TWI771729B - DC voltage conversion device - Google Patents

Abstract

The invention discloses a DC voltage conversion device, which comprises a resonance driving device, at least two first transformers, at least two second transformers, at least two third transformers and a rectifying device. The primary sides of the first transformer are connected in series with each other through the first wire, and are coupled to the resonance driving device through the second wire. The primary sides of the second transformer are connected in series with each other through the third wire, and are coupled to the resonance driving device through the fourth wire. The primary sides of the third transformer are connected in series with each other through the fifth wire, and are coupled to the resonance driving device through the sixth wire. The rectifying device is coupled to the secondary side of the transformer. In the present invention, the primary side of the transformer is connected in series, and the secondary side of the transformer is connected in parallel, so as to reduce the copper loss and improve the manufacturing process of the transformer.

Description

DC voltage conversion device

The present invention relates to a voltage conversion device, and in particular, to a DC voltage conversion device.

A DC-to-DC converter, also known as a DC-DC converter or a DC transformer, is an electrical energy conversion circuit or electromechanical device that can convert a direct current (DC) power source into a direct current (or DC) of different voltages. Approximate DC) power supply. Its power can range from very small (small batteries) to very large (high voltage power conversion). Some DC-DC converters have the same reference point for the output voltage and input voltage, while some DC-DC converters have the output voltage isolated from the input voltage.

FIG. 1 is a schematic circuit diagram of a three-phase DC voltage conversion device in the prior art. As shown in FIG. 1 , the three-phase DC voltage conversion device 1 includes six electronic switches 10 , three transformers 12 , three resonant tanks 14 , six diodes 16 , an input capacitor 18 and an output capacitor 19 . All the electronic switches 10 are evenly divided into three groups, each group is connected in parallel with each other, and the input capacitor 18 is connected in parallel, and is connected to a transformer 12 through a resonant tank 14, wherein the resonant tank 14 is composed of series-connected inductors and capacitors. All the diodes 16 are evenly divided into three groups, each group is connected in parallel with each other, and the output capacitors 19 are connected in parallel, and each group is connected to a transformer 12 . Assuming that the design specification is an input DC voltage of 800 volts, an output DC voltage of 100 volts, an output DC current of 200 amps, and an output power of 20 kWh, three transformers with a sufficiently high output voltage are required, but such transformers are relatively large. , unfavorable layout, and inconvenient wiring, high copper resistance. In addition, the rms value of the current on the secondary side of the transformer 12 is 130 amps. If the secondary side current is 6 amps/mm2, it is necessary to use a Li branch wire composed of 2,600 windings with a wire diameter of 0.1 mm, but This lee branch is not easy to make.

Therefore, the present invention is aimed at solving the above-mentioned problems, and proposes a DC voltage conversion device to solve the problems caused by the prior art.

The present invention provides a DC voltage conversion device, which has favorable layout, easy heat treatment and fabrication of branch lines, reduction of copper loss, and uniform output of low current and high current under the same high power.

The invention provides a DC voltage conversion device, which comprises a resonance driving device, at least two first transformers, at least two second transformers, at least two third transformers, a rectifying device and an output capacitor. The primary sides of the first transformers are connected in series with each other through at least one first wire. All the primary sides of the series connected to the first transformers have a first input end and a second input end. The first input end is coupled to the resonant driving device through the second wire. The secondary side of a first transformer has a first output terminal and a second output terminal. The primary sides of the second transformers are connected in series with each other through at least one third wire. The primary sides of all the second transformers in series have a third input terminal and a fourth input terminal. The third input terminal is coupled to the resonant driving device through the fourth wire. The secondary side of a second transformer has a third output terminal and a fourth output terminal. The primary sides of the third transformers are connected in series with each other through at least one fifth wire. The primary sides of all the third transformers in series have a fifth input terminal and a sixth input terminal. The fifth input terminal is coupled to the resonant driving device through a sixth wire. The secondary side of a third transformer has a fifth output end and a sixth output end, the second input end, the fourth input end and the sixth input end are coupled to each other, the second output end, the fourth output end and the sixth output end The ends are coupled to each other. The rectifying device is coupled to the first output end, the third output end and the fifth output end.

