Two-path full-wave rectification DCDC converter
By designing a dual-channel full-wave rectified DC-DC converter and utilizing a parallel and interleaved transformer module structure, the problems of low power, low efficiency, and current sharing in DC-DC converters for new energy vehicles were solved. This achieved current and voltage sharing of capacitors and a reduction in ripple current, reduced the use of filter modules, and lowered the size and cost of the converter.
Patent Information
- Application Number
- CN202423301806.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing DC-DC converters for new energy vehicles have low power and efficiency, narrow battery voltage range, and are prone to current sharing problems when multiple circuits are connected in parallel. Furthermore, they require additional filtering modules, resulting in large size and high cost.
Design a dual-channel full-wave rectified DC-DC converter. By connecting the first primary-side resonant converter module and the second primary-side resonant converter module in parallel, and connecting the primary and secondary windings of the transformer module in series and alternately, and combining the high-low voltage switching module, the output capacitor can achieve current and voltage equalization and reduce ripple current.
It achieves current and voltage equalization of the output capacitor under a wide output range, reduces ripple current, reduces or eliminates the filter module, and reduces the size and cost of the converter.
Smart Images
Figure CN223451841U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of DCDC converters, and more particularly to a two-path full-wave rectified DCDC converter. Background Art
[0002] Currently, most DC-DC converters used in new energy vehicles have low power, low efficiency, and a narrow battery voltage range. To achieve high power output over a wide range, multiple transformer modules must be connected in parallel. However, paralleling multiple transformer modules can easily lead to current sharing issues. Furthermore, to reduce ripple current, current DC-DC converters require dedicated filtering modules on both the input and secondary sides, resulting in larger modules and higher costs. Utility Model Content
[0003] The technical problem to be solved by the present invention is to provide a two-way full-wave rectifier DCDC converter to address the above-mentioned defects of the prior art, which can achieve equal current and voltage of the output capacitors under a wide range of output conditions and reduce ripple current.
[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a two-way full-wave rectifier DCDC converter, including: a first primary side resonant conversion module, a second primary side resonant conversion module, a first transformer module, a second transformer module, a third transformer module, a fourth 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 first output capacitor module, a second output capacitor module, and a high-low voltage switching module;
[0005] The first primary resonant conversion module and the second 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 both 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 both ends of the second primary resonant conversion module; the secondary windings of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are connected in an interlaced manner;
[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, and 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.
[0007] The first end of the first output capacitor module is connected to the third end of the first full-wave rectifier module, the third end of the third full-wave rectifier module and the first end of the high-low voltage switching module respectively; the second end of the first output capacitor module is connected to the second end of the high-low voltage switching module; the first end of the second output capacitor module is connected to the third end of the second full-wave rectifier module, the third end of the fourth 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 module is grounded; and the fourth end of the high-low voltage switching module is grounded.
[0008] The first output capacitor module and the second output capacitor module 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 two-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; and the fourth transformer module comprises a fourth primary winding, a seventh secondary winding and an eighth secondary winding.
[0010] The same end of the first primary winding is connected to the first output end of the first primary side resonant conversion module, and the opposite end is connected to the same end of the second primary winding, and the opposite end of the second primary winding is connected to the second output end of the first primary side resonant conversion module; the same end of the third primary winding is connected to the first output end of the second primary side resonant conversion module, and the opposite end is connected to the same end of the fourth primary winding, and the opposite end of the fourth primary winding is connected to the second output end of the second primary side resonant conversion module.
[0011] The same name end of the first secondary side winding is connected to the first end of the first full-wave rectification module, the opposite name end of the first secondary side winding is connected to the same name end of the fourth secondary side winding, the opposite name end of the fifth secondary side winding and the same name end of the eighth secondary side winding; the same name end of the second secondary side winding is connected to the opposite name end of the third secondary side winding, the same name end of the sixth secondary side winding and the opposite name end of the seventh secondary side winding, and the opposite name end of the second secondary side winding is connected to the first end of the second full-wave rectification module; the same name end of the third secondary side winding is connected to the second end of the second full-wave rectification module, and the opposite name end of the fourth secondary side winding is connected to the second end of the first full-wave rectification module.
