CN211127587U - Wide-range constant-power bidirectional direct-current converter - Google Patents
Wide-range constant-power bidirectional direct-current converter Download PDFInfo
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- CN211127587U CN211127587U CN201922180195.3U CN201922180195U CN211127587U CN 211127587 U CN211127587 U CN 211127587U CN 201922180195 U CN201922180195 U CN 201922180195U CN 211127587 U CN211127587 U CN 211127587U
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Abstract
The utility model relates to a two-way direct current converter of wide range constant power, include: the voltage-sharing control system comprises a primary side input switch module, a transformer module, a secondary side output switch module, a voltage-sharing control network, an output module and a high-low voltage mode switching network which are sequentially connected, wherein the high-low voltage mode switching network is switched between a first mode and a second mode, so that the wide-range constant-power bidirectional direct current converter outputs a first voltage or a second voltage. Implement the utility model discloses a two-way direct current converter of wide range constant power through setting up high low pressure mode switching network, can realize wide range voltage constant power input output.
Description
Technical Field
The utility model relates to a power module field, more specifically say, relate to a two-way direct current converter of wide range constant power.
Background
With the increasing energy crisis and the increasing environmental awareness of people, new energy electric vehicles are the key points for research and application in various countries because of green and efficient energy utilization. Among them, the research on the charging and discharging equipment is more important. Battery voltage range of general electric vehicle: the voltage of the car is about 350V, the voltage of the battery of the midbus is about 400V-500V, and the voltage of the battery of the bus is about 600V. At present, the charging and discharging power supply modules of the electric automobile are mainly divided into three types according to the constant power voltage range: the first type constant power voltage range is 375V-500V; the voltage range of the second kind of constant power is 600V-750V; the third kind of constant power voltage range is 750V-1000V. In the traditional engineering application, different topological structures need to be designed according to different constant power voltage ranges, and wide-range voltage constant power input and output cannot be realized. Further, the problems of increased installation and design costs, inconvenience in use, and the like are caused.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a can effectively reliably realize wide range voltage constant power input and output's wide range constant power bidirectional direct current converter.
The utility model provides a technical scheme that its technical problem adopted is: constructing a wide-range constant-power bidirectional direct-current converter, comprising: the transformer comprises a primary side input switch module, a transformer module, a secondary side output switch module, a voltage-sharing control network, an output module and a high-low voltage mode switching network which are sequentially connected, wherein the transformer module comprises a first transformer network and a second transformer network; the first primary side input switch network is connected between an input power supply and the primary side of a first transformer network, the second primary side input switch network is connected between the input power supply and the primary side of a second transformer network, the first secondary side output switch network and the second secondary side output switch network are connected between the secondary side of the first transformer network, the secondary side of the second transformer network and the voltage-sharing control network in a cross mode, the first output network and the second output network are connected between the voltage-sharing control network and the high-low voltage mode switching network, and the high-low voltage mode switching network is switched between a first mode and a second mode to be connected in series or in parallel with the first output network and the second output network so that the wide-range constant-power bidirectional direct current converter outputs a first voltage or a second voltage.
In the wide-range constant-power bidirectional dc converter of the present invention, the high-low voltage mode switching network includes a first switch and a second switch; the first end of the first switch is connected with the first end of the first output network, the second end of the first switch is connected with the first end of the second output network, the first end of the second switch is connected with the second end of the first output network, the second end of the second switch is connected with the first end of the first output network, the third end of the second switch is connected with the first end of the second output network, the fourth end of the second switch is connected with the second end of the second output network, the second end of the first output network is the output anode of the wide-range constant-power bidirectional direct-current converter, and the second end of the second output network is the output cathode of the wide-range constant-power bidirectional direct-current converter; when the first switch is switched on and the second switch is switched off, the first output network and the second output network are connected in series, and when the first switch is switched off and the second switch is switched off, the first output network and the second output network are connected in parallel.
In the wide-range constant-power bidirectional dc converter of the present invention, the first switch and the second switch are air switches, power switch tubes, relays, or contactors.
