CN108988634B - Three-phase interleaved bidirectional large-transformation-ratio DCDC converter and control method thereof - Google Patents

Three-phase interleaved bidirectional large-transformation-ratio DCDC converter and control method thereof Download PDF

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Publication number
CN108988634B
CN108988634B CN201811008710.3A CN201811008710A CN108988634B CN 108988634 B CN108988634 B CN 108988634B CN 201811008710 A CN201811008710 A CN 201811008710A CN 108988634 B CN108988634 B CN 108988634B
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China
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switching tube
voltage
tube
bridge arm
capacitor
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CN108988634A (en
Inventor
张丽
李先允
周喜章
戴宁
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Nanjing Kangni Huanwang Switch Equipment Co ltd
Nanjing Institute of Technology
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Nanjing Kangni Huanwang Switch Equipment Co ltd
Nanjing Institute of Technology
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Classifications

    • 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
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • 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
    • H02M1/14Arrangements for reducing ripples from dc input or output
    • 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
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1582Buck-boost converters
    • 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
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1584Conversion 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
    • 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
    • H02M1/0067Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/0077Plural converter units whose outputs are connected in series
    • 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
    • H02M3/02Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10Conversion 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
    • H02M3/145Conversion 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
    • H02M3/155Conversion 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
    • H02M3/156Conversion 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
    • H02M3/158Conversion 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
    • H02M3/1584Conversion 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
    • H02M3/1586Conversion 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

Abstract

The invention discloses a three-phase staggered bidirectional high-transformation-ratio DCDC converter and a control method thereof, wherein the three-phase staggered bidirectional high-transformation-ratio DCDC converter comprises a low-voltage side, a bridge arm unit and a high-voltage side which are sequentially connected, wherein the low-voltage side is connected with a first power supply; the high-voltage side is connected with a second power supply; and controlling different time sequences of the three-phase interleaved bidirectional high-transformation-ratio DCDC converter according to the difference value between the voltage value of the second power supply and the reference value and the voltage relation between the first power supply and the second power supply, so as to realize two working modes of Boost and Buck. When the three-phase interleaved bidirectional high-transformation-ratio DCDC converter works in the Boost direction, the input ends are interleaved and connected in parallel to reduce input current ripples, and the output ends are interleaved and connected in series to improve the Boost transformation ratio; when the three-phase interleaved bidirectional high-transformation-ratio DCDC converter works in the Buck direction, the input ends are connected in series in an interleaved mode, the output ends are connected in parallel in an interleaved mode, the high step-down ratio is achieved, and output current ripples are reduced.

Description

Three-phase interleaved bidirectional large-transformation-ratio DCDC converter and control method thereof
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a three-phase interleaved bidirectional high-transformation-ratio DCDC converter and a control method thereof.
Background
A DC-DC converter, DC-DC converter for short, is a power electronic device that converts one kind of DC power supply into another DC power supply having different output characteristics. The constant direct-current voltage is chopped into a series of pulse voltages through the rapid on-off control of the power electronic device, the pulse width of the series of pulses is changed through controlling the change of the duty ratio, the average value of the output voltage is adjusted, and the target direct-current voltage is obtained. The solar energy power generation device is widely applied to the fields of solar power generation, uninterruptible power supplies and the like.
The traditional bidirectional direct current converter can realize bidirectional energy conversion, is equivalent to a basic Boost converter and a basic Buck converter in function, has the advantages of simple structure, low cost and no transformation loss, but has the defects of large input current and output current ripple, small capacity, large filter element and the like.
At present, the application of the DCDC converter is more and more extensive, and the existing three-phase interleaved parallel bidirectional DCDC converter interleaves and connects three inductive currents in parallel, so that the input current ripple is reduced, the efficiency of the converter is improved, and the dynamic response of the converter is optimized. However, the three-phase interleaved parallel bidirectional dc converter does not improve the conversion ratio, and is difficult to be applied to a case where the conversion ratio of the input voltage to the output voltage is large.
Disclosure of Invention
In order to solve the problems, the invention provides a three-phase interleaved bidirectional high-transformation-ratio DCDC converter and a control method thereof, which are used for reducing current ripples, improving transformation ratio and realizing direct current conversion.
