CN107947590A - A kind of switching capacity two-way DC converter single supply integrated driving and control method - Google Patents

A kind of switching capacity two-way DC converter single supply integrated driving and control method Download PDF

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Publication number
CN107947590A
CN107947590A CN201711319484.6A CN201711319484A CN107947590A CN 107947590 A CN107947590 A CN 107947590A CN 201711319484 A CN201711319484 A CN 201711319484A CN 107947590 A CN107947590 A CN 107947590A
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voltage
power tube
power
capacitance
diode
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CN107947590B (en
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张岩
丁恺诚
曾鹏翔
刘进军
聂程
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Xian Jiaotong University
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Xian Jiaotong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of switching capacity two-way DC converter single supply integrated driving and control method, the invention dexterously combines main circuit switch pipe working status, boostrap circuit is formed using diode and capacitance, driving voltage is provided for each switching tube, so as to use single isolated power supply module for power supply.The driving chip of MOSFET is simple in structure and is easily integrated, and the power module isolated includes inverter circuit, high frequency transformer and the secondary side rectification circuit of primary side, occupies the major part of drive circuit cost and volume.It is proposed by the present invention to be suitable for the high-gain two-way DC converter single supply drive circuit based on switched capacitor network, help to reduce drive circuit cost, improve power density.

Description

A kind of switching capacity two-way DC converter single supply integrated driving and control method
Technical field
The invention belongs to the application of new energy distributed power generation field energy storage converter, and in particular to a kind of switching capacity is double To DC converter single supply integrated driving and control method.
Background technology
New energy distributed generation technology using photovoltaic, wind-powered electricity generation, fuel cell as representative develops rapidly, for optimizing China Energy resource structure, realizes economy, the sustainable development of environment has important strategic importance.Energy-storage system of accumulator is as a kind of energy Source buffer cell, can effectively improving regenerative resource, there are fluctuation, intermittent adverse effect to power grid transmission power. In energy storage converter, two-way DC converter is to undertake the key that storage battery energy is adjusted to high voltage dc bus power bi-directional Role, on the one hand, when generation of electricity by new energy amount is more than network load demand, energy unnecessary on busbar is become through step-down type dc Parallel operation charges a battery, on the other hand, when generation of electricity by new energy amount is less than workload demand, the electricity in storage battery is boosted DC converter feeds back to power grid, realizes the effect of peak load shifting.In general, considering the situation of storage battery series characteristic and safety Under, port voltage may be no more than 48V, and the voltage class of typical DC microgrid mainly has 200V, 270V, 400V and 540V It is several.Therefore, above-mentioned DC converter removes and needs to meet energy in bidirectional flow, it is also necessary to has higher voltage gain.
Traditional DC converter, acceptor's circuit parasitic parameter and controller performance influence, though duty cycle reach close to 0 or 1 limiting condition, it is also difficult to which there is higher voltage gain.Power tube turns within the extremely short time, and bears relatively large Voltage, current stress, serious switching loss and switching noise certainly will be caused, efficiency significantly reduces.Coupling inductance and switch Capacitance network is to realize non-isolated high-gain DC conversion technical way at present.Switched capacitor network is skilful by switching Multiple capacitance charged in parallels are realized wonderfully, afterwards discharged in series again, improve converter output voltage.Become with other high-gain DCs The technology of changing is compared, and switching capacity inductance network type has that efficient, power density is big, is easy to modular significant advantage, in Have a good application prospect in small-power type energy storage converter.
Typical switched capacitor network high-gain DC converter topology is as shown in Figure 1.Compared to Traditional DC converter, Based on the DC converter of switched capacitor network in high-gain lifting/voltage reducing occasion, help to reduce the voltage stress of switching device With the demand of passive element.To further improve voltage gain, it is more that multiple fundamental voltage gains expansion units compositions can be introduced Unit switch capacitance network high-gain DC converter, as shown in Figure 2.Usual 2~3 units can meet above application field Close the demand of voltage gain.Under identical voltage gain, on the one hand multiple-unit converter reduces power semiconductor device and single Capacitance voltage stress, on the other hand by reducing duty cycle of boosting, reduces input current ripple and magnetic element demand.In addition, Multicell switch capacitance network flexible design, according to voltage gain demand, can adjust the quantity of elementary cell.
