WO2017073829A1 - Bidirectional non-isolated dc-dc converter having improved stability - Google Patents

Bidirectional non-isolated dc-dc converter having improved stability Download PDF

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Publication number
WO2017073829A1
WO2017073829A1 PCT/KR2015/011995 KR2015011995W WO2017073829A1 WO 2017073829 A1 WO2017073829 A1 WO 2017073829A1 KR 2015011995 W KR2015011995 W KR 2015011995W WO 2017073829 A1 WO2017073829 A1 WO 2017073829A1
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switch
converter
high voltage
low voltage
protection
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PCT/KR2015/011995
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French (fr)
Korean (ko)
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장민규
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엘에스오토모디브 주식회사
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Publication of WO2017073829A1 publication Critical patent/WO2017073829A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

Definitions

  • the present invention relates to a bidirectional non-isolated DC-DC converter, and more particularly to a bidirectional non-isolated DC-DC converter with improved stability.
  • the bidirectional DC-DC converter is controlled in accordance with a command signal, and operates in a boost mode or a buck mode.
  • Korean Patent Publication No. 10-2010-0115087 discloses a bidirectional DC-DC converter and a control method thereof.
  • FIG. 1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter 100 incorporating a protection circuit.
  • a first back-to-back switch 10 is connected to a 48V stage, and the second back-to-back switch 20 is 12V or 24V. In connection with the stage, it protects the non-isolated bidirectional DC-DC converter 100 from short circuit and reverse polarity.
  • the back-to-back switch (10, 20) is a two switches are put together to protect the non-isolated bi-directional DC-DC converter and other accessories from overvoltage or overcurrent, noise signal, reverse polarity input in both directions do.
  • each of the first back-to-back switch 10 connected to the 48V high voltage, the second back-to-back switch 20 connected to the 12V or 24V low voltage has a short circuit of 48V, a short circuit of 12V / 24V, an electrical transient, and the like. To protect.
  • Each of the back-to-back switches 10 and 20 is turned on or off according to the back-to-back switch signal. That is, each of the back-to-back switches 10 and 20 is turned on by receiving a switching signal indicating turn-on when the non-isolated bidirectional DC-DC converter 100 is driven.
  • the conventional non-isolated bidirectional DC-DC converter 100 is provided with gate power sources V g1 and V g2 , which are separate power sources for the operations of the respective back-to-back switches 10 and 20. That is, the conventional back-to-back switches 10 and 20 receive gate power through separate gate power supplies V g1 and V g2 having different reference potentials.
  • the conventional non-isolated bidirectional DC-DC converter 100 having a built-in protection circuit is provided with a pair of back-to-back switches 10 and 20. That is, the first back-to-back switch 10 connected to the high voltage and the second back-to-back switch 20 connected to the low voltage should be installed in the non-isolated bidirectional DC-DC converter 100.
  • the structure of connecting the pair of back-to-back switches 10 and 20 to the non-isolated bidirectional DC-DC converter 100 not only causes cost problems, but also has a problem against the trend of miniaturizing electronic products.
  • the conventional protection circuit structure since a total of four switches (Q 3 , Q 4 , Q 5 , Q 6 ) are additionally installed in the non-isolated bidirectional DC-DC converter 100, each switch Q 3 , Additional losses in Q 4 , Q 5 and Q 6 ) occur, resulting in a decrease in converter efficiency.
  • two gate power sources Vg1 and Vg2 must be additionally installed, which causes a problem in that the product becomes larger.
  • the present invention has been proposed to solve such a conventional problem, and an object thereof is to provide a bidirectional non-isolated DC-DC converter having low manufacturing cost, easy to miniaturization, and improved stability.
  • a non-isolated bidirectional DC-DC converter including a protection switch performing a bidirectional voltage conversion between a high voltage power supply and a low voltage power supply, the boost mode or buck in response to a switching signal
  • a DC-DC converter unit including a high voltage switch and a low voltage switch, the inductor connected to the high voltage switch and the low voltage switch;
  • a first protection switch disposed between the inductor and the high voltage switch of the DC-DC converter unit to perform a back-to-back switch function together with the high voltage switch;
  • a second protection switch disposed between a node formed between a line between the first protection switch and the high voltage switch and the low voltage switch to perform a back-to-back switch function together with the low voltage switch.
  • the first protection switch and the high voltage switch may operate as a back-to-back switch to block abnormal current generated between the high voltage power supply and the low voltage power supply.
  • the second protection switch and the low voltage switch may operate as a back-to-back switch to block abnormal current generated between the high voltage power source or the low voltage power source and the ground grounded in the low voltage switch.
  • the switch may be a semiconductor switch.
  • the source of the first protection switch is connected to the node, and the drain of the first protection switch is connected to the inductor.
  • the source of the second protection switch is connected to the node, the drain of the second protection switch is connected to the drain of the low voltage switch.
  • power is supplied to the gate of the high voltage switch, the gate of the first protection switch, and the gate of the second protection switch through one gate power source.
  • the non-isolated bidirectional DC-DC converter according to the present invention has the advantage of reducing the number of switches used to protect the system compared to the conventional non-isolated bidirectional DC-DC converter, thereby reducing the cost of the converter and miniaturizing the product.
  • non-isolated bidirectional DC-DC converter by reducing the number of switches used to protect the system, the effect of minimizing the system loss occurring in proportion to the number of switches and improve the efficiency of the converter There is also.
  • the non-isolated bidirectional DC-DC converter according to the present invention has the advantage of further miniaturizing the product by supplying power to three switches using one gate power supply, thereby reducing the number of gate power supplies.
  • FIG. 1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter with a built-in protection circuit.
  • FIG. 2 is a diagram illustrating a non-isolated bidirectional DC-DC converter having improved stability according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a non-isolated bidirectional DC-DC converter 200 having improved stability according to an embodiment of the present invention.
  • the non-isolated bidirectional DC-DC converter 200 having improved stability includes a high voltage power supply 210, a low voltage power supply 220, a capacitor 240, and a DC-DC.
  • the converter unit 230 and the plurality of protection switches 251 and 252 are included.
  • the high voltage power supply 210 is a power supply device having a higher voltage than the low voltage power supply 220 and capable of charging and discharging.
  • a 48V battery may be adopted, and an ultracapacitor may be adopted.
  • the high voltage power supply 210 is electrically connected to the DC-DC converter unit 230 to supply power to a load device using a high voltage or low voltage power supply 220. Charge it.
