Multifunctional power conversion device suitable for mobile places

Abstract

The utility model discloses a multifunctional power supply conversion device suitable for a mobile place. The conversion device comprises an input filtering unit, an AC / DC bidirectional conversion unit, a low-voltage DC / DC bidirectional conversion unit, a resistive load and a control unit. Wherein the control unit further comprises a centralized operation processing unit, a communication interface, a signal sampling unit, an auxiliary power supply and a driving unit. The power supply conversion device provided by the utility model replaces a primary battery backup power supply system, at least three devices such as a charger, an inverter and detection equipment do not need to be independently equipped for a battery device, the space is saved, the cost performance is optimized, and the power supply conversion device is particularly important for a system with a limited space.

Description

Technical Field

[0001] The utility model relates to a switching power supply, in particular to a multifunctional power conversion device suitable for mobile places. Background Art

[0002] like Figure 1 As shown, in some special fields, such as ships, cars, airplanes and other mobile vehicles or places with relatively small spaces, because the power supply equipment or control system needs to be powered, it is usually necessary to equip a battery backup power supply system to ensure that when the generator or self-generation cannot be used, the battery system can also provide uninterrupted power supply. The battery backup power supply system includes a charger (or rectifier) ​​and an inverter. At the same time, for safety and reliability, the system may also need to be equipped with a battery tester to regularly detect and maintain the health of the battery system, or to quickly repair and eliminate problems when problems occur in the battery system. However, the system composed of three independent devices occupies a large space, is more complicated to operate, and is less economical and practical. Summary of the invention

[0003] Purpose of the invention: In view of the above problems, the utility model proposes a multifunctional power conversion device suitable for mobile places to solve the problems that the existing battery backup power supply system is complex, large in size and has low cost performance.

[0004] Technical solution: The technical solution adopted by the utility model is a multifunctional power conversion device suitable for mobile places, including an input filter unit, an AC / DC bidirectional conversion unit, a low-voltage DC / DC bidirectional conversion unit, a resistive load and a control unit; the AC source and its equivalent load are electrically connected to the AC / DC bidirectional conversion unit through the input filter unit, the other end of the AC / DC bidirectional conversion unit is electrically connected to the first port of the low-voltage DC / DC bidirectional conversion unit, the third port of the low-voltage DC / DC bidirectional conversion unit is electrically connected to the DC source and its equivalent load, and the second port of the low-voltage bidirectional DC / DC conversion unit is electrically connected to the resistive load; the control unit is electrically connected to the input filter unit, the AC / DC bidirectional conversion unit, the low-voltage DC / DC bidirectional conversion unit, and the resistive load respectively.

[0005] The control unit includes an operation processing unit, a communication interface, a signal sampling unit, an auxiliary power supply and a driving unit.

[0006] The device also includes an output filter unit, which is arranged between the third port of the low-voltage DC / DC bidirectional conversion unit and the direct current source and its equivalent load.

[0007] The control unit is also connected to an external circuit via a sampling port and a communication port.

[0008] The control unit is used for sampling the resistance load and switching the working mode of the multifunctional power conversion device.

[0009] The resistance value of the resistive load is adjustable.

[0010] Beneficial effects: Compared with the prior art, the utility model has the following advantages: simplified structure, reduced volume, using AC / DC bidirectional conversion unit and low-voltage DC / DC bidirectional conversion unit to achieve rectification, reversibility, and maintainability from the hardware point of view, reducing repeated functional units of multiple devices and improving the spatial density of the device. Secondly, the utility model has high cost performance, because the device is reduced, the function is complex, the operation is simplified, and the space occupation is reduced, thus achieving a higher cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a conventional battery backup power system block diagram;

[0012] Figure 2 It is a block diagram of a multifunctional power conversion device suitable for mobile places provided by an embodiment of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure of a control unit provided by an embodiment of the utility model;

[0014] Figure 4 It is a schematic diagram of the rectification mode provided by the embodiment of the utility model;

[0015] Figure 5 It is a schematic diagram of the inverter mode provided by the embodiment of the utility model;

[0016] Figure 6 It is a schematic diagram of the maintenance mode provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Example 1

[0019] like Figure 2 As shown in the block diagram, the embodiment of the utility model provides a multifunctional power conversion device suitable for mobile places, including an input filter unit, an AC / DC bidirectional conversion unit, a low-voltage DC / DC bidirectional conversion unit, a resistive load, and a control unit. The specific connections are as follows: one end of the input filter unit is connected to an AC source or an equivalent load, and the other end is connected to the AC / DC bidirectional conversion unit; the other end of the AC / DC bidirectional conversion unit is connected to port 1 of the low-voltage DC / DC bidirectional conversion unit, and port 3 of the low-voltage DC / DC bidirectional conversion unit is connected to a DC source or an equivalent load. In addition, port 2 of the low-voltage DC / DC bidirectional conversion unit is also connected to a resistive load.

