CN105656296B - Sofe Switch auxiliary circuit, two-phase or three-phase input pfc circuit and control method - Google Patents
Sofe Switch auxiliary circuit, two-phase or three-phase input pfc circuit and control method Download PDFInfo
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- CN105656296B CN105656296B CN201410654481.8A CN201410654481A CN105656296B CN 105656296 B CN105656296 B CN 105656296B CN 201410654481 A CN201410654481 A CN 201410654481A CN 105656296 B CN105656296 B CN 105656296B
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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
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- 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
The present invention relates to a kind of Sofe Switch auxiliary circuits, comprising: auxiliary switch pipe, resonant inductance, the second diode and n first diode；Wherein n is the integer greater than 1；The Sofe Switch auxiliary circuit has first end to the n-th+2 end；The first end of the n first diode is connect with the first end of Sofe Switch auxiliary circuit to the n-th end respectively, the second end of the n first diode is commonly connected to the first end of resonant inductance, the second end of resonant inductance is connected to the (n+1)th end of Sofe Switch auxiliary circuit by the second diode, and the second end of resonant inductance also passes through auxiliary switch pipe and connect with the n-th+2 end of Sofe Switch auxiliary circuit.The present invention also provides a kind of two-phase input pfc circuit, three-phase input pfc circuit and its control method and uninterruptible power supplies.The present invention by sharing auxiliary switch pipe and resonant inductance, guarantee it is soft open effect while effectively save the quantity of auxiliary switch pipe and resonant inductance, reduce system complexity, improve reliability.
Description
Technical field
The present invention relates to field of circuit technology, input PFC more specifically to a kind of Sofe Switch auxiliary circuit, two-phase
Circuit, three-phase input pfc circuit and its control method and uninterruptible power supply.
Background technique
With the development of power electronics, system effectiveness increasingly becomes important index, soft to open in order to improve system effectiveness
Pass, quasi-resonance circuit etc. are constantly suggested, by vast power electronics practitioner research, development.Boost (boost) circuit
As a widely used circuit, many boost circuit soft switch circuit types are proposed, in recent years to reduce continuous mode
(CCM) diode reverse recovery bring is lost under.
As shown in Figure 1, for a kind of typical soft switch circuit in the prior art.Wherein, switching tube Q1 is main switch, is opened
Switching tube supplemented by the pipe Q2 of pass, inductance Lr1 are resonant inductance, and capacitor C1 is bus capacitor.Wherein resonant inductance Lr1, auxiliary switch pipe
Q2, diode D2 constitute Sofe Switch auxiliary circuit.Auxiliary switch pipe Q2 is first opened before opening main switch Q1, due to resonance
The presence of inductance Lr1 is slowly reduced by the electric current of diode D1, avoids reverse recovery loss.When pass through resonant inductance Lr1
Electric current when being equal to through the electric current of inductance L1, open main switch Q1, at this time since the electric current of inductance L1 cannot be mutated so that
Main switch Q1 realizes zero current turning-on.
But if Fig. 1 can be directly used if if it is single-phase circuit when the boost circuit is extended to pfc circuit
Mode, if it is quarter-phase circuit or the pfc circuit of three-phase input, it is necessary to multiple groups Sofe Switch auxiliary circuit.As shown in Figure 2
Two-phase input pfc circuit in, it includes that forward direction boost circuit is identical with structure therewith but electric current side which, which inputs pfc circuit,
To opposite negative sense boost circuit.Wherein forward direction boost circuit includes 2 main inductances such as inductance L1, L2, and 2 main switches are such as
Q11, Q12, bus capacitor C1,2 the 5th diode such as diode D51, D52 and 2 the 6th diode such as diode D61,
D62.A phase input terminal successively connects the first end of main switch Q11, main switch by concatenated inductance L1 with diode D51
The second end of Q11 and the cathode of bus capacitor C1 meet zero line side N；The first end of main switch Q11 also passes through diode D61 connection
The anode of bus capacitor C1.Wherein the first end of main switch Q11 is one end of electric current input, also known as current input terminal.It is main
The second end of switching tube Q11 is one end of electric current output, and can be described as current output terminal.Forward direction boost circuit further include by
The first Sofe Switch auxiliary circuit that auxiliary switch pipe Q21, resonant inductance Lr1 and diode D21 are constituted.Wherein resonant inductance Lr1
First end is connect with the current input terminal of main switch Q11, and the second end of resonant inductance Lr1 is connected to the of auxiliary switch pipe Q21
One end, and it is connected to by diode D21 the anode of bus capacitor.Equally, the circuit connecting relation of B phase input terminal phase therewith
It together, include inductance L2, diode D52, diode D62 and main switch Q12, and by auxiliary switch pipe Q22, resonant inductance Lr2
The the second Sofe Switch auxiliary circuit constituted with diode D22.Since negative sense boost circuit forms mirror image therewith, so that entire electricity
Switching tube used in road and resonant inductance quantity are multiplied.Two-phase input pfc circuit at least needs 4 auxiliary switch pipes such as
Q21-Q24 and 4 resonant inductance such as Lr1-Lr4.
Equally, also corresponding to increase due to increasing C phase input terminal in three-phase input pfc circuit as shown in Figure 3
Inductance L3, diode D53, diode D63 and main switch Q13 are added, and by auxiliary switch pipe Q23, resonant inductance Lr3 and two
The third Sofe Switch auxiliary circuit that pole pipe D23 is constituted.The three-phase input pfc circuit at least needs 6 auxiliary switch pipe such as Q21-
Q26 and 6 resonant inductance such as Lr1-Lr6.
As it can be seen that when boost circuit is applied to PFC (PFC) occasion, if corresponding soft in polyphase circuit
The quantity of switch auxiliary circuit will be consistent with the quantity of main switch.Due to the average current and function of Sofe Switch auxiliary circuit
Rate loss is all far below main switch, and the input pulse current requirements of auxiliary switch pipe require to be consistent with main switch,
Therefore the pipe that opens the light of capacity very little can not be selected, in addition quantity increases, circuit complexity and increased costs, reliability are reduced.
