CN212258788U - Bidirectional direct current converter - Google Patents
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- CN212258788U CN212258788U CN202020471774.3U CN202020471774U CN212258788U CN 212258788 U CN212258788 U CN 212258788U CN 202020471774 U CN202020471774 U CN 202020471774U CN 212258788 U CN212258788 U CN 212258788U
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- 230000002457 bidirectional effect Effects 0.000 title claims description 20
- 239000003990 capacitor Substances 0.000 claims description 30
- 238000004146 energy storage Methods 0.000 claims description 26
- 238000005259 measurement Methods 0.000 description 11
- 238000001514 detection method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
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Abstract
The utility model discloses a two-way DC converter, including input and output, first support electric capacity C1, second support electric capacity C2, first voltage-sharing resistance R1, second voltage-sharing resistance R2, low pressure tank circuit and control module. A first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module are sequentially connected in series between the input end and the output end; the control module is in signal connection with the first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module. According to the utility model discloses a two-way DC converter can be used to the well electric current of adjustment boats and ships power supply system, and it has first equalizer resistor R1 and second equalizer resistor R2 can restrain the unbalance of terminal voltage, but also has control module in order to a plurality of IGBT module output drive signal, thereby adjusts the terminal voltage of the balanced two sets of electric capacity of duty cycle of a plurality of IGBT modules, protects two-way DC converter from this and improves its life.
Description
Technical Field
The utility model relates to a direct current distribution type boats and ships electric propulsion system technical field, more specifically relates to a two-way direct current converter.
Background
In the field of ship power, in order to meet the requirements of energy conservation and emission reduction, the ship industry attaches more and more importance to the direct current of a power supply and distribution system, and compared with direct propulsion and alternating current propulsion of a diesel engine, the direct current propulsion system has the advantages of better energy consumption ratio, smaller occupied space and lighter equipment weight, can effectively reduce the oil consumption of ships, improves the integration level of the propulsion system, and promotes the effective load of the ships.
In the prior art, part of bidirectional dc converters can be used in a ship power system, and during operation, due to voltage changes, the bidirectional dc converters may have components that are subject to too high voltage, which may affect performance and life, or even may damage a power supply system.
Therefore, it is desirable to provide a bidirectional dc converter to at least partially solve the above problems.
SUMMERY OF THE UTILITY MODEL
In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.
The utility model provides a two-way DC converter, include:
the power supply comprises an input end and an output end, wherein a first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module are sequentially connected in series between the input end and the output end;
a first support capacitance C1, the first support capacitance C1 being connected between the input and the junction between the second IGBT module and the third IGBT module;
a second support capacitance C2, the second support capacitance C2 being connected between the output and the junction between the second IGBT module and the third IGBT module;
the first voltage equalizing resistor R1 is connected in parallel to two ends of the first supporting capacitor C1 through the first voltage equalizing resistor R1;
the second voltage equalizing resistor R2 is connected in parallel to two ends of the second supporting capacitor C2 through the second voltage equalizing resistor R2;
the two ends of the low-voltage energy storage circuit are respectively connected to the joint between the first IGBT module and the second IGBT module and the joint between the third IGBT module and the fourth IGBT module, and a reactor L is arranged on the low-voltage energy storage circuit; and
and the control module is in signal connection with the first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module.
According to the utility model discloses a two-way DC converter, can be used to boats and ships driving system, can adjust the electric current in the boats and ships power supply system, it has first equalizer resistance R1 and the unbalance that second equalizer resistance R2 can restrain the terminal voltage, and still have control module in order to a plurality of IGBT module output drive signal, thereby adjust the terminal voltage of the balanced two sets of electric capacity of duty cycle of a plurality of IGBT modules, thereby can avoid setting up the part among them to bear too high voltage effectively, guarantee performance, and service life is prolonged, thereby ensure power supply system's normal use.
Optionally, the control module comprises:
the first driving module is in signal connection with the first IGBT module and the second IGBT module; and
and the second driving module is in signal connection with the third IGBT module and the fourth IGBT module.
