CN208337407U - A kind of three-phase step-down type PFC rectification circuit - Google Patents
A kind of three-phase step-down type PFC rectification circuit Download PDFInfo
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- CN208337407U CN208337407U CN201820889904.8U CN201820889904U CN208337407U CN 208337407 U CN208337407 U CN 208337407U CN 201820889904 U CN201820889904 U CN 201820889904U CN 208337407 U CN208337407 U CN 208337407U
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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
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Abstract
A kind of voltage-dropping type PFC rectification circuit, including three-phase voltage source circuit；Three-phase uncontrollable rectifier circuit, including three series circuits in parallel, every series circuit includes two diodes, and three series circuits and the three phase sine voltage source of three-phase voltage source circuit are separately connected；Three-phase active power factor corrects topological circuit, and input terminal connects the both ends in parallel of three-phase uncontrollable rectifier circuit；And active triple harmonic current injection circuit.The utility model power factor (PF) can reach 1.0, and output voltage is controllable；Lower voltage can be exported in the case where no booster circuit；It is not required to realize three-phase decoupling, control is simple, and structure is simply easy to implement.
Description
Technical field
The utility model relates to power factor correction technology field, especially a kind of voltage-dropping type PFC rectification circuit.
Background technique
Power factor correction technology (Power Factor Correction Technique) is power electronics educational circles and work
One basic technology in industry field is caused for inhibiting harmonic pollution with reducing high order current harmonics to power grid and each electrical equipment
Harm.With the increase of electrical equipment, high efficiency, high power density and High Power Factor also proposed to electrical energy transformer
It is required that therefore, various novel PFC transformation topologies also come into being.
Currently, the research of single-phase power factor correcting technology is relatively more, it is all quite mature in terms of circuit topology and control,
And the research of three-phase activity coefficient adjustment is then relatively late less.Research recently as PFC technology is constantly goed deep into, three-phase
PFC has attracted increasing attention.
Power factor correction technology is divided into passive power factor correction and two kinds of active power factor correction: Passive Power because
Number correction uses passive device, such as LC to filter, although circuit structure is simple, high-efficient, power factor is by inductance value
It influences, 0.95 only up to be reached, and output voltage is uncontrollable, so not being used in most cases；Three-phase active power because
Topological structure Boost, Buck-Boost circuit because of number correction has boost function, it is ensured that input voltage is very wide
Input current is continuous when range, but output voltage is still higher, for requiring the lower occasion of rectifier output voltage to need
Reduction voltage circuit is connected in rear class.
From the point of view of the quantity for using active power pipe, three-phase PFC can be divided into two classes, and one kind is single switch structure, Yi Leishi
Multi- Switch structure.Triphase single-switch Boost type pfc circuit, in order to realize the decoupling between three-phase, three inductance are placed on exchange
Survey, and work in discontinuous conduct mode, its main feature is that current control is simple, but the input of the circuit, output current ripple compared with
Greatly, more demanding to filtered circuit, output voltage is excessively high, this brings certain difficulty to the selection of power tube, the circuit one
As be applied to output power and be less than 10kw and not stringent occasion is required to electric current THD.Although three-phase Multi- Switch can be with higher
Precision controlling input current, obtain excellent performance, but drive and control strategy is complicated, higher cost is suitable for larger function
Rate occasion.
Summary of the invention
The purpose of this utility model is to provide a kind of three-phase step-down type PFC rectification circuits, and the circuit structure is simple, use
The mode of injection triple harmonic current realizes the purpose of PFC.
A kind of voltage-dropping type PFC rectification circuit, comprising:
Three-phase voltage source circuit, three sinusoidal voltage sources for being in 120 ° by three form, and the one of three sinusoidal voltage sources
End connects together；
Three-phase uncontrollable rectifier circuit, including three series circuits in parallel, every series circuit includes two diodes, and three
Series circuit and the three phase sine voltage source of three-phase voltage source circuit 1 are separately connected, and access point is located at every series circuit
Between two diodes；
Three-phase active power factor corrects topological circuit, and input terminal connects the both ends in parallel of three-phase uncontrollable rectifier circuit；With
And
Active triple harmonic current injection circuit, including thyristor and RCD circuit, input terminal i.e. three series circuit and three
The access point that the three phase sine voltage source of phase voltage source circuit 1 is separately connected.
