WO2020093508A1 - Bidirectional isolated dc/dc circuit and control method therefor - Google Patents

Bidirectional isolated dc/dc circuit and control method therefor Download PDF

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WO2020093508A1
WO2020093508A1 PCT/CN2018/120173 CN2018120173W WO2020093508A1 WO 2020093508 A1 WO2020093508 A1 WO 2020093508A1 CN 2018120173 W CN2018120173 W CN 2018120173W WO 2020093508 A1 WO2020093508 A1 WO 2020093508A1
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voltage
low
switch
switch tube
drive signal
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PCT/CN2018/120173
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French (fr)
Chinese (zh)
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万建
刘滔
黄敏
方刚
卢进军
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江苏固德威电源科技股份有限公司
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion 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
    • H02M3/325Conversion 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
    • H02M3/335Conversion 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
    • H02M3/33569Conversion 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
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0048Circuits or arrangements for reducing losses
    • H02M1/0054Transistor switching losses
    • H02M1/0058Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

Disclosed is a bidirectional isolated DC/DC circuit, comprising a low voltage side full-bridge structure, a high voltage side full-bridge structure, a transformer (Tx), a resonant inductor (Lr) and a resonant capacitor (Cr), wherein the low voltage side full-bridge structure comprises four low voltage side switch tubes (Q1-Q4), a first low voltage side switch tube (Q1) and a third low voltage side switch tube (Q3) are connected in series to form a low voltage side first bridge arm, and a second low voltage side switch tube (Q2) and a fourth low voltage side switch tube (Q4) are connected in series to form a low voltage side second bridge arm; the high voltage side full-bridge structure comprises four high voltage side switch tubes (Q5-Q8), a first high voltage side switch tube (Q5) and a third high voltage side switch tube (Q7) are connected in series to form a high voltage side first bridge arm, and a second high voltage side switch tube (Q6) and a fourth high voltage side switch tube (Q8) are connected in series to form a high voltage side second bridge arm; and the middle point of the low voltage side first bridge arm and the middle point of the low voltage side second bridge arm are connected to the low voltage side of the transformer (Tx), and the high voltage side of the transformer (Tx) is connected to the middle point of the high voltage side first bridge arm and the middle point of the high voltage side second bridge arm via the resonant capacitor (Cr). The volume and weight of the product can be reduced by using this bidirectional isolated DC/DC circuit, the cost of the system is reduced, and the efficiency and reliability of the system are improved.

Description

双向隔离DC/DC电路及其采用的控制方法Bidirectional isolated DC / DC circuit and its control method 技术领域Technical field
本发明属于电力变换技术领域,涉及一种双向隔离DC/DC电路及其采用的控制方法,主要应用于电池储能行业,实现电池的充放电。The invention belongs to the technical field of power conversion, and relates to a bidirectional isolated DC / DC circuit and a control method adopted therein, which are mainly used in the battery energy storage industry to realize battery charging and discharging.
背景技术Background technique
现在主流的低压分布式光伏发电储能系统架构,采用直流母线耦合技术。即光伏面板串联成高压,经过Boost电路升压电路连接到直流母线;低压电池通过双向的升降压DC/DC电路连接到直流母线,然后直流母线经过DC/AC电路连接到交流输出。考虑到低压电池的安全性,一般电池是通过隔离的双向DC/DC电路到直流母线。The current mainstream low-voltage distributed photovoltaic power storage system architecture uses DC bus coupling technology. That is, the photovoltaic panels are connected in series into high voltage and connected to the DC bus through the boost circuit boost circuit; the low-voltage battery is connected to the DC bus through a bidirectional buck-boost DC / DC circuit, and then the DC bus is connected to the AC output through the DC / AC circuit. Considering the safety of the low-voltage battery, the general battery is through the isolated bidirectional DC / DC circuit to the DC bus.
目前主流的高效率的隔离DC/DC电路选择LLC电路,但LLC电路的变频控制有其无法宽范围调节增益的缺点。而光伏组串的电压变化大导致了直流母线的电压也变化较大,所以传统的LLC电路不适合光伏储能上应用。因此,目前光伏储能上主流的应用电路是LLC+Buck/boost的方案,LLC用于实现高频隔离,Buck/boost用于实现宽增益的调节。但整个系统中,由于增加了元器件,增加了产品的体积和重量,也相应增加了产品的成本。The current mainstream high-efficiency isolated DC / DC circuit selects the LLC circuit, but the frequency conversion control of the LLC circuit has the disadvantage that it cannot adjust the gain in a wide range. The large change in the voltage of the photovoltaic string leads to a large change in the voltage of the DC bus, so the traditional LLC circuit is not suitable for photovoltaic energy storage applications. Therefore, the current mainstream application circuit for photovoltaic energy storage is the LLC + Buck / boost solution. LLC is used to achieve high frequency isolation, and Buck / boost is used to achieve wide gain adjustment. But in the whole system, due to the increase of components, the volume and weight of the product are increased, and the cost of the product is also increased accordingly.
