KR101714148B1 - Wireless charger and method for eco friendly vehicle - Google Patents

Abstract

The present invention relates to an apparatus and a method for wirelessly charging an environmentally friendly vehicle, and more particularly, to an apparatus and method for wirelessly charging an environmentally friendly vehicle, comprising: a power receiver for receiving radio power from outside and for rectifying the radio power to a DC voltage; And a controller for controlling operation of the power converter to charge the battery according to a result of the check.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless charging device and method for an environmentally friendly vehicle,

The present invention relates to an apparatus and a method for wirelessly charging an environmentally friendly vehicle, and more particularly, to a method and apparatus for charging an environmentally friendly vehicle using a high voltage bi-directional DC / DC converter (HDC) And more particularly, to a wireless charging apparatus and method for an environmentally friendly vehicle that wirelessly charges a high voltage battery of an environmentally friendly vehicle.

Hyundai is developing eco-friendly system and researching energy to solve the serious problem of environmental pollution. Among these, environmentally friendly vehicles such as electric vehicles and hybrid vehicles are proposed as alternative to the environmental pollution problem.

With the advent of such eco-friendly vehicles, various charging technologies have been introduced to charge high-voltage batteries mounted inside eco-friendly vehicles. Particularly, various non-contact charging methods (wireless charging methods) which can solve the inconvenience of a wired charging method in which a plug is directly inserted and used are proposed.

BACKGROUND ART [0002] A conventional non-contact charging system is composed of a transmitting portion provided outside the vehicle and a receiving portion formed inside the vehicle.

The transmitter includes a PFC (Power Factor Correction) circuit for synchronizing the phase of the voltage / current with an input of system power, an inverter for generating an AC voltage for power transfer to the receiving side (Rx) And a primary coil for transferring the secondary coil to the secondary coil.

The receiving unit includes a secondary coil that absorbs power transmitted from the transmission side Tx, a rectification unit that converts the generated AC voltage into a DC power source, and a boosting / reducing converter that converts the generated AC voltage into a voltage required by the battery. The required voltage varies depending on the DC voltage generated from the rectifying part and the charged amount of the battery, and a boosting / reducing converter is used to convert the voltage generated from the rectifying part to a voltage required by the battery. Insulation is satisfied through the non-contact power transfer method between the grid power supply and the battery. Therefore, conventionally, the topology (power circuit) of the boost converter is adopted as a non boost type boost, a buck, a boost converter, a cook, a Sepic circuit scheme, and the like .

The conventional non-contact type charging device solves the inconvenience and safety problem of the wire charging method in which a plug is connected and charged. However, since the charging / discharging converter of a large capacity needs to be used for charging a high voltage battery, There is a problem that it increases.

KR 101071933 B1

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the prior art described above, and it is an object of the present invention to provide a high-voltage bidirectional converter for use in charge of a high-voltage battery of an environment- The present invention provides a wireless charging apparatus and method for an environmentally friendly vehicle that converts a voltage required for charging a battery using a high voltage bi-directional DC / DC converter (HDC).

According to an aspect of the present invention, there is provided a method of wirelessly charging an environmentally friendly vehicle, comprising: checking whether a controller is in a stopped state; Converting the direct current voltage output from the power receiver to a charging voltage required by the battery, converting the direct current voltage output from the power converter into a charging voltage required by the battery, And charging the battery.

Further, the power converter is implemented as a high-voltage bi-directional converter.

The wireless charging method further includes converting the output voltage output from the battery to the motor driving voltage by the power converter under the control of the controller when the vehicle is in operation.

According to another aspect of the present invention, there is provided a wireless charging device for an environmentally friendly vehicle, comprising: a power receiver that receives radio power from the outside and rectifies the radio power to a DC voltage; And a controller for controlling operation of the power converter to charge the battery according to a result of the check.

The power receiver may further include a receiver for receiving radio power from the outside and a rectifier for converting the radio power into a DC voltage.

Further, the power converter is implemented as a high-voltage bi-directional converter.

In addition, the power converter converts the regenerative power supplied from the motor into a charging voltage required by the battery and transmits the charging voltage to the battery.

The power converter converts the output voltage output from the battery into a motor drive voltage and outputs the motor drive voltage.

A high voltage bi-directional DC / DC converter (HDC) is used to charge a high voltage battery of an eco-friendly car by using an external power source. The high voltage bi- It is possible to convert the battery into a voltage required for charging and perform wireless charging of the battery.

In this way, since the conventional boost / decompression converter is eliminated and power conversion is performed using the HDC, the configuration of the wireless charging device can be simplified. In addition, the present invention enables the weight saving, high density, and large capacity charging of the wireless charging device.

1 is a block diagram of a wireless charging system for an environmentally friendly vehicle according to an embodiment of the present invention;
2 is a circuit diagram for explaining an input / output relationship of the power converter shown in FIG.
3 is a flowchart illustrating a wireless charging method of an environmentally friendly vehicle according to an embodiment of the present invention.

The terms "comprises", "comprising", "having", and the like are used herein to mean that a component can be implanted unless otherwise specifically stated, Quot; element ".

