TW201347375A - Three-phase rectifier circuit - Google Patents

Abstract

In one aspect of the invention, a three-phase rectifier circuit having three input terminals and two output terminals includes a three-phase diode bridge, three switching circuits, and a voltage source. The three-phase diode bridge has three pairs of first diodes electrically parallel-connected to the two output terminals. Each pair of first diodes has two first diodes series-connected defining a first node therebetween, and electrically connected to a corresponding input terminal at the first node. Each switching circuit has a first terminal, a second terminal and a plurality of switches electrically series-connected between the first and second terminals. The first and second terminals are respectively electrically connected to a second node and a third node, respectively between the first node and the two first diodes of the corresponding pair of first diodes. The voltage source is electrically parallel-connected between the two output terminals and electrically connected to each switching circuit.

Description

Three-phase rectifier circuit

The present invention relates generally to AC/DC converter circuits, and more particularly to a three-phase rectification circuit that rectifies an AC input voltage to a DC voltage using a three-phase power factor correction (PFC) circuit.

An AC/DC converter is an electronic device that converts an alternating current power (AC) signal into a direct current (DC) signal. AC/DC converters are critical to electronic devices (such as computer servers or workstations) that operate with DC voltages using AC power as a power source. In addition, other electronic devices that use both an AC power source and a rechargeable battery as a power source also require an AC/DC converter. For example, portable electronic devices such as mobile phones and laptops can use battery powered DC power when AC power is not available, but can also use AC power as a power source to operate and/or charge the battery. In this case, the AC voltage must be converted to a DC voltage for operation of the portable electronic device or for charging the battery.

Generally, AC/DC converters use power factor correction (PFC) circuits because of the harmonic pollution of the power grid by the power electronics converter. Conventional AC/DC converters use a single phase system that includes a single phase PFC circuit, a high voltage DC link, and a DC/DC converter. The single-phase PFC circuit performs AC/DC conversion, converts the AC voltage from the AC power source into a high voltage DC signal, and transmits the high voltage DC signal to the DC/DC converter through a high voltage DC link. The DC/DC converter then converts the high voltage DC signal to the DC voltage required by the electronic device. However, the output rated power of a single-phase system is limited.

With the increasing demand for high output power of AC/DC converters, three-phase PFC circuits are widely used to perform AC/DC conversion. In actual use, the topology of the three-phase PFC circuit can be a variety of different circuit layouts. On the one hand, it is always preferred to use a circuit layout of a simple three-phase PFC circuit, but a simple circuit layout often causes problems such as relatively low efficiency and high harmonic current. On the other hand, using more complex circuit layouts to increase the efficiency of three-phase PFC circuits will create additional problems, such as increased circuit cost and circuit control complexity, and reduced AC/DC converter reliability.

In addition, the three-phase PFC circuit produces a higher output DC voltage, typically in the 800V range. Thus, when an AC/DC converter uses a three-phase PFC circuit instead of a single-phase PFC circuit, the DC/DC converter needs to be replaced to withstand the higher output DC voltage generated by the three-phase PFC circuit. One way to solve this problem is to use high voltage circuit components (such as 1200V components) in the AC/DC converter instead of 600V components. However, 1200V components are not as commonly used as components of 600, and thus AC/DC converters will cost more due to the increased cost of 1200V components. Another way is to use a more complex circuit layout using a typical 600V component. However, in this manner, the number of circuit components increases and thus becomes more difficult to control.

Therefore, the unresolved needs to date exist in the prior art to solve the above-mentioned drawbacks and deficiencies.

The invention in one aspect relates to a three-phase rectifier circuit having three inputs and two outputs comprising a three-phase diode bridge and three switching circuits. The three-phase diode bridge has three first diode pairs electrically connected in parallel to the two outputs, wherein each first diode pair has two first diodes connected in series, the two first two A first node is defined between the pole tubes, and each first diode pair is electrically connected to the corresponding input terminal at the first node. Each switching circuit has a first end, a second end, and a plurality of switches electrically connected in series between the first end and the second end, and each switching circuit is coupled to a corresponding first diode pair, The first end is electrically connected to a second node between the first diode and the first node of the corresponding first diode pair, and the second end is electrically connected to the second end a third node between the other first diode of the respective first diode pair and the first node. In addition, the three-phase rectifier circuit can have a voltage source electrically connected in parallel between the two outputs and electrically connected to each of the switch circuits. In one embodiment, each of the plurality of switches of the three switching circuits comprises a MOS switch or an IGBT switch.

