KR20120125886A - integrated module of inverter and charger circuit - Google Patents

Abstract

PURPOSE: An inverter and a charging circuit integration device are provide to integrate an inverter circuit and a battery charging circuit, thereby reducing the number of circuit components of a power conversion device. CONSTITUTION: A switch(60) supplies DC power supplied from a first circuit unit(50) to a motor. The switch supplies AC power supplied from system power to the first circuit. The first circuit unit supplies a voltage supplied from a second circuit unit(40) to the switch by converting the voltage into a space vector voltage. The first circuit unit supplies the AC power to the second circuit unit by commutating the AC power supplied from the switch. The second circuit unit supplies a battery voltage to the first circuit unit by lifting the battery voltage supplied a battery. [Reference numerals] (AA) Charge; (BB) Motor driving

Description

Integrated module of inverter and charger circuit

The present invention relates to a power conversion device incorporating an inverter and a charging circuit.

The development of eco-friendly alternative energy vehicles has been actively carried out at home and abroad due to the problem of environmental degradation such as limited oil resource depletion forecast, rapid rise of oil resources, pollution and global warming caused by harmful exhaust gas, We are at a stage of expansion. Such alternative energy vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs) that combine fossil fuels and electric energy, and fuel cell electric vehicles (FCEVs).

In consideration of commercialization of the alternative energy vehicle, a power converter unit (PCU) used in the electric vehicle or the like is required to be light, small, and have high efficiency.

According to the prior art, the power converter has a separate configuration of a charging circuit and an inverter, and in particular, the charging circuit is classified into a fast charger and a slow charger, which are converted into DC power through a separate device external to the fast charger. After the power is supplied, the slow charger is configured to be directly supplied with a single-phase system AC power, and the configuration is complicated, there was a problem in terms of price and volume.

An object of the present invention is to propose an inverter and a charging circuit integrating apparatus incorporating an inverter circuit for driving a motor and a charging circuit for battery charging.

Another object of the present invention is to propose an electric vehicle including the inverter and the charging circuit integrator.

In order to solve the above problems, an inverter and a charging circuit integrating apparatus according to an embodiment of the present invention may supply DC power supplied by a first circuit unit to a motor, or AC power supplied by a system power supply to the first circuit unit. Switch; A first circuit unit converting the voltage supplied by the second circuit unit into a space vector voltage for driving the motor and supplying the voltage to the switch or rectifying AC power supplied by the switch to the second circuit unit; And a second circuit unit which boosts the battery voltage supplied by the battery and supplies the voltage to the first circuit unit, or reduces the rectified voltage supplied by the first circuit unit and supplies the reduced voltage to the battery.

Here, the system power is a three-phase power, the three-phase power is directly input to the switch, it is possible to rapidly charge the battery using the input three-phase power.

The first circuit unit may include a switching element including an arm switch and a freewheeling diode connected in parallel to the arm switch; And a first to third arms including two switching elements connected in series, wherein the battery voltage is converted into the space vector voltage according to the opening and closing operation of the switching element, AC power supply can be rectified.

Here, the inverter and the charging circuit integrator may further include a control unit for controlling the opening and closing operation of the switching element according to a pulse width modulation (PWM).

The female switch may be a thyristor or an insulated gate bipolar transistor (IGBT).

Here, the inverter and the charging circuit integration device may further include a smoothing capacitor connected in parallel between the first circuit portion and the second circuit portion.

The switch may be a relay or a magnetic contactor (MC).

An electric vehicle according to another embodiment of the present invention for solving the above problems is a motor for driving a wheel by rotating a rotating shaft; A battery storing power supplied to the motor; And an inverter and a charging circuit integrator for driving the motor by receiving electric power from a system power source to charge the battery or transferring power charged in the battery to the motor. And a switch configured to supply DC power supplied by a first circuit unit to the motor or AC power supplied by the system power to the first circuit unit. The first circuit unit converting the voltage supplied by the second circuit unit into a space vector voltage for driving the motor and supplying the voltage to the switch, or rectifying AC power supplied by the switch to supply the second circuit unit; And a second circuit unit for boosting a battery voltage supplied by the battery to supply the first circuit unit or reducing the rectified voltage supplied by the first circuit unit to supply the reduced voltage to the battery.

Here, the system power source may be a three-phase power source, the three-phase power source may be directly input to the switch, and may include an inverter and a charging circuit integrated device for rapidly charging the battery using the input three-phase power source.

According to the inverter and the charging circuit integrating apparatus of the present invention, since the inverter circuit and the battery charging circuit can be integrated into one, it is possible to reduce the number of circuit components of the power converter and simplify the configuration. Therefore, the total volume and weight of the power conversion device can be reduced, and the number of elements can be reduced to contribute to lowering the price. In addition, a simple circuit configuration can reduce the loss of power conversion.

