Parallel power module converter

Abstract

The utility model relates to the technical field of converters, in particular to a parallel power module converter. Comprising a master power device and a slave power device, the AC side of the master power device and the AC side of the slave power device are respectively connected with an AC voltage, and the DC side of the master power device is connected with the DC side of the slave power device and jointly connected with a DC voltage; the main power device comprises a control board; the first driving board is connected with the control board through the first conversion board; the main power chip is connected with the first driving board; the slave power device comprises a second driving board which is connected with the control board through a second conversion board; and the slave power chip is connected with the second driving board. According to the utility model, the main power device and the slave power device are connected in parallel for output, so that the output capability of the power converter is greatly improved, the rated power of the shore power variable-frequency power supply is increased, and the requirement of a wharf on shore capacitance is met.

Description

Technical Field

[0001] This utility model relates to the field of converter technology, specifically to a parallel power module converter. Background Technology

[0002] The diverse application scenarios of power modules result in varying required capacities. Currently, large ports, especially container terminals and cruise terminals, mostly have high-power shore power needs. However, existing shore power systems have many shortcomings in dealing with high-capacity power supply demands. Existing shore power systems often use parallel technology to increase power supply capacity, but this leads to complex system structures, less streamlined component and wiring connections, and unavoidable interference between power sources, resulting in voltage fluctuations and affecting power quality. Utility Model Content

[0003] The purpose of this utility model is to provide a parallel power module converter to solve the above-mentioned technical problems;

[0004] The technical problem solved by this utility model can be achieved by the following technical solution:

[0005] A parallel power module converter, comprising,

[0006] A main power device and a slave power device are provided. The AC side of the main power device and the AC side of the slave power device are each connected to an AC voltage. The DC side of the main power device is connected to the DC side of the slave power device, and they are both connected to a DC voltage.

[0007] The main power device includes,

[0008] The control board can controllably generate control signals;

[0009] A first drive board is connected to the control board via a first conversion board;

[0010] The main power chip is located between the AC side and the DC side of the main power device and is connected to the first driver board.

[0011] The power device includes,

[0012] The second drive board is connected to the control board via the second conversion board;

[0013] The power chip is located between the AC side and the DC side of the power device and is connected to the second driver board.

[0014] Preferably, the main power device further includes an optical fiber expansion board connected to the control board, and the second conversion board is connected to the optical fiber expansion board via an optical fiber to receive the control signal;

[0015] The control board is a digital signal processing control board, and both the first conversion board and the second conversion board are photoelectric conversion boards.

[0016] Preferably, both the main power chip and the slave power chip are IGBT chips, and each IGBT chip is connected in parallel with an absorption capacitor.

[0017] Preferably, the AC side of the main power device includes a main three-phase AC copper busbar connected to the main power chip to transmit the AC voltage, and the AC side of the slave power device includes a slave three-phase AC copper busbar connected to the slave power chip to transmit the AC voltage;

[0018] The DC side of the main power device includes a main DC copper busbar, and the DC side of the slave power device includes a slave DC copper busbar. The positive copper busbar of the main DC busbar is connected to the positive copper busbar of the slave DC busbar, and the negative copper busbar of the main DC busbar is connected to the negative copper busbar of the slave DC busbar.

[0019] Preferably, the DC side of the main power device further includes,

[0020] A first DC support capacitor, the first end of which is connected to the positive copper busbar of the main DC busbar, and the second end of which is connected to the negative copper busbar of the main DC busbar.

[0021] A first discharge resistor, the first end of which is connected to the positive copper busbar of the main DC busbar, and the second end of which is connected to the negative copper busbar of the main DC busbar.

[0022] Preferably, the DC side of the power device further includes,

[0023] The second DC support capacitor has its first terminal connected to the positive copper busbar of the DC busbar and its second terminal connected to the negative copper busbar of the DC busbar.

[0024] The second discharge resistor has its first end connected to the positive copper busbar of the DC busbar and its second end connected to the negative copper busbar of the DC busbar.

[0025] Preferably, it also includes a switching power supply, the output terminal of which is provided with a plurality of terminals, the terminals being connected to the control board, the first conversion board and the second conversion board respectively through diodes, to output a power supply voltage.