The utility model discloses in the two-way DC converter of wide range constant power, the voltage-sharing control network includes at least first voltage-sharing control branch road and at least second voltage-sharing control branch road, first voltage-sharing control branch road includes first L C resonance unit and first diode voltage division unit, second voltage-sharing control branch road includes second L C resonance unit and second diode voltage division unit, the first end of first L C resonance unit, the other end connection of first secondary output switch network the partial pressure point of first diode voltage division unit, first diode voltage division unit is connected between the first end and the second end of second output network, the one end of second L C resonance unit is connected the first end of second secondary output switch network, the other end is connected the partial pressure point of second diode voltage division unit, second diode voltage division unit is connected between the first end and the second end of first output network.
The utility model discloses an among the two-way direct current converter of wide range constant power, first voltage-sharing control branch road further includes third L C resonance element and third diode voltage division unit, fourth voltage-sharing control branch road includes fourth L C resonance element and fourth diode voltage division unit, the second end of first secondary output switch network, the voltage division point of third diode voltage division unit is connected to the one end of third L C resonance element, the other end is connected, third diode voltage division unit is connected between the first end of second output network and the second end, the voltage division point of fourth diode voltage division unit is connected to the one end of fourth L C resonance element the second end of second secondary output switch network, the other end is connected, fourth diode voltage division unit is connected between the first end of first output network and second end.
In the wide-range constant-power bidirectional dc converter of the present invention, the first transformer network is directly connected in series to the primary side of the transformer in the second transformer network, and the first transformer network is connected in series to the secondary side of the transformer in the second transformer network.
In the wide-range constant-power bidirectional dc converter of the present invention, the first primary side input switch network and the second primary side input switch network and the first secondary side output switch network and the second secondary side output switch network respectively include a switch tube full-bridge network and/or a switch tube half-bridge network.
In the wide-range constant-power bidirectional dc converter of the present invention, the input filter network and the input power supply are connected to the output power supply network of the output terminal of the high-low voltage mode switching network.
In the wide-range constant-power bidirectional dc converter of the present invention, the input filter network includes at least one input filter capacitor, the first output network and the second output network include at least one output filter capacitor, respectively.
In the wide-range constant-power bidirectional dc converter of the present invention, the transformer module comprises N transformer networks, the primary input switch module comprises N primary input switch networks, the secondary output switch module comprises M secondary output switch networks, the output module comprises a first output network and a second output network, each primary input switch network is connected to the primary of each transformer network and directly connected in series to both ends of the input power source, the M secondary input switch networks are connected to both ends of the first output network and both ends of the second output network after the secondary of the N transformer networks are connected in series, at least one voltage-sharing control network is connected between at least one secondary input switch network and the first output network and the second output network, the high-low voltage switching module is connected between the first output network and the second output network, wherein both N and M are positive integers greater than or equal to 2.
Implement the utility model discloses a two-way DC converter of wide range constant power, through setting up high low pressure mode switching network, can realize wide range voltage constant power input/output, furtherly, through the transformer former limit direct series connection, vice limit connection of crossing establishing ties, can realize topological structure's natural flow equalizing, furthermore, can solve the serious unbalanced problem of voltage that leads to because of device parameter difference through the voltage-sharing control network, and adopt L C resonance voltage-sharing, do not need special logic control, can practice thrift the cost, the reliability of circuit has been improved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a first preferred embodiment of a wide range constant power bidirectional dc converter of the present invention;
fig. 2a-2b show a switching tube full bridge network and a switching tube half bridge network suitable for use in a preferred embodiment of the invention;
3a-l show a preferred transformer network suitable for use in a preferred embodiment of the invention;
figure 4 shows a voltage-sharing control network suitable for use in a preferred embodiment of the present invention;
fig. 5 is a circuit diagram of a second preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 6 is a functional block diagram of a third preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 7 is a circuit diagram of a third preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 8 is a circuit diagram of a fourth preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 9 is a circuit diagram of a fifth preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 10 is a circuit diagram of a sixth preferred embodiment of the wide range constant power bidirectional dc converter of the present invention;
fig. 11 is a circuit diagram of a seventh preferred embodiment of the wide range constant power bidirectional dc converter of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and 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 utility model relates to a two-way direct current converter of wide range constant power, include: the transformer comprises a primary side input switch module, a transformer module, a secondary side output switch module, a voltage-sharing control network, an output module and a high-low voltage mode switching network which are sequentially connected, wherein the transformer module comprises a first transformer network and a second transformer network; the first primary side input switch network is connected between an input power supply and the primary side of a first transformer network, the second primary side input switch network is connected between the input power supply and the primary side of a second transformer network, the first secondary side output switch network and the second secondary side output switch network are connected between the secondary side of the first transformer network, the secondary side of the second transformer network and the voltage-sharing control network in a cross mode, the first output network and the second output network are connected between the voltage-sharing control network and the high-low voltage mode switching network, and the high-low voltage mode switching network is switched between a first mode and a second mode to be connected in series or in parallel with the first output network and the second output network so that the wide-range constant-power bidirectional direct current converter outputs a first voltage or a second voltage. Implement the utility model discloses a two-way direct current converter of wide range constant power through setting up high low pressure mode switching network, can realize wide range voltage constant power input output.
