CN108377094A - A kind of dead zone adjustment control method being suitable for double active bridge soft starts - Google Patents

A kind of dead zone adjustment control method being suitable for double active bridge soft starts Download PDF

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Publication number
CN108377094A
CN108377094A CN201810309566.0A CN201810309566A CN108377094A CN 108377094 A CN108377094 A CN 108377094A CN 201810309566 A CN201810309566 A CN 201810309566A CN 108377094 A CN108377094 A CN 108377094A
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China
Prior art keywords
control method
dab
active bridge
dead zone
double active
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CN201810309566.0A
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CN108377094B (en
Inventor
付永升
巩兆伟
雷鸣
胡文婷
李翰山
闫克丁
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Xian Technological University
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Xian Technological University
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Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time

Abstract

The invention belongs to current transformer control technology fields, and in particular to a kind of dead zone adjustment control method being suitable for double active bridge soft starts.It can realize the purpose of the limitation inrush current of wide scope.To achieve the object of the present invention, the step of the technical solution adopted in the present invention is：1) selecting switch frequency is started to work, and is selected to start dead time according to system inherent parameters；2) Voltage Feedback of acquisition bus capacitor is to DAB primary sides；3) according to formulaCalculate time dt；4) adjustment dead time is persistently charged to precharge and terminates.

Description

A kind of dead zone adjustment control method being suitable for double active bridge soft starts
Technical field：
The invention belongs to current transformer control technology fields, and in particular to a kind of dead zone tune being suitable for double active bridge soft starts Save control method.
Background technology：
Isolated two-way full-bridge DC/DC converters, also known as double bridge DAB that have chance with (Dual Active Bridge).Its due to Prime is isolated with rear class electric appliance, and system is made to obtain higher reliability.And between outputting and inputting based on its current transformer according to The two-way flow of energy can be realized by the leakage inductance of transformer, which is widely used in two-way AC/DC chargers.It is double AC/DC topological structures into AC/DC chargers can not only realize the function of charging Grid-to-Vehicle (G2V), and complete At grid-connected V2G (Vehicle-to-Grid) function.When the pwm signal phase of DAB originals end Mosfet secondary end in advance, realize simultaneously Net function.When the pwm signal delayed phase pair end of DAB originals end Mosfet, the function that power grid charges the battery is realized.
With automotive technology development, user wishes that automobile supplies household electrical appliance the demand of V2H (Vehicle-to-Home) It is increasing, new technological challenge is also proposed to system.When system works in V2H states, bus capacitor due to putting completely Its electric both end voltage is 0, the problem is that：System electrification after capacitance discharges completely becomes since capacitance both end voltage is 0 Depressor pair side is believed that in short-circuit condition, equivalent to arrive transformer primary side also to be short-circuit, therefore several periods before DAB work Its interior electric current can reach tens or hundreds of amperes, can directly burn out switching device or lead to systemic breakdown；It is usual for this problem There is certain defect to limitation inrush current using raising switching frequency and the method for phase shift：(1) using raising switch Frequency, after bus capacitor discharges completely, the equiva lent impedance of several work period input voltages is that (f is Z=2* π * f*L before DAB Switching frequency, L are transformer leakage inductance), thus electricity is impacted since the increase of impedance can reduce known to formula when switching frequency increases Stream.But at the same time since the driving chip power consumption that the increase of switching frequency f brings switching tube increases, gate leve drives resistance power consumption Increase, too high switching frequency can cause gate leve resistance or driving chip to damage and make systemic breakdown.(2) phase-shifting control method is Based on the DAB control methods that two-phase is moved, control strategy is complex, is sampled compared to its voltage and current of single Method of Phase-Shift Controlling Point multisystem stability and easily-controllable property are all relatively low.
Invention content：
The present invention propose a kind of dead zone adjustment control method being suitable for double active bridge soft starts, it can be achieved that wide scope limit The purpose of inrush current processed.
To achieve the object of the present invention, the technical solution adopted in the present invention is：One kind being suitable for double active bridge soft starts Dead zone adjustment control method, include the following steps：
One, selecting switch frequency is started to work, and is selected to start dead time according to system inherent parameters；
Two, the Voltage Feedback of acquisition bus capacitor is to DAB primary sides；
Three, according to formulaCalculate time dt；
Four, adjustment dead time is persistently charged to precharge and terminates.
Compared with prior art, it is an advantage of the invention that：
1, currently used increase switching frequency method, switching frequency will be reduced to normal work at the end of precharge Working frequency, unexpected frequency hopping meeting pulse-losing reduce the reliability of system.System inrush current control range and DC side Input voltage, the leakage inductance of transformer and system switching frequency itself are related, and multiple phase-shift control method complexity is not easy to realize.And it utilizes The present invention method simply and quantitatively can provide data, it can be achieved that wide scope limitation inrush current.
2, because of the method compared to raising frequency, present invention reduces the damages of switching tube, driver, gate leve resistance in system Probability, and control method is simple to operation, therefore improve the reliability of system.
3, due to the use of inventive method reduces the times for being added in voltage effect in DAB primary sides, so dynamic started Dash current is greatly lowered in journey, while when switch frequency determines, DAB maximum duty cycles are 50%, you can are immediately arrived at defeated Enter the effective time that voltage is added in DAB primary sides, action time T=1/f*0.5-Tdb(TdbFor dead time), adjustable range Greatly, thus adjust dead time can wide scope adjustment dash current.
Description of the drawings：
Fig. 1 is two-way AC/DC charging systems topological structure；
Fig. 2 is DAB fundamental diagrams；
It is that 11.5uH in busbar voltage and bus capacitor is respectively 550V and 110uF that Fig. 3, which is 10kW systems, transformer leakage inductance, When, the dash current in start-up course and DC bus-bar voltage waveform；(dead zones 100kHz＆200ns)；
The PWM drive signal of DAB switching tubes when Fig. 4 is single-phase shifting；
Fig. 5 is using dash current of the system in start-up course after the present invention and DC bus-bar voltage waveform；
Fig. 6 is DAB primary currents (dead zones 100kHz＆4us) when present system starts.
Specific implementation mode：
The present invention will be described in detail by specific embodiments and the drawings below.
Referring to Fig. 1 and Fig. 2, switching tube S1To S8DC/DC converters are constituted, when systematic steady state is 50% duty ratio, is passed through Regulating switch phase shift and transformer leakage inductance L complete the transmitted in both directions of energy.Its on off state and operation principle are as shown in Figure 2.It opens Close pipe Sa1To Sc2Constitute DC/AC inverters, it can be achieved that energy two-way flow.
Capacitance C1It is the input capacitance of automobile batteries parallel connection, capacitance C2It is dc-link capacitance.When the system operation is in V2H When state, due to bus capacitor C2Cannot achieve precharge, thus in the system starting process sides DC-DC due to bus capacitor Voltage be zero, the equiva lent impedance at transformer primary end is also zero.Therefore in battery side first time impact voltage to system, The sides DAB Mosfets can be by larger dash current.Assuming that the electric current for flowing through transformer in system starting process is IpA, then IpIt can be obtained by the following formula.
Because
So at this time in the equiva lent impedance of primary side：
Req=2* π * f*L (1)
Therefore the electric current of primary side transformer is flowed through：
Herein for designing the V2H systems of a 10kW, the three-phase alternating current of automobile battery voltage 400, output is 50Hz, phase voltage virtual value is 220V, therefore busbar voltage must at least boost to 600v.And the turn ratio of Design of Transformer is 1: 1.5, input capacitance and dc-link capacitance are 110uF, the sides DAB switching frequency be 100kHz system starting process emulate referring to Fig. 3.
From the figure 3, it may be seen that in the system dynamic start-up course maximum by the electric current for having 110A flow through transformer with Mosfets, therefore in the process, the method for generally use raising switching frequency and phase shift has limitation inrush current Certain defect.
A kind of dead zone adjustment control method being suitable for double active bridge soft starts that the present invention provides, includes the following steps：
One, selecting switch frequency is started to work, and is selected to start dead time according to system inherent parameters；
Two, the Voltage Feedback of acquisition bus capacitor is to DAB primary sides；
Three, according to formulaCalculate time dt；
Four, adjustment dead time is persistently charged to precharge and terminates.
The method of the present invention is to use the voltage time for reducing and being added in leakage inductance to realize the process of system soft start, theoretical It is analyzed as follows:Its sides DAB Mosfet switching signal is as shown in Figure 4：Primary and secondary side phase shift is 0 while all Mosfet of inverter side It remains turned-off.
Similarly：BecauseTherefore automobile batteries is in the moment of access system, and only transformer leakage inductance is as battery It loads and then limits the dash current for flowing through the sides DAB.
V in formula (3)LFor the voltage on transformer leakage inductance, D is the sides DC/DC pwm signal duty ratio in formula (4), U in formula (6)0 For bus capacitor C2On initial voltage.Voltage on bus capacitor can be obtained by formula (3)~formula (6)For：
From formula (7)：Due to the voltage V at transformer leakage inductance both endsL, leakage inductance L, switching frequency f and duty ratio be definite value, Therefore as PWM dead times increase, the electric current flowed through can also reduce.The DC/DC originals end when system first switches on power supply It is opened with secondary end Mosfet and its duty ratio is as the increase of time is from minimum value (Dmin) increase to systematic steady state normal value (Dnom).Its duration T can be determined by formula (8).
Dnom=Dmin+Drste*T (8)
DrsteFor the Magnification of primary side pwm signal duty ratio, time T is that duty ratio is increased to from minimum required for desired value Time.
Based on this conclusion, it is assumed that the sides DAB switching frequency is 100kHz, is respectively 4us with PWM dead times, emulates 10kW Dash current of the system in start-up course and DC bus-bar voltage waveform are as shown in Figure 5.Referring to Fig. 6, it is operated in the system 100kHZ, when dead time is 4us, dash current is greatly lowered in dynamic start-up course, and different dead according to adjusting Area's time can wide scope adjustment dash current, therefore effectively increase using this method the reliability of system.

Claims (1)

1. a kind of dead zone adjustment control method being suitable for double active bridge soft starts, it is characterised in that：The control method includes Following steps：
1) selecting switch frequency is started to work, and is selected to start dead time according to system inherent parameters；
2) Voltage Feedback of acquisition bus capacitor is to DAB primary sides；
3) according to formulaCalculate time dt；
4) adjustment dead time is persistently charged to precharge and terminates.
CN201810309566.0A 2018-04-09 2018-04-09 Dead zone regulation control method suitable for soft start of double active bridges Expired - Fee Related CN108377094B (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110011528A (en) * 2019-04-18 2019-07-12 珠海格力电器股份有限公司 Bridge circuit soft-start method, controller and equipment
CN110481361A (en) * 2019-08-08 2019-11-22 西安工业大学 The vehicle-mounted two-way charger centerline construction of electric car and its control method
CN111030464A (en) * 2019-12-20 2020-04-17 深圳市高斯宝电气技术有限公司 Control method of bidirectional LLC circuit of power converter
DE102018220757A1 (en) * 2018-11-30 2020-06-04 Schmidhauser Ag Galvanically isolating DC / DC converter
CN111769742A (en) * 2020-05-06 2020-10-13 国网江苏省电力有限公司电力科学研究院 Method, device and system for calculating control dead zone of resonant bidirectional active bridge
CN113037094A (en) * 2021-03-16 2021-06-25 中车青岛四方车辆研究所有限公司 Inverter control method and system
CN113258790A (en) * 2021-07-15 2021-08-13 深圳市永联科技股份有限公司 Converter control method and related device
US11121634B2 (en) * 2018-12-07 2021-09-14 Sharp Kabushiki Kaisha Bidirectional DC-to-DC converter with inrush current suppression
US11646663B1 (en) 2022-02-25 2023-05-09 Hong Kong Applied Science and Technology Research Institute Company Limited Adaptive dead-time control of a synchronous buck converter
CN117293976A (en) * 2023-11-24 2023-12-26 爱士惟新能源技术(扬中)有限公司 Battery awakening method of energy storage converter
CN117639517A (en) * 2024-01-25 2024-03-01 广东工业大学 Fault isolation type medium-voltage direct-current transformer and control strategy thereof
WO2024045365A1 (en) * 2022-08-31 2024-03-07 广东美的制冷设备有限公司 Control method for resonant circuit, and control apparatus and readable storage medium

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018220757A1 (en) * 2018-11-30 2020-06-04 Schmidhauser Ag Galvanically isolating DC / DC converter
US11121634B2 (en) * 2018-12-07 2021-09-14 Sharp Kabushiki Kaisha Bidirectional DC-to-DC converter with inrush current suppression
CN110011528A (en) * 2019-04-18 2019-07-12 珠海格力电器股份有限公司 Bridge circuit soft-start method, controller and equipment
CN110481361A (en) * 2019-08-08 2019-11-22 西安工业大学 The vehicle-mounted two-way charger centerline construction of electric car and its control method
CN111030464A (en) * 2019-12-20 2020-04-17 深圳市高斯宝电气技术有限公司 Control method of bidirectional LLC circuit of power converter
CN111030464B (en) * 2019-12-20 2023-01-24 深圳市能效电气技术有限公司 Control method of bidirectional LLC circuit of power converter
CN111769742A (en) * 2020-05-06 2020-10-13 国网江苏省电力有限公司电力科学研究院 Method, device and system for calculating control dead zone of resonant bidirectional active bridge
CN113037094B (en) * 2021-03-16 2022-03-25 中车青岛四方车辆研究所有限公司 Inverter control method and system
CN113037094A (en) * 2021-03-16 2021-06-25 中车青岛四方车辆研究所有限公司 Inverter control method and system
CN113258790B (en) * 2021-07-15 2021-09-14 深圳市永联科技股份有限公司 Converter control method and related device
CN113258790A (en) * 2021-07-15 2021-08-13 深圳市永联科技股份有限公司 Converter control method and related device
US11646663B1 (en) 2022-02-25 2023-05-09 Hong Kong Applied Science and Technology Research Institute Company Limited Adaptive dead-time control of a synchronous buck converter
WO2023159657A1 (en) * 2022-02-25 2023-08-31 Hong Kong Applied Science and Technology Research Institute Company Limited Adaptive dead-time control of a synchronous buck converter
WO2024045365A1 (en) * 2022-08-31 2024-03-07 广东美的制冷设备有限公司 Control method for resonant circuit, and control apparatus and readable storage medium
CN117293976A (en) * 2023-11-24 2023-12-26 爱士惟新能源技术(扬中)有限公司 Battery awakening method of energy storage converter
CN117293976B (en) * 2023-11-24 2024-03-01 爱士惟新能源技术(扬中)有限公司 Battery awakening method of energy storage converter
CN117639517A (en) * 2024-01-25 2024-03-01 广东工业大学 Fault isolation type medium-voltage direct-current transformer and control strategy thereof
CN117639517B (en) * 2024-01-25 2024-04-26 广东工业大学 Fault isolation type medium-voltage direct-current transformer and control strategy thereof

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