In addition, the three-phase diode bridge can have three pairs of second diodes, wherein each pair of second diodes has two second diodes, and one second diode is electrically connected to the corresponding first two Between the first node and the second node of the pair of poles, and another second diode are electrically connected between the first node and the third node of the corresponding first diode pair. In one embodiment, all of the first diodes of the three first diode pairs comprise fast recovery diodes, and all of the second diodes of the three second diode pairs comprise slow recovery diodes.

In one embodiment, the voltage source includes two capacitors in series, a fourth node is defined between the two capacitors, and the voltage source is electrically coupled to each of the switching circuits at the fourth node. The capacitor is a polarized capacitor.

Moreover, the three-phase rectifier circuit can include a converter circuit electrically coupled to the two outputs. The converter circuit can also have a plurality of modules, and each module has a first input, a second input, a first output, and a second output. The first input of the first module and the second input of the last module are respectively electrically connected to the two outputs, and the second input of any module other than the last module is electrically connected to the next A first input of a module, and the first output and the second output of the plurality of modules are electrically connected in parallel. In one embodiment, each module has a resonant converter. Additionally, the resonant converter can have an LLC series resonant DC/DC converter or an LLC parallel resonant DC/DC converter.

In another aspect of the invention, a three-phase rectifier circuit having three inputs and two outputs includes a three-phase diode bridge and three switching circuits. In one embodiment, the three-phase rectifier circuit has a PFC circuit having one or more inputs and two outputs electrically coupled to the AC power source, and a voltage source electrically coupled to the two outputs of the PFC. And a plurality of modules interleaved and electrically connected to the voltage source.

In one embodiment, the PFC circuit includes a three-phase diode bridge including three first diode pairs electrically coupled in parallel to two outputs of the PFC circuit, wherein each first diode pair includes two a first diode connected in series, a first node is defined between the two first diodes, and each first diode is electrically connected to the input of the corresponding PFC circuit at the first node; a three switching circuit, each switching circuit having a first end, a second end, and a plurality of switches electrically connected in series between the first end and the second end, and each switching circuit is coupled to the corresponding first a diode pair such that the first end is electrically connected to a second node between a first diode of the corresponding first diode pair and the first node, and the second end is caused Electrically coupled to a third node between the other first diode of the respective first pair of diodes and the first node.

In one embodiment, the voltage source includes one or more capacitors.

In one embodiment, each module has a first input, a second input, a first output, and a second output, wherein the first input of the first module and the second input of the last module are electrically coupled to the PFC circuit The two outputs of any of the modules except the last module are electrically connected to the first input of the next module immediately following, and the first output and the second output of the plurality of modules are both Sexual parallel. In one embodiment, each module includes a resonant converter, wherein the resonant converter includes an LLC series resonant DC/DC converter or an LLC parallel resonant DC/DC converter.

The invention will now be described more fully hereinafter with reference to the accompanying drawings, in which FIG. However, the invention may be embodied in many different forms and is not construed as being limited to the embodiments set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and the scope of the invention is fully disclosed to those of ordinary skill in the art. Similar drawing symbols throughout the text indicate similar elements.

The terminology used herein is for the purpose of describing particular embodiments, The singular forms "a", "the", and "the" It should also be understood that the terms "comprising" and/or "including" or "including" and / or "including" or "having" and / or "having" are used in the specification to be stated. The existence of features, regions, integers, steps, operations, components and/or components without the exclusion of the presence of one or more other features, regions, integers, steps, operations, components, components and/or combinations thereof .

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art It should also be understood that those terms defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings of the related art and the present invention, and are not to be construed as idealized or overly formalized meanings. Unless specifically defined herein.

