KR101872831B1 - System and method for supplying power to external device of vehicle - Google Patents

Abstract

The present invention relates to a vehicle power supply system and a power supply method for supplying power to an external device, and more particularly, to a vehicle power supply system and a power supply method for supplying power to an external device using a socket A supply system and a power supply method.
According to another aspect of the present invention, there is provided an electronic control unit comprising: a receptacle for outputting a turn-on signal when a cover is opened; an inverter for converting DC power charged in the battery of the vehicle into AC power and outputting the AC power to the receptacle; And a detector for detecting a current amount and a leakage current output from the inverter unit. When the external device is connected, the control unit and the inverter unit are provided to operate even if the turn-on signal is not inputted, When the cover of the receptacle is opened, the power is automatically applied. When the cover is closed, the power is cut off. When the external device is connected, the power supply is maintained even if the surroundings become dark.

Description

TECHNICAL FIELD [0001] The present invention relates to a vehicle power supply system and a power supply method for supplying power to an external device,

The present invention relates to a vehicle power supply system and a power supply method for supplying power to an external device, and more particularly, to a vehicle power supply system and a power supply method for supplying power to an external device using a socket A supply system and a power supply method.

Generally, an outlet is a connecting device to be installed in an electric wiring. When a plug of an external device that requires power is connected, power can be supplied. Most of the outlets are installed on the wall in the building, but recently, the outlets have been installed in the vehicles.

However, since the battery mounted on the vehicle is charged with the DC power, the DC power of the battery is converted into the AC power using the AC inverter and supplied to the outlet. Further, an outlet provided in the vehicle is provided with an on-off switch for opening and closing the power source.

On the other hand, a conventional outlet used in a vehicle has a structure in which a driver or an occupant of the vehicle directly receives power by pressing or operating the on-off switch, so that the driver or the passenger must operate the on- There is a problem that troubles occur and user convenience is deteriorated.

Further, even when a plug of an external device is not connected due to a driver or a passenger misjudging, there is a problem that the on-off switch is kept in an on-state frequently, resulting in a loss of standby power.

In order to solve such a problem, the applicant of the present invention senses a brightness change when the cover is opened to connect a plug of an external device, and the power is automatically applied when the cover is closed. When the cover is closed, The present invention has proposed a vehicle outlet assembly (application No. 10-2015-0124591) equipped with an optical sensor that can be conveniently used without being manipulated.

However, in the above-described automotive outlet assembly, even if an external device is connected, the periphery is darkened and the power supply is automatically shut off when light is not detected by the optical sensor.

In addition, since the above-described automobile electrical outlet assembly has no means for detecting or determining whether or not there is a leakage current, there is a problem that the leakage current causes a user to be electrically charged.

Application No. 10-2015-0124591 (2015.09.03)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle power supply system and a power supply method in which power supply is not interrupted even when the surroundings are dark when an external device is connected and power is supplied have.

It is another object of the present invention to provide a vehicle power supply system and a power supply method that can cut off power supply depending on whether there is a leakage current.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a portable terminal comprising: a receptacle having a cover capable of opening and closing; a socket for outputting a turn-on signal for requesting power supply when the cover is opened; An inverter unit connected between the battery mounted on the vehicle and the receptacle, converting the DC power charged in the battery into AC power and outputting the AC power to the receptacle; And a control unit that receives the turn-on signal output from the receptacle unit and is switched to an operating state, and operates the inverter unit when the switch unit is turned to an operating state.

In a preferred embodiment, the apparatus further includes a detector connected between the inverter unit and the receptacle unit and detecting a current amount and a leakage current that are output from the inverter unit and supplied to an external device connected to the receptacle unit.

In a preferred embodiment, the control unit adjusts the PWM duty of the inverter unit according to the amount of the current detected by the detection unit, and stops the operation of the inverter unit when a leakage current is detected in the detection unit.

