KR20160140292A - Electric operator about integrated inverter and charger using motor windings - Google Patents

Abstract

The present technology discloses an electric driving device embedded with a charger using a motor winding. The electric driving device includes a battery, a rectification unit, an inverter unit, and a motor. According to a specific example of the present invention, the electric driving device embedded with the charger using the motor winding is able to be light, thin, short and small because the inverter unit for driving the motor and a battery charger are integrated. In addition, manufacturing costs are reduced and a circuit integration degree is maximized because an existing expensive converter separately provided for charging the battery is removed according to an inductance function of a coil of the motor which is not driven in a charging mode. Moreover, when the inverter unit for driving the motor and the battery charger are integrated, modification of the motor for exposing a neutral line of the motor is unnecessary even if the neutral line of the motor is used, and the battery is stably charged without additional configuration of an inductor for increasing inductance required for current smoothing.

Description

ELECTRIC OPERATOR ABOUT INTEGRATED INVERTER AND CHARGER USING MOTOR WINDINGS BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a charger built-in electric drive apparatus using a motor winding, and more particularly, to an electric drive apparatus with a built-in charger, in which the output of the rectifier section is switched via at least one coil of the switching element of the inverter, The present invention relates to a device which can be applied by a battery.

In an electric drive system, an inverter refers to a device that drives a motor of a motor by converting DC power into AC power. In general, three-phase inverters are widely used and DC power is input from the battery. In this case, the charger for charging the battery must convert the AC power received from the external power source to DC power and charge the battery stably. Generally, a buck converter can be used for charging the battery.

A buck converter is commonly used for circuits where the input and output share the same ground. The buck converter uses a switching device that switches at regular intervals to allow the input power to be connected to the circuit while the switch is on and the input power to be cut off while the switch is off. In this way, the buck converter periodically interrupts the electrical flow, smoothes the pulse-like voltage through a low-pass filter, and outputs a DC voltage. This can be understood as a principle in which the output voltage is formed by averaging the pulse voltage generated by chopping the DC voltage periodically. Such a converter is called a voltage source converter or a step-down converter, and the output voltage is always smaller than the input voltage.

The conventional electric drive apparatus is provided with the inverter and the charger separately from each other, so that it takes much time and manpower to design the inverter and the charger to be mounted on the electric vehicle. In order to solve the above problems, researches for integrating an inverter and a charger have recently been attempted, and Korean Patent No. 10-1273736 discloses a related art related thereto.

According to Korean Patent No. 10-1273736, a high voltage battery is used to drive the motor itself at a high voltage, and a separate low voltage converter (LDC converter) 120 is used to drop the high voltage. In this case, there is a problem that the manufacturing cost is expensive, and there is a disadvantage that the low voltage battery used in the small personal moving means can not be used.

In addition, the prior art uses a separate switching element to implement the function of a buck converter that converts AC power to DC power for charging the battery. In more detail, according to the related art, a separate switching element is provided in the rectifying part 110 (see FIG. 1) in order to perform the buck converter function. If a separate switching device is to be provided, the switching device must have a large power capacity in order to perform the function of the buck converter, so that the manufacturing cost of the electric driving device becomes high.

The prior art is equipped to control the voltage / current of the high voltage battery by utilizing the switching element of the inverter connected to the motor neutral wire. In this case, since the neutral line of the motor is provided inside the motor, it is inevitable that the structure of the motor for exposing the neutral line to the outside is inevitably changed, and the conventional technique can not be applied when the motor is a delta connection.

Another conventional technique is to separately provide an inductor by utilizing a neutral line of the motor in order to increase the capacity of the inductor for smoothing the current during charging. However, in this case, when a current of the same phase flows through the three- There is a problem that the inductance due to the additional inductor is rather reduced.

Therefore, according to the present invention, since the output of the rectifying unit is applied to the battery via the switching element of the inverter and the at least one coil and coil of the motor during the charging mode, the structure of the motor and the method of stably charging without additional inductor .

