KR20200053033A - Dc-dc converter for vehicle applying and control method of the same - Google Patents

Abstract

The present invention relates to a DC converter for a vehicle. The DC converter for a vehicle is connected to a high voltage battery, an inverter, a solar cell module, and a low voltage battery. In addition, the DC converter comprises: a converting unit boosting or pressuring input voltage to output; and a plurality of switching units selectively making the high voltage battery in contact with the solar cell module, the low voltage module, and the inverter by being switched according to control.

Description

Vehicle DC converter and its control method {DC-DC CONVERTER FOR VEHICLE APPLYING AND CONTROL METHOD OF THE SAME}

The present invention relates to a DC converter for a vehicle, and more particularly, to a DC converter for a vehicle and a control method thereof implemented to perform different functions by changing an electric path according to a mode.

Solar cells are photoelectric conversion elements that convert sunlight into electrical energy. Unlike other energy sources, solar cells are infinite and environmentally friendly, so their importance is increasing over time and the fields of application are also expanding. The automobile industry is also riding on this trend and developing and launching a vehicle equipped with a solar cell and a system for utilizing electric energy output therefrom.

Republic of Korea Patent Publication No. 10-2012-0086923 discloses a system for utilizing solar energy for automobiles. According to the above-mentioned solar energy utilization system for automobiles, when solar engines are being driven, solar energy accumulates in the battery installed in the vehicle, and when the engine is stationary and the outside temperature is low, auto parts that require preheating are powered by solar energy. It can be preheated, and if the engine is stationary and the outside temperature is appropriate, ventilation of the vehicle compartment can be achieved by solar energy, and if the engine is stopped and the outside temperature is high, solar energy may accumulate in the battery.

The solar energy utilization system for automobiles is limited to utilizing solar energy for battery charging, preheating of automobile parts, and ventilation of a vehicle cabin, and research on utilization through connection with a driving system of a hybrid vehicle is insufficient.

Therefore, the present invention has been proposed to solve the problems of the prior art as described above, and the object of the present invention is to implement a DC converter for a vehicle implemented to perform different functions by changing an electric path according to a mode and the same. In providing a control method.

The technical problem of the present invention is not limited to the above-mentioned matters, and those skilled in the art to which the present invention pertains from the following descriptions can also clearly understand other problems intended by the present invention. will be.

In order to achieve the above object, the DC converter for a vehicle according to an embodiment of the present invention is connected to a high voltage battery, an inverter, a solar cell module, and a low voltage battery, and the DC converter increases or decreases the input voltage. A conversion unit for outputting; And a plurality of switching units selectively connected to the high voltage battery, the solar cell module, the low voltage module, and the inverter by being switched according to control.

The plurality of switching units may include a first switching unit connected between the high voltage battery and the inverter; A second switching unit connected between the conversion unit and the inverter; A third switching unit connected between the solar cell module and the conversion unit; And a fourth switching unit connected between the low voltage battery and the converter.

One side of the first switching unit is connected to the high voltage battery, and the other side of the first switching unit is connected to the inverter.

One side of the second switching unit is connected to the conversion unit, and the other side of the second switching unit is connected between the first switching unit and the inverter.

One side of the third switching unit is connected to the solar cell module, and the other side of the third switching unit is connected to the conversion unit.

One side of the fourth switching unit is connected to the low-voltage battery, and the other side of the fourth switching unit is connected to the third switching unit and the conversion unit.

Under the first mode, the first swing part is switched on, and the second to fourth switch parts are switched off.

Under the first mode, the inverter drives the motor based on the voltage output from the high voltage battery, or the inverter charges the high voltage battery based on the voltage generated according to the driving of the motor.

Under the second mode, the first to third switching units are switched on, and the fourth switching unit is switched off.

Under the second mode, the converter outputs the voltage output from the solar cell module to charge the high voltage battery.

Under the third mode, the first, second and fourth switching units are switched on, and the third switching unit is switched off.

Under the third mode, the converter outputs the voltage output from the low voltage battery to charge the high voltage battery.

Under the fourth mode, the first and third switching units are switched off, and the second and fourth switching units are switched on.

