KR20190061169A - Apparatus and method for controlloing converter for charging battery of vehicle - Google Patents

Abstract

Disclosed is a converter control apparatus for charging a battery of vehicles, which converts high voltage power to output low voltage power used as power supply of a vehicle′s electric load and charging power of the battery. The converter control apparatus for charging a battery of vehicles comprises: a current command generation unit for generating a charging current command based on the difference between the high efficiency point current preset for the converter and the load current provided to the electric load; and a control value generation unit for generating a control value for causing a battery current measured value detected at a terminal of the battery to follow the charging current command. The output voltage command of the converter is generated by reflecting the control value to a preset initial output voltage command.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and method for controlling a battery charging converter of a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for controlling a battery charging converter for a vehicle, and more particularly to an apparatus and method for charging a battery of a vehicle capable of controlling a charging current output from a converter Converter control apparatus and method.

BACKGROUND ART An environmentally friendly vehicle using electric energy such as a hybrid car and an electric car has a main battery of a high voltage which provides electric energy to a motor for driving the vehicle and a secondary battery which provides power supply power such as electric load of the vehicle. A low voltage DC-DC converter (LDC) is provided between the main battery and the auxiliary battery so that the high-voltage power of the main battery can be converted into a low voltage to provide charging power of the auxiliary battery.

Conventionally, the LDC has been operated in a constant voltage control mode in which the specific voltage value set in the voltage command map is set as the output voltage command in consideration of the vehicle condition, and the actual output voltage follows the set output voltage command.

On the other hand, the auxiliary battery receives the output of the LDC as charging power. The charging current is determined by the LDC output voltage, the open circuit voltage of the auxiliary battery, the internal resistance of the auxiliary battery, and the line resistance between the LDC and the auxiliary battery. Here, since the line resistance, the auxiliary battery internal resistance, and the open circuit voltage of the auxiliary battery may be changed depending on the state of charge and temperature of the auxiliary battery, if the LDC output voltage is fixedly controlled in the form of constant voltage, Can not be determined manually depending on the state of charge, temperature, etc. of the auxiliary battery.

As described above, according to the conventional LDC control technique, the charge current provided by the auxiliary battery can not be actively controlled in real time, and thus unnecessary energy is frequently provided for charging the auxiliary battery, thereby deteriorating the fuel efficiency of the vehicle Causing problems.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as an admission that the prior art is known to those skilled in the art.

KR 10-2008-0111194A

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an apparatus and method for controlling a battery charging converter of a vehicle capable of actively and real-time controlling a charging current output from a converter that provides charging power for charging an auxiliary battery of a vehicle. We will do it.

According to an aspect of the present invention,

1. A battery charging converter control apparatus for a vehicle, which converts high-voltage power to output a low-voltage power used as a power source of a vehicle's electric field load and a charging power of the battery,

A current command generator for generating a charging current command based on a difference between a high efficiency point current preset for the converter and a load current provided to the electric load; And

And a control value generator for generating a control value for causing the battery current actual value detected at the terminal of the battery to follow the charge current command,

And generates an output voltage command of the converter by reflecting the control value to a predetermined initial output voltage command.

In an embodiment of the present invention, the current command generation unit may determine a value obtained by subtracting the actual measured value of the battery current from the actually measured converter output current value detected at the output terminal of the converter as the load current.

In one embodiment of the present invention, the current command generation unit may limit the charge current command to 0 when the load current is larger than the high efficiency point current.

In one embodiment of the present invention, the control value generator may derive the control value by performing a proportional-integral control on the difference between the measured actual value of the battery current detected at the terminal of the battery and the charge current command.

In one embodiment of the present invention, when the load current becomes a derating state in which the load current is larger than the rated capacity of the converter, the control value generator sets the difference between the battery current actual value detected at the battery terminal and the charge current command to 0 .

In an embodiment of the present invention, the control apparatus further includes an initial command generator for determining an actual output value of the converter output voltage detected at the output terminal of the converter at the start of operation of the battery charging converter control device of the vehicle as the initial output voltage command .

In an embodiment of the present invention, the control value generator may limit the control value between a value obtained by subtracting the initial output voltage command from a preset battery allowable upper / lower limit voltage value.