Fig. 1 is a schematic block diagram of a first preferred embodiment of the wide range constant power bidirectional dc converter of the present invention. As shown in fig. 1, the present invention provides a wide-range constant-power bidirectional dc converter, including: the transformer-based high-voltage and low-voltage switching circuit comprises a primary side input switch module 210, a transformer module 310, a secondary side output switch module 410, a voltage-sharing control network 510, an output module 610 and a high-low voltage mode switching network 710 which are connected in sequence. As shown in fig. 1, the transformer module 310 includes a first transformer network 311 and a second transformer network 312, the primary input switch module 210 includes a first primary input switch network 211 and a second primary input switch network 212, the secondary output switch module 410 includes a first secondary output switch network 411 and a second secondary output switch network 412, and the output module 610 includes a first output network 611 and a second output network 612. The first primary side input switching network 211 is connected between the input power source and the primary side of the first transformer network 311. The second primary side input switching network 212 is connected between the input power source and the primary side of the second transformer network 312. The first secondary output switch network 411 and the second secondary output switch network 412 are cross-connected between the secondary side of the first transformer network 311, the secondary side of the second transformer network 312, and the voltage-sharing control network 510. Said first output network 611 and said second output network 612 are connected between the voltage grading control network 510 and said high and low voltage mode switching network 710. The high-low voltage mode switching network 710 switches between a first mode and a second mode to connect the first output network 611 and the second output network 612 in series or in parallel to cause the wide-range constant-power bidirectional dc converter to output either the first voltage or the second voltage.
In a further preferred embodiment of the present invention, the primary and secondary sides of each transformer may be connected to a capacitance-inductance network, such as L C network, LL C, C LL C network, FIGS. 3a-l show a preferred transformer network suitable for use in a preferred embodiment of the present invention.
In the preferred embodiment of the present invention, the first primary side input switch network 211, the second primary side input switch network 212, the first secondary side output switch network 411 and the second secondary side output switch network 412 may adopt the same or different switch tube full-bridge network or switch tube half-bridge network. The utility model discloses a switching tube full-bridge network, switching tube half-bridge network of any form and structure can all be applicable to the utility model discloses. Fig. 2a-2b show a switching tube full bridge network and a switching tube half bridge network suitable for use in a preferred embodiment of the invention.
Preferably, the primary sides of the transformers of the first transformer network 311 and the second transformer network 312 are directly connected in series, and the secondary sides are connected in series in a crossing manner. Two input terminals of the first secondary output switch network 411 may be respectively connected to the first transformer network 311 and the second transformer network 312. Likewise, two input terminals of the second secondary output switching network 412 may be connected to the first transformer network 311 and the second transformer network 312, respectively. The output of said first secondary output switching network 411 is cross-connected to a second output network 612 via a voltage-sharing control network and the output of said second secondary output switching network 412 is cross-connected to the first output network 611 via a voltage-sharing control network.
In the preferred embodiment of the present invention, the voltage-sharing control network 510 can include two voltage-sharing control branches, each of which includes at least one L C resonant cell and at least one diode voltage-dividing cell, by connecting the L C resonant cell in one voltage-sharing control branch to the diode voltage-dividing cell in the other voltage-sharing control branch, the problem of severe voltage imbalance in the device due to parameter differences can be solved.
