Bidirectional isolation DC-DC charging module topological structure

Abstract

The utility model discloses a bidirectional isolation DC-DC charging module topological structure, which belongs to the technical field of charging circuits and comprises a DC bus, a first voltage stabilization module, a second voltage stabilization module, a first inversion module, a resonance circuit, a second inversion module and a transformer. The input end of the first voltage stabilizing module is electrically connected with the direct-current bus, the output end of the first voltage stabilizing module is electrically connected with the input end of the second voltage stabilizing module, and the output end of the second voltage stabilizing module is electrically connected with the direct-current bus. Through the above mode, the high-voltage peak problem on the switch tube is solved.

Description

Technical Field

[0001] This utility model relates to the field of charging circuit technology, specifically to a bidirectional isolated DC-DC charging module topology. Background Technology

[0002] In the prior art, there is a widely used isolated bidirectional DC-DC converter topology that inverts the input DC voltage into AC voltage, and then transforms and rectifies it into an output DC voltage through a transformer.

[0003] However, this topology is not suitable for high-power applications because leakage inductance energy storage and discharge can cause high-voltage spikes in the switching MOSFET.

[0004] Based on this, the present invention designs a bidirectional isolated DC-DC charging module topology to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a bidirectional isolated DC-DC charging module topology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A bidirectional isolated DC-DC charging module topology includes a DC bus, a voltage regulator module one, a voltage regulator module two, an inverter module one, a resonant circuit, an inverter module two, and a transformer;

[0008] The input terminal of voltage regulator module one is electrically connected to the DC bus, the output terminal of voltage regulator module one is electrically connected to the input terminal of voltage regulator module two, and the output terminal of voltage regulator module two is electrically connected to the DC bus.

[0009] The output terminals of inverter module one and voltage regulator module one are electrically connected. Inverter module one is electrically connected to the resonant circuit and the transformer. The resonant circuit is electrically connected to one side of the transformer. The other side of the transformer is electrically connected to inverter module two. Inverter module two is electrically connected to the battery.

[0010] The voltage regulator module one and voltage regulator module two have the same circuit structure but opposite input and output voltage directions.

[0011] Furthermore, the voltage regulator module includes capacitor C1, capacitor C2, inductor L1, switching transistor S1, switching transistor S2, switching transistor S3, and switching transistor S4.

[0012] The switching transistors S1 and S2 are connected in series and then in parallel with capacitor C1. The switching transistors S3 and S4 are connected in series and then in parallel with C2. Switches S1 and S3 are electrically connected, and switches S2 and S4 are electrically connected. One end of inductor L1 is electrically connected to the series connection of switches S1 and S2, and the other end of inductor L1 is electrically connected to the series connection of switches S3 and S4.

[0013] Both ends of capacitor C1 are electrically connected to the DC bus, both ends of capacitor C2 are electrically connected to the input terminal of voltage regulator module 2, and both ends of capacitor C2 are electrically connected to inverter module 1.

[0014] Furthermore, the second voltage regulator module includes capacitor C3, capacitor C4, inductor L2, switching transistor S5, switching transistor S6, switching transistor S7, and switching transistor S8;

[0015] The switching transistors S5 and S6 are connected in series and then in parallel with capacitor C3. The switching transistors S7 and S8 are connected in series and then in parallel with C4. Switches S5 and S7 are electrically connected, and switches S6 and S8 are electrically connected. One end of inductor L2 is electrically connected to the series connection of switches S7 and S8, and the other end of inductor L2 is electrically connected to the series connection of switches S5 and S6.

[0016] The two ends of capacitor C2 are connected in parallel with the two ends of capacitor C3, and the two ends of capacitor C4 are electrically connected to the DC bus.

[0017] Furthermore, the inverter module includes a capacitor C5, a switch S9, a switch S10, a switch S11, and a switch S12.

[0018] The two ends of capacitor C5 are connected in parallel with the two ends of capacitor C2. Switches S9 and S10 are connected in series and then in parallel with capacitor C5. Switches S11 and S12 are connected in series. Switches S11 and S9 are electrically connected. Switches S12 and S10 are electrically connected. The series connection of switches S9 and S10 is electrically connected to the resonant circuit (5). The series connection of switches S11 and S12 is electrically connected to the resonant circuit (5) and the transformer.

[0019] Furthermore, the resonant circuit includes inductor L3, inductor L4, switch J, and capacitor C6;

[0020] The inductor L4, switch J, inductor L3, and capacitor C6 are connected in series. The inductor L4 is electrically connected to the series connection of switch S11 and switch S12. The series connection of switch S11 and switch S12 is electrically connected to the transformer. The series connection of switch J and inductor L3 is electrically connected to the series connection of switch S9 and switch S10. The capacitor C6 and inductor L4 are respectively electrically connected to the same-name terminal and the opposite-name terminal of the primary winding of the transformer.