In a preferred embodiment of the present invention, when the amount of current supplied to the external device connected to the receptacle is continuously detected by the detection unit, the control unit maintains the operation state even when the turn-on signal is not inputted from the receptacle, .

In a preferred embodiment, the detecting unit includes: a video current transformer for detecting a current amount and a leakage current output from the inverter unit and outputting an electric signal corresponding thereto; And an amplifier for amplifying the electric signal output from the image transformer and outputting the amplified electric signal to the controller.

In a preferred embodiment, the detecting unit includes: a plurality of shunt resistors connected to respective phases of the output terminal of the inverter; A first amplifier connected to both ends of any one of the plurality of shunt resistors; An inverting amplifier connected to both ends of the other one of the plurality of shunt resistors; A comparator that compares the voltage values output from the first amplifier and the inverting amplifier, and outputs an electric signal corresponding to the difference; And a second amplifier for amplifying the electrical signal output from the comparator and outputting the amplified electrical signal to the controller.

In a preferred embodiment, the receptacle may include an optical sensor in which a resistance value changes according to a change in brightness depending on whether the cover is opened or not, and an output voltage increases or decreases according to a change in resistance value; And a transistor which is electrically connected to the photosensor and outputs a turn-on signal to the controller when an output voltage of a predetermined reference voltage or more is applied from the photosensor.

Further, the present invention provides a power supply method performed in a vehicle power supply system, comprising: (1) outputting a turn-on signal to the control unit when the cover of the receptacle is opened; (2) controlling the inverter unit by operating the inverter unit in response to the turn-on signal; And (3) the inverter unit converts the DC power charged in the battery of the vehicle into an AC power under the control of the control unit and outputs the AC power to the outlet unit.

In a preferred embodiment, the step (3) further includes: (4) detecting a current amount and a leakage current that are output from the inverter unit and supplied to an external device connected to the socket unit .

In a preferred embodiment, after the step (4), (5) the control unit adjusts the PWM duty of the inverter unit according to the amount of the current detected by the detection unit, and when a leakage current is detected in the detection unit, And stopping the operation.

In a preferred embodiment, in the step (5), when the amount of current supplied to the external device connected to the receptacle part by the detection part is continuously detected, even if the turn-on signal is not inputted from the receptacle part And maintains the operating state and controls the inverter section.

In a preferred embodiment, the detecting unit includes a video current transformer and an amplifier. In the step (4), the video current transformer detects an amount of current and a leakage current output from the inverter unit to output an electric signal, The electric signal outputted from the current transformer is amplified by the amplifier and outputted to the controller.

In a preferred embodiment, the detecting unit includes a plurality of shunt resistors, a first amplifier, an inverting amplifier, a comparator, and a second amplifier, and the fourth step includes detecting at both ends of any one of the plurality of shunt resistors The voltage value detected at both ends of the other one of the plurality of shunt resistors is amplified and output by the inverting amplifier and the comparator compares the voltage value detected by the first amplifier with the voltage detected by the first amplifier, And outputs the electrical signal according to the difference. The electrical signal output from the comparator is amplified by the second amplifier and output to the control unit.

In a preferred embodiment, the receptacle includes a photosensor and a transistor, wherein the photosensor senses a change in brightness depending on whether the cover is opened or not, changes the resistance value, The transistor outputs a turn-on signal to the control unit when an output voltage of a predetermined reference voltage or more is applied from the photosensor.

According to an embodiment of the present invention, there is provided an electric power steering apparatus comprising: a receptacle for outputting a turn-on signal for requesting power supply when a cover is opened; an inverter unit for converting a DC power charged in the battery of the vehicle into an AC power, And a detector for detecting the leakage current and the amount of current output from the inverter unit. Therefore, when the cover of the receptacle is opened, the power is automatically applied, When the cover is closed, the power is automatically turned off.

Further, when the amount of current supplied to the external device is continuously detected, the control unit and the inverter unit operate even if the turn-on signal of the receptacle unit is not inputted, so that the power can be continuously supplied to the external device even if the surroundings are dark .

