KR20190047480A - Apparatus for controlling charging and method thereof - Google Patents

Abstract

The present invention relates to an apparatus for controlling charging and a method thereof capable of eliminating the risk of burning an electric vehicle charging system due to noise. The apparatus for controlling charging comprises: a charging unit charging a battery mounted on the vehicle based on AC voltage from the system; and a control unit for monitoring the AC voltage to generate reference voltage, comparing the AC voltage and the reference voltage to detect noise applied to the AC voltage, and controlling the charging of the charging unit for the battery according to a detection result.

Description

[0001] APPARATUS FOR CONTROLLING CHARGING AND METHOD THEREOF [0002]

The present invention relates to a charging control apparatus and method, and more particularly, to a charging control apparatus and method for controlling charging of a battery mounted in an electric vehicle.

Recently, automobiles that generate power using environmentally friendly alternative energy have been actively developed at home and abroad. Such automobiles using alternative energy sources include pure electric vehicles (EV), fossil fuels and electric energy A hybrid electric vehicle (HEV), and a fuel cell electric vehicle (FCEV). Furthermore, the development of electric vehicles is being expanded to various mobile means such as miniature electric cars for single use, electric scooters, and electric bicycles.

Generally, an electric vehicle includes a battery charged with electric power for driving a three-phase motor, a three-phase motor driven by electric power charged in the battery to drive the electric vehicle, and an inverter for driving a three-phase motor . In this case, when the remaining power of the battery drops below a predetermined amount, it is necessary to charge the battery because the three-phase motor can no longer be driven. To this end, the commercial 220V AC voltage from the power network is rectified to charge the battery , A method of charging the battery using a separate charger has been applied.

On the other hand, when power is supplied from the power grid, noise such as a voltage drop due to various factors, transients, and the like may occur, and the quality of power supplied from the power grid may not be guaranteed. There are voltage sag RMS, flicker, notch, harmonic distortion waveforms, impulse transient, oscillatory transient, etc., which can be generated in the power grid. When such noise is applied to electric power from the power grid, And, in extreme cases, the OBC (On Board Charger) of an electric car may be damaged, resulting in a risk of fire.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2017-0006896 (published on Jan. 18, 2017).

An object of the present invention is to provide a charge control apparatus and method capable of eliminating the risk of burning an electric vehicle charging system due to noise applied to electric power supplied from a power grid, .

A charging control apparatus according to an aspect of the present invention includes a charging unit charging a battery mounted on a vehicle based on an AC voltage from a system, and a control unit generating the reference voltage by monitoring the AC voltage, And a controller for detecting noise applied to the AC voltage and controlling charging of the battery by the charging unit according to a result of the detection.

In the present invention, the control unit monitors the AC voltage to generate the reference voltage as a sinusoidal voltage having an amplitude equal to the amplitude of the AC voltage.

In the present invention, when the first zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage increases, the control unit sets the reference voltage as a positive sinusoidal voltage .

In the present invention, when a zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage is reduced, the control unit sets the reference voltage as a negative sinusoidal voltage .

In the present invention, the control unit inverts the AC voltage and the reverse phase of the reference voltage, respectively, and detects the noise applied to the AC voltage by comparing the AC voltage and the reference voltage, .

In the present invention, the control unit may obtain the frequency of the AC voltage based on a time difference between consecutive zero crossing points of the AC voltage, and generate the reference voltage so as to have a frequency synchronized with the obtained frequency. do.

In the present invention, the controller may determine whether a difference between the AC voltage and the reference voltage is equal to or greater than a preset threshold value, and detect a noise applied to the AC voltage.

In the present invention, the charging unit may include a slow charging unit charging a battery mounted on the electric vehicle based on the AC voltage, wherein when the noise applied to the AC voltage is detected, And the charging of the battery is stopped by setting a PWM (Pulse Width Modulation) duty of a pilot (CP) signal to a value of zero.

According to an aspect of the present invention, there is provided a charge control method, comprising: a control unit for generating a reference voltage by monitoring an AC voltage from a system, the control unit compares the AC voltage and the reference voltage, And controlling the charging of the battery by the charging unit that charges the battery mounted on the vehicle based on the AC voltage according to a result of the detection of the noise, do.

According to an aspect of the present invention, the risk of burning an electric vehicle charging system can be effectively removed through a method of confirming the quality of electric power supplied from a power network in advance and stopping charging of the electric vehicle when noise is applied.