[0021] Furthermore, the second inverter module includes a capacitor C7, a switching transistor S13, a switching transistor S14, a switching transistor S15, and a switching transistor S16.

[0022] The switching transistors S13 and S14 are connected in series, and the switching transistors S15 and S16 are connected in series and then in parallel with capacitor C7. Switches S13 and S15 are electrically connected, and switches S14 and S16 are electrically connected. The connection point of the series connection of switches S13 and S14 is electrically connected to the same-name terminal of the secondary winding of the transformer, and the connection point of the series connection of switches S15 and S16 is electrically connected to the opposite-name terminal of the secondary winding of the transformer. The two ends of capacitor C7 are electrically connected to the battery.

[0023] Furthermore, the switching transistor is selected from MOSFETs.

[0024] Furthermore, the switching transistor is selected as an IGBT.

[0025] Compared with the prior art, the advantages of this utility model are as follows: 1. When the battery supplies power to the DC bus, the voltage regulator module one outputs a stable voltage through the voltage regulator module two. V 1；

[0026] When power is supplied to the battery from the DC bus via voltage regulator module one, voltage regulator module two outputs a stable voltage. V 2 Supply to DC bus;

[0027] The inverter module uses resonance to achieve zero-current switching, thus effectively solving the problem of high-voltage spikes on the switching transistor;

[0028] When powered by the DC bus, energy flows in the forward direction. Inverter module 1 is the DC input terminal, and inverter module 2 is the DC output terminal to charge the battery. When the battery supplies power in the reverse direction, energy flows in the reverse direction. Inverter module 2 is the DC input terminal, and inverter module 2 is the DC output terminal.

[0029] 2. The advantage of configuring voltage regulator module one and voltage regulator module two is that they can achieve high efficiency and high power density in bidirectional operation, especially in this type of bus battery interface application;

[0030] 3. When energy flows in the forward direction, switch J is open, and when energy flows in the reverse direction, switch J is closed, and inductor L4 is clamped, thereby effectively increasing the output voltage range and achieving wide voltage range output. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a circuit diagram of a bidirectional isolated DC-DC charging module topology according to the present invention;

[0033] Figure 2 The circuit diagram is for an existing isolated bidirectional DC-DC converter topology.

[0034] The labels in the diagram represent:

[0035] 1. DC bus; 2. Voltage regulator module one; 3. Voltage regulator module two; 4. Inverter module one; 5. Resonant circuit; 6. Inverter module two; 7. Transformer. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0037] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-2 A bidirectional isolated DC-DC charging module topology includes a DC bus 1, a voltage regulator module 1 2, a voltage regulator module 2 3, an inverter module 1 4, a resonant circuit 5, an inverter module 2 6, and a transformer 7.

[0038] The input terminal of voltage regulator module 2 is electrically connected to DC bus 1, the output terminal of voltage regulator module 2 is electrically connected to the input terminal of voltage regulator module 3, and the output terminal of voltage regulator module 3 is electrically connected to DC bus 1.

[0039] Inverter module 1 4 is electrically connected to the output terminal of voltage regulator module 1 2. Inverter module 1 4 is electrically connected to resonant circuit 5 and transformer 7. Resonant circuit 5 is electrically connected to one side of transformer 7. The other side of transformer 7 is electrically connected to inverter module 2 6. Inverter module 2 6 is electrically connected to the battery.

[0040] The circuit structures of voltage regulator module 1 (2) and voltage regulator module 2 (3) are the same, but the input and output voltage directions are opposite.

[0041] When this invention is in use, the voltage regulator module 2 outputs a stable voltage when the DC bus 1 is powered by the battery, through the voltage regulator module 3. V 1；

[0042] When power is supplied to the battery from DC bus 1 via voltage regulator module 2, voltage regulator module 3 outputs a stable voltage. V 2 DC bus 1 is supplied;

[0043] Inverter module 14 uses resonance to achieve zero-current switching, thus effectively solving the problem of high-voltage spikes on the switching transistor;

[0044] When powered by DC bus 1, energy flows in the forward direction. Inverter module 1 4 is the DC input terminal, and inverter module 2 6 is the DC output terminal to charge the battery. When the battery supplies power in the reverse direction, energy flows in the reverse direction. Inverter module 2 6 is the DC input terminal, and inverter module 1 4 is the DC output terminal.

[0045] The equivalent circuit of resonant circuit 5 is a multi-element resonant circuit when energy flows in both directions. It can achieve soft switching in both directions with low loss, which solves the problem of low reverse gain in traditional LLC resonant circuits. It can also boost the voltage when energy flows in the reverse direction, which can effectively improve the output voltage range of the converter and achieve wide voltage range output, making it suitable for high-power circuits.