Summary of the invention
The technical problem to be solved in the present invention is that making for existing Sofe Switch auxiliary circuit when being applied to pfc circuit
The more defect for causing circuit complexity and higher cost of auxiliary switch pipe quantity provides a kind of shared the soft of auxiliary switch pipe and opens
Auxiliary circuit, two-phase input pfc circuit, three-phase input pfc circuit and its control method and uninterruptible power supply are closed, it can be effective
Component reduces system complexity, improves reliability.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of Sofe Switch auxiliary circuit, comprising: auxiliary
Switching tube, resonant inductance, the second diode and n first diode；Wherein n is the integer greater than 1；The Sofe Switch auxiliary electricity
Road has first end to the n-th+2 end；The first end of the n first diode respectively with the first end of Sofe Switch auxiliary circuit extremely
The connection of n-th end, the second end of the n first diode are commonly connected to the first end of the resonant inductance, the resonance electricity
The second end of sense is connected to the (n+1)th end of the Sofe Switch auxiliary circuit by second diode, the resonant inductance
Second end also passes through the auxiliary switch pipe and connect with the n-th+2 end of Sofe Switch auxiliary circuit.
In Sofe Switch auxiliary circuit according to the present invention, the Sofe Switch auxiliary circuit further include: n resonance electricity
Hold, n group third diode and the 4th diode；And the Sofe Switch auxiliary circuit also has the n-th+3 end to end 2n+2；It is described
Every group of third diode and the 4th diode series aiding connection are connected to afterwards together in n group third diode and the 4th diode
Between the second end of the resonant inductance and the (n+1)th end of the Sofe Switch auxiliary circuit；Third diode described in every group and
Node between four diodes is connected with the n-th+3 end to end 2n+2 of Sofe Switch auxiliary circuit respectively by a resonant capacitance
It connects.
The present invention also provides another Sofe Switch auxiliary circuits, comprising: auxiliary switch pipe, resonant inductance, n the one or two poles
Pipe, n resonant capacitance and n group third diode and the 4th diode；Wherein n is the integer greater than 1；The Sofe Switch auxiliary
Circuit has first end to the end 2n+2；
The first end of the n first diode is connect with the first end of Sofe Switch auxiliary circuit to the n-th end respectively, described
The second end of n first diode is commonly connected to the first end of the resonant inductance, and the second end of the resonant inductance passes through
The auxiliary switch pipe is connect with the n-th+2 end of Sofe Switch auxiliary circuit；
Every group of third diode and the 4th diode series aiding connection exist in the n group third diode and the 4th diode
It is connected to afterwards between the second end of the resonant inductance and the (n+1)th end of the Sofe Switch auxiliary circuit together；And described in every group
Node between third diode and the 4th diode by a resonant capacitance respectively with the n-th+3 end of Sofe Switch auxiliary circuit
It is connected to the end 2n+2.
The present invention also provides a kind of two-phases to input pfc circuit, including positive boost circuit and negative sense boost circuit；Institute
It states and all has a bus capacitor and two main switches in positive boost circuit and negative sense boost circuit；The forward direction
Boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit packet
It includes: an auxiliary switch pipe, a resonant inductance, second diode and two first diodes；
In the forward direction boost circuit: the current input terminal of each main switch passes through positive the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current output terminal of auxiliary switch pipe and main switch
Connection, and the second end of resonant inductance is connected to the anode of bus capacitor by the second positive diode；
In the negative sense boost circuit: the current output terminal of each main switch passes through reversed the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance is defeated by auxiliary switch pipe and the electric current of the main switch
Enter end connection, and the second end of resonant inductance is connected to the cathode of bus capacitor by the second reversed diode.
In two-phase according to the present invention input pfc circuit, the Sofe Switch auxiliary circuit further include: two resonance
Capacitor, two groups of third diodes and the 4th diode；
In the forward direction boost circuit: forward direction is connected to humorous after every group of third diode and the 4th diode series aiding connection
It shakes between the second end of inductance and the anode of bus capacitor；Every group of third diode and the 4th diode intermediate node are humorous by one
Vibration capacitor is respectively connected to the current input terminal of each main switch in positive boost circuit；
In the negative sense boost circuit: Opposite direction connection is humorous after every group of third diode and the 4th diode series aiding connection
It shakes between the second end of inductance and the cathode of bus capacitor；Every group of third diode and the 4th diode intermediate node are humorous by one
Vibration capacitor is respectively connected to the current output terminal of each main switch in negative sense boost circuit.
The present invention also provides another two-phases to input pfc circuit, including positive boost circuit and negative sense boost circuit；
A bus capacitor and two main switches are all had in the forward direction boost circuit and negative sense boost circuit；The forward direction
Boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit packet
Include: an auxiliary switch pipe, a resonant inductance, two first diodes, two resonant capacitances and two groups of third diodes and
4th diode；
In the forward direction boost circuit: the current input terminal of each main switch passes through positive the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current output terminal of auxiliary switch pipe and main switch
Connection；The positive second end for being connected to resonant inductance and bus electricity after every group of third diode and the 4th diode series aiding connection
Between the anode of appearance；Every group of third diode and the 4th diode intermediate node by a resonant capacitance be respectively connected to it is described just
The current input terminal of each main switch into boost circuit；
In the negative sense boost circuit: the current output terminal of each main switch passes through reversed the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current input terminal of auxiliary switch pipe and main switch
Connection；And second end and bus electricity of the Opposite direction connection in resonant inductance after every group of third diode and the 4th diode series aiding connection
Between the cathode of appearance；Every group of third diode and the 4th diode intermediate node are respectively connected to described negative by a resonant capacitance
The current output terminal of each main switch into boost circuit.
The present invention also provides a kind of three-phase input pfc circuits, including positive boost circuit and negative sense boost circuit；Institute
It states and all has a bus capacitor and three main switches in positive boost circuit and negative sense boost circuit；The forward direction
Boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit packet
It includes: an auxiliary switch pipe, a resonant inductance, second diode and three first diodes；
In the forward direction boost circuit: the current input terminal of each main switch passes through positive the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current output terminal of auxiliary switch pipe and main switch
Connection, and the second end of resonant inductance is connected to the anode of bus capacitor by the second positive diode；
In the negative sense boost circuit: the current output terminal of each main switch passes through reversed the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current input terminal of auxiliary switch pipe and main switch
Connection, and the second end of resonant inductance is connected to the cathode of bus capacitor by the second reversed diode.
