KR102123373B1 - Module type bidirectional dc-dc converter - Google Patents

Abstract

A modular bidirectional DC-DC converter is disclosed. A board having a plurality of slots that are wired according to the electrical connection relationship of the modular bidirectional DC-DC converter of the present invention; A switching module detachably formed in the slot and mounted on at least one of the slots according to a capacity to operate according to a control signal of a control unit; And a bus bar module installed on the board to input/output a low voltage power supply or a high voltage power supply to the switching module according to an operation mode, wherein the control unit includes a voltage monitoring unit monitoring a high voltage or a low voltage input to the switching module; A current monitoring unit that monitors the current flowing through the switching module; And an MCU for switching control of each of the switching modules according to the monitoring results of the voltage monitoring unit and the current monitoring unit, wherein the bus bar module receives a low voltage from a low voltage power supply and inputs it to the switching module or by the switching module. A first bus bar for applying the power-converted low voltage to a low voltage power source; A second bus bar that receives a high voltage from a high voltage power supply and applies a high voltage input from the switching module or power converted by the switching module to a high voltage power supply; And a third bus bar connecting the switching module to ground, and the board further includes a protection unit blocking an abnormal voltage input from a high power supply or a low voltage power input/output through the bus bar module, and the protection unit It is disposed between the switching module and the bus bar module, and when the switching module is mounted in the slot, the control unit switches to the switching module depending on whether an operation mode is a boost mode or a buck mode. It is characterized in that power conversion is performed between a high voltage power supply or a low voltage power supply by inputting a signal.

Description

Modular bidirectional DC-DC converter {MODULE TYPE BIDIRECTIONAL DC-DC CONVERTER}

The present invention relates to a modular bi-directional DC-DC converter, and more specifically, a modular bi-directional DC that can control the converter capacity by modularizing the switching part of the bi-directional DC-DC converter and allowing the switching module to be attached and detached to the board. -It is about DC converter.

As the 48V system for vehicles has recently been popularized, the need for a bi-directional DC-DC converter has emerged to control the electric flow of the existing 12V system and the 48V system. In the bidirectional DC-DC converter, the switch is controlled according to a command signal, and operates in a boost mode or a buck mode. The buck mode is a mode for transferring energy from a high voltage source to a low voltage source, and the boost mode is a mode for transferring energy from a low voltage source to a high voltage source.

Meanwhile, as a vehicle battery system has been developed with a high capacity, a bi-directional DC-DC converter has been developed in a multi-phases structure to accommodate a high capacity. In the bi-directional multi-phase DC-DC converter, the bi-directional DC-DC converters of each phase are sequentially driven through a predetermined sequence. When a bi-directional DC-DC converter is used as a multi-phase structure, the capacitor size decreases due to low ripple and exhibits fast response characteristics, and high efficiency can be achieved according to current sharing.

The background technology of the present invention is disclosed in Korean Patent Application Publication No. 10-2017-0081497 (2017.07.12)'Vehicle converter control method and system'.

In the conventional bidirectional DC-DC converter, when the specification is determined, the number of phases is determined according to the capacity, and according to the capacity, the bidirectional DC-DC converter must be newly designed, and accordingly, the process and verification must be newly performed.

The present invention was devised to improve the above-mentioned problems, and an object according to an aspect of the present invention is to modulate the converter capacity by modularizing the switching part of the bi-directional DC-DC converter so that it can be attached to and detached from the board. It is to provide a DC-DC converter.

A modular bidirectional DC-DC converter according to an aspect of the present invention includes a board having a plurality of slots which are wired according to the electrical connection relationship of the bidirectional DC-DC converter; A switching module detachably formed in the slot and mounted on at least one of the slots according to a capacity to operate according to a control signal of a control unit; And a bus bar module installed on the board to input/output a low-voltage power supply or a high-voltage power supply to the switching module according to an operation mode, wherein the control unit includes a voltage monitoring unit monitoring a high voltage or a low voltage input to the switching module; A current monitoring unit monitoring the current flowing through the switching module; And an MCU for switching control of each of the switching modules according to the monitoring results of the voltage monitoring unit and the current monitoring unit, wherein the bus bar module receives a low voltage from a low voltage power source and inputs it to the switching module or by the switching module. A first bus bar for applying the power-converted low voltage to a low voltage power source; A second bus bar that receives a high voltage from a high voltage power supply and applies a high voltage input from the switching module or power converted by the switching module to a high voltage power supply; And a third bus bar connecting the switching module to ground, and the board further includes a protection unit blocking an abnormal voltage input from a high power supply or a low voltage power input/output through the bus bar module, and the protection unit It is disposed between the switching module and the bus bar module, and when the switching module is mounted in the slot, the control unit switches to the switching module according to whether an operation mode is a boost mode or a buck mode. It is characterized in that power conversion between a high voltage power supply or a low voltage power supply is performed by inputting a signal.

