KR101866966B1 - Power supply apparatus for vehicle and driving method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply device for a vehicle and a driving method thereof, and more particularly, And a method of driving the same.
A power supply apparatus for a vehicle according to an embodiment of the present invention includes power supply means disposed in a vehicle for outputting a supply voltage, a signal generator for generating a dark current shutoff signal, And a second switch for outputting a supply voltage to the first load based on a comparison result between the supply voltage input from the first switch unit and the predetermined reference voltage at the time of shorting of the first load And a second switch portion for switching the first switch portion.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply apparatus for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply device for a vehicle and a driving method thereof, and more particularly, And a method of driving the same.

In recent years, there has been a tendency that a device capable of improving various fuel economy is added to an internal combustion engine vehicle in accordance with a demand for prevention of environmental pollution and reduction of fuel.

The application of an idle stop & go (ISG) device, which is one of the devices for improving the fuel efficiency of a vehicle, has recently been expanded. Such an ISG device inputs various conditions such as vehicle speed, accelerator pedal and brake pedal operation, engine speed, coolant temperature, air conditioner operation, or gradient section travel, Thereby improving fuel efficiency.

Generally, the ISG device is composed of a bypass circuit for supplying power to the load and a DC-DC converter for boosting the power supply. If the ISG function is not working, current flows through the bypass circuit to reduce the dark current.

On the other hand, when the ISG function operates, the voltage is stepped up by the DC-DC converter and output to each load. However, when a large number of loads are connected to a single DC-DC converter to output a boosted voltage, short-circuiting of the low-power load may occur, thereby causing damage or severe burning of the wire connected to the load .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle control system for controlling a power of a small power load separately from a large power load, And to provide a power supply device and method of the power supply.

It is another object of the present invention to provide a power supply apparatus and method for a vehicle that prevents occurrence of a dark current due to long-term storage of the vehicle.

Other features and advantages of the invention will be set forth in the description which follows, or may be obvious to those skilled in the art from the description and the claims.

According to an aspect of the present invention, there is provided a power supply apparatus for a vehicle, including: a power supply unit disposed in a vehicle for outputting a supply voltage; a signal generator for generating a dark current cutoff signal; A first switch section for outputting a supply voltage to the first load and the second load at the time of input, and a second switch section for outputting the supply voltage to the first load and the second load, based on a comparison result between the supply voltage input from the first switch section and the preset reference voltage, And a second switch portion for switching the supply voltage to be output to the first load.

Here, the first switch section includes a driver receiving the dark current cutoff signal and a bypass FET for outputting the supply voltage to the first load and the second load.

Further, the second switch section includes a switch for outputting the supply voltage to the first load, a comparator for comparing the supply voltage and the predetermined reference voltage, and a latch circuit for switching the supply voltage to be output to the first load.

Further, the second switch unit supplies the supply voltage to the first load when the supply voltage is equal to or lower than the reference voltage.

Further, the second switch portion blocks the supply voltage from being supplied to the first load when the supply voltage exceeds the reference voltage.

According to an aspect of the present invention, there is provided a method of supplying power to a vehicle, the method comprising: supplying a supply voltage to a first load and a second load, / RTI >

Here, in the step of switching the supply voltage, the supply voltage is outputted to the first load and the second load when the dark current cut-off signal is inputted.

Further, in the step of switching the supply voltage, the supply voltage is compared with a predetermined reference voltage, and the output of the supply voltage to the first load is blocked based on the comparison result.

Further, in the step of switching the supply voltage, when the supply voltage is equal to or lower than the reference voltage as a result of comparing the supply voltage with the reference voltage, the supply voltage is output to the first load.

Further, in the step of switching the supply voltage, when the supply voltage exceeds the reference voltage as a result of the comparison between the supply voltage and the reference voltage, the supply voltage is prevented from being output to the first load.

The power supply apparatus and method of a vehicle according to an embodiment of the present invention can prevent the fuse from being burned by cutting off the power supply when a load is short-circuited when the ISG system is driven.

In addition, by separately controlling the currents separately from the low-power loads, it is possible to prevent damage to the wires connected to the low-power loads.

In addition, an input signal for blocking the dark current can be generated to prevent occurrence of a dark current due to a long time of leaving.

In addition, when restarting, it is possible to prevent electrical equipment from being reset due to low voltage.

Also, during cranking, the electrical equipment that is reset due to the low voltage can be further connected.

