CN108988634A - A kind of two-way large velocity ratio dcdc converter of three-phase alternating expression and its control method - Google Patents
A kind of two-way large velocity ratio dcdc converter of three-phase alternating expression and its control method Download PDFInfo
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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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from DC input or output
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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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0077—Plural converter units whose outputs are connected in series
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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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
技术领域technical field
本发明属于电力电子技术领域，具体涉及一种三相交错式双向大变比DCDC变换器及其控制方法。The invention belongs to the technical field of power electronics, and in particular relates to a three-phase interleaved bidirectional DC-DC converter with large transformation ratio and a control method thereof.
背景技术Background technique
直流-直流变换器，简称DC-DC变换器，是将一种直流电源变换为其他具有不同输出特性的直流电源的电力电子装置。通过对电力电子器件的快速通断控制把恒定直流电压斩成一系列脉冲电压，通过控制占空比的变化改变这一系列脉冲系列的脉冲宽度，实现输出电压平均值的调节，得到目标直流电压。广泛应用于太阳能发电、不间断电源等领域。A DC-DC converter, referred to as a DC-DC converter, is a power electronic device that converts a DC power supply into other DC power supplies with different output characteristics. The constant DC voltage is chopped into a series of pulse voltages by fast on-off control of power electronic devices, and the pulse width of this series of pulse series is changed by controlling the change of the duty cycle to realize the adjustment of the average value of the output voltage and obtain the target DC voltage. Widely used in solar power generation, uninterruptible power supply and other fields.
传统双向直流变换器可以实现能量双向变换，在功能上相当于一个基本Boost变换器和一个基本Buck变换器，结构简单，成本低，无变压损耗的优点，但存在着输入电流和输出电流纹波大、容量小、滤波元件大等缺点。The traditional bidirectional DC converter can achieve bidirectional energy conversion, which is functionally equivalent to a basic Boost converter and a basic Buck converter. It has the advantages of simple structure, low cost, and no transformation loss, but there are input current and output current ripples. Large waves, small capacity, large filter components and other shortcomings.
目前，DCDC变换器的应用越来越广泛，已有三相交错并联双向DCDC变换器把三个电感电流交错并联，降低了输入电流纹波，有利于改善变换器的效率优化变换器的动态响应。但是，三相交错并联双向直流变换器没有提高变压比，难以适用于输入输出电压变换比大的场合。At present, DCDC converters are more and more widely used. There are three-phase interleaved parallel bidirectional DCDC converters that interleave three inductor currents in parallel to reduce the input current ripple, which is conducive to improving the efficiency of the converter and optimizing the dynamic response of the converter. However, the three-phase interleaved parallel bidirectional DC converter does not increase the transformation ratio, so it is difficult to apply to occasions where the input-to-output voltage transformation ratio is large.
发明内容Contents of the invention
针对上述问题，本发明提出一种三相交错式双向大变比DCDC变换器及其控制方法，用于降低电流纹波，提高变压比，实现直流电的转换。In view of the above problems, the present invention proposes a three-phase interleaved bidirectional DCDC converter with large transformation ratio and its control method, which are used to reduce current ripple, increase transformation ratio, and realize direct current conversion.
实现上述技术目的，达到上述技术效果，本发明通过以下技术方案实现：Realize above-mentioned technical purpose, reach above-mentioned technical effect, the present invention realizes through the following technical solutions:
第一方面，本发明提供了一种三相交错式双向大变比DCDC变换器，包括顺次相连的低压侧、桥臂单元和高压侧，所述桥臂单元包括顺次并联的第一桥臂模块、第二桥臂模块和第三桥臂模块；In the first aspect, the present invention provides a three-phase interleaved bidirectional DCDC converter with a large transformation ratio, including a low-voltage side, a bridge arm unit and a high-voltage side connected in sequence, and the bridge arm unit includes a first bridge connected in parallel in sequence arm module, the second bridge arm module and the third bridge arm module;
所述第一桥臂模块包括第一电感、第一开关管和第二开关管；The first bridge arm module includes a first inductor, a first switch tube, and a second switch tube;
所述第二桥臂模块包括第二电感、第三开关管和第四开关管；The second bridge arm module includes a second inductor, a third switch tube, and a fourth switch tube;
所述第三桥臂模块包括第三电感、第五开关管、第六开关管和第七开关管；The third bridge arm module includes a third inductor, a fifth switch tube, a sixth switch tube, and a seventh switch tube;
其中，所述第一电感、第二电感和第三电感的第一端均连接到低压侧的正端；所述第一电感、第二电感和第三电感的第二端分别与第一开关管、第三开关管和第五开关管的第一端相连；所述第一开关管、第三开关管、第五开关管的第二端和第七开关管的第一端均连接到低压侧的负端；所述低压侧的正端和负端分别用于与第一电源的正极和负极相连；Wherein, the first ends of the first inductance, the second inductance and the third inductance are all connected to the positive end of the low voltage side; the second ends of the first inductance, the second inductance and the third inductance are respectively connected to the first switch The first end of the first switch tube, the third switch tube, the fifth switch tube and the first end of the seventh switch tube are all connected to the low voltage The negative end of the side; the positive end and the negative end of the low-voltage side are respectively used to be connected to the positive pole and the negative pole of the first power supply;
所述第一电感、第二电感和第三电感的第二端还分别与第二开关管、第四开关管和第六开关管的第二端相连；所述第二开关管、第四开关管、第六开关管的第一端和第七开关管的第二端顺次分别连接到高压侧，其中第二开关管的第一端与高压侧的正端相连；所述第七开关管的第二端与高压侧的负端相连；所述高压侧的正端和负端分别用于与第二电源的正极和负极相连。The second ends of the first inductance, the second inductance and the third inductance are also respectively connected to the second ends of the second switch tube, the fourth switch tube and the sixth switch tube; the second switch tube, the fourth switch tube tube, the first end of the sixth switching tube and the second end of the seventh switching tube are respectively connected to the high voltage side in sequence, wherein the first end of the second switching tube is connected to the positive end of the high voltage side; the seventh switching tube The second terminal of the high voltage side is connected to the negative terminal; the positive terminal and the negative terminal of the high voltage side are respectively used to be connected to the positive pole and the negative pole of the second power supply.
优选地，所述低压侧包括低压侧电容；所述第一电感、第二电感和第三电感的第一端均连接到低压侧电容的正端；所述第一开关管、第三开关管、第五开关管的第二端和第七开关管的第一端均连接到低压侧电容的负端。Preferably, the low-voltage side includes a low-voltage side capacitor; the first ends of the first inductance, the second inductance, and the third inductance are all connected to the positive end of the low-voltage side capacitor; the first switch tube and the third switch tube , the second terminal of the fifth switching transistor and the first terminal of the seventh switching transistor are both connected to the negative terminal of the low-voltage side capacitor.