  • the low voltage power supply 220 may have a lower voltage than the high voltage power supply 210 and may be charged or discharged. A 12V battery or a 24V battery may be adopted. When the non-isolated bidirectional DC-DC converter 200 is driven, the low voltage power supply 220 applies power to the load device using the low voltage or charges the high voltage power 210.
  • the capacitor 240 is connected in parallel to the low voltage power supply 220, an output smoothing capacitor may be used.
  • the DC-DC converter unit 230 operates in a boost mode or a buck mode according to the switching signal. That is, the DC-DC converter unit 230 operates in a boost mode for moving the current of the low voltage power supply 220 to the high voltage power supply 210 by the switching signal, or converts the current of the high voltage power supply 210 to the low voltage power supply 220. It works in buck mode.
  • the DC-DC converter unit 230 includes an inductor 233 that accumulates energy when a current flows, and a pair of switches 231 and 232 that complementarily operate with each other.
  • the pair of switches 231 and 232 (Q c and Q d ) included in the DC-DC converter unit 230 are divided into a high voltage switch 231 (Q c ) and a low voltage switch 232 (Q d ).
  • Each switch 231 and 232 is turned on or turned off according to the switching signals S 3 and S 4 .
  • Each switch 231, 232, 251, and 252 is turned on or off based on a pulse width modulation (PWM) which is a switching signal generated by a switch control module (not shown in the figure).
  • PWM pulse width modulation
  • the low voltage switch 232 (Q d ) and the high voltage switch 231 (Q c ) operate complementary to each other.
  • the low voltage switch 232 When the current is moved from the low voltage power supply 220 to the high voltage power supply 210, the low voltage switch 232 (Q d ) operates as the main switch, and conversely, the current moves from the high voltage power supply 210 to the low voltage power supply 220. Is turned on, the high voltage switch 231 (Q c ) acts as the main switch.
  • each switch 231, 232, 251, and 252 may use a metal oxide semiconductor field effect (MOSFET) switch as a semiconductor switch.
  • MOSFET metal oxide semiconductor field effect
  • the low voltage switch 232 (Q d ) may be grounded.
  • a first node N 1 which is a branching point, is formed on a line on the inductor 233 and the high voltage switch 231 (Q c ), and the cathode of the high voltage power supply 210 and the cathode of the low voltage power supply 220 are connected to each other.
  • the second node N 2 which is a branch point, is formed on the track.
  • a drain of the high voltage switch 231 (Q c ) is connected to the positive electrode of the high voltage power supply 210, and a source of the high voltage switch 231 (Q c ) is connected to the first node N 1 .
  • the source of low-voltage switch (232) (Q d) to the second drain node connected to the (N2) and the low-voltage switch (232) (Q d) is connected to the drain of the second protection switch (252) (Q b) do.
  • Power is supplied to the gates of the high voltage switch 231 (Q c ), the first protection switch 251 (Q a ), and the second protection switch 252 (Q b ) through one gate power supply V g . do.
  • the high voltage switch 231 (Q c ), the first protection switch 251 (Q a ), and the second protection through one gate power supply V g
  • the gate power can be supplied to the switch 252 (Q b ).
  • the gate voltage may be supplied to the low voltage switch 232 (Q d ) through a separate gate power (not shown).
  • a first protection switch 251 Q a is disposed between the inductor 233 and the first node N 1 to back-to-back.
  • a second protection switch 252 (Q b ) is disposed between the low voltage switch 232 (Q d ) and the first node N 1 to perform the function of a back-to-back switch. Perform the function.
  • the drain of the first protection switch 251 (Q a ) is connected in series with the inductor 233, and the source of the first protection switch 251 (Q a ) is connected with the first node N 1 .
  • the high voltage switch 231 (Q c ) and the first protection switch 251 (Q a ) between the high voltage power supply 210 and the low voltage power supply 220 perform a function of a back-to-back switch. Blocks abnormal current flow caused by a short circuit between the high voltage power supply 210 and the low voltage power supply 220, and blocks reverse polarity current that may occur due to a miswiring.
  • the drain of the second protection switch 252 (Q b ) is connected to the drain of the low voltage switch 232 (Q d ), and the source of the second protection switch 252 (Q b ) is the first node N1.
  • the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ) function as a back-to-back switch between the power supplies 210 and 220 and ground (GND) according to the connection structure. Do this. That is, the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ) are generated due to a short between the high voltage power source 210 or the low voltage power source 220 and the ground GND. This protects the system from short circuit and reverse polarity by blocking abnormal current flow and blocking the reverse polarity current caused by incorrect wiring.
  • the switching signals S 1 and S 2 which turn on the first protection switch 251 (Q a ) and the second protection switch 252 (Q b ).
  • the switching control module (not shown in the figure).
  • a switching signal for turning on any one of the high voltage switch 231 (Q c ) and the low voltage switch 232 (Q d ) may be generated in the switching control module. That is, when the non-isolated bidirectional DC-DC converter 200 is driven, the switch control module supplies a switching signal for turning on both the first protection switch 251 (Q a ) and the second protection switch 252 (Q b ).
  • a signal for turning on any one of the high voltage switch 231 (Q c ) and the low voltage switch 232 (Q d ) based on the operation mode ie, the boost mode or the buck mode
  • the operation mode ie, the boost mode or the buck mode
  • the non-isolated bidirectional DC-DC converter 200 including the protection switches 251 and 252 is connected to the high voltage power supply 210 through the first protection switch 251 (Q a ) and the high voltage switch 252 (Q c ). It is possible to block unintended abnormal currents (eg, reverse polarity currents, transients, etc.) that may occur between and the low voltage power supply 220.
  • unintended abnormal currents eg, reverse polarity currents, transients, etc.
  • the unintended current flow occurring between the high voltage power source 210 or the low voltage power source 220 and the ground GND may include the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ). It is blocked through.
  • the non-isolated bidirectional DC-DC converter 200 including the protection switch As described above, in the non-isolated bidirectional DC-DC converter 200 including the protection switch according to the embodiment of the present invention, the number of switches is reduced compared to the conventional non-isolated bidirectional DC-DC converter 100, thereby reducing the cost. In addition, the non-isolated bidirectional DC-DC converter 200 according to the embodiment of the present invention reduces the number of switches compared to the conventional non-isolated bidirectional DC-DC converter 100. Accordingly, the efficiency of the converter is improved by minimizing the system loss occurring in proportion to the number of each switch. In addition, the non-isolated bidirectional DC-DC converter 200 according to the embodiment of the present invention supplies power to the three switches 231, 251, and 252 using one gate power supply V g to provide the power supply. By reducing the number, it is very suitable for product miniaturization.