1 is a block diagram illustrating a charge control apparatus according to an embodiment of the present invention.
2 is an exemplary diagram illustrating an embodiment of a charge control apparatus according to an embodiment of the present invention.
3 is an exemplary view showing a connector of a slow charger included in a charger in a charge control apparatus according to an embodiment of the present invention.
FIG. 4 and FIG. 5 are views illustrating an example of a hardware circuit configuration of a control unit and a waveform of a reference voltage in a charge control apparatus according to an embodiment of the present invention.
6 is a waveform diagram showing a comparison result between an AC voltage and a reference voltage in a charge control apparatus according to an embodiment of the present invention.
7 is a flowchart for explaining a charge control method according to an embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a charge control apparatus and method according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a block diagram illustrating a charge control apparatus according to an embodiment of the present invention. FIG. 2 is an exemplary view showing an embodiment of a charge control apparatus according to an embodiment of the present invention. 4 and 5 are views showing an example of a connector of a slow charging unit included in a charging unit in a charge control apparatus according to an embodiment of the present invention. FIG. 6 is a waveform diagram showing a comparison result between an AC voltage and a reference voltage in a charge control apparatus according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 1, the charge control apparatus according to an embodiment of the present invention may include a charging unit 100 and a control unit 200.

The charging unit 100 can charge the battery mounted on the vehicle based on an AC voltage from the system (power network) (hereinafter, the AC voltage is defined as an AC voltage supplied from the system). In this embodiment, the charger 100 may include one or more full-speed chargers ch1-ch5 for charging the battery mounted on the electric vehicle based on the AC voltage from the system as shown in Fig. As shown in FIG. 2, each slow charging unit included in the charging unit 100 can transmit and receive information on settlement information, charging power amount information, and the like through the TCP / IP communication with the operation server 300.

Also, in this embodiment, the charging unit 100 performs charging according to the J1772 protocol, and can apply AC power (AC 220V) from the system to the OBC (On Board Charger) of the electric vehicle. The slow charger included in the charger 100 may be configured to include a 5-pin or 7-pin connector as shown in FIG. 3. As will be described later, the slow charger receives a fault signal from the controller 200, It is possible to stop charging the battery of the electric vehicle by setting the CP (Control Pilot) signal duty to a value of zero.

The controller 200 monitors the AC voltage from the system to generate a reference voltage for noise detection, compares the AC voltage and the reference voltage to detect a noise applied to the AC voltage, The charging of the battery can be controlled. As shown in FIG. 2, the controller 200 receives the maximum available energy amount information from the operation server 300, calculates the number of vehicles connected to the current fully charged charger, calculates the chargeable power, And can be performed in a smart distribution switchboard that performs power distribution according to the amount of electric power available by transmitting information.

Hereinafter, the configuration of the present embodiment for generating a reference voltage to detect noise will be specifically described with reference to the operation of the control section 200. FIG.

As described above, since the AC power supplied from the power grid has noise such as Voltage sag RMS, Flicker, notch, harmonic distortion waveforms, impulse transient, and oscillatory transient, which may have a fatal impact on the charging system of the vehicle, In the example, the control section 200 can control the charging of the charging section 100 with respect to the battery by detecting the noise applied to the AC voltage (AC 220V having the commercial frequency (60 Hz)) from the system using the reference voltage.

Specifically, the control unit 200 monitors the AC voltage from the system and can generate the reference voltage as a sinusoidal voltage having the same amplitude as the amplitude of the AC voltage (Figs. 4 and 5 show an AC voltage And the reference voltage are shown to have different sizes). That is, since the AC voltage from the system is a voltage of a sinusoidal waveform having an amplitude of 220 V, the control unit 200 is a reference voltage for detecting noise applied to the AC voltage, and the control unit 200 outputs a voltage of a sinusoidal waveform having an amplitude of 220 V Can be generated.

At this time, when the first zero crossing point of the AC voltage is detected in the interval where the magnitude of the AC voltage increases, the control unit 200 can generate the reference voltage as the positive sinusoidal voltage . In this embodiment, the positive phase is defined as a period in which the voltage of the sinusoidal waveform has a positive magnitude, and the reverse phase is defined as the period in which the voltage of the sinusoidal waveform has a negative magnitude.

That is, the controller 200 detects a first zero crossing point of the AC voltage in a period where the magnitude of the AC voltage increases, determines the reference point as a reference point for generating the reference voltage, it is possible to detect the noise applied to the AC voltage by a method of generating a reference voltage as a sinusoidal voltage and comparing it with the AC voltage.

Further, when the second zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage decreases, the controller 200 can generate the reference voltage as a sinusoidal voltage in the reverse phase .