Further, two one of diodes of diode on every series circuit of the three-phase uncontrollable rectifier circuit
Anode be connected with the cathode of another diode, three series circuit cathodes are connected with cathode, anode is connected with anode.
Further, the three-phase active power factor correction topological circuit is two symmetrical buck circuits.
The utility model has the advantages that power factor (PF) can compared with three-phase LC in the prior art filters Passive Power factor correction circuit
Reach 1.0, and output voltage is controllable；It is defeated in the case where no booster circuit compared with three-phase boost-buck type PFC rectification circuit
Lower voltage out；Compared with triphase single-switch correcting circuit, current control is simple, and inductive current works in continuous mode, input
Output current ripple is small, only needs two inductance, is not required to realize that three-phase decoupling, control are simple；With three-phase Multi- Switch power factor (PF) school
Positive circuit is compared, and driving and control strategy are simple, and save the cost is easy to implement.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model；
Fig. 2 is the control loop schematic diagram of the utility model；
Fig. 3 is the three-phase current simulated effect figure of the utility model；
Fig. 4 is the circuit work under utility model works state 1 i.e. A phase and C phase circulation status (Q1, Q2 are connected)
State diagram；
Fig. 5 is the circuit work under utility model works state 2 i.e. A phase and B phase circulation status (Q1 conducting, Q2 shutdown)
State diagram；
Fig. 6 is the circuit work under utility model works state 3 i.e. B phase and C phase circulation status (Q1 shutdown, Q2 conducting)
State diagram；
Fig. 7 is the circuit working state figure under utility model works state 4 i.e. freewheeling state (Q1, Q2 are turned off)；
Fig. 8 is circuit working state figure of the utility model in working condition switching.
Specific embodiment
1~8 pair of the utility model elaborates with reference to the accompanying drawing, in an attached drawing of the utility model or a kind of reality
Applying elements and features described in mode can be with element and spy shown in one or more other attached drawings or embodiment
Sign combines.It should be noted that for purposes of clarity, this field unrelated with the utility model is omitted in attached drawing and explanation
The expression and description of component and processing known to those of ordinary skill.
A kind of voltage-dropping type PFC rectification circuit, including
Three-phase voltage source circuit 1 is made of, a, b, c three-phase electricity three sinusoidal voltage sources that a, b, c tri- is in 120 °
One end of potential source connects together；
Three-phase uncontrollable rectifier circuit 2, including three series circuits in parallel, every series circuit includes two diodes,
Three series circuits and the three phase sine voltage source of three-phase voltage source circuit 1 are separately connected, and access point is located at every series circuit
Two diodes between；
Three-phase active power factor corrects topological circuit 3, and input terminal connects the both ends in parallel of three-phase uncontrollable rectifier circuit 2；
Active triple harmonic current injection circuit 4, including thyristor and RCD circuit, input terminal i.e. three series circuit with
The access point that the three phase sine voltage source of three-phase voltage source circuit 1 is separately connected.
With reference to attached drawing 1, three-phase voltage source circuit 1 is made of three sinusoidal voltage sources that a, b, c tri- is in 120 °, a,
B, c three-phase voltage source one end connects together, and the other end is connected with three-phase uncontrollable rectifier circuit 2 respectively.
Three-phase uncontrollable rectifier circuit 2 includes diode D1, D2, D3, D4, D5 and D6, and the anode of D1 is connected with the cathode of D4
First series circuit is constituted, the anode of D2 is connected with the cathode of D5 constitutes Article 2 series circuit, the anode of D3 and the yin of D6
Extremely it is connected and constitutes Article 3 series circuit.Above three series circuit cathodes are connected with cathode, anode is connected with anode.
