CN208890675U - A kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp - Google Patents
A kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp Download PDFInfo
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Abstract
The utility model discloses a kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp, comprising: three Inductors, three exchange lateral capacitances, three-phase uncontrollable rectifier full-bridge, three two-way switch, positive bus-bar single-phase full bridge, negative busbar single-phase full bridge, two isolating transformers, single-phase uncontrollable rectifier full-bridge, clamp circuit, DC side filter inductance and DC side filter capacitor.The utility model is able to solve when three-phase 380V alternating voltage is transformed to low-voltage dc voltage by three-phase rectifier in the prior art the problem of must using two-level configuration, while realizing electrical isolation.
Description
Technical field
The present invention relates to AC/DC rectifier technical field, especially a kind of Sofe Switch type single stage type with active-clamp
High-frequency isolation rectifier.
Background technique
It is needed in the application fields such as the charging of electric car (EV) battery, data center's DC power-supply system by electric energy from friendship
Galvanic electricity is converted to direct current.It is single-phase can the rectifier of PFC (PFC) be commonly used in low power applications, such as power is small
In 5kW, in higher power occasion, it is necessary to use three-phase PFC rectifier.Three-phase rectifier is according to whether have DC side inductance
Two major classes can be divided into: current source type and voltage-source type rectifier；According to whether there are high-frequency isolation transformers can be divided into again
Isolated form and non-isolation type.
The non-isolated three-phase voltage source type rectifier being made of three-phase bridge circuit, when rectifying work, DC side is in boosting
Characteristic, three-phase 380V alternating voltage DC voltage after its transformation are generally up to 600~800V, it usually needs pass through isolating transformer
Or it can be just connected on low-voltage direct bus after rear class adds DC/DC converter to be depressured.In addition, voltage-source type AC/DC becomes
The rectification mode of parallel operation is boosting (boost) type, there are starting shock problem, needs that starting is added in power transfer path
Current limiting measures influence transducer effciency and power density, meanwhile, booster type circuit in unloaded or underloading work, close by system
There is also biggish difficulty for ring control, it is difficult to take into account the stability and fast dynamic response characteristic of control.
Isolated form rectifier usually requires two-stage type structure, and one is power frequency isolation transformer is added in prime, this can be led
Mutagens parallel operation overall volume weight is big, at high cost；Another kind is that the two-way DC/DC converter of high-frequency isolation is added in rear class, still
Two-stage type power conversion has very big negative effect to system effectiveness, and the two-way DC/DC converter of existing high-frequency isolation is wide
Characteristic under the conditions of voltage change range is poor, and this converter is difficult to adapt to the application demand of wide input and output voltage variation.
In addition, the presence of single stage type high-frequency isolation rectifier medium/high frequency transformer leakage inductance can be posted with secondary side high-frequency rectification bridge
Resonance phenomena occurs for raw capacitor, output voltage average value when the secondary voltage stress in rectifier being caused to be twice secondary, and then makes
Rectifier output voltage design value be less than half rectifier diode voltage stress.Therefore, single stage type high-frequency isolation is whole
Stream device cannot achieve the voltage output of wide scope.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of Sofe Switch type single stage type high frequency with active-clamp
Isolation rectification device, when being able to solve that three-phase 380V alternating voltage is transformed to low-voltage dc voltage by three-phase rectifier in the prior art
The problem of two-level configuration must be used, while realizing electrical isolation.
In order to solve the above technical problems, the present invention provides a kind of Sofe Switch type single stage type high-frequency isolation with active-clamp
Rectifier, comprising: three Inductors, three exchange lateral capacitances, three-phase uncontrollable rectifier full-bridge, three two-way switch, positive poles
Line single-phase full bridge, negative busbar single-phase full bridge, two isolating transformers, single-phase uncontrollable rectifier full-bridge, clamp circuit, DC side filtering
Inductance and DC side filter capacitor；Three Inductor one end are connected respectively to three-phase alternating-current supply input, other end difference
It is connected to three exchange lateral capacitances, three exchange lateral capacitances use star-like connection, in three bridge arms of three-phase uncontrollable rectifier full-bridge
Point is connected respectively to three two-way switch, and the other end of three two-way switch is connected to an identical node Y simultaneously, and three-phase is complete
The positive direct-current bus nodes p and node Y of bridge are connected respectively to the public input side of positive bus-bar single-phase full bridge, while node Y and three
The negative DC bus node n of phase full-bridge is connected respectively to the public input side of negative busbar single-phase full bridge, positive bus-bar single-phase full bridge
Two groups of bridge arm midpoint outputs are connected to the primary side of isolating transformer T1, and two groups of bridge arm midpoints of negative busbar single-phase full bridge export connection
It forward connects to the secondary side of the primary side of isolating transformer T2, isolating transformer T1 and T2 according to Same Name of Ends, after transformer series
Output end is connected to two groups of bridge arm midpoints of single-phase rectifier full-bridge, and a public output mouth of single-phase rectifier full-bridge is connected to pincers
Position circuit branch and DC side filter inductance, the other end of DC side filter inductance are the positive direct-current bus port of converter,
Bus interface is connect with one end of DC side filter capacitor simultaneously, and the other end of DC side filter capacitor is the negative direct current of converter
Bus port, negative DC bus interface while another public output mouth phase also with single-phase rectifier full-bridge and clamp circuit
Even.
