KR20220122915A - Three phase and single phase compatible charger - Google Patents

Abstract

According to the present technology, disclosed is a charger for both a three-phase and a single-phase. According to a specific example of the present invention, a battery charger of a single-phase and three-phase single-terminal structure is realized without an electrolytic capacitor that lowers reliability and charging efficiency to be compatible with single-phase and three-phase external power sources, charging efficiency and performance of a wide input/output voltage range can be increased with a reduced number of switching elements and a switching operation of the switching elements, reliability and a lifespan can be increased, and at least two of an inductor for ripple removal of the battery charger, a primary side and a secondary side of a transformer, and an inductor for noise removal are integrated into one core to realize a lightweight charger.

Description

THREE PHASE AND SINGLE PHASE COMPATIBLE CHARGER

The present invention relates to a three-phase and single-phase charger, and more particularly, to a technology that has a single-stage circuit and an integrated core without an electrolytic capacitor to reduce the price and volume of a battery charger for an electric vehicle and improve charging efficiency. it's about

As the international market of electric vehicles is recently activated in earnest, the need for development of single-phase/three-phase combined use of a wide voltage range to satisfy various system voltages and types by country is increasing.

The structure of the charger for electric vehicle is a modular two-stage structure, which is widely used at present, but has limitations in power density and efficiency due to the large number of elements. There is a problem with the short lifespan. Due to these conventional circuit limitations, a circuit having a single-stage structure without an electrolytic capacitor has been recently proposed.

Recently, a single-phase/3-phase OBC (On Board Charger) charger for electric vehicles of a single-stage structure without electrolytic capacitors achieved high efficiency and power density with a small number of elements. However, due to the characteristics of the single-stage dual-active-bridge circuit, the performance is not good in a wide input/output voltage range, and a separate decoupling circuit is required for single-phase operation.

In addition, the conventional charger, as shown in Figure 1, the inductor (L _s1 )) (L _s2 ) of the ripple removal unit 110, the transformer 141, the inductor (L g1 ) of the noise removal unit 142 (L _g1 ) (L _g2 ), etc., require a lot of magnetic material, which has the disadvantage of increasing the volume and manufacturing cost of the charger.

An object of the present invention is to provide a three-phase and single-phase charger having a reduced number of switching elements and high efficiency, high density and high reliability by implementing an AC-DC converter without an electrolytic capacitor as a single-stage circuit.

Therefore, unlike the existing single-stage circuit, it has high performance in a wide input/output voltage range, and a power decoupling circuit is configured without an additional switching element, enabling DC charging of the battery.

Accordingly, by integrally forming a plurality of cores of a three-phase and single-phase charger on one plate, the price and volume of a charger for an electric vehicle to which a three-phase and single-phase AC-DC converter is applied can be reduced, and thus a lightweight charger can provide

The object of the present invention is not limited to the object mentioned above, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof indicated in the claims.

Three-phase and single-phase combined charger according to an embodiment of the present invention,

and first to third modules for converting each of the three-phase external power source into a high voltage direct current form and then charging the battery,

a first relay switch for transferring single-phase external power to the second module;

It is characterized in that it further comprises a second relay switch that blocks the single-phase external power from being transmitted to the third module.

Preferably, the three-phase and single-phase charger

For three-phase external power, the first relay switch is controlled to open and the second relay switch is controlled to close, so that the external power of each three-phase is supplied to the first to third modules, respectively,

For the external power of the single phase, the first relay switch is controlled to close and the second relay switch is controlled to open, so that the external power of the single phase is supplied to the first module and the second module, respectively, and to block the supply to the third module can be provided.

Preferably, each module comprises:

a ripple removing unit provided as an inductor connected in parallel to one end of the external power provided through the first and second relay switches to remove a ripple component of the external power;

an inverter connected to an output terminal of each of the ripple controllers to convert an external power source of a low frequency component into an AC form of a high frequency component;

a capacitor for half-wave rectifying the AC component of the output signal of the inverter;

a transformer connected to the output terminal of the capacitor and passing the output signal of the capacitor;

a noise removing unit provided with inductors respectively connected to one end and the other end of the secondary side of the transformer to remove a noise component included in the secondary side output signal of the transformer;

an AC-DC converter connected to an output terminal of each inductor of the noise canceling unit to convert an output signal of the inductor into a DC form; and

It may include a filter unit provided as a capacitor connected between one end and the other end of the AC-DC converter to remove a noise component included in the output signal of the AC-DC converter and then charge the output signal of the high-frequency component to the battery.