[0026] Preferably, the AC side of the main power device is provided with a main current sensor, and the AC side of the slave power device is provided with a slave current sensor. Both the main current sensor and the slave current sensor are connected to the control board.

[0027] Preferably, the power device further includes a high-voltage sampling board, which samples the DC voltage on the DC side of the power device, and the high-voltage sampling board is connected to the control board to output a sampling signal.

[0028] Preferably, the main power device further includes a main power box, in which the main power chip, the control board, the first drive board and the first conversion board are disposed, and a cooling fan for cooling the control board is provided on the top of the main power box, and a first fan for cooling the main power chip is provided on the side of the main power box.

[0029] The power supply device further includes a power supply box, in which the second drive board, the second conversion board and the power chip are disposed. A second fan for heat dissipation of the power chip is provided on the side of the power supply box.

[0030] The beneficial effects of this utility model are as follows: By adopting the above technical solution, this utility model uses a main power device and a slave power device to output in parallel, which greatly improves the output capability of the power converter, increases the rated power of the shore power frequency converter, and meets the dock's demand for shore power capacity. Attached Figure Description

[0031] Figure 1 This is a topology diagram of the parallel power module converter in this embodiment of the present invention;

[0032] Figure 2 This is a circuit diagram of the parallel power module converter in an embodiment of the present invention;

[0033] Figure 3 This is a left view of the main power device in an embodiment of this utility model;

[0034] Figure 4 This is a front view of the main power device in an embodiment of this utility model;

[0035] Figure 5 This is a top view of the main power device in an embodiment of this utility model;

[0036] Figure 6 This is a bottom view of the main power device in an embodiment of this utility model;

[0037] Figure 7 This is a right view of the main power device in an embodiment of this utility model;

[0038] Figure 8 This is a rear view of the main power device in an embodiment of the present invention;

[0039] Figure 9This is a right view of the power device in an embodiment of the present invention;

[0040] Figure 10 This is a front view of the power device in an embodiment of the present invention;

[0041] Figure 11 This is a left view of the power device in an embodiment of the present invention;

[0042] Figure 12 This is a top view of the power device in an embodiment of the present invention;

[0043] Figure 13 This is a bottom view of the power device in an embodiment of the present invention;

[0044] Figure 14 This is a rear view of the power device in an embodiment of the present invention. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0048] A parallel power module converter, such as Figure 1 , Figure 2 As shown, including,

[0049] A main power device 1 and a slave power device 2 are connected to an AC voltage on the AC side of the main power device 1 and the AC side of the slave power device 2 respectively. The DC side of the main power device 1 is connected to the DC side of the slave power device 2, and they are both connected to a DC voltage.

[0050] The main power device 1 includes,

[0051] The control board 11 can controllably generate control signals;

[0052] The first drive board 12 is connected to the control board 11 via the first conversion board 13;

[0053] The main power chip 14 is located between the AC side and the DC side of the main power device 1 and is connected to the first driver board 12;

[0054] The power device 2 includes,

[0055] The second drive board 21 is connected to the control board 11 via the second conversion board 22;

[0056] The power chip 24 is located between the AC side and the DC side of the power device 2 and is connected to the second drive board 21.

[0057] Specifically, the topological structure of this utility model is as follows: Figure 1 As shown, the AC three-phase interfaces UA1, UB1 and UC1 of the main power device 1 and the AC three-phase interfaces UA2, UB2 and UC2 of the slave power device 2 are respectively connected to AC voltages U, V and W. The DC positive interface D1+ of the main power device 1 is connected to the DC positive interface D2+ of the slave power device 2, and the DC negative interface D1- of the main power device 1 is connected to the DC negative interface D2- of the slave power device 2. The DC voltages DC+ and DC- are also connected.

[0058] The parallel power converter provided by this utility model uses two 650A power modules, one of which is the main power device 1 and the other is the slave power device 2. The main power device 1 and the slave power device 2 are connected in parallel and share a control board 11, which increases the rated output current of the power converter, increases the rated capacity, and meets the actual needs.

[0059] The parallel power converter provided by this utility model can rectify AC power from the grid side into DC power through IGBT chips, and can also reverse the DC power to convert it into constant voltage and constant frequency AC power to provide power to other devices.