In an embodiment of the present invention, the total length of the first wire and the second wire, the total length of the third wire and the fourth wire, and the total length of the fifth wire and the sixth wire are all equal.

In an embodiment of the present invention, the rectifying device is respectively coupled to the first output end of the first transformer through at least two seventh wires, and is respectively coupled to the third output end of the second transformer through at least two eighth wires, and At least two ninth wires are respectively coupled to the third transformer At the fifth output end, the total length of the seventh wire, the total length of the eighth wire and the total length of the ninth wire are all equal.

In one embodiment of the present invention, the rectifying device includes two first diodes connected in series with each other, two second diodes connected in series with each other, two third diodes connected in series with each other, and two diodes connected in series with each other A fourth diode, two fifth diodes connected in series with each other, and two sixth diodes connected in series with each other. The node between the two first diodes and the node between the two second diodes are respectively coupled to the first output ends of the two first transformers. The node between the two third diodes and the node between the two fourth diodes are respectively coupled to the third output terminals of the two second transformers. The node between the two fifth diodes and the node between the two sixth diodes are respectively coupled to the fifth output terminals of the two third transformers. All first diodes in series are connected in parallel with all second diodes in series, all third diodes in series, all fourth diodes in series, all fifth diodes in series and all sixth diodes in series diode.

In an embodiment of the present invention, the resonance driving device includes a current switching device and a resonance circuit. The resonance circuit is coupled to the current switching device, the second wire, the fourth wire and the sixth wire.

In one embodiment of the present invention, the current switching device includes two first electronic switches connected in series with each other, two second electronic switches connected in series with each other, and two third electronic switches connected in series with each other. The node between the two first electronic switches is coupled to the resonance circuit, the node between the two second electronic switches is coupled to the resonance circuit, the node between the two third electronic switches is coupled to the resonance circuit, and An electronic switch is connected in parallel with all the second electronic switches in series, and all the third electronic switches in series are connected in parallel.

In an embodiment of the present invention, the first electronic switch, the second electronic switch and the third electronic switch are all N-channel MOSFETs.

In an embodiment of the present invention, the resonant circuit includes a first resonant tank, a first Two resonance slots and a third resonance slot. The first resonance slot is coupled between the second wire and the current switching device, the second resonance slot is coupled between the fourth wire and the current switching device, and the third resonance slot is coupled between the sixth wire and the current switching device .

In an embodiment of the present invention, the first resonant tank, the second resonant tank and the third resonant tank are all formed of an inductor and a capacitor in series.

In an embodiment of the present invention, the total number of the first transformer, the second transformer and the third transformer after summing up is N times 3, where N is a positive integer greater than or equal to 2.

Based on the above, the DC voltage conversion device is connected in series with the primary side of the transformer and connected in parallel with the secondary side of the transformer to facilitate layout, facilitate heat treatment and fabrication of branch lines, reduce copper losses, and achieve uniformity between low current and high current under the same high power. output.

Hereby, in order to make your examiners have a further understanding and understanding of the structural features of the present invention and the effect achieved, I would like to supplement the preferred embodiment drawings and cooperate with detailed descriptions, and the descriptions are as follows:

1: Three-phase DC voltage conversion device

10: Electronic switch

12: Transformer

14: Resonant tank

16: Diode

18: Input capacitance

19: output capacitor

2: DC voltage conversion device

21: Resonant drive device

211: Current switching device

2111: The first electronic switch

2112: Second electronic switch

2113: The third electronic switch

212: Resonant Circuit

2121: The first resonance tank

2122: Second resonance tank

2123: Third resonance tank

22: First Transformer

221: First wire

222: Second wire

223: Seventh Wire

23: Second Transformer

231: Third wire

232: Fourth wire

233: Eighth Wire

24: Third Transformer

241: Fifth wire

242: Sixth Wire

243: Ninth Lead

25: Rectifier

251: First diode

252: Second Diode

253: Third Diode

254: Fourth Diode

255: Fifth Diode

256: Sixth Diode

26: Output capacitor

I1: The first input terminal

I2: The second input terminal

O1: The first output terminal

O2: The second output terminal

I3: The third input terminal

I4: Fourth input terminal

O3: The third output terminal

O4: Fourth output terminal

I5: Fifth input terminal

I6: sixth input terminal

O5: Fifth output terminal

O6: sixth output terminal

N1: Node

N2: Node

N3: Node

N1': Node

N2': Node

N3': Node

N4': Node

N5': Node

N6': Node

FIG. 1 is a schematic circuit diagram of a three-phase DC voltage conversion device in the prior art.

FIG. 2 is a schematic circuit diagram of the first embodiment of the DC voltage conversion device of the present invention.

FIG. 3 is a schematic circuit diagram of a second embodiment of the DC voltage conversion device of the present invention.

Embodiments of the present invention will be further explained with the help of the related drawings below. Wherever possible, in the drawings and the description, the same reference numbers refer to the same or similar components. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It should be understood that elements not specifically shown in the drawings or described in the specification are known to those of ordinary skill in the art form. Those skilled in the art can make various changes and modifications based on the content of the present invention.

When an element is referred to as being "on", it can generally mean that the element is directly on the other element or that the other element is present in both. Conversely, when an element is said to be "directly on" another element, it cannot have the other element intervening. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

The following description of "one embodiment" or "an embodiment" refers to a particular element, structure or feature associated with at least one embodiment. Thus, the appearances of "one embodiment" or "an embodiment" in various places below are not directed to the same embodiment. Furthermore, the specific components, structures and features in one or more embodiments may be combined in a suitable manner.

FIG. 2 is a schematic circuit diagram of the first embodiment of the DC voltage conversion device of the present invention. Please refer to FIG. 2 below, and introduce the first embodiment of the DC voltage conversion device of the present invention. The DC voltage conversion device 2 includes a resonant driving device 21 , at least two first transformers 22 , at least two second transformers 23 , at least two third transformers 24 , a rectifying device 25 and an output capacitor 26 . The primary sides of the first transformers 22 are connected in series with each other through at least one first wire 221 , and the primary sides of all the first transformers 22 in series have a first input end I1 and a second input end I2 , and the first input end I1 passes through the second wire 222 Coupled to the resonance driving device 21 , the secondary side of each first transformer 22 has a first output terminal O1 and a second output terminal O2 . The first output terminals O1 of all the first transformers 22 are respectively coupled to the rectifying device 25 through at least two seventh wires 223 . The primary sides of the second transformers 23 are connected in series with each other through at least one third wire 231 . The primary sides of all the second transformers 23 in series have a third input terminal I3 and a fourth input terminal I4 , and the third input terminal I3 is connected through the fourth wire 232 Coupled to the resonance driving device 21 , the secondary side of each second transformer 23 has a third output terminal O3 and a fourth output terminal O4 . The third output terminals O3 of all the second transformers 23 are respectively coupled to the rectifying device 25 through at least two eighth wires 233 . The primary sides of the third transformers 24 are connected in series with each other through at least one fifth wire 241, and all the third transformers 24 in series are connected in series. The primary side has a fifth input terminal I5 and a sixth input terminal I6, the fifth input terminal I5 is coupled to the resonant driving device 21 through a sixth wire 242, and the secondary side of each third transformer 24 has a fifth output terminal O5 and a first Six output terminals O6. The fifth output terminals O5 of all the third transformers 24 are respectively coupled to the rectifying device 25 through at least two ninth wires 243 . The second input terminal I2, the fourth input terminal I4 and the sixth input terminal I6 are coupled to each other, and the second output terminal O2, the fourth output terminal O4 and the sixth output terminal O6 are coupled to each other. The rectifying device 25 is coupled to the first output terminal O1 , the third output terminal O3 and the fifth output terminal O5 , and the output capacitor 26 is connected in parallel with the rectifying device 25 .