优选地，所述高压侧包括顺次设置的高压侧第一电容、高压侧第二电容和高压侧第三电容，所述高压侧第一电容设于第二开关管和第四开关管之间；所述高压侧第二电容设于第四开关管和第六开关管之间；所述高压侧第三电容设于第六开关管和第七开关管之间。Preferably, the high-voltage side includes a first capacitor on the high-voltage side, a second capacitor on the high-voltage side, and a third capacitor on the high-voltage side arranged in sequence, and the first capacitor on the high-voltage side is arranged between the second switch tube and the fourth switch tube The second capacitor on the high voltage side is set between the fourth switch tube and the sixth switch tube; the third capacitor on the high voltage side is set between the sixth switch tube and the seventh switch tube.
优选地，所述第一开关管、第二开关管、第三开关管、第五开关管和第七开关管均由晶体管并联体二极管组成，第四开关管和第六开关管均由两个反向并联的晶体管组成。Preferably, the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the seventh switch tube are all composed of transistor parallel body diodes, and the fourth switch tube and the sixth switch tube are both composed of two Composed of transistors connected in antiparallel.
优选地，所述第一开关管、第二开关管、第三开关管、第五开关管和第七开关管的第一端和第二端分别为集电极和发射极。Preferably, the first terminal and the second terminal of the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are collectors and emitters respectively.
优选地，所述第一开关管和第二开关管的驱动信号反相；所述第三开关管和第四开关管的驱动信号反相；所述第五开关管和第六开关管的驱动信号反相。Preferably, the drive signals of the first switch tube and the second switch tube are out of phase; the drive signals of the third switch tube and the fourth switch tube are out of phase; the driving signals of the fifth switch tube and the sixth switch tube are The signal is inverted.
优选地，所述第一开关管、第三开关管和第五开关管的驱动信号间隔120°。Preferably, the driving signals of the first switch tube, the third switch tube and the fifth switch tube are separated by 120°.
第二方面，本发明提供了一种三相交错式双向大变比DCDC变换器的控制方法，包括：In the second aspect, the present invention provides a control method for a three-phase interleaved bidirectional DCDC converter with large transformation ratio, including:
获取第二电源对第一电源进行充放电的控制需求；Obtaining a control requirement for the second power supply to charge and discharge the first power supply;
采样当前第一电源的电压和第二电源的电压；Sampling the current voltage of the first power supply and the voltage of the second power supply;
当第二电源电压低于基准值时，在一个控制周期中依次采用T1-T6时序控制第一方面中所述的三相交错式双向大变比DCDC变换器，使其工作在Boost模式，第一电源处于放电模式；When the second power supply voltage is lower than the reference value, the three-phase interleaved bidirectional DCDC converter with large transformation ratio described in the first aspect is sequentially controlled in a control cycle by T1-T6 sequence to make it work in Boost mode, the first - the power supply is in discharge mode;
当第二电源电压高于基准值时，在一个控制周期中依次采用T1’-T6’时序控制第一方面中所述的三相交错式双向大变比DCDC变换器，使其工作在Buck模式，第一电源处于充电模式。When the second power supply voltage is higher than the reference value, sequentially adopt T1'-T6' sequence to control the three-phase interleaved bidirectional DCDC converter with large transformation ratio described in the first aspect in one control cycle, so that it works in Buck mode , the first power supply is in charging mode.
优选地，所述第一开关管、第二开关管、第三开关管、第五开关管和第七开关管均由晶体管并联体二极管组成，第四开关管和第六开关管均由两个反向并联的晶体管组成；Preferably, the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the seventh switch tube are all composed of transistor parallel body diodes, and the fourth switch tube and the sixth switch tube are both composed of two Anti-parallel transistor composition;
当处于T1、T3和T5时序的控制下，所述第一开关管、第三开关管和第五开关管均导通，其余开关管均关断；When under the control of the sequence of T1, T3 and T5, the first switch tube, the third switch tube and the fifth switch tube are all turned on, and the other switch tubes are all turned off;
当处于T2时序的控制下，所述第一开关管、第四开关管、第五开关管和第六开关管均导通，其余开关管均关断；When under the control of the T2 sequence, the first switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are all turned on, and the remaining switch tubes are all turned off;
当处于T4时序的控制下，所述第一开关管、第三开关管、第六开关管和第七开关管均导通，其余开关管均关断；When under the control of the T4 sequence, the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all turned on, and the remaining switch tubes are all turned off;
当处于T6时序的控制下，所述第二开关管、第三开关管、第四开关管和第五开关管均导通，其余开关管均关断。Under the control of the T6 sequence, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are all turned on, and the other switch tubes are all turned off.
优选地，当处于T1’时序的控制下：所述第二开关管、第三开关管、第四开关管和第五开关管均导通，其余开关管均关断；Preferably, under the control of T1' timing: the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are all turned on, and the remaining switch tubes are all turned off;
当处于T3’时序的控制下，所述第一开关管、第四开关管、第五开关管、第六开关管均导通，其余开关管均关断；When under the control of the T3' sequence, the first switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube are all turned on, and the remaining switch tubes are all turned off;
当处于T5’时序的控制下，所述第一开关管、第三开关管、第六开关管和第七开关管均导通，其余开关管均关断；When under the control of the T5' sequence, the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all turned on, and the remaining switch tubes are all turned off;
当处于T2’、T4’和T6’时序的控制下，所述第一开关管、第三开关管、第五开关管均导通，其余开关管均关断。Under the control of the timing of T2', T4' and T6', the first switch tube, the third switch tube, and the fifth switch tube are all turned on, and the remaining switch tubes are all turned off.
本发明所提供的三相交错式DCDC变换器及其控制方法，可根据第二电源的电压值与基准值的差值进行双向变换，实现升降压变换，与现有技术相比，具有以下有益效果：The three-phase interleaved DCDC converter and its control method provided by the present invention can carry out bidirectional conversion according to the difference between the voltage value of the second power supply and the reference value, and realize buck-boost conversion. Compared with the prior art, it has the following advantages Beneficial effect:
(1)当三相交错式DCDC变换器工作在Boost方向时，输入端进行交错并联减小了输入电流纹波，输出端进行交错串联提高了升压变比；当三相交错式DCDC变换器工作在Buck方向时，输入端进行交错串联，输出端进行交错并联，具有较大的降压变比，同时减小了输出电流纹波。(1) When the three-phase interleaved DCDC converter works in the Boost direction, the input terminal is interleaved in parallel to reduce the input current ripple, and the output terminal is interleaved in series to increase the boost ratio; when the three-phase interleaved DCDC converter When working in the Buck direction, the input ends are staggered in series, and the output ends are staggered in parallel, which has a large step-down ratio and reduces the output current ripple.