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a rectifier circuit, in which the output of a battery is applied to a coil of an electric motor via an inverter, And the output of the rectifying section is applied to the battery via the switching element of the inverter and at least one of the coils and coils of the motor in the charging mode to provide a charger built-in electric driving apparatus using the motor winding, It is possible to stably charge the battery without changing the structure of the motor and additional inductors in an electric driving device in which an inverter for driving and a battery charger are integrated.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein,

battery; A rectifying unit for rectifying AC power supplied from the outside; An inverter unit having a plurality of switching elements and a diode for a freewheel reel and converting DC power supplied from the battery into AC power; An electric motor having a coil for generating magnetic flux and rotating by AC power supplied from the inverter; And the output of the battery is applied to the motor via the inverter in the drive mode, and the output of the rectifier is applied to the inverter in the charge mode.

Preferably, the inverter unit may be provided such that the output of the battery is applied to the motor coil via the inverter unit in the motor drive mode, and the output of the rectifier unit in the boost mode at the time of stopping the operation of the motor is connected to at least one coil To the rectifying part via a point.

Preferably, the inverter unit may include a top switching device connected to the anode of the battery via the switching unit, and a bottom switching device connected to the cathode of the battery. The bottom switching device may be configured to be off in a charging mode And the inverter unit may be provided such that the output of the rectifying unit in the charging mode is applied to the battery via the upper switching element and at least one coil and coil of the at least one coil of the motor.

Preferably, the inverter unit is provided such that the output of the rectifying unit is applied to the rectifying unit via the upper and lower switching elements of at least one of the coils and the coils of the upper switching element and the motor in the boost mode after the completion of battery charging, So that the output of the connected capacitor is applied to the battery.

Preferably, the switching unit is a charging switch that is switched in a driving mode and is switched to apply an output of the rectifying unit to the inverter unit in a charging mode; And the output of the rectifying part, which has passed through the charging switch in the charging mode, is switched to be applied to the battery via at least one coil of the upper switching element and the motor, and the uppermost point of the coil in the driving mode. And may be provided with a main switch to be switched.

Preferably, the electric driving apparatus further includes a control module for controlling the switching unit and the inverter unit, and the control module controls the switching time of the inverter unit so that the phase of the AC power inputted to the upper switching device is differently inputted by 120 degrees .

According to the present invention, since the inverter unit for driving the electric motor and the battery charger are integrally provided, it is possible to reduce the size of the charger built-in electric drive apparatus using the electric motor winding.

According to the present invention, since the existing expensive converter separately provided for charging the battery is removed according to the inductance function of the coil of the motor which is not driven in the charging mode, the manufacturing cost can be reduced and the circuit integration can be maximized.

According to the present invention, in integrating an inverter unit for driving an electric motor and a battery charger, there is no need to retrofit an existing motor for neutral line exposure and stable charging of the battery can be achieved without additional configuration of an inductor for increasing inductance required for current smoothing. This achieves a possible effect.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further understand the technical idea of the invention. And should not be construed as limiting.
Figure 1 shows a prior art inverter-charger integrated device.
2 is a diagram showing the configuration of a charger built-in electric drive apparatus according to an embodiment of the present invention.
3 is a diagram showing the configuration of an inverter unit of an electric driving apparatus according to an embodiment of the present invention.
4 is a view showing a current flow in a driving mode of an electric driving apparatus according to an embodiment of the present invention.
FIG. 5 is a graph showing the current flow when the electric motor of the electric drive apparatus stops operating according to the embodiment of the present invention. FIG.
6 is a view showing a current flow in a boost mode of an electric driving apparatus according to an embodiment of the present invention.
7 is a view showing a current flow in a charge mode of an electric drive apparatus according to an embodiment of the present invention.
8 is a view showing a current flow after completion of charging of the electric driving apparatus according to the embodiment of the present invention.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be further understood that the terms " comprises ", or "having ", and the like in the specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

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

FIG. 2 is a view showing a configuration of a charger built-in electric drive apparatus utilizing a motor winding according to an embodiment of the present invention. FIG. 3 is a diagram showing the configuration of the inverter unit shown in FIG. Fig. 5 is a view showing the flow of current when the electric motor stops driving the electric driving apparatus shown in Fig. 2, Fig. 6 is a view showing the flow of electric current in the electric driving apparatus shown in Fig. FIG. 7 is a view showing the flow of current in the charge mode of the electric drive apparatus shown in FIG. 2, and FIG. 8 is a view showing the flow of current in the boost mode of the electric drive apparatus shown in FIG. And the current flows.