Switched capacitor network high-gain DC converter shown in Fig. 1 introduces the switching device of multiple not common sources, therefore needs Will respective independent power module offer driving voltage.Typical drive circuit design is as shown in block diagram 3, when driving 3 is not common , it is necessary to 3 isolated form driving powers during the switching device of source electrode.Especially for multiple-unit high-gain DC converter shown in Fig. 2, Drive circuit needs to provide an isolated power supply for each MOSFET.In MOSFET drive circuits, the letter of driving chip structure List and it is easily integrated, and the driving power isolated includes inverter circuit, high frequency transformer and the secondary side rectification circuit of primary side, significantly Add the cost and volume of drive circuit.
The content of the invention
Object of the present invention is to provide switching capacity two-way DC converter single supply integrated driving and control always Method, simplify the high-gain two-way DC converter drive circuit based on switched capacitor network, realize single supply power supply it is low into Originally, miniaturization modular event driven design.
To achieve these goals, the present invention is achieved by the following scheme：
A kind of switching capacity two-way DC converter single supply integrated driving, including inverter main circuit and drive circuit,
N number of power tube S is included in inverter main circuitjWith N-1 DC capacitor Ck, 1≤j≤N, 1≤k≤N-1, wherein N The source electrode of a power tube and drain electrode, which are sequentially connected, connects composition cascaded structure, and adjacent any power tube working status is complementary；It is any Capacitance CkUpper tube S in the power tube of two series connection is connected in parallel on respectivelyk+1Source electrode and down tube SkDrain electrode both ends, 1≤k≤N-1；
Drive circuit includes N number of driving chip, a DC-DC isolated power supplies module, N number of electric capacity of voltage regulation CPiWith N-1 two Pole pipe Di, 1≤i≤N；The gate pole output terminal v of wherein each driving chipgiRespectively through the resistance R that overdrivesgMeet power tube SiDoor Pole, the negative terminal v of driving chip gate drive voltagesiMeet power tube SiSource electrode, DC voltage-stabilizing capacitance CPiConnect driving chip outlet side Positive and negative both ends vdiAnd vsiBetween；Diode DjMeet the two driving chip driving voltage anode v closed ondjAnd vd(j+1)Between.
As a further improvement on the present invention, diode D2、D3…DNVoltage stress be respectively capacitance C1、 C2…CN-1。
As a further improvement on the present invention, the gate capacitance value of bootstrap capacitor meets：
Wherein：QgFor power tube gate charge, VCpkTo drive capacitance voltage, εmaxFor maximum capacitor voltage set in advance Drop coefficient.
A kind of control method of switching capacity two-way DC converter single supply integrated driving, comprises the following steps：
When converter works normally, the complementary conducting of two power tubes of arbitrary neighborhood, includes two kinds of operating modes：
Pattern 1：PWM=1,At this time, odd number power tube S1、S3、S5…Sj, open-minded, j is odd number, even number power Pipe S2、S4、S6…SkShut-off, k is even number；
Pattern 2：PWM=1,At this time, power tube S1、S3、S5…SjShut-off, j is odd number；Power tube S2、S4、 S6…SkOpen-minded, k is even number；
As power tube S1When opening, DC voltage-stabilizing capacitance CP1Through resistance RgGive power tube S1Gate pole charges, and through diode D2 With power tube S1To for the second driving chip DC voltage-stabilizing capacitance CP2Power, at this time power tube S2Shut-off, diode D3Bear anti- Pressure cut-off, power tube S3It is open-minded, DC voltage-stabilizing capacitance CP3Through resistance RgGive power tube S3Gate pole is powered, and through diode D4And work( Rate pipe S3To for the 4th driving chip electric capacity of voltage regulation CP4Charging, and so on；As power tube S1During shut-off, diode D2Bear anti- Pressure cut-off, power tube S2It is open-minded, DC voltage-stabilizing capacitance CP2Through resistance RgGive power tube S2Gate pole charges, and through diode D3And work( Rate pipe S2To for the 3rd driving chip electric capacity of voltage regulation CP3Power supply, S3Shut-off, diode D2Back-pressure cut-off is born, and so on.