As used herein, "about", "about" or "approximately" is generally meant to be within 20% of a given value or range, preferably within 10% of a given value or range, more preferably at a given value or Within 5% of the range. The quantities given herein are approximate, meaning that the term "about", "about" or "approximately" can be inferred if not specifically stated.

Embodiments of the present invention will be described in conjunction with the drawings of FIGS. 1 through 5. In accordance with an object of the present invention, as specifically and generally described herein, the present invention relates to a three-phase rectifier circuit in one aspect. In one embodiment, the three-phase rectifier circuit is a three-phase PFC circuit. 1 through 4 illustrate four specific circuits of three-phase rectifier circuits 100, 200, 300, and 400, respectively, in accordance with various embodiments of the present invention. As shown in FIG. 1, three-phase rectifier circuit 100 has three inputs 122, 124, and 126 and two outputs 132 and 134. The three inputs 122, 124, and 126 can be AC inputs and each have an inductance L ₁ , L _{2 ,} or L ₃ . The two outputs 132 and 134 can be DC outputs. Further, the three-phase rectifier circuit 100 has a three-phase diode bridge 110, a voltage source 140, and three switching circuits 150. The three-phase diode bridge 110 shown in Figure 1 is a bridge rectifier, more specifically a three-phase Vienna PFC circuit. Also, the three-phase diode bridge 110 has three pairs of first diode pairs 112, 114, and 116 that are electrically coupled in parallel to the two output terminals 132 and 134.

The first diode pair 112 includes first diodes D ₁ and D ₂ connected in series, the first node D ₁ and D ₂ define a first node N ₁ , and is electrically connected at the first node N ₁ Connected to the corresponding input 122. Similarly, the first diode pair 114 includes first diodes D ₃ and D ₄ connected in series, the first node D ₃ and D ₄ define a first node N ₂ , and at the first node N ₂ Electrically connected to the corresponding input terminal 124. The first diode pair 116 includes first diodes D ₅ and D ₆ connected in series, the first node D ₅ and D ₆ define a first node N ₃ , and is electrically connected at the first node N ₃ Connect to the corresponding input 126. Preferably, all of the diodes D ₁ , D ₂ , D ₃ , D ₄ , D ₅ and D _{6 of the} three first diode pairs 112, 114 and 116 comprise fast recovery diodes.

The three switching circuits 150 include switching circuits 152, 154, and 156. The switch circuit 152 has a first end, a second end, and a plurality of switches Q ₁ and Q ₂ electrically connected in series between the first end and the second end, and coupled to the corresponding first diode pair 112, such that The first end of the switch circuit 152 is electrically connected to the second node N ₁₁ between the first node N ₁ and a first diode D _{1 of the} corresponding first diode pair 112, and the switch circuit is made The second end of the 152 is electrically coupled to the third node N ₁₂ between the first node N ₁ and the other first diode D _{2 of the} corresponding first diode pair 112. Similarly, the switch circuit 154 also has a first end, a second end, and a plurality of switches Q ₃ and Q ₄ electrically connected in series between the first end and the second end, and coupled to the corresponding first diode Pair 114, the first end of the switch circuit 154 is electrically connected to the second node N ₂₁ between the first node N ₂ and a first diode D _{3 of the} corresponding first diode pair 114, and causing a second terminal of the switch circuit 154 is electrically connected to a position corresponding to the first node N ₂ and a first diode ₄ between the third pair of the first diode 114 to another point D N _22. The switch circuit 156 also has a first end, a second end, and a plurality of switches Q ₅ and Q ₆ electrically connected in series between the first end and the second end, and coupled to the corresponding first diode pair 116, The first end of the switch circuit 156 is electrically connected to the second node N ₃₁ between the first node N ₃ and a first diode D _{5 of the} corresponding first diode pair 116, and the switch is made a second terminal of the circuit 156 is connected to a third node located between the node N ₃ and ₆ corresponding to first diode 116 in the other first diode D N _32. In Figure 1, all three switching circuits 152, 154 and 156 of switches _{Q 1, Q 2, Q 3} , Q 4, Q 5 and Q ₆ comprises a MOS switch.