Under the fourth mode, the converter boosts the voltage output from the low-voltage battery, and the inverter drives the motor based on the boosted voltage, or the converter generates a voltage generated by driving the motor to step down the voltage. Charge the low voltage battery.

A control method of a DC converter for a vehicle according to an embodiment of the present invention is a control method of a DC converter connected to a high voltage battery, an inverter, a solar cell module, and a low voltage battery, and according to a mode, it is connected between the high voltage battery and the inverter A first switching unit, a second switching unit connected between the conversion unit and the inverter, a third switching connection between the solar cell module and the conversion unit, and a first connection between the low-voltage battery and the conversion unit 4 Control the switching unit to control the DC converter to perform operation for each mode.

Under the first mode, the first swing unit is switched on, and the second to fourth switching units are switched off, so that the inverter drives the motor or drives the motor based on the voltage output from the high voltage battery. The inverter charges the high voltage battery based on the generated voltage.

Under the second mode, the first to third switching units are switched on, and the fourth switching unit is switched off to charge the high voltage battery by boosting the voltage output from the solar cell module.

Under the third mode, the first, second, and fourth switching units are switched on, and the third switching unit is switched off, so that the converter outputs the voltage output from the low voltage battery to charge the high voltage battery.

Under the fourth mode, the first and third switching units are switched off, and the second and fourth switching units are switched on, so that the voltage output from the low-voltage battery is boosted by the converter, and based on the boosted voltage. The inverter drives the motor or the voltage generated by the driving of the motor is stepped down to charge the low-voltage battery.

When the DC converter for a vehicle according to the preferred embodiment of the present invention is used, the vehicle's 48V driving battery can be charged using the power generated by the solar cell, thereby increasing the efficiency of the 48V driving system.

In addition, when the 48V driving battery is discharged, the vehicle driving stability can be improved because the 48V driving battery can be charged through control of the DC converter.

In addition, when the 48V driving battery fails, it is possible to improve the driving stability of the vehicle because the motor can be driven using the power of the 12V battery through control of the DC converter.

In addition, by performing a multifunction related to battery charging and emergency (emergency) driving using a single DC conversion field, it is possible to simplify the vehicle assembly process by reducing the controller components in the vehicle, reduce the vehicle weight, and reduce the vehicle cost.

In addition, since the battery can be charged by using the generated power of the solar cell, it is possible to provide a battery charging function in all cases when the vehicle is running or not.

1 is a view showing an example of a DC converter according to a preferred embodiment of the present invention applied to a vehicle driving system,
FIG. 2 is a view showing a specific configuration of the DC converter of FIG. 1.
3 and 4 are views for explaining the operation of the DC converter according to the first mode of the vehicle driving system according to a preferred embodiment of the present invention.
5 is a view for explaining the operation of the DC converter according to the second mode of the vehicle driving system according to a preferred embodiment of the present invention.
6 is a view for explaining the operation of the DC converter according to the third mode of the vehicle driving system according to a preferred embodiment of the present invention.
7 and 8 are diagrams for explaining the operation of the DC converter according to the fourth mode of the vehicle driving system according to a preferred embodiment of the present invention.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are exemplified only for the purpose of illustrating the embodiments of the present invention, and the embodiments of the present invention can be implemented in various forms, and It should not be interpreted as being limited to the described embodiments.

The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to a specific disclosure form, and it should be understood that it includes all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is said to be “directly connected” or “directly connected” to another component, it should be understood that no other component exists in the middle. Other expressions describing the relationship between the components, such as “between” and “just between” or “adjacent to” and “directly neighboring to” should be interpreted as well.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “include” or “have” are intended to indicate that a disclosed feature, number, step, action, component, part, or combination thereof exists, one or more other features or numbers, It should be understood that the existence or addition possibilities of steps, actions, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

On the other hand, when an embodiment can be implemented differently, functions or operations specified in a specific block may occur differently from the order specified in the flowchart. For example, two consecutive blocks may actually be executed substantially simultaneously, or the blocks may be performed backwards depending on related functions or operations.

