CN105071658B - Reduce the control method of two-way forward converter switch tube voltage spike and circulation - Google Patents

Abstract

The invention discloses a kind of control method for effectively reducing two-way forward converter switch tube voltage spike and circulation, the operating mode mainly for two-way forward converter from the lateral high-pressure side transimission power of low pressure, low-side switch pipe Q_SR1And Q_SR2Low level complementary switch controls, and the common ON time of high level be present, high side switch pipe Q is then turned off always；Q_g、Q_{g_SR1}And Q_{g_SR2}Switching tube Q, Q are corresponded to respectively_SR1And Q_SR2Driving control signal, it is open-minded that high level corresponds to switching tube, and low level corresponds to switching tube shut-off, in a switch periods, Q_{g_SR1}High level time be less than 1/2 switch periods, Q_{g_SR2}High level time be more than 1/2 switch periods, Q_gIt is always maintained at low level.The present invention realizes simply, can effectively reduce two-way forward converter switch tube voltage, current spike and circulation, improve the security, efficiency and power density of converter, and increase transimission power.

Description

Reduce the control method of two-way forward converter switch tube voltage spike and circulation

Technical field

The invention belongs to DC-to-dc transformation of electrical energy technical field, is specifically related to a kind of two-way forward converter of reduction The control method of switch tube voltage spike and circulation.

Background technology

Bidirectional DC-DC converter is the dual quadrant operation of DC converter, the transmitted in both directions of energy can be achieved, functionally Equivalent to two Unidirectional direct-current converters, it is typical " dual-use " equipment.Needing the occasion of bi-directional energy flow can be big Amplitude mitigates volume, weight and the cost of system.Due to the advantage, bidirectional DC-DC converter is in airplane power source, new energy It is used widely in the fields such as electricity generation system, electric automobile, uninterrupted power source, energy-storage system.

According to whether electrical isolation, bidirectional DC-DC converter can be divided into non-isolation type and isolation type bidirectional DC-DC converter Two major classes.Typical non-isolation type reversible transducer mainly include two-way Buck-Boost, Buck/Boost, Cuk, SEPIC and The converters such as Zeta, typical isolation type bidirectional transducer mainly include two-way normal shock, flyback, recommend, half-bridge and full-bridge etc. become Parallel operation.In middle low power and require the application scenario of electrical isolation, two-way forward converter is because of its circuit structure (including main electricity Road, drive circuit and control circuit) simply, cost is low, and receives significant attention.

Due to the limitation of transformer winding technique, the leakage inductance of actual circuit medium/high frequency transformer is inevitable.Double Into the application process of forward converter, due to the presence of leakage inductance, its switching tube is carved form larger voltage in meeting when off Spike, especially during the lateral high-pressure side transimission power of low pressure, it may appear that the inductance (filter inductance of two different electric currents And leakage inductance) cascade process, should during due to voltage spikes it is very high, and be difficult to absorb or absorbing circuit loss it is very big, be unfavorable for out Pipe safety and efficient work are closed, the volume and efficiency of whole circuit are also unfavorable for improving.

The too high due to voltage spikes of switching tube has seriously limited the application of two-way forward converter, and greatly reduces Its performance.For the problem, there is presently no find very effective solution method.

The content of the invention

For above-mentioned technical problem, the present invention proposes one kind and effectively reduces two-way forward converter switch tube voltage spike With the control method of circulation.The control method of the present invention is mainly for the lateral high-pressure side transimission power of two-way forward converter low pressure Operating mode, can not only greatly reduce the due to voltage spikes of switching tube and the circulation of converter, increase transimission power, but also can be real The no-voltage or Zero Current Switch of existing controlled switch pipe, greatly improve the efficiency and reliability of two-way forward converter.Due to opening The reduction of tube voltage spike and the raising of transducer effciency are closed, the switching frequency of two-way forward converter also can further improve, Its volume and cost can also be reduced further.

Technical scheme is as follows：

A kind of control method for reducing two-way forward converter switch tube voltage spike and circulation, it is characterised in that：Low Under the operating mode for pressing lateral high-pressure side transimission power, two-way forward converter low-pressure side inductive energy storage switching tube Q_SR2Energy is released with inductance Switching tube Q_SR1Low level complementary switch controls, and the common ON time of high level be present, high side switch pipe Q is then turned off always；

In a preferable technical scheme, Q_g、Q_{g_SR1}And Q_{g_SR2}Switching tube Q, Q are corresponded to respectively_SR1And Q_SR2Driving control Signal processed, it is open-minded that high level corresponds to switching tube, and low level corresponds to switching tube shut-off.

