Modularized bidirectional DC-DC conversion device and instrument

Abstract

The utility model relates to the technical field of electrical engineering, in particular to a modularized bidirectional DC-DC conversion device and instrument, which comprises a human-computer interaction interface, a main control module, an optical fiber communication expansion module and a plurality of groups of DC-DC module units, the man-machine interaction interface communicates with the main control module through a signal bus to realize parameter setting and state monitoring of the modularized bidirectional DC-DC conversion device; and the main control module communicates with the plurality of groups of DC-DC module units through the optical fiber communication expansion module so as to realize parameter setting and state monitoring of the plurality of groups of DC-DC module units. The bidirectional DC-DC conversion device provided by the utility model is simple in structure and good in capacity expansion capability, and meanwhile, the bidirectional DC-DC conversion device adopts a modular design, so that the capacity expansion of the bidirectional DC-DC conversion device is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical engineering, in particular to a modular bidirectional DC-DC conversion device. Background Art

[0002] Bidirectional DC-DC converters are widely used in the fields of electric vehicles, renewable energy, and power storage. Bidirectional DC-DC converters are advanced power electronic devices that have high efficiency, high reliability, high flexibility, and high stability, and are suitable for application requirements in various scenarios. With the continuous development of power electronics technology, the application prospects of bidirectional DC-DC converters will be broader.

[0003] Currently, traditional bidirectional DC-DC converters have complex circuit structures, poor expansion capabilities, and low cost-performance.

[0004] Therefore, in the field of electrical engineering technology, it is very important to provide a bidirectional DC-DC converter with a simple structure and good expansion capability. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a modular bidirectional DC-DC conversion device. The bidirectional DC-DC conversion device of the present invention has a simple structure and good expansion capability. At the same time, the present invention adopts a modular design to facilitate the expansion of the bidirectional DC-DC conversion device.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] In a first aspect, a modular bidirectional DC-DC conversion device is provided, wherein the modular bidirectional DC-DC conversion device comprises a human-machine interaction interface, a main control module, an optical fiber communication extension module and a plurality of DC-DC module units; wherein:

[0008] The human-machine interaction interface communicates with the main control module via a signal bus to achieve parameter setting and status monitoring of the modular bidirectional DC-DC converter;

[0009] The main control module communicates with the multiple groups of DC-DC module units through the optical fiber communication expansion module to achieve parameter setting and status monitoring of the multiple groups of DC-DC module units.

[0010] Preferably, the plurality of groups of DC-DC module units include a BUCK / BOOST conversion main circuit, a first current detection module, a first voltage detection module, a second current detection module, a second voltage detection module, a pre-charging circuit and a DC-DC control module; wherein,

[0011] One end of the BUCK / BOOST conversion main circuit is connected to the high-voltage DC side of the DC-DC module unit, and the other end of the BUCK / BOOST conversion main circuit is connected to the pre-charging circuit;

[0012] The first current detection module is connected to the high-voltage DC side of the DC-DC module unit, and the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit; the second current detection module is connected to the low-voltage DC side of the DC-DC module unit, and the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit;

[0013] One end of the pre-charging circuit is connected to the BUCK / BOOST conversion main circuit, and the other end of the pre-charging circuit is connected to the low-voltage DC side of the DC-DC module unit;

[0014] The DC-DC control module is connected to the first current detection module, the first voltage detection module, the second current detection module, and the second voltage detection module respectively.

[0015] Preferably, the BUCK / BOOST conversion main circuit includes capacitor CH, capacitor CL, inductor L1, inductor L2, inductor L3, IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6 and resistor RL; wherein,

[0016] One end of the capacitor CH is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, and the other end of the capacitor CH is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0017] The capacitor CL is connected in parallel with the resistor RL, one end of the capacitor CL is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the capacitor CL is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0018] The collector of the IGBT1 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT1 is connected to the collector of the IGBT2, and the emitter of the IGBT2 is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0019] The collector of the IGBT3 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT3 is connected to the collector of the IGBT4, and the emitter of the IGBT4 is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0020] The collector of the IGBT5 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT5 is connected to the collector of the IGBT6, and the emitter of the IGBT6 is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0021] One end of the inductor L1 is connected to the emitter of the IGBT1, and the other end of the inductor L1 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit;

[0022] One end of the inductor L2 is connected to the emitter of the IGBT3, and the other end of the inductor L2 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit;

[0023] One end of the inductor L3 is connected to the emitter of the IGBT5, and the other end of the inductor L3 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit.