Also, the terms " part, "" module, " and" module ", as used herein, refer to a unit that processes at least one function or operation and may be implemented as hardware or software or a combination of hardware and software . It is also to be understood that the articles "a", "an", "an" and "the" Can be used.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a block diagram of a wireless charging system for an environmentally friendly vehicle according to an embodiment of the present invention.

Referring to FIG. 1, the wireless charging system of an environmentally friendly vehicle includes a wireless charging device 100 and a power supply 200.

The wireless charging device 100 is installed inside the environmentally friendly vehicle and receives wireless power from the power supply device 200 to charge the battery 130, which will be described later.

The wireless charging device 100 includes a power receiver 110, a power converter 120, a battery 130, an inverter 140, a motor 150, and a controller 160.

The power receiver 110 serves to receive wireless power supplied from the outside. The power receiver 110 includes a receiving unit 111 and a rectifying unit 113.

The receiving unit 111 is a secondary coil that absorbs radio power transmitted from the power supplying apparatus 200, and generates an AC voltage with the received radio power.

The rectifier 113 converts the AC voltage output from the receiving unit 111 into a DC voltage. The DC voltage rectified by the rectifying unit 113 is fixed to a voltage when the charged amount is the highest regardless of the state of charge (SOC) of the battery 130. [

The power converter 120 converts the DC voltage (rectified voltage) output from the rectifying unit 113 into a charging voltage required by the battery 130 when the vehicle is in a stationary state. The power converter 120 is implemented as a high voltage bi-directional DC / DC converter (HDC).

The power converter 120 converts the regenerative power generated by the motor 150 into a charging voltage required by the battery 130 during the vehicle operation and transmits the charging voltage to the battery 130. The power converter 120 boosts the voltage of the battery 130 and supplies it to the inverter 140.

The battery 130 supplies the drive power of the environmentally friendly vehicle. The battery 130 is implemented by a high voltage battery and is charged by the power supplied through the power converter 120.

The battery 130 includes a battery management system (BMS) that monitors a charged amount (remaining amount) and a battery state (overvoltage, overcurrent, overheat, etc.) in real time to prevent overcharge or overdischarge. The BMS (not shown) informs the power converter 120 of a voltage (voltage required for charging) that varies depending on the battery charge amount (remaining amount).

The inverter 140 converts the electric power output from the electric power converter 120 into a three-phase AC power required by the motor 150.

The motor 150 converts electric energy into drive energy to drive the vehicle.

The controller 160 confirms whether the vehicle is in a stopped state or in a running state through a sensor (e.g., a speed sensor) installed in the vehicle.

In addition, the controller 160 checks the remaining battery level (SOC) when the vehicle is in a stopped state to determine whether battery charging is necessary. The controller 160 controls the power receiver 110 and the power converter 120 to perform battery charging when battery charging is required.

On the other hand, if the vehicle is in operation, the controller 160 controls the power converter 120 according to the required power of the vehicle to perform the constant current or constant voltage control.

The power supply device 200 is installed outside the vehicle and supplies the wireless power required for charging the battery 130 mounted in the vehicle. The power supply 200 supplies 6.6 kW to 22 kW of power. The power supply device 200 includes a power supply unit 210, an calibration unit 220, an inverter 230, and a transmission unit 240.

The power supply unit 210 supplies the system power. The power supply unit 210 senses approach of the vehicle by using a sensor (not shown), and when the vehicle approaches within a certain distance, the system power supply is started.

The calibration unit 220 compensates the power factor by synchronizing the phases of the input voltage and the input current input from the power supply unit 210. That is, the calibration unit 220 improves the efficiency of power input through the power supply unit 210. This calibration unit 220 is implemented as a power factor correction (PFC) circuit.

The inverter 230 generates AC power (AC voltage) to transfer power to the wireless charging device 100.

The transmitting unit 240 is a primary coil that stores AC power output from the inverter 230 and transmits the AC power to the receiving unit 111 of the wireless charging device 100. In other words, when electric current flows through the primary coil, an electromagnetic field is formed around the primary coil. At this time, the secondary coil in the wireless charging device 100 of the vehicle converts the electromagnetic field and the resonant electromagnetic field into electric power (current) and uses it for charging the battery.

2 is a circuit diagram for explaining an input / output relationship of the power converter shown in FIG.

Switch A and switch B of the power converter 120 operate in a complementary manner. The high voltage generated in the rectifying part 113 is connected to the capacitor of the power converter 120. [

The current flowing in the inductor of the power converter 120 increases while the switch A of the power converter 120 is on, and energy is accumulated in the inductor. When the switch A of the power converter 120 is turned off and the switch B is turned on, the energy stored in the inductor is transmitted to the battery 130 via the switch B, and the current flowing in the inductor is reduced .

The charging voltage by the power converter 120 is controlled in accordance with the change of the inductor current when the switch A of the power converter 120 is turned on and off.

First, when the vehicle is stationary and the battery is being charged, the output voltage of the power converter 120 is determined by the inductor voltage Vrx and the duty ratio D of the switch A.

Where I is the inductor current, Vrx is the inductor voltage, VL is the battery voltage, L is the inductance, D is the time the switch A is on for one period, and T is the time.