In three-phase input pfc circuit according to the present invention, the Sofe Switch auxiliary circuit further include: three resonance
Capacitor, three groups of third diodes and the 4th diode；
In the forward direction boost circuit: forward direction is connected to humorous after every group of third diode and the 4th diode series aiding connection
It shakes between the second end of inductance and the anode of bus capacitor；Every group of third diode and the 4th diode intermediate node are humorous by one
Vibration capacitor is respectively connected to the current input terminal of each main switch in the forward direction boost circuit；
In the negative sense boost circuit: every group of third diode and the 4th diode series aiding connection together after reversely connect
It connects between the second end of resonant inductance and the cathode of bus capacitor；Every group of third diode and the 4th diode intermediate node pass through
One resonant capacitance is respectively connected to the current output terminal of each main switch in the negative sense boost circuit.
The present invention also provides another three-phase input pfc circuits, including positive boost circuit and negative sense boost circuit；
A bus capacitor and three main switches are all had in the forward direction boost circuit and negative sense boost circuit；The forward direction
Boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit packet
Include: an auxiliary switch pipe, a resonant inductance, three first diodes, three resonant capacitances and three groups of third diodes and
4th diode；
In the forward direction boost circuit: the current input terminal of each main switch passes through positive the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current output terminal of auxiliary switch pipe and main switch
Connection；The positive second end and bus capacitor for being connected to resonant inductance after every group of third diode and the 4th diode series aiding connection
Anode between；Every group of third diode and the 4th diode intermediate node are respectively connected to the forward direction by a resonant capacitance
The current input terminal of each main switch in boost circuit；
In the negative sense boost circuit: the current output terminal of each main switch passes through reversed the one or two respectively
Pole pipe is connected to the first end of resonant inductance, and the second end of resonant inductance passes through the current input terminal of auxiliary switch pipe and main switch
Connection；And second end and bus electricity of the Opposite direction connection in resonant inductance after every group of third diode and the 4th diode series aiding connection
Between the cathode of appearance；Every group of third diode and the 4th diode intermediate node are respectively connected to described negative by a resonant capacitance
The current output terminal of each main switch into boost circuit.
The present invention also provides another three-phase input pfc circuits, including positive boost circuit and negative sense boost circuit；
A bus capacitor and three main switches, the forward direction are all had in the forward direction boost circuit and negative sense boost circuit
The current input terminal of each main switch is connected to the main electricity of every phase by a 8th reversed diode in boost circuit
Sense；The current output terminal of each main switch is connected to every phase by a 8th positive diode in negative sense boost circuit
Main inductance；The forward direction boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；It is described
Sofe Switch auxiliary circuit includes: an auxiliary switch pipe, a resonant inductance, three first diodes, three resonant capacitances, and
Three groups of third diodes and the 4th diode；
In the forward direction boost circuit: the first end of resonant inductance passes through a reversed first diode connection respectively
To the anode of each 8th diode, the second end of resonant inductance is connected by the current output terminal of auxiliary switch pipe and main switch
It connects；The positive second end for being connected to resonant inductance and bus capacitor after every group of third diode and the 4th diode series aiding connection
Between anode；Every group of third diode and the 4th diode intermediate node are respectively connected to the forward direction by a resonant capacitance
The current input terminal of each main switch in boost circuit；
In the negative sense boost circuit: the first end of resonant inductance passes through a positive first diode connection respectively
To the anode of each 8th diode, the second end of resonant inductance is connected by the current input terminal of auxiliary switch pipe and main switch
It connects；And second end and bus capacitor of the Opposite direction connection in resonant inductance after every group of third diode and the 4th diode series aiding connection
Cathode between；Every group of third diode and the 4th diode intermediate node are respectively connected to the negative sense by a resonant capacitance
The current output terminal of each main switch in boost circuit.The present invention also provides a kind of circuit control methods, are suitable for as before
The two-phase inputs pfc circuit or three-phase input pfc circuit, and the control signal of each main switch rises in the circuit
Along alignment, and before the unlatching of each main switch, the first preset time opens each auxiliary switch pipe, in each main switch
Second preset time after unlatching closes each auxiliary switch pipe.
In circuit control method according to the present invention, first preset time meets following formula:
t1≥I×Lr/U；
Wherein, U is the busbar voltage of the bus capacitor, and I is the input peak point current of circuit, and Lr is the resonant inductance
Inductance sensibility reciprocal.
The present invention also provides a kind of uninterruptible power supply, including foregoing Sofe Switch auxiliary circuit or two-phase it is defeated
Enter pfc circuit or three-phase input pfc circuit.
Implement Sofe Switch auxiliary circuit of the invention, two-phase input pfc circuit, three-phase input pfc circuit and its controlling party
Method and uninterruptible power supply, have the advantages that the present invention by sharing auxiliary switch pipe and resonant inductance, guarantee it is soft open-minded
The quantity of auxiliary switch pipe and resonant inductance is effectively saved while effect, reduces system complexity, improves reliability.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is a kind of typical soft switch circuit in the prior art；
Fig. 2 is that a kind of typical two-phase inputs pfc circuit in the prior art；
Fig. 3 is a kind of typical three-phase input pfc circuit in the prior art；
Fig. 4 A-4B is the first embodiment of Sofe Switch auxiliary circuit according to the present invention and the circuit diagram of second embodiment；
Fig. 5 A-5B is the 3rd embodiment of Sofe Switch auxiliary circuit according to the present invention and the circuit diagram of fourth embodiment；
Fig. 6 is the circuit diagram for the first embodiment that two-phase according to the present invention inputs pfc circuit；
Fig. 7 is the circuit diagram of the first embodiment of three-phase input pfc circuit according to the present invention；
Fig. 8 A-8B is the circuit diagram of the 5th embodiment and sixth embodiment of Sofe Switch auxiliary circuit according to the present invention；
Fig. 9 A-9B is the circuit diagram of the 7th embodiment and the 8th embodiment of Sofe Switch auxiliary circuit according to the present invention；
Figure 10 is the circuit diagram of the second embodiment of three-phase input pfc circuit according to the present invention；
Figure 11 is the circuit diagram of the 3rd embodiment of three-phase input pfc circuit according to the present invention；
Figure 12 is the control sequential figure of three-phase input pfc circuit according to the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.
