CN102097970B - Soft switching inverting circuit and control method thereof - Google Patents
Soft switching inverting circuit and control method thereof Download PDFInfo
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- CN102097970B CN102097970B CN201010603936A CN201010603936A CN102097970B CN 102097970 B CN102097970 B CN 102097970B CN 201010603936 A CN201010603936 A CN 201010603936A CN 201010603936 A CN201010603936 A CN 201010603936A CN 102097970 B CN102097970 B CN 102097970B
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Abstract
The invention discloses a soft switching inverting circuit and a control method thereof. The soft switching inverting circuit comprises a control circuit, a direct current power source, a partial pressure circuit and an inverting bridge, wherein a resonance auxiliary circuit is connected between the partial pressure circuit and the inverting bridge, the resonance auxiliary circuit comprises two auxiliary switches V and Tr, a single-phase inverting bridge, a capacitor Cr, a diode D and an inducer Lr, the single-phase inverting bridge consists of diodes Dr1, Dr2, Dr3 and Dr4, and the resonance auxiliary circuit is connected with the control circuit and is used for controlling the switching on and off of the auxiliary switches V and Tr according to signals dV and dTr transmitted by the control circuit; and the soft switching inverting circuit has the control method that the control circuit transmits a control signal to reasonably control the switching on and off of the auxiliary switches V and Tr when a power device of the inverting bridge needs to be switched into another switching status from one switching status. After the invention is used, the defects that the additional cost is high, the control is complex, the power density of the inverter is low and the like in the prior art are overcome, the power density of the inverter is improved, the electromagnetic interference is reduced, and the control method is simple and easy to realize.
Description
Technical field
The invention belongs to the inverter technology field, especially relate to a kind of soft-switching inversion circuit and control method thereof.
Background technology
At present; Most of bridge-type inverters adopt hard switching pulse width modulation (PWM) technology; In the PWM inverter, the volume and weight of output transformer, filter inductance and radiator accounts for major part, for volume and the weight that reduces power electronic equipment; Improve the power density of inverter, must improve the switching frequency of inverter power switching device.But after the high frequencyization, the switching loss of device for power switching sharply increases, and causes the junction temperature of device for power switching sharply to rise, and has stoped the high frequencyization of power conversion circuit; And the voltage that device for power switching is very big after the high frequencyization, current changing rate (du/dt, di/dt) will produce bigger electromagnetic interference (EMI), influence the normal operation of circuit.Simultaneously, the voltage and current peak value of device for power switching conducting or shutdown moment possibly make the running orbit of device for power switching exceed safety operation area (SOA), causes the damage of device for power switching.Though adopt the switching loss of buffer circuit cpable of lowering power switching device, it transfers to Resistor-Capacitor Unit consumption with loss, system effectiveness is low.Therefore, people study resonant type soft-switch and solve the problems referred to above.So-called " soft switch technique " is exactly through resonance, and making device for power switching is zero or electric current conducting or shutoff when being zero at its voltage, and voltage and electric current is overlapping when avoiding the device for power switching switch, thus reduction du/dt, di/dt and switching loss.
But the resonance DC annulus inverter that early proposes exists, and switching voltage stress is higher, the resonant inductance loss is big, reach the problems such as harmonic wave that discrete pulse-width modulation causes; And quasi-resonance DC link inverter need preestablish one or several and the relevant threshold value of auxiliary switch control in inductive current; The generation of resonance just can reach the course of work of expection; These threshold value normal conditions are relevant with load current; This has brought difficulty with regard to giving the realization of circuit in full-load range, the control more complicated.
The 16th the 6th phase of volume of " electrotechnics journal " calendar year 2001 discloses " a kind of new dc bus parallel resonance zero voltage transition three-phase PWM voltage source inverter ".Shown in figure 11, this technology is added auxiliary resonance circuit 8 at DC link, and this circuit has increased by one by the dc bus switch S on the dc bus in traditional DC link inverter circuit
L, two auxiliary switch S of series connection in the other direction
AAnd S
B, the resonant network that constitutes of booster diode VD and resonant inductance Lr and capacitor C r, the auxiliary switch of all increases all has fly-wheel diode, when the inverter bridge device for power switching need move through reasonable control switch device S
A, S
B, S
L, make dc tache voltage resonance to zero, the inverter bridge device for power switching is accomplished switch motion during the DC link no-voltage groove, makes dc tache voltage resonance go up after switching process finishes.