The technical purpose is achieved, the technical effect is achieved, and the invention is realized through the following technical scheme:
in a first aspect, the invention provides a three-phase staggered bidirectional high-transformation-ratio DCDC converter, which comprises a low-voltage side, a bridge arm unit and a high-voltage side which are sequentially connected, wherein the bridge arm unit comprises a first bridge arm module, a second bridge arm module and a third bridge arm module which are sequentially connected in parallel;
the first bridge arm module comprises a first inductor, a first switching tube and a second switching tube;
the second bridge arm module comprises a second inductor, a third switching tube and a fourth switching tube;
the third bridge arm module comprises a third inductor, a fifth switching tube, a sixth switching tube and a seventh switching tube;
wherein the first ends of the first inductor, the second inductor and the third inductor are all connected to the positive end of the low-voltage side; second ends of the first inductor, the second inductor and the third inductor are respectively connected with first ends of a first switching tube, a third switching tube and a fifth switching tube; the second ends of the first switching tube, the third switching tube, the fifth switching tube and the first end of the seventh switching tube are connected to the negative end of the low-voltage side; the positive end and the negative end of the low-voltage side are respectively used for being connected with the positive electrode and the negative electrode of the first power supply;
the second ends of the first inductor, the second inductor and the third inductor are respectively connected with the second ends of the second switching tube, the fourth switching tube and the sixth switching tube; the first end of the second switch tube, the first end of the fourth switch tube, the first end of the sixth switch tube and the second end of the seventh switch tube are sequentially connected to the high-voltage side respectively, wherein the first end of the second switch tube is connected with the positive end of the high-voltage side; the second end of the seventh switching tube is connected with the negative end of the high-voltage side; and the positive end and the negative end of the high-voltage side are respectively used for being connected with the positive pole and the negative pole of the second power supply.
Preferably, the low side comprises a low side capacitance; the first ends of the first inductor, the second inductor and the third inductor are connected to the positive end of the low-voltage side capacitor; and the second ends of the first switching tube, the third switching tube, the fifth switching tube and the first end of the seventh switching tube are connected to the negative end of the low-voltage side capacitor.
Preferably, the high-voltage side comprises a first high-voltage side capacitor, a second high-voltage side capacitor and a third high-voltage side capacitor which are sequentially arranged, and the first high-voltage side capacitor is arranged between the second switch tube and the fourth switch tube; the high-voltage side second capacitor is arranged between the fourth switching tube and the sixth switching tube; and the high-voltage side third capacitor is arranged between the sixth switching tube and the seventh switching tube.
Preferably, the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are all composed of parallel-connected body diodes of transistors, and the fourth switching tube and the sixth switching tube are all composed of two transistors connected in parallel in an opposite direction.
Preferably, the first end and the second end of the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are respectively a collector and an emitter.
Preferably, the driving signals of the first switching tube and the second switching tube are in opposite phase; the driving signals of the third switching tube and the fourth switching tube are in opposite phases; and the driving signals of the fifth switching tube and the sixth switching tube are in opposite phases.
Preferably, the driving signals of the first switch tube, the third switch tube and the fifth switch tube are separated by 120 °.
In a second aspect, the present invention provides a method for controlling a three-phase interleaved bidirectional large-transformation-ratio DCDC converter, including:
acquiring the control requirement of a second power supply for charging and discharging the first power supply;
sampling the current voltage of a first power supply and the current voltage of a second power supply;
when the voltage of the second power supply is lower than the reference value, sequentially controlling the three-phase interleaved bidirectional high-transformation-ratio DCDC converter in the first aspect by adopting a time sequence from T1 to T6 in a control period to enable the three-phase interleaved bidirectional high-transformation-ratio DCDC converter to work in a Boost mode, wherein the first power supply is in a discharge mode;
when the second power supply voltage is higher than the reference value, the three-phase interleaved bidirectional large-transformation-ratio DCDC converter in the first aspect is sequentially controlled by using the time sequence from T1 'to T6' in a control period to work in a Buck mode, and the first power supply is in a charging mode.
Preferably, the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are all composed of parallel transistors, and the fourth switching tube and the sixth switching tube are all composed of two reverse parallel transistors;
when the switching tube is controlled by T1, T3 and T5 time sequences, the first switching tube, the third switching tube and the fifth switching tube are all conducted, and the other switching tubes are all turned off;
when the switching tube is controlled by a T2 time sequence, the first switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all switched on, and the other switching tubes are all switched off;
when the timing sequence is controlled by T4, the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all switched on, and the other switch tubes are all switched off;
when the voltage is controlled by the T6 time sequence, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are all switched on, and the other switch tubes are all switched off.