  • the non-isolated bidirectional DC-DC converter 200 has been described as including a single DC-DC converter unit 230, but the present invention is not limited thereto, and the plurality of DC-DC converters is described. It is clear that the present invention can be applied to a multiphase non-isolated bidirectional DC-DC converter including the unit 230.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention relates to a bidirectional non-isolated DC-DC converter having improved stability. The bidirectional non-isolated DC-DC converter according to one embodiment of the present invention comprises: a DC-DC converter unit including a high-voltage switch and a low-voltage switch, which are a pair of switching elements for switching to a boost mode or a buck mode in response to a switching signal, and an inductor connected to the high-voltage switch and the low-voltage switch; a first protection switch disposed between the inductor and the high-voltage switch of the DC-DC converter unit so as to perform a back-to-back switch function with the high-voltage switch; and a second protection switch disposed between the low-voltage switch and a node formed on a line between the first protection switch and the high-voltage switch so as to perform the back-to-back switch function with the low-voltage switch.

Description

안정성이 향상된 양방향 비절연 DC-DC 컨버터Reliable, Bidirectional Non-Isolated DC-DC Converters
본 발명은 양방향 비절연 DC-DC 컨버터에 관한 것으로서, 더욱 상세하게는 안정성이 향상된 양방향 비절연 DC-DC 컨버터에 관한 것이다.The present invention relates to a bidirectional non-isolated DC-DC converter, and more particularly to a bidirectional non-isolated DC-DC converter with improved stability.
본 발명은 2015년 10월 30일에 출원된 한국특허출원 제10-2015-0152152호에 기초한 우선권을 주장하며, 해당 출원의 명세서 및 도면에 개시된 모든 내용은 본 출원에 원용된다.The present invention claims priority based on Korean Patent Application No. 10-2015-0152152 filed on October 30, 2015, and all the contents disclosed in the specification and drawings of the application are incorporated in this application.
최근 차량용 48V 시스템이 보급됨에 따라, 기존의 12V(또는 24V) 시스템과 48V 시스템의 전기 흐름을 제어하기 위한, 양방향 DC-DC 컨버터의 필요성이 대두되었다. 상기 양방향 DC-DC 컨버터는 지령 신호에 따라 스위치가 제어되어, 부스트 모드(boost mode) 또는 벅 모드(buck mode)로 동작한다. 한국공개특허 제10-2010-0115087호는 양방향 DC-DC 컨버터 및 그의 제어방법에 대해서 개시한다.With the recent popularization of automotive 48V systems, the need for bidirectional DC-DC converters to control the electrical flow of existing 12V (or 24V) and 48V systems has emerged. The bidirectional DC-DC converter is controlled in accordance with a command signal, and operates in a boost mode or a buck mode. Korean Patent Publication No. 10-2010-0115087 discloses a bidirectional DC-DC converter and a control method thereof.
한편, 12V(또는 24V) 단과 48V 단의 단락 및 역극성으로부터 컨버터 시스템을 보호하는 DC-DC 컨버터가 개시되었다. On the other hand, a DC-DC converter has been disclosed that protects the converter system from short-circuits and reverse polarity in the 12V (or 24V) and 48V stages.
도 1은 보호 회로가 내장된 종래의 비절연 양방향 DC-DC 컨버터(100)를 나타내는 도면이다. 1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter 100 incorporating a protection circuit.
도 1을 참조하면, 종래의 비절연 양방향 DC-DC 컨버터(100)에는 제1 백투백(back-to-back) 스위치(10)가 48V 단과 연결되고, 제2 백투백 스위치(20)가 12V 또는 24V 단과 연결되어, 단락 및 역극성으로부터 비절연 양방향 DC-DC 컨버터(100)를 보호한다. Referring to FIG. 1, in the conventional non-isolated bidirectional DC-DC converter 100, a first back-to-back switch 10 is connected to a 48V stage, and the second back-to-back switch 20 is 12V or 24V. In connection with the stage, it protects the non-isolated bidirectional DC-DC converter 100 from short circuit and reverse polarity.
상기 백투백 스위치(10, 20)는 두 개의 스위치가 맞붙여 배치된 것으로서, 양방향으로 입력되는 과전압 또는 과전류, 잡음 신호, 역극성으로부터 비절연 양방향 DC-DC 컨버터 및 그 외의 부속품을 보호하는 기능을 수행한다. 즉, 48V 고전압과 연결된 제1 백투백 스위치(10), 12V 또는 24V 저전압에 연결된 제2 백투백 스위치(20) 각각은 48V의 단락, 12V/24V의 단락, 전기적 과도 현상 등으로부터 내부 회로와 그 외의 부속품을 보호한다.The back-to-back switch (10, 20) is a two switches are put together to protect the non-isolated bi-directional DC-DC converter and other accessories from overvoltage or overcurrent, noise signal, reverse polarity input in both directions do. In other words, each of the first back-to-back switch 10 connected to the 48V high voltage, the second back-to-back switch 20 connected to the 12V or 24V low voltage has a short circuit of 48V, a short circuit of 12V / 24V, an electrical transient, and the like. To protect.
각각 백투백 스위치(10, 20)는 백투백 스위치 신호에 따라 턴온(turn on)되거나 턴오프(turn off)된다. 즉, 각 백투백 스위치(10, 20)는 비절연 양방향 DC-DC 컨버터(100)가 구동되는 경우에, 턴온을 지시하는 스위칭 신호를 인가받아 턴온된다. Each of the back-to- back switches 10 and 20 is turned on or off according to the back-to-back switch signal. That is, each of the back-to- back switches 10 and 20 is turned on by receiving a switching signal indicating turn-on when the non-isolated bidirectional DC-DC converter 100 is driven.
또한, 종래의 비절연 양방향 DC-DC 컨버터(100)에는 각각의 백투백 스위치(10, 20)의 동작을 위한 별도의 전원인 게이트 전원(Vg1, Vg2)이 구비된다. 즉, 종래의 백투백 스위치(10, 20)는 기준 전위가 상위하여 서로 다른 별도의 게이트 전원(Vg1, Vg2)을 통해서, 게이트 전원을 공급받는다.In addition, the conventional non-isolated bidirectional DC-DC converter 100 is provided with gate power sources V g1 and V g2 , which are separate power sources for the operations of the respective back-to- back switches 10 and 20. That is, the conventional back-to- back switches 10 and 20 receive gate power through separate gate power supplies V g1 and V g2 having different reference potentials.