Chinese patent 200610105134.5 discloses " a kind of resonance DC link soft-switching inverter circuit "; Shown in figure 12; This technology is added resonance auxiliary circuit 29 between DC power supply 1 and inverter bridge 4, comprise 3 auxiliary switches, 6 diodes, 3 electric capacity and 1 inductance; Diode D2, D3, D4, D5 connect successively, and the negative electrode of D2 connects the dc bus P1 utmost point, and the anode of a D2 and end of the capacitor C 1 and negative electrode of D3 links to each other, and the negative electrode of a D5 and end of the capacitor C 2 and anode of D4 links to each other, and the anode of D5 connects the N utmost point of dc bus; The other end of the negative electrode of D1 and capacitor C 2 joins, and connects the P2 utmost point of dc bus then, and the anode of D1 connects the N utmost point of dc bus; Auxiliary switch V2, V3 series connection, series connection point links to each other with inductance L r one end, links to each other another termination dc bus P1 utmost point of V2, the N utmost point of another termination dc bus of V3 with the anode of D3, the negative electrode of D4 simultaneously; After linking to each other, the other end of the other end of inductance L r and capacitor C 1 connects the P2 utmost point of dc bus; Auxiliary switch V1 two termination diode D6 two ends, the negative electrode of D6 meets the P1 of dc bus, and the anode of D6 connects the P2 utmost point of dc bus; Capacitor C r two is terminated at the P2 utmost point and the N utmost point of dc bus; The P1 utmost point connects the positive pole of DC power supply; The P2 utmost point connects the anode of inverter bridge; The N utmost point connects the negative pole of DC power supply and the negative terminal of inverter bridge; Control circuit connects auxiliary switch V1, V2, V3.
These two technology had both overcome big, the electromagnetic interference important disadvantages of conventional P WM inverter switching device loss, and have following advantage again: 1. all switches are ZVT (ZVS) or Zero Current Switch (ZCS); 2. resonance natural occurring does not need setting threshold; 3. the fly-wheel diode in the inverter bridge also is soft shutoff, has overcome reverse-recovery problems; 4. the used time of resonant process lacks; 5. can realize PWM control method etc.
But still there is deficiency in these technology: needs increase by three auxiliary switches in the resonance auxiliary circuit, and simultaneously, three auxiliary switches need three cover driver element and driving powers, have increased the complexity of system's fringe cost and control.
Summary of the invention
Technical problem to be solved by this invention is to above-mentioned deficiency of the prior art; Provide a kind of fringe cost low, be easy to Project Realization; Improve the operating efficiency and the power density of inverter, reduce electromagnetic interference, simplify the soft-switching inversion circuit of control method.
For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: a kind of soft-switching inversion circuit and control method thereof; It is characterized in that: comprise control circuit, DC power supply and direct current converted to the inverter bridge of alternating current; The output termination bleeder circuit of said DC power supply and supply power to inverter bridge through dc bus; Said inverter bridge and control circuit join; It is characterized in that: be connected with the resonance auxiliary circuit between said bleeder circuit and the inverter bridge, said resonance auxiliary circuit is made up of two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r, and said single-phase rectification bridge is made up of diode Dr1, Dr2, Dr3 and Dr4; A mid point that exchanges end and bleeder circuit of said single-phase rectification bridge joins; The P utmost point that another of said single-phase rectification bridge exchanges end and dc bus joins, and a dc output end of said single-phase rectification bridge and the end of auxiliary switch Tr join, and another dc output end of said single-phase rectification bridge and the end of inductance L r join; The other end of the other end of said auxiliary switch Tr and inductance L r joins; The end of said auxiliary switch V and the negative electrode of diode D all join with the positive pole of DC power supply, and the anode of the other end of said auxiliary switch V and diode D all joins with the P utmost point of dc bus, and the two ends of said capacitor C r join with the P utmost point of dc bus and the N utmost point of dc bus respectively; The P utmost point of said dc bus and the anode of inverter bridge join, and the N utmost point of said dc bus joins with the negative pole of DC power supply and the negative terminal of inverter bridge; Said resonance auxiliary circuit and control circuit joins and the signal dV that sent by control circuit and conducting and the shutoff of dTr control auxiliary switch V and Tr.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: said auxiliary switch V and Tr are the full-control type devices.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: said auxiliary switch V and Tr are power transistor, igbt, power field effect transistor or SPM.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: said diode D is fast recovery diode or high-frequency diode.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: said capacitor C r is made up of a plurality of electric capacity between the N utmost point of the P utmost point that is connected in parallel on dc bus and dc bus.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: said inverter bridge is H bridge or heterogeneous bridge.