发明内容Summary of the invention
本发明的目的是提供一种减小产品体积和重量,降低系统的成本,提高系统的效率及可靠性的双向隔离DC/DC电路及其控制方法。The purpose of the present invention is to provide a bidirectional isolated DC / DC circuit and its control method that reduce product volume and weight, reduce system cost, and improve system efficiency and reliability.
为达到上述目的,本发明采用的技术方案是:To achieve the above objectives, the technical solutions adopted by the present invention are:
一种双向隔离DC/DC电路,包括低压侧全桥架构、高压侧全桥架构、变压器、谐振电感和谐振电容;A bidirectional isolated DC / DC circuit, including a low-voltage side full-bridge architecture, a high-voltage side full-bridge architecture, a transformer, a resonant inductor and a resonant capacitor;
所述低压侧全桥架构包括四颗低压侧开关管,分别为低压侧开关管Q1、低压侧开关管Q2、低压侧开关管Q3和低压侧开关管Q4,所述低压侧开关管Q1和所述低压侧开关管Q3串联构成低压侧第一桥臂,所述低压侧开关管Q2和所述低压侧开关管Q4串联构成低压侧第二桥臂;所述低压侧第一桥臂和所述低压侧第二桥臂并联的两端构成所述双向隔离DC/DC电路的低压侧输入输出端;The low-voltage side full-bridge architecture includes four low-voltage side switch tubes, which are a low-voltage side switch tube Q1, a low-voltage side switch tube Q2, a low-voltage side switch tube Q3, and a low-voltage side switch tube Q4, and the low-voltage side switch tube Q1 and all The low-voltage side switch tube Q3 is connected in series to form a low-voltage side first bridge arm, the low-voltage side switch tube Q2 and the low-voltage side switch tube Q4 are connected in series to form a low-voltage side second bridge arm; the low-voltage side first bridge arm and the The two ends of the low voltage side second bridge arm connected in parallel constitute the low voltage side input and output terminals of the bidirectional isolated DC / DC circuit;
所述高压侧全桥架构包括四颗高压侧开关管,分别为高压侧开关管Q5、高压侧开关管Q6、高压侧开关管Q7和高压侧开关管Q8,所述高压侧开关管Q5和所述高压侧开关管Q7串联构成高压侧第一桥臂,所述高压侧开关管Q6和所述高压侧开关管Q8串联构成高压侧第二桥臂;所述高压侧第一桥臂和所述高压侧第二桥臂并联的两端构成所述双向隔离DC/DC电路的高压侧输入输出端;The high-voltage side full-bridge architecture includes four high-voltage side switch tubes, which are a high-voltage side switch tube Q5, a high-voltage side switch tube Q6, a high-voltage side switch tube Q7, and a high-voltage side switch tube Q8, and the high-voltage side switch tube Q5 and all The high voltage side switch tube Q7 is connected in series to form a high voltage side first bridge arm, the high voltage side switch tube Q6 and the high voltage side switch tube Q8 are connected in series to form a high voltage side second bridge arm; the high voltage side first bridge arm and the The two ends of the second bridge arm on the high voltage side connected in parallel constitute the high voltage side input and output terminals of the bidirectional isolated DC / DC circuit;
所述低压侧第一桥臂的中点和所述低压侧第二桥臂的中点连接至所述变压器的低压侧,所述变压器的高压侧经所述谐振电容后连接至所述高压侧第一桥臂的中点和所述高压侧第二桥臂的中点。The midpoint of the first bridge arm on the low voltage side and the midpoint of the second bridge arm on the low voltage side are connected to the low voltage side of the transformer, and the high voltage side of the transformer is connected to the high voltage side after the resonance capacitor The midpoint of the first bridge arm and the midpoint of the second bridge arm on the high voltage side.
优选的,所述低压侧开关管采用MOSFET管。Preferably, the low-voltage side switch tube uses a MOSFET tube.
优选的,所述高压侧开关管采用MOS管。Preferably, the high-voltage side switch tube is a MOS tube.
优选的,所述谐振电感集成于所述变压器中。Preferably, the resonant inductor is integrated in the transformer.
优选的,所述变压器中还集成有励磁电感。Preferably, the excitation inductance is also integrated in the transformer.