Modular bi-directional DC-DC converter according to an aspect of the present invention can be detachable switching unit according to the capacity to easily design the DC-DC converter and thereby simplify the process and verification procedure for the bi-directional DC-DC converter. have.

1 is a block diagram of a modular bidirectional DC-DC converter according to an embodiment of the present invention.
2 is a view showing an example of attaching and detaching the switching module of the modular bi-directional DC-DC converter according to an embodiment of the present invention.

Hereinafter, a modular bidirectional DC-DC converter according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user or operator's intention or practice. Therefore, the definition of these terms should be made based on the contents throughout the specification.

1 is a block diagram of a modular bidirectional DC-DC converter according to an embodiment of the present invention, and FIG. 2 is an example of detaching a switching module of a modular bidirectional DC-DC converter according to an embodiment of the present invention. It is a drawing shown.

1, the modular bi-directional DC-DC converter according to an embodiment of the present invention includes a board 10, a control unit 20 and a power converter 30. The power conversion unit 30 includes a switching module 32, a bus bar module 40 and a protection unit 31.

The board 10 includes a plurality of slots 33 that are wired according to the electrical connection relationship of the bidirectional DC-DC converter.

The board 10 may be manufactured in the form of a one board or a two board. For example, when the board 10 is manufactured in the form of a one board, the control unit 20 and the power converter 30 are described above. All may be mounted on one board 10, and when manufactured in a two-board form, one of them may be equipped with a control unit 20, and the other may be equipped with a power conversion unit 30.

A plurality of slots 33 are provided as described above, and a switching module 32 may be selectively mounted to each of the slots 33. The slot 33 electrically connects the switching module 32 to the low-voltage power supply or the high-voltage power supply through the protection unit 31 and also to the control unit 20.

That is, when the specification of the bidirectional DC-DC converter to be tested or verified by the user is determined, the switching module 32 can be selectively selected and mounted on each slot 33 according to the specification of the bidirectional DC-DC converter. have.

As the switching module 32 is mounted in the slot 33, each switching module 32 is not only electrically connected to the high voltage power and low voltage power through the protection unit 31, but also electrically connected to the control unit 20. .

Accordingly, the switching module 32 is switched according to the switching signal of the control unit 20 to perform bidirectional power conversion between the high voltage power supply and the low voltage power supply.

Here, the number and location of the slots 33 is not particularly limited and may be variously provided according to a bidirectional DC-DC converter to be tested or verified.

The power converter 30 operates according to a switching signal of the controller 20, that is, a field effect transistor (FET) signal, and powers a voltage input from a high voltage power source (not shown) or a low voltage power source (not shown) to a high voltage or a low voltage. To convert.

First, each of the switching modules 32 is independently formed in a module form and detachable from the slot 33 of the board 10, and operates according to a switching signal of the control unit 20 to generate a high voltage power supply (not shown) or The voltage input from the low voltage power supply (not shown) is converted to high voltage or low voltage.

The high voltage power supply and the low voltage power supply may supply high voltage and low voltage to each electronic component in the vehicle, respectively, and may be electrically connected to the switching module 32 for power conversion between each other.

The high voltage power supply and the low voltage power supply may be composed of 48V power supply and 12V power supply, respectively, according to a conventional power conversion system, but are not limited thereto.

In addition, the high-voltage power supply and the low-voltage power supply may include a lithium battery, a lead acid battery, a super capacitor, or an ultra-capacitor alone or in combination, but are not limited to the above-described objects and include all configurations capable of supplying power to electronic components of a vehicle. Can be.

Accordingly, the switching module 32 has one end connected to the high voltage power supply and the other end electrically connected to the low voltage power supply to perform bidirectional power conversion between the high voltage power supply and the low voltage power supply.

Here, the switching module 32 includes one inductor that charges or discharges power, and two switches that are turned on or off according to the switching signal of the control unit 20.

The control unit 20 inputs a switching signal to each switch depending on whether it is an operation mode, for example, a boost mode or a buck mode, and the two switches each turn on or off according to the switching signal of the control unit 20, thereby inducting By repeating the process of charging or discharging the power, power conversion between the high voltage power and the low voltage power is performed. Here, the two switches may be configured as a FET, but is not limited thereto, and various types of switches may be employed.

The bus bar module 40 is installed on the board 10 and inputs and outputs low voltage power or high voltage power to the switching module 32 according to the operation mode.

The bus bar module 40 includes a first bus bar 42, a second bus bar 43 and a third bus bar 41.

The first bus bar 42 receives the low voltage from the low voltage power supply and inputs it to the switching module 32 or applies the low voltage converted by the switching module 32 to the low voltage power supply.