Preferably the third module,

Further comprising a decoupling unit for intermittent control of the output signal of the filter unit,

The decoupling unit,

a third relay switch connected in series to the intermediate step of the secondary side of the transformer to decouple the output terminal of the secondary side of the transformer and the battery when a single-phase external power is cut off; and

It may further include an energy intermittent capacitor for charging and discharging the low-frequency component of the output signal of the filter unit.

Preferably, the decoupling unit,

With respect to the three-phase external power source, as the third relay switch is controlled to open based on a control signal supplied from the outside, the output signal of the filter unit of the third module may be supplied to the battery.

Preferably, the decoupling unit

As for the single-phase external power source, as the third relay switch is controlled to close based on a control signal supplied from the outside, the output signal of the filter unit may be transmitted to the energy intermittent capacitor.

Preferably, each module comprises:

At least two of the inductor for removing the ripple, the primary side and the secondary side of the transformer, and the inductor of the noise removing unit may be integrated into a pair of plates made of a magnetic material to form a single core.

Preferably, the core comprises:

It is provided as a pair of plates including a lower plate integrally formed with both sides and central legs installed on both sides and the center, and an upper plate attached to the central leg and connected to the lower plate to form a magnetic body,

The inductor of the ripple removing unit may be wound on lower sides of both legs of the lower plate, respectively, and the primary and secondary sides of the transformer may be wound on upper sides of both legs of the lower plate.

Preferably, the core

A pair of plates forming a magnetic body, including a lower plate integrally formed with both legs, a center leg, and a winding leg between both legs and the center leg, and an upper plate attached to the center leg and connected to the lower plate become,

The inductor of the ripple removing unit may be wound on the lower side of the winding leg of the lower plate, respectively, and the primary side and the secondary side of the transformer may be wound on the upper side of the winding leg of the lower plate.

Preferably, the core comprises:

It is provided with a pair of plates including a lower plate in which both front legs, rear both legs, and one central leg are integrally formed, and an upper plate attached to the central leg and connected to the lower plate,

The ripple removing unit inductor is wound on the lower side of both front legs of the lower plate, respectively, the primary side and the secondary side of the transformer are wound on the upper side of both front side legs of the lower plate, and the noise removing unit connected to the secondary side of the transformer An inductor may be wound on both legs of the rear side of the lower plate, respectively.

According to these features, as a battery charger with a single-phase and three-phase structure is implemented without an electrolytic capacitor that degrades reliability and charging efficiency, it is compatible with single-phase and three-phase external power sources, and the number and switching of switching elements is reduced. The soft switching operation of the device can improve charging efficiency and performance over a wide input/output voltage range, and improve reliability and lifespan.

In addition, since the inductor for removing the ripple of the battery charger, the primary and secondary sides of the transformer, and the inductor for removing the noise are integrated into one core, there is an effect that a lightweight charger can be implemented.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is a matter described in such drawings should not be construed as being limited only to
1 is a view showing the core of a typical charger.
2 is an overall circuit diagram of a charger according to an embodiment.
3 is a conceptual diagram of a three-phase external power source of a charger according to an embodiment.
4 is an output waveform diagram of each part of FIG. 3 .
5 is a conceptual diagram of a single-phase external power source of a charger according to an embodiment.
6 is an equivalent circuit diagram of a third module of the charger of FIG. 5 .
Fig. 7 is an output waveform diagram of each part of Fig. 5;
8 is an exemplary diagram of a core of a charger according to an embodiment.
9 is another exemplary diagram of a core of a charger according to an embodiment.
10 is another exemplary diagram of a core of a charger according to an embodiment.
11 is another exemplary diagram of a core of a charger according to an embodiment.

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

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

Terms used in this specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. Also, as used herein, the term “unit” refers to a hardware component such as software, FPGA, or ASIC, and “unit” performs certain roles. However, "part" is not meant to be limited to software or hardware. A “unit” may be configured to reside on an addressable storage medium and may be configured to refresh one or more processors.

Thus, by way of example, “part” refers to components such as software components, object-oriented software components, components and task components, and processes, functions, properties, procedures, sub It includes routines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays and variables. The functionality provided within components and “parts” may be combined into a smaller number of components and “parts” or further divided into additional components and “parts”.