The present invention provides a kind of Sofe Switch auxiliary circuits comprising: auxiliary switch pipe, resonant inductance, the second diode and n
A first diode；Wherein n is the integer greater than 1.The Sofe Switch auxiliary circuit has first end to the n-th+2 end.Wherein, n
The first end of first diode is connect with the first end of Sofe Switch auxiliary circuit to the n-th end respectively, and the second of n first diode
End is commonly connected to the first end of resonant inductance, and the second end of resonant inductance is connected to Sofe Switch auxiliary electricity by the second diode
(n+1)th end on road, the second end of resonant inductance also pass through auxiliary switch pipe and connect with the n-th+2 end of Sofe Switch auxiliary circuit.
The Sofe Switch auxiliary circuit can be typically used in n phase and input pfc circuit.It includes forward direction that the n phase, which inputs pfc circuit,
The negative sense boost circuit that boost circuit is identical with structure therewith but current direction is opposite.Forward direction boost circuit includes one
Bus capacitor and n group main inductance, main switch, the 5th diode and the 6th diode.The 1-n phase of positive boost circuit is defeated
Enter the current input terminal that end connects respective main switch by the main inductance being respectively sequentially connected in series and the 5th diode respectively, it is main
The current input terminal of switching tube also connects the anode of bus capacitor, and the electricity of n main switch by respective 6th diode
The cathode of stream output end and bus capacitor is connected to zero line side.Forward direction boost circuit and negative sense boost circuit can be into
One step includes a Sofe Switch auxiliary circuit above-mentioned, wherein the first end of Sofe Switch auxiliary circuit is extremely in positive boost circuit
N-th end is respectively connected to the current input terminal of n main switch, and the (n+1)th end of Sofe Switch auxiliary circuit is connected to bus capacitor
Anode, the n-th+2 end of Sofe Switch auxiliary circuit is connected to zero line side.In negative sense boost circuit Sofe Switch auxiliary circuit with just
Into boost circuit, the structure of Sofe Switch auxiliary circuit is identical but current direction is opposite.The electric current of main switch in the present invention
Input terminal refers to that electric current inputs one end of main switch in normal work other than control terminal.The electric current of main switch exports
End refers to that electric current flows out one end of main switch in normal work other than control terminal.
It as shown in Figure 4 A, is the circuit diagram of the first embodiment of Sofe Switch auxiliary circuit according to the present invention.First reality
It applies in example, n 2, typically can be applied in the positive boost circuit of two-phase input pfc circuit.As shown in Figure 4 A, this soft is opened
Closing auxiliary circuit includes auxiliary switch pipe Q21 and resonant inductance Lr1 and second diode such as diode D21 and 2 the
One diode such as diode D11 and diode D12.The first end of the Sofe Switch auxiliary circuit is the end A1, and second end is the end B1, the
Three ends are the end BUS+, and the 4th end is zero line side, that is, N-terminal.Specific connection relationship is as shown, diode D11 and diode D12
First end such as anode is connect with the end A1 of Sofe Switch auxiliary circuit and the end B1 respectively, the second end of diode D11 and diode D12
If cathode is commonly connected to the first end of resonant inductance Lr1, the second end of resonant inductance Lr1 is connected by positive diode D21
It is connected to the end BUS+, the second end of resonant inductance Lr1 also passes through auxiliary switch pipe Q21 and connect with N-terminal.
It as shown in Figure 4 B, is the circuit diagram of the second embodiment of Sofe Switch auxiliary circuit according to the present invention.Second reality
It applies in example, n 2, typically can be applied in the negative sense boost circuit of two-phase input pfc circuit.As shown in Figure 4 B, this soft is opened
Closing auxiliary circuit includes auxiliary switch pipe Q24 and resonant inductance Lr4 and second diode such as diode D24 and 2 the
One diode, such as diode D14 and diode D15.The first end of the Sofe Switch auxiliary circuit is the end A2, and second end is the end B2,
Third end is the end BUS-, and the 4th end is N-terminal.Specific connection relationship as shown, diode D14 and diode D15 first end
If cathode is connect with the end A2 of Sofe Switch auxiliary circuit and the end B2 respectively, the second end of diode D14 and diode D15 such as anode
It is commonly connected to the first end of resonant inductance Lr4, the second end of resonant inductance Lr4 is connected to by reversed diode D24
The end BUS-, the second end of resonant inductance Lr4 also pass through auxiliary switch pipe Q24 and connect with N-terminal.
It as shown in Figure 5A, is the circuit diagram of the 3rd embodiment of Sofe Switch auxiliary circuit according to the present invention.The third is real
It applies in example, n 3, typically can be applied in the positive boost circuit of three-phase input pfc circuit.As shown in Figure 5A, this soft is opened
Closing auxiliary circuit includes auxiliary switch pipe Q21 and resonant inductance Lr1 and second diode, and such as diode D21 and 3 the
One diode, such as diode D11-D13.The first end of the Sofe Switch auxiliary circuit is the end A1, and second end is the end B1, and third end is
The end C1, the 4th end are the end BUS+, and the 5th end is zero line side, that is, N-terminal.
It as shown in Figure 5 B, is the circuit diagram of the fourth embodiment of Sofe Switch auxiliary circuit according to the present invention.4th is real
It applies in example, n 3, typically can be applied in the negative sense boost circuit of three-phase input pfc circuit.As shown in Figure 5 B, this soft is opened
Closing auxiliary circuit includes auxiliary switch pipe Q24 and resonant inductance Lr4 and second diode such as diode D24 and 3 the
One diode, such as diode D14-D16.The first end of the Sofe Switch auxiliary circuit is the end A2, and second end is the end B2, and second end is
The end C2, the 4th end are the end BUS-, and the 5th end is N-terminal.