Preferably, three-phase uncontrollable rectifier full-bridge is made of six diodes, first diode Da+Anode and the two or two pole
Pipe Da-Cathode be connected be used as a bridge arm, third diode Db+Anode and the 4th diode Db-Cathode be connected be used as one
A bridge arm, the 5th diode Dc+Anode and the 6th diode Dc-Cathode be connected be used as a bridge arm, first diode Da+、
Third diode Db+, the 5th diode Dc+Cathode be connected positive direct-current bus nodes p as three phase full bridge, the second diode
Da-, the 4th diode Db-, the 6th diode Dc-Anode be connected negative DC bus node n as three-phase uncontrollable rectifier full-bridge.
Preferably, three two-way switch are made of six switching tubes, third switching tube Sya+Emitter and second switch
Sya-Emitter be connected to form a two-way switch, third switching tube Syb+Emitter and the 4th switching tube Syb-Emitter
It is connected to form a two-way switch, the 5th switching tube Syc+Emitter and the 6th switching tube Syc-Emitter be connected to form one
Two-way switch.
Preferably, positive bus-bar single-phase full bridge is made of four switching tubes, the 7th switching tube Sp1Emitter and the 8th switch
Pipe Sp2Collector be connected be used as a bridge arm, the 9th switching tube Sp3Emitter and the tenth switching tube Sp4Collector be connected
As a bridge arm, the 7th switching tube Sp1Collector and the 9th switching tube Sp3Collector be connected it is single-phase complete as positive bus-bar
The positive direct-current node of bridge is connected with the positive direct-current bus nodes p of three phase full bridge, the 8th switching tube Sp2Emitter and the tenth switch
Pipe Sp4Emitter be connected be connected as the negative DC node of positive bus-bar single-phase full bridge with the common node Y of two-way switch.
Preferably, negative busbar single-phase full bridge is made of four switching tubes, the 11st switching tube Sn1Emitter and the 12nd
Switching tube Sn2Collector be connected be used as a bridge arm, the 13rd switching tube Sn3Emitter and the 14th switching tube Sn4Collection
Electrode, which is connected, is used as a bridge arm, the 11st switching tube Sn1Collector and the 13rd switching tube Sn3Collector be connected conduct
The positive direct-current node of negative busbar single-phase full bridge is connected with the common node Y of two-way switch, the 12nd switching tube Sn2Emitter with
14th switching tube Sn4Emitter be connected as negative busbar single-phase full bridge negative DC node and three phase full bridge negative direct current mother
Line node n is connected.
Preferably, single-phase rectifier full-bridge is made of four diodes, the 7th diode Dd1Anode and the 8th diode Dd2
Cathode be connected be used as a bridge arm, the 9th diode Dd3Anode and the tenth diode Dd4Cathode be connected be used as a bridge
Arm, the 7th diode Dd1Cathode and the 9th diode Dd3Cathode be connected positive direct-current side gusset as single-phase rectifier full-bridge,
8th diode Dd2Anode and the tenth diode Dd4Anode be connected negative direct current side gusset as single-phase rectifier full-bridge.
Preferably, clamp circuit is made of a switching tube and a capacitor, the 15th switching tube SauEmitter conduct
The positive node of clamp circuit, the 15th switching tube SauCollector and Absorption Capacitance CauIt is connected, the other end conduct of Absorption Capacitance
The negative nodal point of clamp circuit；Or the 15th switching tube SauNegative nodal point of the collector as clamp circuit, the 15th switching tube Sau
Emitter and Absorption Capacitance CauIt is connected, positive node of the other end of Absorption Capacitance as clamp circuit.
Preferably, switching tube is composed in parallel by a single-way switch pipe and a two pole Xuan, single-way switch pipe when in parallel
Emitter be connected with the anode of diode, the collector of single-way switch pipe is connected with the cathode of diode.