In an embodiment of the present invention, the control value generator may further comprise: a control value generating unit for generating a control value corresponding to a difference between an actual measured value of the converter output voltage detected at the output terminal of the converter and an actual measured value of the battery voltage detected at the battery terminal And a voltage drop compensation unit for giving a margin to the voltage drop compensation unit.

According to another aspect of the present invention,

1. A battery charging converter control apparatus for a vehicle, which converts high-voltage power to output a low-voltage power used as a power source of a vehicle's electric field load and a charging power of the battery,

An initial command generator for determining an actual output voltage command value of the converter output voltage detected at an output terminal of the converter as an initial output voltage command; A current command generator for generating a current command and a control value generator for generating a control value for causing the battery current actual value detected at the terminal of the battery to follow the charge current command, A charge current controller for generating a first output voltage command for the converter by reflecting the control value;

A constant voltage control unit for generating a second output voltage command for the converter derived using a predetermined voltage command map based on the state of the vehicle;

A signal selection unit for determining whether the charge current control unit and the constant voltage control unit operate or not and selecting one of the first output voltage instruction and the second output voltage instruction and outputting the selected one; And

A pulse width modulation integrated element for generating a pulse width modulated signal for controlling a switching element in the converter based on a difference between an output voltage command selected by the signal selector and an actual value of the output voltage;

And a controller for charging the battery of the vehicle.

In one embodiment of the present invention, the initial command generation unit sets the actual output value of the converter output voltage detected at the output terminal of the converter at the time when the operation of the constant voltage control unit is stopped and the operation of the charge current control unit is started, .

According to another aspect of the present invention,

A control method of a battery charging converter for a vehicle that converts high voltage power and outputs low voltage power used as a power source of a vehicle full load and a charging power of the battery,

Determining an actual output voltage command value of the converter detected at the output terminal of the converter at the time of starting the control method of the battery charging converter as an initial output voltage command;

Generating a charging current command based on a difference between a predetermined high efficiency point current for the converter and a load current provided by the electric field load;

Generating a control value for causing the measured actual value of the battery current detected at the terminal of the battery to follow the charging current command; And

Generating an output voltage command of the converter by reflecting the control value to the initial output voltage command;

The present invention provides a method of controlling a battery charging converter for a vehicle.

According to the apparatus and method for controlling the charging of the battery of the vehicle, the charging current output to the auxiliary battery for charging can be actively controlled while adjusting the converter output voltage command, so that the charging current is unnecessarily provided It is possible to control the battery current at zero current and select the optimal charging condition to provide a desired amount of charging current to the secondary battery.

In other words, according to the apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention, the voltage command of the converter can be appropriately adjusted to control the auxiliary battery charging current, thereby maximizing the energy efficiency of the auxiliary battery Fuel efficiency of the vehicle can be improved.

Therefore, according to the apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention, the number of times the energy is charged / discharged by the auxiliary battery can be minimized, Which can lead to improved product quality and lower service costs.

1 is a block diagram schematically showing a power system of a vehicle to which an apparatus and a method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention are applied.
2 is a schematic block diagram of a converter control device for charging a battery of a vehicle according to an embodiment of the present invention.
3 is a block diagram showing in detail an auxiliary battery charging current control unit of a converter control apparatus for a battery of a vehicle according to an embodiment of the present invention.
4 to 6 are graphs showing simulation results of an apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention.

Hereinafter, an apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a power system of a vehicle to which an apparatus and a method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention are applied.

1, an apparatus 100 for controlling a battery charging converter for a vehicle according to various embodiments of the present invention is for controlling a low-voltage DC-DC converter (LDC) 10. As shown in Fig.

The LDC 10 is provided between the auxiliary battery 20 and the main battery 30. The auxiliary battery 20 is a battery having a relatively low voltage output (e.g., 10-14 V) that provides power to various electric loads 40 applied to the vehicle. The main battery 30 is a battery having a high voltage output (for example, several tens to several hundreds of volts) for supplying electric power to a driving motor for driving the vehicle. The LDC 10 converts the high voltage power of the main battery 30 and outputs it with a low voltage power.