Preferably, the high-low voltage mode switching network 710 may adopt any hardware switch, soft switch module, or combination of hardware and software, and the high-low voltage mode switching network 710 may be controlled to switch between the first mode and the second mode to connect the first output network 611 and the second output network 612 in series or in parallel so that the wide-range constant-power bidirectional dc converter outputs the first voltage or the second voltage. Preferably, the first voltage is a high voltage. The second voltage is a low voltage. Preferably, the high-low voltage mode switching network 710 may include a first switch and a second switch. A first end of the first switch is connected to a first end of the first output network 611, a second end of the first switch is connected to a first end of the second output network 612, a first end of the second switch is connected to a second end of the first output network 611, a second end of the second switch is connected to a first end of the first output network 611, a third end of the second switch is connected to a first end of the second output network 612, and a fourth end of the second switch is connected to a second end of the second output network 612. The second end of the first output network 611 is an output anode of the wide-range constant-power bidirectional dc converter, and the second end of the second output network 612 is an output cathode of the wide-range constant-power bidirectional dc converter. When the first switch is turned on and the second switch is turned off, the first output network 611 and the second output network 612 are connected in series, and when the first switch is turned off and the second switch is turned off, the first output network 611 and the second output network 612 are connected in parallel. In the wide-range constant-power bidirectional dc converter of the present invention, the first switch and the second switch are air switches, power switch tubes, relays, or contactors.
Implement the utility model discloses a two-way DC converter of wide range constant power, through setting up high low pressure mode switching network, can realize wide range voltage constant power input/output, furtherly, through the transformer former limit direct series connection, vice limit connection of crossing establishing ties, can realize topological structure's natural flow equalizing, furthermore, can solve the serious unbalanced problem of voltage that leads to because of device parameter difference through the voltage-sharing control network, and adopt L C resonance voltage-sharing, do not need special logic control, can practice thrift the cost, the reliability of circuit has been improved.
Fig. 5 is a circuit original diagram of a second preferred embodiment of the wide-range constant-power bidirectional dc converter of the present invention, as shown in fig. 5, the wide-range constant-power bidirectional dc converter of the present invention includes a first primary input switch network formed by a switch tube full-bridge network Sa1-Sa4, a second primary input switch network formed by a switch tube full-bridge network Sa5-Sa8, a first transformer network formed by a transformer Ta1-Ta2, a second transformer network formed by a transformer Ta3-Ta4, a first secondary output switch network formed by a switch tube full-bridge network Sc1-Sc4, a second secondary output switch network formed by a switch tube full-bridge network Sc5-Sc8, and a single output switch network formed by two L C resonant units and two diode voltage-dividing unitsTwo voltage-sharing control branches 511 and 512 and output filter capacitor C formed by elementsO1And CO2A first output network and a second output network which are respectively formed, and a high-low voltage mode switching network formed by the first change-over switch K1 and the second change-over switch K2. In the preferred embodiment shown in fig. 5, a capacitor Cr is connected between the first primary-side input switch network and the first transformer network, and between the second primary-side input switch network and the second transformer network, respectivelyn1、Crn2Inductor L rn1、Lrn2And an input filter capacitor Ci is arranged between the input power supply and the first primary side input switch network and the second primary side input switch network.
As shown in fig. 5, the input ends of the switching tube full-bridge networks Sa1-Sa4 and Sa5-Sa8 are respectively connected to two ends of an input power supply, and the output ends are respectively connected to the primary sides of transformers Ta1, Ta2, Ta3 and Ta4 connected through an L C resonant network, the primary sides of the transformers Ta1 and Ta2 and the primary sides of the transformers Ta3 and Ta4 are directly connected in series, in the embodiment shown in fig. 5, the filter capacitor Ci, the switching tube full-bridge networks Sa1-Sa4 and the switching tube full-bridge networks Sa5-Sa8 are respectively connected to two ends of the input power supply, in a similar embodiment shown in fig. 11, two input filter capacitors Ci1 and Ci2 connected in series may be provided between the input power supply and the first primary side input switching network and the second primary side input switching network, so that the switching tube full-bridge networks Sa1-Sa4 may be connected to two ends of the input filter capacitor Ci1, and the switching tube full-bridge networks Sa5-Sa8 may be connected to.