As a further improvement on the present invention, comprise the following steps that：
It is assumed that respectively bootstrapping capacitance voltage is zero in initial time drive circuit, and when inputting PWM=1, all even number power Pipe turns off, and the output of the first driving chip is provided with reference to high level by isolated power supply, power tube S1Smoothly conducting；Remaining odd number power Pipe due on corresponding bootstrap capacitor voltage be zero and can not open；Power tube S1Conducting is so that this moment power tube S2Source electrode Potential and power tube S1Source potential it is equal, therefore diode D2Forward bias turns on, DC voltage-stabilizing capacitance CP1It is steady to direct current Voltage capacitance CP2Charge to DC voltage-stabilizing capacitance C rapidlyP2Both end voltage is isolated power supply output voltage, is subsequent time power tube S2 Open and prepare；Afterwards, when inputting PWM=0, the shut-off of all odd number power tubes, due to during PWM=1, DC voltage-stabilizing Capacitance CP2From DC voltage-stabilizing capacitance CP1Obtain energy storage and keep certain voltage, therefore the output of the second driving chip refers to high level Shi Shunli opens power tube S2, remaining even number power tube can not realize conducting due to no-voltage on corresponding bootstrap capacitor, similar , power tube S2Conducting is so that this moment power tube S3Source potential and power tube S2It is equal, therefore diode D3Forward bias Put conducting, DC voltage-stabilizing capacitance CP2To DC voltage-stabilizing capacitance CP3It is equal to charge to two capacitance voltages, is subsequent time power tube S3 Offer high level cut-in voltage；Repeat the above steps, when the circuit reaches steady state, approximate isolation is obtained on each bootstrap capacitor The voltage of power supply output；
During stable state, the voltage of all bootstrap capacitors is approximately the voltage of isolated power supply module, in power stage circuit, Suo Youqi The source potential of number power tube immobilizes, and is corresponding capacitance voltage in main circuit；The source potential of all even number power tubes is Float, switch with the cycle of circuit operating pattern and change；As PWM=1, all odd number power tubes are both turned on, all idols Number power tube SkSource potential be equal to its adjacent low level odd number power tube Sk-1Source potential, the bootstrap capacitor of odd bits CP(k-1)To adjacent high-order bootstrap capacitor CP(k)Charging；As PWM=0, all even number power tubes are both turned on, all even number work( Rate pipe SkSource potential be equal to its adjacent high-order odd number power tube Sk+1Source potential, even bit bootstrap capacitor CP(k)To adjacent High-order bootstrap capacitor CP(k+1)Charging.
Compared with prior art, the invention has the advantages that：
Two-way DC converter single supply drive circuit of the present invention, dexterously with reference to main circuit power tube working status, profit Boostrap circuit is formed with diode and capacitance, driving voltage is provided for each power tube, so as to use single isolated power supply mould Block is powered.MOSFET driving chips are simple in structure and are easily integrated, and the power module isolated includes inverter circuit, the height of primary side Frequency power transformer and secondary side rectification circuit, occupy the major part of drive circuit cost and volume.The present invention by introduce diode- Condenser network network, with reference to the conducting channel design driven circuit of MOSFET, realizes the single supply power supply to multiple MOSFET；This The a kind of of invention proposition is suitable for the high-gain two-way DC converter single supply drive circuit based on switched capacitor network, helps In reducing drive circuit cost, power density is improved.