[0046] The voltage regulator module 2 includes capacitor C1, capacitor C2, inductor L1, switching transistor S1, switching transistor S2, switching transistor S3 and switching transistor S4;

[0047] Switches S1 and S2 are connected in series and then in parallel with capacitor C1. Switches S3 and S4 are connected in series and then in parallel with capacitor C2. Switches S1 and S3 are electrically connected, and switches S2 and S4 are electrically connected. One end of inductor L1 is electrically connected to the series connection of switches S1 and S2, and the other end of inductor L1 is electrically connected to the series connection of switches S3 and S4.

[0048] Both ends of capacitor C1 are electrically connected to DC bus 1, both ends of capacitor C2 are electrically connected to the input terminal of voltage regulator module 3, and both ends of capacitor C2 are electrically connected to inverter module 4.

[0049] The voltage regulator module 2 includes capacitor C3, capacitor C4, inductor L2, switching transistor S5, switching transistor S6, switching transistor S7 and switching transistor S8;

[0050] Switches S5 and S6 are connected in series and then in parallel with capacitor C3. Switches S7 and S8 are connected in series and then in parallel with capacitor C4. Switches S5 and S7 are electrically connected, and switches S6 and S8 are electrically connected. One end of inductor L2 is electrically connected to the series connection of switches S7 and S8, and the other end of inductor L2 is electrically connected to the series connection of switches S5 and S6.

[0051] The two ends of capacitor C2 are connected in parallel with the two ends of capacitor C3, and the two ends of capacitor C4 are electrically connected to DC bus 1.

[0052] Inverter module 4 includes capacitor C5, switching transistor S9, switching transistor S10, switching transistor S11 and switching transistor S12;

[0053] The two ends of capacitor C5 are connected in parallel with the two ends of capacitor C2. Switches S9 and S10 are connected in series and then in parallel with capacitor C5. Switches S11 and S12 are connected in series. Switches S11 and S9 are electrically connected. Switches S12 and S10 are electrically connected. The series connection of switches S9 and S10 is electrically connected to resonant circuit 5. The series connection of switches S11 and S12 is electrically connected to resonant circuit 5 and transformer 7.

[0054] The resonant circuit 5 includes inductor L3, inductor L4, switch J, and capacitor C6;

[0055] Inductor L4, switch J, inductor L3, and capacitor C6 are connected in series. Inductor L4 is electrically connected to the series connection of switch transistors S11 and S12. The series connection of switch transistors S11 and S12 is electrically connected to transformer 7. The series connection of switch J and inductor L3 is electrically connected to the series connection of switch transistors S9 and S10. Capacitor C6 and inductor L4 are electrically connected to the same-name terminal and the opposite-name terminal of the primary winding of transformer 7, respectively.

[0056] Inverter module 26 includes capacitor C7, switching transistor S13, switching transistor S14, switching transistor S15 and switching transistor S16;

[0057] Switches S13 and S14 are connected in series, and switches S15 and S16 are connected in series and then in parallel with capacitor C7. Switches S13 and S15 are electrically connected, and switches S14 and S16 are electrically connected. The connection point of switches S13 and S14 is electrically connected to the same-name terminal of the secondary winding of transformer 7, and the connection point of switches S15 and S16 is electrically connected to the opposite-name terminal of the secondary winding of transformer 7. The two ends of capacitor C7 are electrically connected to the battery.

[0058] The switching transistor can be either a MOSFET or an IGBT;

[0059] The advantage of the configuration of voltage regulator module 12 and voltage regulator module 23 is that it can achieve high efficiency and high power density in bidirectional operation, especially in this type of bus battery interface application.

[0060] When energy flows in the forward direction, switch J is open, and when energy flows in the reverse direction, switch J is closed, and inductor L4 is clamped, thereby effectively increasing the output voltage range and achieving wide voltage range output.

[0061] When using this utility model, the voltage regulation module 3 will be regulated. V 2 The voltage of DC bus 1 is set to be relatively low, lower than the rated DC bus 1 voltage most of the time, but still able to support the DC bus 1 load. In this configuration, the voltage of DC bus 1 is higher than the voltage regulated by voltage regulator module 3 most of the time. V 2 The voltage regulator module 2 only consumes no-load power.

[0062] Meanwhile, when DC bus 1 is charging the battery through voltage regulator module 2, and the voltage of DC bus 1 suddenly disappears, voltage regulator module 3 will immediately start working, and current will flow through voltage regulator module 3 to support DC bus 1.