In the present embodiment, the D1 of the other end and first series circuit in a phase voltage source of three-phase voltage source circuit 1 with
Being a little connected between D4, the other end in b phase voltage source being connected with any between the D2 of Article 2 series circuit and D5, c phase
Being a little connected between the other end of voltage source and the D3 of Article 3 series circuit and D6.
In other embodiments, due between three sinusoidal voltage sources of three-phase voltage source circuit 1 and three-phase do not control it is whole
It is equivalent between three series circuits of current circuit, so, the other end in a phase voltage source of three-phase voltage source circuit 1 can also
Being a little connected a little or between the D3 and D6 of Article 3 series circuit between the D2 of Article 2 series circuit and D5.
In the present embodiment, three-phase active power factor correction topological circuit 3 is preferably two symmetrical buck circuits,
One of buck circuit includes capacitor C1, power switch tube Q1 and Q3, diode D13, inductance L1；Second buck circuit
Including capacitor C1, power switch tube Q2 and Q3, diode D13, inductance L2, capacitor C1.The collector and three-phase uncontrollable rectifier of Q1
The common cathode of circuit 2 is connected, and the emitter of Q1 is connected with the collector of the cathode of D13 and Q3, and the emitter of Q3 is with inductance L1's
One end is connected, and the other end of inductance L1 is connected with capacitor C1 anode, the emitter of Q2 and the common-anode of three-phase uncontrollable rectifier circuit 2
It is connected, the collector of Q2 is connected with one end of the anode of D13 and L2, and the other end of L2 is connected with the cathode of C1.
In other embodiments, three-phase active power factor correction topological circuit 3 can for Boost, Buck-Boost,
Flyback, Sepic or Cuk circuit.
Active triple harmonic current injection circuit 4 includes thyristor Q4, Q5, Q6, Q7, Q8, Q9 and RCD circuit, RCD electricity
Road include resistance R1, R2, R3, R4, R5, R6, capacitor C2, C3, C4, C5, C6, C7, D7 and diode D8, D9, D10, D11,
D12.Wherein the anode of Q4 is connected with the midpoint of the cathode of C2 and first series circuit, the cathode of Q4, the cathode of D7 and R1
One end is connected with the cathode of D13, and the anode of Q5 is connected with the midpoint of the cathode of C3 and Article 2 series circuit, cathode, the D8 of Q5
Cathode be connected with the cathode of one end of R2 and D13, the anode of Q6 is connected with the midpoint of the cathode of C4 and Article 3 series circuit,
Cathode, the cathode of D9 of Q6 is connected with the cathode of one end of R3 and D13, the anode of Q7 and the cathode of C5 and first series electrical
The midpoint on road is connected, and cathode, the cathode of D10 of Q7 is connected with the anode of one end of R4 and D13, the anode of Q8 and the cathode of C6 and
The midpoint of Article 2 series circuit is connected, and cathode, the cathode of D11 of Q8 is connected with the anode of one end of R5 and D13, the anode of Q9
Be connected with the midpoint of the cathode of C7 and Article 3 series circuit, the cathode of Q8, one end of the cathode of D12 and R6 and D13 anode
It is connected.
In the present embodiment, power switch tube Q1、Q2、Q3For MOSFET element, Q4、Q5、 Q6、Q7、Q8、Q9It is thyristor.
In other embodiments, power switch tube Q1、Q2、Q3It can be IGBT.
With reference to attached drawing 2, three-phase input uses two symmetrical three-plase half wave rectifier circuits, common cathode voltage to neutral
For three-phase input voltage positive half cycle envelope, common-anode voltage to neutral is three-phase input voltage negative half period envelope；Control
The power tube current of two symmetrical buck circuits 2 follows input voltage positive half cycle and negative half period envelope respectively.
The modulation of active triple harmonic current injection circuit 4 is the low frequency modulations of commutation according to rectifier input voltage,
Final three-phase phase current keeps phase completely the same with phase voltage, that is, realizes the purpose of PFC.