In addition, other features and advantages of the present invention may be newly understood through embodiments of the present invention.

1 is a diagram showing a configuration of a power supply apparatus for a vehicle according to an embodiment of the present invention.
2 is a circuit diagram of a power supply device for a vehicle according to an embodiment of the present invention
3 is a circuit diagram showing the current flow of the power supply device
4 is a circuit diagram showing the flow of current when the supplied voltage is equal to or lower than the reference voltage as a result of comparison between the supplied voltage and the reference voltage.
5 is a circuit diagram showing the flow of current when the supplied voltage exceeds the reference voltage as a result of comparison between the supplied voltage and the reference voltage.
6 is a flowchart illustrating a method of driving a power supply according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a diagram showing a configuration of a power supply apparatus for a vehicle according to an embodiment of the present invention. 2 is a circuit diagram of a power supply device for a vehicle according to an embodiment of the present invention.

1 and 2, a power supply 100 for a vehicle according to an embodiment of the present invention includes a power supply unit 110, a signal generation unit 120, a first switch unit 130, (140).

The power supply means 110 supplies electric power to an electric device disposed in the vehicle, and supplies power to, for example, an audio device, a navigation device, a black box device, and a lighting device of the vehicle. The voltage output from the power supply means 110 is supplied to the electric device of the vehicle through the electric wire, and when excessive current flows, burning may occur in the electric wire. In the present invention, the voltage output from the power supply means 110 can be controlled through the fuse so that excessive current does not flow over a predetermined value. The power supply unit 110 supplies the output voltage to the first switch unit 130.

The signal generator 120 generates a dark current cutoff signal. Here, the dark current represents a minimum current for maintaining the performance of the vehicle when the vehicle is completely turned off. At this time, as the output of the dark current increases, the time until the vehicle is discharged becomes shorter. Therefore, the signal generator 120 outputs the dark current cutoff signal, thereby preventing the discharge due to the long-time leaving of the vehicle. The signal generating unit 120 outputs the dark current cutoff signal to the first switch unit 130 and the second switch unit 140.

The first switch unit 130 outputs the supply voltage output from the power supply unit 110 to the first load and the second load. Specifically, when the first switch unit 130 receives the dark current cutoff signal, the first switch unit 130 outputs the supplied power to the first load and the second load.

Here, the first load represents a load that can be short-circuited by the supply voltage because the capacity of the voltage that can be input to the small-power load is small. Also, the second load is a load in which the capacity of a voltage that can be input to the large-power load is large, so that the short-circuit does not occur due to the supply voltage. By separately controlling the currents of the small power load and the large power load, it is possible to prevent the damage of wires connected to the small power load and the occurrence of burning.

The first switch unit 130 includes a driver 132 receiving the dark current shutoff signal and a bypass FET 134 for outputting the power supplied from the power supply unit 110 to the first load and the second load . At this time, the driver 132 may be turned on or off depending on whether the dark current shutoff signal is input. The driver 132 is turned on when the dark current shutoff signal is input and outputs a dark current shutoff signal to the bypass FET 134. [ Accordingly, the bypass FET 134 receives the dark current shutoff signal and can output the supply voltage input from the power supply means 110 to the first load and the second load. On the other hand, the driver 132 is turned off when the dark current shutoff signal is not input, and the dark current shutoff signal can not be output to the bypass FET 134. [

The first switch unit 130 is turned on at all times and outputs the supply voltage input from the power supply unit 110 to the first load and the second load. However, when the vehicle is restarted in the ISG system of the vehicle, the first switch unit 130 may be temporarily turned off. Here, in the ISG system of the vehicle, when the vehicle is restarted, the battery voltage temporarily drops by the starting motor, and the electric components are reset. In order to prevent such a reset phenomenon of the electrical equipment, the boost converter can boost the supply voltage input from the power supply means 110 and output the boosted voltage to stabilize the power supply of the electrical equipment.

Then, the second switch unit 140 supplies the supply voltage input from the first switch unit 130 to the first load. Here, the second switch unit 140 may include a switch 142 for outputting the input supply voltage to the first load. The first switch unit 130 outputs the input supply voltage from the switch 142 to the first load. At this time, the first load may be short-circuited due to a voltage higher than the capacity of the first load. In this case, the overcurrent flows and the heat generated by the current not only melts the fuse but also damages the wire connected to the first load or burns the wire. According to the present invention, when the first load is short-circuited, the current can be controlled to prevent fuse burnout and wire damage and burning due to overcurrent.