As shown in fig. 6, inputting the circuit diagram of the first embodiment of pfc circuit for two-phase according to the present invention.Such as Fig. 6 institute
Show, which inputs pfc circuit, including the positive boost circuit negative sense boost identical but opposite current direction with structure therewith
Circuit.Forward direction boost circuit includes a bus capacitor and two groups of main inductances, main switch, the 5th diode and the 6th
Diode.The A phase input terminal and B phase input terminal of positive boost circuit pass through the main inductance being respectively sequentially connected in series and the 5th respectively
Switching tube connects the current input terminal of respective main switch, and the current input terminal of main switch also passes through respective six or two pole
Pipe connects the anode of bus capacitor, and the current output terminal of two groups of main switches and the cathode of bus capacitor are connected to zero curve
End.Specifically, forward direction boost circuit includes bus capacitor C1 and 2 main inductances such as inductance L1, L2,2 main switches
Such as Q11, Q12,2 the 5th diode such as diode D51, D52 and 2 the 6th diode such as diode D61, D62.This is just
It further include Sofe Switch auxiliary circuit as shown in Figure 4 A to boost circuit, such as with bus capacitor C1 and 2 main switches
Q11, Q12 connection.Wherein in Fig. 4 A the end A1 connection main switch Q11 current input terminal, the end B1 connect main switch Q12 electricity
Input terminal is flowed, the end BUS+ then connects the anode of bus capacitor C1.Negative sense boost circuit then includes soft shown in Fig. 4 B opens in Fig. 6
Close auxiliary circuit.Wherein in Fig. 4 B the end A2 connection main switch Q14 current output terminal, the end B2 connect main switch Q14 electricity
Output end is flowed, the end BUS- then connects the cathode of bus capacitor C2.Sofe Switch auxiliary circuit and forward direction in negative sense boost circuit
The structure of Sofe Switch auxiliary circuit is identical in boost circuit but current direction is opposite.
As shown in fig. 6, realizing single auxiliary switch pipe using Sofe Switch auxiliary circuit shown in Fig. 4 A or 4B while to two
The soft effect opened of a main switch, and only need a resonant inductance.
As shown in fig. 7, the circuit diagram of the first embodiment for three-phase input pfc circuit according to the present invention.Such as Fig. 7 institute
Show, the three-phase input pfc circuit, including the positive boost circuit negative sense boost identical but opposite current direction with structure therewith
Circuit.Forward direction boost circuit includes a bus capacitor and three groups of main inductances, main switch, the 5th diode and the 6th
Diode.A phase input terminal, B phase input terminal and the C phase input terminal of positive boost circuit pass through the master being respectively sequentially connected in series respectively
Inductance and the 5th switching tube connect the current input terminal of respective main switch, and the current input terminal of main switch also passes through respectively
The 6th diode connection bus capacitor anode, and the current output terminal of two groups of main switches and the cathode of bus capacitor connect
It is connected to zero line side.Specifically, forward direction boost circuit includes bus capacitor C1 and 3 main inductances such as inductance L1-L3, and 3
Main switch such as Q11-13,3 the 5th diode such as diode D51-D53 and 3 the 6th diode such as diode D61-
D63.Forward direction boost circuit further includes Sofe Switch auxiliary circuit as shown in Figure 5 A, is opened with bus capacitor C1 and 3 masters
Guan Guanru Q11-Q13 connection.Wherein in Fig. 5 A the end A1 connection main switch Q11 current input terminal, the end B1 connect main switch
The current input terminal of Q12, the end C1 connect the current input terminal of main switch Q13, and the end BUS+ then connects the anode of bus capacitor C1.
Negative sense boost circuit then includes Sofe Switch auxiliary circuit shown in Fig. 5 B in Fig. 6.Wherein the end A2 connects main switch in Fig. 5 B
The current output terminal of Q14, the end B2 connect the current output terminal of main switch Q14, and the end C2 connects the electric current output of main switch Q16
End, the end BUS- then connects the cathode of bus capacitor C2.Sofe Switch auxiliary circuit is then electric with positive boost in negative sense boost circuit
The structure of Sofe Switch auxiliary circuit is identical in road but current direction is opposite.
Sofe Switch principle of the invention is illustrated by taking positive boost as an example.Assuming that A phase and B phase are in positive half cycle, C phase
In negative half period state, switching tube Q21 is first opened, continues the t1 moment, switching tube Q11 and Q12 is then turned on, due to resonant inductance
The presence of Lr1, di/dt are controlled, and the reverse recovery current very little of diode D51 and D52 reduce the open-minded of main switch
The reverse recovery loss of loss and diode.As shown in fig. 7, realizing list using Sofe Switch auxiliary circuit shown in Fig. 5 A or 5B
A auxiliary switch pipe gives three main switches the soft effect opened simultaneously, and only needs a resonant inductance.
Sofe Switch auxiliary circuit of the invention can also increase the soft pass that resonant capacitance realizes main switch and auxiliary switch pipe
Disconnected effect, also needs to increase diode-isolated thus, multiple resonant capacitances is avoided to be directly connected to.Therefore, of the invention another
In preferred embodiment, Sofe Switch auxiliary circuit of the invention further include: N number of resonant capacitance, N group third diode and the four or two pole
Pipe；And Sofe Switch auxiliary circuit also has the end N+3 to the end 2N+2.Every group in N group third diode and the 4th diode
Third diode and the 4th diode series aiding connection are connected to the second end and Sofe Switch auxiliary circuit of resonant inductance afterwards together
The end N+1 between；Node between every group of third diode and the 4th diode is opened with soft respectively by a resonant capacitance
Close the end N+3 to the end the 2N+2 connection of auxiliary circuit.In the preferred embodiment, when increasing N number of resonant capacitance, N group
After three diodes and the 4th diode, the second diode becomes optional device.
It as shown in Figure 8 A, is the circuit diagram of the 5th embodiment of Sofe Switch auxiliary circuit according to the present invention.Such as Fig. 8 A institute
Show, which increases 2 resonant capacitances i.e. Cr1, Cr2 on the basis of Fig. 4 A, 2 third diode, that is, diode D31,
D32,2 four diodes, that is, diode D41, D42.The second diode such as diode D21 becomes optional diode in Fig. 4 A.