Prior to the description of the present specification, some terms used in the present specification will be clarified. In the present specification, the high frequency component determined based on the battery capacity (for example, 3 kW) for the electric vehicle may be set to 150 kHz, and the low frequency component may be set to 60 Hz, and the output signal means voltage and current, and thus output voltage, output current , and an output signal will be mixed and described.

Here, the three-phase external power supply has been described as having a module for each phase as an example, but may be provided with the same number of modules as the multi-phase external power supply, and the number of phases and modules of the external power supply is not limited thereto. .

With reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description will be omitted.

For example, in one embodiment, as a plurality of modules implement a battery charger equipped with a three-phase and single-phase single-stage structure to be compatible with a three-phase or single-phase external power source, the single-phase or three-phase AC type external power source is converted into a direct current form. Convert and charge the battery.

Hereinafter, a single-phase and three-phase combined battery charger according to an embodiment will be described with reference to the accompanying drawings.

Figure 2 is an overall configuration diagram of the charger according to an embodiment, Figure 3 is a diagram for explaining the operation of the three-phase external power supply of the charger of Figure 2, Figure 4 is an output waveform diagram of each part of Figure 3, 5 is a diagram for explaining the operation of the single-phase external power source of the charger of FIG. 2, FIG. 6 is an equivalent circuit diagram of the third module of the charger of FIG. 5, and FIG. 7 is an output waveform diagram of each part of FIG. .

2 to 7, the single-phase and three-phase combined battery charger of one embodiment is a three-phase external power supply v _ga , v _gb , v _gc in parallel on each phase of the modules (1) (2) (3) are connected, respectively and is provided to convert the external power of each phase into a DC form, so that each of the modules (1), (2) and (3) is a first relay switch (Relay1), a second relay switch (Relay2), a ripple removing unit (110) ( 210) 310, inverter 120, 220, 320, rectifier 130, 230, 330, transformer 141, 241, 341, noise controller 142, 242, 342 , AC-DC converters 150 , 250 , 350 , and filter units 160 , 260 and 360 .

The input terminals of the modules (1)(2)(3) of each phase connected to one end of the three-phase external power supply v _ga , v _gb , v _gc are provided with three input ports a, b, c and a neutral point n, and the module of each phase (1) The output terminal of (2) (3) is connected to the battery (V _B ). In addition, the second module 2 of the single-phase and three-phase combined battery charger further includes a first relay switch (Relay1) connected to one end of the external power source.

And, the third module 3 includes a second relay switch (Relay2) connected to one end of a single-phase or three-phase external power supply, a third relay switch (Relay3) connected to the secondary side center tap of the transformer, and a capacitor for energy regulation A decoupling unit 351 including (C _pd ) may be further included. Here, each of the three-phase external power sources v _ga , v _gb , and v _gc is an AC power supplied with a phase difference of 120 degrees.

Accordingly, an embodiment of the three-phase external power supply v _ga , v _gb , v _gc is controlled to close the second relay switch (Relay2) and open the first relay switch (Relay1) and the third relay switch (Relay3) and the capacitor Based on (C _pd ), it is decoupled between the central tap of the transformer and the battery to convert the external power of each phase into a DC form of each phase and then charge the battery (V _B ).

In addition, one embodiment is based on the first relay switch (Relay1) and the third relay switch (Relay3) controlled to be closed and the second relay switch (Relay2) controlled to be open with respect to the single-phase external power source v _ga , the transformer of the medium voltage step and The decoupling operation between the batteries converts the external power of a single phase into a DC form, and then the battery (V _B ) can be charged.

That is, the first relay switch Relay1 is connected between one end of the single-phase external power supply and the second module 2 to supply the single-phase AC power to the second module 2 .

On the other hand, the second relay switch (Relay2) is connected between the other end of the external power source and the third module (3) to supply a single-phase external power to the third module (3).

Each module (1) (2) (3) receives the external power v _ga , v _gb , v _gc of each phase supplied from the outside through the first relay switch (Relay1) and the second relay switch (Relay2), respectively. It has a configuration that converts it to a direct current form.

The ripple removing unit 110 of the module 1 has a configuration of inductors L _g1 , L _g2 connected in parallel to each of the external power sources v _ga , v _gb , v _gc , and thus the external power supply v _ga , v _gb of each phase , v Removes the ripple component included in _gc .