상술한 바와 같이, 보호 회로가 내장된 종래의 비절연 양방향 DC-DC 컨버터(100)에는 한 쌍의 백투백 스위치(10, 20)가 구비된다. 즉, 고전압과 연결되는 제1백투백 스위치(10), 및 저전압과 연결되는 제2백투백 스위치(20)가 비절연 양방향 DC-DC 컨버터(100)에 설치되어야 한다. As described above, the conventional non-isolated bidirectional DC-DC converter 100 having a built-in protection circuit is provided with a pair of back-to- back switches 10 and 20. That is, the first back-to-back switch 10 connected to the high voltage and the second back-to-back switch 20 connected to the low voltage should be installed in the non-isolated bidirectional DC-DC converter 100.
그런데 이러한 한 쌍의 백투백 스위치(10, 20)를 비절연 양방향 DC-DC 컨버터(100)에 연결시키는 구조는, 비용상의 문제점을 야기할 뿐만 아니라, 전자제품을 소형화시키는 추세에 반하는 문제점이 있다. 또한, 종래의 보호 회로 구조는, 총 4개의 스위치(Q3, Q4, Q5, Q6)가 비절연 양방향 DC-DC 컨버터(100)에 추가로 설치됨으로 인하여, 각 스위치(Q3, Q4, Q5, Q6)에서의 추가적인 손실이 발생하여, 이로 인해 컨버터 효율이 저하되는 문제점도 있다. 게다가, 종래의 백투백 스위치(10, 20)로 게이트 전원을 공급하기 위하여, 2개의 게이트 전원(Vg1, Vg2)을 추가 설치하여야 되기 때문에, 제품이 대형화되는 문제점도 있다.However, the structure of connecting the pair of back-to- back switches 10 and 20 to the non-isolated bidirectional DC-DC converter 100 not only causes cost problems, but also has a problem against the trend of miniaturizing electronic products. In addition, the conventional protection circuit structure, since a total of four switches (Q 3 , Q 4 , Q 5 , Q 6 ) are additionally installed in the non-isolated bidirectional DC-DC converter 100, each switch Q 3 , Additional losses in Q 4 , Q 5 and Q 6 ) occur, resulting in a decrease in converter efficiency. In addition, in order to supply the gate power to the conventional back-to- back switches 10 and 20, two gate power sources Vg1 and Vg2 must be additionally installed, which causes a problem in that the product becomes larger.
본 발명은 이러한 종래의 문제점을 해결하기 위하여 제안된 것으로, 제조단가가 저렴하고 소형화에 용이하며 안정성이 향상된 양방향 비절연 DC-DC 컨버터를 제공하는데 그 목적이 있다. The present invention has been proposed to solve such a conventional problem, and an object thereof is to provide a bidirectional non-isolated DC-DC converter having low manufacturing cost, easy to miniaturization, and improved stability.
본 발명의 다른 목적 및 장점들은 하기의 설명에 의해서 이해될 수 있으며, 본 발명의 실시예에 의해 보다 분명하게 알게 될 것이다. 또한, 본 발명의 목적 및 장점들은 특허 청구 범위에 나타낸 수단 및 그 조합에 의해 실현될 수 있음을 쉽게 알 수 있을 것이다.Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.
상기 목적을 달성하기 위한 본 발명의 일 측면에 따른, 고전압 전원과 저전압 전원 사이에서 양방향 전압 변환을 수행하며 보호 스위치를 포함하는 비절연 양방향 DC-DC 컨버터는, 스위칭 신호에 응답하여 부스트 모드 또는 벅 모드로 스위칭되는 한 쌍의 스위칭 소자인 고전압 스위치와 저전압 스위치, 상기 고전압 스위치와 상기 저전압 스위치와 연결되는 인덕터를 포함하는 DC-DC 컨버터 유닛; 상기 DC-DC 컨버터 유닛의 인덕터와 고전압 스위치 사이에 배치되어 상기 고전압 스위치와 함께 백투백(back-to-back) 스위치 기능을 수행하는 제1 보호 스위치; 및 상기 제1 보호 스위치와 상기 고전압 스위치 간의 선로 간에 형성된 노드와 상기 저전압 스위치 사이에 배치되어 상기 저전압 스위치와 함께 백투백 스위치 기능을 수행하는 제2 보호 스위치를 포함하는 것을 특징으로 한다.According to an aspect of the present invention for achieving the above object, a non-isolated bidirectional DC-DC converter including a protection switch performing a bidirectional voltage conversion between a high voltage power supply and a low voltage power supply, the boost mode or buck in response to a switching signal A DC-DC converter unit including a high voltage switch and a low voltage switch, the inductor connected to the high voltage switch and the low voltage switch; A first protection switch disposed between the inductor and the high voltage switch of the DC-DC converter unit to perform a back-to-back switch function together with the high voltage switch; And a second protection switch disposed between a node formed between a line between the first protection switch and the high voltage switch and the low voltage switch to perform a back-to-back switch function together with the low voltage switch.
상기 제1 보호 스위치와 상기 고전압 스위치는 백투백 스위치로 동작하여 상기 고전압 전원과 상기 저전압 전원 사이에서 발생하는 비정상적인 전류를 차단할 수 있다.The first protection switch and the high voltage switch may operate as a back-to-back switch to block abnormal current generated between the high voltage power supply and the low voltage power supply.
또한, 상기 제2 보호 스위치와 상기 저전압 스위치는 백투백 스위치로 동작하여, 상기 고전압 전원 또는 상기 저전압 전원과 상기 저전압 스위치에서 접지된 그라운드 사이에서 발생하는 비정상적인 전류를 차단할 수 있다.In addition, the second protection switch and the low voltage switch may operate as a back-to-back switch to block abnormal current generated between the high voltage power source or the low voltage power source and the ground grounded in the low voltage switch.
상기 스위치는, 반도체 스위치일 수 있다. 이 경우 상기 제1 보호 스위치의 소스가 상기 노드와 연결되고, 상기 제1 보호 스위치의 드레인이 상기 인덕터와 연결된다. 또한, 상기 제2 보호 스위치의 소스가 상기 노드와 연결되고, 상기 제2 보호 스위치의 드레인이 상기 저전압 스위치의 드레인과 연결된다.The switch may be a semiconductor switch. In this case, the source of the first protection switch is connected to the node, and the drain of the first protection switch is connected to the inductor. In addition, the source of the second protection switch is connected to the node, the drain of the second protection switch is connected to the drain of the low voltage switch.
또한, 하나의 게이트 전원을 통해서, 상기 고전압 스위치의 게이트, 상기 제1 보호 스위치의 게이트 및 상기 제2 보호 스위치의 게이트에 전원이 공급된다.In addition, power is supplied to the gate of the high voltage switch, the gate of the first protection switch, and the gate of the second protection switch through one gate power source.