上述双向隔离DC/DC电路采用的控制方法为:The control method adopted by the above bidirectional isolated DC / DC circuit is:
当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述低压侧开关管的驱动信号占空比为50%,所述低压侧开关管Q1和所述低压侧开关管Q4采用相同的驱动信号,所述低压侧开关管Q2和所述低压侧开关管Q3采用相同的驱动信号,且所述低压侧开关管Q1和所述低压侧开关管Q4的驱动信号与所述低压侧开关管Q2和所述低压侧开关管Q3的驱动信号互补;所述高压侧开关管Q7和高压侧开关管Q8具有相同的导通时间,且相位交错180°,所述高压侧开关管Q5的驱动信号与所述高压侧开关管Q7的驱动信号互补,所述高压侧开关管Q6的驱动信号与所述高压侧开关管Q8的驱动信号互补,所述高压侧开关管Q7的驱动信号相位与所述低压侧开关管Q2和所述低压侧开关管Q3的驱动信号相位相同,所述高压侧开关管Q8的驱动信号相位与所述低压侧开关管Q1和所述低压侧开关管Q4的驱动信号相位相同;When electric energy flows from the low-voltage side input-output terminal to the high-voltage side input-output terminal, the duty ratio of the driving signal of the low-voltage side switch tube is 50%, and the low-voltage side switch tube Q1 and the low-voltage side switch tube Q4 uses the same drive signal, the low-voltage switch Q2 and the low-voltage switch Q3 use the same drive signal, and the drive signals of the low-voltage switch Q1 and the low-voltage switch Q4 are the same as the The drive signals of the low-side switch Q2 and the low-side switch Q3 are complementary; the high-side switch Q7 and the high-side switch Q8 have the same on-time, and the phases are staggered by 180 °, and the high-side switch The drive signal of Q5 is complementary to the drive signal of the high-side switch Q7, the drive signal of the high-voltage switch Q6 is complementary to the drive signal of the high-voltage switch Q8, and the drive signal of the high-side switch Q7 The phase is the same as the drive signal phase of the low-voltage side switch tube Q2 and the low-voltage side switch tube Q3, and the drive signal phase of the high-voltage side switch tube Q8 is the same as the low-voltage side switch tube Q1 and the low-voltage side switch tube Q4 The same drive signal phase;
当电能由所述高压侧输入输出端流向所述低压侧输入输出端时,所述高压侧开关管Q5的驱动信号和所述高压侧开关管Q6的驱动信号为PWM互补信号,所述高压侧开关管Q5的驱动信号与所述高压侧开关管Q8的驱动信号为同步的PWM信号,所述高压侧开关管Q6的驱动信号与所述高压侧开关管Q7的驱动信号为同步的PWM信号,所述低压侧开关管Q1的驱动信号和所述低压侧开关管Q4的驱动信号相同,所述低压侧开关管Q2的驱动信号和所述低压侧开关管Q3的驱动信号相同,且所述低压侧开关管Q1的驱动信号和所述低压侧开关管Q4的驱动信号与所述高压侧开关管Q5的驱动信号同步,所述低压侧开关管Q2的驱动信号和所述低压侧开关管Q3的驱动信号与所述高压侧开关管Q6的驱动信号同步。When electric energy flows from the high-voltage side input-output end to the low-voltage side input-output end, the drive signal of the high-voltage side switch tube Q5 and the drive signal of the high-voltage side switch tube Q6 are PWM complementary signals, and the high-voltage side The drive signal of the switch Q5 and the drive signal of the high-voltage switch Q8 are synchronized PWM signals, the drive signal of the high-voltage switch Q6 and the drive signal of the high-voltage switch Q7 are synchronized PWM signals, The drive signal of the low-side switch Q1 is the same as the drive signal of the low-side switch Q4, the drive signal of the low-voltage switch Q2 is the same as the drive signal of the low-side switch Q3, and the low voltage The drive signal of the side switch tube Q1 and the drive signal of the low-voltage switch tube Q4 are synchronized with the drive signal of the high-voltage switch tube Q5, the drive signal of the low-voltage switch tube Q2 and the low-voltage switch tube Q3 The driving signal is synchronized with the driving signal of the high-voltage side switch tube Q6.
优选的,当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述高压侧开关管Q7和高压侧开关管Q8的导通时间
Figure PCTCN2018120173-appb-000001
其中,Lr为谐振电感,Cr为谐振电容。
Preferably, when electric energy flows from the low-voltage side input-output terminal to the high-voltage side input-output terminal, the conduction time of the high-voltage side switch tube Q7 and the high-voltage side switch tube Q8
Figure PCTCN2018120173-appb-000001
Among them, Lr is the resonance inductance, Cr is the resonance capacitance.
优选的,当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述低压侧开关管和所述高压侧开关管的开关频率可调。Preferably, when electric energy flows from the low-voltage side input-output end to the high-voltage side input-output end, the switching frequency of the low-voltage side switch tube and the high-voltage side switch tube is adjustable.
优选的,当电能由所述高压侧输入输出端流向所述低压侧输入输出端时,所述低压侧开关管和所述高压侧开关管的开关周期
Figure PCTCN2018120173-appb-000002
其中,Lr为谐振电感,Cr为谐振电容。
Preferably, when electric energy flows from the high-voltage side input-output end to the low-voltage side input-output end, the switching periods of the low-voltage side switch tube and the high-voltage side switch tube
Figure PCTCN2018120173-appb-000002
Among them, Lr is the resonance inductance, Cr is the resonance capacitance.
优选的,所述高压侧开关管Q7的驱动信号的占空比和高压侧开关管Q8的驱动信号的占空比相同,且最大限值为50%。Preferably, the duty ratio of the driving signal of the high-side switch Q7 is the same as the duty ratio of the driving signal of the high-side switch Q8, and the maximum limit is 50%.