Further, the present invention can detect the amount of current and the leakage current output from the inverter unit, stop the operation of the inverter unit if there is a leakage current, and prevent an electric shock due to a leakage current.

1 is a view for explaining a power supply system for a vehicle according to an embodiment of the present invention;
2 is a diagram for explaining an operational process of a vehicle power supply system;
3 is a view for explaining a receptacle portion configured in a vehicle power supply system;
4 is a view for explaining a first embodiment of a detection unit constituted in a vehicle power supply system;
5 is a view for explaining a second embodiment of a detection unit constituted in a vehicle power supply system;
6 is a view for explaining a vehicle power supply method according to an embodiment of the present invention.

It should be understood that the specific details of the invention are set forth in the following description to provide a more thorough understanding of the present invention and that the present invention may be readily practiced without these specific details, It will be clear to those who have knowledge.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to FIGS. 1 to 6, and a description will be given centering on the parts necessary for understanding the operation and operation according to the present invention.

FIG. 1 is a view for explaining a power supply system for a vehicle according to an embodiment of the present invention. FIG. 2 is a view for explaining an operation procedure of a power supply system for a vehicle. FIG. 4 is a view for explaining a first embodiment of a detection unit constituted in a vehicle power supply system, and FIG. 5 is a diagram for explaining a second embodiment of a detection unit constituted in the vehicle power supply system FIG.

1 to 5, a vehicular power supply system according to an embodiment of the present invention includes a receptacle 110, an inverter 120, a detector 130, and a controller 140.

Here, the vehicle power supply system according to an embodiment of the present invention is implemented so that the charging power of the battery 10 mounted on the vehicle can be supplied to the external device 20 possessed by the user. In addition, the above-mentioned vehicle includes both a vehicle equipped with an engine using petroleum fuel and an electric vehicle using electricity, and the battery 10 includes a low-voltage battery of an engine-mounted vehicle, a high- All included.

The receptacle 110 is installed inside or outside the vehicle, and can connect a plug of an external device 20 that requires power supply. The receptacle 110 includes an optical sensor 111, a transistor 112, and a variable resistor 113, including a cover that can be opened and closed, and a plug connection terminal connected to the inverter unit 120, .

In addition, the optical sensor 111 senses a change in brightness depending on whether the cover is opened or not, and the resistance value changes, and the output voltage increases or decreases according to the change of the resistance value. The light sensor 111 may be a light sensor.

The transistor 112 is connected to the optical sensor 111. When the output voltage of the optical sensor 111 exceeds a predetermined reference voltage, the transistor 112 is turned on, And outputs a signal. The turn-on signal enables the control unit 140 and the inverter unit 120, which will be described later, to operate to supply power to the receptacle unit 110.

The variable resistor 113 is connected in series to the optical sensor 111 and adjusts the sensing sensitivity by adjusting the output voltage according to the resistance value of the optical sensor 111. [

That is, when the user opens the cover to connect the plug of the external device 20, the receptacle 110 senses the light by the light sensor 111 and the output voltage increases. A turn-on signal is output to the power supply unit 140 and power is supplied to the receptacle unit 110.

When the cover of the receptacle 110 is closed and darkened, the output voltage of the optical sensor 111 decreases and the power supply is interrupted because the transistor 112 does not output a turn-on signal.

The inverter unit 120 is connected between the battery 10 and the receptacle unit 110 and supplies the DC power charged in the battery 10 to the AC power source under the control of a control unit 140 And outputs the converted signal to the receptacle 110.

In addition, the inverter unit 120 may output 220 V AC power, and the PWM duty may be adjusted according to a control signal input from the controller 140 to increase or decrease the output voltage. The AC power output from the inverter unit 120 is applied to the external device 20 connected to the receptacle 110 through the plug connection terminal of the receptacle 110. [

The inverter unit 120 may be provided with an AC inverter. The inverter unit 120 may be turned off during normal operation, turned on by the control unit 140, and may convert the DC power into AC power and output the AC power. And then turned off by the control unit 140 again.