For the sake of convenience and clarity, the number of the first transformer 22 , the second transformer 23 and the third transformer 24 is all two, and the number of the first wire 221 , the third wire 231 and the fifth wire 241 is all one. The total number of the first transformers 22 , the second transformers 23 and the third transformers 24 is N times 3, where N is a positive integer greater than or equal to 2. The total number of the first transformers 22 is equal to the total number of the second transformers 23 , which is also equal to the total number of the third transformers 24 . When the number of the first transformer 22 , the second transformer 23 and the third transformer 24 increases, the number of the seventh conductor 223 , the eighth conductor 233 and the ninth conductor 243 also increases correspondingly. Compared with the structure shown in Figure 1, there are at least six transformers, which can effectively reduce the volume of a single component, and the layout can be more flexible and heat treatment easier. In addition, the primary side of the transformer is connected in series, and the number of turns can be reduced to reduce copper losses. The secondary side of the transformer is in parallel mode, so the rms value of the current on the secondary side can be reduced to 65 amperes. If the current density on the secondary side is 6 amps/mm2, it is easy to make a Li branch wire composed of 1300 wires with a wire diameter of 0.1 mm. Since the primary side of the transformer is connected in series and the secondary side is connected in parallel, it can achieve uniform output of low current and high current under the same high power. Ampere output specification.

In some embodiments of the present invention, the total length of the first wire 221 and the second wire 222, the total length of the third wire 231 and the fourth wire 232, and the fifth wire 241 and the sixth wire The overall lengths of the lines 242 are all equal. The total length of the seventh wire 223, the total length of the eighth wire 233, and the total length of the ninth wire 243 are all equal. The resonant driving device 21 receives the DC input voltage Vi, and transmits it to the rectifying device 25 through the first transformer 22 , the second transformer 23 and the third transformer 24 , thereby generating the DC output voltage Vo on the output capacitor 26 . Because in the multi-phase DC voltage conversion device, if the inductance formed by the wires of each phase is too different, it will cause the problem of uneven output current. Therefore, the leakage inductance formed by the wires of each phase is very important. The DC voltage conversion device 2 has at least two transformers corresponding to each phase, which can effectively balance the wire lengths of each phase, so that the leakage inductance values of each phase are consistent, thereby outputting a uniform current.

FIG. 3 is a schematic circuit diagram of a second embodiment of the DC voltage conversion device of the present invention. Please refer to FIG. 3 below, and introduce the second embodiment of the DC voltage conversion device of the present invention. The difference between the first embodiment and the second embodiment lies in the resonance driving device 21 and the rectifying device 25 . In the second embodiment, the resonance driving device 21 may include a current switching device 211 and a resonance circuit 212 . The resonance circuit 212 is coupled to the current switching device 211 , the second wire 222 , the fourth wire 232 and the sixth wire 242 .