When converter works normally, the complementary conducting of two power tubes of arbitrary neighborhood, is driving the control method of the present invention Under two kinds of operating modes of dynamic circuit, the output capacitance Cp of isolated power supply1Dexterously sequentially complete and high-pressure side MOFET is driven Chip exports the power supply of lateral capacitance, realizes the single supply power supply of more MOSFET cascaded structures.
Brief description of the drawings
Fig. 1 a are a kind of high-gain two-way DC converter main circuit based on switched capacitor network；
Fig. 1 b are a kind of high-gain two-way DC converter main circuit based on switched capacitor network；
Fig. 1 c are a kind of high-gain two-way DC converter main circuit based on switched capacitor network；
Fig. 2 a are a kind of multicell switch capacitance network high-gain two-way DC converter main circuit；
Fig. 2 b are a kind of multicell switch capacitance network high-gain two-way DC converter main circuit；
Fig. 2 c are a kind of multicell switch capacitance network high-gain two-way DC converter main circuit；
Fig. 3 is existing switched capacitor network high-gain DC converter driving circuit structure schematic diagram (3 power tubes)；
Fig. 4 a are single supply driving circuit structure schematic diagram of the present invention (3 switches)；
Fig. 4 b are single supply driving circuit structure schematic diagram (N number of switch) of the present invention；
Fig. 5 a are the drive circuit simulation waveform one that Fig. 1 c converters use single supply drive scheme；
Fig. 5 b are the drive circuit simulation waveform two that Fig. 1 c converters use single supply drive scheme；
Fig. 5 c are the drive circuit simulation waveform three that Fig. 1 c converters use single supply drive scheme；
Fig. 5 d are the drive circuit simulation waveform four that Fig. 1 c converters use single supply drive scheme；
Fig. 5 e are the drive circuit simulation waveform five that Fig. 1 c converters use single supply drive scheme；
Fig. 5 f are the drive circuit simulation waveform six that Fig. 1 c converters use single supply drive scheme；
Fig. 6 a are the main circuit simulation waveform one that Fig. 1 c converters use single supply drive scheme；
Fig. 6 b are the main circuit simulation waveform two that Fig. 1 c converters use single supply drive scheme；
Fig. 6 c are the main circuit simulation waveform three that Fig. 1 c converters use single supply drive scheme；
Fig. 6 d are the main circuit simulation waveform four that Fig. 1 c converters use single supply drive scheme；
Fig. 7 a use the experimental waveform a power tube driving voltage waveforms of single supply drive scheme, b master for Fig. 1 c converters Circuit inductance electric current, output voltage, power tube voltage and current oscillogram one；
Fig. 7 b use the experimental waveform a power tube driving voltage waveforms of single supply drive scheme, b master for Fig. 1 c converters Circuit inductance electric current, output voltage, power tube voltage and current oscillogram two.
Embodiment
The present invention will be further described in detail below in conjunction with the accompanying drawings.
The key idea of the present invention is to utilize diode and capacity cell, with reference to main circuit switch device design of operating modes Drive circuit, dexterously the capacitance to driving power provides charge circuit, and then reduces the demand of isolation drive power supply.