The output terminals of the inductors L _g1 and L _g2 are connected to the inverter 120 of the module 1, and the inverter 120 is provided with a plurality of switching elements S1 to S6 in parallel to the output terminals of the inductors L _g1 and L _g2 . The first and second switching elements S1 and S2 and the third and fourth switching elements S3, S4 and the fifth and sixth switching elements S5 and S6 respectively complement each other for switching. Here, the connection structure of the plurality of switching elements S1 to S6 is already applied in the battery charger, and although the connection structure of the plurality of switching elements S1 to S6 is not specifically specified in this specification, it should be understood at the level of those skilled in the art.

In addition, the rectifying unit 130 of the module 1 is connected in parallel between the input terminal and the output terminal of the inverter 120 , and each rectifying unit 130 is provided as a capacitor C _a , and the rectifying capacitor C _a is the inverter 120 . ), the AC (alternating current) component included in the output signal is clamped to achieve half-wave rectification.

On the other hand, each output terminal of the inverter 120 is connected to the primary side of the transformer 141 of the module 1, and the transformer 141 passes the output signal of the rectification capacitor C _a and then to the noise removal unit 142. is transmitted, and the noise removing unit 142 removes a noise component included in the output signal of the transformer 141 . Here, the transformer 141 is provided as a transformer 141 having a turns ratio of 1:1 and an inductor L _s1 (L _s2 ) of the noise removing unit 142 connected to one end and the other end of each transformer 141 , respectively. As another example, the output signal of the rectification capacitor C _a may be amplified according to the turns ratio of the primary side coil and the secondary side coil of the transformer 141 .

The AC-DC converter 150 of each module 1 is connected to the output terminal of each noise removal unit 142 inductor (L _s1 ) (L _s2 ), and the AC-DC converter 150 is the transformer 140 . ) to convert the output signal into direct current.

Here, the AC-DC converter 150 is provided with switching elements S7 to S10, and each of the seventh and eighth switching elements S7 and S8 and the ninth and tenth switching elements S9 and S10 is of a controller (not shown). They are switched complementary to each other based on a switching signal. Here, the switching signal of the controller may receive the current and voltage supplied to the already applied battery and apply the switching signal for operating the switching element of each inverter and the switching element of the AC-DC converter, and in the present specification, the controller Processes for deriving the switching signal of are not specifically specified, but should be understood at the level of those skilled in the art.

Each output terminal of the AC-DC conversion unit 150 of the module 1 is connected to the filter unit 160 of the module 1 , and the filter unit 160 is between one end and the other end of the AC-DC conversion unit 150 . It is provided with a capacitor C ₀ connected to , removes a noise component included in the output signal of the AC-DC converter 150 and then transfers it to the battery (V _B ).

On the other hand, the module 2 converts the three-phase external input v _gb received by the open control of the first relay switch (Relay1) into a DC form and transmits it to the battery (V _B ). It includes a rejection 210 , an inverter 220 , a rectifying unit 230 , a transformer 241 , a noise removing unit 242 , an AC-DC converting unit 250 , and a filter unit 260 .

Module (3) converts the three-phase external input v _gc received by the closing control of the second relay switch (Relay2) into DC form and transmits it to the battery (V _B ) The ripple removal unit ( 310 ), an inverter 320 , a rectifying unit 330 , a transformer 341 , a noise removing unit 342 , an AC-DC converting unit 350 , and a filter unit 360 .

Accordingly, the connection structure for the modules (2) and (3) is not specifically specified in the present specification, but should be understood at the level of those skilled in the art.

In addition, the module 3 has a configuration for decoupling between the central tap of the transformer and the filter unit 360 based on the third relay switch (Relay3) and the capacitor (C _pd ) that are controlled to open.

Hereinafter, when the external power source is three-phase, an operation process of the single-phase and three-phase charger will be described with reference to FIGS. 2 and 3 .

That is, when the external power supply v _ga , v _gb , v _gc supplied from the outside is three-phase Under the control of a controller (not shown), the first relay switch (Relay1) and the third relay switch (Relay3) are controlled to be open, and the second relay switch (Relay2) is controlled to be closed.

Accordingly, each of the external power sources v _ga , v _gb , and v _gc of each phase is transmitted to each module (1) (2) (3), and the output signal of each module (1) (2) (3) is overlapped and the battery (V _B ) is charged. When explaining the operation process of the module 1 , the external power v _ga is transferred to the inverter 120 after the ripple component is removed based on the ripple removing unit 110 . At this time, the external power supply v _ga from which the ripple component is removed is a low frequency component.

