CN107231089B - Bidirectional three-level H-bridge non-isolated DC-DC converter - Google Patents
Bidirectional three-level H-bridge non-isolated DC-DC converter Download PDFInfo
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- CN107231089B CN107231089B CN201710372256.9A CN201710372256A CN107231089B CN 107231089 B CN107231089 B CN 107231089B CN 201710372256 A CN201710372256 A CN 201710372256A CN 107231089 B CN107231089 B CN 107231089B
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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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a bidirectional three-level H-bridge non-isolated DC-DC converter. The converter is mainly applied to battery detection and battery formation equipment, realizes a direct current chopping function to charge and discharge a storage battery in a high-precision and wide-voltage range, and has more obvious advantages in application scenes of high input voltage (about 1000V) and high power. By adopting a three-level hardware topological structure, the voltage stress of a switching tube is reduced, the switch selection is simplified, the equivalent output switching frequency is improved, and the inductor volume and the equipment volume are reduced. The device mainly comprises two voltage-dividing capacitors, two diode-clamped three-level bridge arms, two groups of energy-storage inductors and two groups of filter capacitors. By effectively controlling the designed topological switch array, wide-range changes of output voltage and current can be realized, the polarity can be continuously adjusted between positive and negative, and the midpoint voltage balance is maintained.
Description
Technical Field
The invention relates to the field of non-isolated DC-DC conversion, in particular to an application place for bidirectional control of high output voltage and wide voltage and current range.
Background
Aiming at the application scenes of high output voltage, wide voltage and current range bidirectional control, the existing documents and products are searched, and no proper power electronic topology meets the requirements. The two-level bidirectional H-bridge DC-DC converter proposed in the article "research on multiple bidirectional H-bridge DC/DC converters" can realize wide voltage range output, but is only suitable for lower voltage level occasions. The three-level topology is suitable for high voltage applications, but it is currently applied to bidirectional AC/DC, such as patent CN 201510846654.0.
In order to solve the problems, through research, the application provides a three-level H-bridge bidirectional non-isolated DC-DC converter, two bridge arms of an H bridge are replaced by a middle-point clamping type three-level bridge arm, and the double advantages of the three-level H bridge are combined. The topological structure can select the switching tube with lower voltage-resistant grade, and the switching loss is reduced. In addition, the equivalent output switching frequency is improved, and the inductance is reduced.
Disclosure of Invention
The invention relates to a bidirectional three-level H-bridge non-isolated DC-DC converter, wherein the converter topology mainly comprises a power supply, a voltage division capacitor, a diode clamp type three-level bridge arm, an energy storage inductor and a filter capacitor. The voltage of the power supply is equally divided by the voltage dividing capacitor to form a half power supply voltage potential, and a basic condition is provided for reducing the voltage borne by the switching tube. The two bridge arms, the two groups of energy storage inductors and the filter capacitor form an H-bridge main power loop. The H bridge can be regarded as formed by reversely connecting two sets of BUCK-BOOST circuits in series in the working process, a left three-level bridge arm, a left filter capacitor and an energy storage inductor form a set to form a half-bridge circuit H1, and the right side of the H bridge is provided with another set of half-bridge circuit H2.
A three-level bridge arm uses four switching tubes, the four switching tubes are connected in series end to end, and two sides of each switching tube are connected with a diode in an anti-parallel mode. And the other diode is connected in series in the forward direction, the cathode of the diode is connected between the two upper switching tubes, the anode of the diode is connected between the two lower switching tubes, and the connection position of the diode is connected to the middle point Z of the two voltage division capacitors. The connecting point of the middle two switching tubes is connected to an energy storage inductor, the other side of the energy storage inductor is connected with the positive electrode of a filter capacitor, and the negative electrode of the filter capacitor is connected to the negative electrode of a power supply.