Preferably, under control of the T1' timing sequence: the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube are all switched on, and the other switching tubes are all switched off;
when the switching tube is controlled by a T3' time sequence, the first switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all switched on, and the other switching tubes are all switched off;
when the timing sequence is controlled by T5', the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all switched on, and the other switch tubes are all switched off;
when the timing sequence is controlled by T2 ', T4 ' and T6 ', the first switch tube, the third switch tube and the fifth switch tube are all turned on, and the rest switch tubes are all turned off.
The three-phase interleaved DCDC converter and the control method thereof provided by the invention can perform bidirectional conversion according to the difference value between the voltage value of the second power supply and the reference value, so as to realize buck-boost conversion, and compared with the prior art, the three-phase interleaved DCDC converter has the following beneficial effects:
(1) when the three-phase interleaved DCDC converter works in the Boost direction, the input ends are interleaved and connected in parallel to reduce input current ripples, and the output ends are interleaved and connected in series to improve the Boost transformation ratio; when the three-phase interleaved DCDC converter works in the Buck direction, the input ends are connected in series in an interleaved mode, the output ends are connected in parallel in an interleaved mode, the voltage reduction transformation ratio is large, and output current ripples are reduced.
(2) Under two working modes, the maximum voltage stress borne by 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 borne by the seventh switch tube S5 and the fourth switch tube S6 (S6') is 2/3 of the high-voltage side voltage, the maximum voltage stress borne by the second switch tube S4 is equal to the high-voltage side voltage, and the voltage stress of the power device is reduced, so that an energy storage element with smaller capacity can be selected, the power device is more suitable for high-power occasions, and the service life of a storage battery is prolonged.
(3) The conversion of two states of energy storage and energy release of the inductor and the conversion of the current in each switching tube in the IGBT and the body diode lead the power loops to be inconsistent, thus being beneficial to the dispersed heat dissipation of the power tubes, reducing the heat dissipation requirement and improving the reliability of the system application.
(4) Energy can flow in two directions, and the system is controlled stably; and the symmetrical control is driven, and the control scheme is simple.
Drawings
FIG. 1 is a topology diagram of a three-phase interleaved bidirectional high-ratio DCDC converter according to an embodiment of the present invention;
fig. 2 is a timing diagram of a Boost circuit when the second power voltage is lower than the reference value according to an embodiment of the invention;
FIG. 3 is a timing diagram of the Buck circuit when the second power voltage is higher than the reference value according to an embodiment of the present invention;
FIG. 4 is a timing current flow diagram of T1, T3 and T5 in FIG. 2;
FIG. 5 is a timing current flow diagram of T2 in FIG. 2;
FIG. 6 is a timing current flow diagram of T4 in FIG. 2;
FIG. 7 is a timing current flow diagram of T6 in FIG. 2;
FIG. 8 is a timing current flow diagram of T1' in FIG. 3;
FIG. 9 is a timing current flow diagram of T3' in FIG. 3;
FIG. 10 is a timing current flow diagram of T5' in FIG. 3;
FIG. 11 shows the timing current flows of T2 ', T4 ' and T6 ' in FIG. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
Example 1
The embodiment of the invention provides a three-phase interleaved bidirectional high-transformation-ratio DCDC converter, and fig. 1 is a topological diagram of the three-phase interleaved bidirectional high-transformation-ratio DCDC converter provided by the embodiment of the invention. As shown in fig. 1, the three-phase interleaved bidirectional high-conversion-ratio DCDC converter includes: the bridge arm circuit comprises a low-voltage side capacitor CL, bridge arm units (a first bridge arm module, a second bridge arm module and a third bridge arm module respectively) and high-voltage side capacitors (respectively marked as a high-voltage side first capacitor CH1, a high-voltage side second capacitor CH2 and a high-voltage side third capacitor CH3) connected with the first bridge arm module, the second bridge arm module and the third bridge arm module. The parameters of the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 are the same.
The first bridge arm module comprises a first inductor L1, a first switch tube S1 and a second switch tube S4; the second bridge arm module comprises a second inductor L2, a third switching tube S2 and a fourth switching tube (composed of S6 and S6 'which are reversely connected in parallel), and the third bridge arm module comprises a third inductor L3, a fifth switching tube S3, a sixth switching tube (composed of S7 and S7' which are reversely connected in parallel) and a seventh switching tube S5; and inductance parameters of each bridge arm module are the same.