由于上述技术方案运用,本发明与现有技术相比具有下列优点:本发明能够减小产品体积和重量,降低系统的成本,提高系统的效率及可靠性。Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art: the present invention can reduce the product volume and weight, reduce the cost of the system, and improve the efficiency and reliability of the system.
附图说明BRIEF DESCRIPTION
附图1为本发明的双向隔离DC/DC电路的电路图。FIG. 1 is a circuit diagram of a bidirectional isolated DC / DC circuit of the present invention.
附图2为本发明的双向隔离DC/DC电路在电池放电时的信号时序图。FIG. 2 is a signal timing diagram of the bidirectional isolated DC / DC circuit of the present invention when the battery is discharged.
附图3为本发明的双向隔离DC/DC电路在电池充电时的信号时序图。FIG. 3 is a signal timing diagram of the bidirectional isolated DC / DC circuit of the present invention when the battery is charging.
具体实施方式detailed description
下面结合附图所示的实施例对本发明作进一步描述。The present invention will be further described below with reference to the embodiments shown in the drawings.
实施例一:如附图1所示,一种双向隔离DC/DC电路,包括低压侧全桥架构、高压侧全桥架构、变压器Tx、谐振电感Lr和谐振电容Cr。Embodiment 1: As shown in FIG. 1, a bidirectional isolated DC / DC circuit includes a low-voltage side full-bridge architecture, a high-voltage side full-bridge architecture, a transformer Tx, a resonant inductor Lr, and a resonant capacitor Cr.
低压侧全桥架构包括四颗低压侧开关管,分别为低压侧开关管Q1、低压侧开关管Q2、低压侧开关管Q3和低压侧开关管Q4。各低压侧开关管均采用MOSFET管。低压侧开关管Q1和低压侧开关管Q3串联构成低压侧第一桥臂,低压侧开关管Q2和低压侧开关管Q4串联构成低压侧第二桥臂。低压侧第一桥臂和低压侧第二桥臂并联的两端构成双向隔离DC/DC电路的低压侧输入输出端,在分布式光伏发电储能系统架构中,该低压侧输入输出端用于连接电池。The low-side full-bridge architecture includes four low-side switch tubes, namely a low-side switch tube Q1, a low-side switch tube Q2, a low-side switch tube Q3, and a low-side switch tube Q4. Each low side switch tube adopts MOSFET tube. The low-voltage side switch tube Q1 and the low-voltage side switch tube Q3 are connected in series to form a low-voltage side first bridge arm, and the low-voltage side switch tube Q2 and the low-voltage side switch tube Q4 are connected in series to form a low-voltage side second bridge arm. The two ends of the low-voltage side first bridge arm and the low-voltage side second bridge arm in parallel form a low-voltage side input and output terminal of a bidirectional isolated DC / DC circuit. In a distributed photovoltaic energy storage system architecture, the low-voltage side input and output terminal is used to Connect the battery.
高压侧全桥架构包括四颗高压侧开关管,分别为高压侧开关管Q5、高压侧开关管Q6、高压侧开关管Q7和高压侧开关管Q8。各高压侧开关管均采用MOS管。高压侧开关管Q5和高压侧开关管Q7串联构成高压侧第一桥臂,高压侧开关管Q6和高压侧开关管Q8串联构成高压侧第二桥臂。高压侧第一桥臂和高压侧第二桥臂并联的两端构成双向隔离DC/DC电路的高压侧输入输出端,在分布式光伏发电储能系统架构中,该低压侧输入输出端用于连接直流母线。The high-voltage side full-bridge architecture includes four high-voltage side switch tubes, which are a high-voltage side switch tube Q5, a high-voltage side switch tube Q6, a high-voltage side switch tube Q7, and a high-voltage side switch tube Q8. Each high-voltage side switch tube adopts MOS tube. The high-voltage side switch tube Q5 and the high-voltage side switch tube Q7 are connected in series to form a high-voltage side first bridge arm, and the high-voltage side switch tube Q6 and the high-voltage side switch tube Q8 are connected in series to form a high-voltage side second bridge arm. The two ends of the high-voltage side first bridge arm and the high-voltage side second bridge arm in parallel form a high-voltage side input and output terminal of a bidirectional isolated DC / DC circuit. In a distributed photovoltaic energy storage system architecture, the low-voltage side input and output terminal is used to Connect the DC bus.
低压侧第一桥臂的中点和低压侧第二桥臂的中点连接至变压器Tx的低压侧,变压器Tx的高压侧经谐振电容Cr后连接至高压侧第一桥臂的中点和高压侧第二桥臂的中点。The midpoint of the first bridge arm on the low-voltage side and the midpoint of the second bridge arm on the low-voltage side are connected to the low-voltage side of the transformer Tx. The high-voltage side of the transformer Tx is connected to the midpoint of the first bridge arm on the high-voltage side and the high-voltage through the resonance capacitor Cr The midpoint of the second bridge arm on the side.
以上方案中,谐振电感Lr集成于变压器Tx中,变压器Tx中还集成有励磁电感。In the above solution, the resonance inductance Lr is integrated in the transformer Tx, and the excitation inductance is also integrated in the transformer Tx.