Preferably, diode is the anti-and diode of IGBT or the parasitic diode of MOSFET.
Preferably, the control signal of two-way switch is judged by the angle that phaselocked loop provides, by grid cycle
Voltage is divided into six sectors and judges and control.
Positive bus-bar full-bridge is adopted with negative busbar full-bridge in Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp
With phase-shift soft switch working method, the control of two groups of bridge arms of positive bus-bar full-bridge and negative busbar full-bridge uses phase shifting control, and every group
The upper down tube driving signal of bridge arm is complementary, and the control signal lag of one group of bridge arm is in another group of one phase bit of bridge arm (control signal
Advanced bridge arm is known as leading-bridge, and the bridge arm for controlling signal lag is known as lagging leg), and positive bus-bar full-bridge and negative busbar are complete
The lagging leg of bridge drives logical synchronization, and leading-bridge driving carries out phase shifting control, i.e. two groups of shiftings between lagging leg driving
The phase-shift pulse left-justify of phase full-bridge.
Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp, the control signal logic of clamp switch are
The opening when two groups of phase-shifting full-bridges start simultaneously at transmitting power, turns off when two groups of phase-shifting full-bridges stop and transmit power together.
Sofe Switch type single stage type high-frequency isolation rectifier medium/high frequency transformer leakage inductance with active-clamp causes duty ratio
The compensation way of loss is according to the current information i on current DC inductancedcControl to the positive and negative busbar full-bridge that controller generates
Phase shifting angle processed carries out adaptive equalization.
The invention has the benefit that the present invention uses current source type AC/DC structure, the rectification mould of buck type is realized
Formula avoids the starting shock problem of previous boost rectification mode, while solving three-phase AC/DC rectifier in the prior art will
The problem of three-phase 380V alternating voltage must use two-level configuration when being transformed to low-voltage dc voltage, while realizing electrical isolation；
The resonance potential that the design of active clamping circuir absorbs the leakage inductance of high frequency transformer and high-frequency rectification diode generates, is widened
The direct voltage output range of rectifier；HF switch power device may be implemented in the phase-shifting full-bridge structure that uses in topology
Sofe Switch realizes higher efficiency；Meanwhile phase shifting angle adaptive equalization strategy compensates for and controls duty ratio using phase-shifting full-bridge
The problem of losing the input AC current distortion generated；In addition, the present invention also has, current on line side sine degree is good, net side power because
Number is high, electric energy transmits efficient feature.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the control block diagram in the embodiment of the present invention.
Fig. 3 is that the sector of present invention exchange side voltage divides schematic diagram.
Fig. 4 is voltage and current waveform schematic diagram of the present invention by crucial branch and node after sector selection structure.
Fig. 5 (a) is 1 schematic diagram of state that rectifier of the present invention transmits power.
Fig. 5 (b) is 2 schematic diagram of state that rectifier of the present invention transmits power.
Fig. 5 (c) is 3 schematic diagram of state that rectifier of the present invention transmits power.
Fig. 5 (d) is 4 schematic diagram of state that rectifier of the present invention transmits power.
Fig. 6 is in rectifier of the present invention between the phase shift angle of phase-shifting full-bridge, input current and the power rating of converter
Relation schematic diagram.
Fig. 7 is the driving logical schematic that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (a) is the equivalent simplified circuit schematic diagram that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (b) is 0 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (c) is 1 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (d) is 2 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (e) is 3 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (f) is 4 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (g) is 5 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (h) is 6 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (i) is 7 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Fig. 8 (j) is 8 schematic diagram of mode that rectifier phase-shifting full-bridge of the present invention realizes Sofe Switch process.
