KR102537472B1 - Three phase and single phase compatible charger - Google Patents

Abstract

The present technology discloses a charger for both three-phase and single-phase use. According to a specific example of the present invention, by implementing a battery charger with a single-phase and three-phase single-phase structure without an electrolytic capacitor that deteriorates reliability and charging efficiency, it is compatible with single-phase and three-phase external power supplies and reduces the number of switching elements. The soft switching operation of the number and switching elements can improve charging efficiency and the performance of a wide input/output voltage range, and can improve reliability and lifespan. A lightweight charger can be implemented by integrating at least two of the removal inductors into one core.

Description

Three-phase and single-phase combined charger {THREE PHASE AND SINGLE PHASE COMPATIBLE CHARGER}

The present invention relates to a charger for both three-phase and single-phase, and more particularly, to a technology capable of reducing the price and volume of a battery charger for an electric vehicle and improving charging efficiency by having a single-stage circuit and an integrated core without an electrolytic capacitor. it's about

Recently, as the international market for electric vehicles has been activated in earnest, the need for development of single-phase/three-phase combined use with a wide voltage range to satisfy various system voltages and types of each country is increasing.

The structure of the electric vehicle charger is a modular 2-stage structure, which is currently widely used, but has limitations in power density and efficiency due to the large number of elements, and is bulky and There are short-lived problems. Due to these conventional circuit limitations, a circuit having a single-stage structure without an electrolytic capacitor has recently been proposed.

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

In addition, as shown in FIG. 1, the conventional charger includes an inductor (L _s1 ) (L _s2 ) of the ripple removal unit 110, a transformer 141, and an inductor (L _g1 ) (L of the noise removal unit 142). _g2 ), etc., and thus, the volume of the charger and the manufacturing cost increase.

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

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

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

The object of the present invention is not limited to the above-mentioned object, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations thereof set forth in the claims.

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

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

A first relay switch for transmitting single-phase external power to the second module;

It is characterized in that it further comprises a second relay switch for blocking the transmission of single-phase external power to the third module.

Preferably, the three-phase and single-phase combined charger

Regarding the three-phase external power, as the opening of the first relay switch is controlled and the closing of the second relay switch is controlled, the three-phase external power is supplied to the first to third modules, respectively,

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

Preferably, each module,

a ripple removal unit provided as an inductor connected in parallel to one end of the external power supplied 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 low-frequency external power to high-frequency alternating current;

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

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

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

an AC-DC conversion unit connected to the output terminal of each inductor of the noise removal unit and converting the output signal of the inductor into a direct current form; and

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

Preferably the third module,

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

The decoupling part,

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

An energy regulation capacitor for charging and discharging low frequency components of the output signal of the filter unit may be further included.

Preferably the decoupling unit,

Regarding the three-phase external power supply, 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

Regarding single-phase external power, as the third relay switch is controlled to be closed based on a control signal supplied from the outside, an output signal of the filter unit may be transmitted to the energy regulation capacitor.

Preferably, each module,

At least two of the ripple removal inductor, the primary side and the secondary side of the transformer, and the inductor of the noise removal unit may be integrated into a pair of plates made of a magnetic material and provided as one core.

Preferably the core,

It is provided as a pair of plates including a lower plate integrally molded with both side legs and a central leg installed on both sides and in 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, and the primary side and the secondary side of the transformer may be wound on upper sides of both legs of the lower plate.

Preferably the core

Provided as a pair of plates forming a magnetic body including a lower plate integrally molded with both legs, a central leg, and a winding leg between both legs and the central leg, and an upper plate attached to the central leg and connected to the lower plate become,

The inductor of the ripple remover may be wound on lower sides of the winding legs of the lower plate, and the primary and secondary sides of the transformer may be wound on upper sides of the winding legs of the lower plate.

Preferably the core,

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

The ripple remover inductor is wound on the lower side of both legs of the front side of the lower plate, 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 canceling unit is connected to the secondary side of the transformer. An inductor may be wound on both legs of the rear surface of the lower plate, respectively.