[0060] Parallel power converters are mainly used in rectification, inversion, DC-DC conversion, and electric drive applications. Both the main power unit 1 and the slave power unit 2 include a DC link, an AC-DC conversion link, an output link, a control link, and a secondary power supply link.

[0061] The DC power inputs of the main power device 1 and the slave power device 2 are used as DC input links. The main power chip and the slave power chip 24 constitute an AC-DC conversion link. The AC side serves as the output link. The control board, the first drive board and the second drive board serve as the control link. The switching power supply 3 serves as the secondary power supply link.

[0062] This utility model adopts a parallel output of main power device 1 and slave power device 2, which greatly improves the output capability of the power module, increases the rated power of the shore power frequency converter, and meets the dock's demand for shore power capacity.

[0063] In a preferred embodiment, such as Figure 3 , Figure 4As shown, the main power device 1 also includes an optical fiber expansion board 16, which is connected to the control board 11. The second conversion board 22 is connected to the optical fiber expansion board 16 via optical fiber and receives control signals.

[0064] The control board 11 is a digital signal processing control board, and the first conversion board 13 and the second conversion board 22 are both photoelectric conversion boards.

[0065] In a preferred embodiment, both the main power chip 14 and the slave power chip 24 are IGBT chips, and each IGBT chip is connected in parallel with a snubber capacitor. Preferably, the snubber capacitor can reduce the impact of voltage spikes on the IGBT chip.

[0066] Specifically, the main power chip 14 of this utility model includes a first IGBT chip T11, a second IGBT chip T12, a third IGBT chip T13, a fourth IGBT chip T14, a fifth IGBT chip T15 and a sixth IGBT chip T16.

[0067] The power chip 24 includes the seventh IGBT chip T21, the eighth IGBT chip T22, the ninth IGBT chip T23, the tenth IGBT chip T24, the eleventh IGBT chip T25, and the twelfth IGBT chip T26.

[0068] The absorption capacitors include a first absorption capacitor C301 connected in parallel with the first IGBT chip T11, a second absorption capacitor C302 connected in parallel with the second IGBT chip T12, a third absorption capacitor C303 connected in parallel with the third IGBT chip T13, a fourth absorption capacitor C304 connected in parallel with the fourth IGBT chip T14, a fifth absorption capacitor C306 connected in parallel with the fifth IGBT chip T15, a sixth absorption capacitor C306 connected in parallel with the sixth IGBT chip T16, a seventh absorption capacitor C307 connected in parallel with the seventh IGBT chip T21, an eighth absorption capacitor C308 connected in parallel with the eighth IGBT chip T22, a ninth absorption capacitor C309 connected in parallel with the ninth IGBT chip T23, a tenth absorption capacitor C310 connected in parallel with the tenth IGBT chip T24, an eleventh absorption capacitor C311 connected in parallel with the eleventh IGBT chip T25, and a twelfth absorption capacitor C312 connected in parallel with the twelfth IGBT chip T26.

[0069] In a preferred embodiment, the AC side of the main power device 1 includes a main three-phase AC copper busbar connected to the main power chip 14 to transmit AC voltage, and the AC side of the slave power device 2 includes a slave three-phase AC copper busbar connected to the slave power chip 24 to transmit AC voltage.

[0070] The DC side of the main power device 1 includes a main DC copper busbar, and the DC side of the slave power device 2 includes a slave DC copper busbar. The positive copper busbar of the main DC busbar is connected to the positive copper busbar of the slave DC busbar, and the negative copper busbar of the main DC busbar is connected to the negative copper busbar of the slave DC busbar.

[0071] In a preferred embodiment, the DC side of the main power device 1 further includes,

[0072] The first DC support capacitor C1 has its first end connected to the positive copper busbar of the main DC busbar, and its second end connected to the negative copper busbar of the main DC busbar.

[0073] The first discharge resistor R1 has its first end connected to the positive copper busbar of the main DC busbar, and its second end connected to the negative copper busbar of the main DC busbar.

[0074] Specifically, such as Figure 3 As shown, the first DC support capacitor C1 of this invention includes nine thin-film cylindrical capacitors connected in series, which are respectively disposed on the upper part of the main power box 15 to suppress DC voltage fluctuations.