Specific embodiment
As shown in Figure 1, a kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp, comprising: three friendships
Flow side inductance, three exchange lateral capacitances, three-phase uncontrollable rectifier full-bridge, three two-way switch, positive bus-bar single-phase full bridges, negative busbar list
Phase full-bridge, two isolating transformers, single-phase uncontrollable rectifier full-bridge, clamp circuit, DC side filter inductance and DC side filtered electrical
Hold；Three Inductor one end are connected respectively to three-phase alternating-current supply input, and the other end is connected respectively to three exchange side electricity
Hold, three exchange lateral capacitances use star-like connection, and three bridge arm midpoints of three-phase uncontrollable rectifier full-bridge are connected respectively to three pairs
To switch, the other end of three two-way switch is connected to an identical node Y, the positive direct-current bus nodes of three phase full bridge simultaneously
P and node Y is connected respectively to the public input side of positive bus-bar single-phase full bridge, while the negative DC bus of node Y and three phase full bridge
Node n is connected respectively to the public input side of negative busbar single-phase full bridge, and two groups of bridge arm midpoints of positive bus-bar single-phase full bridge, which export, to be connected
It is connected to the primary side of isolating transformer T1, two groups of bridge arm midpoints output of negative busbar single-phase full bridge is connected to the original of isolating transformer T2
The secondary side on side, isolating transformer T1 and T2 is forward connected according to Same Name of Ends, and the output end after transformer series is connected to single-phase whole
Two groups of bridge arm midpoints of full-bridge are flowed, a public output mouth of single-phase rectifier full-bridge is connected to clamp circuit branch and direct current
Side filter inductance, the other end of DC side filter inductance are the positive direct-current bus port of converter, bus interface while and direct current
One end of side filter capacitor connects, and the other end of DC side filter capacitor is the negative DC bus port of converter, and negative direct current is female
Line interface is also connected with another public output mouth of single-phase rectifier full-bridge and clamp circuit simultaneously.
Fig. 1 is the circuit basic structure schematic diagram of Sofe Switch type single stage type high-frequency isolation rectifier, by three exchange side electricity
Sense, three exchange lateral capacitances, three-phase uncontrollable rectifier full-bridge, three two-way switch, positive bus-bar single-phase full bridge, negative busbar are single-phase complete
Bridge, two isolating transformers, single-phase rectifier full-bridge, clamp circuit, DC side filter inductance and DC side filter capacitor composition.Figure
D in 1a+、Da-、Db+、Db-、Dc+、Dc-、Dd1、Dd2、Dd3、Dd4For diode, Sya+、Sya-、 Syb+、Syb-、Syc+、Syc-、Sp1、
Sp2、Sp3、Sp4、Sn1、Sn2、Sn3、Sn4, be switching tube.Each switching tube is by Guan Yuyi diode of a single-way switch
It is formed in parallel, the emitter of single-way switch pipe is connected with the anode of diode when in parallel, the cathode of the pipe of collector and diode
It is connected.Diode in parallel can be the anti-and diode of IGBT, be also possible to the parasitic diode of MOSFET.Work as switching frequency
When lower, using common rectifier diode；When switching frequency is higher, using two pole of fast recovery diode or Schottky
Pipe.
The composition of three-phase uncontrollable rectifier full-bridge are as follows: first diode Da+Anode and the second diode Da-Cathode be connected
As a bridge arm, third diode Db+Anode and the 4th diode Db-Cathode be connected be used as a bridge arm, the five or two pole
Pipe Dc+Anode and the 6th diode Dc-Cathode be connected be used as a bridge arm, first diode Da+, third diode Db+,
Five diode Dc+Cathode be connected positive direct-current bus nodes p, the second diode D as three phase full bridgea-, the 4th diode Db-、
6th diode Dc-Anode be connected negative DC bus node n as three-phase uncontrollable rectifier full-bridge.
The composition of three two-way switch are as follows: first switch tube Sya+Emitter and second switch Sya-Emitter be connected
Form a two-way switch, third switching tube Syb+Emitter and the 4th switching tube Syb-Emitter be connected to form one it is two-way
Switch, the 5th switching tube Syc+Emitter and the 6th switching tube Syc-Emitter be connected to form a two-way switch.
Three Inductor one end are connected respectively to three-phase alternating-current supply input, and the other end is connected respectively to three exchanges
Lateral capacitance, three bridge arm midpoints of three phase full bridge and three two-way switch, the other end of three two-way switch are connected to simultaneously
One identical node Y, three exchange lateral capacitances are not connected to same node with that one end of inductance connection jointly.
The composition of positive bus-bar single-phase full bridge are as follows: the 7th switching tube Sp1Emitter and the 8th switching tube Sp2Collector phase
Continuous cropping is a bridge arm, and bridge arm midpoint is connected to the Same Name of Ends of transformer T1.9th switching tube Sp3Emitter and the tenth switch
Pipe Sp4Collector be connected be used as a bridge arm, bridge arm midpoint is connected to the different name end of transformer T1.7th switching tube Sp1's
Collector and the 9th switching tube Sp3Collector be connected as positive bus-bar single-phase full bridge positive direct-current node and three phase full bridge just
DC bus node p is connected.8th switching tube Sp2Emitter and the tenth switching tube Sp4Emitter be connected be used as positive bus-bar list
The negative DC node of phase full-bridge is connected with the common node Y of two-way switch.