The detection unit 130 is connected between the inverter unit 120 and the receptacle unit 110 and is connected to an external device that is output from the inverter unit 120 and is connected to the receptacle unit 110, And outputs a corresponding electric signal to the controller 140, which will be described later.

That is, the detecting unit 130 detects and feeds back the output voltage or the output current output from the inverter unit 120 so that the control unit 140 can determine whether the inverter unit 120 is operating normally And also detects the presence of a leakage current between the inverter unit 120 and the receptacle unit 110 and performs feedback.

For this, the detection unit 130 may be implemented using various types of sensing devices.

For example, as shown in FIG. 4, the detection unit 130 may include a video current transformer 131 and an amplifier 132. An isolation device including an opto-coupler and an isolation amplifier may be further provided between the detection unit 130 and the output unit of the inverter unit 120. Also, the output voltage or the output current output from the inverter unit 120 may be detected through the above-described insulation device.

Here, the voltage transformer 131 detects the amount of current output from each phase of the output stage of the inverter unit 120, and outputs an electric signal corresponding to the vector sum. Generally, if there is no leakage current, the vector sum is '0'.

The amplifier 132 amplifies the electric signal output from the image deflector 131 and outputs the amplified electric signal to the controller 140. Using this, the controller 140 can check whether the output voltage of the inverter unit 120 and the leakage current are present.

5, the detector 130 includes a plurality of shunt resistors 133 and 134, a first amplifier 135, an inverting amplifier 136, a comparator 137, and a second amplifier 138, As shown in FIG. In this case as well, the above-described insulating element may further be provided between the detecting unit 130 and the output terminal of the inverter unit 120. [

The plurality of shunt resistors 133 and 134 are connected to respective phases of the output terminal of the inverter unit 120. The first amplifier 135 is connected to both ends of one of the plurality of shunt resistors 133 and 134 and the inverting amplifier 136 is connected to both ends of the plurality of shunt resistors 133 and 134 And is connected to both ends of the other one 134.

The comparator 137 compares the voltage value amplified in the first amplifier 135 with the voltage value inverted and amplified in the inverting amplifier 136, and outputs an electric signal corresponding to the difference .

The electric signal outputted from the comparator 137 is outputted to the second amplifier 138 and the second amplifier 138 amplifies the electric signal and outputs the amplified electric signal to the controller 140. Using this, the controller 140 can check whether the output voltage of the inverter unit 120 and the leakage current are present.

The control unit 140 controls the inverter unit 120 to operate the inverter unit 120 so that power can be supplied to the external device 20 connected to the receptacle unit 110.

The controller 140 controls the PWM duty of the inverter 120 according to the amount of the current detected by the detector 130. When the leakage current is detected by the detector 130, It is possible to perform the function of stopping the operation of the controller.

On the other hand, when the control unit 140 is normally operated, the standby current is consumed unnecessarily. Therefore, the control unit 140 is switched to the standby state during normal operation, and the turn-on signal output from the receptacle unit 110 And is switched to an operating state. When the control unit 140 is in the standby state, the inverter unit 120 is also turned off.

In addition, when the control unit 140 is switched to the operating state, the inverter unit 120 is turned on to perform a power conversion operation. If the turn-on signal is not output from the receptacle 110, the controller 140 turns off the inverter 120 and switches to the standby state.

If the amount of current supplied to the external device 20 connected to the receptacle 110 is continuously detected by the detection unit 130, the control unit 140 controls the turn- The inverter unit 120 can be controlled while maintaining the operating state.

That is, since the socket unit 110 does not output a turn-on signal when the surroundings are dark even when the external device 20 to which power is supplied is connected, the controller 140 disconnects the external device 20 The inverter unit 120 is controlled to continue operation until the connection of the external device 20 is released and when the turn-on signal is not output from the receptacle 110, the inverter unit 120 is switched to the standby state.