Next, when the vehicle is in operation, the power converter 120 serves to charge the battery 130 using the regenerative power or to supply the electric power of the battery 130 to the motor 150.

When the power converter 120 charges the battery 130 using the regenerative power, the output of the power converter 120 is determined by the capacitor voltage of the power converter 120 and the duty ratio of the switch A as shown in Equation (2) The voltage (charge voltage) is determined.

Here, VH is the capacitor voltage of the power converter 120.

On the other hand, when the power converter 120 supplies the driving voltage of the motor 150, the output voltage VH of the power converter 120 can be expressed by Equation (3).

The power converter 120 controls the conversion ratio of the rectified voltage or the regenerative power output from the power receiver 110 through the duty control of the switches A and B.

3 is a flowchart illustrating a wireless charging method of an environmentally friendly vehicle according to an embodiment of the present invention.

As shown in FIG. 3, the controller 160 of the wireless charging device 100 confirms whether the vehicle is in a stop state (S101). For example, the controller 160 determines that the vehicle is in a stopped state when the vehicle speed is maintained at zero for a predetermined time through the speed sensor installed in the vehicle.

The controller 160 checks the battery charge amount (remaining amount) when the vehicle is in a stopped state (S103). The controller 160 confirms the battery charge amount through data communication with the battery management system (BMS) in the battery 130 via the vehicle network communication.

The controller 160 determines whether to charge the battery based on the charged amount of the battery (S105).

The controller 160 rectifies the input voltage input from the external power supply 200 through the power receiver 110 when battery charging is required (S107). In other words, the receiving unit 111 of the power receiver 110 generates the AC voltage by receiving the radio power, and the rectifying unit 113 converts the AC voltage output from the receiving unit 111 into the DC voltage.

In accordance with the control of the controller 160, the power converter 120 converts the rectified voltage into a charging voltage required by the battery 130 (S109).

The power converter 120 transfers the converted charging voltage to the battery 130 to charge the battery 130 (S111).

On the other hand, if the vehicle is in operation, the controller 160 controls the constant current and the constant voltage through the power converter 120 according to the required electric power of the vehicle (S113). The power converter 120 converts an output voltage output from the battery 130 into a driving voltage of the motor 150 and outputs the converted voltage. When the regenerative power is generated by the motor 150, the power converter 120 converts the regenerated power into a charging voltage required by the battery 130, and transfers the regenerated power to the battery 130.

As described above, in the present invention, a large amount of electric power (voltage) transmitted from the rectifying unit 113 is supplied to the battery 130 through the HDC 120, which is implemented in a high capacity for driving the motor and regenerative energy, Conversion converter to remove the boost / depressurization converter of the conventional power receiving side, thereby simplifying the configuration of the in-vehicle charging device.

In addition, although the above-described embodiment uses a wireless power transmission technique of an electromagnetic inductive coupling method as an example, the present invention is not limited thereto, but may be applied to an electromagnetic radiation, a resonant magnetic coupling, , And an electromagnetic wave transmission method (Microwave) may be applied.

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, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

100: Wireless charging device
110: power receiver
111: Receiver
113: rectification part
120: power converter
130: Battery
140: Inverter
150: motor
160:

Claims (8)

Checking whether the controller is in a stopped state,
When the vehicle is in a stopped state, the power receiver receives radio power from the outside and rectifies it to a DC voltage under the control of the controller;
Converting the rectified DC voltage output from the power receiver to a charging voltage required by the battery,
And charging the battery with the voltage converted by the power converter,
The power converter converts the regenerative power supplied from the motor into a charging voltage required by the battery and transmits the charging voltage to the battery,
The power converter includes a first switch and a second switch that operate complementarily and controls the conversion ratio of the rectified DC voltage or the regenerative power through the duty control of the first switch and the second switch A method of wireless charging of an environmentally friendly vehicle.
The method according to claim 1,
The power converter includes:
Voltage bidirectional converter. ≪ Desc / Clms Page number 15 >
The method according to claim 1,
Further comprising converting the output voltage output from the battery to a motor drive voltage and outputting the motor drive voltage according to control of the controller when the vehicle is in operation.
A power receiver for receiving radio power from the outside and rectifying the radio power to a DC voltage;
A power converter for converting the rectified DC voltage output from the power receiver into a charging voltage;
And a controller for checking operation of the power converter to charge the battery according to a result of the check,
The power converter converts the regenerative power supplied from the motor into a charging voltage required by the battery and transmits the charging voltage to the battery,
The power converter includes a first switch and a second switch that operate complementarily and controls the conversion ratio of the rectified DC voltage or the regenerative power through the duty control of the first switch and the second switch A wireless charging device for an environmentally friendly vehicle.
5. The method of claim 4,
The power receiver includes:
A receiving unit for receiving wireless power from outside;
And a rectifier for converting the radio power into a DC voltage.
5. The method of claim 4,
The power converter includes:
Voltage bidirectional converter. ≪ IMAGE >
delete 5. The method of claim 4,
The power converter includes:
And converts the output voltage output from the battery to a motor drive voltage and outputs the motor drive voltage.

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