Specifically, when a short-circuit of the first load occurs, the second switch unit 140 controls the current supplied to the first load through comparison between the input supply voltage and a preset reference voltage. Here, the second switch unit 140 may include a comparator that compares the supply voltage and the reference voltage. As a result of comparison between the supply voltage and the reference voltage, if the supply voltage is lower than the reference voltage, the second switch unit 140 outputs the supply voltage to the first load.

On the other hand, if the supply voltage exceeds the reference voltage as a result of the comparison between the supply voltage and the reference voltage, the second switch unit 140 blocks the supply voltage from being output to the first load. Here, the second switch unit 140 may include a latch circuit 146 for blocking the supply voltage from being output to or output from the first load based on the comparison result of the supply voltage and the reference voltage.

Here, the second switch unit 140 can be operated independently without being controlled through an MCU (Micro Controller Unit).

3 is a circuit diagram showing the current flow of the power supply device.

Referring to FIG. 3, the power supply unit 110 outputs a supply voltage to the first switch unit 130. Also, the signal generator 120 outputs a dark current cutoff signal to the first switch unit 130 and the second switch unit 140. The first switch unit 130 includes a driver 132 receiving the dark current cutoff signal output from the signal generating unit 120 and a bypass FET 134 receiving the supply voltage output from the power supply unit 110 can do. At this time, the driver 132 may be turned on or off according to the input of the dark current shutoff signal.

The first switch unit 130 outputs the supply voltage input from the power supply unit 110 to the second switch unit 140 and the second load when the dark current cutoff signal is input. Here, the second switch unit 140 may include a switch 142 receiving a supply voltage input from the first switch unit 130. The second switch unit 140 outputs the input supply power to the first load.

4 is a circuit diagram showing the flow of current when the supplied voltage is equal to or lower than the reference voltage as a result of comparison between the supplied voltage and the reference voltage.

Referring to FIG. 4, the power supply unit 110 outputs a supply voltage to the first switch unit 130. Also, the signal generator 120 outputs a dark current cutoff signal to the first switch unit 130 and the second switch unit 140. The first switch unit 130 includes a driver 132 receiving the dark current cutoff signal output from the signal generating unit 120 and a bypass FET 134 receiving a supply voltage output from the power supply unit 110 can do. At this time, the driver 132 may be turned on or off according to the input of the dark current shutoff signal.

The first switch unit 130 outputs the supply voltage input from the power supply unit 110 to the second switch unit 140 and the second load when the dark current cutoff signal is input. Here, the second switch unit 140 may include a switch 142 receiving a supply voltage input from the first switch unit 130. The second switch unit 140 outputs the input supply power to the first load.

At this time, when a short-circuit of the first load occurs, the second switch unit 140 controls the current supplied to the first load through comparison between the supply voltage input from the first switch 130 and a predetermined reference voltage .

More specifically, when the supply voltage is lower than the reference voltage as a result of the comparison between the supply voltage input from the first switch 130 and the preset reference voltage, the second switch unit 140 outputs the supply voltage to the first load.

5 is a circuit diagram showing the flow of current when the supplied voltage exceeds the reference voltage as a result of comparison between the supplied voltage and the reference voltage.

Referring to FIG. 5, the power supply unit 110 outputs a supply voltage to the first switch unit 130. Also, the signal generator 120 outputs a dark current cutoff signal to the first switch unit 130 and the second switch unit 140. The first switch unit 130 includes a driver 132 receiving the dark current cutoff signal output from the signal generating unit 120 and a bypass FET 134 receiving a supply voltage output from the power supply unit 110 can do. At this time, the driver 132 may be turned on or off according to the input of the dark current shutoff signal.

The first switch unit 130 outputs the supply voltage input from the power supply unit 110 to the second switch unit 140 and the second load when the dark current cutoff signal is input. Here, the second switch unit 140 may include a switch 142 receiving a supply voltage input from the first switch unit 130. The second switch unit 140 outputs the input supply power to the first load.

At this time, when a short-circuit of the first load occurs, the second switch unit 140 controls the current supplied to the first load through comparison between the supply voltage input from the first switch 130 and a predetermined reference voltage .