The composition of negative busbar single-phase full bridge are as follows: the 11st switching tube Sn1Emitter and the 12nd switching tube Sn2Current collection
Extremely it is connected and is used as a bridge arm, bridge arm midpoint is connected to the Same Name of Ends of transformer T2.13rd switching tube Sn3Emitter and
14 switching tube Sn4Collector be connected be used as a bridge arm, bridge arm midpoint is connected to the different name end of transformer T2.11st opens
Close pipe Sn1Collector and the 13rd switching tube Sn3Collector be connected as negative busbar single-phase full bridge positive direct-current node with pair
It is connected to the common node Y of switch.12nd switching tube Sn2Emitter and the 14th switching tube Sn4Emitter be connected conduct
The negative DC node of negative busbar single-phase full bridge is connected with the negative DC bus node n of three phase full bridge.
The different name end of two isolating transformer T1 and the Same Name of Ends of T2 are connected, and formation is forward connected, and two are formed after series connection
Output port.
The composition of single-phase rectifier full-bridge are as follows: the 7th diode Dd1Anode and the 8th diode Dd2Cathode be connected conduct
One bridge arm, bridge arm midpoint are connected to the Same Name of Ends of isolating transformer T1.9th diode Dd3Anode and the tenth diode Dd4
Cathode be connected be used as a bridge arm, bridge arm midpoint is connected to the different name end of isolating transformer T2.7th diode Dd1Cathode
With the 9th diode Dd3Cathode be connected positive direct-current side gusset as single-phase rectifier full-bridge, the 8th diode Dd2Anode with
Tenth diode Dd4Anode be connected negative direct current side gusset as single-phase rectifier full-bridge.
The composition of clamp circuit are as follows: the 15th switching tube SauPositive node of the emitter as clamp circuit, the 15th opens
Close pipe SauCollector and Absorption Capacitance CauIt is connected, negative nodal point of the other end of Absorption Capacitance as clamp circuit.
The composition of DC filtering branch are as follows: the positive direct-current side gusset and DC filtering inductance and clamp of single-phase rectifier full-bridge
The positive node of circuit is connected, the output cathode that the other end of DC filtering inductance is connected as rectifier with DC filter capacitor；
The negative direct current side gusset of single-phase rectifier full-bridge is connected with the negative nodal point of the other end of DC filter capacitor and clamp circuit, as
The output negative pole of rectifier.
Below by by taking the Sofe Switch type single stage type high-frequency isolation rectifier in Fig. 1 as an example, illustrates and convert in conjunction with remaining figure
The working principle of device.Before analysis, there is following hypothesis: 1) all switching tubes and diode are ideal component；2) all inductance, electricity
Hold, transformer is ideal element；3) the three-phase symmetrical ideal power grid of power grid；4) DC side filter inductance is sufficiently large, can be considered reason
Think current source, idcFor DC side electric current；5) DC side filter capacitor is sufficiently large, can be considered ideal voltage source, UdcFor DC side electricity
Pressure.When rectifying work, it is input side that converter, which exchanges side, connects three-phase alternating current potential source, direct current is outlet side, connects load.Inversion
When, converter DC side is input side, connects DC voltage source, and exchange side is outlet side, connects load or three-phase alternating current potential source.
Control block diagram is as shown in Fig. 2, being divided into the selection control of low frequency sector and the high frequency bridge Phase shifted PWM Controlled of Sofe Switch, height may be implemented
The generation of phase shift angle needed for frequency displacement phase control uses DC voltage outer ring, and the double governor structure of DC current inner ring is to two groups
Phase-shifting full-bridge carries out phase shifting control.The effect of direct current outer ring is that DC bus-bar voltage is maintained to stablize, the effect of DC current inner ring
It is quick tracking load variation, and output power can be limited.
Fig. 3 gives in the present invention and divides signal to the sector of three-phase voltage, it is assumed that 0 angle moment A phase sinusoidal voltage ua
For maximum value, π angle moment A phase sinusoidal voltage uaFor minimum value.B phase voltage lags 2 π/3 of A phase voltage, and C phase voltage lags B
2 π/3 of phase voltage.Setting π/3 0- are sector 1, behind and so on.
Three-phase uncontrollable rectifier bridge and three two-way switch constitute the sector selection switch in topology of the invention, only in sector
It is acted when switching, the switch state of switching tube is as shown in the table when each sector switch, wherein 1 represents open-minded, 0 represents and closes
It is disconnected.