본 발명에 따른 비절연 양방향 DC-DC 컨버터는, 시스템을 보호하는데 이용하는 스위치의 개수를 종래의 비절연 양방향 DC-DC 컨버터보다 감소시켜, 컨버터의 원가를 절감시키고 제품의 소형화시키는 장점이 있다.The non-isolated bidirectional DC-DC converter according to the present invention has the advantage of reducing the number of switches used to protect the system compared to the conventional non-isolated bidirectional DC-DC converter, thereby reducing the cost of the converter and miniaturizing the product.
또한, 본 발명에 따른 비절연 양방향 DC-DC 컨버터는, 시스템을 보호하는데 이용되는 스위치의 개수를 감소시킴에 따라, 스위치의 개수에 비례하여 발생하는 시스템 손실을 최소화하고 컨버터의 효율이 향상시키는 효과도 있다.In addition, the non-isolated bidirectional DC-DC converter according to the present invention, by reducing the number of switches used to protect the system, the effect of minimizing the system loss occurring in proportion to the number of switches and improve the efficiency of the converter There is also.
게다가, 본 발명에 따른 비절연 양방향 DC-DC 컨버터는, 하나의 게이트 전원을 이용하여 세 개의 스위치로 전원을 공급하여 게이트 전원의 개수를 줄임으로써, 제품 소형화를 더욱 용이하게 하는 이점이 있다.In addition, the non-isolated bidirectional DC-DC converter according to the present invention has the advantage of further miniaturizing the product by supplying power to three switches using one gate power supply, thereby reducing the number of gate power supplies.
본 명세서에 첨부되는 다음의 도면들은 본 발명의 바람직한 실시예를 예시하는 것이며, 발명을 실시하기 위한 구체적인 내용과 함께 본 발명의 기술사상을 더욱 이해시키는 역할을 하는 것이므로, 본 발명은 그러한 도면에 기재된 사항에만 한정되어 해석되어서는 아니 된다.The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the specific details for carrying out the invention serve to further understand the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to matters.
도 1은 보호 회로가 내장된 종래의 비절연 양방향 DC-DC 컨버터를 나타내는 도면이다. 1 is a diagram illustrating a conventional non-isolated bidirectional DC-DC converter with a built-in protection circuit.
도 2는 본 발명의 일 실시예에 따른, 안정성이 향상된 비절연 양방향 DC-DC 컨버터를 나타내는 도면이다.2 is a diagram illustrating a non-isolated bidirectional DC-DC converter having improved stability according to an embodiment of the present invention.
상술한 목적, 특징 및 장점은 첨부된 도면과 관련한 다음의 상세한 설명을 통하여 보다 분명해 질 것이며, 그에 따라 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 용이하게 실시할 수 있을 것이다. 또한, 본 발명을 설명함에 있어서 본 발명과 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 경우에 그 상세한 설명을 생략하기로 한다. 이하, 첨부된 도면을 참조하여 본 발명에 따른 바람직한 일 실시예를 상세히 설명하기로 한다.The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 2는 본 발명의 일 실시예에 따른, 안정성이 향상된 비절연 양방향 DC-DC 컨버터(200)를 나타내는 도면이다.2 is a diagram illustrating a non-isolated bidirectional DC-DC converter 200 having improved stability according to an embodiment of the present invention.
도 2에 도시된 바와 같이, 본 발명의 일 실시예에 따른 안정성이 향상된 비절연 양방향 DC-DC 컨버터(200)는 고전압 전원(210), 저전압 전원(220), 커패시터(240), DC-DC 컨버터 유닛(230) 및 복수의 보호 스위치(251, 252)를 포함한다.As shown in FIG. 2, the non-isolated bidirectional DC-DC converter 200 having improved stability according to an embodiment of the present invention includes a high voltage power supply 210, a low voltage power supply 220, a capacitor 240, and a DC-DC. The converter unit 230 and the plurality of protection switches 251 and 252 are included.
고전압 전원(210)은 저전압 전원(220)보다 높은 전압을 가지며 충방전이 가능한 전원 장치로서, 48V 배터리가 채택될 수 있으며, 울트라 커패시터가 채택될 수도 있다. 상기 고전압 전원(210)은 비절연 양방향 DC-DC 컨버터(200)가 구동되면, DC-DC 컨버터 유닛(230)과 전기적으로 연결되어 고전압을 사용하는 부하 장치로 전원을 인가하거나 저전압 전원(220)을 충전시킨다.The high voltage power supply 210 is a power supply device having a higher voltage than the low voltage power supply 220 and capable of charging and discharging. A 48V battery may be adopted, and an ultracapacitor may be adopted. When the non-isolated bidirectional DC-DC converter 200 is driven, the high voltage power supply 210 is electrically connected to the DC-DC converter unit 230 to supply power to a load device using a high voltage or low voltage power supply 220. Charge it.
저전압 전원(220)은 고전압 전원(210)보다 낮은 전압을 가지며 충방전이 가능한 전원 장치로서, 12V 배터리 또는 24V 배터리가 채택될 수 있다. 상기 저전압 전원(220)은 비절연 양방향 DC-DC 컨버터(200)가 구동되면, 저전압을 사용하는 부하 장치로 전원을 인가하거나 고전압 전원(210)을 충전시킨다.The low voltage power supply 220 may have a lower voltage than the high voltage power supply 210 and may be charged or discharged. A 12V battery or a 24V battery may be adopted. When the non-isolated bidirectional DC-DC converter 200 is driven, the low voltage power supply 220 applies power to the load device using the low voltage or charges the high voltage power 210.
커패시터(240)는 저전압 전원(220)에 병렬 연결되며, 출력 평활용 커패시터가 사용될 수 있다. The capacitor 240 is connected in parallel to the low voltage power supply 220, an output smoothing capacitor may be used.
DC-DC 컨버터 유닛(230)은 스위칭 신호에 따라, 부스트 모드(boost mode) 또는 벅 모드(buck mode)로 동작한다. 즉, DC-DC 컨버터 유닛(230)은 스위칭 신호에 의해서, 저전압 전원(220)의 전류를 고전압 전원(210)으로 이동시키는 부스트 모드로 동작하거나, 고전압 전원(210)의 전류를 저전압 전원(220)으로 이동시키는 벅 모드로 동작한다.The DC-DC converter unit 230 operates in a boost mode or a buck mode according to the switching signal. That is, the DC-DC converter unit 230 operates in a boost mode for moving the current of the low voltage power supply 220 to the high voltage power supply 210 by the switching signal, or converts the current of the high voltage power supply 210 to the low voltage power supply 220. It works in buck mode.