In a preferable technical scheme, in a switch periods, Q_{g_SR1}High level time be less than 1/2 switch week Phase, Q_{g_SR2}High level time be more than 1/2 switch periods, Q_gThen it is always maintained at low level.

In a preferable technical scheme, Q_SR2And Q_SR1Low level complementary switch controls, and high level be present and lead jointly The logical time, refer in each switch periods, in driving control signal Q_{g_SR2}At the time of low level becomes high level, drive control letter Number Q_{g_SR1}Continue to keep high level to become low level, then, Q afterwards for a period of time_{g_SR2}Keep high level, Q_{g_SR1}Keep low level, Until Q_{g_SR1}At the time of low level becomes high level, Q_{g_SR2}High level is kept to become low level, then, Q afterwards for a period of time_{g_SR2} Keep low level, Q_{g_SR1}High level is kept, until Q_{g_SR2}At the time of low level becomes high level, start next switch periods.

In a preferable technical scheme, driving control signal Q_{g_SR2}And Q_{g_SR1}The time of high level jointly be present i.e. For switching tube Q_SR2And Q_SR1Dead time.

In a preferable technical scheme, the two-way forward converter includes high side power V_HV, high-pressure side filtering Inductance L_HV, low-pressure side filter capacitor C_HV, high frequency transformer T_r, reset diode D_R, high side switch pipe Q, low-pressure side is released to open Close pipe Q_SR1, low-pressure side energy storage switching tube Q_SR2, low-pressure side filter inductance L_LV, low-pressure side filter capacitor C_LVWith low-side power V_LV。

In a preferable technical scheme, high frequency transformer T_rIncluding high-pressure side winding N₁, low-pressure side winding N₂, reset Winding N₃, magnetizing inductance L_mWith leakage inductance L_k。

In a preferable technical scheme, switching tube Q includes its body diode D_b1With parasitic capacitance C_b1, switching tube Q_SR1 Include its body diode D_sb1With parasitic capacitance C_sb1, switching tube Q_SR2Include its body diode D_sb2With parasitic capacitance C_sb2。

In a preferable technical scheme, high side power V_HVPositive pole be connected to high-pressure side filter inductance L_HVOne End, L_HVThe other end be respectively connecting to high-pressure side filter capacitor C_HVPositive pole, N₁The Same Name of Ends and N of winding₃The different name end of winding, N₁The different name end of winding is connected to switching tube Q drain electrode, N₃Motor Winding Same Name of Ends is connected to reset diode D_RNegative electrode, D_RSun Pole is respectively connecting to V_HVNegative pole and Q source electrode, N₂Motor Winding Same Name of Ends is respectively connecting to magnetizing inductance L_mOne end and leakage inductance L_k's One end, leakage inductance L_kThe other end be respectively connecting to switching tube Q_SR2Source electrode and low-pressure side filter inductance L_LVOne end, L_LVIt is another End is respectively connecting to low-pressure side filter capacitor C_LVPositive pole and power supply V_LVPositive pole, N₂The different name end of winding is respectively connecting to excitation Inductance L_mThe other end and switching tube Q_SR1Drain electrode, Q_SR1Source electrode be respectively connecting to Q_SR2Source electrode, C_LVNegative pole and power supply V_LVNegative pole.

In a preferable technical scheme, body diode and parasitic capacitance in parallel are connected to drain electrode and the source electrode of switching tube Both ends, D_b1Negative electrode and C_b1One end be connected to Q drain electrode, D together_b1Anode and C_b1The other end be connected to Q source together Pole, D_sb1Negative electrode and C_sb1One end be connected to Q together_SR1Drain electrode, D_sb1Anode and C_sb1The other end be connected to together Q_SR1Source electrode, D_sb2Negative electrode and C_sb2One end be connected to Q together_SR2Drain electrode, D_sb2Anode and C_sb2The other end together It is connected to Q_SR2Source electrode.