2 to 8, the charger built-in electric drive apparatus 1 using the electric motor winding according to the embodiment of the present invention is configured such that the output of the battery is applied to the coil of the electric motor via the inverter unit in the drive mode, The output of the rectifying section is applied to the rectifying section via at least one coil and coil of the inverter and the motor, and in the charging mode, the output of the rectifying section is passed through the single point of the coil and the coil of the inverter section and the motor The apparatus 1 includes a battery 10, a rectifying section 30 for rectifying AC power, an inverter section 50 for converting DC power supplied from the battery 10 into AC power, And an electric motor 70 having a plurality of coils 701 for generating magnetic flux and driven by AC power supplied from the inverter unit 50. [

The control module 80 controls the switching unit 90 and the inverter unit 50. In the drive mode, the output of the battery 10 is applied to the motor 70 via the inverter unit 50, The output of the rectifying unit 30 is applied to the rectifying unit 70 via at least one coil 701 of the inverter unit 50 and the electric motor 70 and the single phase point 703 of the coil, A switching unit 90 for applying the output of the rectifying unit 30 to the battery 10 via at least one coil 701 of the inverter unit 50 and the electric motor 70 and a single phase point 703 of the coil 70 ).

One end of the rectifying unit 30 is connected to the switching unit 90 and the other end of the rectifying unit 30 is connected to the AC power source 20 to receive AC power. The switching unit 90 has two terminals, a first end connected to the anode of the battery 10, a second end connected to the output terminal of the rectifying unit 30, and a third end connected to the motor 70 . That is, the coil 701 of the electric motor 70 may be formed of a three-phase coil, and the single phase point 703, which is one of the three-phase coils of the electric motor 70, may be connected to the third end of the switching unit 90.

The switching unit 90 includes a main switch 901 having a first end, a second end and a third end for connecting the battery 10 and the inverter unit 50 in the drive mode, and a fourth and fifth end And a charging switch 903 for connecting the rectifying unit 30 and the inverter unit 50 in the charging mode. The fourth end of the charge switch 903 is connected to the main switch 901 to share the second end.

In this case, the drive mode means a state in which the inverter unit 50 operates the electric motor 70 with the electric power applied from the battery, and the boost mode means a state in which the electric motor 70 is charged with counter electromotive force generated when the motor stops. The mode means a state in which the battery 10 is being charged by the AC power source 20.

The control module 80 may be a gate driver or a micro control unit (MCU). The control module 80 can control the main switch 901, the charge switch 903 and the switching element 501 (Fig. 3) of the inverter section 50. [

3 shows an inverter section 50 of the electric drive system 1 according to the embodiment of the present invention. 3, the inverter unit 50 includes a capacitor, and includes a DC link terminal 507 to which DC power is applied, at least one switching element 501 for converting DC power into AC power, and a switching element 501 And a free wheeling diode 502 provided at both ends of the free wheeling unit.

The at least one switching element 501 is classified into a top switching element 503 connected to the anode of the battery 10 via the switching unit 90 and a bottom switching element 505 connected to the cathode of the battery 10 .

Here, the at least one switching device 501 may have three phases corresponding to the three-phase coil 701. The output terminal of the upper switching element 503 may be connected to the coil 701 and the input terminal of the lower switching element 505 may be connected to the coil 701.

Fig. 4 shows the current flow in the driving mode of the electric driving device 1 according to the embodiment of the present invention. 4, in the drive mode, the main switch 901 connects the battery 10 and the inverter unit 50, and the charge switch 903 opens the inverter unit 50 and the rectifier unit 30, do.

In the drive mode, the electric drive apparatus 1 receives DC power output from the battery 10 at the DC link terminal 507 of the inverter unit 50, and the inverter unit 50 converts the DC power into AC power, 70 are operated. In this case, the control module 80 controls the upper switching element 503 and the lower switching element 505 so that they are not turned on or off at the same time. Therefore, the upper switching element 501 and the lower switching element 505 operate complementarily.