Voltage U when the switch motion of low frequency sector, between node p and node YpyAnd between node Y and node n
Voltage UynAlso in low frequency pulsating mechanical periodicity, transformation period is three times power frequency period.As control positive pole line current ip, negative busbar electricity
Flow inAnd current difference iYAlso according to low frequency pulsating shown in Fig. 4 change when may be implemented converter alternating current sine degree with
And unity power factor.As shown in Fig. 5 (a), Fig. 5 (b), Fig. 5 (c) and Fig. 5 (d), the state of power is transmitted according to two groups of full-bridges,
Four states can be divided into, positive bus-bar full-bridge transmits power together with negative busbar full-bridge in Fig. 5 (a)；There was only positive pole in Fig. 5 (b)
Line full-bridge transmits power；Only have negative busbar full-bridge to transmit power in Fig. 5 (c)；There is no full-bridge to transmit power in Fig. 5 (d).Such as Fig. 6
It is shown, θ is assumed according to phase-shifting full-bridgepFor the phase shifting angle between two groups of bridge arms of positive bus-bar full-bridge, θnFor two groups of bridge arms of negative busbar full-bridge
Between phase shifting angle, since the DC inductance of DC side can be considered as Constant Direct Current source idc, the input current i of positive bus-bar full-bridgep
It can be regarded as to DC current idcChopper current, the output electric current i of similar negative busbar full-bridgenIt can be regarded as to DC current idc
Chopper current.
Generation, the driving life of lead-lag bridge arm at two groups of high frequency full-bridge phase shifting angles by taking sector 1 as an example, will be specifically introduced below
Logic is generated at the driving of logic and clamp circuit.In sector 1, electric current ipFundamental wave is A phase current, electric current inFundamental wave is C phase
Electric current, electric current iYFundamental wave is B phase current, according to the average value principle of equal effects, the average current i of any switch periodspIt can indicate
Are as follows:
It is isolating transformer no-load voltage ratio in k.Similarly have
As the electric current i of any timepAnd inPeriod average it is equal with ac-side current up time value when, that is, realize hand over
Galvanic electricity stream sine degree and unity power factor control, therefore, the expression formula of three phase shifting angles in sector 1 are as follows:
Other five sectors can analogize in this way.
After obtaining the phase shift angle of two groups of phase-shifting full-bridges, the tool of each switching tube of two groups of full-bridges and clamp circuit switching tube
Body logic diagram is as shown in Figure 7.The reference that phase shift angular breadth is generated by adjuster in each switch periods with count up
TOP is worth triangle wave to obtain, and ref_p corresponds to phase shifting angle θp, ref_n corresponds to phase shifting angle θn, DT is to generate lower switch on bridge arm
One fixed value in pipe dead zone.9 mode can be divided into one power transfer period, as Fig. 8 (a), Fig. 8 (b), Fig. 8 (c),
Low frequency sector choosing shown in Fig. 8 (d), Fig. 8 (e), Fig. 8 (f), Fig. 8 (g), Fig. 8 (h), Fig. 8 (i) and Fig. 8 (j), in circuit structure
It selects module and is simplified as two voltage source UpYAnd UYn。
Mode 0:t0Before moment, only Sp1、Sp4、Sn1And Sn4In the conductive state, transformer secondary side current flows through diode
Dd1With Dd4.The conducting power state of converter becomes shown in Fig. 5 (a) at this time.
Mode 1:t0-t1, Sn1Shutdown.Primary side current of transformer is from Sn1Channel switch to Sn1With Sn2Parasitic junction capacitance Cn1
And Cn2, and Cn1Charging, Cn2Electric discharge.When discharge off, the primary current of transformer T2 switches to Sn2Body diode.
Mode 2:t1-t2, Sn2It is open-minded.Since electric current switches to body diode in mode 1, advance pipe Sn2Zero electricity
It presses off logical.The conducting power state of converter becomes shown in Fig. 5 (b) at this time.
Mode 3:t2-t3, Sp1Shutdown.Primary side current of transformer is from Sp1Channel switch to Sp1With Sp2Parasitic junction capacitance Cp1
And Cp2, and Cp1Charging, Cp2Electric discharge.When discharge off, the primary current of transformer T1 switches to Sp2Body diode.
Mode 4:t3-t4, Sp2It is open-minded.Since electric current switches to body diode in mode 1, advance pipe Sp2Zero electricity
It presses off logical.The conducting power state of converter becomes shown in Fig. 5 (d) at this time.Transformer secondary side current flows through diode Dd1、Dd2、
Dd3With Dd4, DC inductance LdcIn freewheeling state.