[0063] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bidirectional isolated DC-DC charging module topology, characterized in that: It includes a DC bus (1), voltage regulator module one (2), voltage regulator module two (3), inverter module one (4), resonant circuit (5), inverter module two (6) and transformer (7); The input terminal of the voltage regulator module 1 (2) is electrically connected to the DC bus (1), the output terminal of the voltage regulator module 1 (2) is electrically connected to the input terminal of the voltage regulator module 2 (3), and the output terminal of the voltage regulator module 2 (3) is electrically connected to the DC bus (1). The output terminal of inverter module 1 (4) is electrically connected to the output terminal of voltage regulator module 1 (2). Inverter module 1 (4) is electrically connected to resonant circuit (5) and transformer (7). Resonant circuit (5) is electrically connected to one side of transformer (7). The other side of transformer (7) is electrically connected to inverter module 2 (6). Inverter module 2 (6) is electrically connected to battery. The voltage regulator module 1 (2) and voltage regulator module 2 (3) have the same circuit structure but opposite input and output voltage directions.

2. The bidirectional isolated DC-DC charging module topology according to claim 1, characterized in that, The voltage regulator module (2) includes capacitor C1, capacitor C2, inductor L1, switching transistor S1, switching transistor S2, switching transistor S3 and switching transistor S4; The switching transistors S1 and S2 are connected in series and then in parallel with capacitor C1. The switching transistors S3 and S4 are connected in series and then in parallel with C2. Switches S1 and S3 are electrically connected, and switches S2 and S4 are electrically connected. One end of inductor L1 is electrically connected to the series connection of switches S1 and S2, and the other end of inductor L1 is electrically connected to the series connection of switches S3 and S4. Both ends of capacitor C1 are electrically connected to the DC bus (1), both ends of capacitor C2 are electrically connected to the input terminal of voltage regulator module 2 (3), and both ends of capacitor C2 are electrically connected to inverter module 1 (4).

3. The bidirectional isolated DC-DC charging module topology according to claim 2, characterized in that, The voltage regulator module 2 (3) includes capacitor C3, capacitor C4, inductor L2, switching transistor S5, switching transistor S6, switching transistor S7 and switching transistor S8; The switching transistors S5 and S6 are connected in series and then in parallel with capacitor C3. The switching transistors S7 and S8 are connected in series and then in parallel with C4. Switches S5 and S7 are electrically connected, and switches S6 and S8 are electrically connected. One end of inductor L2 is electrically connected to the series connection of switches S7 and S8, and the other end of inductor L2 is electrically connected to the series connection of switches S5 and S6. The two ends of capacitor C2 are connected in parallel with the two ends of capacitor C3, and the two ends of capacitor C4 are electrically connected to the DC bus (1).

4. The bidirectional isolated DC-DC charging module topology according to claim 3, characterized in that, The inverter module (4) includes capacitor C5, switch S9, switch S10, switch S11 and switch S12; The two ends of capacitor C5 are connected in parallel with the two ends of capacitor C2. Switch S9 and switch S10 are connected in series and then in parallel with capacitor C5. Switch S11 and switch S12 are connected in series. Switch S11 is electrically connected to switch S9. Switch S12 is electrically connected to switch S10. The series connection of switch S9 and switch S10 is electrically connected to resonant circuit (5). The series connection of switch S11 and switch S12 is electrically connected to resonant circuit (5) and transformer (7).

5. The bidirectional isolated DC-DC charging module topology according to claim 4, characterized in that, The resonant circuit (5) includes inductor L3, inductor L4, switch J and capacitor C6; The inductor L4, switch J, inductor L3, and capacitor C6 are connected in series. The inductor L4 is electrically connected to the series connection of switch S11 and switch S12. The series connection of switch S11 and switch S12 is electrically connected to transformer (7). The series connection of switch J and inductor L3 is electrically connected to the series connection of switch S9 and switch S10. The capacitor C6 and inductor L4 are respectively electrically connected to the same-name terminal and the opposite-name terminal of the primary winding of transformer (7).

6. The bidirectional isolated DC-DC charging module topology according to claim 5, characterized in that, The inverter module 2 (6) includes capacitor C7, switch S13, switch S14, switch S15 and switch S16; The switching transistors S13 and S14 are connected in series, and the switching transistors S15 and S16 are connected in series and then in parallel with the capacitor C7. The switching transistors S13 and S15 are electrically connected, and the switching transistors S14 and S16 are electrically connected. The connection point of the series connection of the switching transistors S13 and S14 is electrically connected to the same-name terminal of the secondary winding of the transformer (7), and the connection point of the series connection of the switching transistors S15 and S16 is electrically connected to the opposite-name terminal of the secondary winding of the transformer (7). The two ends of the capacitor C7 are electrically connected to the battery.

7. The bidirectional isolated DC-DC charging module topology according to any one of claims 2-6, characterized in that, The switching transistor is a MOSFET.

8. The bidirectional isolated DC-DC charging module topology according to any one of claims 2-6, characterized in that, The switching transistor is an IGBT.

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