And the inverter 120 converts the external power supply v _ga of the low-frequency component from which the ripple is removed into the high-frequency component, and the converted high-frequency component output signal is transmitted to the rectifying unit 130 , thereby the output signal of the high-frequency component of the inverter 120 . is half-wave rectified by the capacitor C _a of the rectifying unit 130 .

Each output signal of the rectifying unit 130 is transferred to the primary side of the transformer T1 of the transformer 140 of each module 1 and then excited to the secondary side, whereby the output signal of the rectifying unit 130 is the transformer T1 ) through the inductor for noise removal (L _s1 ) (L _s2 ).

The output signal of the transformer 141 is the noise removal unit 142 inductor (L _s1 ) (L _s2 ) The noise component is removed based on the inductor (L _s1 ) (L _s2 ) The output of the high frequency component from which the noise component is removed The signal is transferred to the AC-DC converter 150 .

The AC-DC converter 150 is an output of a high-frequency component inductor (L _s1 ) (L _s2 ) based on the operation of the switching elements (S7 to S10) by a switching signal of a controller (not shown) supplied from the outside Converts the signal to direct current. Here, the output signal of the high frequency component of the direct current type has the noise component removed based on the capacitor (CO) of the filter unit 160, and the _output signal of the capacitor ( _CO ) of the filter unit 160 is connected to the battery (V _B ). is supplied Although not specifically specified in this specification, the modules (2) and (3) operate in the same manner as the module (1).

And, the decoupling unit 351 of the module 3 is the middle tap of the secondary side of the transformer 141 based on the relay switch Relay3 controlled to open based on the control signal of the controller and the capacitor C ₀ of the filter unit 360 ) is decoupled.

Referring to FIG. 4, the current i _B of the battery (V _B ) of the high-frequency component of 150 kHz is the output current i _oa(DC) , i _ob(DC) , i of each module (1)(2)(3) It can be seen that _oc(DC) overlaps. In this case, the charging voltage of the battery may be 240V in the low frequency region and 400 ~ 800V in the high frequency region.

Meanwhile, referring to FIGS. 5 to 7 , the single-phase external power supply v _ga is When connected, the first relay switch (Relay1) and the third relay switch (Relay3) are controlled to be closed, and the second relay switch (Relay2) is controlled to be opened, according to a control signal from a controller (not shown). Accordingly, the single-phase external power supply v _ga is transferred to the module 2 via the first relay switch Relay1, and the modules 1 and 2 supply the single-phase external power supply v _ga . The high frequency component is converted into a DC form, and the output signal of each module 1 and 2 of each DC form of the high frequency component is superimposed and transmitted to the battery V _B .

The single-phase external power supply v _ga is It is transmitted to each of the ripple removing units 110 and 210 of the modules (1) and (2), and each of the ripple removing units 110 and 210 removes the ripple component included in the single-phase external power source v _ga .

In addition, each output signal of the ripple removing unit 110 and 210 is transmitted to the inverters 120 and 220, respectively, and the inverters 120 and 220 are the external power v _ga of the low frequency component. It is converted into a high-frequency component, and the external power supply of the high-frequency component is v _ga is transferred to each of the capacitors C _a , C _b of each of the rectifying units 130 and 230 , and is half-wave rectified.

The output signals of each of the capacitors C _a and C _b of each of these rectifying units 130 and 230 are transmitted to the transformers 141 and 241 , and each of the transformers 141 and 241 is the respective rectifying units 130 and 230 . The output signals of the capacitors C _a and C _b are passed from the primary to the secondary of the transformers 141 and 241 to the inductors L _s1 (L _s2 ) of the noise removal units 142 and 242, respectively. , the noise component included in the output signal of the transformer is removed.

And the output signal of each of the transformers 141 and 241 of the module (1) (2) is converted into a DC form based on the AC-DC converter 150, 250 of the phase of the module (1) (2), and then the high frequency The output signal of the AC-DC conversion unit 150 and 250 of the component is transmitted to the filter unit 160 and 260, The filter unit 160 and 260 removes the noise component included in the output signal of the AC-DC converter 150 and 250 of the high-frequency component, and then converts the output signals i _{oa (DC)} , i _{ob (DC)} to the battery ( to V _B ).