[0020] like Figure 3 As shown, the control unit includes an operation processing unit, a communication interface, a signal sampling, an auxiliary power supply, and a drive unit. Each port is respectively connected to an input filter unit, an AC / DC bidirectional conversion unit, a low-voltage DC / DC bidirectional conversion unit, a resistive load, and an output filter unit. It is also connected to the outside through a sampling port and a communication port. The utility model does not improve the structure of the control unit itself.

[0021] The working principle of the multifunctional power conversion device suitable for mobile places in different working modes is further explained:

[0022] Rectification mode: Figure 4 As shown, an AC source or an equivalent load is used as an input source to supply power to an AC / DC bidirectional conversion unit through an input filter. The AC / DC bidirectional conversion unit operates in a rectification state and outputs high-voltage DC to port 1. At the same time, a low-voltage DC / DC bidirectional conversion unit operates in a step-down mode to supply power to a DC source or an equivalent load connected to output port 3.

[0023] Inverter mode: Figure 5 As shown, the DC source or equivalent load connected to port 3 is used as an input source to supply power to the low-voltage DC / DC bidirectional conversion unit, which works in boost mode, and port 1 outputs high-voltage DC. At the same time, the AC / DC bidirectional conversion unit works in the inverter state to output AC, and supplies power to the AC source or equivalent load through the input filter.

[0024] Maintenance mode: Figure 6 As shown, the AC / DC bidirectional conversion unit working in the inverter mode stops working or is originally in a non-working state, and the port 2 of the low-voltage DC / DC bidirectional conversion unit supplies power to the resistive load, and the voltage of the port 2 and the resistance value of the resistive load are adjustable.

[0025] It can be seen from the above working principle that in the rectification and inversion modes, the low-voltage DC / DC bidirectional conversion unit works in the buck-boost state, and is affected by the voltage of the low-voltage DC terminal, such as the battery voltage, which has a maximum voltage and a minimum voltage. Therefore, the voltage of port 1 of the low-voltage DC / DC bidirectional conversion unit can be greater than or equal to the voltage of port 2 and port 3. In the maintenance mode, the low-voltage DC / DC bidirectional conversion unit works in the boost state, so the voltage of port 2 is greater than or equal to the voltage of port 3. At the same time, the output voltage of port 2 of the low-voltage DC / DC bidirectional conversion unit can be adjusted according to the input voltage of port 3, and may be inconsistent with the voltage when working in the inversion mode or rectification mode.

[0026] If the EMC performance of the system is good, the multifunctional power conversion device of the aforementioned embodiment 1 may also not have an input filter unit, and the AC source or equivalent load may be directly connected to the AC / DC bidirectional conversion unit, and the function and efficacy of the device will not change.

[0027] To sum up, the multifunctional device realizes the integration of rectification and inversion functions from the hardware system principle, and realizes the maintenance function by combining the resistive load with the low-voltage DC / DC bidirectional conversion unit, thereby realizing one machine to replace the traditional multi-machine device (charger, inverter, detection equipment), realizing the simplification of structure and the integration of functions, and utilizing the multi-mode control of the system to simplify the operation and effectively improve the space utilization, saving a lot of space for mobile devices such as ships and cars in some specific occasions, and improving the cost performance.

Claims

1. A multifunctional power conversion device suitable for mobile places, characterized in that: It comprises an input filter unit, an AC / DC bidirectional conversion unit, a low-voltage DC / DC bidirectional conversion unit, a resistive load and a control unit; an AC source and its equivalent load are electrically connected to the AC / DC bidirectional conversion unit through the input filter unit, the other end of the AC / DC bidirectional conversion unit is electrically connected to a first port of the low-voltage DC / DC bidirectional conversion unit, the third port of the low-voltage DC / DC bidirectional conversion unit is electrically connected to a DC source and its equivalent load, and the second port of the low-voltage bidirectional DC / DC conversion unit is electrically connected to the resistive load; the control unit is electrically connected to the input filter unit, the AC / DC bidirectional conversion unit, the low-voltage DC / DC bidirectional conversion unit and the resistive load respectively.

2. The multifunctional power conversion device suitable for mobile places according to claim 1 is characterized in that: The control unit includes an operation processing unit, a communication interface, a signal sampling unit, an auxiliary power supply and a driving unit.

3. The multifunctional power conversion device suitable for mobile places according to claim 1, characterized in that: The device also includes an output filter unit, which is arranged between the third port of the low-voltage DC / DC bidirectional conversion unit and the direct current source and its equivalent load.

4. The multifunctional power conversion device suitable for mobile places according to claim 1, characterized in that: The control unit is also connected to an external circuit via a sampling port and a communication port.

5. The multifunctional power conversion device suitable for mobile places according to claim 1, characterized in that: The control unit is used for sampling the resistance load and switching the working mode of the multifunctional power conversion device.

6. The multifunctional power conversion device suitable for mobile places according to claim 1, characterized in that: The resistance value of the resistive load is adjustable.

Images