상기 DC-DC 컨버터 유닛(230)은 전류가 흐를 때 에너지를 축적하는 인덕터(233), 서로 상보적으로 동작하는 한 쌍의 스위치(231, 232)를 포함한다.The DC-DC converter unit 230 includes an inductor 233 that accumulates energy when a current flows, and a pair of switches 231 and 232 that complementarily operate with each other.
DC-DC 컨버터 유닛(230)에 포함된 한 쌍의 스위치(231, 232)(Qc, Qd)는 고전압 스위치(231)(Qc)와 저전압 스위치(232)(Qd)로 구분되며, 각 스위치(231, 232)는 스위칭 신호(S3, S4)에 따라 턴온(turn on)되거나 턴오프(turn off)된다. 각 스위치(231, 232, 251, 252)는 스위치 제어 모듈(도면에 도시되지 않음)에서 생성된 스위칭 신호인 PWM(Pulse Width Modulation)에 근거하여 턴온되거나 턴오프된다. 특히, 저전압 스위치(232)(Qd)와 고전압 스위치(231)(Qc)는 서로 상보적으로 동작한다. 즉, 저전압 스위치(232)(Qd)가 턴온되면 고전압 스위치(231)(Qc)는 턴오프되고, 또한 고전압 스위치(231)(Qc)가 턴온되면 저전압 스위치(232)(Qd)가 턴오프된다.The pair of switches 231 and 232 (Q c and Q d ) included in the DC-DC converter unit 230 are divided into a high voltage switch 231 (Q c ) and a low voltage switch 232 (Q d ). Each switch 231 and 232 is turned on or turned off according to the switching signals S 3 and S 4 . Each switch 231, 232, 251, and 252 is turned on or off based on a pulse width modulation (PWM) which is a switching signal generated by a switch control module (not shown in the figure). In particular, the low voltage switch 232 (Q d ) and the high voltage switch 231 (Q c ) operate complementary to each other. That is, when the low voltage switch 232 (Q d ) is turned on, the high voltage switch 231 (Q c ) is turned off, and when the high voltage switch 231 (Q c ) is turned on, the low voltage switch 232 (Q d ) is turned on. Is turned off.
저전압 전원(220)에서 고전압 전원(210)으로 전류가 이동될 때, 저전압 스위치(232)(Qd)가 메인 스위치로서 작동하고, 반대로 고전압 전원(210)에서 저전압 전원(220)으로 전류가 이동될 때, 고전압 스위치(231)(Qc)가 메인 스위치로 작동한다. 바람직하게, 각각의 스위치(231, 232, 251, 252)는 반도체 스위치로서 MOSFET(Metal Oxide Semiconductor Field Effect) 스위치가 이용될 수 있다. 또한, 저전압 스위치(232)(Qd)는 접지될 수 있다.When the current is moved from the low voltage power supply 220 to the high voltage power supply 210, the low voltage switch 232 (Q d ) operates as the main switch, and conversely, the current moves from the high voltage power supply 210 to the low voltage power supply 220. Is turned on, the high voltage switch 231 (Q c ) acts as the main switch. Preferably, each switch 231, 232, 251, and 252 may use a metal oxide semiconductor field effect (MOSFET) switch as a semiconductor switch. In addition, the low voltage switch 232 (Q d ) may be grounded.
상기 인덕터(233)와 상기 고전압 스위치(231)(Qc) 상의 선로에는 분기점인 제1 노드(N1)가 형성되고, 고전압 전원(210)의 음극과 저전압 전원(220)의 음극이 연결되는 선로에는 분기점인 제2 노드(N2)가 형성된다. 상기 고전압 스위치(231)(Qc)의 드레인은 고전압 전원(210)의 양극과 연결되고, 상기 고전압 스위치(231)(Qc)의 소스는 제1 노드(N1)와 연결된다. 또한, 저전압 스위치(232)(Qd)의 소스는 제2 노드(N2)와 연결되고 저전압 스위치(232)(Qd)의 드레인은 제2 보호 스위치(252)(Qb)의 드레인과 연결된다.A first node N 1 , which is a branching point, is formed on a line on the inductor 233 and the high voltage switch 231 (Q c ), and the cathode of the high voltage power supply 210 and the cathode of the low voltage power supply 220 are connected to each other. The second node N 2 , which is a branch point, is formed on the track. A drain of the high voltage switch 231 (Q c ) is connected to the positive electrode of the high voltage power supply 210, and a source of the high voltage switch 231 (Q c ) is connected to the first node N 1 . The source of low-voltage switch (232) (Q d) to the second drain node connected to the (N2) and the low-voltage switch (232) (Q d) is connected to the drain of the second protection switch (252) (Q b) do.
하나의 게이트 전원(Vg)을 통해서, 고전압 스위치(231)(Qc), 제1 보호 스위치(251)(Qa), 제2 보호 스위치(252)(Qb)의 게이트에 전원이 공급된다. 부연하면, 본 발명의 일 실시예에 따른 양방향 비절연 DC-DC 컨버터(200)에 포함된 고전압 스위치(231)(Qc), 제1 보호 스위치(251)(Qa) 및 제2 보호 스위치(252)(Qb)의 기준 전위가 동일함에 따라, 하나의 게이트 전원(Vg)을 통해서 고전압 스위치(231)(Qc), 제1 보호 스위치(251)(Qa) 및 제2 보호 스위치(252)(Qb)에 게이트 전원 공급이 가능하다. 한편, 저전압 스위치(232)(Qd)에는 별도의 게이트 전원(도면에 도시되지 않음)을 통해 게이트 전원이 공급될 수 있다.Power is supplied to the gates of the high voltage switch 231 (Q c ), the first protection switch 251 (Q a ), and the second protection switch 252 (Q b ) through one gate power supply V g . do. In other words, the high voltage switch 231 (Q c ), the first protection switch 251 (Q a ), and the second protection switch included in the bidirectional non-isolated DC-DC converter 200 according to an embodiment of the present invention. As the reference potential of (252) (Q b ) is the same, the high voltage switch 231 (Q c ), the first protection switch 251 (Q a ), and the second protection through one gate power supply V g The gate power can be supplied to the switch 252 (Q b ). On the other hand, the gate voltage may be supplied to the low voltage switch 232 (Q d ) through a separate gate power (not shown).