In a preferable technical scheme, the operating mode of the lateral high-pressure side transimission power of low pressure corresponds to low-side power V_LVTo High side power V_HVThe situation of transimission power.

The advantages of control method of the present invention, is：

(1) two-way forward converter switch tube voltage and current spike are effectively reduced, improve converter security and can By property,；

(2) reduce volume and the loss of absorbing circuit, improve the power density and efficiency of converter；

(3) no-voltage and Zero Current Switch of partial switch pipe, the Sofe Switch of diode are realized, and reduces drive loss, Further improve conversion efficiency；

(4) reduce converter circulation, increase system transimission power.

Figure of description

Fig. 1 is the main circuit diagram of two-way forward converter；

Fig. 2 is after converter shown in Fig. 1 uses control method of the present invention, under the lateral high-pressure side transimission power operating mode of low pressure Key operation waveforms；

Fig. 3 is t in Fig. 2₀The operation mode figure of two-way forward converter before moment；

Fig. 4 is t in Fig. 2₀~t₁The operation mode figure of period two-way forward converter；

Fig. 5 is t in Fig. 2₁~t₂The operation mode figure of period two-way forward converter；

Fig. 6 is t in Fig. 2₂~t₃The operation mode figure of period two-way forward converter；

Fig. 7 is t in Fig. 2₃~t₄The operation mode figure of period two-way forward converter；

Fig. 8 is t in Fig. 2₄~t₅The operation mode figure of period two-way forward converter；

Fig. 9 is t in Fig. 2₅~t₆The operation mode figure of period two-way forward converter；

Figure 10 is t in Fig. 2₆~T_sThe operation mode figure of period two-way forward converter；

Figure 11 is under existing control method, and two-way forward converter shown in Fig. 1 is in the lateral high-pressure side transimission power work of low pressure Key operation waveforms under condition；

Figure 12 be two-way forward converter shown in Fig. 1 under the lateral high-pressure side transimission power operating mode of low pressure, Fig. 2 is respectively adopted With the simulation comparison waveform of control method shown in Figure 11.

Embodiment

One kind that the present invention is explained with reference to Figure of description 1~12 reduces two-way forward converter switching tube The control method of due to voltage spikes and circulation.

Fig. 1 is the main circuit diagram of two-way forward converter.As shown in figure 1, the two-way forward converter includes high-pressure side Power supply V_HV, high-pressure side filter inductance L_HV, low-pressure side filter capacitor C_HV, high frequency transformer T_r, reset diode D_R, high side switch Pipe Q, low-pressure side are released can switching tube Q_SR1, low-pressure side energy storage switching tube Q_SR2, low-pressure side filter inductance L_LV, low-pressure side filter capacitor C_LVWith low-side power V_LV.Wherein, N₁、N₂And N₃Respectively T_rHigh-pressure side winding, low-pressure side winding and reset winding, L_mWith L_kRespectively T_rConvert the magnetizing inductance and leakage inductance of low-pressure side, D_b1、D_sb1And D_sb2Respectively switching tube Q, Q_SR1And Q_SR2Body Diode, C_b1、C_sb1And C_sb2Respectively switching tube Q, Q_SR1And Q_SR2Parasitic capacitance.

Fig. 2 shows under control method of the present invention that two-way forward converter is in the lateral high-pressure side transimission power operating mode of low pressure Under key operation waveforms.Wherein Q_g、Q_{g_SR1}And Q_{g_SR2}Respectively it is delivered to switching tube Q, Q_SR1And Q_SR2Driving control signal, It is open-minded that high level corresponds to switching tube, and low level corresponds to switching tube shut-off, i_MFor static exciter inductance L_mElectric current, characterize transformation The flux change situation of device, i_{L_LV}For low-pressure side filter inductance L_LVElectric current, i_LkFor transformer leakage inductance electric current, including magnetizing inductance Electric current i_MAnd N₂Coil current i_N2, V_N2For N₂Winding, i.e. magnetizing inductance L_mThe voltage at both ends.As seen from Figure 2, in low-pressure side To under the transimission power operating mode of high-pressure side, two-way forward converter high side switch pipe Q turns off control, low-side switch pipe always Q_SR1And Q_SR2Low level complementary switch controls, and the dead time turned on jointly be present.So-called Q_SR1And Q_SR2Low level it is complementary Switch control, refers to driving control signal Q_{g_SR1}And Q_{g_SR2}Will not occur low level, such as Q simultaneously_{g_SR1}For low level, then Q_{g_SR2} One is set to high level, such as Q_{g_SR2}For low level, then Q_{g_SR1}One is set to high level.So-called Q_SR1And Q_SR2During the dead band turned on jointly Between, refer to driving control signal Q_{g_SR2}At the time of low level becomes high level, driving control signal Q_{g_SR1}Continue to keep high level Become low level after a period of time, equally, in Q_{g_SR1}At the time of low level becomes high level, Q_{g_SR2}When keeping one section of high level Between after become low level.So, Q_{g_SR1}And Q_{g_SR2}Will there are the high level of certain time, Q in this time jointly_{g_SR1}With Q_{g_SR2}Simultaneously turn on, as shown in the shadow region in Fig. 2.