The voltage source 140 is electrically coupled in parallel between the two output terminals 132 and 134 and is electrically coupled to each of the switch circuits 112, 114, and 116 at nodes N ₅₁ , N _{52 ,} and N ₅₃ , respectively. Specifically, the voltage source 140 has two series-connected polarization capacitors (storage capacitors) C ₄ and C ₅ , a polarization node C ₄ and C ₅ defining a fourth node N ₄ , and at a fourth node N ₄ Electrically connected to each of the switch circuits 112, 114, and 116.

According to the embodiment shown in FIG. 1, the three-phase rectifying circuit 100 uses only six diodes (the first diodes D ₁ , D ₂ , D ₃ , D _{4 of the} three first diode pairs 112, 114 and 116) , D ₅ and D ₆ ) and six MOS switches (switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ and Q _{6 of the} three switching circuits 152, 154 and 156). Thus, the circuit components required in the three-phase rectifier circuit 100 will be less than those required in conventional three-phase PFC circuits.

2 shows a detailed circuit diagram of a three-phase rectifier circuit 200, which is substantially identical to the three-phase rectifier circuit 100 of FIG. 1, in accordance with another embodiment of the present invention, and thus all components are numbered with similar numerals. For example, as shown in FIG. 2, the three-phase rectifier circuit 200 has three inputs 222, 224, and 226 and two outputs 232 and 234. Further, the three-phase rectifier circuit 200 has a three-phase diode bridge 210, a voltage source 240, and three switching circuits 250. Also, the three-phase diode bridge 210 has three first diode pairs 212, 214, and 216 electrically coupled in parallel to the two output terminals 232 and 234, and the three switching circuits 250 include switching circuits 252, 254, and 256. The embodiment of FIG. 2 differs from the embodiment of FIG. 1 in that all of the switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ of the three switching circuits 252, 254 and 256 of FIG. Q ₆ includes an IGBT switch. Other elements and features of the embodiment in Fig. 2 are substantially the same as those in Fig. 1, and thus a detailed description thereof will be omitted.

According to the embodiment shown in Figure 2, the three-phase rectifier circuit 200 uses only six diodes (the first diodes D ₁ , D ₂ , D ₃ , D of the three first diode pairs 212, 214 and 216) ₄ , D ₅ and D ₆ ) and six IGBT switches (switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ and Q _{6 of the} three switching circuits 252, 254 and 256). Thus, the circuit components required in the three-phase rectifier circuit 200 will be less than the circuit components required in conventional three-phase PFC circuits.

3 shows a specific circuit diagram of a three-phase rectifying circuit 300, which is similar to the three-phase rectifying circuit 100 of FIG. 1, in accordance with still another embodiment of the present invention, and thus all components are numbered with like numerals. For example, as shown in FIG. 3, the three-phase rectifier circuit 300 has three inputs 322, 324, and 326 and two outputs 332 and 334. Further, the three-phase rectifier circuit 300 has a three-phase diode bridge 310, a voltage source 340, and three switching circuits 350. Also, the three-phase diode bridge 310 has three first diode pairs 312, 314, and 316 that are electrically coupled in parallel to the two output terminals 332 and 334, and the three switch circuits 350 include switching circuits 352, 354, and 356. The embodiment of FIG. 3 differs from the embodiment of FIG. 1 in that the three-phase diode bridge 310 further includes three second diode pairs 362, 364, and 366. The second diode pair 362 includes two second diodes D _A0 and D _A1 , and a second diode D _{A0 is} electrically connected to the first node N ₁ and the first node of the corresponding first diode pair 312 . Between the two nodes N ₁₁ , another second diode D _{A1 is} electrically connected between the first node N ₁ and the third node N _{12 of the} corresponding first diode pair 312. Similarly, the second diode pair 364 includes two second diodes D _B0 and D _B1 , and one second diode D _{B0 is} electrically connected to the first node N of the corresponding first diode pair 314 . ₂ and the second node N ₂₁ and another second diode D _{B1 are} electrically connected between the first node N ₂ and the third node N _{22 of the} corresponding first diode pair 314. The second diode pair 366 includes two second diodes D _C0 and D _C1 , and a second diode D _{C0 is} electrically connected to the first node N ₃ and the first node of the corresponding first diode pair 316 Between the two nodes N ₃₁ and another second diode D _{C1 are} electrically connected between the first node N ₃ and the third node N _{32 of the} corresponding first diode pair 316. Preferably, all of the first diodes D ₁ , D ₂ , D ₃ , D ₄ , D ₅ and D _{6 of the} three first diode pairs 312, 314 and 316 comprise fast recovery diodes and three second All of the second diodes D _A0 , D _A1 , D _B0 , D _B1 , D _{C0 ,} and D _{C1 of} diode pairs 362 , 364 , and 366 include slow recovery diodes.