[0075] In a preferred embodiment, the power device 2 also includes, from the DC side,

[0076] The second DC support capacitor C2 has its first terminal connected to the positive copper busbar of the DC busbar and its second terminal connected to the negative copper busbar of the DC busbar.

[0077] The second discharge resistor R2 has its first end connected to the positive copper busbar of the DC busbar and its second end connected to the negative copper busbar of the DC busbar.

[0078] Specifically, such as Figure 9 As shown, the second DC support capacitor C2 of this utility model includes nine thin-film cylindrical capacitors connected in series, which are respectively disposed on the upper part of the power box 25 to suppress DC voltage fluctuations.

[0079] In a preferred embodiment, the system further includes a switching power supply 3. The output terminal of the switching power supply 3 is provided with a plurality of terminals 33. The terminals 33 are connected to the control board 11, the first conversion board 13 and the second conversion board 22 respectively through diodes 34, and output power supply voltage.

[0080] Specifically, such as Figure 4As shown, since the control board 11 and the first conversion board 13 require different power supply voltages, the switching power supply 3 in the main power box 15 includes a first switching power supply 31 and a second switching power supply 32, which are used to output two power supply voltages, 24V and 15V, to provide DC power to the control board 11 and the first conversion board 13 respectively. A voltage is output from the switching power supply 3 in the power box 25 to power the high voltage sampling board 23 and the second conversion board 22. The diode 34 provides protection for the power supply circuit to prevent voltage backflow.

[0081] More specifically, such as Figure 7 As shown, the main power box 15 is also equipped with a high-voltage side power supply device 4 on the side of the box. After the AC side of the main power box 15 is powered, the high-voltage side power supply device 4 is used to supply power to the control board 11, the first conversion board 13, the second conversion board 22, the main current sensor A1, the slave current sensor A2, and the high-voltage sampling board 23. This is to cooperate redundantly with the switching power supply 3, so that the control board 11, the first conversion board 13, the second conversion board 22, the main current sensor A1, the slave current sensor A2, and the high-voltage sampling board 23 can work normally regardless of whether the AC side of the main power box 15 is powered or not.

[0082] In a preferred embodiment, the AC side of the main power device 1 is provided with a main current sensor A1, and the AC side of the slave power device 2 is provided with a slave current sensor A2. Both the main current sensor A1 and the slave current sensor A2 are connected to the control board 11.

[0083] Specifically, the main current sensor A1 is used to sample the AC side current of the main power device 1. The main current sensor A1 includes a first current sensor A11 disposed on the first phase of the AC side of the main power device 1, a first current sensor A12 disposed on the second phase of the AC side of the main power device 1, and a third current sensor A13 disposed on the third phase of the AC side of the main power device 1.

[0084] The current sensor A2 is used to sample the AC side current of the power device 2. The current sensor A2 includes a fourth current sensor A21 disposed on the first phase of the AC side of the power device 2, a fifth current sensor A22 disposed on the second phase of the AC side of the power device 2, and a sixth current sensor A23 disposed on the third phase of the AC side of the power device 2.

[0085] In a preferred embodiment, the power device 2 further includes a high-voltage sampling board 23, which samples the DC voltage from the DC side of the power device 2. The high-voltage sampling board 23 is connected to the control board 11 to output a sampling signal.

[0086] In a preferred embodiment, such as Figures 3 to 14As shown, the main power device 1 also includes a main power box 15. The main power chip 14, control board 11, first drive board 12, and first conversion board 13 are disposed inside the main power box 15. The top of the main power box 15 is provided with a cooling fan 17 for heat dissipation of the control board 11. Figure 7 As shown, the main power box 15 has a first fan 18 on the side of the box for heat dissipation of the main power chip 14;

[0087] The power device 2 also includes a power box 25, and the second drive board 21, the second conversion board 22, and the power chip 24 are disposed in the power box 25. Figure 11 As shown, a second fan 26 for dissipating heat from the power chip 24 is provided on the side of the power box 25.

[0088] Specifically, the housing portions of the main power box 15 and the slave power box 25 serve as the grounding terminals PE for the main power device 1 and the slave power device 2, respectively.

[0089] like Figure 6 , Figure 13 As shown, the bottom of the main power box 15 is provided with a reserved interface 191 and a reserved network port 192, and the bottom of the power box 25 is provided with a copper cable outlet 27 on the AC side for outputting AC voltage.