With reference to Fig. 3~Fig. 9, two-way forward converter shown in Fig. 1 is introduced in the lateral high-pressure side transimission power work of low pressure Under condition, using the main operational principle of control method shown in Fig. 2.

Fig. 3 is t in Fig. 2₀The operation mode figure of two-way forward converter before moment.Reference picture 2, t₀Before moment, switch Pipe Q and Q_SR2Shut-off, Q_SR1Conducting, low-pressure side energy pass through transformer T_rDischarged to high-pressure side, from low-pressure side conversion to high-pressure side Electric current i_HV, pass through L_HVAnd C_HVWave filter, the body diode D of composition_b1And N₁Winding flows into power supply V_HV, realize low-pressure side V_LVTo High-pressure side V_HVPower transmission.In high-pressure side, due to L_HVInductance value is general all larger, and the electric current flowed through can be considered as constant It is constant, therefore, now N₁Winding both end voltage can be approximated to be V_HV, and Same Name of Ends (band " ") is just, different name end is negative, is answered Position diode D_RNegative electrode is then V to anode voltage_HV(1+N₁/N₃), D_RCut-off.In low-pressure side, now inductance L_LVWith leakage inductance L_kString Connection, two inductive currents are equal, i.e. i_{L_LV}=i_Lk, pass through N₁The conversion of winding voltage, it can also obtain N₂The voltage of winding, in other words Magnetizing inductance L_mThe voltage at both ends is V_HVN₂/N₁＞ 0, excitation inductance current i_MIncrease, transformer T_rNormal magnetization, in addition, now It is added in series inductance L_LVAnd L_kThe voltage at both ends is V_LV-V_HVN₂/N₁＜ 0, electric current i_{L_LV}And i_LkLinear decline.

Fig. 4 is t in Fig. 2₀~t₁The operation mode figure of period two-way forward converter.In this period, switching tube Q shut-offs, body Diode D_b1Conducting, Q_SR1And Q_SR2Conducting, transformer N₂Winding voltage-V_HVN₂/N₁It is applied directly to leakage inductance L_kBoth ends, voltage V_LVThen It is applied directly to inductance L_LVBoth ends, due to L_kInductance value very little, electric current i_LkIt is rapid to decline, until being equal to excitation inductance current i_M, it is approximate It is zero, inductive current i_{L_LV}Then increase, due to L_LVInductance value is larger, it is believed that inductance L_LVElectric current be held essentially constant, etc. Imitate in constant-current source.Electric current i_LkDrop to i_MWhen, transformer N₁、N₂And N₃Winding voltage is also approximately at zero, body diode D_b1Bear anti- Pressure shut-off, excitation inductance current i_MIt is held essentially constant, until t₁Moment, Q_SR1Shut-off, the process terminate.As can be seen that t₁When Go at quarter to turn off Q_SR1, it is possible to achieve its no-voltage and zero-current switching.

Fig. 5 is t in Fig. 2₁~t₂The operation mode figure of period two-way forward converter.In this period, switching tube Q shut-offs, Q_SR1Shut-off, Q_SR2Conducting, body diode D_b1Naturally turn off, electric capacity C_sb1And C_b1Charging, N₂、N₁And N₃Winding bears backward voltage, That is Same Name of Ends is negative that different name end is just exciting current i_MReduce, transformer magnetic reversal, until N is arrived in conversion₃The voltage of winding is big In V_HVWhen, reset diode D_RNaturally turn on, electric capacity C_b1Voltage clamp to 2V_HV, the process terminates.