Meanwhile, the LDC 10, the auxiliary battery 20, and the electric field load 40 can form a connection at one node using the same elements as the junction box 50. [ That is, the output voltage Vo and the output current Io of the LDC 10 can be supplied through the junction box 50 as the charging voltage Vbat and the charging current Ibat of the auxiliary battery 20, Or may be provided as a power source for the load 40. [ Likewise, the power stored in the auxiliary battery 20 may be provided to the electric field load 40 via the junction box 50.

In such a vehicle power system, the converter control apparatus 100 according to various embodiments of the present invention calculates the commands for controlling the output voltage and the output current of the LDC 10 and outputs the commands to the LDC 10 It is possible to generate and output a pulse width modulation (PWM) signal for driving the switching device.

The converter control apparatus 100 according to various embodiments of the present invention controls a switching element in the LDC 10 to control a desired voltage A PWM signal for outputting or a PWM signal for outputting a desired current can be generated. The PWM control of the switching device of the LDC 10 corresponds to a well-known technology in the field of converters, and a PWM integrated device (IC) for generating a PWM signal exists in the form of a commercialized product. .

Various embodiments of the invention relate to techniques for generating a voltage command of the LDC 10 that a PWM integrated device (IC) is required to generate a PWM signal.

2 is a schematic block diagram of a converter control device for charging a battery of a vehicle according to an embodiment of the present invention.

2, a converter control device for a battery of a vehicle according to an embodiment of the present invention includes a first voltage command Vref1 * of the LDC 10 for controlling the charging current of the auxiliary battery 20 A constant voltage controller 130 for generating a second voltage command Vref2 * for controlling the auxiliary battery charging current controller 110 and the LDC 10 to generate a first voltage command Vref1 * and a second voltage command Vref2 * And a voltage command Vref2 *; an LDC output current limiting unit 150 for providing a correction value applied depending on whether or not the LDC output current is limited to the voltage command selected by the signal selection unit 150 For controlling a switching element in the LDC 10 based on a difference between a final command in which a correction value is reflected in the voltage command selected by the signal selection unit 150 and an actual output voltage value detected at the output terminal of the LDC 10 And a PWM IC 190 for generating a PWM signal. The.

As described above, since various embodiments of the present invention are for appropriately controlling the charging current provided to the auxiliary battery 20 in the LDC 10, the LDC 10 for controlling the charging current of the auxiliary battery 20 And the auxiliary battery charging current controller 110 generates the first voltage command Vref1 *.

The constant voltage controller 130 is an element for determining a voltage command (second voltage command Vref2 *) corresponding to the vehicle state using a predetermined voltage command map as described in the background art, and the signal selector 150 The first voltage command Vref1 * for controlling the battery charge current according to whether the auxiliary battery is charged or the command of the host controller, and the second voltage command Vref2 * for constant voltage control. The signal selection unit 150 can determine whether to operate the two as well as select one of the voltage commands generated by the charge current controller 110 and the constant voltage controller 130, respectively. That is, when control for determining the charging current of the auxiliary battery 20 is required through the operation of the charging current control unit 110, the charging current control unit 110 may be operated and the operation of the constant voltage control unit 130 may be stopped , And vice versa. The signal selection unit 150 may control the other one operation to be stopped when one of the charging current control unit 110 and the constant voltage control unit 130 operates.

Further, the LDC output current limiting section 170 is a component that provides a correction value of the voltage command that can limit the output current of the LDC 10 when the load of the vehicle becomes equal to or larger than the rated capacity of the predetermined LDC 10 to be.

The PWM IC 190 is a PWM (Pulse Width Modulation) circuit that can PWM-control a switching element in the LDC 10 so that the actual value of the LDC output voltage can follow the final voltage command based on the error between the final voltage command and the actual value of the LDC output voltage Can be a commercial IC component that generates a signal

3 is a block diagram showing in detail an auxiliary battery charging current control unit of a converter control apparatus for a battery of a vehicle according to an embodiment of the present invention.