With reference to attached drawing 3, a is three-phase input a phase voltage Ua and electric current ia, b are three-phase input b phase voltage Ub and electric current ib, c
For three-phase input c phase voltage Uc and electric current ic.It can be seen that three-phase current and three-phase phase voltage keep same-phase from a, b, c,
Realize PFC, simulation result shows that the PFC function can make power factor reach 1.0.
Working principle:
New A C/DC converter is to introduce triple harmonic current to reduce input current ripple.Triple harmonic current
The modulation of injection is to carry out low frequency modulations according to input voltage.Triple harmonic current section in only can be injected into three-phase
In any one phase.According on state of the reduction voltage circuit switching tube within a pulse period, circuit can be divided into four
Working condition.This four working conditions existSwitch state table in section is as shown in table 1:
| Q1, Q2 on state | |
| Working condition 1 | Q1, Q2 are connected |
| Working condition 2 | Q1 conducting, Q2 shutdown |
| Working condition 3 | Q1 shutdown, Q2 conducting |
| Working condition 4 | Q1, Q2 are turned off |
Each working condition switch state table of table 1
?Section, ua> ub> uc。ub?Have in section just have it is negative, can willIt is divided into two sections, i.e. sectionThe section andIn sectionIt is interior, input voltage ub< 0；In sectionIt is interior, input voltage ub> 0.
Working condition 1:A phase and C phase circulation status (Q1, Q2 are connected).Its equivalent circuit is as shown in Fig. 4, works as input
Phase voltage ub?When in section, input source and buck inductor L this moment1And L2Together through D1, Q1, D6, Q3, Q2
Energy is provided to load；Otherwise as input phase voltage ub?When in section, equally by input source and decompression
Inductance L1And L2Energy is provided to load through D1, Q1, D6, Q3, Q2 together.
Working condition 2:A phase and B phase circulation status (Q1 conducting, Q2 shutdown).Its equivalent circuit diagram is as shown in Fig. 5, when
Input phase voltage ub?When in section, input source and buck inductor L this moment1And L2Together through D1, Q1, Q3, Q8
Energy is provided to load.
Working condition 3:B phase and C phase circulation status (Q1 shutdown, Q2 conducting).Its equivalent circuit diagram is as shown in Fig. 6, when
Input phase voltage ub?When in section, input source and buck inductor L this moment1And L2Together through Q5, Q3, Q2,
D6 provides energy to load.
Working condition 4: freewheeling state (Q1, Q2 are turned off).Its equivalent circuit is as shown in Fig. 7, as input phase voltage ub
?When in section, buck inductor L this moment1And L2With constant current IDCEnergy is provided to load through Q3, D13 together
Amount, equivalent circuit diagram are as shown in Fig. 7；Otherwise as input phase voltage ub?When in section, equally by dropping
Voltage inductance L1And L2With constant current IDCEnergy is provided to load through Q3, D13 together.
When the switching of above-mentioned working condition, there is the working condition such as attached drawing 8 (Q3 shutdown), Q3 shutdown is for crystalline substance
Brake tube cutout is to realize its cut-off.
The above is only that the preferred embodiment of the utility model patent is described, not to the utility model
The range of patent is defined, under the premise of not departing from the utility model patent design spirit, those of ordinary skill in the art
To the various changes and improvements that the technical solution of the utility model patent is made, the utility model patent claim should all be fallen into
In the protection scope that book determines.
Claims (6)
1. a kind of voltage-dropping type PFC rectification circuit, characterized by comprising:
Three-phase voltage source circuit, three sinusoidal voltage sources for being in 120 ° by three form, and one end of three sinusoidal voltage sources connects
Together；
Three-phase uncontrollable rectifier circuit, including three series circuits in parallel, every series circuit includes two diodes, three strings
Connection circuit and the three phase sine voltage source of three-phase voltage source circuit are separately connected, and access point is located at two two of every series circuit
Between pole pipe；
Three-phase active power factor corrects topological circuit, and input terminal connects the both ends in parallel of three-phase uncontrollable rectifier circuit；And
Active triple harmonic current injection circuit, including thyristor and RCD circuit, input terminal i.e. three series circuit and three-phase electricity
The access point that the three phase sine voltage source of source circuit is separately connected.