(2)在两种工作模式下，第一开关管S1、第三开关管S2、第五开关管S3和第六开关管S7(S7’)承受的最大电压应力为高压侧电压的1/3，第七开关管S5和第四开关管S6(S6’)承受的最大电压应力为高压侧电压的2/3，第二开关管S4承受的最大电压应力等于高压侧电压，功率器件的电压应力得到了降低，因此可以选用容量较小的储能元件，更适用于大功率场合，利于延长蓄电池使用寿命。(2) In the two working modes, the maximum voltage stress of the first switch tube S1, the third switch tube S2, the fifth switch tube S3 and the sixth switch tube S7 (S7') is 1/3 of the high voltage side voltage , the maximum voltage stress of the seventh switching tube S5 and the fourth switching tube S6 (S6') is 2/3 of the high-voltage side voltage, the maximum voltage stress of the second switching tube S4 is equal to the high-voltage side voltage, and the voltage stress of the power device has been reduced, so energy storage elements with smaller capacity can be selected, which is more suitable for high-power occasions and is beneficial to prolong the service life of the battery.
(3)电感储能和释能两种状态的转换，以及每个开关管中的电流在IGBT和体二极管中转换，使得功率回路不一致，有利于功率管分散散热，降低散热要求，提高系统应用的可靠性。(3) The conversion of the two states of inductive energy storage and energy release, and the conversion of the current in each switch tube between the IGBT and the body diode, makes the power loop inconsistent, which is conducive to the dispersed heat dissipation of the power tube, reduces the heat dissipation requirement, and improves the system application reliability.
(4)能够实现能量双向流动，有利于系统控制稳定；驱动对称控制，控制方案简单。(4) The two-way flow of energy can be realized, which is beneficial to the stability of the system control; the drive is symmetrically controlled, and the control scheme is simple.
附图说明Description of drawings
图1为本发明一种实施例中的三相交错式双向大变比DCDC变换器的拓扑图；Fig. 1 is a topological diagram of a three-phase interleaved bidirectional DCDC converter with large transformation ratio in an embodiment of the present invention;
图2为本发明一种实施例中第二电源电压低于基准值时的Boost电路的时序图；Fig. 2 is a timing diagram of the Boost circuit when the second power supply voltage is lower than the reference value in an embodiment of the present invention;
图3为本发明一种实施例中第二电源电压高于基准值时的Buck电路的时序图；3 is a timing diagram of the Buck circuit when the second power supply voltage is higher than the reference value in an embodiment of the present invention;
图4为图2中T1、T3、T5时序电流流向图；Fig. 4 is T1, T3, T5 sequential current flow diagram in Fig. 2;
图5为图2中T2时序电流流向图；Fig. 5 is the T2 sequence current flow diagram in Fig. 2;
图6为图2中T4时序电流流向图；Fig. 6 is T4 timing current flow chart in Fig. 2;
图7为图2中T6时序电流流向图；Fig. 7 is the T6 sequence current flow diagram in Fig. 2;
图8为图3中T1’时序电流流向图；Fig. 8 is T1' sequential current flow diagram in Fig. 3;
图9为图3中T3’时序电流流向图；Fig. 9 is T3' sequential current flow diagram among Fig. 3;
图10为图3中T5’时序电流流向图；Fig. 10 is T5' sequential current flow diagram among Fig. 3;
图11为图3中T2’、T4’、T6’时序电流流向。Figure 11 shows the sequential current flow of T2', T4', T6' in Figure 3.
具体实施方式Detailed ways
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
下面结合附图对本发明的应用原理作详细的描述。The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
实施例1Example 1
本发明实施例提供了一种三相交错式双向大变比DCDC变换器，图1为本发明实施例提供的一种三相交错式双向大变比DCDC变换器的拓扑图。如图1所示，该三相交错式双向大变比DCDC变换器包括：低压侧电容CL、桥臂单元(分别为第一桥臂模块、第二桥臂模块和第三桥臂模块)和与第一桥臂模块、第二桥臂模块和第三桥臂模块连接的高压侧电容(分别记为高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3)。所述高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3的参数均相同。An embodiment of the present invention provides a three-phase interleaved bidirectional DCDC converter with a large transformation ratio. FIG. 1 is a topology diagram of a three-phase interleaved bidirectional large transformation ratio DCDC converter provided by an embodiment of the present invention. As shown in Figure 1, the three-phase interleaved bidirectional DCDC converter with large transformation ratio includes: low-voltage side capacitor CL, bridge arm units (respectively the first bridge arm module, the second bridge arm module and the third bridge arm module) and The high voltage side capacitors connected to the first bridge arm module, the second bridge arm module and the third bridge arm module (respectively denoted as the first high voltage side capacitor CH1, the second high voltage side capacitor CH2 and the third high voltage side capacitor CH3). The parameters of the first capacitor CH1 at the high voltage side, the second capacitor CH2 at the high voltage side and the third capacitor CH3 at the high voltage side are all the same.
第一桥臂模块包括第一电感L1、第一开关管S1，第二开关管S4；所述第二桥臂模块包括第二电感L2、第三开关管S2，第四开关管(由S6和S6’反向并联组成)，第三桥臂模块包括第三电感L3、第五开关管S3、第六开关管(由S7和S7’反向并联组成)和第七开关管S5；其中，每个桥臂模块上的电感参数均相同。The first bridge arm module includes a first inductor L1, a first switch tube S1, and a second switch tube S4; the second bridge arm module includes a second inductor L2, a third switch tube S2, and a fourth switch tube (by S6 and S6' anti-parallel connection), the third bridge arm module includes the third inductor L3, the fifth switch tube S3, the sixth switch tube (composed of S7 and S7' anti-parallel connection) and the seventh switch tube S5; wherein, each The inductance parameters on each bridge arm module are the same.
在本发明实施例的一种具体实施方式中，具体连接关系如下：In a specific implementation manner of the embodiment of the present invention, the specific connection relationship is as follows:
1)所述第一桥臂模块的具体连接关系为：第一桥臂模块中的第一开关管S1的集电极与第一桥臂的第二开关管S4的发射极相连，并连接第一桥臂的第一电感L1的第二端，第二开关管S4的集电极与高压侧第一电容CH1的第一端连接。需要说明的是，高压侧第一电容CH1是有极性的，高压侧第一电容CH1的第一端为正极，高压侧第一电容CH1的第二端为负极。1) The specific connection relationship of the first bridge arm module is: the collector of the first switching tube S1 in the first bridge arm module is connected to the emitter of the second switching tube S4 of the first bridge arm, and connected to the first The second end of the first inductor L1 of the bridge arm, the collector of the second switching transistor S4 is connected to the first end of the first capacitor CH1 on the high voltage side. It should be noted that the first capacitor CH1 on the high-voltage side has polarity, the first terminal of the first capacitor CH1 on the high-voltage side is positive, and the second terminal of the first capacitor CH1 on the high-voltage side is negative.