6 is a view for explaining a power supply method for a vehicle according to an embodiment of the present invention.

Referring to FIG. 6, a vehicle power supply method performed in a vehicle power supply system according to an embodiment of the present invention will be described.

However, since the functions performed in the vehicle power supply method shown in FIG. 6 are all performed in the vehicle power supply system described with reference to FIGS. 1 to 5, all of the functions described with reference to FIGS. 1 to 5 It should be noted that the function is performed in the vehicular power supply method according to the preferred embodiment of the present invention, and all the functions described with reference to Fig. 6 are performed in the vehicular power supply system according to the preferred embodiment of the present invention.

First, when the cover of the receptacle is opened, the receptacle outputs a turn-on signal for requesting power supply to the controller (S110).

In this case, the receptacle may have a structure including an optical sensor and a transistor, and the optical sensor senses a change in brightness depending on whether the cover is opened or not, changes the resistance value, and increases or decreases Output the output voltage.

An output voltage output from the optical sensor is input to the transistor, and the transistor outputs a turn-on signal to the controller when an output voltage greater than a predetermined reference voltage is applied from the optical sensor.

Next, the control unit receives the turn-on signal and switches to the operating state to operate the inverter unit (S120).

Next, under the control of the control unit, the inverter unit converts the DC power charged in the battery of the vehicle into an AC power and performs a power conversion operation to output the AC power to the receptacle (S130).

Next, the detection unit detects the amount of current and the leakage current that are output from the inverter unit and supplied to the external device connected to the receptacle unit (S140).

In this case, the detection unit may include a video current transformer and an amplifier. The video current transformer detects a current amount and a leakage current output from each of the output terminals of the inverter unit and outputs an electric signal corresponding thereto, Is amplified by the amplifier and output to the controller.

The detecting unit may include a plurality of shunt resistors, a first amplifier, an inverting amplifier, a comparator, and a second amplifier, wherein the plurality of shunt resistors are provided on respective phases of the inverter output, A first amplifier is connected across the one of the plurality of shunt resistors and the inverting amplifier is connected across the other of the plurality of shunt resistors.

The voltage values amplified and output from the first amplifier and the inverting amplifier are input to the comparator. The comparator compares the voltage values output from the first amplifier and the inverting amplifier, And an electric signal output from the comparator may be amplified by the second amplifier and output to the controller.

Then, the control unit adjusts the PWM duty of the inverter unit according to the amount of the current detected by the detection unit, or stops the operation of the inverter unit according to whether the leakage current is detected (S150).

At this time, when the load connected to the socket unit, that is, the amount of current supplied to the external device is continuously detected by the detection unit, the control unit maintains the operation state even when the turn-on signal is not inputted from the socket unit, (S151).

If the output voltage is higher than the reference voltage, the control unit decreases the PWM duty of the inverter unit to adjust the output voltage (S153). If the output voltage is higher than the reference voltage, If the voltage is lower than the reference voltage, the PWM duty of the inverter unit is increased to adjust the output voltage of the inverter unit (S154).

Meanwhile, if the leakage current is detected in the detection unit (S155), the control unit may turn off the inverter unit and stop the operation (S160).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

110:
111: optical sensor 112: transistor
113: Variable resistance
120: inverter section
130:
131: Video transformer 132: Amplifier
133, 134: Shunt resistor 135: First amplifier
136: inverting amplifier 137: comparator
138: Second amplifier
140:

Claims (14)