3, the auxiliary battery charging current control unit 110 includes an initial command generation unit 111, a current command generation unit 113, a control value generation unit 115, and a voltage drop compensation unit 117 And the like.

The initial command generator 11 is an element for generating an initial command to be applied when the operation of the charge current controller 110 is started. The initial command generation unit 11 maintains and outputs the converter output voltage Vo_sen detected at the output terminal of the converter 10 when the converter 10 is in operation and the control by the constant voltage control unit 13 is terminated. That is, the converter output voltage detected at the output end of the converter at the time when the control of the constant voltage control unit 13 ends or when the charge current control unit 110 starts operating is determined as the initial output voltage command Vcmd for current control . For this, the initial command generator 111 may include a sample-and-hold circuit 310 that samples the converter output voltage detection value and maintains the value at a specific point in time and outputs the same.

The current command generation section 113 generates the current command Io * of the converter 10 and the electric field load connected to the output terminal of the converter 10 according to the design or specifications of the converter 10 And generates battery charge current command Ibat * based on the difference of load current Iload.

It is difficult to measure the total load at a certain point because the electric field load changes instantaneously according to the driver's intention and is dispersed throughout the vehicle. In consideration of this point, the current command generation section 113 outputs the battery current actual value Ibat detected at the terminal of the auxiliary battery 20 at the converter output current actual value Io_est detected at the output terminal of the converter 10 The subtracted value is regarded as the load current (Iload).

At this time, when the load current Iload is larger than the high efficiency point current Io *, the current command generation section 113 determines that the load current Iload is larger than the high efficiency point current Io * Limit battery charge current command (Ibat *) to 0 (zero). For this limitation, a limiter 330 may be provided.

On the other hand, the current command generation section 113 generates the current command Io * and the load current Iload in the case where the efficiency is good due to regenerative braking or the like during driving of the vehicle, that is, It is possible to generate the battery charge current command Ibat * by reflecting the charge current addition amount Ibat_add * to the value corresponding to the battery charge current command Ibat_add *.

The control value generation unit 115 generates a control value for determining the current output voltage command through the feedback control. The control value generated by the control value generator 115 is added to the initial output voltage command Vcmd determined by the initial command generator 111 to determine the output voltage command Vref * (Vref1 * in FIG. 2).

The control value generating unit 115 generates a control value for causing the battery current actual value Ibat detected at the terminal of the battery 20 to follow the charge current instruction Ibat * generated by the current command generating unit 113 . Specifically, the control value generating unit 115 can generate the control value by inputting the difference between the charging current instruction Ibat * and the battery current measured value Ibat into the proportional-plus-integral controller 355. [

The control value generator 115 also includes a limiter 130 that limits the battery current actual value Ibat detected at the terminal of the battery 20 to a predetermined value or more before calculating the difference between the battery current command value Ibat * And a mux 353 for outputting 0 instead of the charge current command Ibat * when the load current is larger than the rated capacity of the converter 10 and becomes the derating state (DRT_state).

In addition, the control value generator 115 may include a limiter 357 for limiting the generated control value to a predetermined range. The limiter 357 is for preventing the output voltage command Vcmd from exceeding the range of the charge voltage that the battery 20 can accommodate as a result of summing up the control value. The upper and lower limits of the limiter 357 may be determined by subtracting the initial output voltage command Vcmd from the battery allowable upper and lower voltage values in consideration of the predetermined battery performance. FIG. 3 shows an example in which the upper limit of the charging voltage that the battery 20 can accommodate is 13.8 V and the lower limit is 7.5 V. FIG.

The voltage drop compensator 117 is provided to give a constant margin to the upper limit value of the limiter 357 of the control value generator 115. [

As described above, the output voltage command Vref * is limited to a predetermined battery allowable maximum voltage (for example, 13.8 V) in order to prevent the battery 20 from being damaged. If the state of charge (SOC) of the battery 20 is high (for example, the open circuit voltage of the battery is 13.6 to 13.7 V in case of 95% or more) due to this restriction, the control value saturates to the upper limit value of the limiter 355 Current control is impossible.