Optionally, the low-voltage energy storage circuit further comprises an energy storage battery connected in series with the reactor L.
Optionally, the positive terminal of the energy storage battery is connected to the connection between the first IGBT module and the second IGBT module, and the negative terminal of the energy storage battery is connected to the connection between the third IGBT module and the fourth IGBT module.
Optionally, the reactor L is disposed between the positive terminal of the energy storage battery and the connection between the first IGBT module and the second IGBT module.
Optionally, the first IGBT module includes a first diode and a first IGBT arranged in parallel with each other, a cathode of the first diode and a collector of the first IGBT are connected to the input terminal, and an anode of the first diode and an emitter of the first IGBT are connected to the second IGBT module; and
the second IGBT module comprises a second diode and a second IGBT which are arranged in parallel, the negative pole of the second diode and the collector of the second IGBT are connected to the first IGBT module, and the positive pole of the second diode and the emitter of the second IGBT are connected to the third IGBT module.
Optionally, the third IGBT module includes a third diode and a third IGBT arranged in parallel with each other, a cathode of the third diode and a collector of the third IGBT are connected to the second IGBT module, and an anode of the third diode and an emitter of the third IGBT are connected to the fourth IGBT module; and
the fourth IGBT module comprises a fourth diode and a fourth IGBT which are connected in parallel, the negative electrode of the fourth diode and the collector electrode of the fourth IGBT are connected to the third IGBT module, and the positive electrode of the fourth diode and the emitter electrode of the fourth IGBT are connected to the output end.
Optionally, the input end is connected with a high-voltage positive electrode, and the output end is connected with a high-voltage negative electrode.
Drawings
The following drawings of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings, embodiments and descriptions of the invention, which are used to explain the principles of the invention.
In the drawings:
fig. 1 is a schematic view of a topology of a bidirectional dc converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the signal flow direction in the bidirectional dc converter shown in fig. 1; and
fig. 3 is a schematic diagram of a control method for duty cycle adjustment according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.
It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. In the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same elements are denoted by the same reference numerals, and thus the description thereof will be omitted.
The utility model provides a two-way DC converter is established ties by two-stage buck-boost structure and is constituteed, respectively has a set of support electric capacity at high voltage direct current side each grade, equally divides to support high voltage side direct current voltage under normal conditions. Specifically, as shown in fig. 1, the bidirectional dc converter has an input terminal for connecting a high-voltage positive electrode and an output terminal for connecting a high-voltage negative electrode, and a first IGBT module S1, a second IGBT module S2, a third IGBT module S3 and a fourth IGBT module S4 are sequentially connected in series between the input terminal and the output terminal. The IGBT module has the advantages of high voltage resistance, high input impedance, low conduction voltage drop and high switching speed, and can be used for a high-direct-current-voltage converter system. The IGBT modules are sequentially connected in series, so that the voltage acceptable by the composite energy storage device can be increased, and the voltage up to 5000V can be accepted to the maximum extent according to the setting requirement. The first IGBT module S1, the second IGBT module S2, the third IGBT module S3 and the fourth IGBT module S4 respectively form a half-bridge structure, and the two half-bridges form a cascade structure. A first support capacitor C1 is connected between the input terminal and the junction between the second IGBT module S2 and the third IGBT module S3, and a second support capacitor C2 is connected between the output terminal and the junction between the second IGBT module S2 and the third IGBT module S3, and preferably, the first support capacitor C1 and the second support capacitor C2 may be used for flat wave. Among them, an IGBT (Insulated Gate Bipolar Transistor) is an Insulated Gate Bipolar Transistor.
Further, the bidirectional direct current converter comprises a first equalizing resistor R1 and a second equalizing resistor R2. The first voltage-sharing resistor R1 is connected in parallel with the first supporting capacitor C1, that is, two ends of the first voltage-sharing resistor R1 are respectively connected to two ends of the first supporting capacitor C1; the second voltage equalizing resistor R2 is connected in parallel with the second supporting capacitor C2, i.e., two ends of the second voltage equalizing resistor R2 are respectively connected to two ends of the second supporting capacitor C2.