The current switching device 211 may include two first electronic switches 2111 connected in series with each other, two second electronic switches 2112 connected in series with each other, and two third electronic switches 2113 connected in series with each other. For example, the first electronic switch 2111 , the second electronic switch 2112 and the third electronic switch 2113 are all N-channel MOSFETs, but the invention is not limited thereto. The node N1 between the two first electronic switches 2111 is coupled to the resonance circuit 212, the node N2 between the two second electronic switches 2112 is coupled to the resonance circuit 212, and the node N3 between the two third electronic switches 2113 is coupled to Resonant circuit 212 . All the first electronic switches 2111 in series are connected in parallel with all the second electronic switches 2112 in series, and all the third electronic switches 2113 in series are connected in parallel. The resonant circuit 212 may include a first resonant slot 2121 , a second resonant slot 2122 and a third resonant slot 2123 . The first resonant slot 2121 is coupled to the node between the second wire 222 and the current switching device 211 Between N1 , the second resonant slot 2122 is coupled between the fourth wire 232 and the node N2 of the current switching device 211 . The third resonance tank 2113 is coupled between the sixth wire 242 and the node N3 of the current switching device. The first resonant slot 2121 , the second resonant slot 2122 and the third resonant slot 2123 are all formed of an inductor and a capacitor in series, but the invention is not limited to this.

The rectifying device 25 may include two first diodes 251 connected in series with each other, two second diodes 252 connected in series with each other, two third diodes 253 connected in series with each other, and two fourth diodes connected in series with each other The body 254, the two fifth diodes 255 connected in series with each other, and the two sixth diodes 256 connected in series with each other. The node N1' between the two first diodes 251 and the node N2' between the two second diodes 252 are coupled to the first output terminals O1 of the two first transformers 22, respectively. The node N3' between the two third diodes 253 and the node N4' between the two fourth diodes 254 are respectively coupled to the third output terminals O3 of the two second transformers 23. The node N5' between the two fifth diodes 255 and the node N6' between the two sixth diodes 256 are respectively coupled to the fifth output terminals O5 of the two third transformers 24. All first diodes 251 in series are connected in parallel with all second diodes 252 in series, all third diodes 253 in series, all fourth diodes 254 in series, all fifth diodes 255 in series, All the sixth diodes 256 are connected in series with the output capacitor 26 . The node N1 ′ is the anode of one of the first diodes 251 and the cathode of the other first diode 251 , and the node N2 ′ is the anode of one of the second diodes 252 and the other of the second diodes 252 . Cathode, node N3' is the anode of one of the third diodes 253 and the cathode of the other third diode 253, node N4' is the anode of one of the fourth diodes 254 and the other fourth diode The cathode of 254, the node N5' is the anode of one of the fifth diodes 255 and the cathode of the other fifth diode 255, the node N6' is the anode of one of the sixth diodes 256 and the other of the sixth diode 256. The cathode of the pole body 256 . Since there are twelve diodes in the second embodiment, compared with the first embodiment, the layout of the diodes is more flexible, and the heat treatment is also easier.

According to the above embodiment, the DC voltage conversion device connects the primary side of the transformer in series and the secondary side of the transformer in parallel, so as to facilitate layout, facilitate heat treatment and fabrication of branch lines, and reduce copper loss To achieve a uniform output of low current and high current at the same high power.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all changes and modifications made in accordance with the shape, structure, feature and spirit described in the scope of the patent application of the present invention are equivalent. , shall be included in the scope of the patent application of the present invention.

2: DC voltage conversion device

21: Resonant drive device

22: First Transformer

221: First wire

222: Second wire

223: Seventh Wire

23: Second Transformer

231: Third wire

232: Fourth wire

233: Eighth Wire

24: Third Transformer

241: Fifth wire

242: Sixth Wire

243: Ninth Lead

25: Rectifier

26: Output capacitor

I1: The first input terminal

I2: The second input terminal

O1: The first output terminal

O2: The second output terminal

I3: The third input terminal

I4: Fourth input terminal

O3: The third output terminal

O4: Fourth output terminal

I5: Fifth input terminal

I6: sixth input terminal

O5: Fifth output terminal

O6: sixth output terminal

Claims (10)

