CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0124431, filed on Oct. 8, 2019, the entire contents of which are incorporated herein by reference.

FIELD

Embodiments and implementations of the present disclosure relate to a vehicle, and more particularly, to a battery charger for electric vehicle that runs using only the power of a motor.

BACKGROUND

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Unlike internal combustion engine cars that use fossil fuels as their primary energy source, electric vehicles use electric energy as their primary energy source. Therefore, an electric vehicle requires a high voltage battery capable of storing electrical energy, a motor as a power source, and an inverter for driving the motor.

Chargers for charging batteries in electric vehicles can be divided into slow chargers and quick chargers. The slow charger delivers the commercial AC power to the car as it is, while the quick charger converts the commercial AC power to DC and delivers it to the car. The slow charger is advantageous in increasing the penetration rate because of its simple structure and low price. However, in order to use a slow charger, an onboard charger (OBC) must be installed in an electric vehicle.

The AC power provided by a slow charger varies greatly depending on the country where the slow charger is installed. In order to charge the battery of an electric vehicle using such various types of AC power, the vehicle-mounted charger should be able to cope with various types of commercial AC power. In addition, it should be able to cope with the AC power of the slow charger as well as the DC power supplied through the metal charger.

SUMMARY

In view of the above, it is an aspect of the present disclosure to provide a battery charger for electric vehicle having a simple structure, small size, and capable of charging a battery with power supplied from various types of power sources.

In one form of the present disclosure, a battery charger for electric vehicle includes a motor configured to generate power for driving the electric vehicle, an inverter configured to provide the power to the motor, an AC power input terminal configured to be input at least one AC power of single phase AC power and polyphaser AC power from a slow charger, a power factor corrector configured to include a plurality of full bridge circuits through which the AC power is input through the AC power input terminal, a link capacitor configured to connect in parallel with the power factor corrector, a switch network configured to include a first switch provided to connect any one of a plurality of AC power input lines and a neutral line constituting the AC power input terminal with the power factor corrector, a second switch provided to transfer one of a direct current power input from a quick charger and an alternating current power input from a slow charger to a high voltage battery, and a controller configured to control the power factor corrector and the switch network according to the conditions of the AC power and the DC power.

In some implementations, the plurality of full bridge circuits includes a first full bridge circuit and a second full bridge circuit.

In some implementations, a first leg of the first full bridge circuit is connected to a first AC power input line of the AC power input terminal, and a second leg of the first full bridge circuit is selectively connected to any one of the neutral line and the second AC power input line of the AC power input terminal through the first switch.

In some implementations, the second switch includes a third switch connected between the first leg of the first full bridge circuit and a first leg of the second full bridge circuit, a fourth switch connected between the second leg of the first full bridge circuit and a second leg of the second full bridge circuit, and a fifth switch connected a node to which the first leg of the second full bridge circuit and the third switch are connected to a third input terminal of the AC power input terminal.

In some implementations, the second switch further includes a sixth switch having one end connected to a positive electrode of the link capacitor, a seventh switch having one end connected to a negative electrode of the link capacitor, an eighth switch connected between the other end of the sixth switch and one side of the inverter, and wherein the battery charger is connected to the negative electrode of the link capacitor and the other side of the inverter through the seventh switch.

In some implementations, the second switch further includes a ninth switch connecting a node to which the first leg of the second full bridge circuit and the third switch are connected to the other end of the sixth switch, and a tenth switch connecting the node connected to the second leg of the second full bridge circuit and the fourth switch to the other end of the sixth switch.

In some implementations, the second switch further includes an eleventh switch provided between one side of the inverter and the positive electrode of the high voltage battery.

In some implementations, the second switch further includes a twelfth switch provided to connect between the positive electrode of the quick charger and the positive electrode of the high voltage battery, and a thirteenth switch provided to connect between the negative electrode of the quick charger and the negative electrode of the high voltage battery.

In some implementations, the second switch further includes a fourteenth switch connects the other end of the sixth switch and the other end of the seventh switch, the positive electrode of the high voltage battery, and the positive electrode of the quick charger to the neutral point of the motor.

In some implementations, the condition of the input AC power includes the conditions of polyphaser and single phase of the input AC power.

In some implementations, the condition of the input AC power includes a symmetrical and asymmetrical power supply condition of the input AC power.

In another form of the present disclosure, a battery for electric vehicle includes a motor configured to generate power for driving the electric vehicle; an inverter configured to provide the power to the motor, an AC power input terminal configured to be input at least one AC power of single phase AC power and polyphaser AC power from a slow charger, a power factor corrector configured to include a plurality of full bridge circuits through which the AC power is input through the AC power input terminal, a link capacitor configured to connect in parallel with the power factor corrector, a switch network configured to include a first switch provided to connect any one of a plurality of AC power input lines and a neutral line constituting the AC power input terminal with the power factor corrector, and a second switch provided to transfer one of a direct current power input from a quick charger and an alternating current power input from a slow charger to a high voltage battery, and a controller configured to control the power factor corrector and the switch network according to the conditions of the AC power and the DC power. The second switch includes an eighth switch connected between one side of each of the plurality of full bridge circuits and one side of the inverter, an eleventh switch provided between one side of the inverter and the positive electrode of the high voltage battery, a twelfth switch provided to connect between the positive electrode of the quick charger and the positive electrode of the high voltage battery, a thirteenth switch provided to connect between the negative electrode of the quick charger and the negative electrode of the high voltage battery, and a fourteenth switch provided to connect the positive electrode of the high voltage battery and the positive electrode of the quick charger to the neutral point of the motor.

In some implementations, the plurality of full bridge circuits includes a first full bridge circuit and a second full bridge circuit.

In some implementations, a first leg of the first full bridge circuit is connected to a first AC power input line of the AC power input terminal, and a second leg of the first full bridge circuit is selectively connected to any one of the neutral line and the second AC power input line of the AC power input terminal through the first switch.

In some implementations, the second switch includes a third switch connected between the first leg of the first full bridge circuit and a first leg of the second full bridge circuit, a fourth switch connected between the second leg of the first full bridge circuit and a second leg of the second full bridge circuit, and a fifth switch connected a node to which the first leg of the second full bridge circuit and the third switch are connected to a third input terminal of the AC power input terminal.

In some implementations, the second switch further includes a sixth switch having one end connected to a positive electrode of the link capacitor, and a seventh switch having one end connected to a negative electrode of the link capacitor, wherein the battery charger is connected to the negative electrode of the link capacitor and the other side of the inverter through the seventh switch.

In some implementations, the second switch further includes a tenth switch connecting the node connected to the second leg of the second full bridge circuit and the fourth switch to the other end of the sixth switch.

In some implementations, the condition of the input AC power includes the conditions of polyphaser and single phase of the input AC power.

In some implementations, the condition of the input AC power includes a symmetrical and asymmetrical power supply condition of the input AC power.

Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