Mode 5:t4-t5, Sp4With Sn4It simultaneously turns off.The primary current of transformer T1 is from Sp4Channel switch to Sp3With Sp4
Parasitic junction capacitance Cp3And Cp4, transformer T2 primary current is from Sn4Channel switch to Sn3With Sn4Parasitic junction capacitance Cn3And Cn4, this
Stage Cp4Charging, Cp3Electric discharge, Cn4Charging, Cn3Electric discharge.When discharge off, transformer T1 primary side current switching to Sp3Body two
Pole pipe, transformer T2 primary current switch to Sn3Body diode.
Mode 6:t5-t6, Sp3With Sn3And clamper tube SauIt is open-minded simultaneously.Since electric current switches to two pole of body in mode 5
Therefore pipe lags pipe Sp3With Sn3No-voltage is open-minded.Clamping capacitance accesses hf rectifier both ends at the moment, increase it is equivalent simultaneously
It is associated in the capacitance at secondary transformer both ends, the resonance frequency of leakage inductance and parasitic capacitance greatly reduces, in a switch periods
Will not resonance to twice average output voltage.
Mode 7:t6-t7, Sp2、Sp3With Sn2、Sn3It is in the conductive state simultaneously.Transformer T1 and T2 electric current complete reversely,
Secondary side diode starts reversely to rise to output current value still in freewheeling state, transformer secondary side current is all turned at this time.
Mode 8:t7-t8, Sp2、Sp3With Sn2、Sn3It is in the conductive state simultaneously.Transformer secondary side current reversely rises
To output current value, secondary side diode Dd1With Dd4Shutdown, at this point, the conducting power state of converter becomes shown in Fig. 5 (a).t8
Moment, clamper tube shutdown disconnect clamping capacitance branch and main loop of power circuit.
9 mode that subsequent mode analyzes similar front, 8 switching tubes of positive and negative busbar full-bridge realize zero electricity
It presses off logical.
In conjunction with Fig. 7 and Fig. 8 (a), Fig. 8 (b), Fig. 8 (c), Fig. 8 (d), Fig. 8 (e), Fig. 8 (f), Fig. 8 (g), Fig. 8 (h), Fig. 8
(i) it is analyzed with Fig. 8 (j), in t5-t7The electric current of stage transformer completes reverse procedure, and secondary side diode is all in conducting afterflow
State, the voltage width exported at this time are narrower than ideal setting width, to form duty-cycle loss phenomenon.Therefore Fig. 2 control is used
Adaptive compensation algorithm in block diagram processed passes through DC current idcThe phase shifting angle for needing to compensate out with converter parameter estimation itself
Spend θc, make up control precision defect caused by duty-cycle loss phenomenon.
Claims (10)
1. a kind of Sofe Switch type single stage type high-frequency isolation rectifier with active-clamp characterized by comprising three exchanges
Side inductance, three exchange lateral capacitances, three-phase uncontrollable rectifier full-bridge, three two-way switch, positive bus-bar single-phase full bridge, negative busbars are single-phase
Full-bridge, two isolating transformers, single-phase uncontrollable rectifier full-bridge, clamp circuit, DC side filter inductance and DC side filter capacitor；
Three Inductor one end are connected respectively to three-phase alternating-current supply input, and the other end is connected respectively to three exchange lateral capacitances,
Three exchange lateral capacitances use star-like connection, and three bridge arm midpoints of three-phase uncontrollable rectifier full-bridge are connected respectively to three two-way openeds
Close, the other ends of three two-way switch is connected to an identical node Y simultaneously, the positive direct-current bus nodes p of three phase full bridge with
Node Y is connected respectively to the public input side of positive bus-bar single-phase full bridge, while the negative DC bus node of node Y and three phase full bridge
N is connected respectively to the public input side of negative busbar single-phase full bridge, and two groups of bridge arm midpoints output of positive bus-bar single-phase full bridge is connected to
The primary side of isolating transformer T1, two groups of bridge arm midpoints output of negative busbar single-phase full bridge are connected to the primary side of isolating transformer T2,
The secondary side of isolating transformer T1 and T2 are forward connected according to Same Name of Ends, and it is complete that the output end after transformer series is connected to single-phase rectifier
Two groups of bridge arm midpoints of bridge, a public output mouth of single-phase rectifier full-bridge are connected to clamp circuit branch and DC side filter
Wave inductance, the other end of DC side filter inductance are the positive direct-current bus port of converter, and bus interface is filtered with DC side simultaneously
One end of wave capacitor connects, and the other end of DC side filter capacitor is the negative DC bus port of converter, and negative DC bus connects
Mouth is also connected with another public output mouth of single-phase rectifier full-bridge and clamp circuit simultaneously.
2. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Three-phase uncontrollable rectifier full-bridge is made of six diodes, first diode Da+Anode and the second diode Da-Cathode be connected
As a bridge arm, third diode Db+Anode and the 4th diode Db-Cathode be connected be used as a bridge arm, the five or two pole
Pipe Dc+Anode and the 6th diode Dc-Cathode be connected be used as a bridge arm, first diode Da+, third diode Db+,
Five diode Dc+Cathode be connected positive direct-current bus nodes p, the second diode D as three phase full bridgea-, the 4th diode Db-、
6th diode Dc-Anode be connected negative DC bus node n as three-phase uncontrollable rectifier full-bridge.
3. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Three two-way switch are made of six switching tubes, third switching tube Sya+Emitter and second switch Sya-Emitter be connected
Form a two-way switch, third switching tube Syb+Emitter and the 4th switching tube Syb-Emitter be connected to form one it is two-way
Switch, the 5th switching tube Syc+Emitter and the 6th switching tube Syc-Emitter be connected to form a two-way switch.
4. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Positive bus-bar single-phase full bridge is made of four switching tubes, the 7th switching tube Sp1Emitter and the 8th switching tube Sp2Collector phase
Continuous cropping is a bridge arm, the 9th switching tube Sp3Emitter and the tenth switching tube Sp4Collector be connected and be used as a bridge arm, the
Seven switching tube Sp1Collector and the 9th switching tube Sp3Collector be connected as positive bus-bar single-phase full bridge positive direct-current node and
The positive direct-current bus nodes p of three phase full bridge is connected, the 8th switching tube Sp2Emitter and the tenth switching tube Sp4Emitter be connected
It is connected as the negative DC node of positive bus-bar single-phase full bridge with the common node Y of two-way switch.
5. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Negative busbar single-phase full bridge is made of four switching tubes, the 11st switching tube Sn1Emitter and the 12nd switching tube Sn2Current collection
Extremely it is connected and is used as a bridge arm, the 13rd switching tube Sn3Emitter and the 14th switching tube Sn4Collector be connected be used as one
A bridge arm, the 11st switching tube Sn1Collector and the 13rd switching tube Sn3Collector be connected be used as negative busbar single-phase full bridge
Positive direct-current node be connected with the common node Y of two-way switch, the 12nd switching tube Sn2Emitter and the 14th switching tube Sn4
Emitter be connected be connected as the negative DC node of negative busbar single-phase full bridge with the negative DC bus node n of three phase full bridge.
6. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Single-phase rectifier full-bridge is made of four diodes, the 7th diode Dd1Anode and the 8th diode Dd2Cathode be connected conduct
One bridge arm, the 9th diode Dd3Anode and the tenth diode Dd4Cathode be connected be used as a bridge arm, the 7th diode Dd1
Cathode and the 9th diode Dd3Cathode be connected positive direct-current side gusset as single-phase rectifier full-bridge, the 8th diode Dd2's
Anode and the tenth diode Dd4Anode be connected negative direct current side gusset as single-phase rectifier full-bridge.
7. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, which is characterized in that
Clamp circuit is made of a switching tube and a capacitor, the 15th switching tube SauPositive section of the emitter as clamp circuit
Point, the 15th switching tube SauCollector and Absorption Capacitance CauIt is connected, negative section of the other end of Absorption Capacitance as clamp circuit
Point；Or the 15th switching tube SauNegative nodal point of the collector as clamp circuit, the 15th switching tube SauEmitter and absorption
Capacitor CauIt is connected, positive node of the other end of Absorption Capacitance as clamp circuit.
8. the Sofe Switch type single stage type high-frequency isolation with active-clamp as described in any one of claim 3,4,5 or 7 is whole
Flow device, which is characterized in that switching tube is composed in parallel by a single-way switch pipe and a two pole Xuan, single-way switch pipe when in parallel
Emitter be connected with the anode of diode, the collector of single-way switch pipe is connected with the cathode of diode.
9. such as the described in any item Sofe Switch type single stage type high-frequency isolation rectifiers with active-clamp of claim 2 or 6,
It is characterized in that, diode is the anti-and diode of IGBT or the parasitic diode of MOSFET.
10. having the Sofe Switch type single stage type high-frequency isolation rectifier of active-clamp as described in claim 1, feature exists
In the control signal of two-way switch is judged by the angle that phaselocked loop provides, and the voltage of a grid cycle is divided into six
Sector judges and control.
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