When the switch works, two of the switch tubes are conducted at the same time each time, and the other two non-conducted switch tubes bear half of the power supply voltage. Compared with a two-level structure, the voltage borne by the switching tube during turn-off is reduced by half, so that the withstand voltage value of the switching tube is also reduced by half during device type selection. The method comprises the steps that when two upper switching tubes of a three-level bridge arm are conducted simultaneously, a P state is defined, the middle two switching tubes are conducted simultaneously, an O state is defined, and the lower two switching tubes are conducted simultaneously, an N state is defined. The switching tube operates mainly in the P and N states and the two states operate complementarily. The O state is a transition state in the process of switching the two switch states with each other. By calculating the action time of the P or N state and carrying out triangular wave carrier modulation, the corresponding trigger pulse of each switching tube can be obtained. When the circuit works in the BUCK mode, the current of the voltage division capacitor flows out from the middle point when in the O state, and when the circuit works in the BOOST mode, the current flows into the voltage division capacitor when in the O state. The current flowing in and out is difficult to reach the natural balance, so that the voltage of the lower voltage dividing capacitor is difficult to maintain at half of the power supply voltage. The O-state action time of the H1 and H2 bridge arms is adjusted according to the deviation amount of the voltages of the two voltage-dividing capacitors, the dynamic balance of the current flowing out of the midpoint and the current flowing into the midpoint can be controlled, and the midpoint voltage balance is realized.
The innovation of the application mainly comprises the following points:
1. the output voltage and the current can be switched between positive and negative polarities smoothly.
2. The output voltage and current can be changed in a wide range and with high precision.
3. The voltage balance of the midpoint potential of the voltage-sharing capacitor can be realized.
Drawings
FIG. 1 shows a topology diagram of a bidirectional three-level H-bridge non-isolated DC-DC converter;
FIG. 2 shows a flow chart of a capacitance midpoint voltage balance control strategy;
fig. 3 shows a voltage waveform diagram of two voltage-dividing capacitors after being controlled in operation.
Detailed Description
Hereinafter, specific embodiments of the present application will be described with reference to the accompanying drawings.
As shown in fig. 1, two voltage dividing capacitors C1 and C2 are connected in series end to end and connected in parallel between the positive and negative poles of the power supply DC, so as to divide the voltage of the power supply. The H bridge is composed of two three-level half-bridge circuits H1 and H2, and H1 and H2 are connected between the positive electrode and the negative electrode of the power supply in parallel.
In the half-bridge circuit H1, four switching tubes T1-T4 are connected in series end to end, and a diode D1-D4 is connected in parallel to each tube in reverse, which is called diode clamp type three-level topology. In addition, two diodes D9 and D10 are connected in series in the forward direction, the cathode is connected between the T1 and T2 switch tubes, the anode is connected between the T3 and T4 switch tubes, and the junction of D9 and D10 is connected to the midpoint Z of two voltage-dividing capacitors C1 and C2. Then the energy storage inductor L1 is connected to the connecting point of the T2 and the T3 switching tube, the other side of the L1 is connected with the anode of the filter capacitor C3, and the cathode of the C3 is connected to the cathode of the power supply DC.
The half-bridge circuit H2 is built exactly in the same way as the half-bridge circuit H1. The half-bridge circuit H2 has four switching tubes T5-T8 connected in series end to end, and a diode D5-D8 connected in parallel at two sides of each tube in reverse, which is called diode clamp type three-level topology. In addition, two diodes D11 and D12 are connected in series in the forward direction, the cathode is connected between the T5 and T6 switch tubes, the anode is connected between the T7 and T8 switch tubes, and the junction of D11 and D12 is connected to the midpoint Z of two voltage-dividing capacitors C1 and C2. Then the energy storage inductor L2 is connected to the connecting point of the T6 and the T7 switching tube, the other side of the L2 is connected with the anode of the filter capacitor C4, and the cathode of the C4 is connected to the cathode of the power supply DC.
Thus, the basic topology of the three-level H-bridge is well established. The control principle of the topology is explained below by taking the application of the H-bridge to charging and discharging the battery as an example.