[0012] The same name end of the fifth secondary side winding is connected to the first end of the third full-wave rectification module; the opposite name end of the sixth secondary side winding is connected to the first end of the fourth full-wave rectification module; the same name end of the seventh secondary side winding is connected to the second end of the fourth full-wave rectification module, and the opposite name end of the eighth secondary side winding is connected to the second end of the third full-wave rectification module.
[0013] The same name end of the second secondary side winding, the opposite name end of the third secondary side winding, the same name end of the sixth secondary side winding and the opposite name end of the seventh secondary side winding are grounded.
[0014] The two-way full-wave rectification DCDC converter further comprises a first current transformer and a second current transformer; the first current transformer is connected between the second primary side winding and the first primary side resonant conversion module; and the second current transformer is connected between the fourth primary side winding and the second primary side resonant conversion module.
[0015] 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 both connected to the third end of the full-wave rectification module.
[0016] The first output capacitor module comprises a first output capacitor, and the second output capacitor module comprises a second output capacitor.
[0017] The first primary side resonant conversion module comprises a first primary side bridge network and a first primary side resonant network; and the second primary side resonant conversion module comprises a second primary side bridge network and a second primary side resonant network.
[0018] The first primary side bridge network and the second primary side bridge network are connected in parallel at the voltage input end; the first primary side bridge network connects the primary side winding of the first transformer module and the primary side winding of the second transformer module through the first primary side resonant network; the second primary side bridge network connects the primary side winding of the third transformer module and the primary side winding of the fourth transformer module through the second primary side resonant network; the phases of the first primary side bridge network and the second primary side bridge network are staggered by 90 degrees.
[0019] In the two-way full-wave rectification DCDC converter, the first primary side bridge network and the second primary side bridge network comprise a full-bridge network of switching tubes or a half-bridge network of switching tubes.
[0020] In the two-way full-wave rectification DCDC converter, 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;
[0021] The first end of the first resonant capacitor is connected to the first output end of the first primary side bridge network, and the second end is connected to the first end of the first resonant inductor; the second end of the first resonant inductor is connected to the second output end of the first primary side bridge network, the third end of the first resonant inductor is connected to 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 to 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 to the fourth end of the first resonant inductor.
[0022] The first end of the second resonant capacitor is connected to the first output end of the second primary side bridge network, and the second end is connected to the first end of the second resonant inductor; the second end of the second resonant inductor is connected to the second output end of the second primary side bridge network, the third end of the second resonant inductor is connected to 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 to 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 to the fourth end of the second resonant inductor.
[0023] In the two-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 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 is connected to the third end of the high-low voltage switching module.
[0024] The two-way full-wave rectification DCDC converter of the utility model, since the primary winding of the first transformer module and the second transformer module is connected in series and then connected in parallel with the primary winding of the third transformer module and the fourth transformer module, and the secondary winding of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are connected in an interleaved manner, series voltage equalization or parallel current equalization can be realized, and the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are respectively connected with the first full-wave rectification module, the second full-wave rectification module, the third full-wave rectification module and the fourth full-wave rectification module to form four-way full-wave rectification, so that the ripple current can be reduced, and 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 two-way full-wave rectification DCDC converter of the utility model;
[0027] Figure 2 is the circuit diagram of another preferred embodiment of the two-way full-wave rectification DCDC converter of the utility model;
[0028] Figure 3 is the circuit diagram of still another preferred embodiment of the two-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 two-way full-wave rectification DCDC converter of the utility model. As Figure 1 Indicated, a two-way full-wave rectification DCDC converter of the utility model, comprising: first primary side resonant conversion module 110, second primary side resonant conversion module 120, first transformer module 210, second transformer module 220, third transformer module 230, fourth transformer module 240, first full-wave rectification module 310, second full-wave rectification module 320, third full-wave rectification module 330, fourth full-wave rectification module 340, first output capacitor module 410, second output capacitor module 420 and high-low voltage switching module 500. As Figure 1As shown, the first primary side resonant conversion module 110 and the second primary side resonant conversion module 120 are connected in parallel to the voltage input end Vin. The primary side windings of the first transformer module 210 and the second transformer module 220 are connected in series and then connected across the first primary side resonant conversion module 110; the primary side windings of the third transformer module 230 and the fourth transformer module 240 are connected in series and then connected across the second primary side resonant conversion module 120; the secondary side windings of the first transformer module 210, the second transformer module 220, the third transformer module 230 and the fourth transformer module 240 are connected in an interleaved manner.