[0024] Preferably, the pre-charging circuit includes KM1, KM2 and a resistor RC; wherein,

[0025] One end of the resistor RC is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the resistor RC is connected to the positive electrode L_DC_BUS+ on the low-voltage DC side through KM2; one end of the KM1 is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the KM1 is connected to the positive electrode L_DC_BUS+ on the low-voltage DC side.

[0026] Preferably, the first current detection module is connected to the high-voltage DC side of the DC-DC module unit, and is used to detect the current on the high-voltage DC side; the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit, and is used to detect the voltage on the high-voltage DC side.

[0027] Preferably, the second current detection module is connected to the low-voltage DC side of the DC-DC module unit, and is used to detect the current on the low-voltage DC side; the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit, and is used to detect the voltage on the low-voltage DC side.

[0028] Preferably, the fiber optic communication extension module includes a dual-channel output driver, a high-performance fiber optic receiver and a high-performance fiber optic transmitter.

[0029] Preferably, the signal input port TX is connected to the first pin of the dual-channel output driver, the second pin of the dual-channel output driver is connected to the power supply +5V, one end of the resistor R1 is connected to the power supply +5V, the other end of the resistor R1 is connected to the third pin of the dual-channel output driver and the second pin of the high-performance optical fiber transmitter, one end of the resistor R2 is connected to the power supply +5V, the other end of the resistor R2 is connected to the first pin of the high-performance optical fiber transmitter, and the signal output port RX is connected to the fifth pin of the dual-channel output driver; capacitor C2 is connected in parallel with capacitor C3, one end of capacitor C3 is connected to the third pin of the high-performance optical fiber receiver and the power supply +5V, and the other end of capacitor C3 is connected to the second pin of the high-performance optical fiber receiver and the power ground GND; one end of capacitor C1 is connected to the eighth pin of the dual-channel output driver and the power supply +5V, and the other end of capacitor C1 is connected to the fourth pin of the dual-channel output driver and the power ground GND.

[0030] Preferably, a plurality of groups of the DC-DC module units are arranged in parallel.

[0031] In a second aspect, a modular bidirectional DC-DC conversion instrument is provided, comprising the modular bidirectional DC-DC conversion device described in the utility model.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] The modular bidirectional DC-DC converter provided by the utility model includes a human-machine interaction interface, a main control module, an optical fiber communication expansion module and a DC-DC module unit, which has not only a simple structure but also good expansion capability. At the same time, the utility model adopts a modular design, which can facilitate the expansion of the bidirectional DC-DC converter.

[0034] The utility model uses IGBT as a switching device, and realizes the rise and fall of DC voltage and bidirectional flow by controlling its on and off time. At the same time, the BUCK / BOOST conversion main circuit is a full-bridge topology composed of IGBT1, IGBT2, IGBT3, IGBT4, IGBT5 and IGBT6. The use of this full-bridge topology structure can reduce the current stress of the switching device, thereby improving the reliability of the modular bidirectional DC-DC conversion device.

[0035] In addition, the modular bidirectional DC-DC conversion device provided by the utility model also has the advantages of high efficiency, high reliability, and high power density, can achieve precise control of output voltage and current, and can improve the stability of the modular bidirectional DC-DC conversion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following will be combined with specific implementations and examples to specifically explain the present invention, and the advantages and various effects of the present invention will be more clearly presented. It should be understood by those skilled in the art that these specific implementations and examples are used to illustrate the present invention, rather than to limit the present invention.

[0037] Throughout the specification, unless otherwise specified, the terms used herein should be understood as the meanings commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which the utility model belongs. In the event of a conflict, this specification takes precedence.

[0038] In the description of the present invention, the terms "first", "second", "third", etc. are only used to distinguish multiple similar elements, and are not intended to indicate any differences in importance or order between the elements; moreover, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying the number of the indicated technical features; thus, the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features.