That is, the main switch 901 connected to the pole of the battery amount (+) in the drive mode is connected to the positive terminal of the DC link terminal 507 of the inverter unit 50 and is connected to the AC power supplied from the outside The charging switch 903 for connecting the positive terminal on the right side of the DC link terminal 505 of the inverter section 50 to the external power supply is turned off so that the DC power outputted from the battery 10 is supplied to the inverter Is provided to the electric motor (70) via the DC link end (507) of the electric motor (50).

In addition, the series of processes for driving the electric motor 70 is the same as or similar to the series of processes operated by the drive signals SPWM and SVPWM supplied from the outside.

5, in the driving mode, the main switch 901 is connected to the battery 10 and the inverter unit 901. The main switch 901 is connected to the battery 10, And the charging switch 903 connects the inverter unit 50 and the rectifying unit 30. [

That is, the output of the freewheeling diode 502 of the lower switching element 505 is connected to at least one coil 701 of the electric motor 70 and the upper end point 703 of the coil and the main And is applied to the battery 10 via the switch 901. In this case, the control module 80 controls the upper switching element 503 and the lower switching element 505 to be turned on or off at the same time.

6 shows the flow of current in the boost mode of the electric drive system 1 according to the embodiment of the present invention. 6, in the boost mode, the charge switch 903 causes the output of the rectifying section 30 to be connected to the upper switching element 503 via the DC link terminal 507 of the inverter section 50. [ The AC power is converted into DC voltage lowered by the upper switching element 503 and the coil 701 of the motor 70 via the rectifying section 30 and the charging switch 903 and the converted DC power And is transmitted to the rectifying section 30 via the lower switching element 505.

At this time, the control module 80 controls the upper switching element 503 and the lower switching element 505 to be turned on at the same time.

Referring to FIG. 7, in the charging mode, the charging switch 903 is turned on when the output of the rectifying unit 30 is in the ON state, And is connected to the upper switching element 503 via the DC link terminal 507 of the inverter unit 50. The AC power is converted into DC power whose voltage is lowered by the upper switching element 503 and the coil 701 of the motor 70 and the converted DC power is supplied to the main switch 901 through the neutral line 703 of the motor 70 ).

In the charging mode, the main switch 901 connects the battery 70 to the single point 703 of the electric motor 70. For example, the main switch 901 connects the upper end point 703 of the motor constituting the electric motor 70 with the anode of the battery. In this case, the DC power converted through the at least one coil 701 and the single phase point 703 of the inverter unit 50 and the motor 70 is charged to the battery 10.

That is, in the charging mode, the charging switch 903 rectifies the rectified AC power that has passed through at least one of the left half bridge and the right half bridge of the rectifying section 50 via the upper switching element of the inverter section 50, To the coil 701 of the coil 701. [

In order to increase the inductance required for current smoothing in the charge mode, a plurality of (three-phase) coils of the three-phase coils of the motor 70 may be arranged in series without magnetic conflict, One or more switches of the upper switch element 503 are turned on to transmit the rectified AC power to the coil 701 of the motor 70 and the lower switch element 505 of the remaining inverter part 50 is turned off .

8, when the control module 80 controls the upper switching device 503 and the lower switching device 505 to be turned on in the boost mode after the completion of charging the battery 10, The output of the rectifier 30 is supplied to the rectifier 30 via the charging switch 903 and at least one coil 701 of the charging switch 903 and the upper switching element 503 and the motor 70 and via the upper phase switch 703 and the lower switching element 505, .

The output of the capacitor C connected to the first end of the main switch 901 is applied to the battery 10 to be charged.

As described above, since the inductance required for current smoothing is increased using at least one coil and coil of the electric motor, the inductance required for current smoothing is increased without adding additional inductors.

Also, even if the connection of the motor is a delta connection, the inductance of the coil of the motor connected in series can increase the inductance required for current smoothing.

In addition, a buck converter generally used in a charger includes a capacitor, a link stage, a switch, and an inductor. In the charging mode, the DC link stage 507 performs a link stage function of the buck converter, the upper switching element 503 functions as a switch of the buck converter, and the coil 701 of the motor 70 is connected to the buck converter Inductor function.

