | 2018-01-08 | 2018-05-08 | 湖南工业大学 | High-voltage high-speed generator step-down rectifier PFC system based on SWISS rectifiers |
| CN208337407U (en) * | 2018-06-09 | 2019-01-04 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuit |
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| CN108462384A (en) | 2018-08-28 |
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