KR20070020695A - Inrush current preventing device of a HEV - Google Patents

Inrush current preventing device of a HEV Download PDF

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KR20070020695A
KR20070020695A KR1020050074881A KR20050074881A KR20070020695A KR 20070020695 A KR20070020695 A KR 20070020695A KR 1020050074881 A KR1020050074881 A KR 1020050074881A KR 20050074881 A KR20050074881 A KR 20050074881A KR 20070020695 A KR20070020695 A KR 20070020695A
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South Korea
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voltage battery
high voltage
main relay
link capacitor
inverter
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KR1020050074881A
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Korean (ko)
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KR101072190B1 (en
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송병섭
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현대자동차주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/16—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with provision for separate direct mechanical propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/12—Buck converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

본 발명에 따른 하이브리드 전기 자동차의 돌입전류 방지장치는, 고전압의 전원이 저장되는 고전압배터리와, 상기 고전압배터리에서 출력된 직류를 교류로 변환하여 모터/제너레이터로 전달하거나 상기 모터/제너레이터에서 생성된 교류를 직류로 변환하여 상기 고전압배터리로 전달하는 인버터와, 상기 고전압배터리와 인버터를 전기적으로 연결하거나 차단하기 위한 메인릴레이와, 상기 인버터의 앞단에 병렬로 연결되어 있는 직류 링크 캐패시터와, 저전압배터리와, 상기 저전압배터리를 충전하거나 상기 저전압배터리의 전압을 승압하여 고전압배터리측으로 공급하도록 상기 메인릴레이와 직류 링크 캐패시터 사이에 연결되어 있는 양방향 DC-DC 컨버터와, 상기 양방향 DC-DC 컨버터를 작동시켜서 상기 직류 링크 캐패시터를 충전시킨 다음 상기 메인릴레이를 접속시키는 제어기를 포함하여 구성되어, 메인릴레이 접속시의 초기 돌입전류를 제한하여 회로의 안정성을 확보할 수 있다.Inrush current prevention device of a hybrid electric vehicle according to the present invention, a high voltage battery in which a high voltage power is stored, and the direct current output from the high voltage battery is converted into an alternating current and transferred to a motor / generator or generated in the motor / generator An inverter for converting a direct current into a high voltage battery, a main relay for electrically connecting or disconnecting the high voltage battery and an inverter, a direct current link capacitor connected in parallel to the front end of the inverter, a low voltage battery, A bidirectional DC-DC converter connected between the main relay and a DC link capacitor to charge the low voltage battery or to boost the voltage of the low voltage battery to supply the high voltage battery, and operate the bidirectional DC-DC converter to operate the DC link. After charging the capacitor It is a controller for connecting the relay to limit the initial inrush current when the main relay may be connected to ensure the stability of the circuit.

Description

하이브리드 전기 자동차의 돌입전류 방지장치 {Inrush current preventing device of a HEV}Inrush current preventing device of hybrid electric vehicle

도 1은 본 발명에 따른 하이브리드 전기 자동차의 돌입전류 방지장치의 회로도이다.1 is a circuit diagram of a device for preventing inrush current of a hybrid electric vehicle according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1 : 고전압배터리 2 : 메인릴레이1: high voltage battery 2: main relay

3 : 제어기 4 : 인버터3: controller 4: inverter

5 : 직류 링크 캐패시터 6 : 모터/제너레이터5: DC link capacitor 6: motor / generator

7 : 양방향 DC-DC 컨버터 8 : 저전압배터리7 bidirectional DC-DC converter 8 low voltage battery

9 : 제1전압센서 10 : 제2전압센서9: first voltage sensor 10: second voltage sensor

본 발명은 하이브리드 전기 자동차에 관한 것으로, 좀더 상세하게는 메인 릴레이를 접속하기 전에 직류 링크 캐패시터를 프리챠지(pre-charge)시키는 장치에 관한 것이다.The present invention relates to a hybrid electric vehicle, and more particularly, to an apparatus for precharging a DC link capacitor before connecting the main relay.

최근 들어, 친환경적인 자동차로서 하이브리드 전기자동차가 개발되어 사용되고 있다. 이와 같은 하이브리드 전기자동차는 동력원으로서 내연기관과 배터리를 복합적으로 사용하고 있는데, 통상 시동 및 출발시에는 전기모터만을 이용하여 주행시키고, 일반 주행시에는 전기모터와 내연기관을 연동시켜서 주행시킨다.Recently, hybrid electric vehicles have been developed and used as eco-friendly vehicles. Such a hybrid electric vehicle uses a combination of an internal combustion engine and a battery as a power source. In general, a hybrid electric vehicle runs by using only an electric motor at start and start, and runs in conjunction with an electric motor and an internal combustion engine during normal driving.