The Sofe Switch auxiliary circuit also has the 5th end and the 6th end, the respectively end A3 and the end B3.Pfc circuit is inputted in two-phase when applying
Positive boost circuit in when, the end A3 and the end B3 and main switch direct-coupling.
It as shown in Figure 8 B, is the circuit diagram of the sixth embodiment of Sofe Switch auxiliary circuit according to the present invention.Such as Fig. 8 B institute
Show, which increases 2 resonant capacitances i.e. Cr4, Cr5 on the basis of Fig. 4 B, 2 third diode, that is, diode D34,
D35,2 four diodes, that is, diode D44, D45.The second diode such as diode D24 becomes optional diode in Fig. 4 B.
The Sofe Switch auxiliary circuit also has the 5th end and the 6th end, the respectively end A4 and the end B4.Pfc circuit is inputted in two-phase when applying
Negative sense boost circuit in when, the end A4 and the end B4 and main switch direct-coupling.The present invention further correspondingly provide containing Fig. 8 A and
The two-phase of the Sofe Switch auxiliary circuit of Fig. 8 B inputs pfc circuit, which inputs in the positive boost circuit of pfc circuit, the end A3
The current input terminal of two main switches such as switching tube Q11 and Q12 can be respectively connected to the end B3, which inputs pfc circuit
Negative sense boost circuit in, the electric current that the end A4 and the end B4 can be respectively connected to two main switch such as switching tube Q14 and Q15 is defeated
Outlet.
It as shown in Figure 9 A, is the circuit diagram of the 7th embodiment of Sofe Switch auxiliary circuit according to the present invention.Such as Fig. 9 A institute
Show, which increases the i.e. Cr1-Cr3 of 3 resonant capacitances, 3 third diode, that is, diode D31- on the basis of Fig. 5 A
D33,3 four diodes, that is, diode D41-D43.The second diode such as diode D21 becomes optional diode in Fig. 5 A.
The Sofe Switch auxiliary circuit also has the 6th end to the 8th end, the respectively end A3, the end B3 and the end C3.When applying in three-phase input
When in the positive boost circuit of pfc circuit, the end A3, the end B3 and the end C3 respectively with main switch direct-coupling.Correspondingly, this hair
It is bright to additionally provide a kind of Sofe Switch auxiliary circuit, it is identical as the circuit structure in Fig. 9 A but current direction is opposite.The present invention also phase
The three-phase containing Sofe Switch auxiliary circuit and the circuit identical but opposite current direction with its structure in Fig. 9 A should be provided
Pfc circuit is inputted, in positive boost circuit, the end A3, the end B3 and the end C3 can be respectively connected to three main switch such as switching tubes
The current input terminal of Q11, Q12 and Q13, in the Sofe Switch auxiliary circuit of negative sense boost circuit, with the end A3, the end B3 and the end C3
The port for forming mirror image can be respectively connected to the current output terminal of three main switches such as switching tube Q14, Q15 and Q16.
It as shown in Figure 9 B, is the circuit diagram of the 8th embodiment of Sofe Switch auxiliary circuit according to the present invention.Such as Fig. 9 B institute
Show, which increases the second end and bus capacitor C1 that a forward direction is connected to resonant inductance Lr1 on the basis of Fig. 9 A
Between the second diode such as diode D24.The purpose is to improve to pass in high current by the electric current of resonant inductance Lr1
It is delivered to the efficiency of bus, i.e., is transformed to an independent diode from two Diode series.Correspondingly, present invention provides
A kind of three-phase input pfc circuit, but current direction identical including structure opposite positive boost circuit and negative sense boost circuit,
In its forward direction boost circuit include Fig. 9 B shown in Sofe Switch auxiliary circuit, and include in negative sense boost circuit with shown in Fig. 9 B
Sofe Switch auxiliary circuit structure is identical but Sofe Switch auxiliary circuit that current direction is opposite.
Referring to Fig. 10, the circuit diagram of the second embodiment for three-phase input pfc circuit according to the present invention.Such as Figure 10 institute
Show, the three-phase input pfc circuit of the embodiment is there are bridge PFC circuits.In the positive boost circuit of the three-phase input pfc circuit
Sofe Switch auxiliary circuit shown in Fig. 9 A is utilized, is connect with bus capacitor C1 and 3 main switch such as Q11-Q13.Its
The end A1 and the end A3 are all connected with the current input terminal of main switch Q11 in middle Fig. 9 A, and the end B1 and the end B3 are all connected with main switch Q12's
Current input terminal, the end C1 and the end C3 are all connected with the current input terminal of main switch Q13, and the end BUS+ is then connecting bus capacitor C1 just
Pole.Resonant capacitance Cr1-Cr3 is used to guarantee the soft switching effect of auxiliary switch and main switch.Equally, three-phase input PFC
Electricity also is assisted comprising the Sofe Switch in a Sofe Switch auxiliary circuit, with positive boost circuit in the negative sense boost circuit of circuit
The structure on road is identical but current direction is opposite.
Sofe Switch principle of the invention is illustrated by taking positive boost as an example.Assuming that A phase and B phase are in positive half cycle, C phase
In negative half period state, switching tube Q21 is first opened, continues the t1 moment, switching tube Q11 and Q12 is then turned on, due to resonant inductance
The presence of Lr1, di/dt are controlled, and the reverse recovery current very little of diode D51 and D52 reduce the open-minded of main switch
The reverse recovery loss of loss and diode.After switching tube Q11 and Q12 open a period of time t2 period, pipe is turned off the switch
Energy on Q21, resonant inductance Lr1 is stored to resonant capacitance Cr1 and Cr2.Since resonant capacitance one end is connected with main switch,
Main switch is opened this moment, thus one end of resonant capacitance by clamped in zero curve current potential.If resonant inductance and resonant capacitance
It selects proper, the voltage of resonant capacitance can be charged to equal with busbar voltage.When each main switch Q11 and Q12 turns off moment, quilt
Resonant capacitance and D41 and D42 are clamped by bus, and shutdown voltage is started from scratch rising, realize the soft switching of main switch.