That is, since the phase of the AC voltage after the first zero crossing point has a phase difference of 180 degrees with respect to the phase of the AC voltage after the second zero crossing point, the controller 200 controls the phase of the reverse phase That is, the reference voltage is generated as a voltage in the form of a sin wave of 180 degrees out of phase with the above-described positive phase), and the noise applied to the AC voltage can be detected by a method of comparing the reference voltage with the AC voltage. 4 shows an example of a reference voltage as a sinusoidal voltage having a reference voltage as a positive sinusoidal waveform having a first zero crossing point as a starting point and an inverse phase sinusoidal waveform having a starting point at a second zero crossing point have.

Meanwhile, in the present embodiment, the controller 200 may detect the noise applied to the AC voltage by inverting the opposite phases of the AC voltage and the reference voltage, respectively, and comparing the AC voltage and the reference voltage, which are inverted in phase respectively.

That is, as shown in FIG. 5, after the inverse phase of the AC voltage is inverted through the rectifying diode and the reference voltage is also inverted in the opposite phase, the AC voltage and the reference voltage, The noise applied to the voltage can be detected. According to this embodiment, the AC voltage has a positive phase in all the sections according to the rectifying diode, and the reference voltage is also generated so as to have a positive phase in all sections, and only the zero crossing point of the AC voltage can be detected and compared , It is possible to further simplify the noise detection logic as compared with the above-described embodiment in which the voltage rise or the voltage decrease at the zero crossing point of the AC voltage must be judged.

Meanwhile, the control unit 200 of the present embodiment may acquire the frequency of the AC voltage based on the time difference between consecutive zero crossing points of the AC voltage, and generate the reference voltage so as to have the frequency synchronized with the obtained frequency.

That is, the commercial frequency of the AC voltage may fluctuate within a predetermined range according to the power supply / demand operation of the system on the basis of 60 Hz, so that the frequency of the AC power supplied from the system to the controller 200 may be varied. Since the present embodiment generates the reference voltage at the zero crossing point of the AC voltage, the frequency variation of the AC voltage does not greatly affect the noise detection accuracy (Fig. 6 (b)), 200 may acquire the frequency of the AC voltage based on the time difference between consecutive zero crossing points of the AC voltage and generate the reference voltage to have the frequency synchronized with the obtained frequency. For example, the controller 200 may monitor the time difference between successive zero-crossing points of the AC voltage input for a predetermined time to obtain the frequency of the AC voltage and generate the reference voltage having the obtained frequency. The frequency change of the AC power may be reflected to the reference voltage by repeating the operation according to the set period.

When the reference voltage is generated through the above-described process, the controller 200 may determine whether the difference between the AC voltage and the reference voltage is equal to or greater than a preset threshold value, and detect the noise applied to the AC voltage. The threshold value may be variously designed according to the frequency fluctuation range of the AC voltage that can be generated and the designer's intention and may be preset in the control unit 200.

When the noise applied to the AC voltage is detected as the difference between the AC voltage and the reference voltage is equal to or higher than the threshold value, the controller 200 can stop the charging of the battery 100 by the charging unit 100, The charging of the battery can be stopped by setting the PWM (Pulse Width Modulation) duty of the control pilot (CP) signal of the slow charging charger included in the battery pack to a value of zero.

That is, since the charge amount (amphere) of the slow charger can be calculated as " PWM duty of the CP signal * 0.6 " according to the J1772 protocol, the controller 200 sets the PWM duty of the CP signal to a value of 0, The control unit 200 may transmit a fault signal (current command signal) to the slow charging charger so that the slow charger can set the CP signal duty to a value of zero And the communication method between the controller 200 and the charger 100 (i.e., the slow charger) can be configured to be advantageous in terms of connectivity and expandability with the existing communication system by employing TCP / IP communication.

7 is a flowchart for explaining a charge control method according to an embodiment of the present invention.

Referring to FIG. 7, a charge control method according to an embodiment of the present invention will be described. First, the controller 200 monitors the AC voltage from the system to generate a reference voltage (S100).

In step S100, the control unit 200 monitors the AC voltage and can generate the reference voltage as a sinusoidal voltage having the same amplitude as the amplitude of the AC voltage. Specifically, when the first zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage increases, the controller 200 can generate a reference voltage as a positive sinusoidal voltage And a second zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage decreases, the reference voltage can be generated as a sinusoidal voltage in the reverse phase.

After detecting the first zero crossing point, the controller 200 calculates the phase of each of the reference voltages generated as the voltage of the alternating voltage and the positive phase sin wave form every time the zero crossing point of the alternating voltage is detected in step S100 And the noise applied to the AC voltage may be detected by comparing the AC voltage and the reference voltage whose phases are respectively inverted and inverted.

In step S100, the controller 200 may acquire the frequency of the AC voltage based on the time difference between consecutive zero-crossing points of the AC voltage, and may generate the reference voltage to have the frequency synchronized with the obtained frequency.