According to the inverter and the charging circuit integrated device of the present invention, both fast and slow charging is possible with a single charging port, and the external power of the three-phase system can be used as it is without a process of converting the DC current by an external device during rapid charging. have.

Since the inverter and the charging circuit integrating apparatus of the present invention use a step-down DC-DC converter, the burden on the battery series connection can be reduced, and the high speed rotation of the motor is also advantageous.

1 is a circuit diagram showing the configuration of an inverter for driving a motor.
2 is a circuit diagram showing the configuration of single-phase and three-phase chargers.
3 is a circuit diagram showing an inverter and a charging circuit integrating apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a circuit diagram showing the configuration of an inverter for driving a motor.

Referring to FIG. 1, the inverter may include a motor driving unit 150 and a DC-DC inverter 140.

The motor driver 150 may include first to third arms configured by connecting two switching elements in series, and the switching elements are connected in parallel to an arm switch and the arm switch. It may include a freewheeling diode. Each arm switch may be implemented using a semiconductor switch such as a thyristor or an insulated-gate bipolar transistor (IGBT). By adjusting the gate voltage of each arm switch, the phase between the input voltage and the current of the motor driver 150 may be adjusted and the magnitude of the output voltage may be changed.

The DC-DC converter 140 may be configured with one arm, and adjusts the gate voltage of each arm switch to step up the battery from the battery voltage supplied by the battery 10 to a preset magnification, so that the motor driver 150 Can be provided to

When the DC-DC converter 140 boosts the battery voltage supplied by the battery 10 to provide the motor driver 150, the inverter pulses the battery voltage using the motor driver 150. Pulse width modulation (PWM) may be used to convert the space vector voltage required to rotate the motor 20. Specifically, the motor driving unit 150 is a three-phase alternating voltage (three-phase voltage) having a 120-degree phase difference between the DC voltage supplied by the DC-DC converter 140 to operate the motor 20 Can perform the function of converting.

2 is a circuit diagram showing the configuration of single-phase and three-phase chargers.

Referring to FIG. 2, the charger circuit may include power factor correction units 251 and 252 and DC-DC converters 241 and 242.

The charger circuit may receive an AC commercial power from the system power sources 31 and 32 and convert it into a DC charging voltage capable of charging the battery 10. Thus, the charger circuit can be viewed as an AC-DC converter circuit.

The power factor correctors 251 and 252 are used to correct power factor regulation and perform a function of correcting a power factor of a voltage input to the power factor correctors 251 and 252, and outputs a level higher than an input voltage through boost conversion. Voltage can be provided. Therefore, the voltages output from the power factor correctors 251 and 252 may appear higher than the maximum value of the voltages provided by the system power supplies 31 and 32.

The single-phase power factor correction unit 251 is composed of two arms, but the three-phase power factor correction unit 252 is composed of three arms. The power factor correction units 251 and 252 may adjust the gate voltage of each arm switch to adjust the phase between the input voltage and the current to the power factor correction units 251 and 252 and change the magnitude of the output voltage.

The DC-DC converters 241 and 242 may be constituted by one arm, and the voltage supplied by the power factor correcting units 251 and 252 is stepped down at a predetermined magnification by adjusting the gate voltage of each arm switch. The charging voltage can be applied to the

When the rated voltage of the battery 10 is lower than the maximum value of the voltage supplied by the grid power supplies 31 and 32, when the voltage of the power factor correcting units 251 and 252 is applied to the battery 10 as it is, the battery 10 It can shock you. Therefore, by using the DC-DC converters 241 and 242, the voltage applied to the battery 10 may be stepped down to prevent an impact on the battery 10.

3 is a circuit diagram illustrating an inverter and a charging circuit integrating apparatus according to an embodiment of the present invention.

Referring to FIG. 3, an inverter and a charging circuit integrating apparatus according to an embodiment of the present invention may include a first circuit unit 50, a second circuit unit 40, and a switch 60, and include a smoothing capacitor ( 70) may be further included.

The switch 60 may supply DC power supplied by the first circuit unit 50 to the motor 20, or supply AC power supplied by the system power supply 30 to the first circuit unit 50.

The switch 60 may determine whether the inverter and the charging circuit integrator operate as an inverter or as a charger.

That is, when the first circuit unit 50 is connected to the motor 20 by the switch, the inverter and the charging circuit integrating device operate as an inverter, so that the motor 20 is operated with the power stored in the battery 10. I can drive it. On the contrary, when the first circuit unit 50 and the system power supply 30 are connected to each other by the switch, the inverter and the charging circuit integrating device operate as a charger, and thus, the battery may be powered by the system power supply 30. 10) can be charged.