The present invention also provides a kind of simple and practical, efficient is high, reliability is high soft-switching inversion circuit control method, it is characterized in that this method may further comprise the steps:
The voltage of step 3, the dc bus P utmost point remains zero, and the device for power switching in the inverter bridge is accomplished soft switch motion under the control of control circuit;
After device for power switching switch motion in step 4, the inverter bridge was accomplished, control circuit sent control signal and makes auxiliary switch Tr conducting, and resonance takes place for inductance L r and capacitor C r, and the voltage resonance of the dc bus P utmost point is risen;
The present invention compared with prior art has the following advantages:
1, used time of resonant process shorter, consumed power is less;
2, resonant network does not have the resonance threshold limitation;
3, the fly-wheel diode of inverter bridge has been realized soft shutoff, has overcome reverse-recovery problems;
4, can realize PWM control, the resonance auxiliary circuit has only two switches to make method simpler, is easy to Project Realization;
5, the resonance auxiliary circuit has only two switches, has reduced fringe cost, has improved reliability;
6, the voltage stress of auxiliary switch Tr is merely the half the of DC bus-bar voltage, helps device and selects and the further fringe cost that reduces;
7, can be used for alternating current motors such as induction machine that three-phase or heterogeneous bridge drive, permagnetic synchronous motor, brshless DC motor, can be used for the inductive load that the H bridge drives simultaneously;
8, inverter bridge main switch operation is ZVT (ZVS), resonance auxiliary circuit switch device be operating as ZVT (ZVS) or Zero Current Switch (ZCS), overcome the electromagnetic interference (EMI) problem and improved the operational efficiency of switch converters;
9, switch converters may operate in higher switching frequency, strengthened original system efficient, improved power density.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the circuit theory diagrams of soft-switching inversion circuit embodiments 1 of the present invention.
Fig. 2 is the equivalent circuit diagram of soft-switching inversion circuit embodiments 1 of the present invention.
Fig. 3 is the timing waveform of soft-switching inversion circuit embodiments 1 of the present invention.
Fig. 4 a is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern a of the present invention [t0～t1].
Fig. 4 b is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern b of the present invention [t1～t2].
Fig. 4 c is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern c of the present invention [t2～t3].
Fig. 4 d is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern d of the present invention [t3～t4].
Fig. 4 e is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern e of the present invention [t4～t5].
Fig. 4 f is the equivalent circuit diagram of soft-switching inversion circuit state transition period pattern f of the present invention [t5～t6].
Fig. 5 is the circuit theory diagrams of soft-switching inversion circuit embodiments 2 of the present invention.
Fig. 6 is the control flow chart of soft-switching inversion circuit embodiments 2 of the present invention.
Fig. 7 is the voltage U on the capacitor C r of soft-switching inversion circuit embodiments 2 of the present invention
CrWith the current i on the inductance L r
LrOscillogram.
Fig. 8 is the current waveform figure of the three-phase permanent brshless DC motor of soft-switching inversion circuit embodiments 2 of the present invention.
Fig. 9 is the auxiliary switch V voltage u of soft-switching inversion circuit embodiments 2 of the present invention
VOscillogram with the drive signal dV of auxiliary switch V.
Figure 10 is the current i of the auxiliary switch Tr of soft-switching inversion circuit embodiments 2 of the present invention
TrOscillogram with the drive signal dTr of auxiliary switch Tr.
Figure 11 is the circuit diagram of the resonance DC link soft-switching three-phase inverter of prior art 1.
Figure 12 is the circuit diagram of the resonance DC link soft-switching inverter circuit of prior art 2.