한편, 본 발명의 일 실시예에 따른 비절연 양방향 DC-DC 컨버터(200)는 제1 보호 스위치(251)(Qa)가 인덕터(233)와 제1 노드(N1) 사이에 배치되어 백투백(back-to-back) 스위치의 기능을 수행하고, 제2 보호 스위치(252)(Qb)가 저전압 스위치(232)(Qd)와 제1 노드(N1) 사이에 배치되어 백투백 스위치의 기능을 수행한다.Meanwhile, in the non-isolated bidirectional DC-DC converter 200 according to an embodiment of the present invention, a first protection switch 251 Q a is disposed between the inductor 233 and the first node N 1 to back-to-back. and a second protection switch 252 (Q b ) is disposed between the low voltage switch 232 (Q d ) and the first node N 1 to perform the function of a back-to-back switch. Perform the function.
구체적으로, 제1 보호 스위치(251)(Qa)의 드레인이 인덕터(233)와 직렬 연결되며, 제1 보호 스위치(251)(Qa)의 소스가 제1 노드(N1)와 연결되고, 이러한 연결 구조에 따라 고전압 전원(210)과 저전압 전원(220) 사이에서 고전압 스위치(231)(Qc)와 제1 보호 스위치(251)(Qa)가 백투백 스위치의 기능을 수행하여, 상기 고전압 전원(210)과 저전압 전원(220) 사이에서 단락으로 인해 발생하는 비정상적인 전류 흐름을 차단하고, 오결선으로 인해서 발생할 수 있는 역극성 전류를 차단한다.In detail, the drain of the first protection switch 251 (Q a ) is connected in series with the inductor 233, and the source of the first protection switch 251 (Q a ) is connected with the first node N 1 . According to the connection structure, the high voltage switch 231 (Q c ) and the first protection switch 251 (Q a ) between the high voltage power supply 210 and the low voltage power supply 220 perform a function of a back-to-back switch. Blocks abnormal current flow caused by a short circuit between the high voltage power supply 210 and the low voltage power supply 220, and blocks reverse polarity current that may occur due to a miswiring.
또한, 제2 보호 스위치(252)(Qb)의 드레인이 저전압 스위치(232)(Qd)의 드레인과 연결되며, 제2 보호 스위치(252)(Qb)의 소스가 제1 노드(N1)와 연결되고, 이러한 연결 구조에 따라 상기 제2 보호 스위치(252)(Qb)와 저전압 스위치(232)(Qd)가 전원(210, 220)과 그라운드(GND) 사이에서 백투백 스위치의 기능을 수행한다. 즉, 상기 제2 보호 스위치(252)(Qb)와 저전압 스위치(232)(Qd)가 고전압 전원(210) 또는 저전압 전원(220)과 그라운드(GND) 사이에 단락(short)으로 인해 발생하는 비정상적인 전류 흐름을 차단하고, 오결선으로 인해서 발생하는 역극성 전류의 흐름을 차단하여, 단락 및 역극성으로부터 시스템을 보호한다.In addition, the drain of the second protection switch 252 (Q b ) is connected to the drain of the low voltage switch 232 (Q d ), and the source of the second protection switch 252 (Q b ) is the first node N1. And the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ) function as a back-to-back switch between the power supplies 210 and 220 and ground (GND) according to the connection structure. Do this. That is, the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ) are generated due to a short between the high voltage power source 210 or the low voltage power source 220 and the ground GND. This protects the system from short circuit and reverse polarity by blocking abnormal current flow and blocking the reverse polarity current caused by incorrect wiring.
한편, 비절연 양방향 DC-DC 컨버터(200)가 구동되면, 제1 보호 스위치(251)(Qa) 및 제2 보호 스위치(252)(Qb)를 턴온시키는 스위칭 신호(S1, S2)가 스위칭 제어 모듈(도면에 도시되지 않음)에서 계속적으로 발생될 수 있다. 또한, 고전압 스위치(231)(Qc), 저전압 스위치(232)(Qd) 중 어느 하나를 턴온시키는 스위칭 신호가 스위칭 제어 모듈에서 발생될 수도 있다. 즉, 스위치 제어 모듈은 비절연 양방향 DC-DC 컨버터(200)가 구동되면, 제1 보호 스위치(251)(Qa)와 제2 보호 스위치(252)(Qb) 모두를 턴온시키는 스위칭 신호를 발생시킨 상태에서, 동작 모드(즉, 부스트 모드 또는 벅 모드)에 근거하여 고전압 스위치(231)(Qc), 저전압 스위치(232)(Qd) 중 어느 하나를 턴온시키는 신호를 발생시킬 수 있다.Meanwhile, when the non-isolated bidirectional DC-DC converter 200 is driven, the switching signals S 1 and S 2 which turn on the first protection switch 251 (Q a ) and the second protection switch 252 (Q b ). ) May be generated continuously in the switching control module (not shown in the figure). In addition, a switching signal for turning on any one of the high voltage switch 231 (Q c ) and the low voltage switch 232 (Q d ) may be generated in the switching control module. That is, when the non-isolated bidirectional DC-DC converter 200 is driven, the switch control module supplies a switching signal for turning on both the first protection switch 251 (Q a ) and the second protection switch 252 (Q b ). In the generated state, a signal for turning on any one of the high voltage switch 231 (Q c ) and the low voltage switch 232 (Q d ) based on the operation mode (ie, the boost mode or the buck mode) may be generated. .
보호 스위치(251, 252)를 포함하는 비절연 양방향 DC-DC 컨버터(200)는 제1 보호 스위치(251)(Qa)와 고전압 스위치(252)(Qc)를 통해, 고전압 전원(210)과 저전압 전원(220) 사이에서 발생할 수 있는 의도치 않은 비정상적인 전류(예컨대, 역극성 전류, 과도 전류 등)를 차단할 수 있다. 또한, 고전압 전원(210) 또는 저전압 전원(220)과 그라운드(GND) 사이에서 발생하는 의도치 않은 전류 흐름은, 제2 보호 스위치(252)(Qb)와 저전압 스위치(232)(Qd)를 통해서 차단된다. The non-isolated bidirectional DC-DC converter 200 including the protection switches 251 and 252 is connected to the high voltage power supply 210 through the first protection switch 251 (Q a ) and the high voltage switch 252 (Q c ). It is possible to block unintended abnormal currents (eg, reverse polarity currents, transients, etc.) that may occur between and the low voltage power supply 220. In addition, the unintended current flow occurring between the high voltage power source 210 or the low voltage power source 220 and the ground GND may include the second protection switch 252 (Q b ) and the low voltage switch 232 (Q d ). It is blocked through.