상기 전기모터를 이용하여 자동차를 주행시킬 때는 배터리의 전원이 메인 릴레이와 직류 링크 캐패시터를 통해 인버터로 공급되고, 상기 인버터의 작동에 의해 직류가 교류로 전환되어 모터/제너레이터를 작동시킨다.When the vehicle is driven using the electric motor, the battery power is supplied to the inverter through the main relay and the DC link capacitor, and the DC is converted into AC by the operation of the inverter to operate the motor / generator.

그러나, 상기 직류 링크 캐패시터가 충전이 되지 않은 상태에서 메인릴레이가 접속되면 초기 돌입전류가 급격히 흘러서 회로의 각 소자들에 치명적인 손상을 일으키게 된다.However, if the main relay is connected while the DC link capacitor is not charged, initial inrush current flows rapidly, causing serious damage to the elements of the circuit.

예를 들어, 직류 링크 캐패시터 용량이 1400uF일 때, 42V가 인가되면 초기 돌입전류가 500A 이상 흐르게 되어 회로에 손상을 일으키므로, 이에 대한 적절한 조치가 요구되고 있다.For example, when a DC link capacitor has a capacity of 1400 uF, when 42 V is applied, an initial inrush current flows more than 500 A, causing damage to the circuit. Therefore, appropriate measures are required.

이에, 본 발명은 메인릴레이 접속하기 전에 DC-DC 컨버터를 이용하여 직류 링크 캐패시터를 충전시킴으로써, 메인릴레이 접속시의 초기 돌입전류를 제한하여 회로의 안정성을 확보하는 하이브리드 전기 자동차의 돌입전류 방지장치를 제공하는데 그 목적이 있다.Accordingly, the present invention provides a device for preventing inrush current of a hybrid electric vehicle, which secures circuit stability by limiting initial inrush current when the main relay is connected by charging a DC link capacitor using a DC-DC converter before connecting the main relay. The purpose is to provide.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 하이브리드 전기 자동차의 돌입전류 방지장치는, 고전압의 전원이 저장되는 고전압배터리와, 상기 고전압배터리에서 출력된 직류를 교류로 변환하여 모터/제너레이터로 전달하거나 상기 모터/제너레이터에서 생성된 교류를 직류로 변환하여 상기 고전압배터리로 전달하는 인버터와, 상기 고전압배터리와 인버터를 전기적으로 연결하거나 차단하기 위한 메인릴레이와, 상기 인버터의 앞단에 병렬로 연결되어 있는 직류 링크 캐패시터와, 저전압배터리와, 상기 저전압배터리를 충전하거나 상기 저전압배터리의 전압을 승압하여 고전압배터리측으로 공급하도록 상기 메인릴레이와 직류 링크 캐패시터 사이에 연결되어 있는 양방향 DC-DC 컨버터와, 상기 양방향 DC-DC 컨버터를 작동시켜서 상기 직류 링크 캐패시터를 충전시킨 다음 상기 메인릴레이를 접속시키는 제어기를 포함하여 구성된 것을 특징으로 한다.Inrush current prevention device of a hybrid electric vehicle according to the present invention for achieving the object as described above, the high voltage battery is stored a high voltage power, and converts the direct current output from the high voltage battery to an alternating current and transferred to the motor / generator Or an inverter converting alternating current generated by the motor / generator into direct current and transferring the alternating current to the high voltage battery, a main relay for electrically connecting or disconnecting the high voltage battery and the inverter, and connected in parallel to the front end of the inverter. A bidirectional DC-DC converter connected between the main relay and the DC link capacitor to supply a DC link capacitor, a low voltage battery, the low voltage battery, or boost the voltage of the low voltage battery and supply the voltage to the high voltage battery; The DC converter to operate the direct current And a controller for charging the link capacitor and then connecting the main relay.

또한, 상기 고전압배터리의 전압을 감지하는 제1전압센서와, 상기 직류 링크 캐패시터의 전압을 감지하는 제2전압센서를 더 포함하는 한편, 상기 제어기는 상기 고전압배터리와 직류 링크 캐패시터의 전압차가 일정값 이하로 되면 메인릴레이를 접속시키도록 되어 있는 것을 특징으로 한다.The controller may further include a first voltage sensor that senses the voltage of the high voltage battery and a second voltage sensor that senses the voltage of the DC link capacitor, and wherein the controller has a constant voltage difference between the high voltage battery and the DC link capacitor. The main relay is characterized in that the main relay is connected as follows.