[0039] Figure 1 A system block diagram of a modular bidirectional DC-DC converter provided by an embodiment of the utility model;

[0040] Figure 2 A main circuit diagram of a DC-DC module unit provided in an embodiment of the utility model;

[0041] Figure 3 A one-way optical transmission / receiving circuit diagram of an optical fiber communication extension module provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0042] Reference Figure 1 The system block diagram of the modular bidirectional DC-DC converter provided by the embodiment of the utility model is shown; Figure 2 The main circuit diagram of the DC-DC module unit provided by the embodiment of the utility model is shown; Figure 3 A light transmitting / receiving circuit diagram of a fiber optic communication extension module provided by an embodiment of the utility model is shown.

[0043] Reference Figure 1 As shown, the modular bidirectional DC-DC conversion device provided by the embodiment of the utility model includes a human-machine interaction interface HMI, a main control module, an optical fiber communication extension module and a plurality of DC-DC module units; wherein,

[0044] The human-machine interface HMI communicates with the main control module via a signal bus to achieve parameter setting and status monitoring of the modular bidirectional DC-DC converter;

[0045] The main control module communicates with the multiple groups of DC-DC module units through the optical fiber communication extension module to achieve parameter setting and status monitoring of the multiple groups of DC-DC module units.

[0046] Reference Figure 2 As shown, the main circuit diagram of the DC-DC module unit provided by the embodiment of the utility model includes a BUCK / BOOST conversion main circuit, a first current detection module, a first voltage detection module, a second current detection module, a second voltage detection module, a pre-charging circuit and a DC-DC control module; wherein,

[0047] One end of the BUCK / BO0ST conversion main circuit is connected to the high voltage DC side of the DC-DC module unit, and the other end of the BUCK / BO0ST conversion main circuit is connected to the pre-charging circuit;

[0048] The first current detection module is connected to the high-voltage DC side of the DC-DC module unit, and the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit; the second current detection module is connected to the low-voltage DC side of the DC-DC module unit, and the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit;

[0049] One end of the pre-charging circuit is connected to the BUCK / BOOST conversion main circuit, and the other end of the pre-charging circuit is connected to the low-voltage DC side of the DC-DC module unit;

[0050] The DC-DC control module is connected to the first current detection module, the first voltage detection module, the second current detection module, and the second voltage detection module respectively.

[0051] Also refer to Figure 2 As shown, the BUCK / BOOST conversion main circuit includes capacitor CH, capacitor CL, inductor L1, inductor L2, inductor L3, IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6 and resistor RL; wherein,

[0052] One end of the capacitor CH is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, and the other end of the capacitor CH is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0053] The capacitor CL is connected in parallel with the resistor RL, one end of the capacitor CL is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the capacitor CL is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0054] The collector of IGBT1 is connected to the positive electrode H_DC_BUS+ of the high-voltage DC side, the emitter of IGBT1 is connected to the collector of IGBT2, and the emitter of IGBT2 is connected to the negative electrode H_DC_BUS- of the high-voltage DC side;

[0055] The collector of IGBT3 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of IGBT3 is connected to the collector of IGBT4, and the emitter of IGBT4 is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0056] The collector of IGBT5 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of IGBT5 is connected to the collector of IGBT6, and the emitter of IGBT6 is connected to the negative electrode H_DC_BUS- of the high voltage DC side;

[0057] One end of the inductor L1 is connected to the emitter of IGBT1, and the other end of the inductor L1 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit;

[0058] One end of the inductor L2 is connected to the emitter of the IGBT3, and the other end of the inductor L2 is connected to the positive electrode L_DC_BUS+ of the low voltage DC side through a pre-charging circuit;

[0059] One end of the inductor L3 is connected to the emitter of the IGBT5, and the other end of the inductor L3 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit.

[0060] Refer to Figure 2 As shown, the pre-charging circuit includes KM1, KM2 and a resistor RC; wherein,

[0061] One end of the resistor RC is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the resistor RC is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through KM2; one end of KM1 is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of KM1 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side.