On the other hand, as shown in FIG. 5 based on the closing control of the third relay switch (Relay3), the charging voltage of the capacitor C ₀ of the filter unit 360 is 2 of the transformer 341 based on the switch operation of the switching element S7. It is discharged to the energy intermittent capacitor (C _pd ) via the secondary side intermediate tap, and the charging voltage of the energy intermittent capacitor (C _pd ) based on the switching operation of the switching element (S10) is the secondary side intermediate tap of the transformer 341 It is charged in the capacitor C ₀ of the filter unit 360 via the .

Accordingly, it is equivalent to a current source having a phase with DC and 120 Hz, and the output signal of the module (1) (2) is i _{oa (DC)} + i _{ob (DC)} , and the closing control is applied to the third relay switch (Relay3). As a result, the switching elements S4 and S6 of the inverter 320 become short-circuited, and the equivalent impedance becomes 0, and the transformer 341 is deactivated. Therefore, the AC-DC converter 350 of the module 3 is a two-phase interleaved buck converter is equivalent to

Accordingly, referring to FIG. 7 , the current i _B of the battery V _B of the high-frequency component of 150 kHz is the sum of the output currents i _{oa (DC)} and i _{ob (DC)} of each module ( 1 ) ( 2 ). Meanwhile, the charging voltage of the filter unit 360 of the low frequency component is removed based on the energy intermittent capacitor (C _pd ).

In the case of a single-phase external power supply v _gc , the secondary inductor (L _s1 , L _s2 ) of the transformer 341 of the module 3, the capacitor C _pd , and the seventh to tenth switching elements (S7 to S10) based on the interleaved operation The current rating of the capacitor C _pd may be reduced.

In addition, as the seventh to tenth switching elements S7 to S10 perform zero voltage switching (ZVS) in the high-frequency switching operation, the efficiency can be maximized. Charging is possible.

Accordingly, one embodiment is compatible with single-phase and three-phase external power sources as the charger is implemented as an AC-DC converter of a single-phase and three-phase combined single-phase structure without an electrolytic capacitor that reduces reliability and charging efficiency, and the number of devices reduced, which can improve charging efficiency and performance, reliability and lifetime over a wide input/output voltage range.

On the other hand, in one embodiment, each inductor (L _g1 ) (L _g2 ) of the ripple removing unit 110 of each module 1, the transformer 141, and the inductor (L _s1 ) of the noise removing unit 142 ( At least two of L _s2 ) may be manufactured as one integrated core.

8 to 11 show the primary and secondary sides of the inductor Lg1 (Lg2) of the ripple removing unit 110 of the module 1 and the transformer 141 of the transformer 140 and the noise removing unit 142 of FIG. The inductor (L _s1 ) (L _s2 ) is a diagram showing the configuration of one integrated core.

Referring to FIG. 8 , an exemplary core is attached to a lower plate 510a in which three legs, such as both legs 501a and 501b and a central leg 503 are integrally formed, and the central leg 503 . and an upper plate 510b connected to the lower plate 510a.

And, the inductor (L _g1 ) (L _g2 ) of the ripple removal unit 110 is wound on the lower surfaces of both legs 501a and 501b, respectively, and the primary side and the secondary side of the transformer 141 are both legs 501a. Each is wound on the bottom surface of 501b. Accordingly, the ripple removing unit 110, the inductor (L _g1 ) (L _g2 ), and the primary and secondary sides of the transformer 141 may be implemented by a single integrated core.

And, one end of the primary winding of the transformer 141 is connected to the output terminal of the inductor L _g1 and the output terminal of the switching device S4 through nodes a and o, and the other end of the primary winding of the transformer 141 is a node It is connected to the output terminal of the inductor L _g2 and the input terminal of the switching element S6 through b and o. Here, node o is the ground of the external power supply.

On the other hand, each of one end and the other end of the secondary winding of the transformer is connected in series to the inductor (L _s1 ) and the inductor (L _s2 ) through nodes c and d, and both legs (501a) (501b) of the lower plate (510a) An air gap 510c may be formed in at least one of the and the central leg 503 , and the inductance control and magnetic flux saturation of the upper and lower plates 510a and 510b of the magnetic material are prevented by the air gap.

Accordingly, in one embodiment, the inductor (L _g1 ) (L _g2 ) of the ripple removing unit 110 and the primary and secondary sides of the transformer 141 are manufactured with one integrated core, thereby providing a lightweight charger.

Referring to FIG. 9 , in another example, the core includes both legs 531a and 531b, a central leg 533, and winding legs 535a and 535b between the opposite legs 531a and 531b and the central leg 533. has a configuration of an integrally formed lower plate 530a and an upper plate 530b attached to the central leg 533 and connected to the lower plate 530a.