상술한 바와 같이, 본 발명의 실시예에 따른 보호 스위치가 포함된 비절연 양방향 DC-DC 컨버터(200)는, 종래의 비절연 양방향 DC-DC 컨버터(100)보다 스위치 개수가 감소되어, 원가 절감과 소형화가 용이한 효과가 있다, 또한, 본 발명의 실시예에 따른 비절연 양방향 DC-DC 컨버터(200)는, 종래의 비절연 양방향 DC-DC 컨버터(100)와 비교하여 스위치 개수를 감소시켜, 이에 따라 각 스위치의 개수에 비례하여 발생하는 시스템 손실을 최소화함으로써, 컨버터의 효율이 향상시킨다. 게다가, 본 발명의 실시예에 따른 비절연 양방향 DC-DC 컨버터(200)는, 하나의 게이트 전원(Vg)을 이용하여 세 개의 스위치(231, 251, 252)로 전원을 공급하여 게이트 전원의 개수를 줄임으로써, 제품 소형화에 매우 적합하다.As described above, in the non-isolated bidirectional DC-DC converter 200 including the protection switch according to the embodiment of the present invention, the number of switches is reduced compared to the conventional non-isolated bidirectional DC-DC converter 100, thereby reducing the cost. In addition, the non-isolated bidirectional DC-DC converter 200 according to the embodiment of the present invention reduces the number of switches compared to the conventional non-isolated bidirectional DC-DC converter 100. Accordingly, the efficiency of the converter is improved by minimizing the system loss occurring in proportion to the number of each switch. In addition, the non-isolated bidirectional DC-DC converter 200 according to the embodiment of the present invention supplies power to the three switches 231, 251, and 252 using one gate power supply V g to provide the power supply. By reducing the number, it is very suitable for product miniaturization.
한편, 상술한 실시예에서, 비절연 양방향 DC-DC 컨버터(200)는 단일의 DC-DC 컨버터 유닛(230)을 포함하는 것으로 설명하였지만, 본 발명은 이에 한정되지 않고, 복수의 DC-DC 컨버터 유닛(230)을 포함하는 멀티페이즈형 비절연 양방향 DC-DC 컨버터에 적용될 수 있음을 분명히 해 둔다.Meanwhile, in the above-described embodiment, the non-isolated bidirectional DC-DC converter 200 has been described as including a single DC-DC converter unit 230, but the present invention is not limited thereto, and the plurality of DC-DC converters is described. It is clear that the present invention can be applied to a multiphase non-isolated bidirectional DC-DC converter including the unit 230.
이상에서 설명한 본 발명은, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 변형 및 변경이 가능하므로 전술한 실시예 및 첨부된 도면에 의해 한정되는 것이 아니다.The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

Claims (4)

  1. 고전압 전원과 저전압 전원 사이에서 양방향 전압 변환을 수행하며, 보호 스위치를 포함하는 비절연 양방향 DC-DC 컨버터에 있어서,A non-isolated bidirectional DC-DC converter which performs bidirectional voltage conversion between a high voltage power supply and a low voltage power supply, and includes a protection switch,
    스위칭 신호에 응답하여 부스트 모드 또는 벅 모드로 스위칭되는 한 쌍의 스위칭 소자인 고전압 스위치와 저전압 스위치, 상기 고전압 스위치와 상기 저전압 스위치와 연결되는 인덕터를 포함하는 DC-DC 컨버터 유닛;A DC-DC converter unit including a high voltage switch and a low voltage switch, which are a pair of switching elements switched in a boost mode or a buck mode in response to a switching signal, and an inductor connected to the high voltage switch and the low voltage switch;
    상기 DC-DC 컨버터 유닛의 인덕터와 고전압 스위치 사이에 배치되어 상기 고전압 스위치와 함께 백투백 스위치 기능을 수행하는 제1 보호 스위치; 및A first protection switch disposed between the inductor and the high voltage switch of the DC-DC converter unit to perform a back-to-back switch function together with the high voltage switch; And
    상기 제1 보호 스위치와 상기 고전압 스위치 간의 선로 간에 형성된 노드와 상기 저전압 스위치 사이에 배치되어 상기 저전압 스위치와 함께 백투백 스위치 기능을 수행하는 제2 보호 스위치;를 포함하는 양방향 비절연 DC-DC 컨버터.And a second protection switch disposed between a node formed between a line between the first protection switch and the high voltage switch and the low voltage switch to perform a back-to-back switch function together with the low voltage switch.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 제1 보호 스위치와 상기 고전압 스위치는 백투백 스위치로 동작하여 상기 고전압 전원과 상기 저전압 전원 사이에서 발생하는 비정상적인 전류를 차단하는 것을 특징으로 하는 양방향 비절연 DC-DC 컨버터.And the first protection switch and the high voltage switch act as a back-to-back switch to cut off abnormal current generated between the high voltage power source and the low voltage power source.
  3. 제 1 항에 있어서,The method of claim 1,
    상기 제2 보호 스위치와 상기 저전압 스위치는 백투백 스위치로 동작하여, 상기 고전압 전원 또는 상기 저전압 전원과 상기 저전압 스위치에서 접지된 그라운드 사이에서 발생하는 비정상적인 전류를 차단하는 것을 특징으로 하는 양방향 비절연 DC-DC 컨버터.The second protection switch and the low voltage switch operate as a back-to-back switch to block abnormal current generated between the high voltage power source or the low voltage power source and the ground grounded in the low voltage switch. Converter.
  4. 제 1 항에 있어서,The method of claim 1,
    상기 스위치는, 반도체 스위치이고, The switch is a semiconductor switch,
    상기 제1 보호 스위치의 소스가 상기 노드와 연결되고, 상기 제1 보호 스위치의 드레인이 상기 인덕터와 연결되며, A source of the first protection switch is connected with the node, a drain of the first protection switch is connected with the inductor,
    상기 제2 보호 스위치의 소스가 상기 노드와 연결되고, 상기 제2 보호 스위치의 드레인이 상기 저전압 스위치의 드레인과 연결되며,A source of the second protection switch is connected with the node, a drain of the second protection switch is connected with a drain of the low voltage switch,
    하나의 게이트 전원을 통해서, 상기 고전압 스위치의 게이트, 상기 제1 보호 스위치의 게이트 및 상기 제2 보호 스위치의 게이트에 전원이 공급되는 것을 특징으로 하는 양방향 비절연 DC-DC 컨버터.The bidirectional non-isolated DC-DC converter characterized in that power is supplied to a gate of the high voltage switch, a gate of the first protection switch, and a gate of the second protection switch through one gate power source.
PCT/KR2015/011995 2015-10-30 2015-11-09 Bidirectional non-isolated dc-dc converter having improved stability WO2017073829A1 (en)

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