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

In addition, as the inductor for removing ripple of the battery charger, the primary side and the secondary side of the transformer, and the inductor for removing noise are integrated into one core, it is possible to realize a lightweight charger.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical idea of the present invention, the present invention is the details described in such drawings should not be construed as limited to
1 is a view showing the core of a general 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 supply of a charger according to an embodiment.
4 is an output waveform diagram of each unit of FIG. 3 .
5 is a conceptual diagram of a single-phase external power supply of a charger according to an embodiment.
6 is an equivalent circuit diagram of a third module of the charger of FIG. 5 .
7 is an output waveform diagram of each unit of FIG. 5
8 is an exemplary view of a core of a charger in one embodiment.
9 is another exemplary view of a core of a charger according to an embodiment.
10 is another exemplary view of a core of a charger according to an embodiment.
11 is another exemplary view 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 clear 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 make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

The 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 from general terms that are currently widely used as much as possible while considering the functions in the present invention, but these may vary depending on the intention of a person skilled in the art or precedent, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the 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, not simply the name of the term.

When it is said that a certain part "includes" a certain component throughout the specification, it means that it may further include other components without excluding other components unless otherwise stated. Also, the term "unit" used in the specification means a hardware component such as software, FPGA or ASIC, and "unit" performs certain roles. However, "unit" is not meant to be limited to software or hardware. A “unit” may be configured to reside in an addressable storage medium and may be configured to reproduce on one or more processors.

Thus, as an example, “unit” refers to components such as software components, object-oriented software components, components and task components, processes, functions, properties, procedures, sub routines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays and variables. Functionality provided within components and "parts" may be combined into fewer components and "parts" or further separated into additional components and "parts".

Prior to the description of this specification, some terms used in this specification will be clarified. In this specification, the high frequency component determined based on the battery capacity (eg 3 kW) of 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, whereby the output voltage and output current , and output signals will be mixed and described.

Here, although having modules of each phase for a three-phase external power source is described as an example, it may be provided with the same number of modules as a multi-phase external power source, and thus the number of phases and modules of the external power source is not limited. .

With reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are 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 three-phase or single-phase external power, single-phase or three-phase AC external power in DC form converted to 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 a 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 supply of the charger of FIG. 2, FIG. 6 is an equivalent circuit diagram of a third module of the charger of FIG. 5, and FIG. 7 is an output waveform diagram of each unit of FIG. .

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

The input terminal of the module (1) (2) (3) of each phase connected to one end of the three-phase external power supply v _ga , v _gb , v _gc is provided with three input ports a, b, c and a neutral point n, and each phase module The output terminal of (1)(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.

In addition, 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 AC power supplied with a phase difference of 120 degrees.

Accordingly, in one embodiment, the second relay switch ( _Relay2 ) and the first relay switch (Relay1) and _the third relay switch (Relay3) and _the capacitor Based on (C _pd ), the center tap of the transformer and the battery are decoupled to convert the external power of each phase into direct current, and then the battery (V _B ) can be charged.

In addition, in one embodiment, for single-phase external power supply v _ga , the first relay switch (Relay1) and the third relay switch (Relay3) controlled to close and the second relay switch (Relay2) controlled to open are applied to the medium voltage step transformer and Decoupling between batteries converts single-phase external power into direct current, 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 source and the second module (2) to supply single-phase AC power to the second module (2).

Meanwhile, the second relay switch (Relay2) is connected between the other end of the external power source and the third module (3) to supply 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. Equipped with a configuration that converts to direct current.

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

The output terminals of the inductors L _g1 and L _g2 are connected to the inverter 120 of the module 1, 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, the third and fourth switching elements S3 and S4, and the fifth and sixth switching elements S5 and S6 respectively perform complementary switching. Here, the connection structure of the plurality of switching elements S1 to S6 is already applied in the battery charger, and the connection structure of the plurality of switching elements S1 to S6 is not specifically specified in this specification, but 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, each rectifying unit 130 is provided with a capacitor C _a , and the rectifying capacitor C _a is the inverter 120 ) is half-wave rectified by clamping the AC (alternating current) component included in the output signal.

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 rectifying capacitor C _a and then to the noise removal unit 142. transmitted, and the noise removal unit 142 removes noise components included in the output signal of the transformer 141. Here, the transformer 141 includes a transformer 141 having a turn ratio of 1:1 and inductors L _s1 and L _s2 of the noise canceling unit 142 connected to one end and the other end of each transformer 141, respectively. As another example, the output signal of the rectifying capacitor C _a may be amplified according to the winding ratio of the primary coil and the secondary coil of the transformer 141 .