Hereinafter, a DC converter for a vehicle and a control method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an example in which a DC converter according to a preferred embodiment of the present invention is applied to a vehicle driving system, and FIG. 2 is a diagram showing a specific configuration of the DC converter of FIG. 1.

1, the DC converter 10 according to a preferred embodiment of the present invention may be applied to a hybrid vehicle (ex, a hybrid vehicle of a mild type), but the field of application of the DC converter 10 is accordingly It is not limited.

As shown in FIG. 1, the DC converter 10 outputs a high voltage battery (ex, 48V battery) 20, a solar cell module 30, and a predetermined second voltage outputting a predetermined first voltage. And a low voltage battery (ex, 12V battery) 40 and an inverter (ex, 48V inverter) 60 that controls the electrical load (ex, 48V motor) 50.

Hereinafter, it is referred to as a 'vehicle driving system 1' including a DC converter 10, a high voltage battery 20, a solar cell module 30, a low voltage battery 40, an electric load 50 and an inverter 60. do.

Although only the components necessary for the convenience of the understanding and the description of the present invention are illustrated in FIG. 1, various components not illustrated in FIG. 1 may be added.

In one example, the vehicle driving system 1 of FIG. 1 may further include a control module (not shown) that performs control on the configuration in the vehicle driving system 1, and the control described below is made by the control module It is assumed.

The high voltage battery 20, the solar cell module 30, the low voltage battery 40, the electric load 50, and the inverter 60 in FIG. 1 are widely used in the art to which the present invention pertains, and detailed configuration And the operation is omitted, and briefly described as necessary.

As shown in Figure 2, the DC converter 10 is composed of a conversion unit 11 and a plurality of switching units (12 to 15), but further includes a configuration other than the design purpose, required specifications, etc. can do.

The converter 11 operates according to the design, and outputs the input voltage by boosting or stepping it down.

For example, a boost-buck DC-DC converter may be used as the converter 110, but is not limited thereto, and the internal configuration of the converter 110 may also be variously implemented.

The plurality of switching units 12 to 15 are switched under control, thereby realizing electrical connection between the high voltage battery 20, the solar cell module 30, the low voltage module 40, and the inverter 60.

The first stitching unit 12 is located between the high voltage battery 20 and the inverter 60, and is switched under control to perform electrical connection between the high voltage battery 20 and the inverter 60.

That is, one side of the first switching unit 12 is connected to the high voltage battery 20, and the other side of the first switching unit 12 is connected to the inverter 60.

The second switching unit 13 is located between the conversion unit 11 and the inverter 60, and is switched under control to perform electrical connection between the conversion unit 11 and the inverter 60.

That is, one side of the second switching unit 13 is connected to the conversion unit 11, and the other side of the second switching unit 13 is connected between the first switching unit 12 and the inverter 60.

The third switching unit 14 is located between the solar cell module 30 and the conversion unit 11 and is switched under control to perform electrical connection between the solar cell module 30 and the conversion unit 11.

That is, one side of the third switching unit 14 is connected to the solar cell module 30, and the other side of the third switching unit 14 is connected to the conversion unit 11.

The fourth switching unit 15 is located between the low voltage battery 40 and the conversion unit 11 and is switched under control to perform electrical connection between the low voltage battery 40 and the conversion unit 11.

That is, one side of the fourth switching unit 15 is connected to the low voltage battery 40, and the other side of the fourth switching unit 15 is connected between the third switching unit 14 and the conversion unit 11.

As described above, the vehicle driving system 1 includes a plurality of switching units 12 to 15, and an electrical connection relationship between components is determined according to the state of the plurality of switching units 12 to 15.

The present invention is characterized in that the operation of the vehicle driving system 1 according to the mode is controlled by controlling a plurality of switching units 12 to 15 in the vehicle driving system 1.

For example, if the first and fourth switching units 12 and 15 are switched off, and the second and third switching units 13 and 14 are switched on, the solar cell module 30 is the inverter 60 ).

As another example, when the first switching unit 12 is in the switched-on state and the second to fourth switching units 13 to 15 are in the switched-off state, the high voltage battery 20 is electrically connected to the inverter 60.

Hereinafter, the operation of the DC converter 10 under control of the first to fourth switching units 12 to 15 will be described in more detail.