According to the embodiment in FIG. 3, the three-phase rectifier circuit 300 uses 12 diodes (the first diodes D ₁ , D ₂ , D ₃ , D ₄ , D of the three first diode pairs 312, 314 and 316) ₅ and D ₆ , and the second diodes D _A0 , D _A1 , D _B0 , D _B1 , D _C0 and D _C1 ) of the three second diode pairs 362 , 364 and 366 ) and six MOS switches (three The switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q _{5 ,} and Q ₆ ) of the switching circuits 352, 354, and 356 are more than the six diodes and six switches used in FIG. However, all of the circuit components required in the three-phase rectifier circuit 300 will still be less than the circuit components required for conventional three-phase PFC circuits. Moreover, the increased three second diode pairs 362, 364, and 366 allow the three-phase rectifier circuit 300 to utilize standard voltage circuit components, such as the commonly used 600V components, rather than the high voltage 1200V components. Thus, the three-phase rectifier circuit 300 can achieve high efficiency with low-cost circuit components.

4 shows a detailed circuit diagram of a three-phase rectifying circuit 400 in accordance with still another embodiment of the present invention, which is substantially identical to the three-phase rectifying circuit 300 of FIG. 3, and thus all components are numbered with similar numerals. For example, as shown in FIG. 4, three-phase rectifier circuit 400 has three inputs 422, 424, and 426 and two outputs 432 and 434. Further, the three-phase rectifier circuit 400 has a three-phase diode bridge 410, a voltage source 440, and three switching circuits 450. Also, the three-phase diode bridge 410 has three first diode pairs 412, 414, and 416 that are electrically coupled in parallel to the two output terminals 432 and 434, and the three switching circuits 450 include switching circuits 452, 454, and 456. The three-phase diode bridge 410 also includes three second diode pairs 462, 464, and 466. The embodiment of Figure 4 differs from the embodiment of Figure 3 in that all of the switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ and Q of the three switching circuits 452, 454 and 456 of Figure 4 ₆ includes insulated gate bipolar transistor (IGBT) switches. Other elements and features of the embodiment in FIG. 4 are substantially the same as those in FIG. 3, and thus a detailed description thereof will be omitted.

According to the embodiment illustrated in Figure 4, the three-phase rectifier circuit 400 uses twelve diodes (the first diodes D ₁ , D ₂ , D ₃ , D _{4 of the} three first diode pairs 412, 414 and 416) , D ₅ and D ₆ , and the second diodes D _A0 , D _A1 , D _B0 , D _B1 , D _C0 and D _{C1 of the} three second diode pairs 462, 464 and 466 ) and six IGBT switches (The switches Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q _{5 ,} and Q _{6 of the} three switching circuits 452, 454, and 456) are more than the six diodes and six switches used in FIG. However, all of the circuit components required in the three-phase rectifier circuit 400 will still be less than the circuit components required for conventional three-phase PFC circuits. Moreover, the increased three second diode pairs 462, 464, and 466 allow the three-phase rectifier circuit 400 to utilize standard voltage circuit components, such as the commonly used 600V components, rather than the high voltage 1200V components. Thus, the three-phase rectifier circuit 400 can achieve high efficiency with low-cost circuit components.