A receptacle for outputting a turn-on signal for requesting power supply when the cover is opened;
An inverter unit connected between the battery mounted on the vehicle and the receptacle, converting the DC power charged in the battery into AC power and outputting the AC power to the receptacle;
A control unit that receives the turn-on signal output from the receptacle unit and switches to an operation state and operates the inverter unit when the switch unit is turned to an operation state; And
And a detection unit connected between the inverter unit and the socket unit and detecting a current amount and a leakage current outputted from the inverter unit and supplied to an external device connected to the socket unit,
Wherein,
The PWM duty of the inverter unit is adjusted according to the amount of the current detected by the detection unit, and when the leakage current is detected in the detection unit, the operation of the inverter unit is stopped, and the amount of current supplied to the external device connected to the socket unit by the detection unit continues Wherein the control unit controls the inverter unit to maintain the operating state even if no turn-on signal is input from the receptacle unit.
delete delete delete The method according to claim 1,
Wherein:
A video current transformer for detecting a current amount and a leakage current output from the inverter unit and outputting an electric signal corresponding thereto; And
And an amplifier for amplifying an electric signal output from the image deflector and outputting the amplified electric signal to the controller.
The method according to claim 1,
Wherein:
A plurality of shunt resistors connected to each phase of the inverter output stage;
A first amplifier connected to both ends of any one of the plurality of shunt resistors;
An inverting amplifier connected to both ends of the other one of the plurality of shunt resistors;
A comparator that compares the voltage values output from the first amplifier and the inverting amplifier, and outputs an electric signal corresponding to the difference; And
And a second amplifier for amplifying the electric signal output from the comparator and outputting the amplified electric signal to the controller.
7. The method according to any one of claims 1, 5 and 6,
The socket-
An optical sensor for detecting a change in brightness according to whether the cover is open or not and changing a resistance value and increasing or decreasing an output voltage according to a change in resistance value; And
And a transistor which is electrically connected to the optical sensor and outputs a turn-on signal to the control unit when an output voltage equal to or higher than a predetermined reference voltage is applied from the optical sensor.
A power supply method performed in a vehicle power supply system,
(1) when the cover of the receptacle is opened, a step of outputting a turn-on signal to the control section, in which the receptacle section requests power supply;
(2) controlling the inverter unit by operating the inverter unit in response to the turn-on signal;
(3) The inverter unit converts the DC power charged in the battery of the vehicle into an AC power under the control of the control unit and outputs the AC power to the outlet unit;
(4) detecting a current amount and a leakage current that are output from the inverter unit and supplied to an external device connected to the receptacle unit; And
(5) The control unit adjusts the PWM duty of the inverter unit according to the amount of the current detected by the detection unit, and stops the operation of the inverter unit when a leakage current is detected in the detection unit.
In the step (5)
Wherein when the amount of current supplied to the external device connected to the receptacle unit is continuously detected by the detection unit, the control unit controls the inverter unit while maintaining the operating state even if the turn-on signal is not inputted from the receptacle unit .
delete delete delete 9. The method of claim 8,
Wherein the detecting unit includes a video current transformer and an amplifier,
The method of claim 1, wherein, in the step (4), the image current transformer detects an amount of current and a leakage current output from the inverter unit to output an electric signal, and the electric signal output from the image current transformer is amplified by the amplifier, Wherein the power supply is a power supply.
9. The method of claim 8,
Wherein the detector comprises a plurality of shunt resistors, a first amplifier, an inverting amplifier, a comparator and a second amplifier,
The step (4)
A voltage value detected at both ends of any one of the plurality of shunt resistors is amplified and output by the first amplifier and a voltage value detected at both ends of the other one of the plurality of shunt resistors is amplified by the inverting amplifier And the comparator compares the voltage values output from the first amplifier and the inverting amplifier, and outputs an electrical signal corresponding to the difference. The electrical signal output from the comparator is amplified by the second amplifier, And outputting the power to the control unit.
The method according to any one of claims 8, 12 and 13,
Wherein the receptacle includes an optical sensor and a transistor,
The step (1)
The optical sensor detects a change in brightness according to whether the cover is opened or not and outputs an output voltage which is increased or decreased according to a change in resistance value, And a turn-on signal is output to the control unit when an output voltage is applied.

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