[0062] The first current detection module is connected to the high-voltage DC side of the DC-DC module unit and is used to detect the current on the high-voltage DC side; the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit and is used to detect the voltage on the high-voltage DC side.

[0063] The second current detection module is connected to the low-voltage DC side of the DC-DC module unit and is used to detect the current on the low-voltage DC side; the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit and is used to detect the voltage on the low-voltage DC side.

[0064] In an embodiment of the present utility model, the optical fiber communication extension module includes a dual-channel output driver, a high-performance optical fiber receiver and a high-performance optical fiber transmitter.

[0065] Reference Figure 3 As shown, the signal input port TX is connected to the first pin of the dual-channel output driver, the second pin of the dual-channel output driver is connected to the power supply +5V, one end of the resistor R1 is connected to the power supply +5V, the other end of the resistor R1 is connected to the third pin of the dual-channel output driver and the second pin of the high-performance optical fiber transmitter, one end of the resistor R2 is connected to the power supply +5V, the other end of the resistor R2 is connected to the first pin of the high-performance optical fiber transmitter, and the signal output port RX is connected to the fifth pin of the dual-channel output driver; capacitor C2 is connected in parallel with capacitor C3, one end of capacitor C3 is connected to the third pin of the high-performance optical fiber receiver and the power supply +5V, and the other end of capacitor C3 is connected to the second pin of the high-performance optical fiber receiver and the power ground GND; one end of capacitor C1 is connected to the eighth pin of the dual-channel output driver and the power supply +5V, and the other end of capacitor C1 is connected to the fourth pin of the dual-channel output driver and the power ground GND.

[0066] In one embodiment of the present invention, a plurality of groups of DC-DC module units are arranged in parallel.

[0067] In yet another embodiment of the present invention, a modular bidirectional DC-DC conversion instrument is provided, comprising the modular bidirectional DC-DC conversion device described in the present invention.

[0068] It should be understood that the utility model disclosed is not limited to the specific methods, schemes and materials described, because these can be changed. It should also be understood that the terms used here are only for the purpose of describing specific implementation schemes, rather than being intended to limit the scope of the utility model, and the scope of the utility model is only limited to the attached claims.

[0069] Those skilled in the art will also recognize, or be able to ascertain using no more than routine experimentation, many equivalents to the specific embodiments of the invention described herein. Such equivalents are also intended to be encompassed by the appended claims.

Claims

1. A modular bidirectional DC-DC converter, It is characterized in that The modular bidirectional DC-DC conversion device includes a human-machine interaction interface, a main control module, an optical fiber communication extension module and a plurality of DC-DC module units; wherein, The human-machine interaction interface communicates with the main control module via a signal bus to achieve parameter setting and status monitoring of the modular bidirectional DC-DC converter; The main control module communicates with the multiple groups of DC-DC module units through the optical fiber communication expansion module to achieve parameter setting and status monitoring of the multiple groups of DC-DC module units.

2. The modular bidirectional DC-DC converter according to claim 1, It is characterized in that The plurality of groups of DC-DC module units include a BUCK / BOOST conversion main circuit, a first current detection module, a first voltage detection module, a second current detection module, a second voltage detection module, a pre-charging circuit and a DC-DC control module; wherein, One end of the BUCK / BOOST conversion main circuit is connected to the high-voltage DC side of the DC-DC module unit, and the other end of the BUCK / BOOST conversion main circuit is connected to the pre-charging circuit; The first current detection module is connected to the high-voltage DC side of the DC-DC module unit, and the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit; the second current detection module is connected to the low-voltage DC side of the DC-DC module unit, and the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit; One end of the pre-charging circuit is connected to the BUCK / BOOST conversion main circuit, and the other end of the pre-charging circuit is connected to the low-voltage DC side of the DC-DC module unit; The DC-DC control module is connected to the first current detection module, the first voltage detection module, the second current detection module, and the second voltage detection module respectively.