3 and 4 are views for explaining the operation of the DC converter according to the first mode of the vehicle driving system according to a preferred embodiment of the present invention.

The vehicle driving system 1 illustrated in FIGS. 3 and 4 is operated in a first mode (or 'basic mode'), in which the first switching unit 12 is in a switched-on state, and the second to fourth switching units (13 ~ 15) is the switch-off state.

When the vehicle driving system 1 operates in the first mode, control according to MTPT (Maximum Torque Point Tracking) is performed.

When the vehicle driving system 1 operates in the first mode, the converter 11 of the DC converter 10 does not operate, and the inverter 60 is based on the voltage output from the high voltage battery 20. Drive 50 (Fig. 3, vehicle driving assist function), or based on the voltage generated by the driving of the motor 50, the inverter 60 charges the high voltage battery 20 (Fig. 4, battery charging function).

5 is a view for explaining the operation of the DC converter according to the second mode of the vehicle driving system according to a preferred embodiment of the present invention.

The vehicle driving system 1 illustrated in FIG. 5 is operated in a second mode (or 'solar-battery charging mode'), and the first to third switching units 12 to 14 are switched on, The fourth switching unit 15 is in a switched off state.

When the vehicle driving system 1 operates in the second mode, the DC converter 10 boosts and controls according to MPPT (Maximum Power Point Tracking).

When the vehicle driving system 1 operates in the second mode, the converter 11 boosts the voltage output from the solar cell module 30 to charge the high voltage battery 20.

6 is a view for explaining the operation of the DC converter according to the third mode of the vehicle driving system according to a preferred embodiment of the present invention.

The vehicle driving system 1 shown in FIG. 6 is operated in a third mode (or 'battery-battery charging mode'), for example, when the high voltage battery 20 is discharged, the low voltage battery 40 is This may be the case when charging the high voltage battery 20 by using it.

When the vehicle driving system 1 operates in the third mode, the first, second, and fourth switching units 12, 13, and 15 are switched on, and the third switching unit 14 is switched off.

When the vehicle driving system 1 operates in the third mode, the DC converter 10 boosts and controls according to MPPT.

When the vehicle driving system 1 operates in the third mode, the converter 11 boosts the voltage output from the low voltage battery 40 to charge the high voltage battery 20.

7 and 8 are diagrams for explaining the operation of the DC converter according to the fourth mode of the vehicle driving system according to a preferred embodiment of the present invention.

The vehicle driving system 1 shown in FIGS. 7 and 8 is a case of operating in a fourth mode (or 'emergency driving mode'), for example, when the high voltage battery 20 is broken, the low voltage battery 40 is used. This may be the case when the motor 50 is driven using the same.

When the vehicle driving system 1 operates in the fourth mode, the first and third switching units 12 and 14 are switched off, and the second and fourth switching units 13 and 15 are switched on. .

When the vehicle driving system 1 operates in the fourth mode, the DC converter 10 boosts / bucks and controls according to MTPT.

When the vehicle driving system 1 operates in the fourth mode, the converter 11 boosts the voltage output from the low-voltage battery 40 (operates in the boost mode), and based on the boosted voltage, the inverter 60 A driving the motor 50 (Fig. 7, vehicle driving assistance function), or the voltage generated by the driving of the motor 50 by the converter 11 (operated in buck mode) low-voltage battery 40 Charge (Fig. 8, battery charging function).

Even if all components constituting the embodiments of the present invention described above are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the object scope of the present invention, all of the components may be selectively combined and operated. In addition, although all of the components may be implemented by one independent hardware, a part or all of the components are selectively combined to perform a combined function or all functions in one or a plurality of hardware. It may be implemented as a computer program having a. In addition, such a computer program is stored in a computer readable recording medium (Computer Readable Media), such as a USB memory, CD disk, flash memory, etc., and read and executed by a computer, thereby implementing an embodiment of the present invention. The recording medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

As described above, although the DC converter for a vehicle and a control method thereof according to the present invention have been described according to embodiments, the scope of the present invention is not limited to a specific embodiment, and a person having ordinary knowledge in connection with the present invention Various alternatives, modifications, and changes can be carried out within the scope obvious to the user.