In addition, the bidirectional direct current converter further comprises a low-voltage energy storage circuit, two ends of the low-voltage energy storage circuit are respectively connected to a joint between the first IGBT module S1 and the second IGBT module S2 and a joint between the third IGBT module S3 and the fourth IGBT module S4, and a reactor L is arranged on the low-voltage energy storage circuit.
Further, the bidirectional dc converter further includes a control module, and the control module is in signal connection with the first IGBT module S1, the second IGBT module S2, the third IGBT module S3, and the fourth IGBT module S4, so as to output a driving signal to the plurality of IGBT modules and adjust duty ratios of the plurality of IGBT modules.
According to the utility model discloses a two-way DC converter, can be used to boats and ships driving system, can adjust the electric current in the boats and ships power supply system, it has first equalizer resistance R1 and the unbalance that second equalizer resistance R2 can restrain the terminal voltage, and still have control module in order to a plurality of IGBT module output drive signal, thereby adjust the terminal voltage of the balanced two sets of electric capacity of duty cycle of a plurality of IGBT modules, thereby can avoid setting up the part among them to bear too high voltage effectively, guarantee performance, and service life is prolonged, thereby ensure power supply system's normal use.
Specifically, in order to adjust the duty ratio of each IGBT module, the control module in this embodiment further includes a first driving module and a second driving module. The first driving module is in signal connection with the first IGBT module S1 and the second IGBT module S2 to adjust duty ratios of the first IGBT module S1 and the second IGBT module S2, wherein a signal for controlling the second IGBT module S2 is an inverse phase of a signal for controlling the first IGBT module S1; the second driving module is in signal connection with the third IGBT module S3 and the fourth IGBT module S4 for adjusting duty cycles of the third IGBT module S3 and the fourth IGBT module S4, wherein a signal controlling the fourth IGBT module S4 is an inverse of a signal of the third IGBT module S3. The driving signal PWM1 provided by the first driving module and the driving signal PWM2 provided by the second driving module are capable of controlling the flow of energy between the high-voltage side and the low-voltage side. Of course, in other embodiments, which are not shown, other adjusting devices or other connections similar to the first and second drive modules may also be provided.
Further, the low-voltage energy storage circuit further comprises an energy storage battery connected in series with the reactor L, and the energy storage battery can be a lithium battery or a super capacitor, for example. Wherein the positive terminal of the energy storage battery is connected to the connection between the first IGBT module S1 and the second IGBT module S2, and the negative terminal of the energy storage battery is connected to the connection between the third IGBT module S3 and the fourth IGBT module S4.
Further, a reactor L is provided between the positive terminal of the energy storage battery and the connection between the first IGBT module S1 and the second IGBT module S2. Of course, in other embodiments, the reactor L may be disposed in other positions.
In the present embodiment, as shown in fig. 1, the first IGBT module S1 includes a first diode and a first IGBT arranged in parallel with each other, a cathode of the first diode and a collector of the first IGBT are connected to the input terminal, and an anode of the first diode and an emitter of the first IGBT are connected to the second IGBT module S2; the second IGBT module S2 includes a second diode and a second IGBT arranged in parallel with each other, a cathode of the second diode and a collector of the second IGBT are connected to the first IGBT module S1, and an anode of the second diode and an emitter of the second IGBT are connected to the third IGBT module S3.
The third IGBT module S3 includes a third diode and a third IGBT arranged in parallel with each other, a cathode of the third diode and a collector of the third IGBT are connected to the second IGBT module S2, and an anode of the third diode and an emitter of the third IGBT are connected to the fourth IGBT module S4; the fourth IGBT module S4 includes a fourth diode and a fourth IGBT connected in parallel with each other, a cathode of the fourth diode and a collector of the fourth IGBT are connected to the third IGBT module S3, and an anode of the fourth diode and an emitter of the fourth IGBT are connected to the output terminal.