However, since a voltage drop occurs due to the line resistance component between the output terminal of the converter 10 and the terminal of the battery 20, the output of the converter 10 is controlled to an output voltage command of 13.8 V, The voltage becomes lower than 13.8 V. That is, even if the output voltage command Vref * is larger than 13.8 V, a voltage reduced by the voltage drop amount of the line resistance component is applied to the terminal of the battery 20. In consideration of this point, in order to expand the current controllable region, the voltage drop amount at the upper limit value (13.8-Vcmd) of the limiter 357, that is, the battery terminal voltage actual value Vbat at the converter output voltage actual value Vo, Can be added. That is, the voltage drop compensation unit 117 gives a margin corresponding to the battery terminal voltage actual value (Vbat) at the converter output voltage actual value Vo to the upper limit value of the limiter 357 of the control value generator 115 .

To provide a stable margin, the voltage drop compensation section 117 may be configured to include a proportional value application section 371, a low-pass filter 373, and a limiter 375. [

The converter control system for charging a battery of a vehicle according to various embodiments of the present invention as described above can implement a method of controlling a converter for charging a battery of a vehicle by its operation.

The method for controlling a converter for charging a battery of a vehicle according to an embodiment of the present invention includes the steps of determining an actual output voltage command value detected at an output terminal of the converter 10 as an initial output voltage command at the start of the operation, Generating a charging current command based on a difference between a high efficiency point current preset for the converter (10) and a load current provided as an electric field load; and controlling the charging current command Generating an output voltage command of the converter 10 by reflecting the control value to the initial output voltage command.

4 to 6 show simulation results of an apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention. In particular, the charging current controller 110) is applied.

4, in the section for controlling the auxiliary battery charging current, the battery current instruction Ibat *, in which the battery current actual value Ibat detected at the terminal of the battery 20 is set to the high efficiency point current of the converter 10, Of the population.

Since the load current Iload deviates from the output current limit of the converter 10 in the LDC derating period of FIG. 4, the PI of the control value generator 115 is controlled so that the current control of the battery 20 is not performed. It can be seen that the input of the controller 355 is zeroed by the mux 353 and a load current request above the output current limit of the converter 10 is provided at the battery 20.

Further, in a section in which the load current Iload is higher than the high efficiency point current of the converter, that is, the current command Ibat * is limited to 0 by the limiter 330, it is determined that the battery current is appropriately controlled to be zero current Can be confirmed.

5, when the maximum efficiency current of the converter is 45 A and the load current is increased to 40 A in units of 10 A from 0 A, the battery charging current charging the battery 20 is the highest efficiency of the converter 10 It is confirmed that the current is controlled so as to be a value obtained by subtracting the load current from the current 45A.

6, when the load current varies from 20 A to 60 A, the load current is larger than the maximum efficiency current (45 A) of the converter 10, so that the battery charge current is controlled to be zero current can confirm.

As described above, the apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention can control the charge current output to the auxiliary battery for charging while controlling the converter output voltage command. The apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention actively control the charging current supplied from the converter to the battery, unlike the case where the charging current is decided passively after the output voltage is determined in the conventional constant voltage control It is adjustable in real time.

The apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention can control the charging current of the auxiliary battery so that when energy unnecessarily provided to the auxiliary battery is generated according to the vehicle operation conditions, Zero current control can be performed, and the optimal charging condition can be selected to provide a desired amount of charge current to the secondary battery. In other words, an apparatus and method for controlling a converter for charging a battery of a vehicle according to various embodiments of the present invention can appropriately adjust the voltage command of the converter to control the auxiliary battery charge current, thereby maximizing the energy efficiency of the auxiliary battery, Can be improved.

Accordingly, since the number of times the energy is charged / discharged by the auxiliary battery can be minimized, the service life of the auxiliary battery can be extended, thereby improving the merchantability and reducing the service cost that may arise in the future.

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit of the invention, And will be apparent to those skilled in the art.