The control module 80 controls the inverter unit 50 in the drive mode, the boost mode, or the charge mode described above. In this embodiment, the control module 80 controls the upper switching element 503 and the lower switching element 505 to be turned on in the boost mode and controls the lower switching element 505 to be turned off in the charging mode . Therefore, in the charging mode, only the upper switching element 503 operates in the inverter section 50. [

In addition, the control module 80 can control the switching time of the inverter unit 50 so that the phase of the AC power input to the upper switching device 503 is differently input by 120 degrees. When the phase of the AC power is applied to the inverter unit 50 differently by 120 degrees, the quality of the electric power to be charged can be enhanced.

The present invention can implement the function of the converter for charging the battery by using the DC link terminal 507 of the inverter unit 50, the upper switching element 503 and the coil 701 of the electric motor 70. [ In general, the capacitors of the converter require high capacitance, the switches of the converter are expensive, and the inductance of the converter also requires a large number of turns.

According to the present invention, since the capacitor of the inverter unit 50 is large, the capacitor 701 has sufficient capacitance to perform the function of the converter, and in the charge mode in which the motor 70 is not operated, the coil 701 functions as the inductor of the converter Instead. In addition, since the high-priced converter switch is replaced by the top switching element 503 of the inverter unit 50, the electric driving apparatus 1 having low manufacturing cost and high degree of circuit integration can be realized.

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. will be. Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by all changes or modifications derived from the scope of the appended claims and equivalents of the following claims.

Since the inverter unit for driving the electric motor and the battery charger are integrally provided, it is possible to reduce the size of the charger built-in electric drive unit using the electric motor winding. In addition, since at least one coil and coil of the non- Since the conventional expensive converter separately provided for charging the battery is removed according to the inductance function, it has the advantage of reducing the manufacturing cost and maximizing the circuit integration degree. In integrating the inverter unit and the battery charger for driving the motor, Even if the neutral line of the motor is used, the motor does not need to be modified for the neutral line exposure and the inductance required for smoothing the current is increased. Accuracy of operation of the charger built-in electric driving device using the motor winding capable of stably charging the battery without additional configuration And It is possible to make a very great improvement in terms of reliability, performance and efficiency, and it is an industrially applicable invention since it is possible to carry out a commercial operation or an operation of a built-in charger built- .

Claims (9)

battery;
A rectifying unit for rectifying AC power supplied from the outside;
An inverter unit having a plurality of switching elements and a diode for a freewheel reel and converting DC power supplied from the battery into AC power;
An electric motor having a coil for generating magnetic flux and rotating by AC power supplied from the inverter; And
And the output of the rectifying unit is applied to the inverter unit in the charging mode. The electric driving apparatus according to claim 1,
2. The inverter circuit according to claim 1,
And the output of the battery is applied to the coil of the motor via the inverter in the motor drive mode.
2. The inverter circuit according to claim 1,
And the output of the rectifying section is applied to the rectifying section via at least one coil and coil of the motor in the boost mode when the motor is stopped.
3. The inverter of claim 2, wherein the inverter unit
An upper switching element connected to the anode of the battery via the switching unit,
And a lower switching element connected to the cathode of the battery. The electric driving device with built-in charger utilizing the electric motor winding.
4. The switching device according to claim 3, wherein the lower switching element
And is turned off in a charging mode.
The inverter circuit according to claim 3,
Wherein the output of the rectifying unit is applied to the battery via the upper switching element and at least one coil of the at least one coil and the coil of the motor in the charging mode.
6. The inverter circuit according to claim 5,
The output of the rectifying section is applied to the rectifying section via the upper switching element and the lower switching element of the at least one coil and the coil of the motor in the boost mode after the completion of the battery charging,
And an output of a capacitor connected to the positive electrode of the battery is applied to the battery. The plasma display apparatus according to claim 3,
A charging switch which is opened in a driving mode and switched so as to apply the output of the rectifying section to the inverter section in a charging mode; And
The output of the rectifying section that has passed through the charging switch in the charging mode is switched to be applied to the battery via at least one coil of the upper switching device and the motor and the one point of the coil in the driving mode, And a main switch connected to the main switch.
The electric power steering apparatus according to claim 1,
Further comprising a control module for controlling the switching unit and the inverter unit,
Wherein the control module controls the switching time of the inverter unit so that the phase of the AC power input to the upper switching device is differently input by 120 degrees.

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