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 하이브리드 전기 자동차의 돌입전류 방지장치의 회로도이다.1 is a circuit diagram of a device for preventing inrush current of a hybrid electric vehicle according to the present invention.

상기 도 1에 도시된 바와 같이, 고전압배터리(1)는 고전압의 전원이 저장되며, 메인릴레이(2)는 제어기(3)의 제어에 따라 고전압배터리(1)와 인버터(4)를 전기적으로 연결하거나 차단하도록 되어 있다.As shown in FIG. 1, the high voltage battery 1 stores high voltage power, and the main relay 2 electrically connects the high voltage battery 1 and the inverter 4 under the control of the controller 3. Or to block.

상기 인버터(4)의 앞단에는 직류 링크 캐패시터(5)가 병렬로 연결되어 있고, 상기 인버터(4)는 상기 제어기(3)의 제어에 따라 동작하여 상기 고전압배터리(1)에서 출력된 직류를 교류로 변환하여 모터/제너레이터(6)로 전달하거나 상기 모터/제너레이터(6)에서 생성된 교류를 직류로 변환하여 상기 고전압배터리(1)로 전달하도록 되어 있다.DC link capacitors 5 are connected to the front end of the inverter 4 in parallel, and the inverter 4 operates under the control of the controller 3 to exchange direct current output from the high voltage battery 1. Is converted to the motor / generator 6, or the alternating current generated by the motor / generator 6 is converted into direct current and transferred to the high voltage battery 1.

그리고, 양방향 DC-DC 컨버터(7)는 제어기(3)의 제어에 따라 동작하여 저전압배터리(8)를 충전하거나 상기 저전압배터리(8)의 전압을 승압하여 고전압배터리(1)측으로 공급하도록 상기 메인릴레이(2)와 직류 링크 캐패시터(5) 사이에 연결되어 있다.Then, the bidirectional DC-DC converter 7 operates under the control of the controller 3 to charge the low voltage battery 8 or to boost the voltage of the low voltage battery 8 to supply the high voltage battery 1 to the side. It is connected between the relay 2 and the direct current link capacitor 5.

또한, 제1전압센서(9)는 상기 고전압배터리(1)의 전압을 감지하여 제어기(3)로 입력하도록 되어 있고, 제2전압센서(10)는 상기 직류 링크 캐패시터(5)의 전압을 감지하여 제어기(3)로 입력하도록 되어 있고, 상기 제어기(3)는 메인릴레이(2)의 접속시 상기 양방향 DC-DC 컨버터(7)를 작동시켜서 상기 직류 링크 캐패시터(5)를 먼저 충전시킨 다음 상기 제1전압센서(9) 및 제2전압센서(10)에 의해 감지된 상기 고전압배터리(1)와 직류 링크 캐패시터(4)의 전압차가 일정값 이하로 되면 메인릴레이(2)를 접속시키도록 되어 있다.In addition, the first voltage sensor 9 detects the voltage of the high voltage battery 1 and inputs it to the controller 3, and the second voltage sensor 10 senses the voltage of the DC link capacitor 5. The controller 3 operates the bidirectional DC-DC converter 7 when the main relay 2 is connected to charge the DC link capacitor 5 first, and then the When the voltage difference between the high voltage battery 1 and the DC link capacitor 4 detected by the first voltage sensor 9 and the second voltage sensor 10 becomes less than a predetermined value, the main relay 2 is connected. have.

상기와 같이 구성된 본 발명에 따른 하이브리드 전기 자동차의 돌입전류 방 지장치의 작용 및 효과를 상세히 설명하면 다음과 같다.Referring to the operation and effects of the inrush current blocking device of the hybrid electric vehicle according to the present invention configured as described above are as follows.

제어기(3)가 상기 인버터(4)를 동작시켜서 고전압배터리(1)에서 출력된 직류를 교류로 변환하여 모터/제너레이터(6)로 전달하거나 상기 모터/제너레이터(6)에서 생성된 교류를 직류로 변환하여 상기 고전압배터리(1)로 전달하기 위해서는 메인릴레이(2)를 접속시켜야 한다.The controller 3 operates the inverter 4 to convert a direct current output from the high voltage battery 1 into an alternating current and transmits the alternating current to the motor / generator 6 or converts the alternating current generated by the motor / generator 6 into a direct current. In order to convert and transfer the high voltage battery 1, the main relay 2 must be connected.