Description of reference numerals:
The 1-DC power supply; The 2-bleeder circuit; 3-resonance auxiliary circuit;
The 4-inverter bridge; The 5-inductive load; The 6-control circuit;
7-three-phase permanent brushless direct-current 8-auxiliary resonance circuit; 9-resonance auxiliary circuit two;
Motor;
10-inverter bridge two; The 11-motor.
Embodiment
A kind of soft-switching inversion circuit as shown in Figure 1; Comprise control circuit 6, DC power supply 1 and direct current converted to the inverter bridge 4 of alternating current; The output termination bleeder circuit 2 of said DC power supply 1 and give inverter bridge 4 power supplies through dc bus; Said inverter bridge 4 is joined with control circuit 6; It is characterized in that: be connected with resonance auxiliary circuit 3 between said bleeder circuit 2 and the inverter bridge 4, said resonance auxiliary circuit 3 is made up of two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r, and said single-phase rectification bridge is made up of diode Dr1, Dr2, Dr3 and Dr4; A mid point that exchanges end and bleeder circuit 2 of said single-phase rectification bridge joins; The P utmost point that another of said single-phase rectification bridge exchanges end and dc bus joins, and a dc output end of said single-phase rectification bridge and the end of auxiliary switch Tr join, and another dc output end of said single-phase rectification bridge and the end of inductance L r join; The other end of the other end of said auxiliary switch Tr and inductance L r joins; The end of said auxiliary switch V and the negative electrode of diode D all join with the positive pole of DC power supply 1, and the anode of the other end of said auxiliary switch V and diode D all joins with the P utmost point of dc bus, and the two ends of said capacitor C r join with the P utmost point of dc bus and the N utmost point of dc bus respectively; The P utmost point of said dc bus and the anode of inverter bridge 4 join, and the negative terminal of the N utmost point of said dc bus and the negative pole of DC power supply 1 and inverter bridge 4 joins; Said resonance auxiliary circuit 3 joins with control circuit 6 and the signal dV that sent by control circuit 6 and dTr control conducting and the shutoff of auxiliary switch V and Tr.
In the present embodiment, said auxiliary switch V and Tr are the full-control type devices.Said auxiliary switch V and Tr are power transistor (GTR), igbt (IGBT), power field effect transistor (MOSFET) or SPM (IPM); Like this; Switching circuit is directly controlled by control circuit fully, need not increase conducting or turn-off auxiliary circuit.Said diode D is fast recovery diode or high-frequency diode.Said capacitor C r is made up of a plurality of electric capacity between the N utmost point of the P utmost point that is connected in parallel on dc bus and dc bus; When a plurality of electric capacity were connected in parallel between the N utmost point of the P utmost point and dc bus of dc bus dispersedly, device for power switching can directly turn-off, owing to there is electric capacity to cushion the energy when turn-offing; Make to turn-off and be ZVT (ZVS) action; Only need resonance is taken place, produce the no-voltage groove, realize the conducting under inverter bridge 4 switch ZVT (ZVS) conditions.Said inverter bridge 4 is H bridge or heterogeneous bridge, and the H bridge is used to drive single-phase load, and heterogeneous bridge is used to drive multiphase load.
In the present embodiment, the DC power supply E that said DC power supply 1 adopts the battery strings parallel connection to produce; Said bleeder circuit 2 is formed by two capacitor C D1, CD2 serial connection, and the two ends of bleeder circuit 2 connect DC power supply 1; Described inverter bridge 4 is known three phase inverter bridge, and three limits and the inductive load 5 of said three phase inverter bridge join, the signal d that is sent by control circuit 6
SxConducting and the shutoff of device for power switching Sx (x value from 1 to 6) (x value from 1 to 6) control three phase inverter bridge; Said device for power switching Sx (x value from 1 to 6) is the full-control type device; Said device for power switching Sx (x value from 1 to 6) is power transistor (GTR), igbt (IGBT), power field effect transistor (MOSFET) or SPM (IPM), and the control signal dsx (x value from 1 to 6) that said device for power switching Sx (x value from 1 to 6) is sent by control circuit 6 controls its conducting and shutoff; Diode SDx in the said three phase inverter bridge (x value from 1 to 6) is fast recovery diode or high-frequency diode, and fast recovery diode and high-frequency diode not only have enough withstand voltage, and its reverse recovery time of describing frequency characteristic is enough short.