2)所述第二桥臂模块的具体连接关系为：第二桥臂模块的第三开关管S2的集电极与第二桥臂模块的第四开关管(由S6和S6’反向并联组成)中的S6的集电极相连，并连接第二桥臂模块的第二电感L2的第二端，第四开关管中的S6的发射极与高压侧第二电容CH2的第一端连接。需要说明的是，高压侧第二电容CH2是有极性的，高压侧第二电容CH2的第一端为正极，高压侧第二电容CH2的第二端为负极。2) The specific connection relationship of the second bridge arm module is: the collector of the third switch tube S2 of the second bridge arm module and the fourth switch tube of the second bridge arm module (composed of S6 and S6' antiparallel connection ) is connected to the collector of S6 and connected to the second end of the second inductor L2 of the second bridge arm module, and the emitter of S6 in the fourth switching tube is connected to the first end of the second capacitor CH2 on the high voltage side. It should be noted that the second capacitor CH2 on the high voltage side has polarity, the first terminal of the second capacitor CH2 on the high voltage side is a positive pole, and the second terminal of the second capacitor CH2 on the high voltage side is a negative pole.
3)所述第三桥臂模块的具体连接关系为：第三桥臂模块的第五开关管S3的集电极与第三桥臂模块的第六开关管(由S7和S7’反向并联组成)中的S7的集电极相连，并连接第三桥臂的第三电感L3的第二端，第六开关管中的S7的发射极与高压侧第三电容CH3的第一端连接。需要说明的是，高压侧第三电容CH3是有极性的，高压侧第三电容CH3的第一端为正极，高压侧第三电容CH3的第二端为负极。3) The specific connection relationship of the third bridge arm module is: the collector of the fifth switch tube S3 of the third bridge arm module and the sixth switch tube of the third bridge arm module (composed of S7 and S7' antiparallel connection ) is connected to the collector of S7 and connected to the second end of the third inductor L3 of the third bridge arm, and the emitter of S7 in the sixth switching tube is connected to the first end of the third capacitor CH3 on the high voltage side. It should be noted that the third capacitor CH3 on the high-voltage side has polarity, the first terminal of the third capacitor CH3 on the high-voltage side is positive, and the second terminal of the third capacitor CH3 on the high-voltage side is negative.
第一桥臂模块对应的高压侧第一电容CH1的第二端与第二桥臂模块对应的高压侧第二电容CH2的第一端相连，第二桥臂模块对应的高压侧第二电容CH2的第二端与第三桥臂模块对应的高压侧第三电容CH3的第一端相连，第三桥臂模块对应的高压侧第三电容CH3的第二端与第三桥臂模块中的第七开关管S5的发射极相连。The second terminal of the first capacitor CH1 on the high-voltage side corresponding to the first bridge arm module is connected to the first end of the second capacitor CH2 on the high-voltage side corresponding to the second bridge arm module, and the second terminal of the high-voltage side second capacitor CH2 corresponding to the second bridge arm module The second end of the third bridge arm module is connected to the first end of the third capacitor CH3 on the high voltage side corresponding to the third bridge arm module, and the second end of the third bridge arm module corresponding to the high voltage side third capacitor CH3 is connected to the first end of the third bridge arm module. The emitters of the seven switch tubes S5 are connected.
第一桥臂模块中的第一开关管S1的发射极、第二桥臂模块中的第三开关管S2的发射极与第三桥臂模块中的第五开关管S3的发射极相连，作为第一电源的负端，第一桥臂模块中的第一电感L1的第一端、第二桥臂模块中的第二电感L2的第一端与第三桥臂模块中的第三电感L3的第一端相连，作为第一电源的正端。The emitter of the first switching tube S1 in the first bridge arm module, the emitter of the third switching tube S2 in the second bridge arm module are connected to the emitter of the fifth switching tube S3 in the third bridge arm module, as The negative end of the first power supply, the first end of the first inductor L1 in the first bridge arm module, the first end of the second inductor L2 in the second bridge arm module, and the third inductor L3 in the third bridge arm module connected to the first terminal as the positive terminal of the first power supply.
第一桥臂模块对应的高压侧第一电容CH1的第一端作为第二电源的正端，第三桥臂模块对应的高压侧第三电容CH3的第二端作为第二电源的负端。The first terminal of the first capacitor CH1 on the high voltage side corresponding to the first bridge arm module is used as the positive terminal of the second power supply, and the second terminal of the third capacitor CH3 on the high voltage side corresponding to the third bridge arm module is used as the negative terminal of the second power supply.
需要说明的是，图1中的拓扑结构中的第一电源为蓄电池组，第二电源为直流母线，但是具体实施中，第一电源和第二电源可以具体情况选取，并不只限于图1中所示的场景。It should be noted that the first power source in the topological structure in Figure 1 is a storage battery pack, and the second power source is a DC bus. the scene shown.
实施例2Example 2
基于实施例1中的三相交错式双向大变比DCDC变换器，可以实现以下两种变换：Based on the three-phase interleaved bidirectional DCDC converter with a large transformation ratio in Embodiment 1, the following two transformations can be realized:
1、当第二电源电压低于基准值时构造Boost电路，实现对第一电源放电；1. When the voltage of the second power supply is lower than the reference value, a Boost circuit is constructed to discharge the first power supply;
2、当第二电源电压高于基准值时构造Buck电路，实现对第一电源充电；2. When the voltage of the second power supply is higher than the reference value, a Buck circuit is constructed to charge the first power supply;
本发明实施例提供了一种三相交错式双向大变比DCDC变换器的控制方法，为了让本领域技术人员更加清楚本发明所提供的DCDC双向变换器的控制方法，以下结合开关管的控制时序和附图，对控制方法作进一步说明。The embodiment of the present invention provides a control method of a three-phase interleaved bidirectional large ratio DCDC converter. In order to make the control method of the DCDC bidirectional converter provided by the present invention more clear to those skilled in the art, the control of the switching tube is combined below Timing sequence and drawings, further explain the control method.