Fig. 6 is t in Fig. 2₂~t₃The operation mode figure of period two-way forward converter.In this period, switching tube Q and Q_SR1Close It is disconnected, Q_SR2Conducting, reset diode D_RConducting, N₃The voltage clamp of winding is in-V_HV, excitation inductance current i_MIt is linear to reduce, until It is zero, reset diode D_RNaturally turn off, reseting procedure terminates.

Fig. 7 is t in Fig. 2₃~t₄The operation mode figure of period two-way forward converter.In this period, switching tube Q and Q_SR1Close It is disconnected, Q_SR2Conducting, reset diode D_RShut-off, electric capacity C_sb1And C_b1Electric discharge, transformer N₁、N₂And N₃The backward voltage of winding declines, i_MAnd i_LkReversely increase, because magnetizing inductance value is very big, reverse increased current value very little, until C_b1Tension discharge to V_HV, C_sb1Tension discharge to zero, transformer N₂、N₁And N₃The voltage of winding also drops to zero, until switching tube Q_SR1It is open-minded, the process Terminate.As can be seen that t₃~t₄Process is switching tube Q_SR1No-voltage and zero current turning-on get ready.

Fig. 8 is t in Fig. 2₄~t₅The operation mode figure of period two-way forward converter.In this period, switching tube Q shut-offs, Q_SR1And Q_SR2Conducting, transformer N₁、N₂And N₃Winding voltage is zero, leakage inductance L_kElectric current i_Lk=i_M, inductance L_LVElectric current can still work as As constant-current source.

Fig. 9 is t in Fig. 2₅~t₆The operation mode figure of period two-way forward converter.In this period, switching tube Q and Q_SR2Close It is disconnected, Q_SR1Conducting, inductance L_LVElectric current on the one hand to leakage inductance L_kTransfer, on the other hand gives electric capacity C_sb2Charging.In addition, during this period Interior, on high-tension side electric current i is arrived in conversion_HVWill also be to electric capacity C_b1Discharged, transformer N₁、N₂And N₃Winding voltage gradually rises, Until N₁Winding voltage is increased to V_HV, body diode D_b1Naturally turn on, high-pressure side starts to receive the power of low-pressure side conveying.In t₆ Moment, inductance L_LVElectric current be transferred completely into L_kIt is interior, i.e. i_Lk=i_{L_LV}.As can be seen that due to L_kThe changes delta i, C of electric current_sb2Two End can produce corresponding voltage change Δ V_sb2, Δ V_sb2Correspond to switching tube Q_SR2Due to voltage spikes, specially Δ V_sb2It is proportional to Δi.Due to L_kInitial current is zero, therefore corresponding Δ i=i_{L_LV}。

Figure 10 is t in Fig. 2₆~T_sThe operation mode figure of period two-way forward converter.In this period, switching tube Q and Q_SR2 Shut-off, Q_SR1Conducting, body diode D_b1Conducting, and i_{L_LV}=i_Lk, concrete operating principle and t₀The same before moment, low pressure is lateral High-pressure side transmission power.

Figure 11 shows under existing control method that two-way forward converter is under the lateral high-pressure side transimission power operating mode of low pressure Key operation waveforms, wherein Q_g、Q_{g_SR1}And Q_{g_SR2}It is similarly and is delivered to switching tube Q, Q_SR1And Q_SR2Driving control signal, i_M For static exciter inductance L_mElectric current, i_{L_LV}For low-pressure side filter inductance L_LVElectric current, i_LkFor transformer leakage inductance electric current, V_N2For N₂The voltage at winding both ends.Unlike Fig. 2, in control method shown in Figure 11, driving control signal Q_gAnd Q_{g_SR1}It is all height Level, be all low level, i.e. switching tube Q and Q_SR1With opening with pass, in addition, in two kinds of control methods shown in Fig. 2 and Figure 11 Driving control signal is just the same, i.e. Q_{g_SR1}And Q_{g_SR2}It is still complementary for low level, and high level dead time simultaneously be present. It is emphasized that the Q in Figure 11_{g_SR1}And Q_{g_SR2}With the Q in Figure 12_{g_SR1}And Q_{g_SR2}With identical switch periods, high level Retention time, low level retention time and dead time.As seen from Figure 11, in t₄~t₅Period, flow through leakage inductance L_kElectricity Flow i_LkReversely increase to some current value, i.e.-I shown in figure_pk.Therefore in the t shown in Figure 11₅~t₆Period, i.e. switching tube Q_SR2During shut-off, leakage inductance L_kIn curent change Δ i=i_{L_LV}+I_pk, compared with the Δ i=i in control method shown in Fig. 2_{L_LV}It is bigger, Higher due to voltage spikes Δ V can thus be corresponded to_sb2.In addition, compare the i in Fig. 2 and Figure 11_LkKnowable to waveform, the electric current meeting in Figure 11 Reverse flow, the circulation of converter certainly will be increased, reduce transimission power.