[0031] The first end of the secondary side winding of the first transformer module 210 is connected to the first end of the first full-wave rectification module 310, and the second end of the secondary side winding of the first transformer module 210 is connected to the first end of the second full-wave rectification module 320; the first end of the secondary side winding of the second transformer module 220 is connected to the second end of the second full-wave rectification module 320, and the second end of the secondary side winding of the second transformer module 220 is connected to the second end of the first full-wave rectification module 310; the first end of the secondary side winding of the third transformer module 230 is connected to the first end of the third full-wave rectification module 330, the second end of the secondary side winding of the third transformer module 230 is connected to the first end of the fourth full-wave rectification module 340, the first end of the secondary side winding of the fourth transformer module 240 is connected to the second end of the fourth full-wave rectification module 340, and the second end of the secondary side winding of the fourth transformer module 240 is connected to the second end of the third full-wave rectification module 330.
[0032] The first end of the first output capacitor module 410 is connected to the third end of the first full-wave rectification module 310, the third end of the third full-wave rectification module 330 and the first end of the high-low voltage switching module 500, respectively; the second end of the first output capacitor module 410 is connected to the second end of the high-low voltage switching module 500; the first end of the second output capacitor module 420 is connected to the third end of the second full-wave rectification module 320, the third end of the fourth full-wave rectification module 340 and the third end of the high-low voltage switching module 500, respectively, and the second end of the second output capacitor module 420 is grounded; the fourth end of the high-low voltage switching module 500 is grounded.
[0033] In an optimal embodiment of the present application, the first primary side resonant conversion module 110 and the second primary side resonant conversion module 120 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 an optimal embodiment of the present application, the first transformer module 210, the second transformer module 220, the third transformer module 230 and the fourth transformer module 240 can be respectively formed by connecting two transformers or multiple transformers in series.
[0035] In an optimal embodiment of the present application, the first full-wave rectification module 310, the second full-wave rectification module 320, the third full-wave rectification module 330 and the fourth full-wave rectification module 340 can also adopt any known full-wave rectification device, such as a diode rectification module. The first output capacitor module 410 and the second output capacitor module 420 can be respectively constructed by corresponding output capacitors.
[0036] In an optimal embodiment of the present application, the high-low voltage switching module 500 can include multiple 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 optimal embodiments of the present application, switching devices such as switch tubes can also be adopted.
[0037] The two-way full-wave rectification DCDC converter of the present application can realize series voltage equalization or parallel current equalization, and the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are respectively connected with the first full-wave rectification module, the second full-wave rectification module, the third full-wave rectification module and the fourth full-wave rectification module to form four-way full-wave rectification, so as to reduce the ripple current, thereby reducing or omitting the filter module, reducing the volume of the converter and reducing the cost.
[0038] Figure 2is another preferred embodiment of the circuit diagram of the two-way full-wave rectification DCDC converter of the utility model. Figures 1-2 It can be known that the two-way full-wave rectification DCDC converter comprises a first primary side resonance conversion module 110, a second primary side resonance conversion module 120, a first transformer module 210, a second transformer module 220, a third transformer module 230, a fourth transformer module 240, a first full-wave rectification module 310, a second full-wave rectification module 320, a third full-wave rectification module 330, a fourth full-wave rectification module 340, a first output capacitor module 410, a second output capacitor module 420 and a high-low voltage switching module 500.
[0039] Further as Figure 2 The first transformer module 210 comprises a transformer T11, and the transformer T11 comprises a first primary side winding N1, a first secondary side winding N12 and a second secondary side winding N13. The second transformer module 220 comprises a transformer T12, and the transformer T12 comprises a second primary side winding N2, a third secondary side winding N22 and a fourth secondary side winding N23. The third transformer module 230 comprises a transformer T21. The fourth transformer module 240 comprises a transformer T22, and the transformer T22 comprises a fourth primary side winding N4, a seventh secondary side winding N42 and an eighth secondary side winding N43.
