CN102097970A - Soft switching inverting circuit and control method thereof - Google Patents
Soft switching inverting circuit and control method thereof Download PDFInfo
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- CN102097970A CN102097970A CN2010106039365A CN201010603936A CN102097970A CN 102097970 A CN102097970 A CN 102097970A CN 2010106039365 A CN2010106039365 A CN 2010106039365A CN 201010603936 A CN201010603936 A CN 201010603936A CN 102097970 A CN102097970 A CN 102097970A
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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 may 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 by 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 early the resonance DC annulus inverter that proposes exists that switching voltage stress is higher, the resonant inductance loss is big, and the problems such as harmonic wave that cause of discrete pulse-width modulation; 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 ".As shown in figure 11, this technology is added auxiliary resonance circuit 8 in 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 by 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 finished 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 ", as 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 zero voltage switch (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: need to increase by three auxiliary switches in the resonance auxiliary circuit, 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 at 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 solution used in the present invention 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 is converted to the inverter bridge of alternating current, the output termination bleeder circuit of described DC power supply and power to inverter bridge by dc bus, described inverter bridge and control circuit join, it is characterized in that: be connected with the resonance auxiliary circuit between described bleeder circuit and the inverter bridge, described resonance auxiliary circuit is by two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r constitute, described single-phase rectification bridge is by diode Dr1, Dr2, Dr3 and Dr4 constitute, a mid point that exchanges end and bleeder circuit of described single-phase rectification bridge joins, the P utmost point that another of described single-phase rectification bridge exchanges end and dc bus joins, a dc output end of described single-phase rectification bridge and the end of auxiliary switch Tr join, another dc output end of described single-phase rectification bridge and the end of inductance L r join, the other end of the other end of described auxiliary switch Tr and inductance L r joins, the end of described auxiliary switch V and the negative electrode of diode D all join with the positive pole of DC power supply, the anode of the other end of described auxiliary switch V and diode D all joins with the P utmost point of dc bus, the two ends of described 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 described dc bus and the anode of inverter bridge join, and the N utmost point of described dc bus joins with the negative pole of DC power supply and the negative terminal of inverter bridge; Described resonance auxiliary circuit and control circuit joins and the signal dV that sent by control circuit and the turn-on and turn-off of dTr control auxiliary switch V and Tr.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: described auxiliary switch V and Tr are the full-control type devices.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: described auxiliary switch V and Tr are power transistor, igbt, power field effect transistor or Intelligent Power Module.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: described diode D is fast recovery diode or high-frequency diode.
Above-mentioned a kind of soft-switching inversion circuit is characterized in that: described capacitor C r is made 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: described inverter bridge is H bridge or heterogeneous bridge.
The present invention also provides a kind of control method of simple and practical, efficient is high, reliability is high soft-switching inversion circuit, 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 finished soft switch motion under the control of control circuit;
After device for power switching switch motion in step 4, the inverter bridge was finished, 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;
Step 5, when the voltage of the dc bus P utmost point rises to DC power supply voltage, control circuit sends control signal and makes auxiliary switch V conducting, the electric current on the inductance L r descends rapidly;
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 restriction of resonance threshold value;
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 only is half 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 zero voltage switch (ZVS), resonance auxiliary circuit switch device be operating as zero voltage switch (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.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
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 soft-switching inversion circuit state transition period pattern a[t0～t1 of the present invention] equivalent circuit diagram.
Fig. 4 b is soft-switching inversion circuit state transition period pattern b[t1～t2 of the present invention] equivalent circuit diagram.
Fig. 4 c is soft-switching inversion circuit state transition period pattern c[t2～t3 of the present invention] equivalent circuit diagram.
Fig. 4 d is soft-switching inversion circuit state transition period pattern d[t3～t4 of the present invention] equivalent circuit diagram.
Fig. 4 e is soft-switching inversion circuit state transition period pattern e[t4～t5 of the present invention] equivalent circuit diagram.
Fig. 4 f is soft-switching inversion circuit state transition period pattern f[t5～t6 of the present invention] equivalent circuit diagram.
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 both end 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 is converted to the inverter bridge 4 of alternating current, the output termination bleeder circuit 2 of described DC power supply 1 and give inverter bridge 4 power supplies by dc bus, described inverter bridge 4 is joined with control circuit 6, it is characterized in that: be connected with resonance auxiliary circuit 3 between described bleeder circuit 2 and the inverter bridge 4, described resonance auxiliary circuit 3 is by two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r constitute, described single-phase rectification bridge is by diode Dr1, Dr2, Dr3 and Dr4 constitute, a mid point that exchanges end and bleeder circuit 2 of described single-phase rectification bridge joins, the P utmost point that another of described single-phase rectification bridge exchanges end and dc bus joins, a dc output end of described single-phase rectification bridge and the end of auxiliary switch Tr join, another dc output end of described single-phase rectification bridge and the end of inductance L r join, the other end of the other end of described auxiliary switch Tr and inductance L r joins, the end of described 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 described auxiliary switch V and diode D all joins with the P utmost point of dc bus, the two ends of described 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 described dc bus and the anode of inverter bridge 4 join, and the negative terminal of the N utmost point of described dc bus and the negative pole of DC power supply 1 and inverter bridge 4 joins; Described resonance auxiliary circuit 3 joins with control circuit 6 and the signal dV that sent by control circuit 6 and the turn-on and turn-off of dTr control auxiliary switch V and Tr.
In the present embodiment, described auxiliary switch V and Tr are the full-control type devices.Described auxiliary switch V and Tr are power transistor (GTR), igbt (IGBT), power field effect transistor (MOSFET) or Intelligent Power Module (IPM), like this, switching circuit is directly controlled by control circuit fully, need not increase conducting or turn-off auxiliary circuit.Described diode D is fast recovery diode or high-frequency diode.Described capacitor C r is made 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 are connected in parallel between the N utmost point of the P utmost point of dc bus and dc bus dispersedly, device for power switching can directly turn-off, because the energy when having electric capacity to cushion shutoff, make to turn-off and be zero voltage switch (ZVS) action, only need resonance is taken place, produce the no-voltage groove, realize the conducting under inverter bridge 4 switch zero voltage switch (ZVS) conditions.Described 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, described DC power supply 1 adopts the battery strings DC power supply E that produces in parallel; Described bleeder circuit 2 is formed by two capacitor C D1, CD2 serial connections, 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 described three phase inverter bridge join, the signal d that is sent by control circuit 6
SxThe turn-on and turn-off of device for power switching Sx (x value from 1 to 6) (x value from 1 to 6) control three phase inverter bridge; Described device for power switching Sx (x value from 1 to 6) is the full-control type device, described device for power switching Sx (x value from 1 to 6) is power transistor (GTR), igbt (IGBT), power field effect transistor (MOSFET) or Intelligent Power Module (IPM), and the control signal dsx (x value from 1 to 6) that described device for power switching Sx (x value from 1 to 6) is sent by control circuit 6 controls its turn-on and turn-off; Diode SDx in the described 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 finished 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 finished, 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;
In order to further specify the control method of soft-switching inversion circuit 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, 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 device for power switching in the inverter bridge 4 need finish the switch motion from a kind of on off state to another kind of on off state, the timing waveform of an one switching process 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, resonance takes place in inductance L r and capacitor C r, makes 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 finishes, control circuit 6 is exported the drive signal dTr of auxiliary switch Tr, makes 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 finished 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] shown in Fig. 4 a, suppose that this is the initialization state of circuit, auxiliary switch Tr disconnects, auxiliary switch V conducting, 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] shown in Fig. 4 b, when t=t1, turn-off auxiliary switch V, because the voltage of capacitor C r can not suddenly change,, this is zero voltage switch (ZVS) action so turn-offing.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 finished zero voltage switch (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] shown in Fig. 4 d, 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 by 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, provide a kind of soft-switching inversion circuit, used 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 herein.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 as shown in Figure 6, device for power switching in inverter bridge 4 need carry out PWM and turn-off when moving, 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 finishes the PWM process one time.
Actual effect is as 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 both end 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, auxiliary switch V is operated under zero voltage switch (ZVS) condition as can be seen.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, auxiliary switch Tr is operated in Zero Current Switch (ZCS) condition as can be seen.
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 restriction of resonance threshold value; 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 only is half 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 zero voltage switch (ZVS), resonance auxiliary circuit switch device be operating as zero voltage switch (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 imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection range of technical solution of the present invention according to the technology of the present invention essence.
Claims (7)
1. soft-switching inversion circuit, it is characterized in that: comprise 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 described DC power supply (1) and give inverter bridge (4) power supply by dc bus, described inverter bridge (4) is joined with control circuit (6), it is characterized in that: be connected with resonance auxiliary circuit (3) between described bleeder circuit (2) and the inverter bridge (4), described resonance auxiliary circuit (3) is by two auxiliary switch V and Tr, a single-phase rectification bridge, a capacitor C r, 1 diode D and 1 inductance L r constitute, described single-phase rectification bridge is by diode Dr1, Dr2, Dr3 and Dr4 constitute, a mid point that exchanges end and bleeder circuit (2) of described single-phase rectification bridge joins, the P utmost point that another of described single-phase rectification bridge exchanges end and dc bus joins, a dc output end of described single-phase rectification bridge and the end of auxiliary switch Tr join, another dc output end of described single-phase rectification bridge and the end of inductance L r join, the other end of the other end of described auxiliary switch Tr and inductance L r joins, the end of described 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 described auxiliary switch V and diode D all joins with the P utmost point of dc bus, the two ends of described capacitor C r join with the P utmost point of dc bus and the N utmost point of dc bus respectively, the anode of the P utmost point of described dc bus and inverter bridge (4) joins, and the negative pole of the N utmost point of described dc bus and DC power supply (1) and the negative terminal of inverter bridge (4) join; Described resonance auxiliary circuit (3) and control circuit (6) join and the signal dV that sent by control circuit (6) and the turn-on and turn-off of dTr control auxiliary switch V and Tr.
2. according to the described a kind of soft-switching inversion circuit of claim 1, it is characterized in that: described auxiliary switch V and Tr are the full-control type devices.
3. according to the described a kind of soft-switching inversion circuit of claim 2, it is characterized in that: described auxiliary switch V and Tr are power transistor, igbt, power field effect transistor or Intelligent Power Module.
4. according to the described a kind of soft-switching inversion circuit of claim 1, it is characterized in that: described diode D is fast recovery diode or high-frequency diode.
5. according to the described a kind of soft-switching inversion circuit of claim 1, it is characterized in that: described capacitor C r is made 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.
6. according to the described a kind of soft-switching inversion circuit of claim 1, it is characterized in that: described inverter bridge (4) is H bridge or heterogeneous bridge.
7. the control method of a soft-switching inversion circuit is characterized in that this 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, 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 finished 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 finished, 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 finished the conversion from a kind of on off state to another kind of on off state.
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