2. voltage-dropping type PFC rectification circuit according to claim 1, it is characterised in that: the three-phase uncontrollable rectifier circuit is every
The anode of two one of diodes of diode on series circuit is connected with the cathode of another diode, and described three
Series circuit cathode is connected with cathode, anode is connected with anode.
3. voltage-dropping type PFC rectification circuit according to claim 1, it is characterised in that: the three-phase active power factor school
Positive topological circuit is two symmetrical buck circuits.
4. voltage-dropping type PFC rectification circuit according to claim 3, it is characterised in that: the buck circuit one of them
Buck circuit includes capacitor C1, power switch tube Q1 and Q3, diode D13, inductance L1；Second buck circuit includes capacitor
C1, power switch tube Q2 and Q3, diode D13, inductance L2, capacitor C1；The collector of Q1 is total to three-phase uncontrollable rectifier circuit 2
Cathode is connected, and the emitter of Q1 is connected with the collector of the cathode of D13 and Q3, and the emitter of Q3 is connected with one end of inductance L1,
The other end of inductance L1 is connected with capacitor C1 anode, and the emitter of Q2 is connected with the common-anode of three-phase uncontrollable rectifier circuit 2, Q2's
Collector is connected with one end of the anode of D13 and L2, and the other end of L2 is connected with the cathode of C1.
5. voltage-dropping type PFC rectification circuit according to claim 1, it is characterised in that: the active triple harmonic current note
Entering circuit includes thyristor Q4, Q5, Q6, Q7, Q8, Q9 and RCD circuit, the RCD circuit include resistance R1, R2, R3, R4, R5,
R6, capacitor C2, C3, C4, C5, C6, C7, D7 and diode D8, D9, D10, D11, D12；The wherein cathode of the anode of Q4 and C2
It is connected with the midpoint of first series circuit, cathode, the cathode of D7 of Q4 is connected with the cathode of one end of R1 and D13, the sun of Q5
Pole is connected with the midpoint of the cathode of C3 and Article 2 series circuit, the cathode of Q5, one end of the cathode of D8 and R2 and D13 cathode
It is connected, the anode of Q6 is connected with the midpoint of the cathode of C4 and Article 3 series circuit, one end of the cathode of Q6, the cathode of D9 and R3
It is connected with the cathode of D13, the anode of Q7 is connected with the midpoint of the cathode of C5 and first series circuit, the yin of the cathode of Q7, D10
Pole is connected with the anode of one end of R4 and D13, and the anode of Q8 is connected with the midpoint of the cathode of C6 and Article 2 series circuit, Q8's
Cathode, the cathode of D11 are connected with the anode of one end of R5 and D13, the anode of Q9 and the cathode of C7 and Article 3 series circuit
Midpoint is connected, and cathode, the cathode of D12 of Q8 is connected with the anode of one end of R6 and D13.
6. voltage-dropping type PFC rectification circuit according to claim 4, it is characterised in that: the power switch tube Q1、Q2、Q3For
MOSFET or IGBT, Q4、Q5、Q6、Q7、Q8、Q9For thyristor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820889904.8U CN208337407U (en) | 2018-06-09 | 2018-06-09 | A kind of three-phase step-down type PFC rectification circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820889904.8U CN208337407U (en) | 2018-06-09 | 2018-06-09 | A kind of three-phase step-down type PFC rectification circuit |
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| CN208337407U true CN208337407U (en) | 2019-01-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462384A (en) * | 2018-06-09 | 2018-08-28 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuits |
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- 2018-06-09 CN CN201820889904.8U patent/CN208337407U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108462384A (en) * | 2018-06-09 | 2018-08-28 | 南昌航空大学 | A kind of three-phase step-down type PFC rectification circuits |
| CN108462384B (en) * | 2018-06-09 | 2024-05-24 | 南昌航空大学 | Three-phase buck PFC rectification circuit |
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