[0040] It is known to those skilled in the art that the first transformer module 210, the second transformer module 220, the third transformer module 230 and the fourth transformer module 240 can comprise any number of transformers connected in series or in parallel or in any suitable manner so as to meet the requirement that each transformer module comprises one primary side winding and two secondary side windings. The first transformer module 210 comprises a first primary side winding N1, a first secondary side winding N12 and a second secondary side winding N13. The second transformer module 220 comprises a second primary side winding N2, a third secondary side winding N22 and a fourth secondary side winding N23. The third transformer module 230 comprises a third primary side winding N3, a fifth secondary side winding N32 and a sixth secondary side winding N33. The fourth transformer module 240 comprises a fourth primary side winding N4, a seventh secondary side winding N42 and an eighth secondary side winding N43.
[0041] Further as Figure 2As shown, the first full-wave rectification module 310 includes diode D11 and diode D12; the third full-wave rectification module 330 includes diode D13 and diode D14; the second full-wave rectification module 320 includes diode D21 and diode D22; the fourth full-wave rectification module 340 includes diode D23 and diode D24. The first output capacitor module 410 includes output capacitor CH, and the second output capacitor module 420 includes second output capacitor CL. The first primary side resonant conversion module 110 includes a first primary side bridge network and a first primary side resonant network. The second primary side resonant conversion module 210 includes a second primary side bridge network and a second primary side resonant network. As shown in the figure, Figure 2 As shown, the first primary side bridge network includes a switch tube full-bridge network composed of switch tubes Q11-Q14. The first primary side resonant network includes a first resonant capacitor Cr1 and a first resonant inductor Lr1. The second primary side bridge network includes a switch tube full-bridge network composed of switch tubes Q21-Q24. The second primary side resonant network includes a second resonant capacitor Cr2 and a second resonant inductor Lr2. As shown in the figure, 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.
[0042] As shown in the figure, Figure 2 As shown, the switch tubes Q11-Q12 and Q21-Q24 can be MOS tubes, the gates of which respectively receive control signals. The source of switch tube Q11 is connected to the drain of switch tube Q12 and forms a first output end of the first primary side bridge network, the source of switch tube Q13 is connected to the drain of switch tube Q14 and forms a second output end of the first primary side bridge network, the drain of switch tube Q11 is connected to the drain of switch tube Q13 and forms a first input end of the first primary side bridge network, and the source of switch tube Q12 is connected to the source of switch tube Q14 and forms a second input end of the first primary side bridge network. The first input end and the second input end of the first primary side bridge network are connected to the positive and negative poles of the voltage input end Vin. The first end of the first resonant capacitor Cr1 is connected to the first output end of the first primary side bridge network, the second end is connected to the first end of the first resonant inductor Lr1; and the second end of the first resonant inductor Lr1 is connected to the second output end of the first primary side bridge network.
[0043] 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.
[0044] Further as Figure 2 shown, the same end of the first primary side winding N1 is connected with the first output end (i.e. the third end of the first resonant inductor Lr1) of the first primary side resonant conversion module 110, the different end is connected with the same end of the second primary side winding N2, the different end of the second primary side winding N2 is connected with the second output end (i.e. the fourth end of the first resonant inductor Lr1) of the first primary side resonant conversion module 110; the same end of the third primary side winding N3 is connected with the first output end (i.e. the third end of the second resonant inductor Lr2) of the second primary side resonant conversion module 120, the different end is connected with the same end of the fourth primary side winding N4, the different end of the fourth primary side winding N4 is connected with the second output end (i.e. the fourth end of the second resonant inductor Lr2) of the second primary side resonant conversion module 120.