In a specific implementation manner of the embodiment of the present invention, the specific connection relationship is as follows:
1) the specific connection relationship of the first bridge arm module is as follows: the collector of the first switch tube S1 in the first bridge arm module is connected to the emitter of the second switch tube S4 of the first bridge arm and connected to the second end of the first inductor L1 of the first bridge arm, and the collector of the second switch tube S4 is connected to the first end of the high-voltage-side first capacitor CH 1. The high-side first capacitor CH1 is polarized, the first terminal of the high-side first capacitor CH1 is positive, and the second terminal of the high-side first capacitor CH1 is negative.
2) The specific connection relationship of the second bridge arm module is as follows: the collector of the third switching tube S2 of the second bridge arm module is connected with the collector of the S6 in the fourth switching tube (composed of S6 and S6' which are connected in reverse parallel) of the second bridge arm module, and is connected with the second end of the second inductor L2 of the second bridge arm module, and the emitter of the S6 in the fourth switching tube is connected with the first end of the high-voltage side second capacitor CH 2. The high-side second capacitor CH2 is polarized, the first terminal of the high-side second capacitor CH2 is positive, and the second terminal of the high-side second capacitor CH2 is negative.
3) The specific connection relationship of the third bridge arm module is as follows: the collector of the fifth switching tube S3 of the third arm module is connected to the collector of the S7 in the sixth switching tube (composed of S7 and S7' connected in reverse parallel) of the third arm module, and is connected to the second end of the third inductor L3 of the third arm, and the emitter of the S7 in the sixth switching tube is connected to the first end of the high-voltage side third capacitor CH 3. The high-side third capacitor CH3 has polarity, the first terminal of the high-side third capacitor CH3 is positive, and the second terminal of the high-side third capacitor CH3 is negative.
The second end of the high-voltage side first capacitor CH1 corresponding to the first bridge arm module is connected with the first end of the high-voltage side second capacitor CH2 corresponding to the second bridge arm module, the second end of the high-voltage side second capacitor CH2 corresponding to the second bridge arm module is connected with the first end of the high-voltage side third capacitor CH3 corresponding to the third bridge arm module, and the second end of the high-voltage side third capacitor CH3 corresponding to the third bridge arm module is connected with the emitter of the seventh switch tube S5 in the third bridge arm module.
An emitter of a first switching tube S1 in the first bridge arm module and an emitter of a third switching tube S2 in the second bridge arm module are connected with an emitter of a fifth switching tube S3 in the third bridge arm module to serve as negative terminals of a first power supply, and a first end of a first inductor L1 in the first bridge arm module and a first end of a second inductor L2 in the second bridge arm module are connected with a first end of a third inductor L3 in the third bridge arm module to serve as positive terminals of the first power supply.
The first end of the high-voltage side first capacitor CH1 corresponding to the first bridge arm module is used as the positive terminal of the second power supply, and the second end of the high-voltage side third capacitor CH3 corresponding to the third bridge arm module is used as the negative terminal of the second power supply.
It should be noted that, in the topology structure in fig. 1, the first power source is a storage battery pack, and the second power source is a dc bus, but in a specific implementation, the first power source and the second power source may be selected in a specific situation, and are not limited to the scenario shown in fig. 1.
Example 2
Based on the three-phase interleaved bidirectional large-transformation-ratio DCDC converter in embodiment 1, the following two transformations can be realized:
1. when the voltage of the second power supply is lower than the reference value, a Boost circuit is constructed to realize the discharge of the first power supply;
2. when the second power supply voltage is higher than the reference value, a Buck circuit is constructed to charge the first power supply;
in order to make the control method of the three-phase interleaved bidirectional high-transformation-ratio DCDC converter more clear to those skilled in the art, the control method is further described below with reference to the control timing sequence and the accompanying drawings of the switching tube.