10: Low-voltage DC-DC converter (LDC) 20: Secondary battery
30: main battery 100: converter control device
110: charge current control unit 111: initial command generation unit
113: current command generation unit 115: control value generation unit
117: Voltage drop compensator

Claims (13)

1. A battery charging converter control apparatus for a vehicle, which converts high-voltage power to output a low-voltage power used as a power source of a vehicle's electric field load and a charging power of the battery,
A current command generator for generating a charging current command based on a difference between a high efficiency point current preset for the converter and a load current provided to the electric load; And
And a control value generator for generating a control value for causing the battery current actual value detected at the terminal of the battery to follow the charge current command,
And the output voltage command of the converter is generated by reflecting the control value to a predetermined initial output voltage command. The method according to claim 1,
Wherein the current command generator determines a value obtained by subtracting the measured actual value of the battery current from a measured value of the converter output current detected at the output terminal of the converter as the load current. The method according to claim 1,
Wherein the current command generation unit limits the charge current command to 0 when the load current is larger than the high efficiency point current. The method according to claim 1,
Wherein the control value generator derives the control value by proportionally and integrally controlling the difference between the actual value of the battery current detected at the terminal of the battery and the charge current command. The method of claim 4,
Wherein the control value generator substitutes 0 for the difference between the actual value of the battery current detected at the terminal of the battery and the charge current command when the load current becomes a derating state in which the load current is larger than the rated capacity of the converter. Of the converter for charging the battery of the battery. The method according to claim 1,
Further comprising an initial command generator for determining an actual output value of the converter output voltage detected at an output terminal of the converter at the start of operation of the battery charging converter control device of the vehicle as the initial output voltage command Converter control device. The method of claim 6,
Wherein the control value generator limits the control value between a value obtained by subtracting the initial output voltage command from a predetermined battery allowable upper and lower limit voltage value. The method of claim 7,
And a voltage drop compensation unit which gives a margin corresponding to a difference between an actually measured value of the converter output voltage detected at the output terminal of the converter and an actual value of the battery voltage detected at the battery terminal, Further comprising: a converter for charging the battery of the vehicle. 1. A battery charging converter control apparatus for a vehicle, which converts high-voltage power to output a low-voltage power used as a power source of a vehicle's electric field load and a charging power of the battery,
An initial command generator for determining an actual output voltage command value of the converter output voltage detected at an output terminal of the converter as an initial output voltage command; A current command generator for generating a current command and a control value generator for generating a control value for causing the battery current actual value detected at the terminal of the battery to follow the charge current command, A charge current controller for generating a first output voltage command for the converter by reflecting the control value;
A constant voltage control unit for generating a second output voltage command for the converter derived using a predetermined voltage command map based on the state of the vehicle;
A signal selection unit for determining whether the charge current control unit and the constant voltage control unit operate or not and selecting one of the first output voltage instruction and the second output voltage instruction and outputting the selected one; And
A pulse width modulation integrated element for generating a pulse width modulated signal for controlling a switching element in the converter based on a difference between an output voltage command selected by the signal selector and an actual value of the output voltage;
And a control unit for controlling the charging of the battery of the vehicle. The method of claim 9,
Wherein the initial command generator determines the actual output voltage command value of the converter output voltage detected at the output terminal of the converter at the point of time when the operation of the constant voltage controller is stopped and the operation of the charge current controller is started. Of the converter for charging the battery of the battery. The method of claim 10,
Wherein the control value generator limits the control value between a value obtained by subtracting the initial output voltage command from a predetermined battery allowable upper and lower limit voltage value. The method of claim 11,
And a voltage drop compensation unit which gives a margin corresponding to a difference between an actually measured value of the converter output voltage detected at the output terminal of the converter and an actual value of the battery voltage detected at the battery terminal, Further comprising: a converter for charging the battery of the vehicle. A control method of a battery charging converter for a vehicle that converts high voltage power and outputs low voltage power used as a power source of a vehicle full load and a charging power of the battery,
Determining an actual output voltage command value of the converter detected at the output terminal of the converter at the time of starting the control method of the battery charging converter as an initial output voltage command;
Generating a charging current command based on a difference between a predetermined high efficiency point current for the converter and a load current provided by the electric field load;
Generating a control value for causing the measured actual value of the battery current detected at the terminal of the battery to follow the charging current command; And
Generating an output voltage command of the converter by reflecting the control value to the initial output voltage command;
Wherein the control method comprises the steps of:

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