1、当第二电源电压低于基准值时构造Boost电路，实现对第一电源的放电控制，控制方法具体为：1. When the voltage of the second power supply is lower than the reference value, a Boost circuit is constructed to realize the discharge control of the first power supply. The specific control method is as follows:
当需要控制第一电源的放电，且第二电源电压低于基准值时，在一个开关周期内依次采用如图2所示的T1、T2、T3、T4、T5、T6时序控制所述三相交错式双向大变比DCDC变换器，具体如下：When it is necessary to control the discharge of the first power supply and the voltage of the second power supply is lower than the reference value, the three phases are sequentially controlled by T1, T2, T3, T4, T5, T6 as shown in Figure 2 within one switching cycle Interleaved bidirectional DCDC converter with large transformation ratio, as follows:
T1、T3、T5时序：第一桥臂模块中的第一开关管、第二桥臂模块中的第三开关管和第三桥臂模块中的第五开关管均导通，其余开关管均关断。如图4所示，此时，电流流向为，低压侧电容CL的第一端(即第一电源的正端)通过第一桥臂模块中的第一电感L1、第一桥臂模块中的第一开关管S1，至低压侧电容CL的第二端(即第一电源的负端)；低压侧电容CL的第一端通过第二桥臂模块中的第二电感L2、第二桥臂模块中的第三开关管S2，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第三桥臂模块中的第三电感L3、第三桥臂模块中的第五开关管S3，至低压侧电容CL的第二端。定义第一桥臂模块中的第一电感L1的电流方向从左向右为电流“正”流向，第二桥臂模块中的第二电感L2的电流方向从左向右为电流“正”流向，第三桥臂模块中的第三电感L3的电流方向从左向右为电流“正”流向，在下文中均采用该定义。该过程中，第一桥臂模块中的第一电感L1、第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3的电流均为“正”流向，且电流逐渐增大，第一桥臂模块中的第一电感L1、第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均储能，直到下一时序。T1, T3, T5 timing: the first switching tube in the first bridge arm module, the third switching tube in the second bridge arm module, and the fifth switching tube in the third bridge arm module are all turned on, and the remaining switching tubes are all turned on. off. As shown in Figure 4, at this time, the current flow direction is that the first terminal of the low-voltage side capacitor CL (that is, the positive terminal of the first power supply) passes through the first inductor L1 in the first bridge arm module, the first inductor L1 in the first bridge arm module, The first switching tube S1 is connected to the second terminal of the low-voltage side capacitor CL (that is, the negative terminal of the first power supply); the first terminal of the low-voltage side capacitor CL passes through the second inductor L2 in the second bridge arm module, the second bridge arm The third switching tube S2 in the module is connected to the second end of the low-voltage side capacitor CL; the first end of the low-voltage side capacitor CL passes through the third inductor L3 in the third bridge arm module and the fifth switch in the third bridge arm module The tube S3 is connected to the second terminal of the low voltage side capacitor CL. Define that the current direction of the first inductor L1 in the first bridge arm module is from left to right as the current "positive" flow direction, and the current direction of the second inductor L2 in the second bridge arm module is from left to right as the current "positive" flow direction , the current direction of the third inductor L3 in the third bridge arm module is from left to right as the "positive" current flow direction, and this definition is adopted hereinafter. During this process, the currents of the first inductor L1 in the first bridge arm module, the second inductor L2 in the second bridge arm module, and the third inductor L3 in the third bridge arm module all flow in the "positive" direction, and the current Gradually increasing, the first inductor L1 in the first bridge arm module, the second inductor L2 in the second bridge arm module, and the third inductor L3 in the third bridge arm module all store energy until the next time sequence.
高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3首尾相连，电流由第一电容CH1的第一端流向第二电源的正端，从第二电源的负端流回第三电容CH3的负端，定义高压侧第一电容CH1的电流方向从上向下为电流“正”流向，高压侧第二电容CH2的电流方向从上向下为电流“正”流向，高压侧第三电容CH3的电流方向从上向下为电流“正”流向，在下文中均采用该定义。该过程中，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3释能，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3均为“负”流向，且电流逐渐减小，向第二电源充电，直到下一时序。The first capacitor CH1 on the high voltage side, the second capacitor CH2 on the high voltage side and the third capacitor CH3 on the high voltage side are connected end to end, the current flows from the first end of the first capacitor CH1 to the positive end of the second power supply, and flows back from the negative end of the second power supply The negative terminal of the third capacitor CH3 defines that the current direction of the first capacitor CH1 on the high-voltage side is "positive" from top to bottom, and the current direction of the second capacitor CH2 on the high-voltage side is "positive" from top to bottom. The current direction of the third side capacitor CH3 is from top to bottom as the "positive" current flow direction, and this definition is adopted hereinafter. During this process, the first high-voltage side capacitor CH1, the second high-voltage side capacitor CH2, and the third high-voltage side capacitor CH3 release energy, and the first high-voltage side capacitor CH1, the second high-voltage side capacitor CH2, and the third high-voltage side capacitor CH3 are all " Negative" flow direction, and the current gradually decreases, charging the second power supply until the next sequence.
T2时序：第一桥臂模块中的第一开关管、第二桥臂模块中的第四开关管、第三桥臂模块中的第五开关管和第六开关管均导通，其余开关管均关断。如图5所示，此时，电流流向为，低压侧电容CL的第一端通过第一桥臂模块中的第一电感L1、第一桥臂模块中的第一开关管S1，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第二桥臂模块中的第二电感L2、第二桥臂模块中的第四开关管中的S6、高压侧第二电容CH2、第三桥臂模块中的第六开关管中的S7’、第三桥臂模块中的第五开关管S3，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第三桥臂模块中的第三电感L3、第三桥臂模块中的第五开关管S3，至低压侧电容CL的第二端。该过程中，第一桥臂模块中的第一电感L1和第三桥臂模块中的第三电感L3均为“正”流向，且电流逐渐增大，第一桥臂模块中的第一电感L1和第三桥臂模块中的第三电感L3均储能，第二桥臂模块中的第二电感L2的电流为“正”流向，但电流逐渐减小，、第二桥臂模块中的第二电感L2释能，向高压侧第二电容CH2充电，直到下一时序。T2 sequence: the first switching tube in the first bridge arm module, the fourth switching tube in the second bridge arm module, the fifth switching tube and the sixth switching tube in the third bridge arm module are all turned on, and the remaining switching tubes Both are off. As shown in Figure 5, at this time, the current flow direction is that the first end of the low-voltage side capacitor CL passes through the first inductor L1 in the first bridge arm module and the first switch tube S1 in the first bridge arm module, to the low-voltage side The second end of the capacitor CL; the first end of the low-voltage side capacitor CL passes through the second inductor L2 in the second bridge arm module, S6 in the fourth switch tube in the second bridge arm module, the second capacitor CH2 on the high-voltage side, S7' in the sixth switching tube in the third bridge arm module, the fifth switching tube S3 in the third bridge arm module, to the second end of the low-voltage side capacitor CL; the first end of the low-voltage side capacitor CL passes through the third The third inductor L3 in the bridge arm module, the fifth switching transistor S3 in the third bridge arm module, and the second terminal of the low voltage side capacitor CL. During this process, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both flow in the "positive" direction, and the current gradually increases, the first inductor in the first bridge arm module Both L1 and the third inductor L3 in the third bridge arm module store energy, the current of the second inductor L2 in the second bridge arm module flows in a "positive" direction, but the current gradually decreases, and the second inductor L2 in the second bridge arm module The second inductor L2 discharges energy and charges the second capacitor CH2 on the high voltage side until the next time sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第一电容CH1的第一端流向第二电源的正端，从第二电源的负端流回第三电容CH3的负端。该过程中，第一电容CH1、第二电容CH2和第三电容CH3释能，第一电容CH1、第二电容CH2和第三电容CH3均为“负”流向，且电流逐渐减小，向第二电源充电，直到下一时序。The first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 on the high voltage side are connected end to end, the current flows from the first end of the first capacitor CH1 to the positive end of the second power supply, and flows back from the negative end of the second power supply to the third capacitor CH3 negative terminal. During this process, the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 release energy, and the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 all flow in a "negative" direction, and the current gradually decreases to the second capacitor. Two power sources are charged until the next sequence.