The three-level H bridge is controlled, and charging and discharging of a battery and balance control of midpoint voltage of a capacitor are mainly achieved according to a preset value. For convenience of analysis and simplification of the circuit, the H1 and H2 circuits can be equivalent to two direct current sources, the cathodes of the two direct current sources are connected together, and a battery is connected between the anodes. Ideally, both dc source output voltages can range from zero to the bus voltage. Therefore, through the matching of the left and right circuits, the output of any voltage value between zero volt and the bus voltage can be realized, and only the kirchhoff voltage law is satisfied.
The positive electrode of the battery is connected to the half-bridge circuit H1, the negative electrode of the battery is connected to the half-bridge circuit H2, namely, the positive electrode and the negative electrode of the battery are respectively connected to the connection parts of the two energy storage inductors and the filter capacitor, and H1 and H2 are matched with each other to charge and discharge the battery. The battery is connected between the two groups of circuits, when the positive pole and the negative pole of the battery are respectively connected with H1 and H2: if the battery is charged, H1 works in BUCK mode to obtain energy from the power supply and flow to the battery, H2 works in BOOST mode to reversely transmit the current flowing out of the battery to the power supply, so that the current flows out of the positive electrode of the battery into the negative electrode of the battery; when the battery is discharged, H1 operates in BOOST mode to return the energy discharged from the battery to the power supply, and H2 operates in BUCK mode to supply the current from the power supply to the battery so that the current flows from the negative electrode to the positive electrode of the battery. When the positive and negative electrodes of the battery are reversely connected, the operation modes of H1 and H2 are opposite to the above operation modes.
The half-bridge circuits H1 and H2 respectively use four switching tubes, when in work, two switching tubes are conducted at the same time, and the other two non-conducting switching tubes bear half of the power supply voltage. Compared with a two-level structure, the voltage borne by the switching tube during turn-off is reduced by half, so that the withstand voltage value of the switching tube is also reduced by half during device type selection. The upper two switching tubes T1-T2 or T5-T6 of the three-level bridge arm are defined as P state when being simultaneously conducted, the middle two switching tubes T2-T3 or T6-T7 are simultaneously conducted and defined as O state, and the lower two switching tubes T3-T4 or T7-T8 are simultaneously conducted and defined as N state. The switching tube mainly works in the P state and the N state, and the two states work in a complementary mode. The O state is a transition state in the process of switching the two switch states with each other. By calculating the action time of the P or N state and carrying out triangular wave carrier modulation, the corresponding trigger pulse of each switching tube can be obtained.
When the circuit works in the BUCK mode, the current of the voltage division capacitor flows out from the middle point when in the O state, and when the circuit works in the BOOST mode, the current flows into the voltage division capacitor when in the O state. The current flowing in and out is difficult to reach the natural balance, so that the voltage of the lower voltage dividing capacitor is difficult to maintain at half of the power supply voltage.
The O-state action time of the H1 and H2 bridge arms is adjusted according to the deviation amount of the voltages of the two voltage-dividing capacitors, the dynamic balance of the current flowing out of the midpoint and the current flowing into the midpoint can be controlled, and the midpoint voltage balance is realized.
In order to simplify the control steps, a fixed duty ratio is given to a switching tube of H2, on the premise of not carrying out midpoint control, the action time of P, O, N state of the bridge arm in H2 accounts for 0.2, 0.1 and 0.7 of the switching period respectively, the action time of O state of the bridge arm in H1 accounts for 0.1 of the switching period, and the action time of P and N states needs to be regulated in a closed loop mode so as to charge and discharge the battery according to a preset voltage or current value.