1. When the voltage of the second power supply is lower than a reference value, a Boost circuit is constructed to realize discharge control of the first power supply, and the control method specifically comprises the following steps:
when the discharge of the first power supply needs to be controlled and the second power supply voltage is lower than the reference value, the three-phase interleaved bidirectional large-transformation-ratio DCDC converter is sequentially controlled by using the timings of T1, T2, T3, T4, T5 and T6 shown in fig. 2 in one switching period, specifically as follows:
t1, T3, T5 timing: and a first switching tube in the first bridge arm module, a third switching tube in the second bridge arm module and a fifth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 4, at this time, the current flows in a direction from the first end of the low-voltage side capacitor CL (i.e., the positive end of the first power supply) to the second end of the low-voltage side capacitor CL (i.e., the negative end of the first power supply) through the first inductor L1 in the first bridge arm module and the first switching tube S1 in the first bridge arm module; a first end of the low-voltage side capacitor CL reaches a second end of the low-voltage side capacitor CL through a second inductor L2 in the second bridge arm module and a third switching tube S2 in the second bridge arm module; a first end of the low-voltage side capacitor CL passes through the third inductor L3 in the third bridge arm module and the fifth switching tube S3 in the third bridge arm module to a second end of the low-voltage side capacitor CL. It is defined that the current direction of the first inductor L1 in the first bridge leg module flows from left to right as current "positive", the current direction of the second inductor L2 in the second bridge leg module flows from left to right as current "positive", and the current direction of the third inductor L3 in the third bridge leg module flows from left to right as current "positive", and this definition is used hereinafter. In the 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 are all in a "positive" flow direction, and the currents gradually increase, and 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.
The high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 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 from the negative end of the second power supply to the negative end of the third capacitor CH3, so that the current direction of the high-voltage side first capacitor CH1 is from top to bottom as the current "positive" flow, the current direction of the high-voltage side second capacitor CH2 is from top to bottom as the current "positive" flow, and the current direction of the high-voltage side third capacitor CH3 is from top to bottom as the current "positive" flow, which is defined hereinafter. In the process, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 release energy, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 all flow in a negative mode, the current is gradually reduced, and the second power supply is charged until the next time sequence.
T2 timing: and a first switching tube in the first bridge arm module, a fourth switching tube in the second bridge arm module, a fifth switching tube and a sixth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 5, at this time, the current flows in a direction from the first end of the low-voltage side capacitor CL to the second end of the low-voltage side capacitor CL through the first inductor L1 in the first bridge arm module and the first switching tube S1 in the first bridge arm module; a first end of the low-voltage side capacitor CL reaches a second end of the low-voltage side capacitor CL through a second inductor L2 in the second bridge arm module, S6 in a fourth switching tube in the second bridge arm module, a high-voltage side second capacitor CH2, S7' in a sixth switching tube in the third bridge arm module, and a fifth switching tube S3 in the third bridge arm module; a first end of the low-voltage side capacitor CL passes through the third inductor L3 in the third bridge arm module and the fifth switching tube S3 in the third bridge arm module to a second end of the low-voltage side capacitor CL. In the process, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both have a positive flow direction, and the current gradually increases, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both store energy, the current of the second inductor L2 in the second bridge arm module is in the positive flow direction, but the current gradually decreases, the second inductor L2 in the second bridge arm module releases energy, and the high-voltage side second capacitor CH2 is charged until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the first end of the first capacitor CH1 to the positive end of the second power supply and from the negative end of the second power supply back to the negative end of the third capacitor CH 3. In the process, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 release energy, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 all flow in a negative mode, the current is gradually reduced, and the second power supply is charged until the next time sequence.
T4 timing: and a first switching tube in the first bridge arm module, a third switching tube in the second bridge arm module, a sixth switching tube and a seventh switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 6, at this time, the current flows in a direction from the first end of the low-voltage side capacitor CL to the second end of the low-voltage side capacitor CL through the first inductor L1 in the first bridge arm module and the first switching tube S1 in the first bridge arm module; a first end of the low-voltage side capacitor CL reaches a second end of the low-voltage side capacitor CL through a second inductor L2 in the second bridge arm module and a third switching tube S2 in the second bridge arm module; a first end of the low-voltage side capacitor CL is connected to a second end of the low-voltage side capacitor CL through a third inductor L3 in the third bridge arm module, S7 in the sixth switching tube in the third bridge arm module, a high-voltage side third capacitor CH3, and a body diode D5 of the seventh switching tube S5 in the third bridge arm module. In the process, the first inductor L1 in the first bridge arm module and the second inductor L2 in the second bridge arm module both have a positive flow direction, and the current gradually increases, the first inductor L1 in the first bridge arm module and the second inductor L2 in the second bridge arm module both store energy, the current of the third inductor L3 in the third bridge arm module has a positive flow direction, but the current gradually decreases, and the third inductor L3 in the third bridge arm module releases energy to charge the high-voltage side third capacitor CH3 until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the first end of the first capacitor CH1 to the positive end of the second power supply and from the negative end of the second power supply back to the negative end of the third capacitor CH 3. In the process, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 release energy, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 all flow in a negative mode, the current is gradually reduced, and the second power supply is charged until the next time sequence.