T4时序：第一桥臂模块中的第一开关管、第二桥臂模块中的第三开关管、第三桥臂模块中的第六开关管和第七开关管均导通，其余开关管均关断。如图6所示，此时，电流流向为，低压侧电容CL的第一端通过第一桥臂模块中的第一电感L1、第一桥臂模块中的第一开关管S1，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第二桥臂模块中的第二电感L2、第二桥臂模块中的第三开关管S2，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第三桥臂模块中的第三电感L3、第三桥臂模块中的第六开关管中的S7、高压侧第三电容CH3、第三桥臂模块中的第七开关管S5的体二极管D5，至低压侧电容CL的第二端。该过程中，第一桥臂模块中的第一电感L1和第二桥臂模块中的第二电感L2均为“正”流向，且电流逐渐增大，第一桥臂模块中的第一电感L1和第二桥臂模块中的第二电感L2均储能，第三桥臂模块中的第三电感L3的电流为“正”流向，但电流逐渐减小，第三桥臂模块中的第三电感L3释能，向高压侧第三电容CH3充电，直到下一时序。T4 timing: the first switching tube in the first bridge arm module, the third switching tube in the second bridge arm module, the sixth switching tube and the seventh switching tube in the third bridge arm module are all turned on, and the remaining switching tubes Both are off. As shown in Figure 6, at this time, the current flow direction is that the first end of the low-voltage side capacitor CL passes through the first inductor L1 in the first bridge arm module and the first switch tube S1 in the first bridge arm module, to the low-voltage side The second end of the capacitor CL; the first end of the low-voltage side capacitor CL passes through the second inductor L2 in the second bridge arm module and the third switch tube S2 in the second bridge arm module to the second end of the low-voltage side capacitor CL ; The first end of the low-voltage side capacitor CL passes through the third inductor L3 in the third bridge arm module, S7 in the sixth switch tube in the third bridge arm module, the third capacitor CH3 on the high-voltage side, and the third bridge arm module. The body diode D5 of the seventh switching transistor S5 is connected to the second terminal of the low voltage side capacitor CL. During this process, the first inductor L1 in the first bridge arm module and the second inductor L2 in the second bridge arm module both flow in the "positive" direction, and the current gradually increases, the first inductor in the first bridge arm module Both L1 and the second inductor L2 in the second bridge arm module store energy, the current of the third inductor L3 in the third bridge arm module flows in a "positive" direction, but the current gradually decreases, and the third inductor L3 in the third bridge arm module The three inductors L3 release energy to charge the third capacitor CH3 on the high voltage side until the next sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第一电容CH1的第一端流向第二电源的正端，从第二电源的负端流回第三电容CH3的负端。该过程中，第一电容CH1、第二电容CH2和第三电容CH3释能，第一电容CH1、第二电容CH2和第三电容CH3均为“负”流向，且电流逐渐减小，向第二电源充电，直到下一时序。The first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 on the high voltage side are connected end to end, the current flows from the first end of the first capacitor CH1 to the positive end of the second power supply, and flows back from the negative end of the second power supply to the third capacitor CH3 negative terminal. During this process, the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 release energy, and the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 all flow in a "negative" direction, and the current gradually decreases to the second capacitor. Two power sources are charged until the next sequence.
T6时序：第一桥臂模块中的第二开关管、第二桥臂模块中的第三、第四开关管和第三桥臂模块中的第五开关管均导通，其余开关管均关断。如图7所示，此时，电流流向为，低压侧电容CL的第一端通过第一桥臂模块中的第一电感L1、第一桥臂模块中的第二开关管S4的体二极管D4、高压侧第一电容CH1、第二桥臂模块中第四开关管中的S6’、第二桥臂模块中的第三开关管S2，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第二桥臂模块中的第二电感L2、第二桥臂模块中的第三开关管S2，至低压侧电容CL的第二端；低压侧电容CL的第一端通过第三桥臂模块中的第三电感L3、第三桥臂模块中的第五开关管S3，至低压侧电容CL的第二端。该过程中，第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均为“正”流向，且电流逐渐增大，第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均储能，第一桥臂模块中的第一电感L1的电流为“正”流向，但电流逐渐减小，第一桥臂模块中的第一电感L1释能，向高压侧第一电容CH1充电，直到下一时序。T6 timing: the second switch tube in the first bridge arm module, the third and fourth switch tubes in the second bridge arm module, and the fifth switch tube in the third bridge arm module are all turned on, and the rest of the switch tubes are all turned off broken. As shown in Figure 7, at this time, the current flow direction is that the first end of the low voltage side capacitor CL passes through the first inductor L1 in the first bridge arm module and the body diode D4 of the second switch tube S4 in the first bridge arm module , the first capacitor CH1 on the high-voltage side, S6' in the fourth switch tube in the second bridge arm module, the third switch tube S2 in the second bridge arm module, to the second end of the low-voltage side capacitor CL; the low-voltage side capacitor CL The first end of the low-voltage side capacitor CL passes through the second inductor L2 in the second bridge arm module and the third switch tube S2 in the second bridge arm module; the first end of the low-voltage side capacitor CL passes through the second The third inductor L3 in the three-leg module, the fifth switching transistor S3 in the third-leg module, and the second terminal of the low-voltage side capacitor CL. During this process, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module both flow in the "positive" direction, and the current gradually increases, the second inductor in the second bridge arm module Both L2 and the third inductor L3 in the third bridge arm module store energy, the current of the first inductor L1 in the first bridge arm module is in the "positive" flow direction, but the current gradually decreases, and the first inductor L1 in the first bridge arm module An inductor L1 discharges energy to charge the first capacitor CH1 at the high voltage side until the next sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第一电容CH1的第一端流向第二电源的正端，从第二电源的负端流回第三电容CH3的负端。该过程中，第一电容CH1、第二电容CH2和第三电容CH3释能，第一电容CH1、第二电容CH2和第三电容CH3均为“负”流向，且电流逐渐减小，向第二电源充电，直到下一时序。The first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 on the high voltage side are connected end to end, the current flows from the first end of the first capacitor CH1 to the positive end of the second power supply, and flows back from the negative end of the second power supply to the third capacitor CH3 negative terminal. During this process, the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 release energy, and the first capacitor CH1, the second capacitor CH2, and the third capacitor CH3 all flow in a "negative" direction, and the current gradually decreases to the second capacitor. Two power sources are charged until the next sequence.