As shown in figures 4 a and 4b, a kind of high-gain two-way DC converter single supply driving based on switched capacitor network Circuit, including inverter main circuit and drive circuit, include N number of MOSFET power tubes S in inverter main circuitj(1≤j≤N) With N-1 DC capacitor Ck(1≤k≤N-1), wherein N number of MOSFET power tubes source electrode and drain electrode, which are linked in sequence, forms tandem junction Structure, adjacent any power tube (MOSFET) working status are complementary；Any capacitance CkIt is connected in parallel on respectively in two Series power pipes Upper tube Sk+1Source electrode and down tube SkDrain electrode both ends (1≤k≤N-1).Invention is by introducing diode-condenser network Network, with reference to the conducting channel design driven circuit of power tube, realizes the single supply power supply to multiple power tubes；
Specific single supply drive circuit main feature is as follows：
Drive circuit includes N number of driving chip, a DC-DC isolated power supply module, N number of electric capacity of voltage regulation CPi(1≤i≤N) With N-1 diode Di(1≤i≤N)；The gate pole output terminal v of wherein each driving chipgiRespectively through the resistance R that overdrivesgConnect power Pipe SiGate pole (1≤i≤N), the negative terminal v of driving chip gate drive voltagesiMeet power tube SiSource electrode (1≤i≤N), direct current is steady Voltage capacitance CPiMeet the positive and negative both ends v of driving chip outlet sidediAnd vsiBetween (1≤i≤N), provide driving voltage for it；Two poles Pipe DjTo meet close on two driving chip driving voltage anode vdjAnd vd(j+1)Between；
When converter works normally, the complementary conductings of two MOSFET of arbitrary neighborhood, include two kinds of operating modes, pattern 1： PWM=1,At this time, S1、S3、S5…Sj(j is odd number) open-minded, S2、S4、 S6…Sk(k is even number) turns off and pattern 2：PWM=1,At this time, S1、S3、S5…Sj(j is odd number) turns off, S2、S4、S6…Sk(k is even number) is open-minded.Work as S1Open When logical, CP1Through resistance RgTo S1Gate pole charges, and through diode D2And S1To for MOSFET driving chip #2 electric capacity of voltage regulation CP2For Electricity, at this time S2Shut-off, diode D3Bear back-pressure cut-off, S3It is open-minded, electric capacity of voltage regulation CP3Through RgTo S3Gate pole is powered, and through two poles Pipe D4And S3To for driving chip #4 electric capacity of voltage regulation CP4Charging, and so on.Work as S1During shut-off, D2Bear back-pressure cut-off, S2Open It is logical, electric capacity of voltage regulation CP2Through resistance RgTo S2Gate pole charges, and through diode D3And S2To for driving chip #3 electric capacity of voltage regulation CP3For Electricity, S3Shut-off, diode D2Back-pressure cut-off is born, and so on.Under two kinds of operating modes of drive circuit, isolated power supply Output capacitance Cp1D2The power supply to high-pressure side MOFET driving chips output lateral capacitance is dexterously sequentially completed, is realized more The single supply power supply of MOSFET cascaded structures.
Diode D2、D3…DNVoltage stress be respectively capacitance C1、C2…CN-1。
Bootstrap capacitor should provide enough gate charges and ensure that MOSFET is quickly open-minded, and maintain enough gate poles to open electricity Pressure.Gate capacitance value meets：
Wherein：QgFor MOSFET gate charges, VCpkTo drive capacitance voltage, εmaxFor maximum capacitor voltage set in advance Drop coefficient.
With reference to shown in Fig. 4 a and Fig. 4 b, present invention also offers the control method of the circuit, comprise the following steps that：
It is assumed that respectively bootstrapping capacitance voltage is zero in initial time drive circuit.When input pwm signal is 1 (PWM=of logic 1) when, all even number power tube shut-offs.MOSFET driving chips #1 outputs are provided with reference to high level by isolated power supply, therefore S1It is suitable Profit conducting.Remaining odd number power tube due on corresponding bootstrap capacitor voltage be zero and can not open.S1Conducting is so that this moment S2 Source potential and S1Source potential it is equal, i.e. capacitance CP2Negative polarity end and DC voltage-stabilizing capacitance CP1The electricity such as negative polarity end Gesture, therefore diode D2Forward bias turns on, DC voltage-stabilizing capacitance CP1To DC voltage-stabilizing capacitance CP2Charge to C rapidlyP2Both ends electricity Press as isolated power supply output voltage, be subsequent time S2Open and prepare.
Afterwards, when it is logical zero (PWM=0) to input pwm signal, all odd number power tube shut-offs.Due in the PWM=1 phases Between, CP2From CP1Obtain energy storage and simultaneously keep certain voltage, therefore when driving chip #2 outputs refer to high level can smoothly open S2。 Remaining even number power tube can not realize conducting due to no-voltage on corresponding bootstrap capacitor.Similar, S2When conducting causes this Carve S3Source potential and S2It is equal, i.e. capacitance CP3Negative polarity end and CP2Negative polarity end equipotential, therefore D3Forward bias Conducting, CP2To CP3It is equal to charge to two capacitance voltages, is subsequent time S3Offer high level cut-in voltage.Repeat above-mentioned step Suddenly, when the circuit reaches steady state, the voltage of approximate isolated power supply output, thus each power can be obtained on each bootstrap capacitor MOSFET's smoothly is switched on and off being protected.
During stable state, the voltage of all bootstrap capacitors is approximately the voltage of isolated power supply module.In power stage circuit, Suo Youqi Number power tube (S1、S3...) source potential immobilize, be main circuit in corresponding capacitance voltage；All even number power tube (S2、 S4...) source potential be float, with circuit operating pattern cycle switch and change.As PWM=1, all odd number work( Rate pipe is both turned on, all even number power tube SkSource potential be equal to its adjacent low level odd number power tube Sk-1Source potential, very The bootstrap capacitor C of numerical digitP(k-1)To adjacent high-order bootstrap capacitor CP(k)Charging.As PWM=0, all even number power tubes are led It is logical, all even number power tube SkSource potential be equal to its adjacent high-order odd number power tube Sk+1Source potential, even bit bootstrapping Capacitance CP(k)To adjacent high-order bootstrap capacitor CP(k+1)Charging.
Bootstrap capacitor should provide sufficiently large gate charge QgEnsure that MOSFET is quickly open-minded, and maintain sufficiently high gate pole Voltage ensures that MOSFET power tubes are in the conduction state.According to drive circuit works principle, the mistake of MOSFET power tubes is being opened Cheng Zhong, corresponding capacitance is through driving resistance to charge to gate pole, and capacitance voltage is from Vc_maxDecline Vc_min, when MOSFET power tubes turn on When, gate current very little, capacitance voltage maintains approximately constant.After MOSFET power tubes turn off, by power supply and previous stage capacitance Charge to capacitance present.
To make driving chip high-level output voltage reliable and stable in actual circuit, pressure drop Δ V should be reduced as far as possible.Definition Voltage Drop coefficient ε is the ratio that Δ V and capacitance steady state voltage drop in capacitance voltage.
Capacitance pressure drop Δ V and MOSFET gate charges Qg meets：
Qg=C Δs V (3)
Combine (2) and (3), capacitance value meets：
Wherein：εmaxFor maximum capacitor Voltage Drop coefficient set in advance.
To verify above-mentioned new single supply drive circuit and theory analysis, The present invention gives a design example.
As shown in fig. 4 a, as illustrated in figure 1 c, parameter is as follows for main circuit for drive circuit：vin=50V, Po=500W, vo= 400V,fs=100kHz, vCP1=12V, L=100uH, Lf=1mH, C1=C2=50uF, Co=50uF, RL=320 Ω.
Fig. 5 a- Fig. 5 f, provide using single supply drive circuit proposed by the present invention, the driving voltage v of each MOSFETGs1, vGs2,vGs3, diode voltage vD2,vD3,vGs3With capacitance voltage vCP2, it is multiple MOSFET power devices to effectively realize single supply Part provides stable driving voltage and ensures that it is reliably turned on and off.
Fig. 6 a- Fig. 6 d, provide using single supply drive circuit of the present invention, main circuit inductive current, MOSFET switch electricity Pressure, electric current and output voltage waveforms.