The secondary sides of the transformers Ta1 and Ta2, the secondary sides of the transformers Ta3 and Ta4 are connected in series and crossed with each other, the switching tube full-bridge networks Sc1-Sc4 and the switching tube full-bridge networks Sc5-Sc8 are connected in series and crossed with the secondary sides of the transformers Ta1 and Ta2 and the secondary sides of the transformers Ta3 and Ta4, as shown in fig. 5, a L C resonant network can be arranged on the secondary sides of the transformers Ta1, Ta2, Ta3 and Ta4, as shown in fig. 5, in the present embodiment, the voltage-sharing control network comprises a first voltage-sharing control branch 511 and a second voltage-sharing control branch 512, the first voltage-sharing control branch 511 comprises two L C resonant cells and two diode voltage-dividing units, the two diode voltage-dividing units are respectively connected to the two ends of the second output network 612, one end of each L C resonant unit is connected to the first end and the second end of the first secondary output switching network 411, the other end of each voltage-sharing control branch is connected to the voltage-dividing point of the corresponding diode-dividing unit, the second voltage-dividing diode-dividing unit is connected to the second secondary side output network 611, and the other end of each diode-dividing unit of the second secondary side-dividing diode-dividing unit is connected to the second secondary side of the second secondary switching network L.
The first end of the first change-over switch K1 is connected with the output filter capacitor CO1The negative electrode and the second end of the capacitor are connected with the output filter capacitor CO2The second change-over switch K2 is a double-ended switch, and the first end of the second change-over switch is connected with the output filter capacitor CO1The anode and the second end of the capacitor are connected with the output filter capacitor CO1The negative electrode and the third end of the capacitor are connected with the output filter capacitor CO2The positive electrode and the fourth end of the capacitor are connected with the output filter capacitor CO2The negative pole of (1), the output filter capacitor CO2The positive electrode of the wide-range constant-power bidirectional direct-current converter is the output positive electrode of the wide-range constant-power bidirectional direct-current converter, and the output filter capacitor CO2The negative pole of the wide-range constant-power bidirectional direct-current converter is the output negative pole of the wide-range constant-power bidirectional direct-current converter.
Preferably, the first switch K1 and the second switch K2 may be air switches, power switch tubes, relays, contactors, and the like, which may be turned on or off. When the first switch K1 is closed and the second switch K2 is opened, the output filter capacitor CO1And said output filter capacitor CO2In series connection, the wide-range constant-power bidirectional direct-current converter works in a high-voltage mode and outputs high voltage, and if the first switch K1 is opened and the second switch K2 is closed, the output filter capacitor CO1And said output filter capacitor CO2And if the two-way direct current converter is connected in parallel, the wide-range constant-power two-way direct current converter works in a low-voltage mode and outputs low voltage.
The ultra-wide range constant power charging and discharging of 1000V-250V high and low voltage can be realized by controlling the first change-over switch K1 and the second change-over switch K2, natural current sharing of a topological structure can be realized by a connection mode that the primary side of the transformer network 310 is directly connected in series and the secondary side of the transformer network is connected in series in a crossed manner, the problem of serious imbalance of voltage caused by parameter difference of devices can be solved by the voltage-sharing control network 510, namely the L C resonance branch is connected to the diode series voltage-sharing branch in the other branch in a crossed manner, meanwhile, the L C resonance branch in the voltage-sharing control network does not need to be controlled by special logic, cost can be saved, and reliability of a circuit can be improved.
Fig. 6 is a schematic block diagram of a third preferred embodiment of the wide range constant power bidirectional dc converter of the present invention. As shown in fig. 6, in this embodiment, the wide-range constant-power bidirectional dc converter includes: the transformer-based high-voltage and low-voltage power supply comprises an input power supply network 100, an input filtering module 110, a primary side input switch module 210, a transformer module 310, a secondary side output switch module 410, a voltage-sharing control network 510, an output module 610, a high-voltage and low-voltage mode switching network 710 and an output power supply network 800 which are connected in sequence. As shown in fig. 6, the transformer module 310 includes a first-fourth transformer network 311-314, the primary input switch module 210 includes a first-fourth primary input switch network 211-214, the secondary output switch module 410 includes a first-fourth secondary output switch network 411-414, and the output module 610 includes a first-fourth output network 611-614. The voltage-sharing control network 510 includes a first voltage-sharing control unit 511 and a second voltage-sharing control unit 512. As shown in fig. 6, the primary sides of the first transformer network 311, the second transformer network 312, the third transformer network 313 and the fourth transformer network 314 are respectively connected in series, and then are respectively connected to the first primary side input switch network 211, the second primary side output switch network 212, the third primary side input switch network 213 and the fourth primary side output switch network 214; the first transformer network 311 is connected in series with the secondary side of the second transformer network 312 in a crossing manner, and is connected to the first secondary side output switch network 411 and the second secondary side output switch network 412 respectively, and the secondary sides of the third transformer network 313 and the fourth transformer network 314 are connected in series in a crossing manner, and are connected to the third secondary side output switch network 413 and the fourth secondary side output switch network 414 respectively; the output end of the first secondary output switch network 411 is connected in parallel with the output end of the third secondary output switch network 413; the output of the second secondary output switching network 412 is connected in parallel with the output of the second secondary four-output switching network 414. Thus, the first secondary output switch network 411 and the third secondary output switch network 413 are connected in parallel across the first output network 611, and the second secondary output switch network 412 and the fourth secondary output switch network 414 are connected in parallel across the second output network 612. And the high and low voltage mode switching network 710 is disposed between the first output network 611 and the second output network 612. The high-low voltage mode switching network 710 thus switches between the first mode and the second mode to connect the first output network 611 and the second output network 612 in series or in parallel to cause the wide-range constant-power bidirectional dc converter to output either the first voltage or the second voltage.