2、当第二电源电压高于基准值时构造Buck电路，实现对第一电源的充电控制，方法如下：2. When the voltage of the second power supply is higher than the reference value, construct a Buck circuit to realize the charging control of the first power supply. The method is as follows:
T1’时序：第一桥臂模块中第二开关管、第二桥臂模块中第三、第四开关管和第三桥臂模块中第五开关管均导通，其余开关管均关断。如图8所示，此时，电流流向为，高压侧第一电容CH1的第一端通过第一桥臂模块中的第二开关管S4、第一桥臂模块中的第一电感L1、低压侧电容CL、第二桥臂模块中的第三开关管S2的体二极管D2、第二桥臂模块中第四开关管中的S6回至高压侧第一电容CH1的第二端；第二桥臂模块中第二电感L2通过低压侧电容CL、第二桥臂模块中的第三开关管S2的体二极管D2回至第二桥臂模块中第二电感L2进行释能；第三桥臂模块中第三电感L3通过低压侧电容CL、第三桥臂模块中的第五开关管S3的体二极管D3回至第三桥臂模块中第三电感L3进行释能。该过程中，第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均为“负”流向，且电流逐渐减小，向第一电源充电，第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均释能，第一桥臂模块中的第一电感L1的电流为“负”流向，但电流逐渐增大，第一桥臂模块中的第一电感L1储能，高压侧第一电容CH1向第一桥臂模块中第一电感L1和第一电源充电，直到下一时序。T1' sequence: the second switch tube in the first bridge arm module, the third and fourth switch tubes in the second bridge arm module, and the fifth switch tube in the third bridge arm module are all turned on, and the other switch tubes are all turned off. As shown in Figure 8, at this time, the current flow direction is that the first end of the first capacitor CH1 on the high voltage side passes through the second switch tube S4 in the first bridge arm module, the first inductor L1 in the first bridge arm module, the low voltage The side capacitor CL, the body diode D2 of the third switch tube S2 in the second bridge arm module, and S6 in the fourth switch tube in the second bridge arm module return to the second end of the first capacitor CH1 on the high voltage side; the second bridge The second inductor L2 in the arm module returns to the second inductor L2 in the second bridge arm module through the low-voltage side capacitor CL and the body diode D2 of the third switching tube S2 in the second bridge arm module to release energy; the third bridge arm module The third inductor L3 returns to the third inductor L3 in the third bridge arm module through the low-voltage side capacitor CL and the body diode D3 of the fifth switching transistor S3 in the third bridge arm module to release energy. During this process, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module both flow in the "negative" direction, and the current gradually decreases to charge the first power supply, and the second bridge arm Both the second inductor L2 in the module and the third inductor L3 in the third bridge arm module release energy, the current of the first inductor L1 in the first bridge arm module flows in a "negative" direction, but the current gradually increases, the first The first inductor L1 in the bridge arm module stores energy, and the first capacitor CH1 at the high voltage side charges the first inductor L1 in the first bridge arm module and the first power supply until the next timing sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第二电源的正端通过高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3流回第二电源的负端。该过程中，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3均储能，电流均为“正”流向，且电流逐渐增大，直到下一时序。The first capacitor CH1 on the high voltage side, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and the current flows back from the positive terminal of the second power supply through the first capacitor CH1 on the high voltage side, the second capacitor CH2 on the high voltage side and the third capacitor CH3 on the high voltage side The negative terminal of the second power supply. During this process, the first capacitor CH1 at the high voltage side, the second capacitor CH2 at the high voltage side, and the third capacitor CH3 at the high voltage side all store energy, and the currents all flow in a "positive" direction, and the current gradually increases until the next sequence.
T3’时序：第一桥臂模块中第一开关管、第二桥臂模块中第四开关管和第三桥臂模块中第五、第六开关管均导通，其余开关管均关断。如图9所示，此时，电流流向为，第一桥臂模块中第一电感L1通过低压侧电容CL、第一桥臂模块中的第一开关管S1的体二极管D1回至第一桥臂模块中第一电感L1进行释能；高压侧第二电容CH2的第一端通过第二桥臂模块中的第四开关管中的S6’、第二桥臂模块中的第二电感L2、低压侧电容CL、第三桥臂模块中的第五开关管S3的体二极管D3、第三桥臂模块中第六开关管中的S7回至高压侧第二电容CH2的第二端；第三桥臂模块中第三电感L3通过低压侧电容CL、第三桥臂模块中的第五开关管S3的体二极管D3回至第三桥臂模块中第三电感L3进行释能。该过程中，第一桥臂模块中的第一电感L1和第三桥臂模块中的第三电感L3均为“负”流向，且电流逐渐减小，向第一电源充电，第一桥臂模块中的第一电感L1和第三桥臂模块中的第三电感L3均释能，第二桥臂模块中的第二电感L2的电流为“负”流向，但电流逐渐增大，第二桥臂模块中的第二电感L2储能，高压侧第二电容CH2向第二桥臂模块中第二电感L2和第一电源充电，直到下一时序。T3' sequence: the first switching tube in the first bridge arm module, the fourth switching tube in the second bridge arm module, the fifth and sixth switching tubes in the third bridge arm module are all turned on, and the remaining switching tubes are all turned off. As shown in Figure 9, at this time, the current flow direction is that the first inductor L1 in the first bridge arm module returns to the first bridge through the low-voltage side capacitor CL, and the body diode D1 of the first switching transistor S1 in the first bridge arm module. The first inductor L1 in the arm module releases energy; the first end of the second capacitor CH2 on the high-voltage side passes through S6' in the fourth switch tube in the second bridge arm module, the second inductor L2 in the second bridge arm module, The low-voltage side capacitor CL, the body diode D3 of the fifth switch tube S3 in the third bridge arm module, and S7 in the sixth switch tube in the third bridge arm module return to the second end of the second capacitor CH2 on the high-voltage side; the third The third inductor L3 in the bridge arm module returns to the third inductor L3 in the third bridge arm module through the low-voltage side capacitor CL and the body diode D3 of the fifth switching transistor S3 in the third bridge arm module to release energy. During this process, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both flow in the "negative" direction, and the current gradually decreases to charge the first power supply, and the first bridge arm Both the first inductance L1 in the module and the third inductance L3 in the third bridge arm module release energy, the current of the second inductance L2 in the second bridge arm module is in the "negative" flow direction, but the current gradually increases, the second The second inductor L2 in the bridge arm module stores energy, and the second capacitor CH2 on the high voltage side charges the second inductor L2 in the second bridge arm module and the first power supply until the next sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第二电源的正端通过高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3流回第二电源的负端。该过程中，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3均储能，电流均为“正”流向，且电流逐渐增大，直到下一时序。The first capacitor CH1 on the high voltage side, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and the current flows back from the positive terminal of the second power supply through the first capacitor CH1 on the high voltage side, the second capacitor CH2 on the high voltage side and the third capacitor CH3 on the high voltage side The negative terminal of the second power supply. During this process, the first capacitor CH1 at the high voltage side, the second capacitor CH2 at the high voltage side, and the third capacitor CH3 at the high voltage side all store energy, and the currents all flow in a "positive" direction, and the current gradually increases until the next sequence.