[0045] The same name end of the first secondary winding N12 is connected to the first end of the first full-wave rectifier module 310 (i.e. the anode of diode D11), 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 and the same name end of the eighth secondary winding N43; 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 and the opposite name end of the seventh secondary winding N42, the opposite name end of the second secondary winding N13 is connected to the first end of the second full-wave rectifier module 320 (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 320 (i.e. the anode of diode D22), the opposite name end of the fourth secondary winding N23 is connected to the second end of the first full-wave rectifier module 310 (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 330 (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 340 (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 340 (i.e. the anode of diode D24), the opposite name end of the eighth secondary winding N43 is connected to the second end of the third full-wave rectifier module 330 (i.e. the anode of diode D14). 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 and the opposite name end of the seventh secondary winding N42 are grounded. The cathodes of the diode D11, the diode D12, the diode D13 and the diode D14 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 and the diode D24 are all connected to the first end of the second output capacitor CL and the moving contact of the second switch K2 and the moving contact of the first switch K1. The static contact of the first switch K1 and the second end of the first output capacitor CH are connected to the opposite name end of the first secondary winding N12, the same name end of the fourth secondary winding N23, the opposite name end of the fifth secondary winding N32 and the same name end of the eighth secondary winding N43. The moving contact of the third switch K3 is grounded and the static contact is connected to the static 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.
[0046] In Figure 2In the preferred implementation shown, a first current transformer CT1 and a second current transformer CT2 are further included; 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.
[0047] In Figure 2In the preferred embodiment shown, switches Q11-Q14 and transformers T11 and T22 form a first resonant circuit; switches Q21-Q24 and transformers T21 and T22 form a second resonant circuit. The control signals for switches Q11-Q14 are 90° phase-interleaved with those for switches Q21-Q24. In the first resonant circuit, the first secondary winding N12 of transformer T11 is connected in series with the fourth secondary winding N23 of transformer T12. The opposite-signal terminal of the first secondary winding N12 of transformer T11 is connected in series with the same-signal terminal of the fourth secondary winding N23 of transformer T12, forming a full-wave rectifier circuit that supplies power to the first output capacitor CH. The same-signal terminal of the second secondary winding N13 of transformer T11 is connected in series with the opposite-signal terminal of the third secondary winding N22 of transformer T12, forming a full-wave rectifier circuit that supplies power to the second output capacitor CL. Similarly, the opposite-name terminal of the fifth secondary winding N32 of transformer T21 is connected in series with the same-name terminal of the eighth secondary winding N43 of transformer T22, forming a full-wave rectifier to supply power to the first output capacitor CH. The same-name terminal of the sixth secondary winding N33 of transformer T21 is connected in series with the opposite-name terminal of the seventh secondary winding N42 of transformer T22, forming a full-wave rectifier to supply power to the second output capacitor CL. Therefore, the first output capacitor CH is charged by the first secondary winding N12 of transformer T11 and the fourth secondary winding N23 of transformer T12 in the first resonant circuit, and the opposite-name terminal of the fifth secondary winding N32 of transformer T21 and the eighth secondary winding N433 of transformer T22 in the second resonant circuit, achieving a 90° staggered ripple current and reducing the ripple current of the electrolytic capacitor. Similarly, by charging the second output capacitor CL through the second secondary winding N13 of the transformer T11 of the first resonant circuit, the third secondary winding N22 of the transformer T12, and the sixth secondary winding N33 of the transformer T21 in the second resonant short circuit and the seventh secondary winding N42 of the transformer T22, the ripple current can be staggered by 90 degrees, reducing the ripple current of the electrolytic capacitor. Furthermore, the primary windings of the transformers T11, T21, T21, and T22 are connected in parallel, and half of the secondary windings charge the first output capacitor CH, while the other symmetrical set of windings supplies power to the second output capacitor CL. Therefore, when the high-low voltage control switching module switches so that the first output capacitor CH and the second output capacitor CL are connected in series, the charging voltage is consistent to achieve uniform series connection; similarly, when the high-low voltage control switching module switches so that the first output capacitor CH and the second output capacitor CL are connected in parallel, the two resonant circuits are connected in parallel to achieve current sharing.