As known to those skilled in the art, the transformer network, the primary input switch network, the secondary output switch network, the voltage-sharing control network, the high-low voltage mode switching network, and the output network described in this embodiment can be configured as shown in fig. 1 to 5, and will not be described herein again.
Fig. 7 is a circuit diagram of a third preferred embodiment of the wide range constant power bidirectional dc converter of the present invention. In the embodiment shown in fig. 7, the input power network 100 may be any dc input power source, such as a battery power source, a generator power source, and the like. The input filter module 110 includes two series input filter capacitors Ci1 and Ci 2. The primary side input switch module 210 comprises a first primary side input switch network formed by a switch tube full-bridge network Sa1-Sa4, a second primary side input switch network formed by a switch tube full-bridge network Sa5-Sa8, a third primary side input switch network formed by a switch tube full-bridge network Sb1-Sb4 and a fourth primary side input switch network formed by a switch tube full-bridge network Sb5-Sb 8. The transformer module 310 includes a first series-connected primary side transformer Ta1-Ta2The transformer network comprises a transformer network, a second transformer network formed by transformers Ta3-Ta4 with primary sides directly connected in series, a third transformer network formed by transformers Tb1-Tb2 with primary sides directly connected in series, and a fourth transformer network formed by transformers Tb3-Tb4 with primary sides directly connected in series. The secondary sides of the transformers Ta1-Ta2 and the secondary sides of the transformers Ta3-Ta4 are connected in series in a crossing mode, and the secondary sides of the transformers Tb1-Tb2 and the secondary sides of the transformers Tb3-Tb4 are connected in series in a crossing mode. The secondary output switch module 410 comprises a first secondary output switch network formed by a switch tube full-bridge network Sc1-Sc4, a second secondary output switch network formed by a switch tube full-bridge network Sc5-Sc8, a third secondary output switch network formed by a switch tube full-bridge network Sd1-Sd4 and a fourth secondary output switch network formed by a switch tube full-bridge network Sd5-Sd 8. The voltage-sharing control network 510 includes two voltage-sharing control branches. The output module 610 includes an output filter capacitor CO1Formed first output network and output filter capacitor CO2Two voltage-sharing control branches respectively comprise two L C resonance units and two diode voltage-dividing units, and the two diode voltage-dividing units are respectively connected with an output filter capacitor CO1And an output filter capacitor CO2And two resonance branches are respectively connected with the voltage division point of the other diode voltage division unit from the third secondary side output switch network and the fourth secondary side output switch network at two ends. The first end of the first change-over switch K1 is connected with the output filter capacitor CO1The negative electrode and the second end of the capacitor are connected with the output filter capacitor CO2The second change-over switch K2 is a double-ended switch, and the first end of the second change-over switch is connected with the output filter capacitor CO1The anode and the second end of the capacitor are connected with the output filter capacitor CO1The negative electrode and the third end of the capacitor are connected with the output filter capacitor CO2The positive electrode and the fourth end of the capacitor are connected with the output filter capacitor CO2The negative pole of (1), the output filter capacitor CO2And the output filter capacitor CO2Is connected to the output power supply network 800. The output power network 800 may include any power output modules, circuits, and devices, such as output capacitors, inductors, and so forth. The principle of the circuit shown in fig. 7 is the same as that shown in fig. 6, and will not be described again here.