T5’时序：第一桥臂模块中第一开关管、第二桥臂模块中第三开关管和第三桥臂模块中第六、第七开关管均导通，其余开关管均关断。如图10所示，此时，电流流向为，第一桥臂模块中第一电感L1通过低压侧电容CL、第一桥臂模块中的第一开关管S1的体二极管D1回至第一桥臂模块中第一电感L1进行释能；第二桥臂模块中第二电感L2通过低压侧电容CL、第二桥臂模块中的第三开关管S2的体二极管D2回至第二桥臂模块中第二电感L2进行释能；高压侧第三电容CH3的第一端通过第三桥臂模块中的第六开关管中的S7’、第三桥臂模块中的第三电感L3、低压侧电容CL、第三桥臂模块中的第七开关管S5回至高压侧第三电容CH3的第二端；该过程中，第一桥臂模块中的第一电感L1和第二桥臂模块中的第二电感L2均为“负”流向，且电流逐渐减小，向第一电源充电，第一桥臂模块中的第一电感L1和第二桥臂模块中的第二电感L2均释能，第三桥臂模块中的第三电感L3的电流为“负”流向，但电流逐渐增大，第三桥臂模块中的第三电感L3储能，高压侧第三电容CH3向第三桥臂模块中第三电感L3和第一电源充电，直到下一时序。T5' sequence: the first switch tube in the first bridge arm module, the third switch tube in the second bridge arm module, and the sixth and seventh switch tubes in the third bridge arm module are all turned on, and the rest of the switch tubes are all turned off. As shown in Figure 10, at this time, the current flow direction is that the first inductor L1 in the first bridge arm module returns to the first bridge through the low-voltage side capacitor CL and the body diode D1 of the first switching transistor S1 in the first bridge arm module. The first inductor L1 in the arm module releases energy; the second inductor L2 in the second bridge arm module returns to the second bridge arm module through the low-voltage side capacitor CL and the body diode D2 of the third switching transistor S2 in the second bridge arm module The second inductance L2 in the high-voltage side releases energy; the first end of the third capacitor CH3 on the high-voltage side passes through S7' in the sixth switch tube in the third bridge arm module, the third inductance L3 in the third bridge arm module, and the low-voltage side The capacitor CL and the seventh switching tube S5 in the third bridge arm module return to the second end of the third capacitor CH3 on the high voltage side; during this process, the first inductor L1 in the first bridge arm module and the second end of the second bridge arm module The second inductance L2 of the current is in the "negative" flow direction, and the current gradually decreases to charge the first power supply, and the first inductance L1 in the first bridge arm module and the second inductance L2 in the second bridge arm module both release energy , the current of the third inductor L3 in the third bridge arm module is in the "negative" flow direction, but the current gradually increases, the third inductor L3 in the third bridge arm module stores energy, and the third capacitor CH3 on the high voltage side flows to the third bridge The third inductor L3 in the arm module is charged with the first power supply until the next sequence.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第二电源的正端通过高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3流回第二电源的负端。该过程中，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3均储能，电流均为“正”流向，且电流逐渐增大，直到下一时序。The first capacitor CH1 on the high voltage side, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and the current flows back from the positive terminal of the second power supply through the first capacitor CH1 on the high voltage side, the second capacitor CH2 on the high voltage side and the third capacitor CH3 on the high voltage side The negative terminal of the second power supply. During this process, the first capacitor CH1 at the high voltage side, the second capacitor CH2 at the high voltage side, and the third capacitor CH3 at the high voltage side all store energy, and the currents all flow in a "positive" direction, and the current gradually increases until the next sequence.
T2’、T4’和T6’时序：第一桥臂模块中第一开关管、第二桥臂模块中第三开关管和第三桥臂模块中第五开关管均导通，其余开关管均关断。如图11所示，此时，电流流向为，第一桥臂模块中第一电感L1通过低压侧电容CL、第一桥臂模块中的第一开关管S1的体二极管D1回至第一桥臂模块中第一电感L1进行释能；第二桥臂模块中第二电感L2通过低压侧电容CL、第二桥臂模块中的第三开关管S2的体二极管D2回至第二桥臂模块中第二电感L2进行释能；第三桥臂模块中第三电感L3通过低压侧电容CL、第三桥臂模块中的第五开关管S3的体二极管D3回至第三桥臂模块中第三电感L3进行释能。该过程中，第一桥臂模块中的第一电感L1、第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均为“负”流向，且电流逐渐减小，向第一电源充电，第一桥臂模块中的第一电感L1、第二桥臂模块中的第二电感L2和第三桥臂模块中的第三电感L3均释能，直到下一时序。Timing sequence of T2', T4' and T6': the first switch tube in the first bridge arm module, the third switch tube in the second bridge arm module, and the fifth switch tube in the third bridge arm module are all turned on, and the other switch tubes are all turned on. off. As shown in Figure 11, at this time, the current flow direction is that the first inductor L1 in the first bridge arm module returns to the first bridge through the low-voltage side capacitor CL and the body diode D1 of the first switching transistor S1 in the first bridge arm module. The first inductor L1 in the arm module releases energy; the second inductor L2 in the second bridge arm module returns to the second bridge arm module through the low-voltage side capacitor CL and the body diode D2 of the third switching transistor S2 in the second bridge arm module The second inductance L2 in the third bridge arm module releases energy; the third inductance L3 in the third bridge arm module returns to the first The three inductors L3 release energy. During this process, the first inductor L1 in the first bridge arm module, the second inductor L2 in the second bridge arm module, and the third inductor L3 in the third bridge arm module are all in the "negative" flow direction, and the current gradually decreases. Small, charge the first power supply, the first inductor L1 in the first bridge arm module, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module all release energy until the next timing.
高压侧第一电容CH1、第二电容CH2和第三电容CH3首尾相连，电流由第二电源的正端通过高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3流回第二电源的负端。该过程中，高压侧第一电容CH1、高压侧第二电容CH2和高压侧第三电容CH3均储能，电流均为“正”流向，且电流逐渐增大，直到下一时序。The first capacitor CH1 on the high voltage side, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and the current flows back from the positive terminal of the second power supply through the first capacitor CH1 on the high voltage side, the second capacitor CH2 on the high voltage side and the third capacitor CH3 on the high voltage side The negative terminal of the second power supply. During this process, the first capacitor CH1 at the high voltage side, the second capacitor CH2 at the high voltage side, and the third capacitor CH3 at the high voltage side all store energy, and the currents all flow in a "positive" direction, and the current gradually increases until the next sequence.
以上显示和描述了本发明的基本原理和主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下，本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
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