In this embodiment, when the difference between the terminal voltages of the first supporting capacitor C1 and the second supporting capacitor C2 is large, the voltage loading may be different when the first IGBT module S1 and the second IGBT module S2 and the third IGBT module S3 and the fourth IGBT module S4 operate, so that different driving signals PWM1 and PWM2 may be provided by the first driving module and the second driving module, and the voltage difference between the first supporting capacitor C1 and the second supporting capacitor C2 is equalized by using the phase difference of the driving signals, so as to be controlled within an acceptable range. Hereinafter, how to control the bidirectional dc converter in the present embodiment will be further described by the first driving module and the second driving module.
Illustratively, as shown in fig. 2, when the driving signal PWM1 provided by the first driving module is 1 and the driving signal PWM2 provided by the second driving module is 0, the first IGBT module S1 is turned on, the second IGBT module S2 is turned off, the third IGBT module S3 is turned on, the fourth IGBT module S4 is turned off, the power in the bidirectional dc converter flows to the dotted line P1 in fig. 2, and energy exchange is realized between the first support capacitor C1 and the energy storage battery. When the driving signal PWM1 provided by the first driving module is 0 and the driving signal PWM2 provided by the second driving module is 1, the first IGBT module S1 is turned off, the second IGBT module S2 is turned on, the third IGBT module S3 is turned off, the fourth IGBT module S4 is turned on, the flow of power in the bidirectional dc converter is as shown by a dotted line P2 in fig. 2, and energy exchange is realized between the second supporting capacitor C2 and the energy storage battery. In the above control mode, when the first supporting capacitor C1 and the second supporting capacitor C2 charge the energy storage battery, the terminal voltages of the first supporting capacitor C1 and the second supporting capacitor C2 decrease; when the energy storage battery discharges to the first supporting capacitor C1 and the second supporting capacitor C2, the terminal voltages of the first supporting capacitor C1 and the second supporting capacitor C2 increase. Therefore, voltage-sharing control of the first supporting capacitor C1 and the second supporting capacitor C2 can be realized by controlling the driving signals PWM1 and PWM 2.
In order to facilitate the control of the bidirectional dc converter, the present embodiment may further include a first voltage detection device, a second voltage detection device, and a current detection device. The first voltage detection device is used for obtaining a first voltage measurement value V of the first voltage-sharing resistor R1C1(ii) a The second voltage detection device is used for acquiring a second voltage measurement value V of the second equalizing resistor R2C2(ii) a The current detection device is used for obtaining a current measurement value I of the reactor LL。
Correspondingly, as shown in fig. 3, the present embodiment further provides a control method for the bidirectional dc converter, where the control method includes:
obtaining a first voltage measurement value V of a first voltage-sharing resistor R1C1And a second voltage measurement V of a second voltage grading resistor R2C2Outputting a duty ratio correction value dPressure equalizing；
Obtaining a current measurement value I of the reactor LLOutputting a current direction value;
obtaining the duty ratio correction value dPressure equalizingAnd a current direction value outputting a plurality of duty ratio set values for the first IGBT module S1, the second IGBT module S2, the third IGBT module S3, and the fourth IGBT module S4, respectively.
Specifically, a first voltage measurement value V is obtainedC1And a second voltage measurement value VC2Then, the duty ratio correction value d is outputtedPressure equalizingWherein the initial correction value d is determined according to the following formula:
d＝(VC1-VC2)×2-(VC1+VC2)；
in the above formula, d represents an initial correction value d, VC1And VC2Respectively representing a first voltage measurement and a second voltage measurement;
then, the obtained initial correction value d is input to the PI control module 300, and the duty ratio correction value d is outputPressure equalizing。
In addition, the measured value of the current I is obtainedLThereafter, the current direction value is further determined using the LPF low pass filter module 100 and the Sgn step function module 200. Illustratively, the LPF low pass filter module 100 obtains a current measurement ILThen, the obtained intermediate value is transmitted to the Sgn step function module 200, and the current direction value is determined by the Sgn step function module 200.