Figure 12 be two-way forward converter shown in Fig. 1 under the lateral high-pressure side transimission power operating mode of low pressure, Fig. 2 is respectively adopted The simulation comparison waveform of existing control method shown in shown control method of the present invention and Figure 11.The corresponding present invention of Figure 12 left sides waveform Control method, the right waveform correspond to Current limited Control method, and the waveform in the right and left figure from top to down is all respectively low-pressure side filter Ripple inductance L_LVElectric current i_{L_LV}, high-pressure side filter inductance L_HVElectric current i_{L_HV}, leakage inductance L_kElectric current i_LkWith switching tube Q_SR2Hourglass source electrode electricity Corrugating V_{ds_QSR2}.As can be seen that the output current i of the control method low-pressure side of the present invention_{L_LV}With on high-tension side input current i_{L_HV}All bigger, transimission power is bigger, in addition, the V under control method of the present invention_{ds_QSR2}Voltage spikes are also significantly lower than existing Control method, effectively increase the security of switching tube and the efficiency of converter.It should be noted that two kinds of controlling parties in Figure 12 Simulation waveform under method, corresponding two-way forward converter main circuit parameter is just the same, and corresponding drive circuit is just the same, Driving control signal Q_{g_SR1}、Q_{g_SR2}Switch periods and switch periods in high level hold time, low level is held time With dead time and just the same.

Main circuit parameter corresponding to Figure 12 simulation waveforms is：Low-pressure side voltage V_LV=3.5V, high side voltage V_HV=21V, The Transformer Winding number of turn is respectively N₁=N₃=21 circles, N₂=11 circles, magnetizing inductance L_m=1mH, leakage inductance L_k=100nH, high-pressure side Filter inductance L_HV=120 μ H, filter capacitor C_HV=4700 μ F, low-pressure side filter inductance L_LV=120 μ H, filter capacitor C_LV= 9400 μ F, Q, Q_SR1And Q_SR2For preferable N-channel MOS FET, parasitic capacitance C in parallel_b1=C_sb1=C_sb2=1nF, D_RRecover to be fast Diode, setting reverse recovery time are 100nS；

Circuit parameter is moved corresponding to Figure 12 simulation waveforms is：Switching frequency f_s=10kHz, switch periods T_s=100 μ s, extremely Area's time 1 μ s, Q_SR2High-level retention time is 75 μ s, low level retention time 25 μ s, Q_SR1High-level retention time is 27 μ s, The low level retention time is 73 μ s.

Claims (10)