The switch may be implemented using a relay or a magnetic contactor (MC).

The first circuit unit 50 converts the voltage supplied by the second circuit unit 40 into a space vector voltage for driving the motor 20 and supplies the converted voltage to the switch or AC power supplied by the switch 60. It can be rectified and supplied to the second circuit unit 40.

The first circuit unit 50 includes a switch element including a female switch and a freewheeling diode connected in parallel to the arm switch, and first to third arms including two switching elements connected in series. The battery voltage may be converted into the space vector voltage or the AC power supplied by the system power may be rectified according to the opening and closing operation of the device.

The female switch may be a thyristor or an insulated gate bipolar transistor.

In the case where the inverter and the charging circuit integrator operates as an inverter, the first circuit unit 50 operates in the same manner as the motor driving unit 150, and when the inverter and the charging circuit integrator operates as a charger. In this case, the first circuit unit 50 operates in the same manner as the power factor correction units 251 and 252.

The second circuit unit 40 boosts the battery voltage supplied by the battery 10 to supply it to the first circuit unit 50, or reduces the rectified voltage supplied by the first circuit unit 50 to reduce the voltage of the battery ( 10) can be supplied.

The second circuit unit 40 may include a switch element including a female switch and a freewheeling diode connected in parallel to the arm switch, and one arm including the two switching elements connected in series. The ratio of the output voltage to the input voltage can be adjusted by adjusting the gate voltage.

In the case where the inverter and the charging circuit integrator operate as an inverter, the second circuit unit 40 operates in the same manner as the DC-DC converter 140 of the inverter, and the inverter and the charging circuit integrator are chargers. In this case, the second circuit unit 40 operates in the same manner as the DC-DC converters 241 and 242 of the charger.

Since the second circuit unit 40 has a function of boosting a battery voltage when operating as an inverter, a relatively high voltage may be applied to the motor 20. Therefore, it may be advantageous in high speed rotation of the motor 20. In addition, since the second circuit unit 40 has a function of reducing a rectified voltage input when the battery is operated as a charger and supplying the battery to the battery, the burden of excessive high voltage generation even when the battery 10 is connected in series is reduced. Can be.

Although not shown, the inverter and the integrated charging circuit device may further include a control unit for controlling the opening and closing operation of the switching element according to the pulse width modulation method. The first circuit unit 50 may convert the voltage supplied from the second circuit unit 40 into a space vector voltage for driving the motor 20 and supply the converted voltage to the switch 60. The conversion may be implemented by the opening and closing operation of the switching element. Specifically, opening and closing of the switching element may be controlled by controlling the gate voltage of the female switch constituting the switching element.

In particular, when the controller controls the opening and closing operation of the switching element by a pulse width modulation method, the first circuit unit 50 operates the motor 20 to operate the DC voltage supplied from the second circuit unit 40. For this purpose, it can convert three AC voltages 120 degrees out of phase with each other.

In addition, the controller controls the switching elements of the first circuit unit 50 and the second circuit unit 40 so that the inverter and the charging circuit integrator may operate as an inverter or a charger according to the operation of the switch 60. Can be controlled.

When the inverter and the charging circuit integrated device operate as an inverter, the first circuit unit 50 performs the space vector voltage conversion, and the second circuit unit 40 boosts the battery voltage supplied by the battery 10. The gate of the arm switch may be controlled to perform a function of causing the arm switch. On the contrary, when the switch 60 operates the inverter and the charging circuit integrator as a charger, the first circuit unit 50 performs the function of rectifying the AC power supplied by the system power supply 30. The gate voltage of the female switch of the device may be controlled, and the second circuit part 40 may control the switching device to step down the rectified voltage supplied by the first circuit part 50 to provide it to the battery 10. have.

The system power supply 30 may be a single phase power supply or a three phase power supply. As shown in FIG. 3, when all three wires are connected to the three-phase system power supply 30 by the switch 60, the three-phase charger may operate as the three-phase charger as shown in FIG. On the other hand, in FIG. 3, when only two arbitrary wires are connected to the single-phase system power supply 30 by the switch 60, the switch 60 may operate as a single-phase charger as shown in FIG. Therefore, the present invention can configure a charger regardless of whether the system power supply 30 is single-phase or three-phase.

Using the technical features of the present invention described above, slow or rapid charging is possible by using an external power source of a three-phase system or a single-phase system as one charging port without a separate external device.