上述双向隔离DC/DC电路采用的控制方法为:The control method adopted by the above bidirectional isolated DC / DC circuit is:
当电能由低压侧输入输出端流向高压侧输入输出端,即电池放电时,低压侧开关管的驱动信号占空比为50%,低压侧开关管Q1和低压侧开关管Q4采用相同的驱动信号,低压侧开关管Q2和低压侧开关管Q3采用相同的驱动信号,且低压侧开关管Q1和低压侧开关管Q4的驱动信号与低压侧开关管Q2和低压侧开关管Q3的驱动信号互补,之间留有一定的死区时间;高压侧开关管Q7和高压侧开关管Q8具有相同的导通时间,且相位交错180°,高压侧开关管Q7和高压侧开关管Q8的导通时间由谐振电感Lr和谐振电容Cr的谐振频率决定,导通时间
Figure PCTCN2018120173-appb-000003
高压侧开关管Q5的驱动信号与高压侧开关管Q7的驱动信号互补,高压侧开关管Q6的驱动信号与高压侧开关管Q8的驱动信号互补,分别留有一定的死区时间,高压侧开关管Q7的驱动信号相位与低压侧开关管Q2和低压侧开关管Q3的驱动信号相位相同,高压侧开关管Q8的驱动信号相位与低压侧开关管Q1和低压侧开关管Q4的驱动信号相位相同。
When the electric energy flows from the low-voltage input and output to the high-voltage input and output, that is, when the battery is discharged, the duty cycle of the low-voltage switch tube is 50%, and the low-voltage switch tube Q1 and the low-voltage switch tube Q4 use the same drive signal , The low-side switch Q2 and the low-side switch Q3 use the same drive signal, and the drive signals of the low-side switch Q1 and the low-side switch Q4 are complementary to the drive signals of the low-side switch Q2 and the low-side switch Q3, There is a certain dead time between them; the high-side switch Q7 and the high-side switch Q8 have the same on-time, and the phases are staggered by 180 °. The on-time of the high-side switch Q7 and the high-side switch Q8 is determined by The resonant frequency of the resonant inductor Lr and the resonant capacitor Cr determines the on-time
Figure PCTCN2018120173-appb-000003
The drive signal of the high-side switch Q5 is complementary to the drive signal of the high-side switch Q7, the drive signal of the high-side switch Q6 is complementary to the drive signal of the high-side switch Q8, leaving a certain dead time, high-side switch The phase of the driving signal of the tube Q7 is the same as the phase of the driving signal of the low-side switching tube Q2 and the low-side switching tube Q3, and the phase of the driving signal of the high-side switching tube Q8 is the same as the phase of the driving signal of the low-side switching tube Q1 and the low-side switching tube Q4 .
低压侧开关管和高压侧开关管的开关频率可调。通过调节Q1~Q8的开关频率来实现增益的调节,由于Q7、Q8的导通时间固定,频率提高相当于占空比增加,频率减小相当于占空比减小。当高压侧电压高时,增加频率,占空比变大,提高增益;当高压侧电压低时,降低频率,占空比减小,减小增益。Q1~Q8的驱动时序如图2。The switching frequency of the low-voltage side switch tube and the high-voltage side switch tube is adjustable. The gain is adjusted by adjusting the switching frequency of Q1 to Q8. Since the conduction time of Q7 and Q8 is fixed, the increase in frequency is equivalent to an increase in duty cycle, and the decrease in frequency is equivalent to a decrease in duty cycle. When the voltage on the high voltage side is high, increase the frequency, the duty cycle becomes larger, and increase the gain; when the voltage on the high voltage side is low, reduce the frequency, the duty cycle decreases, and reduce the gain. The driving sequence of Q1 ~ Q8 is shown in Figure 2.