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

Here, the AC-DC conversion unit 150 is provided with switching elements S7 to S10, and the seventh and eighth switching elements S7 and S8 and the ninth and tenth switching elements S9 and S10 respectively are controllers (not shown). They are switched complementary to each other based on the switching signal. Here, the switching signal of the controller can apply the switching signal for operating the switching element of each inverter and the switching element of the AC-DC conversion unit by receiving the current and voltage supplied to the battery that is already applied. In this 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 as a capacitor C ₀ connected to, removes the noise component included in the output signal of the AC-DC conversion unit 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 direct current form and transfers it to the battery (V _B ) Ripple control having the same structure as the module 1 It includes a rejection 210, an inverter 220, a rectifier 230, a transformer 241, a noise removal unit 242, an AC-DC conversion unit 250, and a filter unit 260.

The module 3 converts the three-phase external input v _gc received by the closing control of the second relay switch (Relay2) into a direct current form and transfers it to the battery (V _B ). A ripple removal unit having the same structure as the module (1) 310), an inverter 320, a rectifier 330, a transformer 341, a noise removal unit 342, an AC-DC conversion unit 350, and a filter unit 360.

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

In addition, the module 3 has a configuration in which a decoupling operation is performed between the center tap of the transformer and the filter unit 360 based on the third relay switch (Relay3) and the capacitor (C _pd ) controlled to open.

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

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 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 delivered to each module (1) (2) (3), and the output signals of each module (1) (2) (3) are superimposed and the battery (V _B ) is charged. Describing the operation process of the module 1, the ripple component of the external power supply v _ga is removed by the ripple remover 110 and then transferred to the inverter 120. At this time, the external power source v _ga from which the ripple component is removed is a low frequency component.

In addition, the inverter 120 converts the external power v _ga of the low-frequency component from which the ripple has been removed into a high-frequency component, and the converted output signal of the high-frequency component is transmitted to the rectifier 130, whereby 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 transmitted to the primary side of the transformer T1 of the transformer unit 140 of each module 1 and then excited to the secondary side, whereby the output signal of the rectifying unit 130 is transferred to the transformer T1 ) to the inductor for noise removal (L _s1 ) (L _s2 ).

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

The AC-DC conversion unit 150 outputs high-frequency component inductors (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 into direct current form. Here, the output signal of the high-frequency component in the direct current form has a noise component removed based on the capacitor (C _O ) of the filter unit 160, and the output signal of the capacitor (C _O ) of the filter unit 160 is applied to the battery (V _B ). are supplied Although not specifically stated in this specification, modules (2) and (3) operate in the same way as module (1).

In addition, the decoupling unit 351 of the module 3 is connected to the middle step of the secondary side of the transformer 141 and the capacitor C ₀ of the filter unit 360 based on the relay switch (Relay3) controlled to open based on the control signal of the controller. ) 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) You can see the overlap of _oc(DC) . In this case, the charging voltage of the battery may be 240V in a low frequency region and 400 to 800V in a high frequency region.

On the other hand, 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 based on a control signal from a controller (not shown). Accordingly, the single-phase external power v _ga is transmitted to the module 2 via the first relay switch (Relay1), and the modules 1 and 2 receive the single-phase external power v _ga . The high-frequency component is converted into a DC form, and the output signal of each module (1) (2) of each DC form of the high-frequency component is superimposed and transmitted to the battery (V _B ).

Single-phase external power v _{ga silver} It is transmitted to the respective ripple removal units 110 and 210 of the modules 1 and 2, and each ripple removal unit 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 removal unit 110, 210 is transmitted to the inverter 120, 220, respectively, and the inverter 120, 220 has an external power supply v _ga of a low frequency component converted into high-frequency components, external power supply of high-frequency components v _ga is transferred to capacitors C _a and C _b of each rectifier 130 and 230, and is half-wave rectified.

The output signals of the capacitors C _a and C _b of each of the rectifiers 130 and 230 are transferred to the transformers 141 and 241, and each of the transformers 141 and 241 is Output signals of capacitors C _a and C _b are transferred from the primary side to the secondary side of the transformers 141 and 241 to the inductors L _s1 and L _s2 of the noise canceling units 142 and 242, respectively. , so noise components included in the output signal of the transformer are removed.

In addition, the output signal of each transformer 141, 241 of module 1, 2 is converted into direct current based on the AC-DC converter 150, 250 of module 1, 2, and then The output signals of the AC-DC conversion units 150 and 250 of the components are transferred to the filter units 160 and 260, The filter units 160 and 260 remove noise components included in the output signals of the AC-DC converters 150 and 250 of high frequency components, and then convert the output signals i _oa(DC) and i _ob(DC) to a 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 charged 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 middle step, and based on the switching operation of the switching element (S10), the charged voltage of the energy intermittent capacitor (C _pd ) is discharged through the secondary side mid step of the transformer 341 The capacitor C ₀ of the filter unit 360 is charged via this.