Figure 11 is please referred to, is the circuit diagram of the 3rd embodiment of three-phase input pfc circuit according to the present invention.Such as Figure 11 institute
Show, the three-phase input pfc circuit of the embodiment is non-bridge PFC circuits.The three-phase input pfc circuit includes forward direction boost circuit
The negative sense boost circuit that structure is identical therewith but current direction is opposite.Forward direction boost circuit include bus capacitor with
And three groups of main inductances, main switch, the 7th diode and the 8th diode.The A phase input terminal of positive boost circuit, B phase input
End passes through the main inductance being respectively sequentially connected in series respectively with C phase input terminal and the 8th switching tube connects the electric current of respective main switch
Input terminal, the node between main inductance and the 8th switching tube also connect the anode of bus capacitor by respective 7th diode,
And the current output terminal of two groups of main switches and the cathode of bus capacitor are connected to zero line side.Specifically, forward direction boost electricity
Road includes bus capacitor C1 and 3 main inductances such as inductance L1-L3,3 main switches such as switching tube Q11-Q13, and 3 the 7th
Diode such as diode D71-D73 and 3 the 8th diode such as diode D81-D83.The three-phase input pfc circuit is just
Sofe Switch auxiliary circuit shown in Fig. 9 A is utilized into boost circuit, such as with bus capacitor C1 and 3 main switches
Q11-Q13 connection.Wherein the end A1, B1 and C1 is respectively connected to the anode of the 8th diode such as diode D81-D83 in Fig. 9 A,
The end A3, B3 and C3 is separately connected the current input terminal of main switch such as switching tube Q11-Q13, and the end BUS+ then connects bus capacitor C1
Anode.Resonant capacitance Cr1-Cr3 is used to guarantee the soft switching effect of auxiliary switch and main switch.Equally, the three-phase is defeated
Enter in the negative sense boost circuit of pfc circuit and also includes a Sofe Switch auxiliary circuit, and it is soft in positive boost circuit
Switch auxiliary circuit structure is identical but current direction is opposite.
The present invention also provides the control methods of aforementioned two-phase input pfc circuit or three-phase input pfc circuit, i.e. circuit
In the control signal rising edge of each main switch to it, and before the unlatching of each main switch, the first preset time t 1 is opened
Each auxiliary switch pipe is opened, the second preset time t 2 after the unlatching of each main switch closes each auxiliary switch pipe.Below with Fig. 7
Three-phase input pfc circuit for be illustrated.It is as shown in figure 12 the control sequential of three-phase input pfc circuit of the invention
Figure.As figure sequential control method in, for the rising edge of each main switch such as Q11-Q13 to it, failing edge is automatic according to system
Control gained, and opening for auxiliary switch pipe such as Q21 needs the t1 period in advance.When i.e. first unlatching auxiliary switch pipe such as Q21 continues t1
Between, each main switch such as Q11-Q13 is opened afterwards, closes auxiliary switch pipe Q21 after unlatching after the t2 period.
Wherein the first preset time t 1 meets following formula: t1 >=I × Lr/U；
Wherein, U is the busbar voltage of bus capacitor, and I is the input peak point current of circuit, and Lr is the inductance sense of resonant inductance
Amount.
As long as closing auxiliary switch pipe after each main switch is all opened, therefore the value of the second preset time t 2 can
With smaller, in order to guarantee effect, t2 value is to be less than 5us greater than 100ns under normal circumstances.Certain switching frequency is higher, the
The time of two preset time ts 2 is shorter.
The present invention also provides a kind of uninterruptible power supply (UPS) comprising foregoing Sofe Switch auxiliary circuit or
Two-phase inputs pfc circuit or three-phase input pfc circuit.
Although Sofe Switch auxiliary circuit provided by the invention is particularly suitable for selecting by the quantity of diode, carry out multiple
Sharing for the Sofe Switch auxiliary circuit of boost circuit, is also suitable for applying in pfc circuit occasion；But the invention is not restricted to this, this
Field basic technology personnel can according to need Sofe Switch auxiliary circuit application on various occasions to save component number
Circuit, which should all fall within the scope of protection of the present invention.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that not departing from this hair
When bright range, various change and equivalent replacement can be carried out.In addition, to adapt to the specific occasion of the technology of the present invention or material, it can be right
The present invention carries out many modifications without departing from its protection scope.Therefore, the present invention is not limited to specific embodiment disclosed herein,
And including all embodiments for dropping into claims.
Claims (7)
1. a kind of Sofe Switch auxiliary circuit characterized by comprising auxiliary switch pipe, resonant inductance, n first diode, n
Resonant capacitance, the third and fourth diode of n group；Wherein n is the integer greater than 1；
The Sofe Switch auxiliary circuit has first end to the end 2n+2；
The first end of the n first diode is connect with the first end of Sofe Switch auxiliary circuit to the n-th end respectively, and the n
The second end of first diode is commonly connected to the first end of the resonant inductance, and the second end of the resonant inductance passes through described
Auxiliary switch pipe is connect with the n-th+2 end of Sofe Switch auxiliary circuit；Every group of third and in third and fourth diode of n group
Be connected to after four diode series aiding connections the resonant inductance second end and the Sofe Switch auxiliary circuit the (n+1)th end it
Between；Every group of third and fourth diode intermediate node by a resonant capacitance respectively with the n-th+3 end of Sofe Switch auxiliary circuit extremely
The connection of the end 2n+2.
2. a kind of two-phase inputs pfc circuit, including positive boost circuit and negative sense boost circuit；The forward direction boost circuit
With a bus capacitor and two main switches are all had in negative sense boost circuit；It is characterized by: the forward direction boost
Circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit includes: one
Auxiliary switch pipe, a resonant inductance, two first diodes；Two resonant capacitances, two group of third and fourth diode；
In the forward direction boost circuit: the current input terminal of each main switch passes through a positive first diode respectively
It is connected to the first end of resonant inductance, the second end of resonant inductance is connected by the current output terminal of auxiliary switch pipe and main switch
It connects；The positive second end of resonant inductance and the anode of bus capacitor of being connected to after every group of third and fourth diode series aiding connection
Between；Every group of third and fourth diode intermediate node is respectively connected to each master in positive boost circuit by a resonant capacitance
The current input terminal of switching tube；
In the negative sense boost circuit: the current output terminal of each main switch passes through a reversed first diode respectively
It is connected to the first end of resonant inductance, the second end of resonant inductance passes through the current input terminal of auxiliary switch pipe and the main switch
Connection；Opposite direction connection is in the second end of resonant inductance and the cathode of bus capacitor after every group of third and fourth diode series aiding connection
Between；Every group of third and fourth diode intermediate node is respectively connected in negative sense boost circuit each by a resonant capacitance
The current output terminal of main switch.