T6 timing: and the second switching tube in the first bridge arm module, the third switching tube and the fourth switching tube in the second bridge arm module and the fifth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 7, at this time, the current flows in a direction from the first end of the low-voltage side capacitor CL to the second end of the low-voltage side capacitor CL through the first inductor L1 in the first bridge arm module, the body diode D4 of the second switching tube S4 in the first bridge arm module, the high-voltage side first capacitor CH1, the S6' in the fourth switching tube in the second bridge arm module, and the third switching tube S2 in the second bridge arm module; a first end of the low-voltage side capacitor CL reaches a second end of the low-voltage side capacitor CL through a second inductor L2 in the second bridge arm module and a third switching tube S2 in the second bridge arm module; a first end of the low-voltage side capacitor CL passes through the third inductor L3 in the third bridge arm module and the fifth switching tube S3 in the third bridge arm module to a second end of the low-voltage side capacitor CL. In the process, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module both have a positive flow direction, and the current gradually increases, both the second inductor L2 in the second bridge arm module 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 has a positive flow direction, but the current gradually decreases, and the first inductor L1 in the first bridge arm module releases energy to charge the high-voltage-side first capacitor CH1 until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the first end of the first capacitor CH1 to the positive end of the second power supply and from the negative end of the second power supply back to the negative end of the third capacitor CH 3. In the process, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 release energy, the first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 all flow in a negative mode, the current is gradually reduced, and the second power supply is charged until the next time sequence.
2. When the second power supply voltage is higher than the reference value, a Buck circuit is constructed to realize the charging control of the first power supply, and the method comprises the following steps:
timing of T1': and a second switching tube in the first bridge arm module, a third switching tube and a fourth switching tube in the second bridge arm module and a fifth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 8, at this time, the current flow direction is that the first end of the high-side first capacitor CH1 returns to the second end of the high-side first capacitor CH1 through the second switch tube S4 in the first bridge arm module, the first inductor L1 in the first bridge arm module, the low-side capacitor CL, the body diode D2 of the third switch tube S2 in the second bridge arm module, and the S6 in the fourth switch tube in the second bridge arm module; a second inductor L2 in the second bridge arm module returns to a second inductor L2 in the second bridge arm module through a low-voltage side capacitor CL and a body diode D2 of a third switching tube S2 in the second bridge arm module to release energy; the third inductor L3 in the third bridge arm module is discharged back to the third inductor L3 in the third bridge arm module through the low-voltage side capacitor CL, the body diode D3 of the fifth switching tube S3 in the third bridge arm module. In the process, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module both have a negative flow direction, and the currents gradually decrease and charge the first power supply, the second inductor L2 in the second bridge arm module and the third inductor L3 in the third bridge arm module both release energy, the current of the first inductor L1 in the first bridge arm module is in the negative flow direction, but the current gradually increases, the first inductor L1 in the first bridge arm module stores energy, and the first capacitor CH1 on the high-voltage side charges the first inductor L1 in the first bridge arm module and the first power supply until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the positive terminal of the second power supply to the negative terminal of the second power supply through the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH 3. In the process, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 store energy, the current flows in a positive direction, and the current gradually increases until the next time sequence.
Timing of T3': and a first switching tube in the first bridge arm module, a fourth switching tube in the second bridge arm module and a fifth switching tube and a sixth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 9, at this time, the current flows in the direction of yes, the first inductor L1 in the first bridge arm module returns to the first inductor L1 in the first bridge arm module through the low-voltage side capacitor CL and the body diode D1 of the first switching tube S1 in the first bridge arm module to release energy; a first end of the high-voltage side second capacitor CH2 returns to a second end of the high-voltage side second capacitor CH2 through the 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 the S7 in the sixth switch tube in the third bridge arm module; the third inductor L3 in the third bridge arm module is discharged back to the third inductor L3 in the third bridge arm module through the low-voltage side capacitor CL, the body diode D3 of the fifth switching tube S3 in the third bridge arm module. In the process, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both have a negative flow direction, and the currents gradually decrease and charge the first power supply, the first inductor L1 in the first bridge arm module and the third inductor L3 in the third bridge arm module both release energy, the current of the second inductor L2 in the second bridge arm module is in the negative flow direction, but the current gradually increases, the second inductor L2 in the second bridge arm module stores energy, and the high-voltage side second capacitor CH2 charges the second inductor L2 in the second bridge arm module and the first power supply until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the positive terminal of the second power supply to the negative terminal of the second power supply through the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH 3. In the process, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 store energy, the current flows in a positive direction, and the current gradually increases until the next time sequence.