In order to realize the balance control of the midpoint voltage, the action time of O states of H1 and H2 needs to be adjusted, and the action time range of the O states is set to be 0.05-0.15 times of the switching period. When the battery is charged, if the lower capacitor voltage is less than one half of the power supply voltage, the O state action time delta T of H2 needs to be increased, and the O state action time delta T of H1 needs to be reduced; if the lower side capacitor voltage is greater than one-half of the power supply voltage, the O state action time delta T of H2 needs to be reduced, the O state action time delta T of H1 needs to be increased, and when the capacitor voltage deviation value is smaller than the allowable deviation value, the O state action time on the two sides is kept unchanged. The changes of the O state action time of H1 and H2 during the discharging of the battery are opposite, and in the O state action time change process, the P state action time and the N state action time are respectively changed by delta T/2. The midpoint voltage adjusting process is shown in fig. 2: the P, O, N state action time of H1 and H2 is controlled respectively according to the voltage magnitude relation of the voltage dividing capacitors C1 and C2. According to the principle, the voltage initial values of the voltage-dividing capacitors are respectively 200V and 800V to be simulated, the voltages of the two voltage-dividing capacitors reach an equilibrium state by adjusting the action time of O states on two sides, the effectiveness of the control method is explained, and the voltage change waveforms of the voltage-dividing capacitors are shown in FIG. 3.
Claims (6)
1. A bidirectional three-level H-bridge non-isolated DC-DC converter is characterized in that the topology of the converter comprises a power supply, a voltage division capacitor, a diode clamp type three-level bridge arm, an energy storage inductor and a filter capacitor, and the converter comprises: the three-level bridge comprises two voltage division capacitors, two diode clamp type three-level bridge arms, two groups of energy storage inductors and a filter capacitor; the diode-clamped three-level bridge arm, the energy storage inductor and the filter capacitor form an H-bridge main power loop, the H-bridge main power loop comprises a half-bridge circuit H1 and a half-bridge circuit H2, and the half-bridge circuit H1 consists of one diode-clamped three-level bridge arm on the left side, one group of the energy storage inductor and one group of the filter capacitor; the half-bridge circuit H2 is composed of the other diode clamp type three-level bridge arm on the right side, the other group of the energy storage inductor and the filter capacitor; each diode clamping type three-level bridge arm comprises four switching tubes which are connected in series end to end, the four switching tubes which are connected in series are a first switching tube, a second switching tube, a third switching tube and a fourth switching tube in sequence, and two sides of each switching tube are connected with a diode in an anti-parallel mode; the connecting point of the second switching tube and the third switching tube is connected to the energy storage inductor, the other side of the energy storage inductor is connected with the anode of the filter capacitor, and the cathode of the filter capacitor is connected to the cathode of the power supply; the H-bridge main power loop is equivalent to reverse series connection of two groups of BUCK-BOOST circuits in the working process, the first switch tube and the second switch tube are defined as a P state when being conducted simultaneously, the second switch tube and the third switch tube are conducted simultaneously and defined as an O state, the third switch tube and the fourth switch tube are conducted simultaneously and defined as an N state, the switch tubes work in the P state and the N state, the two states work in a complementary mode, and the O state is a transition state in the process of mutually switching the states of the two switch tubes; the half-bridge circuit H1 and the half-bridge circuit H2 are connected in parallel between the positive and negative poles of the power supply.
2. A bidirectional three-level H-bridge non-isolated DC-DC converter according to claim 1, characterized in that: the voltage of the power supply is equally divided by the voltage dividing capacitor to form a half power supply voltage potential.
3. A bidirectional three-level H-bridge non-isolated DC-DC converter according to claim 1, characterized in that: the half-bridge circuits H1 and H2 further respectively comprise two diodes connected in forward series, cathodes of the two diodes in series are connected between the first switching tube and the second switching tube, anodes of the two diodes in series are connected between the third switching tube and the fourth switching tube, and a connection position of the two switching tubes in series is connected to a middle point Z of the two voltage dividing capacitors.
4. A bidirectional three-level H-bridge non-isolated DC-DC converter according to claim 1, characterized in that: and obtaining the corresponding trigger pulse of each switching tube by calculating the action time of the P or N state and carrying out triangular wave carrier modulation.