[0090] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A parallel power module converter, characterized in that, include, A main power device (1) and a slave power device (2) are provided. The AC side of the main power device (1) and the AC side of the slave power device (2) are respectively connected to an AC voltage. The DC side of the main power device (1) is connected to the DC side of the slave power device (2) and they are connected to a DC voltage. The main power device (1) includes, The control board (11) can controllably generate control signals; The first drive board (12) is connected to the control board (11) via the first conversion board (13); The main power chip (14) is located between the AC side and the DC side of the main power device (1) and is connected to the first drive board (12). The power device (2) includes, The second drive board (21) is connected to the control board (11) via the second conversion board (22); The power chip (24) is located between the AC side and the DC side of the power device (2) and connected to the second drive board (21).

2. The parallel power module converter according to claim 1, characterized in that, The main power device (1) also includes an optical fiber expansion board (16) connected to the control board (11), and the second conversion board (22) is connected to the optical fiber expansion board (16) via optical fiber and receives the control signal; The control board (11) is a digital signal processing control board, and the first conversion board (13) and the second conversion board (22) are both photoelectric conversion boards.

3. The parallel power module converter according to claim 1, characterized in that, Both the main power chip (14) and the slave power chip (24) are IGBT chips, and each IGBT chip is connected in parallel with an absorption capacitor.

4. The parallel power module converter according to claim 1, characterized in that, The AC side of the main power device (1) includes a main three-phase AC copper busbar, which is connected to the main power chip (14) to transmit the AC voltage. The AC side of the slave power device (2) includes a slave three-phase AC copper busbar, which is connected to the slave power chip (24) to transmit the AC voltage. The DC side of the main power device (1) includes a main DC copper busbar, and the DC side of the slave power device (2) includes a slave DC copper busbar. The positive copper busbar of the main DC busbar is connected to the positive copper busbar of the slave DC busbar, and the negative copper busbar of the main DC busbar is connected to the negative copper busbar of the slave DC busbar.

5. The parallel power module converter according to claim 4, characterized in that, The DC side of the main power device (1) also includes, A first DC support capacitor (C1) is connected at its first end to the positive copper busbar of the main DC busbar, and at its second end to the negative copper busbar of the main DC busbar. The first discharge resistor (R1) has its first end connected to the positive copper busbar of the main DC busbar, and its second end connected to the negative copper busbar of the main DC busbar.

6. The parallel power module converter according to claim 4, characterized in that, The DC side of the power device (2) also includes, The second DC support capacitor (C2) has its first terminal connected to the positive copper busbar of the DC busbar and its second terminal connected to the negative copper busbar of the DC busbar. The second discharge resistor (R2) has its first end connected to the positive copper busbar of the DC busbar and its second end connected to the negative copper busbar of the DC busbar.

7. The parallel power module converter according to claim 1, characterized in that, It also includes a switching power supply (3), the output end of which is provided with several terminals (33), the terminals (33) are respectively connected to the control board (11), the first conversion board (13) and the second conversion board (22) through diodes (34) to output the power supply voltage.

8. The parallel power module converter according to claim 1, characterized in that, The main power device (1) is provided with a main current sensor (A1) on the AC side, and the slave power device (2) is provided with a slave current sensor (A2) on the AC side. Both the main current sensor (A1) and the slave current sensor (A2) are connected to the control board (11).

9. The parallel power module converter according to claim 1, characterized in that, The power device (2) also includes a high-voltage sampling board (23), which samples the DC voltage on the DC side of the power device (2), and the high-voltage sampling board (23) is connected to the control board (11) to output a sampling signal.

10. The parallel power module converter according to claim 1, characterized in that, The main power device (1) also includes a main power box (15), the main power chip (14), the control board (11), the first drive board (12) and the first conversion board (13) are disposed in the main power box (15), the top of the main power box (15) is provided with a cooling fan (17) for cooling the control board (11), and the side of the main power box (15) is provided with a first fan (18) for cooling the main power chip (14). The power device (2) further includes a power box (25), the second drive board (21), the second conversion board (22) and the power chip (24) are disposed in the power box (25), and a second fan (26) for heat dissipation of the power chip (24) is provided on the side of the power box (25).

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