According to the embodiment shown in Figs. 1 to 4, the three-phase rectifier circuit of the present invention can maintain a simple circuit layout without lowering the efficiency of the converter or increasing the harmonic current. In addition, the total number of circuit components required in the three-phase rectifier circuit can be reduced as compared to the total number of circuit components required for a conventional three-phase PFC circuit. Thus, the circuit cost and circuit control complexity can be relatively low and the reliability of the three-phase rectifier circuit can be maintained.

FIG. 5 shows a schematic diagram of a three-phase rectifier circuit 500 in accordance with one embodiment of the present invention. As shown in FIG. 5, the three-phase rectifier circuit 500 has an AC/DC rectifier circuit 502 and a converter circuit 600. The AC/DC rectifier circuit 502 can be any of the three-phase rectifier circuits 100-400 of the embodiment shown in Figures 1 through 4, or any other embodiment of the three-phase rectifier circuit of the present invention or achieve. In FIG. 5, the AC/DC rectifier circuit 502 has a three-phase PFC circuit 510 and a voltage source 540. A three phase PFC circuit 510 is used as the three phase diode bridge of the present invention and has two outputs 532 and 534. Outputs 532 and 534 are electrically coupled to converter circuit 600 via a high voltage DC link or DC bus. Three switching circuits connecting the three-phase diode bridge and other details of the three-phase PFC circuit 510 are not shown in Figure 5, and the three inputs of the three-phase diode bridge are shown with a schematic AC input. The voltage source 540 in the exemplary embodiment shown in Figure 5 includes two series connected polarization capacitors, such as electrolytic capacitors. Voltage source 540 can also be constructed from two series-connected, non-polar capacitors.

Converter circuit 600 is essentially a DC/DC converter that is electrically coupled to outputs 532 and 534 of three-phase PFC circuit 510. In accordance with the present invention, converter circuit 600 includes a plurality of modules, and each module has a first input, a second input, a first output, and a second output. In particular, converter circuit 600 in FIG. 5 includes two DC/DC converters 610 and 620. The first DC/DC converter 610 has a first input I ₁₁ , a second input I ₁₂ , a first output O _{11 ,} and a second output O ₁₂ . Likewise, the second DC/DC converter 620 has a first input I ₂₁ , a second input I ₂₂ , a first output O _{21 ,} and a second output O ₂₂ . All of the first output O ₁₁ , the second output O ₁₂ , the first output O _{21 ,} and the second output O _{22 of the} DC/DC converter are electrically connected in parallel to the DC output.

According to the invention, the first input of the first module and the second input of the last module are electrically connected to the output respectively, and the second input of any module other than the last module is electrically connected to the next The first input of the next module. In the exemplary embodiment illustrated in FIG. 5, ₁₁ and the second DC / DC converter 620 (the last module) of the second first DC / DC converter 610 (first block) of the first input I Inputs I ₂₂ are electrically coupled to outputs 532 and 534 of three-phase PFC circuit 510, respectively. The second input I _{12 of the} first DC/DC converter 610 (any module other than the last module) is electrically connected to the second DC/DC converter 620 (the tightness of the first DC/DC converter 610 module) The first input I ₂₁ of the next module).

It will be understood by those of ordinary skill in the art that in a converter circuit, these modules may be resonant converters, and the resonant converter may comprise an LLC series resonant DC/DC converter or an LLC parallel resonant DC/DC converter, or Any other type or configuration of resonant converter circuits. Additionally, the converter circuit can include more than two resonant converters, or other types of modules.

In summary, the present invention details, among other things, a three-phase rectifier circuit having three inputs and two outputs. The three-phase rectifier circuit includes: a three-phase diode bridge having three first diode pairs electrically connected in parallel to the two outputs, wherein each first diode pair includes two first poles connected in series a first node is defined between the two first diodes, and each of the first diode pairs is electrically connected to the corresponding first input terminal at the first node; and three switching circuits, each The switch circuit has a first end, a second end, and a plurality of switches electrically connected in series between the first end and the second end, and each switch circuit is coupled to the corresponding first diode pair such that the first The terminal is electrically connected to the second node between the first diode and the first node of the corresponding first diode pair, and the second end is electrically connected to the corresponding first diode The third node between the other first diode and the first node of the tube pair. In one aspect, the three-phase rectifier circuit further includes a voltage source electrically connected in parallel between the two inputs and electrically connected to each of the switch circuits. In another aspect, the three-phase diode bridge further includes three second diode pairs, wherein each second diode pair includes two second diodes, and one second diode is electrically connected in corresponding Between the first node and the second node of the first diode pair and another second diode are electrically connected between the first node and the third node of the corresponding first diode pair.

The foregoing description of the preferred embodiments of the invention is intended to Many modifications and variations are possible in light of the above teachings.

The embodiments of the present invention have been chosen and described in order to explain the principles of the embodiments of the invention Alternative embodiments will be apparent to those skilled in the art without departing from the scope of the invention. Accordingly, the scope of the invention is defined by the scope of the appended claims

100, 200, 300, 400, 500. . . Three-phase rectifier circuit

110, 210, 310, 410. . . Three-phase diode bridge

112, 114, 116, 212, 214, 216, 312, 314, 316, 412, 414, 416. . . First diode pair

122, 124, 126, 222, 224, 226, 322, 324, 326, 422, 424, 426. . . Input

132, 134, 232, 234, 332, 334, 432, 434, 532, 534. . . Output

140, 240, 340, 440, 540. . . power source

150, 152, 154, 156, 250, 252, 254, 256, 350, 352, 354, 356, 450, 452, 454, 456. . . Switch circuit

362, 364, 366, 462, 464, 466. . . Second diode pair

502. . . AC/DC rectifier circuit

510. . . Three-phase PFC circuit

600. . . Converter circuit

610. . . First DC/DC converter

620. . . Second DC/DC converter

C ₄ , C ₅ . . . Polarized capacitor (storage capacitor)

D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₆ . . . First diode

D _A0 , D _A1 , D _B0 , D _B1 , D _C0 , D _C1 . . . Second diode

I ₁₁ , I ₂₁ . . . First input

I ₁₂ , I ₂₂ . . . Second input

L ₁ , L ₂ , L ₃ . . . inductance

N ₁ , N ₂ , N ₃ . . . First node

N ₄ . . . Fourth node

N ₁₁ , N ₂₁ , N ₃₁ . . . Second node

N ₁₂ , N ₂₂ , N ₃₂ . . . Third node

N ₅₁ , N ₅₂ , N ₅₃ . . . node

O ₁₁ , O ₂₁ . . . First output

O ₁₂ , O ₂₂ . . . Second output

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , Q ₆ . . . switch

1 shows a detailed circuit diagram of a three-phase rectifier circuit in accordance with one embodiment of the present invention.

2 shows a specific circuit diagram of a three-phase rectifier circuit in accordance with another embodiment of the present invention.

FIG. 3 shows a specific circuit diagram of a three-phase rectifier circuit in accordance with still another embodiment of the present invention.

4 shows a detailed circuit diagram of a three-phase rectifier circuit in accordance with still another embodiment of the present invention.

Figure 5 shows a schematic diagram of a three-phase rectifier circuit in accordance with one embodiment of the present invention.

100. . . Three-phase rectifier circuit

110. . . Three-phase diode bridge

112, 114, 116. . . First diode pair

122, 124, 126. . . Input

132, 134. . . Output

140. . . power source

150, 152, 154, 156. . . Switch circuit

C ₄ , C ₅ . . . Polarized capacitor (storage capacitor)

D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₆ . . . First diode

L ₁ , L ₂ , L ₃ . . . inductance

N ₁ , N ₂ , N ₃ . . . First node

N ₄ . . . Fourth node

N ₁₁ , N ₂₁ , N ₃₁ . . . Second node

N ₁₂ , N ₂₂ , N ₃₂ . . . Third node

N ₅₁ , N ₅₂ , N ₅₃ . . . node

Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ , Q ₆ . . . switch

Claims (17)

A three-phase rectifier circuit having three input terminals and two output terminals, the three-phase rectifier circuit comprising:
(a) a three-phase diode bridge comprising three first diode pairs electrically coupled in parallel to the two outputs, wherein each first diode pair comprises two first diodes in series, the two Determining a first node between the first diodes, and each first diode pair is electrically connected to the corresponding input terminal at the first node; and (b) three switching circuits, each of the switching circuits having a first end, a second end, and a plurality of switches electrically connected in series between the first end and the second end, and each switch circuit is coupled to a corresponding first diode pair such that the first end Electrically connecting to a second node between the first diode and the first node of the corresponding first diode pair, and electrically connecting the second end to the corresponding first A third node between the other first diode of the diode pair and the first node. The three-phase rectifier circuit according to claim 1, further comprising a voltage source electrically connected in parallel between the two output terminals and electrically connected to each of the switch circuits. The three-phase rectifier circuit of claim 1 or 2, wherein all of the first diodes of the three first diode pairs comprise fast recovery diodes. The three-phase rectifier circuit of claim 1 or 2, wherein the three-phase diode bridge further comprises three pairs of second diodes, wherein each pair of second diodes comprises two second diodes a second diode electrically connected between the first node and the second node of the corresponding first diode pair, and another second diode electrically connected to the corresponding first Between the first node and the third node of a diode pair. The three-phase rectifier circuit of claim 4, wherein all of the first diodes of the three first diode pairs comprise a fast recovery diode, and all of the three second diode pairs The two diodes include a slow recovery diode. The three-phase rectifier circuit of claim 1 or 2, wherein each of the plurality of switches of the three switching circuits comprises a metal oxide semiconductor switch or an insulated gate bipolar transistor switch. The three-phase rectifier circuit of claim 2, wherein the voltage source comprises two capacitors connected in series, a fourth node is defined between the two capacitors, and the voltage source is electrically connected at the fourth node To each of the switching circuits. The three-phase rectifier circuit of claim 7, wherein the capacitor is a polarization capacitor. The three-phase rectifier circuit according to claim 1 or 2, further comprising a plurality of modules, each module having a first input, a second input, a first output, and a second output, wherein the first module The first input and the second input of the last module are electrically connected to the two outputs respectively, and the second input of any module other than the last module is electrically connected to the next module immediately following An input, and the first output and the second output of the plurality of modules are electrically connected in parallel. The three-phase rectifier circuit of claim 9, wherein each of the plurality of modules comprises a resonant converter. A three-phase rectifier circuit according to claim 10, wherein the resonant converter comprises an LLC series resonant DC/DC converter or an LLC parallel resonant DC/DC converter. A three-phase rectifier circuit comprising:
(a) a power factor correction PFC circuit having one or more inputs and two outputs electrically coupled to the AC power source;
And (b) a plurality of modules interleaved and electrically connected to the voltage source. The three-phase rectifier circuit of claim 12, wherein the PFC circuit comprises:
(a) a three-phase diode bridge comprising three first diode pairs electrically coupled in parallel to the two outputs of the PFC circuit, wherein each first diode pair comprises two first diodes connected in series, Determining a first node between the two first diodes, and each first diode is electrically connected to an input of the corresponding PFC circuit at the first node; and (b) three switching circuits, Each switching circuit has a first end, a second end, and a plurality of switches electrically connected in series between the first end and the second end, and each switching circuit is coupled to a corresponding first diode pair, The first end is electrically connected to a second node between the first diode and the first node of the corresponding first diode pair, and the second end is electrically connected to the second end a third node between the other first diode of the respective first diode pair and the first node. The three-phase rectifier circuit of claim 12, wherein the voltage source comprises one or more capacitors. The three-phase rectifier circuit of claim 12, wherein each module has a first input, a second input, a first output, and a second output, wherein the first input of the first module and the last module The second input is electrically connected to the output end of the PFC circuit, and the second input of any module other than the last module is electrically connected to the first input of the next module immediately following, and the plurality of modules The first output and the second output are electrically connected in parallel. A three-phase rectifier circuit according to claim 15 wherein each of the plurality of modules comprises a resonant converter. The three-phase rectifier circuit of claim 16, wherein the resonant converter comprises an LLC series resonant DC/DC converter or an LLC parallel resonant DC/DC converter.