Fig. 7 a- Fig. 7 b, provide Fig. 1 c main circuits vin=48V, vo=200V, fs=100kHz, vCP1=12V, L=1mH, Lf=5mH, C1=C2=50uF, Co=50uF, RLExperimental waveform under=100 Ω operating modes.Emulation and experimental result are divided with theoretical Analyse basically identical.
Isolated power supply occupies the major part of power device driving plate cost and volume.The invention discloses one kind to be suitable for The single supply drive circuit design method of switched capacitor network high-gain DC converter effectively simplifies drive circuit design With the demand of isolated power supply, in the case that especially switching device is more in main circuit, help to reduce driving plate device cost, Improve power density.
It is last that, it is necessary to illustrate, above-described embodiment is merely illustrative of the technical solution of the present invention, and not to embodiment party The restriction of formula.For those of ordinary skill in the field, without departing from the spirit and scope of the present invention, can be Other various forms of changes and improvements are carried out on the basis of described above, these changes and improvements should be still in the invention Protection domain among.The scope of the present invention is defined by the appended claims and its equivalents.

Claims (5)

  1. A kind of 1. switching capacity two-way DC converter single supply integrated driving, it is characterised in that including inverter main circuit and Drive circuit,
    N number of power tube S is included in inverter main circuitjWith N-1 DC capacitor Ck, 1≤j≤N, 1≤k≤N-1, wherein N number of work( The source electrode of rate pipe and drain electrode, which are sequentially connected, connects composition cascaded structure, and adjacent any power tube working status is complementary；Any capacitance CkUpper tube S in the power tube of two series connection is connected in parallel on respectivelyk+1Source electrode and down tube SkDrain electrode both ends, 1≤k≤N-1；
    Drive circuit includes N number of driving chip, a DC-DC isolated power supplies module, N number of electric capacity of voltage regulation CPiWith N-1 diode Di, 1≤i≤N；The gate pole output terminal v of wherein each driving chipgiRespectively through the resistance R that overdrivesgMeet power tube SiGate pole, drives The negative terminal v of dynamic chip gate drive voltagesiMeet power tube SiSource electrode, DC voltage-stabilizing capacitance CPiIt is positive and negative to connect driving chip outlet side Both ends vdiAnd vsiBetween；Diode DjMeet the two driving chip driving voltage anode v closed ondjAnd vd(j+1)Between.
  2. 2. switching capacity two-way DC converter single supply integrated driving according to claim 1, it is characterised in that two poles Pipe D2、D3…DNVoltage stress be respectively capacitance C1、C2…CN-1。
  3. 3. switching capacity two-way DC converter single supply integrated driving according to claim 1, it is characterised in that bootstrapping The gate capacitance value of capacitance meets：
    <mrow> <mi>C</mi> <mo>&amp;GreaterEqual;</mo> <mfrac> <msub> <mi>Q</mi> <mi>g</mi> </msub> <mrow> <msub> <mi>&amp;epsiv;</mi> <mrow> <mi>m</mi> <mi>a</mi> <mi>x</mi> </mrow> </msub> <mo>&amp;CenterDot;</mo> <msub> <mi>V</mi> <mrow> <mi>C</mi> <mi>p</mi> <mi>k</mi> </mrow> </msub> </mrow> </mfrac> </mrow>
    Wherein：QgFor power tube gate charge, VCpkTo drive capacitance voltage, εmaxFor maximum capacitor Voltage Drop set in advance Coefficient.