3. a kind of three-phase input pfc circuit, including positive boost circuit and negative sense boost circuit；The forward direction boost circuit
With a bus capacitor and three main switches are all had in negative sense boost circuit；It is characterized in that, the forward direction boost
Circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary circuit includes: one
Auxiliary switch pipe, a resonant inductance, three first diodes, three resonant capacitances, three group of third and fourth diode；
In the forward direction boost circuit: the current input terminal of each main switch passes through a positive first diode respectively
It is connected to the first end of resonant inductance, the second end of resonant inductance is connected by the current output terminal of auxiliary switch pipe and main switch
It connects；The positive second end of resonant inductance and the anode of bus capacitor of being connected to after every group of third and fourth diode series aiding connection
Between；Every group of third and fourth diode intermediate node is respectively connected in the forward direction boost circuit often by a resonant capacitance
The current input terminal of a main switch；
In the negative sense boost circuit: the current output terminal of each main switch passes through a reversed first diode respectively
It is connected to the first end of resonant inductance, the second end of resonant inductance is connected by the current input terminal of auxiliary switch pipe and main switch
It connects；Every group of third and fourth diode series aiding connection together after Opposite direction connection resonant inductance second end and bus capacitor
Between cathode；Every group of third and fourth diode intermediate node is respectively connected to the negative sense boost electricity by a resonant capacitance
The current output terminal of each main switch in road.
4. a kind of three-phase input pfc circuit, including positive boost circuit and negative sense boost circuit；The forward direction boost circuit
With a bus capacitor and three main switches are all had in negative sense boost circuit, each master opens in the forward direction boost circuit
The current input terminal for closing pipe is connected to the main inductance of every phase by a 8th reversed diode；It is every in negative sense boost circuit
The current output terminal of a main switch is connected to the main inductance of every phase by a 8th positive diode；It is characterized in that,
The forward direction boost circuit and negative sense boost circuit further comprise a Sofe Switch auxiliary circuit；The Sofe Switch auxiliary
Circuit include: an auxiliary switch pipe, a resonant inductance, three first diodes, three resonant capacitances and three groups of thirds and
4th diode；
In the forward direction boost circuit: the first end of resonant inductance passes through a reversed first diode respectively and is connected to often
The second end of the anode of a 8th diode, resonant inductance is connected by the current output terminal of auxiliary switch pipe and main switch；Often
It is positive after the third and fourth diode series aiding connection of group to be connected between the second end of resonant inductance and the anode of bus capacitor；Often
The third and fourth diode intermediate node of group is respectively connected to each master in the forward direction boost circuit by a resonant capacitance and opens
Close the current input terminal of pipe；
In the negative sense boost circuit: the first end of resonant inductance passes through a positive first diode respectively and is connected to often
The second end of the anode of a 8th diode, resonant inductance is connected by the current input terminal of auxiliary switch pipe and main switch；And
Opposite direction connection is between the second end of resonant inductance and the cathode of bus capacitor after every group of third and fourth diode series aiding connection；
Every group of third and fourth diode intermediate node is respectively connected to each master in the negative sense boost circuit by a resonant capacitance
The current output terminal of switching tube.
5. a kind of circuit control method, which is characterized in that inputted suitable for two-phase described in any one of claim 2-4
Pfc circuit or three-phase input pfc circuit, the control signal rising edge alignment of each main switch in the circuit, and each
The first preset time opens each auxiliary switch pipe before the unlatching of a main switch, and second is default after the unlatching of each main switch
Time closes each auxiliary switch pipe.
6. circuit control method according to claim 5, which is characterized in that first preset time meets following public
Formula:
t1≥I×Lr/U；
Wherein, U is the busbar voltage of bus capacitor, and I is the input peak point current of circuit, and Lr is the inductance sense of the resonant inductance
Amount.
7. a kind of uninterruptible power supply, which is characterized in that wanted including Sofe Switch auxiliary circuit described in claim 1 or right
Two-phase described in asking 2 inputs pfc circuit or three-phase input pfc circuit as claimed in claim 3.
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| CN201410654481.8A CN105656296B (en) | 2014-11-17 | 2014-11-17 | Sofe Switch auxiliary circuit, two-phase or three-phase input pfc circuit and control method |
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| CN1317865A (en) * | 2001-05-16 | 2001-10-17 | 深圳市安圣电气有限公司 | Dual-unit step-up switch converter |
| CN102684472A (en) * | 2012-04-26 | 2012-09-19 | 华为技术有限公司 | Three-phase power factor correction circuit device |
| TW201414149A (en) * | 2012-09-18 | 2014-04-01 | Nat Univ Chin Yi Technology | High voltage ratio interleaved converter with soft-switching |
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| TWI233009B (en) * | 2003-07-28 | 2005-05-21 | Delta Electronics Inc | Three-phase power factor correction converter with soft-switching |
| JP2012070490A (en) * | 2010-09-21 | 2012-04-05 | Tdk Corp | Bridgeless power factor improvement converter |
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|---|---|---|---|---|
| CN1317865A (en) * | 2001-05-16 | 2001-10-17 | 深圳市安圣电气有限公司 | Dual-unit step-up switch converter |
| CN102684472A (en) * | 2012-04-26 | 2012-09-19 | 华为技术有限公司 | Three-phase power factor correction circuit device |
| TW201414149A (en) * | 2012-09-18 | 2014-04-01 | Nat Univ Chin Yi Technology | High voltage ratio interleaved converter with soft-switching |
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