이때, 상기 제어기(3)는 메인릴레이(2)를 접속시키기 전에 양방향 DC-DC 컨버터(7)를 작동시켜서 도 1에 화살표로 표시된 바와 같이 직류 링크 캐패시터(5)를 먼저 충전시킨 다음 제1전압센서(9) 및 제2전압센서(10)에 의해 감지된 상기 고전압배터리(1)와 직류 링크 캐패시터(4)의 전압차가 일정값 이하로 되면 메인릴레이(2)를 접속시킨다.At this time, the controller 3 operates the bidirectional DC-DC converter 7 before connecting the main relay 2 to charge the DC link capacitor 5 first as indicated by the arrow in FIG. When the voltage difference between the high voltage battery 1 and the DC link capacitor 4 detected by the sensor 9 and the second voltage sensor 10 becomes less than a predetermined value, the main relay 2 is connected.

즉, 상기 양방향 DC-DC 컨버터(7)는 전류제한 기능이 있어 일정 전류 이상의 출력을 내는 것을 막아 주는 기능 있으므로, 이러한 기능을 이용하여 직류 링크 캐패시터(5)를 먼저 충전시킨 다음 메인릴레이(2)를 접속시켜서 돌입전류를 방지하는 것이다.That is, since the bidirectional DC-DC converter 7 has a current limiting function to prevent the output of a predetermined current or more, the DC link capacitor 5 is first charged using the function, and then the main relay 2 To prevent inrush current.

이상에서 설명한 바와 같이 본 발명에 따르면, 메인릴레이 접속하기 전에 DC-DC 컨버터를 이용하여 직류 링크 캐패시터를 충전시킴으로써, 메인릴레이 접속시의 초기 돌입전류를 제한하여 회로의 안정성을 확보하는 효과가 있다.As described above, according to the present invention, the DC link capacitor is charged using the DC-DC converter before the main relay connection, thereby limiting the initial inrush current during the main relay connection, thereby securing the stability of the circuit.

Claims (2)

고전압의 전원이 저장되는 고전압배터리와, 상기 고전압배터리에서 출력된 직류를 교류로 변환하여 모터/제너레이터로 전달하거나 상기 모터/제너레이터에서 생성된 교류를 직류로 변환하여 상기 고전압배터리로 전달하는 인버터와, 상기 고전압배터리와 인버터를 전기적으로 연결하거나 차단하기 위한 메인릴레이와, 상기 인버터의 앞단에 병렬로 연결되어 있는 직류 링크 캐패시터와, 저전압배터리와, 상기 저전압배터리를 충전하거나 상기 저전압배터리의 전압을 승압하여 고전압배터리측으로 공급하도록 상기 메인릴레이와 직류 링크 캐패시터 사이에 연결되어 있는 양방향 DC-DC 컨버터와, 상기 양방향 DC-DC 컨버터를 작동시켜서 상기 직류 링크 캐패시터를 충전시킨 다음 상기 메인릴레이를 접속시키는 제어기를 포함하여 구성된 하이브리드 전기 자동차의 돌입전류 방지장치.A high voltage battery in which high voltage power is stored, and an inverter converting direct current output from the high voltage battery into alternating current and transferring the alternating current generated from the motor / generator to direct current and converting the alternating current generated from the motor / generator into direct current; A main relay for electrically connecting or disconnecting the high voltage battery and the inverter, a DC link capacitor connected to the front end of the inverter in parallel, a low voltage battery, and the low voltage battery to charge or boost the voltage of the low voltage battery. A bidirectional DC-DC converter connected between the main relay and a DC link capacitor to supply a high voltage battery, and a controller configured to operate the bidirectional DC-DC converter to charge the DC link capacitor and then connect the main relay. Hybrid configuration The car inrush current protection. 제 1 항에 있어서, 상기 고전압배터리의 전압을 감지하는 제1전압센서와, 상기 직류 링크 캐패시터의 전압을 감지하는 제2전압센서를 더 포함하는 한편, 상기 제어기는 상기 고전압배터리와 직류 링크 캐패시터의 전압차가 일정값 이하로 되면 메인릴레이를 접속시키도록 되어 있는 것을 특징으로 하는 하이브리드 전기 자동차의 돌입전류 방지장치.The method of claim 1, further comprising: a first voltage sensor for sensing a voltage of the high voltage battery, and a second voltage sensor for sensing a voltage of the DC link capacitor, wherein the controller is configured to control the high voltage battery and the DC link capacitor. An inrush current preventing device for a hybrid electric vehicle, characterized in that the main relay is connected when the voltage difference is lower than a predetermined value.
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