Therefore, the embodiments described in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the claims, and all technical spirits within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

1: Vehicle driving system
10: DC converter
11: conversion unit
12, 13, 14, 15: first to fourth switching unit
20: high voltage battery
30: solar cell module
40: low voltage battery
50: electrical load
60: inverter

Claims (12)

In the DC converter connected to the high-voltage battery, inverter, solar cell module and low-voltage battery,
The DC converter,
A converter for boosting or stepping down the input voltage to output the voltage; And
Switched according to control, consisting of a plurality of switching units for selectively connecting the high voltage battery, the solar cell module, the low voltage module and the inverter
DC converter for vehicles. According to claim 1,
The plurality of switching units,
A first switching unit connected between the high voltage battery and the inverter;
A second switching unit connected between the conversion unit and the inverter;
A third switching unit connected between the solar cell module and the conversion unit; And
And a fourth switching unit connected between the low voltage battery and the converter
DC converter for vehicles. According to claim 2,
One side of the first switching unit is connected to the high voltage battery, the other side of the first switching unit is connected to the inverter,
One side of the second switching unit is connected to the conversion unit, the other side of the second switching unit is connected between the first switching unit and the inverter,
One side of the third switching unit is connected to the solar cell module, the other side of the third switching unit is connected to the conversion unit,
One side of the fourth switching unit is connected to the low voltage battery, and the other side of the fourth switching unit is connected to the third switching unit and the conversion unit.
DC converter for vehicles. According to claim 2,
Under the first mode, the first swing part is switched on, and the second to fourth switch parts are switched off,
The inverter drives the motor based on the voltage output from the high voltage battery, or causes the inverter to charge the high voltage battery based on the voltage generated according to the driving of the motor.
DC converter for vehicles. According to claim 2,
Under the second mode, the first to third switching units are switched on, and the fourth switching unit is switched off,
The converter outputs the voltage output from the solar cell module to charge the high-voltage battery.
DC converter for vehicles. According to claim 2,
Under the third mode, the first, second and fourth switching units are switched on, and the third switching unit is switched off,
The converter outputs the voltage output from the low voltage battery to charge the high voltage battery.
DC converter for vehicles. According to claim 2,
Under the fourth mode, the first and third switching units are switched off, and the second and fourth switching units are switched on,
The converter boosts the voltage output from the low-voltage battery, and the inverter drives the motor based on the boosted voltage, or the converter generates a voltage generated by driving the motor to charge the low-voltage battery. Letting
DC converter for vehicles. In the control method of the DC converter connected to the high-voltage battery, inverter, solar cell module and low-voltage battery,
Depending on the mode, the first switching unit connected between the high voltage battery and the inverter, the second switching unit connected between the converter and the inverter, the third switching connected between the solar cell module and the converter, And controlling a fourth switching unit connected between the low-voltage battery and the converter, so that the DC converter performs mode-specific operations.
Method of controlling a DC converter for a vehicle. The method of claim 8,
Under the first mode, the first swing unit is switched on, and the second to fourth switching units are switched off, so that the inverter drives the motor or drives the motor based on the voltage output from the high voltage battery. The inverter to charge the high voltage battery based on the generated voltage.
Method of controlling a DC converter for a vehicle. The method of claim 8,
Under the second mode, the first to third switching units are switched on, and the fourth switching unit is switched off to boost the voltage output from the solar cell module so that the converter boosts the high voltage battery.
Method of controlling a DC converter for a vehicle. The method of claim 8,
Under the third mode, the first, second, and fourth switching units are switched on, and the third switching unit is switched off, so that the converter boosts the voltage output from the low voltage battery to charge the high voltage battery.
Method of controlling a DC converter for a vehicle. The method of claim 8,
Under the fourth mode, the first and third switching units are switched off, and the second and fourth switching units are switched on, so that the converter outputs the voltage output from the low voltage battery and boosts the voltage based on the boosted voltage. The inverter drives the motor, or the voltage generated by the driving of the motor is stepped down to charge the low-voltage battery.
Method of controlling a DC converter for a vehicle.

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