This is equivalent to a current source having an in-phase DC with 120 Hz, and the output signal of the modules (1) (2) is i _{oa (DC)} + i _{ob (DC)} , and to the third relay switch (Relay3) controlled to close As the switching elements S4 and S6 of the inverter 320 are shorted, the equivalent impedance becomes 0, and the transformer 341 is deactivated. Therefore, the AC-DC conversion unit 350 of module 3 is a two-phase interleaved buck converter is equivalent to

Therefore, 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 and 2. Meanwhile, the charging voltage of the filter unit 360 of the low frequency component is removed based on the capacitor C _pd for energy regulation.

In the case of single-phase external power v _gc , based on the interleaved operation of the secondary inductors (L _s1 , L _s2 ) of the transformer 341 of the module (3), the capacitor C _pd and the 7th to 10th switching elements (S7 to S10) The current rating of capacitor C _pd may be reduced.

In addition, efficiency can be maximized as the 7th to 10th switching elements (S7 to S10) perform zero voltage switching (ZVS) in the high-frequency switching operation, and as a result, the current of 120Hz is removed in 3kW operation, so that the DC component of the battery charging is possible

Accordingly, one embodiment implements a charger with a single-phase and three-phase AC-DC converter with a single-phase structure without an electrolytic capacitor that reduces reliability and charging efficiency, so that it is compatible with single-phase and three-phase external power sources, and the number of elements is This reduces the charging efficiency and the performance, reliability and lifetime of a wide input/output voltage range can be improved.

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

8 to 11 are the inductors Lg1 and Lg2 of the ripple remover 110 of the module 1 and the primary and secondary sides of the transformer 141 of the transformer 140 and the noise remover 142. These diagrams show the configuration of an integrated core including an inductor (L _s1 ) (L _s2 ).

Referring to FIG. 8, an example of the core is attached to a lower plate 510a integrally molded with three legs, such as both side legs 501a and 501b and the center leg 503, and the center leg 503 and includes an upper plate 510b connected to the lower plate 510a.

In addition, the inductors (L _g1 ) (L _g2 ) of the ripple removal unit 110 are 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. 501b are wound on the bottom surface, respectively. Accordingly, the inductor (L _g1 ) (L _g2 ) of the ripple remover 110 and the primary side and the secondary side of the transformer 141 may be implemented by an 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 element 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, one end and the other end of the secondary winding of the transformer are connected in series to the inductor L _s1 and the inductor L _s2 through nodes c and d, and both legs 501a and 501b of the lower plate 510a An air gap 510c may be formed in at least one of the central leg 503 and the air gap to control inductance and prevent magnetic flux saturation of the upper and lower plates 510a and 510b of the magnetic material.

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

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

In addition, the inductor (L _g1 ) (L _g2 ) of the ripple remover 110 is wound on the lower side of the winding leg winding legs 535a and 535b of the lower plate 530a, respectively, and the primary side 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, the winding leg 535a An air gap 530c is formed in at least one of the 535b, and the air gap 530c controls inductance and prevents magnetic flux saturation of the upper and lower plates 530a and 530b of the magnetic material.

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

As the 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, inductance control and magnetic material Magnetic flux saturation of the upper and lower plates 530a and 530b is prevented.

In addition, the inductor (L _g1 ) (L _g2 ) of the ripple removal unit 110 is wound on the lower side of the legs 551a and 551b on both sides of the front side of the lower plate 550a, respectively, and the primary side and the secondary side of the transformer 141 The inductors (L _s1 ) (L _s2 ) of the noise canceling unit 142 wound on the upper side of the legs 551a and 551b on both front sides of the lower plate 550a and connected to the secondary side of the transformer are 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 element S4 through nodes a and o, and the other end of the primary winding of the transformer 141 is connected to the 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, one end c and the other end d, respectively, of the secondary winding of the transformer 141 are shorted in series to the inductor L _s1 and the inductor L _s2 through nodes e and f, so that the inductor of the ripple removal unit 110 ( L _g1 )(L _g2 ), the transformer 141 and the inductor L _s1 (L _s2 ) of the noise canceling unit 142 are integrated into one core.

Referring to FIG. 11 , in another example, the core has both side legs 571a and 571b, a center leg 573, and a front winding leg 575a and 575b between both 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.