The second bus bar 43 receives a high voltage from a high voltage power supply, and inputs the high voltage from the switching module 32 or applies the high voltage converted by the switching module 32 to the high voltage power supply.

The third bus bar 41 connects the switching module 32 to ground.

The protection unit 31 blocks abnormal voltage input from a high power supply or a low voltage power input/output through the bus bar module 40.

The protection unit 31 is disposed between the switching module 32 and the busbar module 40 to block abnormal voltages input from a high power supply or a low voltage power supply that is input/output through the busbar module 40, thereby abnormality. Failure or abnormal operation of the switching module 32 due to voltage is prevented.

When the switching module 32 is mounted in the slot 33, the control unit 20 sends a switching signal to the switching module 32 according to whether it is in an operation mode, for example, a boost mode or a buck mode. The input voltage converts power from a high voltage power supply or a low voltage power supply into a high voltage or low voltage.

The control unit 20 includes a power supply unit 21, a voltage monitoring unit 23, a CAN (Car Area Network) communication unit 22, a voltage monitoring unit 23, a current monitoring unit 24, and a microcontroller unit (MCU) 25 ).

The power supply unit 21 applies power to the MCU 25.

The CAN communication unit 22 performs CAN communication between the host controller and the MCU 25. When the control command is input from the upper controller (not shown), the CAN communication unit 22 transmits the control command to the MCU 25. The MCU 25 controls the switching module 32 according to the control command.

The voltage monitoring unit 23 monitors high voltage or low voltage input to the switching module 32.

The current monitoring unit 24 monitors the current flowing through the switching module 32.

When the control command is input from the host controller through the CAN communication unit 22, the MCU 25 inputs a switching signal to the switching module 32 according to the control command. In this case, the MCU 25 is based on the voltage and current input from each of the voltage monitoring unit 23 and the current monitoring unit 24, depending on whether the operation mode, for example, boost mode or buck mode, each switching module By inputting a switching signal to the switches provided in (32), each switch is turned on or off to repeat the process of charging or discharging power to the inductor, thereby performing power conversion between the high voltage power supply and the low voltage power supply.

That is, the modular bidirectional DC-DC converter according to an embodiment of the present invention includes a board 10 having a plurality of slots 33 which are wired according to the electrical connection relationship of the bidirectional DC-DC converter, and the slot ( It is formed detachably on 33) so that the switching module 32 that can be mounted on at least one of the slots 33 according to the capacity can be detached.

Through this, the user can freely selectively detach and switch the switching module 32 according to the specifications of the bi-directional DC-DC converter to be tested or verified, thereby facilitating the design of the bi-directional DC-DC converter, and the bi-directional DC-DC converter. To simplify the process and verification process.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art to which the technology pertains are capable of various modifications and other equivalent embodiments. Will understand. Therefore, the true technical protection scope of the present invention should be defined by the claims below.

10: board
20: control unit
21: power supply
22: CAN communication unit
23: voltage monitoring unit
24: current monitoring unit
30: power conversion unit
31: protector
32: switching module
33: slot
40: busbar module
41: 3rd bus bar
42: first bus bar
43: Second bus bar

Claims (1)

Board having a plurality of slots to be wired according to the electrical connection relationship of the bi-directional DC-DC converter;
A switching module detachably formed in the slot and mounted on at least one of the slots according to a capacity to operate according to a control signal of a control unit; And
It is installed on the board and includes a bus bar module for inputting and outputting a low voltage power or a high voltage power to the switching module according to the operation mode,
The control unit includes a voltage monitoring unit that monitors a high voltage or a low voltage input to the switching module; A current monitoring unit monitoring the current flowing through the switching module; And an MCU for switching control of each of the switching modules according to the monitoring results of the voltage monitoring unit and the current monitoring unit,
The bus bar module may include a first bus bar that receives a low voltage from a low voltage power source and inputs it to the switching module or applies a low voltage converted by the switching module to a low voltage power source; A second bus bar that receives a high voltage from a high voltage power supply and applies a high voltage input from the switching module or power converted by the switching module to a high voltage power supply; And a third bus bar connecting the switching module to ground,
The board further includes a protection unit that blocks abnormal voltage input from a high power supply or a low voltage power input and output through the bus bar module,
The protection unit is disposed between the switching module and the bus bar module,
When the switching module is mounted in the slot, the control unit performs a power conversion between a high voltage power supply or a low voltage power supply by inputting a switching signal to the switching module according to whether an operation mode is a boost mode or a buck mode. And
The board may be in the form of a one board or a two board, and if the board is in the form of the one board, the controller and the switching module, the bus bar module and the board in the one board form If the protection unit is mounted, and the board is of the two-board type, the control unit is mounted on any one of the two-board type boards, and the switching module, the bus bar module, and the protection unit are mounted on the other one. Modular bidirectional DC-DC converter.

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