And, the inductor (L _g1 ) (L _g2 ) of the ripple removing unit 110 is wound on the lower side of the winding leg winding legs 535a and 535b of the lower plate 530a, respectively, the primary side of the transformer 141 and The secondary side is wound on the upper side of the winding legs 535a and 535b of the lower plate 530a, and both legs 531a and 531b between the upper and lower plates 530a and 530b, and the winding leg 535a. An air gap 530c is formed in at least one of the 535b, and the inductance is controlled and the magnetic flux saturation of the upper and lower plates 530a and 530b of the magnetic material is prevented by the air gap 530c.

Referring to Figure 10, according to another example, the core is a lower plate (550a) in which the front both legs (551a) and (551b), the rear both legs (551c) (551d), and one central leg (553) are integrally formed. and an upper plate 550b attached to the central leg 553 and connected to the lower plate 550a.

As an air gap 550c is formed in at least one of the front side legs 551a and 551b, the rear side legs 551c and 551d, and the center leg 553 of the lower plate 550a, the inductance is adjusted and Flux saturation of the upper and lower plates 530a and 530b is prevented.

And the inductor (L _g1 ) (L _g2 ) of the ripple removing unit 110 is wound on the lower side of both front legs 551a and 551b of the lower plate 550a, respectively, the primary side and the secondary side of the transformer 141 The inductor (L _s1 ) (L _s2 ) of the noise removing unit 142 that is wound on the upper side of the both front legs 551a and 551b of the lower plate 550a and connected to the secondary side of the transformer is the lower plate 550a. ) may be wound on both rear side legs 551c and 551d, respectively.

One end of the primary winding of the transformer 141 is connected to the output terminal of the inductor L _g1 and the output terminal of the switching device S4 through nodes a and o, and the other end of the primary winding of the transformer 141 is node b, It is connected to the output terminal of the inductor L _g2 and the input terminal of the switching element S6 through o. Here, node o is the ground of the external power supply.

On the other hand, as each of one end c and the other end d of the secondary winding of the transformer 141 is damaged in series with the inductor L _s1 and the inductor L _s2 through the nodes e and f, the inductor ( L _g1 ) (L _g2 ), the transformer 141 and the inductor L _s1 (L _s2 ) of the noise removal unit 142 are integrally formed into one core.

Referring to FIG. 11 , in another example, the core includes both legs 571a and 571b, a center leg 573, and front winding legs 575a and 575b between the legs 571a and 571b and the center leg 573. ) and rear winding legs 575c and 575d are integrally formed with a lower plate 570a and an upper plate 570b attached to the central leg 573 and connected to the lower plate 570a.

And, the inductor (L _g1 ) (L _g2 ) of the ripple removal unit 110 is wound on the lower side of the front winding legs 575a and 575b of the lower plate 570a, respectively, the primary side and the second side of the transformer 141 The secondary side is wound on the upper side of the front winding legs 575a and 575b of the lower plate 530a and the front winding legs 575c and 575d, and both legs 571a between the upper and lower plates 570a and 570b. ) 571b, the center leg 573, the front winding legs 575a, 575b, and the rear winding legs 575c and 575d are formed with an air gap 570c, and an inductance is formed by the air gap 570c. Control and saturation of the magnetic flux of the upper and lower plates 570a and 570b of the magnetic body are prevented.

One embodiment can obtain an advantage that can be applied to a lightweight charger in terms of price and volume based on one integrated core.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and those of ordinary skill in the art to which various modifications and equivalent other embodiments are possible. will understand Therefore, the technical protection scope of the present invention should be defined by the following claims.

By implementing a single-phase battery charger with a single-phase and three-phase structure without an electrolytic capacitor that degrades reliability and charging efficiency, it is compatible with single-phase and three-phase external power sources and reduces the number of switching elements and soft switching operation of the switching elements can improve charging efficiency and performance of a wide input/output voltage range, improve reliability and lifespan, and combine at least two of an inductor for removing ripple of a battery charger, primary and secondary sides of a transformer, and an inductor for removing noise into one By integrating into the core, it is possible to bring a very big improvement in terms of operation accuracy and reliability, and furthermore, in terms of performance efficiency for a three-phase and single-phase charger that can realize a lightweight charger, and the possibility of commercialization or sales of electric vehicle chargers This is not only sufficient, but it is an invention that has industrial applicability because it can be clearly implemented in reality.