A kind of control method to above-mentioned soft-switching inversion circuit is controlled may further comprise the steps:
The voltage of step 3, the dc bus P utmost point remains zero, and the device for power switching in the inverter bridge 4 is accomplished soft switch motion under the control of control circuit 6;
After device for power switching switch motion in step 4, the inverter bridge 4 was accomplished, control circuit 6 sent control signal and makes auxiliary switch Tr conducting, and resonance takes place for inductance L r and capacitor C r, and the voltage resonance of the dc bus P utmost point is risen;
In order to further specify soft-switching inversion circuit control method of the present invention; Fig. 2 replaces Fig. 1 with equivalent electric circuit; Because the inductance of inductive load 5 is much larger than resonant inductance Lr; The load current of device for power switching on off state transition moment in the inverter bridge 4 can be thought constant-current source Io, and the device for power switching on off state transition moment in the inverter bridge 4, the diode SDx in the inverter bridge 4 (x value from 1 to 6) equivalence is fly-wheel diode TDi.Suppose that the device for power switching in the inverter bridge 4 need accomplish the switch motion from a kind of on off state to another kind of on off state; The timing waveform of an one of which switching process is as shown in Figure 3; Control circuit 6 blocks the drive signal dV of auxiliary switch V; The drive signal dTr of output auxiliary switch Tr, inductance L r and capacitor C r generation resonance make the voltage U of the dc bus P utmost point
CrDrop to zero, simultaneously, the current i on the inductance L r
LrAlso drop to zero; Control circuit 6 blocks the drive signal dTr of auxiliary switch Tr; Device for power switching in the inverter bridge 4 changes on off state under the inverter bridge 4 device for power switching drive signals of control circuit 6 outputs; After switching process finished, control circuit 6 was exported the drive signal dTr of auxiliary switch Tr, made the voltage U of the dc bus P utmost point
CrRise to DC power supply 1 voltage, the drive signal dV of control circuit 6 output auxiliary switch V, the current i on inductance L r
LrAfter dropping to zero, control circuit 6 blocks the drive signal dTr of auxiliary switch Tr, and the device for power switching in the inverter bridge 4 is accomplished the conversion from a kind of on off state to another kind of on off state.
The switch motion of concrete analysis Fig. 1 below, it is made up of 6 mode of operations, and Fig. 4 a-Fig. 4 f has provided soft-switching inversion circuit state transition period pattern equivalent electric circuit.
Pattern a [t0～t1] supposes that this is the initialization state of circuit shown in Fig. 4 a, auxiliary switch Tr breaks off, auxiliary switch V conducting, and DC power supply 1 provides electric current through auxiliary switch V to inverter bridge 4, and the electric current of establishing on the inductance L r is i
Lr, the voltage of the dc bus P utmost point is U
Cr, i is then arranged
Lr(t)=0, U
Cr(t)=E.
Pattern b [t1～t2] when t=t1, turn-offs auxiliary switch V shown in Fig. 4 b, because the voltage of capacitor C r can not suddenly change, be ZVT (ZVS) action so this turn-offs.The auxiliary switch of conducting simultaneously Tr is because inductive current i
LrCan not suddenly change, so this conducting is Zero Current Switch (ZCS) action; When t=t2, the voltage U of the dc bus P utmost point
CrResonance is zero, i.e. U
Cr(t)=0.
Pattern c [t2～t3] shown in Fig. 4 c, when t=t2, the voltage U of the dc bus P utmost point
CrDrop to zero, load current I
0Flow through fly-wheel diode TDi, simultaneously, inductive current i
LrAlso drop to zero, turn-off auxiliary switch Tr this moment, then auxiliary switch Tr is Zero Current Switch (ZCS) action; In t2～t3 stage, inverter bridge 4 fly-wheel diodes and load current constitute the loop, and be identical with known inverter operating state.In t2～t3 stage, dc bus P pole tension U
CrBe zero, the device for power switching in the inverter bridge 4 is accomplished ZVT (ZVS) action, and this section period can control, wait switch motion to finish after, begin to carry out dc bus P pole tension U
CrGo up.