1. A kind of 1. control method for reducing two-way forward converter switch tube voltage spike and circulation, it is characterised in that：In low pressure Under the operating mode of lateral high-pressure side transimission power, two-way forward converter low-pressure side inductive energy storage switching tube Q_SR2With low-pressure side inductance Releasing can switching tube Q_SR1Low level complementary switch controls, and the common ON time of high level be present, high side switch pipe Q is then closed always It is disconnected；Q_g、Q_{g_SR1}And Q_{g_SR2}Switching tube Q, Q are corresponded to respectively_SR1And Q_SR2Driving control signal, it is open-minded that high level corresponds to switching tube, Low level corresponds to switching tube shut-off.
2. A kind of 2. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 1 Method, it is characterised in that：In one switch periods, Q_{g_SR1}High level time be less than 1/2 switch periods, Q_{g_SR2}High level Time is more than 1/2 switch periods, Q_gThen it is always maintained at low level.
3. A kind of 3. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 1 Method, it is characterised in that：Q_SR2And Q_SR1Low level complementary switch controls, and the common ON time of high level be present, refers to each open Close in the cycle, in driving control signal Q_{g_SR2}At the time of low level becomes high level, driving control signal Q_{g_SR1}Continue to keep high Level becomes low level, then, Q afterwards for a period of time_{g_SR2}Keep high level, Q_{g_SR1}Low level is kept, until Q_{g_SR1}Low level becomes At the time of into high level, Q_{g_SR2}High level is kept to become low level, then, Q afterwards for a period of time_{g_SR2}Keep low level, Q_{g_SR1}Protect High level is held, until Q_{g_SR2}At the time of low level becomes high level, start next switch periods.
4. A kind of 4. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 1 Method, it is characterised in that：Driving control signal Q_{g_SR2}And Q_{g_SR1}The time that high level jointly be present is switching tube Q_SR2And Q_SR1's Dead time.
5. A kind of 5. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 1 Method, it is characterised in that：The two-way forward converter includes high side power V_HV, high-pressure side filter inductance L_HV, high-pressure side filtering Electric capacity C_HV, high frequency transformer T_r, reset diode D_R, high side switch pipe Q, low-pressure side inductance are released can switching tube Q_SR1, low-pressure side Inductive energy storage switching tube Q_SR2, low-pressure side filter inductance L_LV, low-pressure side filter capacitor C_LVWith low-side power V_LV。
6. A kind of 6. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 5 Method, it is characterised in that：High frequency transformer T_rIncluding high-pressure side winding N₁, low-pressure side winding N₂, reset winding N₃, magnetizing inductance L_mWith Leakage inductance L_k。
7. A kind of 7. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 5 Method, it is characterised in that：Switching tube Q includes its body diode D_b1With parasitic capacitance C_b1, switching tube Q_SR1Include its body diode D_sb1 With parasitic capacitance C_sb1, low-pressure side inductive energy storage switching tube Q_SR2Include its body diode D_sb2With parasitic capacitance C_sb2。
8. A kind of 8. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 5 Method, it is characterised in that：High side power V_HVPositive pole be connected to high-pressure side filter inductance L_HVOne end, L_HVThe other end difference It is connected to high-pressure side filter capacitor C_HVPositive pole, C_HVNegative pole and reset diode D_RAnode connection, N₁The Same Name of Ends of winding And N₃The different name end of winding, N₁The different name end of winding is connected to switching tube Q drain electrode, N₃Motor Winding Same Name of Ends, which is connected to, resets two poles Pipe D_RNegative electrode, D_RAnode be respectively connecting to V_HVNegative pole and Q source electrode, N₂Motor Winding Same Name of Ends is respectively connecting to magnetizing inductance L_mOne end and leakage inductance L_kOne end, leakage inductance L_kThe other end be respectively connecting to switching tube Q_SR2Drain electrode and low-pressure side filter inductance L_LVOne end, L_LVThe other end be respectively connecting to low-pressure side filter capacitor C_LVPositive pole and power supply V_LVPositive pole, N₂Winding it is different Name end is respectively connecting to magnetizing inductance L_mThe other end and switching tube Q_SR1Drain electrode, Q_SR1Source electrode be respectively connecting to Q_SR2Source Pole, C_LVNegative pole and power supply V_LVNegative pole.
9. A kind of 9. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 7 Method, it is characterised in that：Body diode and parasitic capacitance in parallel are connected to drain electrode and the source electrode both ends of switching tube, D_b1Negative electrode and C_b1One end be connected to Q drain electrode, D together_b1Anode and C_b1The other end be connected to Q source electrode, D together_sb1Negative electrode and C_sb1One end be connected to Q together_SR1Drain electrode, D_sb1Anode and C_sb1The other end be connected to Q together_SR1Source electrode, D_sb2's Negative electrode and C_sb2One end be connected to Q together_SR2Drain electrode, D_sb2Anode and C_sb2The other end be connected to Q together_SR2Source electrode.
10. A kind of 10. controlling party for reducing two-way forward converter switch tube voltage spike and circulation according to claim 1 Method, it is characterised in that：The operating mode of the lateral high-pressure side transimission power of low pressure corresponds to low-side power V_LVTo high side power V_HVTransmission The situation of power.