It will be appreciated by those skilled in the art that the transformer module 310 may include a greater number of transformer networks, for example it may include six transformer networks as shown in fig. 8. In other preferred embodiments of the present invention, other numbers of transformer networks may be included, and N transformer networks may be selected here, where N is a positive integer greater than or equal to 2. Correspondingly, the primary input switch module 210 and the secondary output switch module 410 may select the corresponding full-bridge network of switching tubes as well as select different full-bridge networks or half-bridge networks of switching tubes, and the number of the switching tubes may be set corresponding to the transformer network, for example, N primary input switch modules 210 and M secondary output switch modules 410 may be set, where N and M are positive integers greater than or equal to 2, which may be equal to each other or different, and may be set according to a specific circuit. The number of voltage-sharing control legs in the voltage-sharing control network 510 may vary. Further implementation can be seen in the embodiments shown in fig. 8-11. It will be appreciated by those skilled in the art that any of the cell modules shown in fig. 2 a-4 may be used, and combined to form different circuits according to the teachings of the present invention, and such circuits are within the scope of the present invention.
Implement the utility model discloses a two-way DC converter of wide range constant power, through setting up high low pressure mode switching network, can realize wide range voltage constant power input/output, furtherly, through the transformer former limit direct series connection, vice limit connection of crossing establishing ties, can realize topological structure's natural flow equalizing, furthermore, can solve the serious unbalanced problem of voltage that leads to because of device parameter difference through the voltage-sharing control network, and adopt L C resonance voltage-sharing, do not need special logic control, can practice thrift the cost, the reliability of circuit has been improved.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A wide range constant power bidirectional dc converter comprising: the transformer comprises a primary side input switch module, a transformer module, a secondary side output switch module, a voltage-sharing control network, an output module and a high-low voltage mode switching network which are sequentially connected, wherein the transformer module comprises a first transformer network and a second transformer network; the first primary side input switch network is connected between an input power supply and the primary side of a first transformer network, the second primary side input switch network is connected between the input power supply and the primary side of a second transformer network, the first secondary side output switch network and the second secondary side output switch network are connected between the secondary side of the first transformer network, the secondary side of the second transformer network and the voltage-sharing control network in a cross mode, the first output network and the second output network are connected between the voltage-sharing control network and the high-low voltage mode switching network, and the high-low voltage mode switching network is switched between a first mode and a second mode to be connected in series or in parallel with the first output network and the second output network so that the wide-range constant-power bidirectional direct current converter outputs a first voltage or a second voltage.
2. The wide range constant power bidirectional dc converter of claim 1 wherein said high-low voltage mode switching network comprises a first switch and a second switch; the first end of the first switch is connected with the first end of the first output network, the second end of the first switch is connected with the first end of the second output network, the first end of the second switch is connected with the second end of the first output network, the second end of the second switch is connected with the first end of the first output network, the third end of the second switch is connected with the first end of the second output network, the fourth end of the second switch is connected with the second end of the second output network, the second end of the first output network is the output anode of the wide-range constant-power bidirectional direct-current converter, and the second end of the second output network is the output cathode of the wide-range constant-power bidirectional direct-current converter; when the first switch is switched on and the second switch is switched off, the first output network and the second output network are connected in series, and when the first switch is switched off and the second switch is switched off, the first output network and the second output network are connected in parallel.
3. The wide range constant power bidirectional dc converter according to claim 2, wherein said first and second switches are air switches, power switching tubes, relays, or contactors.
4. The wide-range constant-power bidirectional direct-current converter according to any one of claims 1 to 3, wherein the voltage-sharing control network comprises at least a first voltage-sharing control branch and at least a second voltage-sharing control branch, the first voltage-sharing control branch comprises a first L C resonance unit and a first diode voltage-sharing unit, the second voltage-sharing control branch comprises a second L C resonance unit and a second diode voltage-sharing unit, one end of the first L C resonance unit is connected with the first end of the first secondary output switch network, the other end of the first L C resonance unit is connected with the voltage-sharing point of the first diode voltage-sharing unit, the first diode voltage-sharing unit is connected between the first end and the second end of the second output network, one end of the second L C resonance unit is connected with the first end of the second secondary output switch network, the other end of the second diode voltage-sharing unit is connected with the voltage-sharing point of the second diode voltage-sharing unit, and the second diode voltage-sharing unit is connected between the first end and the second end of the first output.