当电能由高压侧输入输出端流向低压侧输入输出端,即电池充电时,低压侧开关管和高压侧开关管的开关周期
Figure PCTCN2018120173-appb-000004
高压侧开关管Q5的驱动信号和高压侧开关管Q6的驱动信号为PWM互补信号,高压侧开关管Q5的驱动信号与高压侧开关管Q8的驱动信号为同步的PWM信号,高压侧开关管Q6的驱动信号与高压侧开关管Q7的驱动信号为同步的PWM信号。高压侧开关管Q7的驱动信号的占空比和高压侧开关管Q8的驱动信号的占空比相同且大小可调,最大限值为50%。在功率较大时,Q1~Q4做同步整流,低压侧开关管Q1的驱动信号和低压侧开关管Q4的驱动信号相同,低压侧开关管Q2的驱动信号和低压侧开关管Q3的驱动信号相同,且低压侧开关管Q1的驱动信号和低压侧开关管Q4 的驱动信号与高压侧开关管Q5的驱动信号同步,低压侧开关管Q2的驱动信号和低压侧开关管Q3的驱动信号与高压侧开关管Q6的驱动信号同步。通过调节Q7、Q8的占空比大小来调节输出增益,当电池电压高或直流母线电压低时,Q7、Q8的占空比增加,提高增益;当电池电压低或直流母线电压高时,Q7、Q8的占空比减小,减小增益。Q1~Q8的驱动时序如图3。
When electric energy flows from the high-voltage side input and output to the low-voltage side input and output, that is, when the battery is charged, the switching period of the low-voltage side switch tube and the high-voltage side switch tube
Figure PCTCN2018120173-appb-000004
The drive signal of the high side switch Q5 and the drive signal of the high side switch Q6 are PWM complementary signals, the drive signal of the high side switch Q5 and the drive signal of the high side switch Q8 are synchronous PWM signals, the high side switch Q6 The drive signal and the drive signal of the high-side switch Q7 are synchronous PWM signals. The duty ratio of the driving signal of the high-side switch Q7 is the same as the duty ratio of the driving signal of the high-side switch Q8 and the size is adjustable, and the maximum limit is 50%. When the power is large, Q1 ~ Q4 are synchronously rectified. The drive signal of the low-side switch Q1 is the same as the drive signal of the low-side switch Q4, the drive signal of the low-side switch Q2 is the same as the drive signal of the low-side switch Q3 , And the drive signal of the low-side switch Q1 and the drive signal of the low-side switch Q4 are synchronized with the drive signal of the high-side switch Q5, the drive signal of the low-side switch Q2 and the drive signal of the low-side switch Q3 are connected to the high-voltage side The drive signal of the switch Q6 is synchronized. Adjust the output gain by adjusting the duty cycle of Q7 and Q8. When the battery voltage is high or the DC bus voltage is low, the duty cycle of Q7 and Q8 increases to increase the gain; when the battery voltage is low or the DC bus voltage is high, Q7 The duty cycle of Q8 is reduced and the gain is reduced. The driving sequence of Q1 ~ Q8 is shown in Figure 3.
本发明的电路拓扑类似于传统的LLC电路,其功率较大,但在控制方案上,创新性的提出了同时控制调节原副边驱动的控制方案,PFM+固体导通时间的控制方案。该方案的核心思想在于:The circuit topology of the present invention is similar to the traditional LLC circuit, and its power is relatively large, but in terms of the control scheme, a control scheme for simultaneously controlling and adjusting the primary and secondary side driving, a PFM + solid on-time control scheme is innovatively proposed. The core idea of the program is:
1、单级的隔离DC/DC电路,通过创新的电路参数设计及其控制,可以实现宽增益高效率的能量传输。Q1~Q4实现ZCSZVS,开通和关断损耗接近于零,只有导通损耗;Q5~Q6实现ZCSZVS,开关损耗接近于零,只有导通损耗;Q7~Q8实现零电压开通ZVS;大大半导体器件的损耗,提高系统效率。1. Single-stage isolated DC / DC circuit, through innovative circuit parameter design and control, can achieve wide gain and high efficiency energy transmission. Q1 ~ Q4 realize ZCSZVS, turn-on and turn-off losses are close to zero, only conduction loss; Q5 ~ Q6 realize ZCSZVS, switching loss is close to zero, only conduction loss; Q7 ~ Q8 realize zero voltage turn-on ZVS; large semiconductor devices Loss, improve system efficiency.
2、通过变频控制,降低变压器原副边的无效电流,实现同样的能量传输,只需要更小变压器的原副边电流,降低了变压器的铜损,同时也减少了半导体器件的导通损耗,提高系统效率。2. Through frequency conversion control, reduce the invalid current of the primary and secondary sides of the transformer and achieve the same energy transmission. Only the primary and secondary current of the smaller transformer is needed, which reduces the copper loss of the transformer and reduces the conduction loss of the semiconductor device. Improve system efficiency.
该方案的有益效果在于:双向隔离DCDC电路,通过电路参数设计及先进的控制方法,实现了单级隔离DC/DC的宽增益高效率的能量传输。相比于传统的方案,减少了一级Buck/boost电路,提高了效率和减小了体积,降低了系统成本。The beneficial effects of this scheme are: bidirectional isolated DCDC circuit, through circuit parameter design and advanced control methods, to achieve a wide gain and high efficiency energy transmission of single-stage isolated DC / DC. Compared with the traditional scheme, the first-stage Buck / boost circuit is reduced, the efficiency is improved, the volume is reduced, and the system cost is reduced.