More specifically, when the supply voltage exceeds the reference voltage as a result of the comparison between the supply voltage input from the first switch 130 and the predetermined reference voltage, the second switch unit 140 prevents the supply voltage from being output to the first load . At this time, the output to the first load can be cut off by preventing the latch circuit 146 from being turned off and outputting the supply voltage.

6 is a flowchart illustrating a method of driving a power supply according to an embodiment of the present invention.

Referring to FIG. 6, the signal generator 120 outputs a dark current cutoff signal to the first switch unit 130 and the second switch unit 140 (S610). Here, the dark current represents a minimum current for maintaining the performance of the vehicle when the vehicle is completely turned off. At this time, as the output of the dark current increases, the time until the vehicle is discharged becomes shorter. Therefore, the signal generator 120 outputs the dark current cutoff signal, thereby preventing the discharge due to the long-time leaving of the vehicle.

In operation S620, the first switch unit 130 outputs the power supplied from the power supply unit 110 to the first load and the second load when the dark current cutoff signal is input. Here, the first switch unit 130 may include a driver 132 and a bypass FET 134. The driver 132 may turn on or off depending on whether the dark current shutoff signal is input, and output a dark current shutoff signal to the bypass FET 134. [ Also, the bypass FET 134 can output the supply voltage input from the power supply means 110 to the first load and the second load. At this time, when a short-circuit of the first load occurs, the current is controlled to prevent damage to the wire connected to the first load.

When the first load is short-circuited, the second switch unit 140 compares the supply voltage received from the first switch unit 130 with a reference voltage (S630). If the supply voltage is lower than the reference voltage as a result of comparison, the supply voltage input from the first switch unit 130 is output to the first load (S640).

On the other hand, if the supplied voltage exceeds the reference voltage as a result of the comparison between the supply voltage and the reference voltage at the first switch unit 130, the supply voltage input from the first switch unit 130 is blocked from being output to the first load (S650).

Here, the second switch unit 140 may compare the supply voltage with the reference voltage through the comparator 144. [ Further, the current can be controlled through the latch circuit 146 based on the comparison result of the supply voltage and the reference voltage. Further, the voltage output from the latch circuit 146 through the switch 142 can be output to the first load.

As described above, the present invention relates to a power supply apparatus for a vehicle and a driving method thereof, and more particularly, to a power supply apparatus for a vehicle and, more particularly, The present invention relates to a power supply device for a vehicle and a driving method thereof, which prevent damage to a wire due to the occurrence of a short circuit of a load.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Vehicle power supply
110: Power supply means
120:
130: first switch section
132: Bypass FET
134: Driver
140: second switch section
142: switch
144: comparator
146: latch circuit

Claims (10)

Power supply means disposed in the vehicle for outputting a supply voltage;
A signal generator for generating a dark current blocking signal; And
And a first switch unit for outputting the supply voltage to the second switch unit and the second load when the dark current cutoff signal is inputted,
The second switch unit
And switches the output of the supply voltage to the first load based on a result of comparison between a supply voltage input from the first switch unit and a preset reference voltage at the time of a short-circuit of the first load. The apparatus according to claim 1,
And a bypass FET for outputting the supply voltage to the first load and the second load. The apparatus according to claim 1,
A switch for outputting said supply voltage to said first load, a comparator for comparing said supply voltage with a predetermined reference voltage, and a latch circuit for switching output of said supply voltage to said first load, . The apparatus according to claim 3,
And supplies said supply voltage to said first load when said supply voltage is below said reference voltage. The apparatus according to claim 1,
And to block the supply voltage from being supplied to the first load when the supply voltage exceeds the reference voltage. Outputting a supply voltage to the second switch unit and the second load when the dark current shutoff signal is input to the first switch unit; And
Comparing the supply voltage with a predetermined reference voltage at the time of a short-circuit of the first load, and switching the supply voltage output to the first load based on the comparison result. 7. The method of claim 6, further comprising:
And outputs a supply voltage to the first load and the second load when the dark current blocking signal is input. 8. The method of claim 7, wherein in switching the supply voltage,
And comparing the supply voltage with a preset reference voltage to block outputting or outputting the supply voltage to the first load based on a result of the comparison. 9. The method of claim 8, further comprising:
And outputting the supply voltage to the first load when the supply voltage is lower than the reference voltage as a result of comparing the supply voltage and the reference voltage. 9. The method of claim 8, further comprising:
And when the supply voltage exceeds the reference voltage as a result of comparing the supply voltage and the reference voltage, the supply voltage is prevented from being output to the first load.

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