5. The bi-directional three-level H-bridge non-isolated DC-DC converter of claim 4, wherein: when the half-bridge circuit H1 or H2 operates in BUCK mode, the voltage dividing capacitance current will flow out from the middle point in O state; when the half-bridge circuit H1 or H2 operates in BOOST mode, current flows into the voltage dividing capacitor in the O state.
6. The bi-directional three-level H-bridge non-isolated DC-DC converter of claim 5, wherein: and adjusting the O-state action time of the diode clamp type three-level bridge arm according to the deviation amount of the voltages of the two voltage-dividing capacitors so as to control the dynamic balance of the currents flowing out of and into the midpoint and realize the midpoint voltage balance.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108054920B (en) * | 2017-12-22 | 2020-06-02 | 科华恒盛股份有限公司 | DCDC converter |
| CN108054919B (en) * | 2017-12-22 | 2019-06-14 | 科华恒盛股份有限公司 | A kind of control method of dcdc converter |
| CN110031679B (en) * | 2019-03-28 | 2022-06-03 | 广东工业大学 | Internal resistance testing method based on chemical composition capacitance-grading power supply |
| CN110868092B (en) * | 2019-11-28 | 2020-08-25 | 湖北嘉辰达新能源科技有限公司 | Three-level phase-shifted full-bridge high-power supply |
| WO2021138912A1 (en) * | 2020-01-10 | 2021-07-15 | 西门子股份公司 | Direct current-direct current converter |
| CN111525815B (en) * | 2020-06-05 | 2021-09-03 | 阳光电源股份有限公司 | Bidirectional DCDC conversion circuit, energy storage converter and charge-discharge control method |
| CN114070042B (en) * | 2020-08-06 | 2024-06-04 | 华为数字能源技术有限公司 | Three-level resonant DCDC converter and voltage equalizing control method |
| CN113131742B (en) * | 2021-03-09 | 2022-04-15 | 广州金升阳科技有限公司 | Wide voltage input four-tube Buck-Boost circuit |
| CN114172381B (en) * | 2022-02-11 | 2022-04-15 | 四川大学 | Capacitive energy storage type isolation DC-DC converter and control method thereof |
| CN115378276A (en) * | 2022-09-09 | 2022-11-22 | 山东大学 | Bidirectional power conversion topology, method and system for power battery test excitation power supply |
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| CN1913321A (en) * | 2006-08-09 | 2007-02-14 | 北京四方清能电气电子有限公司 | DC voltage balance control method of three-level inverter |
| CN102957151A (en) * | 2011-08-22 | 2013-03-06 | 台达电子企业管理（上海）有限公司 | Power compensation device and power compensation method for renewable energy source system |
| CN106374596A (en) * | 2016-09-13 | 2017-02-01 | 华北电力大学（保定） | Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor |
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| CN1270438C (en) * | 2004-08-20 | 2006-08-16 | 清华大学 | Variable frequency driving device of 3KV-10KV middle-high voltage multi-level three-phase AC motor |
| CN101515763B (en) * | 2009-03-27 | 2010-11-10 | 南京航空航天大学 | Series-parallel connection output tri-level half-bridge inverter and half period hysteresis control method thereof |
| CN105703621B (en) * | 2016-04-06 | 2019-02-05 | 重庆大学 | Tri- level Buck converter of ISOP and neutral-point potential balance control method |
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| CN1913321A (en) * | 2006-08-09 | 2007-02-14 | 北京四方清能电气电子有限公司 | DC voltage balance control method of three-level inverter |
| CN102957151A (en) * | 2011-08-22 | 2013-03-06 | 台达电子企业管理（上海）有限公司 | Power compensation device and power compensation method for renewable energy source system |
| CN106374596A (en) * | 2016-09-13 | 2017-02-01 | 华北电力大学（保定） | Non-isolation type three-phase three-level V2G charge-discharge topological structure and control method therefor |
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