In addition, the inductors (L _g1 ) (L _g2 ) of the ripple remover 110 are wound on the lower side of the front winding legs 575a and 575b of the lower plate 570a, respectively, and 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), an air gap 570c is formed in at least one of the center leg 573, the front winding legs 575a, 575b, and the rear winding legs 575c, 575d, and the air gap 570c reduces the inductance. Magnetic flux saturation of the upper and lower plates 570a and 570b of the regulating and magnetic body is prevented.

One embodiment can obtain the advantage of being applicable to a lightweight charger in terms of price and volume based on one integrated core.

The present invention has been described with reference to the embodiments shown in the drawings, but this is only exemplary, and those skilled in the art can make various modifications and equivalent other embodiments. will understand Therefore, the technical protection scope of the present invention should be defined by the claims below.

By realizing a battery charger with a single-phase and three-phase single-phase structure without an electrolytic capacitor that deteriorates reliability and charging efficiency, it is compatible with single-phase and three-phase external power supplies, and the number of switching elements reduced and the soft switching operation of the switching elements It can improve charging efficiency and performance of a wide input/output voltage range, improve reliability and lifespan, and at least two of the ripple removal inductor of the battery charger, the primary side and secondary side of the transformer, and the inductor for noise removal can be combined into one By integrating it into a core, it can bring about great progress in terms of operational accuracy and reliability, furthermore, performance efficiency, for three-phase and single-phase combined chargers that can implement lightweight chargers, and the possibility of commercialization or sales of electric vehicle chargers. It is an invention with industrial applicability because it is not only sufficient but also to the extent that it can be clearly implemented in practice.

Claims (10)

delete delete delete First to third modules for converting each of the three-phase external power sources into a high-voltage direct current form and then charging the battery;
A first relay switch for transferring the single-phase external power to the second module with respect to the single-phase external power; and
For single-phase external power, further comprising a second relay switch that blocks transmission of the single-phase external power to the third module,
Each of the above modules,
a ripple removal unit provided as an inductor connected in parallel to one end of the external power supplied 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 removal units to convert low-frequency external power to high-frequency alternating current;
a capacitor for half-wave rectifying the AC component of the output signal of the inverter;
a transformer connected to an output terminal of the capacitor and passing an output signal of the capacitor;
a noise removal unit provided with inductors connected to one end and the other end of the secondary side of the transformer to remove noise components included in the secondary side output signal of the transformer;
an AC-DC conversion unit connected to the output terminal of each inductor of the noise removal unit and converting the output signal of the inductor into a direct current form; and
A filter unit provided with a capacitor connected between one end and the other end of the AC-DC conversion unit to remove noise components included in the output signal of the AC-DC conversion unit and then charge the output signal of the high-frequency component to a battery,
The third module,
Further comprising a decoupling unit for regulating the output signal of the filter unit,
The decoupling part,
a third relay switch connected in series to the middle step of the secondary side of the transformer and decoupling the secondary side output terminal of the transformer and the battery; and
Three-phase and single-phase combination charger, characterized in that it further comprises an energy regulation capacitor for charging and discharging the low-frequency component of the output signal of the filter unit. The method of claim 4, wherein the decoupling unit,
For a 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. Charger for both three-phase and single-phase. The method of claim 4, wherein the decoupling unit
Regarding single-phase external power, as the third relay switch is controlled to close based on the control signal supplied from the outside, the output signal of the filter unit is transmitted to the energy regulation capacitor. Charger for both three-phase and single-phase . The method of claim 4, wherein each module,
Three-phase and single-phase combined use, characterized in that at least two of the inductor of the ripple removal unit, the primary side and the secondary side of the transformer, and the noise removal unit inductor are integrated into a pair of plates made of a magnetic material and provided as one core. charger. The method of claim 7, wherein the core,
It is provided as a pair of plates including a lower plate integrally molded with both side legs and a central leg installed on both sides and in 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 removal unit is wound on the lower side of both legs of the lower plate, and the primary side and the secondary side of the transformer are wound on the upper side of both legs of the lower plate. . The method of claim 7, wherein the core
Provided as a pair of plates forming a magnetic body including a lower plate integrally molded with both legs, a central leg, and a winding leg between both legs and the central leg, and an upper plate attached to the central leg and connected to the lower plate become,
The inductor of the ripple removal unit is 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 are wound on the upper side of the winding leg of the lower plate. . The method of claim 7, wherein the core,
It is provided as a pair of plates including a lower plate integrally molded with both front legs, both rear legs, and one central leg 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, 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 suppressor is connected to the secondary side of the transformer. A charger for both three-phase and single-phase, characterized in that the inductor of the rejection is wound on both legs of the rear surface of the lower plate, respectively.

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