If the reference voltage is generated in step S100, the controller 200 compares the AC voltage and the reference voltage to detect the noise applied to the AC voltage (S200). In step S200, the controller 200 determines whether the difference between the AC voltage and the reference voltage is equal to or greater than a preset threshold value, and detects the noise applied to the AC voltage.

Then, the controller 200 controls charging of the charger 100 according to a result of detecting the noise (S300). If the noise applied to the AC voltage is detected in step S200, the controller 200 controls the PWM (Pulse Width Modulation) duty of the control pilot (CP) signal of the slow charger included in the charger 100 By setting it to a value of 0, charging to the battery can be stopped.

As described above, in this embodiment, the risk of burning of the electric vehicle charging system can be effectively removed through a method of confirming the quality of electric power supplied from the electric power network in advance and stopping charging of the electric vehicle when noise is applied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

100:
200:
300: Operation server

Claims (16)

A charging unit charging the battery mounted on the vehicle based on the AC voltage from the system; And
A controller for monitoring the AC voltage to generate a reference voltage, detecting a noise applied to the AC voltage by comparing the AC voltage and the reference voltage, and controlling charging of the battery by the charging unit according to the detection result, ;
The charge control device comprising:
The method according to claim 1,
Wherein the controller monitors the AC voltage to generate the reference voltage as a sinusoidal voltage having an amplitude equal to the amplitude of the AC voltage.
3. The method of claim 2,
The control unit generates the reference voltage as a sinusoidal voltage of a positive phase when a zero crossing point of the AC voltage is detected in a period where the magnitude of the AC voltage increases. .
3. The method of claim 2,
The control unit generates the reference voltage as a sinusoidal voltage in the reverse phase when a zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage decreases. .
3. The method of claim 2,
Wherein the control unit inverts the inverse phases of the alternating voltage and the reference voltage and detects a noise applied to the alternating voltage by comparing the alternating voltage and the reference voltage, Device.
3. The method of claim 2,
Wherein the control unit obtains the frequency of the AC voltage based on a time difference between consecutive zero crossing points of the AC voltage and generates the reference voltage so as to have a frequency synchronized with the obtained frequency, .
The method according to claim 1,
Wherein the control unit determines whether a difference between the AC voltage and the reference voltage is equal to or greater than a preset threshold value and detects a noise applied to the AC voltage.
The method according to claim 1,
Wherein the charging unit includes a slow charging unit charging a battery mounted on the electric vehicle based on the AC voltage,
Wherein the control unit sets the PWM (Pulse Width Modulation) duty of the control pilot (CP) signal of the slow charger to a value of 0 when the noise applied to the AC voltage is detected, And stops charging the battery.
The control unit comprising: monitoring an AC voltage from the system to generate a reference voltage;
The control unit comparing the AC voltage and the reference voltage to detect a noise applied to the AC voltage; And
Controlling the charging of the battery by a charger that charges the battery mounted on the vehicle based on the AC voltage according to a result of detecting the noise;
Wherein the charge control method comprises the steps of:
10. The method of claim 9,
In the step of generating the reference voltage,
Monitoring the AC voltage to generate the reference voltage as a sinusoidal voltage having an amplitude equal to the amplitude of the AC voltage.
11. The method of claim 10,
In the step of generating the reference voltage,
And generates the reference voltage as a sinusoidal voltage of a positive phase when a zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage increases. Way.
11. The method of claim 10,
In the step of generating the reference voltage,
And generates the reference voltage as a reverse sinusoidal voltage when a zero crossing point of the AC voltage is detected in a period in which the magnitude of the AC voltage decreases. Way.
11. The method of claim 10,
In the step of generating the reference voltage,
Inverting the AC voltage and the reference voltage, respectively, and comparing the AC voltage and the reference voltage, which are inverted in phase with each other, to detect the noise applied to the AC voltage.
11. The method of claim 10,
In the step of generating the reference voltage,
Acquiring a frequency of the AC voltage based on a time difference between successive zero crossing points of the AC voltage and generating the reference voltage so as to have a frequency synchronized with the obtained frequency.
10. The method of claim 9,
In the step of detecting the noise,
And determining whether a difference between the AC voltage and the reference voltage is equal to or greater than a preset threshold value, and detecting a noise applied to the AC voltage.
10. The method of claim 9,
Wherein the charging unit includes a slow charging unit charging a battery mounted on the electric vehicle based on the AC voltage,
In the step of controlling the charging,
When the noise applied to the AC voltage is detected, charging of the battery is stopped by setting a PWM (Pulse Width Modulation) duty of a control pilot (CP) signal of the slow charger to a value of 0 .

Images