Claims (10)

First to third modules for converting each three-phase external power source into a high-voltage direct current form and then charging the battery with respect to the three-phase external power source,
a first relay switch for transferring single-phase external power to the second module with respect to single-phase external power; and
With respect to the single-phase external power source, the charger for both three-phase and single-phase use, characterized in that it further comprises a second relay switch to block the single-phase external power from being transmitted to the third module. The charger according to claim 1, wherein the three-phase and single-phase charger is
For three-phase external power, the first relay switch is controlled to open and the second relay switch is controlled to close, so that the external power of each three-phase is supplied to the first to third modules, respectively,
For the external power of the single phase, the first relay switch is controlled to close and the second relay switch is controlled to open, so that the external power of the single phase is supplied to the first module and the second module, respectively, and to block the supply to the third module A charger for both three-phase and single-phase use, characterized in that it is provided. According to claim 1, wherein each module,
a ripple removing unit provided as an inductor connected in parallel to one end of the external power provided through the first and second relay switches to remove a ripple component of the external power;
an inverter connected to an output terminal of each of the ripple controllers to convert an external power source of a low frequency component into an AC form of a high frequency component;
a capacitor for half-wave rectifying the AC component of the output signal of the inverter;
a transformer connected to the output terminal of the capacitor and passing the output signal of the capacitor;
a noise removing unit provided with inductors respectively connected to one end and the other end of the secondary side of the transformer to remove a noise component included in the secondary side output signal of the transformer;
an AC-DC converter connected to an output terminal of each inductor of the noise canceling unit to convert an output signal of the inductor into a DC form; and
It is provided as a capacitor connected between one end and the other end of the AC-DC converter to remove the noise component included in the output signal of the AC-DC converter, and then comprises a filter unit for charging the output signal of the high-frequency component to the battery Charger for both three-phase and single-phase. According to claim 3, wherein the third module,
Further comprising a decoupling unit for intermittent control of the output signal of the filter unit,
The decoupling unit,
a third relay switch connected in series to the secondary side intermediate step of the transformer to decouple the secondary side output terminal of the transformer and the battery; and
Three-phase and single-phase charger for charging and discharging the low-frequency component of the output signal of the filter unit further comprises a capacitor for intermittent energy. 5. The method of claim 4, wherein the decoupling unit,
With respect to the three-phase external power source, as the third relay switch is controlled to open based on a control signal supplied from the outside, the output signal of the filter unit of the third module is supplied to the battery. 5. The method of claim 4, wherein the decoupling unit
With respect to the single-phase external power source, as the third relay switch is controlled to close based on a control signal supplied from the outside, the output signal of the filter unit is transmitted to the energy intermittent capacitor. . According to claim 3, wherein each module,
Three-phase and single-phase combined use, characterized in that at least two of the inductor of the ripple removing unit, the primary and secondary sides of the transformer, and the noise removing unit inductor are integrated into a pair of plates made of a magnetic material to form a single core charger. According to claim 7, wherein the core,
It is provided as a pair of plates including a lower plate integrally formed with both sides and central legs installed on both sides and the center, and an upper plate attached to the central leg and connected to the lower plate to form a magnetic body,
Three-phase and single-phase charger, characterized in that the inductor of the ripple removing unit is wound on the lower side of both legs of the lower plate, respectively, and the primary side and the secondary side of the transformer are provided such that the upper side of both legs of the lower plate is wound . 8. The method of claim 7, wherein the core
A pair of plates forming a magnetic body, including a lower plate integrally formed with both legs, a center leg, and a winding leg between both legs and the center leg, and an upper plate attached to the center leg and connected to the lower plate become,
The inductor of the ripple removal unit is respectively wound on the lower side of the winding leg of the lower plate, and the primary side and the secondary side of the transformer are provided so as to be wound on the upper side of the winding leg of the lower plate. . According to claim 7, wherein the core,
It is provided with a pair of plates including a lower plate in which both front legs, rear both legs, and one central leg are integrally formed, and an upper plate attached to the central leg and connected to the lower plate,
The inductor of the ripple removing unit is wound on the lower side of both legs of the front side of the lower plate, respectively, the primary side and the secondary side of the transformer are wound on the upper side of both legs of the front side of the lower plate, and the noise agent connected to the secondary side of the transformer A charger for both three-phase and single-phase use, characterized in that the rejection inductor is wound on both legs of the rear side of the lower plate, respectively.

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