In the case of slow charging, since power is generally supplied from an AC power supply of a single phase system, as described above, only two arbitrary wires are connected to the single phase system power supply 30 by the switch 60. can do.

In the case of rapid charging, the AC power of the three-phase system is converted into a DC power source by a separate device, and then, the power is charged from the DC power source. However, when the inverter and the charging circuit integrated device of the present invention receives an AC power of a three-phase system, the power factor correction unit 252 rectifies the AC power and converts the AC power into a DC power to charge the battery 10. Fast charging is possible from the external power supply of the three-phase system without a separate device.

That is, by connecting the AC power of the three-phase system to the inverter and the charging circuit integrated device of the present invention it is possible to perform a quick charge on the battery (10). In addition, when the inverter and the charging circuit integrated device of the present invention is applied to an electric vehicle, it is possible to quickly charge the electric vehicle immediately without having to convert a three-phase power source into a direct current through an external fast charger.

Therefore, the inverter and the charging circuit integrator of the present invention can be charged regardless of the external power of the single-phase system for slow charging or the external power of the three-phase system for rapid charging, and the charging or fast charging is possible with one charging port. Do.

The smoothing capacitor 70 may be connected in parallel between the first circuit part 50 and the second circuit part 40. The smoothing capacitor 70 may play a role of converting the AC power rectified by the first circuit part 50 closer to the DC power when the inductor and the charging circuit integrating device operate as a charging circuit.

By using the inverter and charging circuit integrator shown in FIG. 3 instead of using the separate inverter and charger circuits shown in FIGS. 1 and 2, the number of circuit components can be reduced and the configuration can be simplified. . Therefore, it is possible to reduce the volume and weight of the entire power conversion device, and to reduce the power loss during power conversion with a simple circuit configuration.

The present invention is not limited by the above-described embodiment and the accompanying drawings. 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 invention as defined by the appended claims, .

10: battery 20: motor
30: grid power 31: single phase grid
32: three-phase system power supply 40: second circuit
50: first circuit portion 60: switch
70: smoothing capacitor 140: DC-DC converter
150: motor drive unit 241, 242: DC-DC converter
251, 252: power factor correction unit

Claims (9)

A switch for supplying DC power supplied from a first circuit unit to a motor or supplying AC power supplied from a system power supply to the first circuit unit;
The first circuit unit converting the voltage supplied by the second circuit unit into a space vector voltage for driving the motor and supplying the voltage to the switch, or rectifying AC power supplied by the switch to supply the second circuit unit; And
And a second circuit unit for boosting a battery voltage supplied by a battery to supply the first circuit unit or reducing the rectified voltage supplied by the first circuit unit to supply the reduced voltage to the battery.
The method of claim 1,
The system power source is a three-phase power source, the three-phase power source is directly input to the switch, the inverter and charging circuit integrated device for rapidly charging the battery using the input three-phase power source.
The method of claim 1, wherein the first circuit portion,
A switching element including an arm switch and a freewheeling diode connected in parallel to the arm switch; And
As comprising a first to third arm including the two switching elements connected in series,
Inverter and charging circuit integrated device for converting the battery voltage into the space vector voltage or rectifying the AC power supplied by the system power according to the switching operation of the switching element
The method of claim 3,
Inverter and charging circuit integration device further comprising a control unit for controlling the opening and closing operation of the switching element in accordance with a pulse width modulation (PWM).
The method of claim 3,
And the female switch is a thyristor or an insulated gate bipolar transistor (IGBT).
The method of claim 1,
And a smoothing capacitor connected in parallel between the first circuit portion and the second circuit portion.
The method of claim 1, wherein the switch,
Inverter and charging circuit integrated device that is a relay or magnetic contactor (MC)
A motor for driving wheels by rotating a rotating shaft;
A battery storing power supplied to the motor; And
Including an inverter and a charging circuit integrated device for driving the motor by receiving power from a system power to charge the battery, or transfer the power charged in the battery to the motor,
The inverter and the charging circuit integration device,
A switch configured to supply DC power supplied by a first circuit unit to the motor or AC power supplied by the system power to the first circuit unit;
The first circuit unit converting the voltage supplied by the second circuit unit into a space vector voltage for driving the motor and supplying the voltage to the switch, or rectifying AC power supplied by the switch to supply the second circuit unit; And
And a second circuit unit for boosting a battery voltage supplied by the battery to supply the first circuit unit or reducing the rectified voltage supplied by the first circuit unit to supply the reduced voltage to the battery.
The method of claim 1, wherein
The system power source is a three-phase power source, the three-phase power source is directly input to the switch, the electric vehicle comprising an inverter and a charging circuit integrated device for rapidly charging the battery using the input three-phase power source.

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