Pattern d [t3～t4] is shown in Fig. 4 d, and when t=t3, Zero Current Switch (ZCS) action is conducting auxiliary switch Tr, then inductive current i down
LrLinear increasing, and power to the load through the device for power switching in the inverter bridge 4, the electric current linearity that flows through fly-wheel diode TDi is reduced, when t=t4, inductive current i
LrEquate with load current, make the soft shutoff of fly-wheel diode TDi.
Pattern e [t4～t6] shown in Fig. 4 e, when t=t4, inductive current i
LrEquate and continue to increase inductive current i with load current
LrA part and load current keep balance, and another part makes inductance L r and capacitor C r that natural resonance take place, and the voltage on the capacitor C r rises; When t=t5, inductive current i
LrReach maximum; In resonant process, dc bus P pole tension U
CrRise to DC power supply 1 voltage gradually, when t=t6, U
Cr(t6)=and E, diode D conducting has limited dc bus P pole tension U
CrFurther increase.
Pattern f [t6～t7] shown in Fig. 4 f, when t=t6, U
Cr(t6)=and E, so the charging of capacitor C r stops, conducting this moment auxiliary switch V is no-voltage (ZVS) switch motion; After the auxiliary switch V conducting, to the load supplemental current, simultaneously, half of DC power supply 1 voltage is added in inductance L r two ends, inductive current i to DC power supply 1 through auxiliary switch V
LrReduce rapidly.When t=t7, inductive current i
LrBe reduced to zero, after this load current is all provided by DC power supply 1, turn-offs auxiliary switch Tr this moment, and then auxiliary switch Tr is Zero Current Switch (ZCS) action.Circuit state is got back to pattern a [t0～t1] again.
As shown in Figure 5, a kind of soft-switching inversion circuit is provided, use it for three-phase permanent brshless DC motor 7 and drive.Present embodiment is on the basis of embodiment 1, changes inductive load 5 into concrete three-phase permanent brshless DC motor 7, and the circuit structure of remainder is identical with embodiment 1, and operation principle is identical with embodiment 1, repeats no more here.At this, mainly present embodiment has been carried out emulation.During emulation, three-phase permanent brshless DC motor 7 is operated in known star three-phase six states, and its parameter is: rated power 40W, rated voltage 24V, number of poles are 4, every phase winding resistance 0.95 Ω, every phase winding inductance 0.829mH.In the present embodiment, the parameter of resonance auxiliary circuit 3 is: capacitor C r=22nF, resonant inductance Lr=5uH.The voltage of known DC power supply 1 is 24V, and the carrier frequency of three phase inverter bridge is 20kHz.
According to operation principle of the present invention; Its control flow is as shown in Figure 6; Device for power switching in inverter bridge 4 need carry out PWM and turn-off when moving, and at the PWM trailing edge, control circuit 6 blocks the drive signal dV of auxiliary switch V; The drive signal dTr of output auxiliary switch Tr, inductance L r and capacitor C r resonance make the voltage U of the dc bus P utmost point
CrDrop to zero, simultaneously, the current i on the inductance L r
LrAlso drop to zero, control circuit 6 blocks the drive signal dTr of auxiliary switch Tr, the device for power switching that control circuit 6 turn-offs in the inverter bridge 4, and the device for power switching in the inverter bridge 4 forms continuous current circuit under the effect of current of electric; When the device for power switching in inverter bridge 4 need carry out the PWM turn-on action, at the PWM rising edge, the device for power switching in the control circuit 6 conducting inverter bridge 4, control circuit 6 is exported the drive signal dTr of auxiliary switch Tr, makes the voltage U of dc bus P level
CrResonance rises to supply voltage, and control circuit 6 is exported the drive signal dV of auxiliary switch V, the current i on inductance L r afterwards
LrWhen reducing to zero, the drive signal dTr that control circuit 6 blocks auxiliary switch Tr accomplishes one time the PWM process.