上述实施例只为说明本发明的技术构思及特点,其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施,并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰,都应涵盖在本发明的保护范围之内。The above embodiments are only for explaining the technical concept and features of the present invention, and the purpose thereof is to allow those familiar with the technology to understand the content of the present invention and implement it accordingly, but not to limit the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

  1. 一种双向隔离DC/DC电路,其特征在于:所述双向隔离DC/DC电路包括低压侧全桥架构、高压侧全桥架构、变压器、谐振电感和谐振电容;A bidirectional isolated DC / DC circuit, characterized in that the bidirectional isolated DC / DC circuit includes a low-voltage side full-bridge architecture, a high-voltage side full-bridge architecture, a transformer, a resonant inductor, and a resonant capacitor;
    所述低压侧全桥架构包括四颗低压侧开关管,分别为低压侧开关管Q1、低压侧开关管Q2、低压侧开关管Q3和低压侧开关管Q4,所述低压侧开关管Q1和所述低压侧开关管Q3串联构成低压侧第一桥臂,所述低压侧开关管Q2和所述低压侧开关管Q4串联构成低压侧第二桥臂;所述低压侧第一桥臂和所述低压侧第二桥臂并联的两端构成所述双向隔离DC/DC电路的低压侧输入输出端;The low-side full-bridge architecture includes four low-side switch tubes, which are a low-side switch tube Q1, a low-side switch tube Q2, a low-side switch tube Q3, and a low-side switch tube Q4, and the low-side switch tube Q1 and all The low-voltage side switch tube Q3 is connected in series to form a low-voltage side first bridge arm, the low-voltage side switch tube Q2 and the low-voltage side switch tube Q4 are connected in series to form a low-voltage side second bridge arm; the low-voltage side first bridge arm and the The two ends of the low voltage side second bridge arm connected in parallel constitute the low voltage side input and output terminals of the bidirectional isolated DC / DC circuit;
    所述高压侧全桥架构包括四颗高压侧开关管,分别为高压侧开关管Q5、高压侧开关管Q6、高压侧开关管Q7和高压侧开关管Q8,所述高压侧开关管Q5和所述高压侧开关管Q7串联构成高压侧第一桥臂,所述高压侧开关管Q6和所述高压侧开关管Q8串联构成高压侧第二桥臂;所述高压侧第一桥臂和所述高压侧第二桥臂并联的两端构成所述双向隔离DC/DC电路的高压侧输入输出端;The high-voltage side full-bridge architecture includes four high-voltage side switch tubes, which are a high-voltage side switch tube Q5, a high-voltage side switch tube Q6, a high-voltage side switch tube Q7, and a high-voltage side switch tube Q8, and the high-voltage side switch tube Q5 and all The high voltage side switch tube Q7 is connected in series to form a high voltage side first bridge arm, the high voltage side switch tube Q6 and the high voltage side switch tube Q8 are connected in series to form a high voltage side second bridge arm; the high voltage side first bridge arm and the The two ends of the second bridge arm on the high voltage side connected in parallel constitute the high voltage side input and output terminals of the bidirectional isolated DC / DC circuit;
    所述低压侧第一桥臂的中点和所述低压侧第二桥臂的中点连接至所述变压器的低压侧,所述变压器的高压侧经所述谐振电容后连接至所述高压侧第一桥臂的中点和所述高压侧第二桥臂的中点。The midpoint of the first bridge arm on the low voltage side and the midpoint of the second bridge arm on the low voltage side are connected to the low voltage side of the transformer, and the high voltage side of the transformer is connected to the high voltage side after the resonance capacitor The midpoint of the first bridge arm and the midpoint of the second bridge arm on the high voltage side.
  2. 根据权利要求1所述的双向隔离DC/DC电路,其特征在于:所述低压侧开关管采用MOSFET管。The bidirectional isolated DC / DC circuit according to claim 1, characterized in that the low-voltage side switch tube uses a MOSFET tube.
  3. 根据权利要求1所述的双向隔离DC/DC电路,其特征在于:所述高压侧开关管采用MOS管。The bidirectional isolated DC / DC circuit according to claim 1, wherein the high-voltage side switch tube is a MOS tube.
  4. 根据权利要求1所述的双向隔离DC/DC电路,其特征在于:所述谐振电感集成于所述变压器中。The bidirectional isolated DC / DC circuit according to claim 1, wherein the resonant inductor is integrated in the transformer.
  5. 根据权利要求4所述的双向隔离DC/DC电路,其特征在于:所述变压器中还集成有励磁电感。The bidirectional isolated DC / DC circuit according to claim 4, wherein a magnetizing inductance is further integrated in the transformer.
  6. 一种如权利要求1所述的双向隔离DC/DC电路采用的控制方法,其特征在于:所述控制方法为:A control method adopted by the bidirectional isolated DC / DC circuit according to claim 1, wherein the control method is:
    当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述低压侧开关管的驱动信号占空比为50%,所述低压侧开关管Q1和所述低压侧开关管Q4采用相同的驱动信号,所述低压侧开关管Q2和所述低压侧开关管Q3采用相同的驱动信号,且所述低压侧开关管Q1和所述低压侧开关管Q4的驱动信号与所述低压侧开关管Q2和所述低压侧开关管Q3的驱动信号互补;所述高压侧开关管Q7和高压侧开关管Q8具有相同的导通时间,且相位交错180°,所述高压侧开关管Q5的驱动信号与所述高压侧开关管Q7的驱动信号互补,所述高压侧开关管Q6的驱动信号与所述高压侧开关管Q8的驱动信号互补,所述高压侧开关管Q7的驱动信号相位与所述低压侧开关管Q2和所述低压侧开关管Q3的驱动信号相位相同,所述高压侧开关管Q8的驱动信号相位与所述低压侧开关管Q1和所述低压侧开关管Q4的驱动信号相位相同;When electric energy flows from the low-voltage side input-output terminal to the high-voltage side input-output terminal, the duty ratio of the driving signal of the low-voltage side switch tube is 50%, and the low-voltage side switch tube Q1 and the low-voltage side switch tube Q4 uses the same drive signal, the low-voltage switch Q2 and the low-voltage switch Q3 use the same drive signal, and the drive signals of the low-voltage switch Q1 and the low-voltage switch Q4 are the same as the The drive signals of the low-side switch Q2 and the low-side switch Q3 are complementary; the high-side switch Q7 and the high-side switch Q8 have the same on-time, and the phases are staggered by 180 °, and the high-side switch The drive signal of Q5 is complementary to the drive signal of the high-side switch Q7, the drive signal of the high-voltage switch Q6 is complementary to the drive signal of the high-voltage switch Q8, and the drive signal of the high-side switch Q7 The phase is the same as the drive signal phase of the low-voltage side switch tube Q2 and the low-voltage side switch tube Q3, and the drive signal phase of the high-voltage side switch tube Q8 is the same as the low-voltage side switch tube Q1 and the low-voltage side switch tube Q4 The same drive signal phase;
    当电能由所述高压侧输入输出端流向所述低压侧输入输出端时,所述高压侧开关管Q5的驱动信号和所述高压侧开关管Q6的驱动信号为PWM互补信号,所述高压侧开关管Q5的驱动信号与所述高压侧开关管Q8的驱动信号为同步的PWM信号,所述高压侧开关管Q6的驱动信号与所述高压侧开关管Q7的驱动信号为同步的PWM信号,所述低压侧开关管Q1的驱动信号和所述低压侧开关管Q4的驱动信号相同,所述低压侧开关管Q2的驱动信号和 所述低压侧开关管Q3的驱动信号相同,且所述低压侧开关管Q1的驱动信号和所述低压侧开关管Q4的驱动信号与所述高压侧开关管Q5的驱动信号同步,所述低压侧开关管Q2的驱动信号和所述低压侧开关管Q3的驱动信号与所述高压侧开关管Q6的驱动信号同步。When electric energy flows from the high-voltage side input-output end to the low-voltage side input-output end, the drive signal of the high-voltage side switch tube Q5 and the drive signal of the high-voltage side switch tube Q6 are PWM complementary signals, and the high-voltage side The drive signal of the switch Q5 and the drive signal of the high-voltage switch Q8 are synchronized PWM signals, the drive signal of the high-voltage switch Q6 and the drive signal of the high-voltage switch Q7 are synchronized PWM signals, The drive signal of the low-side switch Q1 is the same as the drive signal of the low-side switch Q4, the drive signal of the low-voltage switch Q2 is the same as the drive signal of the low-side switch Q3, and the low voltage The drive signal of the side switch tube Q1 and the drive signal of the low-voltage switch tube Q4 are synchronized with the drive signal of the high-voltage switch tube Q5, the drive signal of the low-voltage switch tube Q2 and the low-voltage switch tube Q3 The driving signal is synchronized with the driving signal of the high-voltage side switch tube Q6.
  7. 根据权利要求6所述的控制方法,其特征在于:当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述高压侧开关管Q7和高压侧开关管Q8的导通时间
    Figure PCTCN2018120173-appb-100001
    其中,Lr为谐振电感,Cr为谐振电容。
    The control method according to claim 6, characterized in that when electric energy flows from the low-voltage side input-output end to the high-voltage side input-output end, the conduction of the high-voltage side switch tube Q7 and the high-voltage side switch tube Q8 time
    Figure PCTCN2018120173-appb-100001
    Among them, Lr is the resonance inductance, Cr is the resonance capacitance.
  8. 根据权利要求6所述的控制方法,其特征在于:当电能由所述低压侧输入输出端流向所述高压侧输入输出端时,所述低压侧开关管和所述高压侧开关管的开关频率可调。The control method according to claim 6, characterized in that when electric energy flows from the low-voltage side input-output end to the high-voltage side input-output end, the switching frequency of the low-voltage side switch tube and the high-voltage side switch tube Adjustable.
  9. 根据权利要求6所述的控制方法,其特征在于:当电能由所述高压侧输入输出端流向所述低压侧输入输出端时,所述低压侧开关管和所述高压侧开关管的开关周期
    Figure PCTCN2018120173-appb-100002
    其中,Lr为谐振电感,Cr为谐振电容。
    The control method according to claim 6, characterized in that when electric energy flows from the high-voltage side input-output end to the low-voltage side input-output end, the switching period of the low-voltage side switch tube and the high-voltage side switch tube
    Figure PCTCN2018120173-appb-100002
    Among them, Lr is the resonance inductance, Cr is the resonance capacitance.
  10. 根据权利要求6所述的控制方法,其特征在于:所述高压侧开关管Q7的驱动信号的占空比和高压侧开关管Q8的驱动信号的占空比相同,且最大限值为50%。The control method according to claim 6, wherein the duty ratio of the driving signal of the high-side switch Q7 is the same as the duty ratio of the driving signal of the high-side switch Q8, and the maximum limit is 50% .
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