Then, duty ratio correction value dPressure equalizingFurther determining direction based on the current direction value, and determining duty ratio correction value d of the directionPressure equalizingAdding the current transformer main power control loop output value d1 to obtain a drive signal PWM1, and determining a duty ratio correction value d of the directionPressure equalizingAnd differenced with the converter main power control loop output value d2 to derive the drive signal PWM 2. Therefore, the performance and the service life of the bidirectional direct current converter are improved by adjusting the difference between the voltages at the two groups of capacitor terminals of the plurality of IGBT modules.
The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many more modifications and variations are possible in light of the teaching of the present invention and are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A bi-directional dc converter, comprising:
the power supply comprises an input end and an output end, wherein a first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module are sequentially connected in series between the input end and the output end;
a first support capacitance C1, the first support capacitance C1 being connected between the input and the junction between the second IGBT module and the third IGBT module;
a second support capacitance C2, the second support capacitance C2 being connected between the output and the junction between the second IGBT module and the third IGBT module;
the first voltage equalizing resistor R1 is connected to two ends of the first supporting capacitor C1 in parallel through the first voltage equalizing resistor R1;
the second voltage equalizing resistor R2 is connected in parallel to two ends of the second supporting capacitor C2 through the second voltage equalizing resistor R2;
the two ends of the low-voltage energy storage circuit are respectively connected to the joint between the first IGBT module and the second IGBT module and the joint between the third IGBT module and the fourth IGBT module, and a reactor L is arranged on the low-voltage energy storage circuit; and
and the control module is in signal connection with the first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module.
2. The bi-directional dc converter according to claim 1, wherein said control module comprises:
the first driving module is in signal connection with the first IGBT module and the second IGBT module; and
and the second driving module is in signal connection with the third IGBT module and the fourth IGBT module.
3. The bi-directional dc converter according to claim 1, wherein said low voltage tank circuit further comprises a tank battery connected in series with said reactor L.
4. The bi-directional dc converter according to claim 3, wherein the positive terminal of the energy storage battery is connected to the junction between the first IGBT module and the second IGBT module, and the negative terminal of the energy storage battery is connected to the junction between the third IGBT module and the fourth IGBT module.
5. The bidirectional dc converter according to claim 4, wherein said reactor L is disposed between the positive terminal of the energy storage battery and the junction between said first IGBT module and said second IGBT module.
6. The bidirectional DC converter according to claim 1,
the first IGBT module comprises a first diode and a first IGBT which are arranged in parallel, the negative electrode of the first diode and the collector electrode of the first IGBT are connected to the input end, and the positive electrode of the first diode and the emitter electrode of the first IGBT are connected to the second IGBT module; and
the second IGBT module comprises a second diode and a second IGBT which are arranged in parallel, the negative pole of the second diode and the collector of the second IGBT are connected to the first IGBT module, and the positive pole of the second diode and the emitter of the second IGBT are connected to the third IGBT module.
7. The bidirectional DC converter according to claim 1,
the third IGBT module comprises a third diode and a third IGBT which are arranged in parallel, the cathode of the third diode and the collector of the third IGBT are connected to the second IGBT module, and the anode of the third diode and the emitter of the third IGBT are connected to the fourth IGBT module; and
the fourth IGBT module comprises a fourth diode and a fourth IGBT which are connected in parallel, the negative electrode of the fourth diode and the collector electrode of the fourth IGBT are connected to the third IGBT module, and the positive electrode of the fourth diode and the emitter electrode of the fourth IGBT are connected to the output end.
8. The bi-directional dc converter according to claim 1, wherein said input terminal is connected to a high voltage positive terminal and said output terminal is connected to a high voltage negative terminal.
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| CN202020471774.3U CN212258788U (en) | 2020-04-02 | 2020-04-02 | Bidirectional direct current converter |
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| CN202020471774.3U CN212258788U (en) | 2020-04-02 | 2020-04-02 | Bidirectional direct current converter |
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Assignee: SHANGHAI QIYAO HEAVY INDUSTRY CO.,LTD. Assignor: Shanghai Marine Diesel Engine Research Institute Contract record no.: X2021310000046 Denomination of utility model: Bidirectional DC converter Granted publication date: 20201229 License type: Common License Record date: 20211202 |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute |