Three-path full-wave rectification DCDC converter

Abstract

The utility model relates to a three-path full-wave rectification DCDC converter. Comprising a first primary side resonant conversion module, a second primary side resonant conversion module, a third primary side resonant conversion module, a first transformer module, a second transformer module, a third transformer module, a fourth transformer module, a fifth transformer module, a sixth transformer module, a first full-wave rectification module, a second full-wave rectification module and a third full-wave rectification module, the device comprises a first full-wave rectification module, a second full-wave rectification module, a fourth full-wave rectification module, a fifth full-wave rectification module, a sixth full-wave rectification module, a first output capacitor, a second output capacitor and a high-low voltage switching module. According to the DCDC converter with the three-path full-wave rectification, ripple current can be reduced, so that filtering modules can be reduced or omitted, and the size and the cost of the converter are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of DCDC converter, more specifically, to a three-way full wave rectification's DCDC converter. BACKGROUND

[0002] At present, the DCDC converter of new energy automobile is mostly small power, and the efficiency is not high, and the battery end voltage range is narrow. If wide range high power output is needed, multiple transformer modules need to be connected in parallel. The multiple parallel connection of transformer modules is prone to current sharing problems. In order to reduce the ripple current, the input side and the secondary side of the current DCDC converter need to be provided with a special filter module for filtering, resulting in large module size and high cost. SUMMARY

[0003] The utility model solves the technical problem, in view of the above defects of prior art, provide a three-way full wave rectification's DCDC converter, it can realize the current sharing of output capacitor in the case of wide range output, and reduce the ripple current.

[0004] The utility model solves its technical problem adopts the technical scheme: construct a three-way full wave rectification's DCDC converter, include: First primary side resonance conversion module, second primary side resonance conversion module, third primary side resonance conversion module, first transformer module, second transformer module, third transformer module, fourth transformer module, fifth transformer module, sixth transformer module, first full wave rectification module, second full wave rectification module, third full wave rectification module, fourth full wave rectification module, fifth full wave rectification module, sixth full wave rectification module, first output capacitor, second output capacitor and high low voltage switching module;

[0005] The first primary side resonance conversion module, the second primary side resonance conversion module and the third primary side resonance conversion module are connected in parallel to the voltage input end;The primary winding of the first transformer module and the second transformer module is connected in series and connected to the two ends of the first primary side resonance conversion module;The primary winding of the third transformer module and the fourth transformer module is connected in series and connected to the two ends of the second primary side resonance conversion module;The primary winding of the fifth transformer module and the sixth transformer module is connected in series and connected to the two ends of the third primary side resonance conversion module;The secondary winding of the first transformer module, the second transformer module, the third transformer module, the fourth transformer module, the fifth transformer module and the sixth transformer module is staggered connection;

[0006] The first end of the secondary winding of the first transformer module is connected to the first end of the first full-wave rectifier module, the second end of the secondary winding of the first transformer module is connected to the first end of the second full-wave rectifier module, the first end of the secondary winding of the second transformer module is connected to the second end of the second full-wave rectifier module, and the second end of the secondary winding of the second transformer module is connected to the second end of the first full-wave rectifier module; the first end of the secondary winding of the third transformer module is connected to the first end of the third full-wave rectifier module, the second end of the secondary winding of the third transformer module is connected to the first end of the fourth full-wave rectifier module, the first end of the secondary winding of the fourth transformer module is connected to the second end of the fourth full-wave rectifier module, and the second end of the secondary winding of the fourth transformer module is connected to the second end of the third full-wave rectifier module; the first end of the secondary winding of the fifth transformer module is connected to the first end of the fifth full-wave rectifier module, the second end of the secondary winding of the fifth transformer module is connected to the first end of the sixth full-wave rectifier module, the first end of the secondary winding of the sixth transformer module is connected to the second end of the sixth full-wave rectifier module, and the second end of the secondary winding of the sixth transformer module is connected to the second end of the fifth full-wave rectifier module;

[0007] The first end of the first output capacitor is connected to the third end of the first full-wave rectifier module, the third end of the third full-wave rectifier module, the third end of the fifth full-wave rectifier module and the first end of the high-low voltage switching module respectively; the second end of the first output capacitor is connected to the second end of the high-low voltage switching module; the first end of the second output capacitor is connected to the third end of the second full-wave rectifier module, the third end of the fourth full-wave rectifier module, the third end of the sixth full-wave rectifier module and the third end of the high-low voltage switching module respectively, and the second end of the second output capacitor is grounded; the fourth end of the high-low voltage switching module is grounded;

[0008] The first output capacitor and the second output capacitor are connected in series or parallel under the control of the high-low voltage switching module to output high-low voltage respectively.

[0009] In the three-way full-wave rectification DCDC converter, the first transformer module comprises a first primary winding, a first secondary winding and a second secondary winding; the second transformer module comprises a second primary winding, a third secondary winding and a fourth secondary winding; the third transformer module comprises a third primary winding, a fifth secondary winding and a sixth secondary winding; the fourth transformer module comprises a fourth primary winding, a seventh secondary winding and an eighth secondary winding; the fifth transformer module comprises a fifth primary winding, a ninth secondary winding and a tenth secondary winding; and the sixth transformer module comprises a sixth primary winding, an eleventh secondary winding and a twelfth secondary winding.

[0010] The same name end of the first primary winding is connected to the first output end of the first primary resonant conversion module, and the opposite name end is connected to the same name end of the second primary winding. The opposite name end of the second primary winding is connected to the second output end of the first primary resonant conversion module. The same name end of the third primary winding is connected to the first output end of the second primary resonant conversion module, and the opposite name end is connected to the same name end of the fourth primary winding. The opposite name end of the fourth primary winding is connected to the second output end of the second primary resonant conversion module. The same name end of the fifth primary winding is connected to the first output end of the third primary resonant conversion module, and the opposite name end is connected to the same name end of the sixth primary winding. The opposite name end of the sixth primary winding is connected to the second output end of the third primary resonant conversion module.

[0011] The same name end of the first secondary winding is connected to the first end of the first full-wave rectifier module. The opposite name end of the first secondary winding is connected to the same name end of the fourth secondary winding, the opposite name end of the fifth secondary winding, the same name end of the eighth secondary winding, the opposite name end of the ninth secondary winding, and the same name end of the twelfth secondary winding. The same name end of the second secondary winding is connected to the opposite name end of the third secondary winding, the same name end of the sixth secondary winding, the opposite name end of the seventh secondary winding, the same name end of the tenth secondary winding, and the opposite name end of the eleventh secondary winding. The opposite name end of the second secondary winding is connected to the first end of the second full-wave rectifier module. The same name end of the third secondary winding is connected to the second end of the second full-wave rectifier module. The opposite name end of the fourth secondary winding is connected to the second end of the first full-wave rectifier module. The same name end of the fifth secondary winding is connected to the first end of the third full-wave rectifier module. The opposite name end of the sixth secondary winding is connected to the first end of the fourth full-wave rectifier module. The same name end of the seventh secondary winding is connected to the second end of the fourth full-wave rectifier module. The opposite name end of the eighth secondary winding is connected to the second end of the third full-wave rectifier module. The same name end of the ninth secondary winding is connected to the first end of the fifth full-wave rectifier module. The opposite name end of the tenth secondary winding is connected to the first end of the sixth full-wave rectifier module. The same name end of the eleventh secondary winding is connected to the second end of the sixth full-wave rectifier module. The opposite name end of the twelfth secondary winding is connected to the second end of the fifth full-wave rectifier module.

[0012] The same name end of the second secondary winding, the opposite name end of the third secondary winding, the same name end of the sixth secondary winding, the opposite name end of the seventh secondary winding, the same name end of the tenth secondary winding, and the opposite name end of the eleventh secondary winding are grounded.

[0013] The three-way full-wave rectification DCDC converter, each full-wave rectification module comprises a first diode and a second diode, the anode of the first diode is connected to the first end of the full-wave rectification module, the anode of the second diode is connected to the second end of the full-wave rectification module, and the cathodes of the first diode and the second diode are connected to the third end of the full-wave rectification module.

[0014] The three-way full-wave rectification DCDC converter further comprises a first current transformer, a second current transformer and a third current transformer, the first current transformer is connected between the second primary winding and the first primary side resonant conversion module, the second current transformer is connected between the fourth primary winding and the second primary side resonant conversion module, and the third current transformer is connected between the sixth primary winding and the third primary side resonant conversion module.

[0015] The three-way full-wave rectification DCDC converter, the high-low voltage switching module comprises a first switch, a second switch and a third switch, the moving contact of the first switch is connected to the third end of the high-low voltage switching module, the static contact of the first switch is connected to the second end of the high-low voltage switching module and the moving contact of the third switch, the static contact of the third switch is connected to the fourth end of the high-low voltage switching module, and the static contact of the second switch is connected to the first end of the high-low voltage switching module and the moving contact of the second switch is connected to the third end of the high-low voltage switching module.

[0016] The three-way full-wave rectification DCDC converter, the first primary side resonant conversion module comprises a first primary side bridge network and a first primary side resonant network, the second primary side resonant conversion module comprises a second primary side bridge network and a second primary side resonant network, and the third primary side resonant conversion module comprises a third primary side bridge network and a third primary side resonant network.

[0017] The first primary side bridge network, the second primary side bridge network and the third primary side bridge network are connected in parallel to the voltage input end, the first primary side bridge network is connected to the primary winding of the first transformer module and the primary winding of the second transformer module through the first primary side resonant network, the second primary side bridge network is connected to the primary winding of the third transformer module and the primary winding of the fourth transformer module through the second primary side resonant network, the third primary side bridge network is connected to the primary winding of the fifth transformer module and the primary winding of the sixth transformer module through the third primary side resonant network, and the phases of the first primary side bridge network, the second primary side bridge network and the third primary side bridge network are staggered by 60 degrees.

[0018] The first primary side resonant network comprises a first resonant capacitor and a first resonant inductor; the second primary side resonant network comprises a second resonant capacitor and a second resonant inductor; the third primary side resonant network comprises a third resonant capacitor and a third resonant inductor;

[0019] The first end of the first resonant capacitor is connected with the first output end of the first primary side bridge network, and the second end is connected with the first end of the first resonant inductor; the second end of the first resonant inductor is connected with the second output end of the first primary side bridge network, the third end of the first resonant inductor is connected with the first end of the primary side winding of the first transformer module, the second end of the primary side winding of the first transformer module is connected with the first end of the primary side winding of the second transformer module, and the second end of the primary side winding of the second transformer module is connected with the fourth end of the first resonant inductor;

[0020] The first end of the second resonant capacitor is connected with the first output end of the second primary side bridge network, and the second end is connected with the first end of the second resonant inductor; the second end of the second resonant inductor is connected with the second output end of the second primary side bridge network, the third end of the second resonant inductor is connected with the first end of the primary side winding of the third transformer module, the second end of the primary side winding of the third transformer module is connected with the first end of the primary side winding of the fourth transformer module, and the second end of the primary side winding of the fourth transformer module is connected with the fourth end of the second resonant inductor;

[0021] The first end of the third resonant capacitor is connected with the first output end of the third primary side bridge network, and the second end is connected with the first end of the third resonant inductor; the second end of the third resonant inductor is connected with the second output end of the third primary side bridge network, the third end of the third resonant inductor is connected with the first end of the primary side winding of the fifth transformer module, the second end of the primary side winding of the fifth transformer module is connected with the first end of the primary side winding of the sixth transformer module, and the second end of the primary side winding of the sixth transformer module is connected with the fourth end of the third resonant inductor.

[0022] The first primary side bridge network, the second primary side bridge network and the third primary side bridge network are switch tube full bridge networks.

[0023] The first primary side bridge network, the second primary side bridge network and the third primary side bridge network are switch tube half bridge networks.

[0024] The three-way full-wave rectification DCDC converter of the utility model, since the primary winding of the first transformer module and the second transformer module are connected in series, the primary winding of the third transformer module and the fourth transformer module are connected in series, the primary winding of the fifth transformer module and the sixth transformer module are connected in series, then these series primary windings are connected in parallel with each other, and the secondary winding of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module, the fifth transformer module and the sixth transformer module are connected in an interleaved manner, thus series voltage equalization or parallel current equalization can be realized, and the first transformer module, the second transformer module, the third transformer module, the fourth transformer module, the fifth transformer module and the sixth transformer module are respectively connected with a first full-wave rectification module, a second full-wave rectification module, a third full-wave rectification module, a fourth full-wave rectification module, a fifth full-wave rectification module and a sixth full-wave rectification module to form six-way full-wave rectification, thus the ripple current can be reduced, and then the filter module can be reduced or omitted, the volume of the converter is reduced and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] The utility model will be further described below in combination with the drawings and examples, and the drawings are as follows:

[0026] Figure 1 is the principle block diagram of the preferred embodiment of the three-way full-wave rectification DCDC converter of the utility model;

[0027] Figure 2 is the circuit diagram of still another preferred embodiment of the three-way full-wave rectification DCDC converter of the utility model;

[0028] Figure 3 is the circuit diagram of still another preferred embodiment of the three-way full-wave rectification DCDC converter of the utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the utility model more clear and explicit, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0030] Figure 1 is the principle block diagram of the preferred embodiment of the three-way full-wave rectification DCDC converter of the utility model. As Figure 1The utility model discloses a three-way full-wave rectification's DCDC converter, include: first primary side resonance conversion module 11, second primary side resonance conversion module 12, third primary side resonance conversion module 13, first transformer module 21, second transformer module 22, third transformer module 23, fourth transformer module 24, fifth transformer module 25, sixth transformer module 26, first full-wave rectification module 31, second full-wave rectification module 32, third full-wave rectification module 33, fourth full-wave rectification module 34, fifth full-wave rectification module 35, sixth full-wave rectification module 36, output capacitor CH, output capacitor CL and high low voltage switching module 50.

[0031] The first primary side resonance conversion module 11, the second primary side resonance conversion module 12 and the third primary side resonance conversion module 13 are connected in parallel to the voltage input end;The primary winding of the first transformer module 21 and the second transformer module 22 is connected in series and connected at the two ends of the first primary side resonance conversion module 11;The primary winding of the third transformer module 23 and the fourth transformer module 24 is connected in series and connected at the two ends of the second primary side resonance conversion module 12;The primary winding of the fifth transformer module 25 and the sixth transformer module 26 is connected in series and connected at the two ends of the third primary side resonance conversion module 13;The secondary winding of the first transformer module 21, the second transformer module 22, the third transformer module 23, the fourth transformer module 24, the fifth transformer module 25 and the sixth transformer module 26 is staggered connection.

[0032] The first end of the secondary winding of the first transformer module 21 is connected to the first end of the first full-wave rectifier module 31, the second end of the secondary winding of the first transformer module 21 is connected to the first end of the second full-wave rectifier module 32, the first end of the secondary winding of the second transformer module 22 is connected to the second end of the second full-wave rectifier module 32, and the second end of the secondary winding of the second transformer module 22 is connected to the second end of the first full-wave rectifier module 31; the first end of the secondary winding of the third transformer module 23 is connected to the first end of the third full-wave rectifier module 33, the second end of the secondary winding of the third transformer module 23 is connected to the first end of the fourth full-wave rectifier module 34, the first end of the secondary winding of the fourth transformer module 24 is connected to the second end of the fourth full-wave rectifier module 34, and the second end of the secondary winding of the fourth transformer module 24 is connected to the second end of the third full-wave rectifier module 33; the first end of the secondary winding of the fifth transformer module 25 is connected to the first end of the fifth full-wave rectifier module 35, the second end of the secondary winding of the fifth transformer module 25 is connected to the first end of the sixth full-wave rectifier module 36, the first end of the secondary winding of the sixth transformer module 26 is connected to the second end of the sixth full-wave rectifier module 36, and the second end of the secondary winding of the sixth transformer module 26 is connected to the second end of the fifth full-wave rectifier module 35. The first end of the output capacitor CH is connected to the third end of the first full-wave rectifier module 31, the third end of the third full-wave rectifier module 33, the third end of the fifth full-wave rectifier module 35, and the first end of the high-low voltage switching module, respectively; the second end of the output capacitor CH is connected to the second end of the high-low voltage switching module; the first end of the output capacitor CL is connected to the third end of the second full-wave rectifier module 32, the third end of the fourth full-wave rectifier module 34, the third end of the sixth full-wave rectifier module 36, and the third end of the high-low voltage switching module, respectively, and the second end of the output capacitor CL is grounded. The fourth end of the high-low voltage switching module is grounded. The output capacitor CH and the output capacitor CL are connected in series or parallel under the control of the high-low voltage switching module to output high and low voltage, respectively.

[0033] In one preferred embodiment of the present application, the first primary side resonant conversion module 11, the second primary side resonant conversion module 12 and the third primary side resonant conversion module 13 can adopt any known resonant conversion module, for example, it can include a resonant network and a bridge network. Here, any known bridge network can be adopted, such as a full-bridge network composed of four switches, a half-bridge network composed of two switches, which all fall within the protection scope of the present application. Here, any known switch can be adopted, for example, MOS tube, IGBT tube. Similarly, any known resonant network can also be adopted, for example, LC series resonant network, LLC series resonant network, SRC series resonant network, PRC parallel resonant network or LCC series-parallel resonant network, which all fall within the protection scope of the present application.

[0034] In one preferred embodiment of the present application, the first transformer module 21, the second transformer module 22, the third transformer module 23, the fourth transformer module 24, the fifth transformer module 25 and the sixth transformer module 26 can be respectively formed by two transformers or a plurality of transformers in series.

[0035] In one preferred embodiment of the present application, the first full-wave rectification module 31, the second full-wave rectification module 32, the third full-wave rectification module 33, the fourth full-wave rectification module 34, the fifth full-wave rectification module 35 and the sixth full-wave rectification module 36 can also adopt any known full-wave rectifier, such as a diode rectification module. The first output capacitor 41 and the second output capacitor 42 can be respectively configured by corresponding output capacitors.

[0036] In one preferred embodiment of the present application, the high-low voltage switching module 50 can include a plurality of switching devices, for example, three single-pole single-throw switches, single-pole double-throw switches, two single-pole double-throw switches. Of course, in other preferred embodiments of the present application, switching devices such as switch tubes can also be adopted.

[0037] The three-way full-wave rectification DCDC converter of the utility model, since the primary winding of the first transformer module and the second transformer module are connected in series, the primary winding of the third transformer module and the fourth transformer module are connected in series, the primary winding of the fifth transformer module and the sixth transformer module are connected in series, then the series-connected primary windings are connected in parallel with each other, and the secondary winding of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module, the fifth transformer module and the sixth transformer module are connected in an interleaved manner, thus series voltage equalization or parallel current equalization can be realized, and the first transformer module, the second transformer module, the third transformer module, the fourth transformer module, the fifth transformer module and the sixth transformer module are respectively connected with a first full-wave rectification module, a second full-wave rectification module, a third full-wave rectification module, a fourth full-wave rectification module, a fifth full-wave rectification module and a sixth full-wave rectification module to form six-way full-wave rectification, thus the ripple current can be reduced, and then the filter module can be reduced or omitted, the volume of the converter is reduced and the cost is reduced.

[0038] Figure 2 is the circuit diagram of another preferred embodiment of the three-way full-wave rectification DCDC converter of the utility model. In combination with Figures 1-2 It can be known that the three-way full-wave rectification DCDC converter of the utility model comprises a first primary side resonance conversion module 11, a second primary side resonance conversion module 12, a third primary side resonance conversion module 13, a first transformer module 21, a second transformer module 22, a third transformer module 23, a fourth transformer module 24, a fifth transformer module 25, a sixth transformer module 26, a first full-wave rectification module 31, a second full-wave rectification module 32, a third full-wave rectification module 33, a fourth full-wave rectification module 34, a fifth full-wave rectification module 35, a sixth full-wave rectification module 36, an output capacitor CH, an output capacitor CL and a high-low voltage switching module 50.

[0039] Further as Figure 2As shown, the first transformer module 21 includes a transformer T11, which includes a first primary winding N1, a first secondary winding N12, and a second secondary winding N13. The second transformer module 22 includes a transformer T12, which includes a second primary winding N2, a third secondary winding N22, and a fourth secondary winding N23. The third transformer module 23 includes a transformer T21, which includes a third primary winding N3, a fifth secondary winding N32, and a sixth secondary winding N33. The fourth transformer module 24 includes a transformer T22, which includes a fourth primary winding N4, a seventh secondary winding N42, and an eighth secondary winding N43. The fifth transformer module 25 includes a transformer T31, which includes a fifth primary winding N5, a ninth secondary winding N52, and a tenth secondary winding N53. The sixth transformer module 26 includes a transformer T32 , and the transformer T31 includes a sixth primary winding N6 , an eleventh secondary winding N62 , and a twelfth secondary winding N63 .

[0040] Those skilled in the art will appreciate that the first transformer module 21, the second transformer module 22, the third transformer module 23, the fourth transformer module 24, the fifth transformer module 25, and the sixth transformer module 26 may include any number of transformers, which may be connected in any suitable manner, such as in series or in parallel, so as to satisfy the requirement that each transformer module includes one primary winding and two secondary windings. The first transformer module 21 includes a first primary winding N1, a first secondary winding N12, and a second secondary winding N13; the second transformer module 22 includes a second primary winding N2, a third secondary winding N22, and a fourth secondary winding N23; the third transformer module 23 includes a third primary winding N3, a fifth secondary winding N32, and a sixth secondary winding N33; the fourth transformer module 24 includes a fourth primary winding N4, a seventh secondary winding N42, and an eighth secondary winding N43; and the fifth transformer module 25 includes a fifth primary winding N5, a ninth secondary winding N52, and a tenth secondary winding N53. The sixth transformer module 26 includes a sixth primary winding N6 , an eleventh secondary winding N62 , and a twelfth secondary winding N63 .

[0041] Further Figure 2As shown, the first full-wave rectifier module 31 includes a diode D11 and a diode D12; the third full-wave rectifier module 33 includes a diode D13 and a diode D14; the fifth full-wave rectifier module 35 includes a diode D15 and a diode D16; the second full-wave rectifier module 32 includes a diode D21 and a diode D22; the fourth full-wave rectifier module 34 includes a diode D23 and a diode D24. The sixth full-wave rectifier module 36 includes a diode D25 and a diode D26. The first primary resonant conversion module 11 includes a first primary bridge network and a first primary resonant network; the second primary resonant conversion module 12 includes a second primary bridge network and a second primary resonant network; the third primary resonant conversion module 13 includes a third primary bridge network and a third primary resonant network. Figure 2 As shown, the first primary bridge network includes a switching transistor full-bridge network consisting of switching transistors Q11-Q14. The first primary resonant network includes a first resonant capacitor Cr1 and a first resonant inductor Lr1. The second primary bridge network includes a switching transistor full-bridge network consisting of switching transistors Q21-Q24. The second primary resonant network includes a second resonant capacitor Cr2 and a second resonant inductor Lr2. The third primary bridge network includes a switching transistor full-bridge network consisting of switching transistors Q31-Q34.

[0042] The third primary resonant network includes a third resonant capacitor Cr3 and a third resonant inductor Lr3. Figure 2 As shown, the high-low voltage switching module 500 includes a first switch K1, a second switch K2 and a third switch K3.

[0043] like Figure 2 As shown, the switches Q11-Q12, Q21-Q24, and Q31-Q34 can be MOS transistors, whose gates receive control signals. The source of the switch Q11 is connected to the drain of the switch Q12 and forms the first output of the first primary bridge network. The source of the switch Q13 is connected to the drain of the switch Q14 and forms the second output of the first primary bridge network. The drain of the switch Q11 is connected to the drain of the switch Q13 and forms the first input of the first primary bridge network. The source of the switch Q12 is connected to the source of the switch Q14 and forms the second input of the first primary bridge network. The first and second inputs of the first primary bridge network are connected to the positive and negative electrodes of the voltage input terminal Vin. The first end of the first resonant capacitor Cr1 is connected to the first output of the first primary bridge network, and the second end is connected to the first end of the first resonant inductor Lr1. The second end of the first resonant inductor Lr1 is connected to the second output of the first primary bridge network.

[0044] The source of the switch tube Q21 is connected with the drain of the switch tube Q22 and forms the first output end of the second primary side bridge network, the source of the switch tube Q23 is connected with the drain of the switch tube Q24 and forms the second output end of the second primary side bridge network, the drain of the switch tube Q21 is connected with the drain of the switch tube Q23 and forms the first input end of the second primary side bridge network, the source of the switch tube Q22 is connected with the source of the switch tube Q24 and forms the second input end of the second primary side bridge network. The first input end and the second input end of the second primary side bridge network are connected with the positive and negative poles of the voltage input end Vin. The first end of the second resonant capacitor Cr2 is connected with the first output end of the second primary side bridge network, the second end is connected with the first end of the second resonant inductor Lr2; the second end of the second resonant inductor Lr2 is connected with the second output end of the second primary side bridge network.

[0045] The source of the switch tube Q31 is connected with the drain of the switch tube Q32 and forms the first output end of the third primary side bridge network, the source of the switch tube Q33 is connected with the drain of the switch tube Q34 and forms the second output end of the third primary side bridge network, the drain of the switch tube Q31 is connected with the drain of the switch tube Q33 and forms the first input end of the third primary side bridge network, the source of the switch tube Q32 is connected with the source of the switch tube Q34 and forms the second input end of the third primary side bridge network. The first input end and the second input end of the third primary side bridge network are connected with the positive and negative poles of the voltage input end Vin. The first end of the third resonant capacitor Cr3 is connected with the first output end of the third primary side bridge network, the second end is connected with the first end of the third resonant inductor Lr3; the second end of the third resonant inductor Lr3 is connected with the second output end of the third primary side bridge network.

[0046] Further as Figure 2As shown, the same name end of the first primary winding N1 is connected to the first output end (i.e. the third end of the first resonant inductor Lr1) of the first primary resonant conversion module 11, and the opposite name end is connected to the same name end of the second primary winding N2, the opposite name end of the second primary winding N2 is connected to the second output end (i.e. the fourth end of the first resonant inductor Lr1) of the first primary resonant conversion module 11; the same name end of the third primary winding N3 is connected to the first output end (i.e. the third end of the second resonant inductor Lr2) of the second primary resonant conversion module 12, and the opposite name end is connected to the same name end of the fourth primary winding N4, the opposite name end of the fourth primary winding N4 is connected to the second output end (i.e. the fourth end of the second resonant inductor Lr2) of the second primary resonant conversion module 12. The same name end of the fifth primary winding N5 is connected to the first output end (i.e. the third end of the third resonant inductor Lr3) of the third primary resonant conversion module 13, and the opposite name end is connected to the same name end of the sixth primary winding N6, the opposite name end of the sixth primary winding N6 is connected to the second output end (i.e. the fourth end of the third resonant inductor Lr3) of the third primary resonant conversion module 13.

[0047] The same name end of the first secondary winding N12 is connected to the first end of the first full-wave rectifier module 31 (i.e. the anode of diode D11), and the opposite name end of the first secondary winding N12 is connected to the same name end of the fourth secondary winding N23, the opposite name end of the fifth secondary winding N32, the same name end of the eighth secondary winding N43, the opposite name end of the ninth secondary winding N52 and the same name end of the twelfth secondary winding N63. The same name end of the second secondary winding N13 is connected to the opposite name end of the third secondary winding N22, the same name end of the sixth secondary winding N33, the opposite name end of the seventh secondary winding N42, the same name end of the tenth secondary winding N53 and the opposite name end of the eleventh secondary winding N62, and the opposite name end of the second secondary winding N13 is connected to the first end of the second full-wave rectifier module 32 (i.e. the anode of diode D21). The same name end of the third secondary winding N22 is connected to the second end of the second full-wave rectifier module 32 (i.e. the anode of diode D22), and the opposite name end of the fourth secondary winding N23 is connected to the second end of the first full-wave rectifier module 31 (i.e. the anode of diode D12). The same name end of the fifth secondary winding N32 is connected to the first end of the third full-wave rectifier module 33 (i.e. the anode of diode D13), the opposite name end of the sixth secondary winding N33 is connected to the first end of the fourth full-wave rectifier module 34 (i.e. the anode of diode D23), the same name end of the seventh secondary winding N42 is connected to the second end of the fourth full-wave rectifier module 34 (i.e. the anode of diode D24), and the opposite name end of the eighth secondary winding N43 is connected to the second end of the third full-wave rectifier module 33 (i.e. the anode of diode D14). The same name end of the ninth secondary winding N52 is connected to the first end of the fifth full-wave rectifier module 35 (i.e. the anode of diode D15), the opposite name end of the tenth secondary winding N53 is connected to the first end of the sixth full-wave rectifier module 36 (i.e. the anode of diode D25), the same name end of the eleventh secondary winding N62 is connected to the second end of the sixth full-wave rectifier module 36 (i.e. the anode of diode D26), and the opposite name end of the twelfth secondary winding N63 is connected to the second end of the fifth full-wave rectifier module 35 (i.e. the anode of diode D16). The same name end of the second secondary winding N13, the opposite name end of the third secondary winding N22, the same name end of the sixth secondary winding N33, the opposite name end of the seventh secondary winding N42, the same name end of the tenth secondary winding N53 and the opposite name end of the eleventh secondary winding N62 are grounded. The cathodes of the diode D11, the diode D12, the diode D13, the diode D14, the diode D15, the diode D16 are all connected to the first end of the first output capacitor CH and the static contact of the second switch K2.The cathodes of the diode D21, the diode D22, the diode D23, the diode D24, the diode D25 and the diode D26 are connected to the first end of the second output capacitor CL, the moving contact of the second switch K2 and the moving contact of the first switch K1. The stationary contact of the first switch K1 and the second end of the first output capacitor CH are connected to the non-identical end of the first secondary winding N12, the identical end of the fourth secondary winding N23, the non-identical end of the fifth secondary winding N32, the identical end of the eighth secondary winding N43, the non-identical end of the ninth secondary winding N52 and the twelfth secondary winding N63. The moving contact of the third switch K3 is connected to the ground, and the stationary contact is connected to the stationary contact of the first switch K1. Here, the moving contacts of the first switch K1-K2 can be switched to make the first output capacitor CH and the second output capacitor CL series or parallel to realize high and low voltage output. The specific control process is known, and will not be repeated here.

[0048] In Figure 2 In the preferred embodiment shown, further comprising a first current transformer CT1, a second current transformer CT2 and a third current transformer CT3; the first current transformer CT1 is connected between the second primary winding N2 and the fourth end of the first resonant inductor Lr1; the second current transformer CT2 is connected between the fourth primary winding N4 and the fourth end of the second resonant inductor Lr2; the third current transformer CT3 is connected between the sixth primary winding N6 and the third resonant inductor Lr3.

[0049] In Figure 2In the shown preferred embodiment, the switch tubes Q11-Q14 and transformers T11, T22 form a first resonant circuit; the switch tubes Q21-Q24 and transformers T21, T22 form a second resonant circuit; the switch tubes Q31-Q34 and transformers T31, T32 form a third resonant circuit; the control signals of the switch tubes Q11-Q14, the control signals of the switch tubes Q21-Q24 and the control signals of the switch tubes Q31-Q34 are staggered by 90°. The first secondary winding N12 of the transformer T11 of the first resonant circuit and the fourth secondary winding N23 of the transformer T12 are connected in series. The opposite ends of the first secondary winding N12 of the transformer T11 and the same ends of the fourth secondary winding N23 of the transformer T12 are connected in series to form a full-wave rectification circuit to supply power to the first output capacitor CH; the same ends of the second secondary winding N13 of the transformer T11 and the opposite ends of the third secondary winding N22 of the transformer T12 are connected in series to form a full-wave rectification circuit to supply power to the second output capacitor CL. Similarly, the opposite ends of the fifth secondary winding N32 of the transformer T21 and the same ends of the eighth secondary winding N43 of the transformer T22 are connected in series to form a full-wave rectification circuit to supply power to the first output capacitor CH; the same ends of the sixth secondary winding N33 of the transformer T21 and the opposite ends of the seventh secondary winding N42 of the transformer T22 are connected in series to form a full-wave rectification circuit to supply power to the second output capacitor CL. Similarly, the opposite ends of the ninth secondary winding N52 of the transformer T31 and the same ends of the twelfth secondary winding N63 of the transformer T32 are connected in series to form a full-wave rectification circuit to supply power to the first output capacitor CH; the same ends of the tenth secondary winding N53 of the transformer T31 and the opposite ends of the eleventh secondary winding N62 of the transformer T32 are connected in series to form a full-wave rectification circuit to supply power to the second output capacitor CL. Therefore, the first output capacitor CH is charged by the first secondary winding N12 of the transformer T11 of the first resonant circuit, the fourth secondary winding N23 of the transformer T12, the fifth secondary winding N32 of the transformer T21 of the second resonant circuit, the eighth secondary winding N43 of the transformer T22, the ninth secondary winding N52 of the transformer T31 of the third resonant circuit and the twelfth secondary winding N63 of the transformer T32, which can realize the ripple current staggered by 60° and reduce the ripple current of the electrolytic capacitor. Similarly, the second output capacitor CL is charged by the second secondary winding N13 of the transformer T11 of the first resonant circuit, the third secondary winding N22 of the transformer T12, the sixth secondary winding N33 of the transformer T21 of the second resonant circuit, the seventh secondary winding N42 of the transformer T22, the tenth secondary winding N53 of the transformer T31 of the third resonant circuit and the eleventh secondary winding N62 of the transformer T32, which can realize the ripple current staggered by 60° and reduce the ripple current of the electrolytic capacitor.Further, the primary windings of the transformer T11, the transformer T21, the transformer T21, the transformer T22, the transformer T31 and the transformer T32 are connected in parallel, and each half of the secondary windings charges the first output capacitor CH, and the other half of the secondary windings charges the second output capacitor CL.

[0050] Figure 3 is a circuit diagram of still another preferred embodiment of the three-way full-wave rectification DC / DC converter of the utility model. Figure 3 The embodiment shown in the figure is similar to the Figure 2 The difference is that, as shown in the figure, the first primary bridge network comprises a switch tube half-bridge network composed of switch tubes Q11-Q12. Figure 2 The second primary bridge network comprises a switch tube half-bridge network composed of switch tubes Q21-Q22, and the third primary bridge network comprises a switch tube half-bridge network composed of switch tubes Q31 and Q32.The corresponding first primary resonance network comprises a first resonance capacitor Cr1 and a first resonance inductor Lr1.The second primary resonance network comprises a second resonance capacitor Cr2 and a second resonance inductor Lr2.The third primary resonance network comprises a third resonance capacitor Cr3 and a third resonance inductor Lr3, and their connection relationship is as shown in the figure. Figure 3

[0051] The working process, principle and beneficial effects thereof are similar to those of the embodiment shown in the figure. Figure 2 Based on the common knowledge and the teachings shown in the figure, the person skilled in the art can realize the embodiment shown in the figure, which will not be described here. Figure 2 Figure 3

[0052] The DCDC converter of the three-way full-wave rectification is implemented, the primary winding of the first transformer module and the second transformer module is connected in series, the primary winding of the third transformer module and the fourth transformer module is connected in series, the primary winding of the fifth transformer module and the sixth transformer module is connected in series, then the primary windings connected in series are connected in parallel with each other, and the secondary winding of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module, the fifth transformer module and the sixth transformer module are connected in an interleaved manner, so that series voltage sharing or parallel current sharing can be realized, and the first transformer module, the second transformer module, the third transformer module, the fourth transformer module, the fifth transformer module and the sixth transformer module are respectively connected with a first full-wave rectification module, a second full-wave rectification module, a third full-wave rectification module, a fourth full-wave rectification module, a fifth full-wave rectification module and a sixth full-wave rectification module to form six-way full-wave rectification, so that the ripple current can be reduced, and then the filter module can be reduced or omitted, the volume of the converter is reduced and the cost is reduced.

[0053] Although the utility model is explained through specific embodiments, those skilled in the art should understand that, without departing from the scope of the utility model, various transformations and equivalent substitutions of the utility model can be carried out.In addition, for specific situations or materials, various modifications can be made to the utility model without departing from the scope of the utility model.Therefore, the utility model is not limited to the disclosed specific embodiments, and should include all the embodiments falling within the scope of the claims of the utility model.

[0054] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model. The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A three-way full-wave rectifier DCDC converter, characterized in that: include: a first primary resonant conversion module, a second primary resonant conversion module, a third primary resonant conversion module, a first transformer module, a second transformer module, a third transformer module, a fourth transformer module, a fifth transformer module, a sixth transformer module, a first full-wave rectifier module, a second full-wave rectifier module, a third full-wave rectifier module, a fourth full-wave rectifier module, a fifth full-wave rectifier module, a sixth full-wave rectifier module, a first output capacitor, a second output capacitor, and a high-low voltage switching module; The first primary resonant conversion module, the second primary resonant conversion module and the third primary resonant conversion module are connected in parallel to the voltage input terminal; the primary windings of the first transformer module and the second transformer module are connected in series and then connected to the two ends of the first primary resonant conversion module; the primary windings of the third transformer module and the fourth transformer module are connected in series and then connected to the two ends of the second primary resonant conversion module; the primary windings of the fifth transformer module and the sixth transformer module are connected in series and then connected to the two ends of the third primary resonant conversion module; the secondary windings of the first transformer module, the second transformer module, the third transformer module, the fourth transformer module, the fifth transformer module and the sixth transformer module are connected in series; The first end of the secondary winding of the first transformer module is connected to the first end of the first full-wave rectifier module, the second end of the secondary winding of the first transformer module is connected to the first end of the second full-wave rectifier module, the first end of the secondary winding of the second transformer module is connected to the second end of the second full-wave rectifier module, and the second end of the secondary winding of the second transformer module is connected to the second end of the first full-wave rectifier module; the first end of the secondary winding of the third transformer module is connected to the first end of the third full-wave rectifier module, and the second end of the secondary winding of the third transformer module is connected to the first end of the fourth full-wave rectifier module. The first end of the secondary winding of the fourth transformer module is connected to the second end of the fourth full-wave rectifier module, and the second end of the secondary winding of the fourth transformer module is connected to the second end of the third full-wave rectifier module; the first end of the secondary winding of the fifth transformer module is connected to the first end of the fifth full-wave rectifier module, and the second end of the secondary winding of the fifth transformer module is connected to the first end of the sixth full-wave rectifier module, the first end of the secondary winding of the sixth transformer module is connected to the second end of the sixth full-wave rectifier module, and the second end of the secondary winding of the sixth transformer module is connected to the second end of the fifth full-wave rectifier module; The first end of the first output capacitor is respectively connected to the third end of the first full-wave rectifier module, the third end of the third full-wave rectifier module, the third end of the fifth full-wave rectifier module, and the first end of the high-low voltage switching module; the second end of the first output capacitor is connected to the second end of the high-low voltage switching module; the first end of the second output capacitor is respectively connected to the third end of the second full-wave rectifier module, the third end of the fourth full-wave rectifier module, the third end of the sixth full-wave rectifier module, and the third end of the high-low voltage switching module, the second end of the second output capacitor is grounded; the fourth end of the high-low voltage switching module is grounded; The first output capacitor and the second output capacitor are connected in series or in parallel under the control of the high-low voltage switching module to output high and low voltages respectively.

2. The three-way full-wave rectified DCDC converter according to claim 1, characterized in that: The first transformer module includes a first primary winding, a first secondary winding, and a second secondary winding; the second transformer module includes a second primary winding, a third secondary winding, and a fourth secondary winding; the third transformer module includes a third primary winding, a fifth secondary winding, and a sixth secondary winding; the fourth transformer module includes a fourth primary winding, a seventh secondary winding, and an eighth secondary winding; the fifth transformer module includes a fifth primary winding, a ninth secondary winding, and a tenth secondary winding; the sixth transformer module includes a sixth primary winding, an eleventh secondary winding, and a twelfth secondary winding; The same-name end of the first primary winding is connected to the first output end of the first primary resonant conversion module, and the opposite-name end is connected to the same-name end of the second primary winding, and the opposite-name end of the second primary winding is connected to the second output end of the first primary resonant conversion module; the same-name end of the third primary winding is connected to the first output end of the second primary resonant conversion module, and the opposite-name end is connected to the same-name end of the fourth primary winding, and the opposite-name end of the fourth primary winding is connected to the second output end of the second primary resonant conversion module; the same-name end of the fifth primary winding is connected to the first output end of the third primary resonant conversion module, and the opposite-name end is connected to the same-name end of the sixth primary winding, and the opposite-name end of the sixth primary winding is connected to the second output end of the third primary resonant conversion module; The same-name end of the first secondary winding is connected to the first end of the first full-wave rectifier module, and the opposite-name end of the first secondary winding is connected to the same-name end of the fourth secondary winding, the opposite-name end of the fifth secondary winding, the same-name end of the eighth secondary winding, the opposite-name end of the ninth secondary winding, and the same-name end of the twelfth secondary winding; the same-name end of the second secondary winding is connected to the opposite-name end of the third secondary winding, the same-name end of the sixth secondary winding, the opposite-name end of the seventh secondary winding, the same-name end of the tenth secondary winding, and the opposite-name end of the eleventh secondary winding, and the opposite-name end of the second secondary winding is connected to the first end of the second full-wave rectifier module; the same-name end of the third secondary winding is connected to the second end of the second full-wave rectifier module, and the fourth secondary winding is connected to the opposite-name end of the The opposite end of the fifth secondary winding is connected to the second end of the first full-wave rectifier module; the same end of the fifth secondary winding is connected to the first end of the third full-wave rectifier module; the opposite end of the sixth secondary winding is connected to the first end of the fourth full-wave rectifier module; the same end of the seventh secondary winding is connected to the second end of the fourth full-wave rectifier module, and the opposite end of the eighth secondary winding is connected to the second end of the third full-wave rectifier module; the same end of the ninth secondary winding is connected to the first end of the fifth full-wave rectifier module; the opposite end of the tenth secondary winding is connected to the first end of the sixth full-wave rectifier module; the same end of the eleventh secondary winding is connected to the second end of the sixth full-wave rectifier module, and the opposite end of the twelfth secondary winding is connected to the second end of the fifth full-wave rectifier module The same-name end of the second secondary winding, the opposite-name end of the third secondary winding, the same-name end of the sixth secondary winding, the opposite-name end of the seventh secondary winding, the same-name end of the tenth secondary winding, and the opposite-name end of the eleventh secondary winding are grounded.

3. The three-way full-wave rectified DCDC converter according to claim 2, characterized in that: Each of the full-wave rectifier modules includes a first diode and a second diode, wherein the anode of the first diode is connected to the first end of the full-wave rectifier module, the anode of the second diode is connected to the second end of the full-wave rectifier module, and the cathodes of the first diode and the second diode are both connected to the third end of the full-wave rectifier module.

4. The three-way full-wave rectified DCDC converter according to claim 2, characterized in that: It further includes a first current transformer, a second current transformer and a third current transformer; the first current transformer is connected between the second primary winding and the first primary resonant conversion module; the second current transformer is connected between the fourth primary winding and the second primary resonant conversion module; and the third current transformer is connected between the sixth primary winding and the third primary resonant conversion module.

5. The three-way full-wave rectified DCDC converter according to any one of claims 1 to 4, characterized in that: The high-low voltage switching module includes a first switch, a second switch and a third switch. The moving contact of the first switch is connected to the third end of the high-low voltage switching module, and the static contact is connected to the second end of the high-low voltage switching module and the moving contact of the third switch. The static contact of the third switch is connected to the fourth end of the high-low voltage switching module. The static contact of the second switch is connected to the first end of the high-low voltage switching module, and the moving contact is connected to the third end of the high-low voltage switching module.

6. The three-way full-wave rectified DCDC converter according to any one of claims 1 to 4, characterized in that: The first primary resonant conversion module includes a first primary bridge network and a first primary resonant network; the second primary resonant conversion module includes a second primary bridge network and a second primary resonant network; the third primary resonant conversion module includes a third primary bridge network and a third primary resonant network; The first primary bridge network, the second primary bridge network and the third primary bridge network are connected in parallel at the voltage input end; the first primary bridge network is connected to the primary winding of the first transformer module and the primary winding of the second transformer module via the first primary resonant network; the second primary bridge network is connected to the primary winding of the third transformer module and the primary winding of the fourth transformer module via the second primary resonant network; the third primary bridge network is connected to the primary winding of the fifth transformer module and the primary winding of the sixth transformer module via the third primary resonant network; the phases of the first primary bridge network, the second primary bridge network and the third primary bridge network are staggered by 60 degrees.

7. The three-way full-wave rectified DCDC converter according to claim 6, characterized in that: The first primary resonant network includes a first resonant capacitor and a first resonant inductor; the second primary resonant network includes a second resonant capacitor and a second resonant inductor; the third primary resonant network includes a third resonant capacitor and a third resonant inductor; A first end of the first resonant capacitor is connected to the first output end of the first primary bridge network, and a second end is connected to the first end of the first resonant inductor; a second end of the first resonant inductor is connected to the second output end of the first primary bridge network; a third end of the first resonant inductor is connected to the first end of the primary winding of the first transformer module; a second end of the primary winding of the first transformer module is connected to the first end of the primary winding of the second transformer module; and a second end of the primary winding of the second transformer module is connected to the fourth end of the first resonant inductor; A first end of the second resonant capacitor is connected to the first output end of the second primary bridge network, and a second end is connected to the first end of the second resonant inductor; a second end of the second resonant inductor is connected to the second output end of the second primary bridge network, a third end of the second resonant inductor is connected to the first end of the primary winding of the third transformer module, a second end of the primary winding of the third transformer module is connected to the first end of the primary winding of the fourth transformer module, and a second end of the primary winding of the fourth transformer module is connected to the fourth end of the second resonant inductor; The first end of the third resonant capacitor is connected to the first output end of the third primary bridge network, and the second end is connected to the first end of the third resonant inductor; the second end of the third resonant inductor is connected to the second output end of the third primary bridge network, the third end of the third resonant inductor is connected to the first end of the primary winding of the fifth transformer module, the second end of the primary winding of the fifth transformer module is connected to the first end of the primary winding of the sixth transformer module, and the second end of the primary winding of the sixth transformer module is connected to the fourth end of the third resonant inductor.

8. The three-way full-wave rectified DCDC converter according to claim 7, characterized in that: The first primary-side bridge network, the second primary-side bridge network, and the third primary-side bridge network are respectively switch tube full-bridge networks.

9. The three-way full-wave rectified DCDC converter according to claim 7, characterized in that: The first primary-side bridge network, the second primary-side bridge network, and the third primary-side bridge network are switching tube half-bridge networks respectively.

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