Timing of T5': and a first switching tube in the first bridge arm module, a third switching tube in the second bridge arm module and sixth and seventh switching tubes in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 10, at this time, the current flows in the direction of yes, the first inductor L1 in the first bridge arm module returns to the first inductor L1 in the first bridge arm module through the low-voltage side capacitor CL and the body diode D1 of the first switching tube S1 in the first bridge arm module to release energy; a second inductor L2 in the second bridge arm module returns to a second inductor L2 in the second bridge arm module through a low-voltage side capacitor CL and a body diode D2 of a third switching tube S2 in the second bridge arm module to release energy; a first end of the high-voltage side third capacitor CH3 returns to a second end of the high-voltage side third capacitor CH3 through the S7' in the sixth switching tube of the third bridge arm module, the third inductor L3 in the third bridge arm module, the low-voltage side capacitor CL, and the seventh switching tube S5 in the third bridge arm module; in the process, the first inductor L1 in the first bridge arm module and the second inductor L2 in the second bridge arm module both have a negative flow direction, and the currents gradually decrease and charge the first power supply, the first inductor L1 in the first bridge arm module and the second inductor L2 in the second bridge arm module 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 high-voltage side third capacitor CH3 charges the third inductor L3 in the third bridge arm module and the first power supply until the next time sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the positive terminal of the second power supply to the negative terminal of the second power supply through the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH 3. In the process, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 store energy, the current flows in a positive direction, and the current gradually increases until the next time sequence.
T2 ', T4 ', and T6 ' timing: and a first switching tube in the first bridge arm module, a third switching tube in the second bridge arm module and a fifth switching tube in the third bridge arm module are all switched on, and the other switching tubes are all switched off. As shown in fig. 11, at this time, the current flows in the direction of yes, the first inductor L1 in the first bridge arm module returns to the first inductor L1 in the first bridge arm module through the low-voltage side capacitor CL and the body diode D1 of the first switching tube S1 in the first bridge arm module to release energy; a second inductor L2 in the second bridge arm module returns to a second inductor L2 in the second bridge arm module through a low-voltage side capacitor CL and a body diode D2 of a third switching tube S2 in the second bridge arm module to release energy; the third inductor L3 in the third bridge arm module is discharged back to the third inductor L3 in the third bridge arm module through the low-voltage side capacitor CL, the body diode D3 of the fifth switching tube S3 in the third bridge arm module. In the 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 all flow in a negative direction, the current is gradually reduced, the first power supply is charged, and 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 sequence.
The high-voltage side first capacitor CH1, the second capacitor CH2 and the third capacitor CH3 are connected end to end, and current flows from the positive terminal of the second power supply to the negative terminal of the second power supply through the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH 3. In the process, the high-voltage side first capacitor CH1, the high-voltage side second capacitor CH2 and the high-voltage side third capacitor CH3 store energy, the current flows in a positive direction, and the current gradually increases until the next time sequence.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The utility model provides a two-way big transformation ratio DCDC converter of three-phase alternating-type, includes low pressure side, bridge arm unit and the high-pressure side that links to each other in order, its characterized in that: the bridge arm unit comprises a first bridge arm module, a second bridge arm module and a third bridge arm module which are sequentially connected in parallel;
the first bridge arm module comprises a first inductor, a first switching tube and a second switching tube;
the second bridge arm module comprises a second inductor, a third switching tube and a fourth switching tube;
the third bridge arm module comprises a third inductor, a fifth switching tube, a sixth switching tube and a seventh switching tube;
wherein the first ends of the first inductor, the second inductor and the third inductor are all connected to the positive end of the low-voltage side; second ends of the first inductor, the second inductor and the third inductor are respectively connected with first ends of a first switching tube, a third switching tube and a fifth switching tube; the second ends of the first switching tube, the third switching tube, the fifth switching tube and the first end of the seventh switching tube are connected to the negative end of the low-voltage side; the positive end and the negative end of the low-voltage side are respectively used for being connected with the positive electrode and the negative electrode of the first power supply;
the second ends of the first inductor, the second inductor and the third inductor are respectively connected with the second ends of the second switching tube, the fourth switching tube and the sixth switching tube; the first end of the second switch tube, the first end of the fourth switch tube, the first end of the sixth switch tube and the second end of the seventh switch tube are sequentially connected to the high-voltage side respectively, wherein the first end of the second switch tube is connected with the positive end of the high-voltage side; the second end of the seventh switching tube is connected with the negative end of the high-voltage side; the positive end and the negative end of the high-voltage side are respectively used for being connected with the positive electrode and the negative electrode of a second power supply;
the high-voltage side comprises a first high-voltage side capacitor, a second high-voltage side capacitor and a third high-voltage side capacitor which are sequentially arranged, and the first high-voltage side capacitor is arranged between the second switch tube and the fourth switch tube; the high-voltage side second capacitor is arranged between the fourth switching tube and the sixth switching tube; and the high-voltage side third capacitor is arranged between the sixth switching tube and the seventh switching tube.