5. The wide-range constant-power bidirectional direct-current converter according to claim 4, wherein the first voltage-sharing control branch further comprises a third L C resonant unit and a third diode voltage-sharing unit, the second voltage-sharing control branch further comprises a fourth L C resonant unit and a fourth diode voltage-sharing unit, one end of the third L C resonant unit is connected to the second end of the first secondary output switch network, the other end of the third L C resonant unit is connected to the voltage-sharing point of the third diode voltage-sharing unit, the third diode voltage-sharing unit is connected between the first end and the second end of the second output network, one end of the fourth L C resonant unit is connected to the second end of the second secondary output switch network, the other end of the fourth diode voltage-sharing unit is connected between the first end and the second end of the first output network.
6. The wide range constant power bidirectional dc converter according to claim 5, wherein the primary sides of the transformers in said first transformer network and said second transformer network are directly connected in series, and the secondary sides of the transformers in said first transformer network and said second transformer network are cross-connected in series.
7. The wide-range constant-power bidirectional DC converter according to claim 6, wherein said first primary-side input switch network, said second primary-side input switch network, said first secondary-side output switch network, and said second secondary-side output switch network comprise a switching-tube full-bridge network and/or a switching-tube half-bridge network, respectively.
8. The wide range constant power bidirectional dc converter of claim 7 further comprising an input filter network disposed between said first transformer network, said second transformer network and an input power source, and an output power source network connected at an output of said high-low voltage mode switching network.
9. The wide range constant power bidirectional dc converter of claim 8 wherein said input filter network includes at least one input filter capacitor and said first and second output networks each include at least one output filter capacitor.
10. The wide range constant power bidirectional dc converter according to claim 1, wherein said transformer module comprises N transformer networks, said primary input switch module comprises N primary input switch networks, said secondary output switch module comprises M secondary output switch networks, said output module comprises a first output network and a second output network, each primary input switch network is connected to the primary side of each transformer network and is also directly connected in series to both ends of the input power source, M secondary input switch networks are connected to both ends of said first output network and both ends of said second output network after the secondary sides of said N transformer networks are connected in series and crossed, respectively, at least one of said voltage-sharing control networks is connected between at least one secondary input switch network and said first output network and said second output network, the high-low voltage switching module is connected between the first output network and the second output network, wherein both N and M are positive integers greater than or equal to 2.
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| CN201922180195.3U CN211127587U (en) | 2019-12-06 | 2019-12-06 | Wide-range constant-power bidirectional direct-current converter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995008A (en) * | 2019-12-06 | 2020-04-10 | 深圳市优优绿能电气有限公司 | Wide-range constant-power bidirectional direct-current converter |
| CN112202344A (en) * | 2020-12-04 | 2021-01-08 | 深圳市优优绿能电气有限公司 | Bidirectional direct-current converter with wide voltage range and adaptive switching function |
| CN112366950A (en) * | 2020-11-02 | 2021-02-12 | 湖南大学 | Electrodeless control series/parallel bidirectional power circuit and control method thereof |
| WO2022142278A1 (en) * | 2020-12-30 | 2022-07-07 | 深圳市优优绿能电气有限公司 | Ultra-wide-range high-power converter circuit |
| CN115912928A (en) * | 2022-11-07 | 2023-04-04 | 深圳市优优绿能股份有限公司 | Device suitable for super-high power |
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2019
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995008A (en) * | 2019-12-06 | 2020-04-10 | 深圳市优优绿能电气有限公司 | Wide-range constant-power bidirectional direct-current converter |
| CN112366950A (en) * | 2020-11-02 | 2021-02-12 | 湖南大学 | Electrodeless control series/parallel bidirectional power circuit and control method thereof |
| CN112202344A (en) * | 2020-12-04 | 2021-01-08 | 深圳市优优绿能电气有限公司 | Bidirectional direct-current converter with wide voltage range and adaptive switching function |
| CN112202344B (en) * | 2020-12-04 | 2021-05-04 | 深圳市优优绿能电气有限公司 | Bidirectional direct-current converter with wide voltage range and adaptive switching function |
| WO2022142278A1 (en) * | 2020-12-30 | 2022-07-07 | 深圳市优优绿能电气有限公司 | Ultra-wide-range high-power converter circuit |
| CN115912928A (en) * | 2022-11-07 | 2023-04-04 | 深圳市优优绿能股份有限公司 | Device suitable for super-high power |
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