  4. A kind of 4. switching capacity two-way DC converter single supply integrated driving according to claims 1 to 3 any one Control method, it is characterised in that comprise the following steps：
    When converter works normally, the complementary conducting of two power tubes of arbitrary neighborhood, includes two kinds of operating modes：
    Pattern 1：PWM=1,At this time, odd number power tube S1、S3、S5…Sj, open-minded, j is odd number, even number power tube S2、 S4、S6…SkShut-off, k is even number；
    Pattern 2：PWM=1,At this time, power tube S1、S3、S5…SjShut-off, j is odd number；Power tube S2、S4、S6…Sk Open-minded, k is even number；
    As power tube S1When opening, DC voltage-stabilizing capacitance CP1Through resistance RgGive power tube S1Gate pole charges, and through diode D2And work( Rate pipe S1To for the second driving chip DC voltage-stabilizing capacitance CP2Power, at this time power tube S2Shut-off, diode D3Back-pressure is born to cut Only, power tube S3It is open-minded, DC voltage-stabilizing capacitance CP3Through resistance RgGive power tube S3Gate pole is powered, and through diode D4And power tube S3To for the 4th driving chip electric capacity of voltage regulation CP4Charging, and so on；As power tube S1During shut-off, diode D2Back-pressure is born to cut Only, power tube S2It is open-minded, DC voltage-stabilizing capacitance CP2Through resistance RgGive power tube S2Gate pole charges, and through diode D3And power tube S2To for the 3rd driving chip electric capacity of voltage regulation CP3Power supply, S3Shut-off, diode D2Back-pressure cut-off is born, and so on.
  5. 5. the control method of switching capacity two-way DC converter single supply integrated driving according to claim 4, it is special Sign is, comprises the following steps that：
    It is assumed that respectively bootstrapping capacitance voltage is zero in initial time drive circuit, when inputting PWM=1, all even number power tubes close Disconnected, the output of the first driving chip is provided with reference to high level by isolated power supply, power tube S1Smoothly conducting；Remaining odd number power tube by In voltage on corresponding bootstrap capacitor it is zero and can not opens；Power tube S1Conducting is so that this moment power tube S2Source potential With power tube S1Source potential it is equal, therefore diode D2Forward bias turns on, DC voltage-stabilizing capacitance CP1To DC voltage-stabilizing electricity Hold CP2Charge to DC voltage-stabilizing capacitance C rapidlyP2Both end voltage is isolated power supply output voltage, is subsequent time power tube S2Open It is logical to prepare；Afterwards, when inputting PWM=0, the shut-off of all odd number power tubes, due to during PWM=1, DC voltage-stabilizing capacitance CP2From DC voltage-stabilizing capacitance CP1Obtain energy storage and simultaneously keep certain voltage, thus the output of the second driving chip refer to it is suitable during high level Profit opens power tube S2, remaining even number power tube can not realize conducting due to no-voltage on corresponding bootstrap capacitor, similar, work( Rate pipe S2Conducting is so that this moment power tube S3Source potential and power tube S2It is equal, therefore diode D3Forward bias is led It is logical, DC voltage-stabilizing capacitance CP2To DC voltage-stabilizing capacitance CP3It is equal to charge to two capacitance voltages, is subsequent time power tube S3Carry For high level cut-in voltage；Repeat the above steps, when the circuit reaches steady state, approximate isolated power supply is obtained on each bootstrap capacitor The voltage of output；
    During stable state, the voltage of all bootstrap capacitors is approximately the voltage of isolated power supply module, in power stage circuit, all odd number work( The source potential of rate pipe immobilizes, and is corresponding capacitance voltage in main circuit；The source potential of all even number power tubes is to float , switch with the cycle of circuit operating pattern and change；As PWM=1, all odd number power tubes are both turned on, all even number work( Rate pipe SkSource potential be equal to its adjacent low level odd number power tube Sk-1Source potential, the bootstrap capacitor C of odd bitsP(k-1)To Adjacent high-order bootstrap capacitor CP(k)Charging；As PWM=0, all even number power tubes are both turned on, all even number power tube Sk's Source potential is equal to its adjacent high-order odd number power tube Sk+1Source potential, even bit bootstrap capacitor CP(k)To adjacent high-order Bootstrap capacitor CP(k+1)Charging.
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