2. The three-phase interleaved bidirectional high-conversion-ratio DCDC converter according to claim 1, wherein: the low side includes a low side capacitance; the first ends of the first inductor, the second inductor and the third inductor are connected to the positive end of the low-voltage side capacitor; and the second ends of the first switching tube, the third switching tube, the fifth switching tube and the first end of the seventh switching tube are connected to the negative end of the low-voltage side capacitor.
3. The three-phase interleaved bidirectional high-conversion-ratio DCDC converter according to claim 1, wherein: the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are all composed of parallel transistors, and the fourth switching tube and the sixth switching tube are all composed of two reverse parallel transistors.
4. The three-phase interleaved bidirectional high-conversion-ratio DCDC converter according to claim 3, wherein: and the first end and the second end of the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are respectively a collector and an emitter.
5. The three-phase interleaved bidirectional high-conversion-ratio DCDC converter according to claim 1, wherein: the driving signals of the first switching tube and the second switching tube are in opposite phases; the driving signals of the third switching tube and the fourth switching tube are in opposite phases; and the driving signals of the fifth switching tube and the sixth switching tube are in opposite phases.
6. The three-phase interleaved bidirectional high-conversion-ratio DCDC converter according to claim 1, wherein: the driving signals of the first switching tube, the third switching tube and the fifth switching tube are separated by 120 degrees.
7. A control method of a three-phase interleaved bidirectional large-transformation-ratio DCDC converter is characterized by comprising the following steps:
acquiring the control requirement of a second power supply for charging and discharging the first power supply;
sampling the current voltage of a first power supply and the current voltage of a second power supply;
when the second power supply voltage is lower than a reference value, sequentially controlling the three-phase interleaved bidirectional high-conversion-ratio DCDC converter as claimed in any one of claims 1 to 6 by adopting a time sequence from T1 to T6 in a control period so as to enable the converter to work in a Boost mode, wherein the first power supply is in a discharge mode;
when the second power voltage is higher than the reference value, sequentially controlling the three-phase interleaved bidirectional large-transformation-ratio DCDC converter of any one of claims 1-6 to work in a Buck mode and the first power supply in a charging mode by using a T1 '-T6' sequence in one control period.
8. The method according to claim 7, wherein: the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are all composed of parallel transistors, and the fourth switching tube and the sixth switching tube are all composed of two reverse parallel transistors;
when the switching tube is controlled by T1, T3 and T5 time sequences, the first switching tube, the third switching tube and the fifth switching tube are all conducted, and the other switching tubes are all turned off;
when the switching tube is controlled by a T2 time sequence, the first switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all switched on, and the other switching tubes are all switched off;
when the timing sequence is controlled by T4, the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all switched on, and the other switch tubes are all switched off;
when the voltage is controlled by the T6 time sequence, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are all switched on, and the other switch tubes are all switched off.
9. The method according to claim 7, wherein: the first switching tube, the second switching tube, the third switching tube, the fifth switching tube and the seventh switching tube are all composed of parallel transistors, and the fourth switching tube and the sixth switching tube are all composed of two reverse parallel transistors;
under the control of the T1' timing sequence: the second switching tube, the third switching tube, the fourth switching tube and the fifth switching tube are all switched on, and the other switching tubes are all switched off;
when the switching tube is controlled by a T3' time sequence, the first switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are all switched on, and the other switching tubes are all switched off;
when the timing sequence is controlled by T5', the first switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all switched on, and the other switch tubes are all switched off;
when the timing sequence is controlled by T2 ', T4 ' and T6 ', the first switch tube, the third switch tube and the fifth switch tube are all turned on, and the rest switch tubes are all turned off.
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