3. The modular bidirectional DC-DC converter according to claim 2, It is characterized in that The BUCK / BOOST conversion main circuit includes capacitor CH, capacitor CL, inductor L1, inductor L2, inductor L3, IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6 and resistor RL; wherein, One end of the capacitor CH is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, and the other end of the capacitor CH is connected to the negative electrode H_DC_BUS- of the high voltage DC side; The capacitor CL is connected in parallel with the resistor RL, one end of the capacitor CL is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the capacitor CL is connected to the negative electrode H_DC_BUS- of the high voltage DC side; The collector of the IGBT1 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT1 is connected to the collector of the IGBT2, and the emitter of the IGBT2 is connected to the negative electrode H_DC_BUS- of the high voltage DC side; The collector of the IGBT3 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT3 is connected to the collector of the IGBT4, and the emitter of the IGBT4 is connected to the negative electrode H_DC_BUS- of the high voltage DC side; The collector of the IGBT5 is connected to the positive electrode H_DC_BUS+ of the high voltage DC side, the emitter of the IGBT5 is connected to the collector of the IGBT6, and the emitter of the IGBT6 is connected to the negative electrode H_DC_BUS- of the high voltage DC side; One end of the inductor L1 is connected to the emitter of the IGBT1, and the other end of the inductor L1 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit; One end of the inductor L2 is connected to the emitter of the IGBT3, and the other end of the inductor L2 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit; One end of the inductor L3 is connected to the emitter of the IGBT5, and the other end of the inductor L3 is connected to the positive electrode L_DC_BUS+ of the low-voltage DC side through a pre-charging circuit.

4. The modular bidirectional DC-DC converter according to claim 2, It is characterized in that The pre-charging circuit includes KM1, KM2 and a resistor RC; wherein, One end of the resistor RC is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the resistor RC is connected to the positive electrode L_DC_BUS+ on the low-voltage DC side through KM2; one end of the KM1 is connected to the common end of the inductor L1, the inductor L2 and the inductor L3, and the other end of the KM1 is connected to the positive electrode L_DC_BUS+ on the low-voltage DC side.

5. The modular bidirectional DC-DC converter according to claim 2, It is characterized in that The first current detection module is connected to the high-voltage DC side of the DC-DC module unit and is used to detect the current on the high-voltage DC side; the first voltage detection module is connected to the high-voltage DC side of the DC-DC module unit and is used to detect the voltage on the high-voltage DC side.

6. The modular bidirectional DC-DC converter according to claim 2, It is characterized in that The second current detection module is connected to the low-voltage DC side of the DC-DC module unit and is used to detect the current on the low-voltage DC side; the second voltage detection module is connected to the low-voltage DC side of the DC-DC module unit and is used to detect the voltage on the low-voltage DC side.

7. The modular bidirectional DC-DC converter according to claim 1, It is characterized in that The optical fiber communication extension module includes a dual-channel output driver, a high-performance optical fiber receiver and a high-performance optical fiber transmitter.

8. The modular bidirectional DC-DC converter according to claim 7, It is characterized in that The signal input port TX is connected to the first pin of the dual-channel output driver, the second pin of the dual-channel output driver is connected to the power supply +5V, one end of the resistor R1 is connected to the power supply +5V, the other end of the resistor R1 is connected to the third pin of the dual-channel output driver and the second pin of the high-performance optical fiber transmitter, one end of the resistor R2 is connected to the power supply +5V, the other end of the resistor R2 is connected to the first pin of the high-performance optical fiber transmitter, and the signal output port RX is connected to the fifth pin of the dual-channel output driver; capacitor C2 is connected in parallel with capacitor C3, one end of capacitor C3 is connected to the third pin of the high-performance optical fiber receiver and the power supply +5V, and the other end of capacitor C3 is connected to the second pin of the high-performance optical fiber receiver and the power ground GND; one end of capacitor C1 is connected to the eighth pin of the dual-channel output driver and the power supply +5V, and the other end of capacitor C1 is connected to the fourth pin of the dual-channel output driver and the power ground GND.

9. The modular bidirectional DC-DC converter according to claim 1, It is characterized in that A plurality of groups of the DC-DC module units are arranged in parallel.

10. A modular bidirectional DC-DC conversion instrument, It is characterized in that A modular bidirectional DC-DC converter comprising any one of claims 1 to 9.

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