Actual effect is described below:
Fig. 7 for the present invention at the voltage of the capacitor C r of the auxiliary resonance unit 3 that 2 times emulation of embodiment obtains, the current waveform figure of inductance L r, as can be seen from the figure, its sequential with Fig. 3 is consistent.The phase current that Fig. 8 obtains in 2 times emulation of embodiment for the present invention, visible three-phase permanent brshless DC motor 7 is fully by 120 ° of star three-phase six state work.The auxiliary switch V voltage u that Fig. 9 obtains in 2 times emulation of embodiment for the present invention
VWith the drive signal dV of auxiliary switch V, can find out that auxiliary switch V is operated under ZVT (ZVS) condition.Figure 10 for the present invention in auxiliary switch Tr two ends current i that 2 times emulation of embodiment obtains
TrWith the drive signal dTr of auxiliary switch Tr, can find out that auxiliary switch Tr is operated in Zero Current Switch (ZCS) condition.
In sum, the present invention compared with prior art has the following advantages: 1. used time of resonant process shorter, consumed power is less; 2. resonant network does not have the resonance threshold limitation; 3. the fly-wheel diode of inverter bridge has been realized soft shutoff, has overcome reverse-recovery problems; 4. can realize PWM control, the auxiliary resonance circuit has only two switches to make method simpler, is easy to Project Realization; 5. the resonance auxiliary circuit has only two switches, has reduced fringe cost, has improved reliability; 6. the voltage stress of auxiliary switch Tr is merely the half the of DC bus-bar voltage, helps device and selects and the further fringe cost that reduces; 7. can be used for alternating current motors such as induction machine that three-phase or heterogeneous bridge drive, permagnetic synchronous motor, brshless DC motor, can be used for the inductive load that the H bridge drives simultaneously; 8. inverter bridge main switch operation is ZVT (ZVS), resonance auxiliary circuit switch device be operating as ZVT (ZVS) or Zero Current Switch (ZCS), overcome the EMI problem and improved the operational efficiency of switch converters.9. switch converters may operate in higher switching frequency, strengthened original system efficient, improved power density.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection range of technical scheme of the present invention.
Claims (6)
1. soft-switching inversion circuit control method; It is characterized in that; The soft-switching inversion circuit that this method adopts comprises control circuit (6), DC power supply (1) and direct current is converted to the inverter bridge (4) of alternating current; The output termination bleeder circuit (2) of said DC power supply (1) and give inverter bridge (4) power supply through dc bus, said inverter bridge (4) is joined with control circuit (6), is connected with resonance auxiliary circuit (3) between said bleeder circuit (2) and the inverter bridge (4); Said bleeder circuit (2) is made up of capacitor C D1 and capacitor C D2; The end of said capacitor C D1 and the end of capacitor C D2 join, and the positive pole of the other end of said capacitor C D1 and DC power supply (1) joins, and the negative pole of the other end of said capacitor C D2 and DC power supply (1) joins; Said resonance auxiliary circuit (3) is made up of two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r; Said single-phase rectification bridge is made up of diode Dr1, Dr2, Dr3 and Dr4; A link that exchanges end and capacitor C D1 and capacitor C D2 of said single-phase rectification bridge joins; The positive pole that another of said single-phase rectification bridge exchanges end and dc bus joins; A dc output end of said single-phase rectification bridge and the end of auxiliary switch Tr join; Another dc output end of said single-phase rectification bridge and the end of inductance L r join, and the other end of the other end of said auxiliary switch Tr and inductance L r joins, and the end of said auxiliary switch V and the negative electrode of diode D all join with the positive pole of DC power supply (1); The anode of the other end of said auxiliary switch V and diode D all joins with the positive pole of dc bus; The two ends of said capacitor C r join with the positive pole of dc bus and the negative pole of dc bus respectively, and the anode of the positive pole of said dc bus and inverter bridge (4) joins, and the negative terminal of the negative pole of the negative pole of said dc bus and DC power supply (1) and inverter bridge (4) joins; Said resonance auxiliary circuit (3) and control circuit (6) join and the signal dV that sent by control circuit (6) and dTr control conducting and the shutoff of auxiliary switch V and Tr, and said control method may further comprise the steps:
Step 1, when the device for power switching in the inverter bridge (4) need be from a kind of switch state to another kind of on off state; Control circuit (6) sends control signal to shift to an earlier date conducting auxiliary switch Tr and turn-offs auxiliary switch V simultaneously; Resonance takes place in inductance L r and capacitor C r, the voltage resonance of the dc bus P utmost point is descended, simultaneously; Current resonance on the inductance L r rises; Voltage resonance on the capacitor C r descends, and the voltage on capacitor C r drops to a half of DC power supply (1) voltage, and the electric current on the inductance L r begins to descend;
Step 2, when the voltage of the dc bus P utmost point drops to zero, the electric current on the inductance L r also drops to zero, at this moment, control circuit (6) sends control signal turn-offs auxiliary switch Tr;
The voltage of step 3, the dc bus P utmost point remains zero, and the device for power switching in the inverter bridge (4) is accomplished soft switch motion under the control of control circuit (6);
After device for power switching switch motion in step 4, the inverter bridge (4) was accomplished, control circuit (6) sent control signal and makes auxiliary switch Tr conducting, and resonance takes place for inductance L r and capacitor C r, and the voltage resonance of the dc bus P utmost point is risen;
Step 5, when the voltage of the dc bus P utmost point rises to DC power supply (1) voltage, control circuit (6) sends control signal and makes auxiliary switch V conducting, the electric current on the inductance L r descends rapidly;
Step 6, after the electric current on the inductance L r drops to zero, control circuit (6) sends control signal turn-offs auxiliary switch Tr, the device for power switching in the inverter bridge (4) is accomplished the conversion from a kind of on off state to another kind of on off state.
2. according to the described a kind of soft-switching inversion circuit control method of claim 1, it is characterized in that: said auxiliary switch V and Tr are the full-control type devices.
3. according to the described a kind of soft-switching inversion circuit control method of claim 2, it is characterized in that: said auxiliary switch V and Tr are igbt or power field effect transistor.
4. according to the described a kind of soft-switching inversion circuit control method of claim 1, it is characterized in that: said diode D is fast recovery diode or high-frequency diode.
5. according to the described a kind of soft-switching inversion circuit control method of claim 1, it is characterized in that: said capacitor C r is made up of a plurality of electric capacity between the negative pole of positive pole that is connected in parallel on dc bus and dc bus.
6. according to the described a kind of soft-switching inversion circuit control method of claim 1, it is characterized in that: said inverter bridge (4) is H bridge or heterogeneous bridge.
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| CN201010603936A CN102097970B (en) | 2010-12-24 | 2010-12-24 | Soft switching inverting circuit and control method thereof |
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| CN201010603936A CN102097970B (en) | 2010-12-24 | 2010-12-24 | Soft switching inverting circuit and control method thereof |
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| CN103983891B (en) | 2014-05-30 | 2018-10-09 | 台达电子企业管理（上海）有限公司 | The short trouble detection device and method of inverter circuit |
| DE102015113247A1 (en) * | 2015-08-11 | 2017-02-16 | Sma Solar Technology Ag | Inverter with a discharge capacitor and photovoltaic system comprising an inverter |
| CN105743375B (en) * | 2016-04-29 | 2018-08-24 | 天津工业大学 | A kind of more level power topological structures of switched reluctance machines |
| EP3667884B1 (en) * | 2018-12-14 | 2022-11-16 | Delta Electronics (Thailand) Public Co., Ltd. | Burst mode routine for switched mode power converter |
| CN109600896A (en) * | 2018-12-29 | 2019-04-09 | 北京航空航天大学 | A kind of microminiature dielectric barrier discharge plasma exciter |
| CN110212778B (en) * | 2019-06-28 | 2024-03-22 | 南京航空航天大学 | Non-contact single-tube resonant converter |
| CN112187020B (en) * | 2020-09-27 | 2022-08-19 | 申彦峰 | Switching semiconductor device parallel circuit and control method thereof |
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| CN100438304C (en) * | 2006-12-07 | 2008-11-26 | 西北工业大学 | A soft switch reversion conversion circuit for the resonance DC step |
| CN100490296C (en) * | 2007-02-06 | 2009-05-20 | 西北工业大学 | A resonance electrode soft switch reversion circuit special for brushless DC motor |
| CN100574080C (en) * | 2007-10-18 | 2009-12-23 | 西北工业大学 | Be applied to the control method of the resonance electrode soft switch reversion circuit of brshless DC motor |
| CN201904737U (en) * | 2010-12-24 | 2011-07-20 | 西安科技大学 | Resonant DC link inverter |
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