[0048] Figure 3 This is a circuit diagram of another preferred embodiment of the two-way full-wave rectifier DCDC converter of the present invention. Figure 3 The embodiment shown is actually the same as Figure 2 Similar, the difference is that, Figure 2As shown, the first primary side bridge network includes a switch tube half-bridge network composed of switch tubes Q11-Q12.The second primary side bridge network includes a switch tube half-bridge network composed of switch tubes Q21-Q22.The corresponding first primary side resonance network includes a first resonance capacitor Cr1 and a first resonance inductor Lr1.The second primary side resonance network includes a second resonance capacitor Cr2 and a second resonance inductor Lr2, and their connection relationship is as shown. Figure 3 The working process, principle and beneficial effects are similar to those of the embodiment shown in Figure 2 As shown in the embodiment, based on the common knowledge and Figure 2 The working process, principle and beneficial effects are similar to those of the embodiment shown in Figure 3 The working process, principle and beneficial effects are similar to those of the embodiment shown in
[0049] The two-way full-wave rectification DCDC converter of the utility model, since the primary winding of the first transformer module and the second transformer module is connected in series and then connected in parallel with the primary winding of the third transformer module and the fourth transformer module, and the secondary winding of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are connected in an interleaved manner, series voltage equalization or parallel current equalization can be realized, and the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are respectively connected with a first full-wave rectification module, a second full-wave rectification module, a third full-wave rectification module and a fourth full-wave rectification module to form four-way full-wave rectification, so that the ripple current can be reduced, and the filter module can be reduced or omitted, thereby reducing the size of the converter and reducing the cost.
[0050] Although the utility model is described through specific embodiments, those skilled in the art should understand that various transformations and equivalent substitutions of the utility model can be made without departing from the scope of the utility model.In addition, various modifications can be made to the utility model for specific situations or materials 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.
[0051] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent substitution and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model. The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent substitution and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A two-way full-wave rectifier DCDC converter, characterized in that: include: A first primary resonant conversion module, a second primary resonant conversion module, a first transformer module, a second transformer module, a third transformer module, a fourth 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 first output capacitor module, a second output capacitor module, and a high-low voltage switching module; The first primary resonant conversion module and the second 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 both 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 both ends of the second primary resonant conversion module; the secondary windings of the first transformer module, the second transformer module, the third transformer module and the fourth transformer module are connected in an interlaced manner; 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, and 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 first output capacitor module is respectively connected to the third end of the first full-wave rectifier module, the third end of the third full-wave rectifier module, and the first end of the high-low voltage switching module; the second end of the first output capacitor module is connected to the second end of the high-low voltage switching module; the first end of the second output capacitor module is respectively connected to the third end of the second full-wave rectifier module, the third end of the fourth full-wave rectifier module, and the third end of the high-low voltage switching module, the second end of the second output capacitor module is grounded; the fourth end of the high-low voltage switching module is grounded; The first output capacitor module and the second output capacitor module 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 two-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 same-name end of the first primary winding is connected to the first output terminal 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 terminal of the first primary resonant conversion module; the same-name end of the third primary winding is connected to the first output terminal 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 terminal of the second 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, and the same-name end of the eighth 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, and the opposite-name end of the seventh 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 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, and 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 second secondary winding, the opposite-name end of the third secondary winding, the same-name end of the sixth secondary winding, and the opposite-name end of the seventh secondary winding are grounded.
3. The two-way full-wave rectified DCDC converter according to claim 2, characterized in that: It further includes a first current transformer and a second 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.
4. The two-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.
5. The two-way full-wave rectified DCDC converter according to claim 2, characterized in that: The first output capacitor module includes a first output capacitor, and the second output capacitor module includes a second output capacitor.
6. The two-way full-wave rectified DCDC converter according to any one of claims 1 to 5, characterized in that: The first primary side resonant conversion module includes a first primary side bridge network and a first primary side resonant network; the second primary side resonant conversion module includes a second primary side bridge network and a second primary side resonant network; The first primary bridge network and the second 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 phases of the first primary bridge network and the second primary bridge network are staggered by 90 degrees.
7. The two-way full-wave rectified DCDC converter according to claim 6, characterized in that: The first primary-side bridge network and the second primary-side bridge network include a switch tube full-bridge network or a switch tube half-bridge network.
8. The two-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; 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; The first end of the second resonant capacitor is connected to the first output end of the second primary bridge network, and the second end is connected to the first end of the second resonant inductor; the second end of the second resonant inductor is connected to the second output end of the second primary bridge network, the third end of the second resonant inductor is connected to the first end of the primary winding of the third transformer module, the 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 the second end of the primary winding of the fourth transformer module is connected to the fourth end of the second resonant inductor.
9. The two-way full-wave rectified DCDC converter according to any one of claims 1 to 5, 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.