A DC voltage conversion device, comprising: a resonant drive device; at least two first transformers, whose primary sides are connected in series with each other through at least one first wire, the series-connected primary sides of the first transformers have a first input end and a second Two input terminals, the first input terminal is coupled to the resonant driving device through a second wire, the secondary side of each first transformer has a first output terminal and a second output terminal; at least two second transformers, the primary The sides are connected in series with each other through at least one third wire. The primary side of the series connection of the second transformers has a third input terminal and a fourth input terminal. The third input terminal is coupled to the resonant driving device through a fourth wire. Each The secondary side of the second transformer has a third output terminal and a fourth output terminal; the primary sides of at least two third transformers are connected in series with each other through at least one fifth wire, and the series-connected primary sides of the third transformers have a fifth input terminal and a sixth input terminal, the fifth input terminal is coupled to the resonant driving device through a sixth wire, the secondary side of each of the third transformers has a fifth output terminal and a sixth output terminal; the second The input end, the fourth input end and the sixth input end are coupled to each other, the second output end, the fourth output end and the sixth output end are coupled to each other; and a rectifier device is coupled to the first output terminal, the third output terminal and the fifth output terminal. The DC voltage conversion device of claim 1, wherein the total length of the at least one first wire and the second wire, the at least one third wire and the first wire The total length of the four wires and the total lengths of the at least one fifth wire and the sixth wire are all equal. The DC voltage conversion device as claimed in claim 1, wherein the rectifying device is respectively coupled to the first output ends of the at least two first transformers through at least two seventh wires, and is coupled to the first output terminals through at least two eighth wires, respectively The third output ends of at least two second transformers are respectively coupled to the fifth output ends of the at least two third transformers through at least two ninth wires, the total length of the at least two seventh wires, the at least two The total length of the eighth wire and the total length of the at least two ninth wires are equal. The DC voltage conversion device as claimed in claim 1, wherein the rectifying device comprises: two first diodes, which are connected in series with each other; two second diodes, which are connected in series with each other, and the two first diodes are connected in series. The node between the two second diodes and the node between the two second diodes are respectively coupled to the first output ends of the at least two first transformers; two third diodes are connected in series with each other; two fourth The diodes are connected in series with each other, and the node between the two third diodes and the node between the two fourth diodes are respectively coupled to the third output ends of the at least two second transformers; Two fifth diodes, which are connected in series with each other; and two sixth diodes, which are connected in series with each other, the node between the two fifth diodes and the node between the two sixth diodes are respectively coupled to the fifth output ends of the at least two third transformers; wherein the first diodes in series are connected in parallel with the second diodes in series, the third diodes in series, the The fourth in series The diodes, the series-connected fifth diodes, and the series-connected sixth diodes. The DC voltage conversion device of claim 1, wherein the resonant driving device comprises: a current switching device; and a resonant circuit coupled to the current switching device, the second wire, the fourth wire and the sixth wire . The DC voltage conversion device as claimed in claim 5, wherein the current switching device comprises: two first electronic switches connected in series with each other, and a node between the two first electronic switches is coupled to the resonant circuit; two second electronic switches an electronic switch connected in series with each other, the node between the two second electronic switches is coupled to the resonant circuit; and two third electronic switches connected in series with each other, the node between the two third electronic switches is coupled to the resonant circuit ; wherein the first electronic switches connected in series are connected in parallel with the second electronic switches connected in series, and the third electronic switches connected in series are connected in parallel. The DC voltage conversion device as claimed in claim 6, wherein the first electronic switches, the second electronic switches and the third electronic switches are all N-channel MOSFETs. The DC voltage conversion device of claim 5, wherein the resonant circuit comprises: a first resonant slot coupled between the second wire and the current switching device; a second resonant slot coupled to the first resonant slot between four conducting wires and the current switching device; and a third resonant slot coupled between the sixth conducting wire and the current switching device. The DC voltage conversion device as claimed in claim 8, wherein the first resonant tank, the second resonant tank and the third resonant tank are all formed of an inductor and a capacitor in series. The DC voltage conversion device as claimed in claim 1, wherein the total number of the at least two first transformers, the at least two second transformers and the at least two third transformers added together is N times 3, N is a positive integer greater than or equal to 2.

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